abhi1693/yii2-app-advanced-startup-kit

<?php
    namespace backend\controllers;

    use abhimanyu\installer\helpers\enums\Configuration as Enum;
    use Yii;
    use yii\filters\AccessControl;
    use yii\web\Controller;
    use yii\web\ErrorAction;

    /**
     * Site controller
     */
    class SiteController extends Controller
    {
        public function behaviors()
        {
            return [
                'access' => [
                    'class' => AccessControl::className(),
                    'rules' => [
                        [
                            'actions' => ['index', 'error'],
                            'allow'   => TRUE,
                            'roles'   => ['@'],
                        ],
                    ],
                ],
            ];
        }

        /**
         * @inheritdoc
         */
        public function actions()
        {
            return [
                'error' => [
                    'class' => ErrorAction::className(),
                ],
            ];
        }

        public function beforeAction($action)
        {
            // Verifies application is installed properly
            if (!Yii::$app->params[Enum::APP_INSTALLED]) {
                return $this->redirect(Yii::$app->urlManager->createUrl('//installer/install/index'));
            }

            return parent::beforeAction($action);
        }

        /**
         * @return string|\yii\web\Response
         */
        public function actionIndex()
        {
            return $this->render('index');
        }
    }