ClientCredentialTokenProvider.php

<?php
 
declare(strict_types=1);
namespace Commercetools\Client;
 
use GuzzleHttp\ClientInterface;
 
class ClientCredentialTokenProvider implements TokenProvider
{
    public const GRANT_TYPE_CLIENT_CREDENTIALS = 'client_credentials';
    public const GRANT_TYPE = 'grant_type';
    public const SCOPE = 'scope';
    public const ACCESS_TOKEN = 'access_token';
    public const EXPIRES_IN = 'expires_in';
 
    private $client;
 
    private $accessTokenUrl;
 
    private $credentials;
 
    public function __construct(ClientInterface $client, string $accessTokenUrl, ClientCredentials $credentials)
    {
        $this->client = $client;
        $this->accessTokenUrl = $accessTokenUrl;
        $this->credentials = $credentials;
    }
 
    public function getToken(): Token
    {
        $data = [
            self::GRANT_TYPE => self::GRANT_TYPE_CLIENT_CREDENTIALS
        ];
        if (!is_null($this->credentials->getScope())) {
            $data[self::SCOPE] = $this->credentials->getScope();
        }
        $options = [
            'form_params' => $data,
            'auth' => [$this->credentials->getClientId(), $this->credentials->getClientSecret()]
        ];
 
        $result = $this->client->request("post", $this->accessTokenUrl, $options);
 
        $body = json_decode((string)$result->getBody(), true);
        return new TokenModel((string)$body[self::ACCESS_TOKEN], (int)$body[self::EXPIRES_IN]);
    }
 
    public function refreshToken(): Token
    {
        return $this->getToken();
    }
}