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from django.conf import settings
from django.contrib.sites.models import get_current_site
from django.core.exceptions import ImproperlyConfigured, ObjectDoesNotExist
from django.http import HttpResponse, Http404
from django.template import loader, TemplateDoesNotExist, RequestContext
from django.utils import feedgenerator, tzinfo
from django.utils.encoding import force_unicode, iri_to_uri, smart_unicode
from django.utils.html import escape
from django.utils.timezone import is_naive
def add_domain(domain, url, secure=False):
protocol = 'https' if secure else 'http'
if url.startswith('//'):
# Support network-path reference (see #16753) - RSS requires a protocol
url = '%s:%s' % (protocol, url)
elif not (url.startswith('http://')
or url.startswith('https://')
or url.startswith('mailto:')):
# 'url' must already be ASCII and URL-quoted, so no need for encoding
# conversions here.
url = iri_to_uri(u'%s://%s%s' % (protocol, domain, url))
return url
class FeedDoesNotExist(ObjectDoesNotExist):
pass
class Feed(object):
feed_type = feedgenerator.DefaultFeed
title_template = None
description_template = None
def __call__(self, request, *args, **kwargs):
try:
obj = self.get_object(request, *args, **kwargs)
except ObjectDoesNotExist:
raise Http404('Feed object does not exist.')
feedgen = self.get_feed(obj, request)
response = HttpResponse(content_type=feedgen.mime_type)
feedgen.write(response, 'utf-8')
return response
def item_title(self, item):
# Titles should be double escaped by default (see #6533)
return escape(force_unicode(item))
def item_description(self, item):
return force_unicode(item)
def item_link(self, item):
try:
return item.get_absolute_url()
except AttributeError:
raise ImproperlyConfigured('Give your %s class a get_absolute_url() method, or define an item_link() method in your Feed class.' % item.__class__.__name__)
def __get_dynamic_attr(self, attname, obj, default=None):
try:
attr = getattr(self, attname)
except AttributeError:
return default
if callable(attr):
# Check func_code.co_argcount rather than try/excepting the
# function and catching the TypeError, because something inside
# the function may raise the TypeError. This technique is more
# accurate.
if hasattr(attr, 'func_code'):
argcount = attr.func_code.co_argcount
else:
argcount = attr.__call__.func_code.co_argcount
if argcount == 2: # one argument is 'self'
return attr(obj)
else:
return attr()
return attr
def feed_extra_kwargs(self, obj):
"""
Returns an extra keyword arguments dictionary that is used when
initializing the feed generator.
"""
return {}
def item_extra_kwargs(self, item):
"""
Returns an extra keyword arguments dictionary that is used with
the `add_item` call of the feed generator.
"""
return {}
def get_object(self, request, *args, **kwargs):
return None
def get_feed(self, obj, request):
"""
Returns a feedgenerator.DefaultFeed object, fully populated, for
this feed. Raises FeedDoesNotExist for invalid parameters.
"""
current_site = get_current_site(request)
link = self.__get_dynamic_attr('link', obj)
link = add_domain(current_site.domain, link, request.is_secure())
feed = self.feed_type(
title = self.__get_dynamic_attr('title', obj),
subtitle = self.__get_dynamic_attr('subtitle', obj),
link = link,
description = self.__get_dynamic_attr('description', obj),
language = settings.LANGUAGE_CODE.decode(),
feed_url = add_domain(
current_site.domain,
self.__get_dynamic_attr('feed_url', obj) or request.path,
request.is_secure(),
),
author_name = self.__get_dynamic_attr('author_name', obj),
author_link = self.__get_dynamic_attr('author_link', obj),
author_email = self.__get_dynamic_attr('author_email', obj),
categories = self.__get_dynamic_attr('categories', obj),
feed_copyright = self.__get_dynamic_attr('feed_copyright', obj),
feed_guid = self.__get_dynamic_attr('feed_guid', obj),
ttl = self.__get_dynamic_attr('ttl', obj),
**self.feed_extra_kwargs(obj)
)
title_tmp = None
if self.title_template is not None:
try:
title_tmp = loader.get_template(self.title_template)
except TemplateDoesNotExist:
pass
description_tmp = None
if self.description_template is not None:
try:
description_tmp = loader.get_template(self.description_template)
except TemplateDoesNotExist:
pass
for item in self.__get_dynamic_attr('items', obj):
if title_tmp is not None:
title = title_tmp.render(RequestContext(request, {'obj': item, 'site': current_site}))
else:
title = self.__get_dynamic_attr('item_title', item)
if description_tmp is not None:
description = description_tmp.render(RequestContext(request, {'obj': item, 'site': current_site}))
else:
description = self.__get_dynamic_attr('item_description', item)
link = add_domain(
current_site.domain,
self.__get_dynamic_attr('item_link', item),
request.is_secure(),
)
enc = None
enc_url = self.__get_dynamic_attr('item_enclosure_url', item)
if enc_url:
enc = feedgenerator.Enclosure(
url = smart_unicode(enc_url),
length = smart_unicode(self.__get_dynamic_attr('item_enclosure_length', item)),
mime_type = smart_unicode(self.__get_dynamic_attr('item_enclosure_mime_type', item))
)
author_name = self.__get_dynamic_attr('item_author_name', item)
if author_name is not None:
author_email = self.__get_dynamic_attr('item_author_email', item)
author_link = self.__get_dynamic_attr('item_author_link', item)
else:
author_email = author_link = None
pubdate = self.__get_dynamic_attr('item_pubdate', item)
if pubdate and is_naive(pubdate):
ltz = tzinfo.LocalTimezone(pubdate)
pubdate = pubdate.replace(tzinfo=ltz)
feed.add_item(
title = title,
link = link,
description = description,
unique_id = self.__get_dynamic_attr('item_guid', item, link),
enclosure = enc,
pubdate = pubdate,
author_name = author_name,
author_email = author_email,
author_link = author_link,
categories = self.__get_dynamic_attr('item_categories', item),
item_copyright = self.__get_dynamic_attr('item_copyright', item),
**self.item_extra_kwargs(item)
)
return feed
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