Logout.php

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<?php
namespace Magento\Customer\Controller\Account;

use Magento\Framework\App\Action\HttpPostActionInterface;
use Magento\Framework\App\Action\HttpGetActionInterface;
use Magento\Customer\Model\Session;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Stdlib\Cookie\CookieMetadataFactory;
use Magento\Framework\Stdlib\Cookie\PhpCookieManager;
use Magento\Customer\Controller\AbstractAccount;

class Logout extends AbstractAccount implements HttpGetActionInterface, HttpPostActionInterface
{
    protected $session;

    private $cookieMetadataFactory;

    private $cookieMetadataManager;

    public function __construct(
        Context $context,
        Session $customerSession
    ) {
        $this->session = $customerSession;
        parent::__construct($context);
    }

    private function getCookieManager()
    {
        if (!$this->cookieMetadataManager) {
            $this->cookieMetadataManager = ObjectManager::getInstance()->get(PhpCookieManager::class);
        }
        return $this->cookieMetadataManager;
    }

    private function getCookieMetadataFactory()
    {
        if (!$this->cookieMetadataFactory) {
            $this->cookieMetadataFactory = ObjectManager::getInstance()->get(CookieMetadataFactory::class);
        }
        return $this->cookieMetadataFactory;
    }

    public function execute()
    {
        $lastCustomerId = $this->session->getId();
        $this->session->logout()->setBeforeAuthUrl($this->_redirect->getRefererUrl())
            ->setLastCustomerId($lastCustomerId);
        if ($this->getCookieManager()->getCookie('mage-cache-sessid')) {
            $metadata = $this->getCookieMetadataFactory()->createCookieMetadata();
            $metadata->setPath('/');
            $this->getCookieManager()->deleteCookie('mage-cache-sessid', $metadata);
        }

        $resultRedirect = $this->resultRedirectFactory->create();
        $resultRedirect->setPath('*/*/logoutSuccess');
        return $resultRedirect;
    }
}