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Initial pass of a mass-highlight blocking plugin (#359)
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James Lu
parent
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commit
3825b93dee
141
plugins/antispam.py
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141
plugins/antispam.py
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# antispam.py: Basic services-side spamfilters for IRC
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from pylinkirc import utils, world, conf
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from pylinkirc.log import log
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mydesc = ("Provides anti-spam functionality.")
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sbot = utils.register_service("antispam", default_nick="AntiSpam", desc=mydesc)
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def die(irc=None):
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utils.unregister_service("antispam")
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PUNISH_OPTIONS = ['kill', 'ban', 'quiet', 'kick']
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EXEMPT_OPTIONS = ['voice', 'halfop', 'op']
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DEFAULT_EXEMPT_OPTION = 'halfop'
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def _punish(irc, target, channel, reason):
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"""Punishes the target user."""
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if irc.is_oper(target, allowAuthed=False):
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log.debug("(%s) antispam: refusing to punish oper %s/%s", irc.name, target, irc.get_friendly_name(target))
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return
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exempt_level = irc.get_service_option('antispam', 'exempt_level', DEFAULT_EXEMPT_OPTION).lower()
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c = irc.channels[channel]
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if exempt_level not in EXEMPT_OPTIONS:
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log.error('(%s) Antispam exempt %r is not a valid setting, '
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'falling back to defaults; accepted settings include: %s',
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irc.name, exempt_level, ', '.join(EXEMPT_OPTIONS))
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exempt_level = DEFAULT_EXEMPT_OPTION
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if exempt_level == 'voice' and c.is_voice_plus(target):
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log.debug("(%s) antispam: refusing to punish voiced and above %s/%s", irc.name, target, irc.get_friendly_name(target))
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return
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elif exempt_level == 'halfop' and c.is_halfop_plus(target):
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log.debug("(%s) antispam: refusing to punish halfop and above %s/%s", irc.name, target, irc.get_friendly_name(target))
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return
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elif exempt_level == 'op' and c.is_op_plus(target):
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log.debug("(%s) antispam: refusing to punish op and above %s/%s", irc.name, target, irc.get_friendly_name(target))
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return
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my_uid = sbot.uids.get(irc.name)
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punishment = irc.get_service_option('antispam', 'punishment',
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'ban+kill').lower()
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bans = set()
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log.debug('(%s) antispam: got %r as punishment for %s/%s', irc.name, punishment,
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target, irc.get_friendly_name(target))
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def _ban():
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bans.add(irc.make_channel_ban(target))
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def _quiet():
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bans.add(irc.make_channel_ban(target, ban_type='quiet'))
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def _kick():
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irc.kick(my_uid, channel, target, reason)
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irc.call_hooks([my_uid, 'ANTISPAM_KICK', {'channel': channel, 'text': reason, 'target': target,
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'parse_as': 'KICK'}])
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def _kill():
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userdata = irc.users[target]
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irc.kill(my_uid, target, reason)
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irc.call_hooks([my_uid, 'ANTISPAM_KILL', {'target': target, 'text': reason,
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'userdata': userdata, 'parse_as': 'KILL'}])
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kill = False
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for action in set(punishment.split('+')):
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if action not in PUNISH_OPTIONS:
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log.error('(%s) Antispam punishment %r is not a valid setting; '
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'accepted settings include: %s OR any combination of '
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'these joined together with a "+".',
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irc.name, punishment, ', '.join(PUNISH_OPTIONS))
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return
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elif action == 'kill':
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kill = True # Delay kills so that the user data doesn't disappear.
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elif action == 'kick':
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_kick()
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elif action == 'ban':
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_ban()
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elif action == 'quiet':
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_quiet()
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if bans: # Set all bans at once to prevent spam
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irc.mode(my_uid, channel, bans)
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irc.call_hooks([my_uid, 'ANTISPAM_BAN',
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{'target': channel, 'modes': bans, 'parse_as': 'MODE'}])
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if kill:
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_kill()
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MASSHIGHLIGHT_DEFAULTS = {
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'min_length': 50,
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'min_nicks': 5,
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'reason': "Mass highlight spam is prohibited"
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}
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def handle_masshighlight(irc, source, command, args):
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"""Handles mass highlight attacks."""
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channel = args['target']
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text = args['text']
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mhl_settings = irc.get_service_option('antispam', 'masshighlight',
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MASSHIGHLIGHT_DEFAULTS)
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my_uid = sbot.uids.get(irc.name)
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if (not irc.connected.is_set()) or (not my_uid):
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# Break if the network isn't ready.
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log.debug("(%s) antispam: skipping processing; network isn't ready", irc.name)
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return
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elif not irc.is_channel(channel):
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# Not a channel.
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log.debug("(%s) antispam: skipping processing; %r is not a channel", irc.name, channel)
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return
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elif irc.is_internal_client(source):
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# Ignore messages from our own clients.
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log.debug("(%s) antispam: skipping processing message from internal client %s", irc.name, source)
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return
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elif channel not in irc.channels or my_uid not in irc.channels[channel].users:
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# We're not monitoring this channel.
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log.debug("(%s) antispam: skipping processing message from channel %r we're not in", irc.name, channel)
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return
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elif len(text) < mhl_settings.get('min_length', MASSHIGHLIGHT_DEFAULTS['min_length']):
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log.debug("(%s) antispam: skipping processing message %r; it's too short", irc.name, text)
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return
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# Strip :, from potential nicks
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words = [word.rstrip(':,') for word in text.split()]
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userlist = [irc.users[uid].nick for uid in irc.channels[channel].users.copy()]
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min_nicks = mhl_settings.get('min_nicks', MASSHIGHLIGHT_DEFAULTS['min_nicks'])
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# Don't allow repeating the same nick to trigger punishment
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nicks_caught = set()
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for word in words:
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if word in userlist:
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nicks_caught.add(word)
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if len(nicks_caught) >= min_nicks:
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reason = mhl_settings.get('reason', MASSHIGHLIGHT_DEFAULTS['reason'])
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log.debug('(%s) antispam: calling _punish on %s/%s', irc.name,
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source, irc.get_friendly_name(source))
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_punish(irc, source, channel, reason)
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break
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log.debug('(%s) antispam: got %s/%s nicks on message to %r', irc.name, len(nicks_caught), min_nicks, channel)
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utils.add_hook(handle_masshighlight, 'PRIVMSG')
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utils.add_hook(handle_masshighlight, 'NOTICE')
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