From 62a17dd6584009cad58fceee6b1ada74edf1d38f Mon Sep 17 00:00:00 2001
From: xengineering <me@xengineering.eu>
Date: Fri, 30 Jun 2023 14:32:58 +0200
Subject: Implement resource binding request

This is the first step of resource binding which is a mandatory part of
establishing an XMPP connection.
---
 xmpp/jid.go         | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 xmpp/stream_pair.go |  2 +-
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/xmpp/jid.go b/xmpp/jid.go
index d7107d4..138744c 100644
--- a/xmpp/jid.go
+++ b/xmpp/jid.go
@@ -2,6 +2,9 @@ package xmpp
 
 import (
 	"encoding/xml"
+	"log"
+	"fmt"
+	"math/rand"
 )
 
 // domainpart extracts the domain name from a JID / XMPP address. See
@@ -52,3 +55,46 @@ func hasBind(e []xml.Token) bool {
 
 	return false
 }
+
+func (s *session) sendBind() {
+	iqStart := xml.StartElement{
+		xml.Name{"jabber:client", "iq"},
+		[]xml.Attr{
+			xml.Attr{xml.Name{"", "id"}, fmt.Sprintf("%016x", rand.Uint64())},
+			xml.Attr{xml.Name{"", "type"}, "set"},
+		},
+	}
+	iqEnd := iqStart.End()
+
+	bindStart := xml.StartElement{
+		xml.Name{"urn:ietf:params:xml:ns:xmpp-bind", "bind"},
+		[]xml.Attr{},
+	}
+	bindEnd := bindStart.End()
+
+	resourceStart := xml.StartElement{
+		xml.Name{"", "resource"},
+		[]xml.Attr{},
+	}
+	resourceEnd := resourceStart.End()
+
+	name := xml.CharData("limox-" + fmt.Sprintf("%08x", rand.Uint32()))
+
+	tokens := [...]xml.Token{
+		iqStart,
+		bindStart,
+		resourceStart,
+		name,
+		resourceEnd,
+		bindEnd,
+		iqEnd,
+	}
+
+	for _, v := range tokens {
+		err := s.ed.encodeToken(v)
+		if err != nil {
+			log.Println("Could not encode ressource binding!")
+			return
+		}
+	}
+}
diff --git a/xmpp/stream_pair.go b/xmpp/stream_pair.go
index 9be880f..4690f57 100644
--- a/xmpp/stream_pair.go
+++ b/xmpp/stream_pair.go
@@ -99,7 +99,7 @@ func streamFeaturesHandler(s *session, e []xml.Token) {
 	}
 
 	if hasBind(e) {
-		log.Println("Stream supports ressource binding")
+		s.sendBind()
 		return
 	}
 
-- 
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