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<?php |
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/** |
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* WebHemi. |
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* |
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* PHP version 7.1 |
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* |
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* @copyright 2012 - 2018 Gixx-web (http://www.gixx-web.com) |
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* @license https://opensource.org/licenses/MIT The MIT License (MIT) |
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* |
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* @link http://www.gixx-web.com |
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*/ |
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declare(strict_types = 1); |
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namespace WebHemi\CSRF\ServiceAdapter\Base; |
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use WebHemi\CSRF\ServiceInterface; |
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use WebHemi\Session\ServiceInterface as SessionInterface; |
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/** |
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* Class ServiceAdapter. |
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*/ |
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class ServiceAdapter implements ServiceInterface |
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{ |
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protected $sessionManager; |
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/** |
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* ServiceInterface constructor. |
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* |
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* @param SessionInterface $sessionManager |
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*/ |
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public function __construct(SessionInterface $sessionManager) |
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{ |
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$this->sessionManager = $sessionManager; |
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} |
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/** |
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* Generate a CSRF token. |
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* |
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* @param string $key |
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* @return string |
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*/ |
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public function generate(string $key) : string |
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{ |
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$key = preg_replace('/[^a-zA-Z0-9]/', '', $key); |
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$extra = $this->getClientHash(); |
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try { |
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$randomString = bin2hex(random_bytes(16)); |
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$randomString = str_pad(substr($randomString, 0, 32), 32, 'a', STR_PAD_LEFT); |
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} catch (\Throwable $error) { |
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$randomString = $this->getRandomString(32); |
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} |
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$token = base64_encode(time() . $extra . $randomString); |
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$this->sessionManager->set(self::SESSION_PREFIX.'_'.$key, $token); |
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return $token; |
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} |
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/** |
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* Check the CSRF token is valid. |
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* |
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* @param string $key |
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* @param string $token |
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* @param null|int $ttl |
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* @param bool $multiple |
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* @return bool |
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*/ |
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public function verify(string $key, string $token, ? int $ttl = null, bool $multiple = false) : bool |
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{ |
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$key = preg_replace('/[^a-zA-Z0-9]/', '', $key); |
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$sessionToken = $this->sessionManager->get(self::SESSION_PREFIX.'_'.$key) ?? ''; |
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if (!$multiple) { |
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$this->sessionManager->delete(self::SESSION_PREFIX.'_'.$key); |
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} |
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$sessionToken = $this->decodeToken($sessionToken); |
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$token = $this->decodeToken($token); |
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return !((!empty($ttl) && $sessionToken['time'] + $ttl > time()) |
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|| ($token['extra'] != $this->getClientHash()) |
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|| ($sessionToken['randomString'] != $token['randomString']) |
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); |
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} |
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/** |
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* Decodes the given token. |
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* |
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* @param string $token |
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* @return array |
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*/ |
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protected function decodeToken(string $token) : array |
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{ |
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$token = base64_decode($token) ?: str_repeat('0', 82); |
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return [ |
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'time' => substr($token, 0, 10), |
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'extra' => substr($token, 10, 40), |
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'randomString' => substr($token, 50), |
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]; |
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} |
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/** |
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* @return string |
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*/ |
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protected function getClientHash() : string |
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{ |
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return sha1($_SERVER['REMOTE_ADDR'] . $_SERVER['HTTP_USER_AGENT']); |
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} |
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/** |
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* Generate a random string |
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* |
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* @param int $length |
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* @return string |
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*/ |
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protected function getRandomString(int $length) : string |
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{ |
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$seed = 'abcdef0123456789'; |
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$max = strlen($seed) - 1; |
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$string = ''; |
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for ($i = 0; $i < $length; ++$i) { |
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$string .= $seed[intval(mt_rand(0.0, $max))]; |
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} |
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return $string; |
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} |
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} |
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Gixx /
WebHemi
