Add prefix URI for notifications in context data (#2440)

* Add prefix URI for notifications in context data

This adds context data for constructing full URIs.

* Lint fix

Author: agjohnson

readthedocs/notifications/notification.py

@@ -30,6 +30,9 @@ def get_context_data(self):
         return {
             self.context_object_name: self.object,
             'request': self.request,
+            'production_uri': '{scheme}://{host}'.format(
+                scheme='https', host=settings.PRODUCTION_DOMAIN
+            )
         }
 
     def get_template_names(self, backend_name, source_format=HTML):

readthedocs/rtd_tests/tests/test_notifications.py

@@ -37,7 +37,9 @@ class TestNotification(Notification):
         self.assertEqual(notify.get_subject(),
                          'This is {0}'.format(build.id))
         self.assertEqual(notify.get_context_data(),
-                         {'foo': build, 'request': req})
+                         {'foo': build,
+                          'production_uri': 'https://readthedocs.org',
+                          'request': req})
 
         notify.render('site')
         render_to_string.assert_has_calls([