Merge pull request 'Implement an instance-wide activitypub actor' (#4811) from algernon/forgejo:to-be-or-not-to-be into forgejo

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/4811
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>

tests/integration/api_activitypub_actor_test.go

@@ -0,0 +1,50 @@
+// Copyright 2024 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package integration
+
+import (
+	"net/http"
+	"net/url"
+	"testing"
+
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/test"
+	"code.gitea.io/gitea/routers"
+
+	ap "github.com/go-ap/activitypub"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestActivityPubActor(t *testing.T) {
+	defer test.MockVariableValue(&setting.Federation.Enabled, true)()
+	defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
+
+	onGiteaRun(t, func(*testing.T, *url.URL) {
+		req := NewRequest(t, "GET", "/api/v1/activitypub/actor")
+		resp := MakeRequest(t, req, http.StatusOK)
+		body := resp.Body.Bytes()
+		assert.Contains(t, string(body), "@context")
+
+		var actor ap.Actor
+		err := actor.UnmarshalJSON(body)
+		require.NoError(t, err)
+
+		assert.Equal(t, ap.ApplicationType, actor.Type)
+		assert.Equal(t, setting.Domain, actor.PreferredUsername.String())
+		keyID := actor.GetID().String()
+		assert.Regexp(t, "activitypub/actor$", keyID)
+		assert.Regexp(t, "activitypub/actor/outbox$", actor.Outbox.GetID().String())
+		assert.Regexp(t, "activitypub/actor/inbox$", actor.Inbox.GetID().String())
+
+		pubKey := actor.PublicKey
+		assert.NotNil(t, pubKey)
+		publicKeyID := keyID + "#main-key"
+		assert.Equal(t, pubKey.ID.String(), publicKeyID)
+
+		pubKeyPem := pubKey.PublicKeyPem
+		assert.NotNil(t, pubKeyPem)
+		assert.Regexp(t, "^-----BEGIN PUBLIC KEY-----", pubKeyPem)
+	})
+}