UpdateExtensionGrid.php

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<?php
namespace Magento\Setup\Controller;

use Zend\Mvc\Controller\AbstractActionController;
use Zend\View\Model\JsonModel;
use Zend\View\Model\ViewModel;
use Magento\Setup\Model\Grid;

class UpdateExtensionGrid extends AbstractActionController
{
    private $gridExtension;

    public function __construct(Grid\Extension $gridExtension)
    {
        $this->gridExtension = $gridExtension;
    }

    public function indexAction()
    {
        $view = new ViewModel();
        $view->setTerminal(true);
        return $view;
    }

    public function extensionsAction()
    {
        $extensions = $this->gridExtension->getListForUpdate();

        return new JsonModel(
            [
                'success' => true,
                'extensions' => array_values($extensions),
                'total' => count($extensions)
            ]
        );
    }
}