Misago/misago/middleware/theme.py

from urlparse import urlparse
from django.conf import settings
from django.core.cache import cache
from misago.theme import Theme

class ThemeMiddleware(object):
    def process_request(self, request):
        if not settings.INSTALLED_THEMES:
            raise ValueError('There are no themes installed!')
        request.theme = Theme(settings.INSTALLED_THEMES[0])

        if settings.MOBILE_SUBDOMAIN and settings.MOBILE_TEMPLATES:
            if settings.MOBILE_SUBDOMAIN == '*':
                request.theme = Theme(settings.MOBILE_TEMPLATES)
            else:
                mobile_domain = '%s.%s/' % (settings.MOBILE_SUBDOMAIN, urlparse(settings.BOARD_ADDRESS).netloc)
                current_domain = '%s.%s/' % (settings.MOBILE_SUBDOMAIN, urlparse(request.META.get('HTTP_HOST')).netloc)
                
                if current_domain == mobile_domain:
                    request.theme = Theme(settings.MOBILE_TEMPLATES)