From e2451e147ab121ba759c5b1b76838541f0a07947 Mon Sep 17 00:00:00 2001
From: axenteoctavian <axente.octavian@gmail.com>
Date: Tue, 19 Nov 2024 10:24:58 +0200
Subject: [PATCH] token random seq correct validity check

---
 data/esdt/common.go      | 20 +++++++++++++++++++-
 data/esdt/common_test.go | 10 +++++-----
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/data/esdt/common.go b/data/esdt/common.go
index d2467ec4..7d240b51 100644
--- a/data/esdt/common.go
+++ b/data/esdt/common.go
@@ -35,7 +35,7 @@ func IsValidPrefixedToken(token string) (string, bool) {
 	}
 
 	tokenRandSeq := tokenSplit[2]
-	if !(len(tokenRandSeq) >= esdtTickerNumRandChars) {
+	if !IsRandomSeqValid(tokenRandSeq) {
 		return "", false
 	}
 
@@ -83,3 +83,21 @@ func IsTickerValid(ticker string) bool {
 func IsTokenTickerLenCorrect(tokenTickerLen int) bool {
 	return !(tokenTickerLen < minLengthForTickerName || tokenTickerLen > maxLengthForTickerName)
 }
+
+// IsRandomSeqValid checks if the token random sequence is valid
+func IsRandomSeqValid(randomSeq string) bool {
+	if len(randomSeq) != esdtTickerNumRandChars {
+		return false
+	}
+
+	for _, ch := range randomSeq {
+		isSmallCharacter := ch >= 'a' && ch <= 'f'
+		isNumber := ch >= '0' && ch <= '9'
+		isReadable := isSmallCharacter || isNumber
+		if !isReadable {
+			return false
+		}
+	}
+
+	return true
+}
diff --git a/data/esdt/common_test.go b/data/esdt/common_test.go
index 8052c23a..0e65fd9d 100644
--- a/data/esdt/common_test.go
+++ b/data/esdt/common_test.go
@@ -7,19 +7,19 @@ import (
 )
 
 func TestIsValidPrefixedToken(t *testing.T) {
-	prefix, valid := IsValidPrefixedToken("sov1-TKN-coffee")
+	prefix, valid := IsValidPrefixedToken("sov1-TKN-c0ffee")
 	require.True(t, valid)
 	require.Equal(t, "sov1", prefix)
 
-	prefix, valid = IsValidPrefixedToken("sOv1-TKN-coffee")
+	prefix, valid = IsValidPrefixedToken("sOv1-TKN-c0ffee")
 	require.False(t, valid)
 	require.Equal(t, "", prefix)
 
-	prefix, valid = IsValidPrefixedToken("sov1-TkN-coffee")
+	prefix, valid = IsValidPrefixedToken("sov1-TkN-c0ffee")
 	require.False(t, valid)
 	require.Equal(t, "", prefix)
 
-	prefix, valid = IsValidPrefixedToken("sov1-TKN-coffe")
+	prefix, valid = IsValidPrefixedToken("sov1-TKN-c0ffe")
 	require.False(t, valid)
 	require.Equal(t, "", prefix)
 
@@ -27,7 +27,7 @@ func TestIsValidPrefixedToken(t *testing.T) {
 	require.False(t, valid)
 	require.Equal(t, "", prefix)
 
-	prefix, valid = IsValidPrefixedToken("TKN-coffee")
+	prefix, valid = IsValidPrefixedToken("TKN-c0ffee")
 	require.False(t, valid)
 	require.Equal(t, "", prefix)
 }