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# Copyright 2014 IBM Corp.
#
# 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 uuid
import sqlalchemy
from keystone.common import sql
from keystone import exception
class PolicyAssociation(sql.ModelBase, sql.ModelDictMixin):
__tablename__ = 'policy_association'
attributes = ['policy_id', 'endpoint_id', 'region_id', 'service_id']
# The id column is never exposed outside this module. It only exists to
# provide a primary key, given that the real columns we would like to use
# (endpoint_id, service_id, region_id) can be null
id = sql.Column(sql.String(64), primary_key=True)
policy_id = sql.Column(sql.String(64), nullable=False)
endpoint_id = sql.Column(sql.String(64), nullable=True)
service_id = sql.Column(sql.String(64), nullable=True)
region_id = sql.Column(sql.String(64), nullable=True)
__table_args__ = (sql.UniqueConstraint('endpoint_id', 'service_id',
'region_id'),)
def to_dict(self):
"""Returns the model's attributes as a dictionary.
We override the standard method in order to hide the id column,
since this only exists to provide the table with a primary key.
"""
d = {}
for attr in self.__class__.attributes:
d[attr] = getattr(self, attr)
return d
class EndpointPolicy(object):
def create_policy_association(self, policy_id, endpoint_id=None,
service_id=None, region_id=None):
with sql.session_for_write() as session:
try:
# See if there is already a row for this association, and if
# so, update it with the new policy_id
query = session.query(PolicyAssociation)
query = query.filter_by(endpoint_id=endpoint_id)
query = query.filter_by(service_id=service_id)
query = query.filter_by(region_id=region_id)
association = query.one()
association.policy_id = policy_id
except sql.NotFound:
association = PolicyAssociation(id=uuid.uuid4().hex,
policy_id=policy_id,
endpoint_id=endpoint_id,
service_id=service_id,
region_id=region_id)
session.add(association)
def check_policy_association(self, policy_id, endpoint_id=None,
service_id=None, region_id=None):
sql_constraints = sqlalchemy.and_(
PolicyAssociation.policy_id == policy_id,
PolicyAssociation.endpoint_id == endpoint_id,
PolicyAssociation.service_id == service_id,
PolicyAssociation.region_id == region_id)
# NOTE(henry-nash): Getting a single value to save object
# management overhead.
with sql.session_for_read() as session:
if session.query(PolicyAssociation.id).filter(
sql_constraints).distinct().count() == 0:
raise exception.PolicyAssociationNotFound()
def delete_policy_association(self, policy_id, endpoint_id=None,
service_id=None, region_id=None):
with sql.session_for_write() as session:
query = session.query(PolicyAssociation)
query = query.filter_by(policy_id=policy_id)
query = query.filter_by(endpoint_id=endpoint_id)
query = query.filter_by(service_id=service_id)
query = query.filter_by(region_id=region_id)
query.delete()
def get_policy_association(self, endpoint_id=None,
service_id=None, region_id=None):
sql_constraints = sqlalchemy.and_(
PolicyAssociation.endpoint_id == endpoint_id,
PolicyAssociation.service_id == service_id,
PolicyAssociation.region_id == region_id)
try:
with sql.session_for_read() as session:
policy_id = session.query(PolicyAssociation.policy_id).filter(
sql_constraints).distinct().one()
return {'policy_id': policy_id}
except sql.NotFound:
raise exception.PolicyAssociationNotFound()
def list_associations_for_policy(self, policy_id):
with sql.session_for_read() as session:
query = session.query(PolicyAssociation)
query = query.filter_by(policy_id=policy_id)
return [ref.to_dict() for ref in query.all()]
def delete_association_by_endpoint(self, endpoint_id):
with sql.session_for_write() as session:
query = session.query(PolicyAssociation)
query = query.filter_by(endpoint_id=endpoint_id)
query.delete()
def delete_association_by_service(self, service_id):
with sql.session_for_write() as session:
query = session.query(PolicyAssociation)
query = query.filter_by(service_id=service_id)
query.delete()
def delete_association_by_region(self, region_id):
with sql.session_for_write() as session:
query = session.query(PolicyAssociation)
query = query.filter_by(region_id=region_id)
query.delete()
def delete_association_by_policy(self, policy_id):
with sql.session_for_write() as session:
query = session.query(PolicyAssociation)
query = query.filter_by(policy_id=policy_id)
query.delete()
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