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|
package main
import (
"crypto/tls"
"crypto/x509"
"encoding/xml"
"log"
"reflect"
)
type XmppEvent uint8
const (
XmppDisconnect XmppEvent = iota
XmppConnect
)
func (l *Limox) xmpp(jid string, pwd string) {
log.Printf("JID: '%s' PWD: '%s'\n", jid, pwd)
domain := domainpart(jid)
log.Printf("Domain: '%s'\n", domain)
roots, err := x509.SystemCertPool()
if err != nil {
l.XmppEvents <- err
return
}
conn, err := tls.Dial("tcp", domain+":"+"5223", &tls.Config{RootCAs: roots})
if err != nil {
l.XmppEvents <- err
return
}
enc := xml.NewEncoder(conn)
receiver := make(chan xml.Token)
termination := make(chan bool)
go func() {
quit := false
dec := xml.NewDecoder(conn)
for {
select {
case <-termination:
quit = true
default:
t, _ := dec.Token()
if t != nil {
receiver <- t
}
}
if quit {
break
}
}
log.Println("Done!")
}()
end := sendStreamStart(enc, jid)
l.XmppEvents <- XmppConnect
var closing bool = false
for {
select {
case ev := <-l.GuiEvents:
switch ev {
case Disconnect:
termination <- true
closing = true
default:
//log.Fatalf("Unknown GuiEvent '%d'!\n", ev)
}
case rx := <-receiver:
logToken(rx, false)
}
if closing {
break
}
}
sendStreamEnd(enc, end)
conn.Close()
l.XmppEvents <- XmppDisconnect
}
func logToken(t xml.Token, isTx bool) {
var prefix string
if isTx {
prefix = "C"
} else {
prefix = "S"
}
switch t.(type) {
case xml.CharData:
log.Printf("%s: [ %v ] %s\n", prefix, reflect.TypeOf(t), t)
default:
log.Printf("%s: [ %v ] %+v\n", prefix, reflect.TypeOf(t), t)
}
}
func sendStreamStart(enc *xml.Encoder, jid string) (xml.EndElement) {
start := xml.StartElement{
xml.Name{"jabber:client", "stream:stream"},
[]xml.Attr{
xml.Attr{xml.Name{"", "from"}, jid},
xml.Attr{xml.Name{"", "to"}, domainpart(jid)},
xml.Attr{xml.Name{"", "version"}, "1.0"},
xml.Attr{xml.Name{"", "xml:lang"}, "en"},
xml.Attr{xml.Name{"", "xmlns:stream"}, "http://etherx.jabber.org/streams"},
},
}
err := enc.EncodeToken(start)
if err != nil {
log.Fatal("Could not encode stream start!")
}
err = enc.Flush()
if err != nil {
log.Fatal("Could not flush XML encoder!")
}
logToken(start, true)
return start.End()
}
func sendStreamEnd(enc *xml.Encoder, end xml.EndElement) {
err := enc.EncodeToken(end)
if err != nil {
log.Fatal("Could not encode stream end!")
}
err = enc.Flush()
if err != nil {
log.Fatal("Could not flush XML encoder!")
}
logToken(end, true)
}
// domainpart extracts the domain name from a JID / XMPP address. See
// https://datatracker.ietf.org/doc/html/rfc7622#section-3.2 for details.
func domainpart(jid string) string {
list := []rune(jid)
for i, v := range list {
if v == '/' {
list = list[:i]
break
}
}
for i, v := range list {
if v == '@' {
list = list[i+1:]
break
}
}
return string(list)
}
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