zulip/zerver/tests/test_auth_backends.py

# -*- coding: utf-8 -*-
from django.conf import settings
from django.core import mail
from django.http import HttpResponse
from django.test import override_settings
from django_auth_ldap.backend import _LDAPUser
from django.test.client import RequestFactory
from django.utils.timezone import now as timezone_now
from typing import Any, Callable, Dict, List, Optional, Set, Tuple
from oauth2client.crypt import AppIdentityError
from django.core import signing
from django.urls import reverse

import httpretty
import os

import jwt
import mock
import re
import time
import datetime

from zerver.lib.actions import (
    do_deactivate_realm,
    do_deactivate_user,
    do_reactivate_realm,
    do_reactivate_user,
    do_set_realm_authentication_methods,
    ensure_stream,
    validate_email,
)
from zerver.lib.avatar import avatar_url
from zerver.lib.dev_ldap_directory import generate_dev_ldap_dir
from zerver.lib.mobile_auth_otp import otp_decrypt_api_key
from zerver.lib.validator import validate_login_email, \
    check_bool, check_dict_only, check_string, Validator
from zerver.lib.request import JsonableError
from zerver.lib.users import get_all_api_keys
from zerver.lib.initial_password import initial_password
from zerver.lib.sessions import get_session_dict_user
from zerver.lib.test_classes import (
    ZulipTestCase,
)
from zerver.models import \
    get_realm, email_to_username, CustomProfileField, CustomProfileFieldValue, \
    UserProfile, PreregistrationUser, Realm, get_user, MultiuseInvite
from zerver.signals import JUST_CREATED_THRESHOLD

from confirmation.models import Confirmation, create_confirmation_link

from zproject.backends import ZulipDummyBackend, EmailAuthBackend, \
    GoogleMobileOauth2Backend, ZulipRemoteUserBackend, ZulipLDAPAuthBackend, \
    ZulipLDAPUserPopulator, DevAuthBackend, GitHubAuthBackend, ZulipAuthMixin, \
    dev_auth_enabled, password_auth_enabled, github_auth_enabled, \
    require_email_format_usernames, AUTH_BACKEND_NAME_MAP, \
    ZulipLDAPConfigurationError, ZulipLDAPExceptionOutsideDomain, \
    ZulipLDAPException, sync_user_from_ldap

from zerver.views.auth import (maybe_send_to_registration,
                               _subdomain_token_salt)
from version import ZULIP_VERSION

from social_core.exceptions import AuthFailed, AuthStateForbidden
from social_django.strategy import DjangoStrategy
from social_django.storage import BaseDjangoStorage

import json
import urllib
import ujson
from zerver.lib.test_helpers import MockLDAP, load_subdomain_token

class AuthBackendTest(ZulipTestCase):
    def get_username(self, email_to_username: Optional[Callable[[str], str]]=None) -> str:
        username = self.example_email('hamlet')
        if email_to_username is not None:
            username = email_to_username(self.example_email('hamlet'))

        return username

    def verify_backend(self, backend: Any, good_kwargs: Optional[Dict[str, Any]]=None, bad_kwargs: Optional[Dict[str, Any]]=None) -> None:

        user_profile = self.example_user('hamlet')

        assert good_kwargs is not None

        # If bad_kwargs was specified, verify auth fails in that case
        if bad_kwargs is not None:
            self.assertIsNone(backend.authenticate(**bad_kwargs))

        # Verify auth works
        result = backend.authenticate(**good_kwargs)
        self.assertEqual(user_profile, result)

        # Verify auth fails with a deactivated user
        do_deactivate_user(user_profile)
        self.assertIsNone(backend.authenticate(**good_kwargs))

        # Reactivate the user and verify auth works again
        do_reactivate_user(user_profile)
        result = backend.authenticate(**good_kwargs)
        self.assertEqual(user_profile, result)

        # Verify auth fails with a deactivated realm
        do_deactivate_realm(user_profile.realm)
        self.assertIsNone(backend.authenticate(**good_kwargs))

        # Verify auth works again after reactivating the realm
        do_reactivate_realm(user_profile.realm)
        result = backend.authenticate(**good_kwargs)
        self.assertEqual(user_profile, result)

        # ZulipDummyBackend isn't a real backend so the remainder
        # doesn't make sense for it
        if isinstance(backend, ZulipDummyBackend):
            return

        # Verify auth fails if the auth backend is disabled on server
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipDummyBackend',)):
            self.assertIsNone(backend.authenticate(**good_kwargs))

        # Verify auth fails if the auth backend is disabled for the realm
        for backend_name in AUTH_BACKEND_NAME_MAP.keys():
            if isinstance(backend, AUTH_BACKEND_NAME_MAP[backend_name]):
                break

        index = getattr(user_profile.realm.authentication_methods, backend_name).number
        user_profile.realm.authentication_methods.set_bit(index, False)
        user_profile.realm.save()
        if 'realm' in good_kwargs:
            # Because this test is a little unfaithful to the ordering
            # (i.e. we fetched the realm object before this function
            # was called, when in fact it should be fetched after we
            # changed the allowed authentication methods), we need to
            # propagate the changes we just made to the actual realm
            # object in good_kwargs.
            good_kwargs['realm'] = user_profile.realm
        self.assertIsNone(backend.authenticate(**good_kwargs))
        user_profile.realm.authentication_methods.set_bit(index, True)
        user_profile.realm.save()

    def test_dummy_backend(self) -> None:
        realm = get_realm("zulip")
        username = self.get_username()
        self.verify_backend(ZulipDummyBackend(),
                            good_kwargs=dict(username=username,
                                             realm=realm,
                                             use_dummy_backend=True),
                            bad_kwargs=dict(username=username,
                                            realm=realm,
                                            use_dummy_backend=False))

    def setup_subdomain(self, user_profile: UserProfile) -> None:
        realm = user_profile.realm
        realm.string_id = 'zulip'
        realm.save()

    def test_email_auth_backend(self) -> None:
        username = self.get_username()
        user_profile = self.example_user('hamlet')
        password = "testpassword"
        user_profile.set_password(password)
        user_profile.save()

        with mock.patch('zproject.backends.email_auth_enabled',
                        return_value=False), \
                mock.patch('zproject.backends.password_auth_enabled',
                           return_value=True):
            return_data = {}  # type: Dict[str, bool]
            user = EmailAuthBackend().authenticate(self.example_email('hamlet'),
                                                   realm=get_realm("zulip"),
                                                   password=password,
                                                   return_data=return_data)
            self.assertEqual(user, None)
            self.assertTrue(return_data['email_auth_disabled'])

        self.verify_backend(EmailAuthBackend(),
                            good_kwargs=dict(password=password,
                                             username=username,
                                             realm=get_realm('zulip'),
                                             return_data=dict()),
                            bad_kwargs=dict(password=password,
                                            username=username,
                                            realm=get_realm('zephyr'),
                                            return_data=dict()))
        self.verify_backend(EmailAuthBackend(),
                            good_kwargs=dict(password=password,
                                             username=username,
                                             realm=get_realm('zulip'),
                                             return_data=dict()),
                            bad_kwargs=dict(password=password,
                                            username=username,
                                            realm=None,
                                            return_data=dict()))

    def test_email_auth_backend_disabled_password_auth(self) -> None:
        user_profile = self.example_user('hamlet')
        password = "testpassword"
        user_profile.set_password(password)
        user_profile.save()
        # Verify if a realm has password auth disabled, correct password is rejected
        with mock.patch('zproject.backends.password_auth_enabled', return_value=False):
            self.assertIsNone(EmailAuthBackend().authenticate(self.example_email('hamlet'),
                                                              password,
                                                              realm=get_realm("zulip")))

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipDummyBackend',))
    def test_no_backend_enabled(self) -> None:
        result = self.client_get('/login/')
        self.assert_in_success_response(["No authentication backends are enabled"], result)

        result = self.client_get('/register/')
        self.assert_in_success_response(["No authentication backends are enabled"], result)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.GoogleMobileOauth2Backend',))
    def test_any_backend_enabled(self) -> None:

        # testing to avoid false error messages.
        result = self.client_get('/login/')
        self.assert_not_in_success_response(["No authentication backends are enabled"], result)

        result = self.client_get('/register/')
        self.assert_not_in_success_response(["No authentication backends are enabled"], result)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.GoogleMobileOauth2Backend',))
    def test_google_backend(self) -> None:
        user_profile = self.example_user('hamlet')
        email = user_profile.email
        backend = GoogleMobileOauth2Backend()
        payload = dict(email_verified=True,
                       email=email)

        with mock.patch('apiclient.sample_tools.client.verify_id_token', return_value=payload):
            self.verify_backend(backend,
                                good_kwargs=dict(realm=get_realm("zulip")),
                                bad_kwargs=dict(realm=get_realm('invalid')))

        # Verify valid_attestation parameter is set correctly
        unverified_payload = dict(email_verified=False)
        with mock.patch('apiclient.sample_tools.client.verify_id_token',
                        return_value=unverified_payload):
            ret = dict()  # type: Dict[str, str]
            result = backend.authenticate(realm=get_realm("zulip"), return_data=ret)
            self.assertIsNone(result)
            self.assertFalse(ret["valid_attestation"])

        nonexistent_user_payload = dict(email_verified=True, email="invalid@zulip.com")
        with mock.patch('apiclient.sample_tools.client.verify_id_token',
                        return_value=nonexistent_user_payload):
            ret = dict()
            result = backend.authenticate(realm=get_realm("zulip"), return_data=ret)
            self.assertIsNone(result)
            self.assertTrue(ret["valid_attestation"])
        with mock.patch('apiclient.sample_tools.client.verify_id_token',
                        side_effect=AppIdentityError):
            ret = dict()
            result = backend.authenticate(realm=get_realm("zulip"), return_data=ret)
            self.assertIsNone(result)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_ldap_backend(self) -> None:
        user_profile = self.example_user('hamlet')
        email = user_profile.email
        password = "test_password"
        self.setup_subdomain(user_profile)

        username = self.get_username()
        backend = ZulipLDAPAuthBackend()

        # Test LDAP auth fails when LDAP server rejects password
        with mock.patch('django_auth_ldap.backend._LDAPUser._authenticate_user_dn',
                        side_effect=_LDAPUser.AuthenticationFailed("Failed")), (
            mock.patch('django_auth_ldap.backend._LDAPUser._check_requirements')), (
            mock.patch('django_auth_ldap.backend._LDAPUser.attrs',
                       return_value=dict(full_name=['Hamlet']))):
            self.assertIsNone(backend.authenticate(email, password, realm=get_realm("zulip")))

        with mock.patch('django_auth_ldap.backend._LDAPUser._authenticate_user_dn'), (
            mock.patch('django_auth_ldap.backend._LDAPUser._check_requirements')), (
            mock.patch('django_auth_ldap.backend._LDAPUser.attrs',
                       return_value=dict(full_name=['Hamlet']))):
            self.verify_backend(backend,
                                bad_kwargs=dict(username=username,
                                                password=password,
                                                realm=get_realm('zephyr')),
                                good_kwargs=dict(username=username,
                                                 password=password,
                                                 realm=get_realm('zulip')))
            self.verify_backend(backend,
                                bad_kwargs=dict(username=username,
                                                password=password,
                                                realm=get_realm('acme')),
                                good_kwargs=dict(username=username,
                                                 password=password,
                                                 realm=get_realm('zulip')))

    def test_devauth_backend(self) -> None:
        self.verify_backend(DevAuthBackend(),
                            good_kwargs=dict(dev_auth_username=self.get_username(),
                                             realm=get_realm("zulip")),
                            bad_kwargs=dict(dev_auth_username=self.get_username(),
                                            realm=get_realm("invalid")))

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',))
    def test_remote_user_backend(self) -> None:
        username = self.get_username()
        self.verify_backend(ZulipRemoteUserBackend(),
                            good_kwargs=dict(remote_user=username,
                                             realm=get_realm('zulip')),
                            bad_kwargs=dict(remote_user=username,
                                            realm=get_realm('zephyr')))

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',))
    def test_remote_user_backend_invalid_realm(self) -> None:
        username = self.get_username()
        self.verify_backend(ZulipRemoteUserBackend(),
                            good_kwargs=dict(remote_user=username,
                                             realm=get_realm('zulip')),
                            bad_kwargs=dict(remote_user=username,
                                            realm=None))

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',))
    @override_settings(SSO_APPEND_DOMAIN='zulip.com')
    def test_remote_user_backend_sso_append_domain(self) -> None:
        username = self.get_username(email_to_username)
        self.verify_backend(ZulipRemoteUserBackend(),
                            good_kwargs=dict(remote_user=username,
                                             realm=get_realm("zulip")),
                            bad_kwargs=dict(remote_user=username,
                                            realm=get_realm('zephyr')))

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.GitHubAuthBackend',))
    def test_github_backend(self) -> None:
        user = self.example_user('hamlet')
        token_data_dict = {
            'access_token': 'foobar',
            'token_type': 'bearer'
        }
        account_data_dict = dict(email=user.email, name=user.full_name)
        email_data = [
            dict(email=account_data_dict["email"],
                 verified=True,
                 primary=True),
            dict(email="nonprimary@example.com",
                 verified=True),
            dict(email="ignored@example.com",
                 verified=False),
        ]
        httpretty.enable()
        httpretty.register_uri(
            httpretty.POST,
            "https://github.com/login/oauth/access_token",
            match_querystring=False,
            status=200,
            body=json.dumps(token_data_dict))
        httpretty.register_uri(
            httpretty.GET,
            "https://api.github.com/user",
            status=200,
            body=json.dumps(account_data_dict)
        )
        httpretty.register_uri(
            httpretty.GET,
            "https://api.github.com/user/emails",
            status=200,
            body=json.dumps(email_data)
        )

        backend = GitHubAuthBackend()
        backend.strategy = DjangoStrategy(storage=BaseDjangoStorage())
        orig_authenticate = GitHubAuthBackend.authenticate

        def patched_authenticate(*args: Any, **kwargs: Any) -> Any:
            if 'subdomain' in kwargs:
                backend.strategy.session_set("subdomain", kwargs["subdomain"])
                del kwargs['subdomain']
            result = orig_authenticate(backend, *args, **kwargs)
            return result
        backend.authenticate = patched_authenticate
        good_kwargs = dict(backend=backend, strategy=backend.strategy,
                           storage=backend.strategy.storage,
                           response=token_data_dict,
                           subdomain='zulip')
        bad_kwargs = dict(subdomain='acme')
        with mock.patch('zerver.views.auth.redirect_and_log_into_subdomain',
                        return_value=user):
            self.verify_backend(backend,
                                good_kwargs=good_kwargs,
                                bad_kwargs=bad_kwargs)
            bad_kwargs['subdomain'] = "zephyr"
            self.verify_backend(backend,
                                good_kwargs=good_kwargs,
                                bad_kwargs=bad_kwargs)
        backend.authenticate = orig_authenticate
        httpretty.disable()

class ResponseMock:
    def __init__(self, status_code: int, data: Any) -> None:
        self.status_code = status_code
        self.data = data

    def json(self) -> str:
        return self.data

    @property
    def text(self) -> str:
        return "Response text"

class SocialAuthBase(ZulipTestCase):
    """This is a base class for testing social-auth backends. Following
    methods can be overrided by subclasses as per the backend:

        registerExtraEndpoints() - If the backend being tested calls some extra
                                   endpoints then they can be added here.

        get_account_data_dict() - Return the data returned by the user info endpoint
                                  according to the respective backend.
    """
    # Don't run base class tests, make sure to set it to False
    # in subclass otherwise its tests will not run.
    __unittest_skip__ = True

    def setUp(self) -> None:
        self.user_profile = self.example_user('hamlet')
        self.email = self.user_profile.email
        self.name = 'Hamlet'
        self.backend = self.BACKEND_CLASS
        self.backend.strategy = DjangoStrategy(storage=BaseDjangoStorage())
        self.user_profile.backend = self.backend

        # This is a workaround for the fact that Python social auth
        # caches the set of authentication backends that are enabled
        # the first time that `social_django.utils` is imported.  See
        # https://github.com/python-social-auth/social-app-django/pull/162
        # for details.
        from social_core.backends.utils import load_backends
        load_backends(settings.AUTHENTICATION_BACKENDS, force_load=True)

    def social_auth_test(self, account_data_dict: Dict[str, str],
                         *, subdomain: Optional[str]=None,
                         mobile_flow_otp: Optional[str]=None,
                         is_signup: Optional[str]=None,
                         next: str='',
                         **extra_data: Any) -> HttpResponse:
        url = self.LOGIN_URL
        params = {}
        headers = {}
        if subdomain is not None:
            headers['HTTP_HOST'] = subdomain + ".testserver"
        if mobile_flow_otp is not None:
            params['mobile_flow_otp'] = mobile_flow_otp
            headers['HTTP_USER_AGENT'] = "ZulipAndroid"
        if is_signup is not None:
            url = self.SIGNUP_URL
        params['next'] = next
        if len(params) > 0:
            url += "?%s" % (urllib.parse.urlencode(params))

        result = self.client_get(url, **headers)

        expected_result_url_prefix = 'http://testserver/login/%s/' % (self.backend.name,)
        if settings.SOCIAL_AUTH_SUBDOMAIN is not None:
            expected_result_url_prefix = ('http://%s.testserver/login/%s/' %
                                          (settings.SOCIAL_AUTH_SUBDOMAIN, self.backend.name,))

        if result.status_code != 302 or not result.url.startswith(expected_result_url_prefix):
            return result

        result = self.client_get(result.url, **headers)
        self.assertEqual(result.status_code, 302)
        assert self.AUTHORIZATION_URL in result.url

        self.client.cookies = result.cookies

        # Next, the browser requests result["Location"], and gets
        # redirected back to the registered redirect uri.

        token_data_dict = {
            'access_token': 'foobar',
            'token_type': 'bearer'
        }

        # We register callbacks for the key URLs on Identity Provider that
        # auth completion url will call
        httpretty.enable()
        httpretty.register_uri(
            httpretty.POST,
            self.ACCESS_TOKEN_URL,
            match_querystring=False,
            status=200,
            body=json.dumps(token_data_dict))
        httpretty.register_uri(
            httpretty.GET,
            self.USER_INFO_URL,
            status=200,
            body=json.dumps(account_data_dict)
        )
        self.registerExtraEndpoints(account_data_dict, **extra_data)

        parsed_url = urllib.parse.urlparse(result.url)
        csrf_state = urllib.parse.parse_qs(parsed_url.query)['state']
        result = self.client_get(self.AUTH_FINISH_URL,
                                 dict(state=csrf_state), **headers)
        httpretty.disable()
        return result

    def test_social_auth_no_key(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        with self.settings(**{self.CLIENT_KEY_SETTING: None}):
            result = self.social_auth_test(account_data_dict,
                                           subdomain='zulip', next='/user_uploads/image')
            self.assertEqual(result.status_code, 302)
            self.assertEqual(result.url, self.CONFIG_ERROR_URL)

    def test_social_auth_success(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        result = self.social_auth_test(account_data_dict,
                                       subdomain='zulip', next='/user_uploads/image')
        data = load_subdomain_token(result)
        self.assertEqual(data['email'], self.example_email("hamlet"))
        self.assertEqual(data['name'], 'Hamlet')
        self.assertEqual(data['subdomain'], 'zulip')
        self.assertEqual(data['next'], '/user_uploads/image')
        self.assertEqual(result.status_code, 302)
        parsed_url = urllib.parse.urlparse(result.url)
        uri = "{}://{}{}".format(parsed_url.scheme, parsed_url.netloc,
                                 parsed_url.path)
        self.assertTrue(uri.startswith('http://zulip.testserver/accounts/login/subdomain/'))

    @override_settings(SOCIAL_AUTH_SUBDOMAIN=None)
    def test_when_social_auth_subdomain_is_not_set(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        result = self.social_auth_test(account_data_dict,
                                       subdomain='zulip',
                                       next='/user_uploads/image')
        data = load_subdomain_token(result)
        self.assertEqual(data['email'], self.example_email("hamlet"))
        self.assertEqual(data['name'], 'Hamlet')
        self.assertEqual(data['subdomain'], 'zulip')
        self.assertEqual(data['next'], '/user_uploads/image')
        self.assertEqual(result.status_code, 302)
        parsed_url = urllib.parse.urlparse(result.url)
        uri = "{}://{}{}".format(parsed_url.scheme, parsed_url.netloc,
                                 parsed_url.path)
        self.assertTrue(uri.startswith('http://zulip.testserver/accounts/login/subdomain/'))

    def test_social_auth_deactivated_user(self) -> None:
        user_profile = self.example_user("hamlet")
        do_deactivate_user(user_profile)
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        result = self.social_auth_test(account_data_dict,
                                       subdomain='zulip')
        self.assertEqual(result.status_code, 302)
        self.assertEqual(result.url, "/login/")
        # TODO: verify whether we provide a clear error message

    def test_social_auth_invalid_realm(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        with mock.patch('zerver.middleware.get_realm', return_value=get_realm("zulip")):
            # This mock.patch case somewhat hackishly arranges it so
            # that we switch realms halfway through the test
            result = self.social_auth_test(account_data_dict,
                                           subdomain='invalid', next='/user_uploads/image')
        self.assertEqual(result.status_code, 302)
        self.assertEqual(result.url, "/accounts/login/?subdomain=1")

    def test_social_auth_invalid_email(self) -> None:
        account_data_dict = self.get_account_data_dict(email="invalid", name=self.name)
        result = self.social_auth_test(account_data_dict,
                                       subdomain='zulip', next='/user_uploads/image')
        self.assertEqual(result.status_code, 302)
        self.assertEqual(result.url, "/login/?next=/user_uploads/image")

    def test_user_cannot_log_into_nonexisting_realm(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        result = self.social_auth_test(account_data_dict,
                                       subdomain='nonexistent')
        self.assert_in_success_response(["There is no Zulip organization hosted at this subdomain."],
                                        result)

    def test_user_cannot_log_into_wrong_subdomain(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        result = self.social_auth_test(account_data_dict,
                                       subdomain='zephyr')
        self.assertTrue(result.url.startswith("http://zephyr.testserver/accounts/login/subdomain/"))
        result = self.client_get(result.url.replace('http://zephyr.testserver', ''),
                                 subdomain="zephyr")
        self.assert_in_success_response(['Your email address, hamlet@zulip.com, is not in one of the domains ',
                                         'that are allowed to register for accounts in this organization.'], result)

    def test_social_auth_mobile_success(self) -> None:
        mobile_flow_otp = '1234abcd' * 8
        account_data_dict = self.get_account_data_dict(email=self.email, name='Full Name')
        self.assertEqual(len(mail.outbox), 0)
        self.user_profile.date_joined = timezone_now() - datetime.timedelta(seconds=JUST_CREATED_THRESHOLD + 1)
        self.user_profile.save()

        with self.settings(SEND_LOGIN_EMAILS=True):
            # Verify that the right thing happens with an invalid-format OTP
            result = self.social_auth_test(account_data_dict, subdomain='zulip',
                                           mobile_flow_otp="1234")
            self.assert_json_error(result, "Invalid OTP")
            result = self.social_auth_test(account_data_dict, subdomain='zulip',
                                           mobile_flow_otp="invalido" * 8)
            self.assert_json_error(result, "Invalid OTP")

            # Now do it correctly
            result = self.social_auth_test(account_data_dict, subdomain='zulip',
                                           mobile_flow_otp=mobile_flow_otp)
        self.assertEqual(result.status_code, 302)
        redirect_url = result['Location']
        parsed_url = urllib.parse.urlparse(redirect_url)
        query_params = urllib.parse.parse_qs(parsed_url.query)
        self.assertEqual(parsed_url.scheme, 'zulip')
        self.assertEqual(query_params["realm"], ['http://zulip.testserver'])
        self.assertEqual(query_params["email"], [self.example_email("hamlet")])
        encrypted_api_key = query_params["otp_encrypted_api_key"][0]
        hamlet_api_keys = get_all_api_keys(self.example_user('hamlet'))
        self.assertIn(otp_decrypt_api_key(encrypted_api_key, mobile_flow_otp), hamlet_api_keys)
        self.assertEqual(len(mail.outbox), 1)
        self.assertIn('Zulip on Android', mail.outbox[0].body)

    def test_social_auth_registration_existing_account(self) -> None:
        """If the user already exists, signup flow just logs them in"""
        email = "hamlet@zulip.com"
        name = 'Full Name'
        account_data_dict = self.get_account_data_dict(email=email, name=name)
        result = self.social_auth_test(account_data_dict,
                                       subdomain='zulip', is_signup='1')
        data = load_subdomain_token(result)
        self.assertEqual(data['email'], self.example_email("hamlet"))
        self.assertEqual(data['name'], 'Full Name')
        self.assertEqual(data['subdomain'], 'zulip')
        self.assertEqual(result.status_code, 302)
        parsed_url = urllib.parse.urlparse(result.url)
        uri = "{}://{}{}".format(parsed_url.scheme, parsed_url.netloc,
                                 parsed_url.path)
        self.assertTrue(uri.startswith('http://zulip.testserver/accounts/login/subdomain/'))
        hamlet = self.example_user("hamlet")
        # Name wasn't changed at all
        self.assertEqual(hamlet.full_name, "King Hamlet")

    def test_social_auth_registration(self) -> None:
        """If the user doesn't exist yet, social auth can be used to register an account"""
        email = "newuser@zulip.com"
        name = 'Full Name'
        realm = get_realm("zulip")
        account_data_dict = self.get_account_data_dict(email=email, name=name)
        result = self.social_auth_test(account_data_dict,
                                       subdomain='zulip', is_signup='1')

        data = load_subdomain_token(result)
        self.assertEqual(data['email'], email)
        self.assertEqual(data['name'], name)
        self.assertEqual(data['subdomain'], 'zulip')
        self.assertEqual(result.status_code, 302)
        parsed_url = urllib.parse.urlparse(result.url)
        uri = "{}://{}{}".format(parsed_url.scheme, parsed_url.netloc,
                                 parsed_url.path)
        self.assertTrue(uri.startswith('http://zulip.testserver/accounts/login/subdomain/'))

        result = self.client_get(result.url)

        self.assertEqual(result.status_code, 302)
        confirmation = Confirmation.objects.all().first()
        confirmation_key = confirmation.confirmation_key
        self.assertIn('do_confirm/' + confirmation_key, result.url)
        result = self.client_get(result.url)
        self.assert_in_response('action="/accounts/register/"', result)
        data = {"from_confirmation": "1",
                "full_name": name,
                "key": confirmation_key}
        result = self.client_post('/accounts/register/', data)
        self.assert_in_response("We just need you to do one last thing", result)

        # Verify that the user is asked for name but not password
        self.assert_not_in_success_response(['id_password'], result)
        self.assert_in_success_response(['id_full_name'], result)

        # Click confirm registration button.
        result = self.client_post(
            '/accounts/register/',
            {'full_name': name,
             'key': confirmation_key,
             'terms': True})

        self.assertEqual(result.status_code, 302)
        user_profile = get_user(email, realm)
        self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)

    def test_social_auth_registration_without_is_signup(self) -> None:
        """If `is_signup` is not set then a new account isn't created"""
        email = "newuser@zulip.com"
        name = 'Full Name'
        account_data_dict = self.get_account_data_dict(email=email, name=name)
        result = self.social_auth_test(account_data_dict,
                                       subdomain='zulip')
        self.assertEqual(result.status_code, 302)
        data = load_subdomain_token(result)
        self.assertEqual(data['email'], email)
        self.assertEqual(data['name'], name)
        self.assertEqual(data['subdomain'], 'zulip')
        self.assertEqual(result.status_code, 302)
        parsed_url = urllib.parse.urlparse(result.url)
        uri = "{}://{}{}".format(parsed_url.scheme, parsed_url.netloc,
                                 parsed_url.path)
        self.assertTrue(uri.startswith('http://zulip.testserver/accounts/login/subdomain/'))

        result = self.client_get(result.url)
        self.assertEqual(result.status_code, 200)
        self.assert_in_response("No account found for newuser@zulip.com.", result)

    def test_social_auth_registration_without_is_signup_closed_realm(self) -> None:
        """If the user doesn't exist yet in closed realm, give an error"""
        email = "nonexisting@phantom.com"
        name = 'Full Name'
        account_data_dict = self.get_account_data_dict(email=email, name=name)
        result = self.social_auth_test(account_data_dict,
                                       subdomain='zulip')
        self.assertEqual(result.status_code, 302)
        data = load_subdomain_token(result)
        self.assertEqual(data['email'], email)
        self.assertEqual(data['name'], name)
        self.assertEqual(data['subdomain'], 'zulip')
        self.assertEqual(result.status_code, 302)
        parsed_url = urllib.parse.urlparse(result.url)
        uri = "{}://{}{}".format(parsed_url.scheme, parsed_url.netloc,
                                 parsed_url.path)
        self.assertTrue(uri.startswith('http://zulip.testserver/accounts/login/subdomain/'))

        result = self.client_get(result.url)
        self.assertEqual(result.status_code, 200)
        self.assert_in_response('action="/register/"', result)
        self.assert_in_response('Your email address, {}, is not '
                                'in one of the domains that are allowed to register '
                                'for accounts in this organization.'.format(email), result)

    def test_social_auth_complete(self) -> None:
        with mock.patch('social_core.backends.oauth.BaseOAuth2.process_error',
                        side_effect=AuthFailed('Not found')):
            result = self.client_get(reverse('social:complete', args=[self.backend.name]))
            self.assertEqual(result.status_code, 302)
            self.assertIn('login', result.url)

    def test_social_auth_complete_when_base_exc_is_raised(self) -> None:
        with mock.patch('social_core.backends.oauth.BaseOAuth2.auth_complete',
                        side_effect=AuthStateForbidden('State forbidden')), \
                mock.patch('zproject.backends.logging.warning'):
            result = self.client_get(reverse('social:complete', args=[self.backend.name]))
            self.assertEqual(result.status_code, 302)
            self.assertIn('login', result.url)

class GitHubAuthBackendTest(SocialAuthBase):
    __unittest_skip__ = False

    BACKEND_CLASS = GitHubAuthBackend
    CLIENT_KEY_SETTING = "SOCIAL_AUTH_GITHUB_KEY"
    LOGIN_URL = "/accounts/login/social/github"
    SIGNUP_URL = "/accounts/register/social/github"
    AUTHORIZATION_URL = "https://github.com/login/oauth/authorize"
    ACCESS_TOKEN_URL = "https://github.com/login/oauth/access_token"
    USER_INFO_URL = "https://api.github.com/user"
    AUTH_FINISH_URL = "/complete/github/"
    CONFIG_ERROR_URL = "/config-error/github"

    def registerExtraEndpoints(self,
                               account_data_dict: Dict[str, str],
                               **extra_data: Any) -> None:
        # Keeping a verified email before the primary email makes sure
        # get_verified_emails puts the primary email at the start of the
        # email list returned as social_associate_user_helper assumes the
        # first email as the primary email.
        email_data = [
            dict(email="notprimary@example.com",
                 verified=True),
            dict(email=account_data_dict["email"],
                 verified=True,
                 primary=True),
            dict(email="ignored@example.com",
                 verified=False),
        ]
        email_data = extra_data.get("email_data", email_data)

        httpretty.register_uri(
            httpretty.GET,
            "https://api.github.com/user/emails",
            status=200,
            body=json.dumps(email_data)
        )

    def get_account_data_dict(self, email: str, name: str) -> Dict[str, Any]:
        return dict(email=email, name=name)

    def test_social_auth_email_not_verified(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        email_data = [
            dict(email=account_data_dict["email"],
                 verified=False,
                 primary=True),
        ]
        with mock.patch('logging.warning') as mock_warning:
            result = self.social_auth_test(account_data_dict,
                                           subdomain='zulip',
                                           email_data=email_data)
            self.assertEqual(result.status_code, 302)
            self.assertEqual(result.url, "/login/")
            mock_warning.assert_called_once_with("Social auth (GitHub) failed "
                                                 "because user has no verified emails")

    @override_settings(SOCIAL_AUTH_GITHUB_TEAM_ID='zulip-webapp')
    def test_social_auth_github_team_not_member_failed(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        with mock.patch('social_core.backends.github.GithubTeamOAuth2.user_data',
                        side_effect=AuthFailed('Not found')), \
                mock.patch('logging.info') as mock_info:
            result = self.social_auth_test(account_data_dict,
                                           subdomain='zulip')
            self.assertEqual(result.status_code, 302)
            self.assertEqual(result.url, "/login/")
            mock_info.assert_called_once_with("GitHub user is not member of required team")

    @override_settings(SOCIAL_AUTH_GITHUB_TEAM_ID='zulip-webapp')
    def test_social_auth_github_team_member_success(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        with mock.patch('social_core.backends.github.GithubTeamOAuth2.user_data',
                        return_value=account_data_dict):
            result = self.social_auth_test(account_data_dict,
                                           subdomain='zulip')
        data = load_subdomain_token(result)
        self.assertEqual(data['email'], self.example_email("hamlet"))
        self.assertEqual(data['name'], 'Hamlet')
        self.assertEqual(data['subdomain'], 'zulip')

    @override_settings(SOCIAL_AUTH_GITHUB_ORG_NAME='Zulip')
    def test_social_auth_github_organization_not_member_failed(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        with mock.patch('social_core.backends.github.GithubOrganizationOAuth2.user_data',
                        side_effect=AuthFailed('Not found')), \
                mock.patch('logging.info') as mock_info:
            result = self.social_auth_test(account_data_dict,
                                           subdomain='zulip')
            self.assertEqual(result.status_code, 302)
            self.assertEqual(result.url, "/login/")
            mock_info.assert_called_once_with("GitHub user is not member of required organization")

    @override_settings(SOCIAL_AUTH_GITHUB_ORG_NAME='Zulip')
    def test_social_auth_github_organization_member_success(self) -> None:
        account_data_dict = self.get_account_data_dict(email=self.email, name=self.name)
        with mock.patch('social_core.backends.github.GithubOrganizationOAuth2.user_data',
                        return_value=account_data_dict):
            result = self.social_auth_test(account_data_dict,
                                           subdomain='zulip')
        data = load_subdomain_token(result)
        self.assertEqual(data['email'], self.example_email("hamlet"))
        self.assertEqual(data['name'], 'Hamlet')
        self.assertEqual(data['subdomain'], 'zulip')

    def test_github_auth_enabled(self) -> None:
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.GitHubAuthBackend',)):
            self.assertTrue(github_auth_enabled())

class GoogleOAuthTest(ZulipTestCase):
    def google_oauth2_test(self, token_response: ResponseMock, account_response: ResponseMock,
                           *, subdomain: Optional[str]=None,
                           mobile_flow_otp: Optional[str]=None,
                           is_signup: Optional[str]=None,
                           next: str='') -> HttpResponse:
        url = "/accounts/login/google/"
        params = {}
        headers = {}
        if subdomain is not None:
            headers['HTTP_HOST'] = subdomain + ".testserver"
        if mobile_flow_otp is not None:
            params['mobile_flow_otp'] = mobile_flow_otp
            headers['HTTP_USER_AGENT'] = "ZulipAndroid"
        if is_signup is not None:
            params['is_signup'] = is_signup
        params['next'] = next
        if len(params) > 0:
            url += "?%s" % (urllib.parse.urlencode(params))

        result = self.client_get(url, **headers)
        if result.status_code != 302 or '/accounts/login/google/send/' not in result.url:
            return result

        # Now do the /google/send/ request
        result = self.client_get(result.url, **headers)
        self.assertEqual(result.status_code, 302)
        if 'google' not in result.url:
            return result

        self.client.cookies = result.cookies
        # Now extract the CSRF token from the redirect URL
        parsed_url = urllib.parse.urlparse(result.url)
        csrf_state = urllib.parse.parse_qs(parsed_url.query)['state']

        with mock.patch("requests.post", return_value=token_response), (
                mock.patch("requests.get", return_value=account_response)):
            result = self.client_get("/accounts/login/google/done/",
                                     dict(state=csrf_state), **headers)
        return result

class GoogleSubdomainLoginTest(GoogleOAuthTest):
    def test_google_oauth2_start(self) -> None:
        result = self.client_get('/accounts/login/google/', subdomain="zulip")
        self.assertEqual(result.status_code, 302)
        parsed_url = urllib.parse.urlparse(result.url)
        subdomain = urllib.parse.parse_qs(parsed_url.query)['subdomain']
        self.assertEqual(subdomain, ['zulip'])

    def test_google_oauth2_success(self) -> None:
        token_response = ResponseMock(200, {'access_token': "unique_token"})
        account_data = dict(name="Full Name",
                            email_verified=True,
                            email=self.example_email("hamlet"))
        account_response = ResponseMock(200, account_data)
        result = self.google_oauth2_test(token_response, account_response,
                                         subdomain='zulip', next='/user_uploads/image')

        data = load_subdomain_token(result)
        self.assertEqual(data['email'], self.example_email("hamlet"))
        self.assertEqual(data['name'], 'Full Name')
        self.assertEqual(data['subdomain'], 'zulip')
        self.assertEqual(data['next'], '/user_uploads/image')
        self.assertEqual(result.status_code, 302)
        parsed_url = urllib.parse.urlparse(result.url)
        uri = "{}://{}{}".format(parsed_url.scheme, parsed_url.netloc,
                                 parsed_url.path)
        self.assertTrue(uri.startswith('http://zulip.testserver/accounts/login/subdomain/'))

    def test_user_cannot_log_without_verified_email(self) -> None:
        token_response = ResponseMock(200, {'access_token': "unique_token"})
        account_data = dict(name="Full Name",
                            email_verified=False,
                            email=self.example_email("hamlet"))
        account_response = ResponseMock(200, account_data)
        result = self.google_oauth2_test(token_response, account_response,
                                         subdomain='zulip')
        self.assertEqual(result.status_code, 400)

    def test_google_oauth2_mobile_success(self) -> None:
        self.user_profile = self.example_user('hamlet')
        self.user_profile.date_joined = timezone_now() - datetime.timedelta(seconds=JUST_CREATED_THRESHOLD + 1)
        self.user_profile.save()
        mobile_flow_otp = '1234abcd' * 8
        token_response = ResponseMock(200, {'access_token': "unique_token"})
        account_data = dict(name="Full Name",
                            email_verified=True,
                            email=self.user_profile.email)
        account_response = ResponseMock(200, account_data)
        self.assertEqual(len(mail.outbox), 0)

        with self.settings(SEND_LOGIN_EMAILS=True):
            # Verify that the right thing happens with an invalid-format OTP
            result = self.google_oauth2_test(token_response, account_response, subdomain='zulip',
                                             mobile_flow_otp="1234")
            self.assert_json_error(result, "Invalid OTP")
            result = self.google_oauth2_test(token_response, account_response, subdomain='zulip',
                                             mobile_flow_otp="invalido" * 8)
            self.assert_json_error(result, "Invalid OTP")

            # Now do it correctly
            result = self.google_oauth2_test(token_response, account_response, subdomain='zulip',
                                             mobile_flow_otp=mobile_flow_otp)
        self.assertEqual(result.status_code, 302)
        redirect_url = result['Location']
        parsed_url = urllib.parse.urlparse(redirect_url)
        query_params = urllib.parse.parse_qs(parsed_url.query)
        self.assertEqual(parsed_url.scheme, 'zulip')
        self.assertEqual(query_params["realm"], ['http://zulip.testserver'])
        self.assertEqual(query_params["email"], [self.user_profile.email])
        encrypted_api_key = query_params["otp_encrypted_api_key"][0]
        hamlet_api_keys = get_all_api_keys(self.user_profile)
        self.assertIn(otp_decrypt_api_key(encrypted_api_key, mobile_flow_otp), hamlet_api_keys)
        self.assertEqual(len(mail.outbox), 1)
        self.assertIn('Zulip on Android', mail.outbox[0].body)

    def get_log_into_subdomain(self, data: Dict[str, Any], *, key: Optional[str]=None, subdomain: str='zulip') -> HttpResponse:
        token = signing.dumps(data, salt=_subdomain_token_salt, key=key)
        url_path = reverse('zerver.views.auth.log_into_subdomain', args=[token])
        return self.client_get(url_path, subdomain=subdomain)

    def test_redirect_to_next_url_for_log_into_subdomain(self) -> None:
        def test_redirect_to_next_url(next: str='') -> HttpResponse:
            data = {'name': 'Hamlet',
                    'email': self.example_email("hamlet"),
                    'subdomain': 'zulip',
                    'is_signup': False,
                    'next': next}
            user_profile = self.example_user('hamlet')
            with mock.patch(
                    'zerver.views.auth.authenticate_remote_user',
                    return_value=(user_profile, {'invalid_subdomain': False})):
                with mock.patch('zerver.views.auth.do_login'):
                    result = self.get_log_into_subdomain(data)
            return result

        res = test_redirect_to_next_url()
        self.assertEqual(res.status_code, 302)
        self.assertEqual(res.url, 'http://zulip.testserver')
        res = test_redirect_to_next_url('/user_uploads/path_to_image')
        self.assertEqual(res.status_code, 302)
        self.assertEqual(res.url, 'http://zulip.testserver/user_uploads/path_to_image')

        res = test_redirect_to_next_url('/#narrow/stream/7-test-here')
        self.assertEqual(res.status_code, 302)
        self.assertEqual(res.url, 'http://zulip.testserver/#narrow/stream/7-test-here')

    def test_log_into_subdomain_when_signature_is_bad(self) -> None:
        data = {'name': 'Full Name',
                'email': self.example_email("hamlet"),
                'subdomain': 'zulip',
                'is_signup': False,
                'next': ''}
        with mock.patch('logging.warning') as mock_warning:
            result = self.get_log_into_subdomain(data, key='nonsense')
            mock_warning.assert_called_with("Subdomain cookie: Bad signature.")
        self.assertEqual(result.status_code, 400)

    def test_log_into_subdomain_when_signature_is_expired(self) -> None:
        data = {'name': 'Full Name',
                'email': self.example_email("hamlet"),
                'subdomain': 'zulip',
                'is_signup': False,
                'next': ''}
        with mock.patch('django.core.signing.time.time', return_value=time.time() - 45):
            token = signing.dumps(data, salt=_subdomain_token_salt)
        url_path = reverse('zerver.views.auth.log_into_subdomain', args=[token])
        with mock.patch('logging.warning') as mock_warning:
            result = self.client_get(url_path, subdomain='zulip')
            mock_warning.assert_called_once()
        self.assertEqual(result.status_code, 400)

    def test_log_into_subdomain_when_is_signup_is_true(self) -> None:
        data = {'name': 'Full Name',
                'email': self.example_email("hamlet"),
                'subdomain': 'zulip',
                'is_signup': True,
                'next': ''}
        result = self.get_log_into_subdomain(data)
        self.assertEqual(result.status_code, 200)
        self.assert_in_response('hamlet@zulip.com already has an account', result)

    def test_log_into_subdomain_when_is_signup_is_true_and_new_user(self) -> None:
        data = {'name': 'New User Name',
                'email': 'new@zulip.com',
                'subdomain': 'zulip',
                'is_signup': True,
                'next': ''}
        result = self.get_log_into_subdomain(data)
        self.assertEqual(result.status_code, 302)
        confirmation = Confirmation.objects.all().first()
        confirmation_key = confirmation.confirmation_key
        self.assertIn('do_confirm/' + confirmation_key, result.url)
        result = self.client_get(result.url)
        self.assert_in_response('action="/accounts/register/"', result)
        data = {"from_confirmation": "1",
                "full_name": data['name'],
                "key": confirmation_key}
        result = self.client_post('/accounts/register/', data, subdomain="zulip")
        self.assert_in_response("We just need you to do one last thing", result)

        # Verify that the user is asked for name but not password
        self.assert_not_in_success_response(['id_password'], result)
        self.assert_in_success_response(['id_full_name'], result)

    def test_log_into_subdomain_when_is_signup_is_false_and_new_user(self) -> None:
        data = {'name': 'New User Name',
                'email': 'new@zulip.com',
                'subdomain': 'zulip',
                'is_signup': False,
                'next': ''}
        result = self.get_log_into_subdomain(data)
        self.assertEqual(result.status_code, 200)
        self.assert_in_response('No account found for', result)
        self.assert_in_response('new@zulip.com.', result)
        self.assert_in_response('action="http://zulip.testserver/accounts/do_confirm/', result)

        url = re.findall('action="(http://zulip.testserver/accounts/do_confirm[^"]*)"', result.content.decode('utf-8'))[0]
        confirmation = Confirmation.objects.all().first()
        confirmation_key = confirmation.confirmation_key
        self.assertIn('do_confirm/' + confirmation_key, url)
        result = self.client_get(url)
        self.assert_in_response('action="/accounts/register/"', result)
        data = {"from_confirmation": "1",
                "full_name": data['name'],
                "key": confirmation_key}
        result = self.client_post('/accounts/register/', data, subdomain="zulip")
        self.assert_in_response("We just need you to do one last thing", result)

        # Verify that the user is asked for name but not password
        self.assert_not_in_success_response(['id_password'], result)
        self.assert_in_success_response(['id_full_name'], result)

    def test_log_into_subdomain_when_using_invite_link(self) -> None:
        data = {'name': 'New User Name',
                'email': 'new@zulip.com',
                'subdomain': 'zulip',
                'is_signup': True,
                'next': ''}

        realm = get_realm("zulip")
        realm.invite_required = True
        realm.save()

        stream_names = ["new_stream_1", "new_stream_2"]
        streams = []
        for stream_name in set(stream_names):
            stream = ensure_stream(realm, stream_name)
            streams.append(stream)

        # Without the invite link, we can't create an account due to invite_required
        result = self.get_log_into_subdomain(data)
        self.assertEqual(result.status_code, 200)
        self.assert_in_success_response(['Sign up for Zulip'], result)

        # Now confirm an invitation link works
        referrer = self.example_user("hamlet")
        multiuse_obj = MultiuseInvite.objects.create(realm=realm, referred_by=referrer)
        multiuse_obj.streams.set(streams)
        invite_link = create_confirmation_link(multiuse_obj, realm.host,
                                               Confirmation.MULTIUSE_INVITE)

        result = self.client_get(invite_link, subdomain="zulip")
        self.assert_in_success_response(['Sign up for Zulip'], result)

        result = self.get_log_into_subdomain(data)
        self.assertEqual(result.status_code, 302)

        confirmation = Confirmation.objects.all().last()
        confirmation_key = confirmation.confirmation_key
        self.assertIn('do_confirm/' + confirmation_key, result.url)
        result = self.client_get(result.url)
        self.assert_in_response('action="/accounts/register/"', result)
        data2 = {"from_confirmation": "1",
                 "full_name": data['name'],
                 "key": confirmation_key}
        result = self.client_post('/accounts/register/', data2, subdomain="zulip")
        self.assert_in_response("We just need you to do one last thing", result)

        # Verify that the user is asked for name but not password
        self.assert_not_in_success_response(['id_password'], result)
        self.assert_in_success_response(['id_full_name'], result)

        # Click confirm registration button.
        result = self.client_post(
            '/accounts/register/',
            {'full_name': 'New User Name',
             'key': confirmation_key,
             'terms': True})
        self.assertEqual(result.status_code, 302)
        self.assertEqual(sorted(self.get_streams('new@zulip.com', realm)), stream_names)

    def test_log_into_subdomain_when_email_is_none(self) -> None:
        data = {'name': None,
                'email': None,
                'subdomain': 'zulip',
                'is_signup': False,
                'next': ''}

        with mock.patch('logging.warning'):
            result = self.get_log_into_subdomain(data)
            self.assert_in_success_response(["You need an invitation to join this organization."], result)

    def test_user_cannot_log_into_nonexisting_realm(self) -> None:
        token_response = ResponseMock(200, {'access_token': "unique_token"})
        account_data = dict(name="Full Name",
                            email_verified=True,
                            email=self.example_email("hamlet"))
        account_response = ResponseMock(200, account_data)
        result = self.google_oauth2_test(token_response, account_response,
                                         subdomain='nonexistent')
        self.assert_in_success_response(["There is no Zulip organization hosted at this subdomain."],
                                        result)

    def test_user_cannot_log_into_wrong_subdomain(self) -> None:
        token_response = ResponseMock(200, {'access_token': "unique_token"})
        account_data = dict(name="Full Name",
                            email_verified=True,
                            email=self.example_email("hamlet"))
        account_response = ResponseMock(200, account_data)
        result = self.google_oauth2_test(token_response, account_response,
                                         subdomain='zephyr')
        self.assertEqual(result.status_code, 302)
        self.assertTrue(result.url.startswith("http://zephyr.testserver/accounts/login/subdomain/"))
        result = self.client_get(result.url.replace('http://zephyr.testserver', ''),
                                 subdomain="zephyr")
        self.assert_in_success_response(['Your email address, hamlet@zulip.com, is not in one of the domains ',
                                         'that are allowed to register for accounts in this organization.'], result)

    def test_user_cannot_log_into_wrong_subdomain_with_cookie(self) -> None:
        data = {'name': 'Full Name',
                'email': self.example_email("hamlet"),
                'subdomain': 'zephyr'}
        with mock.patch('logging.warning') as mock_warning:
            result = self.get_log_into_subdomain(data)
            mock_warning.assert_called_with("Login attempt on invalid subdomain")
        self.assertEqual(result.status_code, 400)

    def test_google_oauth2_registration(self) -> None:
        """If the user doesn't exist yet, Google auth can be used to register an account"""
        email = "newuser@zulip.com"
        realm = get_realm("zulip")
        token_response = ResponseMock(200, {'access_token': "unique_token"})
        account_data = dict(name="Full Name",
                            email_verified=True,
                            email=email)
        account_response = ResponseMock(200, account_data)
        result = self.google_oauth2_test(token_response, account_response, subdomain='zulip',
                                         is_signup='1')

        data = load_subdomain_token(result)
        name = 'Full Name'
        self.assertEqual(data['email'], email)
        self.assertEqual(data['name'], name)
        self.assertEqual(data['subdomain'], 'zulip')
        self.assertEqual(result.status_code, 302)
        parsed_url = urllib.parse.urlparse(result.url)
        uri = "{}://{}{}".format(parsed_url.scheme, parsed_url.netloc,
                                 parsed_url.path)
        self.assertTrue(uri.startswith('http://zulip.testserver/accounts/login/subdomain/'))

        result = self.client_get(result.url)
        self.assertEqual(result.status_code, 302)
        confirmation = Confirmation.objects.all().first()
        confirmation_key = confirmation.confirmation_key
        self.assertIn('do_confirm/' + confirmation_key, result.url)
        result = self.client_get(result.url)
        self.assert_in_response('action="/accounts/register/"', result)
        data = {"from_confirmation": "1",
                "full_name": name,
                "key": confirmation_key}
        result = self.client_post('/accounts/register/', data)
        self.assert_in_response("We just need you to do one last thing", result)

        # Verify that the user is asked for name but not password
        self.assert_not_in_success_response(['id_password'], result)
        self.assert_in_success_response(['id_full_name'], result)

        # Click confirm registration button.
        result = self.client_post(
            '/accounts/register/',
            {'full_name': name,
             'key': confirmation_key,
             'terms': True})

        self.assertEqual(result.status_code, 302)
        user_profile = get_user(email, realm)
        self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)

class GoogleLoginTest(GoogleOAuthTest):
    @override_settings(ROOT_DOMAIN_LANDING_PAGE=True)
    def test_google_oauth2_subdomains_homepage(self) -> None:
        token_response = ResponseMock(200, {'access_token': "unique_token"})
        account_data = dict(name=dict(formatted="Full Name"),
                            emails=[dict(type="account",
                                         value=self.example_email("hamlet"))])
        account_response = ResponseMock(200, account_data)
        result = self.google_oauth2_test(token_response, account_response, subdomain="")
        self.assertEqual(result.status_code, 302)
        self.assertIn('subdomain=1', result.url)

    def test_google_oauth2_400_token_response(self) -> None:
        token_response = ResponseMock(400, {})
        with mock.patch("logging.warning") as m:
            result = self.google_oauth2_test(token_response, ResponseMock(500, {}))
        self.assertEqual(result.status_code, 400)
        self.assertEqual(m.call_args_list[0][0][0],
                         "User error converting Google oauth2 login to token: Response text")

    def test_google_oauth2_500_token_response(self) -> None:
        token_response = ResponseMock(500, {})
        with mock.patch("logging.error") as m:
            result = self.google_oauth2_test(token_response, ResponseMock(500, {}))
        self.assertEqual(result.status_code, 400)
        self.assertEqual(m.call_args_list[0][0][0],
                         "Could not convert google oauth2 code to access_token: Response text")

    def test_google_oauth2_400_account_response(self) -> None:
        token_response = ResponseMock(200, {'access_token': "unique_token"})
        account_response = ResponseMock(400, {})
        with mock.patch("logging.warning") as m:
            result = self.google_oauth2_test(token_response, account_response)
        self.assertEqual(result.status_code, 400)
        self.assertEqual(m.call_args_list[0][0][0],
                         "Google login failed making info API call: Response text")

    def test_google_oauth2_500_account_response(self) -> None:
        token_response = ResponseMock(200, {'access_token': "unique_token"})
        account_response = ResponseMock(500, {})
        with mock.patch("logging.error") as m:
            result = self.google_oauth2_test(token_response, account_response)
        self.assertEqual(result.status_code, 400)
        self.assertEqual(m.call_args_list[0][0][0],
                         "Google login failed making API call: Response text")

    def test_google_oauth2_error_access_denied(self) -> None:
        result = self.client_get("/accounts/login/google/done/?error=access_denied")
        self.assertEqual(result.status_code, 302)
        path = urllib.parse.urlparse(result.url).path
        self.assertEqual(path, "/")

    def test_google_oauth2_error_other(self) -> None:
        with mock.patch("logging.warning") as m:
            result = self.client_get("/accounts/login/google/done/?error=some_other_error")
        self.assertEqual(result.status_code, 400)
        self.assertEqual(m.call_args_list[0][0][0],
                         "Error from google oauth2 login: some_other_error")

    def test_google_oauth2_missing_csrf(self) -> None:
        with mock.patch("logging.warning") as m:
            result = self.client_get("/accounts/login/google/done/")
        self.assertEqual(result.status_code, 400)
        self.assertEqual(m.call_args_list[0][0][0],
                         'Missing Google oauth2 CSRF state')

    def test_google_oauth2_csrf_malformed(self) -> None:
        with mock.patch("logging.warning") as m:
            result = self.client_get("/accounts/login/google/done/?state=badstate")
        self.assertEqual(result.status_code, 400)
        self.assertEqual(m.call_args_list[0][0][0],
                         'Missing Google oauth2 CSRF state')

    def test_google_oauth2_csrf_badstate(self) -> None:
        with mock.patch("logging.warning") as m:
            result = self.client_get("/accounts/login/google/done/?state=badstate:otherbadstate:more:::")
        self.assertEqual(result.status_code, 400)
        self.assertEqual(m.call_args_list[0][0][0],
                         'Google oauth2 CSRF error')

class JSONFetchAPIKeyTest(ZulipTestCase):
    def setUp(self) -> None:
        self.user_profile = self.example_user('hamlet')
        self.email = self.user_profile.email

    def test_success(self) -> None:
        self.login(self.email)
        result = self.client_post("/json/fetch_api_key",
                                  dict(user_profile=self.user_profile,
                                       password=initial_password(self.email)))
        self.assert_json_success(result)

    def test_not_loggedin(self) -> None:
        result = self.client_post("/json/fetch_api_key",
                                  dict(user_profile=self.user_profile,
                                       password=initial_password(self.email)))
        self.assert_json_error(result,
                               "Not logged in: API authentication or user session required", 401)

    def test_wrong_password(self) -> None:
        self.login(self.email)
        result = self.client_post("/json/fetch_api_key",
                                  dict(user_profile=self.user_profile,
                                       password="wrong"))
        self.assert_json_error(result, "Your username or password is incorrect.", 400)

class FetchAPIKeyTest(ZulipTestCase):
    def setUp(self) -> None:
        self.user_profile = self.example_user('hamlet')
        self.email = self.user_profile.email

    def test_success(self) -> None:
        result = self.client_post("/api/v1/fetch_api_key",
                                  dict(username=self.email,
                                       password=initial_password(self.email)))
        self.assert_json_success(result)

    def test_invalid_email(self) -> None:
        result = self.client_post("/api/v1/fetch_api_key",
                                  dict(username='hamlet',
                                       password=initial_password(self.email)))
        self.assert_json_error(result, "Enter a valid email address.", 400)

    def test_wrong_password(self) -> None:
        result = self.client_post("/api/v1/fetch_api_key",
                                  dict(username=self.email,
                                       password="wrong"))
        self.assert_json_error(result, "Your username or password is incorrect.", 403)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.GoogleMobileOauth2Backend',),
                       SEND_LOGIN_EMAILS=True)
    def test_google_oauth2_token_success(self) -> None:
        self.assertEqual(len(mail.outbox), 0)
        self.user_profile.date_joined = timezone_now() - datetime.timedelta(seconds=JUST_CREATED_THRESHOLD + 1)
        self.user_profile.save()
        with mock.patch(
                'apiclient.sample_tools.client.verify_id_token',
                return_value={
                    "email_verified": True,
                    "email": self.example_email("hamlet"),
                }):
            result = self.client_post("/api/v1/fetch_api_key",
                                      dict(username="google-oauth2-token",
                                           password="token"))
        self.assert_json_success(result)
        self.assertEqual(len(mail.outbox), 1)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.GoogleMobileOauth2Backend',))
    def test_google_oauth2_token_failure(self) -> None:
        payload = dict(email_verified=False)
        with mock.patch('apiclient.sample_tools.client.verify_id_token', return_value=payload):
            result = self.client_post("/api/v1/fetch_api_key",
                                      dict(username="google-oauth2-token",
                                           password="token"))
            self.assert_json_error(result, "Your username or password is incorrect.", 403)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.GoogleMobileOauth2Backend',))
    def test_google_oauth2_token_unregistered(self) -> None:
        with mock.patch(
                'apiclient.sample_tools.client.verify_id_token',
                return_value={
                    "email_verified": True,
                    "email": "nobody@zulip.com",
                }):
            result = self.client_post("/api/v1/fetch_api_key",
                                      dict(username="google-oauth2-token",
                                           password="token"))
        self.assert_json_error(
            result,
            "This user is not registered; do so from a browser.",
            403)

    def test_password_auth_disabled(self) -> None:
        with mock.patch('zproject.backends.password_auth_enabled', return_value=False):
            result = self.client_post("/api/v1/fetch_api_key",
                                      dict(username=self.email,
                                           password=initial_password(self.email)))
            self.assert_json_error_contains(result, "Password auth is disabled", 403)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_ldap_auth_email_auth_disabled_success(self) -> None:
        ldap_patcher = mock.patch('django_auth_ldap.config.ldap.initialize')
        self.mock_initialize = ldap_patcher.start()
        self.mock_ldap = MockLDAP()
        self.mock_initialize.return_value = self.mock_ldap
        self.backend = ZulipLDAPAuthBackend()

        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ]
            }
        }
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            result = self.client_post("/api/v1/fetch_api_key",
                                      dict(username=self.email,
                                           password="testing"))
        self.assert_json_success(result)
        self.mock_ldap.reset()
        self.mock_initialize.stop()

    def test_inactive_user(self) -> None:
        do_deactivate_user(self.user_profile)
        result = self.client_post("/api/v1/fetch_api_key",
                                  dict(username=self.email,
                                       password=initial_password(self.email)))
        self.assert_json_error_contains(result, "Your account has been disabled", 403)

    def test_deactivated_realm(self) -> None:
        do_deactivate_realm(self.user_profile.realm)
        result = self.client_post("/api/v1/fetch_api_key",
                                  dict(username=self.email,
                                       password=initial_password(self.email)))
        self.assert_json_error_contains(result, "This organization has been deactivated", 403)

class DevFetchAPIKeyTest(ZulipTestCase):
    def setUp(self) -> None:
        self.user_profile = self.example_user('hamlet')
        self.email = self.user_profile.email

    def test_success(self) -> None:
        result = self.client_post("/api/v1/dev_fetch_api_key",
                                  dict(username=self.email))
        self.assert_json_success(result)
        data = result.json()
        self.assertEqual(data["email"], self.email)
        user_api_keys = get_all_api_keys(self.user_profile)
        self.assertIn(data['api_key'], user_api_keys)

    def test_invalid_email(self) -> None:
        email = 'hamlet'
        result = self.client_post("/api/v1/dev_fetch_api_key",
                                  dict(username=email))
        self.assert_json_error_contains(result, "Enter a valid email address.", 400)

    def test_unregistered_user(self) -> None:
        email = 'foo@zulip.com'
        result = self.client_post("/api/v1/dev_fetch_api_key",
                                  dict(username=email))
        self.assert_json_error_contains(result, "This user is not registered.", 403)

    def test_inactive_user(self) -> None:
        do_deactivate_user(self.user_profile)
        result = self.client_post("/api/v1/dev_fetch_api_key",
                                  dict(username=self.email))
        self.assert_json_error_contains(result, "Your account has been disabled", 403)

    def test_deactivated_realm(self) -> None:
        do_deactivate_realm(self.user_profile.realm)
        result = self.client_post("/api/v1/dev_fetch_api_key",
                                  dict(username=self.email))
        self.assert_json_error_contains(result, "This organization has been deactivated", 403)

    def test_dev_auth_disabled(self) -> None:
        with mock.patch('zerver.views.auth.dev_auth_enabled', return_value=False):
            result = self.client_post("/api/v1/dev_fetch_api_key",
                                      dict(username=self.email))
            self.assert_json_error_contains(result, "Dev environment not enabled.", 400)

class DevGetEmailsTest(ZulipTestCase):
    def test_success(self) -> None:
        result = self.client_get("/api/v1/dev_list_users")
        self.assert_json_success(result)
        self.assert_in_response("direct_admins", result)
        self.assert_in_response("direct_users", result)

    def test_dev_auth_disabled(self) -> None:
        with mock.patch('zerver.views.auth.dev_auth_enabled', return_value=False):
            result = self.client_get("/api/v1/dev_list_users")
            self.assert_json_error_contains(result, "Dev environment not enabled.", 400)

class FetchAuthBackends(ZulipTestCase):
    def assert_on_error(self, error: Optional[str]) -> None:
        if error:
            raise AssertionError(error)

    def test_get_server_settings(self) -> None:
        def check_result(result: HttpResponse, extra_fields: List[Tuple[str, Validator]]=[]) -> None:
            authentication_methods_list = [
                ('password', check_bool),
            ]
            for backend_name_with_case in AUTH_BACKEND_NAME_MAP:
                authentication_methods_list.append((backend_name_with_case.lower(), check_bool))

            self.assert_json_success(result)
            checker = check_dict_only([
                ('authentication_methods', check_dict_only(authentication_methods_list)),
                ('email_auth_enabled', check_bool),
                ('is_incompatible', check_bool),
                ('require_email_format_usernames', check_bool),
                ('realm_uri', check_string),
                ('zulip_version', check_string),
                ('push_notifications_enabled', check_bool),
                ('msg', check_string),
                ('result', check_string),
            ] + extra_fields)
            self.assert_on_error(checker("data", result.json()))

        result = self.client_get("/api/v1/server_settings", subdomain="", HTTP_USER_AGENT="")
        check_result(result)

        result = self.client_get("/api/v1/server_settings", subdomain="", HTTP_USER_AGENT="ZulipInvalid")
        self.assertTrue(result.json()["is_incompatible"])

        with self.settings(ROOT_DOMAIN_LANDING_PAGE=False):
            result = self.client_get("/api/v1/server_settings", subdomain="", HTTP_USER_AGENT="")
        check_result(result)

        with self.settings(ROOT_DOMAIN_LANDING_PAGE=False):
            result = self.client_get("/api/v1/server_settings", subdomain="zulip", HTTP_USER_AGENT="")
        check_result(result, [
            ('realm_name', check_string),
            ('realm_description', check_string),
            ('realm_icon', check_string),
            ('realm_logo', check_string),
        ])

    def test_fetch_auth_backend_format(self) -> None:
        expected_keys = {'msg', 'password', 'zulip_version', 'result'}
        for backend_name_with_case in AUTH_BACKEND_NAME_MAP:
            expected_keys.add(backend_name_with_case.lower())

        result = self.client_get("/api/v1/get_auth_backends")
        self.assert_json_success(result)
        data = result.json()

        self.assertEqual(set(data.keys()), expected_keys)
        for backend in set(data.keys()) - {'msg', 'result', 'zulip_version'}:
            self.assertTrue(isinstance(data[backend], bool))

    def test_fetch_auth_backend(self) -> None:
        def get_expected_result(expected_backends: Set[str], password_auth_enabled: bool=False) -> Dict[str, Any]:
            result = {
                'msg': '',
                'result': 'success',
                'password': password_auth_enabled,
                'zulip_version': ZULIP_VERSION,
            }
            for backend_name_raw in AUTH_BACKEND_NAME_MAP:
                backend_name = backend_name_raw.lower()
                result[backend_name] = backend_name in expected_backends
            return result

        backends = [GoogleMobileOauth2Backend(), DevAuthBackend()]
        with mock.patch('django.contrib.auth.get_backends', return_value=backends):
            result = self.client_get("/api/v1/get_auth_backends")
            self.assert_json_success(result)
            data = result.json()
            # Check that a few keys are present, to guard against
            # AUTH_BACKEND_NAME_MAP being broken
            self.assertIn("email", data)
            self.assertIn("github", data)
            self.assertIn("google", data)
            self.assertEqual(data, get_expected_result({"google", "dev"}))

            # Test subdomains cases
            with self.settings(ROOT_DOMAIN_LANDING_PAGE=False):
                result = self.client_get("/api/v1/get_auth_backends")
                self.assert_json_success(result)
                data = result.json()
                self.assertEqual(data, get_expected_result({"google", "dev"}))

                # Verify invalid subdomain
                result = self.client_get("/api/v1/get_auth_backends",
                                         subdomain="invalid")
                self.assert_json_error_contains(result, "Invalid subdomain", 400)

                # Verify correct behavior with a valid subdomain with
                # some backends disabled for the realm
                realm = get_realm("zulip")
                do_set_realm_authentication_methods(realm, dict(Google=False, Email=False, Dev=True))
                result = self.client_get("/api/v1/get_auth_backends",
                                         subdomain="zulip")
                self.assert_json_success(result)
                data = result.json()
                self.assertEqual(data, get_expected_result({"dev"}))

            with self.settings(ROOT_DOMAIN_LANDING_PAGE=True):
                # With ROOT_DOMAIN_LANDING_PAGE, homepage fails
                result = self.client_get("/api/v1/get_auth_backends",
                                         subdomain="")
                self.assert_json_error_contains(result, "Subdomain required", 400)

                # With ROOT_DOMAIN_LANDING_PAGE, subdomain pages succeed
                result = self.client_get("/api/v1/get_auth_backends",
                                         subdomain="zulip")
                self.assert_json_success(result)
                data = result.json()
                self.assertEqual(data, get_expected_result({"dev"}))

class TestTwoFactor(ZulipTestCase):
    def test_direct_dev_login_with_2fa(self) -> None:
        email = self.example_email('hamlet')
        user_profile = self.example_user('hamlet')
        with self.settings(TWO_FACTOR_AUTHENTICATION_ENABLED=True):
            data = {'direct_email': email}
            result = self.client_post('/accounts/login/local/', data)
            self.assertEqual(result.status_code, 302)
            self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)
            # User logs in but when otp device doesn't exist.
            self.assertNotIn('otp_device_id', self.client.session.keys())

            self.create_default_device(user_profile)

            data = {'direct_email': email}
            result = self.client_post('/accounts/login/local/', data)
            self.assertEqual(result.status_code, 302)
            self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)
            # User logs in when otp device exists.
            self.assertIn('otp_device_id', self.client.session.keys())

    @mock.patch('two_factor.models.totp')
    def test_two_factor_login_with_ldap(self, mock_totp):
        # type: (mock.MagicMock) -> None
        token = 123456
        email = self.example_email('hamlet')
        password = 'testing'

        user_profile = self.example_user('hamlet')
        user_profile.set_password(password)
        user_profile.save()
        self.create_default_device(user_profile)

        def totp(*args, **kwargs):
            # type: (*Any, **Any) -> int
            return token

        mock_totp.side_effect = totp

        # Setup LDAP
        ldap_user_attr_map = {'full_name': 'fn', 'short_name': 'sn'}

        ldap_patcher = mock.patch('django_auth_ldap.config.ldap.initialize')
        mock_initialize = ldap_patcher.start()
        mock_ldap = MockLDAP()
        mock_initialize.return_value = mock_ldap

        full_name = 'New LDAP fullname'
        mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ],
                'fn': [full_name],
                'sn': ['shortname'],
            }
        }

        with self.settings(
                AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',),
                TWO_FACTOR_CALL_GATEWAY='two_factor.gateways.fake.Fake',
                TWO_FACTOR_SMS_GATEWAY='two_factor.gateways.fake.Fake',
                TWO_FACTOR_AUTHENTICATION_ENABLED=True,
                POPULATE_PROFILE_VIA_LDAP=True,
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_ATTR_MAP=ldap_user_attr_map,
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):

            first_step_data = {"username": email,
                               "password": password,
                               "two_factor_login_view-current_step": "auth"}
            result = self.client_post("/accounts/login/", first_step_data)
            self.assertEqual(result.status_code, 200)

            second_step_data = {"token-otp_token": str(token),
                                "two_factor_login_view-current_step": "token"}
            result = self.client_post("/accounts/login/", second_step_data)
            self.assertEqual(result.status_code, 302)
            self.assertEqual(result['Location'], 'http://zulip.testserver')

            # Going to login page should redirect to `realm.uri` if user is
            # already logged in.
            result = self.client_get('/accounts/login/')
            self.assertEqual(result.status_code, 302)
            self.assertEqual(result['Location'], 'http://zulip.testserver')

class TestDevAuthBackend(ZulipTestCase):
    def test_login_success(self) -> None:
        user_profile = self.example_user('hamlet')
        email = user_profile.email
        data = {'direct_email': email}
        result = self.client_post('/accounts/login/local/', data)
        self.assertEqual(result.status_code, 302)
        self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)

    def test_login_success_with_2fa(self) -> None:
        user_profile = self.example_user('hamlet')
        self.create_default_device(user_profile)
        email = user_profile.email
        data = {'direct_email': email}
        with self.settings(TWO_FACTOR_AUTHENTICATION_ENABLED=True):
            result = self.client_post('/accounts/login/local/', data)
        self.assertEqual(result.status_code, 302)
        self.assertEqual(result.url, 'http://zulip.testserver')
        self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)
        self.assertIn('otp_device_id', list(self.client.session.keys()))

    def test_redirect_to_next_url(self) -> None:
        def do_local_login(formaction: str) -> HttpResponse:
            user_email = self.example_email('hamlet')
            data = {'direct_email': user_email}
            return self.client_post(formaction, data)

        res = do_local_login('/accounts/login/local/')
        self.assertEqual(res.status_code, 302)
        self.assertEqual(res.url, 'http://zulip.testserver')

        res = do_local_login('/accounts/login/local/?next=/user_uploads/path_to_image')
        self.assertEqual(res.status_code, 302)
        self.assertEqual(res.url, 'http://zulip.testserver/user_uploads/path_to_image')

        # In local Email based authentication we never make browser send the hash
        # to the backend. Rather we depend upon the browser's behaviour of persisting
        # hash anchors in between redirect requests. See below stackoverflow conversation
        # https://stackoverflow.com/questions/5283395/url-hash-is-persisting-between-redirects
        res = do_local_login('/accounts/login/local/?next=#narrow/stream/7-test-here')
        self.assertEqual(res.status_code, 302)
        self.assertEqual(res.url, 'http://zulip.testserver')

    def test_login_with_subdomain(self) -> None:
        user_profile = self.example_user('hamlet')
        email = user_profile.email
        data = {'direct_email': email}

        result = self.client_post('/accounts/login/local/', data)
        self.assertEqual(result.status_code, 302)
        self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)

    def test_choose_realm(self) -> None:
        result = self.client_post('/devlogin/', subdomain="zulip")
        self.assert_in_success_response(["Click on a user to log in to Zulip Dev!"], result)
        self.assert_in_success_response(["iago@zulip.com", "hamlet@zulip.com"], result)

        result = self.client_post('/devlogin/', subdomain="")
        self.assert_in_success_response(["Click on a user to log in!"], result)
        self.assert_in_success_response(["iago@zulip.com", "hamlet@zulip.com"], result)
        self.assert_in_success_response(["starnine@mit.edu", "espuser@mit.edu"], result)

        data = {'new_realm': 'zephyr'}
        result = self.client_post('/devlogin/', data, subdomain="zulip")
        self.assertEqual(result.status_code, 302)
        self.assertEqual(result.url, "http://zephyr.testserver")
        result = self.client_get('/devlogin/', subdomain="zephyr")
        self.assert_in_success_response(["starnine@mit.edu", "espuser@mit.edu"], result)
        self.assert_in_success_response(["Click on a user to log in to MIT!"], result)
        self.assert_not_in_success_response(["iago@zulip.com", "hamlet@zulip.com"], result)

    def test_choose_realm_with_subdomains_enabled(self) -> None:
        with mock.patch('zerver.views.auth.is_subdomain_root_or_alias', return_value=False):
            with mock.patch('zerver.views.auth.get_realm_from_request', return_value=get_realm('zulip')):
                result = self.client_get("http://zulip.testserver/devlogin/")
                self.assert_in_success_response(["iago@zulip.com", "hamlet@zulip.com"], result)
                self.assert_not_in_success_response(["starnine@mit.edu", "espuser@mit.edu"], result)
                self.assert_in_success_response(["Click on a user to log in to Zulip Dev!"], result)

            with mock.patch('zerver.views.auth.get_realm_from_request', return_value=get_realm('zephyr')):
                result = self.client_post("http://zulip.testserver/devlogin/", {'new_realm': 'zephyr'})
                self.assertEqual(result["Location"], "http://zephyr.testserver")

                result = self.client_get("http://zephyr.testserver/devlogin/")
                self.assert_not_in_success_response(["iago@zulip.com", "hamlet@zulip.com"], result)
                self.assert_in_success_response(["starnine@mit.edu", "espuser@mit.edu"], result)
                self.assert_in_success_response(["Click on a user to log in to MIT!"], result)

    def test_login_failure(self) -> None:
        email = self.example_email("hamlet")
        data = {'direct_email': email}
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.EmailAuthBackend',)):
            with mock.patch('django.core.handlers.exception.logger'):
                response = self.client_post('/accounts/login/local/', data)
                self.assertRedirects(response, reverse('dev_not_supported'))

    def test_login_failure_due_to_nonexistent_user(self) -> None:
        email = 'nonexisting@zulip.com'
        data = {'direct_email': email}
        with mock.patch('django.core.handlers.exception.logger'):
            response = self.client_post('/accounts/login/local/', data)
            self.assertRedirects(response, reverse('dev_not_supported'))

class TestZulipRemoteUserBackend(ZulipTestCase):
    def test_login_success(self) -> None:
        user_profile = self.example_user('hamlet')
        email = user_profile.email
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',)):
            result = self.client_post('/accounts/login/sso/', REMOTE_USER=email)
            self.assertEqual(result.status_code, 302)
            self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)

    def test_login_success_with_sso_append_domain(self) -> None:
        username = 'hamlet'
        user_profile = self.example_user('hamlet')
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',),
                           SSO_APPEND_DOMAIN='zulip.com'):
            result = self.client_post('/accounts/login/sso/', REMOTE_USER=username)
            self.assertEqual(result.status_code, 302)
            self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)

    def test_login_failure(self) -> None:
        email = self.example_email("hamlet")
        result = self.client_post('/accounts/login/sso/', REMOTE_USER=email)
        self.assertEqual(result.status_code, 200)  # This should ideally be not 200.
        self.assertIs(get_session_dict_user(self.client.session), None)

    def test_login_failure_due_to_nonexisting_user(self) -> None:
        email = 'nonexisting@zulip.com'
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',)):
            result = self.client_post('/accounts/login/sso/', REMOTE_USER=email)
            self.assertEqual(result.status_code, 200)
            self.assertIs(get_session_dict_user(self.client.session), None)
            self.assert_in_response("No account found for", result)

    def test_login_failure_due_to_invalid_email(self) -> None:
        email = 'hamlet'
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',)):
            result = self.client_post('/accounts/login/sso/', REMOTE_USER=email)
            self.assert_json_error_contains(result, "Enter a valid email address.", 400)

    def test_login_failure_due_to_missing_field(self) -> None:
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',)):
            result = self.client_post('/accounts/login/sso/')
            self.assert_json_error_contains(result, "No REMOTE_USER set.", 400)

    def test_login_failure_due_to_wrong_subdomain(self) -> None:
        email = self.example_email("hamlet")
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',)):
            with mock.patch('zerver.views.auth.get_subdomain', return_value='acme'):
                result = self.client_post('http://testserver:9080/accounts/login/sso/',
                                          REMOTE_USER=email)
                self.assertEqual(result.status_code, 200)
                self.assertIs(get_session_dict_user(self.client.session), None)
                self.assert_in_response("You need an invitation to join this organization.", result)

    def test_login_failure_due_to_empty_subdomain(self) -> None:
        email = self.example_email("hamlet")
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',)):
            with mock.patch('zerver.views.auth.get_subdomain', return_value=''):
                result = self.client_post('http://testserver:9080/accounts/login/sso/',
                                          REMOTE_USER=email)
                self.assertEqual(result.status_code, 200)
                self.assertIs(get_session_dict_user(self.client.session), None)
                self.assert_in_response("You need an invitation to join this organization.", result)

    def test_login_success_under_subdomains(self) -> None:
        user_profile = self.example_user('hamlet')
        email = user_profile.email
        with mock.patch('zerver.views.auth.get_subdomain', return_value='zulip'):
            with self.settings(
                    AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',)):
                result = self.client_post('/accounts/login/sso/', REMOTE_USER=email)
                self.assertEqual(result.status_code, 302)
                self.assertIs(get_session_dict_user(self.client.session), user_profile.id)

    @override_settings(SEND_LOGIN_EMAILS=True)
    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',))
    def test_login_mobile_flow_otp_success_email(self) -> None:
        user_profile = self.example_user('hamlet')
        email = user_profile.email
        user_profile.date_joined = timezone_now() - datetime.timedelta(seconds=61)
        user_profile.save()
        mobile_flow_otp = '1234abcd' * 8

        # Verify that the right thing happens with an invalid-format OTP
        result = self.client_post('/accounts/login/sso/',
                                  dict(mobile_flow_otp="1234"),
                                  REMOTE_USER=email,
                                  HTTP_USER_AGENT = "ZulipAndroid")
        self.assertIs(get_session_dict_user(self.client.session), None)
        self.assert_json_error_contains(result, "Invalid OTP", 400)

        result = self.client_post('/accounts/login/sso/',
                                  dict(mobile_flow_otp="invalido" * 8),
                                  REMOTE_USER=email,
                                  HTTP_USER_AGENT = "ZulipAndroid")
        self.assertIs(get_session_dict_user(self.client.session), None)
        self.assert_json_error_contains(result, "Invalid OTP", 400)

        result = self.client_post('/accounts/login/sso/',
                                  dict(mobile_flow_otp=mobile_flow_otp),
                                  REMOTE_USER=email,
                                  HTTP_USER_AGENT = "ZulipAndroid")
        self.assertEqual(result.status_code, 302)
        redirect_url = result['Location']
        parsed_url = urllib.parse.urlparse(redirect_url)
        query_params = urllib.parse.parse_qs(parsed_url.query)
        self.assertEqual(parsed_url.scheme, 'zulip')
        self.assertEqual(query_params["realm"], ['http://zulip.testserver'])
        self.assertEqual(query_params["email"], [self.example_email("hamlet")])
        encrypted_api_key = query_params["otp_encrypted_api_key"][0]
        hamlet_api_keys = get_all_api_keys(self.example_user('hamlet'))
        self.assertIn(otp_decrypt_api_key(encrypted_api_key, mobile_flow_otp), hamlet_api_keys)
        self.assertEqual(len(mail.outbox), 1)
        self.assertIn('Zulip on Android', mail.outbox[0].body)

    @override_settings(SEND_LOGIN_EMAILS=True)
    @override_settings(SSO_APPEND_DOMAIN="zulip.com")
    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',))
    def test_login_mobile_flow_otp_success_username(self) -> None:
        user_profile = self.example_user('hamlet')
        email = user_profile.email
        remote_user = email_to_username(email)
        user_profile.date_joined = timezone_now() - datetime.timedelta(seconds=61)
        user_profile.save()
        mobile_flow_otp = '1234abcd' * 8

        # Verify that the right thing happens with an invalid-format OTP
        result = self.client_post('/accounts/login/sso/',
                                  dict(mobile_flow_otp="1234"),
                                  REMOTE_USER=remote_user,
                                  HTTP_USER_AGENT = "ZulipAndroid")
        self.assertIs(get_session_dict_user(self.client.session), None)
        self.assert_json_error_contains(result, "Invalid OTP", 400)

        result = self.client_post('/accounts/login/sso/',
                                  dict(mobile_flow_otp="invalido" * 8),
                                  REMOTE_USER=remote_user,
                                  HTTP_USER_AGENT = "ZulipAndroid")
        self.assertIs(get_session_dict_user(self.client.session), None)
        self.assert_json_error_contains(result, "Invalid OTP", 400)

        result = self.client_post('/accounts/login/sso/',
                                  dict(mobile_flow_otp=mobile_flow_otp),
                                  REMOTE_USER=remote_user,
                                  HTTP_USER_AGENT = "ZulipAndroid")
        self.assertEqual(result.status_code, 302)
        redirect_url = result['Location']
        parsed_url = urllib.parse.urlparse(redirect_url)
        query_params = urllib.parse.parse_qs(parsed_url.query)
        self.assertEqual(parsed_url.scheme, 'zulip')
        self.assertEqual(query_params["realm"], ['http://zulip.testserver'])
        self.assertEqual(query_params["email"], [self.example_email("hamlet")])
        encrypted_api_key = query_params["otp_encrypted_api_key"][0]
        hamlet_api_keys = get_all_api_keys(self.example_user('hamlet'))
        self.assertIn(otp_decrypt_api_key(encrypted_api_key, mobile_flow_otp), hamlet_api_keys)
        self.assertEqual(len(mail.outbox), 1)
        self.assertIn('Zulip on Android', mail.outbox[0].body)

    def test_redirect_to(self) -> None:
        """This test verifies the behavior of the redirect_to logic in
        login_or_register_remote_user."""
        def test_with_redirect_to_param_set_as_next(next: str='') -> HttpResponse:
            user_profile = self.example_user('hamlet')
            email = user_profile.email
            with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipRemoteUserBackend',)):
                result = self.client_post('/accounts/login/sso/?next=' + next, REMOTE_USER=email)
            return result

        res = test_with_redirect_to_param_set_as_next()
        self.assertEqual('http://zulip.testserver', res.url)
        res = test_with_redirect_to_param_set_as_next('/user_uploads/image_path')
        self.assertEqual('http://zulip.testserver/user_uploads/image_path', res.url)

        # Third-party domains are rejected and just send you to root domain
        res = test_with_redirect_to_param_set_as_next('https://rogue.zulip-like.server/login')
        self.assertEqual('http://zulip.testserver', res.url)

        # In SSO based auth we never make browser send the hash to the backend.
        # Rather we depend upon the browser's behaviour of persisting hash anchors
        # in between redirect requests. See below stackoverflow conversation
        # https://stackoverflow.com/questions/5283395/url-hash-is-persisting-between-redirects
        res = test_with_redirect_to_param_set_as_next('#narrow/stream/7-test-here')
        self.assertEqual('http://zulip.testserver', res.url)

class TestJWTLogin(ZulipTestCase):
    """
    JWT uses ZulipDummyBackend.
    """

    def test_login_success(self) -> None:
        payload = {'user': 'hamlet', 'realm': 'zulip.com'}
        with self.settings(JWT_AUTH_KEYS={'zulip': 'key'}):
            email = self.example_email("hamlet")
            realm = get_realm('zulip')
            auth_key = settings.JWT_AUTH_KEYS['zulip']
            web_token = jwt.encode(payload, auth_key).decode('utf8')

            user_profile = get_user(email, realm)
            data = {'json_web_token': web_token}
            result = self.client_post('/accounts/login/jwt/', data)
            self.assertEqual(result.status_code, 302)
            self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)

    def test_login_failure_when_user_is_missing(self) -> None:
        payload = {'realm': 'zulip.com'}
        with self.settings(JWT_AUTH_KEYS={'zulip': 'key'}):
            auth_key = settings.JWT_AUTH_KEYS['zulip']
            web_token = jwt.encode(payload, auth_key).decode('utf8')
            data = {'json_web_token': web_token}
            result = self.client_post('/accounts/login/jwt/', data)
            self.assert_json_error_contains(result, "No user specified in JSON web token claims", 400)

    def test_login_failure_when_realm_is_missing(self) -> None:
        payload = {'user': 'hamlet'}
        with self.settings(JWT_AUTH_KEYS={'zulip': 'key'}):
            auth_key = settings.JWT_AUTH_KEYS['zulip']
            web_token = jwt.encode(payload, auth_key).decode('utf8')
            data = {'json_web_token': web_token}
            result = self.client_post('/accounts/login/jwt/', data)
            self.assert_json_error_contains(result, "No organization specified in JSON web token claims", 400)

    def test_login_failure_when_key_does_not_exist(self) -> None:
        data = {'json_web_token': 'not relevant'}
        result = self.client_post('/accounts/login/jwt/', data)
        self.assert_json_error_contains(result, "Auth key for this subdomain not found.", 400)

    def test_login_failure_when_key_is_missing(self) -> None:
        with self.settings(JWT_AUTH_KEYS={'zulip': 'key'}):
            result = self.client_post('/accounts/login/jwt/')
            self.assert_json_error_contains(result, "No JSON web token passed in request", 400)

    def test_login_failure_when_bad_token_is_passed(self) -> None:
        with self.settings(JWT_AUTH_KEYS={'zulip': 'key'}):
            result = self.client_post('/accounts/login/jwt/')
            self.assert_json_error_contains(result, "No JSON web token passed in request", 400)
            data = {'json_web_token': 'bad token'}
            result = self.client_post('/accounts/login/jwt/', data)
            self.assert_json_error_contains(result, "Bad JSON web token", 400)

    def test_login_failure_when_user_does_not_exist(self) -> None:
        payload = {'user': 'nonexisting', 'realm': 'zulip.com'}
        with self.settings(JWT_AUTH_KEYS={'zulip': 'key'}):
            auth_key = settings.JWT_AUTH_KEYS['zulip']
            web_token = jwt.encode(payload, auth_key).decode('utf8')
            data = {'json_web_token': web_token}
            result = self.client_post('/accounts/login/jwt/', data)
            self.assertEqual(result.status_code, 200)  # This should ideally be not 200.
            self.assertIs(get_session_dict_user(self.client.session), None)

            # The /accounts/login/jwt/ endpoint should also handle the case
            # where the authentication attempt throws UserProfile.DoesNotExist.
            with mock.patch(
                    'zerver.views.auth.authenticate',
                    side_effect=UserProfile.DoesNotExist("Do not exist")):
                result = self.client_post('/accounts/login/jwt/', data)
            self.assertEqual(result.status_code, 200)  # This should ideally be not 200.
            self.assertIs(get_session_dict_user(self.client.session), None)

    def test_login_failure_due_to_wrong_subdomain(self) -> None:
        payload = {'user': 'hamlet', 'realm': 'zulip.com'}
        with self.settings(JWT_AUTH_KEYS={'acme': 'key'}):
            with mock.patch('zerver.views.auth.get_subdomain', return_value='acme'), \
                    mock.patch('logging.warning'):
                auth_key = settings.JWT_AUTH_KEYS['acme']
                web_token = jwt.encode(payload, auth_key).decode('utf8')

                data = {'json_web_token': web_token}
                result = self.client_post('/accounts/login/jwt/', data)
                self.assert_json_error_contains(result, "Wrong subdomain", 400)
                self.assertEqual(get_session_dict_user(self.client.session), None)

    def test_login_failure_due_to_empty_subdomain(self) -> None:
        payload = {'user': 'hamlet', 'realm': 'zulip.com'}
        with self.settings(JWT_AUTH_KEYS={'': 'key'}):
            with mock.patch('zerver.views.auth.get_subdomain', return_value=''), \
                    mock.patch('logging.warning'):
                auth_key = settings.JWT_AUTH_KEYS['']
                web_token = jwt.encode(payload, auth_key).decode('utf8')

                data = {'json_web_token': web_token}
                result = self.client_post('/accounts/login/jwt/', data)
                self.assert_json_error_contains(result, "Wrong subdomain", 400)
                self.assertEqual(get_session_dict_user(self.client.session), None)

    def test_login_success_under_subdomains(self) -> None:
        payload = {'user': 'hamlet', 'realm': 'zulip.com'}
        with self.settings(JWT_AUTH_KEYS={'zulip': 'key'}):
            with mock.patch('zerver.views.auth.get_subdomain', return_value='zulip'):
                auth_key = settings.JWT_AUTH_KEYS['zulip']
                web_token = jwt.encode(payload, auth_key).decode('utf8')

                data = {'json_web_token': web_token}
                result = self.client_post('/accounts/login/jwt/', data)
                self.assertEqual(result.status_code, 302)
                user_profile = self.example_user('hamlet')
                self.assertEqual(get_session_dict_user(self.client.session), user_profile.id)

class ZulipLDAPTestCase(ZulipTestCase):
    def setUp(self) -> None:
        user_profile = self.example_user('hamlet')
        self.setup_subdomain(user_profile)

        ldap_patcher = mock.patch('django_auth_ldap.config.ldap.initialize')
        self.mock_initialize = ldap_patcher.start()
        self.mock_ldap = MockLDAP()
        self.mock_initialize.return_value = self.mock_ldap
        self.backend = ZulipLDAPAuthBackend()
        # Internally `_realm` and `_prereg_user` attributes are automatically set
        # by the `authenticate()` method. But for testing the `get_or_build_user()`
        # method separately, we need to set them manually.
        self.backend._realm = get_realm('zulip')
        self.backend._prereg_user = None

    def tearDown(self) -> None:
        self.mock_ldap.reset()
        self.mock_initialize.stop()

    def setup_subdomain(self, user_profile: UserProfile) -> None:
        realm = user_profile.realm
        realm.string_id = 'zulip'
        realm.save()

class TestLDAP(ZulipLDAPTestCase):
    def test_generate_dev_ldap_dir(self) -> None:
        ldap_dir = generate_dev_ldap_dir('A', 10)
        self.assertEqual(len(ldap_dir), 10)
        regex = re.compile(r'(uid\=)+[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+(\,ou\=users\,dc\=zulip\,dc\=com)')
        common_attrs = ['cn', 'userPassword', 'phoneNumber', 'birthDate']
        for key, value in ldap_dir.items():
            self.assertTrue(regex.match(key))
            self.assertCountEqual(list(value.keys()), common_attrs + ['thumbnailPhoto', 'userAccountControl'])

        ldap_dir = generate_dev_ldap_dir('b', 9)
        self.assertEqual(len(ldap_dir), 9)
        regex = re.compile(r'(uid\=)+[a-zA-Z0-9_.+-]+(\,ou\=users\,dc\=zulip\,dc\=com)')
        for key, value in ldap_dir.items():
            self.assertTrue(regex.match(key))
            self.assertCountEqual(list(value.keys()), common_attrs + ['jpegPhoto'])

        ldap_dir = generate_dev_ldap_dir('c', 8)
        self.assertEqual(len(ldap_dir), 8)
        regex = re.compile(r'(uid\=)+[a-zA-Z0-9_.+-]+(\,ou\=users\,dc\=zulip\,dc\=com)')
        for key, value in ldap_dir.items():
            self.assertTrue(regex.match(key))
            self.assertCountEqual(list(value.keys()), common_attrs + ['email'])

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_dev_ldap_fail_login(self) -> None:
        # Tests that login with a substring of password fails. We had a bug in
        # dev LDAP environment that allowed login via password substrings.
        self.mock_ldap.directory = generate_dev_ldap_dir('B', 8)
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            user_profile = self.backend.authenticate('ldapuser1', 'dapu',
                                                     realm=get_realm('zulip'))

            assert(user_profile is None)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_success(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ]
            }
        }
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            user_profile = self.backend.authenticate(self.example_email("hamlet"), 'testing',
                                                     realm=get_realm('zulip'))

            assert(user_profile is not None)
            self.assertEqual(user_profile.email, self.example_email("hamlet"))

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_success_with_username(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ]
            }
        }
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            user_profile = self.backend.authenticate("hamlet", 'testing',
                                                     realm=get_realm('zulip'))

            assert(user_profile is not None)
            self.assertEqual(user_profile.email, self.example_email("hamlet"))

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_success_with_email_attr(self) -> None:
        self.mock_ldap.directory = {
            'uid=letham,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ],
                'email': ['hamlet@zulip.com'],
            }
        }
        with self.settings(LDAP_EMAIL_ATTR='email',
                           AUTH_LDAP_BIND_PASSWORD='',
                           AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            user_profile = self.backend.authenticate("letham", 'testing',
                                                     realm=get_realm('zulip'))

            assert (user_profile is not None)
            self.assertEqual(user_profile.email, self.example_email("hamlet"))

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_failure_due_to_wrong_password(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ]
            }
        }
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            user = self.backend.authenticate(self.example_email("hamlet"), 'wrong')
            self.assertIs(user, None)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_failure_due_to_nonexistent_user(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ]
            }
        }
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            user = self.backend.authenticate('nonexistent@zulip.com', 'testing')
            self.assertIs(user, None)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_ldap_permissions(self) -> None:
        backend = self.backend
        self.assertFalse(backend.has_perm(None, None))
        self.assertFalse(backend.has_module_perms(None, None))
        self.assertTrue(backend.get_all_permissions(None, None) == set())
        self.assertTrue(backend.get_group_permissions(None, None) == set())

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_django_to_ldap_username_without_append_domain(self) -> None:
        backend = self.backend
        username = backend.django_to_ldap_username('"hamlet@test"@zulip.com')
        self.assertEqual(username, '"hamlet@test"@zulip.com')

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_django_to_ldap_username_with_append_domain(self) -> None:
        backend = self.backend
        with self.settings(LDAP_APPEND_DOMAIN='zulip.com'):
            username = backend.django_to_ldap_username('"hamlet@test"@zulip.com')
            self.assertEqual(username, '"hamlet@test"')

            username = backend.django_to_ldap_username('"hamlet@test"@zulip')
            self.assertEqual(username, '"hamlet@test"@zulip')

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_django_to_ldap_username_with_invalid_domain(self) -> None:
        backend = self.backend
        with self.settings(LDAP_APPEND_DOMAIN='zulip.com'), \
                self.assertRaises(ZulipLDAPExceptionOutsideDomain):
            backend.django_to_ldap_username('"hamlet@test"@test.com')

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_ldap_to_django_username(self) -> None:
        backend = self.backend
        with self.settings(LDAP_APPEND_DOMAIN='zulip.com'):
            username = backend.ldap_to_django_username('"hamlet@test"')
            self.assertEqual(username, '"hamlet@test"@zulip.com')

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_get_or_build_user_when_user_exists(self) -> None:
        class _LDAPUser:
            attrs = {'fn': ['Full Name'], 'sn': ['Short Name']}

        backend = self.backend
        email = self.example_email("hamlet")
        user_profile, created = backend.get_or_build_user(str(email), _LDAPUser())
        self.assertFalse(created)
        self.assertEqual(user_profile.email, email)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_get_or_build_user_when_user_does_not_exist(self) -> None:
        class _LDAPUser:
            attrs = {'fn': ['Full Name'], 'sn': ['Short Name']}

        ldap_user_attr_map = {'full_name': 'fn', 'short_name': 'sn'}

        with self.settings(AUTH_LDAP_USER_ATTR_MAP=ldap_user_attr_map):
            backend = self.backend
            email = 'nonexisting@zulip.com'
            user_profile, created = backend.get_or_build_user(email, _LDAPUser())
            self.assertTrue(created)
            self.assertEqual(user_profile.email, email)
            self.assertEqual(user_profile.full_name, 'Full Name')

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_get_or_build_user_when_user_has_invalid_name(self) -> None:
        class _LDAPUser:
            attrs = {'fn': ['<invalid name>'], 'sn': ['Short Name']}

        ldap_user_attr_map = {'full_name': 'fn', 'short_name': 'sn'}

        with self.settings(AUTH_LDAP_USER_ATTR_MAP=ldap_user_attr_map):
            backend = self.backend
            email = 'nonexisting@zulip.com'
            with self.assertRaisesRegex(Exception, "Invalid characters in name!"):
                backend.get_or_build_user(email, _LDAPUser())

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_get_or_build_user_when_realm_is_deactivated(self) -> None:
        class _LDAPUser:
            attrs = {'fn': ['Full Name'], 'sn': ['Short Name']}

        ldap_user_attr_map = {'full_name': 'fn', 'short_name': 'sn'}

        with self.settings(AUTH_LDAP_USER_ATTR_MAP=ldap_user_attr_map):
            backend = self.backend
            email = 'nonexisting@zulip.com'
            do_deactivate_realm(backend._realm)
            with self.assertRaisesRegex(Exception, 'Realm has been deactivated'):
                backend.get_or_build_user(email, _LDAPUser())

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_get_or_build_user_when_ldap_has_no_email_attr(self) -> None:
        class _LDAPUser:
            attrs = {'fn': ['Full Name'], 'sn': ['Short Name']}

        nonexisting_attr = 'email'
        with self.settings(LDAP_EMAIL_ATTR=nonexisting_attr):
            backend = self.backend
            email = 'nonexisting@zulip.com'
            with self.assertRaisesRegex(Exception, 'LDAP user doesn\'t have the needed email attribute'):
                backend.get_or_build_user(email, _LDAPUser())

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_get_or_build_user_when_ldap_has_no_full_name_mapping(self) -> None:
        class _LDAPUser:
            attrs = {'fn': ['Full Name'], 'sn': ['Short Name']}

        with self.settings(AUTH_LDAP_USER_ATTR_MAP={}):
            backend = self.backend
            email = 'nonexisting@zulip.com'
            with self.assertRaisesRegex(Exception, "Missing required mapping for user's full name"):
                backend.get_or_build_user(email, _LDAPUser())

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_django_to_ldap_username_when_domain_does_not_match(self) -> None:
        backend = self.backend
        email = self.example_email("hamlet")
        with self.assertRaisesRegex(Exception, 'Email hamlet@zulip.com does not match LDAP domain acme.com.'):
            with self.settings(LDAP_APPEND_DOMAIN='acme.com'):
                backend.django_to_ldap_username(email)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_failure_when_domain_does_not_match(self) -> None:
        with self.settings(LDAP_APPEND_DOMAIN='acme.com'):
            user_profile = self.backend.authenticate(self.example_email("hamlet"), 'pass')
            self.assertIs(user_profile, None)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_failure_due_to_wrong_subdomain(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ]
            }
        }
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            user_profile = self.backend.authenticate(self.example_email("hamlet"), 'testing',
                                                     realm=get_realm('zephyr'))
            self.assertIs(user_profile, None)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_failure_due_to_invalid_subdomain(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ]
            }
        }
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            user_profile = self.backend.authenticate(self.example_email("hamlet"), 'testing',
                                                     realm=None)
            self.assertIs(user_profile, None)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_success_with_valid_subdomain(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ]
            }
        }
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            user_profile = self.backend.authenticate(self.example_email("hamlet"), 'testing',
                                                     realm=get_realm('zulip'))
            assert(user_profile is not None)
            self.assertEqual(user_profile.email, self.example_email("hamlet"))

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_failure_due_to_deactivated_user(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'userPassword': ['testing', ]
            }
        }
        user_profile = self.example_user("hamlet")
        do_deactivate_user(user_profile)
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            user_profile = self.backend.authenticate(self.example_email("hamlet"), 'testing',
                                                     realm=get_realm('zulip'))
            self.assertIs(user_profile, None)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    @override_settings(AUTH_LDAP_USER_ATTR_MAP={
        "full_name": "cn",
        "avatar": "thumbnailPhoto",
    })
    def test_login_success_when_user_does_not_exist_with_valid_subdomain(
            self) -> None:
        self.mock_ldap.directory = {
            'uid=nonexisting,ou=users,dc=acme,dc=com': {
                'cn': ['NonExisting', ],
                'userPassword': ['testing', ],
                'thumbnailPhoto': [open(os.path.join(settings.STATIC_ROOT, "images/team/tim.png"), "rb").read()],
            }
        }
        with self.settings(
                LDAP_APPEND_DOMAIN='acme.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=acme,dc=com'):
            user_profile = self.backend.authenticate('nonexisting@acme.com', 'testing',
                                                     realm=get_realm('zulip'))
            assert(user_profile is not None)
            self.assertEqual(user_profile.email, 'nonexisting@acme.com')
            self.assertEqual(user_profile.full_name, 'NonExisting')
            self.assertEqual(user_profile.realm.string_id, 'zulip')

            # Verify avatar gets created
            self.assertEqual(user_profile.avatar_source, UserProfile.AVATAR_FROM_USER)
            result = self.client_get(avatar_url(user_profile))
            self.assertEqual(result.status_code, 200)

    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_login_success_when_user_does_not_exist_with_split_full_name_mapping(self) -> None:
        self.mock_ldap.directory = {
            'uid=nonexisting,ou=users,dc=acme,dc=com': {
                'fn': ['Non', ],
                'ln': ['Existing', ],
                'userPassword': ['testing', ],
            }
        }
        with self.settings(
                LDAP_APPEND_DOMAIN='acme.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=acme,dc=com',
                AUTH_LDAP_USER_ATTR_MAP={'first_name': 'fn', 'last_name': 'ln'}):
            user_profile = self.backend.authenticate('nonexisting@acme.com', 'testing',
                                                     realm=get_realm('zulip'))
            assert(user_profile is not None)
            self.assertEqual(user_profile.email, 'nonexisting@acme.com')
            self.assertEqual(user_profile.full_name, 'Non Existing')
            self.assertEqual(user_profile.realm.string_id, 'zulip')

class TestZulipLDAPUserPopulator(ZulipLDAPTestCase):
    def test_authenticate(self) -> None:
        backend = ZulipLDAPUserPopulator()
        result = backend.authenticate(self.example_email("hamlet"), 'testing')  # type: ignore # complains that the function does not return any value!
        self.assertIs(result, None)

    def perform_ldap_sync(self, user_profile: UserProfile) -> None:
        with self.settings(
                LDAP_APPEND_DOMAIN='zulip.com',
                AUTH_LDAP_BIND_PASSWORD='',
                AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com'):
            result = sync_user_from_ldap(user_profile)
            self.assertTrue(result)

    def test_update_full_name(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['New Name', ],
            }
        }

        self.perform_ldap_sync(self.example_user('hamlet'))
        hamlet = self.example_user('hamlet')
        self.assertEqual(hamlet.full_name, 'New Name')

    def test_update_split_full_name(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'fn': ['Full', ],
                'ln': ['Name', ],
            }
        }

        with self.settings(AUTH_LDAP_USER_ATTR_MAP={'first_name': 'fn',
                                                    'last_name': 'ln'}):
            self.perform_ldap_sync(self.example_user('hamlet'))
        hamlet = self.example_user('hamlet')
        self.assertEqual(hamlet.full_name, 'Full Name')

    def test_same_full_name(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['King Hamlet', ],
            }
        }

        with mock.patch('zerver.lib.actions.do_change_full_name') as fn:
            self.perform_ldap_sync(self.example_user('hamlet'))
            fn.assert_not_called()

    def test_too_short_name(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['a', ],
            }
        }

        with self.assertRaises(ZulipLDAPException):
            self.perform_ldap_sync(self.example_user('hamlet'))

    def test_deactivate_user(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['King Hamlet', ],
                'userAccountControl': ['2', ],
            }
        }

        with self.settings(AUTH_LDAP_USER_ATTR_MAP={'full_name': 'cn',
                                                    'userAccountControl': 'userAccountControl'}):
            self.perform_ldap_sync(self.example_user('hamlet'))
        hamlet = self.example_user('hamlet')
        self.assertFalse(hamlet.is_active)

    def test_reactivate_user(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['King Hamlet', ],
                'userAccountControl': ['0', ],
            }
        }
        do_deactivate_user(self.example_user('hamlet'))

        with self.settings(AUTH_LDAP_USER_ATTR_MAP={'full_name': 'cn',
                                                    'userAccountControl': 'userAccountControl'}):
            self.perform_ldap_sync(self.example_user('hamlet'))
        hamlet = self.example_user('hamlet')
        self.assertTrue(hamlet.is_active)

    def test_update_user_avatar(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['King Hamlet', ],
                'thumbnailPhoto': [open(os.path.join(settings.STATIC_ROOT, "images/team/tim.png"), "rb").read()]
            }
        }
        with mock.patch('zerver.lib.upload.upload_avatar_image') as fn, \
            self.settings(AUTH_LDAP_USER_ATTR_MAP={'full_name': 'cn',
                                                   'avatar': 'thumbnailPhoto'}):
            self.perform_ldap_sync(self.example_user('hamlet'))
            fn.assert_called_once()
            hamlet = self.example_user('hamlet')
            self.assertEqual(hamlet.avatar_source, UserProfile.AVATAR_FROM_USER)

    def test_deactivate_non_matching_users(self) -> None:
        self.mock_ldap.directory = {}

        with self.settings(LDAP_APPEND_DOMAIN='zulip.com',
                           AUTH_LDAP_BIND_PASSWORD='',
                           AUTH_LDAP_USER_DN_TEMPLATE='uid=%(user)s,ou=users,dc=zulip,dc=com',
                           LDAP_DEACTIVATE_NON_MATCHING_USERS=True):
            result = sync_user_from_ldap(self.example_user('hamlet'))

            self.assertFalse(result)
            hamlet = self.example_user('hamlet')
            self.assertFalse(hamlet.is_active)

    def test_update_custom_profile_field(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['King Hamlet', ],
                'phoneNumber': ['123456789', ],
                'birthDate': ['1900-09-08', ],
            }
        }

        with self.settings(AUTH_LDAP_USER_ATTR_MAP={'full_name': 'cn',
                                                    'custom_profile_field__phone_number': 'phoneNumber',
                                                    'custom_profile_field__birthday': 'birthDate'}):
            self.perform_ldap_sync(self.example_user('hamlet'))
        hamlet = self.example_user('hamlet')
        test_data = [
            {
                'field_name': 'Phone number',
                'expected_value': '123456789',
            },
            {
                'field_name': 'Birthday',
                'expected_value': '1900-09-08',
            },
        ]
        for test_case in test_data:
            field = CustomProfileField.objects.get(realm=hamlet.realm, name=test_case['field_name'])
            field_value = CustomProfileFieldValue.objects.get(user_profile=hamlet, field=field).value
            self.assertEqual(field_value, test_case['expected_value'])

    def test_update_non_existent_profile_field(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['King Hamlet', ],
                'phoneNumber': ['123456789', ],
            }
        }
        with self.settings(AUTH_LDAP_USER_ATTR_MAP={'full_name': 'cn',
                                                    'custom_profile_field__non_existent': 'phoneNumber'}):
            with self.assertRaisesRegex(ZulipLDAPException, 'Custom profile field with name non_existent not found'):
                self.perform_ldap_sync(self.example_user('hamlet'))

    def test_update_custom_profile_field_invalid_data(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['King Hamlet', ],
                'birthDate': ['123456789', ],
            }
        }
        with self.settings(AUTH_LDAP_USER_ATTR_MAP={'full_name': 'cn',
                                                    'custom_profile_field__birthday': 'birthDate'}):
            with self.assertRaisesRegex(ZulipLDAPException, 'Invalid data for birthday field'):
                self.perform_ldap_sync(self.example_user('hamlet'))

    def test_update_custom_profile_field_no_mapping(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['King Hamlet', ],
                'birthDate': ['1990-01-01', ],
            }
        }
        hamlet = self.example_user('hamlet')
        no_op_field = CustomProfileField.objects.get(realm=hamlet.realm, name='Phone number')
        expected_value = CustomProfileFieldValue.objects.get(user_profile=hamlet, field=no_op_field).value

        with self.settings(AUTH_LDAP_USER_ATTR_MAP={'full_name': 'cn',
                                                    'custom_profile_field__birthday': 'birthDate'}):
            self.perform_ldap_sync(self.example_user('hamlet'))

        actual_value = CustomProfileFieldValue.objects.get(user_profile=hamlet, field=no_op_field).value
        self.assertEqual(actual_value, expected_value)

    def test_update_custom_profile_field_no_update(self) -> None:
        self.mock_ldap.directory = {
            'uid=hamlet,ou=users,dc=zulip,dc=com': {
                'cn': ['King Hamlet', ],
                'phoneNumber': ['new-number', ],
                'birthDate': ['1990-01-01', ],
            }
        }
        hamlet = self.example_user('hamlet')
        phone_number_field = CustomProfileField.objects.get(realm=hamlet.realm, name='Phone number')
        birthday_field = CustomProfileField.objects.get(realm=hamlet.realm, name='Birthday')
        phone_number_field_value = CustomProfileFieldValue.objects.get(user_profile=hamlet,
                                                                       field=phone_number_field)
        phone_number_field_value.value = 'new-number'
        phone_number_field_value.save(update_fields=['value'])
        expected_call_args = [hamlet, [
            {
                'id': birthday_field.id,
                'value': '1990-01-01',
            },
        ]]
        with self.settings(AUTH_LDAP_USER_ATTR_MAP={'full_name': 'cn',
                                                    'custom_profile_field__birthday': 'birthDate',
                                                    'custom_profile_field__phone_number': 'phoneNumber'}):
            with mock.patch('zproject.backends.do_update_user_custom_profile_data') as f:
                self.perform_ldap_sync(self.example_user('hamlet'))
                f.assert_called_once_with(*expected_call_args)

class TestZulipAuthMixin(ZulipTestCase):
    def test_get_user(self) -> None:
        backend = ZulipAuthMixin()
        result = backend.get_user(11111)
        self.assertIs(result, None)

class TestPasswordAuthEnabled(ZulipTestCase):
    def test_password_auth_enabled_for_ldap(self) -> None:
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',)):
            realm = Realm.objects.get(string_id='zulip')
            self.assertTrue(password_auth_enabled(realm))

class TestRequireEmailFormatUsernames(ZulipTestCase):
    def test_require_email_format_usernames_for_ldap_with_append_domain(
            self) -> None:
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',),
                           LDAP_APPEND_DOMAIN="zulip.com"):
            realm = Realm.objects.get(string_id='zulip')
            self.assertFalse(require_email_format_usernames(realm))

    def test_require_email_format_usernames_for_ldap_with_email_attr(
            self) -> None:
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',),
                           LDAP_EMAIL_ATTR="email"):
            realm = Realm.objects.get(string_id='zulip')
            self.assertFalse(require_email_format_usernames(realm))

    def test_require_email_format_usernames_for_email_only(self) -> None:
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.EmailAuthBackend',)):
            realm = Realm.objects.get(string_id='zulip')
            self.assertTrue(require_email_format_usernames(realm))

    def test_require_email_format_usernames_for_email_and_ldap_with_email_attr(
            self) -> None:
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.EmailAuthBackend',
                                                    'zproject.backends.ZulipLDAPAuthBackend'),
                           LDAP_EMAIL_ATTR="email"):
            realm = Realm.objects.get(string_id='zulip')
            self.assertFalse(require_email_format_usernames(realm))

    def test_require_email_format_usernames_for_email_and_ldap_with_append_email(
            self) -> None:
        with self.settings(AUTHENTICATION_BACKENDS=('zproject.backends.EmailAuthBackend',
                                                    'zproject.backends.ZulipLDAPAuthBackend'),
                           LDAP_APPEND_DOMAIN="zulip.com"):
            realm = Realm.objects.get(string_id='zulip')
            self.assertFalse(require_email_format_usernames(realm))

class TestMaybeSendToRegistration(ZulipTestCase):
    def test_sso_only_when_preregistration_user_does_not_exist(self) -> None:
        rf = RequestFactory()
        request = rf.get('/')
        request.session = {}
        request.user = None

        # Creating a mock Django form in order to keep the test simple.
        # This form will be returned by the create_hompage_form function
        # and will always be valid so that the code that we want to test
        # actually runs.
        class Form:
            def is_valid(self) -> bool:
                return True

        with self.settings(ONLY_SSO=True):
            with mock.patch('zerver.views.auth.HomepageForm', return_value=Form()):
                self.assertEqual(PreregistrationUser.objects.all().count(), 0)
                result = maybe_send_to_registration(request, self.example_email("hamlet"), is_signup=True)
                self.assertEqual(result.status_code, 302)
                confirmation = Confirmation.objects.all().first()
                confirmation_key = confirmation.confirmation_key
                self.assertIn('do_confirm/' + confirmation_key, result.url)
                self.assertEqual(PreregistrationUser.objects.all().count(), 1)

        result = self.client_get(result.url)
        self.assert_in_response('action="/accounts/register/"', result)
        self.assert_in_response('value="{0}" name="key"'.format(confirmation_key), result)

    def test_sso_only_when_preregistration_user_exists(self) -> None:
        rf = RequestFactory()
        request = rf.get('/')
        request.session = {}
        request.user = None

        # Creating a mock Django form in order to keep the test simple.
        # This form will be returned by the create_hompage_form function
        # and will always be valid so that the code that we want to test
        # actually runs.
        class Form:
            def is_valid(self) -> bool:
                return True

        email = self.example_email("hamlet")
        user = PreregistrationUser(email=email)
        user.save()

        with self.settings(ONLY_SSO=True):
            with mock.patch('zerver.views.auth.HomepageForm', return_value=Form()):
                self.assertEqual(PreregistrationUser.objects.all().count(), 1)
                result = maybe_send_to_registration(request, email, is_signup=True)
                self.assertEqual(result.status_code, 302)
                confirmation = Confirmation.objects.all().first()
                confirmation_key = confirmation.confirmation_key
                self.assertIn('do_confirm/' + confirmation_key, result.url)
                self.assertEqual(PreregistrationUser.objects.all().count(), 1)

class TestAdminSetBackends(ZulipTestCase):

    def test_change_enabled_backends(self) -> None:
        # Log in as admin
        self.login(self.example_email("iago"))
        result = self.client_patch("/json/realm", {
            'authentication_methods': ujson.dumps({u'Email': False, u'Dev': True})})
        self.assert_json_success(result)
        realm = get_realm('zulip')
        self.assertFalse(password_auth_enabled(realm))
        self.assertTrue(dev_auth_enabled(realm))

    def test_disable_all_backends(self) -> None:
        # Log in as admin
        self.login(self.example_email("iago"))
        result = self.client_patch("/json/realm", {
            'authentication_methods': ujson.dumps({u'Email': False, u'Dev': False})})
        self.assert_json_error(result, 'At least one authentication method must be enabled.')
        realm = get_realm('zulip')
        self.assertTrue(password_auth_enabled(realm))
        self.assertTrue(dev_auth_enabled(realm))

    def test_supported_backends_only_updated(self) -> None:
        # Log in as admin
        self.login(self.example_email("iago"))
        # Set some supported and unsupported backends
        result = self.client_patch("/json/realm", {
            'authentication_methods': ujson.dumps({u'Email': False, u'Dev': True, u'GitHub': False})})
        self.assert_json_success(result)
        realm = get_realm('zulip')
        # Check that unsupported backend is not enabled
        self.assertFalse(github_auth_enabled(realm))
        self.assertTrue(dev_auth_enabled(realm))
        self.assertFalse(password_auth_enabled(realm))

class EmailValidatorTestCase(ZulipTestCase):
    def test_valid_email(self) -> None:
        validate_login_email(self.example_email("hamlet"))

    def test_invalid_email(self) -> None:
        with self.assertRaises(JsonableError):
            validate_login_email(u'hamlet')

    def test_validate_email(self) -> None:
        inviter = self.example_user('hamlet')
        cordelia = self.example_user('cordelia')

        error, _ = validate_email(inviter, 'fred+5555@zulip.com')
        self.assertIn('containing + are not allowed', error)

        _, error = validate_email(inviter, cordelia.email)
        self.assertEqual(error, 'Already has an account.')

        cordelia.is_active = False
        cordelia.save()

        _, error = validate_email(inviter, cordelia.email)
        self.assertEqual(error, 'Already has an account.')

        _, error = validate_email(inviter, 'fred-is-fine@zulip.com')
        self.assertEqual(error, None)

class LDAPBackendTest(ZulipTestCase):
    @override_settings(AUTHENTICATION_BACKENDS=('zproject.backends.ZulipLDAPAuthBackend',))
    def test_non_existing_realm(self) -> None:
        email = self.example_email('hamlet')
        data = {'username': email, 'password': initial_password(email)}
        error_type = ZulipLDAPAuthBackend.REALM_IS_NONE_ERROR
        error = ZulipLDAPConfigurationError('Realm is None', error_type)
        with mock.patch('zproject.backends.ZulipLDAPAuthBackend.get_or_build_user',
                        side_effect=error), \
                mock.patch('django_auth_ldap.backend._LDAPUser._authenticate_user_dn'):
            response = self.client_post('/login/', data)
            self.assertEqual(response.status_code, 302)
            self.assertEqual(response.url, reverse('ldap_error_realm_is_none'))
            response = self.client_get(response.url)
            self.assert_in_response('You are trying to login using LDAP '
                                    'without creating an',
                                    response)