/**
* Get the URL to redirect to
*
* @param string Return URL
* @param array Extra parameters
* @return string
*/
public function redirect_url($return_url, array $extra = array())
{
// Add the callback URL to the consumer
$this->consumer->callback(URL::site($return_url, true));
// Get a request token for the consumer
$request_token = $this->provider->request_token($this->consumer);
Session::instance()->set('oauth_token', $request_token->token);
Session::instance()->set('oauth_token_secret', $request_token->secret);
// Redirect to the twitter login page
return $this->provider->authorize_url($request_token);
}
