Creating a signed S3 URL with Javascript

Question

I am attempting to create a signed S3 URL using Javascript & NodeJS. I have used this specification.

var crypto     = require(\'crypto\'),
    date       =          


        

Answer 1

I would try using Knox along with Node.Js . Its known to be a great combination and also itself utilizes the Node.JS Crypto library which is kind of what you're trying to do - saving you time:)

More info here : https://github.com/LearnBoost/knox

Than, you could just do something like:

var knox = require('knox');
var s3Client = knox.createClient({
    key: 'XXX',
    secret: 'XXX',
    bucket: 'XXX'
});

var expires = new Date();
expires.setMinutes(expires.getMinutes() + 30);
var url =  s3Client.signedUrl(filename, expires);

Edit: You could also look into Knox and just check what the signedUrl function does and implement that yourself.Than you could add to the auth.signQuery call an extra option called amazonHeaders:

Client.prototype.signedUrl = function(filename, expiration){
  var epoch = Math.floor(expiration.getTime()/1000);
  var signature = auth.signQuery({
    amazonHeaders: 'response-content-disposition:attachment',
    secret: this.secret,
    date: epoch,
    resource: '/' + this.bucket + url.parse(filename).pathname
  });

  return this.url(filename) +
    '?Expires=' + epoch +
    '&AWSAccessKeyId=' + this.key +
    '&Signature=' + encodeURIComponent(signature);
};

Shai.