Warn about undelivered carbons to foreign servers

telegabber.go

@@ -15,7 +15,7 @@ import (
 	goxmpp "gosrc.io/xmpp"
 )
 
-var version string = "1.5.0-dev"
+var version string = "1.5.0"
 var commit string
 
 var sm *goxmpp.StreamManager

xmpp/handlers.go

@@ -168,6 +168,15 @@ func HandleMessage(s xmpp.Sender, p stanza.Packet) {
 
 	if msg.Type == "error" {
 		log.Errorf("MESSAGE ERROR: %#v", p)
+
+		if msg.XMLName.Space == "jabber:component:accept" && msg.Error.Code == 401 {
+			suffix := "@" + msg.From
+			for bare := range sessions {
+				if strings.HasSuffix(bare, suffix) {
+					gateway.SendServiceMessage(bare, "Your server \"" + msg.From + "\" does not allow to send carbons", component)
+				}
+			}
+		}
 	}
 }