Handle unrepeats via the TwitterAPI

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -12,6 +12,18 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
     CommonAPI.post(user, data)
   end
 
+  def delete(%User{} = user, id) do
+    # TwitterAPI does not have an "unretweet" endpoint; instead this is done
+    # via the "destroy" endpoint.  Therefore, there is a need to handle
+    # when the status to "delete" is actually an Announce (repeat) object.
+    with %Activity{data: %{"type" => type}} <- Repo.get(Activity, id) do
+      case type do
+        "Announce" -> unrepeat(user, id)
+        _ -> CommonAPI.delete(id, user)
+      end
+    end
+  end
+
   def follow(%User{} = follower, params) do
     with {:ok, %User{} = followed} <- get_user(params),
          {:ok, follower} <- User.follow(follower, followed),
@@ -64,6 +76,12 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
     end
   end
 
+  defp unrepeat(%User{} = user, ap_id_or_id) do
+    with {:ok, _unannounce, activity, _object} <- CommonAPI.unrepeat(ap_id_or_id, user) do
+      {:ok, activity}
+    end
+  end
+
   def fav(%User{} = user, ap_id_or_id) do
     with {:ok, _announce, %{data: %{"id" => id}}} = CommonAPI.favorite(ap_id_or_id, user),
          %Activity{} = activity <- Activity.get_create_activity_by_object_ap_id(id) do