217 lines
8.7 KiB
Python
217 lines
8.7 KiB
Python
from __future__ import unicode_literals
|
|
|
|
from calendar import timegm
|
|
|
|
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_text, iri_to_uri, smart_text
|
|
from django.utils.html import escape
|
|
from django.utils.http import http_date
|
|
from django.utils import six
|
|
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 = iri_to_uri('%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)
|
|
if hasattr(self, 'item_pubdate') or hasattr(self, 'item_updateddate'):
|
|
# if item_pubdate or item_updateddate is defined for the feed, set
|
|
# header so as ConditionalGetMiddleware is able to send 304 NOT MODIFIED
|
|
response['Last-Modified'] = http_date(
|
|
timegm(feedgen.latest_post_date().utctimetuple()))
|
|
feedgen.write(response, 'utf-8')
|
|
return response
|
|
|
|
def item_title(self, item):
|
|
# Titles should be double escaped by default (see #6533)
|
|
return escape(force_text(item))
|
|
|
|
def item_description(self, item):
|
|
return force_text(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 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.
|
|
try:
|
|
code = six.get_function_code(attr)
|
|
except AttributeError:
|
|
code = six.get_function_code(attr.__call__)
|
|
if code.co_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_context_data(self, **kwargs):
|
|
"""
|
|
Returns a dictionary to use as extra context if either
|
|
``self.description_template`` or ``self.item_template`` are used.
|
|
|
|
Default implementation preserves the old behavior
|
|
of using {'obj': item, 'site': current_site} as the context.
|
|
"""
|
|
return {'obj': kwargs.get('item'), 'site': kwargs.get('site')}
|
|
|
|
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,
|
|
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):
|
|
context = self.get_context_data(item=item, site=current_site,
|
|
obj=obj, request=request)
|
|
if title_tmp is not None:
|
|
title = title_tmp.render(RequestContext(request, context))
|
|
else:
|
|
title = self.__get_dynamic_attr('item_title', item)
|
|
if description_tmp is not None:
|
|
description = description_tmp.render(RequestContext(request, context))
|
|
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_text(enc_url),
|
|
length = smart_text(self.__get_dynamic_attr('item_enclosure_length', item)),
|
|
mime_type = smart_text(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)
|
|
|
|
updateddate = self.__get_dynamic_attr('item_updateddate', item)
|
|
if updateddate and is_naive(updateddate):
|
|
ltz = tzinfo.LocalTimezone(updateddate)
|
|
updateddate = updateddate.replace(tzinfo=ltz)
|
|
|
|
feed.add_item(
|
|
title = title,
|
|
link = link,
|
|
description = description,
|
|
unique_id = self.__get_dynamic_attr('item_guid', item, link),
|
|
unique_id_is_permalink = self.__get_dynamic_attr(
|
|
'item_guid_is_permalink', item),
|
|
enclosure = enc,
|
|
pubdate = pubdate,
|
|
updateddate = updateddate,
|
|
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
|