text: #
  # Copyright (c) 2014 Mirantis 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.
  
  """Policy Engine For Sahara"""
  
  import functools
  
  from oslo_config import cfg
  from oslo_policy import policy
  
  from sahara import context
  from sahara import exceptions
  
  ENFORCER = None
  
  
  def setup_policy():
      global ENFORCER
  
      ENFORCER = policy.Enforcer(cfg.CONF)
  
  
  def enforce(rule):
      def decorator(func):
          @functools.wraps(func)
          def handler(*args, **kwargs):
              ctx = context.ctx()
              ENFORCER.enforce(rule, {}, ctx.to_dict(), do_raise=True,
                               exc=exceptions.Forbidden)
  
              return func(*args, **kwargs)
          return handler
  
      return decorator
  