# Copyright (c) 2013 Bull.
#
# 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.

"""Test of Policy Engine For Climate."""

from oslo.config import cfg

from climate import context
from climate import exceptions
from climate import policy
from climate import tests

CONF = cfg.CONF


class DefaultPolicyTestCase(tests.TestCase):

    def setUp(self):
        super(DefaultPolicyTestCase, self).setUp()

        self.rules = """
        {
            "default": "",
            "example:exist": "!",
            "example:allowed": "@",
            "example:my_file": "role:admin or \
                               project_id:%(project_id)s"
        }
        """

        self.default_rule = None
        policy.reset()
        self.read_cached_file.return_value = (True, self.rules)
        self.context = context.ClimateContext(user_id='fake',
                                              project_id='fake',
                                              roles=['member'])

    def _set_rules(self, default_rule):
        self.default_rule = default_rule
        policy.set_rules(self.rules, default_rule)

    def test_policy_called(self):
        self.assertRaises(exceptions.PolicyNotAuthorized, policy.enforce,
                          self.context, "example:exist", {})

    def test_not_found_policy_calls_default(self):
        result = policy.enforce(self.context, "example:noexist", {}, False)
        self.assertEqual(result, True)

    def test_default_not_found(self):
        self._set_rules("default_noexist")
        self.assertRaises(exceptions.PolicyNotAuthorized, policy.enforce,
                          self.context, "example:noexist", {})

    def test_enforce_good_action(self):
        action = "example:allowed"
        result = policy.enforce(self.context, action, {}, False)
        self.assertEqual(result, True)

    def test_templatized_enforcement(self):
        target_mine = {'project_id': 'fake'}
        target_not_mine = {'project_id': 'another'}
        action = "example:my_file"
        policy.enforce(self.context, action, target_mine)
        self.assertRaises(exceptions.PolicyNotAuthorized, policy.enforce,
                          self.context, action, target_not_mine)


class ClimatePolicyTestCase(tests.TestCase):

    def setUp(self):
        super(ClimatePolicyTestCase, self).setUp()

        self.context = context.ClimateContext(user_id='fake',
                                              project_id='fake',
                                              roles=['member'])

    def test_standardpolicy(self):
        target_good = {'user_id': self.context.user_id,
                       'project_id': self.context.project_id}
        target_wrong = {'user_id': self.context.user_id,
                        'project_id': 'bad_project'}
        action = "climate:leases"
        self.assertEqual(True, policy.enforce(self.context, action,
                                              target_good))
        self.assertEqual(False, policy.enforce(self.context, action,
                                               target_wrong, False))

    def test_adminpolicy(self):
        target = {'user_id': self.context.user_id,
                  'project_id': self.context.project_id}
        action = "climate:oshosts"
        self.assertRaises(exceptions.PolicyNotAuthorized, policy.enforce,
                          self.context, action, target)

    def test_elevatedpolicy(self):
        target = {'user_id': self.context.user_id,
                  'project_id': self.context.project_id}
        action = "climate:oshosts"
        self.assertRaises(exceptions.PolicyNotAuthorized, policy.enforce,
                          self.context, action, target)
        elevated_context = self.context.elevated()
        self.assertEqual(True,
                         policy.enforce(elevated_context, action, target))

    def test_authorize(self):

        @policy.authorize('leases', ctx=self.context)
        def user_method(self):
            return True

        @policy.authorize('leases', 'get', ctx=self.context)
        def user_method_with_action(self):
            return True

        @policy.authorize('oshosts', ctx=self.context)
        def adminonly_method(self):
            return True

        self.assertEqual(True, user_method(self))
        self.assertEqual(True, user_method_with_action(self))
        try:
            adminonly_method(self)
            self.assertTrue(False)
        except exceptions.PolicyNotAuthorized:
            # We are expecting this exception
            self.assertTrue(True)