Ensure actor in Activity is also anonymized

lib/pleroma/web/activity_pub/utils.ex

@@ -887,7 +887,8 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   end
 
   def maybe_anonymize_reporter(%Activity{data: data} = activity) do
-    %Activity{activity | data: maybe_anonymize_reporter(data)}
+    new_data = maybe_anonymize_reporter(data)
+    %Activity{activity | actor: new_data["actor"], data: new_data}
   end
 
   def maybe_anonymize_reporter(activity) do

test/pleroma/web/activity_pub/activity_pub_test.exs

@@ -1738,7 +1738,9 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
           |> put_in(["object"], [target_account.ap_id, object_ap_id])
           |> Map.put("actor", placeholder.ap_id)
 
-        assert_called(Utils.maybe_federate(%{activity | data: new_data}))
+        assert_called(
+          Utils.maybe_federate(%{activity | actor: placeholder.ap_id, data: new_data})
+        )
       end
     end
 

test/pleroma/web/activity_pub/utils_test.exs

@@ -693,6 +693,20 @@ defmodule Pleroma.Web.ActivityPub.UtilsTest do
       assert %{"actor" => placeholder.ap_id} == Utils.maybe_anonymize_reporter(report)
     end
 
+    test "anonymize Activity", %{
+      placeholder: placeholder,
+      reporter: reporter,
+      report: report
+    } do
+      clear_config([:activitypub, :anonymize_reporter], true)
+      clear_config([:activitypub, :anonymize_reporter_local_nickname], placeholder.nickname)
+      report_activity = %Activity{actor: reporter, data: report}
+      anon_id = placeholder.ap_id
+
+      assert %Activity{actor: ^anon_id, data: %{"actor" => ^anon_id}} =
+               Utils.maybe_anonymize_reporter(report_activity)
+    end
+
     test "do not anonymize when disabled", %{
       placeholder: placeholder,
       reporter: reporter,