AVSResponse.php

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<?php
namespace Magento\Paypal\Model\Payflow\Service\Response\Validator;

use Magento\Framework\DataObject;
use Magento\Paypal\Model\Payflow\Service\Response\ValidatorInterface;
use Magento\Paypal\Model\Payflow\Transparent;

class AVSResponse implements ValidatorInterface
{
    const AVSADDR = 'avsaddr';

    const AVSZIP = 'avszip';

    const IAVS = 'iavs';

    const RESPONSE_YES = 'y';

    const RESPONSE_NO = 'n';

    const RESPONSE_NOT_SUPPORTED = 'x';
    const CONFIG_ON = 1;

    const CONFIG_OFF = 0;
    protected $avsCheck = [
        'avsaddr' => 'avs_street',
        'avszip' => 'avs_zip',
    ];

    protected $errorsMessages = [
        'avs_street' => 'AVS address does not match.',
        'avs_zip' => 'AVS zip does not match.',
    ];

    public function validate(DataObject $response, Transparent $transparentModel)
    {
        $config = $transparentModel->getConfig();
        foreach ($this->avsCheck as $fieldName => $settingName) {
            if ($config->getValue($settingName) == static::CONFIG_ON
                && strtolower((string) $response->getData($fieldName)) === static::RESPONSE_NO
            ) {
                $response->setRespmsg($this->errorsMessages[$settingName]);
                return false;
            }
        }

        return true;
    }
}