[patch] Make urlresolver configureable

[django@…]

Currently the urlresolver is fix in the http.base module, which doesn't allow to customize how url's get resolved.
This patch implements a new config variable URL_RESOLVER which points to a class that will be used for resolving the url, makeing it easy to customize the behaviour of the django installation. For example, you could easy implement a weblog hosting where USER.example.org ist the weblog of the user, without touching apache. Or even use a database driven resolver.
The class will be initialized a little bit different then the current RegexURLResolver, because the request object is very usefull for a resolver class.

This patch also implements a HostURLResolver which also matches the hostname through a regular expression.
Note: The urlpatterns a different for this resolver:

urlpatterns = (
    (r'bla', patterns('',
          ...
    )),
    (r'^localhost$', patterns('',
         # Uncomment this for admin:
         (r'^admin/', include('django.contrib.admin.urls.admin')),
    )),
)

But it's for more advanced yours anyway, but I think it will be usefull for many people. The HostURLResolver is not that big, so i put it into core.urlresolvers.

[django@…]

patch v1

[Adrian Holovaty]

I'm closing this as a wontfix for now, but people can feel free to make this patch to their own code.

[django@…]

If i would strip down the patch to the absolut required changes, would possible to reopen and check it in ?
It's not that it's useless, i think it is usefull for many people not only me. People already asked on the mailing lists how to make subdomain specific resolvers. In my opinion it's a design flaw to have only possible way to resolve urls in a very flexible framework.

[django@…]

stripped down version of the patch + some changes to regexp urlresolver that allows easier customizations in custom resolvers

[django@…]

stripped down version of the patch + some changes to regexp urlresolver that allows easier customizations in custom resolvers. fixed typo

[Travis Cline]

Could this be reopened for discussion?

It's a fairly simple change that seems to fit the design philosophies and would eliminate some patchqueues against core.

[jholster]

A vote for this. Host is part of URL and thus should be available in urlpatterns.