CheckExpirePersistentQuoteObserver.php

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<?php
namespace Magento\Persistent\Observer;

use Magento\Framework\Event\ObserverInterface;

class CheckExpirePersistentQuoteObserver implements ObserverInterface
{
    protected $_customerSession;

    protected $_checkoutSession;

    protected $_eventManager = null;

    protected $_persistentSession = null;

    protected $quoteManager;

    protected $_persistentData = null;

    private $request;

    private $checkoutPagePath = 'checkout';

    public function __construct(
        \Magento\Persistent\Helper\Session $persistentSession,
        \Magento\Persistent\Helper\Data $persistentData,
        \Magento\Persistent\Model\QuoteManager $quoteManager,
        \Magento\Framework\Event\ManagerInterface $eventManager,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Framework\App\RequestInterface $request
    ) {
        $this->_persistentSession = $persistentSession;
        $this->quoteManager = $quoteManager;
        $this->_customerSession = $customerSession;
        $this->_checkoutSession = $checkoutSession;
        $this->_eventManager = $eventManager;
        $this->_persistentData = $persistentData;
        $this->request = $request;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        if (!$this->_persistentData->canProcess($observer)) {
            return;
        }

        if ($this->_persistentData->isEnabled() &&
            !$this->_persistentSession->isPersistent() &&
            !$this->_customerSession->isLoggedIn() &&
            $this->_checkoutSession->getQuoteId() &&
            !$this->isRequestFromCheckoutPage($this->request)
            // persistent session does not expire on onepage checkout page
        ) {
            $this->_eventManager->dispatch('persistent_session_expired');
            $this->quoteManager->expire();
            $this->_customerSession->setCustomerId(null)->setCustomerGroupId(null);
        }
    }

    private function isRequestFromCheckoutPage(\Magento\Framework\App\RequestInterface $request): bool
    {
        $requestUri = (string)$request->getRequestUri();
        $refererUri = (string)$request->getServer('HTTP_REFERER');

        $isCheckoutPage = (
            false !== strpos($requestUri, $this->checkoutPagePath) ||
            false !== strpos($refererUri, $this->checkoutPagePath)
        );

        return $isCheckoutPage;
    }
}