View.php

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<?php
namespace Magento\Catalog\Controller\Product;

use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;
use Magento\Framework\App\Action\Context;
use Magento\Framework\View\Result\PageFactory;
use Magento\Catalog\Controller\Product as ProductAction;

class View extends ProductAction implements HttpGetActionInterface, HttpPostActionInterface
{
    protected $viewHelper;

    protected $resultForwardFactory;

    protected $resultPageFactory;

    public function __construct(
        Context $context,
        \Magento\Catalog\Helper\Product\View $viewHelper,
        \Magento\Framework\Controller\Result\ForwardFactory $resultForwardFactory,
        PageFactory $resultPageFactory
    ) {
        $this->viewHelper = $viewHelper;
        $this->resultForwardFactory = $resultForwardFactory;
        $this->resultPageFactory = $resultPageFactory;
        parent::__construct($context);
    }

    protected function noProductRedirect()
    {
        $store = $this->getRequest()->getQuery('store');
        if (isset($store) && !$this->getResponse()->isRedirect()) {
            $resultRedirect = $this->resultRedirectFactory->create();
            return $resultRedirect->setPath('');
        } elseif (!$this->getResponse()->isRedirect()) {
            $resultForward = $this->resultForwardFactory->create();
            $resultForward->forward('noroute');
            return $resultForward;
        }
    }

    public function execute()
    {
        // Get initial data from request
        $categoryId = (int) $this->getRequest()->getParam('category', false);
        $productId = (int) $this->getRequest()->getParam('id');
        $specifyOptions = $this->getRequest()->getParam('options');

        if ($this->getRequest()->isPost() && $this->getRequest()->getParam(self::PARAM_NAME_URL_ENCODED)) {
            $product = $this->_initProduct();
            
            if (!$product) {
                return $this->noProductRedirect();
            }
            
            if ($specifyOptions) {
                $notice = $product->getTypeInstance()->getSpecifyOptionMessage();
                $this->messageManager->addNoticeMessage($notice);
            }
            
            if ($this->getRequest()->isAjax()) {
                $this->getResponse()->representJson(
                    $this->_objectManager->get(\Magento\Framework\Json\Helper\Data::class)->jsonEncode([
                        'backUrl' => $this->_redirect->getRedirectUrl()
                    ])
                );
                return;
            }
            $resultRedirect = $this->resultRedirectFactory->create();
            $resultRedirect->setRefererOrBaseUrl();
            return $resultRedirect;
        }

        // Prepare helper and params
        $params = new \Magento\Framework\DataObject();
        $params->setCategoryId($categoryId);
        $params->setSpecifyOptions($specifyOptions);

        // Render page
        try {
            $page = $this->resultPageFactory->create();
            $this->viewHelper->prepareAndRender($page, $productId, $this, $params);
            return $page;
        } catch (\Magento\Framework\Exception\NoSuchEntityException $e) {
            return $this->noProductRedirect();
        } catch (\Exception $e) {
            $this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
            $resultForward = $this->resultForwardFactory->create();
            $resultForward->forward('noroute');
            return $resultForward;
        }
    }
}