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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\Form\Extension\Csrf\CsrfProvider;
/**
* Default implementation of CsrfProviderInterface.
*
* This provider uses the session ID returned by session_id() as well as a
* user-defined secret value to secure the CSRF token.
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class DefaultCsrfProvider implements CsrfProviderInterface
{
/**
* A secret value used for generating the CSRF token
* @var string
*/
protected $secret;
/**
* Initializes the provider with a secret value
*
* A recommended value for the secret is a generated value with at least
* 32 characters and mixed letters, digits and special characters.
*
* @param string $secret A secret value included in the CSRF token
*/
public function __construct($secret)
{
$this->secret = $secret;
}
/**
* {@inheritDoc}
*/
public function generateCsrfToken($intention)
{
return sha1($this->secret.$intention.$this->getSessionId());
}
/**
* {@inheritDoc}
*/
public function isCsrfTokenValid($intention, $token)
{
return $token === $this->generateCsrfToken($intention);
}
/**
* Returns the ID of the user session.
*
* Automatically starts the session if necessary.
*
* @return string The session ID
*/
protected function getSessionId()
{
if (version_compare(PHP_VERSION, '5.4', '>=')) {
if (PHP_SESSION_NONE === session_status()) {
session_start();
}
} elseif (!session_id()) {
session_start();
}
return session_id();
}
}
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