Converting between Nadeo account ID and encoded game logins

gamelogin.go

package main

import (
	"encoding/base64"
	"encoding/hex"
	"regexp"
	"strings"
)

func isUUID(id string) bool {
	matched, _ := regexp.MatchString("^[A-Fa-f0-9]{8}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{12}$", id)
	return matched
}

func isGameLogin(id string) bool {
	matched, _ := regexp.MatchString("^[a-zA-Z0-9\\-_]{22}$", id)
	return matched
}

func accountIDToLogin(accountID string) string {
	if !isUUID(accountID) {
		return ""
	}

	bytes, err := hex.DecodeString(strings.ReplaceAll(accountID, "-", ""))
	if err != nil {
		return ""
	}

	return base64.RawURLEncoding.EncodeToString(bytes)
}

func loginToAccountID(login string) string {
	if !isGameLogin(login) {
		return ""
	}

	bytes, err := base64.RawURLEncoding.DecodeString(login)
	if err != nil {
		return ""
	}

	ret := hex.EncodeToString(bytes)
	return ret[:8] + "-" + ret[8:12] + "-" + ret[12:16] + "-" + ret[16:20] + "-" + ret[20:]
}