Teach CQ status app to check login status of users.

appengine/chromium_cq_status/handlers/post.py

Index: appengine/chromium_cq_status/handlers/post.py
diff --git a/appengine/chromium_cq_status/handlers/post.py b/appengine/chromium_cq_status/handlers/post.py
index be873c6428d1829d5409d42b710b5b2bf719e932..d4bd003fbe76db4cf1ef68f3ade4da318d671634 100644
--- a/appengine/chromium_cq_status/handlers/post.py
+++ b/appengine/chromium_cq_status/handlers/post.py
@@ -37,7 +37,7 @@ def update_record(key=None, tags=None, fields=None):
 
 class Post(webapp2.RequestHandler):
   def get(self):
-    if not utils.is_valid_user():
+    if not utils.has_permission('write'):
       self.redirect(users.create_login_url('/'))
       return
 
@@ -52,7 +52,7 @@ class Post(webapp2.RequestHandler):
       self.response.write(e)
 
   def post(self):
-    if not utils.is_valid_user() and not self._is_cq_bot():
+    if not utils.has_permission('write') and not self._is_cq_bot():
       self.response.set_status(403)
       return