node.js - 使用节点从 Amazon S3 下载文件

Question

我有一个 MEAN 堆栈应用程序，我试图让用户下载使用亚马逊 S3 存储的文件。我正在为用户生成一个预签名 URL，但是当我在 Chrome 中转到该 URL 时，我收到以下错误消息

The request signature we calculated does not match the signature you provided. Check your key and signing method.

当我从 Postman 查询节点应用程序时，它会生成一个带有问题的预签名 URL，但显然它不起作用。这是我的相关代码：

var express=require('express');
var S3 = require('aws-sdk/clients/s3');
var router = express.Router();

router.get('/api/downloadURL', (req,res,next) => {
  const s3 = new S3({
    apiVersion: '2006-03-01',
    accessKeyId: process.env.AWS_ACCESS_KEY_ID,
    secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
    signatureVersion: 'v4',
    region: 'us-east-2' // region of my bucket and what it says is expected
  });
  var s3params = {'Bucket': process.env.S3_BUCKET_NAME, 'Key': 'folder1/file.pdf'}
  s3.getSignedUrl('getObject', s3params, function(err, url) {
    if (err) res.json(err);
    res.json(url);
  });
});

当邮递员查询时，我得到以下格式的 URL

https://bucketname.s3.us-east-2.amazonaws.com/folder1/file.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ACCESS_KEY_HERE%2F20180515%2Fus-east-2% 2Fs3%2Faws4_request&X-Amz-Date=20180515T174606Z&X-Amz-Expires=900&X-Amz-Signature=89f6b9a6be699fc1e3268bceaf6585d34ed11e077126ba7c634b769f1add4475&X-Amz-SignedHeaders=

标签： node.jsamazon-web-servicesexpressamazon-s3