Make incoming messages to the transport trigger a subscription

xmpp/handlers.go

@@ -71,17 +71,24 @@ func HandleMessage(s xmpp.Sender, p stanza.Packet) {
 			return
 		}
 
+		gatewayJid := gateway.Jid.Bare()
+
 		session, ok := sessions[bare]
 		if !ok {
-			log.Error("Message from stranger")
-			return
+			if msg.To == gatewayJid {
+				gateway.SendPresence(component, msg.From, gateway.SPType("subscribe"))
+				gateway.SendPresence(component, msg.From, gateway.SPType("subscribed"))
+			} else {
+				log.Error("Message from stranger")
+				return
+			}
 		}
 
 		toID, ok := toToID(msg.To)
 		if ok {
 			session.ProcessOutgoingMessage(toID, msg.Body, msg.From)
 			return
-		} else if msg.To == gateway.Jid.Bare() {
+		} else if msg.To == gatewayJid {
 			if strings.HasPrefix(msg.Body, "/") {
 				response := session.ProcessTransportCommand(msg.Body, resource)
 				if response != "" {