NodeJS 如何从 aws s3 存储桶将文件下载到磁盘? [英] NodeJS How do I Download a file to disk from an aws s3 bucket?

问题描述

我的目标:

显示一个对话框，提示用户保存从 aws 下载的文件.

Display a dialog box prompting the user to save a file being downloaded from aws.

我的问题:

我目前正在使用 awssum-amazon-s3 创建下载流.但是，我只设法将文件保存到我的服务器或将其流式传输到命令行...正如您从我的代码中看到的，我的最后一次尝试是尝试手动设置失败的内容处置标头.我不能使用 res.download() 因为标题已经设置了?

I am currently using awssum-amazon-s3 to create a download stream. However I've only managed to save the file to my server or stream it to the command line... As you can see from my code my last attempt was to try and manually set the content disposition headers which failed. I cannot use res.download() as the headers have already been set?

我怎样才能实现我的目标?

How can I achieve my goal?

我的节点代码:

app.post('/dls/:dlKey', function(req, res, next){
        // download the file via aws s3 here
        var dlKey = req.param('dlKey');

        Dl.findOne({key:dlKey}, function(err, dl){
            if (err) return next(err);
            var files = dl.dlFile;

            var options = {
                BucketName    : 'xxxx',
                ObjectName    : files,
            };

            s3.GetObject(options, { stream : true }, function(err, data) {
                // stream this file to stdout
                fmt.sep();
                data.Headers['Content-Disposition'] = 'attachment';
                console.log(data.Headers);
                data.Stream.pipe(fs.createWriteStream('test.pdf'));
                data.Stream.on('end', function() {
                    console.log('File Downloaded!');
                });
            });
        });

        res.end('Successful Download Post!');
    });

我的角度代码:

$scope.dlComplete = function (dl) {
        $scope.procDownload = true;
        $http({
            method: 'POST',
            url: '/dls/' + dl.dlKey
        }).success(function(data/*, status, headers, config*/) {
            console.log(data);
            $location.path('/#!/success');
        }).error(function(/*data, status, headers, config*/) {
            console.log('File download failed!');
        });
    };

这段代码的目的是让用户使用生成的密钥下载文件一次.

The purpose of this code it to let users use a generated key to download a file once.

推荐答案

这是在最新版 aws-sdk 上使用流式处理的完整代码

This is the entire code using streaming on the latest version of aws-sdk

var express = require('express');
var app = express();
var fs = require('fs');

app.get('/', function(req, res, next){
    res.send('You did not say the magic word');
});


app.get('/s3Proxy', function(req, res, next){
    // download the file via aws s3 here
    var fileKey = req.query['fileKey'];

    console.log('Trying to download file', fileKey);
    var AWS = require('aws-sdk');
    AWS.config.update(
      {
        accessKeyId: "....",
        secretAccessKey: "...",
        region: 'ap-southeast-1'
      }
    );
    var s3 = new AWS.S3();
    var options = {
        Bucket    : '/bucket-url',
        Key    : fileKey,
    };

    res.attachment(fileKey);
    var fileStream = s3.getObject(options).createReadStream();
    fileStream.pipe(res);
});

var server = app.listen(3000, function () {
    var host = server.address().address;
    var port = server.address().port;
    console.log('S3 Proxy app listening at http://%s:%s', host, port);
});

这篇关于NodeJS 如何从 aws s3 存储桶将文件下载到磁盘?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！