mirror of https://github.com/fluffle/goirc
308 lines
9.6 KiB
Go
308 lines
9.6 KiB
Go
package client
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// this file contains the basic set of event handlers
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// to manage tracking an irc connection etc.
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import (
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"github.com/fluffle/goirc/event"
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"strings"
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)
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// An IRC handler looks like this:
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type IRCHandler func(*Conn, *Line)
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// AddHandler() adds an event handler for a specific IRC command.
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//
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// Handlers are triggered on incoming Lines from the server, with the handler
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// "name" being equivalent to Line.Cmd. Read the RFCs for details on what
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// replies could come from the server. They'll generally be things like
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// "PRIVMSG", "JOIN", etc. but all the numeric replies are left as ascii
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// strings of digits like "332" (mainly because I really didn't feel like
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// putting massive constant tables in).
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func (conn *Conn) AddHandler(name string, f IRCHandler) {
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conn.Registry.AddHandler(name, NewHandler(f))
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}
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// Wrap f in an anonymous unboxing function
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func NewHandler(f IRCHandler) event.Handler {
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return event.NewHandler(func(ev ...interface{}) {
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f(ev[0].(*Conn), ev[1].(*Line))
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})
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}
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// Basic ping/pong handler
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func (conn *Conn) h_PING(line *Line) {
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conn.Raw("PONG :" + line.Args[0])
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}
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// Handler to trigger a "CONNECTED" event on receipt of numeric 001
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func (conn *Conn) h_001(line *Line) {
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// we're connected!
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conn.Dispatcher.Dispatch("connected", conn, line)
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// and we're being given our hostname (from the server's perspective)
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t := line.Args[len(line.Args)-1]
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if idx := strings.LastIndex(t, " "); idx != -1 {
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t = t[idx+1:]
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if idx = strings.Index(t, "@"); idx != -1 {
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conn.Me.Host = t[idx+1:]
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}
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}
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}
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// XXX: do we need 005 protocol support message parsing here?
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// probably in the future, but I can't quite be arsed yet.
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/*
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:irc.pl0rt.org 005 GoTest CMDS=KNOCK,MAP,DCCALLOW,USERIP UHNAMES NAMESX SAFELIST HCN MAXCHANNELS=20 CHANLIMIT=#:20 MAXLIST=b:60,e:60,I:60 NICKLEN=30 CHANNELLEN=32 TOPICLEN=307 KICKLEN=307 AWAYLEN=307 :are supported by this server
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:irc.pl0rt.org 005 GoTest MAXTARGETS=20 WALLCHOPS WATCH=128 WATCHOPTS=A SILENCE=15 MODES=12 CHANTYPES=# PREFIX=(qaohv)~&@%+ CHANMODES=beI,kfL,lj,psmntirRcOAQKVCuzNSMT NETWORK=bb101.net CASEMAPPING=ascii EXTBAN=~,cqnr ELIST=MNUCT :are supported by this server
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:irc.pl0rt.org 005 GoTest STATUSMSG=~&@%+ EXCEPTS INVEX :are supported by this server
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*/
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// Handler to deal with "433 :Nickname already in use"
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func (conn *Conn) h_433(line *Line) {
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// Args[1] is the new nick we were attempting to acquire
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conn.Nick(line.Args[1] + "_")
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// if this is happening before we're properly connected (i.e. the nick
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// we sent in the initial NICK command is in use) we will not receive
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// a NICK message to confirm our change of nick, so ReNick here...
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if line.Args[1] == conn.Me.Nick {
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conn.Me.ReNick(line.Args[1] + "_")
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}
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}
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// Handler NICK messages to inform us about nick changes
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func (conn *Conn) h_NICK(line *Line) {
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// all nicks should be handled the same way, our own included
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if n := conn.GetNick(line.Nick); n != nil {
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n.ReNick(line.Args[0])
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} else {
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conn.error("irc.NICK(): buh? unknown nick %s.", line.Nick)
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}
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}
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// Handle VERSION requests and CTCP PING
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func (conn *Conn) h_CTCP(line *Line) {
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if line.Args[0] == "VERSION" {
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conn.CtcpReply(line.Nick, "VERSION", "powered by goirc...")
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} else if line.Args[0] == "PING" {
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conn.CtcpReply(line.Nick, "PING", line.Args[2])
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}
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}
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// Handle JOINs to channels to maintain state
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func (conn *Conn) h_JOIN(line *Line) {
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ch := conn.GetChannel(line.Args[0])
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n := conn.GetNick(line.Nick)
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if ch == nil {
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// first we've seen of this channel, so should be us joining it
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// NOTE this will also take care of n == nil && ch == nil
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if n != conn.Me {
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conn.error("irc.JOIN(): buh? JOIN to unknown channel %s recieved"+
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"from (non-me) nick %s",
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line.Args[0], line.Nick)
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return
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}
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ch = conn.NewChannel(line.Args[0])
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// since we don't know much about this channel, ask server for info
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// we get the channel users automatically in 353 and the channel
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// topic in 332 on join, so we just need to get the modes
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conn.Mode(ch.Name)
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// sending a WHO for the channel is MUCH more efficient than
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// triggering a WHOIS on every nick from the 353 handler
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conn.Who(ch.Name)
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}
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if n == nil {
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// this is the first we've seen of this nick
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n = conn.NewNick(line.Nick, line.Ident, "", line.Host)
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// since we don't know much about this nick, ask server for info
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conn.Who(n.Nick)
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}
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// this takes care of both nick and channel linking \o/
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ch.AddNick(n)
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}
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// Handle PARTs from channels to maintain state
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func (conn *Conn) h_PART(line *Line) {
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ch := conn.GetChannel(line.Args[0])
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n := conn.GetNick(line.Nick)
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if ch != nil && n != nil {
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ch.DelNick(n)
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} else {
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conn.error("irc.PART(): buh? PART of channel %s by nick %s",
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line.Args[0], line.Nick)
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}
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}
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// Handle KICKs from channels to maintain state
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func (conn *Conn) h_KICK(line *Line) {
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// XXX: this won't handle autorejoining channels on KICK
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// it's trivial to do this in a seperate handler...
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ch := conn.GetChannel(line.Args[0])
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n := conn.GetNick(line.Args[1])
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if ch != nil && n != nil {
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ch.DelNick(n)
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} else {
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conn.error("irc.KICK(): buh? KICK from channel %s of nick %s",
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line.Args[0], line.Args[1])
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}
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}
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// Handle other people's QUITs
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func (conn *Conn) h_QUIT(line *Line) {
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if n := conn.GetNick(line.Nick); n != nil {
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n.Delete()
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} else {
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conn.error("irc.QUIT(): buh? QUIT from unknown nick %s", line.Nick)
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}
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}
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// Handle MODE changes for channels we know about (and our nick personally)
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func (conn *Conn) h_MODE(line *Line) {
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// channel modes first
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if ch := conn.GetChannel(line.Args[0]); ch != nil {
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conn.ParseChannelModes(ch, line.Args[1], line.Args[2:])
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} else if n := conn.GetNick(line.Args[0]); n != nil {
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// nick mode change, should be us
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if n != conn.Me {
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conn.error("irc.MODE(): buh? recieved MODE %s for (non-me) nick %s", line.Args[0], n.Nick)
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return
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}
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conn.ParseNickModes(n, line.Args[0])
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} else {
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conn.error("irc.MODE(): buh? not sure what to do with MODE %s", strings.Join(line.Args, " "))
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}
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}
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// Handle TOPIC changes for channels
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func (conn *Conn) h_TOPIC(line *Line) {
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if ch := conn.GetChannel(line.Args[0]); ch != nil {
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ch.Topic = line.Args[1]
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} else {
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conn.error("irc.TOPIC(): buh? topic change on unknown channel %s", line.Args[0])
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}
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}
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// Handle 311 whois reply
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func (conn *Conn) h_311(line *Line) {
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if n := conn.GetNick(line.Args[1]); n != nil {
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n.Ident = line.Args[2]
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n.Host = line.Args[3]
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n.Name = line.Args[4]
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} else {
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conn.error("irc.311(): buh? received WHOIS info for unknown nick %s", line.Args[1])
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}
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}
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// Handle 324 mode reply
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func (conn *Conn) h_324(line *Line) {
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if ch := conn.GetChannel(line.Args[1]); ch != nil {
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conn.ParseChannelModes(ch, line.Args[2], line.Args[3:])
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} else {
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conn.error("irc.324(): buh? received MODE settings for unknown channel %s", line.Args[1])
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}
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}
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// Handle 332 topic reply on join to channel
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func (conn *Conn) h_332(line *Line) {
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if ch := conn.GetChannel(line.Args[1]); ch != nil {
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ch.Topic = line.Args[2]
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} else {
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conn.error("irc.332(): buh? received TOPIC value for unknown channel %s", line.Args[1])
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}
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}
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// Handle 352 who reply
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func (conn *Conn) h_352(line *Line) {
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if n := conn.GetNick(line.Args[5]); n != nil {
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n.Ident = line.Args[2]
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n.Host = line.Args[3]
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// XXX: do we care about the actual server the nick is on?
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// or the hop count to this server?
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// last arg contains "<hop count> <real name>"
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a := strings.SplitN(line.Args[len(line.Args)-1], " ", 2)
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n.Name = a[1]
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if idx := strings.Index(line.Args[6], "*"); idx != -1 {
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n.Modes.Oper = true
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}
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if idx := strings.Index(line.Args[6], "H"); idx != -1 {
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n.Modes.Invisible = true
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}
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} else {
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conn.error("irc.352(): buh? got WHO reply for unknown nick %s", line.Args[5])
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}
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}
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// Handle 353 names reply
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func (conn *Conn) h_353(line *Line) {
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if ch := conn.GetChannel(line.Args[2]); ch != nil {
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nicks := strings.Split(line.Args[len(line.Args)-1], " ")
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for _, nick := range nicks {
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// UnrealIRCd's coders are lazy and leave a trailing space
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if nick == "" {
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continue
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}
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switch c := nick[0]; c {
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case '~', '&', '@', '%', '+':
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nick = nick[1:]
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fallthrough
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default:
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n := conn.GetNick(nick)
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if n == nil {
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// we don't know this nick yet!
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n = conn.NewNick(nick, "", "", "")
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}
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if n != conn.Me {
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// we will be in the names list, but should also be in
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// the channel's nick list from the JOIN handler above
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ch.AddNick(n)
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}
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p := ch.Nicks[n]
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switch c {
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case '~':
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p.Owner = true
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case '&':
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p.Admin = true
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case '@':
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p.Op = true
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case '%':
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p.HalfOp = true
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case '+':
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p.Voice = true
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}
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}
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}
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} else {
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conn.error("irc.353(): buh? received NAMES list for unknown channel %s", line.Args[2])
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}
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}
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// Handle 671 whois reply (nick connected via SSL)
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func (conn *Conn) h_671(line *Line) {
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if n := conn.GetNick(line.Args[1]); n != nil {
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n.Modes.SSL = true
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} else {
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conn.error("irc.671(): buh? received WHOIS SSL info for unknown nick %s", line.Args[1])
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}
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}
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// sets up the internal event handlers to do useful things with lines
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func (conn *Conn) SetupHandlers() {
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conn.AddHandler("CTCP", (*Conn).h_CTCP)
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conn.AddHandler("JOIN", (*Conn).h_JOIN)
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conn.AddHandler("KICK", (*Conn).h_KICK)
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conn.AddHandler("MODE", (*Conn).h_MODE)
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conn.AddHandler("NICK", (*Conn).h_NICK)
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conn.AddHandler("PART", (*Conn).h_PART)
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conn.AddHandler("PING", (*Conn).h_PING)
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conn.AddHandler("QUIT", (*Conn).h_QUIT)
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conn.AddHandler("TOPIC", (*Conn).h_TOPIC)
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conn.AddHandler("001", (*Conn).h_001)
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conn.AddHandler("311", (*Conn).h_311)
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conn.AddHandler("324", (*Conn).h_324)
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conn.AddHandler("332", (*Conn).h_332)
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conn.AddHandler("352", (*Conn).h_352)
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conn.AddHandler("353", (*Conn).h_353)
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conn.AddHandler("433", (*Conn).h_433)
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conn.AddHandler("671", (*Conn).h_671)
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}
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