add sort dep and parser.Reverse()

frontend/service.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"regexp"
+	"sort"
 	"strconv"
 	"strings"
 	"time"

parser/util.go

@@ -0,0 +1,14 @@
+// Copyright (c) 2019-2020 The Hush developers
+// Copyright (c) 2019-2020 The Zcash developers
+
+package parser
+
+// Reverse the given byte slice, returning a slice pointing to new data;
+// the input slice is unchanged.
+func Reverse(a []byte) []byte {
+	r := make([]byte, len(a), len(a))
+	for left, right := 0, len(a)-1; left <= right; left, right = left+1, right-1 {
+		r[left], r[right] = a[right], a[left]
+	}
+	return r
+}