SubjectReader.php

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<?php
namespace Magento\Braintree\Gateway;

use Braintree\Transaction;
use Magento\Payment\Gateway\Data\PaymentDataObjectInterface;
use Magento\Payment\Gateway\Helper;
use Magento\Vault\Api\Data\PaymentTokenInterface;

class SubjectReader
{
    public function readResponseObject(array $subject)
    {
        $response = Helper\SubjectReader::readResponse($subject);
        if (!isset($response['object']) || !is_object($response['object'])) {
            throw new \InvalidArgumentException('Response object does not exist');
        }

        return $response['object'];
    }

    public function readPayment(array $subject)
    {
        return Helper\SubjectReader::readPayment($subject);
    }

    public function readTransaction(array $subject)
    {
        if (!isset($subject['object']) || !is_object($subject['object'])) {
            throw new \InvalidArgumentException('Response object does not exist.');
        }

        if (!isset($subject['object']->transaction)
            || !$subject['object']->transaction instanceof Transaction
        ) {
            throw new \InvalidArgumentException('The object is not a class \Braintree\Transaction.');
        }

        return $subject['object']->transaction;
    }

    public function readAmount(array $subject)
    {
        return Helper\SubjectReader::readAmount($subject);
    }

    public function readCustomerId(array $subject)
    {
        if (!isset($subject['customer_id'])) {
            throw new \InvalidArgumentException('The "customerId" field does not exists');
        }

        return (int) $subject['customer_id'];
    }

    public function readPublicHash(array $subject)
    {
        if (empty($subject[PaymentTokenInterface::PUBLIC_HASH])) {
            throw new \InvalidArgumentException('The "public_hash" field does not exists');
        }

        return $subject[PaymentTokenInterface::PUBLIC_HASH];
    }

    public function readPayPal(Transaction $transaction)
    {
        if (!isset($transaction->paypal)) {
            throw new \InvalidArgumentException('Transaction has\'t paypal attribute');
        }

        return $transaction->paypal;
    }

    public function readStoreId(array $subject)
    {
        return $subject['store_id'] ?? null;
    }
}