イベントで商品IDをクッキーの保存・取得を行う

ProductSubscriber.php

<?php


namespace Customize\EventSubscriber;


use Customize\Service\CheckedProduct;
use Eccube\Common\EccubeConfig;
use Eccube\Event\TemplateEvent;
use Eccube\Repository\ProductRepository;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Cookie;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;

/**
 * 商品詳細ページにアクセスしたときに閲覧履歴の保存と取得をする
 *
 * Class ProductSubscriber
 * @package Customize\EventSubscriber
 */
class ProductSubscriber implements EventSubscriberInterface
{
    /**
     * @var ProductRepository
     */
    private $productRepository;

    /**
     * @var CheckedProduct
     */
    private $checkedProduct;

    /**
     * @var EccubeConfig
     */
    private $eccubeConfig;

    public function __construct(
        ProductRepository $productRepository,
        CheckedProduct $checkedProduct,
        EccubeConfig $eccubeConfig
    )
    {
        $this->productRepository = $productRepository;
        $this->checkedProduct = $checkedProduct;
        $this->eccubeConfig = $eccubeConfig;
    }

    /**
     * @inheritDoc
     */
    public static function getSubscribedEvents()
    {
        // TODO: Implement getSubscribedEvents() method.
        return [
            KernelEvents::RESPONSE => 'onKernelResponse',
            'Product/detail.twig' => 'onTemplateProductDetail'
        ];
    }

    /**
     * クッキーに商品IDを保存
     *
     * @param FilterResponseEvent $event
     * @throws \Exception
     */
    public function onKernelResponse(FilterResponseEvent $event)
    {
        if(false === $event->isMasterRequest()) {
            return;
        }

        if($event->getRequest()->get('_route') !== 'product_detail') {
            return;
        }

        if($product_id = $event->getRequest()->get('id')) {
            $Product = $this->productRepository->find($product_id);

            if(null === $Product) {
                return;
            }

            // 商品IDを追加
            $this->checkedProduct->addProduct($Product);

            // 保持期間1ヶ月
            $expire = new \DateTime();
            $expire->modify("1 month");

            // Cookie作成
            $cookie = new Cookie(
                $this->checkedProduct->getCookieName(),
                implode(',', $this->checkedProduct->getProducts()->toArray()),
                $expire,
                $this->eccubeConfig['env(ECCUBE_COOKIE_PATH)']
            );

            $response = $this->checkedProduct->setCookie($event->getResponse(), $cookie);

            // Cookieをレスポンスにセット
            $event->setResponse($response);
        }
    }

    /**
     * クッキーから商品IDを取得してTwigに値を渡す
     *
     * @param TemplateEvent $event
     */
    public function onTemplateProductDetail(TemplateEvent $event)
    {
        $checkedProducts = [];
        if($products = $this->checkedProduct->getProducts()) {
            foreach($products as $product) {
                if($product = $this->productRepository->find($product)) {
                    $checkedProducts[] = $product;
                }
            }
        }

        $event->setParameter('checkedProducts', $checkedProducts);
    }
}