atom: provide 'xml:base' attribute for relative path resolution (#12559)

corbo/views.py

@@ -10,7 +10,7 @@ from django.views.generic import CreateView, UpdateView, DeleteView, \
 from django.contrib.syndication.views import Feed
 from django.shortcuts import resolve_url
 from django.utils.encoding import force_text
-from django.utils.feedgenerator import Atom1Feed
+from django.utils.feedgenerator import Atom1Feed as DjangoAtom1Feed
 from django.utils.http import urlencode
 from django.http import HttpResponseRedirect, HttpResponse, Http404
 from django.contrib.auth import logout as auth_logout
@@ -157,6 +157,13 @@ class ManageView(ListView):
 
 manage = ManageView.as_view()
 
+class Atom1Feed(DjangoAtom1Feed):
+    def root_attributes(self):
+        attrs = super(Atom1Feed, self).root_attributes()
+        attrs.update({'xml:base': self.feed['link']})
+        return attrs
+
+
 class AtomView(Feed):
     title = settings.RSS_TITLE
     description = settings.RSS_DESCRIPTION