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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpKernel;
/**
* Signs URIs.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class UriSigner
{
private $secret;
/**
* Constructor.
*
* @param string $secret A secret
*/
public function __construct($secret)
{
$this->secret = $secret;
}
/**
* Signs a URI.
*
* The given URI is signed by adding a _hash query string parameter
* which value depends on the URI and the secret.
*
* @param string $uri A URI to sign
*
* @return string The signed URI
*/
public function sign($uri)
{
return $uri.(false === (strpos($uri, '?')) ? '?' : '&').'_hash='.$this->computeHash($uri);
}
/**
* Checks that a URI contains the correct hash.
*
* The _hash query string parameter must be the last one
* (as it is generated that way by the sign() method, it should
* never be a problem).
*
* @param string $uri A signed URI
*
* @return Boolean True if the URI is signed correctly, false otherwise
*/
public function check($uri)
{
if (!preg_match('/^(.*)(?:\?|&)_hash=(.+?)$/', $uri, $matches)) {
return false;
}
return $this->computeHash($matches[1]) === $matches[2];
}
private function computeHash($uri)
{
return urlencode(base64_encode(hash_hmac('sha256', $uri, $this->secret, true)));
}
}