132 lines
5 KiB
Text
132 lines
5 KiB
Text
[[_nodejs_adapter]]
|
||
=== Node.js Adapter
|
||
|
||
{{book.project.name}} provides a Node.js adapter to protect JavaScript apps on the server side. The library can be downloaded directly from https://www.npmjs.com/package/keycloak-connect[ {{book.project.name}} organization] and the source is available at
|
||
https://github.com/keycloak/keycloak-nodejs-connect[GitHub].
|
||
|
||
To use the Node.js adapter you must first create a client for your application in the {{book.project.name}} Administration Console. The adapter supports public, confidential and bearer-only access type. Which one to choose depends on the use-case scenario.
|
||
|
||
Once the client is created click on the `Installation` tab select `{{book.project.name}} OIDC JSON` for `Format Option` then click on `Download`. The downloaded `keycloak.json` file should be at the root folder. Exactly, like in https://github.com/keycloak/keycloak-nodejs-connect/tree/master/example[this example].
|
||
|
||
keycloak.json::
|
||
|
||
Alongside the `example.js` lives `keycloak.json` obtained from our {{book.project.name}}
|
||
admin console when we provisioned this app.
|
||
|
||
|
||
{
|
||
"realm": "example-realm",
|
||
"realm-public-key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCrVrCuTtArbgaZzL1hvh0xtL5mc7o0NqPVnYXkLvgcwiC3BjLGw1tGEGoJaXDuSaRllobm53JBhjx33UNv+5z/UMG4kytBWxheNVKnL6GgqlNabMaFfPLPCF8kAgKnsi79NMo+n6KnSY8YeUmec/p2vjO2NjsSAVcWEQMVhJ31LwIDAQAB",
|
||
"auth-server-url": "http://localhost:8080/auth",
|
||
"ssl-required": "external",
|
||
"resource": "example-app",
|
||
"credentials": {
|
||
"secret": "mysecret"
|
||
}
|
||
}
|
||
|
||
==== Installation
|
||
|
||
Assuming you've already installed https://nodejs.org[Node.js], create a folder for your application:
|
||
|
||
mkdir myapp && cd myapp
|
||
|
||
Use `npm init` command to create a `package.json` for your application. And now install the {{book.project.name}} connect adapter in the `myapp` folder, saving it in the dependencies list:
|
||
|
||
npm install --save keycloak-connect
|
||
|
||
==== Usage
|
||
Instantiate a Keycloak class::
|
||
|
||
The `Keycloak` class provides a central point for configuration
|
||
and integration with your application. The simplest creation
|
||
involves no arguments.
|
||
|
||
var keycloak = new Keycloak();
|
||
|
||
By default, this will locate a file named `keycloak.json` alongside
|
||
the main executable of your application to initialize keycloak-specific
|
||
settings (public key, realm name, various URLs). The `keycloak.json` file
|
||
is obtained from the {{book.project.name}} Admin Console.
|
||
|
||
Instantiation with this method results in all of the reasonable defaults
|
||
being used.
|
||
|
||
Configuring a web session store::
|
||
|
||
If you wish to use web sessions to manage
|
||
server-side state for authentication, you will need to initialize the
|
||
`Keycloak(...)` with at least a `store` parameter, passing in the actual
|
||
session store that `express-session` is using.
|
||
|
||
var session = require('express-session');
|
||
var memoryStore = new session.MemoryStore();
|
||
|
||
var keycloak = new Keycloak({ store: memoryStore });
|
||
|
||
Passing a custom scope value::
|
||
|
||
By default, the scope value `openid` will be passed as query parameter to {{book.project.name}}'s login URL but you can add an additional custom value :
|
||
|
||
var keycloak = new Keycloak({ scope: 'offline_access' });
|
||
|
||
==== Install middleware
|
||
|
||
Once instantiated, install the middleware into your connect-capable app:
|
||
|
||
var app = express();
|
||
|
||
app.use( keycloak.middleware() );
|
||
|
||
==== Protect resources
|
||
|
||
Simple authentication::
|
||
|
||
To enforce that a user must be authenticated before accessing a resource,
|
||
simply use a no-argument version of `keycloak.protect()`:
|
||
|
||
app.get( '/complain', keycloak.protect(), complaintHandler );
|
||
|
||
Role-based authorization::
|
||
|
||
To secure a resource with an application role for the current app:
|
||
|
||
app.get( '/special', keycloak.protect('special'), specialHandler );
|
||
|
||
To secure a resource with an application role for a *different* app:
|
||
|
||
app.get( '/extra-special', keycloak.protect('other-app:special', extraSpecialHandler );
|
||
|
||
To secure a resource with a realm role:
|
||
|
||
app.get( '/admin', keycloak.protect( 'realm:admin' ), adminHandler );
|
||
|
||
Advanced authorization::
|
||
|
||
To secure resources based on parts of the URL itself, assuming a role exists
|
||
for each section:
|
||
|
||
function protectBySection(token, request) {
|
||
return token.hasRole( request.params.section );
|
||
}
|
||
|
||
app.get( '/:section/:page', keycloak.protect( protectBySection ), sectionHandler );
|
||
|
||
==== Additional URLs
|
||
|
||
Explicit user-triggered logout::
|
||
|
||
By default, the middleware catches calls to `/logout` to send the user through a
|
||
{{book.project.name}}-centric logout workflow. This can be changed by specifying a `logout`
|
||
configuration parameter to the `middleware()` call:
|
||
|
||
app.use( keycloak.middleware( { logout: '/logoff' } ));
|
||
|
||
{{book.project.name}} Admin Callbacks::
|
||
|
||
Also, the middleware supports callbacks from the {{book.project.name}} console to logout a single
|
||
session or all sessions. By default, these type of admin callbacks occur relative
|
||
to the root URL of `/` but can be changed by providing an `admin` parameter
|
||
to the `middleware()` call:
|
||
|
||
app.use( keycloak.middleware( { admin: '/callbacks' } );
|