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# Copyright 2012-2013 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.
#
"""Manage access to the clients, including authenticating when needed."""
import logging
import pkg_resources
import sys
import requests
from openstackclient.api import auth
from openstackclient.common import session as osc_session
from openstackclient.identity import client as identity_client
LOG = logging.getLogger(__name__)
PLUGIN_MODULES = []
class ClientCache(object):
"""Descriptor class for caching created client handles."""
def __init__(self, factory):
self.factory = factory
self._handle = None
def __get__(self, instance, owner):
# Tell the ClientManager to login to keystone
if self._handle is None:
self._handle = self.factory(instance)
return self._handle
class ClientManager(object):
"""Manages access to API clients, including authentication."""
identity = ClientCache(identity_client.make_client)
def __getattr__(self, name):
# this is for the auth-related parameters.
if name in ['_' + o.replace('-', '_')
for o in auth.OPTIONS_LIST]:
return self._auth_params[name[1:]]
raise AttributeError(name)
def __init__(
self,
cli_options=None,
api_version=None,
verify=True,
pw_func=None,
):
"""Set up a ClientManager
:param cli_options:
Options collected from the command-line, environment, or wherever
:param api_version:
Dict of API versions: key is API name, value is the version
:param verify:
TLS certificate verification; may be a boolean to enable or disable
server certificate verification, or a filename of a CA certificate
bundle to be used in verification (implies True)
:param pw_func:
Callback function for asking the user for a password. The function
takes an optional string for the prompt ('Password: ' on None) and
returns a string containing the password
"""
self._cli_options = cli_options
self._api_version = api_version
self._pw_callback = pw_func
self._url = self._cli_options.auth.get('url', None)
self._region_name = self._cli_options.region_name
self.timing = self._cli_options.timing
self._auth_ref = None
self.session = None
# verify is the Requests-compatible form
self._verify = verify
# also store in the form used by the legacy client libs
self._cacert = None
if isinstance(verify, bool):
self._insecure = not verify
else:
self._cacert = verify
self._insecure = False
# Get logging from root logger
root_logger = logging.getLogger('')
LOG.setLevel(root_logger.getEffectiveLevel())
def setup_auth(self):
"""Set up authentication
This is deferred until authentication is actually attempted because
it gets in the way of things that do not require auth.
"""
# If no auth type is named by the user, select one based on
# the supplied options
self.auth_plugin_name = auth.select_auth_plugin(self._cli_options)
# Basic option checking to avoid unhelpful error messages
auth.check_valid_auth_options(self._cli_options, self.auth_plugin_name)
# Horrible hack alert...must handle prompt for null password if
# password auth is requested.
if (self.auth_plugin_name.endswith('password') and
not self._cli_options.auth.get('password', None)):
self._cli_options.os_password = self._pw_callback()
(auth_plugin, self._auth_params) = auth.build_auth_params(
self.auth_plugin_name,
self._cli_options,
)
# TODO(mordred): This is a usability improvement that's broadly useful
# We should port it back up into os-client-config.
default_domain = self._cli_options.default_domain
# NOTE(stevemar): If PROJECT_DOMAIN_ID or PROJECT_DOMAIN_NAME is
# present, then do not change the behaviour. Otherwise, set the
# PROJECT_DOMAIN_ID to 'OS_DEFAULT_DOMAIN' for better usability.
if (self._api_version.get('identity') == '3' and
not self._auth_params.get('project_domain_id', None) and
not self._auth_params.get('project_domain_name', None)):
self._auth_params['project_domain_id'] = default_domain
# NOTE(stevemar): If USER_DOMAIN_ID or USER_DOMAIN_NAME is present,
# then do not change the behaviour. Otherwise, set the USER_DOMAIN_ID
# to 'OS_DEFAULT_DOMAIN' for better usability.
if (self._api_version.get('identity') == '3' and
self.auth_plugin_name.endswith('password') and
not self._auth_params.get('user_domain_id', None) and
not self._auth_params.get('user_domain_name', None)):
self._auth_params['user_domain_id'] = default_domain
# For compatibility until all clients can be updated
if 'project_name' in self._auth_params:
self._project_name = self._auth_params['project_name']
elif 'tenant_name' in self._auth_params:
self._project_name = self._auth_params['tenant_name']
LOG.info('Using auth plugin: %s' % self.auth_plugin_name)
self.auth = auth_plugin.load_from_options(**self._auth_params)
# needed by SAML authentication
request_session = requests.session()
self.session = osc_session.TimingSession(
auth=self.auth,
session=request_session,
verify=self._verify,
)
return
@property
def auth_ref(self):
"""Dereference will trigger an auth if it hasn't already"""
if not self._auth_ref:
self.setup_auth()
LOG.debug("Get auth_ref")
self._auth_ref = self.auth.get_auth_ref(self.session)
return self._auth_ref
def get_endpoint_for_service_type(self, service_type, region_name=None):
"""Return the endpoint URL for the service type."""
# See if we are using password flow auth, i.e. we have a
# service catalog to select endpoints from
if self.auth_ref:
endpoint = self.auth_ref.service_catalog.url_for(
service_type=service_type,
region_name=region_name,
)
else:
# Get the passed endpoint directly from the auth plugin
endpoint = self.auth.get_endpoint(self.session)
return endpoint
# Plugin Support
def get_plugin_modules(group):
"""Find plugin entry points"""
mod_list = []
for ep in pkg_resources.iter_entry_points(group):
LOG.debug('Found plugin %r', ep.name)
__import__(ep.module_name)
module = sys.modules[ep.module_name]
mod_list.append(module)
init_func = getattr(module, 'Initialize', None)
if init_func:
init_func('x')
# Add the plugin to the ClientManager
setattr(
ClientManager,
module.API_NAME,
ClientCache(
getattr(sys.modules[ep.module_name], 'make_client', None)
),
)
return mod_list
def build_plugin_option_parser(parser):
"""Add plugin options to the parser"""
# Loop through extensions to get parser additions
for mod in PLUGIN_MODULES:
parser = mod.build_option_parser(parser)
return parser
# Get list of base plugin modules
PLUGIN_MODULES = get_plugin_modules(
'openstack.cli.base',
)
# Append list of external plugin modules
PLUGIN_MODULES.extend(get_plugin_modules(
'openstack.cli.extension',
))
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