Make it possible to download ics events

main/models.py

@@ -1,6 +1,9 @@
+from datetime import timedelta
+
 from django.contrib.auth.models import User
 from django.db import models
 from django.utils import formats
+from ics import Event as IcsEvent, Organizer, DisplayAlarm, Geo
 
 
 class Weekday(models.IntegerChoices):
@@ -83,5 +86,23 @@ class Event(models.Model):
     end_date = models.DateTimeField(null=True, blank=True)
     poster = models.FileField(upload_to="events/", null=True, blank=True)
 
+    def to_ics_event(self) -> IcsEvent:
+        ics_event = IcsEvent()
+        ics_event.name = self.name
+        ics_event.begin = self.start_date
+        ics_event.end = self.end_date if self.end_date else self.start_date + timedelta(hours=4)
+        ics_event.description = self.description
+        ics_event.location = f"{self.bar.street}, {self.bar.zip_code} {self.bar.city}"
+        if self.bar.latitude and self.bar.longitude:
+            ics_event.geo = Geo(self.bar.latitude, self.bar.longitude)
+        ics_event.status = "CONFIRMED"
+        ics_event.uid = f"event-{self.id}@studibars-ac.de"
+        ics_event.organizer = Organizer(common_name=self.bar.name, email="[email protected]")
+
+        # Add an alarm/reminder
+        alarm = DisplayAlarm(trigger=timedelta(days=-1))
+        ics_event.alarms.append(alarm)
+        return ics_event
+
     def __str__(self):
         return self.name

main/templates/main/main.html

@@ -221,7 +221,9 @@ <h5 class="text-nowrap text-black">{{ bar.name }}</h5>
                 <div class="card">
                     <div class="card-header d-flex justify-content-between">
                         <span class="fw-bold">{{ event.bar }}</span>
-                        <span>{{ event.start_date|date:"d.m." }} ab {{ event.start_date|date:"H:i" }}</span>
+                        <span>{{ event.start_date|date:"d.m." }} ab {{ event.start_date|date:"H:i" }}
+                            <a class="align-middle" href="{% url 'download_event_ics' event_id=event.id %}"><i class="bi bi-calendar-plus align-top"></i></a>
+                        </span>
                     </div>
                     {% if event.poster %}
                         {% generateimage 'studibars:poster1x' source=event.poster as img1 %}

main/urls.py

@@ -5,4 +5,5 @@
 
 urlpatterns = [
     path('main', views.main_view, name='main'),
+    path('ics/event/<int:event_id>/', views.download_event_ics, name='download_event_ics'),
 ]

main/views.py

@@ -1,6 +1,9 @@
 import datetime
 from collections import defaultdict
+
+from django.http import HttpResponse
 from django.shortcuts import render
+from ics import Calendar
 from rest_framework import viewsets, permissions
 
 from main.models import Bar, Weekday, Event
@@ -73,6 +76,17 @@ def main_view(request):
     })
 
 
+def download_event_ics(request, event_id):
+    event = Event.objects.get(id=event_id)
+
+    c = Calendar()
+    c.events.add(event.to_ics_event())
+
+    response = HttpResponse(c.serialize(), content_type='text/calendar')
+    response['Content-Disposition'] = f'attachment; filename={event.name}.ics'
+    return response
+
+
 # Allows all CRUP Operations
 class BarViewSet(viewsets.ModelViewSet):
     queryset = Bar.objects.all()

requirements.txt

@@ -4,6 +4,7 @@ Pillow # For ImageField
 djangorestframework
 drf-spectacular
 django-filter
+ics # für ics calendar
 django-imagekit # um im template thumbnails zu generieren https://github.com/matthewwithanm/django-imagekit
 # See https://github.com/zelenij/django-bootstrap-v5/issues/33
 git+https://github.com/math-a3k/django-bootstrap-v5.git@9d9f01988f0554028c0fd276939fc1336f0fa997#egg=django-bootstrap-v5