activitypub: implement /api/v1/activitypub/user/{username} (#14186)

Return informations regarding a Person (as defined in ActivityStreams
https://www.w3.org/TR/activitystreams-vocabulary/#dfn-person).

Refs: https://github.com/go-gitea/gitea/issues/14186

Signed-off-by: Loïc Dachary <loic@dachary.org>

routers/api/v1/activitypub/person.go

@@ -0,0 +1,62 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activitypub
+
+import (
+	"net/http"
+	"net/url"
+	"strings"
+
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/routers/api/v1/user"
+	"github.com/go-fed/activity/streams"
+)
+
+func Person(ctx *context.APIContext) {
+	// swagger:operation GET /activitypub/user/{username} information
+	// ---
+	// summary: Returns the person
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: username
+	//   in: path
+	//   description: username of the user
+	//   type: string
+	//   required: true
+	// responses:
+	//   "200":
+	//     "$ref": "#/responses/ActivityPub"
+
+	user.GetUserByParamsName(ctx, "username")
+	username := ctx.Params("username")
+
+	person := streams.NewActivityStreamsPerson()
+
+	id := streams.NewJSONLDIdProperty()
+	link := strings.TrimSuffix(setting.AppURL, "/") + strings.TrimSuffix(ctx.Req.URL.EscapedPath(), "/")
+	url_object, _ := url.Parse(link)
+	id.SetIRI(url_object)
+	person.SetJSONLDId(id)
+
+	name := streams.NewActivityStreamsNameProperty()
+	name.AppendXMLSchemaString(username)
+	person.SetActivityStreamsName(name)
+
+	ibox := streams.NewActivityStreamsInboxProperty()
+	url_object, _ = url.Parse(link + "/inbox")
+	ibox.SetIRI(url_object)
+	person.SetActivityStreamsInbox(ibox)
+
+	obox := streams.NewActivityStreamsOutboxProperty()
+	url_object, _ = url.Parse(link + "/outbox")
+	obox.SetIRI(url_object)
+	person.SetActivityStreamsOutbox(obox)
+
+	var jsonmap map[string]interface{}
+	jsonmap, _ = streams.Serialize(person)
+	ctx.JSON(http.StatusOK, jsonmap)
+}

routers/api/v1/api.go

@@ -79,6 +79,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/web"
+	"code.gitea.io/gitea/routers/api/v1/activitypub"
 	"code.gitea.io/gitea/routers/api/v1/admin"
 	"code.gitea.io/gitea/routers/api/v1/misc"
 	"code.gitea.io/gitea/routers/api/v1/notify"
@@ -597,6 +598,11 @@ func Routes(sessioner func(http.Handler) http.Handler) *web.Route {
 		m.Get("/version", misc.Version)
 		if setting.Federation.Enabled {
 			m.Get("/nodeinfo", misc.NodeInfo)
+			m.Group("/activitypub", func() {
+				m.Group("/user/{username}", func() {
+					m.Get("", activitypub.Person)
+				})
+			})
 		}
 		m.Get("/signing-key.gpg", misc.SigningKey)
 		m.Post("/markdown", bind(api.MarkdownOption{}), misc.Markdown)

routers/api/v1/swagger/activitypub.go

@@ -0,0 +1,16 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package swagger
+
+import (
+	api "code.gitea.io/gitea/modules/structs"
+)
+
+// ActivityPub
+// swagger:response ActivityPub
+type swaggerResponseActivityPub struct {
+	// in:body
+	Body api.ActivityPub `json:"body"`
+}