oauth-popup.haml

:javascript
    window._popup_closed = function(){
        location.href = "#{@my_instance_var_uri_string}"; //  replace the opening window document with this one
        window._popup_closed = null;        //  remove on close callback
    };

    var connect_path = "/auth/#{@platform name}";   //  the oauth destination - there is a route for these
    var new window_specs = "";                    // your window opening parameters

    //  open the new window
    auth_window = window.open(connect_path,null,new_window_specs,false);