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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Paypal\Model\Payflow\Service;

use Laminas\Http\Exception\RuntimeException;
use Laminas\Http\Request;
use Magento\Framework\DataObject;
use Magento\Framework\HTTP\LaminasClient;
use Magento\Framework\HTTP\LaminasClientFactory;
use Magento\Framework\Math\Random;
use Magento\Payment\Model\Method\ConfigInterface;
use Magento\Payment\Model\Method\Logger;
use Magento\Payment\Model\Method\Online\GatewayInterface;

/**
 * Gateway Service
 */
class Gateway implements GatewayInterface
{
    /**
     * @var LaminasClientFactory
     */
    protected $httpClientFactory;

    /**
     * @var Random
     */
    protected $mathRandom;

    /**
     * @var Logger
     */
    protected $logger;

    /**
     * @param LaminasClientFactory $httpClientFactory
     * @param Random $mathRandom
     * @param Logger $logger
     */
    public function __construct(
        LaminasClientFactory $httpClientFactory,
        Random $mathRandom,
        Logger $logger
    ) {
        $this->httpClientFactory = $httpClientFactory;
        $this->mathRandom = $mathRandom;
        $this->logger = $logger;
    }

    /**
     * Post request into gateway
     *
     * @param DataObject $request
     * @param ConfigInterface $config
     *
     * @return DataObject
     * @throws RuntimeException
     */
    public function postRequest(DataObject $request, ConfigInterface $config)
    {
        $result = new DataObject();

        $clientConfig = [
            'maxredirects' => 5,
            'timeout' => 30,
            'verifypeer' => $config->getValue('verify_peer')
        ];

        if ($config->getValue('use_proxy')) {
            $clientConfig['proxy'] = $config->getValue('proxy_host')
                . ':'
                . $config->getValue('proxy_port');
            $clientConfig['httpproxytunnel'] = true;
            $clientConfig['proxytype'] = CURLPROXY_HTTP;
        }

        /** @var LaminasClient $client */
        $client = $this->httpClientFactory->create();

        $client->setUri(
            (bool)$config->getValue('sandbox_flag')
            ? $config->getValue('transaction_url_test_mode')
            : $config->getValue('transaction_url')
        );
        $client->setOptions($clientConfig);
        $client->setMethod(Request::METHOD_POST);
        $requestData = $this->prepareRequestData($request->getData());
        $client->setParameterPost($requestData);
        $client->setHeaders(
            [
                'X-VPS-VIT-CLIENT-CERTIFICATION-ID' => '33baf5893fc2123d8b191d2d011b7fdc',
                'X-VPS-Request-ID' => $this->mathRandom->getUniqueHash(),
                'X-VPS-CLIENT-TIMEOUT' => 45
            ]
        );
        $client->setUrlEncodeBody(false);

        try {
            $response = $client->send();
            $responseArray = $this->parseNVP(strstr($response->getBody(), 'RESULT'));

            $result->setData(array_change_key_case($responseArray, CASE_LOWER));
            $result->setData('result_code', $result->getData('result'));
        } catch (RuntimeException $e) {
            $result->addData(
                [
                    'response_code' => -1,
                    'response_reason_code' => $e->getCode(),
                    'response_reason_text' => $e->getMessage()
                ]
            );
            throw $e;
        } finally {
            $this->logger->debug(
                [
                    'request' => $requestData,
                    'result' => $result->getData()
                ],
                (array)$config->getValue('getDebugReplacePrivateDataKeys'),
                (bool)$config->getValue('debug')
            );
        }

        return $result;
    }

    /**
     * Add length tag to parameters name which contains special characters: =, &
     *
     * The length tag specifies the exact number of characters and spaces (number of bytes) that appear in the value
     * eg ['COMPANYNAME[14]' => 'Ruff & Johnson')]
     *
     * @param array $data
     * @return array
     */
    private function prepareRequestData(array $data): array
    {
        $requestData = [];
        foreach ($data as $k => $v) {
            if (is_string($v) && (strpos($v, '&') !== false || strpos($v, '=') !== false)) {
                $requestData[$k . '[' . strlen($v) . ']'] = $v;
            } else {
                $requestData[$k] = $v;
            }
        }
        return $requestData;
    }

    /**
     * Parse NVP string into array
     *
     * Use length tag (if present) to parse the key value.
     *
     * The length tag specifies the exact number of characters and spaces (number of bytes) that appear in the value
     * e.g COMPANYNAME[14]=Ruff & Johnson
     * e.g COMMENT1[7]=Level=5
     *
     * @param string $nvp
     * @return array
     */
    private function parseNVP(string $nvp): array
    {
        $result = [];
        while (strlen($nvp) > 0) {
            $keyPos = strpos($nvp, '=');
            if ($keyPos !== false) {
                $key = substr($nvp, 0, $keyPos);
                if (preg_match('/\[(\d+)]$/', $key, $keyParts)) {
                    $valueLength = (int) $keyParts[1];
                    $key = substr($key, 0, strpos($key, '['));
                    $result[$key] = substr($nvp, $keyPos + 1, $valueLength);
                    $valuePos = $keyPos + 1 + $valueLength;
                } else {
                    $valuePos = strpos($nvp, '&') ? strpos($nvp, '&') : strlen($nvp);
                    $value = substr($nvp, $keyPos + 1, $valuePos - $keyPos - 1);
                    $result[$key] = $value;
                }
                $nvp = substr($nvp, $valuePos + 1);
            } else {
                $nvp = '';
            }
        }
        return $result;
    }
}