function new_request_token($consumer, $callback = null)
{
$c = Doctrine::getTable('sfOauthServerConsumer')->findOneByConsumerKey($consumer->key);
$key = md5(time());
$secret = time() + time();
$token = new OAuthToken($key, md5(md5($secret)));
$token = new sfOauthServerRequestToken();
$token->setToken($key);
$token->setSecret(md5(md5($secret)));
$token->setConsumer($c);
$token->setScope($c->getScope());
$token->save();
$token = new OAuthToken($token->getToken(), $token->getSecret());
return $token;
}
