--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/soc/middleware/maintenance.py	Sat Sep 12 01:06:37 2009 +0200
@@ -0,0 +1,78 @@
+#!/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 exceptions.
+"""
+
+__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):
+    context = responses.getUniversalContext(request)
+
+    if not context['is_admin'] and context['in_maintenance']:
+      return self.maintenance(request)
+
+  def process_exception(self, request, exception):
+    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