Limnoria/plugins/RSS/plugin.py
2020-01-31 20:59:42 +01:00

637 lines
24 KiB
Python

###
# Copyright (c) 2002-2004, Jeremiah Fincher
# Copyright (c) 2008-2010, James McCoy
# Copyright (c) 2014, Valentin Lorentz
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions, and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###
import re
import os
import sys
import json
import time
import types
import string
import socket
import threading
import feedparser
import supybot.conf as conf
import supybot.utils as utils
import supybot.world as world
from supybot.commands import *
import supybot.utils.minisix as minisix
import supybot.ircmsgs as ircmsgs
import supybot.ircutils as ircutils
import supybot.registry as registry
import supybot.callbacks as callbacks
from supybot.i18n import PluginInternationalization, internationalizeDocstring
_ = PluginInternationalization('RSS')
if world.testing:
INIT_DELAY = 1
else:
INIT_DELAY = 10
if minisix.PY2:
from urllib2 import ProxyHandler
else:
from urllib.request import ProxyHandler
from .config import register_feed_config
def get_feedName(irc, msg, args, state):
if irc.isChannel(args[0]):
state.errorInvalid('feed name', args[0], 'must not be channel names.')
if not registry.isValidRegistryName(args[0]):
state.errorInvalid('feed name', args[0],
'Feed names must not include spaces.')
state.args.append(callbacks.canonicalName(args.pop(0)))
addConverter('feedName', get_feedName)
announced_headlines_filename = \
conf.supybot.directories.data.dirize('RSS_announced.flat')
def only_one_at_once(f):
lock = [False]
def newf(*args, **kwargs):
if lock[0]:
return
lock[0] = True
try:
f(*args, **kwargs)
finally:
lock[0] = False
return newf
def get_entry_id(entry):
# in order, try elements to use as unique identifier.
# http://validator.w3.org/feed/docs/rss2.html#hrelementsOfLtitemgt
id_elements = ('id', 'link', 'title', 'description')
for id_element in id_elements:
try:
return getattr(entry, id_element)
except AttributeError:
pass
raise ValueError('Feed entry is missing both title and description')
class InvalidFeedUrl(ValueError):
pass
class Feed:
__slots__ = ('url', 'name', 'data', 'last_update', 'entries',
'etag', 'modified', 'initial',
'lock', 'announced_entries', 'last_exception')
def __init__(self, name, url, initial,
plugin_is_loading=False, announced=None):
assert name, name
if not url:
url = name
if not utils.web.httpUrlRe.match(url):
raise InvalidFeedUrl(url)
self.name = name
self.url = url
self.initial = initial
self.data = None
# We don't want to fetch feeds right after the plugin is
# loaded (the bot could be starting, and thus already busy)
self.last_update = 0
self.entries = []
self.etag = None
self.modified = None
self.lock = threading.Lock()
self.announced_entries = announced or \
utils.structures.TruncatableSet()
self.last_exception = None
def __repr__(self):
return 'Feed(%r, %r, %r, <bool>, %r)' % \
(self.name, self.url, self.initial, self.announced_entries)
def get_command(self, plugin):
docstring = format(_("""[<number of headlines>]
Reports the titles for %s at the RSS feed %u. If
<number of headlines> is given, returns only that many headlines.
RSS feeds are only looked up every supybot.plugins.RSS.waitPeriod
seconds, which defaults to 1800 (30 minutes) since that's what most
websites prefer."""), self.name, self.url)
def f(self2, irc, msg, args):
args.insert(0, self.name)
self2.rss(irc, msg, args)
f = utils.python.changeFunctionName(f, self.name, docstring)
f = types.MethodType(f, plugin)
return f
_sort_parameters = {
'oldestFirst': (('published_parsed', 'updated_parsed'), False),
'newestFirst': (('published_parsed', 'updated_parsed'), True),
'outdatedFirst': (('updated_parsed', 'published_parsed'), False),
'updatedFirst': (('updated_parsed', 'published_parsed'), True),
}
def _sort_arguments(order):
(fields, reverse) = _sort_parameters[order]
def key(entry):
for field in fields:
if field in entry:
return entry[field]
raise KeyError('No date field in entry.')
return (key, reverse)
def sort_feed_items(items, order):
"""Return feed items, sorted according to sortFeedItems."""
if order == 'asInFeed':
return items
(key, reverse) = _sort_arguments(order)
try:
sitems = sorted(items, key=key, reverse=reverse)
except KeyError:
# feedparser normalizes required timestamp fields in ATOM and RSS
# to the "published"/"updated" fields. Feeds missing it are unsortable by date.
return items
return sitems
def load_announces_db(fd):
return dict((name, utils.structures.TruncatableSet(entries))
for (name, entries) in json.load(fd).items())
def save_announces_db(db, fd):
json.dump(dict((name, list(entries)) for (name, entries) in db), fd)
class RSS(callbacks.Plugin):
"""This plugin is useful both for announcing updates to RSS feeds in a
channel, and for retrieving the headlines of RSS feeds via command. Use
the "add" command to add feeds to this plugin, and use the "announce"
command to determine what feeds should be announced in a given channel."""
threaded = True
def __init__(self, irc):
self.__parent = super(RSS, self)
self.__parent.__init__(irc)
if world.starting:
self._init_time = time.time() # To delay loading the feeds
else:
self._init_time = 0
# Scheme: {name: url}
self.feed_names = callbacks.CanonicalNameDict()
# Scheme: {url: feed}
self.feeds = {}
if os.path.isfile(announced_headlines_filename):
with open(announced_headlines_filename) as fd:
announced = load_announces_db(fd)
else:
announced = {}
for name in self.registryValue('feeds'):
try:
url = self.registryValue(registry.join(['feeds', name]))
except registry.NonExistentRegistryEntry:
self.log.warning('%s is not a registered feed, removing.',name)
continue
try:
self.register_feed(name, url, True, True, announced.get(name, []))
except InvalidFeedUrl:
self.log.error('%s is not a valid feed, removing.', name)
continue
world.flushers.append(self._flush)
def die(self):
self._flush()
world.flushers.remove(self._flush)
self.__parent.die()
def _flush(self):
l = [(f.name, f.announced_entries) for f in self.feeds.values()]
with utils.file.AtomicFile(announced_headlines_filename, 'w',
backupDir='/dev/null') as fd:
save_announces_db(l, fd)
##################
# Feed registering
def assert_feed_does_not_exist(self, name, url=None):
if self.isCommandMethod(name):
s = format(_('I already have a command in this plugin named %s.'),
name)
raise callbacks.Error(s)
if url:
feed = self.feeds.get(url)
if feed and feed.name != feed.url:
s = format(_('I already have a feed with that URL named %s.'),
feed.name)
raise callbacks.Error(s)
def register_feed(self, name, url, initial,
plugin_is_loading, announced=None):
self.feed_names[name] = url
self.feeds[url] = Feed(name, url, initial,
plugin_is_loading, announced)
def remove_feed(self, feed):
del self.feed_names[feed.name]
del self.feeds[feed.url]
conf.supybot.plugins.RSS.feeds().remove(feed.name)
conf.supybot.plugins.RSS.feeds.unregister(feed.name)
##################
# Methods handling
def isCommandMethod(self, name):
if not self.__parent.isCommandMethod(name):
return bool(self.get_feed(name))
else:
return True
def listCommands(self):
return self.__parent.listCommands(self.feed_names.keys())
def getCommandMethod(self, command):
try:
return self.__parent.getCommandMethod(command)
except AttributeError:
return self.get_feed(command[0]).get_command(self)
def __call__(self, irc, msg):
self.__parent.__call__(irc, msg)
threading.Thread(target=self.update_feeds).start()
##################
# Status accessors
def get_feed(self, name):
return self.feeds.get(self.feed_names.get(name, name), None)
def is_expired(self, feed):
assert feed
period = self.registryValue('waitPeriod')
if feed.name != feed.url: # Named feed
specific_period = self.registryValue('feeds.%s.waitPeriod' % feed.name)
if specific_period:
period = specific_period
event_horizon = time.time() - period
return feed.last_update < event_horizon
###############
# Feed fetching
def update_feed(self, feed):
handlers = []
if utils.web.proxy():
handlers.append(ProxyHandler(
{'http': utils.force(utils.web.proxy())}))
handlers.append(ProxyHandler(
{'https': utils.force(utils.web.proxy())}))
with feed.lock:
d = feedparser.parse(feed.url, etag=feed.etag,
modified=feed.modified, handlers=handlers)
if 'status' not in d or d.status != 304: # Not modified
if 'etag' in d:
feed.etag = d.etag
if 'modified' in d:
feed.modified = d.modified
feed.data = d.feed
feed.entries = d.entries
feed.last_update = time.time()
# feedparser will store soft errors in bozo_exception and set
# the "bozo" bit to 1 on supported platforms:
# https://pythonhosted.org/feedparser/bozo.html
# If this error caused us to e.g. not get any entries at all,
# it may be helpful to show it as well.
if getattr(d, 'bozo', 0) and hasattr(d, 'bozo_exception'):
feed.last_exception = d.bozo_exception
else:
feed.last_exception = None
(initial, feed.initial) = (feed.initial, False)
self.announce_feed(feed, initial)
def update_feed_if_needed(self, feed):
if self.is_expired(feed) and \
self._init_time + INIT_DELAY < time.time():
self.update_feed(feed)
@only_one_at_once
def update_feeds(self):
announced_feeds = set()
for irc in world.ircs:
for channel in irc.state.channels:
announced_feeds |= self.registryValue('announce', channel, irc.network)
for name in announced_feeds:
feed = self.get_feed(name)
if not feed:
self.log.warning('Feed %s is announced but does not exist.',
name)
continue
self.update_feed_if_needed(feed)
def get_new_entries(self, feed):
with feed.lock:
entries = feed.entries
new_entries = [entry for entry in entries
if get_entry_id(entry) not in feed.announced_entries]
if not new_entries:
return []
feed.announced_entries |= set(get_entry_id(entry) for entry in new_entries)
# We keep a little more because we don't want to re-announce
# oldest entries if one of the newest gets removed.
feed.announced_entries.truncate(10*len(entries))
return new_entries
def announce_feed(self, feed, initial):
new_entries = self.get_new_entries(feed)
order = self.registryValue('sortFeedItems')
new_entries = sort_feed_items(new_entries, 'newestFirst')
for irc in world.ircs:
for channel in irc.state.channels:
if feed.name not in self.registryValue('announce',
channel, irc.network):
continue
if initial:
max_entries = self.registryValue(
'initialAnnounceHeadlines', channel, irc.network)
else:
max_entries = self.registryValue(
'maximumAnnounceHeadlines', channel, irc.network)
announced_entries = new_entries[0:max_entries]
announced_entries = sort_feed_items(announced_entries, order)
for entry in announced_entries:
self.announce_entry(irc, channel, feed, entry)
#################
# Entry rendering
def should_send_entry(self, network, channel, entry):
whitelist = self.registryValue('keywordWhitelist', channel, network)
blacklist = self.registryValue('keywordBlacklist', channel, network)
# fix shadowing by "from supybot.commands import *"
try:
all = __builtins__.all
any = __builtins__.any
except AttributeError:
all = __builtins__['all']
any = __builtins__['any']
title = getattr(entry, 'title', '')
description = getattr(entry, 'description', '')
if whitelist:
if all(kw not in title and kw not in description
for kw in whitelist):
return False
if blacklist:
if any(kw in title or kw in description
for kw in blacklist):
return False
return True
_normalize_entry = utils.str.multipleReplacer(
{'\r': ' ', '\n': ' ', '\x00': ''})
def format_entry(self, network, channel, feed, entry, is_announce):
key_name = 'announceFormat' if is_announce else 'format'
if feed.name in self.registryValue('feeds'):
specific_key_name = registry.join(['feeds', feed.name, key_name])
template = self.registryValue(specific_key_name,
channel, network) or \
self.registryValue(key_name, channel, network)
else:
template = self.registryValue(key_name, channel, network)
date = entry.get('published_parsed')
date = utils.str.timestamp(date)
s = string.Template(template).substitute(
entry,
feed_name=feed.name,
date=date)
return self._normalize_entry(s)
def announce_entry(self, irc, channel, feed, entry):
if self.should_send_entry(irc.network, channel, entry):
s = self.format_entry(irc.network, channel, feed, entry, True)
if self.registryValue('notice', channel, irc.network):
m = ircmsgs.notice(channel, s)
else:
m = ircmsgs.privmsg(channel, s)
irc.queueMsg(m)
##########
# Commands
@internationalizeDocstring
def add(self, irc, msg, args, name, url):
"""<name> <url>
Adds a command to this plugin that will look up the RSS feed at the
given URL.
"""
self.assert_feed_does_not_exist(name, url)
register_feed_config(name, url)
self.register_feed(name, url, True, False)
irc.replySuccess()
add = wrap(add, ['feedName', 'url'])
@internationalizeDocstring
def remove(self, irc, msg, args, name):
"""<name>
Removes the command for looking up RSS feeds at <name> from
this plugin.
"""
feed = self.get_feed(name)
if not feed:
irc.error(_('That\'s not a valid RSS feed command name.'))
return
self.remove_feed(feed)
irc.replySuccess()
remove = wrap(remove, ['feedName'])
class announce(callbacks.Commands):
@internationalizeDocstring
def list(self, irc, msg, args, channel):
"""[<channel>]
Returns the list of feeds announced in <channel>. <channel> is
only necessary if the message isn't sent in the channel itself.
"""
announce = conf.supybot.plugins.RSS.announce
feeds = format('%L', list(announce.get(channel)()))
irc.reply(feeds or _('I am currently not announcing any feeds.'))
list = wrap(list, ['channel',])
@internationalizeDocstring
def add(self, irc, msg, args, channel, feeds):
"""[<channel>] <name|url> [<name|url> ...]
Adds the list of feeds to the current list of announced feeds in
<channel>. Valid feeds include the names of registered feeds as
well as URLs for RSS feeds. <channel> is only necessary if the
message isn't sent in the channel itself.
"""
plugin = irc.getCallback('RSS')
invalid_feeds = [x for x in feeds if not plugin.get_feed(x)
and not utils.web.urlRe.match(x)]
if invalid_feeds:
irc.error(format(_('These feeds are unknown: %L'),
invalid_feeds), Raise=True)
announce = conf.supybot.plugins.RSS.announce
S = announce.get(channel)()
for name in feeds:
S.add(name)
announce.get(channel).setValue(S)
irc.replySuccess()
for name in feeds:
feed = plugin.get_feed(name)
if not feed:
register_feed_config(name, name)
plugin.register_feed(name, name, True, False)
feed = plugin.get_feed(name)
plugin.announce_feed(feed, True)
add = wrap(add, [('checkChannelCapability', 'op'),
many(first('url', 'feedName'))])
@internationalizeDocstring
def remove(self, irc, msg, args, channel, feeds):
"""[<channel>] <name|url> [<name|url> ...]
Removes the list of feeds from the current list of announced feeds
in <channel>. Valid feeds include the names of registered feeds as
well as URLs for RSS feeds. <channel> is only necessary if the
message isn't sent in the channel itself.
"""
announce = conf.supybot.plugins.RSS.announce
S = announce.get(channel)()
for feed in feeds:
S.discard(feed)
announce.get(channel).setValue(S)
irc.replySuccess()
remove = wrap(remove, [('checkChannelCapability', 'op'),
many(first('url', 'feedName'))])
@internationalizeDocstring
def channels(self, irc, msg, args, feed):
"""<name|url>
Returns a list of channels that the given feed name or URL is being
announced to.
"""
plugin = irc.getCallback('RSS')
if not plugin.get_feed(feed):
irc.error(_("Unknown feed %s" % feed), Raise=True)
channels = []
for ircnet in world.ircs:
for channel in ircnet.state.channels:
if feed in plugin.registryValue('announce', channel, ircnet.network):
channels.append(ircnet.network + channel)
if channels:
irc.reply(format("%s is announced to %L.", feed, channels))
else:
irc.reply("%s is not announced to any channels." % feed)
channels = wrap(channels, ['feedName'])
@internationalizeDocstring
def rss(self, irc, msg, args, url, n):
"""<name|url> [<number of headlines>]
Gets the title components of the given RSS feed.
If <number of headlines> is given, return only that many headlines.
"""
self.log.debug('Fetching %u', url)
try:
feed = self.get_feed(url)
if not feed:
feed = Feed(url, url, True)
except InvalidFeedUrl:
irc.error('%s is not a valid feed URL or name.' % url, Raise=True)
channel = msg.channel
self.update_feed_if_needed(feed)
entries = feed.entries
if not entries:
s = _('Couldn\'t get RSS feed.')
# If we got a soft parsing exception on our last run, show the error.
if feed.last_exception is not None:
s += _(' Parser error: ')
s += str(feed.last_exception)
irc.error(s)
return
n = n or self.registryValue('defaultNumberOfHeadlines', channel, irc.network)
entries = list(filter(lambda e:self.should_send_entry(irc.network, channel, e),
feed.entries))
entries = entries[:n]
headlines = map(lambda e:self.format_entry(irc.network, channel, feed, e, False),
entries)
sep = self.registryValue('headlineSeparator', channel, irc.network)
irc.replies(headlines, joiner=sep)
rss = wrap(rss, [first('url', 'feedName'), additional('int')])
@internationalizeDocstring
def info(self, irc, msg, args, url):
"""<url|feed>
Returns information from the given RSS feed, namely the title,
URL, description, and last update date, if available.
"""
try:
url = self.registryValue('feeds.%s' % url)
except registry.NonExistentRegistryEntry:
pass
feed = self.get_feed(url)
if not feed:
feed = Feed(url, url, True)
self.update_feed_if_needed(feed)
info = feed.data
if not info:
irc.error(_('I couldn\'t retrieve that RSS feed.'))
return
# check the 'modified_parsed' key, if it's there, convert it here first
if 'modified' in info:
seconds = time.mktime(info['modified_parsed'])
now = time.mktime(time.gmtime())
when = utils.timeElapsed(now - seconds) + ' ago'
else:
when = _('time unavailable')
title = info.get('title', _('unavailable'))
desc = info.get('description', _('unavailable'))
link = info.get('link', _('unavailable'))
# The rest of the entries are all available in the channel key
response = format(_('Title: %s; URL: %u; '
'Description: %s; Last updated: %s.'),
title, link, desc, when)
irc.reply(utils.str.normalizeWhitespace(response))
info = wrap(info, [first('url', 'feedName')])
RSS = internationalizeDocstring(RSS)
Class = RSS
# vim:set shiftwidth=4 softtabstop=4 expandtab textwidth=79: