Add method to check is user either staff or superuser.

[adambirds]

Add method to check is user either staff or superuser.

[adambirds]

Would be gerat if this method could be added @vitalik, let me know if it needs any amendments.

[vitalik]

I think the check of is_superuser (and naming it so) is obsolete

in django world if user is superuser that it's automatically is staff and has all the permissions

https://github.com/django/django/blob/41239fe34d64e801212dccaa4585e4802d0fac68/django/contrib/auth/models.py#L384-L397

I would just call it SessionAuthIsStaff :

class SessionAuthIsStaff(SessionAuthSuperUser):
    
    def authenticate(self, request: HttpRequest, key: Optional[str]) -> Optional[Any]:
        result = super().authenticate(request, key)
        if result:
              return result
        if getattr(request.user, "is_staff", None):
            return request.user

        return None

django_auth_is_staff = SessionAuthIsStaff()

[adambirds]

@vitalik I've made those changes.