appengine/monorail/sitewide/custom_404.py

# 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 {}