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