# 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 json
import ssl
import sys
import unittest

import mock
from oslo_utils import uuidutils

from ironic_inspector.common import ironic as ir_utils
from ironic_inspector import conf
from ironic_inspector import db
from ironic_inspector import firewall
from ironic_inspector import introspect
from ironic_inspector import main
from ironic_inspector import node_cache
from ironic_inspector.plugins import base as plugins_base
from ironic_inspector.plugins import example as example_plugin
from ironic_inspector import process
from ironic_inspector import rules
from ironic_inspector.test import base as test_base
from ironic_inspector import utils
from oslo_config import cfg

CONF = cfg.CONF


def _get_error(res):
    return json.loads(res.data.decode('utf-8'))['error']['message']


class BaseAPITest(test_base.BaseTest):
    def setUp(self):
        super(BaseAPITest, self).setUp()
        main.app.config['TESTING'] = True
        self.app = main.app.test_client()
        CONF.set_override('auth_strategy', 'noauth')
        self.uuid = uuidutils.generate_uuid()


class TestApiIntrospect(BaseAPITest):
    @mock.patch.object(introspect, 'introspect', autospec=True)
    def test_introspect_no_authentication(self, introspect_mock):
        CONF.set_override('auth_strategy', 'noauth')
        res = self.app.post('/v1/introspection/%s' % self.uuid)
        self.assertEqual(202, res.status_code)
        introspect_mock.assert_called_once_with(self.uuid,
                                                new_ipmi_credentials=None,
                                                token=None)

    @mock.patch.object(introspect, 'introspect', autospec=True)
    def test_introspect_set_ipmi_credentials(self, introspect_mock):
        res = self.app.post('/v1/introspection/%s?new_ipmi_username=user&'
                            'new_ipmi_password=password' % self.uuid)
        self.assertEqual(202, res.status_code)
        introspect_mock.assert_called_once_with(
            self.uuid,
            new_ipmi_credentials=('user', 'password'),
            token=None)

    @mock.patch.object(introspect, 'introspect', autospec=True)
    def test_introspect_set_ipmi_credentials_no_user(self, introspect_mock):
        res = self.app.post('/v1/introspection/%s?'
                            'new_ipmi_password=password' % self.uuid)
        self.assertEqual(202, res.status_code)
        introspect_mock.assert_called_once_with(
            self.uuid,
            new_ipmi_credentials=(None, 'password'),
            token=None)

    @mock.patch.object(introspect, 'introspect', autospec=True)
    def test_intospect_failed(self, introspect_mock):
        introspect_mock.side_effect = utils.Error("boom")
        res = self.app.post('/v1/introspection/%s' % self.uuid)
        self.assertEqual(400, res.status_code)
        self.assertEqual(
            'boom',
            json.loads(res.data.decode('utf-8'))['error']['message'])
        introspect_mock.assert_called_once_with(
            self.uuid,
            new_ipmi_credentials=None,
            token=None)

    @mock.patch.object(utils, 'check_auth', autospec=True)
    @mock.patch.object(introspect, 'introspect', autospec=True)
    def test_introspect_failed_authentication(self, introspect_mock,
                                              auth_mock):
        CONF.set_override('auth_strategy', 'keystone')
        auth_mock.side_effect = utils.Error('Boom', code=403)
        res = self.app.post('/v1/introspection/%s' % self.uuid,
                            headers={'X-Auth-Token': 'token'})
        self.assertEqual(403, res.status_code)
        self.assertFalse(introspect_mock.called)


@mock.patch.object(process, 'process', autospec=True)
class TestApiContinue(BaseAPITest):
    def test_continue(self, process_mock):
        # should be ignored
        CONF.set_override('auth_strategy', 'keystone')
        process_mock.return_value = {'result': 42}
        res = self.app.post('/v1/continue', data='{"foo": "bar"}')
        self.assertEqual(200, res.status_code)
        process_mock.assert_called_once_with({"foo": "bar"})
        self.assertEqual({"result": 42}, json.loads(res.data.decode()))

    def test_continue_failed(self, process_mock):
        process_mock.side_effect = utils.Error("boom")
        res = self.app.post('/v1/continue', data='{"foo": "bar"}')
        self.assertEqual(400, res.status_code)
        process_mock.assert_called_once_with({"foo": "bar"})
        self.assertEqual('boom', _get_error(res))

    def test_continue_wrong_type(self, process_mock):
        res = self.app.post('/v1/continue', data='42')
        self.assertEqual(400, res.status_code)
        self.assertEqual('Invalid data: expected a JSON object, got int',
                         _get_error(res))
        self.assertFalse(process_mock.called)


@mock.patch.object(introspect, 'abort', autospec=True)
class TestApiAbort(BaseAPITest):
    def test_ok(self, abort_mock):
        abort_mock.return_value = '', 202

        res = self.app.post('/v1/introspection/%s/abort' % self.uuid,
                            headers={'X-Auth-Token': 'token'})

        abort_mock.assert_called_once_with(self.uuid, token='token')
        self.assertEqual(202, res.status_code)
        self.assertEqual(b'', res.data)

    def test_no_authentication(self, abort_mock):
        abort_mock.return_value = b'', 202

        res = self.app.post('/v1/introspection/%s/abort' % self.uuid)

        abort_mock.assert_called_once_with(self.uuid, token=None)
        self.assertEqual(202, res.status_code)
        self.assertEqual(b'', res.data)

    def test_node_not_found(self, abort_mock):
        exc = utils.Error("Not Found.", code=404)
        abort_mock.side_effect = exc

        res = self.app.post('/v1/introspection/%s/abort' % self.uuid)

        abort_mock.assert_called_once_with(self.uuid, token=None)
        self.assertEqual(404, res.status_code)
        data = json.loads(str(res.data.decode()))
        self.assertEqual(str(exc), data['error']['message'])

    def test_abort_failed(self, abort_mock):
        exc = utils.Error("Locked.", code=409)
        abort_mock.side_effect = exc

        res = self.app.post('/v1/introspection/%s/abort' % self.uuid)

        abort_mock.assert_called_once_with(self.uuid, token=None)
        self.assertEqual(409, res.status_code)
        data = json.loads(res.data.decode())
        self.assertEqual(str(exc), data['error']['message'])


class TestApiGetStatus(BaseAPITest):
    @mock.patch.object(node_cache, 'get_node', autospec=True)
    def test_get_introspection_in_progress(self, get_mock):
        get_mock.return_value = node_cache.NodeInfo(uuid=self.uuid,
                                                    started_at=42.0)
        res = self.app.get('/v1/introspection/%s' % self.uuid)
        self.assertEqual(200, res.status_code)
        self.assertEqual({'finished': False, 'error': None},
                         json.loads(res.data.decode('utf-8')))

    @mock.patch.object(node_cache, 'get_node', autospec=True)
    def test_get_introspection_finished(self, get_mock):
        get_mock.return_value = node_cache.NodeInfo(uuid=self.uuid,
                                                    started_at=42.0,
                                                    finished_at=100.1,
                                                    error='boom')
        res = self.app.get('/v1/introspection/%s' % self.uuid)
        self.assertEqual(200, res.status_code)
        self.assertEqual({'finished': True, 'error': 'boom'},
                         json.loads(res.data.decode('utf-8')))


class TestApiGetData(BaseAPITest):
    @mock.patch.object(main.swift, 'SwiftAPI', autospec=True)
    def test_get_introspection_data(self, swift_mock):
        CONF.set_override('store_data', 'swift', 'processing')
        data = {
            'ipmi_address': '1.2.3.4',
            'cpus': 2,
            'cpu_arch': 'x86_64',
            'memory_mb': 1024,
            'local_gb': 20,
            'interfaces': {
                'em1': {'mac': '11:22:33:44:55:66', 'ip': '1.2.0.1'},
            }
        }
        swift_conn = swift_mock.return_value
        swift_conn.get_object.return_value = json.dumps(data)
        res = self.app.get('/v1/introspection/%s/data' % self.uuid)
        name = 'inspector_data-%s' % self.uuid
        swift_conn.get_object.assert_called_once_with(name)
        self.assertEqual(200, res.status_code)
        self.assertEqual(data, json.loads(res.data.decode('utf-8')))

    @mock.patch.object(main.swift, 'SwiftAPI', autospec=True)
    def test_introspection_data_not_stored(self, swift_mock):
        CONF.set_override('store_data', 'none', 'processing')
        swift_conn = swift_mock.return_value
        res = self.app.get('/v1/introspection/%s/data' % self.uuid)
        self.assertFalse(swift_conn.get_object.called)
        self.assertEqual(404, res.status_code)

    @mock.patch.object(ir_utils, 'get_node', autospec=True)
    @mock.patch.object(main.swift, 'SwiftAPI', autospec=True)
    def test_with_name(self, swift_mock, get_mock):
        get_mock.return_value = mock.Mock(uuid=self.uuid)
        CONF.set_override('store_data', 'swift', 'processing')
        data = {
            'ipmi_address': '1.2.3.4',
            'cpus': 2,
            'cpu_arch': 'x86_64',
            'memory_mb': 1024,
            'local_gb': 20,
            'interfaces': {
                'em1': {'mac': '11:22:33:44:55:66', 'ip': '1.2.0.1'},
            }
        }
        swift_conn = swift_mock.return_value
        swift_conn.get_object.return_value = json.dumps(data)
        res = self.app.get('/v1/introspection/name1/data')
        name = 'inspector_data-%s' % self.uuid
        swift_conn.get_object.assert_called_once_with(name)
        self.assertEqual(200, res.status_code)
        self.assertEqual(data, json.loads(res.data.decode('utf-8')))
        get_mock.assert_called_once_with('name1', fields=['uuid'])


@mock.patch.object(process, 'reapply', autospec=True)
class TestApiReapply(BaseAPITest):

    def setUp(self):
        super(TestApiReapply, self).setUp()
        CONF.set_override('store_data', 'swift', 'processing')

    def test_ok(self, reapply_mock):

        self.app.post('/v1/introspection/%s/data/unprocessed' %
                      self.uuid)
        reapply_mock.assert_called_once_with(self.uuid)

    def test_user_data(self, reapply_mock):
        res = self.app.post('/v1/introspection/%s/data/unprocessed' %
                            self.uuid, data='some data')
        self.assertEqual(400, res.status_code)
        message = json.loads(res.data.decode())['error']['message']
        self.assertEqual('User data processing is not supported yet',
                         message)
        self.assertFalse(reapply_mock.called)

    def test_swift_disabled(self, reapply_mock):
        CONF.set_override('store_data', 'none', 'processing')

        res = self.app.post('/v1/introspection/%s/data/unprocessed' %
                            self.uuid)
        self.assertEqual(400, res.status_code)
        message = json.loads(res.data.decode())['error']['message']
        self.assertEqual('Inspector is not configured to store '
                         'data. Set the [processing] store_data '
                         'configuration option to change this.',
                         message)
        self.assertFalse(reapply_mock.called)

    def test_node_locked(self, reapply_mock):
        exc = utils.Error('Locked.', code=409)
        reapply_mock.side_effect = exc

        res = self.app.post('/v1/introspection/%s/data/unprocessed' %
                            self.uuid)

        self.assertEqual(409, res.status_code)
        message = json.loads(res.data.decode())['error']['message']
        self.assertEqual(str(exc), message)
        reapply_mock.assert_called_once_with(self.uuid)

    def test_node_not_found(self, reapply_mock):
        exc = utils.Error('Not found.', code=404)
        reapply_mock.side_effect = exc

        res = self.app.post('/v1/introspection/%s/data/unprocessed' %
                            self.uuid)

        self.assertEqual(404, res.status_code)
        message = json.loads(res.data.decode())['error']['message']
        self.assertEqual(str(exc), message)
        reapply_mock.assert_called_once_with(self.uuid)

    def test_generic_error(self, reapply_mock):
        exc = utils.Error('Oops', code=400)
        reapply_mock.side_effect = exc

        res = self.app.post('/v1/introspection/%s/data/unprocessed' %
                            self.uuid)

        self.assertEqual(400, res.status_code)
        message = json.loads(res.data.decode())['error']['message']
        self.assertEqual(str(exc), message)
        reapply_mock.assert_called_once_with(self.uuid)


class TestApiRules(BaseAPITest):
    @mock.patch.object(rules, 'get_all')
    def test_get_all(self, get_all_mock):
        get_all_mock.return_value = [
            mock.Mock(spec=rules.IntrospectionRule,
                      **{'as_dict.return_value': {'uuid': 'foo'}}),
            mock.Mock(spec=rules.IntrospectionRule,
                      **{'as_dict.return_value': {'uuid': 'bar'}}),
        ]

        res = self.app.get('/v1/rules')
        self.assertEqual(200, res.status_code)
        self.assertEqual(
            {
                'rules': [{'uuid': 'foo',
                           'links': [
                               {'href': '/v1/rules/foo', 'rel': 'self'}
                           ]},
                          {'uuid': 'bar',
                           'links': [
                               {'href': '/v1/rules/bar', 'rel': 'self'}
                           ]}]
            },
            json.loads(res.data.decode('utf-8')))
        get_all_mock.assert_called_once_with()
        for m in get_all_mock.return_value:
            m.as_dict.assert_called_with(short=True)

    @mock.patch.object(rules, 'delete_all')
    def test_delete_all(self, delete_all_mock):
        res = self.app.delete('/v1/rules')
        self.assertEqual(204, res.status_code)
        delete_all_mock.assert_called_once_with()

    @mock.patch.object(rules, 'create', autospec=True)
    def test_create(self, create_mock):
        data = {'uuid': self.uuid,
                'conditions': 'cond',
                'actions': 'act'}
        exp = data.copy()
        exp['description'] = None
        create_mock.return_value = mock.Mock(spec=rules.IntrospectionRule,
                                             **{'as_dict.return_value': exp})

        res = self.app.post('/v1/rules', data=json.dumps(data))
        self.assertEqual(201, res.status_code)
        create_mock.assert_called_once_with(conditions_json='cond',
                                            actions_json='act',
                                            uuid=self.uuid,
                                            description=None)
        self.assertEqual(exp, json.loads(res.data.decode('utf-8')))

    @mock.patch.object(rules, 'create', autospec=True)
    def test_create_api_less_1_6(self, create_mock):
        data = {'uuid': self.uuid,
                'conditions': 'cond',
                'actions': 'act'}
        exp = data.copy()
        exp['description'] = None
        create_mock.return_value = mock.Mock(spec=rules.IntrospectionRule,
                                             **{'as_dict.return_value': exp})

        headers = {conf.VERSION_HEADER:
                   main._format_version((1, 5))}

        res = self.app.post('/v1/rules', data=json.dumps(data),
                            headers=headers)
        self.assertEqual(200, res.status_code)
        create_mock.assert_called_once_with(conditions_json='cond',
                                            actions_json='act',
                                            uuid=self.uuid,
                                            description=None)
        self.assertEqual(exp, json.loads(res.data.decode('utf-8')))

    @mock.patch.object(rules, 'create', autospec=True)
    def test_create_bad_uuid(self, create_mock):
        data = {'uuid': 'foo',
                'conditions': 'cond',
                'actions': 'act'}

        res = self.app.post('/v1/rules', data=json.dumps(data))
        self.assertEqual(400, res.status_code)

    @mock.patch.object(rules, 'get')
    def test_get_one(self, get_mock):
        get_mock.return_value = mock.Mock(spec=rules.IntrospectionRule,
                                          **{'as_dict.return_value':
                                             {'uuid': 'foo'}})

        res = self.app.get('/v1/rules/' + self.uuid)
        self.assertEqual(200, res.status_code)
        self.assertEqual({'uuid': 'foo',
                          'links': [
                              {'href': '/v1/rules/foo', 'rel': 'self'}
                          ]},
                         json.loads(res.data.decode('utf-8')))
        get_mock.assert_called_once_with(self.uuid)
        get_mock.return_value.as_dict.assert_called_once_with(short=False)

    @mock.patch.object(rules, 'delete')
    def test_delete_one(self, delete_mock):
        res = self.app.delete('/v1/rules/' + self.uuid)
        self.assertEqual(204, res.status_code)
        delete_mock.assert_called_once_with(self.uuid)


class TestApiMisc(BaseAPITest):
    @mock.patch.object(node_cache, 'get_node', autospec=True)
    def test_404_expected(self, get_mock):
        get_mock.side_effect = utils.Error('boom', code=404)
        res = self.app.get('/v1/introspection/%s' % self.uuid)
        self.assertEqual(404, res.status_code)
        self.assertEqual('boom', _get_error(res))

    def test_404_unexpected(self):
        res = self.app.get('/v42')
        self.assertEqual(404, res.status_code)
        self.assertIn('not found', _get_error(res).lower())

    @mock.patch.object(node_cache, 'get_node', autospec=True)
    def test_500_with_debug(self, get_mock):
        CONF.set_override('debug', True)
        get_mock.side_effect = RuntimeError('boom')
        res = self.app.get('/v1/introspection/%s' % self.uuid)
        self.assertEqual(500, res.status_code)
        self.assertEqual('Internal server error (RuntimeError): boom',
                         _get_error(res))

    @mock.patch.object(node_cache, 'get_node', autospec=True)
    def test_500_without_debug(self, get_mock):
        CONF.set_override('debug', False)
        get_mock.side_effect = RuntimeError('boom')
        res = self.app.get('/v1/introspection/%s' % self.uuid)
        self.assertEqual(500, res.status_code)
        self.assertEqual('Internal server error',
                         _get_error(res))


class TestApiVersions(BaseAPITest):
    def _check_version_present(self, res):
        self.assertEqual('%d.%d' % main.MINIMUM_API_VERSION,
                         res.headers.get(conf.MIN_VERSION_HEADER))
        self.assertEqual('%d.%d' % main.CURRENT_API_VERSION,
                         res.headers.get(conf.MAX_VERSION_HEADER))

    def test_root_endpoint(self):
        res = self.app.get("/")
        self.assertEqual(200, res.status_code)
        self._check_version_present(res)
        data = res.data.decode('utf-8')
        json_data = json.loads(data)
        expected = {"versions": [{
            "status": "CURRENT", "id": '%s.%s' % main.CURRENT_API_VERSION,
            "links": [{
                "rel": "self",
                "href": ("http://localhost/v%s" %
                         main.CURRENT_API_VERSION[0])
            }]
        }]}
        self.assertEqual(expected, json_data)

    @mock.patch.object(main.app.url_map, "iter_rules", autospec=True)
    def test_version_endpoint(self, mock_rules):
        mock_rules.return_value = ["/v1/endpoint1", "/v1/endpoint2/<uuid>",
                                   "/v1/endpoint1/<name>",
                                   "/v2/endpoint1", "/v1/endpoint3",
                                   "/v1/endpoint2/<uuid>/subpoint"]
        endpoint = "/v1"
        res = self.app.get(endpoint)
        self.assertEqual(200, res.status_code)
        self._check_version_present(res)
        json_data = json.loads(res.data.decode('utf-8'))
        expected = {u'resources': [
            {
                u'name': u'endpoint1',
                u'links': [{
                    u'rel': u'self',
                    u'href': u'http://localhost/v1/endpoint1'}]
            },
            {
                u'name': u'endpoint3',
                u'links': [{
                    u'rel': u'self',
                    u'href': u'http://localhost/v1/endpoint3'}]
            },
        ]}
        self.assertDictEqual(expected, json_data)

    def test_version_endpoint_invalid(self):
        endpoint = "/v-1"
        res = self.app.get(endpoint)
        self.assertEqual(404, res.status_code)

    def test_404_unexpected(self):
        # API version on unknown pages
        self._check_version_present(self.app.get('/v1/foobar'))

    @mock.patch.object(node_cache, 'get_node', autospec=True)
    def test_usual_requests(self, get_mock):
        get_mock.return_value = node_cache.NodeInfo(uuid=self.uuid,
                                                    started_at=42.0)
        # Successfull
        self._check_version_present(
            self.app.post('/v1/introspection/%s' % self.uuid))
        # With error
        self._check_version_present(
            self.app.post('/v1/introspection/foobar'))

    def test_request_correct_version(self):
        headers = {conf.VERSION_HEADER:
                   main._format_version(main.CURRENT_API_VERSION)}
        self._check_version_present(self.app.get('/', headers=headers))

    def test_request_unsupported_version(self):
        bad_version = (main.CURRENT_API_VERSION[0],
                       main.CURRENT_API_VERSION[1] + 1)
        headers = {conf.VERSION_HEADER:
                   main._format_version(bad_version)}
        res = self.app.get('/', headers=headers)
        self._check_version_present(res)
        self.assertEqual(406, res.status_code)
        error = _get_error(res)
        self.assertIn('%d.%d' % bad_version, error)
        self.assertIn('%d.%d' % main.MINIMUM_API_VERSION, error)
        self.assertIn('%d.%d' % main.CURRENT_API_VERSION, error)


class TestPlugins(unittest.TestCase):
    @mock.patch.object(example_plugin.ExampleProcessingHook,
                       'before_processing', autospec=True)
    @mock.patch.object(example_plugin.ExampleProcessingHook,
                       'before_update', autospec=True)
    def test_hook(self, mock_post, mock_pre):
        plugins_base._HOOKS_MGR = None
        CONF.set_override('processing_hooks', 'example', 'processing')
        mgr = plugins_base.processing_hooks_manager()
        mgr.map_method('before_processing', 'introspection_data')
        mock_pre.assert_called_once_with(mock.ANY, 'introspection_data')
        mgr.map_method('before_update', 'node_info', {})
        mock_post.assert_called_once_with(mock.ANY, 'node_info', {})

    def test_manager_is_cached(self):
        self.assertIs(plugins_base.processing_hooks_manager(),
                      plugins_base.processing_hooks_manager())


@mock.patch.object(firewall, 'init')
@mock.patch.object(utils, 'add_auth_middleware')
@mock.patch.object(ir_utils, 'get_client')
@mock.patch.object(db, 'init')
class TestInit(test_base.BaseTest):
    def setUp(self):
        super(TestInit, self).setUp()
        # Tests default to a synchronous executor which can't be used here
        utils._EXECUTOR = None
        self.service = main.Service()

    @mock.patch.object(firewall, 'clean_up', lambda: None)
    def tearDown(self):
        self.service.shutdown()

    def test_ok(self, mock_node_cache, mock_get_client, mock_auth,
                mock_firewall):
        CONF.set_override('auth_strategy', 'keystone')
        self.service.init()
        mock_auth.assert_called_once_with(main.app)
        mock_node_cache.assert_called_once_with()
        mock_firewall.assert_called_once_with()

    def test_init_without_authenticate(self, mock_node_cache, mock_get_client,
                                       mock_auth, mock_firewall):
        CONF.set_override('auth_strategy', 'noauth')
        self.service.init()
        self.assertFalse(mock_auth.called)

    @mock.patch.object(main.LOG, 'warning')
    def test_init_with_no_data_storage(self, mock_log, mock_node_cache,
                                       mock_get_client, mock_auth,
                                       mock_firewall):
        msg = ('Introspection data will not be stored. Change '
               '"[processing] store_data" option if this is not the '
               'desired behavior')
        self.service.init()
        mock_log.assert_called_once_with(msg)

    @mock.patch.object(main.LOG, 'info')
    def test_init_with_swift_storage(self, mock_log, mock_node_cache,
                                     mock_get_client, mock_auth,
                                     mock_firewall):
        CONF.set_override('store_data', 'swift', 'processing')
        msg = mock.call('Introspection data will be stored in Swift in the '
                        'container %s', CONF.swift.container)
        self.service.init()
        self.assertIn(msg, mock_log.call_args_list)

    def test_init_without_manage_firewall(self, mock_node_cache,
                                          mock_get_client, mock_auth,
                                          mock_firewall):
        CONF.set_override('manage_firewall', False, 'firewall')
        self.service.init()
        self.assertFalse(mock_firewall.called)

    @mock.patch.object(main.LOG, 'critical')
    def test_init_failed_processing_hook(self, mock_log, mock_node_cache,
                                         mock_get_client, mock_auth,
                                         mock_firewall):
        CONF.set_override('processing_hooks', 'foo!', 'processing')
        plugins_base._HOOKS_MGR = None

        self.assertRaises(SystemExit, self.service.init)
        mock_log.assert_called_once_with(mock.ANY, "'foo!'")


class TestCreateSSLContext(test_base.BaseTest):

    def test_use_ssl_false(self):
        CONF.set_override('use_ssl', False)
        con = main.create_ssl_context()
        self.assertIsNone(con)

    @mock.patch.object(sys, 'version_info')
    def test_old_python_returns_none(self, mock_version_info):
        mock_version_info.__lt__.return_value = True
        CONF.set_override('use_ssl', True)
        con = main.create_ssl_context()
        self.assertIsNone(con)

    @unittest.skipIf(sys.version_info[:3] < (2, 7, 9),
                     'This feature is unsupported in this version of python '
                     'so the tests will be skipped')
    @mock.patch.object(ssl, 'create_default_context', autospec=True)
    def test_use_ssl_true(self, mock_cdc):
        CONF.set_override('use_ssl', True)
        m_con = mock_cdc()
        con = main.create_ssl_context()
        self.assertEqual(m_con, con)

    @unittest.skipIf(sys.version_info[:3] < (2, 7, 9),
                     'This feature is unsupported in this version of python '
                     'so the tests will be skipped')
    @mock.patch.object(ssl, 'create_default_context', autospec=True)
    def test_only_key_path_provided(self, mock_cdc):
        CONF.set_override('use_ssl', True)
        CONF.set_override('ssl_key_path', '/some/fake/path')
        mock_context = mock_cdc()
        con = main.create_ssl_context()
        self.assertEqual(mock_context, con)
        self.assertFalse(mock_context.load_cert_chain.called)

    @unittest.skipIf(sys.version_info[:3] < (2, 7, 9),
                     'This feature is unsupported in this version of python '
                     'so the tests will be skipped')
    @mock.patch.object(ssl, 'create_default_context', autospec=True)
    def test_only_cert_path_provided(self, mock_cdc):
        CONF.set_override('use_ssl', True)
        CONF.set_override('ssl_cert_path', '/some/fake/path')
        mock_context = mock_cdc()
        con = main.create_ssl_context()
        self.assertEqual(mock_context, con)
        self.assertFalse(mock_context.load_cert_chain.called)

    @unittest.skipIf(sys.version_info[:3] < (2, 7, 9),
                     'This feature is unsupported in this version of python '
                     'so the tests will be skipped')
    @mock.patch.object(ssl, 'create_default_context', autospec=True)
    def test_both_paths_provided(self, mock_cdc):
        key_path = '/some/fake/path/key'
        cert_path = '/some/fake/path/cert'
        CONF.set_override('use_ssl', True)
        CONF.set_override('ssl_key_path', key_path)
        CONF.set_override('ssl_cert_path', cert_path)
        mock_context = mock_cdc()
        con = main.create_ssl_context()
        self.assertEqual(mock_context, con)
        mock_context.load_cert_chain.assert_called_once_with(cert_path,
                                                             key_path)

    @unittest.skipIf(sys.version_info[:3] < (2, 7, 9),
                     'This feature is unsupported in this version of python '
                     'so the tests will be skipped')
    @mock.patch.object(ssl, 'create_default_context', autospec=True)
    def test_load_cert_chain_fails(self, mock_cdc):
        CONF.set_override('use_ssl', True)
        key_path = '/some/fake/path/key'
        cert_path = '/some/fake/path/cert'
        CONF.set_override('use_ssl', True)
        CONF.set_override('ssl_key_path', key_path)
        CONF.set_override('ssl_cert_path', cert_path)
        mock_context = mock_cdc()
        mock_context.load_cert_chain.side_effect = IOError('Boom!')
        con = main.create_ssl_context()
        self.assertEqual(mock_context, con)
        mock_context.load_cert_chain.assert_called_once_with(cert_path,
                                                             key_path)
