app/django/contrib/syndication/feeds.py
author Daniel Hans <Daniel.M.Hans@gmail.com>
Sat, 14 Nov 2009 23:27:03 +0100
changeset 3091 a48f4e860f7b
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Tasks may be deleted by pressing 'Delete' button on the edit view. An organization admin may delete a task entity, if the task is not claimed by anyone. Issue 695 fixed.
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from datetime import datetime, timedelta
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from django.core.exceptions import ImproperlyConfigured, ObjectDoesNotExist
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from django.template import 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.tzinfo import FixedOffset
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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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from django.template import RequestContext
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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 feed_extra_kwargs(self, obj):
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        """
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        Returns an extra keyword arguments dictionary that is used when
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        initializing the feed generator.
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        """
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        return {}
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    def item_extra_kwargs(self, item):
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        """
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        Returns an extra keyword arguments dictionary that is used with
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        the `add_item` call of the feed generator.
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        """
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        return {}
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    def get_object(self, bits):
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        return None
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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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            bits = url.split('/')
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        else:
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            bits = []
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        try:
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            obj = self.get_object(bits)
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        except ObjectDoesNotExist:
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            raise FeedDoesNotExist
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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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            **self.feed_extra_kwargs(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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            pubdate = self.__get_dynamic_attr('item_pubdate', item)
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            if pubdate:
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                now = datetime.now()
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                utcnow = datetime.utcnow()
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                # Must always subtract smaller time from larger time here.
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                if utcnow > now:
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                    sign = -1
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                    tzDifference = (utcnow - now)
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                else:
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                    sign = 1
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                    tzDifference = (now - utcnow)
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                # Round the timezone offset to the nearest half hour.
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                tzOffsetMinutes = sign * ((tzDifference.seconds / 60 + 15) / 30) * 30
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                tzOffset = timedelta(minutes=tzOffsetMinutes)
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                pubdate = pubdate.replace(tzinfo=FixedOffset(tzOffset))
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54
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            feed.add_item(
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                title = title_tmp.render(RequestContext(self.request, {'obj': item, 'site': current_site})),
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                link = link,
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                description = description_tmp.render(RequestContext(self.request, {'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 = pubdate,
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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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                **self.item_extra_kwargs(item)
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            )
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        return feed