Use signals to update internal ics

com/models.py

@@ -37,6 +37,7 @@ from django.templatetags.static import static
 from django.urls import reverse
 from django.utils import timezone
 from django.utils.translation import gettext_lazy as _
+from ics import Calendar, Event
 
 from club.models import Club
 from core.models import Notification, Preferences, User
@@ -46,6 +47,7 @@ from core.models import Notification, Preferences, User
 class IcsCalendar:
     _CACHE_FOLDER: Path = settings.MEDIA_ROOT / "com" / "calendars"
     _EXTERNAL_CALENDAR = _CACHE_FOLDER / "external.ics"
+    _INTERNAL_CALENDAR = _CACHE_FOLDER / "internal.ics"
 
     @classmethod
     def get_external(cls, expiration: timedelta = timedelta(hours=1)) -> Path | None:
@@ -74,6 +76,35 @@ class IcsCalendar:
             _ = f.write(calendar.data)
         return cls._EXTERNAL_CALENDAR
 
+    @classmethod
+    def get_internal(cls) -> Path:
+        if not cls._INTERNAL_CALENDAR.exists():
+            return cls.make_internal()
+        return cls._INTERNAL_CALENDAR
+
+    @classmethod
+    def make_internal(cls) -> Path:
+        # Updated through a post_save signal on News in com.signals
+        calendar = Calendar()
+        for news_date in NewsDate.objects.filter(
+            news__is_moderated=True,
+            end_date__gte=timezone.now()
+            - (timedelta(days=30) * 60),  # Roughly get the last 6 months
+        ).prefetch_related("news"):
+            event = Event(
+                name=news_date.news.title,
+                begin=news_date.start_date,
+                end=news_date.end_date,
+                url=reverse("com:news_detail", kwargs={"news_id": news_date.news.id}),
+            )
+            calendar.events.add(event)
+
+        # Create a file so we can offload the download to the reverse proxy if available
+        cls._CACHE_FOLDER.mkdir(parents=True, exist_ok=True)
+        with open(cls._INTERNAL_CALENDAR, "wb") as f:
+            _ = f.write(calendar.serialize().encode("utf-8"))
+        return cls._INTERNAL_CALENDAR
+
 
 class Sith(models.Model):
     """A one instance class storing all the modifiable infos."""