Django snippets

import re

from django.http import HttpResponseRedirect
from django.conf import settings
from django.contrib.sites.models import Site

class iPhoneMiddleware(object):
        def __init__(self):
                self.main_site = Site.objects.get(pk=1)
                self.mobile_site = Site.objects.get(pk=2)

        def process_request(self, request):
                if not request.session.get('mobile'):
                        p = re.compile('iPhone|iPod', re.IGNORECASE)
                        if p.search(request.META['HTTP_USER_AGENT']):
                                request.session['mobile'] = True
                        else:
                                request.session['mobile'] = False

                        return

                if not self.mobile_site == Site.objects.get_current():
                        if request.session.get('mobile'):
                                return HttpResponseRedirect('http://%s%s' % (self.mobile_site.domain, request.path))