Add utility functions from hub

extras/util/strings.go

@@ -1,6 +1,11 @@
 package util
 
-import "strings"
+import (
+	"encoding/hex"
+	"golang.org/x/text/cases"
+	"golang.org/x/text/unicode/norm"
+	"strings"
+)
 
 func StringSplitArg(stringToSplit, separator string) []interface{} {
 	split := strings.Split(stringToSplit, separator)
@@ -10,3 +15,43 @@ func StringSplitArg(stringToSplit, separator string) []interface{} {
 	}
 	return splitInterface
 }
+
+func Normalize(s string) string {
+	c := cases.Fold()
+	return c.String(norm.NFD.String(s))
+}
+
+func ReverseBytes(s []byte) {
+	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
+		s[i], s[j] = s[j], s[i]
+	}
+}
+
+// convert txid to txHash
+func ToHash(txid string) []byte {
+	t, err := hex.DecodeString(txid)
+	if err != nil {
+		return nil
+	}
+
+	// reverse the bytes. thanks, Satoshi 😒
+	for i, j := 0, len(t)-1; i < j; i, j = i+1, j-1 {
+		t[i], t[j] = t[j], t[i]
+	}
+
+	return t
+}
+
+// convert txHash to txid
+func FromHash(txHash []byte) string {
+	t := make([]byte, len(txHash))
+	copy(t, txHash)
+
+	// reverse the bytes. thanks, Satoshi 😒
+	for i, j := 0, len(txHash)-1; i < j; i, j = i+1, j-1 {
+		txHash[i], txHash[j] = txHash[j], txHash[i]
+	}
+
+	return hex.EncodeToString(t)
+
+}