Login.php

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<?php
namespace Magento\Customer\Controller\Account;

use Magento\Framework\App\Action\HttpGetActionInterface;
use Magento\Customer\Model\Session;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\Action\HttpPostActionInterface;
use Magento\Framework\View\Result\PageFactory;
use Magento\Customer\Controller\AbstractAccount;

class Login extends AbstractAccount implements HttpGetActionInterface, HttpPostActionInterface
{
    protected $session;

    protected $resultPageFactory;

    public function __construct(
        Context $context,
        Session $customerSession,
        PageFactory $resultPageFactory
    ) {
        $this->session = $customerSession;
        $this->resultPageFactory = $resultPageFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        if ($this->session->isLoggedIn()) {
            $resultRedirect = $this->resultRedirectFactory->create();
            $resultRedirect->setPath('*/*/');
            return $resultRedirect;
        }

        $resultPage = $this->resultPageFactory->create();
        $resultPage->setHeader('Login-Required', 'true');
        return $resultPage;
    }
}