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# -*- coding: utf-8 -*-
''' Atom (rfc 4287) feed parser, used to read data from atom-over-pubsub transports
and services. Very simple. Actually implements only atom:entry. Implement more features
if you need. '''
# suggestion: rewrite functions that return dates to return standard python time tuples,
# exteneded to contain timezone
import xmpp
import time
class PersonConstruct(xmpp.Node, object):
''' Not used for now, as we don't need authors/contributors in pubsub.com feeds.
They rarely exist there. '''
def __init__(self, node):
''' Create person construct from node. '''
xmpp.Node.__init__(self, node=node)
def get_name(self):
return self.getTagData('name')
name = property(get_name, None, None,
'''Conveys a human-readable name for the person. Should not be None,
although some badly generated atom feeds don't put anything here
(this is non-standard behavior, still pubsub.com sometimes does that.)''')
def get_uri(self):
return self.getTagData('uri')
uri = property(get_uri, None, None,
'''Conveys an IRI associated with the person. Might be None when not set.''')
def get_email(self):
return self.getTagData('email')
email = property(get_email, None, None,
'''Conveys an e-mail address associated with the person. Might be None when
not set.''')
class Entry(xmpp.Node, object):
def __init__(self, node=None):
''' Create new atom entry object. '''
xmpp.Node.__init__(self, 'entry', node=node)
def __repr__(self):
return '<Atom:Entry object of id="%r">' % self.id
class OldEntry(xmpp.Node, object):
''' Parser for feeds from pubsub.com. They use old Atom 0.3 format with
their extensions. '''
def __init__(self, node=None):
''' Create new Atom 0.3 entry object. '''
xmpp.Node.__init__(self, 'entry', node=node)
def __repr__(self):
return '<Atom0.3:Entry object of id="%r">' % self.id
def get_feed_title(self):
''' Returns title of feed, where the entry was created. The result is the feed name
concatenated with source-feed title. '''
if self.parent is not None:
main_feed = self.parent.getTagData('title')
else:
main_feed = None
if self.getTag('feed') is not None:
source_feed = self.getTag('feed').getTagData('title')
else:
source_feed = None
if main_feed is not None and source_feed is not None:
return u'%s: %s' % (main_feed, source_feed)
elif main_feed is not None:
return main_feed
elif source_feed is not None:
return source_feed
else:
return u''
feed_title = property(get_feed_title, None, None,
''' Title of feed. It is built from entry''s original feed title and title of feed
which delivered this entry. ''')
def get_feed_link(self):
''' Get source link '''
try:
return self.getTag('feed').getTags('link',{'rel':'alternate'})[1].getData()
except:
return None
feed_link = property(get_feed_link, None, None,
''' Link to main webpage of the feed. ''')
def get_title(self):
''' Get an entry's title. '''
return self.getTagData('title')
title = property(get_title, None, None,
''' Entry's title. ''')
def get_uri(self):
''' Get the uri the entry points to (entry's first link element with rel='alternate'
or without rel attribute). '''
for element in self.getTags('link'):
if element.attrs.has_key('rel') and element.attrs['rel']<>'alternate': continue
try:
return element.attrs['href']
except AttributeError:
pass
return None
uri = property(get_uri, None, None,
''' URI that is pointed by the entry. ''')
def get_updated(self):
''' Get the time the entry was updated last time. This should be standarized,
but pubsub.com sends it in human-readable format. We won't try to parse it.
(Atom 0.3 uses the word «modified» for that).
If there's no time given in the entry, we try with <published>
and <issued> elements. '''
for name in ('updated', 'modified', 'published', 'issued'):
date = self.getTagData(name)
if date is not None: break
if date is None:
# it is not in the standard format
return time.asctime()
return date
updated = property(get_updated, None, None,
''' Last significant modification time. ''')
feed_tagline = u''
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