nk20/apps/logs/signals.py

120 lines
3.4 KiB
Python

# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later
import inspect
from django.contrib.contenttypes.models import ContentType
from django.core import serializers
from django.db.models.signals import pre_save, post_save, post_delete
from django.dispatch import receiver
from .models import Changelog
def get_request_in_signal(sender):
req = None
for entry in reversed(inspect.stack()):
try:
req = entry[0].f_locals['request']
# Check if there is a user
# noinspection PyStatementEffect
req.user
break
except:
pass
if not req:
print("WARNING: Attempt to save " + str(sender) + " with no user")
return req
def get_user_and_ip(sender):
req = get_request_in_signal(sender)
try:
user = req.user
if 'HTTP_X_FORWARDED_FOR' in req.META:
ip = req.META.get('HTTP_X_FORWARDED_FOR')
else:
ip = req.META.get('REMOTE_ADDR')
except:
user = None
ip = None
return user, ip
EXCLUDED = [
'admin.logentry',
'authtoken.token',
'cas_server.user',
'cas_server.userattributes',
'contenttypes.contenttype',
'logs.changelog',
'migrations.migration',
'note.noteuser',
'note.noteclub',
'note.notespecial',
'sessions.session',
'reversion.revision',
'reversion.version',
]
@receiver(pre_save)
def pre_save_object(sender, instance, **kwargs):
qs = sender.objects.filter(pk=instance.pk).all()
if qs.exists():
instance._previous = qs.get()
else:
instance._previous = None
@receiver(post_save)
def save_object(sender, instance, **kwargs):
# noinspection PyProtectedMember
if instance._meta.label_lower in EXCLUDED:
return
previous = instance._previous
user, ip = get_user_and_ip(sender)
if user is not None and instance._meta.label_lower == "auth.user" and previous:
# Don't save last login modifications
if instance.last_login != previous.last_login:
return
previous_json = serializers.serialize('json', [previous, ])[1:-1] if previous else None
instance_json = serializers.serialize('json', [instance, ])[1:-1]
if previous_json == instance_json:
# No modification
return
Changelog.objects.create(user=user,
ip=ip,
model=ContentType.objects.get_for_model(instance),
instance_pk=instance.pk,
previous=previous_json,
data=instance_json,
action=("edit" if previous else "create")
).save()
@receiver(post_delete)
def delete_object(sender, instance, **kwargs):
# noinspection PyProtectedMember
if instance._meta.label_lower in EXCLUDED:
return
user, ip = get_user_and_ip(sender)
instance_json = serializers.serialize('json', [instance, ])[1:-1]
Changelog.objects.create(user=user,
ip=ip,
model=ContentType.objects.get_for_model(instance),
instance_pk=instance.pk,
previous=instance_json,
data=None,
action="delete"
).save()