463 lines
14 KiB
Go
463 lines
14 KiB
Go
package birc
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import (
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"bytes"
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"crypto/tls"
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"fmt"
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"github.com/42wim/matterbridge/bridge"
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"github.com/42wim/matterbridge/bridge/config"
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"github.com/42wim/matterbridge/bridge/helper"
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"github.com/dfordsoft/golib/ic"
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"github.com/lrstanley/girc"
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"github.com/paulrosania/go-charset/charset"
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_ "github.com/paulrosania/go-charset/data"
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"github.com/saintfish/chardet"
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"hash/crc32"
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"io"
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"io/ioutil"
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"net"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"time"
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"unicode/utf8"
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)
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type Birc struct {
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i *girc.Client
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Nick string
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names map[string][]string
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connected chan struct{}
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Local chan config.Message // local queue for flood control
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FirstConnection bool
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MessageDelay, MessageQueue, MessageLength int
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*bridge.Config
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}
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func New(cfg *bridge.Config) bridge.Bridger {
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b := &Birc{}
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b.Config = cfg
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b.Nick = b.GetString("Nick")
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b.names = make(map[string][]string)
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b.connected = make(chan struct{})
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if b.GetInt("MessageDelay") == 0 {
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b.MessageDelay = 1300
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} else {
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b.MessageDelay = b.GetInt("MessageDelay")
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}
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if b.GetInt("MessageQueue") == 0 {
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b.MessageQueue = 30
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} else {
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b.MessageQueue = b.GetInt("MessageQueue")
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}
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if b.GetInt("MessageLength") == 0 {
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b.MessageLength = 400
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} else {
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b.MessageLength = b.GetInt("MessageLength")
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}
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b.FirstConnection = true
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return b
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}
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func (b *Birc) Command(msg *config.Message) string {
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switch msg.Text {
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case "!users":
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b.i.Handlers.Add(girc.RPL_NAMREPLY, b.storeNames)
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b.i.Handlers.Add(girc.RPL_ENDOFNAMES, b.endNames)
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b.i.Cmd.SendRaw("NAMES " + msg.Channel)
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}
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return ""
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}
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func (b *Birc) Connect() error {
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b.Local = make(chan config.Message, b.MessageQueue+10)
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b.Log.Infof("Connecting %s", b.GetString("Server"))
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server, portstr, err := net.SplitHostPort(b.GetString("Server"))
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if err != nil {
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return err
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}
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port, err := strconv.Atoi(portstr)
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if err != nil {
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return err
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}
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// fix strict user handling of girc
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user := b.GetString("Nick")
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for !girc.IsValidUser(user) {
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if len(user) == 1 {
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user = "matterbridge"
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break
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}
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user = user[1:]
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}
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i := girc.New(girc.Config{
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Server: server,
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ServerPass: b.GetString("Password"),
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Port: port,
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Nick: b.GetString("Nick"),
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User: user,
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Name: b.GetString("Nick"),
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SSL: b.GetBool("UseTLS"),
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TLSConfig: &tls.Config{InsecureSkipVerify: b.GetBool("SkipTLSVerify"), ServerName: server},
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PingDelay: time.Minute,
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})
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if b.GetBool("UseSASL") {
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i.Config.SASL = &girc.SASLPlain{b.GetString("NickServNick"), b.GetString("NickServPassword")}
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}
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i.Handlers.Add(girc.RPL_WELCOME, b.handleNewConnection)
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i.Handlers.Add(girc.RPL_ENDOFMOTD, b.handleOtherAuth)
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i.Handlers.Add(girc.ALL_EVENTS, b.handleOther)
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go func() {
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for {
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if err := i.Connect(); err != nil {
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b.Log.Errorf("error: %s", err)
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b.Log.Info("reconnecting in 30 seconds...")
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time.Sleep(30 * time.Second)
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i.Handlers.Clear(girc.RPL_WELCOME)
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i.Handlers.Add(girc.RPL_WELCOME, func(client *girc.Client, event girc.Event) {
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b.Remote <- config.Message{Username: "system", Text: "rejoin", Channel: "", Account: b.Account, Event: config.EVENT_REJOIN_CHANNELS}
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// set our correct nick on reconnect if necessary
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b.Nick = event.Source.Name
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})
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} else {
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return
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}
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}
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}()
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b.i = i
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select {
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case <-b.connected:
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b.Log.Info("Connection succeeded")
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case <-time.After(time.Second * 30):
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return fmt.Errorf("connection timed out")
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}
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//i.Debug = false
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if b.GetInt("DebugLevel") == 0 {
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i.Handlers.Clear(girc.ALL_EVENTS)
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}
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go b.doSend()
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return nil
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}
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func (b *Birc) Disconnect() error {
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b.i.Close()
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close(b.Local)
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return nil
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}
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func (b *Birc) JoinChannel(channel config.ChannelInfo) error {
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if channel.Options.Key != "" {
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b.Log.Debugf("using key %s for channel %s", channel.Options.Key, channel.Name)
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b.i.Cmd.JoinKey(channel.Name, channel.Options.Key)
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} else {
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b.i.Cmd.Join(channel.Name)
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}
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return nil
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}
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func (b *Birc) Send(msg config.Message) (string, error) {
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// ignore delete messages
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if msg.Event == config.EVENT_MSG_DELETE {
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return "", nil
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}
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b.Log.Debugf("=> Receiving %#v", msg)
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// we can be in between reconnects #385
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if !b.i.IsConnected() {
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b.Log.Error("Not connected to server, dropping message")
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}
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// Execute a command
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if strings.HasPrefix(msg.Text, "!") {
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b.Command(&msg)
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}
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// convert to specified charset
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if b.GetString("Charset") != "" {
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switch b.GetString("Charset") {
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case "gbk", "gb18030", "gb2312", "big5", "euc-kr", "euc-jp", "shift-jis", "iso-2022-jp":
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msg.Text = ic.ConvertString("utf-8", b.GetString("Charset"), msg.Text)
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default:
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buf := new(bytes.Buffer)
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w, err := charset.NewWriter(b.GetString("Charset"), buf)
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if err != nil {
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b.Log.Errorf("charset from utf-8 conversion failed: %s", err)
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return "", err
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}
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fmt.Fprint(w, msg.Text)
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w.Close()
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msg.Text = buf.String()
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}
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}
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// Handle files
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if msg.Extra != nil {
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for _, rmsg := range helper.HandleExtra(&msg, b.General) {
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b.Local <- rmsg
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}
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if len(msg.Extra["file"]) > 0 {
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for _, f := range msg.Extra["file"] {
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fi := f.(config.FileInfo)
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if fi.Comment != "" {
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msg.Text += fi.Comment + ": "
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}
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if fi.URL != "" {
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msg.Text = fi.URL
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if fi.Comment != "" {
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msg.Text = fi.Comment + ": " + fi.URL
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}
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}
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b.Local <- config.Message{Text: msg.Text, Username: msg.Username, Channel: msg.Channel, Event: msg.Event}
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}
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return "", nil
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}
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}
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// split long messages on messageLength, to avoid clipped messages #281
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if b.GetBool("MessageSplit") {
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msg.Text = helper.SplitStringLength(msg.Text, b.MessageLength)
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}
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for _, text := range strings.Split(msg.Text, "\n") {
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if len(text) > b.MessageLength {
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text = text[:b.MessageLength-len(" <message clipped>")]
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if r, size := utf8.DecodeLastRuneInString(text); r == utf8.RuneError {
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text = text[:len(text)-size]
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}
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text += " <message clipped>"
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}
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if len(b.Local) < b.MessageQueue {
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if len(b.Local) == b.MessageQueue-1 {
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text = text + " <message clipped>"
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}
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b.Local <- config.Message{Text: text, Username: msg.Username, Channel: msg.Channel, Event: msg.Event}
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} else {
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b.Log.Debugf("flooding, dropping message (queue at %d)", len(b.Local))
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}
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}
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return "", nil
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}
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func (b *Birc) doSend() {
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rate := time.Millisecond * time.Duration(b.MessageDelay)
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throttle := time.NewTicker(rate)
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for msg := range b.Local {
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<-throttle.C
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username := msg.Username
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if b.GetBool("Colornicks") {
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checksum := crc32.ChecksumIEEE([]byte(msg.Username))
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username = fmt.Sprintf("\x03%02d%s\x0F", checksum%0x10, msg.Username)
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}
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if msg.Event == config.EVENT_USER_ACTION {
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b.i.Cmd.Action(msg.Channel, username+msg.Text)
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} else {
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b.Log.Debugf("Sending to channel %s", msg.Channel)
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b.i.Cmd.Message(msg.Channel, username+msg.Text)
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}
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}
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}
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func (b *Birc) endNames(client *girc.Client, event girc.Event) {
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channel := event.Params[1]
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sort.Strings(b.names[channel])
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maxNamesPerPost := (300 / b.nicksPerRow()) * b.nicksPerRow()
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continued := false
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for len(b.names[channel]) > maxNamesPerPost {
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b.Remote <- config.Message{Username: b.Nick, Text: b.formatnicks(b.names[channel][0:maxNamesPerPost], continued),
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Channel: channel, Account: b.Account}
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b.names[channel] = b.names[channel][maxNamesPerPost:]
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continued = true
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}
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b.Remote <- config.Message{Username: b.Nick, Text: b.formatnicks(b.names[channel], continued),
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Channel: channel, Account: b.Account}
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b.names[channel] = nil
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b.i.Handlers.Clear(girc.RPL_NAMREPLY)
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b.i.Handlers.Clear(girc.RPL_ENDOFNAMES)
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}
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func (b *Birc) handleNewConnection(client *girc.Client, event girc.Event) {
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b.Log.Debug("Registering callbacks")
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i := b.i
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b.Nick = event.Params[0]
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i.Handlers.Add(girc.RPL_ENDOFMOTD, b.handleOtherAuth)
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i.Handlers.Add("PRIVMSG", b.handlePrivMsg)
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i.Handlers.Add("CTCP_ACTION", b.handlePrivMsg)
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i.Handlers.Add(girc.RPL_TOPICWHOTIME, b.handleTopicWhoTime)
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i.Handlers.Add(girc.NOTICE, b.handleNotice)
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i.Handlers.Add("JOIN", b.handleJoinPart)
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i.Handlers.Add("PART", b.handleJoinPart)
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i.Handlers.Add("QUIT", b.handleJoinPart)
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i.Handlers.Add("KICK", b.handleJoinPart)
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// we are now fully connected
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b.connected <- struct{}{}
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}
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func (b *Birc) handleJoinPart(client *girc.Client, event girc.Event) {
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if len(event.Params) == 0 {
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b.Log.Debugf("handleJoinPart: empty Params? %#v", event)
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return
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}
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channel := strings.ToLower(event.Params[0])
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if event.Command == "KICK" {
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b.Log.Infof("Got kicked from %s by %s", channel, event.Source.Name)
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time.Sleep(time.Duration(b.GetInt("RejoinDelay")) * time.Second)
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b.Remote <- config.Message{Username: "system", Text: "rejoin", Channel: channel, Account: b.Account, Event: config.EVENT_REJOIN_CHANNELS}
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return
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}
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if event.Command == "QUIT" {
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if event.Source.Name == b.Nick && strings.Contains(event.Trailing, "Ping timeout") {
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b.Log.Infof("%s reconnecting ..", b.Account)
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b.Remote <- config.Message{Username: "system", Text: "reconnect", Channel: channel, Account: b.Account, Event: config.EVENT_FAILURE}
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return
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}
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}
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if event.Source.Name != b.Nick {
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if b.GetBool("nosendjoinpart") {
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return
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}
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b.Log.Debugf("<= Sending JOIN_LEAVE event from %s to gateway", b.Account)
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msg := config.Message{Username: "system", Text: event.Source.Name + " " + strings.ToLower(event.Command) + "s", Channel: channel, Account: b.Account, Event: config.EVENT_JOIN_LEAVE}
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b.Log.Debugf("<= Message is %#v", msg)
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b.Remote <- msg
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return
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}
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b.Log.Debugf("handle %#v", event)
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}
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func (b *Birc) handleNotice(client *girc.Client, event girc.Event) {
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if strings.Contains(event.String(), "This nickname is registered") && event.Source.Name == b.GetString("NickServNick") {
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b.i.Cmd.Message(b.GetString("NickServNick"), "IDENTIFY "+b.GetString("NickServPassword"))
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} else {
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b.handlePrivMsg(client, event)
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}
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}
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func (b *Birc) handleOther(client *girc.Client, event girc.Event) {
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if b.GetInt("DebugLevel") == 1 {
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if event.Command != "CLIENT_STATE_UPDATED" &&
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event.Command != "CLIENT_GENERAL_UPDATED" {
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b.Log.Debugf("%#v", event.String())
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}
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return
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}
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switch event.Command {
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case "372", "375", "376", "250", "251", "252", "253", "254", "255", "265", "266", "002", "003", "004", "005":
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return
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}
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b.Log.Debugf("%#v", event.String())
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}
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func (b *Birc) handleOtherAuth(client *girc.Client, event girc.Event) {
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if strings.EqualFold(b.GetString("NickServNick"), "Q@CServe.quakenet.org") {
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b.Log.Debugf("Authenticating %s against %s", b.GetString("NickServUsername"), b.GetString("NickServNick"))
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b.i.Cmd.Message(b.GetString("NickServNick"), "AUTH "+b.GetString("NickServUsername")+" "+b.GetString("NickServPassword"))
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}
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}
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func (b *Birc) skipPrivMsg(event girc.Event) bool {
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// Our nick can be changed
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b.Nick = b.i.GetNick()
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// freenode doesn't send 001 as first reply
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if event.Command == "NOTICE" {
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return true
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}
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// don't forward queries to the bot
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if event.Params[0] == b.Nick {
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return true
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}
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// don't forward message from ourself
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if event.Source.Name == b.Nick {
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return true
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}
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return false
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}
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func (b *Birc) handlePrivMsg(client *girc.Client, event girc.Event) {
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if b.skipPrivMsg(event) {
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return
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}
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rmsg := config.Message{Username: event.Source.Name, Channel: strings.ToLower(event.Params[0]), Account: b.Account, UserID: event.Source.Ident + "@" + event.Source.Host}
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b.Log.Debugf("== Receiving PRIVMSG: %s %s %#v", event.Source.Name, event.Trailing, event)
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// set action event
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if event.IsAction() {
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rmsg.Event = config.EVENT_USER_ACTION
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}
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// strip action, we made an event if it was an action
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rmsg.Text += event.StripAction()
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// strip IRC colors
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re := regexp.MustCompile(`[[:cntrl:]](?:\d{1,2}(?:,\d{1,2})?)?`)
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rmsg.Text = re.ReplaceAllString(rmsg.Text, "")
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// start detecting the charset
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var r io.Reader
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var err error
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mycharset := b.GetString("Charset")
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if mycharset == "" {
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// detect what were sending so that we convert it to utf-8
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detector := chardet.NewTextDetector()
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result, err := detector.DetectBest([]byte(rmsg.Text))
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if err != nil {
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b.Log.Infof("detection failed for rmsg.Text: %#v", rmsg.Text)
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return
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}
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b.Log.Debugf("detected %s confidence %#v", result.Charset, result.Confidence)
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mycharset = result.Charset
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// if we're not sure, just pick ISO-8859-1
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if result.Confidence < 80 {
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mycharset = "ISO-8859-1"
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}
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}
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switch mycharset {
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case "gbk", "gb18030", "gb2312", "big5", "euc-kr", "euc-jp", "shift-jis", "iso-2022-jp":
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rmsg.Text = ic.ConvertString("utf-8", b.GetString("Charset"), rmsg.Text)
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default:
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r, err = charset.NewReader(mycharset, strings.NewReader(rmsg.Text))
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if err != nil {
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b.Log.Errorf("charset to utf-8 conversion failed: %s", err)
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return
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}
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output, _ := ioutil.ReadAll(r)
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rmsg.Text = string(output)
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}
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b.Log.Debugf("<= Sending message from %s on %s to gateway", event.Params[0], b.Account)
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b.Remote <- rmsg
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}
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func (b *Birc) handleTopicWhoTime(client *girc.Client, event girc.Event) {
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parts := strings.Split(event.Params[2], "!")
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t, err := strconv.ParseInt(event.Params[3], 10, 64)
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if err != nil {
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b.Log.Errorf("Invalid time stamp: %s", event.Params[3])
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}
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user := parts[0]
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if len(parts) > 1 {
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user += " [" + parts[1] + "]"
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}
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b.Log.Debugf("%s: Topic set by %s [%s]", event.Command, user, time.Unix(t, 0))
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}
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func (b *Birc) nicksPerRow() int {
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return 4
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}
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func (b *Birc) storeNames(client *girc.Client, event girc.Event) {
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channel := event.Params[2]
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b.names[channel] = append(
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b.names[channel],
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strings.Split(strings.TrimSpace(event.Trailing), " ")...)
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}
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func (b *Birc) formatnicks(nicks []string, continued bool) string {
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return plainformatter(nicks, b.nicksPerRow())
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}
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