73 lines
1.8 KiB
PHP
73 lines
1.8 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\HttpKernel;
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/**
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* UriSigner.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class UriSigner
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{
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private $secret;
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/**
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* Constructor.
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*
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* @param string $secret A secret
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*/
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public function __construct($secret)
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{
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$this->secret = $secret;
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}
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/**
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* Signs a URI.
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*
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* The given URI is signed by adding a _hash query string parameter
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* which value depends on the URI and the secret.
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*
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* @param string $uri A URI to sign
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*
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* @return string The signed URI
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*/
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public function sign($uri)
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{
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return $uri.(false === (strpos($uri, '?')) ? '?' : '&').'_hash='.$this->computeHash($uri);
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}
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/**
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* Checks that a URI contains the correct hash.
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*
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* @param string $uri A signed URI
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*
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* @return Boolean True if the URI is signed correctly, false otherwise
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*/
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public function check($uri)
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{
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if (!preg_match('/(\?|&)_hash=(.+?)(&|$)/', $uri, $matches, PREG_OFFSET_CAPTURE)) {
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return false;
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}
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// the naked URI is the URI without the _hash parameter (we need to keep the ? if there is some other parameters after)
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$offset = ('?' == $matches[1][0] && '&' != $matches[3][0]) ? 0 : 1;
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$nakedUri = substr($uri, 0, $matches[0][1] + $offset).substr($uri, $matches[0][1] + strlen($matches[0][0]));
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return $this->computeHash($nakedUri) === $matches[2][0];
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}
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private function computeHash($uri)
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{
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return urlencode(base64_encode(hash_hmac('sha1', $uri, $this->secret, true)));
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}
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}
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