GetNonce.php

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<?php
namespace Magento\Braintree\Controller\Payment;

use Magento\Braintree\Gateway\Command\GetPaymentNonceCommand;
use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Magento\Framework\Controller\ResultFactory;
use Magento\Framework\Controller\ResultInterface;
use Magento\Framework\Session\SessionManagerInterface;
use Magento\Framework\Webapi\Exception;
use Psr\Log\LoggerInterface;

class GetNonce extends Action
{
    private $logger;

    private $session;

    private $command;

    public function __construct(
        Context $context,
        LoggerInterface $logger,
        SessionManagerInterface $session,
        GetPaymentNonceCommand $command
    ) {
        parent::__construct($context);
        $this->logger = $logger;
        $this->session = $session;
        $this->command = $command;
    }

    public function execute()
    {
        $response = $this->resultFactory->create(ResultFactory::TYPE_JSON);

        try {
            $publicHash = $this->getRequest()->getParam('public_hash');
            $customerId = $this->session->getCustomerId();
            $result = $this->command->execute(
                ['public_hash' => $publicHash, 'customer_id' => $customerId, 'store_id' => $this->session->getStoreId()]
            )
                ->get();
            $response->setData(['paymentMethodNonce' => $result['paymentMethodNonce']]);
        } catch (\Exception $e) {
            $this->logger->critical($e);
            return $this->processBadRequest($response);
        }

        return $response;
    }

    private function processBadRequest(ResultInterface $response)
    {
        $response->setHttpResponseCode(Exception::HTTP_BAD_REQUEST);
        $response->setData(['message' => __('Sorry, but something went wrong')]);

        return $response;
    }
}