Export activites as an ICS Calendar

apps/activity/urls.py

@@ -14,4 +14,5 @@ urlpatterns = [
     path('<int:pk>/entry/', views.ActivityEntryView.as_view(), name='activity_entry'),
     path('<int:pk>/update/', views.ActivityUpdateView.as_view(), name='activity_update'),
     path('new/', views.ActivityCreateView.as_view(), name='activity_create'),
+    path('calendar.ics', views.CalendarView.as_view(), name='calendar_ics'),
 ]

apps/activity/views.py

@@ -1,14 +1,17 @@
 # Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
+from hashlib import md5
 
 from django.conf import settings
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.contrib.contenttypes.models import ContentType
 from django.core.exceptions import PermissionDenied
 from django.db.models import F, Q
+from django.http import HttpResponse
 from django.urls import reverse_lazy
 from django.utils import timezone
 from django.utils.translation import gettext_lazy as _
+from django.views import View
 from django.views.generic import DetailView, TemplateView, UpdateView
 from django_tables2.views import SingleTableView
 from note.models import Alias, NoteSpecial, NoteUser
@@ -281,3 +284,61 @@ class ActivityEntryView(LoginRequiredMixin, TemplateView):
                                                                       Entry(activity=a, note=self.request.user.note,))]
 
         return context
+
+
+class CalendarView(View):
+    """
+    Render an ICS calendar with all valid activities.
+    """
+
+    def multilines(self, string, maxlength, offset=0):
+        newstring = string[:maxlength - offset]
+        string = string[maxlength - offset:]
+        while string:
+            newstring += "\r\n "
+            newstring += string[:maxlength - 1]
+            string = string[maxlength - 1:]
+        return newstring
+
+    def get(self, request, *args, **kwargs):
+        ics = """BEGIN:VCALENDAR
+VERSION: 2.0
+PRODID:Note Kfet 2020
+X-WR-CALNAME:Kfet Calendar
+NAME:Kfet Calendar
+CALSCALE:GREGORIAN
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+TZURL:http://tzurl.org/zoneinfo-outlook/Europe/Berlin
+X-LIC-LOCATION:Europe/Berlin
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
+END:STANDARD
+END:VTIMEZONE
+"""
+        for activity in Activity.objects.filter(valid=True).order_by("-date_start").all():
+            ics += f"""BEGIN:VEVENT
+DTSTAMP:{"{:%Y%m%dT%H%M%S}".format(activity.date_start)}Z
+UID:{activity.id}
+SUMMARY;CHARSET=UTF-8:{self.multilines(activity.name, 75, 22)}
+DTSTART;TZID=Europe/Berlin:{"{:%Y%m%dT%H%M%S}".format(activity.date_start)}
+DTEND;TZID=Europe/Berlin:{"{:%Y%m%dT%H%M%S}".format(activity.date_end)}
+LOCATION:{self.multilines(activity.location, 75, 9) if activity.location else "Kfet"}
+DESCRIPTION;CHARSET=UTF-8:{self.multilines(activity.description, 75, 26)}
+ -- {activity.organizer.name}
+END:VEVENT
+"""
+        ics += "END:VCALENDAR"
+        ics = ics.replace("\r", "").replace("\n", "\r\n")
+        return HttpResponse(ics, content_type="text/calendar; charset=UTF-8")

apps/logs/signals.py

@@ -117,10 +117,7 @@ def delete_object(sender, instance, **kwargs):
     Each time a model is deleted, an entry in the table `Changelog` is added in the database
     """
     # noinspection PyProtectedMember
-    if instance._meta.label_lower in EXCLUDED:
-        return
-
-    if hasattr(instance, "_no_log"):
+    if instance._meta.label_lower in EXCLUDED or hasattr(instance, "_no_log"):
         return
 
     # Si un utilisateur est connecté, on récupère l'utilisateur courant ainsi que son adresse IP