def perm_exists(self, perm, obj=None):
# determine whether a permission exists
try:
get_perm(perm, obj)
except self.DoesNotExist:
return False
return True
def has_perm(self, perm, obj=None):
# determine whether a user or a group has provided permission
if hasattr(self.instance, 'is_superuser') and self.instance.is_superuser:
return True
perm = get_perm(perm, obj)
if perm is None:
return False
else:
return self.all_perms().filter(pk=get_perm(perm, obj).pk).exists()
def get_perms(self, *perms, obj=None):
obj_perms = []
for perm in perms:
obj_perms.append(get_perm(perm, obj))
return obj_perms
def get_perm(self, perm, obj=None):
# get a permission if it belongs to group or user
perm = get_perm(perm, obj)
return self.all_perms().get(pk=perm.pk)