SuperSeriousBusiness
/
GoToSocial
mirror of https://github.com/superseriousbusiness/gotosocial
1
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Code Issues Projects Releases Wiki Activity

Grand test fixup (#138) 

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig
This commit is contained in:
Tobi Smethurst 2021-08-12 21:03:24 +02:00 committed by GitHub
parent 329a5e8144
commit 98263a7de6
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2677 changed files with 1090869 additions and 219 deletions
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67
.drone.yml
View File

@ -1,18 +1,55 @@
---
### Drone configuration file for GoToSocial.
### Connects to https://drone.superseriousbusiness.org to perform testing, linting, and automatic builds/pushes to docker.
###
### For documentation on drone, see: https://docs.drone.io/
### For documentation on drone docker pipelines in particular: https://docs.drone.io/pipeline/docker/overview/
kind: pipeline
type: docker
name: dockerpublish
name: default
steps:
- name: publish image
image: plugins/docker
settings:
auto_tag: true
username:
from_secret: gts_docker_username
password:
from_secret: gts_docker_password
repo: superseriousbusiness/gotosocial
tags: latest
when:
event:
exclude:
- pull_request
# We use golangci-lint for linting.
# See: https://golangci-lint.run/
- name: lint
image: golangci/golangci-lint:v1.41.1
commands:
- golangci-lint run --timeout 5m0s --tests=false --verbose
- name: test
image: golang:1.16.4
environment:
GTS_DB_ADDRESS: postgres
commands:
# `-count 1` => run all tests at least once
# `-p 1` => run maximum one test at a time
# `./...` => run all tests
- go test -count 1 -p 1 ./...
- name: publish
image: plugins/docker
settings:
auto_tag: true
username: gotosocial
password:
from_secret: gts_docker_password
repo: superseriousbusiness/gotosocial
tags: latest
when:
event:
exclude:
- pull_request
services:
# We need this postgres service running for the test step.
# See: https://docs.drone.io/pipeline/docker/syntax/services/
- name: postgres
image: postgres
environment:
POSTGRES_PASSWORD: postgres
---
kind: signature
hmac: 78dd20d97444a9e2904552d56eb52f43ad30ba27e1d897a5ea6808971f9a0ae2
...

37
.github/workflows/golangci-lint.yml vendored
View File

@ -1,37 +0,0 @@
name: golangci-lint
on:
push:
tags:
- v*
branches:
- main
pull_request:
jobs:
golangci:
name: lint
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- name: golangci-lint
uses: golangci/golangci-lint-action@v2
with:
# Optional: version of golangci-lint to use in form of v1.2 or v1.2.3 or `latest` to use the latest version
version: v1.29
# Optional: working directory, useful for monorepos
# working-directory: somedir
# Optional: golangci-lint command line arguments.
# args: --issues-exit-code=0
# Optional: show only new issues if it's a pull request. The default value is `false`.
# only-new-issues: true
# Optional: if set to true then the action will use pre-installed Go.
# skip-go-installation: true
# Optional: if set to true then the action don't cache or restore ~/go/pkg.
# skip-pkg-cache: true
# Optional: if set to true then the action don't cache or restore ~/.cache/go-build.
# skip-build-cache: true

36
CONTRIBUTING.md
View File

@ -10,9 +10,7 @@ Check the [issues](https://github.com/superseriousbusiness/gotosocial/issues) to
## Communications
Before starting on something, please comment on an issue to say that you're working on it, and send a message to `@dumpsterqueer@ondergrond.org` (Mastodon) to let them know.
You can also drop into the GoToSocial Matrix room [here](https://matrix.to/#/!mdShFtfScQvVSmjIKX:ondergrond.org?via=ondergrond.org).
Before starting on something, please comment on an issue to say that you're working on it, and/or drop into the GoToSocial Matrix room [here](https://matrix.to/#/#gotosocial:superseriousbusiness.org).
This is the recommended way of keeping in touch with other developers, asking direct questions about code, and letting everyone know what you're up to.
@ -36,6 +34,38 @@ If there are no errors, great, you're good to go!
To work with the stylesheet for templates, you need [Node.js](https://nodejs.org/en/download/), then run `yarn install` in `web/source/`. Recompiling the bundle.css is `node build.js` but can be automated with [nodemon](https://www.npmjs.com/package/nodemon) on file change: `nodemon -w style.css build.js`.
### Golang forking quirks
One of the quirks of Golang is that it relies on the source management path being the same as the one used within `go.mod` and in package imports within individual Go files. This makes working with forks a bit awkward.
Let's say you fork GoToSocial to `github.com/yourgithubname/gotosocial`, and then clone that repository to `~/go/src/github.com/yourgithubname/gotosocial`. You will probably run into errors trying to run tests or build, so you might change your `go.mod` file so that the module is called `github.com/yourgithubname/gotosocial` instead of `github.com/superseriousbusiness/gotosocial`. But then this breaks all the imports within the project. Nightmare! So now you have to go through the source files and painstakingly replace `github.com/superseriousbusiness/gotosocial` with `github.com/yourgithubname/gotosocial`. This works OK, but when you decide to make a pull request against the original repo, all the changed paths are included! Argh!
The correct solution to this is to fork, then clone the upstream repository, then set `origin` of the upstream repository to that of your fork.
See [this blogpost](https://blog.sgmansfield.com/2016/06/working-with-forks-in-go/) for more details.
In case this post disappears, here are the steps (slightly modified):
>
> Pull the original package from the canonical place with the standard go get command:
>
> `go get github.com/superseriousbusiness/gotosocial`
>
> Fork the repository on Github or set up whatever other remote git repo you will be using. In this case, I would go to Github and fork the repository.
>
> Navigate to the top level of the repository on your computer. Note that this might not be the specific package you’re using:
>
> `cd $GOPATH/src/github.com/superseriousbusiness/gotosocial`
>
> Rename the current origin remote to upstream:
>
> `git remote rename origin upstream`
>
> Add your fork as origin:
>
> `git remote add origin git@github.com/yourgithubname/gotosocial`
>
## Setting up your test environment
GoToSocial provides a [testrig](https://github.com/superseriousbusiness/gotosocial/tree/main/testrig) with a bunch of mock packages you can use in integration tests.

3
Dockerfile
View File

@ -12,8 +12,11 @@ ADD cmd /go/src/github.com/superseriousbusiness/gotosocial/cmd
ADD internal /go/src/github.com/superseriousbusiness/gotosocial/internal
ADD testrig /go/src/github.com/superseriousbusiness/gotosocial/testrig
ADD docs/swagger.go /go/src/github.com/superseriousbusiness/gotosocial/docs/swagger.go
# dependencies and vendor
ADD go.mod /go/src/github.com/superseriousbusiness/gotosocial/go.mod
ADD go.sum /go/src/github.com/superseriousbusiness/gotosocial/go.sum
ADD vendor /go/src/github.com/superseriousbusiness/gotosocial/vendor
# move .git dir and version for versioning
ADD .git /go/src/github.com/superseriousbusiness/gotosocial/.git

4
README.md
View File

@ -107,6 +107,10 @@ Proper documentation for running and maintaining GoToSocial will be forthcoming
For now (if you want to run it pre-alpha, like a beast), check out the [quick and dirty getting started guide](https://docs.gotosocial.org/en/latest/installation_guide/quick_and_dirty/).
## Contributing
You wanna contribute to GtS? Great! ❤️❤️❤️ Check out the issues page to see if there's anything you wanna jump in on, and read the [CONTRIBUTING.md](./CONTRIBUTING.md) file for guidelines and setting up your dev environment.
## Contact
For questions and comments, you can [join our Matrix channel](https://matrix.to/#/#gotosocial:superseriousbusiness.org) at `#gotosocial:superseriousbusiness.org`. This is the quickest way to reach the devs. You can also mail [admin@gotosocial.org](mailto:admin@gotosocial.org).

2
internal/api/client/media/mediacreate_test.go
View File

@ -156,7 +156,7 @@ func (suite *MediaCreateTestSuite) TestStatusCreatePOSTImageHandlerSuccessful()
}
// check response
suite.EqualValues(http.StatusAccepted, recorder.Code)
suite.EqualValues(http.StatusOK, recorder.Code)
result := recorder.Result()
defer result.Body.Close()

20
internal/api/client/status/statuscreate_test.go
View File

@ -93,13 +93,13 @@ func (suite *StatusCreateTestSuite) TestPostNewStatus() {
ctx.Set(oauth.SessionAuthorizedAccount, suite.testAccounts["local_account_1"])
ctx.Request = httptest.NewRequest(http.MethodPost, fmt.Sprintf("http://localhost:8080/%s", status.BasePath), nil) // the endpoint we're hitting
ctx.Request.Form = url.Values{
"status": {"this is a brand new status! #helloworld"},
"spoiler_text": {"hello hello"},
"sensitive": {"true"},
"visibility_advanced": {"mutuals_only"},
"likeable": {"false"},
"replyable": {"false"},
"federated": {"false"},
"status": {"this is a brand new status! #helloworld"},
"spoiler_text": {"hello hello"},
"sensitive": {"true"},
"visibility": {string(model.VisibilityMutualsOnly)},
"likeable": {"false"},
"replyable": {"false"},
"federated": {"false"},
}
suite.statusModule.StatusCreatePOSTHandler(ctx)
@ -120,7 +120,7 @@ func (suite *StatusCreateTestSuite) TestPostNewStatus() {
assert.Equal(suite.T(), "hello hello", statusReply.SpoilerText)
assert.Equal(suite.T(), "<p>this is a brand new status! <a href=\"http://localhost:8080/tags/helloworld\" class=\"mention hashtag\" rel=\"tag nofollow noreferrer noopener\" target=\"_blank\">#<span>helloworld</span></a></p>", statusReply.Content)
assert.True(suite.T(), statusReply.Sensitive)
assert.Equal(suite.T(), model.VisibilityPrivate, statusReply.Visibility)
assert.Equal(suite.T(), model.VisibilityPrivate, statusReply.Visibility) // even though we set this status to mutuals only, it should serialize to private, because masto has no idea about mutuals_only
assert.Len(suite.T(), statusReply.Tags, 1)
assert.Equal(suite.T(), model.Tag{
Name: "helloworld",
@ -161,13 +161,11 @@ func (suite *StatusCreateTestSuite) TestPostAnotherNewStatus() {
b, err := ioutil.ReadAll(result.Body)
assert.NoError(suite.T(), err)
fmt.Println(string(b))
statusReply := &model.Status{}
err = json.Unmarshal(b, statusReply)
assert.NoError(suite.T(), err)
assert.Equal(suite.T(), "<p><a href=\"http://localhost:8080/tags/test\" class=\"mention hashtag\" rel=\"tag nofollow noreferrer noopener\" target=\"_blank\">#<span>test</span></a> alright, should be able to post <a href=\"http://localhost:8080/tags/links\" class=\"mention hashtag\" rel=\"tag nofollow noreferrer noopener\" target=\"_blank\">#<span>links</span></a> with fragments in them now, let&#39;s see........<br/><br/><a href=\"https://docs.gotosocial.org/en/latest/user_guide/posts/#links\" rel=\"noopener nofollow noreferrer\" target=\"_blank\">docs.gotosocial.org/en/latest/user_guide/posts/#links</a><br/><a href=\"http://localhost:8080/tags/gotosocial\" class=\"mention hashtag\" rel=\"tag nofollow noreferrer noopener\" target=\"_blank\">#<span>gotosocial</span></a><br/><br/>(tobi remember to pull the docker image challenge)</p>", statusReply.Content)
assert.Equal(suite.T(), "\u003cp\u003e\u003ca href=\"http://localhost:8080/tags/test\" class=\"mention hashtag\" rel=\"tag nofollow noreferrer noopener\" target=\"_blank\"\u003e#\u003cspan\u003etest\u003c/span\u003e\u003c/a\u003e alright, should be able to post \u003ca href=\"http://localhost:8080/tags/links\" class=\"mention hashtag\" rel=\"tag nofollow noreferrer noopener\" target=\"_blank\"\u003e#\u003cspan\u003elinks\u003c/span\u003e\u003c/a\u003e with fragments in them now, let\u0026#39;s see........\u003cbr/\u003e\u003cbr/\u003e\u003ca href=\"https://docs.gotosocial.org/en/latest/user_guide/posts/#links\" rel=\"noopener nofollow noreferrer\" target=\"_blank\"\u003edocs.gotosocial.org/en/latest/user_guide/posts/#links\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003e\u003ca href=\"http://localhost:8080/tags/gotosocial\" class=\"mention hashtag\" rel=\"tag nofollow noreferrer noopener\" target=\"_blank\"\u003e#\u003cspan\u003egotosocial\u003c/span\u003e\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003e(tobi remember to pull the docker image challenge)\u003c/p\u003e", statusReply.Content)
}
func (suite *StatusCreateTestSuite) TestPostNewStatusWithEmoji() {

63
internal/federation/federator_test.go
View File

@ -19,18 +19,13 @@
package federation_test
import (
"bytes"
"context"
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"net/http"
"net/http/httptest"
"strings"
"testing"
"github.com/go-fed/activity/pub"
"github.com/go-fed/httpsig"
"github.com/sirupsen/logrus"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/suite"
@ -117,63 +112,31 @@ func (suite *ProtocolTestSuite) TestAuthenticatePostInbox() {
sendingAccount := suite.accounts["remote_account_1"]
inboxAccount := suite.accounts["local_account_1"]
encodedPublicKey, err := x509.MarshalPKIXPublicKey(sendingAccount.PublicKey)
assert.NoError(suite.T(), err)
publicKeyBytes := pem.EncodeToMemory(&pem.Block{
Type: "PUBLIC KEY",
Bytes: encodedPublicKey,
})
publicKeyString := strings.ReplaceAll(string(publicKeyBytes), "\n", "\\n")
// for this test we need the client to return the public key of the activity creator on the 'remote' instance
responseBodyString := fmt.Sprintf(`
{
"@context": [
"https://www.w3.org/ns/activitystreams",
"https://w3id.org/security/v1"
],
"id": "%s",
"type": "Person",
"preferredUsername": "%s",
"inbox": "%s",
"publicKey": {
"id": "%s",
"owner": "%s",
"publicKeyPem": "%s"
}
}`, sendingAccount.URI, sendingAccount.Username, sendingAccount.InboxURI, sendingAccount.PublicKeyURI, sendingAccount.URI, publicKeyString)
// create a transport controller whose client will just return the response body string we specified above
tc := testrig.NewTestTransportController(testrig.NewMockHTTPClient(func(req *http.Request) (*http.Response, error) {
r := ioutil.NopCloser(bytes.NewReader([]byte(responseBodyString)))
return &http.Response{
StatusCode: 200,
Body: r,
}, nil
}), suite.db)
tc := testrig.NewTestTransportController(testrig.NewMockHTTPClient(nil), suite.db)
// now setup module being tested, with the mock transport controller
federator := federation.NewFederator(suite.db, testrig.NewTestFederatingDB(suite.db), tc, suite.config, suite.log, suite.typeConverter, testrig.NewTestMediaHandler(suite.db, suite.storage))
// setup request
request := httptest.NewRequest(http.MethodPost, "http://localhost:8080/users/the_mighty_zork/inbox", nil)
// we need these headers for the request to be validated
request.Header.Set("Signature", activity.SignatureHeader)
request.Header.Set("Date", activity.DateHeader)
request.Header.Set("Digest", activity.DigestHeader)
verifier, err := httpsig.NewVerifier(request)
assert.NoError(suite.T(), err)
ctx := context.Background()
// by the time AuthenticatePostInbox is called, PostInboxRequestBodyHook should have already been called,
// which should have set the account and username onto the request. We can replicate that behavior here:
ctxWithAccount := context.WithValue(ctx, util.APAccount, inboxAccount)
ctxWithActivity := context.WithValue(ctxWithAccount, util.APActivity, activity)
ctxWithVerifier := context.WithValue(ctxWithActivity, util.APRequestingPublicKeyVerifier, verifier)
request := httptest.NewRequest(http.MethodPost, "http://localhost:8080/users/the_mighty_zork/inbox", nil) // the endpoint we're hitting
// we need these headers for the request to be validated
request.Header.Set("Signature", activity.SignatureHeader)
request.Header.Set("Date", activity.DateHeader)
request.Header.Set("Digest", activity.DigestHeader)
// we can pass this recorder as a writer and read it back after
recorder := httptest.NewRecorder()
// trigger the function being tested, and return the new context it creates
newContext, authed, err := federator.AuthenticatePostInbox(ctxWithActivity, recorder, request)
newContext, authed, err := federator.AuthenticatePostInbox(ctxWithVerifier, recorder, request)
assert.NoError(suite.T(), err)
assert.True(suite.T(), authed)

49
internal/oauth/clientstore_test.go
View File

@ -21,12 +21,10 @@ import (
"context"
"testing"
"github.com/sirupsen/logrus"
"github.com/stretchr/testify/suite"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/db/pg"
"github.com/superseriousbusiness/gotosocial/internal/oauth"
"github.com/superseriousbusiness/gotosocial/testrig"
"github.com/superseriousbusiness/oauth2/v4/models"
)
@ -43,7 +41,7 @@ const ()
// SetupSuite sets some variables on the suite that we can use as consts (more or less) throughout
func (suite *PgClientStoreTestSuite) SetupSuite() {
suite.testClientID = "test-client-id"
suite.testClientID = "01FCVB74EW6YBYAEY7QG9CQQF6"
suite.testClientSecret = "test-client-secret"
suite.testClientDomain = "https://example.org"
suite.testClientUserID = "test-client-user-id"
@ -51,50 +49,13 @@ func (suite *PgClientStoreTestSuite) SetupSuite() {
// SetupTest creates a postgres connection and creates the oauth_clients table before each test
func (suite *PgClientStoreTestSuite) SetupTest() {
log := logrus.New()
log.SetLevel(logrus.TraceLevel)
c := config.Empty()
c.DBConfig = &config.DBConfig{
Type: "postgres",
Address: "localhost",
Port: 5432,
User: "postgres",
Password: "postgres",
Database: "postgres",
ApplicationName: "gotosocial",
}
db, err := pg.NewPostgresService(context.Background(), c, log)
if err != nil {
logrus.Panicf("error creating database connection: %s", err)
}
suite.db = db
models := []interface{}{
&oauth.Client{},
}
for _, m := range models {
if err := suite.db.CreateTable(m); err != nil {
logrus.Panicf("db connection error: %s", err)
}
}
suite.db = testrig.NewTestDB()
testrig.StandardDBSetup(suite.db, nil)
}
// TearDownTest drops the oauth_clients table and closes the pg connection after each test
func (suite *PgClientStoreTestSuite) TearDownTest() {
models := []interface{}{
&oauth.Client{},
}
for _, m := range models {
if err := suite.db.DropTable(m); err != nil {
logrus.Panicf("error dropping table: %s", err)
}
}
if err := suite.db.Stop(context.Background()); err != nil {
logrus.Panicf("error closing db connection: %s", err)
}
suite.db = nil
testrig.StandardDBTeardown(suite.db)
}
func (suite *PgClientStoreTestSuite) TestClientStoreSetAndGet() {

57
internal/typeutils/astointernal_test.go
View File

@ -25,7 +25,6 @@ import (
"testing"
"github.com/go-fed/activity/streams"
"github.com/go-fed/activity/streams/vocab"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/suite"
"github.com/superseriousbusiness/gotosocial/internal/ap"
@ -375,62 +374,6 @@ func (suite *ASToInternalTestSuite) TestParseGargron() {
// TODO: write assertions here, rn we're just eyeballing the output
}
func (suite *ASToInternalTestSuite) TestParseStatus() {
m := make(map[string]interface{})
err := json.Unmarshal([]byte(statusWithEmojisAndTagsAsActivityJson), &m)
assert.NoError(suite.T(), err)
t, err := streams.ToType(context.Background(), m)
assert.NoError(suite.T(), err)
create, ok := t.(vocab.ActivityStreamsCreate)
assert.True(suite.T(), ok)
obj := create.GetActivityStreamsObject()
assert.NotNil(suite.T(), obj)
first := obj.Begin()
assert.NotNil(suite.T(), first)
rep, ok := first.GetType().(ap.Statusable)
assert.True(suite.T(), ok)
status, err := suite.typeconverter.ASStatusToStatus(rep)
assert.NoError(suite.T(), err)
assert.Len(suite.T(), status.GTSEmojis, 3)
// assert.Len(suite.T(), status.GTSTags, 2) TODO: implement this first so that it can pick up tags
}
func (suite *ASToInternalTestSuite) TestParseStatusWithMention() {
m := make(map[string]interface{})
err := json.Unmarshal([]byte(statusWithMentionsActivityJson), &m)
assert.NoError(suite.T(), err)
t, err := streams.ToType(context.Background(), m)
assert.NoError(suite.T(), err)
create, ok := t.(vocab.ActivityStreamsCreate)
assert.True(suite.T(), ok)
obj := create.GetActivityStreamsObject()
assert.NotNil(suite.T(), obj)
first := obj.Begin()
assert.NotNil(suite.T(), first)
rep, ok := first.GetType().(ap.Statusable)
assert.True(suite.T(), ok)
status, err := suite.typeconverter.ASStatusToStatus(rep)
assert.NoError(suite.T(), err)
fmt.Printf("%+v", status)
assert.Len(suite.T(), status.GTSMentions, 1)
fmt.Println(status.GTSMentions[0])
}
func (suite *ASToInternalTestSuite) TearDownTest() {
testrig.StandardDBTeardown(suite.db)
}

2
internal/typeutils/frontendtointernal.go
View File

@ -32,6 +32,8 @@ func (c *converter) MastoVisToVis(m model.Visibility) gtsmodel.Visibility {
return gtsmodel.VisibilityUnlocked
case model.VisibilityPrivate:
return gtsmodel.VisibilityFollowersOnly
case model.VisibilityMutualsOnly:
return gtsmodel.VisibilityMutualsOnly
case model.VisibilityDirect:
return gtsmodel.VisibilityDirect
}

11
testrig/db.go
View File

@ -20,6 +20,7 @@ package testrig
import (
"context"
"os"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/db"
@ -52,9 +53,17 @@ var testModels []interface{} = []interface{}{
&oauth.Client{},
}
// NewTestDB returns a new initialized, empty database for testing
// NewTestDB returns a new initialized, empty database for testing.
//
// If the environment variable GTS_DB_ADDRESS is set, it will take that
// value as the database address instead.
func NewTestDB() db.DB {
config := NewTestConfig()
alternateAddress := os.Getenv("GTS_DB_ADDRESS")
if alternateAddress != "" {
config.DBConfig.Address = alternateAddress
}
l := logrus.New()
l.SetLevel(logrus.TraceLevel)
testDB, err := pg.NewPostgresService(context.Background(), config, l)

22
vendor/github.com/aymerick/douceur/LICENSE generated vendored Normal file
View File

@ -0,0 +1,22 @@
The MIT License (MIT)
Copyright (c) 2015 Aymerick JEHANNE
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

60
vendor/github.com/aymerick/douceur/css/declaration.go generated vendored Normal file
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@ -0,0 +1,60 @@
package css
import "fmt"
// Declaration represents a parsed style property
type Declaration struct {
Property string
Value string
Important bool
}
// NewDeclaration instanciates a new Declaration
func NewDeclaration() *Declaration {
return &Declaration{}
}
// Returns string representation of the Declaration
func (decl *Declaration) String() string {
return decl.StringWithImportant(true)
}
// StringWithImportant returns string representation with optional !important part
func (decl *Declaration) StringWithImportant(option bool) string {
result := fmt.Sprintf("%s: %s", decl.Property, decl.Value)
if option && decl.Important {
result += " !important"
}
result += ";"
return result
}
// Equal returns true if both Declarations are equals
func (decl *Declaration) Equal(other *Declaration) bool {
return (decl.Property == other.Property) && (decl.Value == other.Value) && (decl.Important == other.Important)
}
//
// DeclarationsByProperty
//
// DeclarationsByProperty represents sortable style declarations
type DeclarationsByProperty []*Declaration
// Implements sort.Interface
func (declarations DeclarationsByProperty) Len() int {
return len(declarations)
}
// Implements sort.Interface
func (declarations DeclarationsByProperty) Swap(i, j int) {
declarations[i], declarations[j] = declarations[j], declarations[i]
}
// Implements sort.Interface
func (declarations DeclarationsByProperty) Less(i, j int) bool {
return declarations[i].Property < declarations[j].Property
}

230
vendor/github.com/aymerick/douceur/css/rule.go generated vendored Normal file
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@ -0,0 +1,230 @@
package css
import (
"fmt"
"strings"
)
const (
indentSpace = 2
)
// RuleKind represents a Rule kind
type RuleKind int
// Rule kinds
const (
QualifiedRule RuleKind = iota
AtRule
)
// At Rules than have Rules inside their block instead of Declarations
var atRulesWithRulesBlock = []string{
"@document", "@font-feature-values", "@keyframes", "@media", "@supports",
}
// Rule represents a parsed CSS rule
type Rule struct {
Kind RuleKind
// At Rule name (eg: "@media")
Name string
// Raw prelude
Prelude string
// Qualified Rule selectors parsed from prelude
Selectors []string
// Style properties
Declarations []*Declaration
// At Rule embedded rules
Rules []*Rule
// Current rule embedding level
EmbedLevel int
}
// NewRule instanciates a new Rule
func NewRule(kind RuleKind) *Rule {
return &Rule{
Kind: kind,
}
}
// Returns string representation of rule kind
func (kind RuleKind) String() string {
switch kind {
case QualifiedRule:
return "Qualified Rule"
case AtRule:
return "At Rule"
default:
return "WAT"
}
}
// EmbedsRules returns true if this rule embeds another rules
func (rule *Rule) EmbedsRules() bool {
if rule.Kind == AtRule {
for _, atRuleName := range atRulesWithRulesBlock {
if rule.Name == atRuleName {
return true
}
}
}
return false
}
// Equal returns true if both rules are equals
func (rule *Rule) Equal(other *Rule) bool {
if (rule.Kind != other.Kind) ||
(rule.Prelude != other.Prelude) ||
(rule.Name != other.Name) {
return false
}
if (len(rule.Selectors) != len(other.Selectors)) ||
(len(rule.Declarations) != len(other.Declarations)) ||
(len(rule.Rules) != len(other.Rules)) {
return false
}
for i, sel := range rule.Selectors {
if sel != other.Selectors[i] {
return false
}
}
for i, decl := range rule.Declarations {
if !decl.Equal(other.Declarations[i]) {
return false
}
}
for i, rule := range rule.Rules {
if !rule.Equal(other.Rules[i]) {
return false
}
}
return true
}
// Diff returns a string representation of rules differences
func (rule *Rule) Diff(other *Rule) []string {
result := []string{}
if rule.Kind != other.Kind {
result = append(result, fmt.Sprintf("Kind: %s | %s", rule.Kind.String(), other.Kind.String()))
}
if rule.Prelude != other.Prelude {
result = append(result, fmt.Sprintf("Prelude: \"%s\" | \"%s\"", rule.Prelude, other.Prelude))
}
if rule.Name != other.Name {
result = append(result, fmt.Sprintf("Name: \"%s\" | \"%s\"", rule.Name, other.Name))
}
if len(rule.Selectors) != len(other.Selectors) {
result = append(result, fmt.Sprintf("Selectors: %v | %v", strings.Join(rule.Selectors, ", "), strings.Join(other.Selectors, ", ")))
} else {
for i, sel := range rule.Selectors {
if sel != other.Selectors[i] {
result = append(result, fmt.Sprintf("Selector: \"%s\" | \"%s\"", sel, other.Selectors[i]))
}
}
}
if len(rule.Declarations) != len(other.Declarations) {
result = append(result, fmt.Sprintf("Declarations Nb: %d | %d", len(rule.Declarations), len(other.Declarations)))
} else {
for i, decl := range rule.Declarations {
if !decl.Equal(other.Declarations[i]) {
result = append(result, fmt.Sprintf("Declaration: \"%s\" | \"%s\"", decl.String(), other.Declarations[i].String()))
}
}
}
if len(rule.Rules) != len(other.Rules) {
result = append(result, fmt.Sprintf("Rules Nb: %d | %d", len(rule.Rules), len(other.Rules)))
} else {
for i, rule := range rule.Rules {
if !rule.Equal(other.Rules[i]) {
result = append(result, fmt.Sprintf("Rule: \"%s\" | \"%s\"", rule.String(), other.Rules[i].String()))
}
}
}
return result
}
// Returns the string representation of a rule
func (rule *Rule) String() string {
result := ""
if rule.Kind == QualifiedRule {
for i, sel := range rule.Selectors {
if i != 0 {
result += ", "
}
result += sel
}
} else {
// AtRule
result += fmt.Sprintf("%s", rule.Name)
if rule.Prelude != "" {
if result != "" {
result += " "
}
result += fmt.Sprintf("%s", rule.Prelude)
}
}
if (len(rule.Declarations) == 0) && (len(rule.Rules) == 0) {
result += ";"
} else {
result += " {\n"
if rule.EmbedsRules() {
for _, subRule := range rule.Rules {
result += fmt.Sprintf("%s%s\n", rule.indent(), subRule.String())
}
} else {
for _, decl := range rule.Declarations {
result += fmt.Sprintf("%s%s\n", rule.indent(), decl.String())
}
}
result += fmt.Sprintf("%s}", rule.indentEndBlock())
}
return result
}
// Returns identation spaces for declarations and rules
func (rule *Rule) indent() string {
result := ""
for i := 0; i < ((rule.EmbedLevel + 1) * indentSpace); i++ {
result += " "
}
return result
}
// Returns identation spaces for end of block character
func (rule *Rule) indentEndBlock() string {
result := ""
for i := 0; i < (rule.EmbedLevel * indentSpace); i++ {
result += " "
}
return result
}

25
vendor/github.com/aymerick/douceur/css/stylesheet.go generated vendored Normal file
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@ -0,0 +1,25 @@
package css
// Stylesheet represents a parsed stylesheet
type Stylesheet struct {
Rules []*Rule
}
// NewStylesheet instanciate a new Stylesheet
func NewStylesheet() *Stylesheet {
return &Stylesheet{}
}
// Returns string representation of the Stylesheet
func (sheet *Stylesheet) String() string {
result := ""
for _, rule := range sheet.Rules {
if result != "" {
result += "\n"
}
result += rule.String()
}
return result
}

409
vendor/github.com/aymerick/douceur/parser/parser.go generated vendored Normal file
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@ -0,0 +1,409 @@
package parser
import (
"errors"
"fmt"
"regexp"
"strings"
"github.com/gorilla/css/scanner"
"github.com/aymerick/douceur/css"
)
const (
importantSuffixRegexp = `(?i)\s*!important\s*$`
)
var (
importantRegexp *regexp.Regexp
)
// Parser represents a CSS parser
type Parser struct {
scan *scanner.Scanner // Tokenizer
// Tokens parsed but not consumed yet
tokens []*scanner.Token
// Rule embedding level
embedLevel int
}
func init() {
importantRegexp = regexp.MustCompile(importantSuffixRegexp)
}
// NewParser instanciates a new parser
func NewParser(txt string) *Parser {
return &Parser{
scan: scanner.New(txt),
}
}
// Parse parses a whole stylesheet
func Parse(text string) (*css.Stylesheet, error) {
result, err := NewParser(text).ParseStylesheet()
if err != nil {
return nil, err
}
return result, nil
}
// ParseDeclarations parses CSS declarations
func ParseDeclarations(text string) ([]*css.Declaration, error) {
result, err := NewParser(text).ParseDeclarations()
if err != nil {
return nil, err
}
return result, nil
}
// ParseStylesheet parses a stylesheet
func (parser *Parser) ParseStylesheet() (*css.Stylesheet, error) {
result := css.NewStylesheet()
// Parse BOM
if _, err := parser.parseBOM(); err != nil {
return result, err
}
// Parse list of rules
rules, err := parser.ParseRules()
if err != nil {
return result, err
}
result.Rules = rules
return result, nil
}
// ParseRules parses a list of rules
func (parser *Parser) ParseRules() ([]*css.Rule, error) {
result := []*css.Rule{}
inBlock := false
if parser.tokenChar("{") {
// parsing a block of rules
inBlock = true
parser.embedLevel++
parser.shiftToken()
}
for parser.tokenParsable() {
if parser.tokenIgnorable() {
parser.shiftToken()
} else if parser.tokenChar("}") {
if !inBlock {
errMsg := fmt.Sprintf("Unexpected } character: %s", parser.nextToken().String())
return result, errors.New(errMsg)
}
parser.shiftToken()
parser.embedLevel--
// finished
break
} else {
rule, err := parser.ParseRule()
if err != nil {
return result, err
}
rule.EmbedLevel = parser.embedLevel
result = append(result, rule)
}
}
return result, parser.err()
}
// ParseRule parses a rule
func (parser *Parser) ParseRule() (*css.Rule, error) {
if parser.tokenAtKeyword() {
return parser.parseAtRule()
}
return parser.parseQualifiedRule()
}
// ParseDeclarations parses a list of declarations
func (parser *Parser) ParseDeclarations() ([]*css.Declaration, error) {
result := []*css.Declaration{}
if parser.tokenChar("{") {
parser.shiftToken()
}
for parser.tokenParsable() {
if parser.tokenIgnorable() {
parser.shiftToken()
} else if parser.tokenChar("}") {
// end of block
parser.shiftToken()
break
} else {
declaration, err := parser.ParseDeclaration()
if err != nil {
return result, err
}
result = append(result, declaration)
}
}
return result, parser.err()
}
// ParseDeclaration parses a declaration
func (parser *Parser) ParseDeclaration() (*css.Declaration, error) {
result := css.NewDeclaration()
curValue := ""
for parser.tokenParsable() {
if parser.tokenChar(":") {
result.Property = strings.TrimSpace(curValue)
curValue = ""
parser.shiftToken()
} else if parser.tokenChar(";") || parser.tokenChar("}") {
if result.Property == "" {
errMsg := fmt.Sprintf("Unexpected ; character: %s", parser.nextToken().String())
return result, errors.New(errMsg)
}
if importantRegexp.MatchString(curValue) {
result.Important = true
curValue = importantRegexp.ReplaceAllString(curValue, "")
}
result.Value = strings.TrimSpace(curValue)
if parser.tokenChar(";") {
parser.shiftToken()
}
// finished
break
} else {
token := parser.shiftToken()
curValue += token.Value
}
}
// log.Printf("[parsed] Declaration: %s", result.String())
return result, parser.err()
}
// Parse an At Rule
func (parser *Parser) parseAtRule() (*css.Rule, error) {
// parse rule name (eg: "@import")
token := parser.shiftToken()
result := css.NewRule(css.AtRule)
result.Name = token.Value
for parser.tokenParsable() {
if parser.tokenChar(";") {
parser.shiftToken()
// finished
break
} else if parser.tokenChar("{") {
if result.EmbedsRules() {
// parse rules block
rules, err := parser.ParseRules()
if err != nil {
return result, err
}
result.Rules = rules
} else {
// parse declarations block
declarations, err := parser.ParseDeclarations()
if err != nil {
return result, err
}
result.Declarations = declarations
}
// finished
break
} else {
// parse prelude
prelude, err := parser.parsePrelude()
if err != nil {
return result, err
}
result.Prelude = prelude
}
}
// log.Printf("[parsed] Rule: %s", result.String())
return result, parser.err()
}
// Parse a Qualified Rule
func (parser *Parser) parseQualifiedRule() (*css.Rule, error) {
result := css.NewRule(css.QualifiedRule)
for parser.tokenParsable() {
if parser.tokenChar("{") {
if result.Prelude == "" {
errMsg := fmt.Sprintf("Unexpected { character: %s", parser.nextToken().String())
return result, errors.New(errMsg)
}
// parse declarations block
declarations, err := parser.ParseDeclarations()
if err != nil {
return result, err
}
result.Declarations = declarations
// finished
break
} else {
// parse prelude
prelude, err := parser.parsePrelude()
if err != nil {
return result, err
}
result.Prelude = prelude
}
}
result.Selectors = strings.Split(result.Prelude, ",")
for i, sel := range result.Selectors {
result.Selectors[i] = strings.TrimSpace(sel)
}
// log.Printf("[parsed] Rule: %s", result.String())
return result, parser.err()
}
// Parse Rule prelude
func (parser *Parser) parsePrelude() (string, error) {
result := ""
for parser.tokenParsable() && !parser.tokenEndOfPrelude() {
token := parser.shiftToken()
result += token.Value
}
result = strings.TrimSpace(result)
// log.Printf("[parsed] prelude: %s", result)
return result, parser.err()
}
// Parse BOM
func (parser *Parser) parseBOM() (bool, error) {
if parser.nextToken().Type == scanner.TokenBOM {
parser.shiftToken()
return true, nil
}
return false, parser.err()
}
// Returns next token without removing it from tokens buffer
func (parser *Parser) nextToken() *scanner.Token {
if len(parser.tokens) == 0 {
// fetch next token
nextToken := parser.scan.Next()
// log.Printf("[token] %s => %v", nextToken.Type.String(), nextToken.Value)
// queue it
parser.tokens = append(parser.tokens, nextToken)
}
return parser.tokens[0]
}
// Returns next token and remove it from the tokens buffer
func (parser *Parser) shiftToken() *scanner.Token {
var result *scanner.Token
result, parser.tokens = parser.tokens[0], parser.tokens[1:]
return result
}
// Returns tokenizer error, or nil if no error
func (parser *Parser) err() error {
if parser.tokenError() {
token := parser.nextToken()
return fmt.Errorf("Tokenizer error: %s", token.String())
}
return nil
}
// Returns true if next token is Error
func (parser *Parser) tokenError() bool {
return parser.nextToken().Type == scanner.TokenError
}
// Returns true if next token is EOF
func (parser *Parser) tokenEOF() bool {
return parser.nextToken().Type == scanner.TokenEOF
}
// Returns true if next token is a whitespace
func (parser *Parser) tokenWS() bool {
return parser.nextToken().Type == scanner.TokenS
}
// Returns true if next token is a comment
func (parser *Parser) tokenComment() bool {
return parser.nextToken().Type == scanner.TokenComment
}
// Returns true if next token is a CDO or a CDC
func (parser *Parser) tokenCDOorCDC() bool {
switch parser.nextToken().Type {
case scanner.TokenCDO, scanner.TokenCDC:
return true
default:
return false
}
}
// Returns true if next token is ignorable
func (parser *Parser) tokenIgnorable() bool {
return parser.tokenWS() || parser.tokenComment() || parser.tokenCDOorCDC()
}
// Returns true if next token is parsable
func (parser *Parser) tokenParsable() bool {
return !parser.tokenEOF() && !parser.tokenError()
}
// Returns true if next token is an At Rule keyword
func (parser *Parser) tokenAtKeyword() bool {
return parser.nextToken().Type == scanner.TokenAtKeyword
}
// Returns true if next token is given character
func (parser *Parser) tokenChar(value string) bool {
token := parser.nextToken()
return (token.Type == scanner.TokenChar) && (token.Value == value)
}
// Returns true if next token marks the end of a prelude
func (parser *Parser) tokenEndOfPrelude() bool {
return parser.tokenChar(";") || parser.tokenChar("{")
}

2
vendor/github.com/buckket/go-blurhash/.gitignore generated vendored Normal file
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@ -0,0 +1,2 @@
.idea
coverage.txt

14
vendor/github.com/buckket/go-blurhash/.travis.yml generated vendored Normal file
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@ -0,0 +1,14 @@
language: go
go:
- 1.13.x
- 1.14.x
install:
- go get -t -v ./...
script:
- go test -race -coverprofile=coverage.txt -covermode=atomic ./...
after_success:
- bash <(curl -s https://codecov.io/bash)

674
vendor/github.com/buckket/go-blurhash/LICENSE generated vendored Normal file
View File

@ -0,0 +1,674 @@
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license for
software and other kinds of works.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors. You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.
To protect your rights, we need to prevent others from denying you
these rights or asking you to surrender the rights. Therefore, you have
certain responsibilities if you distribute copies of the software, or if
you modify it: responsibilities to respect the freedom of others.
For example, if you distribute copies of such a program, whether
gratis or for a fee, you must pass on to the recipients the same
freedoms that you received. You must make sure that they, too, receive
or can get the source code. And you must show them these terms so they
know their rights.
Developers that use the GNU GPL protect your rights with two steps:
(1) assert copyright on the software, and (2) offer you this License
giving you legal permission to copy, distribute and/or modify it.
For the developers' and authors' protection, the GPL clearly explains
that there is no warranty for this free software. For both users' and
authors' sake, the GPL requires that modified versions be marked as
changed, so that their problems will not be attributed erroneously to
authors of previous versions.
Some devices are designed to deny users access to install or run
modified versions of the software inside them, although the manufacturer
can do so. This is fundamentally incompatible with the aim of
protecting users' freedom to change the software. The systematic
pattern of such abuse occurs in the area of products for individuals to
use, which is precisely where it is most unacceptable. Therefore, we
have designed this version of the GPL to prohibit the practice for those
products. If such problems arise substantially in other domains, we
stand ready to extend this provision to those domains in future versions
of the GPL, as needed to protect the freedom of users.
Finally, every program is threatened constantly by software patents.
States should not allow patents to restrict development and use of
software on general-purpose computers, but in those that do, we wish to
avoid the special danger that patents applied to a free program could
make it effectively proprietary. To prevent this, the GPL assures that
patents cannot be used to render the program non-free.
The precise terms and conditions for copying, distribution and
modification follow.
TERMS AND CONDITIONS
0. Definitions.
"This License" refers to version 3 of the GNU General Public License.
"Copyright" also means copyright-like laws that apply to other kinds of
works, such as semiconductor masks.
"The Program" refers to any copyrightable work licensed under this
License. Each licensee is addressed as "you". "Licensees" and
"recipients" may be individuals or organizations.
To "modify" a work means to copy from or adapt all or part of the work
in a fashion requiring copyright permission, other than the making of an
exact copy. The resulting work is called a "modified version" of the
earlier work or a work "based on" the earlier work.
A "covered work" means either the unmodified Program or a work based
on the Program.
To "propagate" a work means to do anything with it that, without
permission, would make you directly or secondarily liable for
infringement under applicable copyright law, except executing it on a
computer or modifying a private copy. Propagation includes copying,
distribution (with or without modification), making available to the
public, and in some countries other activities as well.
To "convey" a work means any kind of propagation that enables other
parties to make or receive copies. Mere interaction with a user through
a computer network, with no transfer of a copy, is not conveying.
An interactive user interface displays "Appropriate Legal Notices"
to the extent that it includes a convenient and prominently visible
feature that (1) displays an appropriate copyright notice, and (2)
tells the user that there is no warranty for the work (except to the
extent that warranties are provided), that licensees may convey the
work under this License, and how to view a copy of this License. If
the interface presents a list of user commands or options, such as a
menu, a prominent item in the list meets this criterion.
1. Source Code.
The "source code" for a work means the preferred form of the work
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b) The work must carry prominent notices stating that it is
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License will therefore apply, along with any applicable section 7
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Appropriate Legal Notices; however, if the Program has interactive
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works, which are not by their nature extensions of the covered work,
and which are not combined with it such as to form a larger program,
in or on a volume of a storage or distribution medium, is called an
"aggregate" if the compilation and its resulting copyright are not
used to limit the access or legal rights of the compilation's users
beyond what the individual works permit. Inclusion of a covered work
in an aggregate does not cause this License to apply to the other
parts of the aggregate.
6. Conveying Non-Source Forms.
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of sections 4 and 5, provided that you also convey the
machine-readable Corresponding Source under the terms of this License,
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# go-blurhash [![Build Status](https://travis-ci.org/buckket/go-blurhash.svg)](https://travis-ci.org/buckket/go-blurhash) [![Go Report Card](https://goreportcard.com/badge/github.com/buckket/go-blurhash)](https://goreportcard.com/report/github.com/buckket/go-blurhash) [![codecov](https://codecov.io/gh/buckket/go-blurhash/branch/master/graph/badge.svg)](https://codecov.io/gh/buckket/go-blurhash) [![GoDoc](https://godoc.org/github.com/buckket/go-blurhash?status.svg)](https://pkg.go.dev/github.com/buckket/go-blurhash)
**go-blurhash** is a pure Go implementation of the [BlurHash](https://github.com/woltapp/blurhash) algorithm, which is used by
[Mastodon](https://github.com/tootsuite/mastodon) an other Fediverse software to implement a swift way of preloading placeholder images as well
as hiding sensitive media. Read more about it [here](https://blog.joinmastodon.org/2019/05/improving-support-for-adult-content-on-mastodon/).
**tl;dr:** BlurHash is a compact representation of a placeholder for an image.
This library allows generating the BlurHash of a given image, as well as
reconstructing a blurred version with specified dimensions from a given BlurHash.
This library is based on the following reference implementations:
- Encoder: [https://github.com/woltapp/blurhash/blob/master/C](https://github.com/woltapp/blurhash/blob/master/C) (C)
- Deocder: [https://github.com/woltapp/blurhash/blob/master/TypeScript](https://github.com/woltapp/blurhash/blob/master/TypeScript) (TypeScript)
BlurHash is written by [Dag Ågren](https://github.com/DagAgren) / [Wolt](https://github.com/woltapp).
| | Before | After |
| ---------- |:------------------------------:| :-----------------------------:|
| **Image** | ![alt text][test] | "LFE.@D9F01_2%L%MIVD*9Goe-;WB" |
| **Hash** | "LFE.@D9F01_2%L%MIVD*9Goe-;WB" | ![alt text][test_blur]
[test]: test.png "Blurhash example input."
[test_blur]: test_blur.png "Blurhash example output"
## Installation
### From source
go get -u github.com/buckket/go-blurhash
## Usage
go-blurhash exports three functions:
```go
func blurhash.Encode(xComponents, yComponents int, rgba image.Image) (string, error)
func blurhash.Decode(hash string, width, height, punch int) (image.Image, error)
func blurhash.Components(hash string) (xComponents, yComponents int, err error)
```
Here’s a simple demonstration. Check [pkg.go.dev](https://pkg.go.dev/github.com/buckket/go-blurhash) for the full documentation.
```go
package main
import (
"fmt"
"github.com/buckket/go-blurhash"
"image/png"
"os"
)
func main() {
// Generate the BlurHash for a given image
imageFile, _ := os.Open("test.png")
loadedImage, err := png.Decode(imageFile)
str, _ := blurhash.Encode(4, 3, loadedImage)
if err != nil {
// Handle errors
}
fmt.Printf("Hash: %s\n", str)
// Generate an image for a given BlurHash
// Width will be 300px and Height will be 500px
// Punch specifies the contrasts and defaults to 1
img, err := blurhash.Decode(str, 300, 500, 1)
if err != nil {
// Handle errors
}
f, _ := os.Create("test_blur.png")
_ = png.Encode(f, img)
// Get the x and y components used for encoding a given BlurHash
x, y, err := blurhash.Components("LFE.@D9F01_2%L%MIVD*9Goe-;WB")
if err != nil {
// Handle errors
}
fmt.Printf("xComponents: %d, yComponents: %d", x, y)
}
```
## Limitations
- Presumably a bit slower than the C implementation (TODO: Benchmarks)
## Notes
- As mentioned [here](https://github.com/woltapp/blurhash#how-fast-is-encoding-decoding), it’s best to
generate very small images (~32x32px) via BlurHash and scale them up to the desired dimensions afterwards for optimal performance.
- Since [#2](https://github.com/buckket/go-blurhash/pull/2) we diverted from the reference implementation by memorizing sRGBtoLinear values, thus increasing encoding speed at the cost of higher memory usage.
- Starting with v1.1.0 the signature of blurhash.Encode() has changed slightly (see [#3](https://github.com/buckket/go-blurhash/issues/3)).
## License
GNU GPLv3+

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package base83
import (
"fmt"
"math"
"strings"
)
const characters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz#$%*+,-.:;=?@[]^_{|}~"
// An InvalidCharacterError occurs when a characters is found which is not part of the Base83 character set.
type InvalidCharacterError rune
func (e InvalidCharacterError) Error() string {
return fmt.Sprintf("base83: invalid string (character %q out of range)", rune(e))
}
// An InvalidLengthError occurs when a given value cannot be encoded to a string of given length.
type InvalidLengthError int
func (e InvalidLengthError) Error() string {
return fmt.Sprintf("base83: invalid length (%d)", int(e))
}
// Encode will encode the given integer value to a Base83 string with given length.
// If length is too short to encode the given value InvalidLengthError will be returned.
func Encode(value, length int) (string, error) {
divisor := int(math.Pow(83, float64(length)))
if value/divisor != 0 {
return "", InvalidLengthError(length)
}
divisor /= 83
var str strings.Builder
str.Grow(length)
for i := 0; i < length; i++ {
if divisor <= 0 {
return "", InvalidLengthError(length)
}
digit := (value / divisor) % 83
divisor /= 83
str.WriteRune(rune(characters[digit]))
}
return str.String(), nil
}
// Decode will decode the given Base83 string to an integer.
func Decode(str string) (value int, err error) {
for _, r := range str {
idx := strings.IndexRune(characters, r)
if idx == -1 {
return 0, InvalidCharacterError(r)
}
value = value*83 + idx
}
return value, nil
}

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package blurhash
import (
"fmt"
"github.com/buckket/go-blurhash/base83"
"image"
"image/color"
"math"
)
// An InvalidHashError occurs when the given hash is either too short or the length does not match its size flag.
type InvalidHashError string
func (e InvalidHashError) Error() string {
return fmt.Sprintf("blurhash: %s", string(e))
}
// Components decodes and returns the number of x and y components in the given BlurHash.
func Components(hash string) (xComponents, yComponents int, err error) {
if len(hash) < 6 {
return 0, 0, InvalidHashError("hash is invalid (too short)")
}
sizeFlag, err := base83.Decode(string(hash[0]))
if err != nil {
return 0, 0, err
}
yComponents = (sizeFlag / 9) + 1
xComponents = (sizeFlag % 9) + 1
if len(hash) != 4+2*xComponents*yComponents {
return 0, 0, InvalidHashError("hash is invalid (length mismatch)")
}
return xComponents, yComponents, nil
}
// Decode generates an image of the given BlurHash with a size of width and height.
// Punch is a multiplier that adjusts the contrast of the resulting image.
func Decode(hash string, width, height, punch int) (image.Image, error) {
xComp, yComp, err := Components(hash)
if err != nil {
return nil, err
}
quantisedMaximumValue, err := base83.Decode(string(hash[1]))
if err != nil {
return nil, err
}
maximumValue := (float64(quantisedMaximumValue) + 1) / 166
if punch == 0 {
punch = 1
}
colors := make([][3]float64, xComp*yComp)
for i := range colors {
if i == 0 {
value, err := base83.Decode(hash[2:6])
if err != nil {
return nil, err
}
colors[i] = decodeDC(value)
} else {
value, err := base83.Decode(hash[4+i*2 : 6+i*2])
if err != nil {
return nil, err
}
colors[i] = decodeAC(value, maximumValue*float64(punch))
}
}
img := image.NewNRGBA(image.Rect(0, 0, width, height))
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
var r, g, b float64
for j := 0; j < yComp; j++ {
for i := 0; i < xComp; i++ {
basis := math.Cos(math.Pi*float64(x)*float64(i)/float64(width)) *
math.Cos(math.Pi*float64(y)*float64(j)/float64(height))
pcolor := colors[i+j*xComp]
r += pcolor[0] * basis
g += pcolor[1] * basis
b += pcolor[2] * basis
}
}
img.SetNRGBA(x, y, color.NRGBA{R: uint8(linearTosRGB(r)), G: uint8(linearTosRGB(g)), B: uint8(linearTosRGB(b)), A: 255})
}
}
return img, nil
}
func decodeDC(value int) [3]float64 {
return [3]float64{sRGBToLinear(value >> 16), sRGBToLinear(value >> 8 & 255), sRGBToLinear(value & 255)}
}
func decodeAC(value int, maximumValue float64) [3]float64 {
quantR := math.Floor(float64(value) / (19 * 19))
quantG := math.Mod(math.Floor(float64(value)/19), 19)
quantB := math.Mod(float64(value), 19)
sp := func(quant float64) float64 {
return signPow((quant-9)/9, 2.0) * maximumValue
}
return [3]float64{sp(quantR), sp(quantG), sp(quantB)}
}

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package blurhash
import (
"fmt"
"github.com/buckket/go-blurhash/base83"
"image"
"math"
"strings"
)
func init() {
initLinearTable(channelToLinear[:])
}
var channelToLinear [256]float64
func initLinearTable(table []float64) {
for i := range table {
channelToLinear[i] = sRGBToLinear(i)
}
}
// An InvalidParameterError occurs when an invalid argument is passed to either the Decode or Encode function.
type InvalidParameterError struct {
Value int
Parameter string
}
func (e InvalidParameterError) Error() string {
return fmt.Sprintf("blurhash: %sComponents (%d) must be element of [1-9]", e.Parameter, e.Value)
}
// An EncodingError represents an error that occurred during the encoding of the given value.
// This most likely means that your input image is invalid and can not be processed.
type EncodingError string
func (e EncodingError) Error() string {
return fmt.Sprintf("blurhash: %s", string(e))
}
// Encode calculates the Blurhash for an image using the given x and y component counts.
// The x and y components have to be between 1 and 9 respectively.
// The image must be of image.Image type.
func Encode(xComponents int, yComponents int, rgba image.Image) (string, error) {
if xComponents < 1 || xComponents > 9 {
return "", InvalidParameterError{xComponents, "x"}
}
if yComponents < 1 || yComponents > 9 {
return "", InvalidParameterError{yComponents, "y"}
}
var blurhash strings.Builder
blurhash.Grow(4 + 2*xComponents*yComponents)
// Size Flag
str, err := base83.Encode((xComponents-1)+(yComponents-1)*9, 1)
if err != nil {
return "", EncodingError("could not encode size flag")
}
blurhash.WriteString(str)
factors := make([]float64, yComponents*xComponents*3)
multiplyBasisFunction(rgba, factors, xComponents, yComponents)
var maximumValue float64
var quantisedMaximumValue int
var acCount = xComponents*yComponents - 1
if acCount > 0 {
var actualMaximumValue float64
for i := 0; i < acCount*3; i++ {
actualMaximumValue = math.Max(math.Abs(factors[i+3]), actualMaximumValue)
}
quantisedMaximumValue = int(math.Max(0, math.Min(82, math.Floor(actualMaximumValue*166-0.5))))
maximumValue = (float64(quantisedMaximumValue) + 1) / 166
} else {
maximumValue = 1
}
// Quantised max AC component
str, err = base83.Encode(quantisedMaximumValue, 1)
if err != nil {
return "", EncodingError("could not encode quantised max AC component")
}
blurhash.WriteString(str)
// DC value
str, err = base83.Encode(encodeDC(factors[0], factors[1], factors[2]), 4)
if err != nil {
return "", EncodingError("could not encode DC value")
}
blurhash.WriteString(str)
// AC values
for i := 0; i < acCount; i++ {
str, err = base83.Encode(encodeAC(factors[3+(i*3+0)], factors[3+(i*3+1)], factors[3+(i*3+2)], maximumValue), 2)
if err != nil {
return "", EncodingError("could not encode AC value")
}
blurhash.WriteString(str)
}
if blurhash.Len() != 4+2*xComponents*yComponents {
return "", EncodingError("hash does not match expected size")
}
return blurhash.String(), nil
}
func multiplyBasisFunction(rgba image.Image, factors []float64, xComponents int, yComponents int) {
height := rgba.Bounds().Max.Y
width := rgba.Bounds().Max.X
xvalues := make([][]float64, xComponents)
for xComponent := 0; xComponent < xComponents; xComponent++ {
xvalues[xComponent] = make([]float64, width)
for x := 0; x < width; x++ {
xvalues[xComponent][x] = math.Cos(math.Pi * float64(xComponent) * float64(x) / float64(width))
}
}
yvalues := make([][]float64, yComponents)
for yComponent := 0; yComponent < yComponents; yComponent++ {
yvalues[yComponent] = make([]float64, height)
for y := 0; y < height; y++ {
yvalues[yComponent][y] = math.Cos(math.Pi * float64(yComponent) * float64(y) / float64(height))
}
}
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
rt, gt, bt, _ := rgba.At(x, y).RGBA()
lr := channelToLinear[rt>>8]
lg := channelToLinear[gt>>8]
lb := channelToLinear[bt>>8]
for yc := 0; yc < yComponents; yc++ {
for xc := 0; xc < xComponents; xc++ {
scale := 1 / float64(width*height)
if xc != 0 || yc != 0 {
scale = 2 / float64(width*height)
}
basis := xvalues[xc][x] * yvalues[yc][y]
factors[0+xc*3+yc*3*xComponents] += lr * basis * scale
factors[1+xc*3+yc*3*xComponents] += lg * basis * scale
factors[2+xc*3+yc*3*xComponents] += lb * basis * scale
}
}
}
}
}
func encodeDC(r, g, b float64) int {
return (linearTosRGB(r) << 16) + (linearTosRGB(g) << 8) + linearTosRGB(b)
}
func encodeAC(r, g, b, maximumValue float64) int {
quant := func(f float64) int {
return int(math.Max(0, math.Min(18, math.Floor(signPow(f/maximumValue, 0.5)*9+9.5))))
}
return quant(r)*19*19 + quant(g)*19 + quant(b)
}

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module github.com/buckket/go-blurhash
go 1.14

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package blurhash
import "math"
func linearTosRGB(value float64) int {
v := math.Max(0, math.Min(1, value))
if v <= 0.0031308 {
return int(v*12.92*255 + 0.5)
}
return int((1.055*math.Pow(v, 1/2.4)-0.055)*255 + 0.5)
}
func sRGBToLinear(value int) float64 {
v := float64(value) / 255
if v <= 0.04045 {
return v / 12.92
}
return math.Pow((v+0.055)/1.055, 2.4)
}
func signPow(value, exp float64) float64 {
return math.Copysign(math.Pow(math.Abs(value), exp), value)
}

202
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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"Contribution" shall mean any work of authorship, including
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of the NOTICE file are for informational purposes only and
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You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
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the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
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7. Disclaimer of Warranty. Unless required by applicable law or
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8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
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incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "{}"
replaced with your own identifying information. (Don't include
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you may not use this file except in compliance with the License.
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Unless required by applicable law or agreed to in writing, software
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

5
vendor/github.com/coreos/go-oidc/v3/NOTICE generated vendored Normal file
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CoreOS Project
Copyright 2014 CoreOS, Inc
This product includes software developed at CoreOS, Inc.
(http://www.coreos.com/).

16
vendor/github.com/coreos/go-oidc/v3/oidc/jose.go generated vendored Normal file
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package oidc
// JOSE asymmetric signing algorithm values as defined by RFC 7518
//
// see: https://tools.ietf.org/html/rfc7518#section-3.1
const (
RS256 = "RS256" // RSASSA-PKCS-v1.5 using SHA-256
RS384 = "RS384" // RSASSA-PKCS-v1.5 using SHA-384
RS512 = "RS512" // RSASSA-PKCS-v1.5 using SHA-512
ES256 = "ES256" // ECDSA using P-256 and SHA-256
ES384 = "ES384" // ECDSA using P-384 and SHA-384
ES512 = "ES512" // ECDSA using P-521 and SHA-512
PS256 = "PS256" // RSASSA-PSS using SHA256 and MGF1-SHA256
PS384 = "PS384" // RSASSA-PSS using SHA384 and MGF1-SHA384
PS512 = "PS512" // RSASSA-PSS using SHA512 and MGF1-SHA512
)

208
vendor/github.com/coreos/go-oidc/v3/oidc/jwks.go generated vendored Normal file
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package oidc
import (
"context"
"errors"
"fmt"
"io/ioutil"
"net/http"
"sync"
"time"
jose "gopkg.in/square/go-jose.v2"
)
// NewRemoteKeySet returns a KeySet that can validate JSON web tokens by using HTTP
// GETs to fetch JSON web token sets hosted at a remote URL. This is automatically
// used by NewProvider using the URLs returned by OpenID Connect discovery, but is
// exposed for providers that don't support discovery or to prevent round trips to the
// discovery URL.
//
// The returned KeySet is a long lived verifier that caches keys based on cache-control
// headers. Reuse a common remote key set instead of creating new ones as needed.
func NewRemoteKeySet(ctx context.Context, jwksURL string) *RemoteKeySet {
return newRemoteKeySet(ctx, jwksURL, time.Now)
}
func newRemoteKeySet(ctx context.Context, jwksURL string, now func() time.Time) *RemoteKeySet {
if now == nil {
now = time.Now
}
return &RemoteKeySet{jwksURL: jwksURL, ctx: cloneContext(ctx), now: now}
}
// RemoteKeySet is a KeySet implementation that validates JSON web tokens against
// a jwks_uri endpoint.
type RemoteKeySet struct {
jwksURL string
ctx context.Context
now func() time.Time
// guard all other fields
mu sync.Mutex
// inflight suppresses parallel execution of updateKeys and allows
// multiple goroutines to wait for its result.
inflight *inflight
// A set of cached keys.
cachedKeys []jose.JSONWebKey
}
// inflight is used to wait on some in-flight request from multiple goroutines.
type inflight struct {
doneCh chan struct{}
keys []jose.JSONWebKey
err error
}
func newInflight() *inflight {
return &inflight{doneCh: make(chan struct{})}
}
// wait returns a channel that multiple goroutines can receive on. Once it returns
// a value, the inflight request is done and result() can be inspected.
func (i *inflight) wait() <-chan struct{} {
return i.doneCh
}
// done can only be called by a single goroutine. It records the result of the
// inflight request and signals other goroutines that the result is safe to
// inspect.
func (i *inflight) done(keys []jose.JSONWebKey, err error) {
i.keys = keys
i.err = err
close(i.doneCh)
}
// result cannot be called until the wait() channel has returned a value.
func (i *inflight) result() ([]jose.JSONWebKey, error) {
return i.keys, i.err
}
// VerifySignature validates a payload against a signature from the jwks_uri.
//
// Users MUST NOT call this method directly and should use an IDTokenVerifier
// instead. This method skips critical validations such as 'alg' values and is
// only exported to implement the KeySet interface.
func (r *RemoteKeySet) VerifySignature(ctx context.Context, jwt string) ([]byte, error) {
jws, err := jose.ParseSigned(jwt)
if err != nil {
return nil, fmt.Errorf("oidc: malformed jwt: %v", err)
}
return r.verify(ctx, jws)
}
func (r *RemoteKeySet) verify(ctx context.Context, jws *jose.JSONWebSignature) ([]byte, error) {
// We don't support JWTs signed with multiple signatures.
keyID := ""
for _, sig := range jws.Signatures {
keyID = sig.Header.KeyID
break
}
keys := r.keysFromCache()
for _, key := range keys {
if keyID == "" || key.KeyID == keyID {
if payload, err := jws.Verify(&key); err == nil {
return payload, nil
}
}
}
// If the kid doesn't match, check for new keys from the remote. This is the
// strategy recommended by the spec.
//
// https://openid.net/specs/openid-connect-core-1_0.html#RotateSigKeys
keys, err := r.keysFromRemote(ctx)
if err != nil {
return nil, fmt.Errorf("fetching keys %v", err)
}
for _, key := range keys {
if keyID == "" || key.KeyID == keyID {
if payload, err := jws.Verify(&key); err == nil {
return payload, nil
}
}
}
return nil, errors.New("failed to verify id token signature")
}
func (r *RemoteKeySet) keysFromCache() (keys []jose.JSONWebKey) {
r.mu.Lock()
defer r.mu.Unlock()
return r.cachedKeys
}
// keysFromRemote syncs the key set from the remote set, records the values in the
// cache, and returns the key set.
func (r *RemoteKeySet) keysFromRemote(ctx context.Context) ([]jose.JSONWebKey, error) {
// Need to lock to inspect the inflight request field.
r.mu.Lock()
// If there's not a current inflight request, create one.
if r.inflight == nil {
r.inflight = newInflight()
// This goroutine has exclusive ownership over the current inflight
// request. It releases the resource by nil'ing the inflight field
// once the goroutine is done.
go func() {
// Sync keys and finish inflight when that's done.
keys, err := r.updateKeys()
r.inflight.done(keys, err)
// Lock to update the keys and indicate that there is no longer an
// inflight request.
r.mu.Lock()
defer r.mu.Unlock()
if err == nil {
r.cachedKeys = keys
}
// Free inflight so a different request can run.
r.inflight = nil
}()
}
inflight := r.inflight
r.mu.Unlock()
select {
case <-ctx.Done():
return nil, ctx.Err()
case <-inflight.wait():
return inflight.result()
}
}
func (r *RemoteKeySet) updateKeys() ([]jose.JSONWebKey, error) {
req, err := http.NewRequest("GET", r.jwksURL, nil)
if err != nil {
return nil, fmt.Errorf("oidc: can't create request: %v", err)
}
resp, err := doRequest(r.ctx, req)
if err != nil {
return nil, fmt.Errorf("oidc: get keys failed %v", err)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("unable to read response body: %v", err)
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("oidc: get keys failed: %s %s", resp.Status, body)
}
var keySet jose.JSONWebKeySet
err = unmarshalResp(resp, body, &keySet)
if err != nil {
return nil, fmt.Errorf("oidc: failed to decode keys: %v %s", err, body)
}
return keySet.Keys, nil
}

459
vendor/github.com/coreos/go-oidc/v3/oidc/oidc.go generated vendored Normal file
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// Package oidc implements OpenID Connect client logic for the golang.org/x/oauth2 package.
package oidc
import (
"context"
"crypto/sha256"
"crypto/sha512"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"hash"
"io/ioutil"
"mime"
"net/http"
"strings"
"time"
"golang.org/x/oauth2"
jose "gopkg.in/square/go-jose.v2"
)
const (
// ScopeOpenID is the mandatory scope for all OpenID Connect OAuth2 requests.
ScopeOpenID = "openid"
// ScopeOfflineAccess is an optional scope defined by OpenID Connect for requesting
// OAuth2 refresh tokens.
//
// Support for this scope differs between OpenID Connect providers. For instance
// Google rejects it, favoring appending "access_type=offline" as part of the
// authorization request instead.
//
// See: https://openid.net/specs/openid-connect-core-1_0.html#OfflineAccess
ScopeOfflineAccess = "offline_access"
)
var (
errNoAtHash = errors.New("id token did not have an access token hash")
errInvalidAtHash = errors.New("access token hash does not match value in ID token")
)
// ClientContext returns a new Context that carries the provided HTTP client.
//
// This method sets the same context key used by the golang.org/x/oauth2 package,
// so the returned context works for that package too.
//
// myClient := &http.Client{}
// ctx := oidc.ClientContext(parentContext, myClient)
//
// // This will use the custom client
// provider, err := oidc.NewProvider(ctx, "https://accounts.example.com")
//
func ClientContext(ctx context.Context, client *http.Client) context.Context {
return context.WithValue(ctx, oauth2.HTTPClient, client)
}
// cloneContext copies a context's bag-of-values into a new context that isn't
// associated with its cancelation. This is used to initialize remote keys sets
// which run in the background and aren't associated with the initial context.
func cloneContext(ctx context.Context) context.Context {
cp := context.Background()
if c, ok := ctx.Value(oauth2.HTTPClient).(*http.Client); ok {
cp = ClientContext(cp, c)
}
return cp
}
func doRequest(ctx context.Context, req *http.Request) (*http.Response, error) {
client := http.DefaultClient
if c, ok := ctx.Value(oauth2.HTTPClient).(*http.Client); ok {
client = c
}
return client.Do(req.WithContext(ctx))
}
// Provider represents an OpenID Connect server's configuration.
type Provider struct {
issuer string
authURL string
tokenURL string
userInfoURL string
algorithms []string
// Raw claims returned by the server.
rawClaims []byte
remoteKeySet KeySet
}
type cachedKeys struct {
keys []jose.JSONWebKey
expiry time.Time
}
type providerJSON struct {
Issuer string `json:"issuer"`
AuthURL string `json:"authorization_endpoint"`
TokenURL string `json:"token_endpoint"`
JWKSURL string `json:"jwks_uri"`
UserInfoURL string `json:"userinfo_endpoint"`
Algorithms []string `json:"id_token_signing_alg_values_supported"`
}
// supportedAlgorithms is a list of algorithms explicitly supported by this
// package. If a provider supports other algorithms, such as HS256 or none,
// those values won't be passed to the IDTokenVerifier.
var supportedAlgorithms = map[string]bool{
RS256: true,
RS384: true,
RS512: true,
ES256: true,
ES384: true,
ES512: true,
PS256: true,
PS384: true,
PS512: true,
}
// NewProvider uses the OpenID Connect discovery mechanism to construct a Provider.
//
// The issuer is the URL identifier for the service. For example: "https://accounts.google.com"
// or "https://login.salesforce.com".
func NewProvider(ctx context.Context, issuer string) (*Provider, error) {
wellKnown := strings.TrimSuffix(issuer, "/") + "/.well-known/openid-configuration"
req, err := http.NewRequest("GET", wellKnown, nil)
if err != nil {
return nil, err
}
resp, err := doRequest(ctx, req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("unable to read response body: %v", err)
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("%s: %s", resp.Status, body)
}
var p providerJSON
err = unmarshalResp(resp, body, &p)
if err != nil {
return nil, fmt.Errorf("oidc: failed to decode provider discovery object: %v", err)
}
if p.Issuer != issuer {
return nil, fmt.Errorf("oidc: issuer did not match the issuer returned by provider, expected %q got %q", issuer, p.Issuer)
}
var algs []string
for _, a := range p.Algorithms {
if supportedAlgorithms[a] {
algs = append(algs, a)
}
}
return &Provider{
issuer: p.Issuer,
authURL: p.AuthURL,
tokenURL: p.TokenURL,
userInfoURL: p.UserInfoURL,
algorithms: algs,
rawClaims: body,
remoteKeySet: NewRemoteKeySet(cloneContext(ctx), p.JWKSURL),
}, nil
}
// Claims unmarshals raw fields returned by the server during discovery.
//
// var claims struct {
// ScopesSupported []string `json:"scopes_supported"`
// ClaimsSupported []string `json:"claims_supported"`
// }
//
// if err := provider.Claims(&claims); err != nil {
// // handle unmarshaling error
// }
//
// For a list of fields defined by the OpenID Connect spec see:
// https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata
func (p *Provider) Claims(v interface{}) error {
if p.rawClaims == nil {
return errors.New("oidc: claims not set")
}
return json.Unmarshal(p.rawClaims, v)
}
// Endpoint returns the OAuth2 auth and token endpoints for the given provider.
func (p *Provider) Endpoint() oauth2.Endpoint {
return oauth2.Endpoint{AuthURL: p.authURL, TokenURL: p.tokenURL}
}
// UserInfo represents the OpenID Connect userinfo claims.
type UserInfo struct {
Subject string `json:"sub"`
Profile string `json:"profile"`
Email string `json:"email"`
EmailVerified bool `json:"email_verified"`
claims []byte
}
type userInfoRaw struct {
Subject string `json:"sub"`
Profile string `json:"profile"`
Email string `json:"email"`
// Handle providers that return email_verified as a string
// https://forums.aws.amazon.com/thread.jspa?messageID=949441&#949441 and
// https://discuss.elastic.co/t/openid-error-after-authenticating-against-aws-cognito/206018/11
EmailVerified stringAsBool `json:"email_verified"`
}
// Claims unmarshals the raw JSON object claims into the provided object.
func (u *UserInfo) Claims(v interface{}) error {
if u.claims == nil {
return errors.New("oidc: claims not set")
}
return json.Unmarshal(u.claims, v)
}
// UserInfo uses the token source to query the provider's user info endpoint.
func (p *Provider) UserInfo(ctx context.Context, tokenSource oauth2.TokenSource) (*UserInfo, error) {
if p.userInfoURL == "" {
return nil, errors.New("oidc: user info endpoint is not supported by this provider")
}
req, err := http.NewRequest("GET", p.userInfoURL, nil)
if err != nil {
return nil, fmt.Errorf("oidc: create GET request: %v", err)
}
token, err := tokenSource.Token()
if err != nil {
return nil, fmt.Errorf("oidc: get access token: %v", err)
}
token.SetAuthHeader(req)
resp, err := doRequest(ctx, req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("%s: %s", resp.Status, body)
}
ct := resp.Header.Get("Content-Type")
mediaType, _, parseErr := mime.ParseMediaType(ct)
if parseErr == nil && mediaType == "application/jwt" {
payload, err := p.remoteKeySet.VerifySignature(ctx, string(body))
if err != nil {
return nil, fmt.Errorf("oidc: invalid userinfo jwt signature %v", err)
}
body = payload
}
var userInfo userInfoRaw
if err := json.Unmarshal(body, &userInfo); err != nil {
return nil, fmt.Errorf("oidc: failed to decode userinfo: %v", err)
}
return &UserInfo{
Subject: userInfo.Subject,
Profile: userInfo.Profile,
Email: userInfo.Email,
EmailVerified: bool(userInfo.EmailVerified),
claims: body,
}, nil
}
// IDToken is an OpenID Connect extension that provides a predictable representation
// of an authorization event.
//
// The ID Token only holds fields OpenID Connect requires. To access additional
// claims returned by the server, use the Claims method.
type IDToken struct {
// The URL of the server which issued this token. OpenID Connect
// requires this value always be identical to the URL used for
// initial discovery.
//
// Note: Because of a known issue with Google Accounts' implementation
// this value may differ when using Google.
//
// See: https://developers.google.com/identity/protocols/OpenIDConnect#obtainuserinfo
Issuer string
// The client ID, or set of client IDs, that this token is issued for. For
// common uses, this is the client that initialized the auth flow.
//
// This package ensures the audience contains an expected value.
Audience []string
// A unique string which identifies the end user.
Subject string
// Expiry of the token. Ths package will not process tokens that have
// expired unless that validation is explicitly turned off.
Expiry time.Time
// When the token was issued by the provider.
IssuedAt time.Time
// Initial nonce provided during the authentication redirect.
//
// This package does NOT provided verification on the value of this field
// and it's the user's responsibility to ensure it contains a valid value.
Nonce string
// at_hash claim, if set in the ID token. Callers can verify an access token
// that corresponds to the ID token using the VerifyAccessToken method.
AccessTokenHash string
// signature algorithm used for ID token, needed to compute a verification hash of an
// access token
sigAlgorithm string
// Raw payload of the id_token.
claims []byte
// Map of distributed claim names to claim sources
distributedClaims map[string]claimSource
}
// Claims unmarshals the raw JSON payload of the ID Token into a provided struct.
//
// idToken, err := idTokenVerifier.Verify(rawIDToken)
// if err != nil {
// // handle error
// }
// var claims struct {
// Email string `json:"email"`
// EmailVerified bool `json:"email_verified"`
// }
// if err := idToken.Claims(&claims); err != nil {
// // handle error
// }
//
func (i *IDToken) Claims(v interface{}) error {
if i.claims == nil {
return errors.New("oidc: claims not set")
}
return json.Unmarshal(i.claims, v)
}
// VerifyAccessToken verifies that the hash of the access token that corresponds to the iD token
// matches the hash in the id token. It returns an error if the hashes don't match.
// It is the caller's responsibility to ensure that the optional access token hash is present for the ID token
// before calling this method. See https://openid.net/specs/openid-connect-core-1_0.html#CodeIDToken
func (i *IDToken) VerifyAccessToken(accessToken string) error {
if i.AccessTokenHash == "" {
return errNoAtHash
}
var h hash.Hash
switch i.sigAlgorithm {
case RS256, ES256, PS256:
h = sha256.New()
case RS384, ES384, PS384:
h = sha512.New384()
case RS512, ES512, PS512:
h = sha512.New()
default:
return fmt.Errorf("oidc: unsupported signing algorithm %q", i.sigAlgorithm)
}
h.Write([]byte(accessToken)) // hash documents that Write will never return an error
sum := h.Sum(nil)[:h.Size()/2]
actual := base64.RawURLEncoding.EncodeToString(sum)
if actual != i.AccessTokenHash {
return errInvalidAtHash
}
return nil
}
type idToken struct {
Issuer string `json:"iss"`
Subject string `json:"sub"`
Audience audience `json:"aud"`
Expiry jsonTime `json:"exp"`
IssuedAt jsonTime `json:"iat"`
NotBefore *jsonTime `json:"nbf"`
Nonce string `json:"nonce"`
AtHash string `json:"at_hash"`
ClaimNames map[string]string `json:"_claim_names"`
ClaimSources map[string]claimSource `json:"_claim_sources"`
}
type claimSource struct {
Endpoint string `json:"endpoint"`
AccessToken string `json:"access_token"`
}
type stringAsBool bool
func (sb *stringAsBool) UnmarshalJSON(b []byte) error {
switch string(b) {
case "true", `"true"`:
*sb = stringAsBool(true)
case "false", `"false"`:
*sb = stringAsBool(false)
default:
return errors.New("invalid value for boolean")
}
return nil
}
type audience []string
func (a *audience) UnmarshalJSON(b []byte) error {
var s string
if json.Unmarshal(b, &s) == nil {
*a = audience{s}
return nil
}
var auds []string
if err := json.Unmarshal(b, &auds); err != nil {
return err
}
*a = audience(auds)
return nil
}
type jsonTime time.Time
func (j *jsonTime) UnmarshalJSON(b []byte) error {
var n json.Number
if err := json.Unmarshal(b, &n); err != nil {
return err
}
var unix int64
if t, err := n.Int64(); err == nil {
unix = t
} else {
f, err := n.Float64()
if err != nil {
return err
}
unix = int64(f)
}
*j = jsonTime(time.Unix(unix, 0))
return nil
}
func unmarshalResp(r *http.Response, body []byte, v interface{}) error {
err := json.Unmarshal(body, &v)
if err == nil {
return nil
}
ct := r.Header.Get("Content-Type")
mediaType, _, parseErr := mime.ParseMediaType(ct)
if parseErr == nil && mediaType == "application/json" {
return fmt.Errorf("got Content-Type = application/json, but could not unmarshal as JSON: %v", err)
}
return fmt.Errorf("expected Content-Type = application/json, got %q: %v", ct, err)
}

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vendor/github.com/coreos/go-oidc/v3/oidc/verify.go generated vendored Normal file
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package oidc
import (
"bytes"
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"strings"
"time"
"golang.org/x/oauth2"
jose "gopkg.in/square/go-jose.v2"
)
const (
issuerGoogleAccounts = "https://accounts.google.com"
issuerGoogleAccountsNoScheme = "accounts.google.com"
)
// KeySet is a set of publc JSON Web Keys that can be used to validate the signature
// of JSON web tokens. This is expected to be backed by a remote key set through
// provider metadata discovery or an in-memory set of keys delivered out-of-band.
type KeySet interface {
// VerifySignature parses the JSON web token, verifies the signature, and returns
// the raw payload. Header and claim fields are validated by other parts of the
// package. For example, the KeySet does not need to check values such as signature
// algorithm, issuer, and audience since the IDTokenVerifier validates these values
// independently.
//
// If VerifySignature makes HTTP requests to verify the token, it's expected to
// use any HTTP client associated with the context through ClientContext.
VerifySignature(ctx context.Context, jwt string) (payload []byte, err error)
}
// IDTokenVerifier provides verification for ID Tokens.
type IDTokenVerifier struct {
keySet KeySet
config *Config
issuer string
}
// NewVerifier returns a verifier manually constructed from a key set and issuer URL.
//
// It's easier to use provider discovery to construct an IDTokenVerifier than creating
// one directly. This method is intended to be used with provider that don't support
// metadata discovery, or avoiding round trips when the key set URL is already known.
//
// This constructor can be used to create a verifier directly using the issuer URL and
// JSON Web Key Set URL without using discovery:
//
// keySet := oidc.NewRemoteKeySet(ctx, "https://www.googleapis.com/oauth2/v3/certs")
// verifier := oidc.NewVerifier("https://accounts.google.com", keySet, config)
//
// Since KeySet is an interface, this constructor can also be used to supply custom
// public key sources. For example, if a user wanted to supply public keys out-of-band
// and hold them statically in-memory:
//
// // Custom KeySet implementation.
// keySet := newStatisKeySet(publicKeys...)
//
// // Verifier uses the custom KeySet implementation.
// verifier := oidc.NewVerifier("https://auth.example.com", keySet, config)
//
func NewVerifier(issuerURL string, keySet KeySet, config *Config) *IDTokenVerifier {
return &IDTokenVerifier{keySet: keySet, config: config, issuer: issuerURL}
}
// Config is the configuration for an IDTokenVerifier.
type Config struct {
// Expected audience of the token. For a majority of the cases this is expected to be
// the ID of the client that initialized the login flow. It may occasionally differ if
// the provider supports the authorizing party (azp) claim.
//
// If not provided, users must explicitly set SkipClientIDCheck.
ClientID string
// If specified, only this set of algorithms may be used to sign the JWT.
//
// If the IDTokenVerifier is created from a provider with (*Provider).Verifier, this
// defaults to the set of algorithms the provider supports. Otherwise this values
// defaults to RS256.
SupportedSigningAlgs []string
// If true, no ClientID check performed. Must be true if ClientID field is empty.
SkipClientIDCheck bool
// If true, token expiry is not checked.
SkipExpiryCheck bool
// SkipIssuerCheck is intended for specialized cases where the the caller wishes to
// defer issuer validation. When enabled, callers MUST independently verify the Token's
// Issuer is a known good value.
//
// Mismatched issuers often indicate client mis-configuration. If mismatches are
// unexpected, evaluate if the provided issuer URL is incorrect instead of enabling
// this option.
SkipIssuerCheck bool
// Time function to check Token expiry. Defaults to time.Now
Now func() time.Time
}
// Verifier returns an IDTokenVerifier that uses the provider's key set to verify JWTs.
//
// The returned IDTokenVerifier is tied to the Provider's context and its behavior is
// undefined once the Provider's context is canceled.
func (p *Provider) Verifier(config *Config) *IDTokenVerifier {
if len(config.SupportedSigningAlgs) == 0 && len(p.algorithms) > 0 {
// Make a copy so we don't modify the config values.
cp := &Config{}
*cp = *config
cp.SupportedSigningAlgs = p.algorithms
config = cp
}
return NewVerifier(p.issuer, p.remoteKeySet, config)
}
func parseJWT(p string) ([]byte, error) {
parts := strings.Split(p, ".")
if len(parts) < 2 {
return nil, fmt.Errorf("oidc: malformed jwt, expected 3 parts got %d", len(parts))
}
payload, err := base64.RawURLEncoding.DecodeString(parts[1])
if err != nil {
return nil, fmt.Errorf("oidc: malformed jwt payload: %v", err)
}
return payload, nil
}
func contains(sli []string, ele string) bool {
for _, s := range sli {
if s == ele {
return true
}
}
return false
}
// Returns the Claims from the distributed JWT token
func resolveDistributedClaim(ctx context.Context, verifier *IDTokenVerifier, src claimSource) ([]byte, error) {
req, err := http.NewRequest("GET", src.Endpoint, nil)
if err != nil {
return nil, fmt.Errorf("malformed request: %v", err)
}
if src.AccessToken != "" {
req.Header.Set("Authorization", "Bearer "+src.AccessToken)
}
resp, err := doRequest(ctx, req)
if err != nil {
return nil, fmt.Errorf("oidc: Request to endpoint failed: %v", err)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("unable to read response body: %v", err)
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("oidc: request failed: %v", resp.StatusCode)
}
token, err := verifier.Verify(ctx, string(body))
if err != nil {
return nil, fmt.Errorf("malformed response body: %v", err)
}
return token.claims, nil
}
func parseClaim(raw []byte, name string, v interface{}) error {
var parsed map[string]json.RawMessage
if err := json.Unmarshal(raw, &parsed); err != nil {
return err
}
val, ok := parsed[name]
if !ok {
return fmt.Errorf("claim doesn't exist: %s", name)
}
return json.Unmarshal([]byte(val), v)
}
// Verify parses a raw ID Token, verifies it's been signed by the provider, performs
// any additional checks depending on the Config, and returns the payload.
//
// Verify does NOT do nonce validation, which is the callers responsibility.
//
// See: https://openid.net/specs/openid-connect-core-1_0.html#IDTokenValidation
//
// oauth2Token, err := oauth2Config.Exchange(ctx, r.URL.Query().Get("code"))
// if err != nil {
// // handle error
// }
//
// // Extract the ID Token from oauth2 token.
// rawIDToken, ok := oauth2Token.Extra("id_token").(string)
// if !ok {
// // handle error
// }
//
// token, err := verifier.Verify(ctx, rawIDToken)
//
func (v *IDTokenVerifier) Verify(ctx context.Context, rawIDToken string) (*IDToken, error) {
jws, err := jose.ParseSigned(rawIDToken)
if err != nil {
return nil, fmt.Errorf("oidc: malformed jwt: %v", err)
}
// Throw out tokens with invalid claims before trying to verify the token. This lets
// us do cheap checks before possibly re-syncing keys.
payload, err := parseJWT(rawIDToken)
if err != nil {
return nil, fmt.Errorf("oidc: malformed jwt: %v", err)
}
var token idToken
if err := json.Unmarshal(payload, &token); err != nil {
return nil, fmt.Errorf("oidc: failed to unmarshal claims: %v", err)
}
distributedClaims := make(map[string]claimSource)
//step through the token to map claim names to claim sources"
for cn, src := range token.ClaimNames {
if src == "" {
return nil, fmt.Errorf("oidc: failed to obtain source from claim name")
}
s, ok := token.ClaimSources[src]
if !ok {
return nil, fmt.Errorf("oidc: source does not exist")
}
distributedClaims[cn] = s
}
t := &IDToken{
Issuer: token.Issuer,
Subject: token.Subject,
Audience: []string(token.Audience),
Expiry: time.Time(token.Expiry),
IssuedAt: time.Time(token.IssuedAt),
Nonce: token.Nonce,
AccessTokenHash: token.AtHash,
claims: payload,
distributedClaims: distributedClaims,
}
// Check issuer.
if !v.config.SkipIssuerCheck && t.Issuer != v.issuer {
// Google sometimes returns "accounts.google.com" as the issuer claim instead of
// the required "https://accounts.google.com". Detect this case and allow it only
// for Google.
//
// We will not add hooks to let other providers go off spec like this.
if !(v.issuer == issuerGoogleAccounts && t.Issuer == issuerGoogleAccountsNoScheme) {
return nil, fmt.Errorf("oidc: id token issued by a different provider, expected %q got %q", v.issuer, t.Issuer)
}
}
// If a client ID has been provided, make sure it's part of the audience. SkipClientIDCheck must be true if ClientID is empty.
//
// This check DOES NOT ensure that the ClientID is the party to which the ID Token was issued (i.e. Authorized party).
if !v.config.SkipClientIDCheck {
if v.config.ClientID != "" {
if !contains(t.Audience, v.config.ClientID) {
return nil, fmt.Errorf("oidc: expected audience %q got %q", v.config.ClientID, t.Audience)
}
} else {
return nil, fmt.Errorf("oidc: invalid configuration, clientID must be provided or SkipClientIDCheck must be set")
}
}
// If a SkipExpiryCheck is false, make sure token is not expired.
if !v.config.SkipExpiryCheck {
now := time.Now
if v.config.Now != nil {
now = v.config.Now
}
nowTime := now()
if t.Expiry.Before(nowTime) {
return nil, fmt.Errorf("oidc: token is expired (Token Expiry: %v)", t.Expiry)
}
// If nbf claim is provided in token, ensure that it is indeed in the past.
if token.NotBefore != nil {
nbfTime := time.Time(*token.NotBefore)
leeway := 1 * time.Minute
if nowTime.Add(leeway).Before(nbfTime) {
return nil, fmt.Errorf("oidc: current time %v before the nbf (not before) time: %v", nowTime, nbfTime)
}
}
}
switch len(jws.Signatures) {
case 0:
return nil, fmt.Errorf("oidc: id token not signed")
case 1:
default:
return nil, fmt.Errorf("oidc: multiple signatures on id token not supported")
}
sig := jws.Signatures[0]
supportedSigAlgs := v.config.SupportedSigningAlgs
if len(supportedSigAlgs) == 0 {
supportedSigAlgs = []string{RS256}
}
if !contains(supportedSigAlgs, sig.Header.Algorithm) {
return nil, fmt.Errorf("oidc: id token signed with unsupported algorithm, expected %q got %q", supportedSigAlgs, sig.Header.Algorithm)
}
t.sigAlgorithm = sig.Header.Algorithm
gotPayload, err := v.keySet.VerifySignature(ctx, rawIDToken)
if err != nil {
return nil, fmt.Errorf("failed to verify signature: %v", err)
}
// Ensure that the payload returned by the square actually matches the payload parsed earlier.
if !bytes.Equal(gotPayload, payload) {
return nil, errors.New("oidc: internal error, payload parsed did not match previous payload")
}
return t, nil
}
// Nonce returns an auth code option which requires the ID Token created by the
// OpenID Connect provider to contain the specified nonce.
func Nonce(nonce string) oauth2.AuthCodeOption {
return oauth2.SetAuthURLParam("nonce", nonce)
}

21
vendor/github.com/cpuguy83/go-md2man/v2/LICENSE.md generated vendored Normal file
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The MIT License (MIT)
Copyright (c) 2014 Brian Goff
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

14
vendor/github.com/cpuguy83/go-md2man/v2/md2man/md2man.go generated vendored Normal file
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package md2man
import (
"github.com/russross/blackfriday/v2"
)
// Render converts a markdown document into a roff formatted document.
func Render(doc []byte) []byte {
renderer := NewRoffRenderer()
return blackfriday.Run(doc,
[]blackfriday.Option{blackfriday.WithRenderer(renderer),
blackfriday.WithExtensions(renderer.GetExtensions())}...)
}

336
vendor/github.com/cpuguy83/go-md2man/v2/md2man/roff.go generated vendored Normal file
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package md2man
import (
"fmt"
"io"
"os"
"strings"
"github.com/russross/blackfriday/v2"
)
// roffRenderer implements the blackfriday.Renderer interface for creating
// roff format (manpages) from markdown text
type roffRenderer struct {
extensions blackfriday.Extensions
listCounters []int
firstHeader bool
firstDD bool
listDepth int
}
const (
titleHeader = ".TH "
topLevelHeader = "\n\n.SH "
secondLevelHdr = "\n.SH "
otherHeader = "\n.SS "
crTag = "\n"
emphTag = "\\fI"
emphCloseTag = "\\fP"
strongTag = "\\fB"
strongCloseTag = "\\fP"
breakTag = "\n.br\n"
paraTag = "\n.PP\n"
hruleTag = "\n.ti 0\n\\l'\\n(.lu'\n"
linkTag = "\n\\[la]"
linkCloseTag = "\\[ra]"
codespanTag = "\\fB\\fC"
codespanCloseTag = "\\fR"
codeTag = "\n.PP\n.RS\n\n.nf\n"
codeCloseTag = "\n.fi\n.RE\n"
quoteTag = "\n.PP\n.RS\n"
quoteCloseTag = "\n.RE\n"
listTag = "\n.RS\n"
listCloseTag = "\n.RE\n"
dtTag = "\n.TP\n"
dd2Tag = "\n"
tableStart = "\n.TS\nallbox;\n"
tableEnd = ".TE\n"
tableCellStart = "T{\n"
tableCellEnd = "\nT}\n"
)
// NewRoffRenderer creates a new blackfriday Renderer for generating roff documents
// from markdown
func NewRoffRenderer() *roffRenderer { // nolint: golint
var extensions blackfriday.Extensions
extensions |= blackfriday.NoIntraEmphasis
extensions |= blackfriday.Tables
extensions |= blackfriday.FencedCode
extensions |= blackfriday.SpaceHeadings
extensions |= blackfriday.Footnotes
extensions |= blackfriday.Titleblock
extensions |= blackfriday.DefinitionLists
return &roffRenderer{
extensions: extensions,
}
}
// GetExtensions returns the list of extensions used by this renderer implementation
func (r *roffRenderer) GetExtensions() blackfriday.Extensions {
return r.extensions
}
// RenderHeader handles outputting the header at document start
func (r *roffRenderer) RenderHeader(w io.Writer, ast *blackfriday.Node) {
// disable hyphenation
out(w, ".nh\n")
}
// RenderFooter handles outputting the footer at the document end; the roff
// renderer has no footer information
func (r *roffRenderer) RenderFooter(w io.Writer, ast *blackfriday.Node) {
}
// RenderNode is called for each node in a markdown document; based on the node
// type the equivalent roff output is sent to the writer
func (r *roffRenderer) RenderNode(w io.Writer, node *blackfriday.Node, entering bool) blackfriday.WalkStatus {
var walkAction = blackfriday.GoToNext
switch node.Type {
case blackfriday.Text:
escapeSpecialChars(w, node.Literal)
case blackfriday.Softbreak:
out(w, crTag)
case blackfriday.Hardbreak:
out(w, breakTag)
case blackfriday.Emph:
if entering {
out(w, emphTag)
} else {
out(w, emphCloseTag)
}
case blackfriday.Strong:
if entering {
out(w, strongTag)
} else {
out(w, strongCloseTag)
}
case blackfriday.Link:
if !entering {
out(w, linkTag+string(node.LinkData.Destination)+linkCloseTag)
}
case blackfriday.Image:
// ignore images
walkAction = blackfriday.SkipChildren
case blackfriday.Code:
out(w, codespanTag)
escapeSpecialChars(w, node.Literal)
out(w, codespanCloseTag)
case blackfriday.Document:
break
case blackfriday.Paragraph:
// roff .PP markers break lists
if r.listDepth > 0 {
return blackfriday.GoToNext
}
if entering {
out(w, paraTag)
} else {
out(w, crTag)
}
case blackfriday.BlockQuote:
if entering {
out(w, quoteTag)
} else {
out(w, quoteCloseTag)
}
case blackfriday.Heading:
r.handleHeading(w, node, entering)
case blackfriday.HorizontalRule:
out(w, hruleTag)
case blackfriday.List:
r.handleList(w, node, entering)
case blackfriday.Item:
r.handleItem(w, node, entering)
case blackfriday.CodeBlock:
out(w, codeTag)
escapeSpecialChars(w, node.Literal)
out(w, codeCloseTag)
case blackfriday.Table:
r.handleTable(w, node, entering)
case blackfriday.TableHead:
case blackfriday.TableBody:
case blackfriday.TableRow:
// no action as cell entries do all the nroff formatting
return blackfriday.GoToNext
case blackfriday.TableCell:
r.handleTableCell(w, node, entering)
case blackfriday.HTMLSpan:
// ignore other HTML tags
default:
fmt.Fprintln(os.Stderr, "WARNING: go-md2man does not handle node type "+node.Type.String())
}
return walkAction
}
func (r *roffRenderer) handleHeading(w io.Writer, node *blackfriday.Node, entering bool) {
if entering {
switch node.Level {
case 1:
if !r.firstHeader {
out(w, titleHeader)
r.firstHeader = true
break
}
out(w, topLevelHeader)
case 2:
out(w, secondLevelHdr)
default:
out(w, otherHeader)
}
}
}
func (r *roffRenderer) handleList(w io.Writer, node *blackfriday.Node, entering bool) {
openTag := listTag
closeTag := listCloseTag
if node.ListFlags&blackfriday.ListTypeDefinition != 0 {
// tags for definition lists handled within Item node
openTag = ""
closeTag = ""
}
if entering {
r.listDepth++
if node.ListFlags&blackfriday.ListTypeOrdered != 0 {
r.listCounters = append(r.listCounters, 1)
}
out(w, openTag)
} else {
if node.ListFlags&blackfriday.ListTypeOrdered != 0 {
r.listCounters = r.listCounters[:len(r.listCounters)-1]
}
out(w, closeTag)
r.listDepth--
}
}
func (r *roffRenderer) handleItem(w io.Writer, node *blackfriday.Node, entering bool) {
if entering {
if node.ListFlags&blackfriday.ListTypeOrdered != 0 {
out(w, fmt.Sprintf(".IP \"%3d.\" 5\n", r.listCounters[len(r.listCounters)-1]))
r.listCounters[len(r.listCounters)-1]++
} else if node.ListFlags&blackfriday.ListTypeTerm != 0 {
// DT (definition term): line just before DD (see below).
out(w, dtTag)
r.firstDD = true
} else if node.ListFlags&blackfriday.ListTypeDefinition != 0 {
// DD (definition description): line that starts with ": ".
//
// We have to distinguish between the first DD and the
// subsequent ones, as there should be no vertical
// whitespace between the DT and the first DD.
if r.firstDD {
r.firstDD = false
} else {
out(w, dd2Tag)
}
} else {
out(w, ".IP \\(bu 2\n")
}
} else {
out(w, "\n")
}
}
func (r *roffRenderer) handleTable(w io.Writer, node *blackfriday.Node, entering bool) {
if entering {
out(w, tableStart)
// call walker to count cells (and rows?) so format section can be produced
columns := countColumns(node)
out(w, strings.Repeat("l ", columns)+"\n")
out(w, strings.Repeat("l ", columns)+".\n")
} else {
out(w, tableEnd)
}
}
func (r *roffRenderer) handleTableCell(w io.Writer, node *blackfriday.Node, entering bool) {
if entering {
var start string
if node.Prev != nil && node.Prev.Type == blackfriday.TableCell {
start = "\t"
}
if node.IsHeader {
start += codespanTag
} else if nodeLiteralSize(node) > 30 {
start += tableCellStart
}
out(w, start)
} else {
var end string
if node.IsHeader {
end = codespanCloseTag
} else if nodeLiteralSize(node) > 30 {
end = tableCellEnd
}
if node.Next == nil && end != tableCellEnd {
// Last cell: need to carriage return if we are at the end of the
// header row and content isn't wrapped in a "tablecell"
end += crTag
}
out(w, end)
}
}
func nodeLiteralSize(node *blackfriday.Node) int {
total := 0
for n := node.FirstChild; n != nil; n = n.FirstChild {
total += len(n.Literal)
}
return total
}
// because roff format requires knowing the column count before outputting any table
// data we need to walk a table tree and count the columns
func countColumns(node *blackfriday.Node) int {
var columns int
node.Walk(func(node *blackfriday.Node, entering bool) blackfriday.WalkStatus {
switch node.Type {
case blackfriday.TableRow:
if !entering {
return blackfriday.Terminate
}
case blackfriday.TableCell:
if entering {
columns++
}
default:
}
return blackfriday.GoToNext
})
return columns
}
func out(w io.Writer, output string) {
io.WriteString(w, output) // nolint: errcheck
}
func escapeSpecialChars(w io.Writer, text []byte) {
for i := 0; i < len(text); i++ {
// escape initial apostrophe or period
if len(text) >= 1 && (text[0] == '\'' || text[0] == '.') {
out(w, "\\&")
}
// directly copy normal characters
org := i
for i < len(text) && text[i] != '\\' {
i++
}
if i > org {
w.Write(text[org:i]) // nolint: errcheck
}
// escape a character
if i >= len(text) {
break
}
w.Write([]byte{'\\', text[i]}) // nolint: errcheck
}
}

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ISC License
Copyright (c) 2012-2016 Dave Collins <dave@davec.name>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

145
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// Copyright (c) 2015-2016 Dave Collins <dave@davec.name>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
// NOTE: Due to the following build constraints, this file will only be compiled
// when the code is not running on Google App Engine, compiled by GopherJS, and
// "-tags safe" is not added to the go build command line. The "disableunsafe"
// tag is deprecated and thus should not be used.
// Go versions prior to 1.4 are disabled because they use a different layout
// for interfaces which make the implementation of unsafeReflectValue more complex.
// +build !js,!appengine,!safe,!disableunsafe,go1.4
package spew
import (
"reflect"
"unsafe"
)
const (
// UnsafeDisabled is a build-time constant which specifies whether or
// not access to the unsafe package is available.
UnsafeDisabled = false
// ptrSize is the size of a pointer on the current arch.
ptrSize = unsafe.Sizeof((*byte)(nil))
)
type flag uintptr
var (
// flagRO indicates whether the value field of a reflect.Value
// is read-only.
flagRO flag
// flagAddr indicates whether the address of the reflect.Value's
// value may be taken.
flagAddr flag
)
// flagKindMask holds the bits that make up the kind
// part of the flags field. In all the supported versions,
// it is in the lower 5 bits.
const flagKindMask = flag(0x1f)
// Different versions of Go have used different
// bit layouts for the flags type. This table
// records the known combinations.
var okFlags = []struct {
ro, addr flag
}{{
// From Go 1.4 to 1.5
ro: 1 << 5,
addr: 1 << 7,
}, {
// Up to Go tip.
ro: 1<<5 | 1<<6,
addr: 1 << 8,
}}
var flagValOffset = func() uintptr {
field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag")
if !ok {
panic("reflect.Value has no flag field")
}
return field.Offset
}()
// flagField returns a pointer to the flag field of a reflect.Value.
func flagField(v *reflect.Value) *flag {
return (*flag)(unsafe.Pointer(uintptr(unsafe.Pointer(v)) + flagValOffset))
}
// unsafeReflectValue converts the passed reflect.Value into a one that bypasses
// the typical safety restrictions preventing access to unaddressable and
// unexported data. It works by digging the raw pointer to the underlying
// value out of the protected value and generating a new unprotected (unsafe)
// reflect.Value to it.
//
// This allows us to check for implementations of the Stringer and error
// interfaces to be used for pretty printing ordinarily unaddressable and
// inaccessible values such as unexported struct fields.
func unsafeReflectValue(v reflect.Value) reflect.Value {
if !v.IsValid() || (v.CanInterface() && v.CanAddr()) {
return v
}
flagFieldPtr := flagField(&v)
*flagFieldPtr &^= flagRO
*flagFieldPtr |= flagAddr
return v
}
// Sanity checks against future reflect package changes
// to the type or semantics of the Value.flag field.
func init() {
field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag")
if !ok {
panic("reflect.Value has no flag field")
}
if field.Type.Kind() != reflect.TypeOf(flag(0)).Kind() {
panic("reflect.Value flag field has changed kind")
}
type t0 int
var t struct {
A t0
// t0 will have flagEmbedRO set.
t0
// a will have flagStickyRO set
a t0
}
vA := reflect.ValueOf(t).FieldByName("A")
va := reflect.ValueOf(t).FieldByName("a")
vt0 := reflect.ValueOf(t).FieldByName("t0")
// Infer flagRO from the difference between the flags
// for the (otherwise identical) fields in t.
flagPublic := *flagField(&vA)
flagWithRO := *flagField(&va) | *flagField(&vt0)
flagRO = flagPublic ^ flagWithRO
// Infer flagAddr from the difference between a value
// taken from a pointer and not.
vPtrA := reflect.ValueOf(&t).Elem().FieldByName("A")
flagNoPtr := *flagField(&vA)
flagPtr := *flagField(&vPtrA)
flagAddr = flagNoPtr ^ flagPtr
// Check that the inferred flags tally with one of the known versions.
for _, f := range okFlags {
if flagRO == f.ro && flagAddr == f.addr {
return
}
}
panic("reflect.Value read-only flag has changed semantics")
}

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// Copyright (c) 2015-2016 Dave Collins <dave@davec.name>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
// NOTE: Due to the following build constraints, this file will only be compiled
// when the code is running on Google App Engine, compiled by GopherJS, or
// "-tags safe" is added to the go build command line. The "disableunsafe"
// tag is deprecated and thus should not be used.
// +build js appengine safe disableunsafe !go1.4
package spew
import "reflect"
const (
// UnsafeDisabled is a build-time constant which specifies whether or
// not access to the unsafe package is available.
UnsafeDisabled = true
)
// unsafeReflectValue typically converts the passed reflect.Value into a one
// that bypasses the typical safety restrictions preventing access to
// unaddressable and unexported data. However, doing this relies on access to
// the unsafe package. This is a stub version which simply returns the passed
// reflect.Value when the unsafe package is not available.
func unsafeReflectValue(v reflect.Value) reflect.Value {
return v
}

341
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/*
* Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package spew
import (
"bytes"
"fmt"
"io"
"reflect"
"sort"
"strconv"
)
// Some constants in the form of bytes to avoid string overhead. This mirrors
// the technique used in the fmt package.
var (
panicBytes = []byte("(PANIC=")
plusBytes = []byte("+")
iBytes = []byte("i")
trueBytes = []byte("true")
falseBytes = []byte("false")
interfaceBytes = []byte("(interface {})")
commaNewlineBytes = []byte(",\n")
newlineBytes = []byte("\n")
openBraceBytes = []byte("{")
openBraceNewlineBytes = []byte("{\n")
closeBraceBytes = []byte("}")
asteriskBytes = []byte("*")
colonBytes = []byte(":")
colonSpaceBytes = []byte(": ")
openParenBytes = []byte("(")
closeParenBytes = []byte(")")
spaceBytes = []byte(" ")
pointerChainBytes = []byte("->")
nilAngleBytes = []byte("<nil>")
maxNewlineBytes = []byte("<max depth reached>\n")
maxShortBytes = []byte("<max>")
circularBytes = []byte("<already shown>")
circularShortBytes = []byte("<shown>")
invalidAngleBytes = []byte("<invalid>")
openBracketBytes = []byte("[")
closeBracketBytes = []byte("]")
percentBytes = []byte("%")
precisionBytes = []byte(".")
openAngleBytes = []byte("<")
closeAngleBytes = []byte(">")
openMapBytes = []byte("map[")
closeMapBytes = []byte("]")
lenEqualsBytes = []byte("len=")
capEqualsBytes = []byte("cap=")
)
// hexDigits is used to map a decimal value to a hex digit.
var hexDigits = "0123456789abcdef"
// catchPanic handles any panics that might occur during the handleMethods
// calls.
func catchPanic(w io.Writer, v reflect.Value) {
if err := recover(); err != nil {
w.Write(panicBytes)
fmt.Fprintf(w, "%v", err)
w.Write(closeParenBytes)
}
}
// handleMethods attempts to call the Error and String methods on the underlying
// type the passed reflect.Value represents and outputes the result to Writer w.
//
// It handles panics in any called methods by catching and displaying the error
// as the formatted value.
func handleMethods(cs *ConfigState, w io.Writer, v reflect.Value) (handled bool) {
// We need an interface to check if the type implements the error or
// Stringer interface. However, the reflect package won't give us an
// interface on certain things like unexported struct fields in order
// to enforce visibility rules. We use unsafe, when it's available,
// to bypass these restrictions since this package does not mutate the
// values.
if !v.CanInterface() {
if UnsafeDisabled {
return false
}
v = unsafeReflectValue(v)
}
// Choose whether or not to do error and Stringer interface lookups against
// the base type or a pointer to the base type depending on settings.
// Technically calling one of these methods with a pointer receiver can
// mutate the value, however, types which choose to satisify an error or
// Stringer interface with a pointer receiver should not be mutating their
// state inside these interface methods.
if !cs.DisablePointerMethods && !UnsafeDisabled && !v.CanAddr() {
v = unsafeReflectValue(v)
}
if v.CanAddr() {
v = v.Addr()
}
// Is it an error or Stringer?
switch iface := v.Interface().(type) {
case error:
defer catchPanic(w, v)
if cs.ContinueOnMethod {
w.Write(openParenBytes)
w.Write([]byte(iface.Error()))
w.Write(closeParenBytes)
w.Write(spaceBytes)
return false
}
w.Write([]byte(iface.Error()))
return true
case fmt.Stringer:
defer catchPanic(w, v)
if cs.ContinueOnMethod {
w.Write(openParenBytes)
w.Write([]byte(iface.String()))
w.Write(closeParenBytes)
w.Write(spaceBytes)
return false
}
w.Write([]byte(iface.String()))
return true
}
return false
}
// printBool outputs a boolean value as true or false to Writer w.
func printBool(w io.Writer, val bool) {
if val {
w.Write(trueBytes)
} else {
w.Write(falseBytes)
}
}
// printInt outputs a signed integer value to Writer w.
func printInt(w io.Writer, val int64, base int) {
w.Write([]byte(strconv.FormatInt(val, base)))
}
// printUint outputs an unsigned integer value to Writer w.
func printUint(w io.Writer, val uint64, base int) {
w.Write([]byte(strconv.FormatUint(val, base)))
}
// printFloat outputs a floating point value using the specified precision,
// which is expected to be 32 or 64bit, to Writer w.
func printFloat(w io.Writer, val float64, precision int) {
w.Write([]byte(strconv.FormatFloat(val, 'g', -1, precision)))
}
// printComplex outputs a complex value using the specified float precision
// for the real and imaginary parts to Writer w.
func printComplex(w io.Writer, c complex128, floatPrecision int) {
r := real(c)
w.Write(openParenBytes)
w.Write([]byte(strconv.FormatFloat(r, 'g', -1, floatPrecision)))
i := imag(c)
if i >= 0 {
w.Write(plusBytes)
}
w.Write([]byte(strconv.FormatFloat(i, 'g', -1, floatPrecision)))
w.Write(iBytes)
w.Write(closeParenBytes)
}
// printHexPtr outputs a uintptr formatted as hexadecimal with a leading '0x'
// prefix to Writer w.
func printHexPtr(w io.Writer, p uintptr) {
// Null pointer.
num := uint64(p)
if num == 0 {
w.Write(nilAngleBytes)
return
}
// Max uint64 is 16 bytes in hex + 2 bytes for '0x' prefix
buf := make([]byte, 18)
// It's simpler to construct the hex string right to left.
base := uint64(16)
i := len(buf) - 1
for num >= base {
buf[i] = hexDigits[num%base]
num /= base
i--
}
buf[i] = hexDigits[num]
// Add '0x' prefix.
i--
buf[i] = 'x'
i--
buf[i] = '0'
// Strip unused leading bytes.
buf = buf[i:]
w.Write(buf)
}
// valuesSorter implements sort.Interface to allow a slice of reflect.Value
// elements to be sorted.
type valuesSorter struct {
values []reflect.Value
strings []string // either nil or same len and values
cs *ConfigState
}
// newValuesSorter initializes a valuesSorter instance, which holds a set of
// surrogate keys on which the data should be sorted. It uses flags in
// ConfigState to decide if and how to populate those surrogate keys.
func newValuesSorter(values []reflect.Value, cs *ConfigState) sort.Interface {
vs := &valuesSorter{values: values, cs: cs}
if canSortSimply(vs.values[0].Kind()) {
return vs
}
if !cs.DisableMethods {
vs.strings = make([]string, len(values))
for i := range vs.values {
b := bytes.Buffer{}
if !handleMethods(cs, &b, vs.values[i]) {
vs.strings = nil
break
}
vs.strings[i] = b.String()
}
}
if vs.strings == nil && cs.SpewKeys {
vs.strings = make([]string, len(values))
for i := range vs.values {
vs.strings[i] = Sprintf("%#v", vs.values[i].Interface())
}
}
return vs
}
// canSortSimply tests whether a reflect.Kind is a primitive that can be sorted
// directly, or whether it should be considered for sorting by surrogate keys
// (if the ConfigState allows it).
func canSortSimply(kind reflect.Kind) bool {
// This switch parallels valueSortLess, except for the default case.
switch kind {
case reflect.Bool:
return true
case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
return true
case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
return true
case reflect.Float32, reflect.Float64:
return true
case reflect.String:
return true
case reflect.Uintptr:
return true
case reflect.Array:
return true
}
return false
}
// Len returns the number of values in the slice. It is part of the
// sort.Interface implementation.
func (s *valuesSorter) Len() int {
return len(s.values)
}
// Swap swaps the values at the passed indices. It is part of the
// sort.Interface implementation.
func (s *valuesSorter) Swap(i, j int) {
s.values[i], s.values[j] = s.values[j], s.values[i]
if s.strings != nil {
s.strings[i], s.strings[j] = s.strings[j], s.strings[i]
}
}
// valueSortLess returns whether the first value should sort before the second
// value. It is used by valueSorter.Less as part of the sort.Interface
// implementation.
func valueSortLess(a, b reflect.Value) bool {
switch a.Kind() {
case reflect.Bool:
return !a.Bool() && b.Bool()
case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
return a.Int() < b.Int()
case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
return a.Uint() < b.Uint()
case reflect.Float32, reflect.Float64:
return a.Float() < b.Float()
case reflect.String:
return a.String() < b.String()
case reflect.Uintptr:
return a.Uint() < b.Uint()
case reflect.Array:
// Compare the contents of both arrays.
l := a.Len()
for i := 0; i < l; i++ {
av := a.Index(i)
bv := b.Index(i)
if av.Interface() == bv.Interface() {
continue
}
return valueSortLess(av, bv)
}
}
return a.String() < b.String()
}
// Less returns whether the value at index i should sort before the
// value at index j. It is part of the sort.Interface implementation.
func (s *valuesSorter) Less(i, j int) bool {
if s.strings == nil {
return valueSortLess(s.values[i], s.values[j])
}
return s.strings[i] < s.strings[j]
}
// sortValues is a sort function that handles both native types and any type that
// can be converted to error or Stringer. Other inputs are sorted according to
// their Value.String() value to ensure display stability.
func sortValues(values []reflect.Value, cs *ConfigState) {
if len(values) == 0 {
return
}
sort.Sort(newValuesSorter(values, cs))
}

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/*
* Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package spew
import (
"bytes"
"fmt"
"io"
"os"
)
// ConfigState houses the configuration options used by spew to format and
// display values. There is a global instance, Config, that is used to control
// all top-level Formatter and Dump functionality. Each ConfigState instance
// provides methods equivalent to the top-level functions.
//
// The zero value for ConfigState provides no indentation. You would typically
// want to set it to a space or a tab.
//
// Alternatively, you can use NewDefaultConfig to get a ConfigState instance
// with default settings. See the documentation of NewDefaultConfig for default
// values.
type ConfigState struct {
// Indent specifies the string to use for each indentation level. The
// global config instance that all top-level functions use set this to a
// single space by default. If you would like more indentation, you might
// set this to a tab with "\t" or perhaps two spaces with " ".
Indent string
// MaxDepth controls the maximum number of levels to descend into nested
// data structures. The default, 0, means there is no limit.
//
// NOTE: Circular data structures are properly detected, so it is not
// necessary to set this value unless you specifically want to limit deeply
// nested data structures.
MaxDepth int
// DisableMethods specifies whether or not error and Stringer interfaces are
// invoked for types that implement them.
DisableMethods bool
// DisablePointerMethods specifies whether or not to check for and invoke
// error and Stringer interfaces on types which only accept a pointer
// receiver when the current type is not a pointer.
//
// NOTE: This might be an unsafe action since calling one of these methods
// with a pointer receiver could technically mutate the value, however,
// in practice, types which choose to satisify an error or Stringer
// interface with a pointer receiver should not be mutating their state
// inside these interface methods. As a result, this option relies on
// access to the unsafe package, so it will not have any effect when
// running in environments without access to the unsafe package such as
// Google App Engine or with the "safe" build tag specified.
DisablePointerMethods bool
// DisablePointerAddresses specifies whether to disable the printing of
// pointer addresses. This is useful when diffing data structures in tests.
DisablePointerAddresses bool
// DisableCapacities specifies whether to disable the printing of capacities
// for arrays, slices, maps and channels. This is useful when diffing
// data structures in tests.
DisableCapacities bool
// ContinueOnMethod specifies whether or not recursion should continue once
// a custom error or Stringer interface is invoked. The default, false,
// means it will print the results of invoking the custom error or Stringer
// interface and return immediately instead of continuing to recurse into
// the internals of the data type.
//
// NOTE: This flag does not have any effect if method invocation is disabled
// via the DisableMethods or DisablePointerMethods options.
ContinueOnMethod bool
// SortKeys specifies map keys should be sorted before being printed. Use
// this to have a more deterministic, diffable output. Note that only
// native types (bool, int, uint, floats, uintptr and string) and types
// that support the error or Stringer interfaces (if methods are
// enabled) are supported, with other types sorted according to the
// reflect.Value.String() output which guarantees display stability.
SortKeys bool
// SpewKeys specifies that, as a last resort attempt, map keys should
// be spewed to strings and sorted by those strings. This is only
// considered if SortKeys is true.
SpewKeys bool
}
// Config is the active configuration of the top-level functions.
// The configuration can be changed by modifying the contents of spew.Config.
var Config = ConfigState{Indent: " "}
// Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
// passed with a Formatter interface returned by c.NewFormatter. It returns
// the formatted string as a value that satisfies error. See NewFormatter
// for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Errorf(format, c.NewFormatter(a), c.NewFormatter(b))
func (c *ConfigState) Errorf(format string, a ...interface{}) (err error) {
return fmt.Errorf(format, c.convertArgs(a)...)
}
// Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
// passed with a Formatter interface returned by c.NewFormatter. It returns
// the number of bytes written and any write error encountered. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Fprint(w, c.NewFormatter(a), c.NewFormatter(b))
func (c *ConfigState) Fprint(w io.Writer, a ...interface{}) (n int, err error) {
return fmt.Fprint(w, c.convertArgs(a)...)
}
// Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
// passed with a Formatter interface returned by c.NewFormatter. It returns
// the number of bytes written and any write error encountered. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Fprintf(w, format, c.NewFormatter(a), c.NewFormatter(b))
func (c *ConfigState) Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
return fmt.Fprintf(w, format, c.convertArgs(a)...)
}
// Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
// passed with a Formatter interface returned by c.NewFormatter. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Fprintln(w, c.NewFormatter(a), c.NewFormatter(b))
func (c *ConfigState) Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
return fmt.Fprintln(w, c.convertArgs(a)...)
}
// Print is a wrapper for fmt.Print that treats each argument as if it were
// passed with a Formatter interface returned by c.NewFormatter. It returns
// the number of bytes written and any write error encountered. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Print(c.NewFormatter(a), c.NewFormatter(b))
func (c *ConfigState) Print(a ...interface{}) (n int, err error) {
return fmt.Print(c.convertArgs(a)...)
}
// Printf is a wrapper for fmt.Printf that treats each argument as if it were
// passed with a Formatter interface returned by c.NewFormatter. It returns
// the number of bytes written and any write error encountered. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Printf(format, c.NewFormatter(a), c.NewFormatter(b))
func (c *ConfigState) Printf(format string, a ...interface{}) (n int, err error) {
return fmt.Printf(format, c.convertArgs(a)...)
}
// Println is a wrapper for fmt.Println that treats each argument as if it were
// passed with a Formatter interface returned by c.NewFormatter. It returns
// the number of bytes written and any write error encountered. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Println(c.NewFormatter(a), c.NewFormatter(b))
func (c *ConfigState) Println(a ...interface{}) (n int, err error) {
return fmt.Println(c.convertArgs(a)...)
}
// Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
// passed with a Formatter interface returned by c.NewFormatter. It returns
// the resulting string. See NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Sprint(c.NewFormatter(a), c.NewFormatter(b))
func (c *ConfigState) Sprint(a ...interface{}) string {
return fmt.Sprint(c.convertArgs(a)...)
}
// Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
// passed with a Formatter interface returned by c.NewFormatter. It returns
// the resulting string. See NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Sprintf(format, c.NewFormatter(a), c.NewFormatter(b))
func (c *ConfigState) Sprintf(format string, a ...interface{}) string {
return fmt.Sprintf(format, c.convertArgs(a)...)
}
// Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
// were passed with a Formatter interface returned by c.NewFormatter. It
// returns the resulting string. See NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Sprintln(c.NewFormatter(a), c.NewFormatter(b))
func (c *ConfigState) Sprintln(a ...interface{}) string {
return fmt.Sprintln(c.convertArgs(a)...)
}
/*
NewFormatter returns a custom formatter that satisfies the fmt.Formatter
interface. As a result, it integrates cleanly with standard fmt package
printing functions. The formatter is useful for inline printing of smaller data
types similar to the standard %v format specifier.
The custom formatter only responds to the %v (most compact), %+v (adds pointer
addresses), %#v (adds types), and %#+v (adds types and pointer addresses) verb
combinations. Any other verbs such as %x and %q will be sent to the the
standard fmt package for formatting. In addition, the custom formatter ignores
the width and precision arguments (however they will still work on the format
specifiers not handled by the custom formatter).
Typically this function shouldn't be called directly. It is much easier to make
use of the custom formatter by calling one of the convenience functions such as
c.Printf, c.Println, or c.Printf.
*/
func (c *ConfigState) NewFormatter(v interface{}) fmt.Formatter {
return newFormatter(c, v)
}
// Fdump formats and displays the passed arguments to io.Writer w. It formats
// exactly the same as Dump.
func (c *ConfigState) Fdump(w io.Writer, a ...interface{}) {
fdump(c, w, a...)
}
/*
Dump displays the passed parameters to standard out with newlines, customizable
indentation, and additional debug information such as complete types and all
pointer addresses used to indirect to the final value. It provides the
following features over the built-in printing facilities provided by the fmt
package:
* Pointers are dereferenced and followed
* Circular data structures are detected and handled properly
* Custom Stringer/error interfaces are optionally invoked, including
on unexported types
* Custom types which only implement the Stringer/error interfaces via
a pointer receiver are optionally invoked when passing non-pointer
variables
* Byte arrays and slices are dumped like the hexdump -C command which
includes offsets, byte values in hex, and ASCII output
The configuration options are controlled by modifying the public members
of c. See ConfigState for options documentation.
See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
get the formatted result as a string.
*/
func (c *ConfigState) Dump(a ...interface{}) {
fdump(c, os.Stdout, a...)
}
// Sdump returns a string with the passed arguments formatted exactly the same
// as Dump.
func (c *ConfigState) Sdump(a ...interface{}) string {
var buf bytes.Buffer
fdump(c, &buf, a...)
return buf.String()
}
// convertArgs accepts a slice of arguments and returns a slice of the same
// length with each argument converted to a spew Formatter interface using
// the ConfigState associated with s.
func (c *ConfigState) convertArgs(args []interface{}) (formatters []interface{}) {
formatters = make([]interface{}, len(args))
for index, arg := range args {
formatters[index] = newFormatter(c, arg)
}
return formatters
}
// NewDefaultConfig returns a ConfigState with the following default settings.
//
// Indent: " "
// MaxDepth: 0
// DisableMethods: false
// DisablePointerMethods: false
// ContinueOnMethod: false
// SortKeys: false
func NewDefaultConfig() *ConfigState {
return &ConfigState{Indent: " "}
}

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/*
* Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
Package spew implements a deep pretty printer for Go data structures to aid in
debugging.
A quick overview of the additional features spew provides over the built-in
printing facilities for Go data types are as follows:
* Pointers are dereferenced and followed
* Circular data structures are detected and handled properly
* Custom Stringer/error interfaces are optionally invoked, including
on unexported types
* Custom types which only implement the Stringer/error interfaces via
a pointer receiver are optionally invoked when passing non-pointer
variables
* Byte arrays and slices are dumped like the hexdump -C command which
includes offsets, byte values in hex, and ASCII output (only when using
Dump style)
There are two different approaches spew allows for dumping Go data structures:
* Dump style which prints with newlines, customizable indentation,
and additional debug information such as types and all pointer addresses
used to indirect to the final value
* A custom Formatter interface that integrates cleanly with the standard fmt
package and replaces %v, %+v, %#v, and %#+v to provide inline printing
similar to the default %v while providing the additional functionality
outlined above and passing unsupported format verbs such as %x and %q
along to fmt
Quick Start
This section demonstrates how to quickly get started with spew. See the
sections below for further details on formatting and configuration options.
To dump a variable with full newlines, indentation, type, and pointer
information use Dump, Fdump, or Sdump:
spew.Dump(myVar1, myVar2, ...)
spew.Fdump(someWriter, myVar1, myVar2, ...)
str := spew.Sdump(myVar1, myVar2, ...)
Alternatively, if you would prefer to use format strings with a compacted inline
printing style, use the convenience wrappers Printf, Fprintf, etc with
%v (most compact), %+v (adds pointer addresses), %#v (adds types), or
%#+v (adds types and pointer addresses):
spew.Printf("myVar1: %v -- myVar2: %+v", myVar1, myVar2)
spew.Printf("myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
spew.Fprintf(someWriter, "myVar1: %v -- myVar2: %+v", myVar1, myVar2)
spew.Fprintf(someWriter, "myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
Configuration Options
Configuration of spew is handled by fields in the ConfigState type. For
convenience, all of the top-level functions use a global state available
via the spew.Config global.
It is also possible to create a ConfigState instance that provides methods
equivalent to the top-level functions. This allows concurrent configuration
options. See the ConfigState documentation for more details.
The following configuration options are available:
* Indent
String to use for each indentation level for Dump functions.
It is a single space by default. A popular alternative is "\t".
* MaxDepth
Maximum number of levels to descend into nested data structures.
There is no limit by default.
* DisableMethods
Disables invocation of error and Stringer interface methods.
Method invocation is enabled by default.
* DisablePointerMethods
Disables invocation of error and Stringer interface methods on types
which only accept pointer receivers from non-pointer variables.
Pointer method invocation is enabled by default.
* DisablePointerAddresses
DisablePointerAddresses specifies whether to disable the printing of
pointer addresses. This is useful when diffing data structures in tests.
* DisableCapacities
DisableCapacities specifies whether to disable the printing of
capacities for arrays, slices, maps and channels. This is useful when
diffing data structures in tests.
* ContinueOnMethod
Enables recursion into types after invoking error and Stringer interface
methods. Recursion after method invocation is disabled by default.
* SortKeys
Specifies map keys should be sorted before being printed. Use
this to have a more deterministic, diffable output. Note that
only native types (bool, int, uint, floats, uintptr and string)
and types which implement error or Stringer interfaces are
supported with other types sorted according to the
reflect.Value.String() output which guarantees display
stability. Natural map order is used by default.
* SpewKeys
Specifies that, as a last resort attempt, map keys should be
spewed to strings and sorted by those strings. This is only
considered if SortKeys is true.
Dump Usage
Simply call spew.Dump with a list of variables you want to dump:
spew.Dump(myVar1, myVar2, ...)
You may also call spew.Fdump if you would prefer to output to an arbitrary
io.Writer. For example, to dump to standard error:
spew.Fdump(os.Stderr, myVar1, myVar2, ...)
A third option is to call spew.Sdump to get the formatted output as a string:
str := spew.Sdump(myVar1, myVar2, ...)
Sample Dump Output
See the Dump example for details on the setup of the types and variables being
shown here.
(main.Foo) {
unexportedField: (*main.Bar)(0xf84002e210)({
flag: (main.Flag) flagTwo,
data: (uintptr) <nil>
}),
ExportedField: (map[interface {}]interface {}) (len=1) {
(string) (len=3) "one": (bool) true
}
}
Byte (and uint8) arrays and slices are displayed uniquely like the hexdump -C
command as shown.
([]uint8) (len=32 cap=32) {
00000000 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 |............... |
00000010 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 |!"#$%&'()*+,-./0|
00000020 31 32 |12|
}
Custom Formatter
Spew provides a custom formatter that implements the fmt.Formatter interface
so that it integrates cleanly with standard fmt package printing functions. The
formatter is useful for inline printing of smaller data types similar to the
standard %v format specifier.
The custom formatter only responds to the %v (most compact), %+v (adds pointer
addresses), %#v (adds types), or %#+v (adds types and pointer addresses) verb
combinations. Any other verbs such as %x and %q will be sent to the the
standard fmt package for formatting. In addition, the custom formatter ignores
the width and precision arguments (however they will still work on the format
specifiers not handled by the custom formatter).
Custom Formatter Usage
The simplest way to make use of the spew custom formatter is to call one of the
convenience functions such as spew.Printf, spew.Println, or spew.Printf. The
functions have syntax you are most likely already familiar with:
spew.Printf("myVar1: %v -- myVar2: %+v", myVar1, myVar2)
spew.Printf("myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
spew.Println(myVar, myVar2)
spew.Fprintf(os.Stderr, "myVar1: %v -- myVar2: %+v", myVar1, myVar2)
spew.Fprintf(os.Stderr, "myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
See the Index for the full list convenience functions.
Sample Formatter Output
Double pointer to a uint8:
%v: <**>5
%+v: <**>(0xf8400420d0->0xf8400420c8)5
%#v: (**uint8)5
%#+v: (**uint8)(0xf8400420d0->0xf8400420c8)5
Pointer to circular struct with a uint8 field and a pointer to itself:
%v: <*>{1 <*><shown>}
%+v: <*>(0xf84003e260){ui8:1 c:<*>(0xf84003e260)<shown>}
%#v: (*main.circular){ui8:(uint8)1 c:(*main.circular)<shown>}
%#+v: (*main.circular)(0xf84003e260){ui8:(uint8)1 c:(*main.circular)(0xf84003e260)<shown>}
See the Printf example for details on the setup of variables being shown
here.
Errors
Since it is possible for custom Stringer/error interfaces to panic, spew
detects them and handles them internally by printing the panic information
inline with the output. Since spew is intended to provide deep pretty printing
capabilities on structures, it intentionally does not return any errors.
*/
package spew

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/*
* Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package spew
import (
"bytes"
"encoding/hex"
"fmt"
"io"
"os"
"reflect"
"regexp"
"strconv"
"strings"
)
var (
// uint8Type is a reflect.Type representing a uint8. It is used to
// convert cgo types to uint8 slices for hexdumping.
uint8Type = reflect.TypeOf(uint8(0))
// cCharRE is a regular expression that matches a cgo char.
// It is used to detect character arrays to hexdump them.
cCharRE = regexp.MustCompile(`^.*\._Ctype_char$`)
// cUnsignedCharRE is a regular expression that matches a cgo unsigned
// char. It is used to detect unsigned character arrays to hexdump
// them.
cUnsignedCharRE = regexp.MustCompile(`^.*\._Ctype_unsignedchar$`)
// cUint8tCharRE is a regular expression that matches a cgo uint8_t.
// It is used to detect uint8_t arrays to hexdump them.
cUint8tCharRE = regexp.MustCompile(`^.*\._Ctype_uint8_t$`)
)
// dumpState contains information about the state of a dump operation.
type dumpState struct {
w io.Writer
depth int
pointers map[uintptr]int
ignoreNextType bool
ignoreNextIndent bool
cs *ConfigState
}
// indent performs indentation according to the depth level and cs.Indent
// option.
func (d *dumpState) indent() {
if d.ignoreNextIndent {
d.ignoreNextIndent = false
return
}
d.w.Write(bytes.Repeat([]byte(d.cs.Indent), d.depth))
}
// unpackValue returns values inside of non-nil interfaces when possible.
// This is useful for data types like structs, arrays, slices, and maps which
// can contain varying types packed inside an interface.
func (d *dumpState) unpackValue(v reflect.Value) reflect.Value {
if v.Kind() == reflect.Interface && !v.IsNil() {
v = v.Elem()
}
return v
}
// dumpPtr handles formatting of pointers by indirecting them as necessary.
func (d *dumpState) dumpPtr(v reflect.Value) {
// Remove pointers at or below the current depth from map used to detect
// circular refs.
for k, depth := range d.pointers {
if depth >= d.depth {
delete(d.pointers, k)
}
}
// Keep list of all dereferenced pointers to show later.
pointerChain := make([]uintptr, 0)
// Figure out how many levels of indirection there are by dereferencing
// pointers and unpacking interfaces down the chain while detecting circular
// references.
nilFound := false
cycleFound := false
indirects := 0
ve := v
for ve.Kind() == reflect.Ptr {
if ve.IsNil() {
nilFound = true
break
}
indirects++
addr := ve.Pointer()
pointerChain = append(pointerChain, addr)
if pd, ok := d.pointers[addr]; ok && pd < d.depth {
cycleFound = true
indirects--
break
}
d.pointers[addr] = d.depth
ve = ve.Elem()
if ve.Kind() == reflect.Interface {
if ve.IsNil() {
nilFound = true
break
}
ve = ve.Elem()
}
}
// Display type information.
d.w.Write(openParenBytes)
d.w.Write(bytes.Repeat(asteriskBytes, indirects))
d.w.Write([]byte(ve.Type().String()))
d.w.Write(closeParenBytes)
// Display pointer information.
if !d.cs.DisablePointerAddresses && len(pointerChain) > 0 {
d.w.Write(openParenBytes)
for i, addr := range pointerChain {
if i > 0 {
d.w.Write(pointerChainBytes)
}
printHexPtr(d.w, addr)
}
d.w.Write(closeParenBytes)
}
// Display dereferenced value.
d.w.Write(openParenBytes)
switch {
case nilFound:
d.w.Write(nilAngleBytes)
case cycleFound:
d.w.Write(circularBytes)
default:
d.ignoreNextType = true
d.dump(ve)
}
d.w.Write(closeParenBytes)
}
// dumpSlice handles formatting of arrays and slices. Byte (uint8 under
// reflection) arrays and slices are dumped in hexdump -C fashion.
func (d *dumpState) dumpSlice(v reflect.Value) {
// Determine whether this type should be hex dumped or not. Also,
// for types which should be hexdumped, try to use the underlying data
// first, then fall back to trying to convert them to a uint8 slice.
var buf []uint8
doConvert := false
doHexDump := false
numEntries := v.Len()
if numEntries > 0 {
vt := v.Index(0).Type()
vts := vt.String()
switch {
// C types that need to be converted.
case cCharRE.MatchString(vts):
fallthrough
case cUnsignedCharRE.MatchString(vts):
fallthrough
case cUint8tCharRE.MatchString(vts):
doConvert = true
// Try to use existing uint8 slices and fall back to converting
// and copying if that fails.
case vt.Kind() == reflect.Uint8:
// We need an addressable interface to convert the type
// to a byte slice. However, the reflect package won't
// give us an interface on certain things like
// unexported struct fields in order to enforce
// visibility rules. We use unsafe, when available, to
// bypass these restrictions since this package does not
// mutate the values.
vs := v
if !vs.CanInterface() || !vs.CanAddr() {
vs = unsafeReflectValue(vs)
}
if !UnsafeDisabled {
vs = vs.Slice(0, numEntries)
// Use the existing uint8 slice if it can be
// type asserted.
iface := vs.Interface()
if slice, ok := iface.([]uint8); ok {
buf = slice
doHexDump = true
break
}
}
// The underlying data needs to be converted if it can't
// be type asserted to a uint8 slice.
doConvert = true
}
// Copy and convert the underlying type if needed.
if doConvert && vt.ConvertibleTo(uint8Type) {
// Convert and copy each element into a uint8 byte
// slice.
buf = make([]uint8, numEntries)
for i := 0; i < numEntries; i++ {
vv := v.Index(i)
buf[i] = uint8(vv.Convert(uint8Type).Uint())
}
doHexDump = true
}
}
// Hexdump the entire slice as needed.
if doHexDump {
indent := strings.Repeat(d.cs.Indent, d.depth)
str := indent + hex.Dump(buf)
str = strings.Replace(str, "\n", "\n"+indent, -1)
str = strings.TrimRight(str, d.cs.Indent)
d.w.Write([]byte(str))
return
}
// Recursively call dump for each item.
for i := 0; i < numEntries; i++ {
d.dump(d.unpackValue(v.Index(i)))
if i < (numEntries - 1) {
d.w.Write(commaNewlineBytes)
} else {
d.w.Write(newlineBytes)
}
}
}
// dump is the main workhorse for dumping a value. It uses the passed reflect
// value to figure out what kind of object we are dealing with and formats it
// appropriately. It is a recursive function, however circular data structures
// are detected and handled properly.
func (d *dumpState) dump(v reflect.Value) {
// Handle invalid reflect values immediately.
kind := v.Kind()
if kind == reflect.Invalid {
d.w.Write(invalidAngleBytes)
return
}
// Handle pointers specially.
if kind == reflect.Ptr {
d.indent()
d.dumpPtr(v)
return
}
// Print type information unless already handled elsewhere.
if !d.ignoreNextType {
d.indent()
d.w.Write(openParenBytes)
d.w.Write([]byte(v.Type().String()))
d.w.Write(closeParenBytes)
d.w.Write(spaceBytes)
}
d.ignoreNextType = false
// Display length and capacity if the built-in len and cap functions
// work with the value's kind and the len/cap itself is non-zero.
valueLen, valueCap := 0, 0
switch v.Kind() {
case reflect.Array, reflect.Slice, reflect.Chan:
valueLen, valueCap = v.Len(), v.Cap()
case reflect.Map, reflect.String:
valueLen = v.Len()
}
if valueLen != 0 || !d.cs.DisableCapacities && valueCap != 0 {
d.w.Write(openParenBytes)
if valueLen != 0 {
d.w.Write(lenEqualsBytes)
printInt(d.w, int64(valueLen), 10)
}
if !d.cs.DisableCapacities && valueCap != 0 {
if valueLen != 0 {
d.w.Write(spaceBytes)
}
d.w.Write(capEqualsBytes)
printInt(d.w, int64(valueCap), 10)
}
d.w.Write(closeParenBytes)
d.w.Write(spaceBytes)
}
// Call Stringer/error interfaces if they exist and the handle methods flag
// is enabled
if !d.cs.DisableMethods {
if (kind != reflect.Invalid) && (kind != reflect.Interface) {
if handled := handleMethods(d.cs, d.w, v); handled {
return
}
}
}
switch kind {
case reflect.Invalid:
// Do nothing. We should never get here since invalid has already
// been handled above.
case reflect.Bool:
printBool(d.w, v.Bool())
case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
printInt(d.w, v.Int(), 10)
case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
printUint(d.w, v.Uint(), 10)
case reflect.Float32:
printFloat(d.w, v.Float(), 32)
case reflect.Float64:
printFloat(d.w, v.Float(), 64)
case reflect.Complex64:
printComplex(d.w, v.Complex(), 32)
case reflect.Complex128:
printComplex(d.w, v.Complex(), 64)
case reflect.Slice:
if v.IsNil() {
d.w.Write(nilAngleBytes)
break
}
fallthrough
case reflect.Array:
d.w.Write(openBraceNewlineBytes)
d.depth++
if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
d.indent()
d.w.Write(maxNewlineBytes)
} else {
d.dumpSlice(v)
}
d.depth--
d.indent()
d.w.Write(closeBraceBytes)
case reflect.String:
d.w.Write([]byte(strconv.Quote(v.String())))
case reflect.Interface:
// The only time we should get here is for nil interfaces due to
// unpackValue calls.
if v.IsNil() {
d.w.Write(nilAngleBytes)
}
case reflect.Ptr:
// Do nothing. We should never get here since pointers have already
// been handled above.
case reflect.Map:
// nil maps should be indicated as different than empty maps
if v.IsNil() {
d.w.Write(nilAngleBytes)
break
}
d.w.Write(openBraceNewlineBytes)
d.depth++
if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
d.indent()
d.w.Write(maxNewlineBytes)
} else {
numEntries := v.Len()
keys := v.MapKeys()
if d.cs.SortKeys {
sortValues(keys, d.cs)
}
for i, key := range keys {
d.dump(d.unpackValue(key))
d.w.Write(colonSpaceBytes)
d.ignoreNextIndent = true
d.dump(d.unpackValue(v.MapIndex(key)))
if i < (numEntries - 1) {
d.w.Write(commaNewlineBytes)
} else {
d.w.Write(newlineBytes)
}
}
}
d.depth--
d.indent()
d.w.Write(closeBraceBytes)
case reflect.Struct:
d.w.Write(openBraceNewlineBytes)
d.depth++
if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
d.indent()
d.w.Write(maxNewlineBytes)
} else {
vt := v.Type()
numFields := v.NumField()
for i := 0; i < numFields; i++ {
d.indent()
vtf := vt.Field(i)
d.w.Write([]byte(vtf.Name))
d.w.Write(colonSpaceBytes)
d.ignoreNextIndent = true
d.dump(d.unpackValue(v.Field(i)))
if i < (numFields - 1) {
d.w.Write(commaNewlineBytes)
} else {
d.w.Write(newlineBytes)
}
}
}
d.depth--
d.indent()
d.w.Write(closeBraceBytes)
case reflect.Uintptr:
printHexPtr(d.w, uintptr(v.Uint()))
case reflect.UnsafePointer, reflect.Chan, reflect.Func:
printHexPtr(d.w, v.Pointer())
// There were not any other types at the time this code was written, but
// fall back to letting the default fmt package handle it in case any new
// types are added.
default:
if v.CanInterface() {
fmt.Fprintf(d.w, "%v", v.Interface())
} else {
fmt.Fprintf(d.w, "%v", v.String())
}
}
}
// fdump is a helper function to consolidate the logic from the various public
// methods which take varying writers and config states.
func fdump(cs *ConfigState, w io.Writer, a ...interface{}) {
for _, arg := range a {
if arg == nil {
w.Write(interfaceBytes)
w.Write(spaceBytes)
w.Write(nilAngleBytes)
w.Write(newlineBytes)
continue
}
d := dumpState{w: w, cs: cs}
d.pointers = make(map[uintptr]int)
d.dump(reflect.ValueOf(arg))
d.w.Write(newlineBytes)
}
}
// Fdump formats and displays the passed arguments to io.Writer w. It formats
// exactly the same as Dump.
func Fdump(w io.Writer, a ...interface{}) {
fdump(&Config, w, a...)
}
// Sdump returns a string with the passed arguments formatted exactly the same
// as Dump.
func Sdump(a ...interface{}) string {
var buf bytes.Buffer
fdump(&Config, &buf, a...)
return buf.String()
}
/*
Dump displays the passed parameters to standard out with newlines, customizable
indentation, and additional debug information such as complete types and all
pointer addresses used to indirect to the final value. It provides the
following features over the built-in printing facilities provided by the fmt
package:
* Pointers are dereferenced and followed
* Circular data structures are detected and handled properly
* Custom Stringer/error interfaces are optionally invoked, including
on unexported types
* Custom types which only implement the Stringer/error interfaces via
a pointer receiver are optionally invoked when passing non-pointer
variables
* Byte arrays and slices are dumped like the hexdump -C command which
includes offsets, byte values in hex, and ASCII output
The configuration options are controlled by an exported package global,
spew.Config. See ConfigState for options documentation.
See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
get the formatted result as a string.
*/
func Dump(a ...interface{}) {
fdump(&Config, os.Stdout, a...)
}

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/*
* Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package spew
import (
"bytes"
"fmt"
"reflect"
"strconv"
"strings"
)
// supportedFlags is a list of all the character flags supported by fmt package.
const supportedFlags = "0-+# "
// formatState implements the fmt.Formatter interface and contains information
// about the state of a formatting operation. The NewFormatter function can
// be used to get a new Formatter which can be used directly as arguments
// in standard fmt package printing calls.
type formatState struct {
value interface{}
fs fmt.State
depth int
pointers map[uintptr]int
ignoreNextType bool
cs *ConfigState
}
// buildDefaultFormat recreates the original format string without precision
// and width information to pass in to fmt.Sprintf in the case of an
// unrecognized type. Unless new types are added to the language, this
// function won't ever be called.
func (f *formatState) buildDefaultFormat() (format string) {
buf := bytes.NewBuffer(percentBytes)
for _, flag := range supportedFlags {
if f.fs.Flag(int(flag)) {
buf.WriteRune(flag)
}
}
buf.WriteRune('v')
format = buf.String()
return format
}
// constructOrigFormat recreates the original format string including precision
// and width information to pass along to the standard fmt package. This allows
// automatic deferral of all format strings this package doesn't support.
func (f *formatState) constructOrigFormat(verb rune) (format string) {
buf := bytes.NewBuffer(percentBytes)
for _, flag := range supportedFlags {
if f.fs.Flag(int(flag)) {
buf.WriteRune(flag)
}
}
if width, ok := f.fs.Width(); ok {
buf.WriteString(strconv.Itoa(width))
}
if precision, ok := f.fs.Precision(); ok {
buf.Write(precisionBytes)
buf.WriteString(strconv.Itoa(precision))
}
buf.WriteRune(verb)
format = buf.String()
return format
}
// unpackValue returns values inside of non-nil interfaces when possible and
// ensures that types for values which have been unpacked from an interface
// are displayed when the show types flag is also set.
// This is useful for data types like structs, arrays, slices, and maps which
// can contain varying types packed inside an interface.
func (f *formatState) unpackValue(v reflect.Value) reflect.Value {
if v.Kind() == reflect.Interface {
f.ignoreNextType = false
if !v.IsNil() {
v = v.Elem()
}
}
return v
}
// formatPtr handles formatting of pointers by indirecting them as necessary.
func (f *formatState) formatPtr(v reflect.Value) {
// Display nil if top level pointer is nil.
showTypes := f.fs.Flag('#')
if v.IsNil() && (!showTypes || f.ignoreNextType) {
f.fs.Write(nilAngleBytes)
return
}
// Remove pointers at or below the current depth from map used to detect
// circular refs.
for k, depth := range f.pointers {
if depth >= f.depth {
delete(f.pointers, k)
}
}
// Keep list of all dereferenced pointers to possibly show later.
pointerChain := make([]uintptr, 0)
// Figure out how many levels of indirection there are by derferencing
// pointers and unpacking interfaces down the chain while detecting circular
// references.
nilFound := false
cycleFound := false
indirects := 0
ve := v
for ve.Kind() == reflect.Ptr {
if ve.IsNil() {
nilFound = true
break
}
indirects++
addr := ve.Pointer()
pointerChain = append(pointerChain, addr)
if pd, ok := f.pointers[addr]; ok && pd < f.depth {
cycleFound = true
indirects--
break
}
f.pointers[addr] = f.depth
ve = ve.Elem()
if ve.Kind() == reflect.Interface {
if ve.IsNil() {
nilFound = true
break
}
ve = ve.Elem()
}
}
// Display type or indirection level depending on flags.
if showTypes && !f.ignoreNextType {
f.fs.Write(openParenBytes)
f.fs.Write(bytes.Repeat(asteriskBytes, indirects))
f.fs.Write([]byte(ve.Type().String()))
f.fs.Write(closeParenBytes)
} else {
if nilFound || cycleFound {
indirects += strings.Count(ve.Type().String(), "*")
}
f.fs.Write(openAngleBytes)
f.fs.Write([]byte(strings.Repeat("*", indirects)))
f.fs.Write(closeAngleBytes)
}
// Display pointer information depending on flags.
if f.fs.Flag('+') && (len(pointerChain) > 0) {
f.fs.Write(openParenBytes)
for i, addr := range pointerChain {
if i > 0 {
f.fs.Write(pointerChainBytes)
}
printHexPtr(f.fs, addr)
}
f.fs.Write(closeParenBytes)
}
// Display dereferenced value.
switch {
case nilFound:
f.fs.Write(nilAngleBytes)
case cycleFound:
f.fs.Write(circularShortBytes)
default:
f.ignoreNextType = true
f.format(ve)
}
}
// format is the main workhorse for providing the Formatter interface. It
// uses the passed reflect value to figure out what kind of object we are
// dealing with and formats it appropriately. It is a recursive function,
// however circular data structures are detected and handled properly.
func (f *formatState) format(v reflect.Value) {
// Handle invalid reflect values immediately.
kind := v.Kind()
if kind == reflect.Invalid {
f.fs.Write(invalidAngleBytes)
return
}
// Handle pointers specially.
if kind == reflect.Ptr {
f.formatPtr(v)
return
}
// Print type information unless already handled elsewhere.
if !f.ignoreNextType && f.fs.Flag('#') {
f.fs.Write(openParenBytes)
f.fs.Write([]byte(v.Type().String()))
f.fs.Write(closeParenBytes)
}
f.ignoreNextType = false
// Call Stringer/error interfaces if they exist and the handle methods
// flag is enabled.
if !f.cs.DisableMethods {
if (kind != reflect.Invalid) && (kind != reflect.Interface) {
if handled := handleMethods(f.cs, f.fs, v); handled {
return
}
}
}
switch kind {
case reflect.Invalid:
// Do nothing. We should never get here since invalid has already
// been handled above.
case reflect.Bool:
printBool(f.fs, v.Bool())
case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
printInt(f.fs, v.Int(), 10)
case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
printUint(f.fs, v.Uint(), 10)
case reflect.Float32:
printFloat(f.fs, v.Float(), 32)
case reflect.Float64:
printFloat(f.fs, v.Float(), 64)
case reflect.Complex64:
printComplex(f.fs, v.Complex(), 32)
case reflect.Complex128:
printComplex(f.fs, v.Complex(), 64)
case reflect.Slice:
if v.IsNil() {
f.fs.Write(nilAngleBytes)
break
}
fallthrough
case reflect.Array:
f.fs.Write(openBracketBytes)
f.depth++
if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
f.fs.Write(maxShortBytes)
} else {
numEntries := v.Len()
for i := 0; i < numEntries; i++ {
if i > 0 {
f.fs.Write(spaceBytes)
}
f.ignoreNextType = true
f.format(f.unpackValue(v.Index(i)))
}
}
f.depth--
f.fs.Write(closeBracketBytes)
case reflect.String:
f.fs.Write([]byte(v.String()))
case reflect.Interface:
// The only time we should get here is for nil interfaces due to
// unpackValue calls.
if v.IsNil() {
f.fs.Write(nilAngleBytes)
}
case reflect.Ptr:
// Do nothing. We should never get here since pointers have already
// been handled above.
case reflect.Map:
// nil maps should be indicated as different than empty maps
if v.IsNil() {
f.fs.Write(nilAngleBytes)
break
}
f.fs.Write(openMapBytes)
f.depth++
if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
f.fs.Write(maxShortBytes)
} else {
keys := v.MapKeys()
if f.cs.SortKeys {
sortValues(keys, f.cs)
}
for i, key := range keys {
if i > 0 {
f.fs.Write(spaceBytes)
}
f.ignoreNextType = true
f.format(f.unpackValue(key))
f.fs.Write(colonBytes)
f.ignoreNextType = true
f.format(f.unpackValue(v.MapIndex(key)))
}
}
f.depth--
f.fs.Write(closeMapBytes)
case reflect.Struct:
numFields := v.NumField()
f.fs.Write(openBraceBytes)
f.depth++
if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
f.fs.Write(maxShortBytes)
} else {
vt := v.Type()
for i := 0; i < numFields; i++ {
if i > 0 {
f.fs.Write(spaceBytes)
}
vtf := vt.Field(i)
if f.fs.Flag('+') || f.fs.Flag('#') {
f.fs.Write([]byte(vtf.Name))
f.fs.Write(colonBytes)
}
f.format(f.unpackValue(v.Field(i)))
}
}
f.depth--
f.fs.Write(closeBraceBytes)
case reflect.Uintptr:
printHexPtr(f.fs, uintptr(v.Uint()))
case reflect.UnsafePointer, reflect.Chan, reflect.Func:
printHexPtr(f.fs, v.Pointer())
// There were not any other types at the time this code was written, but
// fall back to letting the default fmt package handle it if any get added.
default:
format := f.buildDefaultFormat()
if v.CanInterface() {
fmt.Fprintf(f.fs, format, v.Interface())
} else {
fmt.Fprintf(f.fs, format, v.String())
}
}
}
// Format satisfies the fmt.Formatter interface. See NewFormatter for usage
// details.
func (f *formatState) Format(fs fmt.State, verb rune) {
f.fs = fs
// Use standard formatting for verbs that are not v.
if verb != 'v' {
format := f.constructOrigFormat(verb)
fmt.Fprintf(fs, format, f.value)
return
}
if f.value == nil {
if fs.Flag('#') {
fs.Write(interfaceBytes)
}
fs.Write(nilAngleBytes)
return
}
f.format(reflect.ValueOf(f.value))
}
// newFormatter is a helper function to consolidate the logic from the various
// public methods which take varying config states.
func newFormatter(cs *ConfigState, v interface{}) fmt.Formatter {
fs := &formatState{value: v, cs: cs}
fs.pointers = make(map[uintptr]int)
return fs
}
/*
NewFormatter returns a custom formatter that satisfies the fmt.Formatter
interface. As a result, it integrates cleanly with standard fmt package
printing functions. The formatter is useful for inline printing of smaller data
types similar to the standard %v format specifier.
The custom formatter only responds to the %v (most compact), %+v (adds pointer
addresses), %#v (adds types), or %#+v (adds types and pointer addresses) verb
combinations. Any other verbs such as %x and %q will be sent to the the
standard fmt package for formatting. In addition, the custom formatter ignores
the width and precision arguments (however they will still work on the format
specifiers not handled by the custom formatter).
Typically this function shouldn't be called directly. It is much easier to make
use of the custom formatter by calling one of the convenience functions such as
Printf, Println, or Fprintf.
*/
func NewFormatter(v interface{}) fmt.Formatter {
return newFormatter(&Config, v)
}

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/*
* Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package spew
import (
"fmt"
"io"
)
// Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
// passed with a default Formatter interface returned by NewFormatter. It
// returns the formatted string as a value that satisfies error. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Errorf(format, spew.NewFormatter(a), spew.NewFormatter(b))
func Errorf(format string, a ...interface{}) (err error) {
return fmt.Errorf(format, convertArgs(a)...)
}
// Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
// passed with a default Formatter interface returned by NewFormatter. It
// returns the number of bytes written and any write error encountered. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Fprint(w, spew.NewFormatter(a), spew.NewFormatter(b))
func Fprint(w io.Writer, a ...interface{}) (n int, err error) {
return fmt.Fprint(w, convertArgs(a)...)
}
// Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
// passed with a default Formatter interface returned by NewFormatter. It
// returns the number of bytes written and any write error encountered. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Fprintf(w, format, spew.NewFormatter(a), spew.NewFormatter(b))
func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
return fmt.Fprintf(w, format, convertArgs(a)...)
}
// Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
// passed with a default Formatter interface returned by NewFormatter. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Fprintln(w, spew.NewFormatter(a), spew.NewFormatter(b))
func Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
return fmt.Fprintln(w, convertArgs(a)...)
}
// Print is a wrapper for fmt.Print that treats each argument as if it were
// passed with a default Formatter interface returned by NewFormatter. It
// returns the number of bytes written and any write error encountered. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Print(spew.NewFormatter(a), spew.NewFormatter(b))
func Print(a ...interface{}) (n int, err error) {
return fmt.Print(convertArgs(a)...)
}
// Printf is a wrapper for fmt.Printf that treats each argument as if it were
// passed with a default Formatter interface returned by NewFormatter. It
// returns the number of bytes written and any write error encountered. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Printf(format, spew.NewFormatter(a), spew.NewFormatter(b))
func Printf(format string, a ...interface{}) (n int, err error) {
return fmt.Printf(format, convertArgs(a)...)
}
// Println is a wrapper for fmt.Println that treats each argument as if it were
// passed with a default Formatter interface returned by NewFormatter. It
// returns the number of bytes written and any write error encountered. See
// NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Println(spew.NewFormatter(a), spew.NewFormatter(b))
func Println(a ...interface{}) (n int, err error) {
return fmt.Println(convertArgs(a)...)
}
// Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
// passed with a default Formatter interface returned by NewFormatter. It
// returns the resulting string. See NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Sprint(spew.NewFormatter(a), spew.NewFormatter(b))
func Sprint(a ...interface{}) string {
return fmt.Sprint(convertArgs(a)...)
}
// Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
// passed with a default Formatter interface returned by NewFormatter. It
// returns the resulting string. See NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Sprintf(format, spew.NewFormatter(a), spew.NewFormatter(b))
func Sprintf(format string, a ...interface{}) string {
return fmt.Sprintf(format, convertArgs(a)...)
}
// Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
// were passed with a default Formatter interface returned by NewFormatter. It
// returns the resulting string. See NewFormatter for formatting details.
//
// This function is shorthand for the following syntax:
//
// fmt.Sprintln(spew.NewFormatter(a), spew.NewFormatter(b))
func Sprintln(a ...interface{}) string {
return fmt.Sprintln(convertArgs(a)...)
}
// convertArgs accepts a slice of arguments and returns a slice of the same
// length with each argument converted to a default spew Formatter interface.
func convertArgs(args []interface{}) (formatters []interface{}) {
formatters = make([]interface{}, len(args))
for index, arg := range args {
formatters[index] = NewFormatter(arg)
}
return formatters
}

4
vendor/github.com/dgrijalva/jwt-go/.gitignore generated vendored Normal file
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.DS_Store
bin

13
vendor/github.com/dgrijalva/jwt-go/.travis.yml generated vendored Normal file
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@ -0,0 +1,13 @@
language: go
script:
- go vet ./...
- go test -v ./...
go:
- 1.3
- 1.4
- 1.5
- 1.6
- 1.7
- tip

8
vendor/github.com/dgrijalva/jwt-go/LICENSE generated vendored Normal file
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Copyright (c) 2012 Dave Grijalva
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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## Migration Guide from v2 -> v3
Version 3 adds several new, frequently requested features. To do so, it introduces a few breaking changes. We've worked to keep these as minimal as possible. This guide explains the breaking changes and how you can quickly update your code.
### `Token.Claims` is now an interface type
The most requested feature from the 2.0 verison of this library was the ability to provide a custom type to the JSON parser for claims. This was implemented by introducing a new interface, `Claims`, to replace `map[string]interface{}`. We also included two concrete implementations of `Claims`: `MapClaims` and `StandardClaims`.
`MapClaims` is an alias for `map[string]interface{}` with built in validation behavior. It is the default claims type when using `Parse`. The usage is unchanged except you must type cast the claims property.
The old example for parsing a token looked like this..
```go
if token, err := jwt.Parse(tokenString, keyLookupFunc); err == nil {
fmt.Printf("Token for user %v expires %v", token.Claims["user"], token.Claims["exp"])
}
```
is now directly mapped to...
```go
if token, err := jwt.Parse(tokenString, keyLookupFunc); err == nil {
claims := token.Claims.(jwt.MapClaims)
fmt.Printf("Token for user %v expires %v", claims["user"], claims["exp"])
}
```
`StandardClaims` is designed to be embedded in your custom type. You can supply a custom claims type with the new `ParseWithClaims` function. Here's an example of using a custom claims type.
```go
type MyCustomClaims struct {
User string
*StandardClaims
}
if token, err := jwt.ParseWithClaims(tokenString, &MyCustomClaims{}, keyLookupFunc); err == nil {
claims := token.Claims.(*MyCustomClaims)
fmt.Printf("Token for user %v expires %v", claims.User, claims.StandardClaims.ExpiresAt)
}
```
### `ParseFromRequest` has been moved
To keep this library focused on the tokens without becoming overburdened with complex request processing logic, `ParseFromRequest` and its new companion `ParseFromRequestWithClaims` have been moved to a subpackage, `request`. The method signatues have also been augmented to receive a new argument: `Extractor`.
`Extractors` do the work of picking the token string out of a request. The interface is simple and composable.
This simple parsing example:
```go
if token, err := jwt.ParseFromRequest(tokenString, req, keyLookupFunc); err == nil {
fmt.Printf("Token for user %v expires %v", token.Claims["user"], token.Claims["exp"])
}
```
is directly mapped to:
```go
if token, err := request.ParseFromRequest(req, request.OAuth2Extractor, keyLookupFunc); err == nil {
claims := token.Claims.(jwt.MapClaims)
fmt.Printf("Token for user %v expires %v", claims["user"], claims["exp"])
}
```
There are several concrete `Extractor` types provided for your convenience:
* `HeaderExtractor` will search a list of headers until one contains content.
* `ArgumentExtractor` will search a list of keys in request query and form arguments until one contains content.
* `MultiExtractor` will try a list of `Extractors` in order until one returns content.
* `AuthorizationHeaderExtractor` will look in the `Authorization` header for a `Bearer` token.
* `OAuth2Extractor` searches the places an OAuth2 token would be specified (per the spec): `Authorization` header and `access_token` argument
* `PostExtractionFilter` wraps an `Extractor`, allowing you to process the content before it's parsed. A simple example is stripping the `Bearer ` text from a header
### RSA signing methods no longer accept `[]byte` keys
Due to a [critical vulnerability](https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/), we've decided the convenience of accepting `[]byte` instead of `rsa.PublicKey` or `rsa.PrivateKey` isn't worth the risk of misuse.
To replace this behavior, we've added two helper methods: `ParseRSAPrivateKeyFromPEM(key []byte) (*rsa.PrivateKey, error)` and `ParseRSAPublicKeyFromPEM(key []byte) (*rsa.PublicKey, error)`. These are just simple helpers for unpacking PEM encoded PKCS1 and PKCS8 keys. If your keys are encoded any other way, all you need to do is convert them to the `crypto/rsa` package's types.
```go
func keyLookupFunc(*Token) (interface{}, error) {
// Don't forget to validate the alg is what you expect:
if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
// Look up key
key, err := lookupPublicKey(token.Header["kid"])
if err != nil {
return nil, err
}
// Unpack key from PEM encoded PKCS8
return jwt.ParseRSAPublicKeyFromPEM(key)
}
```

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# jwt-go
[![Build Status](https://travis-ci.org/dgrijalva/jwt-go.svg?branch=master)](https://travis-ci.org/dgrijalva/jwt-go)
[![GoDoc](https://godoc.org/github.com/dgrijalva/jwt-go?status.svg)](https://godoc.org/github.com/dgrijalva/jwt-go)
A [go](http://www.golang.org) (or 'golang' for search engine friendliness) implementation of [JSON Web Tokens](http://self-issued.info/docs/draft-ietf-oauth-json-web-token.html)
**NEW VERSION COMING:** There have been a lot of improvements suggested since the version 3.0.0 released in 2016. I'm working now on cutting two different releases: 3.2.0 will contain any non-breaking changes or enhancements. 4.0.0 will follow shortly which will include breaking changes. See the 4.0.0 milestone to get an idea of what's coming. If you have other ideas, or would like to participate in 4.0.0, now's the time. If you depend on this library and don't want to be interrupted, I recommend you use your dependency mangement tool to pin to version 3.
**SECURITY NOTICE:** Some older versions of Go have a security issue in the cryotp/elliptic. Recommendation is to upgrade to at least 1.8.3. See issue #216 for more detail.
**SECURITY NOTICE:** It's important that you [validate the `alg` presented is what you expect](https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/). This library attempts to make it easy to do the right thing by requiring key types match the expected alg, but you should take the extra step to verify it in your usage. See the examples provided.
## What the heck is a JWT?
JWT.io has [a great introduction](https://jwt.io/introduction) to JSON Web Tokens.
In short, it's a signed JSON object that does something useful (for example, authentication). It's commonly used for `Bearer` tokens in Oauth 2. A token is made of three parts, separated by `.`'s. The first two parts are JSON objects, that have been [base64url](http://tools.ietf.org/html/rfc4648) encoded. The last part is the signature, encoded the same way.
The first part is called the header. It contains the necessary information for verifying the last part, the signature. For example, which encryption method was used for signing and what key was used.
The part in the middle is the interesting bit. It's called the Claims and contains the actual stuff you care about. Refer to [the RFC](http://self-issued.info/docs/draft-jones-json-web-token.html) for information about reserved keys and the proper way to add your own.
## What's in the box?
This library supports the parsing and verification as well as the generation and signing of JWTs. Current supported signing algorithms are HMAC SHA, RSA, RSA-PSS, and ECDSA, though hooks are present for adding your own.
## Examples
See [the project documentation](https://godoc.org/github.com/dgrijalva/jwt-go) for examples of usage:
* [Simple example of parsing and validating a token](https://godoc.org/github.com/dgrijalva/jwt-go#example-Parse--Hmac)
* [Simple example of building and signing a token](https://godoc.org/github.com/dgrijalva/jwt-go#example-New--Hmac)
* [Directory of Examples](https://godoc.org/github.com/dgrijalva/jwt-go#pkg-examples)
## Extensions
This library publishes all the necessary components for adding your own signing methods. Simply implement the `SigningMethod` interface and register a factory method using `RegisterSigningMethod`.
Here's an example of an extension that integrates with the Google App Engine signing tools: https://github.com/someone1/gcp-jwt-go
## Compliance
This library was last reviewed to comply with [RTF 7519](http://www.rfc-editor.org/info/rfc7519) dated May 2015 with a few notable differences:
* In order to protect against accidental use of [Unsecured JWTs](http://self-issued.info/docs/draft-ietf-oauth-json-web-token.html#UnsecuredJWT), tokens using `alg=none` will only be accepted if the constant `jwt.UnsafeAllowNoneSignatureType` is provided as the key.
## Project Status & Versioning
This library is considered production ready. Feedback and feature requests are appreciated. The API should be considered stable. There should be very few backwards-incompatible changes outside of major version updates (and only with good reason).
This project uses [Semantic Versioning 2.0.0](http://semver.org). Accepted pull requests will land on `master`. Periodically, versions will be tagged from `master`. You can find all the releases on [the project releases page](https://github.com/dgrijalva/jwt-go/releases).
While we try to make it obvious when we make breaking changes, there isn't a great mechanism for pushing announcements out to users. You may want to use this alternative package include: `gopkg.in/dgrijalva/jwt-go.v3`. It will do the right thing WRT semantic versioning.
**BREAKING CHANGES:***
* Version 3.0.0 includes _a lot_ of changes from the 2.x line, including a few that break the API. We've tried to break as few things as possible, so there should just be a few type signature changes. A full list of breaking changes is available in `VERSION_HISTORY.md`. See `MIGRATION_GUIDE.md` for more information on updating your code.
## Usage Tips
### Signing vs Encryption
A token is simply a JSON object that is signed by its author. this tells you exactly two things about the data:
* The author of the token was in the possession of the signing secret
* The data has not been modified since it was signed
It's important to know that JWT does not provide encryption, which means anyone who has access to the token can read its contents. If you need to protect (encrypt) the data, there is a companion spec, `JWE`, that provides this functionality. JWE is currently outside the scope of this library.
### Choosing a Signing Method
There are several signing methods available, and you should probably take the time to learn about the various options before choosing one. The principal design decision is most likely going to be symmetric vs asymmetric.
Symmetric signing methods, such as HSA, use only a single secret. This is probably the simplest signing method to use since any `[]byte` can be used as a valid secret. They are also slightly computationally faster to use, though this rarely is enough to matter. Symmetric signing methods work the best when both producers and consumers of tokens are trusted, or even the same system. Since the same secret is used to both sign and validate tokens, you can't easily distribute the key for validation.
Asymmetric signing methods, such as RSA, use different keys for signing and verifying tokens. This makes it possible to produce tokens with a private key, and allow any consumer to access the public key for verification.
### Signing Methods and Key Types
Each signing method expects a different object type for its signing keys. See the package documentation for details. Here are the most common ones:
* The [HMAC signing method](https://godoc.org/github.com/dgrijalva/jwt-go#SigningMethodHMAC) (`HS256`,`HS384`,`HS512`) expect `[]byte` values for signing and validation
* The [RSA signing method](https://godoc.org/github.com/dgrijalva/jwt-go#SigningMethodRSA) (`RS256`,`RS384`,`RS512`) expect `*rsa.PrivateKey` for signing and `*rsa.PublicKey` for validation
* The [ECDSA signing method](https://godoc.org/github.com/dgrijalva/jwt-go#SigningMethodECDSA) (`ES256`,`ES384`,`ES512`) expect `*ecdsa.PrivateKey` for signing and `*ecdsa.PublicKey` for validation
### JWT and OAuth
It's worth mentioning that OAuth and JWT are not the same thing. A JWT token is simply a signed JSON object. It can be used anywhere such a thing is useful. There is some confusion, though, as JWT is the most common type of bearer token used in OAuth2 authentication.
Without going too far down the rabbit hole, here's a description of the interaction of these technologies:
* OAuth is a protocol for allowing an identity provider to be separate from the service a user is logging in to. For example, whenever you use Facebook to log into a different service (Yelp, Spotify, etc), you are using OAuth.
* OAuth defines several options for passing around authentication data. One popular method is called a "bearer token". A bearer token is simply a string that _should_ only be held by an authenticated user. Thus, simply presenting this token proves your identity. You can probably derive from here why a JWT might make a good bearer token.
* Because bearer tokens are used for authentication, it's important they're kept secret. This is why transactions that use bearer tokens typically happen over SSL.
## More
Documentation can be found [on godoc.org](http://godoc.org/github.com/dgrijalva/jwt-go).
The command line utility included in this project (cmd/jwt) provides a straightforward example of token creation and parsing as well as a useful tool for debugging your own integration. You'll also find several implementation examples in the documentation.

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## `jwt-go` Version History
#### 3.2.0
* Added method `ParseUnverified` to allow users to split up the tasks of parsing and validation
* HMAC signing method returns `ErrInvalidKeyType` instead of `ErrInvalidKey` where appropriate
* Added options to `request.ParseFromRequest`, which allows for an arbitrary list of modifiers to parsing behavior. Initial set include `WithClaims` and `WithParser`. Existing usage of this function will continue to work as before.
* Deprecated `ParseFromRequestWithClaims` to simplify API in the future.
#### 3.1.0
* Improvements to `jwt` command line tool
* Added `SkipClaimsValidation` option to `Parser`
* Documentation updates
#### 3.0.0
* **Compatibility Breaking Changes**: See MIGRATION_GUIDE.md for tips on updating your code
* Dropped support for `[]byte` keys when using RSA signing methods. This convenience feature could contribute to security vulnerabilities involving mismatched key types with signing methods.
* `ParseFromRequest` has been moved to `request` subpackage and usage has changed
* The `Claims` property on `Token` is now type `Claims` instead of `map[string]interface{}`. The default value is type `MapClaims`, which is an alias to `map[string]interface{}`. This makes it possible to use a custom type when decoding claims.
* Other Additions and Changes
* Added `Claims` interface type to allow users to decode the claims into a custom type
* Added `ParseWithClaims`, which takes a third argument of type `Claims`. Use this function instead of `Parse` if you have a custom type you'd like to decode into.
* Dramatically improved the functionality and flexibility of `ParseFromRequest`, which is now in the `request` subpackage
* Added `ParseFromRequestWithClaims` which is the `FromRequest` equivalent of `ParseWithClaims`
* Added new interface type `Extractor`, which is used for extracting JWT strings from http requests. Used with `ParseFromRequest` and `ParseFromRequestWithClaims`.
* Added several new, more specific, validation errors to error type bitmask
* Moved examples from README to executable example files
* Signing method registry is now thread safe
* Added new property to `ValidationError`, which contains the raw error returned by calls made by parse/verify (such as those returned by keyfunc or json parser)
#### 2.7.0
This will likely be the last backwards compatible release before 3.0.0, excluding essential bug fixes.
* Added new option `-show` to the `jwt` command that will just output the decoded token without verifying
* Error text for expired tokens includes how long it's been expired
* Fixed incorrect error returned from `ParseRSAPublicKeyFromPEM`
* Documentation updates
#### 2.6.0
* Exposed inner error within ValidationError
* Fixed validation errors when using UseJSONNumber flag
* Added several unit tests
#### 2.5.0
* Added support for signing method none. You shouldn't use this. The API tries to make this clear.
* Updated/fixed some documentation
* Added more helpful error message when trying to parse tokens that begin with `BEARER `
#### 2.4.0
* Added new type, Parser, to allow for configuration of various parsing parameters
* You can now specify a list of valid signing methods. Anything outside this set will be rejected.
* You can now opt to use the `json.Number` type instead of `float64` when parsing token JSON
* Added support for [Travis CI](https://travis-ci.org/dgrijalva/jwt-go)
* Fixed some bugs with ECDSA parsing
#### 2.3.0
* Added support for ECDSA signing methods
* Added support for RSA PSS signing methods (requires go v1.4)
#### 2.2.0
* Gracefully handle a `nil` `Keyfunc` being passed to `Parse`. Result will now be the parsed token and an error, instead of a panic.
#### 2.1.0
Backwards compatible API change that was missed in 2.0.0.
* The `SignedString` method on `Token` now takes `interface{}` instead of `[]byte`
#### 2.0.0
There were two major reasons for breaking backwards compatibility with this update. The first was a refactor required to expand the width of the RSA and HMAC-SHA signing implementations. There will likely be no required code changes to support this change.
The second update, while unfortunately requiring a small change in integration, is required to open up this library to other signing methods. Not all keys used for all signing methods have a single standard on-disk representation. Requiring `[]byte` as the type for all keys proved too limiting. Additionally, this implementation allows for pre-parsed tokens to be reused, which might matter in an application that parses a high volume of tokens with a small set of keys. Backwards compatibilty has been maintained for passing `[]byte` to the RSA signing methods, but they will also accept `*rsa.PublicKey` and `*rsa.PrivateKey`.
It is likely the only integration change required here will be to change `func(t *jwt.Token) ([]byte, error)` to `func(t *jwt.Token) (interface{}, error)` when calling `Parse`.
* **Compatibility Breaking Changes**
* `SigningMethodHS256` is now `*SigningMethodHMAC` instead of `type struct`
* `SigningMethodRS256` is now `*SigningMethodRSA` instead of `type struct`
* `KeyFunc` now returns `interface{}` instead of `[]byte`
* `SigningMethod.Sign` now takes `interface{}` instead of `[]byte` for the key
* `SigningMethod.Verify` now takes `interface{}` instead of `[]byte` for the key
* Renamed type `SigningMethodHS256` to `SigningMethodHMAC`. Specific sizes are now just instances of this type.
* Added public package global `SigningMethodHS256`
* Added public package global `SigningMethodHS384`
* Added public package global `SigningMethodHS512`
* Renamed type `SigningMethodRS256` to `SigningMethodRSA`. Specific sizes are now just instances of this type.
* Added public package global `SigningMethodRS256`
* Added public package global `SigningMethodRS384`
* Added public package global `SigningMethodRS512`
* Moved sample private key for HMAC tests from an inline value to a file on disk. Value is unchanged.
* Refactored the RSA implementation to be easier to read
* Exposed helper methods `ParseRSAPrivateKeyFromPEM` and `ParseRSAPublicKeyFromPEM`
#### 1.0.2
* Fixed bug in parsing public keys from certificates
* Added more tests around the parsing of keys for RS256
* Code refactoring in RS256 implementation. No functional changes
#### 1.0.1
* Fixed panic if RS256 signing method was passed an invalid key
#### 1.0.0
* First versioned release
* API stabilized
* Supports creating, signing, parsing, and validating JWT tokens
* Supports RS256 and HS256 signing methods

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package jwt
import (
"crypto/subtle"
"fmt"
"time"
)
// For a type to be a Claims object, it must just have a Valid method that determines
// if the token is invalid for any supported reason
type Claims interface {
Valid() error
}
// Structured version of Claims Section, as referenced at
// https://tools.ietf.org/html/rfc7519#section-4.1
// See examples for how to use this with your own claim types
type StandardClaims struct {
Audience string `json:"aud,omitempty"`
ExpiresAt int64 `json:"exp,omitempty"`
Id string `json:"jti,omitempty"`
IssuedAt int64 `json:"iat,omitempty"`
Issuer string `json:"iss,omitempty"`
NotBefore int64 `json:"nbf,omitempty"`
Subject string `json:"sub,omitempty"`
}
// Validates time based claims "exp, iat, nbf".
// There is no accounting for clock skew.
// As well, if any of the above claims are not in the token, it will still
// be considered a valid claim.
func (c StandardClaims) Valid() error {
vErr := new(ValidationError)
now := TimeFunc().Unix()
// The claims below are optional, by default, so if they are set to the
// default value in Go, let's not fail the verification for them.
if c.VerifyExpiresAt(now, false) == false {
delta := time.Unix(now, 0).Sub(time.Unix(c.ExpiresAt, 0))
vErr.Inner = fmt.Errorf("token is expired by %v", delta)
vErr.Errors |= ValidationErrorExpired
}
if c.VerifyIssuedAt(now, false) == false {
vErr.Inner = fmt.Errorf("Token used before issued")
vErr.Errors |= ValidationErrorIssuedAt
}
if c.VerifyNotBefore(now, false) == false {
vErr.Inner = fmt.Errorf("token is not valid yet")
vErr.Errors |= ValidationErrorNotValidYet
}
if vErr.valid() {
return nil
}
return vErr
}
// Compares the aud claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (c *StandardClaims) VerifyAudience(cmp string, req bool) bool {
return verifyAud(c.Audience, cmp, req)
}
// Compares the exp claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (c *StandardClaims) VerifyExpiresAt(cmp int64, req bool) bool {
return verifyExp(c.ExpiresAt, cmp, req)
}
// Compares the iat claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (c *StandardClaims) VerifyIssuedAt(cmp int64, req bool) bool {
return verifyIat(c.IssuedAt, cmp, req)
}
// Compares the iss claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (c *StandardClaims) VerifyIssuer(cmp string, req bool) bool {
return verifyIss(c.Issuer, cmp, req)
}
// Compares the nbf claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (c *StandardClaims) VerifyNotBefore(cmp int64, req bool) bool {
return verifyNbf(c.NotBefore, cmp, req)
}
// ----- helpers
func verifyAud(aud string, cmp string, required bool) bool {
if aud == "" {
return !required
}
if subtle.ConstantTimeCompare([]byte(aud), []byte(cmp)) != 0 {
return true
} else {
return false
}
}
func verifyExp(exp int64, now int64, required bool) bool {
if exp == 0 {
return !required
}
return now <= exp
}
func verifyIat(iat int64, now int64, required bool) bool {
if iat == 0 {
return !required
}
return now >= iat
}
func verifyIss(iss string, cmp string, required bool) bool {
if iss == "" {
return !required
}
if subtle.ConstantTimeCompare([]byte(iss), []byte(cmp)) != 0 {
return true
} else {
return false
}
}
func verifyNbf(nbf int64, now int64, required bool) bool {
if nbf == 0 {
return !required
}
return now >= nbf
}

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// Package jwt is a Go implementation of JSON Web Tokens: http://self-issued.info/docs/draft-jones-json-web-token.html
//
// See README.md for more info.
package jwt

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package jwt
import (
"crypto"
"crypto/ecdsa"
"crypto/rand"
"errors"
"math/big"
)
var (
// Sadly this is missing from crypto/ecdsa compared to crypto/rsa
ErrECDSAVerification = errors.New("crypto/ecdsa: verification error")
)
// Implements the ECDSA family of signing methods signing methods
// Expects *ecdsa.PrivateKey for signing and *ecdsa.PublicKey for verification
type SigningMethodECDSA struct {
Name string
Hash crypto.Hash
KeySize int
CurveBits int
}
// Specific instances for EC256 and company
var (
SigningMethodES256 *SigningMethodECDSA
SigningMethodES384 *SigningMethodECDSA
SigningMethodES512 *SigningMethodECDSA
)
func init() {
// ES256
SigningMethodES256 = &SigningMethodECDSA{"ES256", crypto.SHA256, 32, 256}
RegisterSigningMethod(SigningMethodES256.Alg(), func() SigningMethod {
return SigningMethodES256
})
// ES384
SigningMethodES384 = &SigningMethodECDSA{"ES384", crypto.SHA384, 48, 384}
RegisterSigningMethod(SigningMethodES384.Alg(), func() SigningMethod {
return SigningMethodES384
})
// ES512
SigningMethodES512 = &SigningMethodECDSA{"ES512", crypto.SHA512, 66, 521}
RegisterSigningMethod(SigningMethodES512.Alg(), func() SigningMethod {
return SigningMethodES512
})
}
func (m *SigningMethodECDSA) Alg() string {
return m.Name
}
// Implements the Verify method from SigningMethod
// For this verify method, key must be an ecdsa.PublicKey struct
func (m *SigningMethodECDSA) Verify(signingString, signature string, key interface{}) error {
var err error
// Decode the signature
var sig []byte
if sig, err = DecodeSegment(signature); err != nil {
return err
}
// Get the key
var ecdsaKey *ecdsa.PublicKey
switch k := key.(type) {
case *ecdsa.PublicKey:
ecdsaKey = k
default:
return ErrInvalidKeyType
}
if len(sig) != 2*m.KeySize {
return ErrECDSAVerification
}
r := big.NewInt(0).SetBytes(sig[:m.KeySize])
s := big.NewInt(0).SetBytes(sig[m.KeySize:])
// Create hasher
if !m.Hash.Available() {
return ErrHashUnavailable
}
hasher := m.Hash.New()
hasher.Write([]byte(signingString))
// Verify the signature
if verifystatus := ecdsa.Verify(ecdsaKey, hasher.Sum(nil), r, s); verifystatus == true {
return nil
} else {
return ErrECDSAVerification
}
}
// Implements the Sign method from SigningMethod
// For this signing method, key must be an ecdsa.PrivateKey struct
func (m *SigningMethodECDSA) Sign(signingString string, key interface{}) (string, error) {
// Get the key
var ecdsaKey *ecdsa.PrivateKey
switch k := key.(type) {
case *ecdsa.PrivateKey:
ecdsaKey = k
default:
return "", ErrInvalidKeyType
}
// Create the hasher
if !m.Hash.Available() {
return "", ErrHashUnavailable
}
hasher := m.Hash.New()
hasher.Write([]byte(signingString))
// Sign the string and return r, s
if r, s, err := ecdsa.Sign(rand.Reader, ecdsaKey, hasher.Sum(nil)); err == nil {
curveBits := ecdsaKey.Curve.Params().BitSize
if m.CurveBits != curveBits {
return "", ErrInvalidKey
}
keyBytes := curveBits / 8
if curveBits%8 > 0 {
keyBytes += 1
}
// We serialize the outpus (r and s) into big-endian byte arrays and pad
// them with zeros on the left to make sure the sizes work out. Both arrays
// must be keyBytes long, and the output must be 2*keyBytes long.
rBytes := r.Bytes()
rBytesPadded := make([]byte, keyBytes)
copy(rBytesPadded[keyBytes-len(rBytes):], rBytes)
sBytes := s.Bytes()
sBytesPadded := make([]byte, keyBytes)
copy(sBytesPadded[keyBytes-len(sBytes):], sBytes)
out := append(rBytesPadded, sBytesPadded...)
return EncodeSegment(out), nil
} else {
return "", err
}
}

67
vendor/github.com/dgrijalva/jwt-go/ecdsa_utils.go generated vendored Normal file
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package jwt
import (
"crypto/ecdsa"
"crypto/x509"
"encoding/pem"
"errors"
)
var (
ErrNotECPublicKey = errors.New("Key is not a valid ECDSA public key")
ErrNotECPrivateKey = errors.New("Key is not a valid ECDSA private key")
)
// Parse PEM encoded Elliptic Curve Private Key Structure
func ParseECPrivateKeyFromPEM(key []byte) (*ecdsa.PrivateKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
// Parse the key
var parsedKey interface{}
if parsedKey, err = x509.ParseECPrivateKey(block.Bytes); err != nil {
return nil, err
}
var pkey *ecdsa.PrivateKey
var ok bool
if pkey, ok = parsedKey.(*ecdsa.PrivateKey); !ok {
return nil, ErrNotECPrivateKey
}
return pkey, nil
}
// Parse PEM encoded PKCS1 or PKCS8 public key
func ParseECPublicKeyFromPEM(key []byte) (*ecdsa.PublicKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
// Parse the key
var parsedKey interface{}
if parsedKey, err = x509.ParsePKIXPublicKey(block.Bytes); err != nil {
if cert, err := x509.ParseCertificate(block.Bytes); err == nil {
parsedKey = cert.PublicKey
} else {
return nil, err
}
}
var pkey *ecdsa.PublicKey
var ok bool
if pkey, ok = parsedKey.(*ecdsa.PublicKey); !ok {
return nil, ErrNotECPublicKey
}
return pkey, nil
}

59
vendor/github.com/dgrijalva/jwt-go/errors.go generated vendored Normal file
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package jwt
import (
"errors"
)
// Error constants
var (
ErrInvalidKey = errors.New("key is invalid")
ErrInvalidKeyType = errors.New("key is of invalid type")
ErrHashUnavailable = errors.New("the requested hash function is unavailable")
)
// The errors that might occur when parsing and validating a token
const (
ValidationErrorMalformed uint32 = 1 << iota // Token is malformed
ValidationErrorUnverifiable // Token could not be verified because of signing problems
ValidationErrorSignatureInvalid // Signature validation failed
// Standard Claim validation errors
ValidationErrorAudience // AUD validation failed
ValidationErrorExpired // EXP validation failed
ValidationErrorIssuedAt // IAT validation failed
ValidationErrorIssuer // ISS validation failed
ValidationErrorNotValidYet // NBF validation failed
ValidationErrorId // JTI validation failed
ValidationErrorClaimsInvalid // Generic claims validation error
)
// Helper for constructing a ValidationError with a string error message
func NewValidationError(errorText string, errorFlags uint32) *ValidationError {
return &ValidationError{
text: errorText,
Errors: errorFlags,
}
}
// The error from Parse if token is not valid
type ValidationError struct {
Inner error // stores the error returned by external dependencies, i.e.: KeyFunc
Errors uint32 // bitfield. see ValidationError... constants
text string // errors that do not have a valid error just have text
}
// Validation error is an error type
func (e ValidationError) Error() string {
if e.Inner != nil {
return e.Inner.Error()
} else if e.text != "" {
return e.text
} else {
return "token is invalid"
}
}
// No errors
func (e *ValidationError) valid() bool {
return e.Errors == 0
}

95
vendor/github.com/dgrijalva/jwt-go/hmac.go generated vendored Normal file
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package jwt
import (
"crypto"
"crypto/hmac"
"errors"
)
// Implements the HMAC-SHA family of signing methods signing methods
// Expects key type of []byte for both signing and validation
type SigningMethodHMAC struct {
Name string
Hash crypto.Hash
}
// Specific instances for HS256 and company
var (
SigningMethodHS256 *SigningMethodHMAC
SigningMethodHS384 *SigningMethodHMAC
SigningMethodHS512 *SigningMethodHMAC
ErrSignatureInvalid = errors.New("signature is invalid")
)
func init() {
// HS256
SigningMethodHS256 = &SigningMethodHMAC{"HS256", crypto.SHA256}
RegisterSigningMethod(SigningMethodHS256.Alg(), func() SigningMethod {
return SigningMethodHS256
})
// HS384
SigningMethodHS384 = &SigningMethodHMAC{"HS384", crypto.SHA384}
RegisterSigningMethod(SigningMethodHS384.Alg(), func() SigningMethod {
return SigningMethodHS384
})
// HS512
SigningMethodHS512 = &SigningMethodHMAC{"HS512", crypto.SHA512}
RegisterSigningMethod(SigningMethodHS512.Alg(), func() SigningMethod {
return SigningMethodHS512
})
}
func (m *SigningMethodHMAC) Alg() string {
return m.Name
}
// Verify the signature of HSXXX tokens. Returns nil if the signature is valid.
func (m *SigningMethodHMAC) Verify(signingString, signature string, key interface{}) error {
// Verify the key is the right type
keyBytes, ok := key.([]byte)
if !ok {
return ErrInvalidKeyType
}
// Decode signature, for comparison
sig, err := DecodeSegment(signature)
if err != nil {
return err
}
// Can we use the specified hashing method?
if !m.Hash.Available() {
return ErrHashUnavailable
}
// This signing method is symmetric, so we validate the signature
// by reproducing the signature from the signing string and key, then
// comparing that against the provided signature.
hasher := hmac.New(m.Hash.New, keyBytes)
hasher.Write([]byte(signingString))
if !hmac.Equal(sig, hasher.Sum(nil)) {
return ErrSignatureInvalid
}
// No validation errors. Signature is good.
return nil
}
// Implements the Sign method from SigningMethod for this signing method.
// Key must be []byte
func (m *SigningMethodHMAC) Sign(signingString string, key interface{}) (string, error) {
if keyBytes, ok := key.([]byte); ok {
if !m.Hash.Available() {
return "", ErrHashUnavailable
}
hasher := hmac.New(m.Hash.New, keyBytes)
hasher.Write([]byte(signingString))
return EncodeSegment(hasher.Sum(nil)), nil
}
return "", ErrInvalidKeyType
}

94
vendor/github.com/dgrijalva/jwt-go/map_claims.go generated vendored Normal file
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package jwt
import (
"encoding/json"
"errors"
// "fmt"
)
// Claims type that uses the map[string]interface{} for JSON decoding
// This is the default claims type if you don't supply one
type MapClaims map[string]interface{}
// Compares the aud claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (m MapClaims) VerifyAudience(cmp string, req bool) bool {
aud, _ := m["aud"].(string)
return verifyAud(aud, cmp, req)
}
// Compares the exp claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (m MapClaims) VerifyExpiresAt(cmp int64, req bool) bool {
switch exp := m["exp"].(type) {
case float64:
return verifyExp(int64(exp), cmp, req)
case json.Number:
v, _ := exp.Int64()
return verifyExp(v, cmp, req)
}
return req == false
}
// Compares the iat claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (m MapClaims) VerifyIssuedAt(cmp int64, req bool) bool {
switch iat := m["iat"].(type) {
case float64:
return verifyIat(int64(iat), cmp, req)
case json.Number:
v, _ := iat.Int64()
return verifyIat(v, cmp, req)
}
return req == false
}
// Compares the iss claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (m MapClaims) VerifyIssuer(cmp string, req bool) bool {
iss, _ := m["iss"].(string)
return verifyIss(iss, cmp, req)
}
// Compares the nbf claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (m MapClaims) VerifyNotBefore(cmp int64, req bool) bool {
switch nbf := m["nbf"].(type) {
case float64:
return verifyNbf(int64(nbf), cmp, req)
case json.Number:
v, _ := nbf.Int64()
return verifyNbf(v, cmp, req)
}
return req == false
}
// Validates time based claims "exp, iat, nbf".
// There is no accounting for clock skew.
// As well, if any of the above claims are not in the token, it will still
// be considered a valid claim.
func (m MapClaims) Valid() error {
vErr := new(ValidationError)
now := TimeFunc().Unix()
if m.VerifyExpiresAt(now, false) == false {
vErr.Inner = errors.New("Token is expired")
vErr.Errors |= ValidationErrorExpired
}
if m.VerifyIssuedAt(now, false) == false {
vErr.Inner = errors.New("Token used before issued")
vErr.Errors |= ValidationErrorIssuedAt
}
if m.VerifyNotBefore(now, false) == false {
vErr.Inner = errors.New("Token is not valid yet")
vErr.Errors |= ValidationErrorNotValidYet
}
if vErr.valid() {
return nil
}
return vErr
}

52
vendor/github.com/dgrijalva/jwt-go/none.go generated vendored Normal file
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package jwt
// Implements the none signing method. This is required by the spec
// but you probably should never use it.
var SigningMethodNone *signingMethodNone
const UnsafeAllowNoneSignatureType unsafeNoneMagicConstant = "none signing method allowed"
var NoneSignatureTypeDisallowedError error
type signingMethodNone struct{}
type unsafeNoneMagicConstant string
func init() {
SigningMethodNone = &signingMethodNone{}
NoneSignatureTypeDisallowedError = NewValidationError("'none' signature type is not allowed", ValidationErrorSignatureInvalid)
RegisterSigningMethod(SigningMethodNone.Alg(), func() SigningMethod {
return SigningMethodNone
})
}
func (m *signingMethodNone) Alg() string {
return "none"
}
// Only allow 'none' alg type if UnsafeAllowNoneSignatureType is specified as the key
func (m *signingMethodNone) Verify(signingString, signature string, key interface{}) (err error) {
// Key must be UnsafeAllowNoneSignatureType to prevent accidentally
// accepting 'none' signing method
if _, ok := key.(unsafeNoneMagicConstant); !ok {
return NoneSignatureTypeDisallowedError
}
// If signing method is none, signature must be an empty string
if signature != "" {
return NewValidationError(
"'none' signing method with non-empty signature",
ValidationErrorSignatureInvalid,
)
}
// Accept 'none' signing method.
return nil
}
// Only allow 'none' signing if UnsafeAllowNoneSignatureType is specified as the key
func (m *signingMethodNone) Sign(signingString string, key interface{}) (string, error) {
if _, ok := key.(unsafeNoneMagicConstant); ok {
return "", nil
}
return "", NoneSignatureTypeDisallowedError
}

148
vendor/github.com/dgrijalva/jwt-go/parser.go generated vendored Normal file
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package jwt
import (
"bytes"
"encoding/json"
"fmt"
"strings"
)
type Parser struct {
ValidMethods []string // If populated, only these methods will be considered valid
UseJSONNumber bool // Use JSON Number format in JSON decoder
SkipClaimsValidation bool // Skip claims validation during token parsing
}
// Parse, validate, and return a token.
// keyFunc will receive the parsed token and should return the key for validating.
// If everything is kosher, err will be nil
func (p *Parser) Parse(tokenString string, keyFunc Keyfunc) (*Token, error) {
return p.ParseWithClaims(tokenString, MapClaims{}, keyFunc)
}
func (p *Parser) ParseWithClaims(tokenString string, claims Claims, keyFunc Keyfunc) (*Token, error) {
token, parts, err := p.ParseUnverified(tokenString, claims)
if err != nil {
return token, err
}
// Verify signing method is in the required set
if p.ValidMethods != nil {
var signingMethodValid = false
var alg = token.Method.Alg()
for _, m := range p.ValidMethods {
if m == alg {
signingMethodValid = true
break
}
}
if !signingMethodValid {
// signing method is not in the listed set
return token, NewValidationError(fmt.Sprintf("signing method %v is invalid", alg), ValidationErrorSignatureInvalid)
}
}
// Lookup key
var key interface{}
if keyFunc == nil {
// keyFunc was not provided. short circuiting validation
return token, NewValidationError("no Keyfunc was provided.", ValidationErrorUnverifiable)
}
if key, err = keyFunc(token); err != nil {
// keyFunc returned an error
if ve, ok := err.(*ValidationError); ok {
return token, ve
}
return token, &ValidationError{Inner: err, Errors: ValidationErrorUnverifiable}
}
vErr := &ValidationError{}
// Validate Claims
if !p.SkipClaimsValidation {
if err := token.Claims.Valid(); err != nil {
// If the Claims Valid returned an error, check if it is a validation error,
// If it was another error type, create a ValidationError with a generic ClaimsInvalid flag set
if e, ok := err.(*ValidationError); !ok {
vErr = &ValidationError{Inner: err, Errors: ValidationErrorClaimsInvalid}
} else {
vErr = e
}
}
}
// Perform validation
token.Signature = parts[2]
if err = token.Method.Verify(strings.Join(parts[0:2], "."), token.Signature, key); err != nil {
vErr.Inner = err
vErr.Errors |= ValidationErrorSignatureInvalid
}
if vErr.valid() {
token.Valid = true
return token, nil
}
return token, vErr
}
// WARNING: Don't use this method unless you know what you're doing
//
// This method parses the token but doesn't validate the signature. It's only
// ever useful in cases where you know the signature is valid (because it has
// been checked previously in the stack) and you want to extract values from
// it.
func (p *Parser) ParseUnverified(tokenString string, claims Claims) (token *Token, parts []string, err error) {
parts = strings.Split(tokenString, ".")
if len(parts) != 3 {
return nil, parts, NewValidationError("token contains an invalid number of segments", ValidationErrorMalformed)
}
token = &Token{Raw: tokenString}
// parse Header
var headerBytes []byte
if headerBytes, err = DecodeSegment(parts[0]); err != nil {
if strings.HasPrefix(strings.ToLower(tokenString), "bearer ") {
return token, parts, NewValidationError("tokenstring should not contain 'bearer '", ValidationErrorMalformed)
}
return token, parts, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
}
if err = json.Unmarshal(headerBytes, &token.Header); err != nil {
return token, parts, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
}
// parse Claims
var claimBytes []byte
token.Claims = claims
if claimBytes, err = DecodeSegment(parts[1]); err != nil {
return token, parts, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
}
dec := json.NewDecoder(bytes.NewBuffer(claimBytes))
if p.UseJSONNumber {
dec.UseNumber()
}
// JSON Decode. Special case for map type to avoid weird pointer behavior
if c, ok := token.Claims.(MapClaims); ok {
err = dec.Decode(&c)
} else {
err = dec.Decode(&claims)
}
// Handle decode error
if err != nil {
return token, parts, &ValidationError{Inner: err, Errors: ValidationErrorMalformed}
}
// Lookup signature method
if method, ok := token.Header["alg"].(string); ok {
if token.Method = GetSigningMethod(method); token.Method == nil {
return token, parts, NewValidationError("signing method (alg) is unavailable.", ValidationErrorUnverifiable)
}
} else {
return token, parts, NewValidationError("signing method (alg) is unspecified.", ValidationErrorUnverifiable)
}
return token, parts, nil
}

101
vendor/github.com/dgrijalva/jwt-go/rsa.go generated vendored Normal file
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package jwt
import (
"crypto"
"crypto/rand"
"crypto/rsa"
)
// Implements the RSA family of signing methods signing methods
// Expects *rsa.PrivateKey for signing and *rsa.PublicKey for validation
type SigningMethodRSA struct {
Name string
Hash crypto.Hash
}
// Specific instances for RS256 and company
var (
SigningMethodRS256 *SigningMethodRSA
SigningMethodRS384 *SigningMethodRSA
SigningMethodRS512 *SigningMethodRSA
)
func init() {
// RS256
SigningMethodRS256 = &SigningMethodRSA{"RS256", crypto.SHA256}
RegisterSigningMethod(SigningMethodRS256.Alg(), func() SigningMethod {
return SigningMethodRS256
})
// RS384
SigningMethodRS384 = &SigningMethodRSA{"RS384", crypto.SHA384}
RegisterSigningMethod(SigningMethodRS384.Alg(), func() SigningMethod {
return SigningMethodRS384
})
// RS512
SigningMethodRS512 = &SigningMethodRSA{"RS512", crypto.SHA512}
RegisterSigningMethod(SigningMethodRS512.Alg(), func() SigningMethod {
return SigningMethodRS512
})
}
func (m *SigningMethodRSA) Alg() string {
return m.Name
}
// Implements the Verify method from SigningMethod
// For this signing method, must be an *rsa.PublicKey structure.
func (m *SigningMethodRSA) Verify(signingString, signature string, key interface{}) error {
var err error
// Decode the signature
var sig []byte
if sig, err = DecodeSegment(signature); err != nil {
return err
}
var rsaKey *rsa.PublicKey
var ok bool
if rsaKey, ok = key.(*rsa.PublicKey); !ok {
return ErrInvalidKeyType
}
// Create hasher
if !m.Hash.Available() {
return ErrHashUnavailable
}
hasher := m.Hash.New()
hasher.Write([]byte(signingString))
// Verify the signature
return rsa.VerifyPKCS1v15(rsaKey, m.Hash, hasher.Sum(nil), sig)
}
// Implements the Sign method from SigningMethod
// For this signing method, must be an *rsa.PrivateKey structure.
func (m *SigningMethodRSA) Sign(signingString string, key interface{}) (string, error) {
var rsaKey *rsa.PrivateKey
var ok bool
// Validate type of key
if rsaKey, ok = key.(*rsa.PrivateKey); !ok {
return "", ErrInvalidKey
}
// Create the hasher
if !m.Hash.Available() {
return "", ErrHashUnavailable
}
hasher := m.Hash.New()
hasher.Write([]byte(signingString))
// Sign the string and return the encoded bytes
if sigBytes, err := rsa.SignPKCS1v15(rand.Reader, rsaKey, m.Hash, hasher.Sum(nil)); err == nil {
return EncodeSegment(sigBytes), nil
} else {
return "", err
}
}

126
vendor/github.com/dgrijalva/jwt-go/rsa_pss.go generated vendored Normal file
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// +build go1.4
package jwt
import (
"crypto"
"crypto/rand"
"crypto/rsa"
)
// Implements the RSAPSS family of signing methods signing methods
type SigningMethodRSAPSS struct {
*SigningMethodRSA
Options *rsa.PSSOptions
}
// Specific instances for RS/PS and company
var (
SigningMethodPS256 *SigningMethodRSAPSS
SigningMethodPS384 *SigningMethodRSAPSS
SigningMethodPS512 *SigningMethodRSAPSS
)
func init() {
// PS256
SigningMethodPS256 = &SigningMethodRSAPSS{
&SigningMethodRSA{
Name: "PS256",
Hash: crypto.SHA256,
},
&rsa.PSSOptions{
SaltLength: rsa.PSSSaltLengthAuto,
Hash: crypto.SHA256,
},
}
RegisterSigningMethod(SigningMethodPS256.Alg(), func() SigningMethod {
return SigningMethodPS256
})
// PS384
SigningMethodPS384 = &SigningMethodRSAPSS{
&SigningMethodRSA{
Name: "PS384",
Hash: crypto.SHA384,
},
&rsa.PSSOptions{
SaltLength: rsa.PSSSaltLengthAuto,
Hash: crypto.SHA384,
},
}
RegisterSigningMethod(SigningMethodPS384.Alg(), func() SigningMethod {
return SigningMethodPS384
})
// PS512
SigningMethodPS512 = &SigningMethodRSAPSS{
&SigningMethodRSA{
Name: "PS512",
Hash: crypto.SHA512,
},
&rsa.PSSOptions{
SaltLength: rsa.PSSSaltLengthAuto,
Hash: crypto.SHA512,
},
}
RegisterSigningMethod(SigningMethodPS512.Alg(), func() SigningMethod {
return SigningMethodPS512
})
}
// Implements the Verify method from SigningMethod
// For this verify method, key must be an rsa.PublicKey struct
func (m *SigningMethodRSAPSS) Verify(signingString, signature string, key interface{}) error {
var err error
// Decode the signature
var sig []byte
if sig, err = DecodeSegment(signature); err != nil {
return err
}
var rsaKey *rsa.PublicKey
switch k := key.(type) {
case *rsa.PublicKey:
rsaKey = k
default:
return ErrInvalidKey
}
// Create hasher
if !m.Hash.Available() {
return ErrHashUnavailable
}
hasher := m.Hash.New()
hasher.Write([]byte(signingString))
return rsa.VerifyPSS(rsaKey, m.Hash, hasher.Sum(nil), sig, m.Options)
}
// Implements the Sign method from SigningMethod
// For this signing method, key must be an rsa.PrivateKey struct
func (m *SigningMethodRSAPSS) Sign(signingString string, key interface{}) (string, error) {
var rsaKey *rsa.PrivateKey
switch k := key.(type) {
case *rsa.PrivateKey:
rsaKey = k
default:
return "", ErrInvalidKeyType
}
// Create the hasher
if !m.Hash.Available() {
return "", ErrHashUnavailable
}
hasher := m.Hash.New()
hasher.Write([]byte(signingString))
// Sign the string and return the encoded bytes
if sigBytes, err := rsa.SignPSS(rand.Reader, rsaKey, m.Hash, hasher.Sum(nil), m.Options); err == nil {
return EncodeSegment(sigBytes), nil
} else {
return "", err
}
}

101
vendor/github.com/dgrijalva/jwt-go/rsa_utils.go generated vendored Normal file
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package jwt
import (
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
)
var (
ErrKeyMustBePEMEncoded = errors.New("Invalid Key: Key must be PEM encoded PKCS1 or PKCS8 private key")
ErrNotRSAPrivateKey = errors.New("Key is not a valid RSA private key")
ErrNotRSAPublicKey = errors.New("Key is not a valid RSA public key")
)
// Parse PEM encoded PKCS1 or PKCS8 private key
func ParseRSAPrivateKeyFromPEM(key []byte) (*rsa.PrivateKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
var parsedKey interface{}
if parsedKey, err = x509.ParsePKCS1PrivateKey(block.Bytes); err != nil {
if parsedKey, err = x509.ParsePKCS8PrivateKey(block.Bytes); err != nil {
return nil, err
}
}
var pkey *rsa.PrivateKey
var ok bool
if pkey, ok = parsedKey.(*rsa.PrivateKey); !ok {
return nil, ErrNotRSAPrivateKey
}
return pkey, nil
}
// Parse PEM encoded PKCS1 or PKCS8 private key protected with password
func ParseRSAPrivateKeyFromPEMWithPassword(key []byte, password string) (*rsa.PrivateKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
var parsedKey interface{}
var blockDecrypted []byte
if blockDecrypted, err = x509.DecryptPEMBlock(block, []byte(password)); err != nil {
return nil, err
}
if parsedKey, err = x509.ParsePKCS1PrivateKey(blockDecrypted); err != nil {
if parsedKey, err = x509.ParsePKCS8PrivateKey(blockDecrypted); err != nil {
return nil, err
}
}
var pkey *rsa.PrivateKey
var ok bool
if pkey, ok = parsedKey.(*rsa.PrivateKey); !ok {
return nil, ErrNotRSAPrivateKey
}
return pkey, nil
}
// Parse PEM encoded PKCS1 or PKCS8 public key
func ParseRSAPublicKeyFromPEM(key []byte) (*rsa.PublicKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
// Parse the key
var parsedKey interface{}
if parsedKey, err = x509.ParsePKIXPublicKey(block.Bytes); err != nil {
if cert, err := x509.ParseCertificate(block.Bytes); err == nil {
parsedKey = cert.PublicKey
} else {
return nil, err
}
}
var pkey *rsa.PublicKey
var ok bool
if pkey, ok = parsedKey.(*rsa.PublicKey); !ok {
return nil, ErrNotRSAPublicKey
}
return pkey, nil
}

35
vendor/github.com/dgrijalva/jwt-go/signing_method.go generated vendored Normal file
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package jwt
import (
"sync"
)
var signingMethods = map[string]func() SigningMethod{}
var signingMethodLock = new(sync.RWMutex)
// Implement SigningMethod to add new methods for signing or verifying tokens.
type SigningMethod interface {
Verify(signingString, signature string, key interface{}) error // Returns nil if signature is valid
Sign(signingString string, key interface{}) (string, error) // Returns encoded signature or error
Alg() string // returns the alg identifier for this method (example: 'HS256')
}
// Register the "alg" name and a factory function for signing method.
// This is typically done during init() in the method's implementation
func RegisterSigningMethod(alg string, f func() SigningMethod) {
signingMethodLock.Lock()
defer signingMethodLock.Unlock()
signingMethods[alg] = f
}
// Get a signing method from an "alg" string
func GetSigningMethod(alg string) (method SigningMethod) {
signingMethodLock.RLock()
defer signingMethodLock.RUnlock()
if methodF, ok := signingMethods[alg]; ok {
method = methodF()
}
return
}

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package jwt
import (
"encoding/base64"
"encoding/json"
"strings"
"time"
)
// TimeFunc provides the current time when parsing token to validate "exp" claim (expiration time).
// You can override it to use another time value. This is useful for testing or if your
// server uses a different time zone than your tokens.
var TimeFunc = time.Now
// Parse methods use this callback function to supply
// the key for verification. The function receives the parsed,
// but unverified Token. This allows you to use properties in the
// Header of the token (such as `kid`) to identify which key to use.
type Keyfunc func(*Token) (interface{}, error)
// A JWT Token. Different fields will be used depending on whether you're
// creating or parsing/verifying a token.
type Token struct {
Raw string // The raw token. Populated when you Parse a token
Method SigningMethod // The signing method used or to be used
Header map[string]interface{} // The first segment of the token
Claims Claims // The second segment of the token
Signature string // The third segment of the token. Populated when you Parse a token
Valid bool // Is the token valid? Populated when you Parse/Verify a token
}
// Create a new Token. Takes a signing method
func New(method SigningMethod) *Token {
return NewWithClaims(method, MapClaims{})
}
func NewWithClaims(method SigningMethod, claims Claims) *Token {
return &Token{
Header: map[string]interface{}{
"typ": "JWT",
"alg": method.Alg(),
},
Claims: claims,
Method: method,
}
}
// Get the complete, signed token
func (t *Token) SignedString(key interface{}) (string, error) {
var sig, sstr string
var err error
if sstr, err = t.SigningString(); err != nil {
return "", err
}
if sig, err = t.Method.Sign(sstr, key); err != nil {
return "", err
}
return strings.Join([]string{sstr, sig}, "."), nil
}
// Generate the signing string. This is the
// most expensive part of the whole deal. Unless you
// need this for something special, just go straight for
// the SignedString.
func (t *Token) SigningString() (string, error) {
var err error
parts := make([]string, 2)
for i, _ := range parts {
var jsonValue []byte
if i == 0 {
if jsonValue, err = json.Marshal(t.Header); err != nil {
return "", err
}
} else {
if jsonValue, err = json.Marshal(t.Claims); err != nil {
return "", err
}
}
parts[i] = EncodeSegment(jsonValue)
}
return strings.Join(parts, "."), nil
}
// Parse, validate, and return a token.
// keyFunc will receive the parsed token and should return the key for validating.
// If everything is kosher, err will be nil
func Parse(tokenString string, keyFunc Keyfunc) (*Token, error) {
return new(Parser).Parse(tokenString, keyFunc)
}
func ParseWithClaims(tokenString string, claims Claims, keyFunc Keyfunc) (*Token, error) {
return new(Parser).ParseWithClaims(tokenString, claims, keyFunc)
}
// Encode JWT specific base64url encoding with padding stripped
func EncodeSegment(seg []byte) string {
return strings.TrimRight(base64.URLEncoding.EncodeToString(seg), "=")
}
// Decode JWT specific base64url encoding with padding stripped
func DecodeSegment(seg string) ([]byte, error) {
if l := len(seg) % 4; l > 0 {
seg += strings.Repeat("=", 4-l)
}
return base64.URLEncoding.DecodeString(seg)
}

24
vendor/github.com/dsoprea/go-exif/.travis.yml generated vendored Normal file
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language: go
go:
- master
- stable
- "1.14"
- "1.13"
- "1.12"
env:
- GO111MODULE=on
install:
- go get -t ./...
script:
# v1
- go test -v .
- go test -v ./exif-read-tool
# v2
- cd v2
- go test -v ./...
- cd ..
# v3. Coverage reports comes from this.
- cd v3
- go test -v ./... -coverprofile=coverage.txt -covermode=atomic
after_success:
- curl -s https://codecov.io/bash | bash

9
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MIT LICENSE
Copyright 2019 Dustin Oprea
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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[![Build Status](https://travis-ci.org/dsoprea/go-exif.svg?branch=master)](https://travis-ci.org/dsoprea/go-exif)
[![codecov](https://codecov.io/gh/dsoprea/go-exif/branch/master/graph/badge.svg)](https://codecov.io/gh/dsoprea/go-exif)
[![Go Report Card](https://goreportcard.com/badge/github.com/dsoprea/go-exif/v3)](https://goreportcard.com/report/github.com/dsoprea/go-exif/v3)
[![GoDoc](https://godoc.org/github.com/dsoprea/go-exif/v3?status.svg)](https://godoc.org/github.com/dsoprea/go-exif/v3)
# Overview
This package provides native Go functionality to parse an existing EXIF block, update an existing EXIF block, or add a new EXIF block.
# Getting
To get the project and dependencies:
```
$ go get -t github.com/dsoprea/go-exif/v3
```
# Scope
This project is concerned only with parsing and encoding raw EXIF data. It does
not understand specific file-formats. This package assumes you know how to
extract the raw EXIF data from a file, such as a JPEG, and, if you want to
update it, know how to write it back. File-specific formats are not the concern
of *go-exif*, though we provide
[exif.SearchAndExtractExif][search-and-extract-exif] and
[exif.SearchFileAndExtractExif][search-file-and-extract-exif] as brute-force
search mechanisms that will help you explore the EXIF information for newer
formats that you might not yet have any way to parse.
That said, the author also provides the following projects to support the
efficient processing of the corresponding image formats:
- [go-jpeg-image-structure](https://github.com/dsoprea/go-jpeg-image-structure)
- [go-png-image-structure](https://github.com/dsoprea/go-png-image-structure)
- [go-tiff-image-structure](https://github.com/dsoprea/go-tiff-image-structure)
- [go-heic-exif-extractor](https://github.com/dsoprea/go-heic-exif-extractor)
See the [SetExif example in go-jpeg-image-structure][jpeg-set-exif] for
practical information on getting started with JPEG files.
# Usage
The package provides a set of [working examples][examples] and is covered by
unit-tests. Please look to these for getting familiar with how to read and write
EXIF.
Create an instance of the `Exif` type and call `Scan()` with a byte-slice, where
the first byte is the beginning of the raw EXIF data. You may pass a callback
that will be invoked for every tag or `nil` if you do not want one. If no
callback is given, you are effectively just validating the structure or parsing
of the image.
Obviously, it is most efficient to properly parse the media file and then
provide the specific EXIF data to be parsed, but there is also a heuristic for
finding the EXIF data within the media blob, directly. This means that, at least
for testing or curiosity, **you do not have to parse or even understand the
format of image or audio file in order to find and decode the EXIF information
inside of it.** See the usage of the `SearchAndExtractExif` method in the
example.
The library often refers to an IFD with an "IFD path" (e.g. IFD/Exif,
IFD/GPSInfo). A "fully-qualified" IFD-path is one that includes an index
describing which specific sibling IFD is being referred to if not the first one
(e.g. IFD1, the IFD where the thumbnail is expressed per the TIFF standard).
There is an "IFD mapping" and a "tag index" that must be created and passed to
the library from the top. These contain all of the knowledge of the IFD
hierarchies and their tag-IDs (the IFD mapping) and the tags that they are
allowed to host (the tag index). There are convenience functions to load them
with the standard TIFF information, but you, alternatively, may choose
something totally different (to support parsing any kind of EXIF data that does
not follow or is not relevant to TIFF at all).
# Standards and Customization
This project is configuration driven. By default, it has no knowledge of tags
and IDs until you load them prior to using (which is incorporated in the
examples). You are just as easily able to add additional custom IFDs and custom
tags for them. If desired, you could completely ignore the standard information
and load *totally* non-standard IFDs and tags.
This would be useful for divergent implementations that add non-standard
information to images. It would also be useful if there is some need to just
store a flat list of tags in an image for simplified, proprietary usage.
# Reader Tool
There is a runnable reading/dumping tool included:
```
$ go get github.com/dsoprea/go-exif/v3/command/exif-read-tool
$ exif-read-tool --filepath "<media file-path>"
```
Example output:
```
IFD-PATH=[IFD] ID=(0x010f) NAME=[Make] COUNT=(6) TYPE=[ASCII] VALUE=[Canon]
IFD-PATH=[IFD] ID=(0x0110) NAME=[Model] COUNT=(22) TYPE=[ASCII] VALUE=[Canon EOS 5D Mark III]
IFD-PATH=[IFD] ID=(0x0112) NAME=[Orientation] COUNT=(1) TYPE=[SHORT] VALUE=[1]
IFD-PATH=[IFD] ID=(0x011a) NAME=[XResolution] COUNT=(1) TYPE=[RATIONAL] VALUE=[72/1]
IFD-PATH=[IFD] ID=(0x011b) NAME=[YResolution] COUNT=(1) TYPE=[RATIONAL] VALUE=[72/1]
IFD-PATH=[IFD] ID=(0x0128) NAME=[ResolutionUnit] COUNT=(1) TYPE=[SHORT] VALUE=[2]
IFD-PATH=[IFD] ID=(0x0132) NAME=[DateTime] COUNT=(20) TYPE=[ASCII] VALUE=[2017:12:02 08:18:50]
...
```
You can also print the raw, parsed data as JSON:
```
$ exif-read-tool --filepath "<media file-path>" -json
```
Example output:
```
[
{
"ifd_path": "IFD",
"fq_ifd_path": "IFD",
"ifd_index": 0,
"tag_id": 271,
"tag_name": "Make",
"tag_type_id": 2,
"tag_type_name": "ASCII",
"unit_count": 6,
"value": "Canon",
"value_string": "Canon"
},
{
"ifd_path": "IFD",
...
```
# Testing
The traditional method:
```
$ go test github.com/dsoprea/go-exif/v3/...
```
# Release Notes
## v3 Release
This release primarily introduces an interchangeable data-layer, where any
`io.ReadSeeker` can be used to read EXIF data rather than necessarily loading
the EXIF blob into memory first.
Several backwards-incompatible clean-ups were also included in this release. See
[releases][releases] for more information.
## v2 Release
Features a heavily reflowed interface that makes usage much simpler. The
undefined-type tag-processing (which affects most photographic images) has also
been overhauled and streamlined. It is now complete and stable. Adoption is
strongly encouraged.
# *Contributing*
EXIF has an excellently-documented structure but there are a lot of devices and
manufacturers out there. There are only so many files that we can personally
find to test against, and most of these are images that have been generated only
in the past few years. JPEG, being the largest implementor of EXIF, has been
around for even longer (but not much). Therefore, there is a lot of
compatibility to test for.
**If you are able to help by running the included reader-tool against all of the
EXIF-compatible files you have, it would be deeply appreciated. This is mostly
going to be JPEG files (but not all variations). If you are able to test a large
number of files (thousands or millions) then please post an issue mentioning how
many files you have processed. If you had failures, then please share them and
try to support efforts to understand them.**
If you are able to test 100K+ files, I will give you credit on the project. The
further back in time your images reach, the higher in the list your name/company
will go.
# Contributors/Testing
Thank you to the following users for solving non-trivial issues, supporting the
project with solving edge-case problems in specific images, or otherwise
providing their non-trivial time or image corpus to test go-exif:
- [philip-firstorder](https://github.com/philip-firstorder) (200K images)
- [matchstick](https://github.com/matchstick) (102K images)
In addition to these, it has been tested on my own collection, north of 478K
images.
[search-and-extract-exif]: https://godoc.org/github.com/dsoprea/go-exif/v3#SearchAndExtractExif
[search-file-and-extract-exif]: https://godoc.org/github.com/dsoprea/go-exif/v3#SearchFileAndExtractExif
[jpeg-set-exif]: https://godoc.org/github.com/dsoprea/go-jpeg-image-structure#example-SegmentList-SetExif
[examples]: https://godoc.org/github.com/dsoprea/go-exif/v3#pkg-examples
[releases]: https://github.com/dsoprea/go-exif/releases

10
vendor/github.com/dsoprea/go-exif/error.go generated vendored Normal file
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package exif
import (
"errors"
)
var (
ErrTagNotFound = errors.New("tag not found")
ErrTagNotStandard = errors.New("tag not a standard tag")
)

247
vendor/github.com/dsoprea/go-exif/exif.go generated vendored Normal file
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package exif
import (
"bytes"
"errors"
"fmt"
"os"
"encoding/binary"
"io/ioutil"
"github.com/dsoprea/go-logging"
)
const (
// ExifAddressableAreaStart is the absolute offset in the file that all
// offsets are relative to.
ExifAddressableAreaStart = uint32(0x0)
// ExifDefaultFirstIfdOffset is essentially the number of bytes in addition
// to `ExifAddressableAreaStart` that you have to move in order to escape
// the rest of the header and get to the earliest point where we can put
// stuff (which has to be the first IFD). This is the size of the header
// sequence containing the two-character byte-order, two-character fixed-
// bytes, and the four bytes describing the first-IFD offset.
ExifDefaultFirstIfdOffset = uint32(2 + 2 + 4)
)
var (
exifLogger = log.NewLogger("exif.exif")
// EncodeDefaultByteOrder is the default byte-order for encoding operations.
EncodeDefaultByteOrder = binary.BigEndian
// Default byte order for tests.
TestDefaultByteOrder = binary.BigEndian
BigEndianBoBytes = [2]byte{'M', 'M'}
LittleEndianBoBytes = [2]byte{'I', 'I'}
ByteOrderLookup = map[[2]byte]binary.ByteOrder{
BigEndianBoBytes: binary.BigEndian,
LittleEndianBoBytes: binary.LittleEndian,
}
ByteOrderLookupR = map[binary.ByteOrder][2]byte{
binary.BigEndian: BigEndianBoBytes,
binary.LittleEndian: LittleEndianBoBytes,
}
ExifFixedBytesLookup = map[binary.ByteOrder][2]byte{
binary.LittleEndian: {0x2a, 0x00},
binary.BigEndian: {0x00, 0x2a},
}
)
var (
ErrNoExif = errors.New("no exif data")
ErrExifHeaderError = errors.New("exif header error")
)
// SearchAndExtractExif returns a slice from the beginning of the EXIF data to
// end of the file (it's not practical to try and calculate where the data
// actually ends; it needs to be formally parsed).
func SearchAndExtractExif(data []byte) (rawExif []byte, err error) {
defer func() {
if state := recover(); state != nil {
err := log.Wrap(state.(error))
log.Panic(err)
}
}()
// Search for the beginning of the EXIF information. The EXIF is near the
// beginning of our/most JPEGs, so this has a very low cost.
foundAt := -1
for i := 0; i < len(data); i++ {
if _, err := ParseExifHeader(data[i:]); err == nil {
foundAt = i
break
} else if log.Is(err, ErrNoExif) == false {
return nil, err
}
}
if foundAt == -1 {
return nil, ErrNoExif
}
return data[foundAt:], nil
}
// SearchFileAndExtractExif returns a slice from the beginning of the EXIF data
// to the end of the file (it's not practical to try and calculate where the
// data actually ends).
func SearchFileAndExtractExif(filepath string) (rawExif []byte, err error) {
defer func() {
if state := recover(); state != nil {
err := log.Wrap(state.(error))
log.Panic(err)
}
}()
// Open the file.
f, err := os.Open(filepath)
log.PanicIf(err)
defer f.Close()
data, err := ioutil.ReadAll(f)
log.PanicIf(err)
rawExif, err = SearchAndExtractExif(data)
log.PanicIf(err)
return rawExif, nil
}
type ExifHeader struct {
ByteOrder binary.ByteOrder
FirstIfdOffset uint32
}
func (eh ExifHeader) String() string {
return fmt.Sprintf("ExifHeader<BYTE-ORDER=[%v] FIRST-IFD-OFFSET=(0x%02x)>", eh.ByteOrder, eh.FirstIfdOffset)
}
// ParseExifHeader parses the bytes at the very top of the header.
//
// This will panic with ErrNoExif on any data errors so that we can double as
// an EXIF-detection routine.
func ParseExifHeader(data []byte) (eh ExifHeader, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// Good reference:
//
// CIPA DC-008-2016; JEITA CP-3451D
// -> http://www.cipa.jp/std/documents/e/DC-008-Translation-2016-E.pdf
if len(data) < 2 {
exifLogger.Warningf(nil, "Not enough data for EXIF header (1): (%d)", len(data))
return eh, ErrNoExif
}
byteOrderBytes := [2]byte{data[0], data[1]}
byteOrder, found := ByteOrderLookup[byteOrderBytes]
if found == false {
// exifLogger.Warningf(nil, "EXIF byte-order not recognized: [%v]", byteOrderBytes)
return eh, ErrNoExif
}
if len(data) < 4 {
exifLogger.Warningf(nil, "Not enough data for EXIF header (2): (%d)", len(data))
return eh, ErrNoExif
}
fixedBytes := [2]byte{data[2], data[3]}
expectedFixedBytes := ExifFixedBytesLookup[byteOrder]
if fixedBytes != expectedFixedBytes {
// exifLogger.Warningf(nil, "EXIF header fixed-bytes should be [%v] but are: [%v]", expectedFixedBytes, fixedBytes)
return eh, ErrNoExif
}
if len(data) < 2 {
exifLogger.Warningf(nil, "Not enough data for EXIF header (3): (%d)", len(data))
return eh, ErrNoExif
}
firstIfdOffset := byteOrder.Uint32(data[4:8])
eh = ExifHeader{
ByteOrder: byteOrder,
FirstIfdOffset: firstIfdOffset,
}
return eh, nil
}
// Visit recursively invokes a callback for every tag.
func Visit(rootIfdName string, ifdMapping *IfdMapping, tagIndex *TagIndex, exifData []byte, visitor RawTagVisitor) (eh ExifHeader, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
eh, err = ParseExifHeader(exifData)
log.PanicIf(err)
ie := NewIfdEnumerate(ifdMapping, tagIndex, exifData, eh.ByteOrder)
err = ie.Scan(rootIfdName, eh.FirstIfdOffset, visitor, true)
log.PanicIf(err)
return eh, nil
}
// Collect recursively builds a static structure of all IFDs and tags.
func Collect(ifdMapping *IfdMapping, tagIndex *TagIndex, exifData []byte) (eh ExifHeader, index IfdIndex, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
eh, err = ParseExifHeader(exifData)
log.PanicIf(err)
ie := NewIfdEnumerate(ifdMapping, tagIndex, exifData, eh.ByteOrder)
index, err = ie.Collect(eh.FirstIfdOffset, true)
log.PanicIf(err)
return eh, index, nil
}
// BuildExifHeader constructs the bytes that go in the very beginning.
func BuildExifHeader(byteOrder binary.ByteOrder, firstIfdOffset uint32) (headerBytes []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
b := new(bytes.Buffer)
// This is the point in the data that all offsets are relative to.
boBytes := ByteOrderLookupR[byteOrder]
_, err = b.WriteString(string(boBytes[:]))
log.PanicIf(err)
fixedBytes := ExifFixedBytesLookup[byteOrder]
_, err = b.Write(fixedBytes[:])
log.PanicIf(err)
err = binary.Write(b, byteOrder, firstIfdOffset)
log.PanicIf(err)
return b.Bytes(), nil
}

11
vendor/github.com/dsoprea/go-exif/go.mod generated vendored Normal file
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@ -0,0 +1,11 @@
module github.com/dsoprea/go-exif
go 1.13
require (
github.com/dsoprea/go-logging v0.0.0-20190624164917-c4f10aab7696
github.com/go-errors/errors v1.0.1 // indirect
github.com/golang/geo v0.0.0-20190916061304-5b978397cfec
golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553 // indirect
gopkg.in/yaml.v2 v2.2.7
)

14
vendor/github.com/dsoprea/go-exif/go.sum generated vendored Normal file
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@ -0,0 +1,14 @@
github.com/dsoprea/go-logging v0.0.0-20190624164917-c4f10aab7696 h1:VGFnZAcLwPpt1sHlAxml+pGLZz9A2s+K/s1YNhPC91Y=
github.com/dsoprea/go-logging v0.0.0-20190624164917-c4f10aab7696/go.mod h1:Nm/x2ZUNRW6Fe5C3LxdY1PyZY5wmDv/s5dkPJ/VB3iA=
github.com/go-errors/errors v1.0.1 h1:LUHzmkK3GUKUrL/1gfBUxAHzcev3apQlezX/+O7ma6w=
github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm6/TyX73Q=
github.com/golang/geo v0.0.0-20190916061304-5b978397cfec h1:lJwO/92dFXWeXOZdoGXgptLmNLwynMSHUmU6besqtiw=
github.com/golang/geo v0.0.0-20190916061304-5b978397cfec/go.mod h1:QZ0nwyI2jOfgRAoBvP+ab5aRr7c9x7lhGEJrKvBwjWI=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553 h1:efeOvDhwQ29Dj3SdAV/MJf8oukgn+8D8WgaCaRMchF8=
golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

56
vendor/github.com/dsoprea/go-exif/gps.go generated vendored Normal file
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package exif
import (
"errors"
"fmt"
"time"
"github.com/golang/geo/s2"
)
var (
ErrGpsCoordinatesNotValid = errors.New("GPS coordinates not valid")
)
type GpsDegrees struct {
Orientation byte
Degrees, Minutes, Seconds float64
}
func (d GpsDegrees) String() string {
return fmt.Sprintf("Degrees<O=[%s] D=(%g) M=(%g) S=(%g)>", string([]byte{d.Orientation}), d.Degrees, d.Minutes, d.Seconds)
}
func (d GpsDegrees) Decimal() float64 {
decimal := float64(d.Degrees) + float64(d.Minutes)/60.0 + float64(d.Seconds)/3600.0
if d.Orientation == 'S' || d.Orientation == 'W' {
return -decimal
} else {
return decimal
}
}
type GpsInfo struct {
Latitude, Longitude GpsDegrees
Altitude int
Timestamp time.Time
}
func (gi *GpsInfo) String() string {
return fmt.Sprintf("GpsInfo<LAT=(%.05f) LON=(%.05f) ALT=(%d) TIME=[%s]>", gi.Latitude.Decimal(), gi.Longitude.Decimal(), gi.Altitude, gi.Timestamp)
}
func (gi *GpsInfo) S2CellId() s2.CellID {
latitude := gi.Latitude.Decimal()
longitude := gi.Longitude.Decimal()
ll := s2.LatLngFromDegrees(latitude, longitude)
cellId := s2.CellIDFromLatLng(ll)
if cellId.IsValid() == false {
panic(ErrGpsCoordinatesNotValid)
}
return cellId
}

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vendor/github.com/dsoprea/go-exif/ifd.go generated vendored Normal file
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package exif
import (
"errors"
"fmt"
"strings"
"github.com/dsoprea/go-logging"
)
const (
// IFD names. The paths that we referred to the IFDs with are comprised of
// these.
IfdStandard = "IFD"
IfdExif = "Exif"
IfdGps = "GPSInfo"
IfdIop = "Iop"
// Tag IDs for child IFDs.
IfdExifId = 0x8769
IfdGpsId = 0x8825
IfdIopId = 0xA005
// Just a placeholder.
IfdRootId = 0x0000
// The paths of the standard IFDs expressed in the standard IFD-mappings
// and as the group-names in the tag data.
IfdPathStandard = "IFD"
IfdPathStandardExif = "IFD/Exif"
IfdPathStandardExifIop = "IFD/Exif/Iop"
IfdPathStandardGps = "IFD/GPSInfo"
)
var (
ifdLogger = log.NewLogger("exif.ifd")
)
var (
ErrChildIfdNotMapped = errors.New("no child-IFD for that tag-ID under parent")
)
// type IfdIdentity struct {
// ParentIfdName string
// IfdName string
// }
// func (ii IfdIdentity) String() string {
// return fmt.Sprintf("IfdIdentity<PARENT-NAME=[%s] NAME=[%s]>", ii.ParentIfdName, ii.IfdName)
// }
type MappedIfd struct {
ParentTagId uint16
Placement []uint16
Path []string
Name string
TagId uint16
Children map[uint16]*MappedIfd
}
func (mi *MappedIfd) String() string {
pathPhrase := mi.PathPhrase()
return fmt.Sprintf("MappedIfd<(0x%04X) [%s] PATH=[%s]>", mi.TagId, mi.Name, pathPhrase)
}
func (mi *MappedIfd) PathPhrase() string {
return strings.Join(mi.Path, "/")
}
// IfdMapping describes all of the IFDs that we currently recognize.
type IfdMapping struct {
rootNode *MappedIfd
}
func NewIfdMapping() (ifdMapping *IfdMapping) {
rootNode := &MappedIfd{
Path: make([]string, 0),
Children: make(map[uint16]*MappedIfd),
}
return &IfdMapping{
rootNode: rootNode,
}
}
func NewIfdMappingWithStandard() (ifdMapping *IfdMapping) {
defer func() {
if state := recover(); state != nil {
err := log.Wrap(state.(error))
log.Panic(err)
}
}()
im := NewIfdMapping()
err := LoadStandardIfds(im)
log.PanicIf(err)
return im
}
func (im *IfdMapping) Get(parentPlacement []uint16) (childIfd *MappedIfd, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ptr := im.rootNode
for _, tagId := range parentPlacement {
if descendantPtr, found := ptr.Children[tagId]; found == false {
log.Panicf("ifd child with tag-ID (%04x) not registered: [%s]", tagId, ptr.PathPhrase())
} else {
ptr = descendantPtr
}
}
return ptr, nil
}
func (im *IfdMapping) GetWithPath(pathPhrase string) (mi *MappedIfd, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
if pathPhrase == "" {
log.Panicf("path-phrase is empty")
}
path := strings.Split(pathPhrase, "/")
ptr := im.rootNode
for _, name := range path {
var hit *MappedIfd
for _, mi := range ptr.Children {
if mi.Name == name {
hit = mi
break
}
}
if hit == nil {
log.Panicf("ifd child with name [%s] not registered: [%s]", name, ptr.PathPhrase())
}
ptr = hit
}
return ptr, nil
}
// GetChild is a convenience function to get the child path for a given parent
// placement and child tag-ID.
func (im *IfdMapping) GetChild(parentPathPhrase string, tagId uint16) (mi *MappedIfd, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
mi, err = im.GetWithPath(parentPathPhrase)
log.PanicIf(err)
for _, childMi := range mi.Children {
if childMi.TagId == tagId {
return childMi, nil
}
}
// Whether or not an IFD is defined in data, such an IFD is not registered
// and would be unknown.
log.Panic(ErrChildIfdNotMapped)
return nil, nil
}
type IfdTagIdAndIndex struct {
Name string
TagId uint16
Index int
}
func (itii IfdTagIdAndIndex) String() string {
return fmt.Sprintf("IfdTagIdAndIndex<NAME=[%s] ID=(%04x) INDEX=(%d)>", itii.Name, itii.TagId, itii.Index)
}
// ResolvePath takes a list of names, which can also be suffixed with indices
// (to identify the second, third, etc.. sibling IFD) and returns a list of
// tag-IDs and those indices.
//
// Example:
//
// - IFD/Exif/Iop
// - IFD0/Exif/Iop
//
// This is the only call that supports adding the numeric indices.
func (im *IfdMapping) ResolvePath(pathPhrase string) (lineage []IfdTagIdAndIndex, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
pathPhrase = strings.TrimSpace(pathPhrase)
if pathPhrase == "" {
log.Panicf("can not resolve empty path-phrase")
}
path := strings.Split(pathPhrase, "/")
lineage = make([]IfdTagIdAndIndex, len(path))
ptr := im.rootNode
empty := IfdTagIdAndIndex{}
for i, name := range path {
indexByte := name[len(name)-1]
index := 0
if indexByte >= '0' && indexByte <= '9' {
index = int(indexByte - '0')
name = name[:len(name)-1]
}
itii := IfdTagIdAndIndex{}
for _, mi := range ptr.Children {
if mi.Name != name {
continue
}
itii.Name = name
itii.TagId = mi.TagId
itii.Index = index
ptr = mi
break
}
if itii == empty {
log.Panicf("ifd child with name [%s] not registered: [%s]", name, pathPhrase)
}
lineage[i] = itii
}
return lineage, nil
}
func (im *IfdMapping) FqPathPhraseFromLineage(lineage []IfdTagIdAndIndex) (fqPathPhrase string) {
fqPathParts := make([]string, len(lineage))
for i, itii := range lineage {
if itii.Index > 0 {
fqPathParts[i] = fmt.Sprintf("%s%d", itii.Name, itii.Index)
} else {
fqPathParts[i] = itii.Name
}
}
return strings.Join(fqPathParts, "/")
}
func (im *IfdMapping) PathPhraseFromLineage(lineage []IfdTagIdAndIndex) (pathPhrase string) {
pathParts := make([]string, len(lineage))
for i, itii := range lineage {
pathParts[i] = itii.Name
}
return strings.Join(pathParts, "/")
}
// StripPathPhraseIndices returns a non-fully-qualified path-phrase (no
// indices).
func (im *IfdMapping) StripPathPhraseIndices(pathPhrase string) (strippedPathPhrase string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
lineage, err := im.ResolvePath(pathPhrase)
log.PanicIf(err)
strippedPathPhrase = im.PathPhraseFromLineage(lineage)
return strippedPathPhrase, nil
}
// Add puts the given IFD at the given position of the tree. The position of the
// tree is referred to as the placement and is represented by a set of tag-IDs,
// where the leftmost is the root tag and the tags going to the right are
// progressive descendants.
func (im *IfdMapping) Add(parentPlacement []uint16, tagId uint16, name string) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): !! It would be nicer to provide a list of names in the placement rather than tag-IDs.
ptr, err := im.Get(parentPlacement)
log.PanicIf(err)
path := make([]string, len(parentPlacement)+1)
if len(parentPlacement) > 0 {
copy(path, ptr.Path)
}
path[len(path)-1] = name
placement := make([]uint16, len(parentPlacement)+1)
if len(placement) > 0 {
copy(placement, ptr.Placement)
}
placement[len(placement)-1] = tagId
childIfd := &MappedIfd{
ParentTagId: ptr.TagId,
Path: path,
Placement: placement,
Name: name,
TagId: tagId,
Children: make(map[uint16]*MappedIfd),
}
if _, found := ptr.Children[tagId]; found == true {
log.Panicf("child IFD with tag-ID (%04x) already registered under IFD [%s] with tag-ID (%04x)", tagId, ptr.Name, ptr.TagId)
}
ptr.Children[tagId] = childIfd
return nil
}
func (im *IfdMapping) dumpLineages(stack []*MappedIfd, input []string) (output []string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
currentIfd := stack[len(stack)-1]
output = input
for _, childIfd := range currentIfd.Children {
stackCopy := make([]*MappedIfd, len(stack)+1)
copy(stackCopy, stack)
stackCopy[len(stack)] = childIfd
// Add to output, but don't include the obligatory root node.
parts := make([]string, len(stackCopy)-1)
for i, mi := range stackCopy[1:] {
parts[i] = mi.Name
}
output = append(output, strings.Join(parts, "/"))
output, err = im.dumpLineages(stackCopy, output)
log.PanicIf(err)
}
return output, nil
}
func (im *IfdMapping) DumpLineages() (output []string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
stack := []*MappedIfd{im.rootNode}
output = make([]string, 0)
output, err = im.dumpLineages(stack, output)
log.PanicIf(err)
return output, nil
}
func LoadStandardIfds(im *IfdMapping) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
err = im.Add([]uint16{}, IfdRootId, IfdStandard)
log.PanicIf(err)
err = im.Add([]uint16{IfdRootId}, IfdExifId, IfdExif)
log.PanicIf(err)
err = im.Add([]uint16{IfdRootId, IfdExifId}, IfdIopId, IfdIop)
log.PanicIf(err)
err = im.Add([]uint16{IfdRootId}, IfdGpsId, IfdGps)
log.PanicIf(err)
return nil
}

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vendor/github.com/dsoprea/go-exif/ifd_builder.go generated vendored Normal file
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vendor/github.com/dsoprea/go-exif/ifd_builder_encode.go generated vendored Normal file
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package exif
import (
"bytes"
"fmt"
"strings"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
const (
// Tag-ID + Tag-Type + Unit-Count + Value/Offset.
IfdTagEntrySize = uint32(2 + 2 + 4 + 4)
)
type ByteWriter struct {
b *bytes.Buffer
byteOrder binary.ByteOrder
}
func NewByteWriter(b *bytes.Buffer, byteOrder binary.ByteOrder) (bw *ByteWriter) {
return &ByteWriter{
b: b,
byteOrder: byteOrder,
}
}
func (bw ByteWriter) writeAsBytes(value interface{}) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
err = binary.Write(bw.b, bw.byteOrder, value)
log.PanicIf(err)
return nil
}
func (bw ByteWriter) WriteUint32(value uint32) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
err = bw.writeAsBytes(value)
log.PanicIf(err)
return nil
}
func (bw ByteWriter) WriteUint16(value uint16) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
err = bw.writeAsBytes(value)
log.PanicIf(err)
return nil
}
func (bw ByteWriter) WriteFourBytes(value []byte) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
len_ := len(value)
if len_ != 4 {
log.Panicf("value is not four-bytes: (%d)", len_)
}
_, err = bw.b.Write(value)
log.PanicIf(err)
return nil
}
// ifdOffsetIterator keeps track of where the next IFD should be written by
// keeping track of where the offsets start, the data that has been added, and
// bumping the offset *when* the data is added.
type ifdDataAllocator struct {
offset uint32
b bytes.Buffer
}
func newIfdDataAllocator(ifdDataAddressableOffset uint32) *ifdDataAllocator {
return &ifdDataAllocator{
offset: ifdDataAddressableOffset,
}
}
func (ida *ifdDataAllocator) Allocate(value []byte) (offset uint32, err error) {
_, err = ida.b.Write(value)
log.PanicIf(err)
offset = ida.offset
ida.offset += uint32(len(value))
return offset, nil
}
func (ida *ifdDataAllocator) NextOffset() uint32 {
return ida.offset
}
func (ida *ifdDataAllocator) Bytes() []byte {
return ida.b.Bytes()
}
// IfdByteEncoder converts an IB to raw bytes (for writing) while also figuring
// out all of the allocations and indirection that is required for extended
// data.
type IfdByteEncoder struct {
// journal holds a list of actions taken while encoding.
journal [][3]string
}
func NewIfdByteEncoder() (ibe *IfdByteEncoder) {
return &IfdByteEncoder{
journal: make([][3]string, 0),
}
}
func (ibe *IfdByteEncoder) Journal() [][3]string {
return ibe.journal
}
func (ibe *IfdByteEncoder) TableSize(entryCount int) uint32 {
// Tag-Count + (Entry-Size * Entry-Count) + Next-IFD-Offset.
return uint32(2) + (IfdTagEntrySize * uint32(entryCount)) + uint32(4)
}
func (ibe *IfdByteEncoder) pushToJournal(where, direction, format string, args ...interface{}) {
event := [3]string{
direction,
where,
fmt.Sprintf(format, args...),
}
ibe.journal = append(ibe.journal, event)
}
// PrintJournal prints a hierarchical representation of the steps taken during
// encoding.
func (ibe *IfdByteEncoder) PrintJournal() {
maxWhereLength := 0
for _, event := range ibe.journal {
where := event[1]
len_ := len(where)
if len_ > maxWhereLength {
maxWhereLength = len_
}
}
level := 0
for i, event := range ibe.journal {
direction := event[0]
where := event[1]
message := event[2]
if direction != ">" && direction != "<" && direction != "-" {
log.Panicf("journal operation not valid: [%s]", direction)
}
if direction == "<" {
if level <= 0 {
log.Panicf("journal operations unbalanced (too many closes)")
}
level--
}
indent := strings.Repeat(" ", level)
fmt.Printf("%3d %s%s %s: %s\n", i, indent, direction, where, message)
if direction == ">" {
level++
}
}
if level != 0 {
log.Panicf("journal operations unbalanced (too many opens)")
}
}
// encodeTagToBytes encodes the given tag to a byte stream. If
// `nextIfdOffsetToWrite` is more than (0), recurse into child IFDs
// (`nextIfdOffsetToWrite` is required in order for them to know where the its
// IFD data will be written, in order for them to know the offset of where
// their allocated-data block will start, which follows right behind).
func (ibe *IfdByteEncoder) encodeTagToBytes(ib *IfdBuilder, bt *BuilderTag, bw *ByteWriter, ida *ifdDataAllocator, nextIfdOffsetToWrite uint32) (childIfdBlock []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// Write tag-ID.
err = bw.WriteUint16(bt.tagId)
log.PanicIf(err)
// Works for both values and child IFDs (which have an official size of
// LONG).
err = bw.WriteUint16(uint16(bt.typeId))
log.PanicIf(err)
// Write unit-count.
if bt.value.IsBytes() == true {
effectiveType := bt.typeId
if bt.typeId == TypeUndefined {
effectiveType = TypeByte
}
// It's a non-unknown value.Calculate the count of values of
// the type that we're writing and the raw bytes for the whole list.
typeSize := uint32(effectiveType.Size())
valueBytes := bt.value.Bytes()
len_ := len(valueBytes)
unitCount := uint32(len_) / typeSize
if _, found := tagsWithoutAlignment[bt.tagId]; found == false {
remainder := uint32(len_) % typeSize
if remainder > 0 {
log.Panicf("tag (0x%04x) value of (%d) bytes not evenly divisible by type-size (%d)", bt.tagId, len_, typeSize)
}
}
err = bw.WriteUint32(unitCount)
log.PanicIf(err)
// Write four-byte value/offset.
if len_ > 4 {
offset, err := ida.Allocate(valueBytes)
log.PanicIf(err)
err = bw.WriteUint32(offset)
log.PanicIf(err)
} else {
fourBytes := make([]byte, 4)
copy(fourBytes, valueBytes)
err = bw.WriteFourBytes(fourBytes)
log.PanicIf(err)
}
} else {
if bt.value.IsIb() == false {
log.Panicf("tag value is not a byte-slice but also not a child IB: %v", bt)
}
// Write unit-count (one LONG representing one offset).
err = bw.WriteUint32(1)
log.PanicIf(err)
if nextIfdOffsetToWrite > 0 {
var err error
ibe.pushToJournal("encodeTagToBytes", ">", "[%s]->[%s]", ib.ifdPath, bt.value.Ib().ifdPath)
// Create the block of IFD data and everything it requires.
childIfdBlock, err = ibe.encodeAndAttachIfd(bt.value.Ib(), nextIfdOffsetToWrite)
log.PanicIf(err)
ibe.pushToJournal("encodeTagToBytes", "<", "[%s]->[%s]", bt.value.Ib().ifdPath, ib.ifdPath)
// Use the next-IFD offset for it. The IFD will actually get
// attached after we return.
err = bw.WriteUint32(nextIfdOffsetToWrite)
log.PanicIf(err)
} else {
// No child-IFDs are to be allocated. Finish the entry with a NULL
// pointer.
ibe.pushToJournal("encodeTagToBytes", "-", "*Not* descending to child: [%s]", bt.value.Ib().ifdPath)
err = bw.WriteUint32(0)
log.PanicIf(err)
}
}
return childIfdBlock, nil
}
// encodeIfdToBytes encodes the given IB to a byte-slice. We are given the
// offset at which this IFD will be written. This method is used called both to
// pre-determine how big the table is going to be (so that we can calculate the
// address to allocate data at) as well as to write the final table.
//
// It is necessary to fully realize the table in order to predetermine its size
// because it is not enough to know the size of the table: If there are child
// IFDs, we will not be able to allocate them without first knowing how much
// data we need to allocate for the current IFD.
func (ibe *IfdByteEncoder) encodeIfdToBytes(ib *IfdBuilder, ifdAddressableOffset uint32, nextIfdOffsetToWrite uint32, setNextIb bool) (data []byte, tableSize uint32, dataSize uint32, childIfdSizes []uint32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ibe.pushToJournal("encodeIfdToBytes", ">", "%s", ib)
tableSize = ibe.TableSize(len(ib.tags))
b := new(bytes.Buffer)
bw := NewByteWriter(b, ib.byteOrder)
// Write tag count.
err = bw.WriteUint16(uint16(len(ib.tags)))
log.PanicIf(err)
ida := newIfdDataAllocator(ifdAddressableOffset)
childIfdBlocks := make([][]byte, 0)
// Write raw bytes for each tag entry. Allocate larger data to be referred
// to in the follow-up data-block as required. Any "unknown"-byte tags that
// we can't parse will not be present here (using AddTagsFromExisting(), at
// least).
for _, bt := range ib.tags {
childIfdBlock, err := ibe.encodeTagToBytes(ib, bt, bw, ida, nextIfdOffsetToWrite)
log.PanicIf(err)
if childIfdBlock != nil {
// We aren't allowed to have non-nil child IFDs if we're just
// sizing things up.
if nextIfdOffsetToWrite == 0 {
log.Panicf("no IFD offset provided for child-IFDs; no new child-IFDs permitted")
}
nextIfdOffsetToWrite += uint32(len(childIfdBlock))
childIfdBlocks = append(childIfdBlocks, childIfdBlock)
}
}
dataBytes := ida.Bytes()
dataSize = uint32(len(dataBytes))
childIfdSizes = make([]uint32, len(childIfdBlocks))
childIfdsTotalSize := uint32(0)
for i, childIfdBlock := range childIfdBlocks {
len_ := uint32(len(childIfdBlock))
childIfdSizes[i] = len_
childIfdsTotalSize += len_
}
// N the link from this IFD to the next IFD that will be written in the
// next cycle.
if setNextIb == true {
// Write address of next IFD in chain. This will be the original
// allocation offset plus the size of everything we have allocated for
// this IFD and its child-IFDs.
//
// It is critical that this number is stepped properly. We experienced
// an issue whereby it first looked like we were duplicating the IFD and
// then that we were duplicating the tags in the wrong IFD, and then
// finally we determined that the next-IFD offset for the first IFD was
// accidentally pointing back to the EXIF IFD, so we were visiting it
// twice when visiting through the tags after decoding. It was an
// expensive bug to find.
ibe.pushToJournal("encodeIfdToBytes", "-", "Setting 'next' IFD to (0x%08x).", nextIfdOffsetToWrite)
err := bw.WriteUint32(nextIfdOffsetToWrite)
log.PanicIf(err)
} else {
err := bw.WriteUint32(0)
log.PanicIf(err)
}
_, err = b.Write(dataBytes)
log.PanicIf(err)
// Append any child IFD blocks after our table and data blocks. These IFDs
// were equipped with the appropriate offset information so it's expected
// that all offsets referred to by these will be correct.
//
// Note that child-IFDs are append after the current IFD and before the
// next IFD, as opposed to the root IFDs, which are chained together but
// will be interrupted by these child-IFDs (which is expected, per the
// standard).
for _, childIfdBlock := range childIfdBlocks {
_, err = b.Write(childIfdBlock)
log.PanicIf(err)
}
ibe.pushToJournal("encodeIfdToBytes", "<", "%s", ib)
return b.Bytes(), tableSize, dataSize, childIfdSizes, nil
}
// encodeAndAttachIfd is a reentrant function that processes the IFD chain.
func (ibe *IfdByteEncoder) encodeAndAttachIfd(ib *IfdBuilder, ifdAddressableOffset uint32) (data []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ibe.pushToJournal("encodeAndAttachIfd", ">", "%s", ib)
b := new(bytes.Buffer)
i := 0
for thisIb := ib; thisIb != nil; thisIb = thisIb.nextIb {
// Do a dry-run in order to pre-determine its size requirement.
ibe.pushToJournal("encodeAndAttachIfd", ">", "Beginning encoding process: (%d) [%s]", i, thisIb.ifdPath)
ibe.pushToJournal("encodeAndAttachIfd", ">", "Calculating size: (%d) [%s]", i, thisIb.ifdPath)
_, tableSize, allocatedDataSize, _, err := ibe.encodeIfdToBytes(thisIb, ifdAddressableOffset, 0, false)
log.PanicIf(err)
ibe.pushToJournal("encodeAndAttachIfd", "<", "Finished calculating size: (%d) [%s]", i, thisIb.ifdPath)
ifdAddressableOffset += tableSize
nextIfdOffsetToWrite := ifdAddressableOffset + allocatedDataSize
ibe.pushToJournal("encodeAndAttachIfd", ">", "Next IFD will be written at offset (0x%08x)", nextIfdOffsetToWrite)
// Write our IFD as well as any child-IFDs (now that we know the offset
// where new IFDs and their data will be allocated).
setNextIb := thisIb.nextIb != nil
ibe.pushToJournal("encodeAndAttachIfd", ">", "Encoding starting: (%d) [%s] NEXT-IFD-OFFSET-TO-WRITE=(0x%08x)", i, thisIb.ifdPath, nextIfdOffsetToWrite)
tableAndAllocated, effectiveTableSize, effectiveAllocatedDataSize, childIfdSizes, err :=
ibe.encodeIfdToBytes(thisIb, ifdAddressableOffset, nextIfdOffsetToWrite, setNextIb)
log.PanicIf(err)
if effectiveTableSize != tableSize {
log.Panicf("written table size does not match the pre-calculated table size: (%d) != (%d) %s", effectiveTableSize, tableSize, ib)
} else if effectiveAllocatedDataSize != allocatedDataSize {
log.Panicf("written allocated-data size does not match the pre-calculated allocated-data size: (%d) != (%d) %s", effectiveAllocatedDataSize, allocatedDataSize, ib)
}
ibe.pushToJournal("encodeAndAttachIfd", "<", "Encoding done: (%d) [%s]", i, thisIb.ifdPath)
totalChildIfdSize := uint32(0)
for _, childIfdSize := range childIfdSizes {
totalChildIfdSize += childIfdSize
}
if len(tableAndAllocated) != int(tableSize+allocatedDataSize+totalChildIfdSize) {
log.Panicf("IFD table and data is not a consistent size: (%d) != (%d)", len(tableAndAllocated), tableSize+allocatedDataSize+totalChildIfdSize)
}
// TODO(dustin): We might want to verify the original tableAndAllocated length, too.
_, err = b.Write(tableAndAllocated)
log.PanicIf(err)
// Advance past what we've allocated, thus far.
ifdAddressableOffset += allocatedDataSize + totalChildIfdSize
ibe.pushToJournal("encodeAndAttachIfd", "<", "Finishing encoding process: (%d) [%s] [FINAL:] NEXT-IFD-OFFSET-TO-WRITE=(0x%08x)", i, ib.ifdPath, nextIfdOffsetToWrite)
i++
}
ibe.pushToJournal("encodeAndAttachIfd", "<", "%s", ib)
return b.Bytes(), nil
}
// EncodeToExifPayload is the base encoding step that transcribes the entire IB
// structure to its on-disk layout.
func (ibe *IfdByteEncoder) EncodeToExifPayload(ib *IfdBuilder) (data []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
data, err = ibe.encodeAndAttachIfd(ib, ExifDefaultFirstIfdOffset)
log.PanicIf(err)
return data, nil
}
// EncodeToExif calls EncodeToExifPayload and then packages the result into a
// complete EXIF block.
func (ibe *IfdByteEncoder) EncodeToExif(ib *IfdBuilder) (data []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
encodedIfds, err := ibe.EncodeToExifPayload(ib)
log.PanicIf(err)
// Wrap the IFD in a formal EXIF block.
b := new(bytes.Buffer)
headerBytes, err := BuildExifHeader(ib.byteOrder, ExifDefaultFirstIfdOffset)
log.PanicIf(err)
_, err = b.Write(headerBytes)
log.PanicIf(err)
_, err = b.Write(encodedIfds)
log.PanicIf(err)
return b.Bytes(), nil
}

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vendor/github.com/dsoprea/go-exif/ifd_enumerate.go generated vendored Normal file
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233
vendor/github.com/dsoprea/go-exif/ifd_tag_entry.go generated vendored Normal file
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package exif
import (
"fmt"
"reflect"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
var (
iteLogger = log.NewLogger("exif.ifd_tag_entry")
)
type IfdTagEntry struct {
TagId uint16
TagIndex int
TagType TagTypePrimitive
UnitCount uint32
ValueOffset uint32
RawValueOffset []byte
// ChildIfdName is the right most atom in the IFD-path. We need this to
// construct the fully-qualified IFD-path.
ChildIfdName string
// ChildIfdPath is the IFD-path of the child if this tag represents a child
// IFD.
ChildIfdPath string
// ChildFqIfdPath is the IFD-path of the child if this tag represents a
// child IFD. Includes indices.
ChildFqIfdPath string
// TODO(dustin): !! IB's host the child-IBs directly in the tag, but that's not the case here. Refactor to accomodate it for a consistent experience.
// IfdPath is the IFD that this tag belongs to.
IfdPath string
// TODO(dustin): !! We now parse and read the value immediately. Update the rest of the logic to use this and get rid of all of the staggered and different resolution mechanisms.
value []byte
isUnhandledUnknown bool
}
func (ite *IfdTagEntry) String() string {
return fmt.Sprintf("IfdTagEntry<TAG-IFD-PATH=[%s] TAG-ID=(0x%04x) TAG-TYPE=[%s] UNIT-COUNT=(%d)>", ite.IfdPath, ite.TagId, TypeNames[ite.TagType], ite.UnitCount)
}
// TODO(dustin): TODO(dustin): Stop exporting IfdPath and TagId.
//
// func (ite *IfdTagEntry) IfdPath() string {
// return ite.IfdPath
// }
// TODO(dustin): TODO(dustin): Stop exporting IfdPath and TagId.
//
// func (ite *IfdTagEntry) TagId() uint16 {
// return ite.TagId
// }
// ValueString renders a string from whatever the value in this tag is.
func (ite *IfdTagEntry) ValueString(addressableData []byte, byteOrder binary.ByteOrder) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
valueContext :=
newValueContextFromTag(
ite,
addressableData,
byteOrder)
if ite.TagType == TypeUndefined {
valueRaw, err := valueContext.Undefined()
log.PanicIf(err)
value = fmt.Sprintf("%v", valueRaw)
} else {
value, err = valueContext.Format()
log.PanicIf(err)
}
return value, nil
}
// ValueBytes renders a specific list of bytes from the value in this tag.
func (ite *IfdTagEntry) ValueBytes(addressableData []byte, byteOrder binary.ByteOrder) (value []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// Return the exact bytes of the unknown-type value. Returning a string
// (`ValueString`) is easy because we can just pass everything to
// `Sprintf()`. Returning the raw, typed value (`Value`) is easy
// (obviously). However, here, in order to produce the list of bytes, we
// need to coerce whatever `Undefined()` returns.
if ite.TagType == TypeUndefined {
valueContext :=
newValueContextFromTag(
ite,
addressableData,
byteOrder)
value, err := valueContext.Undefined()
log.PanicIf(err)
switch value.(type) {
case []byte:
return value.([]byte), nil
case TagUnknownType_UnknownValue:
b := []byte(value.(TagUnknownType_UnknownValue))
return b, nil
case string:
return []byte(value.(string)), nil
case UnknownTagValue:
valueBytes, err := value.(UnknownTagValue).ValueBytes()
log.PanicIf(err)
return valueBytes, nil
default:
// TODO(dustin): !! Finish translating the rest of the types (make reusable and replace into other similar implementations?)
log.Panicf("can not produce bytes for unknown-type tag (0x%04x) (2): [%s]", ite.TagId, reflect.TypeOf(value))
}
}
originalType := NewTagType(ite.TagType, byteOrder)
byteCount := uint32(originalType.Type().Size()) * ite.UnitCount
tt := NewTagType(TypeByte, byteOrder)
if tt.valueIsEmbedded(byteCount) == true {
iteLogger.Debugf(nil, "Reading BYTE value (ITE; embedded).")
// In this case, the bytes normally used for the offset are actually
// data.
value, err = tt.ParseBytes(ite.RawValueOffset, byteCount)
log.PanicIf(err)
} else {
iteLogger.Debugf(nil, "Reading BYTE value (ITE; at offset).")
value, err = tt.ParseBytes(addressableData[ite.ValueOffset:], byteCount)
log.PanicIf(err)
}
return value, nil
}
// Value returns the specific, parsed, typed value from the tag.
func (ite *IfdTagEntry) Value(addressableData []byte, byteOrder binary.ByteOrder) (value interface{}, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
valueContext :=
newValueContextFromTag(
ite,
addressableData,
byteOrder)
if ite.TagType == TypeUndefined {
value, err = valueContext.Undefined()
log.PanicIf(err)
} else {
tt := NewTagType(ite.TagType, byteOrder)
value, err = tt.Resolve(valueContext)
log.PanicIf(err)
}
return value, nil
}
// IfdTagEntryValueResolver instances know how to resolve the values for any
// tag for a particular EXIF block.
type IfdTagEntryValueResolver struct {
addressableData []byte
byteOrder binary.ByteOrder
}
func NewIfdTagEntryValueResolver(exifData []byte, byteOrder binary.ByteOrder) (itevr *IfdTagEntryValueResolver) {
return &IfdTagEntryValueResolver{
addressableData: exifData[ExifAddressableAreaStart:],
byteOrder: byteOrder,
}
}
// ValueBytes will resolve embedded or allocated data from the tag and return the raw bytes.
func (itevr *IfdTagEntryValueResolver) ValueBytes(ite *IfdTagEntry) (value []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// OBSOLETE(dustin): This is now redundant. Use `(*ValueContext).readRawEncoded()` instead of this method.
valueContext := newValueContextFromTag(
ite,
itevr.addressableData,
itevr.byteOrder)
rawBytes, err := valueContext.readRawEncoded()
log.PanicIf(err)
return rawBytes, nil
}
func (itevr *IfdTagEntryValueResolver) Value(ite *IfdTagEntry) (value interface{}, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// OBSOLETE(dustin): This is now redundant. Use `(*ValueContext).Values()` instead of this method.
valueContext := newValueContextFromTag(
ite,
itevr.addressableData,
itevr.byteOrder)
values, err := valueContext.Values()
log.PanicIf(err)
return values, nil
}

4
vendor/github.com/dsoprea/go-exif/package.go generated vendored Normal file
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@ -0,0 +1,4 @@
// exif parses raw EXIF information given a block of raw EXIF data.
//
// v1 of go-exif is now deprecated. Please use v2.
package exif

190
vendor/github.com/dsoprea/go-exif/parser.go generated vendored Normal file
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@ -0,0 +1,190 @@
package exif
import (
"bytes"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
type Parser struct {
}
func (p *Parser) ParseBytes(data []byte, unitCount uint32) (value []uint8, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
count := int(unitCount)
if len(data) < (TypeByte.Size() * count) {
log.Panic(ErrNotEnoughData)
}
value = []uint8(data[:count])
return value, nil
}
// ParseAscii returns a string and auto-strips the trailing NUL character.
func (p *Parser) ParseAscii(data []byte, unitCount uint32) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
count := int(unitCount)
if len(data) < (TypeAscii.Size() * count) {
log.Panic(ErrNotEnoughData)
}
if len(data) == 0 || data[count-1] != 0 {
s := string(data[:count])
typeLogger.Warningf(nil, "ascii not terminated with nul as expected: [%v]", s)
return s, nil
} else {
// Auto-strip the NUL from the end. It serves no purpose outside of
// encoding semantics.
return string(data[:count-1]), nil
}
}
// ParseAsciiNoNul returns a string without any consideration for a trailing NUL
// character.
func (p *Parser) ParseAsciiNoNul(data []byte, unitCount uint32) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
count := int(unitCount)
if len(data) < (TypeAscii.Size() * count) {
log.Panic(ErrNotEnoughData)
}
return string(data[:count]), nil
}
func (p *Parser) ParseShorts(data []byte, unitCount uint32, byteOrder binary.ByteOrder) (value []uint16, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
count := int(unitCount)
if len(data) < (TypeShort.Size() * count) {
log.Panic(ErrNotEnoughData)
}
value = make([]uint16, count)
for i := 0; i < count; i++ {
value[i] = byteOrder.Uint16(data[i*2:])
}
return value, nil
}
func (p *Parser) ParseLongs(data []byte, unitCount uint32, byteOrder binary.ByteOrder) (value []uint32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
count := int(unitCount)
if len(data) < (TypeLong.Size() * count) {
log.Panic(ErrNotEnoughData)
}
value = make([]uint32, count)
for i := 0; i < count; i++ {
value[i] = byteOrder.Uint32(data[i*4:])
}
return value, nil
}
func (p *Parser) ParseRationals(data []byte, unitCount uint32, byteOrder binary.ByteOrder) (value []Rational, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
count := int(unitCount)
if len(data) < (TypeRational.Size() * count) {
log.Panic(ErrNotEnoughData)
}
value = make([]Rational, count)
for i := 0; i < count; i++ {
value[i].Numerator = byteOrder.Uint32(data[i*8:])
value[i].Denominator = byteOrder.Uint32(data[i*8+4:])
}
return value, nil
}
func (p *Parser) ParseSignedLongs(data []byte, unitCount uint32, byteOrder binary.ByteOrder) (value []int32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
count := int(unitCount)
if len(data) < (TypeSignedLong.Size() * count) {
log.Panic(ErrNotEnoughData)
}
b := bytes.NewBuffer(data)
value = make([]int32, count)
for i := 0; i < count; i++ {
err := binary.Read(b, byteOrder, &value[i])
log.PanicIf(err)
}
return value, nil
}
func (p *Parser) ParseSignedRationals(data []byte, unitCount uint32, byteOrder binary.ByteOrder) (value []SignedRational, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
count := int(unitCount)
if len(data) < (TypeSignedRational.Size() * count) {
log.Panic(ErrNotEnoughData)
}
b := bytes.NewBuffer(data)
value = make([]SignedRational, count)
for i := 0; i < count; i++ {
err = binary.Read(b, byteOrder, &value[i].Numerator)
log.PanicIf(err)
err = binary.Read(b, byteOrder, &value[i].Denominator)
log.PanicIf(err)
}
return value, nil
}

397
vendor/github.com/dsoprea/go-exif/tag_type.go generated vendored Normal file
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package exif
// NOTE(dustin): Most of this file encapsulates deprecated functionality and awaits being dumped in a future release.
import (
"fmt"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
type TagType struct {
tagType TagTypePrimitive
name string
byteOrder binary.ByteOrder
}
func NewTagType(tagType TagTypePrimitive, byteOrder binary.ByteOrder) TagType {
name, found := TypeNames[tagType]
if found == false {
log.Panicf("tag-type not valid: 0x%04x", tagType)
}
return TagType{
tagType: tagType,
name: name,
byteOrder: byteOrder,
}
}
func (tt TagType) String() string {
return fmt.Sprintf("TagType<NAME=[%s]>", tt.name)
}
func (tt TagType) Name() string {
return tt.name
}
func (tt TagType) Type() TagTypePrimitive {
return tt.tagType
}
func (tt TagType) ByteOrder() binary.ByteOrder {
return tt.byteOrder
}
func (tt TagType) Size() int {
// DEPRECATED(dustin): `(TagTypePrimitive).Size()` should be used, directly.
return tt.Type().Size()
}
// valueIsEmbedded will return a boolean indicating whether the value should be
// found directly within the IFD entry or an offset to somewhere else.
func (tt TagType) valueIsEmbedded(unitCount uint32) bool {
return (tt.tagType.Size() * int(unitCount)) <= 4
}
func (tt TagType) readRawEncoded(valueContext ValueContext) (rawBytes []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
unitSizeRaw := uint32(tt.tagType.Size())
if tt.valueIsEmbedded(valueContext.UnitCount()) == true {
byteLength := unitSizeRaw * valueContext.UnitCount()
return valueContext.RawValueOffset()[:byteLength], nil
} else {
return valueContext.AddressableData()[valueContext.ValueOffset() : valueContext.ValueOffset()+valueContext.UnitCount()*unitSizeRaw], nil
}
}
func (tt TagType) ParseBytes(data []byte, unitCount uint32) (value []uint8, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(*Parser).ParseBytes()` should be used.
value, err = parser.ParseBytes(data, unitCount)
log.PanicIf(err)
return value, nil
}
// ParseAscii returns a string and auto-strips the trailing NUL character.
func (tt TagType) ParseAscii(data []byte, unitCount uint32) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(*Parser).ParseAscii()` should be used.
value, err = parser.ParseAscii(data, unitCount)
log.PanicIf(err)
return value, nil
}
// ParseAsciiNoNul returns a string without any consideration for a trailing NUL
// character.
func (tt TagType) ParseAsciiNoNul(data []byte, unitCount uint32) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(*Parser).ParseAsciiNoNul()` should be used.
value, err = parser.ParseAsciiNoNul(data, unitCount)
log.PanicIf(err)
return value, nil
}
func (tt TagType) ParseShorts(data []byte, unitCount uint32) (value []uint16, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(*Parser).ParseShorts()` should be used.
value, err = parser.ParseShorts(data, unitCount, tt.byteOrder)
log.PanicIf(err)
return value, nil
}
func (tt TagType) ParseLongs(data []byte, unitCount uint32) (value []uint32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(*Parser).ParseLongs()` should be used.
value, err = parser.ParseLongs(data, unitCount, tt.byteOrder)
log.PanicIf(err)
return value, nil
}
func (tt TagType) ParseRationals(data []byte, unitCount uint32) (value []Rational, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(*Parser).ParseRationals()` should be used.
value, err = parser.ParseRationals(data, unitCount, tt.byteOrder)
log.PanicIf(err)
return value, nil
}
func (tt TagType) ParseSignedLongs(data []byte, unitCount uint32) (value []int32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(*Parser).ParseSignedLongs()` should be used.
value, err = parser.ParseSignedLongs(data, unitCount, tt.byteOrder)
log.PanicIf(err)
return value, nil
}
func (tt TagType) ParseSignedRationals(data []byte, unitCount uint32) (value []SignedRational, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(*Parser).ParseSignedRationals()` should be used.
value, err = parser.ParseSignedRationals(data, unitCount, tt.byteOrder)
log.PanicIf(err)
return value, nil
}
func (tt TagType) ReadByteValues(valueContext ValueContext) (value []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(ValueContext).ReadBytes()` should be used.
value, err = valueContext.ReadBytes()
log.PanicIf(err)
return value, nil
}
func (tt TagType) ReadAsciiValue(valueContext ValueContext) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(ValueContext).ReadAscii()` should be used.
value, err = valueContext.ReadAscii()
log.PanicIf(err)
return value, nil
}
func (tt TagType) ReadAsciiNoNulValue(valueContext ValueContext) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(ValueContext).ReadAsciiNoNul()` should be used.
value, err = valueContext.ReadAsciiNoNul()
log.PanicIf(err)
return value, nil
}
func (tt TagType) ReadShortValues(valueContext ValueContext) (value []uint16, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(ValueContext).ReadShorts()` should be used.
value, err = valueContext.ReadShorts()
log.PanicIf(err)
return value, nil
}
func (tt TagType) ReadLongValues(valueContext ValueContext) (value []uint32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(ValueContext).ReadLongs()` should be used.
value, err = valueContext.ReadLongs()
log.PanicIf(err)
return value, nil
}
func (tt TagType) ReadRationalValues(valueContext ValueContext) (value []Rational, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(ValueContext).ReadRationals()` should be used.
value, err = valueContext.ReadRationals()
log.PanicIf(err)
return value, nil
}
func (tt TagType) ReadSignedLongValues(valueContext ValueContext) (value []int32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(ValueContext).ReadSignedLongs()` should be used.
value, err = valueContext.ReadSignedLongs()
log.PanicIf(err)
return value, nil
}
func (tt TagType) ReadSignedRationalValues(valueContext ValueContext) (value []SignedRational, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(ValueContext).ReadSignedRationals()` should be used.
value, err = valueContext.ReadSignedRationals()
log.PanicIf(err)
return value, nil
}
// ResolveAsString resolves the given value and returns a flat string.
//
// Where the type is not ASCII, `justFirst` indicates whether to just stringify
// the first item in the slice (or return an empty string if the slice is
// empty).
//
// Since this method lacks the information to process unknown-type tags (e.g.
// byte-order, tag-ID, IFD type), it will return an error if attempted. See
// `Undefined()`.
func (tt TagType) ResolveAsString(valueContext ValueContext, justFirst bool) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
if justFirst == true {
value, err = valueContext.FormatFirst()
log.PanicIf(err)
} else {
value, err = valueContext.Format()
log.PanicIf(err)
}
return value, nil
}
// Resolve knows how to resolve the given value.
//
// Since this method lacks the information to process unknown-type tags (e.g.
// byte-order, tag-ID, IFD type), it will return an error if attempted. See
// `Undefined()`.
func (tt TagType) Resolve(valueContext *ValueContext) (values interface{}, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `(ValueContext).Values()` should be used.
values, err = valueContext.Values()
log.PanicIf(err)
return values, nil
}
// Encode knows how to encode the given value to a byte slice.
func (tt TagType) Encode(value interface{}) (encoded []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ve := NewValueEncoder(tt.byteOrder)
ed, err := ve.EncodeWithType(tt, value)
log.PanicIf(err)
return ed.Encoded, err
}
func (tt TagType) FromString(valueString string) (value interface{}, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// DEPRECATED(dustin): `EncodeStringToBytes()` should be used.
value, err = EncodeStringToBytes(tt.tagType, valueString)
log.PanicIf(err)
return value, nil
}

229
vendor/github.com/dsoprea/go-exif/tags.go generated vendored Normal file
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package exif
import (
"fmt"
"github.com/dsoprea/go-logging"
"gopkg.in/yaml.v2"
)
const (
// IFD1
ThumbnailOffsetTagId = 0x0201
ThumbnailSizeTagId = 0x0202
// Exif
TagVersionId = 0x0000
TagLatitudeId = 0x0002
TagLatitudeRefId = 0x0001
TagLongitudeId = 0x0004
TagLongitudeRefId = 0x0003
TagTimestampId = 0x0007
TagDatestampId = 0x001d
TagAltitudeId = 0x0006
TagAltitudeRefId = 0x0005
)
var (
// tagsWithoutAlignment is a tag-lookup for tags whose value size won't
// necessarily be a multiple of its tag-type.
tagsWithoutAlignment = map[uint16]struct{}{
// The thumbnail offset is stored as a long, but its data is a binary
// blob (not a slice of longs).
ThumbnailOffsetTagId: {},
}
)
var (
tagsLogger = log.NewLogger("exif.tags")
)
// File structures.
type encodedTag struct {
// id is signed, here, because YAML doesn't have enough information to
// support unsigned.
Id int `yaml:"id"`
Name string `yaml:"name"`
TypeName string `yaml:"type_name"`
}
// Indexing structures.
type IndexedTag struct {
Id uint16
Name string
IfdPath string
Type TagTypePrimitive
}
func (it *IndexedTag) String() string {
return fmt.Sprintf("TAG<ID=(0x%04x) NAME=[%s] IFD=[%s]>", it.Id, it.Name, it.IfdPath)
}
func (it *IndexedTag) IsName(ifdPath, name string) bool {
return it.Name == name && it.IfdPath == ifdPath
}
func (it *IndexedTag) Is(ifdPath string, id uint16) bool {
return it.Id == id && it.IfdPath == ifdPath
}
type TagIndex struct {
tagsByIfd map[string]map[uint16]*IndexedTag
tagsByIfdR map[string]map[string]*IndexedTag
}
func NewTagIndex() *TagIndex {
ti := new(TagIndex)
ti.tagsByIfd = make(map[string]map[uint16]*IndexedTag)
ti.tagsByIfdR = make(map[string]map[string]*IndexedTag)
return ti
}
func (ti *TagIndex) Add(it *IndexedTag) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// Store by ID.
family, found := ti.tagsByIfd[it.IfdPath]
if found == false {
family = make(map[uint16]*IndexedTag)
ti.tagsByIfd[it.IfdPath] = family
}
if _, found := family[it.Id]; found == true {
log.Panicf("tag-ID defined more than once for IFD [%s]: (%02x)", it.IfdPath, it.Id)
}
family[it.Id] = it
// Store by name.
familyR, found := ti.tagsByIfdR[it.IfdPath]
if found == false {
familyR = make(map[string]*IndexedTag)
ti.tagsByIfdR[it.IfdPath] = familyR
}
if _, found := familyR[it.Name]; found == true {
log.Panicf("tag-name defined more than once for IFD [%s]: (%s)", it.IfdPath, it.Name)
}
familyR[it.Name] = it
return nil
}
// Get returns information about the non-IFD tag.
func (ti *TagIndex) Get(ifdPath string, id uint16) (it *IndexedTag, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
if len(ti.tagsByIfd) == 0 {
err := LoadStandardTags(ti)
log.PanicIf(err)
}
family, found := ti.tagsByIfd[ifdPath]
if found == false {
log.Panic(ErrTagNotFound)
}
it, found = family[id]
if found == false {
log.Panic(ErrTagNotFound)
}
return it, nil
}
// Get returns information about the non-IFD tag.
func (ti *TagIndex) GetWithName(ifdPath string, name string) (it *IndexedTag, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
if len(ti.tagsByIfdR) == 0 {
err := LoadStandardTags(ti)
log.PanicIf(err)
}
it, found := ti.tagsByIfdR[ifdPath][name]
if found != true {
log.Panic(ErrTagNotFound)
}
return it, nil
}
// LoadStandardTags registers the tags that all devices/applications should
// support.
func LoadStandardTags(ti *TagIndex) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// Read static data.
encodedIfds := make(map[string][]encodedTag)
err = yaml.Unmarshal([]byte(tagsYaml), encodedIfds)
log.PanicIf(err)
// Load structure.
count := 0
for ifdPath, tags := range encodedIfds {
for _, tagInfo := range tags {
tagId := uint16(tagInfo.Id)
tagName := tagInfo.Name
tagTypeName := tagInfo.TypeName
// TODO(dustin): !! Non-standard types, but found in real data. Ignore for right now.
if tagTypeName == "SSHORT" || tagTypeName == "FLOAT" || tagTypeName == "DOUBLE" {
continue
}
tagTypeId, found := TypeNamesR[tagTypeName]
if found == false {
log.Panicf("type [%s] for [%s] not valid", tagTypeName, tagName)
continue
}
it := &IndexedTag{
IfdPath: ifdPath,
Id: tagId,
Name: tagName,
Type: tagTypeId,
}
err = ti.Add(it)
log.PanicIf(err)
count++
}
}
tagsLogger.Debugf(nil, "(%d) tags loaded.", count)
return nil
}

951
vendor/github.com/dsoprea/go-exif/tags_data.go generated vendored Normal file
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@ -0,0 +1,951 @@
package exif
var (
// From assets/tags.yaml . Needs to be here so it's embedded in the binary.
tagsYaml = `
# Notes:
#
# This file was produced from http://www.exiv2.org/tags.html, using the included
# tool, though that document appears to have some duplicates when all IDs are
# supposed to be unique (EXIF information only has IDs, not IFDs; IFDs are
# determined by our pre-existing knowledge of those tags).
#
# The webpage that we've produced this file from appears to indicate that
# ImageWidth is represented by both 0x0100 and 0x0001 depending on whether the
# encoding is RGB or YCbCr.
IFD/Exif:
- id: 0x829a
name: ExposureTime
type_name: RATIONAL
- id: 0x829d
name: FNumber
type_name: RATIONAL
- id: 0x8822
name: ExposureProgram
type_name: SHORT
- id: 0x8824
name: SpectralSensitivity
type_name: ASCII
- id: 0x8827
name: ISOSpeedRatings
type_name: SHORT
- id: 0x8828
name: OECF
type_name: UNDEFINED
- id: 0x8830
name: SensitivityType
type_name: SHORT
- id: 0x8831
name: StandardOutputSensitivity
type_name: LONG
- id: 0x8832
name: RecommendedExposureIndex
type_name: LONG
- id: 0x8833
name: ISOSpeed
type_name: LONG
- id: 0x8834
name: ISOSpeedLatitudeyyy
type_name: LONG
- id: 0x8835
name: ISOSpeedLatitudezzz
type_name: LONG
- id: 0x9000
name: ExifVersion
type_name: UNDEFINED
- id: 0x9003
name: DateTimeOriginal
type_name: ASCII
- id: 0x9004
name: DateTimeDigitized
type_name: ASCII
- id: 0x9101
name: ComponentsConfiguration
type_name: UNDEFINED
- id: 0x9102
name: CompressedBitsPerPixel
type_name: RATIONAL
- id: 0x9201
name: ShutterSpeedValue
type_name: SRATIONAL
- id: 0x9202
name: ApertureValue
type_name: RATIONAL
- id: 0x9203
name: BrightnessValue
type_name: SRATIONAL
- id: 0x9204
name: ExposureBiasValue
type_name: SRATIONAL
- id: 0x9205
name: MaxApertureValue
type_name: RATIONAL
- id: 0x9206
name: SubjectDistance
type_name: RATIONAL
- id: 0x9207
name: MeteringMode
type_name: SHORT
- id: 0x9208
name: LightSource
type_name: SHORT
- id: 0x9209
name: Flash
type_name: SHORT
- id: 0x920a
name: FocalLength
type_name: RATIONAL
- id: 0x9214
name: SubjectArea
type_name: SHORT
- id: 0x927c
name: MakerNote
type_name: UNDEFINED
- id: 0x9286
name: UserComment
type_name: UNDEFINED
- id: 0x9290
name: SubSecTime
type_name: ASCII
- id: 0x9291
name: SubSecTimeOriginal
type_name: ASCII
- id: 0x9292
name: SubSecTimeDigitized
type_name: ASCII
- id: 0xa000
name: FlashpixVersion
type_name: UNDEFINED
- id: 0xa001
name: ColorSpace
type_name: SHORT
- id: 0xa002
name: PixelXDimension
type_name: LONG
- id: 0xa003
name: PixelYDimension
type_name: LONG
- id: 0xa004
name: RelatedSoundFile
type_name: ASCII
- id: 0xa005
name: InteroperabilityTag
type_name: LONG
- id: 0xa20b
name: FlashEnergy
type_name: RATIONAL
- id: 0xa20c
name: SpatialFrequencyResponse
type_name: UNDEFINED
- id: 0xa20e
name: FocalPlaneXResolution
type_name: RATIONAL
- id: 0xa20f
name: FocalPlaneYResolution
type_name: RATIONAL
- id: 0xa210
name: FocalPlaneResolutionUnit
type_name: SHORT
- id: 0xa214
name: SubjectLocation
type_name: SHORT
- id: 0xa215
name: ExposureIndex
type_name: RATIONAL
- id: 0xa217
name: SensingMethod
type_name: SHORT
- id: 0xa300
name: FileSource
type_name: UNDEFINED
- id: 0xa301
name: SceneType
type_name: UNDEFINED
- id: 0xa302
name: CFAPattern
type_name: UNDEFINED
- id: 0xa401
name: CustomRendered
type_name: SHORT
- id: 0xa402
name: ExposureMode
type_name: SHORT
- id: 0xa403
name: WhiteBalance
type_name: SHORT
- id: 0xa404
name: DigitalZoomRatio
type_name: RATIONAL
- id: 0xa405
name: FocalLengthIn35mmFilm
type_name: SHORT
- id: 0xa406
name: SceneCaptureType
type_name: SHORT
- id: 0xa407
name: GainControl
type_name: SHORT
- id: 0xa408
name: Contrast
type_name: SHORT
- id: 0xa409
name: Saturation
type_name: SHORT
- id: 0xa40a
name: Sharpness
type_name: SHORT
- id: 0xa40b
name: DeviceSettingDescription
type_name: UNDEFINED
- id: 0xa40c
name: SubjectDistanceRange
type_name: SHORT
- id: 0xa420
name: ImageUniqueID
type_name: ASCII
- id: 0xa430
name: CameraOwnerName
type_name: ASCII
- id: 0xa431
name: BodySerialNumber
type_name: ASCII
- id: 0xa432
name: LensSpecification
type_name: RATIONAL
- id: 0xa433
name: LensMake
type_name: ASCII
- id: 0xa434
name: LensModel
type_name: ASCII
- id: 0xa435
name: LensSerialNumber
type_name: ASCII
IFD/GPSInfo:
- id: 0x0000
name: GPSVersionID
type_name: BYTE
- id: 0x0001
name: GPSLatitudeRef
type_name: ASCII
- id: 0x0002
name: GPSLatitude
type_name: RATIONAL
- id: 0x0003
name: GPSLongitudeRef
type_name: ASCII
- id: 0x0004
name: GPSLongitude
type_name: RATIONAL
- id: 0x0005
name: GPSAltitudeRef
type_name: BYTE
- id: 0x0006
name: GPSAltitude
type_name: RATIONAL
- id: 0x0007
name: GPSTimeStamp
type_name: RATIONAL
- id: 0x0008
name: GPSSatellites
type_name: ASCII
- id: 0x0009
name: GPSStatus
type_name: ASCII
- id: 0x000a
name: GPSMeasureMode
type_name: ASCII
- id: 0x000b
name: GPSDOP
type_name: RATIONAL
- id: 0x000c
name: GPSSpeedRef
type_name: ASCII
- id: 0x000d
name: GPSSpeed
type_name: RATIONAL
- id: 0x000e
name: GPSTrackRef
type_name: ASCII
- id: 0x000f
name: GPSTrack
type_name: RATIONAL
- id: 0x0010
name: GPSImgDirectionRef
type_name: ASCII
- id: 0x0011
name: GPSImgDirection
type_name: RATIONAL
- id: 0x0012
name: GPSMapDatum
type_name: ASCII
- id: 0x0013
name: GPSDestLatitudeRef
type_name: ASCII
- id: 0x0014
name: GPSDestLatitude
type_name: RATIONAL
- id: 0x0015
name: GPSDestLongitudeRef
type_name: ASCII
- id: 0x0016
name: GPSDestLongitude
type_name: RATIONAL
- id: 0x0017
name: GPSDestBearingRef
type_name: ASCII
- id: 0x0018
name: GPSDestBearing
type_name: RATIONAL
- id: 0x0019
name: GPSDestDistanceRef
type_name: ASCII
- id: 0x001a
name: GPSDestDistance
type_name: RATIONAL
- id: 0x001b
name: GPSProcessingMethod
type_name: UNDEFINED
- id: 0x001c
name: GPSAreaInformation
type_name: UNDEFINED
- id: 0x001d
name: GPSDateStamp
type_name: ASCII
- id: 0x001e
name: GPSDifferential
type_name: SHORT
IFD:
- id: 0x000b
name: ProcessingSoftware
type_name: ASCII
- id: 0x00fe
name: NewSubfileType
type_name: LONG
- id: 0x00ff
name: SubfileType
type_name: SHORT
- id: 0x0100
name: ImageWidth
type_name: LONG
- id: 0x0101
name: ImageLength
type_name: LONG
- id: 0x0102
name: BitsPerSample
type_name: SHORT
- id: 0x0103
name: Compression
type_name: SHORT
- id: 0x0106
name: PhotometricInterpretation
type_name: SHORT
- id: 0x0107
name: Thresholding
type_name: SHORT
- id: 0x0108
name: CellWidth
type_name: SHORT
- id: 0x0109
name: CellLength
type_name: SHORT
- id: 0x010a
name: FillOrder
type_name: SHORT
- id: 0x010d
name: DocumentName
type_name: ASCII
- id: 0x010e
name: ImageDescription
type_name: ASCII
- id: 0x010f
name: Make
type_name: ASCII
- id: 0x0110
name: Model
type_name: ASCII
- id: 0x0111
name: StripOffsets
type_name: LONG
- id: 0x0112
name: Orientation
type_name: SHORT
- id: 0x0115
name: SamplesPerPixel
type_name: SHORT
- id: 0x0116
name: RowsPerStrip
type_name: LONG
- id: 0x0117
name: StripByteCounts
type_name: LONG
- id: 0x011a
name: XResolution
type_name: RATIONAL
- id: 0x011b
name: YResolution
type_name: RATIONAL
- id: 0x011c
name: PlanarConfiguration
type_name: SHORT
- id: 0x0122
name: GrayResponseUnit
type_name: SHORT
- id: 0x0123
name: GrayResponseCurve
type_name: SHORT
- id: 0x0124
name: T4Options
type_name: LONG
- id: 0x0125
name: T6Options
type_name: LONG
- id: 0x0128
name: ResolutionUnit
type_name: SHORT
- id: 0x0129
name: PageNumber
type_name: SHORT
- id: 0x012d
name: TransferFunction
type_name: SHORT
- id: 0x0131
name: Software
type_name: ASCII
- id: 0x0132
name: DateTime
type_name: ASCII
- id: 0x013b
name: Artist
type_name: ASCII
- id: 0x013c
name: HostComputer
type_name: ASCII
- id: 0x013d
name: Predictor
type_name: SHORT
- id: 0x013e
name: WhitePoint
type_name: RATIONAL
- id: 0x013f
name: PrimaryChromaticities
type_name: RATIONAL
- id: 0x0140
name: ColorMap
type_name: SHORT
- id: 0x0141
name: HalftoneHints
type_name: SHORT
- id: 0x0142
name: TileWidth
type_name: SHORT
- id: 0x0143
name: TileLength
type_name: SHORT
- id: 0x0144
name: TileOffsets
type_name: SHORT
- id: 0x0145
name: TileByteCounts
type_name: SHORT
- id: 0x014a
name: SubIFDs
type_name: LONG
- id: 0x014c
name: InkSet
type_name: SHORT
- id: 0x014d
name: InkNames
type_name: ASCII
- id: 0x014e
name: NumberOfInks
type_name: SHORT
- id: 0x0150
name: DotRange
type_name: BYTE
- id: 0x0151
name: TargetPrinter
type_name: ASCII
- id: 0x0152
name: ExtraSamples
type_name: SHORT
- id: 0x0153
name: SampleFormat
type_name: SHORT
- id: 0x0154
name: SMinSampleValue
type_name: SHORT
- id: 0x0155
name: SMaxSampleValue
type_name: SHORT
- id: 0x0156
name: TransferRange
type_name: SHORT
- id: 0x0157
name: ClipPath
type_name: BYTE
- id: 0x0158
name: XClipPathUnits
type_name: SSHORT
- id: 0x0159
name: YClipPathUnits
type_name: SSHORT
- id: 0x015a
name: Indexed
type_name: SHORT
- id: 0x015b
name: JPEGTables
type_name: UNDEFINED
- id: 0x015f
name: OPIProxy
type_name: SHORT
- id: 0x0200
name: JPEGProc
type_name: LONG
- id: 0x0201
name: JPEGInterchangeFormat
type_name: LONG
- id: 0x0202
name: JPEGInterchangeFormatLength
type_name: LONG
- id: 0x0203
name: JPEGRestartInterval
type_name: SHORT
- id: 0x0205
name: JPEGLosslessPredictors
type_name: SHORT
- id: 0x0206
name: JPEGPointTransforms
type_name: SHORT
- id: 0x0207
name: JPEGQTables
type_name: LONG
- id: 0x0208
name: JPEGDCTables
type_name: LONG
- id: 0x0209
name: JPEGACTables
type_name: LONG
- id: 0x0211
name: YCbCrCoefficients
type_name: RATIONAL
- id: 0x0212
name: YCbCrSubSampling
type_name: SHORT
- id: 0x0213
name: YCbCrPositioning
type_name: SHORT
- id: 0x0214
name: ReferenceBlackWhite
type_name: RATIONAL
- id: 0x02bc
name: XMLPacket
type_name: BYTE
- id: 0x4746
name: Rating
type_name: SHORT
- id: 0x4749
name: RatingPercent
type_name: SHORT
- id: 0x800d
name: ImageID
type_name: ASCII
- id: 0x828d
name: CFARepeatPatternDim
type_name: SHORT
- id: 0x828e
name: CFAPattern
type_name: BYTE
- id: 0x828f
name: BatteryLevel
type_name: RATIONAL
- id: 0x8298
name: Copyright
type_name: ASCII
- id: 0x829a
name: ExposureTime
type_name: RATIONAL
- id: 0x829d
name: FNumber
type_name: RATIONAL
- id: 0x83bb
name: IPTCNAA
type_name: LONG
- id: 0x8649
name: ImageResources
type_name: BYTE
- id: 0x8769
name: ExifTag
type_name: LONG
- id: 0x8773
name: InterColorProfile
type_name: UNDEFINED
- id: 0x8822
name: ExposureProgram
type_name: SHORT
- id: 0x8824
name: SpectralSensitivity
type_name: ASCII
- id: 0x8825
name: GPSTag
type_name: LONG
- id: 0x8827
name: ISOSpeedRatings
type_name: SHORT
- id: 0x8828
name: OECF
type_name: UNDEFINED
- id: 0x8829
name: Interlace
type_name: SHORT
- id: 0x882a
name: TimeZoneOffset
type_name: SSHORT
- id: 0x882b
name: SelfTimerMode
type_name: SHORT
- id: 0x9003
name: DateTimeOriginal
type_name: ASCII
- id: 0x9102
name: CompressedBitsPerPixel
type_name: RATIONAL
- id: 0x9201
name: ShutterSpeedValue
type_name: SRATIONAL
- id: 0x9202
name: ApertureValue
type_name: RATIONAL
- id: 0x9203
name: BrightnessValue
type_name: SRATIONAL
- id: 0x9204
name: ExposureBiasValue
type_name: SRATIONAL
- id: 0x9205
name: MaxApertureValue
type_name: RATIONAL
- id: 0x9206
name: SubjectDistance
type_name: SRATIONAL
- id: 0x9207
name: MeteringMode
type_name: SHORT
- id: 0x9208
name: LightSource
type_name: SHORT
- id: 0x9209
name: Flash
type_name: SHORT
- id: 0x920a
name: FocalLength
type_name: RATIONAL
- id: 0x920b
name: FlashEnergy
type_name: RATIONAL
- id: 0x920c
name: SpatialFrequencyResponse
type_name: UNDEFINED
- id: 0x920d
name: Noise
type_name: UNDEFINED
- id: 0x920e
name: FocalPlaneXResolution
type_name: RATIONAL
- id: 0x920f
name: FocalPlaneYResolution
type_name: RATIONAL
- id: 0x9210
name: FocalPlaneResolutionUnit
type_name: SHORT
- id: 0x9211
name: ImageNumber
type_name: LONG
- id: 0x9212
name: SecurityClassification
type_name: ASCII
- id: 0x9213
name: ImageHistory
type_name: ASCII
- id: 0x9214
name: SubjectLocation
type_name: SHORT
- id: 0x9215
name: ExposureIndex
type_name: RATIONAL
- id: 0x9216
name: TIFFEPStandardID
type_name: BYTE
- id: 0x9217
name: SensingMethod
type_name: SHORT
- id: 0x9c9b
name: XPTitle
type_name: BYTE
- id: 0x9c9c
name: XPComment
type_name: BYTE
- id: 0x9c9d
name: XPAuthor
type_name: BYTE
- id: 0x9c9e
name: XPKeywords
type_name: BYTE
- id: 0x9c9f
name: XPSubject
type_name: BYTE
- id: 0xc4a5
name: PrintImageMatching
type_name: UNDEFINED
- id: 0xc612
name: DNGVersion
type_name: BYTE
- id: 0xc613
name: DNGBackwardVersion
type_name: BYTE
- id: 0xc614
name: UniqueCameraModel
type_name: ASCII
- id: 0xc615
name: LocalizedCameraModel
type_name: BYTE
- id: 0xc616
name: CFAPlaneColor
type_name: BYTE
- id: 0xc617
name: CFALayout
type_name: SHORT
- id: 0xc618
name: LinearizationTable
type_name: SHORT
- id: 0xc619
name: BlackLevelRepeatDim
type_name: SHORT
- id: 0xc61a
name: BlackLevel
type_name: RATIONAL
- id: 0xc61b
name: BlackLevelDeltaH
type_name: SRATIONAL
- id: 0xc61c
name: BlackLevelDeltaV
type_name: SRATIONAL
- id: 0xc61d
name: WhiteLevel
type_name: SHORT
- id: 0xc61e
name: DefaultScale
type_name: RATIONAL
- id: 0xc61f
name: DefaultCropOrigin
type_name: SHORT
- id: 0xc620
name: DefaultCropSize
type_name: SHORT
- id: 0xc621
name: ColorMatrix1
type_name: SRATIONAL
- id: 0xc622
name: ColorMatrix2
type_name: SRATIONAL
- id: 0xc623
name: CameraCalibration1
type_name: SRATIONAL
- id: 0xc624
name: CameraCalibration2
type_name: SRATIONAL
- id: 0xc625
name: ReductionMatrix1
type_name: SRATIONAL
- id: 0xc626
name: ReductionMatrix2
type_name: SRATIONAL
- id: 0xc627
name: AnalogBalance
type_name: RATIONAL
- id: 0xc628
name: AsShotNeutral
type_name: SHORT
- id: 0xc629
name: AsShotWhiteXY
type_name: RATIONAL
- id: 0xc62a
name: BaselineExposure
type_name: SRATIONAL
- id: 0xc62b
name: BaselineNoise
type_name: RATIONAL
- id: 0xc62c
name: BaselineSharpness
type_name: RATIONAL
- id: 0xc62d
name: BayerGreenSplit
type_name: LONG
- id: 0xc62e
name: LinearResponseLimit
type_name: RATIONAL
- id: 0xc62f
name: CameraSerialNumber
type_name: ASCII
- id: 0xc630
name: LensInfo
type_name: RATIONAL
- id: 0xc631
name: ChromaBlurRadius
type_name: RATIONAL
- id: 0xc632
name: AntiAliasStrength
type_name: RATIONAL
- id: 0xc633
name: ShadowScale
type_name: SRATIONAL
- id: 0xc634
name: DNGPrivateData
type_name: BYTE
- id: 0xc635
name: MakerNoteSafety
type_name: SHORT
- id: 0xc65a
name: CalibrationIlluminant1
type_name: SHORT
- id: 0xc65b
name: CalibrationIlluminant2
type_name: SHORT
- id: 0xc65c
name: BestQualityScale
type_name: RATIONAL
- id: 0xc65d
name: RawDataUniqueID
type_name: BYTE
- id: 0xc68b
name: OriginalRawFileName
type_name: BYTE
- id: 0xc68c
name: OriginalRawFileData
type_name: UNDEFINED
- id: 0xc68d
name: ActiveArea
type_name: SHORT
- id: 0xc68e
name: MaskedAreas
type_name: SHORT
- id: 0xc68f
name: AsShotICCProfile
type_name: UNDEFINED
- id: 0xc690
name: AsShotPreProfileMatrix
type_name: SRATIONAL
- id: 0xc691
name: CurrentICCProfile
type_name: UNDEFINED
- id: 0xc692
name: CurrentPreProfileMatrix
type_name: SRATIONAL
- id: 0xc6bf
name: ColorimetricReference
type_name: SHORT
- id: 0xc6f3
name: CameraCalibrationSignature
type_name: BYTE
- id: 0xc6f4
name: ProfileCalibrationSignature
type_name: BYTE
- id: 0xc6f6
name: AsShotProfileName
type_name: BYTE
- id: 0xc6f7
name: NoiseReductionApplied
type_name: RATIONAL
- id: 0xc6f8
name: ProfileName
type_name: BYTE
- id: 0xc6f9
name: ProfileHueSatMapDims
type_name: LONG
- id: 0xc6fa
name: ProfileHueSatMapData1
type_name: FLOAT
- id: 0xc6fb
name: ProfileHueSatMapData2
type_name: FLOAT
- id: 0xc6fc
name: ProfileToneCurve
type_name: FLOAT
- id: 0xc6fd
name: ProfileEmbedPolicy
type_name: LONG
- id: 0xc6fe
name: ProfileCopyright
type_name: BYTE
- id: 0xc714
name: ForwardMatrix1
type_name: SRATIONAL
- id: 0xc715
name: ForwardMatrix2
type_name: SRATIONAL
- id: 0xc716
name: PreviewApplicationName
type_name: BYTE
- id: 0xc717
name: PreviewApplicationVersion
type_name: BYTE
- id: 0xc718
name: PreviewSettingsName
type_name: BYTE
- id: 0xc719
name: PreviewSettingsDigest
type_name: BYTE
- id: 0xc71a
name: PreviewColorSpace
type_name: LONG
- id: 0xc71b
name: PreviewDateTime
type_name: ASCII
- id: 0xc71c
name: RawImageDigest
type_name: UNDEFINED
- id: 0xc71d
name: OriginalRawFileDigest
type_name: UNDEFINED
- id: 0xc71e
name: SubTileBlockSize
type_name: LONG
- id: 0xc71f
name: RowInterleaveFactor
type_name: LONG
- id: 0xc725
name: ProfileLookTableDims
type_name: LONG
- id: 0xc726
name: ProfileLookTableData
type_name: FLOAT
- id: 0xc740
name: OpcodeList1
type_name: UNDEFINED
- id: 0xc741
name: OpcodeList2
type_name: UNDEFINED
- id: 0xc74e
name: OpcodeList3
type_name: UNDEFINED
- id: 0xc761
name: NoiseProfile
type_name: DOUBLE
IFD/Exif/Iop:
- id: 0x0001
name: InteroperabilityIndex
type_name: ASCII
- id: 0x0002
name: InteroperabilityVersion
type_name: UNDEFINED
- id: 0x1000
name: RelatedImageFileFormat
type_name: ASCII
- id: 0x1001
name: RelatedImageWidth
type_name: LONG
- id: 0x1002
name: RelatedImageLength
type_name: LONG
`
)

417
vendor/github.com/dsoprea/go-exif/tags_undefined.go generated vendored Normal file
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@ -0,0 +1,417 @@
package exif
import (
"bytes"
"fmt"
"strings"
"crypto/sha1"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
const (
UnparseableUnknownTagValuePlaceholder = "!UNKNOWN"
)
// TODO(dustin): Rename "unknown" in symbol names to "undefined" in the next release.
//
// See https://github.com/dsoprea/go-exif/issues/27 .
const (
TagUnknownType_9298_UserComment_Encoding_ASCII = iota
TagUnknownType_9298_UserComment_Encoding_JIS = iota
TagUnknownType_9298_UserComment_Encoding_UNICODE = iota
TagUnknownType_9298_UserComment_Encoding_UNDEFINED = iota
)
const (
TagUnknownType_9101_ComponentsConfiguration_Channel_Y = 0x1
TagUnknownType_9101_ComponentsConfiguration_Channel_Cb = 0x2
TagUnknownType_9101_ComponentsConfiguration_Channel_Cr = 0x3
TagUnknownType_9101_ComponentsConfiguration_Channel_R = 0x4
TagUnknownType_9101_ComponentsConfiguration_Channel_G = 0x5
TagUnknownType_9101_ComponentsConfiguration_Channel_B = 0x6
)
const (
TagUnknownType_9101_ComponentsConfiguration_OTHER = iota
TagUnknownType_9101_ComponentsConfiguration_RGB = iota
TagUnknownType_9101_ComponentsConfiguration_YCBCR = iota
)
var (
TagUnknownType_9298_UserComment_Encoding_Names = map[int]string{
TagUnknownType_9298_UserComment_Encoding_ASCII: "ASCII",
TagUnknownType_9298_UserComment_Encoding_JIS: "JIS",
TagUnknownType_9298_UserComment_Encoding_UNICODE: "UNICODE",
TagUnknownType_9298_UserComment_Encoding_UNDEFINED: "UNDEFINED",
}
TagUnknownType_9298_UserComment_Encodings = map[int][]byte{
TagUnknownType_9298_UserComment_Encoding_ASCII: {'A', 'S', 'C', 'I', 'I', 0, 0, 0},
TagUnknownType_9298_UserComment_Encoding_JIS: {'J', 'I', 'S', 0, 0, 0, 0, 0},
TagUnknownType_9298_UserComment_Encoding_UNICODE: {'U', 'n', 'i', 'c', 'o', 'd', 'e', 0},
TagUnknownType_9298_UserComment_Encoding_UNDEFINED: {0, 0, 0, 0, 0, 0, 0, 0},
}
TagUnknownType_9101_ComponentsConfiguration_Names = map[int]string{
TagUnknownType_9101_ComponentsConfiguration_OTHER: "OTHER",
TagUnknownType_9101_ComponentsConfiguration_RGB: "RGB",
TagUnknownType_9101_ComponentsConfiguration_YCBCR: "YCBCR",
}
TagUnknownType_9101_ComponentsConfiguration_Configurations = map[int][]byte{
TagUnknownType_9101_ComponentsConfiguration_RGB: {
TagUnknownType_9101_ComponentsConfiguration_Channel_R,
TagUnknownType_9101_ComponentsConfiguration_Channel_G,
TagUnknownType_9101_ComponentsConfiguration_Channel_B,
0,
},
TagUnknownType_9101_ComponentsConfiguration_YCBCR: {
TagUnknownType_9101_ComponentsConfiguration_Channel_Y,
TagUnknownType_9101_ComponentsConfiguration_Channel_Cb,
TagUnknownType_9101_ComponentsConfiguration_Channel_Cr,
0,
},
}
)
// TODO(dustin): Rename `UnknownTagValue` to `UndefinedTagValue`.
type UnknownTagValue interface {
ValueBytes() ([]byte, error)
}
// TODO(dustin): Rename `TagUnknownType_GeneralString` to `TagUnknownType_GeneralString`.
type TagUnknownType_GeneralString string
func (gs TagUnknownType_GeneralString) ValueBytes() (value []byte, err error) {
return []byte(gs), nil
}
// TODO(dustin): Rename `TagUnknownType_9298_UserComment` to `TagUndefinedType_9298_UserComment`.
type TagUnknownType_9298_UserComment struct {
EncodingType int
EncodingBytes []byte
}
func (uc TagUnknownType_9298_UserComment) String() string {
var valuePhrase string
if len(uc.EncodingBytes) <= 8 {
valuePhrase = fmt.Sprintf("%v", uc.EncodingBytes)
} else {
valuePhrase = fmt.Sprintf("%v...", uc.EncodingBytes[:8])
}
return fmt.Sprintf("UserComment<SIZE=(%d) ENCODING=[%s] V=%v LEN=(%d)>", len(uc.EncodingBytes), TagUnknownType_9298_UserComment_Encoding_Names[uc.EncodingType], valuePhrase, len(uc.EncodingBytes))
}
func (uc TagUnknownType_9298_UserComment) ValueBytes() (value []byte, err error) {
encodingTypeBytes, found := TagUnknownType_9298_UserComment_Encodings[uc.EncodingType]
if found == false {
log.Panicf("encoding-type not valid for unknown-type tag 9298 (UserComment): (%d)", uc.EncodingType)
}
value = make([]byte, len(uc.EncodingBytes)+8)
copy(value[:8], encodingTypeBytes)
copy(value[8:], uc.EncodingBytes)
return value, nil
}
// TODO(dustin): Rename `TagUnknownType_927C_MakerNote` to `TagUndefinedType_927C_MakerNote`.
type TagUnknownType_927C_MakerNote struct {
MakerNoteType []byte
MakerNoteBytes []byte
}
func (mn TagUnknownType_927C_MakerNote) String() string {
parts := make([]string, 20)
for i, c := range mn.MakerNoteType {
parts[i] = fmt.Sprintf("%02x", c)
}
h := sha1.New()
_, err := h.Write(mn.MakerNoteBytes)
log.PanicIf(err)
digest := h.Sum(nil)
return fmt.Sprintf("MakerNote<TYPE-ID=[%s] LEN=(%d) SHA1=[%020x]>", strings.Join(parts, " "), len(mn.MakerNoteBytes), digest)
}
func (uc TagUnknownType_927C_MakerNote) ValueBytes() (value []byte, err error) {
return uc.MakerNoteBytes, nil
}
// TODO(dustin): Rename `TagUnknownType_9101_ComponentsConfiguration` to `TagUndefinedType_9101_ComponentsConfiguration`.
type TagUnknownType_9101_ComponentsConfiguration struct {
ConfigurationId int
ConfigurationBytes []byte
}
func (cc TagUnknownType_9101_ComponentsConfiguration) String() string {
return fmt.Sprintf("ComponentsConfiguration<ID=[%s] BYTES=%v>", TagUnknownType_9101_ComponentsConfiguration_Names[cc.ConfigurationId], cc.ConfigurationBytes)
}
func (uc TagUnknownType_9101_ComponentsConfiguration) ValueBytes() (value []byte, err error) {
return uc.ConfigurationBytes, nil
}
// TODO(dustin): Rename `EncodeUnknown_9286` to `EncodeUndefined_9286`.
func EncodeUnknown_9286(uc TagUnknownType_9298_UserComment) (encoded []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
b := new(bytes.Buffer)
encodingTypeBytes := TagUnknownType_9298_UserComment_Encodings[uc.EncodingType]
_, err = b.Write(encodingTypeBytes)
log.PanicIf(err)
_, err = b.Write(uc.EncodingBytes)
log.PanicIf(err)
return b.Bytes(), nil
}
type EncodeableUndefinedValue struct {
IfdPath string
TagId uint16
Parameters interface{}
}
func EncodeUndefined(ifdPath string, tagId uint16, value interface{}) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): !! Finish implementing these.
if ifdPath == IfdPathStandardExif {
if tagId == 0x9286 {
encoded, err := EncodeUnknown_9286(value.(TagUnknownType_9298_UserComment))
log.PanicIf(err)
ed.Type = TypeUndefined
ed.Encoded = encoded
ed.UnitCount = uint32(len(encoded))
return ed, nil
}
}
log.Panicf("undefined value not encodable: %s (0x%02x)", ifdPath, tagId)
// Never called.
return EncodedData{}, nil
}
// TODO(dustin): Rename `TagUnknownType_UnknownValue` to `TagUndefinedType_UnknownValue`.
type TagUnknownType_UnknownValue []byte
func (tutuv TagUnknownType_UnknownValue) String() string {
parts := make([]string, len(tutuv))
for i, c := range tutuv {
parts[i] = fmt.Sprintf("%02x", c)
}
h := sha1.New()
_, err := h.Write(tutuv)
log.PanicIf(err)
digest := h.Sum(nil)
return fmt.Sprintf("Unknown<DATA=[%s] LEN=(%d) SHA1=[%020x]>", strings.Join(parts, " "), len(tutuv), digest)
}
// UndefinedValue knows how to resolve the value for most unknown-type tags.
func UndefinedValue(ifdPath string, tagId uint16, valueContext interface{}, byteOrder binary.ByteOrder) (value interface{}, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): Stop exporting this. Use `(*ValueContext).Undefined()`.
var valueContextPtr *ValueContext
if vc, ok := valueContext.(*ValueContext); ok == true {
// Legacy usage.
valueContextPtr = vc
} else {
// Standard usage.
valueContextValue := valueContext.(ValueContext)
valueContextPtr = &valueContextValue
}
typeLogger.Debugf(nil, "UndefinedValue: IFD-PATH=[%s] TAG-ID=(0x%02x)", ifdPath, tagId)
if ifdPath == IfdPathStandardExif {
if tagId == 0x9000 {
// ExifVersion
valueContextPtr.SetUnknownValueType(TypeAsciiNoNul)
valueString, err := valueContextPtr.ReadAsciiNoNul()
log.PanicIf(err)
return TagUnknownType_GeneralString(valueString), nil
} else if tagId == 0xa000 {
// FlashpixVersion
valueContextPtr.SetUnknownValueType(TypeAsciiNoNul)
valueString, err := valueContextPtr.ReadAsciiNoNul()
log.PanicIf(err)
return TagUnknownType_GeneralString(valueString), nil
} else if tagId == 0x9286 {
// UserComment
valueContextPtr.SetUnknownValueType(TypeByte)
valueBytes, err := valueContextPtr.ReadBytes()
log.PanicIf(err)
unknownUc := TagUnknownType_9298_UserComment{
EncodingType: TagUnknownType_9298_UserComment_Encoding_UNDEFINED,
EncodingBytes: []byte{},
}
encoding := valueBytes[:8]
for encodingIndex, encodingBytes := range TagUnknownType_9298_UserComment_Encodings {
if bytes.Compare(encoding, encodingBytes) == 0 {
uc := TagUnknownType_9298_UserComment{
EncodingType: encodingIndex,
EncodingBytes: valueBytes[8:],
}
return uc, nil
}
}
typeLogger.Warningf(nil, "User-comment encoding not valid. Returning 'unknown' type (the default).")
return unknownUc, nil
} else if tagId == 0x927c {
// MakerNote
// TODO(dustin): !! This is the Wild Wild West. This very well might be a child IFD, but any and all OEM's define their own formats. If we're going to be writing changes and this is complete EXIF (which may not have the first eight bytes), it might be fine. However, if these are just IFDs they'll be relative to the main EXIF, this will invalidate the MakerNote data for IFDs and any other implementations that use offsets unless we can interpret them all. It be best to return to this later and just exclude this from being written for now, though means a loss of a wealth of image metadata.
// -> We can also just blindly try to interpret as an IFD and just validate that it's looks good (maybe it will even have a 'next ifd' pointer that we can validate is 0x0).
valueContextPtr.SetUnknownValueType(TypeByte)
valueBytes, err := valueContextPtr.ReadBytes()
log.PanicIf(err)
// TODO(dustin): Doesn't work, but here as an example.
// ie := NewIfdEnumerate(valueBytes, byteOrder)
// // TODO(dustin): !! Validate types (might have proprietary types, but it might be worth splitting the list between valid and not valid; maybe fail if a certain proportion are invalid, or maybe aren't less then a certain small integer)?
// ii, err := ie.Collect(0x0)
// for _, entry := range ii.RootIfd.Entries {
// fmt.Printf("ENTRY: 0x%02x %d\n", entry.TagId, entry.TagType)
// }
mn := TagUnknownType_927C_MakerNote{
MakerNoteType: valueBytes[:20],
// MakerNoteBytes has the whole length of bytes. There's always
// the chance that the first 20 bytes includes actual data.
MakerNoteBytes: valueBytes,
}
return mn, nil
} else if tagId == 0x9101 {
// ComponentsConfiguration
valueContextPtr.SetUnknownValueType(TypeByte)
valueBytes, err := valueContextPtr.ReadBytes()
log.PanicIf(err)
for configurationId, configurationBytes := range TagUnknownType_9101_ComponentsConfiguration_Configurations {
if bytes.Compare(valueBytes, configurationBytes) == 0 {
cc := TagUnknownType_9101_ComponentsConfiguration{
ConfigurationId: configurationId,
ConfigurationBytes: valueBytes,
}
return cc, nil
}
}
cc := TagUnknownType_9101_ComponentsConfiguration{
ConfigurationId: TagUnknownType_9101_ComponentsConfiguration_OTHER,
ConfigurationBytes: valueBytes,
}
return cc, nil
}
} else if ifdPath == IfdPathStandardGps {
if tagId == 0x001c {
// GPSAreaInformation
valueContextPtr.SetUnknownValueType(TypeAsciiNoNul)
valueString, err := valueContextPtr.ReadAsciiNoNul()
log.PanicIf(err)
return TagUnknownType_GeneralString(valueString), nil
} else if tagId == 0x001b {
// GPSProcessingMethod
valueContextPtr.SetUnknownValueType(TypeAsciiNoNul)
valueString, err := valueContextPtr.ReadAsciiNoNul()
log.PanicIf(err)
return TagUnknownType_GeneralString(valueString), nil
}
} else if ifdPath == IfdPathStandardExifIop {
if tagId == 0x0002 {
// InteropVersion
valueContextPtr.SetUnknownValueType(TypeAsciiNoNul)
valueString, err := valueContextPtr.ReadAsciiNoNul()
log.PanicIf(err)
return TagUnknownType_GeneralString(valueString), nil
}
}
// TODO(dustin): !! Still need to do:
//
// complex: 0xa302, 0xa20c, 0x8828
// long: 0xa301, 0xa300
//
// 0xa40b is device-specific and unhandled.
//
// See https://github.com/dsoprea/go-exif/issues/26.
// We have no choice but to return the error. We have no way of knowing how
// much data there is without already knowing what data-type this tag is.
return nil, ErrUnhandledUnknownTypedTag
}

310
vendor/github.com/dsoprea/go-exif/type.go generated vendored Normal file
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package exif
import (
"errors"
"fmt"
"strconv"
"strings"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
type TagTypePrimitive uint16
func (typeType TagTypePrimitive) String() string {
return TypeNames[typeType]
}
func (tagType TagTypePrimitive) Size() int {
if tagType == TypeByte {
return 1
} else if tagType == TypeAscii || tagType == TypeAsciiNoNul {
return 1
} else if tagType == TypeShort {
return 2
} else if tagType == TypeLong {
return 4
} else if tagType == TypeRational {
return 8
} else if tagType == TypeSignedLong {
return 4
} else if tagType == TypeSignedRational {
return 8
} else {
log.Panicf("can not determine tag-value size for type (%d): [%s]", tagType, TypeNames[tagType])
// Never called.
return 0
}
}
const (
TypeByte TagTypePrimitive = 1
TypeAscii TagTypePrimitive = 2
TypeShort TagTypePrimitive = 3
TypeLong TagTypePrimitive = 4
TypeRational TagTypePrimitive = 5
TypeUndefined TagTypePrimitive = 7
TypeSignedLong TagTypePrimitive = 9
TypeSignedRational TagTypePrimitive = 10
// TypeAsciiNoNul is just a pseudo-type, for our own purposes.
TypeAsciiNoNul TagTypePrimitive = 0xf0
)
var (
typeLogger = log.NewLogger("exif.type")
)
var (
// TODO(dustin): Rename TypeNames() to typeNames() and add getter.
TypeNames = map[TagTypePrimitive]string{
TypeByte: "BYTE",
TypeAscii: "ASCII",
TypeShort: "SHORT",
TypeLong: "LONG",
TypeRational: "RATIONAL",
TypeUndefined: "UNDEFINED",
TypeSignedLong: "SLONG",
TypeSignedRational: "SRATIONAL",
TypeAsciiNoNul: "_ASCII_NO_NUL",
}
TypeNamesR = map[string]TagTypePrimitive{}
)
var (
// ErrNotEnoughData is used when there isn't enough data to accomodate what
// we're trying to parse (sizeof(type) * unit_count).
ErrNotEnoughData = errors.New("not enough data for type")
// ErrWrongType is used when we try to parse anything other than the
// current type.
ErrWrongType = errors.New("wrong type, can not parse")
// ErrUnhandledUnknownTag is used when we try to parse a tag that's
// recorded as an "unknown" type but not a documented tag (therefore
// leaving us not knowning how to read it).
ErrUnhandledUnknownTypedTag = errors.New("not a standard unknown-typed tag")
)
type Rational struct {
Numerator uint32
Denominator uint32
}
type SignedRational struct {
Numerator int32
Denominator int32
}
func TagTypeSize(tagType TagTypePrimitive) int {
// DEPRECATED(dustin): `(TagTypePrimitive).Size()` should be used, directly.
return tagType.Size()
}
// Format returns a stringified value for the given bytes. Automatically
// calculates count based on type size.
func Format(rawBytes []byte, tagType TagTypePrimitive, justFirst bool, byteOrder binary.ByteOrder) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): !! Add tests
typeSize := tagType.Size()
if len(rawBytes)%typeSize != 0 {
log.Panicf("byte-count (%d) does not align for [%s] type with a size of (%d) bytes", len(rawBytes), TypeNames[tagType], typeSize)
}
// unitCount is the calculated unit-count. This should equal the original
// value from the tag (pre-resolution).
unitCount := uint32(len(rawBytes) / typeSize)
// Truncate the items if it's not bytes or a string and we just want the first.
valueSuffix := ""
if justFirst == true && unitCount > 1 && tagType != TypeByte && tagType != TypeAscii && tagType != TypeAsciiNoNul {
unitCount = 1
valueSuffix = "..."
}
if tagType == TypeByte {
items, err := parser.ParseBytes(rawBytes, unitCount)
log.PanicIf(err)
return DumpBytesToString(items), nil
} else if tagType == TypeAscii {
phrase, err := parser.ParseAscii(rawBytes, unitCount)
log.PanicIf(err)
return phrase, nil
} else if tagType == TypeAsciiNoNul {
phrase, err := parser.ParseAsciiNoNul(rawBytes, unitCount)
log.PanicIf(err)
return phrase, nil
} else if tagType == TypeShort {
items, err := parser.ParseShorts(rawBytes, unitCount, byteOrder)
log.PanicIf(err)
if len(items) > 0 {
if justFirst == true {
return fmt.Sprintf("%v%s", items[0], valueSuffix), nil
} else {
return fmt.Sprintf("%v", items), nil
}
} else {
return "", nil
}
} else if tagType == TypeLong {
items, err := parser.ParseLongs(rawBytes, unitCount, byteOrder)
log.PanicIf(err)
if len(items) > 0 {
if justFirst == true {
return fmt.Sprintf("%v%s", items[0], valueSuffix), nil
} else {
return fmt.Sprintf("%v", items), nil
}
} else {
return "", nil
}
} else if tagType == TypeRational {
items, err := parser.ParseRationals(rawBytes, unitCount, byteOrder)
log.PanicIf(err)
if len(items) > 0 {
parts := make([]string, len(items))
for i, r := range items {
parts[i] = fmt.Sprintf("%d/%d", r.Numerator, r.Denominator)
}
if justFirst == true {
return fmt.Sprintf("%v%s", parts[0], valueSuffix), nil
} else {
return fmt.Sprintf("%v", parts), nil
}
} else {
return "", nil
}
} else if tagType == TypeSignedLong {
items, err := parser.ParseSignedLongs(rawBytes, unitCount, byteOrder)
log.PanicIf(err)
if len(items) > 0 {
if justFirst == true {
return fmt.Sprintf("%v%s", items[0], valueSuffix), nil
} else {
return fmt.Sprintf("%v", items), nil
}
} else {
return "", nil
}
} else if tagType == TypeSignedRational {
items, err := parser.ParseSignedRationals(rawBytes, unitCount, byteOrder)
log.PanicIf(err)
parts := make([]string, len(items))
for i, r := range items {
parts[i] = fmt.Sprintf("%d/%d", r.Numerator, r.Denominator)
}
if len(items) > 0 {
if justFirst == true {
return fmt.Sprintf("%v%s", parts[0], valueSuffix), nil
} else {
return fmt.Sprintf("%v", parts), nil
}
} else {
return "", nil
}
} else {
// Affects only "unknown" values, in general.
log.Panicf("value of type [%s] can not be formatted into string", tagType.String())
// Never called.
return "", nil
}
}
func EncodeStringToBytes(tagType TagTypePrimitive, valueString string) (value interface{}, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
if tagType == TypeUndefined {
// TODO(dustin): Circle back to this.
log.Panicf("undefined-type values are not supported")
}
if tagType == TypeByte {
return []byte(valueString), nil
} else if tagType == TypeAscii || tagType == TypeAsciiNoNul {
// Whether or not we're putting an NUL on the end is only relevant for
// byte-level encoding. This function really just supports a user
// interface.
return valueString, nil
} else if tagType == TypeShort {
n, err := strconv.ParseUint(valueString, 10, 16)
log.PanicIf(err)
return uint16(n), nil
} else if tagType == TypeLong {
n, err := strconv.ParseUint(valueString, 10, 32)
log.PanicIf(err)
return uint32(n), nil
} else if tagType == TypeRational {
parts := strings.SplitN(valueString, "/", 2)
numerator, err := strconv.ParseUint(parts[0], 10, 32)
log.PanicIf(err)
denominator, err := strconv.ParseUint(parts[1], 10, 32)
log.PanicIf(err)
return Rational{
Numerator: uint32(numerator),
Denominator: uint32(denominator),
}, nil
} else if tagType == TypeSignedLong {
n, err := strconv.ParseInt(valueString, 10, 32)
log.PanicIf(err)
return int32(n), nil
} else if tagType == TypeSignedRational {
parts := strings.SplitN(valueString, "/", 2)
numerator, err := strconv.ParseInt(parts[0], 10, 32)
log.PanicIf(err)
denominator, err := strconv.ParseInt(parts[1], 10, 32)
log.PanicIf(err)
return SignedRational{
Numerator: int32(numerator),
Denominator: int32(denominator),
}, nil
}
log.Panicf("from-string encoding for type not supported; this shouldn't happen: [%s]", tagType.String())
return nil, nil
}
func init() {
for typeId, typeName := range TypeNames {
TypeNamesR[typeName] = typeId
}
}

262
vendor/github.com/dsoprea/go-exif/type_encode.go generated vendored Normal file
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package exif
import (
"bytes"
"reflect"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
var (
typeEncodeLogger = log.NewLogger("exif.type_encode")
)
// EncodedData encapsulates the compound output of an encoding operation.
type EncodedData struct {
Type TagTypePrimitive
Encoded []byte
// TODO(dustin): Is this really necessary? We might have this just to correlate to the incoming stream format (raw bytes and a unit-count both for incoming and outgoing).
UnitCount uint32
}
type ValueEncoder struct {
byteOrder binary.ByteOrder
}
func NewValueEncoder(byteOrder binary.ByteOrder) *ValueEncoder {
return &ValueEncoder{
byteOrder: byteOrder,
}
}
func (ve *ValueEncoder) encodeBytes(value []uint8) (ed EncodedData, err error) {
ed.Type = TypeByte
ed.Encoded = []byte(value)
ed.UnitCount = uint32(len(value))
return ed, nil
}
func (ve *ValueEncoder) encodeAscii(value string) (ed EncodedData, err error) {
ed.Type = TypeAscii
ed.Encoded = []byte(value)
ed.Encoded = append(ed.Encoded, 0)
ed.UnitCount = uint32(len(ed.Encoded))
return ed, nil
}
// encodeAsciiNoNul returns a string encoded as a byte-string without a trailing
// NUL byte.
//
// Note that:
//
// 1. This type can not be automatically encoded using `Encode()`. The default
// mode is to encode *with* a trailing NUL byte using `encodeAscii`. Only
// certain undefined-type tags using an unterminated ASCII string and these
// are exceptional in nature.
//
// 2. The presence of this method allows us to completely test the complimentary
// no-nul parser.
//
func (ve *ValueEncoder) encodeAsciiNoNul(value string) (ed EncodedData, err error) {
ed.Type = TypeAsciiNoNul
ed.Encoded = []byte(value)
ed.UnitCount = uint32(len(ed.Encoded))
return ed, nil
}
func (ve *ValueEncoder) encodeShorts(value []uint16) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ed.UnitCount = uint32(len(value))
ed.Encoded = make([]byte, ed.UnitCount*2)
for i := uint32(0); i < ed.UnitCount; i++ {
ve.byteOrder.PutUint16(ed.Encoded[i*2:(i+1)*2], value[i])
}
ed.Type = TypeShort
return ed, nil
}
func (ve *ValueEncoder) encodeLongs(value []uint32) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ed.UnitCount = uint32(len(value))
ed.Encoded = make([]byte, ed.UnitCount*4)
for i := uint32(0); i < ed.UnitCount; i++ {
ve.byteOrder.PutUint32(ed.Encoded[i*4:(i+1)*4], value[i])
}
ed.Type = TypeLong
return ed, nil
}
func (ve *ValueEncoder) encodeRationals(value []Rational) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ed.UnitCount = uint32(len(value))
ed.Encoded = make([]byte, ed.UnitCount*8)
for i := uint32(0); i < ed.UnitCount; i++ {
ve.byteOrder.PutUint32(ed.Encoded[i*8+0:i*8+4], value[i].Numerator)
ve.byteOrder.PutUint32(ed.Encoded[i*8+4:i*8+8], value[i].Denominator)
}
ed.Type = TypeRational
return ed, nil
}
func (ve *ValueEncoder) encodeSignedLongs(value []int32) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ed.UnitCount = uint32(len(value))
b := bytes.NewBuffer(make([]byte, 0, 8*ed.UnitCount))
for i := uint32(0); i < ed.UnitCount; i++ {
err := binary.Write(b, ve.byteOrder, value[i])
log.PanicIf(err)
}
ed.Type = TypeSignedLong
ed.Encoded = b.Bytes()
return ed, nil
}
func (ve *ValueEncoder) encodeSignedRationals(value []SignedRational) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ed.UnitCount = uint32(len(value))
b := bytes.NewBuffer(make([]byte, 0, 8*ed.UnitCount))
for i := uint32(0); i < ed.UnitCount; i++ {
err := binary.Write(b, ve.byteOrder, value[i].Numerator)
log.PanicIf(err)
err = binary.Write(b, ve.byteOrder, value[i].Denominator)
log.PanicIf(err)
}
ed.Type = TypeSignedRational
ed.Encoded = b.Bytes()
return ed, nil
}
// Encode returns bytes for the given value, infering type from the actual
// value. This does not support `TypeAsciiNoNull` (all strings are encoded as
// `TypeAscii`).
func (ve *ValueEncoder) Encode(value interface{}) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): This is redundant with EncodeWithType. Refactor one to use the other.
switch value.(type) {
case []byte:
ed, err = ve.encodeBytes(value.([]byte))
log.PanicIf(err)
case string:
ed, err = ve.encodeAscii(value.(string))
log.PanicIf(err)
case []uint16:
ed, err = ve.encodeShorts(value.([]uint16))
log.PanicIf(err)
case []uint32:
ed, err = ve.encodeLongs(value.([]uint32))
log.PanicIf(err)
case []Rational:
ed, err = ve.encodeRationals(value.([]Rational))
log.PanicIf(err)
case []int32:
ed, err = ve.encodeSignedLongs(value.([]int32))
log.PanicIf(err)
case []SignedRational:
ed, err = ve.encodeSignedRationals(value.([]SignedRational))
log.PanicIf(err)
default:
log.Panicf("value not encodable: [%s] [%v]", reflect.TypeOf(value), value)
}
return ed, nil
}
// EncodeWithType returns bytes for the given value, using the given `TagType`
// value to determine how to encode. This supports `TypeAsciiNoNul`.
func (ve *ValueEncoder) EncodeWithType(tt TagType, value interface{}) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): This is redundant with Encode. Refactor one to use the other.
switch tt.Type() {
case TypeByte:
ed, err = ve.encodeBytes(value.([]byte))
log.PanicIf(err)
case TypeAscii:
ed, err = ve.encodeAscii(value.(string))
log.PanicIf(err)
case TypeAsciiNoNul:
ed, err = ve.encodeAsciiNoNul(value.(string))
log.PanicIf(err)
case TypeShort:
ed, err = ve.encodeShorts(value.([]uint16))
log.PanicIf(err)
case TypeLong:
ed, err = ve.encodeLongs(value.([]uint32))
log.PanicIf(err)
case TypeRational:
ed, err = ve.encodeRationals(value.([]Rational))
log.PanicIf(err)
case TypeSignedLong:
ed, err = ve.encodeSignedLongs(value.([]int32))
log.PanicIf(err)
case TypeSignedRational:
ed, err = ve.encodeSignedRationals(value.([]SignedRational))
log.PanicIf(err)
default:
log.Panicf("value not encodable (with type): %v [%v]", tt, value)
}
return ed, nil
}

222
vendor/github.com/dsoprea/go-exif/utility.go generated vendored Normal file
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package exif
import (
"bytes"
"fmt"
"strconv"
"strings"
"time"
"github.com/dsoprea/go-logging"
)
func DumpBytes(data []byte) {
fmt.Printf("DUMP: ")
for _, x := range data {
fmt.Printf("%02x ", x)
}
fmt.Printf("\n")
}
func DumpBytesClause(data []byte) {
fmt.Printf("DUMP: ")
fmt.Printf("[]byte { ")
for i, x := range data {
fmt.Printf("0x%02x", x)
if i < len(data)-1 {
fmt.Printf(", ")
}
}
fmt.Printf(" }\n")
}
func DumpBytesToString(data []byte) string {
b := new(bytes.Buffer)
for i, x := range data {
_, err := b.WriteString(fmt.Sprintf("%02x", x))
log.PanicIf(err)
if i < len(data)-1 {
_, err := b.WriteRune(' ')
log.PanicIf(err)
}
}
return b.String()
}
func DumpBytesClauseToString(data []byte) string {
b := new(bytes.Buffer)
for i, x := range data {
_, err := b.WriteString(fmt.Sprintf("0x%02x", x))
log.PanicIf(err)
if i < len(data)-1 {
_, err := b.WriteString(", ")
log.PanicIf(err)
}
}
return b.String()
}
// ParseExifFullTimestamp parses dates like "2018:11:30 13:01:49" into a UTC
// `time.Time` struct.
func ParseExifFullTimestamp(fullTimestampPhrase string) (timestamp time.Time, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
parts := strings.Split(fullTimestampPhrase, " ")
datestampValue, timestampValue := parts[0], parts[1]
dateParts := strings.Split(datestampValue, ":")
year, err := strconv.ParseUint(dateParts[0], 10, 16)
if err != nil {
log.Panicf("could not parse year")
}
month, err := strconv.ParseUint(dateParts[1], 10, 8)
if err != nil {
log.Panicf("could not parse month")
}
day, err := strconv.ParseUint(dateParts[2], 10, 8)
if err != nil {
log.Panicf("could not parse day")
}
timeParts := strings.Split(timestampValue, ":")
hour, err := strconv.ParseUint(timeParts[0], 10, 8)
if err != nil {
log.Panicf("could not parse hour")
}
minute, err := strconv.ParseUint(timeParts[1], 10, 8)
if err != nil {
log.Panicf("could not parse minute")
}
second, err := strconv.ParseUint(timeParts[2], 10, 8)
if err != nil {
log.Panicf("could not parse second")
}
timestamp = time.Date(int(year), time.Month(month), int(day), int(hour), int(minute), int(second), 0, time.UTC)
return timestamp, nil
}
// ExifFullTimestampString produces a string like "2018:11:30 13:01:49" from a
// `time.Time` struct. It will attempt to convert to UTC first.
func ExifFullTimestampString(t time.Time) (fullTimestampPhrase string) {
t = t.UTC()
return fmt.Sprintf("%04d:%02d:%02d %02d:%02d:%02d", t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second())
}
// ExifTag is one simple representation of a tag in a flat list of all of them.
type ExifTag struct {
IfdPath string `json:"ifd_path"`
TagId uint16 `json:"id"`
TagName string `json:"name"`
TagTypeId TagTypePrimitive `json:"type_id"`
TagTypeName string `json:"type_name"`
Value interface{} `json:"value"`
ValueBytes []byte `json:"value_bytes"`
ChildIfdPath string `json:"child_ifd_path"`
}
// String returns a string representation.
func (et ExifTag) String() string {
return fmt.Sprintf("ExifTag<IFD-PATH=[%s] TAG-ID=(0x%02x) TAG-NAME=[%s] TAG-TYPE=[%s] VALUE=[%v] VALUE-BYTES=(%d) CHILD-IFD-PATH=[%s]", et.IfdPath, et.TagId, et.TagName, et.TagTypeName, et.Value, len(et.ValueBytes), et.ChildIfdPath)
}
// GetFlatExifData returns a simple, flat representation of all tags.
func GetFlatExifData(exifData []byte) (exifTags []ExifTag, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
im := NewIfdMappingWithStandard()
ti := NewTagIndex()
_, index, err := Collect(im, ti, exifData)
log.PanicIf(err)
q := []*Ifd{index.RootIfd}
exifTags = make([]ExifTag, 0)
for len(q) > 0 {
var ifd *Ifd
ifd, q = q[0], q[1:]
ti := NewTagIndex()
for _, ite := range ifd.Entries {
tagName := ""
it, err := ti.Get(ifd.IfdPath, ite.TagId)
if err != nil {
// If it's a non-standard tag, just leave the name blank.
if log.Is(err, ErrTagNotFound) != true {
log.PanicIf(err)
}
} else {
tagName = it.Name
}
value, err := ifd.TagValue(ite)
if err != nil {
if err == ErrUnhandledUnknownTypedTag {
value = UnparseableUnknownTagValuePlaceholder
} else {
log.Panic(err)
}
}
valueBytes, err := ifd.TagValueBytes(ite)
if err != nil && err != ErrUnhandledUnknownTypedTag {
log.Panic(err)
}
et := ExifTag{
IfdPath: ifd.IfdPath,
TagId: ite.TagId,
TagName: tagName,
TagTypeId: ite.TagType,
TagTypeName: TypeNames[ite.TagType],
Value: value,
ValueBytes: valueBytes,
ChildIfdPath: ite.ChildIfdPath,
}
exifTags = append(exifTags, et)
}
for _, childIfd := range ifd.Children {
q = append(q, childIfd)
}
if ifd.NextIfd != nil {
q = append(q, ifd.NextIfd)
}
}
return exifTags, nil
}

0
vendor/github.com/dsoprea/go-exif/v2/.MODULE_ROOT generated vendored Normal file
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9
vendor/github.com/dsoprea/go-exif/v2/LICENSE generated vendored Normal file
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MIT LICENSE
Copyright 2019 Dustin Oprea
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

659
vendor/github.com/dsoprea/go-exif/v2/common/ifd.go generated vendored Normal file
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package exifcommon
import (
"errors"
"fmt"
"strings"
"github.com/dsoprea/go-logging"
)
var (
ifdLogger = log.NewLogger("exifcommon.ifd")
)
var (
ErrChildIfdNotMapped = errors.New("no child-IFD for that tag-ID under parent")
)
// MappedIfd is one node in the IFD-mapping.
type MappedIfd struct {
ParentTagId uint16
Placement []uint16
Path []string
Name string
TagId uint16
Children map[uint16]*MappedIfd
}
// String returns a descriptive string.
func (mi *MappedIfd) String() string {
pathPhrase := mi.PathPhrase()
return fmt.Sprintf("MappedIfd<(0x%04X) [%s] PATH=[%s]>", mi.TagId, mi.Name, pathPhrase)
}
// PathPhrase returns a non-fully-qualified IFD path.
func (mi *MappedIfd) PathPhrase() string {
return strings.Join(mi.Path, "/")
}
// TODO(dustin): Refactor this to use IfdIdentity structs.
// IfdMapping describes all of the IFDs that we currently recognize.
type IfdMapping struct {
rootNode *MappedIfd
}
// NewIfdMapping returns a new IfdMapping struct.
func NewIfdMapping() (ifdMapping *IfdMapping) {
rootNode := &MappedIfd{
Path: make([]string, 0),
Children: make(map[uint16]*MappedIfd),
}
return &IfdMapping{
rootNode: rootNode,
}
}
// NewIfdMappingWithStandard retruns a new IfdMapping struct preloaded with the
// standard IFDs.
func NewIfdMappingWithStandard() (ifdMapping *IfdMapping) {
defer func() {
if state := recover(); state != nil {
err := log.Wrap(state.(error))
log.Panic(err)
}
}()
im := NewIfdMapping()
err := LoadStandardIfds(im)
log.PanicIf(err)
return im
}
// Get returns the node given the path slice.
func (im *IfdMapping) Get(parentPlacement []uint16) (childIfd *MappedIfd, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ptr := im.rootNode
for _, tagId := range parentPlacement {
if descendantPtr, found := ptr.Children[tagId]; found == false {
log.Panicf("ifd child with tag-ID (%04x) not registered: [%s]", tagId, ptr.PathPhrase())
} else {
ptr = descendantPtr
}
}
return ptr, nil
}
// GetWithPath returns the node given the path string.
func (im *IfdMapping) GetWithPath(pathPhrase string) (mi *MappedIfd, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
if pathPhrase == "" {
log.Panicf("path-phrase is empty")
}
path := strings.Split(pathPhrase, "/")
ptr := im.rootNode
for _, name := range path {
var hit *MappedIfd
for _, mi := range ptr.Children {
if mi.Name == name {
hit = mi
break
}
}
if hit == nil {
log.Panicf("ifd child with name [%s] not registered: [%s]", name, ptr.PathPhrase())
}
ptr = hit
}
return ptr, nil
}
// GetChild is a convenience function to get the child path for a given parent
// placement and child tag-ID.
func (im *IfdMapping) GetChild(parentPathPhrase string, tagId uint16) (mi *MappedIfd, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
mi, err = im.GetWithPath(parentPathPhrase)
log.PanicIf(err)
for _, childMi := range mi.Children {
if childMi.TagId == tagId {
return childMi, nil
}
}
// Whether or not an IFD is defined in data, such an IFD is not registered
// and would be unknown.
log.Panic(ErrChildIfdNotMapped)
return nil, nil
}
// IfdTagIdAndIndex represents a specific part of the IFD path.
//
// This is a legacy type.
type IfdTagIdAndIndex struct {
Name string
TagId uint16
Index int
}
// String returns a descriptive string.
func (itii IfdTagIdAndIndex) String() string {
return fmt.Sprintf("IfdTagIdAndIndex<NAME=[%s] ID=(%04x) INDEX=(%d)>", itii.Name, itii.TagId, itii.Index)
}
// ResolvePath takes a list of names, which can also be suffixed with indices
// (to identify the second, third, etc.. sibling IFD) and returns a list of
// tag-IDs and those indices.
//
// Example:
//
// - IFD/Exif/Iop
// - IFD0/Exif/Iop
//
// This is the only call that supports adding the numeric indices.
func (im *IfdMapping) ResolvePath(pathPhrase string) (lineage []IfdTagIdAndIndex, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
pathPhrase = strings.TrimSpace(pathPhrase)
if pathPhrase == "" {
log.Panicf("can not resolve empty path-phrase")
}
path := strings.Split(pathPhrase, "/")
lineage = make([]IfdTagIdAndIndex, len(path))
ptr := im.rootNode
empty := IfdTagIdAndIndex{}
for i, name := range path {
indexByte := name[len(name)-1]
index := 0
if indexByte >= '0' && indexByte <= '9' {
index = int(indexByte - '0')
name = name[:len(name)-1]
}
itii := IfdTagIdAndIndex{}
for _, mi := range ptr.Children {
if mi.Name != name {
continue
}
itii.Name = name
itii.TagId = mi.TagId
itii.Index = index
ptr = mi
break
}
if itii == empty {
log.Panicf("ifd child with name [%s] not registered: [%s]", name, pathPhrase)
}
lineage[i] = itii
}
return lineage, nil
}
// FqPathPhraseFromLineage returns the fully-qualified IFD path from the slice.
func (im *IfdMapping) FqPathPhraseFromLineage(lineage []IfdTagIdAndIndex) (fqPathPhrase string) {
fqPathParts := make([]string, len(lineage))
for i, itii := range lineage {
if itii.Index > 0 {
fqPathParts[i] = fmt.Sprintf("%s%d", itii.Name, itii.Index)
} else {
fqPathParts[i] = itii.Name
}
}
return strings.Join(fqPathParts, "/")
}
// PathPhraseFromLineage returns the non-fully-qualified IFD path from the
// slice.
func (im *IfdMapping) PathPhraseFromLineage(lineage []IfdTagIdAndIndex) (pathPhrase string) {
pathParts := make([]string, len(lineage))
for i, itii := range lineage {
pathParts[i] = itii.Name
}
return strings.Join(pathParts, "/")
}
// StripPathPhraseIndices returns a non-fully-qualified path-phrase (no
// indices).
func (im *IfdMapping) StripPathPhraseIndices(pathPhrase string) (strippedPathPhrase string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
lineage, err := im.ResolvePath(pathPhrase)
log.PanicIf(err)
strippedPathPhrase = im.PathPhraseFromLineage(lineage)
return strippedPathPhrase, nil
}
// Add puts the given IFD at the given position of the tree. The position of the
// tree is referred to as the placement and is represented by a set of tag-IDs,
// where the leftmost is the root tag and the tags going to the right are
// progressive descendants.
func (im *IfdMapping) Add(parentPlacement []uint16, tagId uint16, name string) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): !! It would be nicer to provide a list of names in the placement rather than tag-IDs.
ptr, err := im.Get(parentPlacement)
log.PanicIf(err)
path := make([]string, len(parentPlacement)+1)
if len(parentPlacement) > 0 {
copy(path, ptr.Path)
}
path[len(path)-1] = name
placement := make([]uint16, len(parentPlacement)+1)
if len(placement) > 0 {
copy(placement, ptr.Placement)
}
placement[len(placement)-1] = tagId
childIfd := &MappedIfd{
ParentTagId: ptr.TagId,
Path: path,
Placement: placement,
Name: name,
TagId: tagId,
Children: make(map[uint16]*MappedIfd),
}
if _, found := ptr.Children[tagId]; found == true {
log.Panicf("child IFD with tag-ID (%04x) already registered under IFD [%s] with tag-ID (%04x)", tagId, ptr.Name, ptr.TagId)
}
ptr.Children[tagId] = childIfd
return nil
}
func (im *IfdMapping) dumpLineages(stack []*MappedIfd, input []string) (output []string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
currentIfd := stack[len(stack)-1]
output = input
for _, childIfd := range currentIfd.Children {
stackCopy := make([]*MappedIfd, len(stack)+1)
copy(stackCopy, stack)
stackCopy[len(stack)] = childIfd
// Add to output, but don't include the obligatory root node.
parts := make([]string, len(stackCopy)-1)
for i, mi := range stackCopy[1:] {
parts[i] = mi.Name
}
output = append(output, strings.Join(parts, "/"))
output, err = im.dumpLineages(stackCopy, output)
log.PanicIf(err)
}
return output, nil
}
// DumpLineages returns a slice of strings representing all mappings.
func (im *IfdMapping) DumpLineages() (output []string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
stack := []*MappedIfd{im.rootNode}
output = make([]string, 0)
output, err = im.dumpLineages(stack, output)
log.PanicIf(err)
return output, nil
}
// LoadStandardIfds loads the standard IFDs into the mapping.
func LoadStandardIfds(im *IfdMapping) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
err = im.Add(
[]uint16{},
IfdStandardIfdIdentity.TagId(), IfdStandardIfdIdentity.Name())
log.PanicIf(err)
err = im.Add(
[]uint16{IfdStandardIfdIdentity.TagId()},
IfdExifStandardIfdIdentity.TagId(), IfdExifStandardIfdIdentity.Name())
log.PanicIf(err)
err = im.Add(
[]uint16{IfdStandardIfdIdentity.TagId(), IfdExifStandardIfdIdentity.TagId()},
IfdExifIopStandardIfdIdentity.TagId(), IfdExifIopStandardIfdIdentity.Name())
log.PanicIf(err)
err = im.Add(
[]uint16{IfdStandardIfdIdentity.TagId()},
IfdGpsInfoStandardIfdIdentity.TagId(), IfdGpsInfoStandardIfdIdentity.Name())
log.PanicIf(err)
return nil
}
// IfdTag describes a single IFD tag and its parent (if any).
type IfdTag struct {
parentIfdTag *IfdTag
tagId uint16
name string
}
func NewIfdTag(parentIfdTag *IfdTag, tagId uint16, name string) IfdTag {
return IfdTag{
parentIfdTag: parentIfdTag,
tagId: tagId,
name: name,
}
}
// ParentIfd returns the IfdTag of this IFD's parent.
func (it IfdTag) ParentIfd() *IfdTag {
return it.parentIfdTag
}
// TagId returns the tag-ID of this IFD.
func (it IfdTag) TagId() uint16 {
return it.tagId
}
// Name returns the simple name of this IFD.
func (it IfdTag) Name() string {
return it.name
}
// String returns a descriptive string.
func (it IfdTag) String() string {
parentIfdPhrase := ""
if it.parentIfdTag != nil {
parentIfdPhrase = fmt.Sprintf(" PARENT=(0x%04x)[%s]", it.parentIfdTag.tagId, it.parentIfdTag.name)
}
return fmt.Sprintf("IfdTag<TAG-ID=(0x%04x) NAME=[%s]%s>", it.tagId, it.name, parentIfdPhrase)
}
var (
// rootStandardIfd is the standard root IFD.
rootStandardIfd = NewIfdTag(nil, 0x0000, "IFD") // IFD
// exifStandardIfd is the standard "Exif" IFD.
exifStandardIfd = NewIfdTag(&rootStandardIfd, 0x8769, "Exif") // IFD/Exif
// iopStandardIfd is the standard "Iop" IFD.
iopStandardIfd = NewIfdTag(&exifStandardIfd, 0xA005, "Iop") // IFD/Exif/Iop
// gpsInfoStandardIfd is the standard "GPS" IFD.
gpsInfoStandardIfd = NewIfdTag(&rootStandardIfd, 0x8825, "GPSInfo") // IFD/GPSInfo
)
// IfdIdentityPart represents one component in an IFD path.
type IfdIdentityPart struct {
Name string
Index int
}
// String returns a fully-qualified IFD path.
func (iip IfdIdentityPart) String() string {
if iip.Index > 0 {
return fmt.Sprintf("%s%d", iip.Name, iip.Index)
} else {
return iip.Name
}
}
// UnindexedString returned a non-fully-qualified IFD path.
func (iip IfdIdentityPart) UnindexedString() string {
return iip.Name
}
// IfdIdentity represents a single IFD path and provides access to various
// information and representations.
//
// Only global instances can be used for equality checks.
type IfdIdentity struct {
ifdTag IfdTag
parts []IfdIdentityPart
ifdPath string
fqIfdPath string
}
// NewIfdIdentity returns a new IfdIdentity struct.
func NewIfdIdentity(ifdTag IfdTag, parts ...IfdIdentityPart) (ii *IfdIdentity) {
ii = &IfdIdentity{
ifdTag: ifdTag,
parts: parts,
}
ii.ifdPath = ii.getIfdPath()
ii.fqIfdPath = ii.getFqIfdPath()
return ii
}
// NewIfdIdentityFromString parses a string like "IFD/Exif" or "IFD1" or
// something more exotic with custom IFDs ("SomeIFD4/SomeChildIFD6"). Note that
// this will valid the unindexed IFD structure (because the standard tags from
// the specification are unindexed), but not, obviously, any indices (e.g.
// the numbers in "IFD0", "IFD1", "SomeIFD4/SomeChildIFD6"). It is
// required for the caller to check whether these specific instances
// were actually parsed out of the stream.
func NewIfdIdentityFromString(im *IfdMapping, fqIfdPath string) (ii *IfdIdentity, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
lineage, err := im.ResolvePath(fqIfdPath)
log.PanicIf(err)
var lastIt *IfdTag
identityParts := make([]IfdIdentityPart, len(lineage))
for i, itii := range lineage {
// Build out the tag that will eventually point to the IFD represented
// by the right-most part in the IFD path.
it := &IfdTag{
parentIfdTag: lastIt,
tagId: itii.TagId,
name: itii.Name,
}
lastIt = it
// Create the next IfdIdentity part.
iip := IfdIdentityPart{
Name: itii.Name,
Index: itii.Index,
}
identityParts[i] = iip
}
ii = NewIfdIdentity(*lastIt, identityParts...)
return ii, nil
}
func (ii *IfdIdentity) getFqIfdPath() string {
partPhrases := make([]string, len(ii.parts))
for i, iip := range ii.parts {
partPhrases[i] = iip.String()
}
return strings.Join(partPhrases, "/")
}
func (ii *IfdIdentity) getIfdPath() string {
partPhrases := make([]string, len(ii.parts))
for i, iip := range ii.parts {
partPhrases[i] = iip.UnindexedString()
}
return strings.Join(partPhrases, "/")
}
// String returns a fully-qualified IFD path.
func (ii *IfdIdentity) String() string {
return ii.fqIfdPath
}
// UnindexedString returns a non-fully-qualified IFD path.
func (ii *IfdIdentity) UnindexedString() string {
return ii.ifdPath
}
// IfdTag returns the tag struct behind this IFD.
func (ii *IfdIdentity) IfdTag() IfdTag {
return ii.ifdTag
}
// TagId returns the tag-ID of the IFD.
func (ii *IfdIdentity) TagId() uint16 {
return ii.ifdTag.TagId()
}
// LeafPathPart returns the last right-most path-part, which represents the
// current IFD.
func (ii *IfdIdentity) LeafPathPart() IfdIdentityPart {
return ii.parts[len(ii.parts)-1]
}
// Name returns the simple name of this IFD.
func (ii *IfdIdentity) Name() string {
return ii.LeafPathPart().Name
}
// Index returns the index of this IFD (more then one IFD under a parent IFD
// will be numbered [0..n]).
func (ii *IfdIdentity) Index() int {
return ii.LeafPathPart().Index
}
// Equals returns true if the two IfdIdentity instances are effectively
// identical.
//
// Since there's no way to get a specific fully-qualified IFD path without a
// certain slice of parts and all other fields are also derived from this,
// checking that the fully-qualified IFD path is equals is sufficient.
func (ii *IfdIdentity) Equals(ii2 *IfdIdentity) bool {
return ii.String() == ii2.String()
}
// NewChild creates an IfdIdentity for an IFD that is a child of the current
// IFD.
func (ii *IfdIdentity) NewChild(childIfdTag IfdTag, index int) (iiChild *IfdIdentity) {
if *childIfdTag.parentIfdTag != ii.ifdTag {
log.Panicf("can not add child; we are not the parent:\nUS=%v\nCHILD=%v", ii.ifdTag, childIfdTag)
}
childPart := IfdIdentityPart{childIfdTag.name, index}
childParts := append(ii.parts, childPart)
iiChild = NewIfdIdentity(childIfdTag, childParts...)
return iiChild
}
// NewSibling creates an IfdIdentity for an IFD that is a sibling to the current
// one.
func (ii *IfdIdentity) NewSibling(index int) (iiSibling *IfdIdentity) {
parts := make([]IfdIdentityPart, len(ii.parts))
copy(parts, ii.parts)
parts[len(parts)-1].Index = index
iiSibling = NewIfdIdentity(ii.ifdTag, parts...)
return iiSibling
}
var (
// IfdStandardIfdIdentity represents the IFD path for IFD0.
IfdStandardIfdIdentity = NewIfdIdentity(rootStandardIfd, IfdIdentityPart{"IFD", 0})
// IfdExifStandardIfdIdentity represents the IFD path for IFD0/Exif0.
IfdExifStandardIfdIdentity = IfdStandardIfdIdentity.NewChild(exifStandardIfd, 0)
// IfdExifIopStandardIfdIdentity represents the IFD path for IFD0/Exif0/Iop0.
IfdExifIopStandardIfdIdentity = IfdExifStandardIfdIdentity.NewChild(iopStandardIfd, 0)
// IfdGPSInfoStandardIfdIdentity represents the IFD path for IFD0/GPSInfo0.
IfdGpsInfoStandardIfdIdentity = IfdStandardIfdIdentity.NewChild(gpsInfoStandardIfd, 0)
// Ifd1StandardIfdIdentity represents the IFD path for IFD1.
Ifd1StandardIfdIdentity = NewIfdIdentity(rootStandardIfd, IfdIdentityPart{"IFD", 1})
)
var (
IfdPathStandard = IfdStandardIfdIdentity
IfdPathStandardExif = IfdExifStandardIfdIdentity
IfdPathStandardExifIop = IfdExifIopStandardIfdIdentity
IfdPathStandardGps = IfdGpsInfoStandardIfdIdentity
)

219
vendor/github.com/dsoprea/go-exif/v2/common/parser.go generated vendored Normal file
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package exifcommon
import (
"bytes"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
var (
parserLogger = log.NewLogger("exifcommon.parser")
)
// Parser knows how to parse all well-defined, encoded EXIF types.
type Parser struct {
}
// ParseBytesknows how to parse a byte-type value.
func (p *Parser) ParseBytes(data []byte, unitCount uint32) (value []uint8, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): Add test
count := int(unitCount)
if len(data) < (TypeByte.Size() * count) {
log.Panic(ErrNotEnoughData)
}
value = []uint8(data[:count])
return value, nil
}
// ParseAscii returns a string and auto-strips the trailing NUL character that
// should be at the end of the encoding.
func (p *Parser) ParseAscii(data []byte, unitCount uint32) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): Add test
count := int(unitCount)
if len(data) < (TypeAscii.Size() * count) {
log.Panic(ErrNotEnoughData)
}
if len(data) == 0 || data[count-1] != 0 {
s := string(data[:count])
parserLogger.Warningf(nil, "ascii not terminated with nul as expected: [%v]", s)
return s, nil
}
// Auto-strip the NUL from the end. It serves no purpose outside of
// encoding semantics.
return string(data[:count-1]), nil
}
// ParseAsciiNoNul returns a string without any consideration for a trailing NUL
// character.
func (p *Parser) ParseAsciiNoNul(data []byte, unitCount uint32) (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): Add test
count := int(unitCount)
if len(data) < (TypeAscii.Size() * count) {
log.Panic(ErrNotEnoughData)
}
return string(data[:count]), nil
}
// ParseShorts knows how to parse an encoded list of shorts.
func (p *Parser) ParseShorts(data []byte, unitCount uint32, byteOrder binary.ByteOrder) (value []uint16, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): Add test
count := int(unitCount)
if len(data) < (TypeShort.Size() * count) {
log.Panic(ErrNotEnoughData)
}
value = make([]uint16, count)
for i := 0; i < count; i++ {
value[i] = byteOrder.Uint16(data[i*2:])
}
return value, nil
}
// ParseLongs knows how to encode an encoded list of unsigned longs.
func (p *Parser) ParseLongs(data []byte, unitCount uint32, byteOrder binary.ByteOrder) (value []uint32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): Add test
count := int(unitCount)
if len(data) < (TypeLong.Size() * count) {
log.Panic(ErrNotEnoughData)
}
value = make([]uint32, count)
for i := 0; i < count; i++ {
value[i] = byteOrder.Uint32(data[i*4:])
}
return value, nil
}
// ParseRationals knows how to parse an encoded list of unsigned rationals.
func (p *Parser) ParseRationals(data []byte, unitCount uint32, byteOrder binary.ByteOrder) (value []Rational, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): Add test
count := int(unitCount)
if len(data) < (TypeRational.Size() * count) {
log.Panic(ErrNotEnoughData)
}
value = make([]Rational, count)
for i := 0; i < count; i++ {
value[i].Numerator = byteOrder.Uint32(data[i*8:])
value[i].Denominator = byteOrder.Uint32(data[i*8+4:])
}
return value, nil
}
// ParseSignedLongs knows how to parse an encoded list of signed longs.
func (p *Parser) ParseSignedLongs(data []byte, unitCount uint32, byteOrder binary.ByteOrder) (value []int32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): Add test
count := int(unitCount)
if len(data) < (TypeSignedLong.Size() * count) {
log.Panic(ErrNotEnoughData)
}
b := bytes.NewBuffer(data)
value = make([]int32, count)
for i := 0; i < count; i++ {
err := binary.Read(b, byteOrder, &value[i])
log.PanicIf(err)
}
return value, nil
}
// ParseSignedRationals knows how to parse an encoded list of signed
// rationals.
func (p *Parser) ParseSignedRationals(data []byte, unitCount uint32, byteOrder binary.ByteOrder) (value []SignedRational, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): Add test
count := int(unitCount)
if len(data) < (TypeSignedRational.Size() * count) {
log.Panic(ErrNotEnoughData)
}
b := bytes.NewBuffer(data)
value = make([]SignedRational, count)
for i := 0; i < count; i++ {
err = binary.Read(b, byteOrder, &value[i].Numerator)
log.PanicIf(err)
err = binary.Read(b, byteOrder, &value[i].Denominator)
log.PanicIf(err)
}
return value, nil
}

88
vendor/github.com/dsoprea/go-exif/v2/common/testing_common.go generated vendored Normal file
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package exifcommon
import (
"os"
"path"
"encoding/binary"
"io/ioutil"
"github.com/dsoprea/go-logging"
)
var (
moduleRootPath = ""
testExifData []byte = nil
// EncodeDefaultByteOrder is the default byte-order for encoding operations.
EncodeDefaultByteOrder = binary.BigEndian
// Default byte order for tests.
TestDefaultByteOrder = binary.BigEndian
)
func GetModuleRootPath() string {
if moduleRootPath == "" {
moduleRootPath = os.Getenv("EXIF_MODULE_ROOT_PATH")
if moduleRootPath != "" {
return moduleRootPath
}
currentWd, err := os.Getwd()
log.PanicIf(err)
currentPath := currentWd
visited := make([]string, 0)
for {
tryStampFilepath := path.Join(currentPath, ".MODULE_ROOT")
_, err := os.Stat(tryStampFilepath)
if err != nil && os.IsNotExist(err) != true {
log.Panic(err)
} else if err == nil {
break
}
visited = append(visited, tryStampFilepath)
currentPath = path.Dir(currentPath)
if currentPath == "/" {
log.Panicf("could not find module-root: %v", visited)
}
}
moduleRootPath = currentPath
}
return moduleRootPath
}
func GetTestAssetsPath() string {
moduleRootPath := GetModuleRootPath()
assetsPath := path.Join(moduleRootPath, "assets")
return assetsPath
}
func getTestImageFilepath() string {
assetsPath := GetTestAssetsPath()
testImageFilepath := path.Join(assetsPath, "NDM_8901.jpg")
return testImageFilepath
}
func getTestExifData() []byte {
if testExifData == nil {
assetsPath := GetTestAssetsPath()
filepath := path.Join(assetsPath, "NDM_8901.jpg.exif")
var err error
testExifData, err = ioutil.ReadFile(filepath)
log.PanicIf(err)
}
return testExifData
}

452
vendor/github.com/dsoprea/go-exif/v2/common/type.go generated vendored Normal file
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package exifcommon
import (
"errors"
"fmt"
"reflect"
"strconv"
"strings"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
var (
typeLogger = log.NewLogger("exif.type")
)
var (
// ErrNotEnoughData is used when there isn't enough data to accommodate what
// we're trying to parse (sizeof(type) * unit_count).
ErrNotEnoughData = errors.New("not enough data for type")
// ErrWrongType is used when we try to parse anything other than the
// current type.
ErrWrongType = errors.New("wrong type, can not parse")
// ErrUnhandledUndefinedTypedTag is used when we try to parse a tag that's
// recorded as an "unknown" type but not a documented tag (therefore
// leaving us not knowning how to read it).
ErrUnhandledUndefinedTypedTag = errors.New("not a standard unknown-typed tag")
)
// TagTypePrimitive is a type-alias that let's us easily lookup type properties.
type TagTypePrimitive uint16
const (
// TypeByte describes an encoded list of bytes.
TypeByte TagTypePrimitive = 1
// TypeAscii describes an encoded list of characters that is terminated
// with a NUL in its encoded form.
TypeAscii TagTypePrimitive = 2
// TypeShort describes an encoded list of shorts.
TypeShort TagTypePrimitive = 3
// TypeLong describes an encoded list of longs.
TypeLong TagTypePrimitive = 4
// TypeRational describes an encoded list of rationals.
TypeRational TagTypePrimitive = 5
// TypeUndefined describes an encoded value that has a complex/non-clearcut
// interpretation.
TypeUndefined TagTypePrimitive = 7
// We've seen type-8, but have no documentation on it.
// TypeSignedLong describes an encoded list of signed longs.
TypeSignedLong TagTypePrimitive = 9
// TypeSignedRational describes an encoded list of signed rationals.
TypeSignedRational TagTypePrimitive = 10
// TypeAsciiNoNul is just a pseudo-type, for our own purposes.
TypeAsciiNoNul TagTypePrimitive = 0xf0
)
// String returns the name of the type
func (typeType TagTypePrimitive) String() string {
return TypeNames[typeType]
}
// Size returns the size of one atomic unit of the type.
func (tagType TagTypePrimitive) Size() int {
if tagType == TypeByte {
return 1
} else if tagType == TypeAscii || tagType == TypeAsciiNoNul {
return 1
} else if tagType == TypeShort {
return 2
} else if tagType == TypeLong {
return 4
} else if tagType == TypeRational {
return 8
} else if tagType == TypeSignedLong {
return 4
} else if tagType == TypeSignedRational {
return 8
} else {
log.Panicf("can not determine tag-value size for type (%d): [%s]", tagType, TypeNames[tagType])
// Never called.
return 0
}
}
// IsValid returns true if tagType is a valid type.
func (tagType TagTypePrimitive) IsValid() bool {
// TODO(dustin): Add test
return tagType == TypeByte ||
tagType == TypeAscii ||
tagType == TypeAsciiNoNul ||
tagType == TypeShort ||
tagType == TypeLong ||
tagType == TypeRational ||
tagType == TypeSignedLong ||
tagType == TypeSignedRational ||
tagType == TypeUndefined
}
var (
// TODO(dustin): Rename TypeNames() to typeNames() and add getter.
TypeNames = map[TagTypePrimitive]string{
TypeByte: "BYTE",
TypeAscii: "ASCII",
TypeShort: "SHORT",
TypeLong: "LONG",
TypeRational: "RATIONAL",
TypeUndefined: "UNDEFINED",
TypeSignedLong: "SLONG",
TypeSignedRational: "SRATIONAL",
TypeAsciiNoNul: "_ASCII_NO_NUL",
}
typeNamesR = map[string]TagTypePrimitive{}
)
// Rational describes an unsigned rational value.
type Rational struct {
// Numerator is the numerator of the rational value.
Numerator uint32
// Denominator is the numerator of the rational value.
Denominator uint32
}
// SignedRational describes a signed rational value.
type SignedRational struct {
// Numerator is the numerator of the rational value.
Numerator int32
// Denominator is the numerator of the rational value.
Denominator int32
}
// Format returns a stringified value for the given encoding. Automatically
// parses. Automatically calculates count based on type size. This function
// also supports undefined-type values (the ones that we support, anyway) by
// way of the String() method that they all require. We can't be more specific
// because we're a base package and we can't refer to it.
func FormatFromType(value interface{}, justFirst bool) (phrase string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): !! Add test
switch t := value.(type) {
case []byte:
return DumpBytesToString(t), nil
case string:
return t, nil
case []uint16:
if len(t) == 0 {
return "", nil
}
if justFirst == true {
var valueSuffix string
if len(t) > 1 {
valueSuffix = "..."
}
return fmt.Sprintf("%v%s", t[0], valueSuffix), nil
}
return fmt.Sprintf("%v", t), nil
case []uint32:
if len(t) == 0 {
return "", nil
}
if justFirst == true {
var valueSuffix string
if len(t) > 1 {
valueSuffix = "..."
}
return fmt.Sprintf("%v%s", t[0], valueSuffix), nil
}
return fmt.Sprintf("%v", t), nil
case []Rational:
if len(t) == 0 {
return "", nil
}
parts := make([]string, len(t))
for i, r := range t {
parts[i] = fmt.Sprintf("%d/%d", r.Numerator, r.Denominator)
if justFirst == true {
break
}
}
if justFirst == true {
var valueSuffix string
if len(t) > 1 {
valueSuffix = "..."
}
return fmt.Sprintf("%v%s", parts[0], valueSuffix), nil
}
return fmt.Sprintf("%v", parts), nil
case []int32:
if len(t) == 0 {
return "", nil
}
if justFirst == true {
var valueSuffix string
if len(t) > 1 {
valueSuffix = "..."
}
return fmt.Sprintf("%v%s", t[0], valueSuffix), nil
}
return fmt.Sprintf("%v", t), nil
case []SignedRational:
if len(t) == 0 {
return "", nil
}
parts := make([]string, len(t))
for i, r := range t {
parts[i] = fmt.Sprintf("%d/%d", r.Numerator, r.Denominator)
if justFirst == true {
break
}
}
if justFirst == true {
var valueSuffix string
if len(t) > 1 {
valueSuffix = "..."
}
return fmt.Sprintf("%v%s", parts[0], valueSuffix), nil
}
return fmt.Sprintf("%v", parts), nil
case fmt.Stringer:
// An undefined value that is documented (or that we otherwise support).
return t.String(), nil
default:
// Affects only "unknown" values, in general.
log.Panicf("type can not be formatted into string: %v", reflect.TypeOf(value).Name())
// Never called.
return "", nil
}
}
// Format returns a stringified value for the given encoding. Automatically
// parses. Automatically calculates count based on type size.
func FormatFromBytes(rawBytes []byte, tagType TagTypePrimitive, justFirst bool, byteOrder binary.ByteOrder) (phrase string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// TODO(dustin): !! Add test
typeSize := tagType.Size()
if len(rawBytes)%typeSize != 0 {
log.Panicf("byte-count (%d) does not align for [%s] type with a size of (%d) bytes", len(rawBytes), TypeNames[tagType], typeSize)
}
// unitCount is the calculated unit-count. This should equal the original
// value from the tag (pre-resolution).
unitCount := uint32(len(rawBytes) / typeSize)
// Truncate the items if it's not bytes or a string and we just want the first.
var value interface{}
switch tagType {
case TypeByte:
var err error
value, err = parser.ParseBytes(rawBytes, unitCount)
log.PanicIf(err)
case TypeAscii:
var err error
value, err = parser.ParseAscii(rawBytes, unitCount)
log.PanicIf(err)
case TypeAsciiNoNul:
var err error
value, err = parser.ParseAsciiNoNul(rawBytes, unitCount)
log.PanicIf(err)
case TypeShort:
var err error
value, err = parser.ParseShorts(rawBytes, unitCount, byteOrder)
log.PanicIf(err)
case TypeLong:
var err error
value, err = parser.ParseLongs(rawBytes, unitCount, byteOrder)
log.PanicIf(err)
case TypeRational:
var err error
value, err = parser.ParseRationals(rawBytes, unitCount, byteOrder)
log.PanicIf(err)
case TypeSignedLong:
var err error
value, err = parser.ParseSignedLongs(rawBytes, unitCount, byteOrder)
log.PanicIf(err)
case TypeSignedRational:
var err error
value, err = parser.ParseSignedRationals(rawBytes, unitCount, byteOrder)
log.PanicIf(err)
default:
// Affects only "unknown" values, in general.
log.Panicf("value of type [%s] can not be formatted into string", tagType.String())
// Never called.
return "", nil
}
phrase, err = FormatFromType(value, justFirst)
log.PanicIf(err)
return phrase, nil
}
// TranslateStringToType converts user-provided strings to properly-typed
// values. If a string, returns a string. Else, assumes that it's a single
// number. If a list needs to be processed, it is the caller's responsibility to
// split it (according to whichever convention has been established).
func TranslateStringToType(tagType TagTypePrimitive, valueString string) (value interface{}, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
if tagType == TypeUndefined {
// The caller should just call String() on the decoded type.
log.Panicf("undefined-type values are not supported")
}
if tagType == TypeByte {
wide, err := strconv.ParseInt(valueString, 16, 8)
log.PanicIf(err)
return byte(wide), nil
} else if tagType == TypeAscii || tagType == TypeAsciiNoNul {
// Whether or not we're putting an NUL on the end is only relevant for
// byte-level encoding. This function really just supports a user
// interface.
return valueString, nil
} else if tagType == TypeShort {
n, err := strconv.ParseUint(valueString, 10, 16)
log.PanicIf(err)
return uint16(n), nil
} else if tagType == TypeLong {
n, err := strconv.ParseUint(valueString, 10, 32)
log.PanicIf(err)
return uint32(n), nil
} else if tagType == TypeRational {
parts := strings.SplitN(valueString, "/", 2)
numerator, err := strconv.ParseUint(parts[0], 10, 32)
log.PanicIf(err)
denominator, err := strconv.ParseUint(parts[1], 10, 32)
log.PanicIf(err)
return Rational{
Numerator: uint32(numerator),
Denominator: uint32(denominator),
}, nil
} else if tagType == TypeSignedLong {
n, err := strconv.ParseInt(valueString, 10, 32)
log.PanicIf(err)
return int32(n), nil
} else if tagType == TypeSignedRational {
parts := strings.SplitN(valueString, "/", 2)
numerator, err := strconv.ParseInt(parts[0], 10, 32)
log.PanicIf(err)
denominator, err := strconv.ParseInt(parts[1], 10, 32)
log.PanicIf(err)
return SignedRational{
Numerator: int32(numerator),
Denominator: int32(denominator),
}, nil
}
log.Panicf("from-string encoding for type not supported; this shouldn't happen: [%s]", tagType.String())
return nil, nil
}
// GetTypeByName returns the `TagTypePrimitive` for the given type name.
// Returns (0) if not valid.
func GetTypeByName(typeName string) (tagType TagTypePrimitive, found bool) {
tagType, found = typeNamesR[typeName]
return tagType, found
}
// BasicTag describes a single tag for any purpose.
type BasicTag struct {
// FqIfdPath is the fully-qualified IFD-path.
FqIfdPath string
// IfdPath is the unindexed IFD-path.
IfdPath string
// TagId is the tag-ID.
TagId uint16
}
func init() {
for typeId, typeName := range TypeNames {
typeNamesR[typeName] = typeId
}
}

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vendor/github.com/dsoprea/go-exif/v2/common/utility.go generated vendored Normal file
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package exifcommon
import (
"bytes"
"fmt"
"time"
"github.com/dsoprea/go-logging"
)
// DumpBytes prints a list of hex-encoded bytes.
func DumpBytes(data []byte) {
fmt.Printf("DUMP: ")
for _, x := range data {
fmt.Printf("%02x ", x)
}
fmt.Printf("\n")
}
// DumpBytesClause prints a list like DumpBytes(), but encapsulated in
// "[]byte { ... }".
func DumpBytesClause(data []byte) {
fmt.Printf("DUMP: ")
fmt.Printf("[]byte { ")
for i, x := range data {
fmt.Printf("0x%02x", x)
if i < len(data)-1 {
fmt.Printf(", ")
}
}
fmt.Printf(" }\n")
}
// DumpBytesToString returns a stringified list of hex-encoded bytes.
func DumpBytesToString(data []byte) string {
b := new(bytes.Buffer)
for i, x := range data {
_, err := b.WriteString(fmt.Sprintf("%02x", x))
log.PanicIf(err)
if i < len(data)-1 {
_, err := b.WriteRune(' ')
log.PanicIf(err)
}
}
return b.String()
}
// DumpBytesClauseToString returns a comma-separated list of hex-encoded bytes.
func DumpBytesClauseToString(data []byte) string {
b := new(bytes.Buffer)
for i, x := range data {
_, err := b.WriteString(fmt.Sprintf("0x%02x", x))
log.PanicIf(err)
if i < len(data)-1 {
_, err := b.WriteString(", ")
log.PanicIf(err)
}
}
return b.String()
}
// ExifFullTimestampString produces a string like "2018:11:30 13:01:49" from a
// `time.Time` struct. It will attempt to convert to UTC first.
func ExifFullTimestampString(t time.Time) (fullTimestampPhrase string) {
t = t.UTC()
return fmt.Sprintf("%04d:%02d:%02d %02d:%02d:%02d", t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second())
}

412
vendor/github.com/dsoprea/go-exif/v2/common/value_context.go generated vendored Normal file
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package exifcommon
import (
"errors"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
var (
parser *Parser
)
var (
// ErrNotFarValue indicates that an offset-based lookup was attempted for a
// non-offset-based (embedded) value.
ErrNotFarValue = errors.New("not a far value")
)
// ValueContext embeds all of the parameters required to find and extract the
// actual tag value.
type ValueContext struct {
unitCount uint32
valueOffset uint32
rawValueOffset []byte
addressableData []byte
tagType TagTypePrimitive
byteOrder binary.ByteOrder
// undefinedValueTagType is the effective type to use if this is an
// "undefined" value.
undefinedValueTagType TagTypePrimitive
ifdPath string
tagId uint16
}
// TODO(dustin): We can update newValueContext() to derive `valueOffset` itself (from `rawValueOffset`).
// NewValueContext returns a new ValueContext struct.
func NewValueContext(ifdPath string, tagId uint16, unitCount, valueOffset uint32, rawValueOffset, addressableData []byte, tagType TagTypePrimitive, byteOrder binary.ByteOrder) *ValueContext {
return &ValueContext{
unitCount: unitCount,
valueOffset: valueOffset,
rawValueOffset: rawValueOffset,
addressableData: addressableData,
tagType: tagType,
byteOrder: byteOrder,
ifdPath: ifdPath,
tagId: tagId,
}
}
// SetUndefinedValueType sets the effective type if this is an unknown-type tag.
func (vc *ValueContext) SetUndefinedValueType(tagType TagTypePrimitive) {
if vc.tagType != TypeUndefined {
log.Panicf("can not set effective type for unknown-type tag because this is *not* an unknown-type tag")
}
vc.undefinedValueTagType = tagType
}
// UnitCount returns the embedded unit-count.
func (vc *ValueContext) UnitCount() uint32 {
return vc.unitCount
}
// ValueOffset returns the value-offset decoded as a `uint32`.
func (vc *ValueContext) ValueOffset() uint32 {
return vc.valueOffset
}
// RawValueOffset returns the uninterpreted value-offset. This is used for
// embedded values (values small enough to fit within the offset bytes rather
// than needing to be stored elsewhere and referred to by an actual offset).
func (vc *ValueContext) RawValueOffset() []byte {
return vc.rawValueOffset
}
// AddressableData returns the block of data that we can dereference into.
func (vc *ValueContext) AddressableData() []byte {
return vc.addressableData
}
// ByteOrder returns the byte-order of numbers.
func (vc *ValueContext) ByteOrder() binary.ByteOrder {
return vc.byteOrder
}
// IfdPath returns the path of the IFD containing this tag.
func (vc *ValueContext) IfdPath() string {
return vc.ifdPath
}
// TagId returns the ID of the tag that we represent.
func (vc *ValueContext) TagId() uint16 {
return vc.tagId
}
// isEmbedded returns whether the value is embedded or a reference. This can't
// be precalculated since the size is not defined for all types (namely the
// "undefined" types).
func (vc *ValueContext) isEmbedded() bool {
tagType := vc.effectiveValueType()
return (tagType.Size() * int(vc.unitCount)) <= 4
}
// SizeInBytes returns the number of bytes that this value requires. The
// underlying call will panic if the type is UNDEFINED. It is the
// responsibility of the caller to preemptively check that.
func (vc *ValueContext) SizeInBytes() int {
tagType := vc.effectiveValueType()
return tagType.Size() * int(vc.unitCount)
}
// effectiveValueType returns the effective type of the unknown-type tag or, if
// not unknown, the actual type.
func (vc *ValueContext) effectiveValueType() (tagType TagTypePrimitive) {
if vc.tagType == TypeUndefined {
tagType = vc.undefinedValueTagType
if tagType == 0 {
log.Panicf("undefined-value type not set")
}
} else {
tagType = vc.tagType
}
return tagType
}
// readRawEncoded returns the encoded bytes for the value that we represent.
func (vc *ValueContext) readRawEncoded() (rawBytes []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
tagType := vc.effectiveValueType()
unitSizeRaw := uint32(tagType.Size())
if vc.isEmbedded() == true {
byteLength := unitSizeRaw * vc.unitCount
return vc.rawValueOffset[:byteLength], nil
}
return vc.addressableData[vc.valueOffset : vc.valueOffset+vc.unitCount*unitSizeRaw], nil
}
// GetFarOffset returns the offset if the value is not embedded [within the
// pointer itself] or an error if an embedded value.
func (vc *ValueContext) GetFarOffset() (offset uint32, err error) {
if vc.isEmbedded() == true {
return 0, ErrNotFarValue
}
return vc.valueOffset, nil
}
// ReadRawEncoded returns the encoded bytes for the value that we represent.
func (vc *ValueContext) ReadRawEncoded() (rawBytes []byte, err error) {
// TODO(dustin): Remove this method and rename readRawEncoded in its place.
return vc.readRawEncoded()
}
// Format returns a string representation for the value.
//
// Where the type is not ASCII, `justFirst` indicates whether to just stringify
// the first item in the slice (or return an empty string if the slice is
// empty).
//
// Since this method lacks the information to process undefined-type tags (e.g.
// byte-order, tag-ID, IFD type), it will return an error if attempted. See
// `Undefined()`.
func (vc *ValueContext) Format() (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
rawBytes, err := vc.readRawEncoded()
log.PanicIf(err)
phrase, err := FormatFromBytes(rawBytes, vc.effectiveValueType(), false, vc.byteOrder)
log.PanicIf(err)
return phrase, nil
}
// FormatFirst is similar to `Format` but only gets and stringifies the first
// item.
func (vc *ValueContext) FormatFirst() (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
rawBytes, err := vc.readRawEncoded()
log.PanicIf(err)
phrase, err := FormatFromBytes(rawBytes, vc.tagType, true, vc.byteOrder)
log.PanicIf(err)
return phrase, nil
}
// ReadBytes parses the encoded byte-array from the value-context.
func (vc *ValueContext) ReadBytes() (value []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
rawValue, err := vc.readRawEncoded()
log.PanicIf(err)
value, err = parser.ParseBytes(rawValue, vc.unitCount)
log.PanicIf(err)
return value, nil
}
// ReadAscii parses the encoded NUL-terminated ASCII string from the value-
// context.
func (vc *ValueContext) ReadAscii() (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
rawValue, err := vc.readRawEncoded()
log.PanicIf(err)
value, err = parser.ParseAscii(rawValue, vc.unitCount)
log.PanicIf(err)
return value, nil
}
// ReadAsciiNoNul parses the non-NUL-terminated encoded ASCII string from the
// value-context.
func (vc *ValueContext) ReadAsciiNoNul() (value string, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
rawValue, err := vc.readRawEncoded()
log.PanicIf(err)
value, err = parser.ParseAsciiNoNul(rawValue, vc.unitCount)
log.PanicIf(err)
return value, nil
}
// ReadShorts parses the list of encoded shorts from the value-context.
func (vc *ValueContext) ReadShorts() (value []uint16, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
rawValue, err := vc.readRawEncoded()
log.PanicIf(err)
value, err = parser.ParseShorts(rawValue, vc.unitCount, vc.byteOrder)
log.PanicIf(err)
return value, nil
}
// ReadLongs parses the list of encoded, unsigned longs from the value-context.
func (vc *ValueContext) ReadLongs() (value []uint32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
rawValue, err := vc.readRawEncoded()
log.PanicIf(err)
value, err = parser.ParseLongs(rawValue, vc.unitCount, vc.byteOrder)
log.PanicIf(err)
return value, nil
}
// ReadRationals parses the list of encoded, unsigned rationals from the value-
// context.
func (vc *ValueContext) ReadRationals() (value []Rational, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
rawValue, err := vc.readRawEncoded()
log.PanicIf(err)
value, err = parser.ParseRationals(rawValue, vc.unitCount, vc.byteOrder)
log.PanicIf(err)
return value, nil
}
// ReadSignedLongs parses the list of encoded, signed longs from the value-context.
func (vc *ValueContext) ReadSignedLongs() (value []int32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
rawValue, err := vc.readRawEncoded()
log.PanicIf(err)
value, err = parser.ParseSignedLongs(rawValue, vc.unitCount, vc.byteOrder)
log.PanicIf(err)
return value, nil
}
// ReadSignedRationals parses the list of encoded, signed rationals from the
// value-context.
func (vc *ValueContext) ReadSignedRationals() (value []SignedRational, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
rawValue, err := vc.readRawEncoded()
log.PanicIf(err)
value, err = parser.ParseSignedRationals(rawValue, vc.unitCount, vc.byteOrder)
log.PanicIf(err)
return value, nil
}
// Values knows how to resolve the given value. This value is always a list
// (undefined-values aside), so we're named accordingly.
//
// Since this method lacks the information to process unknown-type tags (e.g.
// byte-order, tag-ID, IFD type), it will return an error if attempted. See
// `Undefined()`.
func (vc *ValueContext) Values() (values interface{}, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
if vc.tagType == TypeByte {
values, err = vc.ReadBytes()
log.PanicIf(err)
} else if vc.tagType == TypeAscii {
values, err = vc.ReadAscii()
log.PanicIf(err)
} else if vc.tagType == TypeAsciiNoNul {
values, err = vc.ReadAsciiNoNul()
log.PanicIf(err)
} else if vc.tagType == TypeShort {
values, err = vc.ReadShorts()
log.PanicIf(err)
} else if vc.tagType == TypeLong {
values, err = vc.ReadLongs()
log.PanicIf(err)
} else if vc.tagType == TypeRational {
values, err = vc.ReadRationals()
log.PanicIf(err)
} else if vc.tagType == TypeSignedLong {
values, err = vc.ReadSignedLongs()
log.PanicIf(err)
} else if vc.tagType == TypeSignedRational {
values, err = vc.ReadSignedRationals()
log.PanicIf(err)
} else if vc.tagType == TypeUndefined {
log.Panicf("will not parse undefined-type value")
// Never called.
return nil, nil
} else {
log.Panicf("value of type [%s] is unparseable", vc.tagType)
// Never called.
return nil, nil
}
return values, nil
}
func init() {
parser = new(Parser)
}

229
vendor/github.com/dsoprea/go-exif/v2/common/value_encoder.go generated vendored Normal file
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package exifcommon
import (
"bytes"
"reflect"
"time"
"encoding/binary"
"github.com/dsoprea/go-logging"
)
var (
typeEncodeLogger = log.NewLogger("exif.type_encode")
)
// EncodedData encapsulates the compound output of an encoding operation.
type EncodedData struct {
Type TagTypePrimitive
Encoded []byte
// TODO(dustin): Is this really necessary? We might have this just to correlate to the incoming stream format (raw bytes and a unit-count both for incoming and outgoing).
UnitCount uint32
}
// ValueEncoder knows how to encode values of every type to bytes.
type ValueEncoder struct {
byteOrder binary.ByteOrder
}
// NewValueEncoder returns a new ValueEncoder.
func NewValueEncoder(byteOrder binary.ByteOrder) *ValueEncoder {
return &ValueEncoder{
byteOrder: byteOrder,
}
}
func (ve *ValueEncoder) encodeBytes(value []uint8) (ed EncodedData, err error) {
ed.Type = TypeByte
ed.Encoded = []byte(value)
ed.UnitCount = uint32(len(value))
return ed, nil
}
func (ve *ValueEncoder) encodeAscii(value string) (ed EncodedData, err error) {
ed.Type = TypeAscii
ed.Encoded = []byte(value)
ed.Encoded = append(ed.Encoded, 0)
ed.UnitCount = uint32(len(ed.Encoded))
return ed, nil
}
// encodeAsciiNoNul returns a string encoded as a byte-string without a trailing
// NUL byte.
//
// Note that:
//
// 1. This type can not be automatically encoded using `Encode()`. The default
// mode is to encode *with* a trailing NUL byte using `encodeAscii`. Only
// certain undefined-type tags using an unterminated ASCII string and these
// are exceptional in nature.
//
// 2. The presence of this method allows us to completely test the complimentary
// no-nul parser.
//
func (ve *ValueEncoder) encodeAsciiNoNul(value string) (ed EncodedData, err error) {
ed.Type = TypeAsciiNoNul
ed.Encoded = []byte(value)
ed.UnitCount = uint32(len(ed.Encoded))
return ed, nil
}
func (ve *ValueEncoder) encodeShorts(value []uint16) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ed.UnitCount = uint32(len(value))
ed.Encoded = make([]byte, ed.UnitCount*2)
for i := uint32(0); i < ed.UnitCount; i++ {
ve.byteOrder.PutUint16(ed.Encoded[i*2:(i+1)*2], value[i])
}
ed.Type = TypeShort
return ed, nil
}
func (ve *ValueEncoder) encodeLongs(value []uint32) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ed.UnitCount = uint32(len(value))
ed.Encoded = make([]byte, ed.UnitCount*4)
for i := uint32(0); i < ed.UnitCount; i++ {
ve.byteOrder.PutUint32(ed.Encoded[i*4:(i+1)*4], value[i])
}
ed.Type = TypeLong
return ed, nil
}
func (ve *ValueEncoder) encodeRationals(value []Rational) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ed.UnitCount = uint32(len(value))
ed.Encoded = make([]byte, ed.UnitCount*8)
for i := uint32(0); i < ed.UnitCount; i++ {
ve.byteOrder.PutUint32(ed.Encoded[i*8+0:i*8+4], value[i].Numerator)
ve.byteOrder.PutUint32(ed.Encoded[i*8+4:i*8+8], value[i].Denominator)
}
ed.Type = TypeRational
return ed, nil
}
func (ve *ValueEncoder) encodeSignedLongs(value []int32) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ed.UnitCount = uint32(len(value))
b := bytes.NewBuffer(make([]byte, 0, 8*ed.UnitCount))
for i := uint32(0); i < ed.UnitCount; i++ {
err := binary.Write(b, ve.byteOrder, value[i])
log.PanicIf(err)
}
ed.Type = TypeSignedLong
ed.Encoded = b.Bytes()
return ed, nil
}
func (ve *ValueEncoder) encodeSignedRationals(value []SignedRational) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
ed.UnitCount = uint32(len(value))
b := bytes.NewBuffer(make([]byte, 0, 8*ed.UnitCount))
for i := uint32(0); i < ed.UnitCount; i++ {
err := binary.Write(b, ve.byteOrder, value[i].Numerator)
log.PanicIf(err)
err = binary.Write(b, ve.byteOrder, value[i].Denominator)
log.PanicIf(err)
}
ed.Type = TypeSignedRational
ed.Encoded = b.Bytes()
return ed, nil
}
// Encode returns bytes for the given value, infering type from the actual
// value. This does not support `TypeAsciiNoNull` (all strings are encoded as
// `TypeAscii`).
func (ve *ValueEncoder) Encode(value interface{}) (ed EncodedData, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
switch value.(type) {
case []byte:
ed, err = ve.encodeBytes(value.([]byte))
log.PanicIf(err)
case string:
ed, err = ve.encodeAscii(value.(string))
log.PanicIf(err)
case []uint16:
ed, err = ve.encodeShorts(value.([]uint16))
log.PanicIf(err)
case []uint32:
ed, err = ve.encodeLongs(value.([]uint32))
log.PanicIf(err)
case []Rational:
ed, err = ve.encodeRationals(value.([]Rational))
log.PanicIf(err)
case []int32:
ed, err = ve.encodeSignedLongs(value.([]int32))
log.PanicIf(err)
case []SignedRational:
ed, err = ve.encodeSignedRationals(value.([]SignedRational))
log.PanicIf(err)
case time.Time:
// For convenience, if the user doesn't want to deal with translation
// semantics with timestamps.
t := value.(time.Time)
s := ExifFullTimestampString(t)
ed, err = ve.encodeAscii(s)
log.PanicIf(err)
default:
log.Panicf("value not encodable: [%s] [%v]", reflect.TypeOf(value), value)
}
return ed, nil
}

14
vendor/github.com/dsoprea/go-exif/v2/error.go generated vendored Normal file
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package exif
import (
"errors"
)
var (
// ErrTagNotFound indicates that the tag was not found.
ErrTagNotFound = errors.New("tag not found")
// ErrTagNotKnown indicates that the tag is not registered with us as a
// known tag.
ErrTagNotKnown = errors.New("tag is not known")
)

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vendor/github.com/dsoprea/go-exif/v2/exif.go generated vendored Normal file
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package exif
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"os"
"encoding/binary"
"io/ioutil"
"github.com/dsoprea/go-logging"
"github.com/dsoprea/go-exif/v2/common"
)
const (
// ExifAddressableAreaStart is the absolute offset in the file that all
// offsets are relative to.
ExifAddressableAreaStart = uint32(0x0)
// ExifDefaultFirstIfdOffset is essentially the number of bytes in addition
// to `ExifAddressableAreaStart` that you have to move in order to escape
// the rest of the header and get to the earliest point where we can put
// stuff (which has to be the first IFD). This is the size of the header
// sequence containing the two-character byte-order, two-character fixed-
// bytes, and the four bytes describing the first-IFD offset.
ExifDefaultFirstIfdOffset = uint32(2 + 2 + 4)
)
const (
// ExifSignatureLength is the number of bytes in the EXIF signature (which
// customarily includes the first IFD offset).
ExifSignatureLength = 8
)
var (
exifLogger = log.NewLogger("exif.exif")
ExifBigEndianSignature = [4]byte{'M', 'M', 0x00, 0x2a}
ExifLittleEndianSignature = [4]byte{'I', 'I', 0x2a, 0x00}
)
var (
ErrNoExif = errors.New("no exif data")
ErrExifHeaderError = errors.New("exif header error")
)
// SearchAndExtractExif searches for an EXIF blob in the byte-slice.
func SearchAndExtractExif(data []byte) (rawExif []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
b := bytes.NewBuffer(data)
rawExif, err = SearchAndExtractExifWithReader(b)
if err != nil {
if err == ErrNoExif {
return nil, err
}
log.Panic(err)
}
return rawExif, nil
}
// SearchAndExtractExifWithReader searches for an EXIF blob using an
// `io.Reader`. We can't know how much long the EXIF data is without parsing it,
// so this will likely grab up a lot of the image-data, too.
func SearchAndExtractExifWithReader(r io.Reader) (rawExif []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// Search for the beginning of the EXIF information. The EXIF is near the
// beginning of most JPEGs, so this likely doesn't have a high cost (at
// least, again, with JPEGs).
br := bufio.NewReader(r)
discarded := 0
for {
window, err := br.Peek(ExifSignatureLength)
if err != nil {
if err == io.EOF {
return nil, ErrNoExif
}
log.Panic(err)
}
_, err = ParseExifHeader(window)
if err != nil {
if log.Is(err, ErrNoExif) == true {
// No EXIF. Move forward by one byte.
_, err := br.Discard(1)
log.PanicIf(err)
discarded++
continue
}
// Some other error.
log.Panic(err)
}
break
}
exifLogger.Debugf(nil, "Found EXIF blob (%d) bytes from initial position.", discarded)
rawExif, err = ioutil.ReadAll(br)
log.PanicIf(err)
return rawExif, nil
}
// SearchFileAndExtractExif returns a slice from the beginning of the EXIF data
// to the end of the file (it's not practical to try and calculate where the
// data actually ends).
func SearchFileAndExtractExif(filepath string) (rawExif []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// Open the file.
f, err := os.Open(filepath)
log.PanicIf(err)
defer f.Close()
rawExif, err = SearchAndExtractExifWithReader(f)
log.PanicIf(err)
return rawExif, nil
}
type ExifHeader struct {
ByteOrder binary.ByteOrder
FirstIfdOffset uint32
}
func (eh ExifHeader) String() string {
return fmt.Sprintf("ExifHeader<BYTE-ORDER=[%v] FIRST-IFD-OFFSET=(0x%02x)>", eh.ByteOrder, eh.FirstIfdOffset)
}
// ParseExifHeader parses the bytes at the very top of the header.
//
// This will panic with ErrNoExif on any data errors so that we can double as
// an EXIF-detection routine.
func ParseExifHeader(data []byte) (eh ExifHeader, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
// Good reference:
//
// CIPA DC-008-2016; JEITA CP-3451D
// -> http://www.cipa.jp/std/documents/e/DC-008-Translation-2016-E.pdf
if len(data) < ExifSignatureLength {
exifLogger.Warningf(nil, "Not enough data for EXIF header: (%d)", len(data))
return eh, ErrNoExif
}
if bytes.Equal(data[:4], ExifBigEndianSignature[:]) == true {
eh.ByteOrder = binary.BigEndian
} else if bytes.Equal(data[:4], ExifLittleEndianSignature[:]) == true {
eh.ByteOrder = binary.LittleEndian
} else {
return eh, ErrNoExif
}
eh.FirstIfdOffset = eh.ByteOrder.Uint32(data[4:8])
return eh, nil
}
// Visit recursively invokes a callback for every tag.
func Visit(rootIfdIdentity *exifcommon.IfdIdentity, ifdMapping *exifcommon.IfdMapping, tagIndex *TagIndex, exifData []byte, visitor TagVisitorFn) (eh ExifHeader, furthestOffset uint32, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
eh, err = ParseExifHeader(exifData)
log.PanicIf(err)
ie := NewIfdEnumerate(ifdMapping, tagIndex, exifData, eh.ByteOrder)
_, err = ie.Scan(rootIfdIdentity, eh.FirstIfdOffset, visitor)
log.PanicIf(err)
furthestOffset = ie.FurthestOffset()
return eh, furthestOffset, nil
}
// Collect recursively builds a static structure of all IFDs and tags.
func Collect(ifdMapping *exifcommon.IfdMapping, tagIndex *TagIndex, exifData []byte) (eh ExifHeader, index IfdIndex, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
eh, err = ParseExifHeader(exifData)
log.PanicIf(err)
ie := NewIfdEnumerate(ifdMapping, tagIndex, exifData, eh.ByteOrder)
index, err = ie.Collect(eh.FirstIfdOffset)
log.PanicIf(err)
return eh, index, nil
}
// BuildExifHeader constructs the bytes that go at the front of the stream.
func BuildExifHeader(byteOrder binary.ByteOrder, firstIfdOffset uint32) (headerBytes []byte, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
b := new(bytes.Buffer)
var signatureBytes []byte
if byteOrder == binary.BigEndian {
signatureBytes = ExifBigEndianSignature[:]
} else {
signatureBytes = ExifLittleEndianSignature[:]
}
_, err = b.Write(signatureBytes)
log.PanicIf(err)
err = binary.Write(b, byteOrder, firstIfdOffset)
log.PanicIf(err)
return b.Bytes(), nil
}

15
vendor/github.com/dsoprea/go-exif/v2/go.mod generated vendored Normal file
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module github.com/dsoprea/go-exif/v2
go 1.13
// Development only
// replace github.com/dsoprea/go-logging => ../../go-logging
require (
github.com/dsoprea/go-logging v0.0.0-20200517223158-a10564966e9d
github.com/dsoprea/go-utility v0.0.0-20200711062821-fab8125e9bdf // indirect
github.com/golang/geo v0.0.0-20200319012246-673a6f80352d
github.com/jessevdk/go-flags v1.4.0
golang.org/x/net v0.0.0-20200513185701-a91f0712d120 // indirect
gopkg.in/yaml.v2 v2.3.0
)

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