Embed announce activity data instead of linking to it

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -140,9 +140,14 @@ def announce(
     end
   end
 
-  def unannounce(%User{} = actor, %Object{} = object, local \\ true) do
+  def unannounce(
+        %User{} = actor,
+        %Object{} = object,
+        local \\ true,
+        activity_id \\ nil
+      ) do
     with %Activity{} = activity <- get_existing_announce(actor.ap_id, object),
-         unannounce_data <- make_unannounce_data(actor, activity),
+         unannounce_data <- make_unannounce_data(actor, activity, activity_id),
          {:ok, unannounce_activity} <- insert(unannounce_data, local),
          :ok <- maybe_federate(activity),
          {:ok, _activity} <- Repo.delete(activity),

lib/pleroma/web/activity_pub/utils.ex

@@ -283,16 +283,19 @@ def make_announce_data(
   """
   def make_unannounce_data(
         %User{ap_id: ap_id} = user,
-        %Activity{data: %{"id" => id, "context" => context}} = activity
+        %Activity{data: %{"context" => context}} = activity,
+        activity_id
       ) do
-    %{
+    data = %{
       "type" => "Undo",
       "actor" => ap_id,
-      "object" => id,
+      "object" => activity.data,
       "to" => [user.follower_address, activity.data["actor"]],
       "cc" => ["https://www.w3.org/ns/activitystreams#Public"],
       "context" => context
     }
+
+    if activity_id, do: Map.put(data, "id", activity_id), else: data
   end
 
   def add_announce_to_object(%Activity{data: %{"actor" => actor}}, object) do

test/web/activity_pub/activity_pub_test.exs

@@ -294,7 +294,7 @@ test "unannouncing a previously announced object" do
                announce_activity.data["actor"]
              ]
       assert unannounce_activity.data["type"] == "Undo"
-      assert unannounce_activity.data["object"] == announce_activity.data["id"]
+      assert unannounce_activity.data["object"] == announce_activity.data
       assert unannounce_activity.data["actor"] == user.ap_id
       assert unannounce_activity.data["context"] == announce_activity.data["context"]