# 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 abc
import datetime
from unittest import mock
import uuid

from keystoneauth1 import fixture
from keystoneauth1 import plugin
from oslo_utils import timeutils
import six

from keystoneclient import access
from keystoneclient.auth import base
from keystoneclient.auth import identity
from keystoneclient import exceptions
from keystoneclient import session
from keystoneclient.tests.unit import utils


@six.add_metaclass(abc.ABCMeta)
class CommonIdentityTests(object):

    TEST_ROOT_URL = 'http://127.0.0.1:5000/'
    TEST_ROOT_ADMIN_URL = 'http://127.0.0.1:35357/'

    TEST_COMPUTE_PUBLIC = 'http://nova/novapi/public'
    TEST_COMPUTE_INTERNAL = 'http://nova/novapi/internal'
    TEST_COMPUTE_ADMIN = 'http://nova/novapi/admin'

    TEST_PASS = uuid.uuid4().hex

    def setUp(self):
        super(CommonIdentityTests, self).setUp()
        self.deprecations.expect_deprecations()

        self.TEST_URL = '%s%s' % (self.TEST_ROOT_URL, self.version)
        self.TEST_ADMIN_URL = '%s%s' % (self.TEST_ROOT_ADMIN_URL, self.version)
        self.TEST_DISCOVERY = fixture.DiscoveryList(href=self.TEST_ROOT_URL)

        self.stub_auth_data()

    @abc.abstractmethod
    def create_auth_plugin(self, **kwargs):
        """Create an auth plugin that makes sense for the auth data.

        It doesn't really matter what auth mechanism is used but it should be
        appropriate to the API version.
        """
        pass

    @abc.abstractmethod
    def get_auth_data(self, **kwargs):
        """Return fake authentication data.

        This should register a valid token response and ensure that the compute
        endpoints are set to TEST_COMPUTE_PUBLIC, _INTERNAL and _ADMIN.
        """
        pass

    def stub_auth_data(self, **kwargs):
        token = self.get_auth_data(**kwargs)
        self.user_id = token.user_id

        try:
            self.project_id = token.project_id
        except AttributeError:
            self.project_id = token.tenant_id

        self.stub_auth(json=token)

    @abc.abstractproperty
    def version(self):
        """The API version being tested."""

    def test_discovering(self):
        self.stub_url('GET', [],
                      base_url=self.TEST_COMPUTE_ADMIN,
                      json=self.TEST_DISCOVERY)

        body = 'SUCCESS'

        # which gives our sample values
        self.stub_url('GET', ['path'], text=body)

        a = self.create_auth_plugin()
        s = session.Session(auth=a)

        resp = s.get('/path', endpoint_filter={'service_type': 'compute',
                                               'interface': 'admin',
                                               'version': self.version})

        self.assertEqual(200, resp.status_code)
        self.assertEqual(body, resp.text)

        new_body = 'SC SUCCESS'
        # if we don't specify a version, we use the URL from the SC
        self.stub_url('GET', ['path'],
                      base_url=self.TEST_COMPUTE_ADMIN,
                      text=new_body)

        resp = s.get('/path', endpoint_filter={'service_type': 'compute',
                                               'interface': 'admin'})

        self.assertEqual(200, resp.status_code)
        self.assertEqual(new_body, resp.text)

    def test_discovery_uses_session_cache(self):
        # register responses such that if the discovery URL is hit more than
        # once then the response will be invalid and not point to COMPUTE_ADMIN
        resps = [{'json': self.TEST_DISCOVERY}, {'status_code': 500}]
        self.requests_mock.get(self.TEST_COMPUTE_ADMIN, resps)

        body = 'SUCCESS'
        self.stub_url('GET', ['path'], text=body)

        # now either of the two plugins I use, it should not cause a second
        # request to the discovery url.
        s = session.Session()
        a = self.create_auth_plugin()
        b = self.create_auth_plugin()

        for auth in (a, b):
            resp = s.get('/path',
                         auth=auth,
                         endpoint_filter={'service_type': 'compute',
                                          'interface': 'admin',
                                          'version': self.version})

            self.assertEqual(200, resp.status_code)
            self.assertEqual(body, resp.text)

    def test_discovery_uses_plugin_cache(self):
        # register responses such that if the discovery URL is hit more than
        # once then the response will be invalid and not point to COMPUTE_ADMIN
        resps = [{'json': self.TEST_DISCOVERY}, {'status_code': 500}]
        self.requests_mock.get(self.TEST_COMPUTE_ADMIN, resps)

        body = 'SUCCESS'
        self.stub_url('GET', ['path'], text=body)

        # now either of the two sessions I use, it should not cause a second
        # request to the discovery url.
        sa = session.Session()
        sb = session.Session()
        auth = self.create_auth_plugin()

        for sess in (sa, sb):
            resp = sess.get('/path',
                            auth=auth,
                            endpoint_filter={'service_type': 'compute',
                                             'interface': 'admin',
                                             'version': self.version})

            self.assertEqual(200, resp.status_code)
            self.assertEqual(body, resp.text)

    def test_discovering_with_no_data(self):
        # which returns discovery information pointing to TEST_URL but there is
        # no data there.
        self.stub_url('GET', [],
                      base_url=self.TEST_COMPUTE_ADMIN,
                      status_code=400)

        # so the url that will be used is the same TEST_COMPUTE_ADMIN
        body = 'SUCCESS'
        self.stub_url('GET', ['path'], base_url=self.TEST_COMPUTE_ADMIN,
                      text=body, status_code=200)

        a = self.create_auth_plugin()
        s = session.Session(auth=a)

        resp = s.get('/path', endpoint_filter={'service_type': 'compute',
                                               'interface': 'admin',
                                               'version': self.version})

        self.assertEqual(200, resp.status_code)
        self.assertEqual(body, resp.text)

    def test_asking_for_auth_endpoint_ignores_checks(self):
        a = self.create_auth_plugin()
        s = session.Session(auth=a)

        auth_url = s.get_endpoint(service_type='compute',
                                  interface=plugin.AUTH_INTERFACE)

        self.assertEqual(self.TEST_URL, auth_url)

    def _create_expired_auth_plugin(self, **kwargs):
        expires = timeutils.utcnow() - datetime.timedelta(minutes=20)
        expired_token = self.get_auth_data(expires=expires)
        expired_auth_ref = access.AccessInfo.factory(body=expired_token)

        body = 'SUCCESS'
        self.stub_url('GET', ['path'],
                      base_url=self.TEST_COMPUTE_ADMIN, text=body)

        a = self.create_auth_plugin(**kwargs)
        a.auth_ref = expired_auth_ref
        return a

    def test_reauthenticate(self):
        a = self._create_expired_auth_plugin()
        expired_auth_ref = a.auth_ref
        s = session.Session(auth=a)
        self.assertIsNot(expired_auth_ref, a.get_access(s))

    def test_no_reauthenticate(self):
        a = self._create_expired_auth_plugin(reauthenticate=False)
        expired_auth_ref = a.auth_ref
        s = session.Session(auth=a)
        self.assertIs(expired_auth_ref, a.get_access(s))

    def test_invalidate(self):
        a = self.create_auth_plugin()
        s = session.Session(auth=a)

        # trigger token fetching
        s.get_auth_headers()

        self.assertTrue(a.auth_ref)
        self.assertTrue(a.invalidate())
        self.assertIsNone(a.auth_ref)
        self.assertFalse(a.invalidate())

    def test_get_auth_properties(self):
        a = self.create_auth_plugin()
        s = session.Session()

        self.assertEqual(self.user_id, a.get_user_id(s))
        self.assertEqual(self.project_id, a.get_project_id(s))


class V3(CommonIdentityTests, utils.TestCase):

    @property
    def version(self):
        return 'v3'

    def get_auth_data(self, **kwargs):
        token = fixture.V3Token(**kwargs)
        region = 'RegionOne'

        svc = token.add_service('identity')
        svc.add_standard_endpoints(admin=self.TEST_ADMIN_URL, region=region)

        svc = token.add_service('compute')
        svc.add_standard_endpoints(admin=self.TEST_COMPUTE_ADMIN,
                                   public=self.TEST_COMPUTE_PUBLIC,
                                   internal=self.TEST_COMPUTE_INTERNAL,
                                   region=region)

        return token

    def stub_auth(self, subject_token=None, **kwargs):
        if not subject_token:
            subject_token = self.TEST_TOKEN

        kwargs.setdefault('headers', {})['X-Subject-Token'] = subject_token
        self.stub_url('POST', ['auth', 'tokens'], **kwargs)

    def create_auth_plugin(self, **kwargs):
        kwargs.setdefault('auth_url', self.TEST_URL)
        kwargs.setdefault('username', self.TEST_USER)
        kwargs.setdefault('password', self.TEST_PASS)
        return identity.V3Password(**kwargs)


class V2(CommonIdentityTests, utils.TestCase):

    @property
    def version(self):
        return 'v2.0'

    def create_auth_plugin(self, **kwargs):
        kwargs.setdefault('auth_url', self.TEST_URL)
        kwargs.setdefault('username', self.TEST_USER)
        kwargs.setdefault('password', self.TEST_PASS)
        return identity.V2Password(**kwargs)

    def get_auth_data(self, **kwargs):
        token = fixture.V2Token(**kwargs)
        region = 'RegionOne'

        svc = token.add_service('identity')
        svc.add_endpoint(self.TEST_ADMIN_URL, region=region)

        svc = token.add_service('compute')
        svc.add_endpoint(public=self.TEST_COMPUTE_PUBLIC,
                         internal=self.TEST_COMPUTE_INTERNAL,
                         admin=self.TEST_COMPUTE_ADMIN,
                         region=region)

        return token

    def stub_auth(self, **kwargs):
        self.stub_url('POST', ['tokens'], **kwargs)


class CatalogHackTests(utils.TestCase):

    TEST_URL = 'http://keystone.server:5000/v2.0'
    OTHER_URL = 'http://other.server:5000/path'

    IDENTITY = 'identity'

    BASE_URL = 'http://keystone.server:5000/'
    V2_URL = BASE_URL + 'v2.0'
    V3_URL = BASE_URL + 'v3'

    def setUp(self):
        super(CatalogHackTests, self).setUp()
        self.deprecations.expect_deprecations()

    def test_getting_endpoints(self):
        disc = fixture.DiscoveryList(href=self.BASE_URL)
        self.stub_url('GET',
                      ['/'],
                      base_url=self.BASE_URL,
                      json=disc)

        token = fixture.V2Token()
        service = token.add_service(self.IDENTITY)
        service.add_endpoint(public=self.V2_URL,
                             admin=self.V2_URL,
                             internal=self.V2_URL)

        self.stub_url('POST',
                      ['tokens'],
                      base_url=self.V2_URL,
                      json=token)

        v2_auth = identity.V2Password(self.V2_URL,
                                      username=uuid.uuid4().hex,
                                      password=uuid.uuid4().hex)

        sess = session.Session(auth=v2_auth)

        endpoint = sess.get_endpoint(service_type=self.IDENTITY,
                                     interface='public',
                                     version=(3, 0))

        self.assertEqual(self.V3_URL, endpoint)

    def test_returns_original_when_discover_fails(self):
        token = fixture.V2Token()
        service = token.add_service(self.IDENTITY)
        service.add_endpoint(public=self.V2_URL,
                             admin=self.V2_URL,
                             internal=self.V2_URL)

        self.stub_url('POST',
                      ['tokens'],
                      base_url=self.V2_URL,
                      json=token)

        self.stub_url('GET', [], base_url=self.BASE_URL, status_code=404)

        v2_auth = identity.V2Password(self.V2_URL,
                                      username=uuid.uuid4().hex,
                                      password=uuid.uuid4().hex)

        sess = session.Session(auth=v2_auth)

        endpoint = sess.get_endpoint(service_type=self.IDENTITY,
                                     interface='public',
                                     version=(3, 0))

        self.assertEqual(self.V2_URL, endpoint)

    def test_getting_endpoints_on_auth_interface(self):
        disc = fixture.DiscoveryList(href=self.BASE_URL)
        self.stub_url('GET',
                      ['/'],
                      base_url=self.BASE_URL,
                      status_code=300,
                      json=disc)

        token = fixture.V2Token()
        service = token.add_service(self.IDENTITY)
        service.add_endpoint(public=self.V2_URL,
                             admin=self.V2_URL,
                             internal=self.V2_URL)

        self.stub_url('POST',
                      ['tokens'],
                      base_url=self.V2_URL,
                      json=token)

        v2_auth = identity.V2Password(self.V2_URL,
                                      username=uuid.uuid4().hex,
                                      password=uuid.uuid4().hex)

        sess = session.Session(auth=v2_auth)

        endpoint = sess.get_endpoint(interface=plugin.AUTH_INTERFACE,
                                     version=(3, 0))

        self.assertEqual(self.V3_URL, endpoint)


class GenericPlugin(base.BaseAuthPlugin):

    BAD_TOKEN = uuid.uuid4().hex

    def __init__(self):
        super(GenericPlugin, self).__init__()

        self.endpoint = 'http://keystone.host:5000'

        self.headers = {'headerA': 'valueA',
                        'headerB': 'valueB'}

        self.cert = '/path/to/cert'
        self.connection_params = {'cert': self.cert, 'verify': False}

    def url(self, prefix):
        return '%s/%s' % (self.endpoint, prefix)

    def get_token(self, session, **kwargs):
        # NOTE(jamielennox): by specifying get_headers this should not be used
        return self.BAD_TOKEN

    def get_headers(self, session, **kwargs):
        return self.headers

    def get_endpoint(self, session, **kwargs):
        return self.endpoint

    def get_connection_params(self, session, **kwargs):
        return self.connection_params


class GenericAuthPluginTests(utils.TestCase):

    # filter doesn't matter to GenericPlugin, but we have to specify one
    ENDPOINT_FILTER = {uuid.uuid4().hex: uuid.uuid4().hex}

    def setUp(self):
        super(GenericAuthPluginTests, self).setUp()
        self.auth = GenericPlugin()

        with self.deprecations.expect_deprecations_here():
            self.session = session.Session(auth=self.auth)

    def test_setting_headers(self):
        text = uuid.uuid4().hex
        self.stub_url('GET', base_url=self.auth.url('prefix'), text=text)

        resp = self.session.get('prefix', endpoint_filter=self.ENDPOINT_FILTER)

        self.assertEqual(text, resp.text)

        for k, v in self.auth.headers.items():
            self.assertRequestHeaderEqual(k, v)

        with self.deprecations.expect_deprecations_here():
            self.assertIsNone(self.session.get_token())
        self.assertEqual(self.auth.headers,
                         self.session.get_auth_headers())
        self.assertNotIn('X-Auth-Token',
                         self.requests_mock.last_request.headers)

    def test_setting_connection_params(self):
        text = uuid.uuid4().hex

        with mock.patch.object(self.session.session, 'request') as mocked:
            mocked.return_value = utils.test_response(text=text)
            resp = self.session.get('prefix',
                                    endpoint_filter=self.ENDPOINT_FILTER)

            self.assertEqual(text, resp.text)

            # the cert and verify values passed to request are those that were
            # returned from the auth plugin as connection params.

            mocked.assert_called_once_with('GET',
                                           self.auth.url('prefix'),
                                           headers=mock.ANY,
                                           allow_redirects=False,
                                           cert=self.auth.cert,
                                           verify=False)

    def test_setting_bad_connection_params(self):
        # The uuid name parameter here is unknown and not in the allowed params
        # to be returned to the session and so an error will be raised.
        name = uuid.uuid4().hex
        self.auth.connection_params[name] = uuid.uuid4().hex

        e = self.assertRaises(exceptions.UnsupportedParameters,
                              self.session.get,
                              'prefix',
                              endpoint_filter=self.ENDPOINT_FILTER)

        self.assertIn(name, str(e))
