[feature] Provide .well-known/host-meta endpoint (#1604)

* [feature] Provide .well-known/host-meta endpoint

This adds the host-meta endpoint as Mastodon clients use this to
discover the API domain to use when the host and account domains aren't
the same.

* Address review comments
This commit is contained in:
Daenney
2023-03-09 18:55:45 +01:00
committed by GitHub
parent 9ba35c65eb
commit a312238e79
9 changed files with 167 additions and 4 deletions

View File

@@ -25,6 +25,7 @@ type MIME string
const (
AppJSON MIME = `application/json`
AppXML MIME = `application/xml`
AppXMLXRD MIME = `application/xrd+xml`
AppRSSXML MIME = `application/rss+xml`
AppActivityJSON MIME = `application/activity+json`
AppActivityLDJSON MIME = `application/ld+json; profile="https://www.w3.org/ns/activitystreams"`

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@@ -58,6 +58,11 @@ var HTMLOrActivityPubHeaders = []MIME{
AppActivityLDJSON,
}
var HostMetaHeaders = []MIME{
AppXMLXRD,
AppXML,
}
// NegotiateAccept takes the *gin.Context from an incoming request, and a
// slice of Offers, and performs content negotiation for the given request
// with the given content-type offers. It will return a string representation

View File

@@ -20,6 +20,7 @@ package api
import (
"github.com/gin-gonic/gin"
"github.com/superseriousbusiness/gotosocial/internal/api/wellknown/hostmeta"
"github.com/superseriousbusiness/gotosocial/internal/api/wellknown/nodeinfo"
"github.com/superseriousbusiness/gotosocial/internal/api/wellknown/webfinger"
"github.com/superseriousbusiness/gotosocial/internal/middleware"
@@ -30,6 +31,7 @@ import (
type WellKnown struct {
nodeInfo *nodeinfo.Module
webfinger *webfinger.Module
hostMeta *hostmeta.Module
}
func (w *WellKnown) Route(r router.Router, m ...gin.HandlerFunc) {
@@ -45,11 +47,13 @@ func (w *WellKnown) Route(r router.Router, m ...gin.HandlerFunc) {
w.nodeInfo.Route(wellKnownGroup.Handle)
w.webfinger.Route(wellKnownGroup.Handle)
w.hostMeta.Route(wellKnownGroup.Handle)
}
func NewWellKnown(p *processing.Processor) *WellKnown {
return &WellKnown{
nodeInfo: nodeinfo.New(p),
webfinger: webfinger.New(p),
hostMeta: hostmeta.New(p),
}
}

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@@ -0,0 +1,45 @@
/*
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 hostmeta
import (
"net/http"
"github.com/gin-gonic/gin"
"github.com/superseriousbusiness/gotosocial/internal/processing"
)
const (
HostMetaContentType = "application/xrd+xml"
HostMetaPath = "/host-meta"
)
type Module struct {
processor *processing.Processor
}
func New(processor *processing.Processor) *Module {
return &Module{
processor: processor,
}
}
func (m *Module) Route(attachHandler func(method string, path string, f ...gin.HandlerFunc) gin.IRoutes) {
attachHandler(http.MethodGet, HostMetaPath, m.HostMetaGETHandler)
}

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@@ -0,0 +1,73 @@
/*
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 hostmeta
import (
"bytes"
"encoding/xml"
"net/http"
"github.com/gin-gonic/gin"
apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
)
// HostMetaGETHandler swagger:operation GET /.well-known/host-meta hostMetaGet
//
// Returns a compliant hostmeta response to web host metadata queries.
//
// See: https://www.rfc-editor.org/rfc/rfc6415.html
//
// ---
// tags:
// - .well-known
//
// produces:
// - application/xrd+xml"
//
// responses:
// '200':
// schema:
// "$ref": "#/definitions/hostmeta"
func (m *Module) HostMetaGETHandler(c *gin.Context) {
if _, err := apiutil.NegotiateAccept(c, apiutil.HostMetaHeaders...); err != nil {
apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGetV1)
return
}
hostMeta := m.processor.Fedi().HostMetaGet()
// this setup with a separate buffer we encode into is used because
// xml.Marshal does not emit xml.Header by itself
var buf bytes.Buffer
// Preallocate buffer of reasonable length.
buf.Grow(len(xml.Header) + 64)
// No need to check for error on write to buffer.
_, _ = buf.WriteString(xml.Header)
// Encode host-meta as XML to in-memory buffer.
if err := xml.NewEncoder(&buf).Encode(hostMeta); err != nil {
apiutil.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGetV1)
return
}
c.Data(http.StatusOK, HostMetaContentType, buf.Bytes())
}