HttpClientFactory.php

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<?php
namespace Magento\Signifyd\Model\SignifydGateway\Client;

use Magento\Framework\HTTP\ZendClient;
use Magento\Framework\HTTP\ZendClientFactory;
use Magento\Framework\Json\EncoderInterface;
use Magento\Signifyd\Model\Config;

class HttpClientFactory
{
    private static $authorizationType = 'Authorization';

    private static $jsonDataType = 'application/json';

    private static $urlSeparator = '/';

    private $config;

    private $clientFactory;

    private $dataEncoder;

    public function __construct(
        Config $config,
        ZendClientFactory $clientFactory,
        EncoderInterface $dataEncoder
    ) {
        $this->config = $config;
        $this->clientFactory = $clientFactory;
        $this->dataEncoder = $dataEncoder;
    }

    public function create($url, $method, array $params = [], $storeId = null): ZendClient
    {
        $apiKey = $this->getApiKey($storeId);
        $apiUrl = $this->buildFullApiUrl($url, $storeId);

        $client = $this->createNewClient();
        $client->setHeaders(
            self::$authorizationType,
            sprintf('Basic %s', base64_encode($apiKey))
        );
        if (!empty($params)) {
            $encodedData = $this->dataEncoder->encode($params);
            $client->setRawData($encodedData, self::$jsonDataType);
        }
        $client->setMethod($method);
        $client->setUri($apiUrl);

        return $client;
    }

    private function createNewClient()
    {
        return $this->clientFactory->create();
    }

    private function getApiKey($storeId): string
    {
        return $this->config->getApiKey($storeId);
    }

    private function buildFullApiUrl($url, $storeId): string
    {
        $baseApiUrl = $this->getBaseApiUrl($storeId);
        $fullUrl = $baseApiUrl . self::$urlSeparator . ltrim($url, self::$urlSeparator);

        return $fullUrl;
    }

    private function getBaseApiUrl($storeId): string
    {
        $baseApiUrl = $this->config->getApiUrl($storeId);

        return rtrim($baseApiUrl, self::$urlSeparator);
    }
}