ModulesController.php

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

class ModulesController extends \TYPO3\CMS\Extbase\Mvc\Controller\ActionController {

    public function indexAction() {
        $warnings = array();
        // Hook for additional warnings
        if (is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_befunc.php']['displayWarningMessages'])) {
            foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_befunc.php']['displayWarningMessages'] as $classRef) {
                $hookObj = \TYPO3\CMS\Core\Utility\GeneralUtility::getUserObj($classRef);
                if (method_exists($hookObj, 'displayWarningMessages_postProcess')) {
                    $hookObj->displayWarningMessages_postProcess($warnings);
                }
            }
        }
        if (count($warnings)) {
            if (count($warnings) > 1) {
                $securityWarnings = '<ul><li>' . implode('</li><li>', $warnings) . '</li></ul>';
            } else {
                $securityWarnings = '<p>' . implode('', $warnings) . '</p>';
            }
            $securityMessage = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
                'TYPO3\\CMS\\Core\\Messaging\\FlashMessage',
                $securityWarnings,
                $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_core.xlf:warning.header'),
                \TYPO3\CMS\Core\Messaging\FlashMessage::ERROR
            );
            $contentWarnings = '<div style="margin: 20px 0px;">' . $securityMessage->render() . '</div>';
            unset($warnings);
        }

        $this->view->assignMultiple(
            array(
                'TYPO3Version' => TYPO3_version,
                'copyRightNotice' => \TYPO3\CMS\Backend\Utility\BackendUtility::TYPO3_copyRightNotice(),
                'warningMessages' => $contentWarnings,
                'modules' => $this->getModulesData()
            )
        );
    }

    protected function getModulesData() {
        $loadedModules = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Backend\\Module\\ModuleLoader');
        $loadedModules->observeWorkspaces = TRUE;
        $loadedModules->load($GLOBALS['TBE_MODULES']);
        $mainModulesData = array();
        foreach ($loadedModules->modules as $moduleName => $moduleInfo) {
            $mainModuleData = array();
            $moduleKey = $moduleName . '_tab';
            $mainModuleData['name'] = $moduleName;
            $mainModuleData['label'] = $GLOBALS['LANG']->moduleLabels['tabs'][$moduleKey];
            if (is_array($moduleInfo['sub']) && count($moduleInfo['sub']) > 0) {
                $mainModuleData['subModules'] = $this->getSubModuleData($moduleName, $moduleInfo['sub']);
            }
            $mainModulesData[] = $mainModuleData;
        }
        return $mainModulesData;
    }

    protected function getSubModuleData($moduleName, array $subModulesInfo = array()) {
        $subModulesData = array();
        foreach ($subModulesInfo as $subModuleName => $subModuleInfo) {
            $subModuleKey = $moduleName . '_' . $subModuleName . '_tab';
            $subModuleData = array();
            $subModuleData['name'] = $subModuleName;
            $subModuleData['icon'] = \TYPO3\CMS\Core\Utility\PathUtility::stripPathSitePrefix($GLOBALS['LANG']->moduleLabels['tabs_images'][$subModuleKey]);
            $subModuleData['label'] = $GLOBALS['LANG']->moduleLabels['tabs'][$subModuleKey];
            $subModuleData['shortDescription'] = $GLOBALS['LANG']->moduleLabels['labels'][$subModuleKey . 'label'];
            $subModuleData['longDescription'] = $GLOBALS['LANG']->moduleLabels['labels'][$subModuleKey . 'descr'];
            $subModulesData[] = $subModuleData;
        }
        return $subModulesData;
    }

}