RemovePersistentCookieOnRegisterObserver.php

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<?php
namespace Magento\Persistent\Observer;

use Magento\Framework\Event\ObserverInterface;

class RemovePersistentCookieOnRegisterObserver implements ObserverInterface
{
    protected $_customerSession;

    protected $_persistentSession = null;

    protected $_persistentData = null;

    protected $quoteManager;

    public function __construct(
        \Magento\Persistent\Helper\Session $persistentSession,
        \Magento\Persistent\Helper\Data $persistentData,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Persistent\Model\QuoteManager $quoteManager
    ) {
        $this->quoteManager = $quoteManager;
        $this->_persistentSession = $persistentSession;
        $this->_persistentData = $persistentData;
        $this->_customerSession = $customerSession;
    }

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

        $this->_persistentSession->getSession()->removePersistentCookie();

        if (!$this->_customerSession->isLoggedIn()) {
            $this->_customerSession->setCustomerId(null)->setCustomerGroupId(null);
        }

        $this->quoteManager->setGuest();
    }
}