#!/usr/bin/python2.5

#

# Copyright 2009 the Melange authors.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#   http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Middleware to handle maintenance mode.

"""

__authors__ = [

  '"Sverre Rabbelier" <sverre@rabbelier.nl>',

  ]

from google.appengine.runtime.apiproxy_errors import CapabilityDisabledError

from django import http

from django.utils.translation import ugettext

from soc.views.helper import responses

DEF_DOWN_FOR_MAINTENANCE_MSG = ugettext("Down for maintenance")

DEF_IN_UNEXPECTED_MAINTENANCE_MSG = ugettext(

      "Down for unexpected maintenance.")

class MaintenanceMiddleware(object):

  """Middleware to handle maintenance mode.

  """

  def maintenance(self, request):

    """Returns a 'down for maintenance' view.

    """

    context = responses.getUniversalContext(request)

    context['page_name'] = ugettext('Maintenance')

    notice = context.pop('site_notice')

    if not notice:

      context['body_content'] = DEF_IN_UNEXPECTED_MAINTENANCE_MSG

    else:

      context['body_content'] = notice

    context['header_title'] = DEF_DOWN_FOR_MAINTENANCE_MSG

    context['sidebar_menu_items'] = [

        {'heading': DEF_DOWN_FOR_MAINTENANCE_MSG,

         'group': ''},

        ]

    template = 'soc/base.html'

    return responses.respond(request, template, context=context)

  def process_request(self, request):

    """Called when a request is made.

    See the Django middleware documentation for an explanation of

    the method signature.

    """

    context = responses.getUniversalContext(request)

    if not context['is_admin'] and context['in_maintenance']:

      return self.maintenance(request)

  def process_exception(self, request, exception):

    """Called when an uncaught exception is raised.

    See the Django middleware documentation for an explanation of

    the method signature.

    """

    if isinstance(exception, CapabilityDisabledError):

      # assume the site is in maintenance if we get CDE

      return maintenance(request)

    # let the exception handling middleware handle it

    return None