Merge branch '210_twitter_api_uploads_alt_text' into 'develop'

[#210] TwitterAPI: alt text support for uploaded images. Mastodon API uploads security fix.

See merge request pleroma/pleroma!496

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -574,7 +574,14 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
 
   def upload(file, opts \\ []) do
     with {:ok, data} <- Upload.store(file, opts) do
-      Repo.insert(%Object{data: data})
+      obj_data =
+        if opts[:actor] do
+          Map.put(data, "actor", opts[:actor])
+        else
+          data
+        end
+
+      Repo.insert(%Object{data: obj_data})
     end
   end