Revision: 38815
Updated Code
at January 8, 2011 04:18 by esundahl
Updated Code
<?php
// ----------------------------------------------------------------------- //
if(!function_exists('el_crypto_hmacSHA1')){
/**
* Calculate the HMAC SHA1 hash of a string.
*
* @param string $key The key to hash against
* @param string $data The data to hash
* @param int $blocksize Optional blocksize
* @return string HMAC SHA1
*/
function el_crypto_hmacSHA1($key, $data, $blocksize = 64) {
if (strlen($key) > $blocksize) $key = pack('H*', sha1($key));
$key = str_pad($key, $blocksize, chr(0x00));
$ipad = str_repeat(chr(0x36), $blocksize);
$opad = str_repeat(chr(0x5c), $blocksize);
$hmac = pack( 'H*', sha1(
($key ^ $opad) . pack( 'H*', sha1(
($key ^ $ipad) . $data
))
));
return base64_encode($hmac);
}
}
// ----------------------------------------------------------------------- //
if(!function_exists('el_s3_getTemporaryLink')){
/**
* Create temporary URLs to your protected Amazon S3 files.
*
* @param string $accessKey Your Amazon S3 access key
* @param string $secretKey Your Amazon S3 secret key
* @param string $bucket The bucket (bucket.s3.amazonaws.com)
* @param string $path The target file path
* @param int $expires In minutes
* @return string Temporary Amazon S3 URL
* @see http://awsdocs.s3.amazonaws.com/S3/20060301/s3-dg-20060301.pdf
*/
function el_s3_getTemporaryLink($accessKey, $secretKey, $bucket, $path, $expires = 5) {
// Calculate expiry time
$expires = time() + intval(floatval($expires) * 60);
// Fix the path; encode and sanitize
$path = str_replace('%2F', '/', rawurlencode($path = ltrim($path, '/')));
// Path for signature starts with the bucket
$signpath = '/'. $bucket .'/'. $path;
// S3 friendly string to sign
$signsz = implode("\n", $pieces = array('GET', null, null, $expires, $signpath));
// Calculate the hash
$signature = el_crypto_hmacSHA1($secretKey, $signsz);
// Glue the URL ...
$url = sprintf('http://%s.s3.amazonaws.com/%s', $bucket, $path);
// ... to the query string ...
$qs = http_build_query($pieces = array(
'AWSAccessKeyId' => $accessKey,
'Expires' => $expires,
'Signature' => $signature,
));a
// ... and return the URL!
return $url.'?'.$qs;
}
}
Revision: 38814
Initial Code
Initial URL
Initial Description
Initial Title
Initial Tags
Initial Language
at January 8, 2011 04:10 by esundahl
Initial Code
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>Expire Link</title>
</head>
<body>
<?php
// ----------------------------------------------------------------------- //
if(!function_exists('el_crypto_hmacSHA1')){
/**
* Calculate the HMAC SHA1 hash of a string.
*
* @param string $key The key to hash against
* @param string $data The data to hash
* @param int $blocksize Optional blocksize
* @return string HMAC SHA1
*/
function el_crypto_hmacSHA1($key, $data, $blocksize = 64) {
if (strlen($key) > $blocksize) $key = pack('H*', sha1($key));
$key = str_pad($key, $blocksize, chr(0x00));
$ipad = str_repeat(chr(0x36), $blocksize);
$opad = str_repeat(chr(0x5c), $blocksize);
$hmac = pack( 'H*', sha1(
($key ^ $opad) . pack( 'H*', sha1(
($key ^ $ipad) . $data
))
));
return base64_encode($hmac);
}
}
// ----------------------------------------------------------------------- //
if(!function_exists('el_s3_getTemporaryLink')){
/**
* Create temporary URLs to your protected Amazon S3 files.
*
* @param string $accessKey Your Amazon S3 access key
* @param string $secretKey Your Amazon S3 secret key
* @param string $bucket The bucket (bucket.s3.amazonaws.com)
* @param string $path The target file path
* @param int $expires In minutes
* @return string Temporary Amazon S3 URL
* @see http://awsdocs.s3.amazonaws.com/S3/20060301/s3-dg-20060301.pdf
*/
function el_s3_getTemporaryLink($accessKey, $secretKey, $bucket, $path, $expires = 5) {
// Calculate expiry time
$expires = time() + intval(floatval($expires) * 60);
// Fix the path; encode and sanitize
$path = str_replace('%2F', '/', rawurlencode($path = ltrim($path, '/')));
// Path for signature starts with the bucket
$signpath = '/'. $bucket .'/'. $path;
// S3 friendly string to sign
$signsz = implode("\n", $pieces = array('GET', null, null, $expires, $signpath));
// Calculate the hash
$signature = el_crypto_hmacSHA1($secretKey, $signsz);
// Glue the URL ...
$url = sprintf('http://%s.s3.amazonaws.com/%s', $bucket, $path);
// ... to the query string ...
$qs = http_build_query($pieces = array(
'AWSAccessKeyId' => $accessKey,
'Expires' => $expires,
'Signature' => $signature,
));a
// ... and return the URL!
return $url.'?'.$qs;
}
}
// ----------------------------------------------------------------------- //
?>
<?php $url = el_s3_getTemporaryLink('AKIAJ2GRCAERX6CQ6K7A', 'uNOC62Egc3hgIUmT+hcYf7Sb1ihDW9pC9dyDuiEl', 'com.bradcorporation.facebook', 'unlock/album/01copy.mp3', 1); ?>
<a href="<?php echo $url; ?>">This link will expire in 5 minutes.</a>
</body>
Initial URL
Initial Description
This script generates an expiring link to an Amazon S3 file
Initial Title
Amazon S3 Expiring Link
Initial Tags
link
Initial Language
PHP