django.contrib.sites integration

[parruc]

It would be really cool to have, in the predicates, an optional "site" parameter to easily integrate with the django.contrib.sites framework

[benwhalley]

This wouldn't work outside of a request. I can see it would be useful though — maybe even better to just expose the request to predicates, if it's available?

[dfunckt]

Passing the request sounds much more useful, but I wouldn't want to make it a required argument. The request could be passed as a context argument however. For plain rules, the caller can provide that directly, and for permissions it's trivial to write a custom backend that forwards it. I'd happily accept a PR.

[parruc]

Getting the whole request would be fantastic and I think it is the way to go. I can try to watch into it if somebody guides me into where these modifications should be made: I use rules a lot but never looked into it deeply.

[parruc]

I've looked into it a bit and looks like when some view checks a permission the following happens:
1- rules.contrib.views.PermissionRequiredMixin.has_permission is called. Here we have the request. we than call
2- django.contrib.auth.models.User.has_perms that calls in turn all the authentication backends passing only user, permission and object. Here we don't have the request anymore
3- rules.permissions.ObjectPermissionBackend forwards all received aguments to
4- rules.ruleset.test_rule that delegates the check (forwarding all params) to
5- rules.predicates.test that creates a context and returns the result.
Is this analysis correct or there is something I'm missing?

What I should do, if I got it right, is:
1- add request=NO_VALUE to the rules.predicates.test signature and in predicate context so that in my predicates I can do self.context.get("request").
2- add the request to the has_perm call in rules.contrib.views.PermissionRequiredMixin.has_permission
3- Somehow override the django.contrib.auth.models.User.has_perms method in order to forward the request, This is the biggest obstacle I see atm cause I dont see a way around it.

Any idea/thoughts/suggestion?

Thanks for the support

[parruc]

Regarding the third point I tried to open a ticket on the django tracker:

https://code.djangoproject.com/ticket/32255

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