![eric](/assets/img/avatar_default.png)
This change will simplify horizon session management and lesson the load on session backends which currently are writing records with every page request. Pre-Requisite change: https://review.openstack.org/#/c/179800/ Change-Id: I3ff8ca6b56655c7c68743398fee903d651332867 Closes-bug: #1450914
190 lines
8.6 KiB
Python
190 lines
8.6 KiB
Python
# Copyright 2012 United States Government as represented by the
|
|
# Administrator of the National Aeronautics and Space Administration.
|
|
# All Rights Reserved.
|
|
#
|
|
# Copyright 2012 Nebula, Inc.
|
|
#
|
|
# 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 provided and used by Horizon.
|
|
"""
|
|
|
|
import json
|
|
import logging
|
|
|
|
from django.conf import settings
|
|
from django.contrib.auth import REDIRECT_FIELD_NAME # noqa
|
|
from django.contrib.auth.views import redirect_to_login # noqa
|
|
from django.contrib import messages as django_messages
|
|
from django import http
|
|
from django import shortcuts
|
|
from django.utils.encoding import iri_to_uri # noqa
|
|
from django.utils.translation import ugettext_lazy as _
|
|
|
|
from openstack_auth import views as auth_views
|
|
import six
|
|
|
|
from horizon import exceptions
|
|
from horizon.utils import functions as utils
|
|
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
class HorizonMiddleware(object):
|
|
"""The main Horizon middleware class. Required for use of Horizon."""
|
|
|
|
logout_reason = None
|
|
|
|
def _logout(self, request, login_url=None, message=None):
|
|
"""Logout a user and display a logout message."""
|
|
response = auth_views.logout(request, login_url)
|
|
if message is not None:
|
|
self.logout_reason = message
|
|
utils.add_logout_reason(request, response, message)
|
|
return response
|
|
|
|
def process_request(self, request):
|
|
"""Adds data necessary for Horizon to function to the request."""
|
|
|
|
request.horizon = {'dashboard': None,
|
|
'panel': None,
|
|
'async_messages': []}
|
|
if not hasattr(request, "user") or not request.user.is_authenticated():
|
|
# proceed no further if the current request is already known
|
|
# not to be authenticated
|
|
# it is CRITICAL to perform this check as early as possible
|
|
# to avoid creating too many sessions
|
|
return None
|
|
|
|
if request.is_ajax():
|
|
# if the request is Ajax we do not want to proceed, as clients can
|
|
# 1) create pages with constant polling, which can create race
|
|
# conditions when a page navigation occurs
|
|
# 2) might leave a user seemingly left logged in forever
|
|
# 3) thrashes db backed session engines with tons of changes
|
|
return None
|
|
# If we use cookie-based sessions, check that the cookie size does not
|
|
# reach the max size accepted by common web browsers.
|
|
if (
|
|
settings.SESSION_ENGINE ==
|
|
'django.contrib.sessions.backends.signed_cookies'
|
|
):
|
|
max_cookie_size = getattr(
|
|
settings, 'SESSION_COOKIE_MAX_SIZE', None)
|
|
session_cookie_name = getattr(
|
|
settings, 'SESSION_COOKIE_NAME', None)
|
|
session_key = request.COOKIES.get(session_cookie_name)
|
|
if max_cookie_size is not None and session_key is not None:
|
|
cookie_size = sum((
|
|
len(key) + len(value)
|
|
for key, value in six.iteritems(request.COOKIES)
|
|
))
|
|
if cookie_size >= max_cookie_size:
|
|
LOG.error(
|
|
'Total Cookie size for user_id: %(user_id)s is '
|
|
'%(cookie_size)sB >= %(max_cookie_size)sB. '
|
|
'You need to configure file-based or database-backed '
|
|
'sessions instead of cookie-based sessions: '
|
|
'http://docs.openstack.org/developer/horizon/topics/'
|
|
'deployment.html#session-storage'
|
|
% {
|
|
'user_id': request.session.get(
|
|
'user_id', 'Unknown'),
|
|
'cookie_size': cookie_size,
|
|
'max_cookie_size': max_cookie_size,
|
|
}
|
|
)
|
|
|
|
def process_exception(self, request, exception):
|
|
"""Catches internal Horizon exception classes such as NotAuthorized,
|
|
NotFound and Http302 and handles them gracefully.
|
|
"""
|
|
if isinstance(exception, (exceptions.NotAuthorized,
|
|
exceptions.NotAuthenticated)):
|
|
auth_url = settings.LOGIN_URL
|
|
next_url = iri_to_uri(request.get_full_path())
|
|
if next_url != auth_url:
|
|
field_name = REDIRECT_FIELD_NAME
|
|
else:
|
|
field_name = None
|
|
login_url = request.build_absolute_uri(auth_url)
|
|
response = redirect_to_login(next_url, login_url=login_url,
|
|
redirect_field_name=field_name)
|
|
if isinstance(exception, exceptions.NotAuthorized):
|
|
logout_reason = _("Unauthorized. Please try logging in again.")
|
|
utils.add_logout_reason(request, response, logout_reason)
|
|
# delete messages, created in get_data() method
|
|
# since we are going to redirect user to the login page
|
|
response.delete_cookie('messages')
|
|
|
|
if request.is_ajax():
|
|
response_401 = http.HttpResponse(status=401)
|
|
response_401['X-Horizon-Location'] = response['location']
|
|
return response_401
|
|
|
|
return response
|
|
|
|
# If an internal "NotFound" error gets this far, return a real 404.
|
|
if isinstance(exception, exceptions.NotFound):
|
|
raise http.Http404(exception)
|
|
|
|
if isinstance(exception, exceptions.Http302):
|
|
# TODO(gabriel): Find a way to display an appropriate message to
|
|
# the user *on* the login form...
|
|
return shortcuts.redirect(exception.location)
|
|
|
|
def process_response(self, request, response):
|
|
"""Convert HttpResponseRedirect to HttpResponse if request is via ajax
|
|
to allow ajax request to redirect url
|
|
"""
|
|
if request.is_ajax() and hasattr(request, 'horizon'):
|
|
queued_msgs = request.horizon['async_messages']
|
|
if type(response) == http.HttpResponseRedirect:
|
|
# Drop our messages back into the session as per usual so they
|
|
# don't disappear during the redirect. Not that we explicitly
|
|
# use django's messages methods here.
|
|
for tag, message, extra_tags in queued_msgs:
|
|
getattr(django_messages, tag)(request, message, extra_tags)
|
|
if response['location'].startswith(settings.LOGOUT_URL):
|
|
redirect_response = http.HttpResponse(status=401)
|
|
# This header is used for handling the logout in JS
|
|
redirect_response['logout'] = True
|
|
if self.logout_reason is not None:
|
|
utils.add_logout_reason(
|
|
request, redirect_response, self.logout_reason)
|
|
else:
|
|
redirect_response = http.HttpResponse()
|
|
# Use a set while checking if we want a cookie's attributes
|
|
# copied
|
|
cookie_keys = set(('max_age', 'expires', 'path', 'domain',
|
|
'secure', 'httponly', 'logout_reason'))
|
|
# Copy cookies from HttpResponseRedirect towards HttpResponse
|
|
for cookie_name, cookie in six.iteritems(response.cookies):
|
|
cookie_kwargs = dict((
|
|
(key, value) for key, value in six.iteritems(cookie)
|
|
if key in cookie_keys and value
|
|
))
|
|
redirect_response.set_cookie(
|
|
cookie_name, cookie.value, **cookie_kwargs)
|
|
redirect_response['X-Horizon-Location'] = response['location']
|
|
return redirect_response
|
|
if queued_msgs:
|
|
# TODO(gabriel): When we have an async connection to the
|
|
# client (e.g. websockets) this should be pushed to the
|
|
# socket queue rather than being sent via a header.
|
|
# The header method has notable drawbacks (length limits,
|
|
# etc.) and is not meant as a long-term solution.
|
|
response['X-Horizon-Messages'] = json.dumps(queued_msgs)
|
|
return response
|