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
if perm is None:
return False
try:
self.get_perm(perm, obj)
except get_perm_model().DoesNotExist:
return False
return True
def get_perm(perm, obj=None):
perm_model = get_perm_model()
if perm is None or isinstance(perm, perm_model):
return perm
perm_kwargs = perm_model.get_perm_kwargs(perm, obj)
try:
perm = perm_model.objects.get(**perm_kwargs)
except perm_model.DoesNotExist:
if settings.PERM_AUTO_CREATE:
# create the required perm if it doesn't exist and is supposed to be created
perm = perm_model.objects.create(**perm_kwargs)
else:
# check if a wildcard permission exists instead
perm_kwargs['codename'] = enums.PERM_CODENAME_WILDCARD
perm = perm_model.objects.get(**perm_kwargs)
return perm
from django.apps import apps
from django.contrib.auth.backends import ModelBackend
from django.contrib.auth import get_user_model
from django.contrib.contenttypes.models import ContentType
from fperms import get_perm_model
from fperms.utils import get_content_type
Perm = get_perm_model()
def get_perm_from_permission_codename(permission_codename):
# get permission object based on django hard-coded permission codename
app_label, model_action = permission_codename.split('.', 1)
action, model_name = model_action.split('_')
model = apps.get_model(app_label, model_name)
return Perm.objects.get(
content_type=get_content_type(model),
codename=action,
object_id=None,
field_name=None,
)
class PermBackend(ModelBackend):
# authentication backend, mostly for compatibility with django admin site
def has_perm(self, user_obj, perm, obj=None):
if user_obj.is_superuser:
def _create_from_str(self, perm, obj):
# create a perm instance based on perm kwargs
perm_kwargs = get_perm_model().get_perm_kwargs(perm, obj)
return self.create(**perm_kwargs)
def get_from_str(self, perm, obj=None):
# get a perm instance based on perm kwargs
perm_kwargs = get_perm_model().get_perm_kwargs(perm, obj)
return self.get(**perm_kwargs)