Implement detection of resource binding offer

This allows to trigger resource binding if the stream supports it.

2 files changed, 24 insertions, 0 deletions

diff --git a/xmpp/jid.go b/xmpp/jid.go
index 90c1509..d7107d4 100644
--- a/xmpp/jid.go
+++ b/xmpp/jid.go
@@ -1,5 +1,9 @@
 package xmpp
 
+import (
+	"encoding/xml"
+)
+
 // 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 {
@@ -33,3 +37,18 @@ func username(jid string) string {
 
 	return ""
 }
+
+func hasBind(e []xml.Token) bool {
+	bind := xml.Name{`urn:ietf:params:xml:ns:xmpp-bind`, `bind`}
+
+	for _, v := range e {
+		switch s := v.(type) {
+		case xml.StartElement:
+			if s.Name == bind {
+				return true
+			}
+		}
+	}
+
+	return false
+}
diff --git a/xmpp/stream_pair.go b/xmpp/stream_pair.go
index 693972e..9be880f 100644
--- a/xmpp/stream_pair.go
+++ b/xmpp/stream_pair.go
@@ -98,5 +98,10 @@ func streamFeaturesHandler(s *session, e []xml.Token) {
 		return
 	}
 
+	if hasBind(e) {
+		log.Println("Stream supports ressource binding")
+		return
+	}
+
 	log.Println("Stream has no implemented features!")
 }