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

1 files changed, 19 insertions, 3 deletions

diff --git a/app/services/unfavourite_service.rb b/app/services/unfavourite_service.rb
index 564aaee46..e53798e66 100644
--- a/app/services/unfavourite_service.rb
+++ b/app/services/unfavourite_service.rb
@@ -4,14 +4,30 @@ class UnfavouriteService < BaseService
   def call(account, status)
     favourite = Favourite.find_by!(account: account, status: status)
     favourite.destroy!
-
-    NotificationWorker.perform_async(build_xml(favourite), account.id, status.account_id) unless status.local?
-
+    create_notification(favourite) unless status.local?
     favourite
   end
 
   private
 
+  def create_notification(favourite)
+    status = favourite.status
+
+    if status.account.ostatus?
+      NotificationWorker.perform_async(build_xml(favourite), favourite.account_id, status.account_id)
+    elsif status.account.activitypub?
+      ActivityPub::DeliveryWorker.perform_async(build_json(favourite), favourite.account_id, status.account.inbox_url)
+    end
+  end
+
+  def build_json(favourite)
+    ActiveModelSerializers::SerializableResource.new(
+      favourite,
+      serializer: ActivityPub::UndoLikeSerializer,
+      adapter: ActivityPub::Adapter
+    ).to_json
+  end
+
   def build_xml(favourite)
     OStatus::AtomSerializer.render(OStatus::AtomSerializer.new.unfavourite_salmon(favourite))
   end