#
# Copyright 2013 OpenStack Foundation
#
# 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 keystoneclient.exceptions import Unauthorized
from keystoneclient.v2_0 import client as keystone_client
import webob

from heat.common.auth_password import KeystonePasswordAuthProtocol
from heat.tests.common import HeatTestCase

EXPECTED_V2_DEFAULT_ENV_RESPONSE = {
    'HTTP_X_IDENTITY_STATUS': 'Confirmed',
    'HTTP_X_TENANT_ID': 'tenant_id1',
    'HTTP_X_TENANT_NAME': 'tenant_name1',
    'HTTP_X_USER_ID': 'user_id1',
    'HTTP_X_USER_NAME': 'user_name1',
    'HTTP_X_ROLES': 'role1,role2',
    'HTTP_X_USER': 'user_name1',  # deprecated (diablo-compat)
    'HTTP_X_TENANT': 'tenant_name1',  # deprecated (diablo-compat)
    'HTTP_X_ROLE': 'role1,role2',  # deprecated (diablo-compat)
}

TOKEN_RESPONSE = {
    'token': {
        'id': 'lalalalalala',
        'expires': '2020-01-01T00:00:10.000123Z',
        'tenant': {
            'id': 'tenant_id1',
            'name': 'tenant_name1',
        },
    },
    'user': {
        'id': 'user_id1',
        'name': 'user_name1',
        'roles': [
            {'name': 'role1'},
            {'name': 'role2'},
        ],
    },
    'serviceCatalog': {}
}


class FakeApp(object):
    """This represents a WSGI app protected by our auth middleware."""

    def __init__(self, expected_env=None):
        expected_env = expected_env or {}
        self.expected_env = dict(EXPECTED_V2_DEFAULT_ENV_RESPONSE)
        self.expected_env.update(expected_env)

    def __call__(self, env, start_response):
        """Assert that expected environment is present when finally called."""
        for k, v in self.expected_env.items():
            assert env[k] == v, '%s != %s' % (env[k], v)
        resp = webob.Response()
        resp.body = 'SUCCESS'
        return resp(env, start_response)


class KeystonePasswordAuthProtocolTest(HeatTestCase):

    def setUp(self):
        super(KeystonePasswordAuthProtocolTest, self).setUp()
        self.config = {'auth_uri': 'http://keystone.test.com:5000'}
        self.app = FakeApp(
            expected_env={'HTTP_X_AUTH_URL': self.config['auth_uri']})
        self.middleware = KeystonePasswordAuthProtocol(self.app, self.config)

    def _start_fake_response(self, status, headers):
        self.response_status = int(status.split(' ', 1)[0])
        self.response_headers = dict(headers)

    def test_valid_request(self):
        mock_client = self.m.CreateMock(keystone_client.Client)
        self.m.StubOutWithMock(keystone_client, 'Client')
        keystone_client.Client(
            username='user_name1', password='goodpassword',
            tenant_id='tenant_id1',
            auth_url=self.config['auth_uri']).AndReturn(mock_client)
        mock_client.auth_ref = TOKEN_RESPONSE
        self.m.ReplayAll()
        req = webob.Request.blank('/tenant_id1/')
        req.headers['X_AUTH_USER'] = 'user_name1'
        req.headers['X_AUTH_KEY'] = 'goodpassword'
        req.headers['X_AUTH_URL'] = self.config['auth_uri']
        self.middleware(req.environ, self._start_fake_response)
        self.m.VerifyAll()

    def test_request_with_bad_credentials(self):
        self.m.StubOutWithMock(
            keystone_client, 'Client', use_mock_anything=True)
        mock_client = keystone_client.Client(
            username='user_name1', password='badpassword',
            tenant_id='tenant_id1', auth_url=self.config['auth_uri'])
        mock_client.AndRaise(Unauthorized(401))
        self.m.ReplayAll()
        req = webob.Request.blank('/tenant_id1/')
        req.headers['X_AUTH_USER'] = 'user_name1'
        req.headers['X_AUTH_KEY'] = 'badpassword'
        req.headers['X_AUTH_URL'] = self.config['auth_uri']
        self.middleware(req.environ, self._start_fake_response)
        self.m.VerifyAll()
        self.assertEqual(401, self.response_status)

    def test_request_with_no_tenant_in_url_or_auth_headers(self):
        req = webob.Request.blank('/')
        self.middleware(req.environ, self._start_fake_response)
        self.assertEqual(401, self.response_status)