AbstractExpress.php

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<?php
namespace Magento\Paypal\Controller\Express;

use Magento\Checkout\Controller\Express\RedirectLoginInterface;
use Magento\Framework\App\Action\Action as AppAction;

abstract class AbstractExpress extends AppAction implements RedirectLoginInterface
{
    protected $_checkout;

    protected $_checkoutTypes = [];

    protected $_config;

    protected $_quote = false;

    protected $_configType;

    protected $_configMethod;

    protected $_checkoutType;

    protected $_customerSession;

    protected $_checkoutSession;

    protected $_orderFactory;

    protected $_checkoutFactory;

    protected $_paypalSession;

    protected $_urlHelper;

    protected $_customerUrl;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Sales\Model\OrderFactory $orderFactory,
        \Magento\Paypal\Model\Express\Checkout\Factory $checkoutFactory,
        \Magento\Framework\Session\Generic $paypalSession,
        \Magento\Framework\Url\Helper\Data $urlHelper,
        \Magento\Customer\Model\Url $customerUrl
    ) {
        $this->_customerSession = $customerSession;
        $this->_checkoutSession = $checkoutSession;
        $this->_orderFactory = $orderFactory;
        $this->_checkoutFactory = $checkoutFactory;
        $this->_paypalSession = $paypalSession;
        $this->_urlHelper = $urlHelper;
        $this->_customerUrl = $customerUrl;
        parent::__construct($context);
        $parameters = ['params' => [$this->_configMethod]];
        $this->_config = $this->_objectManager->create($this->_configType, $parameters);
    }

    protected function _initCheckout()
    {
        $quote = $this->_getQuote();
        if (!$quote->hasItems() || $quote->getHasError()) {
            $this->getResponse()->setStatusHeader(403, '1.1', 'Forbidden');
            throw new \Magento\Framework\Exception\LocalizedException(__('We can\'t initialize Express Checkout.'));
        }
        if (!isset($this->_checkoutTypes[$this->_checkoutType])) {
            $parameters = [
                'params' => [
                    'quote' => $quote,
                    'config' => $this->_config,
                ],
            ];
            $this->_checkoutTypes[$this->_checkoutType] = $this->_checkoutFactory
                ->create($this->_checkoutType, $parameters);
        }
        $this->_checkout = $this->_checkoutTypes[$this->_checkoutType];
    }

    protected function _initToken($setToken = null)
    {
        if (null !== $setToken) {
            if (false === $setToken) {
                // security measure for avoid unsetting token twice
                if (!$this->_getSession()->getExpressCheckoutToken()) {
                    throw new \Magento\Framework\Exception\LocalizedException(
                        __('PayPal Express Checkout Token does not exist.')
                    );
                }
                $this->_getSession()->unsExpressCheckoutToken();
            } else {
                $this->_getSession()->setExpressCheckoutToken($setToken);
            }
            return $this;
        }
        $setToken = $this->getRequest()->getParam('token');
        if ($setToken) {
            if ($setToken !== $this->_getSession()->getExpressCheckoutToken()) {
                throw new \Magento\Framework\Exception\LocalizedException(
                    __('A wrong PayPal Express Checkout Token is specified.')
                );
            }
        } else {
            $setToken = $this->_getSession()->getExpressCheckoutToken();
        }
        return $setToken;
    }

    protected function _getSession()
    {
        return $this->_paypalSession;
    }

    protected function _getCheckoutSession()
    {
        return $this->_checkoutSession;
    }

    protected function _getQuote()
    {
        if (!$this->_quote) {
            $this->_quote = $this->_getCheckoutSession()->getQuote();
        }
        return $this->_quote;
    }

    public function getCustomerBeforeAuthUrl()
    {
        return;
    }

    public function getActionFlagList()
    {
        return [];
    }

    public function getLoginUrl()
    {
        return $this->_customerUrl->getLoginUrl();
    }

    public function getRedirectActionName()
    {
        return 'start';
    }

    public function redirectLogin()
    {
        $this->_actionFlag->set('', 'no-dispatch', true);
        $this->_customerSession->setBeforeAuthUrl($this->_redirect->getRefererUrl());
        $this->getResponse()->setRedirect(
            $this->_urlHelper->addRequestParam($this->_customerUrl->getLoginUrl(), ['context' => 'checkout'])
        );
    }
}