A simple page to demonstrate the SSO integration using simple JS for a website.

Connect to the SSO service, via a websocket client:

window.socket = new WebSocket("wss://sso.nexusmods.com");

Once connected, retrieve the request ID and connection_token used on the previous connection.

// retrieve previous uuid and token
uuid = sessionStorage.getItem("uuid");
token = sessionStorage.getItem("connection_token");

Or, if this is the first connection, just generate a random uuid, a token is not needed for first connection

uuid = uuidv4();
token = null;
sessionStorage.setItem('uuid', uuid);
var data = {
    id: uuid,
    token: token,
    protocol: 2
};

// Send the request
socket.send(JSON.stringify(data));

This has informed the SSO server that we are ready to received the user's approval. Once the request is sent, the SSO will send a message back with the connection_token mentioned above - this is only used on subsequent connections (usually due to disconnects and network errors). The response from the SSO will look something like this:

{"success":true,"data":{"connection_token":"X5SjO3P4i8tiBgMdYVTCh3z57ZnWVK5z"},"error":null}

The response will always contain a success attribute, along with error, to be used for error reporting.

The browser can now be opened and the authorise page can be shown.

// Open the browser window, using the uuid and your application's reference
window.open("https://www.nexusmods.com/sso?id="+uuid+"&application="+application_slug);

Note: an application reference can only be generated by Nexus Mods staff. Please, contact the Community Team for further instructions.

The user will be shown an 'authorise' page, or the login page if they are not logged in. Once they have authorised the token, the API key will be sent through the websocket in the following format

{"success":true,"data":{"api_key":"VX2PMnc4T5Q3dUFmjE45WyRyZ3VkKzIvYVJiMUdick5XQU9QWHdUbFo4..."},"error":null}

This API key can be stored by the client and sent as a header for every HTTP request for the API.