added generate code

rsutils/rsutils.go

@@ -46,6 +46,25 @@ func GenerateSession() (string, error) {
 	return string(r), nil
 }
 
+func GenerateCode(codeLength int) (string, error) {
+	var letters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+
+	r := make([]byte, codeLength)
+
+	for i := 0; i < codeLength; i++ {
+		num, err := rand.Int(rand.Reader, big.NewInt(int64(len(letters))))
+
+		if err != nil {
+			log.Error().Msgf("Failed to session: %v", err)
+			return "", err
+		}
+
+		r[i] = letters[num.Int64()]
+	}
+
+	return string(r), nil
+}
+
 func ParamsParserHelper(c *fiber.Ctx, params interface{}) error {
 	if err := c.ParamsParser(params); err != nil {
 		log.Error().Msgf("Failed to parse params, err: %s", err.Error())