DepersonalizePlugin.php

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<?php
namespace Magento\Customer\Model\Layout;

use Magento\PageCache\Model\DepersonalizeChecker;

class DepersonalizePlugin
{
    protected $depersonalizeChecker;

    protected $session;

    protected $customerSession;

    protected $customerFactory;

    protected $visitor;

    protected $customerGroupId;

    protected $formKey;

    public function __construct(
        DepersonalizeChecker $depersonalizeChecker,
        \Magento\Framework\Session\SessionManagerInterface $session,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Customer\Model\CustomerFactory $customerFactory,
        \Magento\Customer\Model\Visitor $visitor
    ) {
        $this->session = $session;
        $this->customerSession = $customerSession;
        $this->customerFactory = $customerFactory;
        $this->visitor = $visitor;
        $this->depersonalizeChecker = $depersonalizeChecker;
    }

    public function beforeGenerateXml(\Magento\Framework\View\LayoutInterface $subject)
    {
        if ($this->depersonalizeChecker->checkIfDepersonalize($subject)) {
            $this->customerGroupId = $this->customerSession->getCustomerGroupId();
            $this->formKey = $this->session->getData(\Magento\Framework\Data\Form\FormKey::FORM_KEY);
        }
        return [];
    }

    public function afterGenerateXml(\Magento\Framework\View\LayoutInterface $subject, $result)
    {
        if ($this->depersonalizeChecker->checkIfDepersonalize($subject)) {
            $this->visitor->setSkipRequestLogging(true);
            $this->visitor->unsetData();
            $this->session->clearStorage();
            $this->customerSession->clearStorage();
            $this->session->setData(\Magento\Framework\Data\Form\FormKey::FORM_KEY, $this->formKey);
            $this->customerSession->setCustomerGroupId($this->customerGroupId);
            $this->customerSession->setCustomer($this->customerFactory->create()->setGroupId($this->customerGroupId));
        }
        return $result;
    }
}