protected function getOauthParameters()
    {
        $time = time();

        return array(
            'oauth_consumer_key' => $this->getConsumerKey(),
            'oauth_nonce' => trim(base64_encode($time), '='),
            'oauth_signature_method' => 'HMAC-SHA1',
            'oauth_timestamp' => $time,
            'oauth_token' => $this->getAccessToken(),
            'oauth_version' => '1.0'
        );
    }