chore(virtual): implement the driver interface with result

drivers/virtual/util.go

@@ -0,0 +1,22 @@
+package virtual
+
+import (
+	"time"
+
+	"github.com/alist-org/alist/v3/internal/model"
+	"github.com/alist-org/alist/v3/pkg/utils/random"
+)
+
+func (d *Virtual) genObj(dir bool) model.Obj {
+	obj := &model.Object{
+		Name:     random.String(10),
+		Size:     0,
+		IsFolder: true,
+		Modified: time.Now(),
+	}
+	if !dir {
+		obj.Size = random.RangeInt64(d.MinFileSize, d.MaxFileSize)
+		obj.IsFolder = false
+	}
+	return obj
+}