djangoldp-notification/djangoldp_notification/models.py

import logging
from threading import Thread

import requests
from django.conf import settings
from django.contrib.admin.models import LogEntry
from django.contrib.sessions.models import Session
from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver
from oidc_provider.models import Token

from djangoldp.fields import LDPUrlField
from djangoldp.models import Model
from djangoldp.permissions import InboxPermissions


class Notification(Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='inbox')
    author_user = LDPUrlField()
    object = LDPUrlField()
    type = models.CharField(max_length=255)
    summary = models.TextField()
    date = models.DateTimeField(auto_now_add=True)
    read = models.BooleanField()

    class Meta:
        permissions = (
            ('view_notification', 'Read'),
            ('control_notification', 'Control'),
        )
        permission_classes=[InboxPermissions]
        ordering = ['date']

    def __str__(self):
        return '{}'.format(self.type)


class Subscription(Model):
    object = models.URLField()
    inbox = models.URLField()

    class Meta:
        permissions = (
            ('view_notification', 'Read'),
            ('control_notification', 'Control'),
        )

    def __str__(self):
        return '{}'.format(self.object)


# --- SUBSCRIPTION SYSTEM ---
@receiver(post_save, dispatch_uid="callback_notif")
def send_notification(sender, instance, **kwargs):
    if (sender != Notification and sender != LogEntry and sender != Session and sender != Token):
        threads = []
        url = settings.BASE_URL + Model.resource_id(instance) + '/'
        for subscription in Subscription.objects.filter(object=url):
            process = Thread(target=send_request, args=[subscription.inbox, url])
            process.start()
            threads.append(process)


def send_request(target, object_iri):
    try:
        req = requests.post(target,
                            json={"@context": "https://cdn.happy-dev.fr/owl/hdcontext.jsonld",
                                  "object": object_iri, "type": "update"},
                            headers={"Content-Type": "application/ld+json"})
    except:
        logging.error('Djangoldp_notifications: Error with request')
    return True