ProductViewCounter.php

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<?php
namespace Magento\Catalog\Block\Ui;

use Magento\Catalog\Api\Data\ProductInterface;
use Magento\Catalog\Ui\DataProvider\Product\ProductRenderCollectorComposite;
use Magento\Framework\Registry;
use Magento\Framework\Serialize\SerializerInterface;
use Magento\Framework\Url;
use Magento\Framework\View\Element\Template;
use Magento\Store\Model\Store;
use Magento\Catalog\Model\ProductRenderFactory;
use Magento\Catalog\Model\ProductRepository;
use Magento\Framework\EntityManager\Hydrator;
use Magento\Store\Model\StoreManager;

class ProductViewCounter extends Template
{
    private $productRepository;

    private $productRenderCollectorComposite;

    private $storeManager;

    private $productRenderFactory;

    private $hydrator;

    private $serialize;

    private $url;

    private $registry;

    public function __construct(
        Template\Context $context,
        ProductRepository $productRepository,
        ProductRenderCollectorComposite $productRenderCollectorComposite,
        StoreManager $storeManager,
        ProductRenderFactory $productRenderFactory,
        Hydrator $hydrator,
        SerializerInterface $serialize,
        Url $url,
        Registry $registry
    ) {
        parent::__construct($context);
        $this->productRepository = $productRepository;
        $this->productRenderCollectorComposite = $productRenderCollectorComposite;
        $this->storeManager = $storeManager;
        $this->productRenderFactory = $productRenderFactory;
        $this->hydrator = $hydrator;
        $this->serialize = $serialize;
        $this->url = $url;
        $this->registry = $registry;
    }

    public function getCurrentProductData()
    {
        $product = $this->registry->registry('product');
        $store = $this->storeManager->getStore();

        if (!$product || !$product->getId()) {
            return $this->serialize->serialize([
                'items' => [],
                'store' => $store->getId(),
                'currency' => $store->getCurrentCurrency()->getCode()
            ]);
        }

        $productRender = $this->productRenderFactory->create();

        $productRender->setStoreId($store->getId());
        $productRender->setCurrencyCode($store->getCurrentCurrencyCode());
        $this->productRenderCollectorComposite
            ->collect($product, $productRender);
        $data = $this->hydrator->extract($productRender);

        $currentProductData = [
            'items' => [
                $product->getId() => $data
            ],
            'store' => $store->getId(),
            'currency' => $store->getCurrentCurrency()->getCode()
        ];

        return $this->serialize->serialize($currentProductData);
    }
}