StartUpdater.php

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<?php
namespace Magento\Setup\Controller;

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

class StartUpdater extends AbstractActionController
{
    private $updaterTaskCreator;

    private $payloadValidator;

    public function __construct(
        \Magento\Setup\Model\UpdaterTaskCreator $updaterTaskCreator,
        \Magento\Setup\Model\PayloadValidator $payloadValidator
    ) {
        $this->updaterTaskCreator = $updaterTaskCreator;
        $this->payloadValidator = $payloadValidator;
    }

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

    public function updateAction()
    {
        $postPayload = Json::decode($this->getRequest()->getContent(), Json::TYPE_ARRAY);
        $errorMessage = '';
        if (isset($postPayload[UpdaterTaskCreator::KEY_POST_PACKAGES])
            && is_array($postPayload[UpdaterTaskCreator::KEY_POST_PACKAGES])
            && isset($postPayload[UpdaterTaskCreator::KEY_POST_JOB_TYPE])
        ) {
            $errorMessage .= $this->payloadValidator->validatePayload($postPayload);
            if (empty($errorMessage)) {
                $errorMessage = $this->updaterTaskCreator->createUpdaterTasks($postPayload);
            }
        } else {
            $errorMessage .= 'Invalid request';
        }
        $success = empty($errorMessage);
        return new JsonModel(['success' => $success, 'message' => $errorMessage]);
    }
}