separate frontend repository

util/common/random.go

@@ -0,0 +1,30 @@
+package common
+
+import (
+	"math/rand"
+	"time"
+)
+
+var (
+	allSeq []rune
+	rnd    = rand.New(rand.NewSource(time.Now().UnixNano()))
+)
+
+func init() {
+	chars := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+	for _, char := range chars {
+		allSeq = append(allSeq, char)
+	}
+}
+
+func Random(n int) string {
+	runes := make([]rune, n)
+	for i := 0; i < n; i++ {
+		runes[i] = allSeq[rnd.Intn(len(allSeq))]
+	}
+	return string(runes)
+}
+
+func RandomInt(n int) int {
+	return rnd.Intn(n)
+}