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- Veröffentlicht
- 28.08.2024
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UriSigner.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpKernel;
013
014 /**
015 * Signs URIs.
016 *
017 * @author Fabien Potencier <fabien@symfony.com>
018 */
019 class UriSigner
020 {
021 private $secret;
022 private $parameter;
023
024 /**
025 * @param string $secret A secret
026 * @param string $parameter Query string parameter to use
027 */
028 public function __construct($secret, $parameter = '_hash')
029 {
030 $this->secret = $secret;
031 $this->parameter = $parameter;
032 }
033
034 /**
035 * Signs a URI.
036 *
037 * The given URI is signed by adding the query string parameter
038 * which value depends on the URI and the secret.
039 *
040 * @param string $uri A URI to sign
041 *
042 * @return string The signed URI
043 */
044 public function sign($uri)
045 {
046 $url = parse_url($uri);
047 if (isset($url['query'])) {
048 parse_str($url['query'], $params);
049 } else {
050 $params = [];
051 }
052
053 $uri = $this->buildUrl($url, $params);
054 $params[$this->parameter] = $this->computeHash($uri);
055
056 return $this->buildUrl($url, $params);
057 }
058
059 /**
060 * Checks that a URI contains the correct hash.
061 *
062 * @param string $uri A signed URI
063 *
064 * @return bool True if the URI is signed correctly, false otherwise
065 */
066 public function check($uri)
067 {
068 $url = parse_url($uri);
069 if (isset($url['query'])) {
070 parse_str($url['query'], $params);
071 } else {
072 $params = [];
073 }
074
075 if (empty($params[$this->parameter])) {
076 return false;
077 }
078
079 $hash = $params[$this->parameter];
080 unset($params[$this->parameter]);
081
082 return hash_equals($this->computeHash($this->buildUrl($url, $params)), $hash);
083 }
084
085 private function computeHash($uri)
086 {
087 return base64_encode(hash_hmac('sha256', $uri, $this->secret, true));
088 }
089
090 private function buildUrl(array $url, array $params = [])
091 {
092 ksort($params, \SORT_STRING);
093 $url['query'] = http_build_query($params, '', '&');
094
095 $scheme = isset($url['scheme']) ? $url['scheme'].'://' : '';
096 $host = isset($url['host']) ? $url['host'] : '';
097 $port = isset($url['port']) ? ':'.$url['port'] : '';
098 $user = isset($url['user']) ? $url['user'] : '';
099 $pass = isset($url['pass']) ? ':'.$url['pass'] : '';
100 $pass = ($user || $pass) ? "$pass@" : '';
101 $path = isset($url['path']) ? $url['path'] : '';
102 $query = isset($url['query']) && $url['query'] ? '?'.$url['query'] : '';
103 $fragment = isset($url['fragment']) ? '#'.$url['fragment'] : '';
104
105 return $scheme.$user.$pass.$host.$port.$path.$query.$fragment;
106 }
107 }
108