Restrict reblogs of activities from blocked domains

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -752,6 +752,14 @@ defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do
 
     from(
       activity in query,
+      inner_join: o in Object,
+      on:
+        fragment(
+          "(?->>'id') = COALESCE(?->'object'->>'id', ?->>'object')",
+          o.data,
+          activity.data,
+          activity.data
+        ),
       where: fragment("not (? = ANY(?))", activity.actor, ^blocks),
       where: fragment("not (? && ?)", activity.recipients, ^blocks),
       where:
@@ -761,7 +769,8 @@ defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do
           activity.data,
           ^blocks
         ),
-      where: fragment("not (split_part(?, '/', 3) = ANY(?))", activity.actor, ^domain_blocks)
+      where: fragment("not (split_part(?, '/', 3) = ANY(?))", activity.actor, ^domain_blocks),
+      where: fragment("not (split_part(?->>'actor', '/', 3) = ANY(?))", o.data, ^domain_blocks)
     )
   end
 

test/web/activity_pub/activity_pub_test.exs

@@ -474,6 +474,15 @@ test "doesn't return activities from blocked domains" do
       ActivityPub.fetch_activities([], %{"blocking_user" => user, "skip_preload" => true})
 
     refute activity in activities
+
+    followed_user = insert(:user)
+    ActivityPub.follow(user, followed_user)
+    {:ok, repeat_activity, _} = CommonAPI.repeat(activity.id, followed_user)
+
+    activities =
+      ActivityPub.fetch_activities([], %{"blocking_user" => user, "skip_preload" => true})
+
+    refute repeat_activity in activities
   end
 
   test "doesn't return muted activities" do