PyLink/protocols/clientbot.py

import time
import string
import threading

from pylinkirc import utils, conf
from pylinkirc.log import log
from pylinkirc.classes import Protocol, IrcUser, IrcServer

class ClientbotWrapperProtocol(Protocol):
    def __init__(self, irc):
        super().__init__(irc)

        # This is just a fallback. Actual casemapping is fetched by handle_005()
        self.casemapping = 'ascii'

        self.caps = {}

        # Initialize counter-based pseudo UID  generators
        self.uidgen = utils.PUIDGenerator('PUID')
        self.sidgen = utils.PUIDGenerator('PSID')

        # Tracks the users sent in a list of /who replies, so that users can be bursted all at once
        # when ENDOFWHO is received.
        self.who_received = set()

        # This stores channel->Timer object mappings for users that we're waiting for a kick
        # acknowledgement for. The timer is set to send a NAMES request to the uplink to prevent
        # things like failed KICK attempts from desyncing plugins like relay.
        self.kick_queue = {}

    def _expandPUID(self, uid):
        """
        Returns the real nick for the given PUID.
        """
        if uid in self.irc.users:
            nick = self.irc.users[uid].nick
            log.debug('(%s) Mangling target PUID %s to nick %s', self.irc.name, uid, nick)
            return nick
        return uid

    def _formatText(self, source, text):
        """
        Formats text with the given sender as a prefix.
        """
        if self.irc.pseudoclient and source == self.irc.pseudoclient.uid:
            return text
        else:
            # TODO: configurable formatting
            return '<%s> %s' % (self.irc.getFriendlyName(source), text)

    def connect(self):
        """Initializes a connection to a server."""
        ts = self.irc.start_ts
        f = self.irc.send

        # TODO: fetch channel/user/prefix modes from RPL_ISUPPORT.
        #self.irc.prefixmodes = {'q': '~', 'a': '&', 'o': '@', 'h': '%', 'v': '+'}

        # HACK: Replace the SID from the config options with our own.
        old_sid = self.irc.sid
        self.irc.sid = sid = self.sidgen.next_uid()
        self.irc.servers[sid] = self.irc.servers[old_sid]
        del self.irc.servers[old_sid]

        sendpass = self.irc.serverdata.get("sendpass")
        if sendpass:
            f('PASS %s' % sendpass)

        # This is a really gross hack to get the defined NICK/IDENT/HOST/GECOS.
        # But this connection stuff is done before any of the spawnClient stuff in
        # services_support fires.
        self.conf_nick = self.irc.serverdata.get('pylink_nick') or conf.conf["bot"].get("nick", "PyLink")
        f('NICK %s' % (self.conf_nick))
        ident = self.irc.serverdata.get('pylink_ident') or conf.conf["bot"].get("ident", "pylink")
        f('USER %s 8 * %s' % (ident, # TODO: per net realnames or hostnames aren't implemented yet.
                              conf.conf["bot"].get("realname", "PyLink Clientbot")))

    def spawnClient(self, nick, ident='unknown', host='unknown.host', realhost=None, modes=set(),
            server=None, ip='0.0.0.0', realname=None, ts=None, opertype=None,
            manipulatable=False):
        """
        STUB: Pretends to spawn a new client with a subset of the given options.
        """

        server = server or self.irc.sid
        uid = self.uidgen.next_uid()

        ts = ts or int(time.time())
        realname = realname or ''
        log.debug('(%s) spawnClient stub called, saving nick %s as PUID %s', self.irc.name, nick, uid)
        u = self.irc.users[uid] = IrcUser(nick, ts, uid, ident=ident, host=host, realname=realname, manipulatable=manipulatable)
        log.debug('(%s) self.irc.users: %s', self.irc.name, self.irc.users)
        self.irc.servers[server].users.add(uid)
        return u

    def spawnServer(self, name, sid=None, uplink=None, desc=None, endburst_delay=0):
        """
        STUB: Pretends to spawn a new server with a subset of the given options.
        """
        name = name.lower()
        sid = self.sidgen.next_sid()
        self.irc.servers[sid] = IrcServer(uplink, name)
        return sid

    def away(self, source, text):
        """STUB: sets away messages for clients internally."""
        log.debug('(%s) away: target is %s, internal client? %s', self.irc.name, source, self.irc.isInternalClient(source))
        if not self.irc.isInternalClient(source):
            log.debug('(%s) away: sending AWAY hook from %s with text %r', self.irc.name, source, text)
            self.irc.callHooks([source, 'AWAY', {'text': text}])

        self.irc.users[source].away = text

    def invite(self, client, target, channel):
        """Invites a user to a channel."""
        self.irc.send('INVITE %s %s' % (self.irc.getFriendlyName(target), channel))

    def join(self, client, channel):
        """STUB: Joins a user to a channel."""
        channel = self.irc.toLower(channel)

        self.irc.channels[channel].users.add(client)
        self.irc.users[client].channels.add(channel)

        # Only joins for the main PyLink client are actually forwarded. Others are ignored.
        if self.irc.pseudoclient and client == self.irc.pseudoclient.uid:
            self.irc.send('JOIN %s' % channel)
            # Send a /who request right after
            self.irc.send('WHO %s' % channel)
        else:
            log.debug('(%s) join: faking JOIN of client %s/%s to %s', self.irc.name, client,
                      self.irc.getFriendlyName(client), channel)
            self.irc.callHooks([client, 'CLIENTBOT_JOIN', {'channel': channel}])

    def kick(self, source, channel, target, reason=''):
        """Sends channel kicks."""

        if self.irc.isInternalClient(target):
            # Target was one of our virtual clients. Just remove them from the state.
            self.handle_part(target, 'KICK', [channel, reason])
            return

        # TODO: handle kick failures and send rejoin hooks for the target
        reason = self._formatText(source, reason)
        self.irc.send('KICK %s %s :%s' % (channel, self._expandPUID(target), reason))

        # Don't update our state here: wait for the IRCd to send an acknowledgement instead.
        # There is essentially a 3 second wait to do this, as we send NAMES with a delay
        # to resync any users lost due to kicks being blocked, etc.
        if (channel not in self.kick_queue) or (not self.kick_queue[channel][1].is_alive()):
            # However, only do this if there isn't a NAMES request scheduled already.
            t = threading.Timer(3, lambda: self.irc.send('NAMES %s' % channel))
            log.debug('(%s) kick: setting NAMES timer for %s on %s', self.irc.name, target, channel)

            # Store the channel, target UID, and timer object in the internal kick queue.
            self.kick_queue[channel] = ({target}, t)
            t.start()
        else:
            log.debug('(%s) kick: adding %s to kick queue for channel %s', self.irc.name, target, channel)
            self.kick_queue[channel][0].add(target)

        if not self.irc.isInternalClient(target):
            # Send a clientbot_kick hook only if the target is an external client. Kicks between
            # users on fully-linked relay networks would otherwise have no message attached to them.
            self.irc.callHooks([source, 'CLIENTBOT_KICK', {'channel': channel, 'target': target, 'text': reason}])

    def message(self, source, target, text, notice=False):
        """Sends messages to the target."""
        command = 'NOTICE' if notice else 'PRIVMSG'

        if self.irc.pseudoclient and self.irc.pseudoclient.uid == source:
            self.irc.send('%s %s :%s' % (command, self._expandPUID(target), text))
        elif utils.isChannel(target):
            self.irc.callHooks([source, 'CLIENTBOT_MESSAGE', {'target': target, 'is_notice': notice, 'text': text}])

    def nick(self, source, newnick):
        """STUB: Sends NICK changes."""
        if source == self.irc.pseudoclient.uid:
            self.irc.send('NICK :%s' % (channel, self._expandPUID(target), reason))
        else:
            self.irc.callHooks([source, 'CLIENTBOT_NICK', {'newnick': newnick}])
        self.irc.users[source].nick = newnick

    def notice(self, source, target, text):
        """Sends notices to the target."""
        # Wrap around message(), which does all the text formatting for us.
        self.message(source, target, text, notice=True)

    def ping(self, source=None, target=None):
        """
        Sends PING to the uplink.
        """
        if self.irc.uplink:
            self.irc.send('PING %s' % self.irc.getFriendlyName(self.irc.uplink))

            # Poll WHO periodically to figure out any ident/host/away status changes.
            for channel in self.irc.pseudoclient.channels:
                self.irc.send('WHO %s' % channel)

    def part(self, source, channel, reason=''):
        """STUB: Parts a user from a channel."""
        self.irc.channels[channel].removeuser(source)
        self.irc.users[source].channels.discard(channel)

        # Only parts for the main PyLink client are actually forwarded. Others are ignored.
        if self.irc.pseudoclient and source == self.irc.pseudoclient.uid:
            self.irc.send('PART %s :%s' % (channel, reason))
        else:
            self.irc.callHooks([source, 'CLIENTBOT_PART', {'channel': channel, 'text': reason}])

    def quit(self, source, reason):
        """STUB: Quits a client."""
        userdata = self.irc.users[source]
        self.removeClient(source)
        self.irc.callHooks([source, 'CLIENTBOT_QUIT', {'text': reason, 'userdata': userdata}])

    def sjoin(self, server, channel, users, ts=None, modes=set()):
        """STUB: bursts joins from a server."""
        # This stub only updates the state internally with the users
        # given. modes and TS are currently ignored.
        puids = {u[-1] for u in users}
        for user in puids:
            self.irc.users[user].channels.add(channel)

        self.irc.channels[channel].users |= puids

    def squit(self, source, target, text):
        """STUB: SQUITs a server."""
        # What this actually does is just handle the SQUIT internally: i.e.
        # Removing pseudoclients and pseudoservers.
        self._squit(source, 'CLIENTBOT_VIRTUAL_SQUIT', [target, text])

    def _stub(self, *args):
        """Stub outgoing command function (does nothing)."""
        return
    kill = mode = topic = topicBurst = knock = updateClient = numeric = _stub

    def updateClient(self, target, field, text):
        """Updates the known ident, host, or realname of a client."""
        if field == 'IDENT':
            self.irc.users[target].ident = text
        elif field == 'HOST':
            self.irc.users[target].host = text
        elif field in ('REALNAME', 'GECOS'):
            self.irc.users[target].realname = text
        else:
            raise NotImplementedError

    def handle_events(self, data):
        """Event handler for the RFC1459/2812 (clientbot) protocol."""
        data = data.split(" ")
        try:
            args = self.parsePrefixedArgs(data)
            sender = args[0]
            command = args[1]
            args = args[2:]

        except IndexError:
            # Raw command without an explicit sender; assume it's being sent by our uplink.
            args = self.parseArgs(data)
            idsource = sender = self.irc.uplink
            command = args[0]
            args = args[1:]
        else:
            # PyLink as a services framework expects UIDs and SIDs for everythiung. Since we connect
            # as a bot here, there's no explicit user introduction, so we're going to generate
            # pseudo-uids and pseudo-sids as we see prefixes.
            if '!' not in sender:
                # Sender is a server name.
                idsource = self._getSid(sender)
                if idsource not in self.irc.servers:
                    idsource = self.spawnServer(sender)
            else:
                # Sender is a nick!user@host prefix. Split it into its relevant parts.
                nick, ident, host = utils.splitHostmask(sender)
                idsource = self.irc.nickToUid(nick)
                if not idsource:
                    idsource = self.spawnClient(nick, ident, host, server=self.irc.uplink).uid

        try:
            func = getattr(self, 'handle_'+command.lower())
        except AttributeError:  # unhandled command
            pass
        else:
            parsed_args = func(idsource, command, args)
            if parsed_args is not None:
                return [idsource, command, parsed_args]

    def handle_001(self, source, command, args):
        """
        Handles 001 / RPL_WELCOME.
        """
        # enumerate our uplink
        self.irc.uplink = source

    def handle_005(self, source, command, args):
        """
        Handles 005 / RPL_ISUPPORT.
        """
        self.caps.update(self.parseCapabilities(args[1:-1]))
        log.debug('(%s) handle_005: self.caps is %s', self.irc.name, self.caps)

        if 'CHANMODES' in self.caps:
            self.irc.cmodes['*A'], self.irc.cmodes['*B'], self.irc.cmodes['*C'], self.irc.cmodes['*D'] = \
                self.caps['CHANMODES'].split(',')
        log.debug('(%s) handle_005: cmodes: %s', self.irc.name, self.irc.cmodes)

        if 'USERMODES' in self.caps:
            self.irc.umodes['*A'], self.irc.umodes['*B'], self.irc.umodes['*C'], self.irc.umodes['*D'] = \
                self.caps['USERMODES'].split(',')
        log.debug('(%s) handle_005: umodes: %s', self.irc.name, self.irc.umodes)

        self.casemapping = self.caps.get('CASEMAPPING', self.casemapping)
        log.debug('(%s) handle_005: casemapping set to %s', self.irc.name, self.casemapping)

        if 'PREFIX' in self.caps:
            self.irc.prefixmodes = self.parsePrefixes(self.caps['PREFIX'])
            log.debug('(%s) handle_005: prefix modes set to %s', self.irc.name, self.irc.prefixmodes)

        if not self.irc.connected.is_set():
            self.irc.connected.set()

            # Run autoperform commands.
            for line in self.irc.serverdata.get("autoperform", []):
                self.irc.send(line)

            return {'parse_as': 'ENDBURST'}

    def handle_353(self, source, command, args):
        """
        Handles 353 / RPL_NAMREPLY.
        """
        # <- :charybdis.midnight.vpn 353 ice = #test :ice @GL

        # Mark "@"-type channels as secret automatically, per RFC2812.
        channel = self.irc.toLower(args[2])
        if args[1] == '@':
            self.irc.applyModes(channel, [('+s', None)])

        names = set()
        modes = set()
        prefix_to_mode = {v:k for k, v in self.irc.prefixmodes.items()}
        prefixes = ''.join(self.irc.prefixmodes.values())

        for name in args[-1].split():
            nick = name.lstrip(prefixes)

            # Get the PUID for the given nick. If one doesn't exist, spawn
            # a new virtual user. TODO: wait for WHO responses for each nick before
            # spawning in order to get a real ident/host.
            idsource = self.irc.nickToUid(nick) or self.spawnClient(nick, server=self.irc.uplink).uid

            # Queue these virtual users to be joined if they're not already in the channel,
            # or we're waiting for a kick acknowledgment for them.
            if (idsource not in self.irc.channels[channel].users) or (idsource in \
                    self.kick_queue.get(channel, ([],))[0]):
                names.add(idsource)
                self.irc.users[idsource].channels.add(channel)

            # Process prefix modes
            for char in name:
                if char in self.irc.prefixmodes.values():
                    modes.add(('+' + prefix_to_mode[char], idsource))
                else:
                    break

        # Statekeeping: make sure the channel's user list is updated!
        self.irc.channels[channel].users |= names
        self.irc.applyModes(channel, modes)

        log.debug('(%s) handle_353: adding users %s to %s', self.irc.name, names, channel)
        log.debug('(%s) handle_353: adding modes %s to %s', self.irc.name, modes, channel)

        # Unless /WHO has already been received for the given channel, we generally send the hook
        # for JOIN after /who data is received, to enumerate the ident, host, and real names of
        # users.
        if names and hasattr(self.irc.channels[channel], 'who_received'):
            # /WHO *HAS* already been received. Send JOIN hooks here because we use this to keep
            # track of any failed KICK attempts sent by the relay bot.
            log.debug('(%s) handle_353: sending JOIN hook because /WHO was already received for %s',
                      self.irc.name, channel)
            return {'channel': channel, 'users': names, 'modes': self.irc.channels[channel].modes,
                    'parse_as': "JOIN"}

    def handle_352(self, source, command, args):
        """
        Handles 352 / RPL_WHOREPLY.
        """
        # parameter count:               0   1     2       3         4                      5   6  7
        # <- :charybdis.midnight.vpn 352 ice #test ~pylink 127.0.0.1 charybdis.midnight.vpn ice H+ :0 PyLink
        # <- :charybdis.midnight.vpn 352 ice #test ~gl 127.0.0.1 charybdis.midnight.vpn GL H*@ :0 realname
        ident = args[2]
        host = args[3]
        nick = args[5]
        status = args[6]
        # Hopcount and realname field are together. We only care about the latter.
        realname = args[-1].split(' ', 1)[-1]
        uid = self.irc.nickToUid(nick)

        self.updateClient(uid, 'IDENT', ident)
        self.updateClient(uid, 'HOST', host)
        self.updateClient(uid, 'GECOS', realname)

        # The status given uses the following letters: <H|G>[*][@|+]
        # H means here (not marked /away)
        # G means away is set (we'll have to fake a message because it's not given)
        # * means IRCop.
        # The rest are prefix modes. Multiple can be given by the IRCd if multiple are set
        log.debug('(%s) handle_352: status string on user %s: %s', self.irc.name, nick, status)
        if status[0] == 'G':
            log.debug('(%s) handle_352: calling away() with argument', self.irc.name)
            self.away(uid, 'Away')
        elif status[0] == 'H':
            log.debug('(%s) handle_352: calling away() without argument', self.irc.name)
            self.away(uid, '')  # Unmark away status
        else:
            log.warning('(%s) handle_352: got wrong string %s for away status', self.irc.name, status[0])

        if '*' in status:  # Track IRCop status
            self.irc.callHooks([uid, 'CLIENT_OPERED', {'text': 'IRC Operator'}])
        #else:  # TODO: track de-opers as well

        self.who_received.add(uid)

    def handle_315(self, source, command, args):
        """
        Handles 315 / RPL_ENDOFWHO.
        """
        # <- :charybdis.midnight.vpn 315 ice #test :End of /WHO list.
        # Join all the users in which the last batch of /who requests were received.
        users = self.who_received.copy()
        self.who_received.clear()

        channel = self.irc.toLower(args[1])
        self.irc.channels[channel].who_received = True

        return {'channel': channel, 'users': users, 'modes': self.irc.channels[channel].modes,
                'parse_as': "JOIN"}

    def handle_433(self, source, command, args):
        # <- :millennium.overdrivenetworks.com 433 * ice :Nickname is already in use.
        # HACK: I don't like modifying the config entries raw, but this is difficult because
        # irc.pseudoclient doesn't exist as an attribute until we get run the ENDBURST stuff
        # in service_support (this is mapped to 005 here).
        self.conf_nick += '_'
        self.irc.serverdata['pylink_nick'] = self.conf_nick
        self.irc.send('NICK %s' % self.conf_nick)
    handle_432 = handle_437 = handle_433

    def handle_join(self, source, command, args):
        """
        Handles incoming JOINs.
        """
        # <- :GL|!~GL@127.0.0.1 JOIN #whatever
        channel = self.irc.toLower(args[0])
        self.join(source, channel)

        return {'channel': channel, 'users': [source], 'modes': self.irc.channels[channel].modes}

    def handle_kick(self, source, command, args):
        """
        Handles incoming KICKs.
        """
        # <- :GL!~gl@127.0.0.1 KICK #whatever GL| :xd
        channel = self.irc.toLower(args[0])
        target = self.irc.nickToUid(args[1])

        try:
            reason = args[2]
        except IndexError:
            reason = ''

        if channel in self.kick_queue:
            # Remove this client from the kick queue if present there.
            log.debug('(%s) kick: removing %s from kick queue for channel %s', self.irc.name, target, channel)
            self.kick_queue[channel][0].discard(target)

            if not self.kick_queue[channel][0]:
                log.debug('(%s) kick: cancelling kick timer for channel %s (all kicks accounted for)', self.irc.name, channel)
                # There aren't any kicks that failed to be acknowledged. We can remove the timer now
                self.kick_queue[channel][1].cancel()
                del self.kick_queue[channel]

        self.handle_part(target, 'KICK', [channel, reason])
        return {'channel': channel, 'target': target, 'text': reason}

    def handle_mode(self, source, command, args):
        """Handles MODE changes."""
        # <- :GL!~gl@127.0.0.1 MODE #dev +v ice
        # <- :ice MODE ice :+Zi
        target = args[0]
        if utils.isChannel(target):
            target = self.irc.toLower(target)
            oldobj = self.irc.channels[target].deepcopy()
        else:
            target = self.irc.nickToUid(target)
            oldobj = None
        modes = args[1:]
        changedmodes = self.irc.parseModes(target, modes)
        self.irc.applyModes(target, changedmodes)

        return {'target': target, 'modes': changedmodes, 'oldchan': oldobj}

    def handle_nick(self, source, command, args):
        """Handles NICK changes."""
        # <- :GL|!~GL@127.0.0.1 NICK :GL_
        oldnick = self.irc.users[source].nick
        self.nick(source, args[0])
        return {'newnick': args[0], 'oldnick': oldnick}

    def handle_part(self, source, command, args):
        """
        Handles incoming PARTs.
        """
        # <- :GL|!~GL@127.0.0.1 PART #whatever
        channels = list(map(self.irc.toLower, args[0].split(',')))
        try:
            reason = args[1]
        except IndexError:
            reason = ''

        for channel in channels:
            self.irc.channels[channel].removeuser(source)
        self.irc.users[source].channels -= set(channels)

        return {'channels': channels, 'text': reason}

    def handle_ping(self, source, command, args):
        """
        Handles incoming PING requests.
        """
        self.irc.send('PONG :%s' % args[0])

    def handle_pong(self, source, command, args):
        """
        Handles incoming PONG.
        """
        if source == self.irc.uplink:
            self.irc.lastping = time.time()

    def handle_privmsg(self, source, command, args):
        """Handles incoming PRIVMSG/NOTICE."""
        # <- :sender PRIVMSG #dev :afasfsa
        # <- :sender NOTICE somenick :afasfsa
        target = args[0]

        # We use lowercase channels internally.
        if utils.isChannel(target):
            target = self.irc.toLower(target)
        else:
            target = self._getUid(target)
        return {'target': target, 'text': args[1]}

    def handle_quit(self, source, command, args):
        """Handles incoming QUITs."""
        self.quit(source, args[0])
        return {'text': args[0]}

    handle_notice = handle_privmsg

Class = ClientbotWrapperProtocol