Node.js 使用内容处置作为文件名下载文件 [英] Node.js Download File Using Content Disposition as Filename

问题描述

我正在使用请求模块来下载文件，但是当文件名必须来自内容处理"标头时，我不太确定如何将响应通过管道传输到输出流.所以基本上，我需要读取响应直到找到标头，然后将其余部分通过管道传输到该文件名.

I'm using the Request module to download files, but I'm not quite sure how to pipe the response to an output stream when the filename must come from the 'Content-Disposition' header. So basically, I need to read the response until the header is found, and then pipe the rest to that filename.

示例显示如下:

request('http://google.com/doodle.png').pipe(fs.createWriteStream('doodle.png'));

我想做的地方(伪代码):

Where I want to do (pseudocode):

var req = request('http://example.com/download_latest_version?token=XXX');
var filename = req.response.headers['Content-Disposition'];

req.pipe(fs.createWriteStream(filename));

我可以使用请求回调获取文件名:

I could get the filename using the Request callback:

request(url, function(err, res, body) {
 // get res headers here
});

但这不会否定使用管道而不将下载的文件加载到内存中的好处吗?

But wouldn't that negate the benefits of using pipe and not loading the downloaded file into memory?

推荐答案

我正在从 yahoo 请求图像，但它没有使用 content-disposition 标头，但我正在提取 date 和 content-type 标题来构造文件名.这似乎与你想要做的很接近......

I'm reqesting a image from yahoo and it isn't using the content-disposition header but I am extracting the date and content-type headers to construct a filename. This seems close enough to what you're trying to do...

var request = require('request'),
fs = require('fs');

var url2 = 'http://l4.yimg.com/nn/fp/rsz/112113/images/smush/aaroncarter_635x250_1385060042.jpg';

var r = request(url2);

r.on('response',  function (res) {
  res.pipe(fs.createWriteStream('./' + res.headers.date + '.' + res.headers['content-type'].split('/')[1]));

});

请忽略我的图片选择:)

Ignore my image choice please :)

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