# Copyright 2013 Nicira, Inc.
# 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.config import cfg
from oslo.utils import importutils

security_group_opts = [
    cfg.StrOpt('security_group_api',
               default='nova',
               help='The full class name of the security API class'),
]

CONF = cfg.CONF
CONF.register_opts(security_group_opts)

NOVA_DRIVER = ('nova.api.openstack.compute.contrib.security_groups.'
               'NativeNovaSecurityGroupAPI')
NEUTRON_DRIVER = ('nova.api.openstack.compute.contrib.security_groups.'
                  'NativeNeutronSecurityGroupAPI')


def get_openstack_security_group_driver():
    if CONF.security_group_api.lower() == 'nova':
        return importutils.import_object(NOVA_DRIVER)
    elif CONF.security_group_api.lower() in ('neutron', 'quantum'):
        return importutils.import_object(NEUTRON_DRIVER)
    else:
        return importutils.import_object(CONF.security_group_api)


def is_neutron_security_groups():
    return CONF.security_group_api.lower() in ('neutron', 'quantum')
