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JavaScript

Client.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);
};