114 lines
3.1 KiB
PHP
114 lines
3.1 KiB
PHP
|
<?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;
|
||
|
|
|
||
|
|
use Symfony\Component\HttpFoundation\Request;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
public function sign(string $uri)
|
||
|
|
{
|
||
|
|
$url = parse_url($uri);
|
||
|
|
if (isset($url['query'])) {
|
||
|
|
parse_str($url['query'], $params);
|
||
|
|
} else {
|
||
|
|
$params = [];
|
||
|
|
}
|
||
|
|
|
||
|
|
$uri = $this->buildUrl($url, $params);
|
||
|
|
$params[$this->parameter] = $this->computeHash($uri);
|
||
|
|
|
||
|
|
return $this->buildUrl($url, $params);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks that a URI contains the correct hash.
|
||
|
|
*
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
public function check(string $uri)
|
||
|
|
{
|
||
|
|
$url = parse_url($uri);
|
||
|
|
if (isset($url['query'])) {
|
||
|
|
parse_str($url['query'], $params);
|
||
|
|
} else {
|
||
|
|
$params = [];
|
||
|
|
}
|
||
|
|
|
||
|
|
if (empty($params[$this->parameter])) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
$hash = $params[$this->parameter];
|
||
|
|
unset($params[$this->parameter]);
|
||
|
|
|
||
|
|
return hash_equals($this->computeHash($this->buildUrl($url, $params)), $hash);
|
||
|
|
}
|
||
|
|
|
||
|
|
public function checkRequest(Request $request): bool
|
||
|
|
{
|
||
|
|
$qs = ($qs = $request->server->get('QUERY_STRING')) ? '?'.$qs : '';
|
||
|
|
|
||
|
|
// we cannot use $request->getUri() here as we want to work with the original URI (no query string reordering)
|
||
|
|
return $this->check($request->getSchemeAndHttpHost().$request->getBaseUrl().$request->getPathInfo().$qs);
|
||
|
|
}
|
||
|
|
|
||
|
|
private function computeHash(string $uri): string
|
||
|
|
{
|
||
|
|
return base64_encode(hash_hmac('sha256', $uri, $this->secret, true));
|
||
|
|
}
|
||
|
|
|
||
|
|
private function buildUrl(array $url, array $params = []): string
|
||
|
|
{
|
||
|
|
ksort($params, \SORT_STRING);
|
||
|
|
$url['query'] = http_build_query($params, '', '&');
|
||
|
|
|
||
|
|
$scheme = isset($url['scheme']) ? $url['scheme'].'://' : '';
|
||
|
|
$host = $url['host'] ?? '';
|
||
|
|
$port = isset($url['port']) ? ':'.$url['port'] : '';
|
||
|
|
$user = $url['user'] ?? '';
|
||
|
|
$pass = isset($url['pass']) ? ':'.$url['pass'] : '';
|
||
|
|
$pass = ($user || $pass) ? "$pass@" : '';
|
||
|
|
$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;
|
||
|
|
}
|
||
|
|
}
|