CreateEmptyCart.php

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<?php
declare(strict_types=1);

namespace Magento\QuoteGraphQl\Model\Resolver\Cart;

use Magento\Authorization\Model\UserContextInterface;
use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Query\ResolverInterface;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
use Magento\Quote\Api\CartManagementInterface;
use Magento\Quote\Api\GuestCartManagementInterface;
use Magento\Quote\Model\QuoteIdToMaskedQuoteIdInterface;

class CreateEmptyCart implements ResolverInterface
{
    private $cartManagement;

    private $guestCartManagement;

    private $quoteIdToMaskedId;

    private $userContext;

    public function __construct(
        CartManagementInterface $cartManagement,
        GuestCartManagementInterface $guestCartManagement,
        UserContextInterface $userContext,
        QuoteIdToMaskedQuoteIdInterface $quoteIdToMaskedId
    ) {
        $this->cartManagement = $cartManagement;
        $this->guestCartManagement = $guestCartManagement;
        $this->userContext = $userContext;
        $this->quoteIdToMaskedId = $quoteIdToMaskedId;
    }

    public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
    {
        $customerId = $this->userContext->getUserId();

        if (0 !== $customerId && null !== $customerId) {
            $quoteId = $this->cartManagement->createEmptyCartForCustomer($customerId);
            $maskedQuoteId = $this->quoteIdToMaskedId->execute($quoteId);
        } else {
            $maskedQuoteId = $this->guestCartManagement->createEmptyCart();
        }

        return $maskedQuoteId;
    }
}