Featherjs Keycloak Connector

A Lightweight library to secure feathersjs API with keycloak authentication with both server and client support.

Server Side

Install server library with npm:

• npm install --save feathers-keycloak-connect-server

Import and configure library with feathersjs application object

  import { AuthConfigure } from 'feathers-keycloak-connect-server';
  app.configure(AuthConfigure(keycloakServerOptions));

KeycloakServerOptions is an object with the following fields:

• serverUrl: string, the url to the keycloak server (e.g http://localhost:9000/auth)
• realm: string, the keycloak realm
• clientId: string, the clientId of the configured client in keycloak
• secret: string (optional), the secret key of the configured client in keycloak (this is needed if you want to support permissions in feathersjs) the secret key is available for confidential clients.
• userService: string (optional, default='users'), the user account service configured in feathers.
• serviceIdField: string (optional, default='keycloakId') the id field in the userService where to retrieve user profile for the currently logged in user.

Once configured, the params object in feathers hooks and services will be patched with the user, client, and permissions object.

• user: this contains information about the currently logged in user. if the userService and serviceIdField options are configured then the user information in feathersjs is attached to the user field as profile.
• client: this contains information about which keycloak client was used to generate the jwt sent to feathersjs.
• permissions: (optional) present if the secret field is provided in the keycloakServerOptions. contains a list of keycloak permissions available to the currently logged in user with respect to the client configured in keycloak for use by the feathersjs server.

Hooks available

The library comes with hooks for performing security and access control. You can get the hooks object as follows import { hooks } from 'feathers-keycloak-connect-server'

hooks.protect

this hook checks if a user has logged in and if not will throw an access denied error!. This does not apply to internal server request where the params.provider field is undefined unless explicitly defined.

Example: To restrict the messages service to only logged in users.

import { hooks } from 'feathers-keycloak-connect-server';

app.service('messages').hooks({before: hooks.protect()});

hooks.restrictToOwner

use this to restrict an operation to the owner of the object. e.g. will be to only allow users to update their own profile. The hook takes two fields in the options object:

• idField: where to find the id value in the params.user object defaults to profile._id.

• ownerField: where to find the id value in the restricting service object defaults to _id.

Example: To restrict patching of comments service by only the user who created it.

import { hooks } from 'feathers-keycloak-connect-server';

app.service('comments').hooks({before: {patch: hooks.restrictToOwner({ownerField: 'createdBy'})}});

hooks.hasRealmRole

this checks if the current user has a specific role or roles in the keycloak realm.

takes a string which represent the role we want to check or a list of roles. In the case of a list the user is granted access if he has atleast one of the roles in the list.

Example: restricting user creation to only users with admin role in keycloak.

import { hooks } from 'feathers-keycloak-connect-server';

app.service('users').hooks({before: {create: hooks.hasRealmRole('admin')}});

hooks.hasResourceRole

this is similar to the hasRealmRole hook. However this is checked against a specific resource and not the whole realm. This takes the ResourceAccessOptions object or a list of ResourceAccessOptions.

The ResourceAccessOptions is an object with two required fields

• resource: the keycloak resource (e.g. 'account')
• role: the keycloak reource role (e.g. 'view-profile')

Where a list is provided, access is granted if the user has at least one of the requirements.

Example: Restrict the find method of the users services to only users with the account:view-profile resource-role.

import { hooks } from 'feathers-keycloak-connect-server';

app.service('users').hooks({before: {find: hooks.hasResourceRole({resource: 'account', role: 'view-profile'})}});

hooks.hasPermission

This hook checks if the current users passes the stated permission or atleast one of the group of permissions. For permissions to work you need to provide the secret field when configuring the library in the ``.

Configuring permissions in keycloak can be a little bit confusing check this link on stackoverflow here where people try to explain how to do this.

Example: Restrict the create method of the transactions service in feathersjs to only users who have a transactions:create permission in keycloak.

import { hooks } from 'feathers-keycloak-connect-server'`

app.service('transactions').hooks({before: {create: hooks.hasPermission({resource: 'transactions', scopes: 'create'})}})

The resource and scopes fields when any is ommitted will pick from the feathers service path and method respectively.

This means that the above example can be achieved through

app.service('transactions').hooks({before: {create: hooks.hasPermission()}})

hooks.getUser and hooks.getClient

these are utility hooks to retrieve the current user and client from the context object in the service hook.

Example: getting the current user in your custom hook.

import { hooks } from 'feathers-keycloak-connect-server';

function (options): {
  return async function(context) {
    const user = hooks.getUser(context);
    const client = hooks.getClient(context);
  }
}

Client Side

Install client library with npm:

• npm install --save feathers-keycloak-connect-client

Note: The client side code uses the keycloak-js behind the scence to login to keycloak and retrieve the jwt.

Import and configure library with feathersjs client object

  import { AuthConfigure } from 'feathers-keycloak-connect-client';
  ... configure other libraries ...
  app.configure(AuthConfigure(KeycloakClientConfig));

KeycloakClientConfig is an object with the following fields:

• keycloakConfig: (required) this translate directly to the KeycloakConfig option needed by the keycloak-js library. you can check out the documentation here.
• keycloakInit: (required) this translate directly to the KeycloakInitOptions option needed by the keycloak-js library. you can check out the documentation here.
• loginRedirectUri: (optional defaults to '/') the uri to redirect to after a successful login.
• logoutRedirectUri: (optional defaults to '/') the uri to redirect to after a successful logout.
• scope: (optional) the scope to retrieve from the keycloak server when performing login action.
• minValidity: (optional defaults to 5secs) the minimum validity period before the jwt is refreshed.
• withVueRouter: (optional) this is a boolean value which determines if you are using the library with vue-router or not (defaults to false which means you are using without vue-router).
• vueRouterLink: (optional) this is needed if the withVueRouter option is true but defaults to (/auth). This is the path on vue-router where the vue-router component of this library has to be mounted. More details discussed later.

At the time of writing this documentation the required fields in the KeycloakConfig object are below. check official docs for any possible update or changes here:

• url: the url to the keycloak server (e.g. 'http://localhost:9000/auth').
• realm: the keycloak realm to use.
• clientId: the id of the configured client in keycloak.

At the time of writing this documentation the KeycloakInitOptions has no required fields (only optional fields) check official docs for any possible update or changes here relevant fields include:

• onLoad: action to perform after the library is loaded. options are login-required => checks if user is logged in and redirects to login page if not. Use this option if you want your users to be authenticated before reaching the home page of the app. check-sso => silently checks sso and loads user information if user is already logged in or nothing otherwise.

• enableLogging: boolean value to enable showing of logs in the browser console. Enable this only for debuging purposes.

Other options like adapter, checkLoginIframe, flow are also available. Check docs for more details.

Full Configuration example

import feathers from '@feathersjs/feathers';
import socketio from '@feathersjs/socketio-client';
import io from 'socket.io-client';
import { AuthConfigure } from 'feathers-keycloak-connect-client'

const socket = io('http://localhost:3030');
const app = feathers();

app.configure(socketio(socket));
app.configure(AuthConfigure(KeycloakClientConfig));

app.on('authSuccess', (payload: any) => {
  console.log('login-info', payload);
})

replace the socket.io-client with any other client you want and the steps should be the same. However library has been extensively tested with the socket.io client and guaranteed to work. report any problem you find with other clients.

Using library with vue-router.

Due to the nature and design of the vue-router library, you need to perform additional configuration in order to use this library with vue-router.

The library needs to perform feather processing after redirection from login and the redirection route has to be mounted to the library. this can be done as below.

const app = ... // feathersjs client already configured with the library
const router = ... // configured vue-router object

app.authentication.configureVueRouter(router);

Added properties or attributes

The following properties or attributes are available on the feathers client object after configuration:

authentication

The authentication library itself is accessible through this property.

keycloak

The keycloak object from keycloak-js library is also available here.

Added functions or methods

The following functions or methods are available on the feathers client object after configuration:

authenticated

A function which returns true if user has logged in or false otherwise.

authenticate | login

A function which can be used to trigger the login action. That's redirect user to keycloak for authentication. Parameters are:

• redirectUri: (optional) a redirect URI to override the defualt configured uri.
• params: (optional) this is any parameters that should be sent to the authSuccess event listener after a successful login. This can be used to transfer data between pre and post login session.

• options: (optional) this is an object containing any additional information passed to the login function of the keycloak-js object.

  reAuthenticate (async)

  This is used to manually trigger updating of the existing user token. Token updating is done automatically by the keycloak-js library and you might not need to call this function directly.

  logout

  Use this to logout current user. The takes an optional redirectUri parameter. Redirect to default uri provided during configuration if not provided here.

  accountManagement

  A wrapper around the accountManagement function provided by the keycloak-js object. check documentation here.

  register

  A wrapper around the register function provided by the keycloak-js object. check documentation here. It takes the user to the registration page of keycloak where the user can signup for a new account.

  hasRealmRole

  A wrapper around the hasRealmRole function provided by the keycloak-js object. check documentation here. Use this to check if the current user has a specific realm role in keycloak.

  hasResourceRole

  A wrapper around the hasResourceRole function provided by the keycloak-js object. check documentation here. Use this to check if the current user has a specific resource role.

  loadUserInfo

  A wrapper around the loadUserInfo function provided by the keycloak-js object. check documentation here.

  loadUserProfile

  A wrapper around the loadUserProfile function provided by the keycloak-js object. check documentation here.

  hasPermission

  This is similar to the server side hook hasPermissions. Since most client side apps are configured as public clients in keycloak they do not have access to the permissions. The library circumvents this by returning the permissions from the feathersjs server. This function can then be used to check if the user has a specific permission on the feathersjs server.

  Example: to check if the current user has create permission on the transactions service.

  app.hasPermission({resource: 'transactions', scopes: 'create'})

  Returns true if user has permission, otherwise returns false.

  Added events

  the following events will triggered by the feathers client object after configureation.

  authSuccess

  Will be triggered on successful authentication.

  app.on('authSuccess', (payload) => {
  console.log(payload);
  })

  the payload object has the following fields:

• user: the current user object.

• params: the optional params object passed to the login function.

  authLogout

  Will be triggered on a successful logout.

  authError

  Will be triggered if there is an error during login.

  app.on('authError', (payload) => {
  console.log(payload);
  })

  the payload object has the following fields:

• error: the error oject.
• params: the optional params object passed to the login function.