Rdio::_getOAuth PHP Method

    private function _getOAuth()
    {
        $oauth = new OAuth($this->key, $this->secret, OAUTH_SIG_METHOD_HMACSHA1, OAUTH_AUTH_TYPE_FORM);
        if (isset($_SESSION['access_key']) && isset($_SESSION['access_secret'])) {
            $oauth->setToken($_SESSION['access_key'], $_SESSION['access_secret']);
        } else {
            if (isset($_SESSION['request_key']) && isset($_SESSION['request_secret'])) {
                $oauth->setToken($_SESSION['request_key'], $_SESSION['request_secret']);
            }
        }
        return $oauth;
    }