PreventExpressCheckoutObserver.php

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<?php
namespace Magento\Persistent\Observer;

use Magento\Framework\Event\ObserverInterface;

class PreventExpressCheckoutObserver implements ObserverInterface
{
    protected $messageManager;

    protected $_url;

    protected $_persistentSession = null;

    protected $_customerSession;

    protected $_expressRedirectHelper;

    public function __construct(
        \Magento\Persistent\Helper\Session $persistentSession,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Framework\UrlInterface $url,
        \Magento\Framework\Message\ManagerInterface $messageManager,
        \Magento\Checkout\Helper\ExpressRedirect $expressRedirectHelper
    ) {
        $this->_persistentSession = $persistentSession;
        $this->_customerSession = $customerSession;
        $this->_url = $url;
        $this->messageManager = $messageManager;
        $this->_expressRedirectHelper = $expressRedirectHelper;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        if (!($this->_persistentSession->isPersistent() && !$this->_customerSession->isLoggedIn())) {
            return;
        }

        $controllerAction = $observer->getEvent()->getControllerAction();
        if (!$controllerAction ||
            !$controllerAction instanceof \Magento\Checkout\Controller\Express\RedirectLoginInterface ||
            $controllerAction->getRedirectActionName() != $controllerAction->getRequest()->getActionName()
        ) {
            return;
        }

        $this->messageManager->addNotice(__('To check out, please sign in using your email address.'));
        $customerBeforeAuthUrl = $this->_url->getUrl('persistent/index/expressCheckout');

        $this->_expressRedirectHelper->redirectLogin($controllerAction, $customerBeforeAuthUrl);
    }
}