Django URL Dispatcher example

urls.py

from django.conf import settings
from django.conf.urls import include, url
from django.conf.urls.static import static
from django.contrib import admin
from django.urls import Constraint, Resolver404

"""
where the following in in the project settings.py:

SITE_DOMAIN_MY = ('http', 'my.example.com')
SITE_DOMAIN_WWW = ('http', 'www.example.com')
SITE_DOMAIN_MANAGE = ('http', 'manage.example.com')

"""

class ConstraintBase(Constraint):
    """
    This exists purely as a way to ensure MRO mixin inheritance will work
    """
    def match(self, path, request=None):
        return path, (), {}

    def construct(self, url, *args, **kwargs):
        return url, args, kwargs


class SchemeConstraintMixin(object):
    scheme = ''

    def match(self, path, request=None):
        if request and request.scheme == self.scheme:
            return super(SchemeConstraintMixin, self).match(path, request)
        raise Resolver404()

    def construct(self, url, *args, **kwargs):
        url.scheme = self.scheme
        return super(SchemeConstraintMixin, self).construct(url, *args, **kwargs)


class HostConstraintMixin(object):
    host = ''

    def match(self, path, request=None):
        if request and request.get_host() == self.host:
            return super(HostConstraintMixin, self).match(path, request)
        raise Resolver404()

    def construct(self, url, *args, **kwargs):
        url.host = self.host
        return super(HostConstraintMixin, self).construct(url, *args, **kwargs)


class SchemeHostConstraint(SchemeConstraintMixin, HostConstraintMixin, ConstraintBase):
    def __init__(self, scheme, host):
        self.scheme = scheme
        self.host = host


www_urlpatterns = [
    url(r'^$', 'images.views.homepage', name='homepage'),
    url(r'^users/', include('users.urls.profiles')),
    url(r'^', include('images.urls')),
] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

my_urlpatterns = [
    url(r'^businesses/', include('businesses.urls.manage')),
    url(r'^user/', include('users.urls.auth')),
    url(r'^user/', include('users.urls.social')),
]

manage_urlpatterns = [
    url(r'^admin/', include(admin.site.urls)),
]

urlpatterns = [
    url(SchemeHostConstraint(*settings.SITE_DOMAIN_WWW), include(www_urlpatterns)),
    url(SchemeHostConstraint(*settings.SITE_DOMAIN_MY), include(my_urlpatterns)),
    url(SchemeHostConstraint(*settings.SITE_DOMAIN_MANAGE), include(manage_urlpatterns))
]