FormViewHelper.php

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<?php
 
declare(strict_types=1);
 
/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
 
/*
 * Inspired by and partially taken from the Neos.Form package (www.neos.io)
 */
 
namespace ‪TYPO3\CMS\Form\ViewHelpers;
 
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
use ‪TYPO3\CMS\Fluid\ViewHelpers\FormViewHelper as FluidFormViewHelper;
use ‪TYPO3\CMS\Form\Domain\Runtime\FormRuntime;
use TYPO3Fluid\Fluid\Core\ViewHelper\TagBuilder;
 
class ‪FormViewHelper extends FluidFormViewHelper
{
 
    protected function ‪renderHiddenReferrerFields()
    {
        $formRuntime = $this->‪getFormRuntime();
        $prefix = $this->‪prefixFieldName($this->‪getFormObjectName());
 
        $markup = $this->‪createHiddenInputElement(
            $prefix . '[__state]',
            $this->hashService->appendHmac(
                base64_encode(serialize($formRuntime->getFormState()))
            )
        );
 
        // ONLY assign `__session` if form is performing (uncached)
        if ($formRuntime->canProcessFormSubmission() && $formRuntime->getFormSession() !== null) {
            $markup .= $this->‪createHiddenInputElement(
                $prefix . '[__session]',
                $formRuntime->getFormSession()->getAuthenticatedIdentifier()
            );
        }
        return $markup;
    }
 
    protected function ‪createHiddenInputElement(string $name, string $value): string
    {
        $tagBuilder = GeneralUtility::makeInstance(TagBuilder::class, 'input');
        $tagBuilder->addAttribute('type', 'hidden');
        $tagBuilder->addAttribute('name', $name);
        $tagBuilder->addAttribute('value', $value);
        return $tagBuilder->render();
    }
 
    protected function ‪getFormObjectName()
    {
        return $this->‪getFormRuntime()->getFormDefinition()->getIdentifier();
    }
 
    protected function ‪getFormRuntime(): ‪FormRuntime
    {
        return $this->arguments['object'];
    }
}