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+# Copyright (c) 2011 OpenStack Foundation
+# Copyright 2013 IBM Corp.
+# 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.
+
+"""Policy Engine For Escalator"""
+
+
+from oslo_config import cfg
+from oslo_log import log as logging
+from oslo_policy import policy
+
+from escalator.common import exception
+from escalator import i18n
+
+
+LOG = logging.getLogger(__name__)
+CONF = cfg.CONF
+
+DEFAULT_RULES = policy.Rules.from_dict({
+ 'context_is_admin': 'role:admin',
+ 'default': '@',
+ 'manage_image_cache': 'role:admin',
+})
+
+_ = i18n._
+_LI = i18n._LI
+_LW = i18n._LW
+
+
+class Enforcer(policy.Enforcer):
+ """Responsible for loading and enforcing rules"""
+
+ def __init__(self):
+ if CONF.find_file(CONF.oslo_policy.policy_file):
+ kwargs = dict(rules=None, use_conf=True)
+ else:
+ kwargs = dict(rules=DEFAULT_RULES, use_conf=False)
+ super(Enforcer, self).__init__(CONF, overwrite=False, **kwargs)
+
+ def add_rules(self, rules):
+ """Add new rules to the Rules object"""
+ self.set_rules(rules, overwrite=False, use_conf=self.use_conf)
+
+ def enforce(self, context, action, target):
+ """Verifies that the action is valid on the target in this context.
+
+ :param context: Escalator request context
+ :param action: String representing the action to be checked
+ :param target: Dictionary representing the object of the action.
+ :raises: `escalator.common.exception.Forbidden`
+ :returns: A non-False value if access is allowed.
+ """
+ credentials = {
+ 'roles': context.roles,
+ 'user': context.user,
+ 'tenant': context.tenant,
+ }
+ return super(Enforcer, self).enforce(action, target, credentials,
+ do_raise=True,
+ exc=exception.Forbidden,
+ action=action)
+
+ def check(self, context, action, target):
+ """Verifies that the action is valid on the target in this context.
+
+ :param context: Escalator request context
+ :param action: String representing the action to be checked
+ :param target: Dictionary representing the object of the action.
+ :returns: A non-False value if access is allowed.
+ """
+ credentials = {
+ 'roles': context.roles,
+ 'user': context.user,
+ 'tenant': context.tenant,
+ }
+ return super(Enforcer, self).enforce(action, target, credentials)
+
+ def check_is_admin(self, context):
+ """Check if the given context is associated with an admin role,
+ as defined via the 'context_is_admin' RBAC rule.
+
+ :param context: Escalator request context
+ :returns: A non-False value if context role is admin.
+ """
+ return self.check(context, 'context_is_admin', context.to_dict())