Teach CQ status app to check login status of users.

appengine/chromium_cq_status/handlers/stats_data_points.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import webapp2
 
 from model.cq_stats import CQStats
-from shared.utils import cross_origin_json
+from shared import utils
+
 
 class StatsDataPoints(webapp2.RequestHandler):
-  @cross_origin_json
+  @utils.cross_origin_json
+  @utils.read_access
   def get(self, ranking, name, cq_stats_key): # pylint: disable=R0201
     cq_stats = CQStats.get_by_id(int(cq_stats_key))
     assert cq_stats, '%s must match a CQStats entry.' % cq_stats_key
     for stats in cq_stats.count_stats + cq_stats.list_stats:
       if stats.name == name:
         if ranking == 'lowest':
           return stats.lowest_100
         assert ranking == 'highest'
         return stats.highest_100
     assert False, '%s must match a stat in the specified CQStats entry.' % name