Django Subdomain Middleware with CNAME support

hosts

[...]

# Fake DNS entries for testing the subdomain middleware
127.0.0.1	test1.django.local
127.0.0.1	test2.django.local
127.0.0.1	djangotest.christopher-williams.net
127.0.0.1	django.local

middleware.py

from django.utils.cache import patch_vary_headers
from django.conf import settings
from django.db.models import Q

from account.models import Account

class SubdomainMiddleware:
    def process_request(self, request):
        # Strip off the port, mostly useful for development environments
        fqdn = request.get_host().split(':')[0] 

        # Break up the domain into parts and get the subdomain slug
        domain_parts = fqdn.split('.')
        if len(domain_parts) > 2:
            subdomain = domain_parts[0]
            if subdomain.lower() == 'www':
                subdomain = None
        else:
            subdomain = None

        try:
            request.account = Account.objects.get(
                Q(cname=fqdn) |
                Q(slug=subdomain)
            )
        except Account.DoesNotExist:
            pass
        else:
            request.urlconf = settings.SUBDOMAIN_URLCONF

    def process_response(self, request, response):
        patch_vary_headers(response, ('Host',))
        return response