135 lines
5.8 KiB
Python
135 lines
5.8 KiB
Python
from django.core.exceptions import ImproperlyConfigured, ObjectDoesNotExist
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from django.template import Context, loader, Template, TemplateDoesNotExist
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from django.contrib.sites.models import Site, RequestSite
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from django.utils import feedgenerator
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from django.utils.encoding import smart_unicode, iri_to_uri
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from django.conf import settings
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def add_domain(domain, url):
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if not (url.startswith('http://') or url.startswith('https://')):
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# 'url' must already be ASCII and URL-quoted, so no need for encoding
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# conversions here.
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url = iri_to_uri(u'http://%s%s' % (domain, url))
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return url
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class FeedDoesNotExist(ObjectDoesNotExist):
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pass
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class Feed(object):
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item_pubdate = None
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item_enclosure_url = None
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feed_type = feedgenerator.DefaultFeed
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title_template = None
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description_template = None
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def __init__(self, slug, request):
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self.slug = slug
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self.request = request
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self.feed_url = request.path
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self.title_template_name = self.title_template or ('feeds/%s_title.html' % slug)
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self.description_template_name = self.description_template or ('feeds/%s_description.html' % slug)
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def item_link(self, item):
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try:
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return item.get_absolute_url()
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except AttributeError:
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raise ImproperlyConfigured, "Give your %s class a get_absolute_url() method, or define an item_link() method in your Feed class." % item.__class__.__name__
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def __get_dynamic_attr(self, attname, obj, default=None):
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try:
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attr = getattr(self, attname)
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except AttributeError:
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return default
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if callable(attr):
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# Check func_code.co_argcount rather than try/excepting the
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# function and catching the TypeError, because something inside
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# the function may raise the TypeError. This technique is more
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# accurate.
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if hasattr(attr, 'func_code'):
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argcount = attr.func_code.co_argcount
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else:
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argcount = attr.__call__.func_code.co_argcount
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if argcount == 2: # one argument is 'self'
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return attr(obj)
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else:
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return attr()
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return attr
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def get_feed(self, url=None):
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"""
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Returns a feedgenerator.DefaultFeed object, fully populated, for
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this feed. Raises FeedDoesNotExist for invalid parameters.
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"""
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if url:
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try:
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obj = self.get_object(url.split('/'))
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except (AttributeError, ObjectDoesNotExist):
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raise FeedDoesNotExist
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else:
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obj = None
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if Site._meta.installed:
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current_site = Site.objects.get_current()
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else:
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current_site = RequestSite(self.request)
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link = self.__get_dynamic_attr('link', obj)
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link = add_domain(current_site.domain, link)
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feed = self.feed_type(
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title = self.__get_dynamic_attr('title', obj),
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subtitle = self.__get_dynamic_attr('subtitle', obj),
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link = link,
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description = self.__get_dynamic_attr('description', obj),
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language = settings.LANGUAGE_CODE.decode(),
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feed_url = add_domain(current_site.domain,
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self.__get_dynamic_attr('feed_url', obj)),
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author_name = self.__get_dynamic_attr('author_name', obj),
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author_link = self.__get_dynamic_attr('author_link', obj),
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author_email = self.__get_dynamic_attr('author_email', obj),
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categories = self.__get_dynamic_attr('categories', obj),
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feed_copyright = self.__get_dynamic_attr('feed_copyright', obj),
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feed_guid = self.__get_dynamic_attr('feed_guid', obj),
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ttl = self.__get_dynamic_attr('ttl', obj),
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)
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try:
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title_tmp = loader.get_template(self.title_template_name)
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except TemplateDoesNotExist:
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title_tmp = Template('{{ obj }}')
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try:
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description_tmp = loader.get_template(self.description_template_name)
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except TemplateDoesNotExist:
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description_tmp = Template('{{ obj }}')
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for item in self.__get_dynamic_attr('items', obj):
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link = add_domain(current_site.domain, self.__get_dynamic_attr('item_link', item))
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enc = None
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enc_url = self.__get_dynamic_attr('item_enclosure_url', item)
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if enc_url:
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enc = feedgenerator.Enclosure(
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url = smart_unicode(enc_url),
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length = smart_unicode(self.__get_dynamic_attr('item_enclosure_length', item)),
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mime_type = smart_unicode(self.__get_dynamic_attr('item_enclosure_mime_type', item))
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)
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author_name = self.__get_dynamic_attr('item_author_name', item)
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if author_name is not None:
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author_email = self.__get_dynamic_attr('item_author_email', item)
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author_link = self.__get_dynamic_attr('item_author_link', item)
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else:
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author_email = author_link = None
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feed.add_item(
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title = title_tmp.render(Context({'obj': item, 'site': current_site})),
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link = link,
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description = description_tmp.render(Context({'obj': item, 'site': current_site})),
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unique_id = self.__get_dynamic_attr('item_guid', item, link),
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enclosure = enc,
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pubdate = self.__get_dynamic_attr('item_pubdate', item),
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author_name = author_name,
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author_email = author_email,
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author_link = author_link,
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categories = self.__get_dynamic_attr('item_categories', item),
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item_copyright = self.__get_dynamic_attr('item_copyright', item),
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)
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return feed
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