[keycloak-user] Authenticate a rest api using keycloak access token

[Saransh Kumar]

Hello,

How to get user information like username,name, email etc. from the
keycloak token in server side node js REST API (secured through bearer auth
only )?
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*Code:*

var express = require('express');
var router = express.Router();
var app = express();
var cors = require('cors');
var Keycloak = require('keycloak-connect');
var session = require('express-session');
var memoryStore = new session.MemoryStore();
app.use(session({
  secret: 'c214ad7b-e4f9-4b11-9d79-d25084e7c721',
  resave: false,
  saveUninitialized: true,
  store: memoryStore
}));

var keycloak =new Keycloak({store: memoryStore});
app.use( keycloak.middleware({logout: '/logout', admin: '/',}));

router.options('/', cors());

/* GET users listing. */
//router.get('/',keycloak.protect(),function(req, res, next) {
router.get('/', cors(),function(req, res, next) {
    if (keycloak.protect())
    {
        // How to fetch userInfo here?
        res.send('Reached here!');
    }
    else
    {
        res.send('Failed to authenticate');
    }
});

module.exports = router;

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Also, is there any method so that we can cache the user data from the token
assigned to a particular user, so that whenever request from the same user
comes again with the same token, we need not query keycloak about the user
information?

Thanks in advance
Saransh