Allow to dereference Follow object for ActivityPub (#5772)

* Allow to dereference Follow object for ActivityPub

* Accept IRI as object representation for Accept activity

spec/controllers/activitypub/follows_controller_spec.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe ActivityPub::FollowsController, type: :controller do
+  let(:follow_request) { Fabricate(:follow_request, account: account) }
+
+  render_views
+
+  context 'with local account' do
+    let(:account) { Fabricate(:account, domain: nil) }
+
+    it 'returns follow request' do
+      signed_request = Request.new(:get, account_follow_url(account, follow_request))
+      signed_request.on_behalf_of(follow_request.target_account)
+      request.headers.merge! signed_request.headers
+
+      get :show, params: { id: follow_request, account_username: account.username }
+
+      expect(body_as_json[:id]).to eq ActivityPub::TagManager.instance.uri_for(follow_request)
+      expect(response).to have_http_status :success
+    end
+
+    it 'returns http 404 without signature' do
+      get :show, params: { id: follow_request, account_username: account.username }
+      expect(response).to have_http_status 404
+    end
+  end
+
+  context 'with remote account' do
+    let(:account) { Fabricate(:account, domain: Faker::Internet.domain_name) }
+
+    it 'returns http 404' do
+      signed_request = Request.new(:get, account_follow_url(account, follow_request))
+      signed_request.on_behalf_of(follow_request.target_account)
+      request.headers.merge! signed_request.headers
+
+      get :show, params: { id: follow_request, account_username: account.username }
+
+      expect(response).to have_http_status 404
+    end
+  end
+end

spec/lib/activitypub/activity/accept_spec.rb

@@ -3,36 +3,49 @@ require 'rails_helper'
 RSpec.describe ActivityPub::Activity::Accept do
   let(:sender)    { Fabricate(:account) }
   let(:recipient) { Fabricate(:account) }
-
-  let(:json) do
-    {
-      '@context': 'https://www.w3.org/ns/activitystreams',
-      id: 'foo',
-      type: 'Accept',
-      actor: ActivityPub::TagManager.instance.uri_for(sender),
-      object: {
-        id: 'bar',
-        type: 'Follow',
-        actor: ActivityPub::TagManager.instance.uri_for(recipient),
-        object: ActivityPub::TagManager.instance.uri_for(sender),
-      },
-    }.with_indifferent_access
-  end
+  let!(:follow_request) { Fabricate(:follow_request, account: recipient, target_account: sender) }
 
   describe '#perform' do
     subject { described_class.new(json, sender) }
 
     before do
-      Fabricate(:follow_request, account: recipient, target_account: sender)
       subject.perform
     end
 
-    it 'creates a follow relationship' do
-      expect(recipient.following?(sender)).to be true
+    context 'with concerete object representation' do
+      let(:json) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: 'foo',
+          type: 'Accept',
+          actor: ActivityPub::TagManager.instance.uri_for(sender),
+          object: {
+            type: 'Follow',
+            actor: ActivityPub::TagManager.instance.uri_for(recipient),
+            object: ActivityPub::TagManager.instance.uri_for(sender),
+          },
+        }.with_indifferent_access
+      end
+
+      it 'creates a follow relationship' do
+        expect(recipient.following?(sender)).to be true
+      end
     end
 
-    it 'removes the follow request' do
-      expect(recipient.requested?(sender)).to be false
+    context 'with object represented by id' do
+      let(:json) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: 'foo',
+          type: 'Accept',
+          actor: ActivityPub::TagManager.instance.uri_for(sender),
+          object: ActivityPub::TagManager.instance.uri_for(follow_request),
+        }.with_indifferent_access
+      end
+
+      it 'creates a follow relationship' do
+        expect(recipient.following?(sender)).to be true
+      end
     end
   end
 end

spec/models/follow_request_spec.rb

@@ -27,4 +27,12 @@ RSpec.describe FollowRequest, type: :model do
       expect(follow_request.account.muting_reblogs?(target)).to be true
     end
   end
+
+  describe '#object_type' do
+    let(:follow_request) { Fabricate(:follow_request) }
+
+    it 'equals to :follow' do
+      expect(follow_request.object_type).to eq :follow
+    end
+  end
 end