GoToSocial/internal/media/processingemoji.go

429 lines
14 KiB
Go

/*
GoToSocial
Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package media
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"sync"
"time"
"codeberg.org/gruf/go-bytesize"
gostore "codeberg.org/gruf/go-store/v2/storage"
"github.com/h2non/filetype"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/id"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/superseriousbusiness/gotosocial/internal/uris"
)
// ProcessingEmoji represents an emoji currently processing. It exposes
// various functions for retrieving data from the process.
type ProcessingEmoji struct {
instAccID string // instance account ID
emoji *gtsmodel.Emoji // processing emoji details
refresh bool // whether this is an existing emoji being refreshed
newPathID string // new emoji path ID to use if refreshed
dataFn DataFunc // load-data function, returns media stream
postFn PostDataCallbackFunc // post data callback function
err error // error encountered during processing
manager *manager // manager instance (access to db / storage)
once sync.Once // once ensures processing only occurs once
}
// EmojiID returns the ID of the underlying emoji without blocking processing.
func (p *ProcessingEmoji) EmojiID() string {
return p.emoji.ID // immutable, safe outside mutex.
}
// LoadEmoji blocks until the static and fullsize image
// has been processed, and then returns the completed emoji.
func (p *ProcessingEmoji) LoadEmoji(ctx context.Context) (*gtsmodel.Emoji, error) {
// only process once.
p.once.Do(func() {
var err error
defer func() {
if r := recover(); r != nil {
if err != nil {
rOld := r // wrap the panic so we don't lose existing returned error
r = fmt.Errorf("panic occured after error %q: %v", err.Error(), rOld)
}
// Catch any panics and wrap as error.
err = fmt.Errorf("caught panic: %v", r)
}
if err != nil {
// Store error.
p.err = err
}
}()
// Attempt to store media and calculate
// full-size media attachment details.
if err = p.store(ctx); err != nil {
return
}
// Finish processing by reloading media into
// memory to get dimension and generate a thumb.
if err = p.finish(ctx); err != nil {
return
}
if p.refresh {
columns := []string{
"updated_at",
"image_remote_url",
"image_static_remote_url",
"image_url",
"image_static_url",
"image_path",
"image_static_path",
"image_content_type",
"image_file_size",
"image_static_file_size",
"image_updated_at",
"shortcode",
"uri",
}
// Existing emoji we're refreshing, so only need to update.
_, err = p.manager.db.UpdateEmoji(ctx, p.emoji, columns...)
return
}
// New emoji media, first time caching.
err = p.manager.db.PutEmoji(ctx, p.emoji)
return //nolint shutup linter i like this here
})
if p.err != nil {
return nil, p.err
}
return p.emoji, nil
}
// store calls the data function attached to p if it hasn't been called yet,
// and updates the underlying attachment fields as necessary. It will then stream
// bytes from p's reader directly into storage so that it can be retrieved later.
func (p *ProcessingEmoji) store(ctx context.Context) error {
defer func() {
if p.postFn == nil {
return
}
// Ensure post callback gets called.
if err := p.postFn(ctx); err != nil {
log.Errorf("error executing postdata function: %v", err)
}
}()
// Load media from provided data fn.
rc, sz, err := p.dataFn(ctx)
if err != nil {
return fmt.Errorf("error executing data function: %w", err)
}
defer func() {
// Ensure data reader gets closed on return.
if err := rc.Close(); err != nil {
log.Errorf("error closing data reader: %v", err)
}
}()
// Byte buffer to read file header into.
// See: https://en.wikipedia.org/wiki/File_format#File_header
// and https://github.com/h2non/filetype
hdrBuf := make([]byte, 261)
// Read the first 261 header bytes into buffer.
if _, err := io.ReadFull(rc, hdrBuf); err != nil {
return fmt.Errorf("error reading incoming media: %w", err)
}
// Parse file type info from header buffer.
info, err := filetype.Match(hdrBuf)
if err != nil {
return fmt.Errorf("error parsing file type: %w", err)
}
switch info.Extension {
// only supported emoji types
case "gif", "png":
// unhandled
default:
return fmt.Errorf("unsupported emoji filetype: %s", info.Extension)
}
// Recombine header bytes with remaining stream
r := io.MultiReader(bytes.NewReader(hdrBuf), rc)
var maxSize bytesize.Size
if p.emoji.Domain == "" {
// this is a local emoji upload
maxSize = config.GetMediaEmojiLocalMaxSize()
} else {
// this is a remote incoming emoji
maxSize = config.GetMediaEmojiRemoteMaxSize()
}
// Check that provided size isn't beyond max. We check beforehand
// so that we don't attempt to stream the emoji into storage if not needed.
if size := bytesize.Size(sz); sz > 0 && size > maxSize {
return fmt.Errorf("given emoji size %s greater than max allowed %s", size, maxSize)
}
var pathID string
if p.refresh {
// This is a refreshed emoji with a new
// path ID that this will be stored under.
pathID = p.newPathID
} else {
// This is a new emoji, simply use provided ID.
pathID = p.emoji.ID
}
// Calculate emoji file path.
p.emoji.ImagePath = fmt.Sprintf(
"%s/%s/%s/%s.%s",
p.instAccID,
TypeEmoji,
SizeOriginal,
pathID,
info.Extension,
)
// This shouldn't already exist, but we do a check as it's worth logging.
if have, _ := p.manager.storage.Has(ctx, p.emoji.ImagePath); have {
log.Warnf("emoji already exists at storage path: %s", p.emoji.ImagePath)
// Attempt to remove existing emoji at storage path (might be broken / out-of-date)
if err := p.manager.storage.Delete(ctx, p.emoji.ImagePath); err != nil {
return fmt.Errorf("error removing emoji from storage: %v", err)
}
}
// Write the final image reader stream to our storage.
sz, err = p.manager.storage.PutStream(ctx, p.emoji.ImagePath, r)
if err != nil {
return fmt.Errorf("error writing emoji to storage: %w", err)
}
// Once again check size in case none was provided previously.
if size := bytesize.Size(sz); size > maxSize {
if err := p.manager.storage.Delete(ctx, p.emoji.ImagePath); err != nil {
log.Errorf("error removing too-large-emoji from storage: %v", err)
}
return fmt.Errorf("calculated emoji size %s greater than max allowed %s", size, maxSize)
}
// Fill in remaining attachment data now it's stored.
p.emoji.ImageURL = uris.GenerateURIForAttachment(
p.instAccID,
string(TypeEmoji),
string(SizeOriginal),
pathID,
info.Extension,
)
p.emoji.ImageContentType = info.MIME.Value
p.emoji.ImageFileSize = int(sz)
return nil
}
func (p *ProcessingEmoji) finish(ctx context.Context) error {
// Fetch a stream to the original file in storage.
rc, err := p.manager.storage.GetStream(ctx, p.emoji.ImagePath)
if err != nil {
return fmt.Errorf("error loading file from storage: %w", err)
}
defer rc.Close()
// Decode the image from storage.
staticImg, err := decodeImage(rc)
if err != nil {
return fmt.Errorf("error decoding image: %w", err)
}
// The image should be in-memory by now.
if err := rc.Close(); err != nil {
return fmt.Errorf("error closing file: %w", err)
}
// This shouldn't already exist, but we do a check as it's worth logging.
if have, _ := p.manager.storage.Has(ctx, p.emoji.ImageStaticPath); have {
log.Warnf("static emoji already exists at storage path: %s", p.emoji.ImagePath)
// Attempt to remove static existing emoji at storage path (might be broken / out-of-date)
if err := p.manager.storage.Delete(ctx, p.emoji.ImageStaticPath); err != nil {
return fmt.Errorf("error removing static emoji from storage: %v", err)
}
}
// Create an emoji PNG encoder stream.
enc := staticImg.ToPNG()
// Stream-encode the PNG static image into storage.
sz, err := p.manager.storage.PutStream(ctx, p.emoji.ImageStaticPath, enc)
if err != nil {
return fmt.Errorf("error stream-encoding static emoji to storage: %w", err)
}
// Set written image size.
p.emoji.ImageStaticFileSize = int(sz)
return nil
}
func (m *manager) preProcessEmoji(ctx context.Context, data DataFunc, postData PostDataCallbackFunc, shortcode string, emojiID string, uri string, ai *AdditionalEmojiInfo, refresh bool) (*ProcessingEmoji, error) {
instanceAccount, err := m.db.GetInstanceAccount(ctx, "")
if err != nil {
return nil, fmt.Errorf("preProcessEmoji: error fetching this instance account from the db: %s", err)
}
var newPathID string
var emoji *gtsmodel.Emoji
if refresh {
emoji, err = m.db.GetEmojiByID(ctx, emojiID)
if err != nil {
return nil, fmt.Errorf("preProcessEmoji: error fetching emoji to refresh from the db: %s", err)
}
// if this is a refresh, we will end up with new images
// stored for this emoji, so we can use the postData function
// to perform clean up of the old images from storage
originalPostData := postData
originalImagePath := emoji.ImagePath
originalImageStaticPath := emoji.ImageStaticPath
postData = func(innerCtx context.Context) error {
// trigger the original postData function if it was provided
if originalPostData != nil {
if err := originalPostData(innerCtx); err != nil {
return err
}
}
l := log.WithField("shortcode@domain", emoji.Shortcode+"@"+emoji.Domain)
l.Debug("postData: cleaning up old emoji files for refreshed emoji")
if err := m.storage.Delete(innerCtx, originalImagePath); err != nil && !errors.Is(err, gostore.ErrNotFound) {
l.Errorf("postData: error cleaning up old emoji image at %s for refreshed emoji: %s", originalImagePath, err)
}
if err := m.storage.Delete(innerCtx, originalImageStaticPath); err != nil && !errors.Is(err, gostore.ErrNotFound) {
l.Errorf("postData: error cleaning up old emoji static image at %s for refreshed emoji: %s", originalImageStaticPath, err)
}
return nil
}
newPathID, err = id.NewRandomULID()
if err != nil {
return nil, fmt.Errorf("preProcessEmoji: error generating alternateID for emoji refresh: %s", err)
}
// store + serve static image at new path ID
emoji.ImageStaticURL = uris.GenerateURIForAttachment(instanceAccount.ID, string(TypeEmoji), string(SizeStatic), newPathID, mimePng)
emoji.ImageStaticPath = fmt.Sprintf("%s/%s/%s/%s.%s", instanceAccount.ID, TypeEmoji, SizeStatic, newPathID, mimePng)
emoji.Shortcode = shortcode
emoji.URI = uri
} else {
disabled := false
visibleInPicker := true
// populate initial fields on the emoji -- some of these will be overwritten as we proceed
emoji = &gtsmodel.Emoji{
ID: emojiID,
CreatedAt: time.Now(),
Shortcode: shortcode,
Domain: "", // assume our own domain unless told otherwise
ImageRemoteURL: "",
ImageStaticRemoteURL: "",
ImageURL: "", // we don't know yet
ImageStaticURL: uris.GenerateURIForAttachment(instanceAccount.ID, string(TypeEmoji), string(SizeStatic), emojiID, mimePng), // all static emojis are encoded as png
ImagePath: "", // we don't know yet
ImageStaticPath: fmt.Sprintf("%s/%s/%s/%s.%s", instanceAccount.ID, TypeEmoji, SizeStatic, emojiID, mimePng), // all static emojis are encoded as png
ImageContentType: "", // we don't know yet
ImageStaticContentType: mimeImagePng, // all static emojis are encoded as png
ImageFileSize: 0,
ImageStaticFileSize: 0,
Disabled: &disabled,
URI: uri,
VisibleInPicker: &visibleInPicker,
CategoryID: "",
}
}
emoji.ImageUpdatedAt = time.Now()
emoji.UpdatedAt = time.Now()
// check if we have additional info to add to the emoji,
// and overwrite some of the emoji fields if so
if ai != nil {
if ai.CreatedAt != nil {
emoji.CreatedAt = *ai.CreatedAt
}
if ai.Domain != nil {
emoji.Domain = *ai.Domain
}
if ai.ImageRemoteURL != nil {
emoji.ImageRemoteURL = *ai.ImageRemoteURL
}
if ai.ImageStaticRemoteURL != nil {
emoji.ImageStaticRemoteURL = *ai.ImageStaticRemoteURL
}
if ai.Disabled != nil {
emoji.Disabled = ai.Disabled
}
if ai.VisibleInPicker != nil {
emoji.VisibleInPicker = ai.VisibleInPicker
}
if ai.CategoryID != nil {
emoji.CategoryID = *ai.CategoryID
}
}
processingEmoji := &ProcessingEmoji{
instAccID: instanceAccount.ID,
emoji: emoji,
refresh: refresh,
newPathID: newPathID,
dataFn: data,
postFn: postData,
manager: m,
}
return processingEmoji, nil
}