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Edit File: CsrfMiddleware.php

<?php
/**
 * @package   SureCartCore
 * @author    SureCart <support@surecart.com>
 * @copyright 2017-2019 SureCart
 * @license   https://www.gnu.org/licenses/gpl-2.0.html GPL-2.0
 * @link      https://surecart.com/
 */

namespace SureCartCore\Csrf;

use Closure;
use SureCartVendors\Psr\Http\Message\ResponseInterface;
use SureCartCore\Requests\RequestInterface;

/**
 * Store current request data and clear old request data
 */
class CsrfMiddleware {
	/**
	 * CSRF service.
	 *
	 * @var Csrf
	 */
	protected $csrf = null;

/**
	 * Constructor.
	 *
	 * @param Csrf $csrf
	 */
	public function __construct( $csrf ) {
		$this->csrf = $csrf;
	}

/**
	 * Reject requests that fail nonce validation.
	 *
	 * @param  RequestInterface $request
	 * @param  Closure          $next
	 * @param  mixed            $action
	 * @return ResponseInterface
	 * @throws InvalidCsrfTokenException
	 */
	public function handle( RequestInterface $request, Closure $next, $action = -1 ) {
		if ( ! $request->isReadVerb() ) {
			$token = $this->csrf->getTokenFromRequest( $request );
			if ( ! $this->csrf->isValidToken( $token, $action ) ) {
				throw new InvalidCsrfTokenException();
			}
		}

$this->csrf->generateToken( $action );

return $next( $request );
	}
}

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