GetPaymentNonceCommand.php

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<?php
namespace Magento\Braintree\Gateway\Command;

use Magento\Braintree\Gateway\SubjectReader;
use Magento\Braintree\Gateway\Validator\PaymentNonceResponseValidator;
use Magento\Braintree\Model\Adapter\BraintreeAdapterFactory;
use Magento\Payment\Gateway\Command\Result\ArrayResultFactory;
use Magento\Payment\Gateway\CommandInterface;
use Magento\Vault\Api\PaymentTokenManagementInterface;

class GetPaymentNonceCommand implements CommandInterface
{

    private $tokenManagement;

    private $adapterFactory;

    private $resultFactory;

    private $subjectReader;

    private $responseValidator;

    public function __construct(
        PaymentTokenManagementInterface $tokenManagement,
        BraintreeAdapterFactory $adapterFactory,
        ArrayResultFactory $resultFactory,
        SubjectReader $subjectReader,
        PaymentNonceResponseValidator $responseValidator
    ) {
        $this->tokenManagement = $tokenManagement;
        $this->adapterFactory = $adapterFactory;
        $this->resultFactory = $resultFactory;
        $this->subjectReader = $subjectReader;
        $this->responseValidator = $responseValidator;
    }

    public function execute(array $commandSubject)
    {
        $publicHash = $this->subjectReader->readPublicHash($commandSubject);
        $customerId = $this->subjectReader->readCustomerId($commandSubject);
        $paymentToken = $this->tokenManagement->getByPublicHash($publicHash, $customerId);
        if (!$paymentToken) {
            throw new \Exception('No available payment tokens');
        }

        $storeId = $this->subjectReader->readStoreId($commandSubject);
        $data = $this->adapterFactory->create($storeId)
            ->createNonce($paymentToken->getGatewayToken());
        $result = $this->responseValidator->validate(['response' => ['object' => $data]]);

        if (!$result->isValid()) {
            throw new \Exception(__(implode("\n", $result->getFailsDescription())));
        }

        return $this->resultFactory->create(['array' => ['paymentMethodNonce' => $data->paymentMethodNonce->nonce]]);
    }
}