114 lines
4.6 KiB
Python
114 lines
4.6 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Copyright 2012 Nebula, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Middleware provided and used by Horizon.
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"""
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import json
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import logging
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from django import http
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from django import shortcuts
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from django.conf import settings
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from django.contrib import messages as django_messages
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from django.contrib.auth import REDIRECT_FIELD_NAME
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from django.contrib.auth.views import redirect_to_login
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from django.utils import timezone
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from django.utils.encoding import iri_to_uri
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from horizon import exceptions
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LOG = logging.getLogger(__name__)
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class HorizonMiddleware(object):
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""" The main Horizon middleware class. Required for use of Horizon. """
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def process_request(self, request):
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""" Adds data necessary for Horizon to function to the request. """
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# Activate timezone handling
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tz = request.session.get('django_timezone')
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if tz:
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timezone.activate(tz)
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request.horizon = {'dashboard': None,
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'panel': None,
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'async_messages': []}
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def process_exception(self, request, exception):
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"""
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Catches internal Horizon exception classes such as NotAuthorized,
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NotFound and Http302 and handles them gracefully.
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"""
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if isinstance(exception, (exceptions.NotAuthorized,
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exceptions.NotAuthenticated)):
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auth_url = settings.LOGIN_URL
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next_url = iri_to_uri(request.get_full_path())
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if next_url != auth_url:
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field_name = REDIRECT_FIELD_NAME
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else:
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field_name = None
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login_url = request.build_absolute_uri(auth_url)
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response = redirect_to_login(next_url, login_url=login_url,
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redirect_field_name=field_name)
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# TODO(gabriel): Find a way to display an appropriate message to
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# the user *on* the login form...
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if request.is_ajax():
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response_401 = http.HttpResponse(status=401)
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response_401['X-Horizon-Location'] = response['location']
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return response_401
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return response
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# If an internal "NotFound" error gets this far, return a real 404.
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if isinstance(exception, exceptions.NotFound):
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raise http.Http404(exception)
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if isinstance(exception, exceptions.Http302):
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# TODO(gabriel): Find a way to display an appropriate message to
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# the user *on* the login form...
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return shortcuts.redirect(exception.location)
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def process_response(self, request, response):
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"""
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Convert HttpResponseRedirect to HttpResponse if request is via ajax
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to allow ajax request to redirect url
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"""
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if request.is_ajax():
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queued_msgs = request.horizon['async_messages']
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if type(response) == http.HttpResponseRedirect:
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# Drop our messages back into the session as per usual so they
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# don't disappear during the redirect. Not that we explicitly
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# use django's messages methods here.
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for tag, message in queued_msgs:
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getattr(django_messages, tag)(request, message)
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redirect_response = http.HttpResponse()
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redirect_response['X-Horizon-Location'] = response['location']
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return redirect_response
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if queued_msgs:
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# TODO(gabriel): When we have an async connection to the
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# client (e.g. websockets) this should be pushed to the
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# socket queue rather than being sent via a header.
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# The header method has notable drawbacks (length limits,
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# etc.) and is not meant as a long-term solution.
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response['X-Horizon-Messages'] = json.dumps(queued_msgs)
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return response
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