FormController.php

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<?php
namespace TYPO3\CMS\Form\Controller;

class FormController {

    protected $typoscript = array();

    protected $typoscriptFactory;

    protected $localizationHandler;

    protected $requestHandler;

    protected $layoutHandler;

    protected $validate;

    public function initialize(array $typoscript) {
        $this->typoscriptFactory = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Form\\Domain\\Factory\\TypoScriptFactory');
        $this->localizationHandler = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Form\\Localization');
        $this->layoutHandler = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Form\\Layout');
        $this->requestHandler = $this->typoscriptFactory->setRequestHandler($typoscript);
        $this->validate = $this->typoscriptFactory->setRules($typoscript);
        $this->typoscript = $typoscript;
    }

    public function cObjGetSingleExt($typoScriptObjectName, array $typoScript, $typoScriptKey, \TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer $contentObject) {
        $content = '';
        if ($typoScriptObjectName === 'FORM' && !empty($typoScript['useDefaultContentObject'])) {
            $content = $contentObject->getContentObject($typoScriptObjectName)->render($typoScript);
        } elseif ($typoScriptObjectName === 'FORM') {
            if ($contentObject->data['CType'] === 'mailform') {
                $bodytext = $contentObject->data['bodytext'];
                $typoScriptParser = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\TypoScript\\Parser\\TypoScriptParser');
                $typoScriptParser->parse($bodytext);
                $mergedTypoScript = (array)$typoScriptParser->setup;
                \TYPO3\CMS\Core\Utility\ArrayUtility::mergeRecursiveWithOverrule($mergedTypoScript, (array)$typoScript);
                // Disables content elements since TypoScript is handled that could contain insecure settings:
                $mergedTypoScript[\TYPO3\CMS\Form\Domain\Factory\TypoScriptFactory::PROPERTY_DisableContentElement] = TRUE;
            }
            $newTypoScript = array(
                '10' => 'FORM_INT',
                '10.' => is_array($mergedTypoScript) ? $mergedTypoScript : $typoScript,
            );
            $content = $contentObject->COBJ_ARRAY($newTypoScript, 'INT');
            // Only apply stdWrap to TypoScript that was NOT created by the wizard:
            if (isset($typoScript['stdWrap.'])) {
                $content = $contentObject->stdWrap($content, $typoScript['stdWrap.']);
            }
        } elseif ($typoScriptObjectName === 'FORM_INT') {
            $this->initialize($typoScript);
            $content = $this->execute();
        }
        return $content;
    }

    public function execute() {
        // Form
        if ($this->showForm()) {
            $content = $this->renderForm();
        } elseif ($this->showConfirmation()) {
            $content = $this->renderConfirmation();
        } else {
            $content = $this->doPostProcessing();
        }
        return $content;
    }

    protected function showForm() {
        $show = FALSE;
        $submittedByPrefix = $this->requestHandler->getByMethod();
        if (
            $submittedByPrefix === NULL ||
            !empty($submittedByPrefix) && !$this->validate->isValid() ||
            !empty($submittedByPrefix) && $this->validate->isValid() &&
            $this->requestHandler->getPost('confirmation-false', NULL) !== NULL
        ) {
            $show = TRUE;
        }
        return $show;
    }

    protected function renderForm() {
        $layout = $this->typoscriptFactory->getLayoutFromTypoScript($this->typoscript['form.']);
        $this->layoutHandler->setLayout($layout);
        $this->requestHandler->destroySession();

        $form = $this->typoscriptFactory->buildModelFromTyposcript($this->typoscript);
        $view = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Form\\View\\Form\\FormView', $form);
        return $view->get();
    }

    protected function showConfirmation() {
        $show = FALSE;
        if (isset($this->typoscript['confirmation']) && $this->typoscript['confirmation'] == 1 && $this->requestHandler->getPost('confirmation-true', NULL) === NULL) {
            $show = TRUE;
        }
        return $show;
    }

    protected function renderConfirmation() {
        $confirmationTyposcript = array();
        if (isset($this->typoscript['confirmation.'])) {
            $confirmationTyposcript = $this->typoscript['confirmation.'];
        }

        $layout = $this->typoscriptFactory->getLayoutFromTypoScript($confirmationTyposcript);
        $form = $this->typoscriptFactory->buildModelFromTyposcript($this->typoscript);

        $this->layoutHandler->setLayout($layout);
        $this->requestHandler->storeSession();
        $view = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Form\\View\\Confirmation\\ConfirmationView', $form, $confirmationTyposcript);
        return $view->get();
    }

    protected function doPostProcessing() {
        $form = $this->typoscriptFactory->buildModelFromTyposcript($this->typoscript);
        $postProcessorTypoScript = array();
        if (isset($this->typoscript['postProcessor.'])) {
            $postProcessorTypoScript = $this->typoscript['postProcessor.'];
        }
        $postProcessor = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Form\\PostProcess\\PostProcessor', $form, $postProcessorTypoScript);
        $content = $postProcessor->process();
        $this->requestHandler->destroySession();
        return $content;
    }

}