Merge branch 'discard-invalid-likes' into 'develop'

Transmogrifier: fix incoming objects with invalid likes

See merge request pleroma/pleroma!724

lib/pleroma/web/activity_pub/transmogrifier.ex

@@ -141,11 +141,11 @@ def fix_actor(%{"attributedTo" => actor} = object) do
     |> Map.put("actor", get_actor(%{"actor" => actor}))
   end
 
-  def fix_likes(%{"likes" => likes} = object)
-      when is_bitstring(likes) do
   # Check for standardisation
   # This is what Peertube does
   # curl -H 'Accept: application/activity+json' $likes | jq .totalItems
+  # Prismo returns only an integer (count) as "likes"
+  def fix_likes(%{"likes" => likes} = object) when not is_map(likes) do
     object
     |> Map.put("likes", [])
     |> Map.put("like_count", 0)