问如何以restful的方式将来自Node.js的私有文件夹中的图像提供给网站/应用程序？

EN

app.get('/user/:uid/photos/:file', function (req, res) {
  var uid = req.params.uid
  var file = req.params.file

  req.user.mayViewFilesFrom(uid, function (yes) {
    if (yes) {
      res.sendFile('/uploads/' + uid + '/' + file)
    } else {
      res.status(403).send("Sorry! You can't see that.")
    }
  })
})

  var fs = require('fs')
    
    function(req, res) {
      var id = req.param('id')
      fs.exists('/private/img/'+id, function(exists) {
        if(exists) res.sendfile('/private/img/'+id)
        else res.end('err')
      })
    }