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import logging

from django.http import HttpResponseNotFound, HttpResponseRedirect

from django.utils.http import urlencode

from django.conf import settings

logger = logging.getLogger(__name__)

def redirect_to_login_service(request):

    users = settings.AUTHENTICATION_USERS

    host = settings.AUTHENTICATION_HOST

    if users is not None or host is None:

            return HttpResponseNotFound()

    if request.is_secure():

            proto = 'https://'

    else:

            proto = 'http://'

        next = request.GET.get('next', '')

        params = {'next': next}

        renew = 'renew' in request.GET

        if renew:

                params['renew'] = True

    uri = proto + host + '/login?' + urlencode(params)

    return HttpResponseRedirect(uri)