IsAllowedGuestCheckoutObserver.php

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<?php
namespace Magento\Downloadable\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Store\Model\ScopeInterface;

class IsAllowedGuestCheckoutObserver implements ObserverInterface
{
    const XML_PATH_DISABLE_GUEST_CHECKOUT = 'catalog/downloadable/disable_guest_checkout';

    protected $_scopeConfig;

    public function __construct(
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
    ) {
        $this->_scopeConfig = $scopeConfig;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $store = $observer->getEvent()->getStore();
        $result = $observer->getEvent()->getResult();

        if (!$this->_scopeConfig->isSetFlag(
            self::XML_PATH_DISABLE_GUEST_CHECKOUT,
            ScopeInterface::SCOPE_STORE,
            $store
        )) {
            return $this;
        }

        /* @var $quote \Magento\Quote\Model\Quote */
        $quote = $observer->getEvent()->getQuote();

        foreach ($quote->getAllItems() as $item) {
            if (($product = $item->getProduct())
                && $product->getTypeId() == \Magento\Downloadable\Model\Product\Type::TYPE_DOWNLOADABLE
            ) {
                $result->setIsAllowed(false);
                break;
            }
        }

        return $this;
    }
}