Divorce IDAM Express Middleware

Requirements

• Node >=8.0
• yarn

Installation

yarn add @hmcts/div-idam-express-middleware

Available functions

This module exposes three middleware functions that take in an object parameter. These are:

• authenticate - checks if the current user has a valid auth token cookie, if not redirects them to the idam login page with a query parameter args.continueUrl to determine where the user will be sent on successful login
• landingPage - should only run on the page that idam redirects to after successful authentication. This sets auth token cookie based on the jwt query parameter passed back by idam
• protect - checks if the user has a valid auth token cookie, and makes sure it matches against the current session user details. If not, this redirects them to a page defined by the user args.indexUrl
• logout - This makes a request to idam to invalidate the session Jwt token on exit/logout. It provides the jwt token to idam as a path parameter in the http request url.

Arguments

Pass a key-value object into the parameter when making the middleware function call.

const express = require('express');
const idamExpressMiddleware = require('@hmcts/div-idam-express-middleware');

const app = express();
const args = {
  redirectUri: {URL_TO_REDIRECT_TO_AFTER_LOGIN},
  indexUrl: '/index',
  idamApiUrl: {URL_TO_IDAM_API},
  idamLoginUrl: {URL_TO_REDIRECT_USER_TO_LOGIN},
  idamSecret: {IDAM_SECRET},
  idamClientID: {IDAM_CLIENT_ID}
};

app.use(idamExpressMiddleware.userDetails(args));
app.get(paths.login, idamExpressMiddleware.authenticateMiddleware(args));
app.get(paths.redirectUrl, idamExpressMiddleware.landingPage(idamConfig));
app.use(idamExpressMiddleware.protect(args));
app.get(paths.logout, idamExpressMiddleware.logout(args));

NB. as the cookies have secure: true set you need to make browser requests using https. In a deployed environment where we terminate https on a load balancer that is fine, but if you are running without a loadbalancer (most likely localhost) you will need to be using https.

List of available args

• indexUrl (required) - the url for the index page of the service, or whatever page you want the user to be redirected to on auth failure.
• redirectUri (required) - passed to the idamWrapper to determine where to redirect to on successful login. Should create user session and redirect to first logged in page.
• idamClientID (required) - id of service to use idam.
• idamSecrete (required) - secret for service to use idam.
• idamApiUrl (required) - used by the idamWrapper. The url where all API calls will be made to.
• idamLoginUrl (required) - used by the idamWrapper. The url where the user will be redirected to if they require a login for authentication.
• tokenCookieName - the name of the cookie that the jwt token will be saved to. By default is __auth-token.
• stateCookieName - the name of the cookie that stores the state identifier. By default is state.
• hostName - the main service name / url. By default is the PUBLIC_HOSTNAME environment variable.
• state - state to padd the oauth flow. By default is a random string.
• openId - boolean true to use openId endpoints false to use legacy endpoints. By default is false.

OpenId

To use the open id endpoints rather than the legacy endpoints for getting a token and user details add the argument openId when initialising idamExpressMiddleware

const args = {
  redirectUri: {URL_TO_REDIRECT_TO_AFTER_LOGIN},
  indexUrl: '/index',
  idamApiUrl: {URL_TO_IDAM_API},
  idamLoginUrl: {URL_TO_REDIRECT_USER_TO_LOGIN},
  idamSecret: {IDAM_SECRET},
  idamClientID: {IDAM_CLIENT_ID},
  openId: true
};