feat: Send e-mail notifications to user

src/fellchensammlung/apps.py

@@ -15,3 +15,4 @@ class FellchensammlungConfig(AppConfig):
         except Permission.DoesNotExist:
             pass
         post_migrate.connect(ensure_languages, sender=self)
+        import fellchensammlung.receivers

src/fellchensammlung/mail.py

@@ -1,15 +1,10 @@
-from venv import create
-
-import django.conf.global_settings
 from django.db.models.signals import post_save
 from django.dispatch import receiver
 
 from django.utils.translation import gettext_lazy as _
-from django.utils.translation import gettext
 from django.conf import settings
 from django.core import mail
-from django.db.models import Q, Min
+from fellchensammlung.models import User, CommentNotification, BaseNotification
-from fellchensammlung.models import User
 from notfellchen.settings import host
 
 NEWLINE = "\r\n"
@@ -53,3 +48,14 @@ def mail_admins_new_member(sender, instance: User, created: bool, **kwargs):
         message = mail.EmailMessage(subject, body_text, settings.DEFAULT_FROM_EMAIL, [moderator.email])
         print("Sending email to ", moderator.email)
         message.send()
+
+
+def send_notification_email(notification_pk):
+    try:
+        notification = CommentNotification.objects.get(pk=notification_pk)
+    except CommentNotification.DoesNotExist:
+        notification = BaseNotification.objects.get(pk=notification_pk)
+    subject = f"🔔 {notification.title}"
+    body_text = notification.text
+    message = mail.EmailMessage(subject, body_text, settings.DEFAULT_FROM_EMAIL, [notification.user.email])
+    message.send()

src/fellchensammlung/receivers.py

@@ -0,0 +1,17 @@
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+from fellchensammlung.models import BaseNotification, CommentNotification
+from .tasks import task_send_notification_email
+
+
+@receiver(post_save, sender=CommentNotification)
+def comment_notification_receiver(sender, instance: BaseNotification, created: bool, **kwargs):
+    base_notification_receiver(sender, instance, created, **kwargs)
+
+
+@receiver(post_save, sender=BaseNotification)
+def base_notification_receiver(sender, instance: BaseNotification, created: bool, **kwargs):
+    if not created or not instance.user.email_notifications:
+        return
+    else:
+        task_send_notification_email.delay(instance.pk)

src/fellchensammlung/tasks.py

@@ -1,5 +1,7 @@
+from celery.app import shared_task
 from django.utils import timezone
 from notfellchen.celery import app as celery_app
+from .mail import send_notification_email
 from .tools.admin import clean_locations, deactivate_unchecked_adoption_notices, deactivate_404_adoption_notices
 from .tools.misc import healthcheck_ok
 from .models import Location, AdoptionNotice, Timestamp
@@ -43,3 +45,8 @@ def add_adoption_notice_location(pk):
 def task_healthcheck():
     healthcheck_ok()
     set_timestamp("task_healthcheck")
+
+
+@shared_task
+def task_send_notification_email(notification_pk):
+    send_notification_email(notification_pk)