Abnormal keyboard callback data

[bokuore]

set property of button with constant string "nav_merchant", but invisible character 'FF' insert in string when handling callback.

code like:

const uniqueNavMerchant = "nav_merchant"
...
//create button with data callback
btnMerchant := guideMenu.Data("Merchant", uniqueNavMerchant)

...
// handle callback
func (nav *Navigation) onCallback(c telebot.Context) (err error) {
	var callback = c.Callback()
...
	if callback.Data == uniqueNavMerchant {
                //should go here
		log.Printf("merchant menu")
		return nav.onMerchantMenu(c)
	} else {
                // but run to here
		log.Printf("[%s/%d] not equal [%s/%d]",
			data, len(data),
			uniqueNavMerchant, len(uniqueNavMerchant))
	}

above log output like this, same text but different length
[nav_merchant/13] not equal [nav_merchant/12]

when copy this log to text editor, this a abnormal at head of string

same problem to context.Callback().Data and context.Data()

[cyrillus31]

What I've just noticed with InlineKeyboard callbacks is that somehow in my case c.Context().Data contains both unique button identifier and button data divided by pipe ("|") symbol and preceded by some whitespace characters I didn't care to define. Here's an example of how you can work around it:

	bot.Handle(tele.OnCallback, func(ctx tele.Context) error {
		callback := ctx.Callback()
		if data := strings.Split(callback.Data, "|")[1]; strings.TrimSpace(data) == "someDataToCheckFor" {
			return ctx.Respond(&tele.CallbackResponse{Text: "some response"})
		}
		return nil
	})