feat: Follow remote users; feed tab (#10380)

This is hopefully the final part of PR #4767, rebased and squashed.

More thorough federation tests are at https://code.forgejo.org/forgejo/end-to-end/pulls/1276 but the mock has been extended to hopefully cover a good chunk as well.

Co-authored-by: Gergely Nagy <forgejo@gergo.csillger.hu>
Co-authored-by: Michael Jerger <michael.jerger@meissa-gmbh.de>
Co-authored-by: zam <mirco.zachmann@meissa.de>
Co-authored-by: Panagiotis "Ivory" Vasilopoulos <git@n0toose.net>

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10380
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: famfo <famfo@famfo.xyz>
Co-committed-by: famfo <famfo@famfo.xyz>

.deadcode-out

@@ -88,7 +88,6 @@ forgejo.org/modules/eventsource
 	Event.String
 
 forgejo.org/modules/forgefed
-	NewForgeFollow
 	NewForgeUndoLike
 	ForgeUndoLike.UnmarshalJSON
 	ForgeUndoLike.Validate
@@ -227,9 +226,6 @@ forgejo.org/routers/web/org
 forgejo.org/services/context
 	GetPrivateContext
 
-forgejo.org/services/federation
-	FollowRemoteActor
-
 forgejo.org/services/notify
 	UnregisterNotifier
 

models/activities/federated_user_activity.go

@@ -82,7 +82,7 @@ func GetFollowingFeeds(ctx context.Context, actorID int64, opts GetFollowingFeed
 	sess = db.SetSessionPagination(sess, &opts)
 
 	actions := make([]*FederatedUserActivity, 0, opts.PageSize)
-	count, err := sess.FindAndCount(&actions)
+	count, err := sess.Desc("`federated_user_activity`.created").FindAndCount(&actions)
 	if err != nil {
 		return nil, 0, fmt.Errorf("FindAndCount: %w", err)
 	}

models/user/federated_user.go

@@ -5,6 +5,7 @@ package user
 
 import (
 	"database/sql"
+	"fmt"
 
 	"forgejo.org/modules/validation"
 )
@@ -42,3 +43,18 @@ func (federatedUser FederatedUser) Validate() []string {
 	result = append(result, validation.ValidateNotEmpty(federatedUser.InboxPath, "InboxPath")...)
 	return result
 }
+
+func (federatedUser *FederatedUser) LogString() string {
+	if federatedUser == nil {
+		return "<FederatedUser nil>"
+	}
+
+	return fmt.Sprintf(
+		"<FederatedUser ID: %d, UserID: %d, ExternalID: %s, NormalizedOriginalURL: %s, InboxPath: %s>",
+		federatedUser.ID,
+		federatedUser.UserID,
+		federatedUser.ExternalID,
+		federatedUser.NormalizedOriginalURL,
+		federatedUser.InboxPath,
+	)
+}

modules/forgefed/inbox.go

@@ -0,0 +1,15 @@
+// Copyright 2024, 2025 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package forgefed
+
+import (
+	ap "github.com/go-ap/activitypub"
+)
+
+// ForgeFollow activity data type
+// swagger:model
+type ForgeInbox struct {
+	// swagger:ignore
+	ap.InboxStream
+}

modules/templates/helper.go

@@ -60,6 +60,7 @@ func NewFuncMap() template.FuncMap {
 		"QueryEscape":        QueryEscape,
 		"JSEscape":           JSEscapeSafe,
 		"SanitizeHTML":       SanitizeHTML,
+		"SanitizeHTMLStrict": SanitizeHTMLStrict,
 		"URLJoin":            util.URLJoin,
 		"DotEscape":          DotEscape,
 
@@ -257,6 +258,10 @@ func SanitizeHTML(s string) template.HTML {
 	return template.HTML(markup.Sanitize(s))
 }
 
+func SanitizeHTMLStrict(s string) template.HTML {
+	return template.HTML(markup.SanitizeDescription(s))
+}
+
 func HTMLEscape(s any) template.HTML {
 	switch v := s.(type) {
 	case string:

modules/test/distant_federation_server_mock.go

@@ -4,29 +4,38 @@
 package test
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
+	"net/url"
 	"strings"
 	"testing"
 
 	"forgejo.org/modules/util"
+
+	ap "github.com/go-ap/activitypub"
+	"github.com/go-ap/jsonld"
+	"github.com/google/uuid"
 )
 
+type ApActorMock struct {
+	PrivKey string
+	PubKey  string
+}
+
 type FederationServerMockPerson struct {
 	ID      int64
 	Name    string
 	PubKey  string
 	PrivKey string
 }
+
 type FederationServerMockRepository struct {
 	ID int64
 }
-type ApActorMock struct {
-	PrivKey string
-	PubKey  string
-}
+
 type FederationServerMock struct {
 	ApActor      ApActorMock
 	Persons      []FederationServerMockPerson
@@ -34,6 +43,35 @@ type FederationServerMock struct {
 	LastPost     string
 }
 
+func NewApActorMock() ApActorMock {
+	priv, pub, _ := util.GenerateKeyPair(1024)
+	return ApActorMock{
+		PrivKey: priv,
+		PubKey:  pub,
+	}
+}
+
+func (u *ApActorMock) KeyID(host string) string {
+	return fmt.Sprintf("%s/api/v1/activitypub/actor#main-key", host)
+}
+
+func (u *ApActorMock) marshal(host string) string {
+	baseID := fmt.Sprintf("http://%s/api/v1/activitypub/actor", host)
+
+	return fmt.Sprintf(
+		`{ "@context": ["https://www.w3.org/ns/activitystreams", "https://w3id.org/security/v1"],`+
+			`"id": "%[1]s",`+
+			`"type": "Application",`+
+			`"preferredUsername": "ghost",`+
+			`"publicKey": {`+
+			` "id": "%[1]s#main-key",`+
+			` "owner": "%[1]s",`+
+			` "publicKeyPem": %[2]q }}`,
+		baseID,
+		u.PubKey,
+	)
+}
+
 func NewFederationServerMockPerson(id int64, name string) FederationServerMockPerson {
 	priv, pub, _ := util.GenerateKeyPair(3072)
 	return FederationServerMockPerson{
@@ -48,24 +86,6 @@ func (p *FederationServerMockPerson) KeyID(host string) string {
 	return fmt.Sprintf("%[1]v/api/v1/activitypub/user-id/%[2]v#main-key", host, p.ID)
 }
 
-func NewFederationServerMockRepository(id int64) FederationServerMockRepository {
-	return FederationServerMockRepository{
-		ID: id,
-	}
-}
-
-func NewApActorMock() ApActorMock {
-	priv, pub, _ := util.GenerateKeyPair(1024)
-	return ApActorMock{
-		PrivKey: priv,
-		PubKey:  pub,
-	}
-}
-
-func (u *ApActorMock) KeyID(host string) string {
-	return fmt.Sprintf("%[1]v/api/v1/activitypub/actor#main-key", host)
-}
-
 func (p FederationServerMockPerson) marshal(host string) string {
 	return fmt.Sprintf(`{"@context":["https://www.w3.org/ns/activitystreams","https://w3id.org/security/v1"],`+
 		`"id":"http://%[1]v/api/v1/activitypub/user-id/%[2]v",`+
@@ -80,6 +100,12 @@ func (p FederationServerMockPerson) marshal(host string) string {
 		`"publicKeyPem":%[4]q}}`, host, p.ID, p.Name, p.PubKey)
 }
 
+func NewFederationServerMockRepository(id int64) FederationServerMockRepository {
+	return FederationServerMockRepository{
+		ID: id,
+	}
+}
+
 func NewFederationServerMock() *FederationServerMock {
 	return &FederationServerMock{
 		ApActor: NewApActorMock(),
@@ -103,6 +129,26 @@ func (mock *FederationServerMock) recordLastPost(t *testing.T, req *http.Request
 	mock.LastPost = strings.ReplaceAll(buf.String(), req.Host, "DISTANT_FEDERATION_HOST")
 }
 
+func (mock *FederationServerMock) FollowActorUnsigned(host string, localID int64, uri, inboxURL url.URL) error {
+	apID := fmt.Sprintf("%s/api/v1/activitypub/user-id/%d", host, localID)
+
+	activity := ap.Follow{}
+	activity.Type = ap.FollowType
+	activity.ID = ap.IRI(apID + "/follows/" + uuid.New().String())
+	activity.Actor = ap.IRI(apID)
+	activity.Object = ap.IRI(uri.String())
+
+	payload, err := jsonld.WithContext(jsonld.IRI(ap.ActivityBaseURI)).Marshal(activity)
+	if err != nil {
+		return err
+	}
+
+	reader := bytes.NewReader(payload)
+	_, err = http.Post(inboxURL.String(), "application/activity+json", reader)
+
+	return err
+}
+
 func (mock *FederationServerMock) DistantServer(t *testing.T) *httptest.Server {
 	federatedRoutes := http.NewServeMux()
 
@@ -122,6 +168,10 @@ func (mock *FederationServerMock) DistantServer(t *testing.T) *httptest.Server {
 		})
 
 	for _, person := range mock.Persons {
+		federatedRoutes.HandleFunc(fmt.Sprintf("/api/v1/activitypub/user-id/alias%v", person.ID),
+			func(res http.ResponseWriter, req *http.Request) {
+				fmt.Fprint(res, person.marshal(req.Host))
+			})
 		federatedRoutes.HandleFunc(fmt.Sprintf("/api/v1/activitypub/user-id/%v", person.ID),
 			func(res http.ResponseWriter, req *http.Request) {
 				// curl -H "Accept: application/json" https://federated-repo.prod.meissa.de/api/v1/activitypub/user-id/2
@@ -139,10 +189,18 @@ func (mock *FederationServerMock) DistantServer(t *testing.T) *httptest.Server {
 				mock.recordLastPost(t, req)
 			})
 	}
+
+	federatedRoutes.HandleFunc("GET /api/v1/activitypub/actor",
+		func(res http.ResponseWriter, req *http.Request) {
+			fmt.Fprint(res, mock.ApActor.marshal(req.Host))
+		})
+
 	federatedRoutes.HandleFunc("/",
 		func(res http.ResponseWriter, req *http.Request) {
 			t.Errorf("Unhandled %v request: %q", req.Method, req.URL.EscapedPath())
 		})
+
 	federatedSrv := httptest.NewServer(federatedRoutes)
+
 	return federatedSrv
 }

options/locale_next/locale_en-US.json

@@ -261,6 +261,12 @@
 	"settings.access_token.admin_disabled": "Administrative permissions are disabled.",
 	"error.must_enable_2fa": "This Forgejo instance requires users to enable two-factor authentication before they can access their accounts. Enable it at: %s",
 	"avatar.constraints_hint": "Custom avatar may not exceed %[1]s in size or be larger than %[2]dx%[3]d pixels",
+	"user.activitypub_feed.feed": "Fediverse Feed",
+	"user.activitypub_feed.no_activity": "No fediverse activity",
+	"user.activitypub_feed.is_empty": "Your fediverse feed is empty.",
+	"user.activitypub_feed.hint": "This feed shows activities from fediverse accounts that you follow, as well as federated posts that mentioned you.",
+	"user.activitypub_feed.posted_on": "Posted on %[1]s",
+	"user.activitypub_feed.original_source": "Original source",
 	"user.ghost.tooltip": "This user has been deleted, or cannot be matched.",
 	"og.repo.summary_card.alt_description": "Summary card of repository %[1]s, described as: %[2]s",
 	"repo.commit.load_tags_failed": "Load tags failed because of internal error",

public/assets/img/svg/fediverse-small.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 6.35 6.35" class="svg fediverse-small" width="16" height="16" aria-hidden="true"><path d="M3.59 1.16a.204.204 0 0 0-.24.16.204.204 0 0 0 .158.24 1.63 1.63 0 0 1 .832.45 1.64 1.64 0 0 1 .353 1.806.204.204 0 0 0 .11.268.204.204 0 0 0 .265-.11A2.055 2.055 0 0 0 3.59 1.16M1.547 2.266a.204.204 0 0 0-.266.109 2.054 2.054 0 0 0 1.48 2.814.204.204 0 0 0 .241-.158.204.204 0 0 0-.16-.242 1.63 1.63 0 0 1-.832-.45 1.64 1.64 0 0 1-.483-1.163c0-.228.046-.446.13-.643a.204.204 0 0 0-.11-.267" style="stroke-linecap:round" transform="matrix(1.28704 0 0 1.31102 -.911 -.987)"/><path d="M1.72.264C1.065.264.53.802.53 1.456c0 .655.535 1.19 1.19 1.19s1.19-.535 1.19-1.19S2.373.264 1.72.264m0 .53c.368 0 .661.294.661.662a.66.66 0 0 1-.661.662.66.66 0 0 1-.662-.662c0-.368.293-.661.662-.661M4.63 3.705c-.654 0-1.19.535-1.19 1.19s.536 1.19 1.19 1.19c.655 0 1.19-.536 1.19-1.19 0-.655-.535-1.19-1.19-1.19m0 .527c.37 0 .661.294.661.663a.657.657 0 0 1-.66.662.66.66 0 0 1-.662-.662c0-.369.293-.663.662-.663"/></svg>

release-notes/10380.md

@@ -0,0 +1 @@
+Allow forgejo users to follow remote users and display federated notes. This feature is still missing some some other basic features for "production use": there is no moderation support, UI for following federated users, and federation is still limited to forgejo, Mastodon, and GoToSocial.

routers/api/v1/api.go

@@ -1036,6 +1036,11 @@ func Routes() *web.Route {
 					m.Delete("", user.Unfollow)
 				}, context.UserAssignmentAPI())
 			})
+			if setting.Federation.Enabled {
+				m.Group("/activitypub", func() {
+					m.Post("/follow", bind(api.APRemoteFollowOption{}), user.ActivityPubFollow)
+				})
+			}
 
 			// (admin:public_key scope)
 			m.Group("/keys", func() {

routers/api/v1/swagger/options.go

@@ -19,6 +19,9 @@ type swaggerParameterBodies struct {
 	// in:body
 	ForgeLike ffed.ForgeLike
 
+	// in:body
+	APRemoteFollowOption api.APRemoteFollowOption `json:"body"`
+
 	// in:body
 	AddCollaboratorOption api.AddCollaboratorOption
 

routers/api/v1/user/follower.go

@@ -10,9 +10,11 @@ import (
 
 	user_model "forgejo.org/models/user"
 	api "forgejo.org/modules/structs"
+	"forgejo.org/modules/web"
 	"forgejo.org/routers/api/v1/utils"
 	"forgejo.org/services/context"
 	"forgejo.org/services/convert"
+	"forgejo.org/services/federation"
 )
 
 func responseAPIUsers(ctx *context.APIContext, users []*user_model.User) {
@@ -279,3 +281,33 @@ func Unfollow(ctx *context.APIContext) {
 	}
 	ctx.Status(http.StatusNoContent)
 }
+
+// Follow follow a remote activitypub account
+func ActivityPubFollow(ctx *context.APIContext) {
+	// swagger:operation POST /user/activitypub/follow user userCurrentActivityPubFollow
+	// ---
+	// summary: Follow a remote activitypub account
+	// parameters:
+	// - name: body
+	//   in: body
+	//   schema:
+	//     "$ref": "#/definitions/APRemoteFollowOption"
+	// responses:
+	//   "204":
+	//     "$ref": "#/responses/empty"
+	//   "401":
+	//     "$ref": "#/responses/unauthorized"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
+	form := web.GetForm(ctx).(*api.APRemoteFollowOption)
+
+	if err := federation.FollowRemoteActor(ctx, ctx.Doer, form.Target); err != nil {
+		ctx.Error(http.StatusInternalServerError, "federation.FollowRemoteActor", err)
+		return
+	}
+
+	ctx.Status(http.StatusNoContent)
+}

routers/web/user/profile.go

@@ -176,6 +176,28 @@ func prepareUserProfileTabData(ctx *context.Context, showPrivate bool, profileDb
 		} else {
 			ctx.Data["CardsNoneMsg"] = ctx.Tr("followers.outgoing.list.none", ctx.ContextUser.Name)
 		}
+	case "feed":
+		if setting.Federation.Enabled {
+			pagingNum = setting.UI.FeedPagingNum
+			var items []*activities_model.FederatedUserActivity
+			var count int64
+			if ctx.Doer != nil {
+				items, count, err = activities_model.GetFollowingFeeds(ctx,
+					ctx.Doer.ID,
+					activities_model.GetFollowingFeedsOptions{
+						ListOptions: db.ListOptions{
+							PageSize: pagingNum,
+							Page:     page,
+						},
+					})
+				if err != nil {
+					ctx.ServerError("GetFollowingFeeds", err)
+					return
+				}
+			}
+			ctx.Data["FollowingFeeds"] = items
+			total = int(count)
+		}
 	case "activity":
 		// prepare heatmap data
 		if setting.Service.EnableUserHeatmap {

services/federation/federation_service.go

@@ -11,7 +11,7 @@ import (
 	"strings"
 
 	"forgejo.org/models/forgefed"
-	"forgejo.org/models/user"
+	user_model "forgejo.org/models/user"
 	"forgejo.org/modules/activitypub"
 	fm "forgejo.org/modules/forgefed"
 	"forgejo.org/modules/log"
@@ -47,32 +47,51 @@ func FindOrCreateFederationHost(ctx context.Context, actorURI string) (*forgefed
 	return federationHost, nil
 }
 
-func FindOrCreateFederatedUser(ctx context.Context, actorURI string) (*user.User, *user.FederatedUser, *forgefed.FederationHost, error) {
+func FindOrCreateFederatedUser(ctx context.Context, actorURI string) (*user_model.User, *user_model.FederatedUser, *forgefed.FederationHost, error) {
 	user, federatedUser, federationHost, err := findFederatedUser(ctx, actorURI)
 	if err != nil {
 		return nil, nil, nil, err
 	}
+
 	personID, err := fm.NewPersonID(actorURI, string(federationHost.NodeInfo.SoftwareName))
 	if err != nil {
 		return nil, nil, nil, err
 	}
 
 	if user != nil {
-		log.Trace("Local ActivityPub user found (actorURI: %#v, user: %#v)", actorURI, user)
+		log.Trace("Local ActivityPub user found (actorURI: %#v, user: %v)", actorURI, user.Name)
 	} else {
 		log.Trace("Attempting to create new user and federatedUser for actorURI: %#v", actorURI)
-		user, federatedUser, err = createUserFromAP(ctx, personID, federationHost.ID)
+		apUser, apFederatedUser, err := fetchUserFromAP(ctx, personID, federationHost)
 		if err != nil {
 			return nil, nil, nil, err
 		}
-		log.Trace("Created user %#v with federatedUser %#v from distant server", user, federatedUser)
+
+		user, federatedUser, federationHost, err = findFederatedUser(ctx, apFederatedUser.NormalizedOriginalURL)
+		if err != nil {
+			return nil, nil, nil, err
+		}
+
+		if user != nil {
+			log.Trace("Resolved alias %s to %s", actorURI, apFederatedUser.NormalizedOriginalURL)
+		} else {
+			user = apUser
+			federatedUser = apFederatedUser
+
+			err := user_model.CreateFederatedUser(ctx, user, federatedUser)
+			if err != nil {
+				return nil, nil, nil, err
+			}
+
+			log.Trace("Created user %s with federatedUser %s from distant server", user.LogString(), federatedUser.LogString())
+		}
 	}
 	log.Trace("Got user: %v", user.Name)
 
 	return user, federatedUser, federationHost, nil
 }
 
-func findFederatedUser(ctx context.Context, actorURI string) (*user.User, *user.FederatedUser, *forgefed.FederationHost, error) {
+func findFederatedUser(ctx context.Context, actorURI string) (*user_model.User, *user_model.FederatedUser, *forgefed.FederationHost, error) {
 	federationHost, err := FindOrCreateFederationHost(ctx, actorURI)
 	if err != nil {
 		return nil, nil, nil, err
@@ -82,7 +101,7 @@ func findFederatedUser(ctx context.Context, actorURI string) (*user.User, *user.
 		return nil, nil, nil, err
 	}
 
-	user, federatedUser, err := user.FindFederatedUser(ctx, actorID.ID, federationHost.ID)
+	user, federatedUser, err := user_model.FindFederatedUser(ctx, actorID.ID, federationHost.ID)
 	if err != nil {
 		return nil, nil, nil, err
 	}
@@ -91,7 +110,7 @@ func findFederatedUser(ctx context.Context, actorURI string) (*user.User, *user.
 }
 
 func createFederationHostFromAP(ctx context.Context, actorID fm.ActorID) (*forgefed.FederationHost, error) {
-	actionsUser := user.NewAPServerActor()
+	actionsUser := user_model.NewAPServerActor()
 
 	clientFactory, err := activitypub.GetClientFactory(ctx)
 	if err != nil {
@@ -137,8 +156,8 @@ func createFederationHostFromAP(ctx context.Context, actorID fm.ActorID) (*forge
 	return &result, nil
 }
 
-func fetchUserFromAP(ctx context.Context, personID fm.PersonID, federationHostID int64) (*user.User, *user.FederatedUser, error) {
-	actionsUser := user.NewAPServerActor()
+func fetchUserFromAP(ctx context.Context, personID fm.PersonID, federationHost *forgefed.FederationHost) (*user_model.User, *user_model.FederatedUser, error) {
+	actionsUser := user_model.NewAPServerActor()
 	clientFactory, err := activitypub.GetClientFactory(ctx)
 	if err != nil {
 		return nil, nil, err
@@ -164,16 +183,18 @@ func fetchUserFromAP(ctx context.Context, personID fm.PersonID, federationHostID
 		return nil, nil, err
 	}
 
-	log.Info("Fetched valid person from distant server: %q", person)
-
 	localFqdn, err := url.ParseRequestURI(setting.AppURL)
 	if err != nil {
 		return nil, nil, err
 	}
 
+	personIDFromActor, err := fm.NewPersonID(person.ID.GetLink().String(), string(federationHost.NodeInfo.SoftwareName))
+	if err != nil {
+		return nil, nil, err
+	}
 	email := fmt.Sprintf("f%v@%v", uuid.New().String(), localFqdn.Hostname())
-	loginName := personID.AsLoginName()
-	name := fmt.Sprintf("@%v%v", person.PreferredUsername.String(), personID.HostSuffix())
+	loginName := personIDFromActor.AsLoginName()
+	name := fmt.Sprintf("@%v%v", person.PreferredUsername.String(), personIDFromActor.HostSuffix())
 	fullName := person.Name.String()
 
 	if len(person.Name) == 0 {
@@ -190,7 +211,7 @@ func fetchUserFromAP(ctx context.Context, personID fm.PersonID, federationHostID
 		return nil, nil, err
 	}
 
-	newUser := user.User{
+	newUser := user_model.User{
 		LowerName:                    strings.ToLower(name),
 		Name:                         name,
 		FullName:                     fullName,
@@ -201,15 +222,15 @@ func fetchUserFromAP(ctx context.Context, personID fm.PersonID, federationHostID
 		Salt:                         "",
 		PasswdHashAlgo:               "",
 		LoginName:                    loginName,
-		Type:                         user.UserTypeActivityPubUser,
+		Type:                         user_model.UserTypeActivityPubUser,
 		IsAdmin:                      false,
 	}
 
-	federatedUser := user.FederatedUser{
-		ExternalID:            personID.ID,
-		FederationHostID:      federationHostID,
+	federatedUser := user_model.FederatedUser{
+		ExternalID:            personIDFromActor.ID,
+		FederationHostID:      federationHost.ID,
 		InboxPath:             inbox.Path,
-		NormalizedOriginalURL: personID.AsURI(),
+		NormalizedOriginalURL: personIDFromActor.AsURI(),
 		KeyID: sql.NullString{
 			String: person.PublicKey.ID.String(),
 			Valid:  true,
@@ -220,20 +241,6 @@ func fetchUserFromAP(ctx context.Context, personID fm.PersonID, federationHostID
 		},
 	}
 
-	log.Info("Fetched person's %q federatedUser from distant server: %q", person, federatedUser)
+	log.Trace("Fetched person's %v federatedUser from distant server: %s", person, federatedUser.LogString())
 	return &newUser, &federatedUser, nil
 }
-
-func createUserFromAP(ctx context.Context, personID fm.PersonID, federationHostID int64) (*user.User, *user.FederatedUser, error) {
-	newUser, federatedUser, err := fetchUserFromAP(ctx, personID, federationHostID)
-	if err != nil {
-		return nil, nil, err
-	}
-	err = user.CreateFederatedUser(ctx, newUser, federatedUser)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	log.Info("Created federatedUser: %q", federatedUser)
-	return newUser, federatedUser, nil
-}

services/federation/signature_service.go

@@ -82,11 +82,6 @@ func FindOrCreateFederatedUserKey(ctx context.Context, keyID string) (pubKey any
 		if err != nil {
 			return nil, err
 		}
-	} else {
-		_, err = forgefed.GetFederationHost(ctx, federatedUser.FederationHostID)
-		if err != nil {
-			return nil, err
-		}
 	}
 
 	if federatedUser.PublicKey.Valid {

templates/base/head.tmpl

@@ -19,6 +19,9 @@
 {{end}}
 	<link rel="icon" href="{{AssetUrlPrefix}}/img/favicon.svg" type="image/svg+xml">
 	<link rel="alternate icon" href="{{AssetUrlPrefix}}/img/favicon.png" type="image/png">
+{{if and FederationEnabled .PageIsUserProfile .ContextUser .ContextUser.IsIndividual}}
+	<link rel="alternate" type="application/activity+json" href="{{.ContextUser.APActorID}}">
+{{end}}
 	{{template "base/head_script" .}}
 	{{template "shared/user/mention_highlight" .}}
 	{{template "base/head_opengraph" .}}

templates/swagger/v1_json.tmpl

@@ -19583,6 +19583,38 @@
         }
       }
     },
+    "/user/activitypub/follow": {
+      "post": {
+        "tags": [
+          "user"
+        ],
+        "summary": "Follow a remote activitypub account",
+        "operationId": "userCurrentActivityPubFollow",
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "schema": {
+              "$ref": "#/definitions/APRemoteFollowOption"
+            }
+          }
+        ],
+        "responses": {
+          "204": {
+            "$ref": "#/responses/empty"
+          },
+          "401": {
+            "$ref": "#/responses/unauthorized"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          }
+        }
+      }
+    },
     "/user/applications/oauth2": {
       "get": {
         "produces": [
@@ -22279,6 +22311,16 @@
       },
       "x-go-package": "forgejo.org/services/context"
     },
+    "APRemoteFollowOption": {
+      "type": "object",
+      "properties": {
+        "target": {
+          "type": "string",
+          "x-go-name": "Target"
+        }
+      },
+      "x-go-package": "forgejo.org/modules/structs"
+    },
     "AccessToken": {
       "type": "object",
       "title": "AccessToken represents an API access token.",

templates/user/dashboard/ap_feed.tmpl

@@ -0,0 +1,26 @@
+<div id="activity-feed" class="flex-list">
+	{{range .FollowingFeeds}}
+		<div class="flex-item">
+			{{if not (eq .Actor.ID 0)}}
+				<div class="flex-item-leading">
+					{{ctx.AvatarUtils.Avatar . 48}}
+				</div>
+			{{end}}
+			<div class="flex-item-main">
+				<div class="flex-item-title">
+					<a class="text muted" href="{{.ActorURI}}">{{.Actor.Name}}</a>
+				</div>
+				<div class="render-content markup">
+					{{.NoteContent | SanitizeHTMLStrict}}
+				</div>
+				{{if .NoteURL}}
+					<div class="flex-item-footer">
+						<span class="flex-text-inline">{{svg "octicon-calendar"}}{{ctx.Locale.Tr "user.activitypub_feed.posted_on" (DateUtils.TimeSince .Created)}}</span>
+						<a class="flex-text-inline" href="{{.NoteURL}}">{{svg "octicon-link-external"}}{{ctx.Locale.Tr "user.activitypub_feed.original_source"}}</a>
+					</div>
+				{{end}}
+			</div>
+		</div>
+	{{end}}
+	{{template "base/paginate" .}}
+</div>

templates/user/dashboard/ap_feed_guide.tmpl

@@ -0,0 +1,6 @@
+<div id="empty-ap-feed" class="tw-text-center tw-p-8">
+	{{svg "octicon-people" 64 "tw-text-placeholder-text"}}
+	<h2>{{ctx.Locale.Tr "user.activitypub_feed.no_activity"}}</h2>
+	<p class="help">{{ctx.Locale.Tr "user.activitypub_feed.is_empty"}}</p>
+	<p class="help">{{ctx.Locale.Tr "user.activitypub_feed.hint"}}</p>
+</div>

templates/user/overview/header.tmpl

@@ -41,6 +41,11 @@
 					{{svg "octicon-rss"}} {{ctx.Locale.Tr "user.activity"}}
 				</a>
 			{{end}}
+			{{if and FederationEnabled (eq .SignedUserID .ContextUser.ID)}}
+			<a class="{{if eq .TabName "feed"}}active {{end}}item" href="{{.ContextUser.HomeLink}}?tab=feed">
+				{{svg "fediverse-small"}} {{ctx.Locale.Tr "user.activitypub_feed.feed"}}
+			</a>
+			{{end}}
 			{{if not .DisableStars}}
 			<a class="{{if eq .TabName "stars"}}active {{end}}item" href="{{.ContextUser.HomeLink}}?tab=stars">
 				{{svg "octicon-star"}} {{ctx.Locale.Tr "user.starred"}}

templates/user/profile.tmpl

@@ -58,6 +58,14 @@
 						{{.ProfileReadme}}
 					{{end}}
 					</div>
+				{{else if and FederationEnabled (eq .TabName "feed")}}
+					{{if eq .SignedUserID .ContextUser.ID}}
+						{{if .FollowingFeeds}}
+							{{template "user/dashboard/ap_feed" .}}
+						{{else}}
+							{{template "user/dashboard/ap_feed_guide" .}}
+						{{end}}
+					{{end}}
 				{{else}}
 					{{template "shared/repo_search" .}}
 					{{template "explore/repo_list" .}}

tests/integration/api_activitypub_person_inbox_follow_test.go

@@ -10,6 +10,7 @@ import (
 	"testing"
 	"time"
 
+	"forgejo.org/models/db"
 	"forgejo.org/models/unittest"
 	user_model "forgejo.org/models/user"
 	"forgejo.org/modules/activitypub"
@@ -26,7 +27,6 @@ import (
 // Flow of this test is documented at: https://codeberg.org/forgejo-contrib/federation/src/branch/main/doc/user-activity-following.md
 func TestActivityPubPersonInboxFollow(t *testing.T) {
 	defer test.MockVariableValue(&setting.Federation.Enabled, true)()
-	defer test.MockVariableValue(&setting.Federation.SignatureEnforced, false)()
 	defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
 
 	federation.Init()
@@ -40,6 +40,7 @@ func TestActivityPubPersonInboxFollow(t *testing.T) {
 
 		distantURL := federatedSrv.URL
 		distantUser15URL := fmt.Sprintf("%s/api/v1/activitypub/user-id/15", distantURL)
+		distantUser15AliasURL := fmt.Sprintf("%s/api/v1/activitypub/user-id/alias15", distantURL)
 
 		localUser := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
 		localUser2URL := localUrl.JoinPath("/api/v1/activitypub/user-id/2").String()
@@ -52,14 +53,16 @@ func TestActivityPubPersonInboxFollow(t *testing.T) {
 			`{"type":"Follow",`+
 				`"actor":"%s",`+
 				`"object":"%s"}`,
-			distantUser15URL,
+			distantUser15AliasURL,
 			localUser2URL,
 		)
+
 		cf, err := activitypub.NewClientFactoryWithTimeout(60 * time.Second)
 		require.NoError(t, err)
-		c, err := cf.WithKeysDirect(ctx, mock.ApActor.PrivKey,
-			mock.ApActor.KeyID(federatedSrv.URL))
+
+		c, err := cf.WithKeysDirect(ctx, mock.ApActor.PrivKey, mock.ApActor.KeyID(federatedSrv.URL))
 		require.NoError(t, err)
+
 		resp, err := c.Post(followActivity, localUser2Inbox)
 		require.NoError(t, err)
 		assert.Equal(t, http.StatusAccepted, resp.StatusCode)
@@ -94,9 +97,12 @@ func TestActivityPubPersonInboxFollow(t *testing.T) {
 			distantUser15URL,
 			localUser2URL,
 		)
+
 		c, err = cf.WithKeysDirect(ctx, mock.ApActor.PrivKey,
 			mock.ApActor.KeyID(federatedSrv.URL))
+
 		require.NoError(t, err)
+
 		resp, err = c.Post(undoFollowActivity, localUser2Inbox)
 		require.NoError(t, err)
 		assert.Equal(t, http.StatusNoContent, resp.StatusCode)
@@ -110,3 +116,44 @@ func TestActivityPubPersonInboxFollow(t *testing.T) {
 		)
 	})
 }
+
+func TestActivityPubFollowRefollow(t *testing.T) {
+	defer test.MockVariableValue(&setting.Federation.Enabled, true)()
+	defer test.MockVariableValue(&setting.Federation.SignatureEnforced, false)()
+	defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
+
+	require.NoError(t, federation.Init())
+
+	mock := test.NewFederationServerMock()
+	federatedSrv := mock.DistantServer(t)
+	defer federatedSrv.Close()
+
+	onApplicationRun(t, func(t *testing.T, localUrl *url.URL) {
+		defer test.MockVariableValue(&setting.AppURL, localUrl.String())()
+
+		distantURL := federatedSrv.URL
+		distantUser15AliasURL := fmt.Sprintf("%s/api/v1/activitypub/user-id/alias15", distantURL)
+
+		localUser := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+		localUser2URL := localUrl.JoinPath("/api/v1/activitypub/user-id/2")
+		localUser2Inbox := localUrl.JoinPath("/api/v1/activitypub/user-id/2/inbox")
+
+		ctx := t.Context()
+
+		var follow user_model.FederatedUserFollower
+		has, err := db.GetEngine(ctx).Get(&follow)
+		require.NoError(t, err)
+		assert.False(t, has)
+
+		require.NoError(t, mock.FollowActorUnsigned(federatedSrv.URL, 15, *localUser2URL, *localUser2Inbox))
+
+		has, err = db.GetEngine(ctx).Get(&follow)
+		require.NoError(t, err)
+		assert.True(t, has)
+		assert.Equal(t, int64(2), follow.FollowedUserID)
+
+		apiCtx, _ := contexttest.MockAPIContext(t, localUser2Inbox.String())
+		err = federation.FollowRemoteActor(apiCtx, localUser, distantUser15AliasURL)
+		require.NoError(t, err)
+	})
+}

tests/integration/api_activitypub_person_inbox_useractivity_test.go

@@ -10,6 +10,7 @@ import (
 	"testing"
 	"time"
 
+	"forgejo.org/models/activities"
 	auth_model "forgejo.org/models/auth"
 	"forgejo.org/models/unittest"
 	user_model "forgejo.org/models/user"
@@ -26,9 +27,80 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+func TestActivityPubPersonInboxNoteFromDistant(t *testing.T) {
+	defer test.MockVariableValue(&setting.Federation.Enabled, true)()
+	defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
+
+	federation.Init()
+
+	mock := test.NewFederationServerMock()
+	federatedSrv := mock.DistantServer(t)
+	defer federatedSrv.Close()
+
+	onApplicationRun(t, func(t *testing.T, localUrl *url.URL) {
+		defer test.MockVariableValue(&setting.AppURL, localUrl.String())()
+
+		distantURL := federatedSrv.URL
+		distantUser15URL := fmt.Sprintf("%s/api/v1/activitypub/user-id/15", distantURL)
+
+		localUser2 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+		localUser2URL := localUrl.JoinPath("/api/v1/activitypub/user-id/2").String()
+		localUser2Inbox := localUrl.JoinPath("/api/v1/activitypub/user-id/2/inbox").String()
+		localSession2 := loginUser(t, localUser2.LoginName)
+		localSecssion2Token := getTokenForLoggedInUser(t, localSession2, auth_model.AccessTokenScopeWriteUser)
+
+		// view own empty feed on web UI
+		feedPage := NewHTMLParser(t, localSession2.MakeRequest(t, NewRequest(t, "GET", "/user2?tab=feed"), http.StatusOK).Body)
+		feedPage.AssertElement(t, "#empty-ap-feed", true)
+
+		// follow (local follows distant)
+		req := NewRequestWithJSON(t, "POST",
+			"/api/v1/user/activitypub/follow",
+			&structs.APRemoteFollowOption{
+				Target: distantUser15URL,
+			}).
+			AddTokenAuth(localSecssion2Token)
+		MakeRequest(t, req, http.StatusNoContent)
+
+		// send note (distant -> local)
+		distantNoteURL := fmt.Sprintf("%s/api/v1/activitypub/note/104", distantURL)
+
+		userActivity := fmt.Appendf(
+			[]byte{},
+			`{"type":"Create",`+
+				`"actor":"%s",`+
+				`"to": ["https://www.w3.org/ns/activitystreams#Public"],`+
+				`"cc": ["%s"],`+
+				`"object": {"type":"Note","content":"The Content!",`+
+				`"url":"%s"}}`,
+			distantUser15URL,
+			localUser2URL,
+			distantNoteURL,
+		)
+
+		ctx, _ := contexttest.MockAPIContext(t, localUser2Inbox)
+		cf, err := activitypub.NewClientFactoryWithTimeout(60 * time.Second)
+		require.NoError(t, err)
+
+		c, err := cf.WithKeysDirect(ctx, mock.ApActor.PrivKey, mock.ApActor.KeyID(federatedSrv.URL))
+		require.NoError(t, err)
+
+		resp, err := c.Post(userActivity, localUser2Inbox)
+		require.NoError(t, err)
+
+		assert.Equal(t, http.StatusNoContent, resp.StatusCode)
+
+		// check whether user activity exists in local instance
+		unittest.AssertExistsAndLoadBean(t, &activities.FederatedUserActivity{NoteURL: distantNoteURL})
+
+		// view own non-empty feed on web UI
+		feedPage = NewHTMLParser(t, localSession2.MakeRequest(t, NewRequest(t, "GET", "/user2?tab=feed"), http.StatusOK).Body)
+		feedPage.AssertElement(t, "#empty-ap-feed", false)
+	})
+}
+
 func TestActivityPubPersonInboxNoteToDistant(t *testing.T) {
 	defer test.MockVariableValue(&setting.Federation.Enabled, true)()
-	defer test.MockVariableValue(&setting.Federation.SignatureEnforced, false)()
 	defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
 
 	federation.Init()
@@ -60,14 +132,17 @@ func TestActivityPubPersonInboxNoteToDistant(t *testing.T) {
 			distantUser15URL,
 			localUser2URL,
 		)
+
 		ctx, _ := contexttest.MockAPIContext(t, localUser2Inbox)
 		cf, err := activitypub.NewClientFactoryWithTimeout(60 * time.Second)
 		require.NoError(t, err)
-		c, err := cf.WithKeysDirect(ctx, mock.ApActor.PrivKey,
-			mock.ApActor.KeyID(federatedSrv.URL))
+
+		c, err := cf.WithKeysDirect(ctx, mock.ApActor.PrivKey, mock.ApActor.KeyID(federatedSrv.URL))
 		require.NoError(t, err)
+
 		resp, err := c.Post(followActivity, localUser2Inbox)
 		require.NoError(t, err)
+
 		assert.Equal(t, http.StatusAccepted, resp.StatusCode)
 
 		// local action which triggers a user activity
@@ -87,9 +162,11 @@ func TestActivityPubPersonInboxNoteToDistant(t *testing.T) {
 		// distant request activity & activity note
 		localUser2ActivityNote := fmt.Sprintf("%v/activities/1", localUser2URL)
 		localUser2Activity := fmt.Sprintf("%v/activities/1/activity", localUser2URL)
+
 		resp, err = c.Get(localUser2ActivityNote)
 		require.NoError(t, err)
 		assert.Equal(t, http.StatusOK, resp.StatusCode)
+
 		resp, err = c.Get(localUser2Activity)
 		require.NoError(t, err)
 		assert.Equal(t, http.StatusOK, resp.StatusCode)

tests/integration/api_user_follow_federation_test.go

@@ -0,0 +1,55 @@
+// Copyright 2025 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package integration
+
+import (
+	"fmt"
+	"net/http"
+	"testing"
+
+	auth_model "forgejo.org/models/auth"
+	"forgejo.org/models/forgefed"
+	"forgejo.org/models/unittest"
+	"forgejo.org/models/user"
+	"forgejo.org/modules/setting"
+	"forgejo.org/modules/structs"
+	"forgejo.org/modules/test"
+	"forgejo.org/routers"
+	"forgejo.org/tests"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestActivityPubFollowFederated(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+	defer test.MockVariableValue(&setting.Federation.Enabled, true)()
+	defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
+
+	mock := test.NewFederationServerMock()
+	federatedSrv := mock.DistantServer(t)
+	defer federatedSrv.Close()
+
+	localUser10Name := "user10"
+	localSession10 := loginUser(t, localUser10Name)
+	localSecssion10Token := getTokenForLoggedInUser(t, localSession10, auth_model.AccessTokenScopeWriteUser)
+
+	distantURL := federatedSrv.URL
+	distantUser15URL := fmt.Sprintf("%s/api/v1/activitypub/user-id/15", distantURL)
+
+	// local user follow distant
+	req := NewRequestWithJSON(t, "POST",
+		"/api/v1/user/activitypub/follow",
+		&structs.APRemoteFollowOption{
+			Target: distantUser15URL,
+		}).
+		AddTokenAuth(localSecssion10Token)
+	MakeRequest(t, req, http.StatusNoContent)
+
+	// check: federated actors now exist local
+	federationHost := unittest.AssertExistsAndLoadBean(t, &forgefed.FederationHost{HostFqdn: "127.0.0.1"})
+	unittest.AssertExistsAndLoadBean(t, &user.FederatedUser{ExternalID: "15", FederationHostID: federationHost.ID})
+
+	// check: follow request arrived at distant
+	assert.Contains(t, mock.LastPost, "\"object\":\"http://DISTANT_FEDERATION_HOST/api/v1/activitypub/user-id/15\"")
+}

tests/integration/federation_home_template_test.go

@@ -0,0 +1,53 @@
+// Copyright 2026 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package integration
+
+import (
+	"net/http"
+	"testing"
+
+	"forgejo.org/modules/setting"
+	"forgejo.org/modules/test"
+	"forgejo.org/routers"
+	"forgejo.org/tests"
+
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/net/html"
+)
+
+func getLinks(t *testing.T, url string) []*html.Node {
+	req := NewRequest(t, "GET", url)
+	resp := MakeRequest(t, req, http.StatusOK)
+
+	htmlDoc := NewHTMLParser(t, resp.Body)
+	links := htmlDoc.doc.Find("link[type=\"application/activity+json\"]").Nodes
+
+	return links
+}
+
+func TestFederationBaseHead(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+	defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
+
+	t.Run("Federation disabled", func(t *testing.T) {
+		defer test.MockVariableValue(&setting.Federation.Enabled, false)()
+
+		links := getLinks(t, "/user1")
+		assert.Empty(t, links)
+	})
+
+	t.Run("Federation enabled", func(t *testing.T) {
+		defer test.MockVariableValue(&setting.Federation.Enabled, true)()
+
+		links := getLinks(t, "/user1")
+		assert.Len(t, links, 1)
+	})
+
+	t.Run("Organization", func(t *testing.T) {
+		defer test.MockVariableValue(&setting.Federation.Enabled, true)()
+
+		links := getLinks(t, "/org3")
+		assert.Empty(t, links)
+	})
+}

web_src/svg/fediverse-small.svg

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="24"
+   height="24"
+   viewBox="0 0 6.3499999 6.35"
+   version="1.1"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <metadata
+    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+    xmlns:cc="http://creativecommons.org/ns#"
+    xmlns:dc="http://purl.org/dc/elements/1.1/"
+  >
+    <rdf:RDF>
+      <cc:Work rdf:about="https://codeberg.org/forgejo/forgejo/src/web_src/svg/fediverse-small.svg">
+        <dc:title>Forgejo small Fediverse icon</dc:title>
+        <cc:attributionName>The Forgejo Authors</cc:attributionName>
+        <cc:license>MIT</cc:license>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <path
+     style="stroke-linecap:round"
+     d="M 3.5898438,1.1601562 A 0.203686,0.203686 0 0 0 3.3496094,1.3203125 0.203686,0.203686 0 0 0 3.5078125,1.5605469 c 0.1072344,0.021943 0.2100638,0.054028 0.3085938,0.095703 0.1970601,0.08335 0.3741719,0.2042501 0.5234374,0.3535156 0.2985315,0.2985315 0.4843751,0.7096169 0.484375,1.1660157 0,0.2281995 -0.04751,0.4435652 -0.1308593,0.640625 a 0.203686,0.203686 0 0 0 0.109375,0.2675781 0.203686,0.203686 0 0 0 0.265625,-0.109375 C 5.1724517,3.7285087 5.2304688,3.4590205 5.2304687,3.1757813 5.2304687,2.6093024 5.0006974,2.0924942 4.6289062,1.7207031 4.4430106,1.5348075 4.2207091,1.3853417 3.9746094,1.28125 3.8515589,1.2292038 3.7237416,1.1875557 3.5898438,1.1601562 Z M 1.546875,2.265625 A 0.203686,0.203686 0 0 0 1.28125,2.375 C 1.1771594,2.6210999 1.1191406,2.8925415 1.1191406,3.1757813 c 0,0.5664787 0.2297714,1.0813338 0.6015625,1.4531249 0.1858956,0.1858957 0.408197,0.3353614 0.6542969,0.4394532 0.1230501,0.052046 0.2528205,0.093694 0.3867188,0.1210937 A 0.203686,0.203686 0 0 0 3.0019531,5.03125 0.203686,0.203686 0 0 0 2.8417969,4.7890625 C 2.7345627,4.7671193 2.6317332,4.7350342 2.5332031,4.6933594 2.3361428,4.6100096 2.1590312,4.4891093 2.0097656,4.3398437 1.7112341,4.0413123 1.5273438,3.6321799 1.5273437,3.1757813 c 0,-0.2281991 0.045557,-0.4455169 0.1289063,-0.6425782 A 0.203686,0.203686 0 0 0 1.546875,2.265625 Z"
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+  <path
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