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# PermWrapper and PermLookupDict proxy the permissions system into objects that
# the template system can understand.
class PermLookupDict:
def __init__(self, user, app_label):
self.user, self.app_label = user, app_label
def __repr__(self):
return str(self.user.get_all_permissions())
def __getitem__(self, perm_name):
return self.user.has_perm("%s.%s" % (self.app_label, perm_name))
def __iter__(self):
# To fix 'item in perms.someapp' and __getitem__ interaction we need to
# define __iter__. See #18979 for details.
raise TypeError("PermLookupDict is not iterable.")
def __bool__(self):
return self.user.has_module_perms(self.app_label)
class PermWrapper:
def __init__(self, user):
self.user = user
def __repr__(self):
return f"{self.__class__.__qualname__}({self.user!r})"
def __getitem__(self, app_label):
return PermLookupDict(self.user, app_label)
def __iter__(self):
# I am large, I contain multitudes.
raise TypeError("PermWrapper is not iterable.")
def __contains__(self, perm_name):
"""
Lookup by "someapp" or "someapp.someperm" in perms.
"""
if "." not in perm_name:
# The name refers to module.
return bool(self[perm_name])
app_label, perm_name = perm_name.split(".", 1)
return self[app_label][perm_name]
def auth(request):
"""
Return context variables required by apps that use Django's authentication
system.
If there is no 'user' attribute in the request, use AnonymousUser (from
django.contrib.auth).
"""
if hasattr(request, "user"):
user = request.user
else:
from django.contrib.auth.models import AnonymousUser
user = AnonymousUser()
return {
"user": user,
"perms": PermWrapper(user),
}
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