generate ICS with iCalendar package

cfp/models.py

@@ -320,18 +320,6 @@ class Talk(PonyConfModel):
         else:
             return None
 
-    @property
-    def dtstart(self):
-        return self.start_date.strftime('%Y%m%dT%H%M%SZ')
-
-    @property
-    def dtend(self):
-        return self.end_date.strftime('%Y%m%dT%H%M%SZ')
-
-    @property
-    def dtstamp(self):
-        return self.updated.strftime('%Y%m%dT%H%M%SZ')
-
     #@property
     #def materials_name(self):
     #    return basename(self.materials.name)

cfp/planning.py

@@ -5,6 +5,7 @@ from django.utils.timezone import localtime
 from django.core.cache import cache
 from django.core.urlresolvers import reverse
 from django.template.loader import get_template
+from django.conf import settings
 
 from datetime import datetime, timedelta
 from copy import deepcopy
@@ -12,6 +13,7 @@ from collections import OrderedDict, namedtuple
 from itertools import islice
 from zlib import adler32
 import xml.etree.ElementTree as ET
+from icalendar import Calendar as iCalendar, Event as iEvent
 
 from .models import Conference, Talk, Room
 
@@ -252,7 +254,27 @@ class Program:
     def _as_ics(self):
         if not self.initialized:
             self._lazy_init()
-        return get_template('cfp/planning.ics').render({'site': self.site, 'talks': self.talks})
+        cal = iCalendar()
+        cal.add('prodid', '-//PonyConf.io//PonyConf//FR')
+        cal.add('version', '2.0')
+        cal.add('x-wr-calname', self.conference.name)
+        cal.add('x-wr-timezone', settings.TIME_ZONE)
+        cal.add('calscale', 'GREGORIAN')
+        for talk in self.talks.all():
+            event = iEvent()
+            event.add('dtstart', talk.start_date)
+            if not talk.end_date:
+                continue
+            event.add('dtend', talk.end_date)
+            event.add('dtstamp', talk.updated)
+            event.add('summary', talk.title)
+            if talk.room:
+                event.add('location', talk.room)
+            event.add('status', 'CONFIRMED' if talk.accepted else 'TENTATIVE')
+            event.add('description', talk.description)
+            event.add('uid', '%s/%s' % (self.site.domain, talk.id))
+            cal.add_component(event)
+        return cal.to_ical()
 
     def render(self, output='html'):
         if self.cache:

cfp/templates/cfp/planning.ics

@@ -1,18 +0,0 @@
-BEGIN:VCALENDAR
-PRODID:-//{{ site.domain }}//{{ site.name }}//FR
-X-WR-CALNAME:{{ site.name }}
-X-WR-TIMEZONE:Europe/Paris
-VERSION:2.0
-CALSCALE:GREGORIAN
-{% for talk in talks %}
-BEGIN:VEVENT
-DTSTAMP:{{ talk.dtstamp }}
-DTSTART:{{ talk.dtstart }}
-DTEND:{{ talk.dtend }}
-SUMMARY:{{ talk.title }}
-LOCATION:{{ talk.room }}
-STATUS:{% if talk.accepted %}CONFIRMED{% else %}TENTATIVE{% endif %}
-DESCRIPTION:{{ talk.description|linebreaksbr }}
-UID:{{ site.domain }}/{{ talk.id }}
-END:VEVENT{% endfor %}
-END:VCALENDAR

cfp/views.py

@@ -481,17 +481,8 @@ def schedule(request, program_format, pending, cache, template):
     elif program_format == 'xml':
         return HttpResponse(program.render('xml'), content_type="application/xml")
     elif program_format == 'ics':
-        response = HttpResponse('', content_type='text/plain')
+        response = HttpResponse(program.render('ics'), content_type='text/calendar')
         response['Content-Disposition'] = 'attachment; filename="planning.ics"'
-        ics = []
-        for line in program.render('ics').split('\n'):
-            line = line.strip().replace('<br />', '')
-            if len(line) < 50:
-                ics.append(line)
-            else:  # https://icalendar.org/iCalendar-RFC-5545/3-1-content-lines.html
-                for i in range(ceil(len(line) / 50)):
-                    ics.append((' ' if i > 0 else '') + line[i * 50:(i + 1) * 50])
-        response.write('\r\n'.join([line for line in ics if line]).strip() + '\r\n')
         return response
     else:
         raise Http404(_("Format '%s' not available" % program_format))

requirements.in

@@ -10,3 +10,4 @@ django-colorful
 markdown
 bleach
 chardet
+icalendar

requirements.txt

@@ -15,7 +15,9 @@ django-crispy-forms==1.6.1
 django-select2==5.11.1
 django==1.11.5
 html5lib==0.999999999     # via bleach
+icalendar==3.11.7
 markdown==2.6.9
-pytz==2017.2              # via django
+python-dateutil==2.6.1    # via icalendar
-six==1.10.0               # via bleach, django-bower, html5lib
+pytz==2017.2              # via django, icalendar
+six==1.10.0               # via bleach, django-bower, html5lib, python-dateutil
 webencodings==0.5.1       # via html5lib