Return calendars as real files

com/api.py

@@ -1,7 +1,8 @@
-from datetime import timedelta
+from datetime import datetime, timedelta
+from pathlib import Path
 
 import urllib3
-from django.core.cache import cache
+from django.conf import settings
 from django.http import HttpResponse
 from django.urls import reverse
 from django.utils import timezone
@@ -9,30 +10,37 @@ from ics import Calendar, Event
 from ninja_extra import ControllerBase, api_controller, route
 
 from com.models import NewsDate
+from core.views.files import send_raw_file
 
 
 @api_controller("/calendar")
 class CalendarController(ControllerBase):
+    CACHE_FOLDER: Path = settings.MEDIA_ROOT / "com" / "calendars"
+
     @route.get("/external.ics")
     def calendar_external(self):
-        CACHE_KEY = "external_calendar"
-        if cached := cache.get(CACHE_KEY):
-            return HttpResponse(
-                cached,
-                content_type="text/calendar",
-                status=200,
-            )
+        file = self.CACHE_FOLDER / "external.ics"
+        # Return cached file if updated less than an our ago
+        if (
+            file.exists()
+            and timezone.make_aware(datetime.fromtimestamp(file.stat().st_mtime))
+            + timedelta(hours=1)
+            > timezone.now()
+        ):
+            return send_raw_file(file)
+
         calendar = urllib3.request(
             "GET",
             "https://calendar.google.com/calendar/ical/ae.utbm%40gmail.com/public/basic.ics",
         )
-        if calendar.status == 200:
-            cache.set(CACHE_KEY, calendar.data, 3600)  # Cache for one hour
-        return HttpResponse(
-            calendar.data,
-            content_type="text/calendar",
-            status=calendar.status,
-        )
+        if calendar.status != 200:
+            return HttpResponse(status=calendar.status)
+
+        self.CACHE_FOLDER.mkdir(parents=True, exist_ok=True)
+        with open(file, "wb") as f:
+            _ = f.write(calendar.data)
+
+        return send_raw_file(file)
 
     @route.get("/internal.ics")
     def calendar_internal(self):
@@ -50,7 +58,9 @@ class CalendarController(ControllerBase):
             )
             calendar.events.add(event)
 
-        return HttpResponse(
-            calendar.serialize().encode("utf-8"),
-            content_type="text/calendar",
-        )
+        # Create a file so we can offload the download to the reverse proxy if available
+        file = self.CACHE_FOLDER / "internal.ics"
+        self.CACHE_FOLDER.mkdir(parents=True, exist_ok=True)
+        with open(file, "wb") as f:
+            _ = f.write(calendar.serialize().encode("utf-8"))
+        return send_raw_file(file)