nk20/apps/permission/signals.py

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# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later
from django.core.exceptions import PermissionDenied
from member.backends import PermissionBackend
2020-03-19 15:12:52 +00:00
from note_kfet.middlewares import get_current_authenticated_user
EXCLUDED = [
'cas_server.proxygrantingticket',
'cas_server.proxyticket',
'cas_server.serviceticket',
'cas_server.user',
'cas_server.userattributes',
'contenttypes.contenttype',
'logs.changelog',
'migrations.migration',
'sessions.session',
]
def pre_save_object(sender, instance, **kwargs):
"""
Before a model get saved, we check the permissions
"""
# noinspection PyProtectedMember
if instance._meta.label_lower in EXCLUDED:
return
user = get_current_authenticated_user()
if user is None:
# Action performed on shell is always granted
return
qs = sender.objects.filter(pk=instance.pk).all()
model_name_full = instance._meta.label_lower.split(".")
app_label = model_name_full[0]
model_name = model_name_full[1]
if qs.exists():
if PermissionBackend().has_perm(user, app_label + ".change_" + model_name, instance):
return
previous = qs.get()
for field in instance._meta.fields:
field_name = field.name
old_value = getattr(previous, field.name)
new_value = getattr(instance, field.name)
if old_value == new_value:
continue
if not PermissionBackend().has_perm(user, app_label + ".change_" + model_name + "_" + field_name, instance):
raise PermissionDenied
else:
if not PermissionBackend().has_perm(user, app_label + ".add_" + model_name, instance):
raise PermissionDenied
def pre_delete_object(sender, instance, **kwargs):
"""
Before a model get deleted, we check the permissions
"""
# noinspection PyProtectedMember
if instance._meta.label_lower in EXCLUDED:
return
user = get_current_authenticated_user()
if user is None:
# Action performed on shell is always granted
return
model_name_full = instance._meta.label_lower.split(".")
app_label = model_name_full[0]
model_name = model_name_full[1]
if not PermissionBackend().has_perm(user, app_label + ".delete_" + model_name, instance):
raise PermissionDenied