Switch protocols to AP when post come in through AP.

lib/pleroma/user.ex

@@ -427,5 +427,5 @@ def insert_or_update_user(data) do
     Repo.insert(cs, on_conflict: :replace_all, conflict_target: :nickname)
   end
 
-  def ap_enabled?(%User{info: %{"ap_enabled" => ap}}), do: ap
+  def ap_enabled?(%User{info: info}), do: info["ap_enabled"]
 end

lib/pleroma/web/activity_pub/activity_pub_controller.ex

@@ -23,13 +23,23 @@ def object(conn, %{"uuid" => uuid}) do
   # TODO: Ensure that this inbox is a recipient of the message
   def inbox(%{assigns: %{valid_signature: true}} = conn, params) do
     # File.write("/tmp/incoming.json", Poison.encode!(params))
-    with {:ok, activity} <- Transmogrifier.handle_incoming(params) do
+    with {:ok, _user} <- ap_enabled_actor(params["actor"]),
+         {:ok, activity} <- Transmogrifier.handle_incoming(params) do
       json(conn, "ok")
     else
       e -> IO.inspect(e)
     end
   end
 
+  def ap_enabled_actor(id) do
+    user = User.get_by_ap_id(id)
+    if User.ap_enabled?(user) do
+      {:ok, user}
+    else
+      ActivityPub.make_user_from_ap_id(id)
+    end
+  end
+
   def errors(conn, _e) do
     conn
     |> put_status(500)