docs(readme): update usage
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README.md
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README.md
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Authenticate socket.io incoming connections with JWTs.
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Compatible with `socket.io >= 3.0`.
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This repository was originally forked from [auth0-socketio-jwt](https://github.com/auth0-community/auth0-socketio-jwt) & it is not intended to take any credit but to improve the code from now on.
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## Installation
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## 💾 Install
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```sh
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npm install socketio-jwt
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npm install --save @thream/socketio-jwt
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```
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## ⚙️ Usage
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```javascript
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// set authorization for socket.io
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io.sockets
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.on(
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'connection',
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socketioJwt.authorize({
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secret: 'your secret or public key',
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timeout: 15000 // 15 seconds to send the authentication message
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})
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)
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.on('authenticated', (socket) => {
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//this socket is authenticated, we are good to handle more events from it.
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console.log(`hello! ${socket.decoded_token.name}`)
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})
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```
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### Server side
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**Note:** If you are using a base64-encoded secret (e.g. your Auth0 secret key), you need to convert it to a Buffer: `Buffer('your secret key', 'base64')`
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```ts
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import { Server } from 'socket.io'
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import socketioJWT from '@thream/socketio-jwt'
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**Client side**
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```javascript
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const socket = io.connect('http://localhost:9000')
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socket.on('connect', () => {
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socket
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.emit('authenticate', { token: jwt }) //send the jwt
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.on('authenticated', () => {
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//do other things
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})
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.on('unauthorized', (msg) => {
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console.log(`unauthorized: ${JSON.stringify(msg.data)}`)
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throw new Error(msg.data.type)
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})
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})
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```
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### One roundtrip
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The previous approach uses a second roundtrip to send the jwt. There is a way you can authenticate on the handshake by sending the JWT as a query string, the caveat is that intermediary HTTP servers can log the url.
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```javascript
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const io = require('socket.io')(server)
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const socketioJwt = require('socketio-jwt')
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```
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With socket.io < 1.0:
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```javascript
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io.set(
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'authorization',
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socketioJwt.authorize({
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secret: 'your secret or public key',
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handshake: true
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})
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)
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io.on('connection', (socket) => {
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console.log('hello!', socket.handshake.decoded_token.name)
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})
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```
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With socket.io >= 1.0:
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```javascript
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const io = new Server(9000)
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io.use(
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socketioJwt.authorize({
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secret: 'your secret or public key',
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handshake: true
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authorize({
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secret: 'your secret or public key'
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})
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)
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io.on('connection', (socket) => {
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console.log('hello!', socket.decoded_token.name)
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})
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```
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For more validation options see [auth0/jsonwebtoken](https://github.com/auth0/node-jsonwebtoken).
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**Client side**
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Append the jwt token using query string:
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```javascript
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const socket = io.connect('http://localhost:9000', {
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query: `token=${your_jwt}`
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})
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```
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Append the jwt token using 'Authorization Header' (Bearer Token):
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```javascript
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const socket = io.connect('http://localhost:9000', {
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extraHeaders: { Authorization: `Bearer ${your_jwt}` }
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})
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```
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Both options can be combined or used optionally.
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### Authorization Header Requirement
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Require Bearer Tokens to be passed in as an Authorization Header
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**Server side**:
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```javascript
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io.use(
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socketioJwt.authorize({
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secret: 'your secret or public key',
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handshake: true,
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auth_header_required: true
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})
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)
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```
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### Handling token expiration
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**Server side**
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When you sign the token with an expiration time (example: 60 minutes):
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```javascript
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const token = jwt.sign(user_profile, jwt_secret, { expiresIn: 60 * 60 })
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```
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Your client-side code should handle it as below:
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**Client side**
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```javascript
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socket.on('unauthorized', (error) => {
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if (
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error.data.type == 'UnauthorizedError' ||
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error.data.code == 'invalid_token'
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) {
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// redirect user to login page perhaps?
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console.log('User token has expired')
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io.on('connection', async () => {
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const clients = await io.sockets.allSockets()
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for (const clientId of clients) {
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const client = io.sockets.sockets.get(clientId)
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console.log(client.decodedToken) // we can access the jwt payload of each connected client
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}
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})
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```
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### Handling invalid token
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### Client side
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Token sent by client is invalid.
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```ts
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import { io } from 'socket.io-client'
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**Server side**:
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// Require Bearer Tokens to be passed in as an Authorization Header
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const socket = io('http://localhost:9000', {
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extraHeaders: { Authorization: `Bearer ${yourJWT}` }
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})
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No further configuration needed.
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**Client side**
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Add a callback client-side to execute socket disconnect server-side.
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```javascript
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socket.on('unauthorized', (error, callback) => {
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if (
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error.data.type == 'UnauthorizedError' ||
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error.data.code == 'invalid_token'
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) {
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// redirect user to login page perhaps or execute callback:
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callback()
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// Handling token expiration
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socket.on('connect_error', (error) => {
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if (error.data.type === 'UnauthorizedError') {
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console.log('User token has expired')
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}
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})
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```
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**Server side**
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To disconnect socket server-side without client-side callback:
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```javascript
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io.sockets.on(
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'connection',
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socketioJwt.authorize({
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secret: 'secret goes here',
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// No client-side callback, terminate connection server-side
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callback: false
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})
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)
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```
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**Client side**
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Nothing needs to be changed client-side if callback is false.
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**Server side**
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To disconnect socket server-side while giving client-side 15 seconds to execute callback:
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```javascript
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io.sockets.on(
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'connection',
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socketioJwt.authorize({
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secret: 'secret goes here',
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// Delay server-side socket disconnect to wait for client-side callback
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callback: 15000
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})
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)
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```
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Your client-side code should handle it as below:
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**Client side**
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```javascript
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socket.on('unauthorized', (error, callback) => {
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if (
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error.data.type == 'UnauthorizedError' ||
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error.data.code == 'invalid_token'
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) {
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// redirect user to login page perhaps or execute callback:
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callback()
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console.log('User token has expired')
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}
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})
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```
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### Getting the secret dynamically
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You can pass a function instead of a string when configuring secret.
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This function receives the request, the decoded token and a callback. This
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way, you are allowed to use a different secret based on the request and / or
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the provided token.
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**Server side**
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```javascript
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const SECRETS = {
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user1: 'secret 1',
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user2: 'secret 2'
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}
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io.use(
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socketioJwt.authorize({
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secret: (request, decodedToken, callback) => {
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// SECRETS[decodedToken.userId] will be used as a secret or
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// public key for connection user.
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callback(null, SECRETS[decodedToken.userId])
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},
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handshake: false
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})
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)
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```
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### Altering the value of the decoded token
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You can pass a function to change the value of the decoded token
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```javascript
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io.on(
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'connection',
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socketIOJwt.authorize({
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customDecoded: (decoded) => {
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return 'new decoded token'
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},
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secret: 'my_secret_key',
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decodedPropertyName: 'my_decoded_token'
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})
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)
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io.on('authenticated', (socket) => {
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console.log(socket.my_decoded_token) // new decoded token
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// Listening to events
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socket.on('messages', (data) => {
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console.log(data)
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})
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```
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