Session.php

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<?php
namespace Magento\Persistent\Helper;

class Session extends \Magento\Framework\App\Helper\AbstractHelper
{
    protected $_sessionModel;

    protected $_isRememberMeChecked;

    protected $_persistentData;

    protected $_sessionFactory;

    protected $_checkoutSession;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Persistent\Helper\Data $persistentData,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Persistent\Model\SessionFactory $sessionFactory
    ) {
        $this->_persistentData = $persistentData;
        $this->_checkoutSession = $checkoutSession;
        $this->_sessionFactory = $sessionFactory;

        parent::__construct(
            $context
        );
    }

    public function getSession()
    {
        if ($this->_sessionModel === null) {
            $this->_sessionModel = $this->_sessionFactory->create();
            $this->_sessionModel->loadByCookieKey();
        }
        return $this->_sessionModel;
    }

    public function setSession($sessionModel)
    {
        $this->_sessionModel = $sessionModel;
        return $this->_sessionModel;
    }

    public function isPersistent()
    {
        return $this->getSession()->getId() && $this->_persistentData->isEnabled();
    }

    public function isRememberMeChecked()
    {
        if ($this->_isRememberMeChecked === null) {
            //Try to get from checkout session
            $isRememberMeChecked = $this->_checkoutSession->getRememberMeChecked();
            if ($isRememberMeChecked !== null) {
                $this->_isRememberMeChecked = $isRememberMeChecked;
                $this->_checkoutSession->unsRememberMeChecked();
                return $isRememberMeChecked;
            }

            return $this->_persistentData->isEnabled()
                && $this->_persistentData->isRememberMeEnabled()
                && $this->_persistentData->isRememberMeCheckedDefault();
        }

        return (bool)$this->_isRememberMeChecked;
    }

    public function setRememberMeChecked($checked = true)
    {
        $this->_isRememberMeChecked = $checked;
    }
}