NodeJS如何从aws s3存储桶中将文件下载到磁盘?

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:

我当前正在使用awssum-amazon-s3创建下载流.但是，我只设法将文件保存到服务器或将其流式传输到命令行...如您从我的代码中看到的那样，我的最后一次尝试是尝试手动设置失败的内容处置头.我无法使用res.download()，因为已经设置了标头?

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?

我如何实现我的目标?

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!');
        });
    };

此代码的目的是让用户使用生成的密钥一次下载文件.

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

推荐答案

这是在最新版本的aws-sdk上使用流传输的全部代码

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);
});

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