ie6_countdown_middleware.py

import re

from django.conf import settings
from django.http import HttpResponseRedirect

DEFAULT = 'http://www.getfirefox.com'

class IE6CountdownMiddleware(object):
    """
    Do *very* simple user agent scanning and redirect anyone accessing your site
    using an old Internet Explorer to a website to get a real browser.
    """
    def __init__(self):
        self.redirect_to = getattr(settings, 'IE6_COUNTDOWN_REDIRECT', DEFAULT)
        self.min_version = getattr(settings, 'IE6_COUNTDOWN_MIN_VERSION', 6)
        self.regex = re.compile('MSIE (\d)')
    
    def process_request(self, request):
        user_agent = request.META.get('HTTP_USER_AGENT', '')
        match = self.regex.search(user_agent)
        if match and int(match.group(1)) <= self.min_version:
            return HttpResponseRedirect(self.redirect_to)