[RCU] How to know that a user is connected to Roundcube from a Rails app ?

Hello,

I am making an SSO-like system based on the Roundcube connection and would like to check from a Ruby on Rails App that the user is logged in Roundcube. I have tried to make a HTTP GET request from my Rails app and checking for the existance of the login form on the index.php page.

Here's my rails code

    require 'net/http'      

    url = URI.parse('http://www.mysite.com/dir1/index.php')
    req = Net::HTTP::Get.new(url.path)
    res = Net::HTTP.start(url.host, url.port) {|http|
            http.request(req)
    }

    reg = /<div id="login-form">/
    logged = reg.match(res.body) ? false : true

even though a user is connected in Roundcube my get keep returning the login page. Where am I mistaken ? Or does anyone have a better way of doing this ?

Thank you for your help.

List info: http://lists.roundcube.net/users/