contrib/penfield/utils.py

   1 from django.utils.feedgenerator import Atom1Feed, Rss201rev2Feed
   2 from django.conf.urls.defaults import url, patterns
   3 from django.contrib.sites.models import Site
   4 from django.core.urlresolvers import reverse
   5 from django.http import HttpResponse
   6 from philo.utils import paginate
   7
   8
   9 class FeedMultiViewMixin(object):
  10         """
  11         This mixin provides common methods for adding feeds to multiviews. In order to use this mixin,
  12         the multiview must define feed_title (probably as properties that return values
  13         on related objects.) feed_description may also be defined; it defaults to an empty string.
  14         """
  15         feed_suffix = 'feed'
  16         feeds_enabled = True
  17         atom_feed = Atom1Feed
  18         rss_feed = Rss201rev2Feed
  19         feed_description = ''
  20         list_var = 'objects'
  21
  22         def page_view(self, func, page):
  23                 """
  24                 Wraps an object-fetching function and renders the results as a page.
  25                 """
  26                 def inner(request, node=None, extra_context=None, **kwargs):
  27                         objects, extra_context = func(request=request, node=node, extra_context=extra_context, **kwargs)
  28
  29                         context = self.get_context()
  30                         context.update(extra_context or {})
  31
  32                         if 'page' in kwargs or 'page' in request.GET or (hasattr(self, 'per_page') and self.per_page):
  33                                 page_num = kwargs.get('page', request.GET.get('page', 1))
  34                                 paginator, paginated_page, objects = paginate(objects, self.per_page, page_num)
  35                                 context.update({'paginator': paginator, 'paginated_page': paginated_page, self.list_var: objects})
  36                         else:
  37                                 context.update({self.list_var: objects})
  38
  39                         return page.render_to_response(node, request, extra_context=context)
  40
  41                 return inner
  42
  43         def feed_view(self, func, reverse_name):
  44                 """
  45                 Wraps an object-fetching function and renders the results as a rss or atom feed.
  46                 """
  47                 def inner(request, node=None, extra_context=None, **kwargs):
  48                         objects, extra_context = func(request=request, node=node, extra_context=extra_context, **kwargs)
  49
  50                         if 'HTTP_ACCEPT' in request.META and 'rss' in request.META['HTTP_ACCEPT'] and 'atom' not in request.META['HTTP_ACCEPT']:
  51                                 feed_type = 'rss'
  52                         else:
  53                                 feed_type = 'atom'
  54
  55                         feed = self.get_feed(feed_type, request, node, kwargs, reverse_name)
  56                         current_site = Site.objects.get_current()
  57
  58                         for obj in objects:
  59                                 kwargs = {
  60                                         'link': 'http://%s/%s/%s/' % (current_site.domain, node.get_absolute_url().strip('/'), self.get_subpath(obj).strip('/'))
  61                                 }
  62                                 self.add_item(feed, obj, kwargs=kwargs)
  63
  64                         response = HttpResponse(mimetype=feed.mime_type)
  65                         feed.write(response, 'utf-8')
  66                         return response
  67
  68                 return inner
  69
  70         def get_feed(self, feed_type, request, node, kwargs, reverse_name):
  71                 title = self.feed_title
  72                 current_site = Site.objects.get_current()
  73                 link = 'http://%s/%s/%s/' % (current_site.domain, node.get_absolute_url().strip('/'), reverse(reverse_name, urlconf=self, kwargs=kwargs).strip('/'))
  74                 description = self.feed_description
  75                 if feed_type == 'rss':
  76                         return self.rss_feed(title, link, description)
  77
  78                 return self.atom_feed(title, link, description, subtitle=description)
  79
  80         def feed_patterns(self, object_fetcher, page, base_name):
  81                 feed_name = '%s_feed' % base_name
  82                 urlpatterns = patterns('',
  83                         url(r'^%s/$' % self.feed_suffix, self.feed_view(object_fetcher, feed_name), name=feed_name),
  84                         url(r'^$', self.page_view(object_fetcher, page), name=base_name)
  85                 )
  86                 return urlpatterns
  87
  88         def add_item(self, feed, obj, kwargs=None):
  89                 defaults = kwargs or {}
  90                 feed.add_item(**defaults)