InstantPurchaseOption.php

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<?php
namespace Magento\InstantPurchase\Model;

use Magento\Customer\Model\Address;
use Magento\Framework\Exception\LocalizedException;
use Magento\Quote\Api\Data\ShippingMethodInterface;
use Magento\Vault\Api\Data\PaymentTokenInterface;
use InvalidArgumentException;

class InstantPurchaseOption
{
    private $paymentToken;

    private $shippingAddress;

    private $billingAddress;

    private $shippingMethod;

    public function __construct(
        PaymentTokenInterface $paymentToken = null,
        Address $shippingAddress = null,
        Address $billingAddress = null,
        ShippingMethodInterface $shippingMethod = null
    ) {
        $customers = [];
        if ($paymentToken) {
            $customers[] = $paymentToken->getCustomerId();
        }
        if ($shippingAddress) {
            $customers[] = $shippingAddress->getCustomerId();
        }
        if ($billingAddress) {
            $customers[] = $billingAddress->getCustomerId();
        }
        if (count(array_unique($customers)) > 1) {
            throw new InvalidArgumentException('Provided data does not belong to same customer.');
        }

        $this->paymentToken = $paymentToken;
        $this->shippingAddress = $shippingAddress;
        $this->billingAddress = $billingAddress;
        $this->shippingMethod = $shippingMethod;
    }

    public function isAvailable(): bool
    {
        return isset(
            $this->paymentToken,
            $this->shippingAddress,
            $this->billingAddress,
            $this->shippingMethod
        ) && $this->shippingMethod->getAvailable();
    }

    public function getPaymentToken(): PaymentTokenInterface
    {
        if (!isset($this->paymentToken)) {
            throw new LocalizedException(
                __("A payment method isn't defined for instance purchase. Verify and try again.")
            );
        }
        return $this->paymentToken;
    }

    public function getShippingAddress(): Address
    {
        if (!isset($this->shippingAddress)) {
            throw new LocalizedException(__('Shipping address is not defined for instance purchase.'));
        }
        return $this->shippingAddress;
    }

    public function getBillingAddress(): Address
    {
        if (!isset($this->billingAddress)) {
            throw new LocalizedException(__('Billing address is not defined for instance purchase.'));
        }
        return $this->billingAddress;
    }

    public function getShippingMethod(): ShippingMethodInterface
    {
        if (!isset($this->shippingMethod)) {
            throw new LocalizedException(__('Shipping method is not defined for instance purchase.'));
        }
        return $this->shippingMethod;
    }
}