text: #!/usr/bin/env python
  # Copyright (c) 2012 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.
  
  """Auth Components for Consoles."""
  
  import time
  
  from oslo_log import log as logging
  import oslo_messaging as messaging
  from oslo_serialization import jsonutils
  
  from nova import cache_utils
  from nova.cells import rpcapi as cells_rpcapi
  from nova.compute import rpcapi as compute_rpcapi
  import nova.conf
  from nova import context as nova_context
  from nova.i18n import _LI
  from nova import manager
  from nova import objects
  
  
  LOG = logging.getLogger(__name__)
  
  CONF = nova.conf.CONF
  
  
  class ConsoleAuthManager(manager.Manager):
      """Manages token based authentication."""
  
      target = messaging.Target(version='2.1')
  
      def __init__(self, scheduler_driver=None, *args, **kwargs):
          super(ConsoleAuthManager, self).__init__(service_name='consoleauth',
                                                   *args, **kwargs)
          self._mc = None
          self._mc_instance = None
          self.compute_rpcapi = compute_rpcapi.ComputeAPI()
          self.cells_rpcapi = cells_rpcapi.CellsAPI()
  
      @property
      def mc(self):
          if self._mc is None:
              self._mc = cache_utils.get_client(CONF.consoleauth.token_ttl)
          return self._mc
  
      @property
      def mc_instance(self):
          if self._mc_instance is None:
              self._mc_instance = cache_utils.get_client()
          return self._mc_instance
  
      def reset(self):
          LOG.info(_LI('Reloading compute RPC API'))
          compute_rpcapi.LAST_VERSION = None
          self.compute_rpcapi = compute_rpcapi.ComputeAPI()
  
      def _get_tokens_for_instance(self, instance_uuid):
          tokens_str = self.mc_instance.get(instance_uuid.encode('UTF-8'))
          if not tokens_str:
              tokens = []
          else:
              tokens = jsonutils.loads(tokens_str)
          return tokens
  
      def authorize_console(self, context, token, console_type, host, port,
                            internal_access_path, instance_uuid,
                            access_url=None):
  
          token_dict = {'token': token,
                        'instance_uuid': instance_uuid,
                        'console_type': console_type,
                        'host': host,
                        'port': port,
                        'internal_access_path': internal_access_path,
                        'access_url': access_url,
                        'last_activity_at': time.time()}
          data = jsonutils.dumps(token_dict)
  
          self.mc.set(token.encode('UTF-8'), data)
          tokens = self._get_tokens_for_instance(instance_uuid)
  
          # Remove the expired tokens from cache.
          token_values = self.mc.get_multi(
              [tok.encode('UTF-8') for tok in tokens])
          tokens = [name for name, value in zip(tokens, token_values)
                    if value is not None]
          tokens.append(token)
  
          self.mc_instance.set(instance_uuid.encode('UTF-8'),
                               jsonutils.dumps(tokens))
  
          LOG.info(_LI("Received Token: %(token)s, %(token_dict)s"),
                    {'token': token, 'token_dict': token_dict})
  
      def _validate_token(self, context, token):
          instance_uuid = token['instance_uuid']
          if instance_uuid is None:
              return False
  
          # NOTE(comstud): consoleauth was meant to run in API cells.  So,
          # if cells is enabled, we must call down to the child cell for
          # the instance.
          if CONF.cells.enable:
              return self.cells_rpcapi.validate_console_port(context,
                      instance_uuid, token['port'], token['console_type'])
  
          mapping = objects.InstanceMapping.get_by_instance_uuid(context,
                                                                 instance_uuid)
          with nova_context.target_cell(context, mapping.cell_mapping) as cctxt:
              instance = objects.Instance.get_by_uuid(cctxt, instance_uuid)
  
              return self.compute_rpcapi.validate_console_port(
                  cctxt,
                  instance,
                  token['port'],
                  token['console_type'])
  
      def check_token(self, context, token):
          token_str = self.mc.get(token.encode('UTF-8'))
          token_valid = (token_str is not None)
          LOG.info(_LI("Checking Token: %(token)s, %(token_valid)s"),
                    {'token': token, 'token_valid': token_valid})
          if token_valid:
              token = jsonutils.loads(token_str)
              if self._validate_token(context, token):
                  return token
  
      def delete_tokens_for_instance(self, context, instance_uuid):
          tokens = self._get_tokens_for_instance(instance_uuid)
          self.mc.delete_multi(
                  [tok.encode('UTF-8') for tok in tokens])
          self.mc_instance.delete(instance_uuid.encode('UTF-8'))
  