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diff --git a/keystone-moon/keystone/common/authorization.py b/keystone-moon/keystone/common/authorization.py
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+++ b/keystone-moon/keystone/common/authorization.py
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+# Copyright 2012 OpenStack Foundation
+# Copyright 2010 United States Government as represented by the
+# Administrator of the National Aeronautics and Space Administration.
+# Copyright 2011 - 2012 Justin Santa Barbara
+# 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 oslo_log import log
+
+from keystone import exception
+from keystone.i18n import _, _LW
+from keystone.models import token_model
+
+
+AUTH_CONTEXT_ENV = 'KEYSTONE_AUTH_CONTEXT'
+"""Environment variable used to convey the Keystone auth context.
+
+Auth context is essentially the user credential used for policy enforcement.
+It is a dictionary with the following attributes:
+
+* ``user_id``: user ID of the principal
+* ``project_id`` (optional): project ID of the scoped project if auth is
+                             project-scoped
+* ``domain_id`` (optional): domain ID of the scoped domain if auth is
+                            domain-scoped
+* ``roles`` (optional): list of role names for the given scope
+* ``group_ids``: list of group IDs for which the API user has membership
+
+"""
+
+LOG = log.getLogger(__name__)
+
+
+def token_to_auth_context(token):
+    if not isinstance(token, token_model.KeystoneToken):
+        raise exception.UnexpectedError(_('token reference must be a '
+                                          'KeystoneToken type, got: %s') %
+                                        type(token))
+    auth_context = {'token': token,
+                    'is_delegated_auth': False}
+    try:
+        auth_context['user_id'] = token.user_id
+    except KeyError:
+        LOG.warning(_LW('RBAC: Invalid user data in token'))
+        raise exception.Unauthorized()
+
+    if token.project_scoped:
+        auth_context['project_id'] = token.project_id
+    elif token.domain_scoped:
+        auth_context['domain_id'] = token.domain_id
+    else:
+        LOG.debug('RBAC: Proceeding without project or domain scope')
+
+    if token.trust_scoped:
+        auth_context['is_delegated_auth'] = True
+        auth_context['trust_id'] = token.trust_id
+        auth_context['trustor_id'] = token.trustor_user_id
+        auth_context['trustee_id'] = token.trustee_user_id
+    else:
+        auth_context['trust_id'] = None
+        auth_context['trustor_id'] = None
+        auth_context['trustee_id'] = None
+
+    roles = token.role_names
+    if roles:
+        auth_context['roles'] = roles
+
+    if token.oauth_scoped:
+        auth_context['is_delegated_auth'] = True
+    auth_context['consumer_id'] = token.oauth_consumer_id
+    auth_context['access_token_id'] = token.oauth_access_token_id
+
+    if token.is_federated_user:
+        auth_context['group_ids'] = token.federation_group_ids
+
+    return auth_context