390 lines
15 KiB
Python
390 lines
15 KiB
Python
"""
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Syndication feed generation library -- used for generating RSS, etc.
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Sample usage:
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>>> from django.utils import feedgenerator
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>>> feed = feedgenerator.Rss201rev2Feed(
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... title="Poynter E-Media Tidbits",
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... link="http://www.poynter.org/column.asp?id=31",
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... description="A group Weblog by the sharpest minds in online media/journalism/publishing.",
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... language="en",
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... )
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>>> feed.add_item(
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... title="Hello",
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... link="http://www.holovaty.com/test/",
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... description="Testing."
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... )
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>>> with open('test.rss', 'w') as fp:
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... feed.write(fp, 'utf-8')
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For definitions of the different versions of RSS, see:
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http://web.archive.org/web/20110718035220/http://diveintomark.org/archives/2004/02/04/incompatible-rss
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"""
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from __future__ import unicode_literals
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import datetime
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try:
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from urllib.parse import urlparse
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except ImportError: # Python 2
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from urlparse import urlparse
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from django.utils.xmlutils import SimplerXMLGenerator
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from django.utils.encoding import force_text, iri_to_uri
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from django.utils import datetime_safe
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from django.utils import six
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from django.utils.six import StringIO
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from django.utils.timezone import is_aware
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def rfc2822_date(date):
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# We can't use strftime() because it produces locale-dependant results, so
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# we have to map english month and day names manually
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months = ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec',)
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days = ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun')
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# Support datetime objects older than 1900
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date = datetime_safe.new_datetime(date)
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# We do this ourselves to be timezone aware, email.Utils is not tz aware.
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dow = days[date.weekday()]
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month = months[date.month - 1]
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time_str = date.strftime('%s, %%d %s %%Y %%H:%%M:%%S ' % (dow, month))
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if not six.PY3: # strftime returns a byte string in Python 2
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time_str = time_str.decode('utf-8')
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if is_aware(date):
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offset = date.tzinfo.utcoffset(date)
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timezone = (offset.days * 24 * 60) + (offset.seconds // 60)
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hour, minute = divmod(timezone, 60)
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return time_str + '%+03d%02d' % (hour, minute)
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else:
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return time_str + '-0000'
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def rfc3339_date(date):
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# Support datetime objects older than 1900
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date = datetime_safe.new_datetime(date)
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time_str = date.strftime('%Y-%m-%dT%H:%M:%S')
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if not six.PY3: # strftime returns a byte string in Python 2
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time_str = time_str.decode('utf-8')
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if is_aware(date):
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offset = date.tzinfo.utcoffset(date)
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timezone = (offset.days * 24 * 60) + (offset.seconds // 60)
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hour, minute = divmod(timezone, 60)
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return time_str + '%+03d:%02d' % (hour, minute)
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else:
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return time_str + 'Z'
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def get_tag_uri(url, date):
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"""
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Creates a TagURI.
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See http://web.archive.org/web/20110514113830/http://diveintomark.org/archives/2004/05/28/howto-atom-id
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"""
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bits = urlparse(url)
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d = ''
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if date is not None:
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d = ',%s' % datetime_safe.new_datetime(date).strftime('%Y-%m-%d')
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return 'tag:%s%s:%s/%s' % (bits.hostname, d, bits.path, bits.fragment)
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class SyndicationFeed(object):
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"Base class for all syndication feeds. Subclasses should provide write()"
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def __init__(self, title, link, description, language=None, author_email=None,
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author_name=None, author_link=None, subtitle=None, categories=None,
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feed_url=None, feed_copyright=None, feed_guid=None, ttl=None, **kwargs):
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to_unicode = lambda s: force_text(s, strings_only=True)
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if categories:
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categories = [force_text(c) for c in categories]
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if ttl is not None:
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# Force ints to unicode
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ttl = force_text(ttl)
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self.feed = {
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'title': to_unicode(title),
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'link': iri_to_uri(link),
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'description': to_unicode(description),
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'language': to_unicode(language),
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'author_email': to_unicode(author_email),
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'author_name': to_unicode(author_name),
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'author_link': iri_to_uri(author_link),
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'subtitle': to_unicode(subtitle),
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'categories': categories or (),
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'feed_url': iri_to_uri(feed_url),
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'feed_copyright': to_unicode(feed_copyright),
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'id': feed_guid or link,
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'ttl': ttl,
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}
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self.feed.update(kwargs)
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self.items = []
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def add_item(self, title, link, description, author_email=None,
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author_name=None, author_link=None, pubdate=None, comments=None,
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unique_id=None, enclosure=None, categories=(), item_copyright=None,
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ttl=None, **kwargs):
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"""
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Adds an item to the feed. All args are expected to be Python Unicode
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objects except pubdate, which is a datetime.datetime object, and
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enclosure, which is an instance of the Enclosure class.
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"""
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to_unicode = lambda s: force_text(s, strings_only=True)
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if categories:
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categories = [to_unicode(c) for c in categories]
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if ttl is not None:
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# Force ints to unicode
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ttl = force_text(ttl)
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item = {
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'title': to_unicode(title),
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'link': iri_to_uri(link),
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'description': to_unicode(description),
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'author_email': to_unicode(author_email),
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'author_name': to_unicode(author_name),
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'author_link': iri_to_uri(author_link),
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'pubdate': pubdate,
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'comments': to_unicode(comments),
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'unique_id': to_unicode(unique_id),
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'enclosure': enclosure,
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'categories': categories or (),
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'item_copyright': to_unicode(item_copyright),
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'ttl': ttl,
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}
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item.update(kwargs)
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self.items.append(item)
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def num_items(self):
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return len(self.items)
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def root_attributes(self):
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"""
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Return extra attributes to place on the root (i.e. feed/channel) element.
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Called from write().
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"""
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return {}
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def add_root_elements(self, handler):
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"""
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Add elements in the root (i.e. feed/channel) element. Called
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from write().
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"""
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pass
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def item_attributes(self, item):
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"""
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Return extra attributes to place on each item (i.e. item/entry) element.
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"""
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return {}
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def add_item_elements(self, handler, item):
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"""
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Add elements on each item (i.e. item/entry) element.
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"""
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pass
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def write(self, outfile, encoding):
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"""
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Outputs the feed in the given encoding to outfile, which is a file-like
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object. Subclasses should override this.
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"""
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raise NotImplementedError
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def writeString(self, encoding):
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"""
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Returns the feed in the given encoding as a string.
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"""
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s = StringIO()
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self.write(s, encoding)
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return s.getvalue()
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def latest_post_date(self):
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"""
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Returns the latest item's pubdate. If none of them have a pubdate,
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this returns the current date/time.
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"""
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updates = [i['pubdate'] for i in self.items if i['pubdate'] is not None]
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if len(updates) > 0:
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updates.sort()
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return updates[-1]
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else:
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return datetime.datetime.now()
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class Enclosure(object):
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"Represents an RSS enclosure"
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def __init__(self, url, length, mime_type):
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"All args are expected to be Python Unicode objects"
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self.length, self.mime_type = length, mime_type
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self.url = iri_to_uri(url)
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class RssFeed(SyndicationFeed):
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mime_type = 'application/rss+xml; charset=utf-8'
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def write(self, outfile, encoding):
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handler = SimplerXMLGenerator(outfile, encoding)
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handler.startDocument()
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handler.startElement("rss", self.rss_attributes())
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handler.startElement("channel", self.root_attributes())
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self.add_root_elements(handler)
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self.write_items(handler)
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self.endChannelElement(handler)
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handler.endElement("rss")
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def rss_attributes(self):
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return {"version": self._version,
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"xmlns:atom": "http://www.w3.org/2005/Atom"}
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def write_items(self, handler):
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for item in self.items:
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handler.startElement('item', self.item_attributes(item))
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self.add_item_elements(handler, item)
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handler.endElement("item")
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def add_root_elements(self, handler):
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handler.addQuickElement("title", self.feed['title'])
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handler.addQuickElement("link", self.feed['link'])
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handler.addQuickElement("description", self.feed['description'])
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if self.feed['feed_url'] is not None:
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handler.addQuickElement("atom:link", None,
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{"rel": "self", "href": self.feed['feed_url']})
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if self.feed['language'] is not None:
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handler.addQuickElement("language", self.feed['language'])
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for cat in self.feed['categories']:
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handler.addQuickElement("category", cat)
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if self.feed['feed_copyright'] is not None:
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handler.addQuickElement("copyright", self.feed['feed_copyright'])
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handler.addQuickElement("lastBuildDate", rfc2822_date(self.latest_post_date()))
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if self.feed['ttl'] is not None:
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handler.addQuickElement("ttl", self.feed['ttl'])
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def endChannelElement(self, handler):
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handler.endElement("channel")
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class RssUserland091Feed(RssFeed):
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_version = "0.91"
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def add_item_elements(self, handler, item):
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handler.addQuickElement("title", item['title'])
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handler.addQuickElement("link", item['link'])
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if item['description'] is not None:
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handler.addQuickElement("description", item['description'])
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class Rss201rev2Feed(RssFeed):
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# Spec: http://blogs.law.harvard.edu/tech/rss
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_version = "2.0"
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def add_item_elements(self, handler, item):
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handler.addQuickElement("title", item['title'])
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handler.addQuickElement("link", item['link'])
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if item['description'] is not None:
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handler.addQuickElement("description", item['description'])
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# Author information.
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if item["author_name"] and item["author_email"]:
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handler.addQuickElement("author", "%s (%s)" % \
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(item['author_email'], item['author_name']))
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elif item["author_email"]:
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handler.addQuickElement("author", item["author_email"])
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elif item["author_name"]:
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handler.addQuickElement("dc:creator", item["author_name"], {"xmlns:dc": "http://purl.org/dc/elements/1.1/"})
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if item['pubdate'] is not None:
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handler.addQuickElement("pubDate", rfc2822_date(item['pubdate']))
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if item['comments'] is not None:
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handler.addQuickElement("comments", item['comments'])
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if item['unique_id'] is not None:
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handler.addQuickElement("guid", item['unique_id'])
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if item['ttl'] is not None:
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handler.addQuickElement("ttl", item['ttl'])
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# Enclosure.
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if item['enclosure'] is not None:
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handler.addQuickElement("enclosure", '',
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{"url": item['enclosure'].url, "length": item['enclosure'].length,
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"type": item['enclosure'].mime_type})
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# Categories.
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for cat in item['categories']:
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handler.addQuickElement("category", cat)
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class Atom1Feed(SyndicationFeed):
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# Spec: http://atompub.org/2005/07/11/draft-ietf-atompub-format-10.html
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mime_type = 'application/atom+xml; charset=utf-8'
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ns = "http://www.w3.org/2005/Atom"
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def write(self, outfile, encoding):
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handler = SimplerXMLGenerator(outfile, encoding)
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handler.startDocument()
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handler.startElement('feed', self.root_attributes())
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self.add_root_elements(handler)
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self.write_items(handler)
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handler.endElement("feed")
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def root_attributes(self):
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if self.feed['language'] is not None:
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return {"xmlns": self.ns, "xml:lang": self.feed['language']}
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else:
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return {"xmlns": self.ns}
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def add_root_elements(self, handler):
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handler.addQuickElement("title", self.feed['title'])
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handler.addQuickElement("link", "", {"rel": "alternate", "href": self.feed['link']})
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if self.feed['feed_url'] is not None:
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handler.addQuickElement("link", "", {"rel": "self", "href": self.feed['feed_url']})
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handler.addQuickElement("id", self.feed['id'])
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handler.addQuickElement("updated", rfc3339_date(self.latest_post_date()))
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if self.feed['author_name'] is not None:
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handler.startElement("author", {})
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handler.addQuickElement("name", self.feed['author_name'])
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if self.feed['author_email'] is not None:
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handler.addQuickElement("email", self.feed['author_email'])
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if self.feed['author_link'] is not None:
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handler.addQuickElement("uri", self.feed['author_link'])
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handler.endElement("author")
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if self.feed['subtitle'] is not None:
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handler.addQuickElement("subtitle", self.feed['subtitle'])
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for cat in self.feed['categories']:
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handler.addQuickElement("category", "", {"term": cat})
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if self.feed['feed_copyright'] is not None:
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handler.addQuickElement("rights", self.feed['feed_copyright'])
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def write_items(self, handler):
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for item in self.items:
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handler.startElement("entry", self.item_attributes(item))
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self.add_item_elements(handler, item)
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handler.endElement("entry")
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def add_item_elements(self, handler, item):
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handler.addQuickElement("title", item['title'])
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handler.addQuickElement("link", "", {"href": item['link'], "rel": "alternate"})
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if item['pubdate'] is not None:
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handler.addQuickElement("updated", rfc3339_date(item['pubdate']))
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# Author information.
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if item['author_name'] is not None:
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handler.startElement("author", {})
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handler.addQuickElement("name", item['author_name'])
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if item['author_email'] is not None:
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handler.addQuickElement("email", item['author_email'])
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if item['author_link'] is not None:
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handler.addQuickElement("uri", item['author_link'])
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handler.endElement("author")
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# Unique ID.
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if item['unique_id'] is not None:
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unique_id = item['unique_id']
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else:
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unique_id = get_tag_uri(item['link'], item['pubdate'])
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handler.addQuickElement("id", unique_id)
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# Summary.
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if item['description'] is not None:
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handler.addQuickElement("summary", item['description'], {"type": "html"})
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# Enclosure.
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if item['enclosure'] is not None:
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handler.addQuickElement("link", '',
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{"rel": "enclosure",
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"href": item['enclosure'].url,
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"length": item['enclosure'].length,
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"type": item['enclosure'].mime_type})
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# Categories.
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for cat in item['categories']:
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handler.addQuickElement("category", "", {"term": cat})
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# Rights.
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if item['item_copyright'] is not None:
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handler.addQuickElement("rights", item['item_copyright'])
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# This isolates the decision of what the system default is, so calling code can
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# do "feedgenerator.DefaultFeed" instead of "feedgenerator.Rss201rev2Feed".
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DefaultFeed = Rss201rev2Feed
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