/**
 * OAuth request message skeleton for every request.
 * before the final url is generated, it must be run through
 * the oauth Timestamp & Signature generators
 *
 * @constructor
 */
sd.OAuth2.AuthMessage = function(code) {
    var missing_code = (code === undefined);

    this.parameters = missing_code ? { response_type: 'code', client_id: sd.OAuth2.application_key, redirect_uri: sd.OAuth2.close_url } : (code == 'refresh_token') ? { refresh_token: sd.Prefs.get('refresh_token'), grant_type: 'refresh_token', client_id: sd.OAuth2.application_key, client_secret: sd.OAuth2.application_key_secret, redirect_uri: sd.OAuth2.close_url } : { code: code, grant_type: 'authorization_code', client_id: sd.OAuth2.application_key, client_secret: sd.OAuth2.application_key_secret, redirect_uri: sd.OAuth2.close_url };

    this.action = missing_code ? sd.OAuth2.authorize_url : sd.OAuth2.token_url;
    this.method = missing_code ? 'GET' : 'POST'
};