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

maybe one too many newlines?

var stringToSign ='GET\n\n\n' + date + '\n\n' + resource;

If its any help here is a rubbish PHP implementation which definitely works:

class myS3Helper{
public function getSignedImageLink($timeout = 1800)
    {

        $now = new Zend_Date(); //Gives us a time object that is set to NOW
        $now->setTimezone('UTC'); //Set to UTC a-la AWS requirements
        $now->addSecond($timeout);
        $expirationTime = $now->getTimestamp(); //returns unix timestamp representation of the time.

        $signature = urlencode(
                base64_encode(
                        hash_hmac(
                                'sha1', $this->_generateStringToSign($expirationTime),
                                $my_aws_secretkey, 
                                true
                                )
                        )
                );

        //FIXME make this less ugly when I know it works
        $url = 'https://';
        $url .= Zend_Service_Amazon_S3::S3_ENDPOINT; //e.g s3.amazonaws.com
        $url .= $this->_getImagePath(); //e.g /mybucket/myFirstCar.jpg
        $url .='?AWSAccessKeyId=' . $my_aws_key;
        $url .='&Signature=' . $signature; //signature as returned by below function
        $url .='&Expires=' . $expirationTime;

        return $url;


    }

    protected function _generateStringToSign($expires)
    {   

        $string = "GET\n"; //Methods
        $string .= "\n";
        $string .= "\n";
        $string .= "$expires\n"; //Expires
        $string .= $this->_getImagePath();

        return $string;
    }

}

EDIT--

Have a look at this node.js s3 upload code, (it's not mine but found it lying around on my mac - so if anyone can attribute it to someone let me know and i'll do the props). Hopefully this might help (3rd time lucky)

https://gist.github.com/1370593