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# Copyright 2013 OpenStack Foundation
#
# 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.

"""Keystone PKI Token Provider"""

import json

from keystone.common import cms
from keystone.common import environment
from keystone import config
from keystone import exception
from keystone.openstack.common import log as logging
from keystone.token.providers import uuid


CONF = config.CONF

LOG = logging.getLogger(__name__)


class Provider(uuid.Provider):
    def _get_token_id(self, token_data):
        try:
            token_id = cms.cms_sign_token(json.dumps(token_data),
                                          CONF.signing.certfile,
                                          CONF.signing.keyfile)
            return token_id
        except environment.subprocess.CalledProcessError:
            LOG.exception('Unable to sign token')
            raise exception.UnexpectedError(_(
                'Unable to sign token.'))
