From 565b8d02c8c1cfaa1276970a75d336a19147589c Mon Sep 17 00:00:00 2001
From: lain <lain@soykaf.club>
Date: Mon, 30 Sep 2019 18:13:05 +0200
Subject: Transmogrifier: Handle compact objects in undos.

---
 lib/pleroma/web/activity_pub/transmogrifier.ex | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'lib')

diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index 350b83abb..ce9ca95cf 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -753,6 +753,24 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
     end
   end
 
+  # For Undos that don't have the complete object attached, try to find it in our database.
+  def handle_incoming(
+        %{
+          "type" => "Undo",
+          "object" => object
+        } = activity,
+        options
+      )
+      when is_binary(object) do
+    with %Activity{data: data} <- Activity.get_by_ap_id(object) do
+      activity
+      |> Map.put("object", data)
+      |> handle_incoming(options)
+    else
+      _e -> :error
+    end
+  end
+
   def handle_incoming(_, _), do: :error
 
   def get_obj_helper(id, options \\ []) do
-- 
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