feat: user jwt login

pkg/utils/random/random.go

@@ -0,0 +1,23 @@
+package random
+
+import (
+	"math/rand"
+	"time"
+)
+
+var Rand *rand.Rand
+
+const letterBytes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+
+func RandomStr(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letterBytes[Rand.Intn(len(letterBytes))]
+	}
+	return string(b)
+}
+
+func init() {
+	s := rand.NewSource(time.Now().UnixNano())
+	Rand = rand.New(s)
+}