ParamOverriderCartId.php

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<?php
namespace Magento\Quote\Model\Webapi;

use Magento\Authorization\Model\UserContextInterface;
use Magento\Framework\Webapi\Rest\Request\ParamOverriderInterface;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Quote\Api\CartManagementInterface;

class ParamOverriderCartId implements ParamOverriderInterface
{
    private $userContext;

    private $cartManagement;

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

    public function getOverriddenValue()
    {
        try {
            if ($this->userContext->getUserType() === UserContextInterface::USER_TYPE_CUSTOMER) {
                $customerId = $this->userContext->getUserId();

                $cart = $this->cartManagement->getCartForCustomer($customerId);
                if ($cart) {
                    return $cart->getId();
                }
            }
        } catch (NoSuchEntityException $e) {
            throw new NoSuchEntityException(__('Current customer does not have an active cart.'));
        }
        return null;
    }
}