feat(*): initial commit

internal/util/rand.go

@@ -0,0 +1,15 @@
+package util
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"io"
+)
+
+func RandString(nByte int) (string, error) {
+	b := make([]byte, nByte)
+	if _, err := io.ReadFull(rand.Reader, b); err != nil {
+		return "", err
+	}
+	return base64.RawURLEncoding.EncodeToString(b), nil
+}