activitypub: splice in the child object if we have one

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -95,7 +95,7 @@ def insert(map, local \\ true) when is_map(map) do
          :ok <- check_actor_is_active(map["actor"]),
          {_, true} <- {:remote_limit_error, check_remote_limit(map)},
          {:ok, map} <- MRF.filter(map),
-         :ok <- insert_full_object(map) do
+         {:ok, object} <- insert_full_object(map) do
       {recipients, _, _} = get_recipients(map)
 
       {:ok, activity} =
@@ -106,6 +106,14 @@ def insert(map, local \\ true) when is_map(map) do
           recipients: recipients
         })
 
+      # Splice in the child object if we have one.
+      activity =
+        if !is_nil(object) do
+          Map.put(activity, :object, object)
+        else
+          activity
+        end
+
       Task.start(fn ->
         Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity)
       end)

lib/pleroma/web/activity_pub/utils.ex

@@ -209,12 +209,12 @@ def lazy_put_object_defaults(map, activity \\ %{}) do
   """
   def insert_full_object(%{"object" => %{"type" => type} = object_data})
       when is_map(object_data) and type in @supported_object_types do
-    with {:ok, _} <- Object.create(object_data) do
+    with {:ok, object} <- Object.create(object_data) do
-      :ok
+      {:ok, object}
     end
   end
 
-  def insert_full_object(_), do: :ok
+  def insert_full_object(_), do: {:ok, nil}
 
   def update_object_in_activities(%{data: %{"id" => id}} = object) do
     # TODO