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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 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.
import logging
import urlparse
from keystoneclient import client
from keystoneclient import exceptions
_logger = logging.getLogger(__name__)
class Client(client.HTTPClient):
"""Client for the OpenStack Keystone pre-version calls API.
:param string endpoint: A user-supplied endpoint URL for the keystone
service.
:param integer timeout: Allows customization of the timeout for client
http requests. (optional)
Example::
>>> from keystoneclient.generic import client
>>> root = client.Client(auth_url=KEYSTONE_URL)
>>> versions = root.discover()
...
>>> from keystoneclient.v2_0 import client as v2client
>>> keystone = v2client.Client(auth_url=versions['v2.0']['url'])
...
>>> user = keystone.users.get(USER_ID)
>>> user.delete()
"""
def __init__(self, endpoint=None, **kwargs):
""" Initialize a new client for the Keystone v2.0 API. """
super(Client, self).__init__(endpoint=endpoint, **kwargs)
self.endpoint = endpoint
def discover(self, url=None):
""" Discover Keystone servers and return API versions supported.
:param url: optional url to test (without version)
Returns::
{
'message': 'Keystone found at http://127.0.0.1:5000/',
'v2.0': {
'status': 'beta',
'url': 'http://127.0.0.1:5000/v2.0/',
'id': 'v2.0'
},
}
"""
if url:
return self._check_keystone_versions(url)
else:
return self._local_keystone_exists()
def _local_keystone_exists(self):
""" Checks if Keystone is available on default local port 35357 """
return self._check_keystone_versions("http://localhost:35357")
def _check_keystone_versions(self, url):
""" Calls Keystone URL and detects the available API versions """
try:
httpclient = client.HTTPClient()
resp, body = httpclient.request(url, "GET",
headers={'Accept': 'application/json'})
if resp.status in (200, 204): # in some cases we get No Content
try:
results = {}
if 'version' in body:
results['message'] = "Keystone found at %s" % url
version = body['version']
# Stable/diablo incorrect format
id, status, version_url = self._get_version_info(
version, url)
results[str(id)] = {"id": id,
"status": status,
"url": version_url}
return results
elif 'versions' in body:
# Correct format
results['message'] = "Keystone found at %s" % url
for version in body['versions']['values']:
id, status, version_url = self._get_version_info(
version, url)
results[str(id)] = {"id": id,
"status": status,
"url": version_url}
return results
else:
results['message'] = "Unrecognized response from %s" \
% url
return results
except KeyError:
raise exceptions.AuthorizationFailure()
elif resp.status == 305:
return self._check_keystone_versions(resp['location'])
else:
raise exceptions.from_response(resp, body)
except Exception as e:
_logger.exception(e)
def discover_extensions(self, url=None):
""" Discover Keystone extensions supported.
:param url: optional url to test (should have a version in it)
Returns::
{
'message': 'Keystone extensions at http://127.0.0.1:35357/v2',
'OS-KSEC2': 'OpenStack EC2 Credentials Extension',
}
"""
if url:
return self._check_keystone_extensions(url)
def _check_keystone_extensions(self, url):
""" Calls Keystone URL and detects the available extensions """
try:
httpclient = client.HTTPClient()
if not url.endswith("/"):
url += '/'
resp, body = httpclient.request("%sextensions" % url, "GET",
headers={'Accept': 'application/json'})
if resp.status in (200, 204): # in some cases we get No Content
try:
results = {}
if 'extensions' in body:
if 'values' in body['extensions']:
# Parse correct format (per contract)
for extension in body['extensions']['values']:
alias, name = self._get_extension_info(
extension['extension'])
results[alias] = name
return results
else:
# Support incorrect, but prevalent format
for extension in body['extensions']:
alias, name = self._get_extension_info(
extension)
results[alias] = name
return results
else:
results['message'] = "Unrecognized extensions" \
" response from %s" % url
return results
except KeyError:
raise exceptions.AuthorizationFailure()
elif resp.status == 305:
return self._check_keystone_extensions(resp['location'])
else:
raise exceptions.from_response(resp, body)
except Exception as e:
_logger.exception(e)
@staticmethod
def _get_version_info(version, root_url):
""" Parses version information
:param version: a dict of a Keystone version response
:param root_url: string url used to construct
the version if no URL is provided.
:returns: tuple - (verionId, versionStatus, versionUrl)
"""
id = version['id']
status = version['status']
ref = urlparse.urljoin(root_url, id)
if 'links' in version:
for link in version['links']:
if link['rel'] == 'self':
ref = link['href']
break
return (id, status, ref)
@staticmethod
def _get_extension_info(extension):
""" Parses extension information
:param extension: a dict of a Keystone extension response
:returns: tuple - (alias, name)
"""
alias = extension['alias']
name = extension['name']
return (alias, name)
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