mirror of
https://github.com/42wim/matterbridge.git
synced 2024-11-15 08:29:25 +01:00
376 lines
10 KiB
Go
376 lines
10 KiB
Go
package birc
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import (
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"crypto/tls"
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"fmt"
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"hash/crc32"
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"io/ioutil"
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"net"
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"sort"
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"strconv"
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"strings"
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"time"
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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/lrstanley/girc"
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stripmd "github.com/writeas/go-strip-markdown"
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// We need to import the 'data' package as an implicit dependency.
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// See: https://godoc.org/github.com/paulrosania/go-charset/charset
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_ "github.com/paulrosania/go-charset/data"
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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 error
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Local chan config.Message // local queue for flood control
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FirstConnection, authDone bool
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MessageDelay, MessageQueue, MessageLength int
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channels map[string]bool
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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 error)
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b.channels = make(map[string]bool)
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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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if msg.Text == "!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) //nolint:errcheck
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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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i, err := b.getClient()
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if err != nil {
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return err
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}
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if b.GetBool("UseSASL") {
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i.Config.SASL = &girc.SASLPlain{
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User: b.GetString("NickServNick"),
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Pass: b.GetString("NickServPassword"),
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}
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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.ERR_NOMOTD, b.handleOtherAuth)
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i.Handlers.Add(girc.ALL_EVENTS, b.handleOther)
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b.i = i
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go b.doConnect()
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err = <-b.connected
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if err != nil {
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return fmt.Errorf("connection failed %s", err)
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}
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b.Log.Info("Connection succeeded")
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b.FirstConnection = 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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b.channels[channel.Name] = true
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// need to check if we have nickserv auth done before joining channels
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for {
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if b.authDone {
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break
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}
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time.Sleep(time.Second)
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}
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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.EventMsgDelete {
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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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return "", nil
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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 err := b.handleCharset(&msg); err != nil {
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return "", err
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}
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// handle files, return if we're done here
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if ok := b.handleFiles(&msg); ok {
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return "", nil
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}
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var msgLines []string
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if b.GetBool("StripMarkdown") {
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msg.Text = stripmd.Strip(msg.Text)
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}
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if b.GetBool("MessageSplit") {
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msgLines = helper.GetSubLines(msg.Text, b.MessageLength, b.GetString("MessageClipped"))
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} else {
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msgLines = helper.GetSubLines(msg.Text, 0, b.GetString("MessageClipped"))
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}
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for i := range msgLines {
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if len(b.Local) >= b.MessageQueue {
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b.Log.Debugf("flooding, dropping message (queue at %d)", len(b.Local))
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return "", nil
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}
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msg.Text = msgLines[i]
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b.Local <- msg
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}
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return "", nil
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}
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func (b *Birc) doConnect() {
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for {
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if err := b.i.Connect(); err != nil {
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b.Log.Errorf("disconnect: error: %s", err)
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if b.FirstConnection {
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b.connected <- err
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return
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}
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} else {
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b.Log.Info("disconnect: client requested quit")
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}
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b.Log.Info("reconnecting in 30 seconds...")
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time.Sleep(30 * time.Second)
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b.i.Handlers.Clear(girc.RPL_WELCOME)
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b.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.EventRejoinChannels}
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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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}
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}
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// Sanitize nicks for RELAYMSG: replace IRC characters with special meanings with "-"
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func sanitizeNick(nick string) string {
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sanitize := func(r rune) rune {
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if strings.ContainsRune("!+%@&#$:'\"?*,. ", r) {
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return '-'
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}
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return r
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}
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return strings.Map(sanitize, nick)
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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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// Optional support for the proposed RELAYMSG extension, described at
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// https://github.com/jlu5/ircv3-specifications/blob/master/extensions/relaymsg.md
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// nolint:nestif
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if (b.i.HasCapability("overdrivenetworks.com/relaymsg") || b.i.HasCapability("draft/relaymsg")) &&
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b.GetBool("UseRelayMsg") {
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username = sanitizeNick(username)
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text := msg.Text
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// Work around girc chomping leading commas on single word messages?
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if strings.HasPrefix(text, ":") && !strings.ContainsRune(text, ' ') {
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text = ":" + text
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}
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if msg.Event == config.EventUserAction {
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b.i.Cmd.SendRawf("RELAYMSG %s %s :\x01ACTION %s\x01", msg.Channel, username, text) //nolint:errcheck
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} else {
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b.Log.Debugf("Sending RELAYMSG to channel %s: nick=%s", msg.Channel, username)
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b.i.Cmd.SendRawf("RELAYMSG %s %s :%s", msg.Channel, username, text) //nolint:errcheck
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}
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} else {
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if b.GetBool("Colornicks") {
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checksum := crc32.ChecksumIEEE([]byte(msg.Username))
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colorCode := checksum%14 + 2 // quick fix - prevent white or black color codes
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username = fmt.Sprintf("\x03%02d%s\x0F", colorCode, msg.Username)
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}
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switch msg.Event {
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case config.EventUserAction:
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b.i.Cmd.Action(msg.Channel, username+msg.Text)
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case config.EventNoticeIRC:
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b.Log.Debugf("Sending notice to channel %s", msg.Channel)
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b.i.Cmd.Notice(msg.Channel, username+msg.Text)
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default:
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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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}
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// validateInput validates the server/port/nick configuration. Returns a *girc.Client if successful
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func (b *Birc) getClient() (*girc.Client, error) {
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server, portstr, err := net.SplitHostPort(b.GetString("Server"))
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if err != nil {
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return nil, 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 nil, 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 || len(user) == 0 {
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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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debug := ioutil.Discard
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if b.GetInt("DebugLevel") == 2 {
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debug = b.Log.Writer()
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}
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pingDelay, err := time.ParseDuration(b.GetString("pingdelay"))
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if err != nil || pingDelay == 0 {
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pingDelay = time.Minute
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}
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b.Log.Debugf("setting pingdelay to %s", pingDelay)
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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}, //nolint:gosec
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PingDelay: pingDelay,
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// skip gIRC internal rate limiting, since we have our own throttling
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AllowFlood: true,
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Debug: debug,
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SupportedCaps: map[string][]string{"overdrivenetworks.com/relaymsg": nil, "draft/relaymsg": nil},
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})
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return i, nil
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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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for len(b.names[channel]) > maxNamesPerPost {
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b.Remote <- config.Message{
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Username: b.Nick, Text: b.formatnicks(b.names[channel][0:maxNamesPerPost]),
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Channel: channel, Account: b.Account,
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}
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b.names[channel] = b.names[channel][maxNamesPerPost:]
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}
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b.Remote <- config.Message{
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Username: b.Nick, Text: b.formatnicks(b.names[channel]),
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Channel: channel, Account: b.Account,
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}
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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) 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" && len(event.Params) != 2 {
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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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// don't forward messages we sent via RELAYMSG
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if relayedNick, ok := event.Tags.Get("draft/relaymsg"); ok && relayedNick == b.Nick {
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return true
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}
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// This is the old name of the cap sent in spoofed messages; I've kept this in
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// for compatibility reasons
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if relayedNick, ok := event.Tags.Get("relaymsg"); ok && relayedNick == 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) 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.Last()), " ")...)
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}
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func (b *Birc) formatnicks(nicks []string) string {
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return strings.Join(nicks, ", ") + " currently on IRC"
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}
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