Detect the "Have no write access to the chat" error from Telegram

telegram/utils.go

@@ -1304,6 +1304,13 @@ func (c *Client) returnMessage(returnJid string, chatID int64, text string, code
 }
 
 func (c *Client) returnError(returnJid string, chatID int64, msg string, err error, code int, isGroupchat bool) {
+	responseError, ok := err.(client.ResponseError)
+	log.Debugf("responseError: %#v", responseError)
+	if ok && responseError.Err != nil {
+		if responseError.Err.Message == "Have no write access to the chat" {
+			code = 403
+		}
+	}
 	c.returnMessage(returnJid, chatID, fmt.Sprintf("%s: %s", msg, err.Error()), code, isGroupchat)
 }
 

xmpp/gateway/gateway.go

@@ -140,6 +140,9 @@ func sendMessageWrapper(to, from, body, subject, id string, component *xmpp.Comp
 		case 400:
 			message.Error.Type = stanza.ErrorTypeModify
 			message.Error.Reason = "bad-request"
+		case 403:
+			message.Error.Type = stanza.ErrorTypeAuth
+			message.Error.Reason = "forbidden"
 		case 404:
 			message.Error.Type = stanza.ErrorTypeCancel
 			message.Error.Reason = "item-not-found"