Cancel.php

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

use Magento\Framework\Controller\ResultFactory;

class Cancel extends \Magento\Paypal\Controller\Express\AbstractExpress
{
    public function execute()
    {
        try {
            $this->_initToken(false);
            // TODO verify if this logic of order cancellation is deprecated
            // if there is an order - cancel it
            $orderId = $this->_getCheckoutSession()->getLastOrderId();
            $order = $orderId ? $this->_orderFactory->create()->load($orderId) : false;
            if ($order && $order->getId() && $order->getQuoteId() == $this->_getCheckoutSession()->getQuoteId()) {
                $order->cancel()->save();
                $this->_getCheckoutSession()
                    ->unsLastQuoteId()
                    ->unsLastSuccessQuoteId()
                    ->unsLastOrderId()
                    ->unsLastRealOrderId();
                $this->messageManager->addSuccessMessage(
                    __('Express Checkout and Order have been canceled.')
                );
            } else {
                $this->messageManager->addSuccessMessage(
                    __('Express Checkout has been canceled.')
                );
            }
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $this->messageManager->addExceptionMessage($e, $e->getMessage());
        } catch (\Exception $e) {
            $this->messageManager->addExceptionMessage($e, __('Unable to cancel Express Checkout'));
        }

        $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
        return $resultRedirect->setPath('checkout/cart');
    }
}