SetRememberMeStatusForAjaxLoginObserver.php

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<?php
namespace Magento\Persistent\Observer;

use Magento\Framework\Event\Observer;

use Magento\Framework\Event\ObserverInterface;

class SetRememberMeStatusForAjaxLoginObserver implements ObserverInterface
{
    protected $_persistentSession;

    protected $_persistentData = null;

    private $serializer;

    public function __construct(
        \Magento\Persistent\Helper\Data $persistentData,
        \Magento\Persistent\Helper\Session $persistentSession,
        \Magento\Framework\Serialize\Serializer\Json $serializer = null
    ) {
        $this->_persistentData = $persistentData;
        $this->_persistentSession = $persistentSession;
        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
    }

    public function execute(Observer $observer)
    {
        if (!$this->_persistentData->canProcess($observer)
            || !$this->_persistentData->isEnabled()
            || !$this->_persistentData->isRememberMeEnabled()
        ) {
            return;
        }

        $request = $observer->getEvent()->getRequest();
        if ($request && $request->isXmlHttpRequest()) {
            $requestData = [];
            $content = $request->getContent();
            if ($content) {
                $requestData = $this->serializer->unserialize($content);
            }
            $isRememberMeChecked = empty($requestData['persistent_remember_me']) ? false : true;
            $this->_persistentSession->setRememberMeChecked((bool)$isRememberMeChecked);
        }
    }
}