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# Copyright 2022 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.
import flask
from flask import make_response
import http.client
from oslo_log import log
from keystone.api._shared import authentication
from keystone.api._shared import json_home_relations
from keystone.conf import CONF
from keystone import exception
from keystone.i18n import _
from keystone.server import flask as ks_flask
LOG = log.getLogger(__name__)
_build_resource_relation = json_home_relations.os_oauth2_resource_rel_func
class AccessTokenResource(ks_flask.ResourceBase):
def _method_not_allowed(self):
"""Raise a method not allowed error."""
raise exception.OAuth2OtherError(
int(http.client.METHOD_NOT_ALLOWED),
http.client.responses[http.client.METHOD_NOT_ALLOWED],
_('The method is not allowed for the requested URL.'))
@ks_flask.unenforced_api
def get(self):
"""The method is not allowed."""
self._method_not_allowed()
@ks_flask.unenforced_api
def head(self):
"""The method is not allowed."""
self._method_not_allowed()
@ks_flask.unenforced_api
def put(self):
"""The method is not allowed."""
self._method_not_allowed()
@ks_flask.unenforced_api
def patch(self):
"""The method is not allowed."""
self._method_not_allowed()
@ks_flask.unenforced_api
def delete(self):
"""The method is not allowed."""
self._method_not_allowed()
@ks_flask.unenforced_api
def post(self):
"""Get an OAuth2.0 Access Token.
POST /v3/OS-OAUTH2/token
"""
client_auth = flask.request.authorization
if not client_auth:
error = exception.OAuth2InvalidClient(
int(http.client.UNAUTHORIZED),
http.client.responses[http.client.UNAUTHORIZED],
_('OAuth2.0 client authorization is required.'))
LOG.info('Get OAuth2.0 Access Token API: '
'field \'authorization\' is not found in HTTP Headers.')
raise error
if client_auth.type != 'basic':
error = exception.OAuth2InvalidClient(
int(http.client.UNAUTHORIZED),
http.client.responses[http.client.UNAUTHORIZED],
_('OAuth2.0 client authorization type %s is not supported.')
% client_auth.type)
LOG.info('Get OAuth2.0 Access Token API: '
f'{error.message_format}')
raise error
client_id = client_auth.username
client_secret = client_auth.password
if not client_id:
error = exception.OAuth2InvalidClient(
int(http.client.UNAUTHORIZED),
http.client.responses[http.client.UNAUTHORIZED],
_('OAuth2.0 client authorization is invalid.'))
LOG.info('Get OAuth2.0 Access Token API: '
'client_id is not found in authorization.')
raise error
if not client_secret:
error = exception.OAuth2InvalidClient(
int(http.client.UNAUTHORIZED),
http.client.responses[http.client.UNAUTHORIZED],
_('OAuth2.0 client authorization is invalid.'))
LOG.info('Get OAuth2.0 Access Token API: '
'client_secret is not found in authorization.')
raise error
grant_type = flask.request.form.get('grant_type')
if grant_type is None:
error = exception.OAuth2InvalidRequest(
int(http.client.BAD_REQUEST),
http.client.responses[http.client.BAD_REQUEST],
_('The parameter grant_type is required.'))
LOG.info('Get OAuth2.0 Access Token API: '
f'{error.message_format}')
raise error
if grant_type != 'client_credentials':
error = exception.OAuth2UnsupportedGrantType(
int(http.client.BAD_REQUEST),
http.client.responses[http.client.BAD_REQUEST],
_('The parameter grant_type %s is not supported.'
) % grant_type)
LOG.info('Get OAuth2.0 Access Token API: '
f'{error.message_format}')
raise error
auth_data = {
'identity': {
'methods': ['application_credential'],
'application_credential': {
'id': client_id,
'secret': client_secret
}
}
}
try:
token = authentication.authenticate_for_token(auth_data)
except exception.Error as error:
if error.code == 401:
error = exception.OAuth2InvalidClient(
error.code, error.title,
str(error))
elif error.code == 400:
error = exception.OAuth2InvalidRequest(
error.code, error.title,
str(error))
else:
error = exception.OAuth2OtherError(
error.code, error.title,
'An unknown error occurred and failed to get an OAuth2.0 '
'access token.')
LOG.exception(error)
raise error
except Exception as error:
error = exception.OAuth2OtherError(
int(http.client.INTERNAL_SERVER_ERROR),
http.client.responses[http.client.INTERNAL_SERVER_ERROR],
str(error))
LOG.exception(error)
raise error
resp = make_response({
'access_token': token.id,
'token_type': 'Bearer',
'expires_in': CONF.token.expiration
})
resp.status = '200 OK'
return resp
class OSAuth2API(ks_flask.APIBase):
_name = 'OS-OAUTH2'
_import_name = __name__
_api_url_prefix = '/OS-OAUTH2'
resource_mapping = [
ks_flask.construct_resource_map(
resource=AccessTokenResource,
url='/token',
rel='token',
resource_kwargs={},
resource_relation_func=_build_resource_relation
)]
APIs = (OSAuth2API,)
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