Move the check to the inbox

lib/pleroma/web/activity_pub/activity_pub_controller.ex

@@ -294,6 +294,11 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubController do
   end
 
   def inbox(%{assigns: %{valid_signature: false}} = conn, params) do
+    case unknown_delete?(params) do
+      true ->
+        :ok
+
+      false ->
         Federator.incoming_ap_doc(%{
           method: conn.method,
           req_headers: conn.req_headers,
@@ -301,6 +306,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubController do
           params: params,
           query_string: conn.query_string
         })
+    end
 
     json(conn, "ok")
   end
@@ -558,4 +564,16 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubController do
       |> json(UserView.render("featured.json", %{user: user}))
     end
   end
+
+  defp unknown_delete?(%{
+         "type" => "Delete",
+         "actor" => actor
+       }) do
+    case User.get_cached_by_ap_id(actor) do
+      %User{} -> false
+      _ -> true
+    end
+  end
+
+  defp unknown_delete?(_), do: false
 end

lib/pleroma/workers/receiver_worker.ex

@@ -33,8 +33,7 @@ defmodule Pleroma.Workers.ReceiverWorker do
       query_string: query_string
     }
 
-    with {_, false} <- {:unknown_delete, unknown_delete?(params)},
+    with {:ok, %User{} = _actor} <- User.get_or_fetch_by_ap_id(conn_data.params["actor"]),
-         {:ok, %User{} = _actor} <- User.get_or_fetch_by_ap_id(conn_data.params["actor"]),
          {:ok, _public_key} <- Signature.refetch_public_key(conn_data),
          {:signature, true} <- {:signature, Signature.validate_signature(conn_data)},
          {:ok, res} <- Federator.perform(:incoming_ap_doc, params) do
@@ -73,16 +72,4 @@ defmodule Pleroma.Workers.ReceiverWorker do
       e -> {:error, e}
     end
   end
-
-  defp unknown_delete?(%{
-         "type" => "Delete",
-         "actor" => actor
-       }) do
-    case User.get_cached_by_ap_id(actor) do
-      %User{} -> false
-      _ -> true
-    end
-  end
-
-  defp unknown_delete?(_), do: false
 end