/usr/share/pyshared/glance/common/context.py is in python-glance 2012.1.3+stable~20120821-120fcf-0ubuntu1.5.
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# Copyright 2011 OpenStack LLC.
# All Rights Reserved.
#
# 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.
from glance.common import cfg
from glance.common import exception
from glance.common import utils
from glance.common import wsgi
class RequestContext(object):
"""
Stores information about the security context under which the user
accesses the system, as well as additional request information.
"""
def __init__(self, auth_tok=None, user=None, tenant=None, roles=None,
is_admin=False, read_only=False, show_deleted=False,
owner_is_tenant=True):
self.auth_tok = auth_tok
self.user = user
self.tenant = tenant
self.roles = roles or []
self.is_admin = is_admin
self.read_only = read_only
self._show_deleted = show_deleted
self.owner_is_tenant = owner_is_tenant
@property
def owner(self):
"""Return the owner to correlate with an image."""
return self.tenant if self.owner_is_tenant else self.user
@property
def show_deleted(self):
"""Admins can see deleted by default"""
if self._show_deleted or self.is_admin:
return True
return False
class ContextMiddleware(wsgi.Middleware):
opts = [
cfg.BoolOpt('owner_is_tenant', default=True),
cfg.StrOpt('admin_role', default='admin'),
]
def __init__(self, app, conf, **local_conf):
self.conf = conf
self.conf.register_opts(self.opts)
# Determine the context class to use
self.ctxcls = RequestContext
if 'context_class' in local_conf:
self.ctxcls = utils.import_class(local_conf['context_class'])
super(ContextMiddleware, self).__init__(app)
def make_context(self, *args, **kwargs):
"""
Create a context with the given arguments.
"""
kwargs.setdefault('owner_is_tenant', self.conf.owner_is_tenant)
return self.ctxcls(*args, **kwargs)
def process_request(self, req):
"""
Extract any authentication information in the request and
construct an appropriate context from it.
A few scenarios exist:
1. If X-Auth-Token is passed in, then consult TENANT and ROLE headers
to determine permissions.
2. An X-Auth-Token was passed in, but the Identity-Status is not
confirmed. For now, just raising a NotAuthenticated exception.
3. X-Auth-Token is omitted. If we were using Keystone, then the
tokenauth middleware would have rejected the request, so we must be
using NoAuth. In that case, assume that is_admin=True.
"""
auth_tok = req.headers.get('X-Auth-Token',
req.headers.get('X-Storage-Token'))
if auth_tok:
if req.headers.get('X-Identity-Status') == 'Confirmed':
# 1. Auth-token is passed, check other headers
user = req.headers.get('X-User-Id')
tenant = req.headers.get('X-Tenant-Id')
roles = [r.strip()
for r in req.headers.get('X-Roles', '').split(',')]
is_admin = self.conf.admin_role in roles
else:
# 2. Indentity-Status not confirmed
# FIXME(sirp): not sure what the correct behavior in this case
# is; just raising NotAuthenticated for now
raise exception.NotAuthenticated()
else:
# 3. Auth-token is ommited, assume NoAuth
user = None
tenant = None
roles = []
is_admin = True
req.context = self.make_context(
auth_tok=auth_tok, user=user, tenant=tenant, roles=roles,
is_admin=is_admin)
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