add iCal event calendar

bornhack/urls.py

@@ -10,6 +10,7 @@ from django.conf.urls import include, url
 from django.contrib import admin
 from django.views.generic import TemplateView, RedirectView
 from django.core.urlresolvers import reverse_lazy
+from program.views import ICSView
 
 urlpatterns = [
     url(
@@ -84,4 +85,5 @@ urlpatterns = [
     ),
     url(r'^accounts/', include('allauth.urls')),
     url(r'^admin/', include(admin.site.urls)),
+    url(r'^calendar/', ICSView.as_view()),
 ]

program/views.py

@@ -2,10 +2,38 @@ from collections import OrderedDict
 
 import datetime
 from django.views.generic import ListView, TemplateView, DetailView
+from django.views import View
+from django.http.response import HttpResponse
 
 from camps.models import Day
 from . import models
 
+import icalendar
+from icalendar import vDatetime
+
+def gen_icalevents(event):
+    for i in event.days.all():
+        ievent = icalendar.Event()
+        ievent['summary'] = event.title
+
+        newdate = datetime.datetime.combine(i.date, datetime.time(event.start.hour, event.start.minute, event.start.second))
+        ievent['dtstart'] = vDatetime(newdate).to_ical()
+
+        newdate = datetime.datetime.combine(i.date, datetime.time(event.end.hour, event.end.minute, event.end.second))
+        ievent['dtend'] = vDatetime(newdate).to_ical()
+
+        yield ievent
+
+def gen_ics(events):
+    cal = icalendar.Calendar()
+    for event in events:
+        for ical_event in gen_icalevents(event):
+            cal.add_component(ical_event)
+    return cal.to_ical()
+
+class ICSView(View):
+    def get(self, request, *args, **kwargs):
+        return HttpResponse(gen_ics(models.Event.objects.all()))
 
 class SpeakerDetailView(DetailView):
     model = models.Speaker

requirements/base.txt

@@ -10,3 +10,4 @@ qrcode==5.3
 CommonMark==0.6.4
 django-bleach==0.3.0
 Unidecode==0.4.19
+icalendar==3.10