#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright (c) 2012 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.

"""Auth Components for Consoles."""

import time

from nova import manager
from nova.openstack.common import cfg
from nova.openstack.common import jsonutils
from nova.openstack.common import log as logging


LOG = logging.getLogger(__name__)

consoleauth_opts = [
    cfg.IntOpt('console_token_ttl',
               default=600,
               help='How many seconds before deleting tokens'),
    cfg.StrOpt('consoleauth_manager',
               default='nova.consoleauth.manager.ConsoleAuthManager',
               help='Manager for console auth'),
    ]

CONF = cfg.CONF
CONF.register_opts(consoleauth_opts)
CONF.import_opt('memcached_servers', 'nova.config')


class ConsoleAuthManager(manager.Manager):
    """Manages token based authentication."""

    RPC_API_VERSION = '1.0'

    def __init__(self, scheduler_driver=None, *args, **kwargs):
        super(ConsoleAuthManager, self).__init__(*args, **kwargs)

        if CONF.memcached_servers:
            import memcache
        else:
            from nova.common import memorycache as memcache
        self.mc = memcache.Client(CONF.memcached_servers,
                                  debug=0)

    def authorize_console(self, context, token, console_type, host, port,
                          internal_access_path):
        token_dict = {'token': token,
                      'console_type': console_type,
                      'host': host,
                      'port': port,
                      'internal_access_path': internal_access_path,
                      'last_activity_at': time.time()}
        data = jsonutils.dumps(token_dict)
        self.mc.set(token.encode('UTF-8'), data, CONF.console_token_ttl)
        LOG.audit(_("Received Token: %(token)s, %(token_dict)s)"), locals())

    def check_token(self, context, token):
        token_str = self.mc.get(token.encode('UTF-8'))
        token_valid = (token_str is not None)
        LOG.audit(_("Checking Token: %(token)s, %(token_valid)s)"), locals())
        if token_valid:
            return jsonutils.loads(token_str)
