Cognito SSO Client Library

The client library handles all of the communication between the client application and the SSO broker.

This client library is intended to be used with the following projects:

1. Cognito Identity Broker -- This is the Cognito identity broker API stack.

2. SSO Broker Web -- This is the identity broker web app that allows single sign and communicates with the Cognito Identity Broker API.

3. Client App -- An example client application that communicates with the SSO Broker using this client library.

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Using the Client Library

To setup the communications between a client app and the SSO broker, 3 pieces of configuration are needed:

1. An iframe that allows the communication between the client and broker

<iframe
    style={{ display: "none" }}
    ref={authFrameRef}
    id="authFrame"
    sandbox="allow-same-origin allow-scripts"
    src={BROKER_CLIENT_URL}
></iframe>

2. Initialization of the SSO Client library

SsoClient.initialize(
  BROKER_URL,
  CLIENT_ID,
  REDIRECT_URI,
  authFrameRef.current as HTMLIFrameElement,
  {
    logLevel: LogLevel.info,
  },
  () => {
    const state = getClientState();
    SsoClient.authenticate({ redirect: true }, state);
  },
);

3. Create a callback function and register it

This will be called when the SSO broker has a ResponseMessage for the client app. Callbacks can be registered in 2 ways:

1. Global -- These are created/removed via SSOClient.registerCallback
2. Single Instance -- These are 1 time use callbacks on action methods (e.g. authenticate, redeemCode, refreshToken, etc.)

const onAuthResponse = (r: ResponseMessage) => {
  const { user, isAuthenticated = false } = r.details;
  //logic goes here
};

SsoClient.registerCallback("default", onAuthResponse);

---

Client Properties

interface SSOClient {
  clientId: string              //The client id for the app
  redirectUri: string           //The registered Client redirect Uri
  ssoUrl: string                //The URL of the SSO Broker site
  iFrame: HTMLIFrameElement     //A reference to the auth iframe
  callbacks: FunctionCallbacks  //The callback methods that handle responses
  authentication?: Tokens       //The user's authentication tokens
  user?: User                   //The current user
}

Client Methods

Initialize

Sets up the communication between the client and the SSO Broker.

function initialize(
    ssoUrl: string,
    clientId: string,
    redirectUri: string,
    authFrame: HTMLIFrameElement,
    options?: {
        autoRefresh?: boolean;
        logLevel?: LogLevel;
    },
    callback?: (message: ResponseMessage) => void
) {};

Parameters:

• ssoUrl -- The URL of the Cognito SSO Identity Broker site
• clientId -- The designated client id for the app
• redirectUri -- A registered redirect URI for the client app
• authFrame -- The iframe element with auth component
• options -- Available options
  • autoRefresh -- Determines if the activity monitor is used to keep the user's tokens refreshed automatically while the user is active. (default: true)
  • logLevel -- The level of logging that is sent to the console (default: LogLevel.info)
• callback -- A callback method that is called when this action is complete

---

Register Callback

Registers a callback that will receive all messages from the SSO Broker

function registerCallback(id: string, callback: (message: ResponseMessage) => void) {};

Parameters:

• id -- A unique ID that describes the callback function
• callback -- A callback that will receive all messages from the SSO Broker

---

Unregister Callback

Unregisters a callback by its id

function unregisterCallback(id: string) {};

Parameters:

• id -- The ID of a registered callback

---

Authenticate

Checks the current authentication state for the user and will initiate the code flow if required.

function authenticate(
    options: {
        redirect: boolean;
    },
    clientState?: ClientState,
    callback?: (message: ResponseMessage) => void,
) {};

Parameters:

• options -- Authenticate options
  • redirect -- Indicates the user should be redirected to the identity broker if not authenticated
• clientState -- An object representing any state that should be sent to the broker and returned on redirects
• callback -- A callback method that is called when this action is complete

---

Initiate Code Flow

Starts the Authorization Code Flow process by redirecting the user to the SSO Broker regardless of existing authentication.

function initiateCodeFlow(clientState?: ClientState) {};

Parameters:

• clientState -- An object representing any state that should be sent to the broker and returned on redirects

---

Redeem Code

Exchanges an authentication code for tokens

function redeemAuthenticationCode(
    code: string,
    clientState?: ClientState,
    callback?: (message: ResponseMessage) => void,
) {};

Parameters:

• clientState -- An object representing any state that should be sent to the broker and returned on redirects
• code -- An authorization code obtained via the Intitiate Code Flow process.
• callback -- A callback method that is called when this action is complete

---

Refresh Tokens

Refreshes the users id and access token using the user's current/valid refresh token.

function refreshTokens(clientState?: ClientState, callback?: (message: ResponseMessage) => void) {};

Parameters:

• clientState -- An object representing any state that should be sent to the broker and returned on redirects
• callback -- A callback method that is called when this action is complete

---

Logout

Logs the user out of the client application and the SSO Broker

function logout(
    options: {
        clientOnly: boolean;
        redirect: boolean;
    },
    clientState: ClientState,
    callback?: (message: ResponseMessage) => void,
) {};

Parameters:

• options -- Logout Options
  • clientOnly -- Determines whether the user is logged out of both SSO and the client app, or just the client.
  • redirect -- Determines if the user will be redirected to the identity broker if not authenticated
• clientState -- An object representing any state that should be sent to the broker and returned on redirects
• callback -- A callback method that is called when this action is complete