apps/django_cas/decorators.py

   1 """Replacement authentication decorators that work around redirection loops"""
   2
   3 try:
   4     from functools import wraps
   5 except ImportError:
   6     from django.utils.functional import wraps
   7
   8 from django.contrib.auth import REDIRECT_FIELD_NAME
   9 from django.contrib.auth.decorators import login_required
  10 from django.http import HttpResponseForbidden, HttpResponseRedirect
  11 from django.utils.http import urlquote
  12
  13 __all__ = ['login_required', 'permission_required', 'user_passes_test']
  14
  15 def user_passes_test(test_func, login_url=None,
  16                      redirect_field_name=REDIRECT_FIELD_NAME):
  17     """Replacement for django.contrib.auth.decorators.user_passes_test that
  18     returns 403 Forbidden if the user is already logged in.
  19     """
  20
  21     if not login_url:
  22         from django.conf import settings
  23         login_url = settings.LOGIN_URL
  24
  25     def decorator(view_func):
  26         @wraps(view_func)
  27         def wrapper(request, *args, **kwargs):
  28             if test_func(request.user):
  29                 return view_func(request, *args, **kwargs)
  30             elif request.user.is_authenticated():
  31                 return HttpResponseForbidden('<h1>Permission denied</h1>')
  32             else:
  33                 path = '%s?%s=%s' % (login_url, redirect_field_name,
  34                                      urlquote(request.get_full_path()))
  35                 return HttpResponseRedirect(path)
  36         return wrapper
  37     return decorator
  38
  39
  40 def permission_required(perm, login_url=None):
  41     """Replacement for django.contrib.auth.decorators.permission_required that
  42     returns 403 Forbidden if the user is already logged in.
  43     """
  44
  45     return user_passes_test(lambda u: u.has_perm(perm), login_url=login_url)