Node.js File upload to Amazon S3

gistfile1.js

fs.readFile(file.path, function(err, buff){
	completed++;
	if(err){ return; }
	var headers = {
		'Content-Length': buff.length,
		'Content-Type': 'text/plain'
  	};
	var push = client.put(file.name, headers);

	push.on('response', function(res){
		if(res.statusCode === 200){
			console.log('saved', Object.keys(push));
			
			uploaded.push(push.url);
			if(completed === files.length){
				callback(null, uploaded);
			}
		}
	});
	push.end(buff);
})