Node.js ファイルのダウンロード

gistfile1.js

var fs = require('fs');
var path = require('path');
var http = require('http');

// リンク先は .mp3 ファイル
var options = {
    method : 'GET',
    host   : 'm.friendfeed-media.com',
    port   : '80',
    path   : '/0c5e82d9e6a0d5e60a1a85609adbe0e7f02976a6'
};


var req = http.request(options);
req.end();

req.on('response', function (res) {
    onResponseCallback(res, options);
});
req.on('error', showError);


function onResponseCallback (res, opts) {
    var ext    = (res.headers['content-type'].split(/\//))[1];
    var target = [ (opts['path'].split(/\?/))[0].replace(/^\//,''), ext ].join('.');
    var writeStream = fs.createWriteStream(target);
    writeStream.on('error', function (exception) {
        throw exception;
    });
    writeStream.on('close', function () {
        console.log('! Called "close" on writeStream');
    });

    //res.setEncoding('utf-8'); バイナリを扱うので指定しないと、 Buffer に
    res.on('data', function (chunk) {
        writeStream.write(chunk); 
    });
    res.on('close', showError);
    res.on('end', function () {
        writeStream.end();
        console.log(target);
    });
}


function showError (e) {
    console.log([ e.name, e.messsage ].join(': '));
    return undefined;
}

1;