Update barnard

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
+}

data/esdt/common_test.go

@@ -7,27 +7,27 @@ 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)
 
 	prefix, valid = IsValidPrefixedToken("sov1-TKN")
 	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)
 }