text: # Copyright (c) 2011 OpenStack Foundation
  # 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.
  
  """Policy engine for keystone."""
  
  from oslo_log import log
  
  from keystone.common import policy
  from keystone import exception
  from keystone.policy.backends import base
  
  
  LOG = log.getLogger(__name__)
  
  
  class Policy(base.PolicyDriverBase):
      def enforce(self, credentials, action, target):
          msg = 'enforce %(action)s: %(credentials)s'
          LOG.debug(msg, {
              'action': action,
              'credentials': credentials})
          policy.enforce(credentials, action, target)
  
      def create_policy(self, policy_id, policy):
          raise exception.NotImplemented()
  
      def list_policies(self):
          raise exception.NotImplemented()
  
      def get_policy(self, policy_id):
          raise exception.NotImplemented()
  
      def update_policy(self, policy_id, policy):
          raise exception.NotImplemented()
  
      def delete_policy(self, policy_id):
          raise exception.NotImplemented()
  