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# Copyright 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.
#
# vim: tabstop=4 shiftwidth=4 softtabstop=4
try:
import json
except ImportError:
import simplejson as json
import logging
import os
import urlparse
# Python 2.5 compat fix
if not hasattr(urlparse, 'parse_qsl'):
import cgi
urlparse.parse_qsl = cgi.parse_qsl
import httplib2
from quantumclient.common import exceptions
from quantumclient.common import utils
_logger = logging.getLogger(__name__)
if 'QUANTUMCLIENT_DEBUG' in os.environ and os.environ['QUANTUMCLIENT_DEBUG']:
ch = logging.StreamHandler()
_logger.setLevel(logging.DEBUG)
_logger.addHandler(ch)
class ServiceCatalog(object):
"""Helper methods for dealing with a Keystone Service Catalog."""
def __init__(self, resource_dict):
self.catalog = resource_dict
def get_token(self):
"""Fetch token details fron service catalog"""
token = {'id': self.catalog['access']['token']['id'],
'expires': self.catalog['access']['token']['expires'], }
try:
token['user_id'] = self.catalog['access']['user']['id']
token['tenant_id'] = (
self.catalog['access']['token']['tenant']['id'])
except:
# just leave the tenant and user out if it doesn't exist
pass
return token
def url_for(self, attr=None, filter_value=None,
service_type='network', endpoint_type='adminURL'):
"""Fetch the admin URL from the Quantum service for
a particular endpoint attribute. If none given, return
the first. See tests for sample service catalog."""
catalog = self.catalog['access'].get('serviceCatalog', [])
matching_endpoints = []
for service in catalog:
if service['type'] != service_type:
continue
endpoints = service['endpoints']
for endpoint in endpoints:
if not filter_value or endpoint.get(attr) == filter_value:
matching_endpoints.append(endpoint)
if not matching_endpoints:
raise exceptions.EndpointNotFound()
elif len(matching_endpoints) > 1:
raise exceptions.AmbiguousEndpoints(message=matching_endpoints)
else:
return matching_endpoints[0][endpoint_type]
class HTTPClient(httplib2.Http):
"""Handles the REST calls and responses, include authn"""
USER_AGENT = 'python-quantumclient'
def __init__(self, username=None, tenant_name=None,
password=None, auth_url=None,
token=None, region_name=None, timeout=None,
endpoint_url=None, insecure=False,
auth_strategy='keystone', **kwargs):
super(HTTPClient, self).__init__(timeout=timeout)
self.username = username
self.tenant_name = tenant_name
self.password = password
self.auth_url = auth_url.rstrip('/') if auth_url else None
self.region_name = region_name
self.auth_token = token
self.token_retrieved = False
self.content_type = 'application/json'
self.endpoint_url = endpoint_url
self.auth_strategy = auth_strategy
# httplib2 overrides
self.force_exception_to_status_code = True
self.disable_ssl_certificate_validation = insecure
def _cs_request(self, *args, **kwargs):
kargs = {}
kargs.setdefault('headers', kwargs.get('headers', {}))
kargs['headers']['User-Agent'] = self.USER_AGENT
if 'content_type' in kwargs:
kargs['headers']['Content-Type'] = kwargs['content_type']
kargs['headers']['Accept'] = kwargs['content_type']
else:
kargs['headers']['Content-Type'] = self.content_type
kargs['headers']['Accept'] = self.content_type
if 'body' in kwargs:
kargs['body'] = kwargs['body']
utils.http_log_req(_logger, args, kargs)
resp, body = self.request(*args, **kargs)
utils.http_log_resp(_logger, resp, body)
status_code = self.get_status_code(resp)
if status_code == 401:
raise exceptions.Unauthorized(message=body)
elif status_code == 403:
raise exceptions.Forbidden(message=body)
return resp, body
def do_request(self, url, method, **kwargs):
if not self.endpoint_url:
self.authenticate()
# Perform the request once. If we get a 401 back then it
# might be because the auth token expired, so try to
# re-authenticate and try again. If it still fails, bail.
try:
if self.auth_token:
kwargs.setdefault('headers', {})
kwargs['headers']['X-Auth-Token'] = self.auth_token
resp, body = self._cs_request(self.endpoint_url + url, method,
**kwargs)
return resp, body
except exceptions.Unauthorized as ex:
if not self.endpoint_url or self.token_retrieved:
self.authenticate()
if self.auth_token:
kwargs.setdefault('headers', {})
kwargs['headers']['X-Auth-Token'] = self.auth_token
resp, body = self._cs_request(
self.endpoint_url + url, method, **kwargs)
return resp, body
else:
raise ex
def _extract_service_catalog(self, body):
""" Set the client's service catalog from the response data. """
self.service_catalog = ServiceCatalog(body)
try:
sc = self.service_catalog.get_token()
self.auth_token = sc['id']
self.auth_tenant_id = sc.get('tenant_id')
self.auth_user_id = sc.get('user_id')
self.token_retrieved = True
except KeyError:
raise exceptions.Unauthorized()
self.endpoint_url = self.service_catalog.url_for(
attr='region', filter_value=self.region_name,
endpoint_type='adminURL')
def authenticate(self):
if self.auth_strategy != 'keystone':
raise exceptions.Unauthorized(message='unknown auth strategy')
body = {'auth': {'passwordCredentials':
{'username': self.username,
'password': self.password, },
'tenantName': self.tenant_name, }, }
token_url = self.auth_url + "/tokens"
# Make sure we follow redirects when trying to reach Keystone
tmp_follow_all_redirects = self.follow_all_redirects
self.follow_all_redirects = True
try:
resp, body = self._cs_request(token_url, "POST",
body=json.dumps(body),
content_type="application/json")
finally:
self.follow_all_redirects = tmp_follow_all_redirects
status_code = self.get_status_code(resp)
if status_code != 200:
raise exceptions.Unauthorized(message=body)
if body:
try:
body = json.loads(body)
except ValueError:
pass
else:
body = None
self._extract_service_catalog(body)
def get_status_code(self, response):
"""
Returns the integer status code from the response, which
can be either a Webob.Response (used in testing) or httplib.Response
"""
if hasattr(response, 'status_int'):
return response.status_int
else:
return response.status
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