#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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###

"""
Enforcer: Enforces capabilities on a channel, watching MODEs, KICKs,
                 JOINs, etc. to make sure they match the channel's config.
"""

__revision__ = "$Id$"

import plugins

import conf
import ircdb
import ircmsgs
import plugins
import privmsgs
import ircutils
import callbacks

def configure(onStart, afterConnect, advanced):
    from questions import expect, anything, something, yn
    onStart.append('load Enforcer')
    chanserv = something('What\'s the name of ChanServ on your network?')
    if yn('Do you want the bot to take revenge on rule breakers?') == 'y':
        revenge = True
    else:
        revenge = False
    onStart.append('enforcer start %s' % chanserv)
    onStart.append('enforcer config revenge %s' % revenge)

conf.registerPlugin('Enforcer')
conf.registerChannelValue(conf.supybot.plugins.Enforcer, 'autoOp',
    registry.Boolean(False, """Determines whether the bot will automatically op
    people with the <channel>.op capability when they join the channel."""))
conf.registerChannelValue(conf.supybot.plugins.Enforcer, 'autoHalfop',
    registry.Boolean(False, """Determines whether the bot will automatically
    halfop people with the <channel>.halfop capability when they join the
    channel."""))
conf.registerChannelValue(conf.supybot.plugins.Enforcer, 'autoVoice',
    registry.Boolean(False, """Determines whether the bot will automatically
    voice people with the <channel>.voice capability when they join the
    channel."""))
conf.registerChannelValue(conf.supybot.plugins.Enforcer, 'takeRevenge',
    registry.Boolean(False, """Determines whether the bot will take revenge on
    people who do things it doesn't like (somewhat like 'bitch mode' in other
    IRC bots)."""))
_chanCap = ircdb.makeChannelCapability
class Enforcer(callbacks.Privmsg):
    started = False
    def start(self, irc, msg, args):
        """[<CHANSERV>]

        Starts the Enforcer plugin.  <chanserv> is the nick for the chanserv
        aspect of Services (it defaults to ChanServ).
        """
        self.topics = {}
        chanserv = privmsgs.getArgs(args, required=0, optional=1)
        self.chanserv = ircutils.IrcString(chanserv or 'ChanServ')
        self.started = True
        for channel in irc.state.channels:
            irc.queueMsg(ircmsgs.topic(channel))
        irc.replySuccess()
    start = privmsgs.checkCapability(start, 'admin')

    def doJoin(self, irc, msg):
        if not self.started:
            self.log.warning('Enforcer not started.')
            return
        channel = msg.args[0]
        c = ircdb.channels.getChannel(channel)
        if c.checkBan(msg.prefix):
            irc.queueMsg(ircmsgs.ban(channel, ircutils.banmask(msg.prefix)))
            irc.queueMsg(ircmsgs.kick(channel, msg.nick))
        elif ircdb.checkCapability(msg.prefix, _chanCap(channel, 'op')):
            if self.registryValue('autoOp', channel):
                irc.queueMsg(ircmsgs.op(channel, msg.nick))
        elif ircdb.checkCapability(msg.prefix, _chanCap(channel, 'halfop')):
            if self.registryValue('autoHalfop', channel):
                irc.queueMsg(ircmsgs.halfop(channel, msg.nick))
        elif ircdb.checkCapability(msg.prefix, _chanCap(channel, 'voice')):
            if self.registryValue('autoVoice', channel):
                irc.queueMsg(ircmsgs.voice(channel, msg.nick))

    def doTopic(self, irc, msg):
        if not self.started:
            self.log.info('Enforcer not started.')
            return
        channel = msg.args[0]
        topic = msg.args[1]
        if msg.nick != irc.nick and \
           not ircdb.checkCapabilities(msg.prefix,
                                       (_chanCap(channel, 'op'),
                                        _chanCap(channel, 'topic'))):
            irc.queueMsg(ircmsgs.topic(channel, self.topics[channel]))
            if self.registryValue('takeRevenge', channel):
                irc.queueMsg(ircmsgs.kick(channel, msg.nick,
                                          conf.supybot.replies.noCapability() %
                                          _chanCap(channel, 'topic')))
        else:
            self.topics[channel] = msg.args[1]

    def do332(self, irc, msg):
        # This command gets sent right after joining a channel.
        if not self.started:
            self.log.info('Enforcer not started.')
            return
        (channel, topic) = msg.args[1:]
        self.topics[channel] = topic

    def _isProtected(self, channel, hostmask):
        capabilities = [_chanCap(channel, 'op'),_chanCap(channel, 'protected')]
        return ircdb.checkCapabilities(hostmask, capabilities)

    def _revenge(self, irc, channel, hostmask):
        irc.queueMsg(ircmsgs.ban(channel, ircutils.banmask(hostmask)))
        irc.queueMsg(ircmsgs.kick(channel,ircutils.nickFromHostmask(hostmask)))

    def doKick(self, irc, msg):
        if not self.started:
            self.log.info('Enforcer not started.')
            return
        channel = msg.args[0]
        kicked = msg.args[1].split(',')
        deop = False
        if msg.nick != irc.nick and \
           not ircdb.checkCapability(msg.prefix, _chanCap(channel, 'op')):
            for nick in kicked:
                hostmask = irc.state.nickToHostmask(nick)
                if nick == irc.nick:
                    # Must be a sendMsg so he joins the channel before MODEing.
                    irc.sendMsg(ircmsgs.join(channel))
                    deop = True
                if self._isProtected(channel, hostmask):
                    deop = True
                    irc.queueMsg(ircmsgs.invite(channel, msg.args[1]))
            if deop:
                deop = False
                if self.registryValue('takeRevenge', channel):
                    self._revenge(irc, channel, msg.prefix)
                else:
                    irc.queueMsg(ircmsgs.deop(channel, msg.nick))

    def doMode(self, irc, msg):
        if not self.started:
            self.log.info('Enforcer not started.')
            return
        channel = msg.args[0]
        if not ircutils.isChannel(channel) or msg.nick == self.chanserv:
            return
        if msg.nick != irc.nick and \
           not ircdb.checkCapability(msg.prefix, _chanCap(channel, 'op')):
            for (mode, value) in ircutils.separateModes(msg.args[1:]):
                if value == msg.nick:
                    continue
                elif mode == '+o' and value != irc.nick:
                    hostmask = irc.state.nickToHostmask(value)
                    if ircdb.checkCapability(channel,
                                           ircdb.makeAntiCapability('op')):
                        irc.queueMsg(ircmsgs.deop(channel, value))
                elif mode == '+h' and value != irc.nick:
                    hostmask = irc.state.nickToHostmask(value)
                    if ircdb.checkCapability(channel,
                                           ircdb.makeAntiCapability('halfop')):
                        irc.queueMsg(ircmsgs.dehalfop(channel, value))
                elif mode == '+v' and value != irc.nick:
                    hostmask = irc.state.nickToHostmask(value)
                    if ircdb.checkCapability(channel,
                                           ircdb.makeAntiCapability('voice')):
                        irc.queueMsg(ircmsgs.devoice(channel, value))
                elif mode == '-o':
                    hostmask = irc.state.nickToHostmask(value)
                    if self._isProtected(channel, hostmask):
                        irc.queueMsg(ircmsgs.op(channel, value))
                        if self.registryValue('takeRevenge', channel):
                            self._revenge(irc, channel, msg.prefix)
                        else:
                            irc.queueMsg(ircmsgs.deop(channel, msg.nick))
                elif mode == '-h':
                    hostmask = irc.state.nickToHostmask(value)
                    if self._isProtected(channel, hostmask):
                        irc.queueMsg(ircmsgs.halfop(channel, value))
                        if self.registryValue('takeRevenge', channel):
                            self._revenge(irc, channel, msg.prefix)
                        else:
                            irc.queueMsg(ircmsgs.deop(channel, msg.nick))
                elif mode == '-v':
                    hostmask = irc.state.nickToHostmask(value)
                    if self._isProtected(channel, hostmask):
                        irc.queueMsg(ircmsgs.voice(channel, value))
                        if self.registryValue('takeRevenge', channel):
                            self._revenge(irc, channel, msg.prefix)
                        else:
                            irc.queueMsg(ircmsgs.deop(channel, msg.nick))
                elif mode == '+b':
                    # To be safe, only #channel.ops are allowed to ban.
                    if not ircdb.checkCapability(msg.prefix,
                                                 _chanCap(channel, 'op')):
                        irc.queueMsg(ircmsgs.unban(channel, value))
                        if self.registryValue('takeRevenge', channel):
                            self._revenge(irc, channel, msg.prefix)
                        else:
                            irc.queueMsg(ircmsgs.deop(channel, msg.nick))

    def __call__(self, irc, msg):
        if self.started:
            if ircutils.isUserHostmask(msg.prefix) and \
               not msg.nick == self.chanserv:
                return callbacks.Privmsg.__call__(self, irc, msg)


Class = Enforcer
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