TypoScriptFrontendControllerHook.php

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<?php
namespace TYPO3\CMS\Workspaces\Hook;

class TypoScriptFrontendControllerHook {

    public function hook_eofe($params, $pObj) {
        // 2 means preview of a non-live workspace
        if ($pObj->fePreview !== 2) {
            return;
        }

        $backendDomain = $this->getBackendUserAuthentication()->getSessionData('workspaces.backend_domain');
        if (empty($backendDomain)) {
            $backendDomain = \TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('TYPO3_HOST_ONLY');
        }

        $previewParts = $this->getTypoScriptFrontendController()->cObj->cObjGetSingle('FLUIDTEMPLATE', array(
            'file' => 'EXT:workspaces/Resources/Private/Templates/Preview/Preview.html',
            'variables.' => array(
                'backendDomain' => 'TEXT',
                'backendDomain.' => array('value' => $backendDomain)
            )
        ));
        $this->getTypoScriptFrontendController()->content = str_ireplace('</body>', $previewParts . '</body>', $this->getTypoScriptFrontendController()->content);
    }

    protected function getTypoScriptFrontendController() {
        return $GLOBALS['TSFE'];
    }

    protected function getBackendUserAuthentication() {
        return $GLOBALS['BE_USER'];
    }

}