675 lines
27 KiB
Python
675 lines
27 KiB
Python
# Copyright 2012-2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from __future__ import absolute_import
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import uuid
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import ldap as ldap
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import ldap.filter
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from keystone import assignment
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from keystone.assignment.role_backends import ldap as ldap_role
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from keystone import clean
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from keystone.common import driver_hints
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from keystone.common import ldap as common_ldap
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from keystone.common import models
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from keystone import config
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from keystone import exception
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from keystone.i18n import _
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from keystone.identity.backends import ldap as ldap_identity
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from keystone.openstack.common import log
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CONF = config.CONF
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LOG = log.getLogger(__name__)
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class Assignment(assignment.Driver):
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def __init__(self):
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super(Assignment, self).__init__()
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self.LDAP_URL = CONF.ldap.url
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self.LDAP_USER = CONF.ldap.user
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self.LDAP_PASSWORD = CONF.ldap.password
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self.suffix = CONF.ldap.suffix
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# These are the only deep dependency from assignment back
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# to identity. The assumption is that if you are using
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# LDAP for assignments, you are using it for Id as well.
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self.user = ldap_identity.UserApi(CONF)
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self.group = ldap_identity.GroupApi(CONF)
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self.project = ProjectApi(CONF)
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self.role = RoleApi(CONF, self.user)
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def default_role_driver(self):
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return 'keystone.assignment.role_backends.ldap.Role'
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def _set_default_parent_project(self, ref):
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"""If the parent project ID has not been set, set it to None."""
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if isinstance(ref, dict):
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if 'parent_id' not in ref:
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ref = dict(ref, parent_id=None)
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return ref
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elif isinstance(ref, list):
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return [self._set_default_parent_project(x) for x in ref]
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else:
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raise ValueError(_('Expected dict or list: %s') % type(ref))
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def _validate_parent_project_is_none(self, ref):
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"""If a parent_id different from None was given,
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raises InvalidProjectException.
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"""
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parent_id = ref.get('parent_id')
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if parent_id is not None:
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raise exception.InvalidParentProject(parent_id)
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def _set_default_attributes(self, project_ref):
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project_ref = self._set_default_domain(project_ref)
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return self._set_default_parent_project(project_ref)
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def get_project(self, tenant_id):
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return self._set_default_attributes(
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self.project.get(tenant_id))
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def list_projects(self, hints):
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return self._set_default_attributes(
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self.project.get_all())
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def list_projects_in_domain(self, domain_id):
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# We don't support multiple domains within this driver, so ignore
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# any domain specified
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return self.list_projects(driver_hints.Hints())
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def list_projects_in_subtree(self, project_id):
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# We don't support projects hierarchy within this driver, so a
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# project will never have children
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return []
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def list_project_parents(self, project_id):
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# We don't support projects hierarchy within this driver, so a
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# project will never have parents
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return []
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def is_leaf_project(self, project_id):
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# We don't support projects hierarchy within this driver, so a
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# project will always be a root and a leaf at the same time
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return True
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def get_project_by_name(self, tenant_name, domain_id):
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self._validate_default_domain_id(domain_id)
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return self._set_default_attributes(
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self.project.get_by_name(tenant_name))
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def create_project(self, tenant_id, tenant):
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self.project.check_allow_create()
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tenant = self._validate_default_domain(tenant)
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self._validate_parent_project_is_none(tenant)
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tenant['name'] = clean.project_name(tenant['name'])
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data = tenant.copy()
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if 'id' not in data or data['id'] is None:
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data['id'] = str(uuid.uuid4().hex)
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if 'description' in data and data['description'] in ['', None]:
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data.pop('description')
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return self._set_default_attributes(
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self.project.create(data))
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def update_project(self, tenant_id, tenant):
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self.project.check_allow_update()
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tenant = self._validate_default_domain(tenant)
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if 'name' in tenant:
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tenant['name'] = clean.project_name(tenant['name'])
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return self._set_default_attributes(
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self.project.update(tenant_id, tenant))
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def list_role_ids_for_groups_on_project(
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self, groups, project_id, project_domain_id):
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self.get_project(project_id)
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group_dns = [self.group._id_to_dn(group_id) for group_id in groups]
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role_list = [self.role._dn_to_id(role_assignment.role_dn)
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for role_assignment in self.role.get_role_assignments
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(self.project._id_to_dn(project_id))
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if role_assignment.user_dn.upper() in group_dns]
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# NOTE(morganfainberg): Does not support OS-INHERIT as domain
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# metadata/roles are not supported by LDAP backend. Skip OS-INHERIT
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# logic.
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return role_list
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def _get_metadata(self, user_id=None, tenant_id=None,
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domain_id=None, group_id=None):
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def _get_roles_for_just_user_and_project(user_id, tenant_id):
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self.get_project(tenant_id)
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user_dn = self.user._id_to_dn(user_id)
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return [self.role._dn_to_id(a.role_dn)
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for a in self.role.get_role_assignments
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(self.project._id_to_dn(tenant_id))
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if common_ldap.is_dn_equal(a.user_dn, user_dn)]
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def _get_roles_for_group_and_project(group_id, project_id):
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self.get_project(project_id)
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group_dn = self.group._id_to_dn(group_id)
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return [self.role._dn_to_id(a.role_dn)
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for a in self.role.get_role_assignments
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(self.project._id_to_dn(project_id))
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if common_ldap.is_dn_equal(a.user_dn, group_dn)]
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if domain_id is not None:
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msg = _('Domain metadata not supported by LDAP')
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raise exception.NotImplemented(message=msg)
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if group_id is None and user_id is None:
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return {}
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if tenant_id is None:
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return {}
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if user_id is None:
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metadata_ref = _get_roles_for_group_and_project(group_id,
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tenant_id)
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else:
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metadata_ref = _get_roles_for_just_user_and_project(user_id,
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tenant_id)
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if not metadata_ref:
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return {}
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return {'roles': [self._role_to_dict(r, False) for r in metadata_ref]}
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def list_projects_for_user(self, user_id, group_ids, hints):
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user_dn = self.user._id_to_dn(user_id)
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associations = (self.role.list_project_roles_for_user
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(user_dn, self.project.tree_dn))
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for group_id in group_ids:
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group_dn = self.group._id_to_dn(group_id)
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for group_role in self.role.list_project_roles_for_group(
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group_dn, self.project.tree_dn):
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associations.append(group_role)
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# Since the LDAP backend doesn't store the domain_id in the LDAP
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# records (and only supports the default domain), we fill in the
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# domain_id before we return the list.
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return [self._set_default_attributes(x) for x in
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self.project.get_user_projects(user_dn, associations)]
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def list_role_ids_for_groups(
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self, group_ids, project_id=None, domain_id=None):
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raise exception.NotImplemented()
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def list_projects_for_groups(self, group_ids):
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raise exception.NotImplemented()
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def list_domains_for_user(self, user_id, group_ids, hints):
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raise exception.NotImplemented()
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def list_domains_for_groups(self, group_ids):
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raise exception.NotImplemented()
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def list_user_ids_for_project(self, tenant_id):
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self.get_project(tenant_id)
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tenant_dn = self.project._id_to_dn(tenant_id)
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rolegrants = self.role.get_role_assignments(tenant_dn)
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return [self.user._dn_to_id(user_dn) for user_dn in
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self.project.get_user_dns(tenant_id, rolegrants)]
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def _subrole_id_to_dn(self, role_id, tenant_id):
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if tenant_id is None:
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return self.role._id_to_dn(role_id)
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else:
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return '%s=%s,%s' % (self.role.id_attr,
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ldap.dn.escape_dn_chars(role_id),
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self.project._id_to_dn(tenant_id))
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def add_role_to_user_and_project(self, user_id, tenant_id, role_id):
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self.get_project(tenant_id)
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user_dn = self.user._id_to_dn(user_id)
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role_dn = self._subrole_id_to_dn(role_id, tenant_id)
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self.role.add_user(role_id, role_dn, user_dn, user_id, tenant_id)
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tenant_dn = self.project._id_to_dn(tenant_id)
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return UserRoleAssociation(role_dn=role_dn,
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user_dn=user_dn,
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tenant_dn=tenant_dn)
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def _add_role_to_group_and_project(self, group_id, tenant_id, role_id):
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self.get_project(tenant_id)
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group_dn = self.group._id_to_dn(group_id)
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role_dn = self._subrole_id_to_dn(role_id, tenant_id)
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self.role.add_user(role_id, role_dn, group_dn, group_id, tenant_id)
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tenant_dn = self.project._id_to_dn(tenant_id)
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return GroupRoleAssociation(group_dn=group_dn,
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role_dn=role_dn,
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tenant_dn=tenant_dn)
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def delete_project(self, tenant_id):
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self.project.check_allow_delete()
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if self.project.subtree_delete_enabled:
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self.project.deleteTree(tenant_id)
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else:
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tenant_dn = self.project._id_to_dn(tenant_id)
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self.role.roles_delete_subtree_by_project(tenant_dn)
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self.project.delete(tenant_id)
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def remove_role_from_user_and_project(self, user_id, tenant_id, role_id):
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role_dn = self._subrole_id_to_dn(role_id, tenant_id)
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return self.role.delete_user(role_dn,
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self.user._id_to_dn(user_id), role_id)
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def _remove_role_from_group_and_project(self, group_id, tenant_id,
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role_id):
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role_dn = self._subrole_id_to_dn(role_id, tenant_id)
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return self.role.delete_user(role_dn,
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self.group._id_to_dn(group_id), role_id)
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def create_domain(self, domain_id, domain):
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if domain_id == CONF.identity.default_domain_id:
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msg = _('Duplicate ID, %s.') % domain_id
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raise exception.Conflict(type='domain', details=msg)
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raise exception.Forbidden(_('Domains are read-only against LDAP'))
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def get_domain(self, domain_id):
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self._validate_default_domain_id(domain_id)
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return assignment.calc_default_domain()
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def update_domain(self, domain_id, domain):
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self._validate_default_domain_id(domain_id)
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raise exception.Forbidden(_('Domains are read-only against LDAP'))
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def delete_domain(self, domain_id):
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self._validate_default_domain_id(domain_id)
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raise exception.Forbidden(_('Domains are read-only against LDAP'))
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def list_domains(self, hints):
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return [assignment.calc_default_domain()]
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# Bulk actions on User From identity
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def delete_user(self, user_id):
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user_dn = self.user._id_to_dn(user_id)
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for ref in self.role.list_global_roles_for_user(user_dn):
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self.role.delete_user(ref.role_dn, ref.user_dn,
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self.role._dn_to_id(ref.role_dn))
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for ref in self.role.list_project_roles_for_user(user_dn,
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self.project.tree_dn):
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self.role.delete_user(ref.role_dn, ref.user_dn,
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self.role._dn_to_id(ref.role_dn))
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def delete_group(self, group_id):
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"""Called when the group was deleted.
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Any role assignments for the group should be cleaned up.
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"""
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group_dn = self.group._id_to_dn(group_id)
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group_role_assignments = self.role.list_project_roles_for_group(
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group_dn, self.project.tree_dn)
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for ref in group_role_assignments:
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self.role.delete_user(ref.role_dn, ref.group_dn,
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self.role._dn_to_id(ref.role_dn))
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def create_grant(self, role_id, user_id=None, group_id=None,
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domain_id=None, project_id=None,
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inherited_to_projects=False):
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if domain_id:
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self.get_domain(domain_id)
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if project_id:
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self.get_project(project_id)
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try:
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metadata_ref = self._get_metadata(user_id, project_id,
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domain_id, group_id)
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except exception.MetadataNotFound:
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metadata_ref = {}
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if user_id is None:
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metadata_ref['roles'] = self._add_role_to_group_and_project(
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group_id, project_id, role_id)
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else:
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metadata_ref['roles'] = self.add_role_to_user_and_project(
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user_id, project_id, role_id)
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def check_grant_role_id(self, role_id, user_id=None, group_id=None,
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domain_id=None, project_id=None,
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inherited_to_projects=False):
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if domain_id:
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self.get_domain(domain_id)
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if project_id:
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self.get_project(project_id)
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try:
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metadata_ref = self._get_metadata(user_id, project_id,
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domain_id, group_id)
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except exception.MetadataNotFound:
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metadata_ref = {}
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role_ids = set(self._roles_from_role_dicts(
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metadata_ref.get('roles', []), inherited_to_projects))
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if role_id not in role_ids:
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raise exception.RoleNotFound(role_id=role_id)
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def delete_grant(self, role_id, user_id=None, group_id=None,
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domain_id=None, project_id=None,
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inherited_to_projects=False):
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if domain_id:
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self.get_domain(domain_id)
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if project_id:
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self.get_project(project_id)
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try:
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metadata_ref = self._get_metadata(user_id, project_id,
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domain_id, group_id)
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except exception.MetadataNotFound:
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metadata_ref = {}
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try:
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if user_id is None:
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metadata_ref['roles'] = (
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self._remove_role_from_group_and_project(
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group_id, project_id, role_id))
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else:
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metadata_ref['roles'] = self.remove_role_from_user_and_project(
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user_id, project_id, role_id)
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except KeyError:
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raise exception.RoleNotFound(role_id=role_id)
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def list_grant_role_ids(self, user_id=None, group_id=None,
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domain_id=None, project_id=None,
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inherited_to_projects=False):
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if domain_id:
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self.get_domain(domain_id)
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if project_id:
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self.get_project(project_id)
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try:
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metadata_ref = self._get_metadata(user_id, project_id,
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domain_id, group_id)
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except exception.MetadataNotFound:
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metadata_ref = {}
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return self._roles_from_role_dicts(metadata_ref.get('roles', []),
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inherited_to_projects)
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def get_domain_by_name(self, domain_name):
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default_domain = assignment.calc_default_domain()
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if domain_name != default_domain['name']:
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raise exception.DomainNotFound(domain_id=domain_name)
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return default_domain
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def list_role_assignments(self):
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role_assignments = []
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for a in self.role.list_role_assignments(self.project.tree_dn):
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if isinstance(a, UserRoleAssociation):
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assignment = {
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'role_id': self.role._dn_to_id(a.role_dn),
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'user_id': self.user._dn_to_id(a.user_dn),
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'project_id': self.project._dn_to_id(a.project_dn)}
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else:
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assignment = {
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'role_id': self.role._dn_to_id(a.role_dn),
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'group_id': self.group._dn_to_id(a.group_dn),
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'project_id': self.project._dn_to_id(a.project_dn)}
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role_assignments.append(assignment)
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return role_assignments
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def delete_role_assignments(self, role_id):
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self.role.roles_delete_subtree_by_role(role_id, self.project.tree_dn)
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# TODO(termie): turn this into a data object and move logic to driver
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class ProjectApi(common_ldap.EnabledEmuMixIn, common_ldap.BaseLdap):
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DEFAULT_OU = 'ou=Groups'
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DEFAULT_STRUCTURAL_CLASSES = []
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DEFAULT_OBJECTCLASS = 'groupOfNames'
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DEFAULT_ID_ATTR = 'cn'
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DEFAULT_MEMBER_ATTRIBUTE = 'member'
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NotFound = exception.ProjectNotFound
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notfound_arg = 'project_id' # NOTE(yorik-sar): while options_name = tenant
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options_name = 'project'
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attribute_options_names = {'name': 'name',
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'description': 'desc',
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'enabled': 'enabled',
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'domain_id': 'domain_id'}
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immutable_attrs = ['name']
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model = models.Project
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def __init__(self, conf):
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super(ProjectApi, self).__init__(conf)
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self.member_attribute = (getattr(conf.ldap, 'project_member_attribute')
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or self.DEFAULT_MEMBER_ATTRIBUTE)
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def create(self, values):
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data = values.copy()
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if data.get('id') is None:
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data['id'] = uuid.uuid4().hex
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return super(ProjectApi, self).create(data)
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|
|
def get_user_projects(self, user_dn, associations):
|
|
"""Returns list of tenants a user has access to
|
|
"""
|
|
|
|
project_ids = set()
|
|
for assoc in associations:
|
|
project_ids.add(self._dn_to_id(assoc.project_dn))
|
|
projects = []
|
|
for project_id in project_ids:
|
|
# slower to get them one at a time, but a huge list could blow out
|
|
# the connection. This is the safer way
|
|
projects.append(self.get(project_id))
|
|
return projects
|
|
|
|
def get_user_dns(self, tenant_id, rolegrants, role_dn=None):
|
|
tenant = self._ldap_get(tenant_id)
|
|
res = set()
|
|
if not role_dn:
|
|
# Get users who have default tenant mapping
|
|
for user_dn in tenant[1].get(self.member_attribute, []):
|
|
if self._is_dumb_member(user_dn):
|
|
continue
|
|
res.add(user_dn)
|
|
|
|
# Get users who are explicitly mapped via a tenant
|
|
for rolegrant in rolegrants:
|
|
if role_dn is None or rolegrant.role_dn == role_dn:
|
|
res.add(rolegrant.user_dn)
|
|
return list(res)
|
|
|
|
def update(self, project_id, values):
|
|
old_obj = self.get(project_id)
|
|
return super(ProjectApi, self).update(project_id, values, old_obj)
|
|
|
|
|
|
class UserRoleAssociation(object):
|
|
"""Role Grant model."""
|
|
|
|
def __init__(self, user_dn=None, role_dn=None, tenant_dn=None,
|
|
*args, **kw):
|
|
self.user_dn = user_dn
|
|
self.role_dn = role_dn
|
|
self.project_dn = tenant_dn
|
|
|
|
|
|
class GroupRoleAssociation(object):
|
|
"""Role Grant model."""
|
|
|
|
def __init__(self, group_dn=None, role_dn=None, tenant_dn=None,
|
|
*args, **kw):
|
|
self.group_dn = group_dn
|
|
self.role_dn = role_dn
|
|
self.project_dn = tenant_dn
|
|
|
|
|
|
# TODO(termie): turn this into a data object and move logic to driver
|
|
# NOTE(heny-nash): The RoleLdapStructureMixin class enables the sharing of the
|
|
# LDAP structure between here and the role backend LDAP, no methods are shared.
|
|
class RoleApi(ldap_role.RoleLdapStructureMixin, common_ldap.BaseLdap):
|
|
|
|
def __init__(self, conf, user_api):
|
|
super(RoleApi, self).__init__(conf)
|
|
self.member_attribute = (getattr(conf.ldap, 'role_member_attribute')
|
|
or self.DEFAULT_MEMBER_ATTRIBUTE)
|
|
self._user_api = user_api
|
|
|
|
def add_user(self, role_id, role_dn, user_dn, user_id, tenant_id=None):
|
|
try:
|
|
super(RoleApi, self).add_member(user_dn, role_dn)
|
|
except exception.Conflict:
|
|
msg = (_('User %(user_id)s already has role %(role_id)s in '
|
|
'tenant %(tenant_id)s') %
|
|
dict(user_id=user_id, role_id=role_id, tenant_id=tenant_id))
|
|
raise exception.Conflict(type='role grant', details=msg)
|
|
except self.NotFound:
|
|
if tenant_id is None or self.get(role_id) is None:
|
|
raise Exception(_("Role %s not found") % (role_id,))
|
|
|
|
attrs = [('objectClass', [self.object_class]),
|
|
(self.member_attribute, [user_dn]),
|
|
(self.id_attr, [role_id])]
|
|
|
|
if self.use_dumb_member:
|
|
attrs[1][1].append(self.dumb_member)
|
|
with self.get_connection() as conn:
|
|
conn.add_s(role_dn, attrs)
|
|
|
|
def delete_user(self, role_dn, user_dn, role_id):
|
|
try:
|
|
super(RoleApi, self).remove_member(user_dn, role_dn)
|
|
except (self.NotFound, ldap.NO_SUCH_ATTRIBUTE):
|
|
raise exception.RoleNotFound(message=_(
|
|
'Cannot remove role that has not been granted, %s') %
|
|
role_id)
|
|
|
|
def get_role_assignments(self, tenant_dn):
|
|
try:
|
|
roles = self._ldap_get_list(tenant_dn, ldap.SCOPE_ONELEVEL,
|
|
attrlist=[self.member_attribute])
|
|
except ldap.NO_SUCH_OBJECT:
|
|
roles = []
|
|
res = []
|
|
for role_dn, attrs in roles:
|
|
try:
|
|
user_dns = attrs[self.member_attribute]
|
|
except KeyError:
|
|
continue
|
|
for user_dn in user_dns:
|
|
if self._is_dumb_member(user_dn):
|
|
continue
|
|
res.append(UserRoleAssociation(
|
|
user_dn=user_dn,
|
|
role_dn=role_dn,
|
|
tenant_dn=tenant_dn))
|
|
|
|
return res
|
|
|
|
def list_global_roles_for_user(self, user_dn):
|
|
user_dn_esc = ldap.filter.escape_filter_chars(user_dn)
|
|
roles = self.get_all('(%s=%s)' % (self.member_attribute, user_dn_esc))
|
|
return [UserRoleAssociation(
|
|
role_dn=role.dn,
|
|
user_dn=user_dn) for role in roles]
|
|
|
|
def list_project_roles_for_user(self, user_dn, project_subtree):
|
|
try:
|
|
roles = self._ldap_get_list(project_subtree, ldap.SCOPE_SUBTREE,
|
|
query_params={
|
|
self.member_attribute: user_dn},
|
|
attrlist=common_ldap.DN_ONLY)
|
|
except ldap.NO_SUCH_OBJECT:
|
|
roles = []
|
|
res = []
|
|
for role_dn, _role_attrs in roles:
|
|
# ldap.dn.dn2str returns an array, where the first
|
|
# element is the first segment.
|
|
# For a role assignment, this contains the role ID,
|
|
# The remainder is the DN of the tenant.
|
|
# role_dn is already utf8 encoded since it came from LDAP.
|
|
tenant = ldap.dn.str2dn(role_dn)
|
|
tenant.pop(0)
|
|
tenant_dn = ldap.dn.dn2str(tenant)
|
|
res.append(UserRoleAssociation(
|
|
user_dn=user_dn,
|
|
role_dn=role_dn,
|
|
tenant_dn=tenant_dn))
|
|
return res
|
|
|
|
def list_project_roles_for_group(self, group_dn, project_subtree):
|
|
group_dn_esc = ldap.filter.escape_filter_chars(group_dn)
|
|
query = '(&(objectClass=%s)(%s=%s))' % (self.object_class,
|
|
self.member_attribute,
|
|
group_dn_esc)
|
|
with self.get_connection() as conn:
|
|
try:
|
|
roles = conn.search_s(project_subtree,
|
|
ldap.SCOPE_SUBTREE,
|
|
query,
|
|
attrlist=common_ldap.DN_ONLY)
|
|
except ldap.NO_SUCH_OBJECT:
|
|
# Return no roles rather than raise an exception if the project
|
|
# subtree entry doesn't exist because an empty subtree is not
|
|
# an error.
|
|
return []
|
|
|
|
res = []
|
|
for role_dn, _role_attrs in roles:
|
|
# ldap.dn.str2dn returns a list, where the first
|
|
# element is the first RDN.
|
|
# For a role assignment, this contains the role ID,
|
|
# the remainder is the DN of the project.
|
|
# role_dn is already utf8 encoded since it came from LDAP.
|
|
project = ldap.dn.str2dn(role_dn)
|
|
project.pop(0)
|
|
project_dn = ldap.dn.dn2str(project)
|
|
res.append(GroupRoleAssociation(
|
|
group_dn=group_dn,
|
|
role_dn=role_dn,
|
|
tenant_dn=project_dn))
|
|
return res
|
|
|
|
def roles_delete_subtree_by_project(self, tenant_dn):
|
|
self._delete_tree_nodes(tenant_dn, ldap.SCOPE_ONELEVEL)
|
|
|
|
def roles_delete_subtree_by_role(self, role_id, tree_dn):
|
|
self._delete_tree_nodes(tree_dn, ldap.SCOPE_SUBTREE, query_params={
|
|
self.id_attr: role_id})
|
|
|
|
def list_role_assignments(self, project_tree_dn):
|
|
"""Returns a list of all the role assignments linked to project_tree_dn
|
|
attribute.
|
|
"""
|
|
try:
|
|
roles = self._ldap_get_list(project_tree_dn, ldap.SCOPE_SUBTREE,
|
|
attrlist=[self.member_attribute])
|
|
except ldap.NO_SUCH_OBJECT:
|
|
roles = []
|
|
res = []
|
|
for role_dn, role in roles:
|
|
# role_dn is already utf8 encoded since it came from LDAP.
|
|
tenant = ldap.dn.str2dn(role_dn)
|
|
tenant.pop(0)
|
|
# It obtains the tenant DN to construct the UserRoleAssociation
|
|
# object.
|
|
tenant_dn = ldap.dn.dn2str(tenant)
|
|
for occupant_dn in role[self.member_attribute]:
|
|
if self._is_dumb_member(occupant_dn):
|
|
continue
|
|
if self._user_api.is_user(occupant_dn):
|
|
association = UserRoleAssociation(
|
|
user_dn=occupant_dn,
|
|
role_dn=role_dn,
|
|
tenant_dn=tenant_dn)
|
|
else:
|
|
# occupant_dn is a group.
|
|
association = GroupRoleAssociation(
|
|
group_dn=occupant_dn,
|
|
role_dn=role_dn,
|
|
tenant_dn=tenant_dn)
|
|
res.append(association)
|
|
return res
|