Onepage.php

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<?php
namespace Magento\Checkout\Controller;

use Magento\Customer\Api\AccountManagementInterface;
use Magento\Customer\Api\CustomerRepositoryInterface;
use Magento\Framework\Exception\NotFoundException;
use Magento\Framework\App\RequestInterface;

abstract class Onepage extends Action
{
    protected $_sectionUpdateFunctions = [
        'payment-method' => '_getPaymentMethodsHtml',
        'shipping-method' => '_getShippingMethodsHtml',
        'review' => '_getReviewHtml',
    ];

    protected $_order;

    protected $_coreRegistry = null;

    protected $_translateInline;

    protected $_formKeyValidator;

    protected $scopeConfig;

    protected $layoutFactory;

    protected $quoteRepository;

    protected $resultPageFactory;

    protected $resultLayoutFactory;

    protected $resultRawFactory;

    protected $resultJsonFactory;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Customer\Model\Session $customerSession,
        CustomerRepositoryInterface $customerRepository,
        AccountManagementInterface $accountManagement,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Framework\Translate\InlineInterface $translateInline,
        \Magento\Framework\Data\Form\FormKey\Validator $formKeyValidator,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Framework\View\LayoutFactory $layoutFactory,
        \Magento\Quote\Api\CartRepositoryInterface $quoteRepository,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory,
        \Magento\Framework\View\Result\LayoutFactory $resultLayoutFactory,
        \Magento\Framework\Controller\Result\RawFactory $resultRawFactory,
        \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory
    ) {
        $this->_coreRegistry = $coreRegistry;
        $this->_translateInline = $translateInline;
        $this->_formKeyValidator = $formKeyValidator;
        $this->scopeConfig = $scopeConfig;
        $this->layoutFactory = $layoutFactory;
        $this->quoteRepository = $quoteRepository;
        $this->resultPageFactory = $resultPageFactory;
        $this->resultLayoutFactory = $resultLayoutFactory;
        $this->resultRawFactory = $resultRawFactory;
        $this->resultJsonFactory = $resultJsonFactory;
        parent::__construct(
            $context,
            $customerSession,
            $customerRepository,
            $accountManagement
        );
    }

    public function dispatch(RequestInterface $request)
    {
        $this->_request = $request;
        $result = $this->_preDispatchValidateCustomer();
        if ($result instanceof \Magento\Framework\Controller\ResultInterface) {
            return $result;
        }

        $quote = $this->_objectManager->get(\Magento\Checkout\Model\Session::class)->getQuote();
        if ($quote->isMultipleShippingAddresses()) {
            $quote->removeAllAddresses();
        }

        if (!$this->_canShowForUnregisteredUsers()) {
            throw new NotFoundException(__('Page not found.'));
        }
        return parent::dispatch($request);
    }

    protected function _ajaxRedirectResponse()
    {
        $resultRaw = $this->resultRawFactory->create();
        $resultRaw->setStatusHeader(403, '1.1', 'Session Expired')
            ->setHeader('Login-Required', 'true');
        return $resultRaw;
    }

    protected function _expireAjax()
    {
        $quote = $this->getOnepage()->getQuote();
        if (!$quote->hasItems() || $quote->getHasError() || !$quote->validateMinimumAmount()) {
            return true;
        }
        $action = $this->getRequest()->getActionName();
        if ($this->_objectManager->get(\Magento\Checkout\Model\Session::class)->getCartWasUpdated(true)
            &&
            !in_array($action, ['index', 'progress'])
        ) {
            return true;
        }

        return false;
    }

    protected function _getHtmlByHandle($handle)
    {
        $layout = $this->layoutFactory->create();
        $layout->getUpdate()->load([$handle]);
        $layout->generateXml();
        $layout->generateElements();
        $output = $layout->getOutput();
        $this->_translateInline->processResponseBody($output);
        return $output;
    }

    protected function _getShippingMethodsHtml()
    {
        return $this->_getHtmlByHandle('checkout_onepage_shippingmethod');
    }

    protected function _getPaymentMethodsHtml()
    {
        return $this->_getHtmlByHandle('checkout_onepage_paymentmethod');
    }

    protected function getProgressHtml($checkoutStep = '')
    {
        $layout = $this->layoutFactory->create();
        $layout->getUpdate()->load(['checkout_onepage_progress']);
        $layout->generateXml();
        $layout->generateElements();

        $block = $layout->getBlock('progress')->setAttribute('next_step', $checkoutStep);
        return $block->toHtml();
    }

    public function getOnepage()
    {
        return $this->_objectManager->get(\Magento\Checkout\Model\Type\Onepage::class);
    }

    protected function _canShowForUnregisteredUsers()
    {
        return $this->_objectManager->get(
            \Magento\Customer\Model\Session::class
        )->isLoggedIn() || $this->getRequest()->getActionName() == 'index' || $this->_objectManager->get(
            \Magento\Checkout\Helper\Data::class
        )->isAllowedGuestCheckout(
            $this->getOnepage()->getQuote()
        ) || !$this->_objectManager->get(
            \Magento\Checkout\Helper\Data::class
        )->isCustomerMustBeLogged();
    }
}