Add disco query responder

xmpp/handlers.go

@@ -35,6 +35,12 @@ func HandleIq(s xmpp.Sender, p stanza.Packet) {
 		_, ok := iq.Payload.(*extensions.IqVcardTemp)
 		if ok {
 			go handleGetVcardTempIq(s, iq)
+			return
+		}
+		_, ok = iq.Payload.(*stanza.DiscoInfo)
+		if ok {
+			go handleGetDiscoInfo(s, iq)
+			return
 		}
 	}
 }
@@ -295,6 +301,33 @@ func handleGetVcardTempIq(s xmpp.Sender, iq *stanza.IQ) {
 	_ = gateway.ResumableSend(component, &answer)
 }
 
+func handleGetDiscoInfo(s xmpp.Sender, iq *stanza.IQ) {
+	answer, err := stanza.NewIQ(stanza.Attrs{
+		Type: stanza.IQTypeResult,
+		From: iq.To,
+		To: iq.From,
+		Id: iq.Id,
+		Lang: "en",
+	})
+	if err != nil {
+		log.Errorf("Failed to create answer IQ: %v", err)
+	}
+
+	disco := answer.DiscoInfo()
+	disco.AddIdentity("Telegram Gateway", "gateway", "telegram")
+	answer.Payload = disco
+
+	log.Debugf("%#v", answer)
+
+	component, ok := s.(*xmpp.Component)
+	if !ok {
+		log.Error("Not a component")
+		return
+	}
+
+	_ = gateway.ResumableSend(component, answer)
+}
+
 func splitFrom(from string) (string, string, bool) {
 	fromJid, err := stanza.NewJid(from)
 	if err != nil {