Open Source Monorail

appengine/monorail/sitewide/custom_404.py

Index: appengine/monorail/sitewide/custom_404.py
diff --git a/appengine/monorail/sitewide/custom_404.py b/appengine/monorail/sitewide/custom_404.py
new file mode 100644
index 0000000000000000000000000000000000000000..29b1a3fbe67641ece15a7f4360038b1a55343dda
--- /dev/null
+++ b/appengine/monorail/sitewide/custom_404.py
@@ -0,0 +1,36 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is govered by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+"""Page class for generating somewhat informative project-page 404s.
+
+This page class produces a mostly-empty project subpage, which helps
+users find what they're looking for, rather than telling them
+"404. That's an error. That's all we know." which is maddeningly not
+helpful when we already have a project pb loaded.
+"""
+
+from framework import monorailrequest
+from framework import servlet
+
+
+class ErrorPage(servlet.Servlet):
+  """Page class for generating somewhat informative project-page 404s.
+
+  This page class produces a mostly-empty project subpage, which helps
+  users find what they're looking for, rather than telling them
+  "404. That's an error. That's all we know." which is maddeningly not
+  helpful when we already have a project pb loaded.
+  """
+
+  _PAGE_TEMPLATE = 'sitewide/project-404-page.ezt'
+
+  def get(self, **kwargs):
+    servlet.Servlet.get(self, **kwargs)
+
+  def GatherPageData(self, mr):
+    """Build up a dictionary of data values to use when rendering the page."""
+    if not mr.project_name:
+      raise monorailrequest.InputException('No project specified')
+    return {}