users/middleware.py

from django.contrib.auth.models import User
from django.utils import timezone
from django.utils import translation
import pytz


class SettingsMiddleware(object):
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        #
        # Set Timzone
        #
        if request.user.is_authenticated:
            try:
                timezone.activate(pytz.timezone(request.user.userprofile.timezone))
            except User.userprofile.RelatedObjectDoesNotExist:
                pass   # No profile
            except AttributeError:
                pass   # No User logged in
        else:
            timezone.deactivate()
        #
        # Set Language
        #
        try:
            language = request.user.userprofile.language_code
        except User.userprofile.RelatedObjectDoesNotExist:
            pass   # No profile
        except AttributeError:
            pass   # No User logged in
        else:
            translation.activate(language)
            request.LANGUAGE_CODE = translation.get_language()

        response = self.get_response(request)

        # Code to be executed for each request/response after
        # the view is called.

        return response