plateforme-corres2math/apps/logs/signals.py

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import getpass
from corres2math.middlewares import get_current_authenticated_user, get_current_ip
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from django.contrib.auth.models import User
from django.contrib.contenttypes.models import ContentType
from rest_framework.renderers import JSONRenderer
from rest_framework.serializers import ModelSerializer
from .models import Changelog
# Ces modèles ne nécessitent pas de logs
EXCLUDED = [
'admin.logentry',
'authtoken.token',
'contenttypes.contenttype',
'logs.changelog', # Never remove this line
'mailer.dontsendentry',
'mailer.message',
'mailer.messagelog',
'migrations.migration',
'sessions.session',
]
def pre_save_object(sender, instance, **kwargs):
"""
Before a model get saved, we get the previous instance that is currently in the database
"""
qs = sender.objects.filter(pk=instance.pk).all()
if qs.exists():
instance._previous = qs.get()
else:
instance._previous = None
def save_object(sender, instance, **kwargs):
"""
Each time a model is saved, an entry in the table `Changelog` is added in the database
in order to store each modification made
"""
# noinspection PyProtectedMember
if instance._meta.label_lower in EXCLUDED or hasattr(instance, "_no_signal"):
return
# noinspection PyProtectedMember
previous = instance._previous
# Si un utilisateur est connecté, on récupère l'utilisateur courant ainsi que son adresse IP
user, ip = get_current_authenticated_user(), get_current_ip()
if user is None:
# Si la modification n'a pas été faite via le client Web, on suppose que c'est du à `manage.py`
# On récupère alors l'utilisateur·trice connecté·e à la VM, et on récupère la note associée
ip = "127.0.0.1"
username = getpass.getuser()
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user = User.objects.get(username=username) if User.objects.filter(username=username).exists() else None
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# On n'enregistre pas les connexions
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# noinspection PyProtectedMember
if user is not None and instance._meta.label_lower == "auth.user" and previous \
and instance.last_login != previous.last_login:
return
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changed_fields = '__all__'
if previous:
# On ne garde que les champs modifiés
changed_fields = []
for field in instance._meta.fields:
if field.name.endswith("_ptr"):
# A field ending with _ptr is a OneToOneRel with a subclass, e.g. NoteClub.note_ptr -> Note
continue
if getattr(instance, field.name) != getattr(previous, field.name):
changed_fields.append(field.name)
if len(changed_fields) == 0:
# Pas de log s'il n'y a pas de modification
return
# On crée notre propre sérialiseur JSON pour pouvoir sauvegarder les modèles avec uniquement les champs modifiés
class CustomSerializer(ModelSerializer):
class Meta:
model = instance.__class__
fields = changed_fields
previous_json = JSONRenderer().render(CustomSerializer(previous).data).decode("UTF-8") if previous else ""
instance_json = JSONRenderer().render(CustomSerializer(instance).data).decode("UTF-8")
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()
def delete_object(sender, instance, **kwargs):
"""
Each time a model is deleted, an entry in the table `Changelog` is added in the database
"""
# noinspection PyProtectedMember
if instance._meta.label_lower in EXCLUDED or hasattr(instance, "_no_signal"):
return
# Si un utilisateur est connecté, on récupère l'utilisateur courant ainsi que son adresse IP
user, ip = get_current_authenticated_user(), get_current_ip()
if user is None:
# Si la modification n'a pas été faite via le client Web, on suppose que c'est du à `manage.py`
# On récupère alors l'utilisateur·trice connecté·e à la VM, et on récupère la note associée
ip = "127.0.0.1"
username = getpass.getuser()
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user = User.objects.get(username=username) if User.objects.filter(username=username).exists() else None
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# On crée notre propre sérialiseur JSON pour pouvoir sauvegarder les modèles
class CustomSerializer(ModelSerializer):
class Meta:
model = instance.__class__
fields = '__all__'
instance_json = JSONRenderer().render(CustomSerializer(instance).data).decode("UTF-8")
Changelog.objects.create(user=user,
ip=ip,
model=ContentType.objects.get_for_model(instance),
instance_pk=instance.pk,
previous=instance_json,
data="",
action="delete"
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)