Product.php

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<?php
namespace Magento\Review\Controller;

use Magento\Catalog\Model\Product as CatalogProduct;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Review\Model\Review;

abstract class Product extends \Magento\Framework\App\Action\Action
{
    protected $coreRegistry = null;

    protected $customerSession;

    protected $reviewSession;

    protected $categoryRepository;

    protected $logger;

    protected $productRepository;

    protected $reviewFactory;

    protected $ratingFactory;

    protected $catalogDesign;

    protected $storeManager;

    protected $formKeyValidator;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Catalog\Api\CategoryRepositoryInterface $categoryRepository,
        \Psr\Log\LoggerInterface $logger,
        \Magento\Catalog\Api\ProductRepositoryInterface $productRepository,
        \Magento\Review\Model\ReviewFactory $reviewFactory,
        \Magento\Review\Model\RatingFactory $ratingFactory,
        \Magento\Catalog\Model\Design $catalogDesign,
        \Magento\Framework\Session\Generic $reviewSession,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\Data\Form\FormKey\Validator $formKeyValidator
    ) {
        $this->storeManager = $storeManager;
        $this->coreRegistry = $coreRegistry;
        $this->customerSession = $customerSession;
        $this->reviewSession = $reviewSession;
        $this->categoryRepository = $categoryRepository;
        $this->logger = $logger;
        $this->productRepository = $productRepository;
        $this->reviewFactory = $reviewFactory;
        $this->ratingFactory = $ratingFactory;
        $this->catalogDesign = $catalogDesign;
        $this->formKeyValidator = $formKeyValidator;

        parent::__construct($context);
    }

    public function dispatch(RequestInterface $request)
    {
        $allowGuest = $this->_objectManager->get(\Magento\Review\Helper\Data::class)->getIsGuestAllowToWrite();
        if (!$request->isDispatched()) {
            return parent::dispatch($request);
        }

        if (!$allowGuest && $request->getActionName() == 'post' && $request->isPost()) {
            if (!$this->customerSession->isLoggedIn()) {
                $this->_actionFlag->set('', self::FLAG_NO_DISPATCH, true);
                $this->customerSession->setBeforeAuthUrl($this->_url->getUrl('*/*/*', ['_current' => true]));
                $this->reviewSession->setFormData(
                    $request->getPostValue()
                )->setRedirectUrl(
                    $this->_redirect->getRefererUrl()
                );
                $this->getResponse()->setRedirect(
                    $this->_objectManager->get(\Magento\Customer\Model\Url::class)->getLoginUrl()
                );
            }
        }

        return parent::dispatch($request);
    }

    protected function initProduct()
    {
        $this->_eventManager->dispatch('review_controller_product_init_before', ['controller_action' => $this]);
        $categoryId = (int)$this->getRequest()->getParam('category', false);
        $productId = (int)$this->getRequest()->getParam('id');

        $product = $this->loadProduct($productId);
        if (!$product) {
            return false;
        }

        if ($categoryId) {
            $category = $this->categoryRepository->get($categoryId);
            $this->coreRegistry->register('current_category', $category);
        }

        try {
            $this->_eventManager->dispatch('review_controller_product_init', ['product' => $product]);
            $this->_eventManager->dispatch(
                'review_controller_product_init_after',
                ['product' => $product, 'controller_action' => $this]
            );
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $this->logger->critical($e);
            return false;
        }

        return $product;
    }

    protected function loadProduct($productId)
    {
        if (!$productId) {
            return false;
        }

        try {
            $product = $this->productRepository->getById($productId);

            if (!in_array($this->storeManager->getStore()->getWebsiteId(), $product->getWebsiteIds())) {
                throw new NoSuchEntityException();
            }

            if (!$product->isVisibleInCatalog() || !$product->isVisibleInSiteVisibility()) {
                throw new NoSuchEntityException();
            }
        } catch (NoSuchEntityException $noEntityException) {
            return false;
        }

        $this->coreRegistry->register('current_product', $product);
        $this->coreRegistry->register('product', $product);

        return $product;
    }
}