@login_required
def switch_region(request, region_name,
                  redirect_field_name=auth.REDIRECT_FIELD_NAME):
    """Switches the user's region for all services except Identity service.

    The region will be switched if the given region is one of the regions
    available for the scoped project. Otherwise the region is not switched.
    """
    if region_name in request.user.available_services_regions:
        request.session['services_region'] = region_name
        LOG.debug('Switching services region to %s for user "%s".'
                  % (region_name, request.user.username))

    redirect_to = request.GET.get(redirect_field_name, '')
    if not is_safe_url(url=redirect_to, host=request.get_host()):
        redirect_to = settings.LOGIN_REDIRECT_URL

    response = shortcuts.redirect(redirect_to)
    utils.set_response_cookie(response, 'services_region',
                              request.session['services_region'])
    return response
dataset/ETHPy150Open openstack/django_openstack_auth/openstack_auth/views.py/switch_region/original