ActivityPub delivery (#4566)

* Deliver ActivityPub Like

* Deliver ActivityPub Undo-Like

* Deliver ActivityPub Create/Announce activities

* Deliver ActivityPub creates from mentions

* Deliver ActivityPub Block/Undo-Block

* Deliver ActivityPub Accept/Reject-Follow

* Deliver ActivityPub Undo-Follow

* Deliver ActivityPub Follow

* Deliver ActivityPub Delete activities

Incidentally fix #889

* Adjust BatchedRemoveStatusService for ActivityPub

* Add tests for ActivityPub workers

* Add tests for FollowService

* Add tests for FavouriteService, UnfollowService and PostStatusService

* Add tests for ReblogService, BlockService, UnblockService, ProcessMentionsService

* Add tests for AuthorizeFollowService, RejectFollowService, RemoveStatusService

* Add tests for BatchedRemoveStatusService

* Deliver updates to a local account to ActivityPub followers

* Minor adjustments

spec/services/follow_service_spec.rb

@@ -44,9 +44,9 @@ RSpec.describe FollowService do
     end
   end
 
-  context 'remote account' do
+  context 'remote OStatus account' do
     describe 'locked account' do
-      let(:bob) { Fabricate(:user, email: 'bob@example.com', account: Fabricate(:account, locked: true, username: 'bob', domain: 'example.com', salmon_url: 'http://salmon.example.com')).account }
+      let(:bob) { Fabricate(:user, email: 'bob@example.com', account: Fabricate(:account, protocol: :ostatus, locked: true, username: 'bob', domain: 'example.com', salmon_url: 'http://salmon.example.com')).account }
 
       before do
         stub_request(:post, "http://salmon.example.com/").to_return(:status => 200, :body => "", :headers => {})
@@ -66,7 +66,7 @@ RSpec.describe FollowService do
     end
 
     describe 'unlocked account' do
-      let(:bob) { Fabricate(:user, email: 'bob@example.com', account: Fabricate(:account, username: 'bob', domain: 'example.com', salmon_url: 'http://salmon.example.com', hub_url: 'http://hub.example.com')).account }
+      let(:bob) { Fabricate(:user, email: 'bob@example.com', account: Fabricate(:account, protocol: :ostatus, username: 'bob', domain: 'example.com', salmon_url: 'http://salmon.example.com', hub_url: 'http://hub.example.com')).account }
 
       before do
         stub_request(:post, "http://salmon.example.com/").to_return(:status => 200, :body => "", :headers => {})
@@ -91,7 +91,7 @@ RSpec.describe FollowService do
     end
 
     describe 'already followed account' do
-      let(:bob) { Fabricate(:user, email: 'bob@example.com', account: Fabricate(:account, username: 'bob', domain: 'example.com', salmon_url: 'http://salmon.example.com', hub_url: 'http://hub.example.com')).account }
+      let(:bob) { Fabricate(:user, email: 'bob@example.com', account: Fabricate(:account, protocol: :ostatus, username: 'bob', domain: 'example.com', salmon_url: 'http://salmon.example.com', hub_url: 'http://hub.example.com')).account }
 
       before do
         sender.follow!(bob)
@@ -111,4 +111,21 @@ RSpec.describe FollowService do
       end
     end
   end
+
+  context 'remote ActivityPub account' do
+    let(:bob) { Fabricate(:user, account: Fabricate(:account, username: 'bob', domain: 'example.com', protocol: :activitypub, inbox_url: 'http://example.com/inbox')).account }
+
+    before do
+      stub_request(:post, "http://example.com/inbox").to_return(:status => 200, :body => "", :headers => {})
+      subject.call(sender, bob.acct)
+    end
+
+    it 'creates follow request' do
+      expect(FollowRequest.find_by(account: sender, target_account: bob)).to_not be_nil
+    end
+
+    it 'sends a follow activity to the inbox' do
+      expect(a_request(:post, 'http://example.com/inbox')).to have_been_made.once
+    end
+  end
 end