如何使用multer和node js确定文件的真实类型而不检查文件扩展名

npm install multer mime-types

const multer = require('multer');
const mime = require('mime-types');

const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, 'uploads/'); // 设置文件存储路径
  },
  filename: function (req, file, cb) {
    const fileExtension = mime.extension(file.mimetype);
    const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
    cb(null, file.fieldname + '-' + uniqueSuffix + '.' + fileExtension); // 设置文件名
  }
});

const upload = multer({ storage: storage });

app.post('/upload', upload.single('file'), function (req, res, next) {
  // 文件上传成功后的处理逻辑
});

app.post('/upload', upload.single('file'), function (req, res, next) {
  const file = req.file;
  console.log('Original Name: ' + file.originalname);
  console.log('Stored Path: ' + file.path);
  console.log('Size: ' + file.size);
  // 其他处理逻辑
});