client.php

<?php
namespace Bitrix\Sale\Exchange\Integration\OAuth;
 
 
use Bitrix\Main\Web\HttpClient;
use Bitrix\Main\Web\Json;
 
class Client
{
    private $httpClient;
    protected $accessTokenUrl;
    protected $clientId;
    protected $clientSecret;
 
    public function __construct(array $options = [])
    {
        foreach ($options as $option => $value)
        {
            if (property_exists(self::class, $option))
            {
                $this->{$option} = $value;
            }
        }
 
        $this->httpClient = new HttpClient();
        $this->httpClient->setHeader("User-Agent", "Bitrix IntegrationB24");
        $this->httpClient->setCharset("UTF-8");
    }
 
    public function getAccessTokenUrl(array $params)
    {
        $url = $this->getBaseAccessTokenUrl();
        if ($this->getAccessTokenMethod() === HttpClient::HTTP_GET)
        {
            $query = http_build_query($params, null, "&");
            return $url."?".$query;
        }
 
        return $url;
    }
 
    public function getAccessToken($grant, array $options = [])
    {
        $params = [
            "grant_type" => $grant,
            "client_id" => $this->getClientId(),
            "client_secret" => $this->getClientSecret(),
        ];
 
        $params = array_merge($params, $options);
        $success = $this->httpClient->query($this->getAccessTokenMethod(), $this->getAccessTokenUrl($params));
 
        $response = [];
        if ($success)
        {
            try
            {
                $response = Json::decode($this->httpClient->getResult());
            }
            catch (\Bitrix\Main\ArgumentException $exception)
            {
 
            }
        }
 
        return $response;
    }
 
    protected function getAccessTokenMethod()
    {
        return HttpClient::HTTP_GET;
    }
 
    protected function getBaseAccessTokenUrl()
    {
        return $this->accessTokenUrl;
    }
 
    protected function getClientId()
    {
        return $this->clientId;
    }
 
    protected function getClientSecret()
    {
        return $this->clientSecret;
    }
}