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<?php
namespace Bitrix\Main\Engine\ActionFilter;
use Bitrix\Main\Context;
use Bitrix\Main\Engine\Controller;
use Bitrix\Main\Error;
use Bitrix\Main\Event;
use Bitrix\Main\EventResult;
final class Csrf extends Base
{
public const HEADER_WITH_NEW_CSRF = 'X-Bitrix-New-Csrf';
public const ERROR_INVALID_CSRF = 'invalid_csrf';
/**
* @var bool
*/
private $enabled;
/**
* @var string
*/
private $tokenName;
/**
* @var bool
*/
private $returnNew;
/**
* Csrf constructor.
*
* @param bool $enabled
* @param string $tokenName
* @param bool $returnNew
*/
public function __construct(bool $enabled = true, string $tokenName = 'sessid', bool $returnNew = true)
{
$this->enabled = $enabled;
$this->tokenName = $tokenName;
$this->returnNew = $returnNew;
parent::__construct();
}
/**
* List allowed values of scopes where the filter should work.
* @return array
*/
public function listAllowedScopes()
{
return [
Controller::SCOPE_AJAX,
];
}
public function onBeforeAction(Event $event)
{
if (!$this->enabled)
{
return null;
}
if (!check_bitrix_sessid($this->tokenName))
{
$errorCustomData = [];
if ($this->returnNew)
{
$errorCustomData['csrf'] = bitrix_sessid();
Context::getCurrent()->getResponse()->addHeader(
self::HEADER_WITH_NEW_CSRF, $errorCustomData['csrf']
);
}
$this->addError(new Error(
'Invalid csrf token',
self::ERROR_INVALID_CSRF, $errorCustomData
));
return new EventResult(EventResult::ERROR, null, null, $this);
}
return null;
}
}