上传文件前 Express Multer 验证请求答案

【问题标题】：Express Multer validate request before uploading file上传文件前 Express Multer 验证请求
【发布时间】：2021-02-19 01:18:03
【问题描述】：

我目前正在使用 multer-s3 (https://www.npmjs.com/package/multer-s3) 将单个 csv 文件上传到 S3，我的工作方式是这样的：

var multer = require('multer');
var multerS3 = require('multer-s3');
var AWS = require('aws-sdk');

AWS.config.loadFromPath(...);
var s3 = new AWS.S3(...);

var upload = multer({
  storage: multerS3({
    s3: s3,
    bucket: 'my-bucket',
    metadata: function (req, file, cb) {
      cb(null, {fieldName: file.fieldname});
    },
    key: function (req, file, cb) {
      cb(null, Date.now().toString())
    }
  })
});

然后它是这样路由的：

app.route('/s3upload')
  .post(upload.single('data'), function(req, res) {

    // at this point the file is already uploaded to S3 
    // and I need to validate the token in the request.

    let s3Key = req.file.key;

  });

我的问题是，如何在 Multer 将我的文件上传到 S3 之前验证请求对象。

【问题讨论】：

标签： node.js express multer multer-s3

【解决方案1】：

您可以在上传之前再链接一个中间件，然后可以在那里检查令牌

function checkToken(req, res) {
    // Logic to validate token
}

app.route('/s3upload')
  .post(checkToken, upload.single('data'), function(req, res) {

    // at this point the file is already uploaded to S3 
    // and I need to validate the token in the request.

    let s3Key = req.file.key;

  });

【讨论】：

【解决方案2】：

只是用于验证的另一层。您可以使用 Joi 来验证您的请求。保存数据之前。

//router.ts
router.post('/', Upload.single('image'), ProductController.create);

//controller.ts
export const create = async(req:Request,res:Response) => {

   const image = (req.file as any).location;
   const body = { ...req.body, image: image }

   const { error } = validate(body);
   if (error) return res.status(400).send(error.details[0].message);

   const product = await ProductService.create(body);

   res.status(201).send(product); 
}

//product.ts 
function validateProduct(product : object) {
  const schema = Joi.object({
      name: Joi.string().min(5).max(50).required(),
      brand: Joi.string().min(5).max(50).required(),
      image: Joi.string().required(),
      price: Joi.number().required(),
      quantity:Joi.number(),
      description: Joi.string(),
  });

  return schema.validate(product);  
}

【讨论】：