MC-15977: PageBuilder preview

Author: eug123

app/code/Magento/PageBuilder/Controller/ContentType/Preview.php

@@ -10,6 +10,7 @@
 
 use Magento\Framework\Controller\ResultFactory;
 use Magento\Framework\App\Action\HttpPostActionInterface;
+use Magento\Framework\Exception\AuthenticationException;
 
 /**
  * Preview controller to render blocks preview on Stage
@@ -26,28 +27,40 @@ class Preview extends \Magento\Framework\App\Action\Action implements HttpPostAc
      */
     private $rendererPool;
 
+    /**
+     * @var \Magento\Backend\Model\Auth
+     */
+    protected $auth;
+
     /**
      * Constructor
      *
      * @param \Magento\Backend\App\Action\Context $context
      * @param \Magento\PageBuilder\Model\Stage\RendererPool $rendererPool
+     * @param \Magento\Backend\Model\Auth $auth
      */
     public function __construct(
         \Magento\Backend\App\Action\Context $context,
-        \Magento\PageBuilder\Model\Stage\RendererPool $rendererPool
+        \Magento\PageBuilder\Model\Stage\RendererPool $rendererPool,
+        \Magento\Backend\Model\Auth $auth
     ) {
         parent::__construct($context);
 
         $this->rendererPool = $rendererPool;
+        $this->auth = $auth;
     }
 
     /**
      * Generates an HTML preview for the stage
      *
      * @return \Magento\Framework\Controller\ResultInterface
+     * @throws \Magento\Framework\Exception\AuthenticationException
      */
     public function execute()
     {
+        if (!$this->auth->isLoggedIn()) {
+            throw new AuthenticationException(__('An authentication error occurred. Verify and try again.'));
+        }
         $pageResult = $this->resultFactory->create(ResultFactory::TYPE_PAGE);
         // Some template filters and directive processors expect this to be called in order to function.
         $pageResult->initLayout();