public function getCredentials()
    {
        $auth = $this->request->getHeader('Authorization');

        if (!$auth) {
            return null;
        }

        if ('basic ' !== strtolower(substr($auth, 0, 6))) {
            return null;
        }

        $credentials = explode(':', base64_decode(substr($auth, 6)), 2);

        if (2 !== count($credentials)) {
            return null;
        }

        return $credentials;
    }