195 lines
8.8 KiB
Python
195 lines
8.8 KiB
Python
# 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.conf import settings
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from django.contrib.auth import REDIRECT_FIELD_NAME # noqa
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from django.contrib.auth.views import redirect_to_login # noqa
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from django.contrib import messages as django_messages
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from django import http
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from django import shortcuts
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from django.utils.encoding import iri_to_uri # noqa
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from django.utils import timezone
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from django.utils.translation import ugettext_lazy as _
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from openstack_auth import views as auth_views
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import six
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from horizon import exceptions
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from horizon.utils import functions as utils
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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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logout_reason = None
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def _logout(self, request, login_url=None, message=None):
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"""Logout a user and display a logout message."""
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response = auth_views.logout(request, login_url)
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if message is not None:
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self.logout_reason = message
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utils.add_logout_reason(request, response, message)
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return response
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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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request.horizon = {'dashboard': None,
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'panel': None,
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'async_messages': []}
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if not hasattr(request, "user") or not request.user.is_authenticated():
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# proceed no further if the current request is already known
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# not to be authenticated
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# it is CRITICAL to perform this check as early as possible
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# to avoid creating too many sessions
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return None
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if request.is_ajax():
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# if the request is Ajax we do not want to proceed, as clients can
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# 1) create pages with constant polling, which can create race
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# conditions when a page navigation occurs
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# 2) might leave a user seemingly left logged in forever
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# 3) thrashes db backed session engines with tons of changes
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return None
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# If we use cookie-based sessions, check that the cookie size does not
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# reach the max size accepted by common web browsers.
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if (
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settings.SESSION_ENGINE ==
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'django.contrib.sessions.backends.signed_cookies'
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):
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max_cookie_size = getattr(
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settings, 'SESSION_COOKIE_MAX_SIZE', None)
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session_cookie_name = getattr(
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settings, 'SESSION_COOKIE_NAME', None)
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session_key = request.COOKIES.get(session_cookie_name)
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if max_cookie_size is not None and session_key is not None:
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cookie_size = sum((
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len(key) + len(value)
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for key, value in six.iteritems(request.COOKIES)
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))
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if cookie_size >= max_cookie_size:
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LOG.error(
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'Total Cookie size for user_id: %(user_id)s is '
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'%(cookie_size)sB >= %(max_cookie_size)sB. '
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'You need to configure file-based or database-backed '
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'sessions instead of cookie-based sessions: '
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'http://docs.openstack.org/developer/horizon/topics/'
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'deployment.html#session-storage'
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% {
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'user_id': request.session.get(
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'user_id', 'Unknown'),
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'cookie_size': cookie_size,
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'max_cookie_size': max_cookie_size,
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}
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)
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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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def process_exception(self, request, exception):
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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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if isinstance(exception, exceptions.NotAuthorized):
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logout_reason = _("Unauthorized. Please try logging in again.")
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utils.add_logout_reason(request, response, logout_reason)
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# delete messages, created in get_data() method
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# since we are going to redirect user to the login page
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response.delete_cookie('messages')
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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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"""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() and hasattr(request, 'horizon'):
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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, extra_tags in queued_msgs:
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getattr(django_messages, tag)(request, message, extra_tags)
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if response['location'].startswith(settings.LOGOUT_URL):
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redirect_response = http.HttpResponse(status=401)
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# This header is used for handling the logout in JS
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redirect_response['logout'] = True
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if self.logout_reason is not None:
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utils.add_logout_reason(
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request, redirect_response, self.logout_reason)
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else:
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redirect_response = http.HttpResponse()
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# Use a set while checking if we want a cookie's attributes
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# copied
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cookie_keys = set(('max_age', 'expires', 'path', 'domain',
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'secure', 'httponly', 'logout_reason'))
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# Copy cookies from HttpResponseRedirect towards HttpResponse
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for cookie_name, cookie in six.iteritems(response.cookies):
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cookie_kwargs = dict((
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(key, value) for key, value in six.iteritems(cookie)
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if key in cookie_keys and value
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))
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redirect_response.set_cookie(
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cookie_name, cookie.value, **cookie_kwargs)
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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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