Fixed filename contain two dot cannot open bug

mod/user/directoryHandler.go

@@ -86,7 +86,7 @@ func (u *User) VirtualPathToRealPath(vpath string) (string, error) {
 		return "", err
 	}
 
-	if strings.Contains(filepath.Clean(subpath), "..") {
+	if strings.Contains(filepath.ToSlash(filepath.Clean(subpath)), "../") || filepath.Clean(subpath) == ".." {
 		return "", errors.New("Request path out of storage root")
 	}