JsonProductInfo.php

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<?php
namespace Magento\Review\Controller\Adminhtml\Product;

use Magento\Framework\App\Action\HttpGetActionInterface;
use Magento\Review\Controller\Adminhtml\Product as ProductController;
use Magento\Backend\App\Action\Context;
use Magento\Framework\Registry;
use Magento\Review\Model\ReviewFactory;
use Magento\Review\Model\RatingFactory;
use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Framework\DataObject;
use Magento\Framework\Controller\ResultFactory;

class JsonProductInfo extends ProductController implements HttpGetActionInterface
{
    protected $productRepository;

    public function __construct(
        Context $context,
        Registry $coreRegistry,
        ReviewFactory $reviewFactory,
        RatingFactory $ratingFactory,
        ProductRepositoryInterface $productRepository
    ) {
        $this->productRepository = $productRepository;
        parent::__construct($context, $coreRegistry, $reviewFactory, $ratingFactory);
    }

    public function execute()
    {
        $response = new DataObject();
        $id = $this->getRequest()->getParam('id');
        if (intval($id) > 0) {
            $product = $this->productRepository->getById($id);
            $response->setId($id);
            $response->addData($product->getData());
            $response->setError(0);
        } else {
            $response->setError(1);
            $response->setMessage(__('We can\'t retrieve the product ID.'));
        }
        $resultJson = $this->resultFactory->create(ResultFactory::TYPE_JSON);
        $resultJson->setData($response->toArray());
        return $resultJson;
    }
}