Implement domain part extraction in Go

This is needed to continue with DNS resolution.

1 files changed, 30 insertions, 0 deletions

diff --git a/go/main.go b/go/main.go
index 18f2105..8bfb1fa 100644
--- a/go/main.go
+++ b/go/main.go
@@ -79,6 +79,7 @@ func (l *Limox) buttonCallback() {
 	switch l.State {
 	case Disconnected:
 		log.Println("Starting connection establishment")
+		go xmpp(l.JidEditor.Text(), l.PwdEditor.Text())
 		l.State = Connecting
 	case Connecting:
 		log.Println("Aborted connection establishment")
@@ -89,6 +90,35 @@ func (l *Limox) buttonCallback() {
 	}
 }
 
+func xmpp(jid string, pwd string) {
+	log.Printf("JID: '%s' PWD: '%s'\n", jid, pwd)
+	log.Printf("Domain: '%s'\n", domainpart(jid))
+}
+
+// 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 == '/' {
+			log.Printf("Index of / rune: %d\n", i)
+			list = list[:i]
+			break
+		}
+	}
+
+	for i, v := range(list) {
+		if v == '@' {
+			log.Printf("Index of @ rune: %d\n", i)
+			list = list[i+1:]
+			break
+		}
+	}
+
+	return string(list)
+}
+
 func (l *Limox) draw(e system.FrameEvent) {
 	gtx := layout.NewContext(&l.Operations, e)