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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;
private $parameter;
/**
* @param string $secret A secret
* @param string $parameter Query string parameter to use
*/
public function __construct(string $secret, string $parameter = '_hash')
{
$this->secret = $secret;
$this->parameter = $parameter;
}
/**
* Signs a URI.
*
* The given URI is signed by adding the 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)
{
$url = parse_url($uri);
if (isset($url['query'])) {
parse_str($url['query'], $params);
} else {
$params = array();
}
$uri = $this->buildUrl($url, $params);
return $uri.(false === strpos($uri, '?') ? '?' : '&').$this->parameter.'='.$this->computeHash($uri);
}
/**
* Checks that a URI contains the correct hash.
*
* @param string $uri A signed URI
*
* @return bool True if the URI is signed correctly, false otherwise
*/
public function check($uri)
{
$url = parse_url($uri);
if (isset($url['query'])) {
parse_str($url['query'], $params);
} else {
$params = array();
}
if (empty($params[$this->parameter])) {
return false;
}
$hash = urlencode($params[$this->parameter]);
unset($params[$this->parameter]);
return $this->computeHash($this->buildUrl($url, $params)) === $hash;
}
private function computeHash($uri)
{
return urlencode(base64_encode(hash_hmac('sha256', $uri, $this->secret, true)));
}
private function buildUrl(array $url, array $params = array())
{
ksort($params, SORT_STRING);
$url['query'] = http_build_query($params, '', '&');
$scheme = isset($url['scheme']) ? $url['scheme'].'://' : '';
$host = isset($url['host']) ? $url['host'] : '';
$port = isset($url['port']) ? ':'.$url['port'] : '';
$user = isset($url['user']) ? $url['user'] : '';
$pass = isset($url['pass']) ? ':'.$url['pass'] : '';
$pass = ($user || $pass) ? "$pass@" : '';
$path = isset($url['path']) ? $url['path'] : '';
$query = isset($url['query']) && $url['query'] ? '?'.$url['query'] : '';
$fragment = isset($url['fragment']) ? '#'.$url['fragment'] : '';
return $scheme.$user.$pass.$host.$port.$path.$query.$fragment;
}
}