Initial QSfera import

Server/vendor/github.com/gookit/goutil/strutil/random_nonwin.go

@@ -0,0 +1,27 @@
+//go:build !windows
+
+package strutil
+
+import (
+	"math/rand"
+	"time"
+)
+
+var rn = newRand()
+
+func newRand() *rand.Rand {
+	return rand.New(rand.NewSource(time.Now().UnixNano()))
+}
+
+// buildRandomString 生成随机字符串
+func buildRandomString(letters string, length int) string {
+	// rn := newRand()
+	cs := make([]byte, length)
+
+	lettersN := len(letters)
+	for i := 0; i < length; i++ {
+		cs[i] = letters[rn.Intn(lettersN)]
+	}
+
+	return Byte2str(cs)
+}