[feature] Federate pinned posts (aka featuredCollection) in and out (#1560)

* start fiddling

* the ol' fiddle + update

* start working on fetching statuses

* poopy doopy doo where r u uwu

* further adventures in featuring statuses

* finishing up

* fmt

* simply status unpin loop

* move empty featured check back to caller function

* remove unnecessary log.WithContext calls

* remove unnecessary IsIRI() checks

* add explanatory comment about status URIs

* change log level to error

* better test names

internal/api/activitypub/emoji/emojiget.go

@@ -43,7 +43,7 @@ func (m *Module) EmojiGetHandler(c *gin.Context) {
 		return
 	}
 
-	resp, errWithCode := m.processor.Fedi().EmojiGet(apiutil.TransferSignatureContext(c), requestedEmojiID, c.Request.URL)
+	resp, errWithCode := m.processor.Fedi().EmojiGet(apiutil.TransferSignatureContext(c), requestedEmojiID)
 	if errWithCode != nil {
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return

internal/api/activitypub/users/common.go

@@ -18,12 +18,14 @@
 
 package users
 
-// SwaggerCollection represents an activitypub collection.
+// SwaggerCollection represents an ActivityPub Collection.
 // swagger:model swaggerCollection
 type SwaggerCollection struct {
-	// ActivityStreams context.
+	// ActivityStreams JSON-LD context.
+	// A string or an array of strings, or more
+	// complex nested items.
 	// example: https://www.w3.org/ns/activitystreams
-	Context string `json:"@context"`
+	Context interface{} `json:"@context"`
 	// ActivityStreams ID.
 	// example: https://example.org/users/some_user/statuses/106717595988259568/replies
 	ID string `json:"id"`
@@ -55,3 +57,25 @@ type SwaggerCollectionPage struct {
 	// example: ["https://example.org/users/some_other_user/statuses/086417595981111564", "https://another.example.com/users/another_user/statuses/01FCN8XDV3YG7B4R42QA6YQZ9R"]
 	Items []string `json:"items"`
 }
+
+// SwaggerFeaturedCollection represents an ActivityPub OrderedCollection.
+// swagger:model swaggerFeaturedCollection
+type SwaggerFeaturedCollection struct {
+	// ActivityStreams JSON-LD context.
+	// A string or an array of strings, or more
+	// complex nested items.
+	// example: https://www.w3.org/ns/activitystreams
+	Context interface{} `json:"@context"`
+	// ActivityStreams ID.
+	// example: https://example.org/users/some_user/collections/featured
+	ID string `json:"id"`
+	// ActivityStreams type.
+	// example: OrderedCollection
+	Type string `json:"type"`
+	// List of status URIs.
+	// example: ['https://example.org/users/some_user/statuses/01GSZ0F7Q8SJKNRF777GJD271R', 'https://example.org/users/some_user/statuses/01GSZ0G012CBQ7TEKX689S3QRE']
+	Items []string `json:"items"`
+	// Number of items in this collection.
+	// example: 2
+	TotalItems int
+}

internal/api/activitypub/users/featured.go

@@ -0,0 +1,97 @@
+/*
+   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 users
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+// FeaturedCollectionGETHandler swagger:operation GET /users/{username}/collections/featured s2sFeaturedCollectionGet
+//
+// Get the featured collection (pinned posts) for a user.
+//
+// The response will contain an ordered collection of Note URIs in the `items` property.
+//
+// It is up to the caller to dereference the provided Note URIs (or not, if they already have them cached).
+//
+// HTTP signature is required on the request.
+//
+//	---
+//	tags:
+//	- s2s/federation
+//
+//	produces:
+//	- application/activity+json
+//
+//	responses:
+//		'200':
+//			in: body
+//			schema:
+//				"$ref": "#/definitions/swaggerFeaturedCollection"
+//		'400':
+//			description: bad request
+//		'401':
+//			description: unauthorized
+//		'403':
+//			description: forbidden
+//		'404':
+//			description: not found
+func (m *Module) FeaturedCollectionGETHandler(c *gin.Context) {
+	// usernames on our instance are always lowercase
+	requestedUsername := strings.ToLower(c.Param(UsernameKey))
+	if requestedUsername == "" {
+		err := errors.New("no username specified in request")
+		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	format, err := apiutil.NegotiateAccept(c, apiutil.HTMLOrActivityPubHeaders...)
+	if err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	if format == string(apiutil.TextHTML) {
+		// This isn't an ActivityPub request;
+		// redirect to the user's profile.
+		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername)
+		return
+	}
+
+	resp, errWithCode := m.processor.Fedi().FeaturedCollectionGet(apiutil.TransferSignatureContext(c), requestedUsername)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	b, err := json.Marshal(resp)
+	if err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGetV1)
+		return
+	}
+
+	c.Data(http.StatusOK, format, b)
+}

internal/api/activitypub/users/followers.go

@@ -46,12 +46,13 @@ func (m *Module) FollowersGETHandler(c *gin.Context) {
 	}
 
 	if format == string(apiutil.TextHTML) {
-		// redirect to the user's profile
+		// This isn't an ActivityPub request;
+		// redirect to the user's profile.
 		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername)
 		return
 	}
 
-	resp, errWithCode := m.processor.Fedi().FollowersGet(apiutil.TransferSignatureContext(c), requestedUsername, c.Request.URL)
+	resp, errWithCode := m.processor.Fedi().FollowersGet(apiutil.TransferSignatureContext(c), requestedUsername)
 	if errWithCode != nil {
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return

internal/api/activitypub/users/following.go

@@ -46,12 +46,13 @@ func (m *Module) FollowingGETHandler(c *gin.Context) {
 	}
 
 	if format == string(apiutil.TextHTML) {
-		// redirect to the user's profile
+		// This isn't an ActivityPub request;
+		// redirect to the user's profile.
 		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername)
 		return
 	}
 
-	resp, errWithCode := m.processor.Fedi().FollowingGet(apiutil.TransferSignatureContext(c), requestedUsername, c.Request.URL)
+	resp, errWithCode := m.processor.Fedi().FollowingGet(apiutil.TransferSignatureContext(c), requestedUsername)
 	if errWithCode != nil {
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return

internal/api/activitypub/users/outboxget.go

@@ -101,7 +101,8 @@ func (m *Module) OutboxGETHandler(c *gin.Context) {
 	}
 
 	if format == string(apiutil.TextHTML) {
-		// redirect to the user's profile
+		// This isn't an ActivityPub request;
+		// redirect to the user's profile.
 		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername)
 		return
 	}
@@ -129,7 +130,7 @@ func (m *Module) OutboxGETHandler(c *gin.Context) {
 		maxID = maxIDString
 	}
 
-	resp, errWithCode := m.processor.Fedi().OutboxGet(apiutil.TransferSignatureContext(c), requestedUsername, page, maxID, minID, c.Request.URL)
+	resp, errWithCode := m.processor.Fedi().OutboxGet(apiutil.TransferSignatureContext(c), requestedUsername, page, maxID, minID)
 	if errWithCode != nil {
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return

internal/api/activitypub/users/repliesget.go

@@ -150,7 +150,7 @@ func (m *Module) StatusRepliesGETHandler(c *gin.Context) {
 		minID = minIDString
 	}
 
-	resp, errWithCode := m.processor.Fedi().StatusRepliesGet(apiutil.TransferSignatureContext(c), requestedUsername, requestedStatusID, page, onlyOtherAccounts, minID, c.Request.URL)
+	resp, errWithCode := m.processor.Fedi().StatusRepliesGet(apiutil.TransferSignatureContext(c), requestedUsername, requestedStatusID, page, onlyOtherAccounts, c.Query("only_other_accounts") != "", minID)
 	if errWithCode != nil {
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return

internal/api/activitypub/users/statusget.go

@@ -59,7 +59,7 @@ func (m *Module) StatusGETHandler(c *gin.Context) {
 		return
 	}
 
-	resp, errWithCode := m.processor.Fedi().StatusGet(apiutil.TransferSignatureContext(c), requestedUsername, requestedStatusID, c.Request.URL)
+	resp, errWithCode := m.processor.Fedi().StatusGet(apiutil.TransferSignatureContext(c), requestedUsername, requestedStatusID)
 	if errWithCode != nil {
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return

internal/api/activitypub/users/user.go

@@ -50,6 +50,8 @@ const (
 	FollowersPath = BasePath + "/" + uris.FollowersPath
 	// FollowingPath is for serving GET request's to a user's following list, with the given username key.
 	FollowingPath = BasePath + "/" + uris.FollowingPath
+	// FeaturedCollectionPath is for serving GET requests to a user's list of featured (pinned) statuses.
+	FeaturedCollectionPath = BasePath + "/" + uris.CollectionsPath + "/" + uris.FeaturedPath
 	// StatusPath is for serving GET requests to a particular status by a user, with the given username key and status ID
 	StatusPath = BasePath + "/" + uris.StatusesPath + "/:" + StatusIDKey
 	// StatusRepliesPath is for serving the replies collection of a status.
@@ -71,6 +73,7 @@ func (m *Module) Route(attachHandler func(method string, path string, f ...gin.H
 	attachHandler(http.MethodPost, InboxPath, m.InboxPOSTHandler)
 	attachHandler(http.MethodGet, FollowersPath, m.FollowersGETHandler)
 	attachHandler(http.MethodGet, FollowingPath, m.FollowingGETHandler)
+	attachHandler(http.MethodGet, FeaturedCollectionPath, m.FeaturedCollectionGETHandler)
 	attachHandler(http.MethodGet, StatusPath, m.StatusGETHandler)
 	attachHandler(http.MethodGet, StatusRepliesPath, m.StatusRepliesGETHandler)
 	attachHandler(http.MethodGet, OutboxPath, m.OutboxGETHandler)