Multer |停止文件上传 [英] Multer | Stop file upload

问题描述

我正在使用expressjs 4.0和multer来处理文件上传。

I am using expressjs 4.0 along with multer to handle file uploads.

问题是，当文件的大小超过maxSize变量时，我想停止文件上传。但是
multer无论如何上传文件。

Problem is, I want to stop file upload when the file's size exceeds a maxSize variable. But multer uploads file anyways.

有没有办法来阻止这种行为。

Is there a way to stop this behaviour.

示例代码：

app.post('/upload', function(req, res) {

    var maxSize = 32 * 1000 * 1000 // 32mb max

    if(req.files.file.length > maxSize) {
        // stop upload
    } else {
        // continue
        res.send(201);
    }
});

推荐答案

根据Multer文档：（ https://www.npmjs.org/package/multer ），您可以使用onFileUploadStart（file），并返回false if大小超过你的极限。

According to Multer documentation: (https://www.npmjs.org/package/multer) you could use onFileUploadStart(file), and return false if the size is above your limit.

例如：

var express = require('express');
var multer  = require('multer');

var maxSize = 32 * 1000 * 1000;

var app = express();
app.use(multer({
  dest: './uploads/',
  onFileUploadStart: function(file, req, res){
    if(req.files.file.length > maxSize) {
      return false;
    }
  })
}));

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