# 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.

from oslo_policy import policy

from keystone.common.policies import base


resource_paths = [
    '/projects/{project_id}/users/{user_id}/roles/{role_id}',
    '/projects/{project_id}/groups/{group_id}/roles/{role_id}',
    '/domains/{domain_id}/users/{user_id}/roles/{role_id}',
    '/domains/{domain_id}/groups/{group_id}/roles/{role_id}',
]


resource_paths += ['/OS-INHERIT' + path + '/inherited_to_projects'
                   for path in resource_paths]


collection_paths = [
    '/projects/{project_id}/users/{user_id}/roles',
    '/projects/{project_id}/groups/{group_id}/roles',
    '/domains/{domain_id}/users/{user_id}/roles',
    '/domains/{domain_id}/groups/{group_id}/roles'
]


inherited_collection_paths = [
    ('/OS-INHERIT/domains/{domain_id}/groups/{group_id}/roles/'
     'inherited_to_projects'),
    ('/OS-INHERIT/domains/{domain_id}/users/{user_id}/roles/'
     'inherited_to_projects')
]


def list_operations(paths, methods):
    return [{'path': '/v3' + path, 'method': method}
            for path in paths for method in methods]


# NOTE(samueldmq): Unlike individual resource paths, collection
# paths for the inherited grants do not contain a HEAD API
list_grants_operations = (
    list_operations(collection_paths, ['GET', 'HEAD']) +
    list_operations(inherited_collection_paths, ['GET']))


grant_policies = [
    policy.DocumentedRuleDefault(
        name=base.IDENTITY % 'check_grant',
        check_str=base.RULE_ADMIN_REQUIRED,
        description=('Check a role grant between a target and an actor. A '
                     'target can be either a domain or a project. An actor '
                     'can be either a user or a group. These terms also apply '
                     'to the OS-INHERIT APIs, where grants on the target '
                     'are inherited to all projects in the subtree, if '
                     'applicable.'),
        operations=list_operations(resource_paths, ['HEAD', 'GET'])),
    policy.DocumentedRuleDefault(
        name=base.IDENTITY % 'list_grants',
        check_str=base.RULE_ADMIN_REQUIRED,
        description=('List roles granted to an actor on a target. A target '
                     'can be either a domain or a project. An actor can be '
                     'either a user or a group. For the OS-INHERIT APIs, it '
                     'is possible to list inherited role grants for actors on '
                     'domains, where grants are inherited to all projects '
                     'in the specified domain.'),
        operations=list_grants_operations),
    policy.DocumentedRuleDefault(
        name=base.IDENTITY % 'create_grant',
        check_str=base.RULE_ADMIN_REQUIRED,
        description=('Create a role grant between a target and an actor. A '
                     'target can be either a domain or a project. An actor '
                     'can be either a user or a group. These terms also apply '
                     'to the OS-INHERIT APIs, where grants on the target '
                     'are inherited to all projects in the subtree, if '
                     'applicable.'),
        operations=list_operations(resource_paths, ['PUT'])),
    policy.DocumentedRuleDefault(
        name=base.IDENTITY % 'revoke_grant',
        check_str=base.RULE_ADMIN_REQUIRED,
        description=('Revoke a role grant between a target and an actor. A '
                     'target can be either a domain or a project. An actor '
                     'can be either a user or a group. These terms also apply '
                     'to the OS-INHERIT APIs, where grants on the target '
                     'are inherited to all projects in the subtree, if '
                     'applicable. In that case, revoking the role grant in '
                     'the target would remove the logical effect of '
                     'inheriting it to the target\'s projects subtree.'),
        operations=list_operations(resource_paths, ['DELETE']))
]


def list_rules():
    return grant_policies