philo/contrib/julian/feedgenerator.py

   1 from django.http import HttpResponse
   2 from django.utils.feedgenerator import SyndicationFeed
   3 import vobject
   4
   5
   6 # Map the keys in the ICalendarFeed internal dictionary to the names of iCalendar attributes.
   7 FEED_ICAL_MAP = {
   8         'title': 'x-wr-calname',
   9         'description': 'x-wr-caldesc',
  10         #'link': ???,
  11         #'language': ???,
  12         #author_email
  13         #author_name
  14         #author_link
  15         #subtitle
  16         #categories
  17         #feed_url
  18         #feed_copyright
  19         'id': 'prodid',
  20         'ttl': 'x-published-ttl'
  21 }
  22
  23
  24 ITEM_ICAL_MAP = {
  25         'title': 'summary',
  26         'description': 'description',
  27         'link': 'url',
  28         # author_email, author_name, and author_link need special handling. Consider them the
  29         # 'organizer' of the event <http://tools.ietf.org/html/rfc5545#section-3.8.4.3> and
  30         # construct something based on that.
  31         'pubdate': 'created',
  32         'last_modified': 'last-modified',
  33         #'comments' require special handling as well <http://tools.ietf.org/html/rfc5545#section-3.8.1.4>
  34         'unique_id': 'uid',
  35         'enclosure': 'attach', # does this need special handling?
  36         'categories': 'categories', # does this need special handling?
  37         # ttl is ignored.
  38         'start': 'dtstart',
  39         'end': 'dtend',
  40 }
  41
  42
  43 class ICalendarFeed(SyndicationFeed):
  44         mime_type = 'text/calendar'
  45
  46         def add_item(self, *args, **kwargs):
  47                 for kwarg in ['start', 'end', 'last_modified', 'location']:
  48                         kwargs.setdefault(kwarg, None)
  49                 super(ICalendarFeed, self).add_item(*args, **kwargs)
  50
  51         def write(self, outfile, encoding):
  52                 # TODO: Use encoding... how? Just convert all values when setting them should work...
  53                 cal = vobject.iCalendar()
  54
  55                 # IE/Outlook needs this. See
  56                 # <http://blog.thescoop.org/archives/2007/07/31/django-ical-and-vobject/>
  57                 cal.add('method').value = 'PUBLISH'
  58
  59                 for key, val in self.feed.items():
  60                         if key in FEED_ICAL_MAP and val:
  61                                 cal.add(FEED_ICAL_MAP[key]).value = val
  62
  63                 for item in self.items:
  64                         # TODO: handle multiple types of events.
  65                         event = cal.add('vevent')
  66                         for key, val in item.items():
  67                                 #TODO: handle the non-standard items like comments and author.
  68                                 if key in ITEM_ICAL_MAP and val:
  69                                         event.add(ITEM_ICAL_MAP[key]).value = val
  70
  71                 cal.serialize(outfile)
  72
  73                 # Some special handling for HttpResponses. See link above.
  74                 if isinstance(outfile, HttpResponse):
  75                         filename = self.feed.get('filename', 'filename.ics')
  76                         outfile['Filename'] = filename
  77                         outfile['Content-Disposition'] = 'attachment; filename=%s' % filename