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/controllers/api/v1/accounts/credentials_controller_spec.rb

@@ -20,6 +20,8 @@ describe Api::V1::Accounts::CredentialsController do
   describe 'PATCH #update' do
     describe 'with valid data' do
       before do
+        allow(ActivityPub::UpdateDistributionWorker).to receive(:perform_async)
+
         patch :update, params: {
           display_name: "Alice Isn't Dead",
           note: "Hi!\n\nToot toot!",
@@ -40,6 +42,10 @@ describe Api::V1::Accounts::CredentialsController do
         expect(user.account.avatar).to exist
         expect(user.account.header).to exist
       end
+
+      it 'queues up an account update distribution' do
+        expect(ActivityPub::UpdateDistributionWorker).to have_received(:perform_async).with(user.account_id)
+      end
     end
 
     describe 'with invalid data' do