Snippet para listar e enviar arquivos para AS3

aws.js

var AWS = require('aws-sdk');
AWS.config.loadFromPath('./aws.json');
console.log('KEY: '+ process.env.AWS_SECRET_ACCESS_KEY);
console.log('ACCESS: '+ process.env.AWS_ACCESS_KEY_ID);

var s3 = new AWS.S3();
s3.listBuckets(function(err, data) {
  for (var index in data.Buckets) {
    var bucket = data.Buckets[index];
    console.log("Bucket: ", bucket.Name, ' : ', bucket.CreationDate);
  }
});

var nameFile = '/Users/vinioliveira/Desktop/filme.png';
var file = require('fs').readFileSync(nameFile);
var metaData = getContentTypeByFile(nameFile);
var key = 'new_upload.png';

var params = {Bucket: 'dennuci', Key: key};

s3.putObject({
  ACL         : 'public-read',
  Bucket      : 'dennuci' ,
  Key         : key,
  Body        : file,
  ContentType : metaData
  }, function(error, resp) {
    console.log(arguments);
    console.log(resp);
  });

s3.getSignedUrl('getObject', params , function (err, url) {
  console.log("The URL is", url);
});

function getContentTypeByFile(fileName) {
  var rc = 'application/octet-stream';
  var fn = fileName.toLowerCase();

  if (fn.indexOf('.html') >= 0) rc = 'text/html';
  else if (fn.indexOf('.css') >= 0) rc = 'text/css';
  else if (fn.indexOf('.json') >= 0) rc = 'application/json';
  else if (fn.indexOf('.js') >= 0) rc = 'application/x-javascript';
  else if (fn.indexOf('.png') >= 0) rc = 'image/png';
  else if (fn.indexOf('.jpg') >= 0) rc = 'image/jpg';

  return rc;
}