def do_complete(strategy, login, user=None, redirect_name='next',
                *args, **kwargs):
    # pop redirect value before the session is trashed on login()
    data = strategy.request_data()
    redirect_value = strategy.session_get(redirect_name, '') or \
                     data.get(redirect_name, '')

    is_authenticated = user_is_authenticated(user)
    user = is_authenticated and user or None

    partial = partial_pipeline_data(strategy, user, *args, **kwargs)
    if partial:
        xargs, xkwargs = partial
        user = strategy.continue_pipeline(*xargs, **xkwargs)
    else:
        user = strategy.complete(user=user, request=strategy.request,
                                 *args, **kwargs)

    if user and not isinstance(user, strategy.storage.user.user_model()):
        return user

    if is_authenticated:
        if not user:
            url = setting_url(strategy, redirect_value, 'LOGIN_REDIRECT_URL')
        else:
            url = setting_url(strategy, redirect_value,
                              'NEW_ASSOCIATION_REDIRECT_URL',
                              'LOGIN_REDIRECT_URL')
    elif user:
        if user_is_active(user):
            # catch is_new/social_user in case login() resets the instance
            is_new = getattr(user, 'is_new', False)
            social_user = user.social_user
            login(strategy, user, social_user)
            # store last login backend name in session
            strategy.session_set('social_auth_last_login_backend',
                                 social_user.provider)

            if is_new:
                url = setting_url(strategy, redirect_value,
                                  'NEW_USER_REDIRECT_URL',
                                  'LOGIN_REDIRECT_URL')
            else:
                url = setting_url(strategy, redirect_value,
                                  'LOGIN_REDIRECT_URL')
        else:
            url = setting_url(strategy, 'INACTIVE_USER_URL', 'LOGIN_ERROR_URL',
                              'LOGIN_URL')
    else:
        url = setting_url(strategy, 'LOGIN_ERROR_URL', 'LOGIN_URL')

    if redirect_value and redirect_value != url:
        redirect_value = quote(redirect_value)
        url += ('?' in url and '&' or '?') + \
               '{0}={1}'.format(redirect_name, redirect_value)

    if strategy.setting('SANITIZE_REDIRECTS', True):
        url = sanitize_redirect(strategy.request_host(), url) or \
              strategy.setting('LOGIN_REDIRECT_URL')
    return strategy.redirect(url)

 def get_object(self):
     user = self.request.user
     manual_redirect_uri = self.request.auth_data.pop('redirect_uri', None)
     manual_redirect_uri = self.get_redirect_uri(manual_redirect_uri)
     if manual_redirect_uri:
         self.request.backend.redirect_uri = manual_redirect_uri
     elif DOMAIN_FROM_ORIGIN:
         origin = self.request.strategy.request.META.get('HTTP_ORIGIN')
         if origin:
             relative_path = urlparse(self.request.backend.redirect_uri).path
             url = urlparse(origin)
             origin_scheme_host = "%s://%s" % (url.scheme, url.netloc)
             location = urljoin(origin_scheme_host, relative_path)
             self.request.backend.redirect_uri = iri_to_uri(location)
     is_authenticated = user_is_authenticated(user)
     user = is_authenticated and user or None
     # skip checking state by setting following params to False
     # it is responsibility of front-end to check state
     # TODO: maybe create an additional resource, where front-end will
     # store the state before making a call to oauth provider
     # so server can save it in session and consequently check it before
     # sending request to acquire access token.
     # In case of token authentication we need a way to store an anonymous
     # session to do it.
     self.request.backend.REDIRECT_STATE = False
     self.request.backend.STATE_PARAMETER = False
     user = self.request.backend.complete(user=user)
     return user

 def context_value():
     keys = [key for key in get_backends().keys()]
     accounts = dict(zip(keys, [None] * len(keys)))
     user = request.user
     if user_is_authenticated(user):
         accounts.update((assoc.provider, assoc)
                 for assoc in UserSocialAuth.get_social_auth_for_user(user))
     return accounts

def do_complete(strategy, login, user=None, redirect_name="next", *args, **kwargs):
    # pop redirect value before the session is trashed on login()
    data = strategy.request_data()
    redirect_value = strategy.session_get(redirect_name, "") or data.get(redirect_name, "")

    is_authenticated = user_is_authenticated(user)
    user = is_authenticated and user or None
    default_redirect = strategy.setting("LOGIN_REDIRECT_URL")
    url = default_redirect
    login_error_url = strategy.setting("LOGIN_ERROR_URL") or strategy.setting("LOGIN_URL")

    partial = partial_pipeline_data(strategy, user, *args, **kwargs)
    if partial is not None:
        idx, backend, xargs, xkwargs = partial
        if backend == strategy.backend.name:
            user = strategy.continue_pipeline(pipeline_index=idx, *xargs, **xkwargs)
        else:
            strategy.clean_partial_pipeline()
            user = strategy.complete(user=user, request=strategy.request, *args, **kwargs)
    else:
        user = strategy.complete(user=user, request=strategy.request, *args, **kwargs)

    if user and not isinstance(user, strategy.storage.user.user_model()):
        return user

    if is_authenticated:
        if not user:
            url = redirect_value or default_redirect
        else:
            url = redirect_value or strategy.setting("NEW_ASSOCIATION_REDIRECT_URL") or default_redirect
    elif user:
        if user_is_active(user):
            # catch is_new/social_user in case login() resets the instance
            is_new = getattr(user, "is_new", False)
            social_user = user.social_user
            login(strategy, user)
            # store last login backend name in session
            strategy.session_set("social_auth_last_login_backend", social_user.provider)

            # Remove possible redirect URL from session, if this is a new
            # account, send him to the new-users-page if defined.
            new_user_redirect = strategy.setting("NEW_USER_REDIRECT_URL")
            if new_user_redirect and is_new:
                url = new_user_redirect
            else:
                url = redirect_value or default_redirect
        else:
            url = strategy.setting("INACTIVE_USER_URL", login_error_url)
    else:
        url = login_error_url

    if redirect_value and redirect_value != url:
        redirect_value = quote(redirect_value)
        url += ("?" in url and "&" or "?") + "{0}={1}".format(redirect_name, redirect_value)
    if strategy.setting("SANITIZE_REDIRECTS", True):
        url = sanitize_redirect(strategy.request_host(), url) or strategy.setting("LOGIN_REDIRECT_URL")
    return strategy.redirect(url)

def do_complete(backend, login, user=None, redirect_name="next", *args, **kwargs):
    # pop redirect value before the session is trashed on login()
    data = backend.strategy.request_data()
    redirect_value = backend.strategy.session_get(redirect_name, "") or data.get(redirect_name, "")

    is_authenticated = user_is_authenticated(user)
    user = is_authenticated and user or None

    partial = partial_pipeline_data(backend, user, *args, **kwargs)
    if partial:
        xargs, xkwargs = partial
        user = backend.continue_pipeline(*xargs, **xkwargs)
    else:
        user = backend.complete(user=user, *args, **kwargs)

    user_model = backend.strategy.storage.user.user_model()
    if user and not isinstance(user, user_model):
        return user

    if is_authenticated:
        if not user:
            url = setting_url(backend, redirect_value, "LOGIN_REDIRECT_URL")
        else:
            url = setting_url(backend, redirect_value, "NEW_ASSOCIATION_REDIRECT_URL", "LOGIN_REDIRECT_URL")
    elif user:
        if user_is_active(user):
            # catch is_new/social_user in case login() resets the instance
            is_new = getattr(user, "is_new", False)
            social_user = user.social_user
            login(backend, user, social_user)
            # store last login backend name in session
            backend.strategy.session_set("social_auth_last_login_backend", social_user.provider)

            if is_new:
                url = setting_url(backend, "NEW_USER_REDIRECT_URL", redirect_value, "LOGIN_REDIRECT_URL")
            else:
                url = setting_url(backend, redirect_value, "LOGIN_REDIRECT_URL")
        else:
            url = setting_url(backend, "INACTIVE_USER_URL", "LOGIN_ERROR_URL", "LOGIN_URL")
    else:
        url = setting_url(backend, "LOGIN_ERROR_URL", "LOGIN_URL")

    if redirect_value and redirect_value != url:
        redirect_value = quote(redirect_value)
        url += ("?" in url and "&" or "?") + "{0}={1}".format(redirect_name, redirect_value)

    if backend.setting("SANITIZE_REDIRECTS", True):
        url = sanitize_redirect(backend.strategy.request_host(), url) or backend.setting("LOGIN_REDIRECT_URL")
    return backend.strategy.redirect(url)

def user_backends_data(user, backends, storage):
    """
    Will return backends data for given user, the return value will have the
    following keys:
        associated: UserSocialAuth model instances for currently associated
                    accounts
        not_associated: Not associated (yet) backend names
        backends: All backend names.

    If user is not authenticated, then 'associated' list is empty, and there's
    no difference between 'not_associated' and 'backends'.
    """
    available = list(load_backends(backends).keys())
    values = {'associated': [],
              'not_associated': available,
              'backends': available}
    if user_is_authenticated(user):
        associated = storage.user.get_social_auth_for_user(user)
        not_associated = list(set(available) - set(associated.provider))
                           #   set(associated.provider for assoc in associated))
        values['associated'] = associated
        values['not_associated'] = not_associated
    return values

 def test_user_has_is_authenticated_callable(self):
     class User(object):
         def is_authenticated(self):
             return True
     expect(user_is_authenticated(User())).to.equal(True)

 def test_user_has_is_authenticated(self):
     class User(object):
         is_authenticated = True
     expect(user_is_authenticated(User())).to.equal(True)

 def test_user_is_not_none(self):
     expect(user_is_authenticated(object())).to.equal(True)

 def test_user_is_none(self):
     expect(user_is_authenticated(None)).to.equal(False)

def do_complete(backend, login, user=None, redirect_name='next',
                *args, **kwargs):
    data = backend.strategy.request_data()

    is_authenticated = user_is_authenticated(user)
    user = is_authenticated and user or None

    partial = partial_pipeline_data(backend, user, *args, **kwargs)
    if partial:
        xargs, xkwargs = partial
        user = backend.continue_pipeline(*xargs, **xkwargs)
    else:
        user = backend.complete(user=user, *args, **kwargs)

    # pop redirect value before the session is trashed on login(), but after
    # the pipeline so that the pipeline can change the redirect if needed
    redirect_value = backend.strategy.session_get(redirect_name, '') or \
                     data.get(redirect_name, '')

    user_model = backend.strategy.storage.user.user_model()
    if user and not isinstance(user, user_model):
        return user

    if is_authenticated:
        if not user:
            url = setting_url(backend, redirect_value, 'LOGIN_REDIRECT_URL')
        else:
            url = setting_url(backend, redirect_value,
                              'NEW_ASSOCIATION_REDIRECT_URL',
                              'LOGIN_REDIRECT_URL')
    elif user:
        if user_is_active(user):
            # catch is_new/social_user in case login() resets the instance
            is_new = getattr(user, 'is_new', False)
            social_user = user.social_user
            login(backend, user, social_user)
            # store last login backend name in session
            backend.strategy.session_set('social_auth_last_login_backend',
                                         social_user.provider)

            if is_new:
                url = setting_url(backend,
                                  'NEW_USER_REDIRECT_URL',
                                  redirect_value,
                                  'LOGIN_REDIRECT_URL')
            else:
                url = setting_url(backend, redirect_value,
                                  'LOGIN_REDIRECT_URL')
        else:
            if backend.setting('INACTIVE_USER_LOGIN', False):
                social_user = user.social_user
                login(backend, user, social_user)
            url = setting_url(backend, 'INACTIVE_USER_URL', 'LOGIN_ERROR_URL',
                              'LOGIN_URL')
    else:
        url = setting_url(backend, 'LOGIN_ERROR_URL', 'LOGIN_URL')

    if redirect_value and redirect_value != url:
        redirect_value = quote(redirect_value)
        url += ('?' in url and '&' or '?') + \
               '{0}={1}'.format(redirect_name, redirect_value)

    if backend.setting('SANITIZE_REDIRECTS', True):
        allowed_hosts = backend.setting('ALLOWED_REDIRECT_HOSTS', []) + \
                        [backend.strategy.request_host()]
        url = sanitize_redirect(allowed_hosts, url) or \
              backend.setting('LOGIN_REDIRECT_URL')
    return backend.strategy.redirect(url)

def do_complete(strategy, login, user=None, redirect_name="next", *args, **kwargs):
    # pop redirect value before the session is trashed on login()
    data = strategy.request_data()
    redirect_value = strategy.session_get(redirect_name, "") or data.get(redirect_name, "")

    is_authenticated = user_is_authenticated(user)
    user = is_authenticated and user or None

    partial = partial_pipeline_data(strategy, user, *args, **kwargs)
    if partial:
        xargs, xkwargs = partial
        user = strategy.continue_pipeline(*xargs, **xkwargs)
    else:
        user = strategy.complete(user=user, request=strategy.request, *args, **kwargs)

    try:
        is_api_call = strategy.request.COOKIES.get("is_api_call")
    except:
        try:
            is_api_call = strategy.session_get("is_api_call")
        except:
            is_api_call = None

    if user and not isinstance(user, strategy.storage.user.user_model()):
        return user

    if is_authenticated:
        if not user:
            url = setting_url(strategy, redirect_value, "LOGIN_REDIRECT_URL")
        else:
            url = setting_url(strategy, redirect_value, "NEW_ASSOCIATION_REDIRECT_URL", "LOGIN_REDIRECT_URL")
        if is_api_call is not None:
            url = "/api/login/social/success/"
    elif user:
        if user_is_active(user):
            # catch is_new/social_user in case login() resets the instance
            is_new = getattr(user, "is_new", False)
            social_user = user.social_user
            login(strategy, user)
            # store last login backend name in session
            strategy.session_set("social_auth_last_login_backend", social_user.provider)

            if is_new:
                url = setting_url(strategy, redirect_value, "NEW_USER_REDIRECT_URL", "LOGIN_REDIRECT_URL")
            else:
                url = setting_url(strategy, redirect_value, "LOGIN_REDIRECT_URL")
            if is_api_call is not None:
                url = "/api/login/social/success/"
        else:
            url = setting_url(strategy, "INACTIVE_USER_URL", "LOGIN_ERROR_URL", "LOGIN_URL")
            if strategy.setting("INACTIVE_USER_REDIRECT_WITH_ID") is True:
                url += "?user_id=" + str(user.id)
                if is_api_call is not None:
                    url = "/api/login/social/fail/"
                    url += "?user_id=" + str(user.id) + "&reason=user_already_exist"
    else:
        url = setting_url(strategy, "LOGIN_ERROR_URL", "LOGIN_URL")

    if redirect_value and redirect_value != url:
        redirect_value = quote(redirect_value)
        url += ("?" in url and "&" or "?") + "{0}={1}".format(redirect_name, redirect_value)

    if strategy.setting("SANITIZE_REDIRECTS", True):
        url = sanitize_redirect(strategy.request_host(), url) or strategy.setting("LOGIN_REDIRECT_URL")
    return strategy.redirect(url)

    def _complete(self, backend, *args, **kwargs):
        strategy = self.strategy
        # pop redirect value before the session is trashed on login()
        redirect_value = self.session.get('next', '') or \
                         self.data.get('next', '')
        url = strategy.setting('LOGIN_REDIRECT_URL')

        user = self.get_current_user()
        is_authenticated = user_is_authenticated(user)
        if not is_authenticated:
            user = None

        if self.session.get('partial_pipeline'):
            data = self.session.pop('partial_pipeline')
            kwargs = kwargs.copy()
            kwargs.setdefault('user', user)
            idx, xargs, xkwargs = strategy.from_session(data, request=web.ctx,
                                                        *args, **kwargs)

            if xkwargs.get('backend', '') == backend:
                user = strategy.continue_pipeline(pipeline_index=idx,
                                                  *xargs, **xkwargs)
            else:
                strategy.clean_partial_pipeline()
                user = strategy.complete(user=user, request=web.ctx,
                                         *args, **kwargs)
        else:
            user = strategy.complete(user=user, request=web.ctx,
                                     *args, **kwargs)

        if isinstance(user, web.Storage):
            return user

        if is_authenticated:
            if not user:
                url = redirect_value or strategy.setting('LOGIN_REDIRECT_URL')
            else:
                url = redirect_value or \
                      strategy.setting('NEW_ASSOCIATION_REDIRECT_URL') or \
                      strategy.setting('LOGIN_REDIRECT_URL')
        elif user:
            if user_is_active(user):
                # catch is_new flag before login() resets the instance
                is_new = getattr(user, 'is_new', False)
                self.login_user(user)
                # user.social_user is the used UserSocialAuth instance defined
                # in authenticate process
                social_user = user.social_user
                # store last login backend name in session
                self.session['social_auth_last_login_backend'] = \
                        social_user.provider

                # Remove possible redirect URL from session, if this is a new
                # account, send him to the new-users-page if defined.
                new_user_redirect = strategy.setting('NEW_USER_REDIRECT_URL')
                if new_user_redirect and is_new:
                    url = new_user_redirect
                else:
                    url = redirect_value or \
                          strategy.setting('LOGIN_REDIRECT_URL')
            else:
                url = strategy.setting('INACTIVE_USER_URL') or \
                      strategy.setting('LOGIN_ERROR_URL') or \
                      strategy.setting('LOGIN_URL')
        else:
            url = strategy.setting('LOGIN_ERROR_URL') or \
                  strategy.setting('LOGIN_URL')

        if redirect_value and redirect_value != url:
            redirect_value = quote(redirect_value)
            url += ('?' in url and '&' or '?') + \
                   '%s=%s' % ('next', redirect_value)
        return web.seeother(url)

def do_complete(strategy, login, user=None, redirect_name='next',
                *args, **kwargs):
    # pop redirect value before the session is trashed on login()
    data = strategy.request_data()
    redirect_value = strategy.session_get(redirect_name, '') or \
                     data.get(redirect_name, '')

    is_authenticated = user_is_authenticated(user)
    user = is_authenticated and user or None
    default_redirect = strategy.setting('LOGIN_REDIRECT_URL')
    url = default_redirect
    login_error_url = strategy.setting('LOGIN_ERROR_URL') or \
                      strategy.setting('LOGIN_URL')

    partial = strategy.session_get('partial_pipeline', None)
    if partial is not None:
        idx, backend, xargs, xkwargs = strategy.from_session(partial)
        if backend == strategy.backend_name:
            kwargs = kwargs.copy()
            kwargs.setdefault('user', user)
            kwargs.update(xkwargs)
            user = strategy.continue_pipeline(pipeline_index=idx,
                                              *xargs, **xkwargs)
        else:
            strategy.clean_partial_pipeline()
            user = strategy.complete(user=user, request=strategy.request,
                                     *args, **kwargs)
    else:
        user = strategy.complete(user=user, request=strategy.request,
                                 *args, **kwargs)

    if user and not isinstance(user, strategy.storage.user.user_model()):
        return user

    if is_authenticated:
        if not user:
            url = redirect_value or default_redirect
        else:
            url = redirect_value or \
                  strategy.setting('NEW_ASSOCIATION_REDIRECT_URL') or \
                  default_redirect
    elif user:
        if user_is_active(user):
            # catch is_new/social_user in case login() resets the instance
            is_new = getattr(user, 'is_new', False)
            social_user = user.social_user
            login(strategy, user)
            # store last login backend name in session
            strategy.session_set('social_auth_last_login_backend',
                                 social_user.provider)

            # Remove possible redirect URL from session, if this is a new
            # account, send him to the new-users-page if defined.
            new_user_redirect = strategy.setting('NEW_USER_REDIRECT_URL')
            if new_user_redirect and is_new:
                url = new_user_redirect
            else:
                url = redirect_value or default_redirect
        else:
            url = strategy.setting('INACTIVE_USER_URL', login_error_url)
    else:
        url = login_error_url

    if redirect_value and redirect_value != url:
        redirect_value = quote(redirect_value)
        url += ('?' in url and '&' or '?') + \
               '%s=%s' % (redirect_name, redirect_value)
    return strategy.redirect(url)

 def test_user_has_is_authenticated_callable(self):
     class User(object):
         def is_authenticated(self):
             return True
     self.assertEqual(user_is_authenticated(User()), True)

 def test_user_has_is_authenticated(self):
     class User(object):
         is_authenticated = True
     self.assertEqual(user_is_authenticated(User()), True)

 def test_user_is_not_none(self):
     self.assertEqual(user_is_authenticated(object()), True)

 def test_user_is_none(self):
     self.assertEqual(user_is_authenticated(None), False)

def complete(backend, *args, **kwargs):
    """Authentication complete view, override this view if transaction
    management doesn't suit your needs."""
    strategy = g.strategy
    # pop redirect value before the session is trashed on login()
    redirect_value = session.get("next", "") or request.form.get("next", "") or request.args.get("next", "")

    is_authenticated = user_is_authenticated(g.user)
    user = is_authenticated and g.user or None
    url = strategy.setting("LOGIN_REDIRECT_URL")

    if session.get("partial_pipeline"):
        data = session.pop("partial_pipeline")
        kwargs = kwargs.copy()
        kwargs.setdefault("user", user)
        idx, xargs, xkwargs = strategy.from_session(data, request=request, *args, **kwargs)

        if xkwargs.get("backend", "") == backend:
            user = strategy.continue_pipeline(pipeline_index=idx, *xargs, **xkwargs)
        else:
            strategy.clean_partial_pipeline()
            user = strategy.complete(user=user, request=request, *args, **kwargs)
    else:
        user = strategy.complete(user=user, request=request, *args, **kwargs)

    if isinstance(user, Response):
        return user

    if is_authenticated:
        if not user:
            url = redirect_value or strategy.setting("LOGIN_REDIRECT_URL")
        else:
            url = (
                redirect_value
                or strategy.setting("NEW_ASSOCIATION_REDIRECT_URL")
                or strategy.setting("LOGIN_REDIRECT_URL")
            )
    elif user:
        if user_is_active(user):
            # catch is_new flag before login() resets the instance
            is_new = getattr(user, "is_new", False)
            login_user(user)
            # user.social_user is the used UserSocialAuth instance defined
            # in authenticate process
            social_user = user.social_user
            # store last login backend name in session
            session["social_auth_last_login_backend"] = social_user.provider

            # Remove possible redirect URL from session, if this is a new
            # account, send him to the new-users-page if defined.
            new_user_redirect = strategy.setting("NEW_USER_REDIRECT_URL")
            if new_user_redirect and is_new:
                url = new_user_redirect
            else:
                url = redirect_value or strategy.setting("LOGIN_REDIRECT_URL")
        else:
            url = (
                strategy.setting("INACTIVE_USER_URL")
                or strategy.setting("LOGIN_ERROR_URL")
                or strategy.setting("LOGIN_URL")
            )
    else:
        url = strategy.setting("LOGIN_ERROR_URL") or strategy.setting("LOGIN_URL")

    if redirect_value and redirect_value != url:
        redirect_value = quote(redirect_value)
        url += ("?" in url and "&" or "?") + "%s=%s" % ("next", redirect_value)
    return redirect(url)

def complete(request, backend, *args, **kwargs):
    """Authentication complete view, override this view if transaction
    management doesn't suit your needs."""
    strategy = request.strategy
    # pop redirect value before the session is trashed on login()
    redirect_value = request.session.get(REDIRECT_FIELD_NAME, '') or \
                     request.REQUEST.get(REDIRECT_FIELD_NAME, '')

    is_authenticated = user_is_authenticated(request.user)
    user = is_authenticated and request.user or None
    url = DEFAULT_REDIRECT

    if request.session.get('partial_pipeline'):
        data = request.session.pop('partial_pipeline')
        kwargs = kwargs.copy()
        kwargs.setdefault('user', user)
        idx, xargs, xkwargs = strategy.from_session(data, request=request,
                                                    *args, **kwargs)
        if xkwargs.get('backend', '') == backend:
            user = strategy.continue_pipeline(pipeline_index=idx,
                                              *xargs, **xkwargs)
        else:
            strategy.clean_partial_pipeline()
            user = strategy.complete(user=user, request=request,
                                     *args, **kwargs)
    else:
        user = strategy.complete(user=user, request=request,
                                 *args, **kwargs)

    if isinstance(user, HttpResponse):
        return user

    if is_authenticated:
        if not user:
            url = redirect_value or DEFAULT_REDIRECT
        else:
            url = redirect_value or \
                  strategy.setting('NEW_ASSOCIATION_REDIRECT_URL') or \
                  DEFAULT_REDIRECT
    elif user:
        if user_is_active(user):
            # catch is_new flag before login() resets the instance
            is_new = getattr(user, 'is_new', False)
            login(request, user)
            # Hack django.auth backend loading since they create an instance
            # that won't know about the strategy/storage layout being used
            request.session['original_' + BACKEND_SESSION_KEY] = \
                    request.session[BACKEND_SESSION_KEY]
            request.session[BACKEND_SESSION_KEY] = '%s.%s' % (
                BackendWrapper.__module__,
                BackendWrapper.__name__
            )
            # user.social_user is the used UserSocialAuth instance defined
            # in authenticate process
            social_user = user.social_user

            if setting('SESSION_EXPIRATION', True):
                # Set session expiration date if present and not disabled
                # by setting. Use last social-auth instance for current
                # provider, users can associate several accounts with
                # a same provider.
                expiration = social_user.expiration_datetime()
                if expiration:
                    try:
                        request.session.set_expiry(expiration)
                    except OverflowError:
                        # Handle django time zone overflow
                        request.session.set_expiry(None)

            # store last login backend name in session
            request.session['social_auth_last_login_backend'] = \
                    social_user.provider

            # Remove possible redirect URL from session, if this is a new
            # account, send him to the new-users-page if defined.
            new_user_redirect = strategy.setting('NEW_USER_REDIRECT_URL')
            if new_user_redirect and is_new:
                url = new_user_redirect
            else:
                url = redirect_value or strategy.setting('LOGIN_REDIRECT_URL')
        else:
            url = strategy.setting('INACTIVE_USER_URL', LOGIN_ERROR_URL)
    else:
        url = strategy.setting('LOGIN_ERROR_URL', LOGIN_ERROR_URL)

    if redirect_value and redirect_value != url:
        redirect_value = quote(redirect_value)
        url += ('?' in url and '&' or '?') + \
               '%s=%s' % (REDIRECT_FIELD_NAME, redirect_value)
    return HttpResponseRedirect(url)