CurrentCustomer.php

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<?php
namespace Magento\Customer\Helper\Session;

use Magento\Customer\Api\CustomerRepositoryInterface;
use Magento\Customer\Api\Data\CustomerInterfaceFactory;
use Magento\Customer\Model\Session as CustomerSession;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\App\ViewInterface;
use Magento\Framework\Module\Manager as ModuleManager;
use Magento\Framework\View\LayoutInterface;

class CurrentCustomer
{
    protected $customerSession;

    protected $layout;

    protected $customerFactory;

    protected $customerRepository;

    protected $request;

    protected $moduleManager;

    protected $view;

    public function __construct(
        CustomerSession $customerSession,
        LayoutInterface $layout,
        CustomerInterfaceFactory $customerFactory,
        CustomerRepositoryInterface $customerRepository,
        RequestInterface $request,
        ModuleManager $moduleManager,
        ViewInterface $view
    ) {
        $this->customerSession = $customerSession;
        $this->layout = $layout;
        $this->customerFactory = $customerFactory;
        $this->customerRepository = $customerRepository;
        $this->request = $request;
        $this->moduleManager = $moduleManager;
        $this->view = $view;
    }

    protected function getDepersonalizedCustomer()
    {
        $customer = $this->customerFactory->create();
        $customer->setGroupId($this->customerSession->getCustomerGroupId());
        return $customer;
    }

    protected function getCustomerFromService()
    {
        return $this->customerRepository->getById($this->customerSession->getId());
    }

    public function getCustomer()
    {
        if ($this->moduleManager->isEnabled('Magento_PageCache')
            && !$this->request->isAjax()
            && $this->view->isLayoutLoaded()
            && $this->layout->isCacheable()
        ) {
            return $this->getDepersonalizedCustomer();
        } else {
            return $this->getCustomerFromService();
        }
    }

    public function getCustomerId()
    {
        return $this->customerSession->getId();
    }

    public function setCustomerId($customerId)
    {
        $this->customerSession->setId($customerId);
    }
}