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# Copyright (c) 2009-2010, Michael Gorven, Stefano Rivera
# Released under terms of the MIT/X/Expat Licence. See COPYING for details.
import re
from datetime import datetime
import logging
from urllib2 import URLError
from urlparse import urljoin
import feedparser
from html2text import html2text_file
from ibid.config import IntOption
from ibid.db import IbidUnicode, IbidUnicodeText, Integer, DateTime, \
Table, Column, ForeignKey, Base, VersionedSchema
from ibid.plugins import Processor, match, authorise, periodic
from ibid.utils import cacheable_download, human_join
from ibid.utils.html import get_html_parse_tree
features = {'feeds': {
'description': u'Displays articles from RSS and Atom feeds',
'categories': ('lookup', 'web',),
}}
log = logging.getLogger('plugins.feeds')
class Feed(Base):
__table__ = Table('feeds', Base.metadata,
Column('id', Integer, primary_key=True),
Column('name', IbidUnicode(32, case_insensitive=True),
unique=True, nullable=False, index=True),
Column('url', IbidUnicodeText, nullable=False),
Column('identity_id', Integer, ForeignKey('identities.id'),
nullable=False, index=True),
Column('time', DateTime, nullable=False),
Column('source', IbidUnicode(32, case_insensitive=True), index=True),
Column('target', IbidUnicode(32, case_insensitive=True), index=True),
useexisting=True)
class FeedSchema(VersionedSchema):
def upgrade_1_to_2(self):
self.add_index(self.table.c.name)
self.add_index(self.table.c.identity_id)
def upgrade_2_to_3(self):
from ibid.db import IbidUnicode, Column
self.add_column(Column('source', IbidUnicode(32), index=True))
self.add_column(Column('target', IbidUnicode(32), index=True))
def upgrade_3_to_4(self):
self.drop_index(self.table.c.name)
self.drop_index(self.table.c.source)
self.drop_index(self.table.c.target)
self.alter_column(Column('name',
IbidUnicode(32, case_insensitive=True),
unique=True, nullable=False, index=True),
force_rebuild=True)
self.alter_column(Column('url', IbidUnicodeText, nullable=False),
force_rebuild=True)
self.alter_column(Column('source',
IbidUnicode(32, case_insensitive=True),
index=True), force_rebuild=True)
self.alter_column(Column('target',
IbidUnicode(32, case_insensitive=True),
index=True), force_rebuild=True)
self.add_index(self.table.c.name)
self.add_index(self.table.c.source)
self.add_index(self.table.c.target)
__table__.versioned_schema = FeedSchema(__table__, 4)
feed = None
entries = None
def __init__(self, name, url, identity_id, source=None, target=None):
self.name = name
self.url = url
self.identity_id = identity_id
self.source = source
self.target = target
self.time = datetime.utcnow()
self.update()
def update(self, max_age=None):
headers = {}
if max_age:
headers['Cache-Control'] = 'max-age=%i' % max_age
feedfile = cacheable_download(self.url, "feeds/%s-%i.xml" % (
re.sub(r'\W+', '_', self.name), self.identity_id), headers)
self.feed = feedparser.parse(feedfile)
self.entries = self.feed['entries']
def __unicode__(self):
if self.source is not None and self.target is not None:
return u'%s (Notify %s on %s)' % (
self.name, self.target, self.source)
else:
return self.name
class Manage(Processor):
usage = u"""
add feed <url> as <name>
remove <name> feed
list feeds
poll <name> feed notify <channel> on <source>
stop polling <name> feed
"""
feature = ('feeds',)
permission = u'feeds'
@match(r'^add\s+feed\s+(.+?)\s+as\s+(.+?)$')
@authorise()
def add(self, event, url, name):
feed = event.session.query(Feed).filter_by(name=name).first()
if feed:
event.addresponse(u"I already have the %s feed", name)
return
valid = bool(feedparser.parse(url)["version"])
if not valid:
try:
soup = get_html_parse_tree(url)
for alternate in soup.findAll('link', {'rel': 'alternate',
'type': re.compile(r'^application/(atom|rss)\+xml$'),
'href': re.compile(r'.+')}):
newurl = urljoin(url, alternate["href"])
valid = bool(feedparser.parse(newurl)["version"])
if valid:
url = newurl
break
except:
pass
if not valid:
event.addresponse(u'Sorry, I could not add the %(name)s feed. '
u'%(url)s is not a valid feed', {
'name': name,
'url': url,
})
return
feed = Feed(unicode(name), unicode(url), event.identity)
event.session.add(feed)
event.session.commit()
event.addresponse(True)
log.info(u"Added feed '%s' by %s/%s (%s): %s (Found %s entries)",
name, event.account, event.identity,
event.sender['connection'], url, len(feed.entries))
@match(r'^(?:list\s+)?feeds$')
def list(self, event):
feeds = event.session.query(Feed).all()
if feeds:
event.addresponse(u'I know about: %s', human_join(sorted([
unicode(feed) for feed in feeds])))
else:
event.addresponse(u"I don't know about any feeds")
@match(r'^remove\s+(.+?)\s+feed$')
@authorise()
def remove(self, event, name):
feed = event.session.query(Feed).filter_by(name=name).first()
if not feed:
event.addresponse(u"I don't have the %s feed anyway", name)
else:
event.session.delete(feed)
event.session.commit()
log.info(u"Deleted feed '%s' by %s/%s (%s): %s", name,
event.account, event.identity,
event.sender['connection'], feed.url)
event.addresponse(True)
@match(r'^(?:stop|don\'t)\s+poll(?:ing)?\s(.+)\s+feed$')
@authorise()
def no_poll(self, event, name):
feed = event.session.query(Feed).filter_by(name=name).first()
if not feed:
event.addresponse(u"I don't have the %s feed anyway", name)
else:
feed.source = None
feed.target = None
event.session.commit()
log.info(u"Disabled polling on feed '%s' by %s/%s (%s)",
name, event.account, event.identity,
event.sender['connection'])
event.addresponse(True)
@match(r'^poll\s(.+)\s+feed\s+(?:to|notify)\s+(.+)\s+on\s+(.+)$')
@authorise(fallthrough=False)
def enable_poll(self, event, name, target, source):
feed = event.session.query(Feed).filter_by(name=name).first()
if not feed:
event.addresponse(u"I don't have the %s feed anyway", name)
else:
feed.source = source
feed.target = target
event.session.commit()
log.info(u"Enabled polling on feed '%s' to %s on %s by %s/%s (%s)",
name, target, source, event.account, event.identity,
event.sender['connection'])
event.addresponse(True)
class Retrieve(Processor):
usage = u"""latest [ <count> ] articles from <name> [ starting at <number> ]
article ( <number> | /<pattern>/ ) from <name>"""
feature = ('feeds',)
interval = IntOption('interval', 'Feed Poll interval (in seconds)', 300)
@match(r'^(?:latest|last)\s+(?:(\d+)\s+)?articles\s+from\s+(.+?)'
r'(?:\s+start(?:ing)?\s+(?:at\s+|from\s+)?(\d+))?$')
def list(self, event, number, name, start):
number = number and int(number) or 10
start = start and int(start) or 0
feed = event.session.query(Feed).filter_by(name=name).first()
if not feed:
event.addresponse(u"I don't know about the %s feed", name)
return
feed.update()
if not feed.entries:
event.addresponse(u"I can't find any articles in that feed")
return
articles = feed.entries[start:number+start]
articles = [u'%s: "%s"' % (feed.entries.index(entry) + 1,
html2text_file(entry.title, None).strip())
for entry in articles]
event.addresponse(u', '.join(articles))
@match(r'^article\s+(?:(\d+)|/(.+?)/)\s+from\s+(.+?)$')
def article(self, event, number, pattern, name):
feed = event.session.query(Feed).filter_by(name=name).first()
if not feed:
event.addresponse(u"I don't know about the %s feed", name)
return
feed.update()
if not feed.entries:
event.addresponse(u"I can't access that feed")
return
article = None
if number:
if int(number) > len(feed.entries) or 1 > int(number):
event.addresponse(u"That's old news dude")
return
article = feed.entries[int(number) - 1]
else:
pattern = re.compile(pattern, re.I)
for entry in feed.entries:
if pattern.search(entry.title):
article = entry
break
if not article:
event.addresponse(u'Are you making up news again?')
return
if 'summary' in article:
summary = html2text_file(article.summary, None)
else:
if article.content[0].type in \
('application/xhtml+xml', 'text/html'):
summary = html2text_file(article.content[0].value, None)
else:
summary = article.content[0].value
event.addresponse(u'"%(title)s" %(link)s : %(summary)s', {
'title': html2text_file(article.title, None).strip(),
'link': article.link,
'summary': summary,
})
last_seen = {}
@periodic(config_key='interval')
def poll(self, event):
feeds = event.session.query(Feed) \
.filter(Feed.source != None) \
.filter(Feed.target != None).all()
for feed in feeds:
try:
feed.update(max_age=self.interval)
except Exception, e:
if isinstance(e, URLError):
log.warning(u'Exception "%s" occured while polling '
u'feed %s from %s', e, feed, feed.url)
else:
log.exception(u'Exception "%s" occured while polling '
u'feed %s from %s', e, feed, feed.url)
continue
if not feed.entries:
continue
if feed.name not in self.last_seen:
seen = {}
for entry in feed.entries:
id = entry.get('id', entry.title)
seen[id] = entry.updated_parsed
self.last_seen[feed.name] = seen
continue
old_seen = self.last_seen[feed.name]
seen = {}
for entry in reversed(feed.entries):
id = entry.get('id', entry.title)
seen[id] = entry.updated_parsed
if entry.updated_parsed != old_seen.get(id):
event.addresponse(
u"%(status)s item in %(feed)s: %(title)s", {
'status': id in old_seen and u'Updated' or u'New',
'feed': feed.name,
'title': entry.title,
},
source=feed.source, target=feed.target, adress=False)
self.last_seen[feed.name] = seen
# vi: set et sta sw=4 ts=4:
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