CancelResponseValidator.php

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<?php
declare(strict_types=1);

namespace Magento\Braintree\Gateway\Validator;

use Braintree\Error\ErrorCollection;
use Braintree\Error\Validation;
use Magento\Payment\Gateway\Validator\AbstractValidator;
use Magento\Payment\Gateway\Validator\ResultInterface;
use Magento\Payment\Gateway\Validator\ResultInterfaceFactory;
use Magento\Braintree\Gateway\SubjectReader;

class CancelResponseValidator extends AbstractValidator
{
    private static $acceptableTransactionCode = 91504;

    private $generalResponseValidator;

    private $subjectReader;

    public function __construct(
        ResultInterfaceFactory $resultFactory,
        GeneralResponseValidator $generalResponseValidator,
        SubjectReader $subjectReader
    ) {
        parent::__construct($resultFactory);
        $this->generalResponseValidator = $generalResponseValidator;
        $this->subjectReader = $subjectReader;
    }

    public function validate(array $validationSubject): ResultInterface
    {
        $result = $this->generalResponseValidator->validate($validationSubject);
        if (!$result->isValid()) {
            $response = $this->subjectReader->readResponseObject($validationSubject);
            if ($this->isErrorAcceptable($response->errors)) {
                $result = $this->createResult(true, [__('Transaction is cancelled offline.')]);
            }
        }

        return $result;
    }

    private function isErrorAcceptable(ErrorCollection $errorCollection): bool
    {
        $errors = $errorCollection->deepAll();
        // there is should be only one acceptable error
        if (count($errors) > 1) {
            return false;
        }

        $error = array_pop($errors);

        return (int)$error->code === self::$acceptableTransactionCode;
    }
}