Ruby#

This is a minimal server application built for Ruby with Sinatra that allows:

Generating LiveKit tokens on demand for any application client.
Receiving LiveKit webhook events.

Running this tutorial#

1. Run LiveKit Server#

You can run LiveKit locally or you can use their free tier of LiveKit Cloud.

Alternatively, you can use OpenVidu, which is a fully compatible LiveKit distribution designed specifically for on-premises environments. It brings notable improvements in terms of performance, observability and development experience. For more information, visit What is OpenVidu?.

Run OpenVidu locallyDeploy OpenViduRun LiveKit locallyUse LiveKit Cloud

Download OpenVidu

git clone https://github.com/OpenVidu/openvidu-local-deployment

Configure the local deployment

Windows macOS Linux

cd openvidu-local-deployment/community
.\configure_lan_private_ip_windows.bat

cd openvidu-local-deployment/community
./configure_lan_private_ip_macos.sh

cd openvidu-local-deployment/community
./configure_lan_private_ip_linux.sh

Run OpenVidu
```
docker compose up
```

To use a production-ready OpenVidu deployment, visit the official OpenVidu deployment guide.

Configure Webhooks

All application servers have an endpoint to receive webhooks from LiveKit. For this reason, when using a production deployment you need to configure webhooks to point to your local application server in order to make it work. Check the Send Webhooks to a Local Application Server section for more information.

Follow the official instructions to run LiveKit locally.

Configure Webhooks

All application servers have an endpoint to receive webhooks from LiveKit. For this reason, when using LiveKit locally you need to configure webhooks to point to your application server in order to make it work. Check the Webhooks section from the official documentation and follow the instructions to configure webhooks.

Use your account in LiveKit Cloud.

Configure Webhooks

All application servers have an endpoint to receive webhooks from LiveKit. For this reason, when using LiveKit Cloud you need to configure webhooks to point to your local application server in order to make it work. Check the Webhooks section from the official documentation and follow the instructions to configure webhooks.

Expose your local application server

In order to receive webhooks from LiveKit Cloud on your local machine, you need to expose your local application server to the internet. Tools like Ngrok, LocalTunnel, LocalXpose and Zrok can help you achieve this.

These tools provide you with a public URL that forwards requests to your local application server. You can use this URL to receive webhooks from LiveKit Cloud, configuring it as indicated above.

2. Download the tutorial code#

git clone https://github.com/OpenVidu/openvidu-livekit-tutorials.git

3. Run the server application#

To run this server application, you need Ruby installed on your device.

Navigate into the server directory

cd openvidu-livekit-tutorials/application-server/ruby

Install dependencies
```
bundle install
```
Run the application
```
ruby app.rb
```

4. Run a client application to test against this server#

JavaScript React Angular Vue Electron Ionic Android iOS

To run the client application tutorial, you need an HTTP web server installed on your development computer. A great option is http-server. You can install it via NPM:

npm install -g http-server

Navigate into the application client directory:

cd openvidu-livekit-tutorials/application-client/openvidu-js

Serve the application:
```
http-server -p 5080 ./src
```

Once the server is up and running, you can test the application by visiting http://localhost:5080. You should see a screen like this:

Accessing your application client from other devices in your local network

One advantage of running OpenVidu locally is that you can test your application client with other devices in your local network very easily without worrying about SSL certificates.

Access your application client through https://xxx-yyy-zzz-www.openvidu-local.dev:5443, where xxx-yyy-zzz-www part of the domain is your LAN private IP address with dashes (-) instead of dots (.). For more information, see section Accessing your app from other devices in your network.

For more information, check the JavaScript tutorial.

To run the client application tutorial, you need Node installed on your development computer.

Navigate into the application client directory:

cd openvidu-livekit-tutorials/application-client/openvidu-react

Install dependencies:
```
npm install
```
Run the application:
```
npm start
```

Once the server is up and running, you can test the application by visiting http://localhost:5080. You should see a screen like this:

Accessing your application client from other devices in your local network

One advantage of running OpenVidu locally is that you can test your application client with other devices in your local network very easily without worrying about SSL certificates.

Access your application client through https://xxx-yyy-zzz-www.openvidu-local.dev:5443, where xxx-yyy-zzz-www part of the domain is your LAN private IP address with dashes (-) instead of dots (.). For more information, see section Accessing your app from other devices in your network.

For more information, check the React tutorial.

To run the client application tutorial, you need Node installed on your development computer.

Navigate into the application client directory:

cd openvidu-livekit-tutorials/application-client/openvidu-angular

Install the required dependencies:
```
npm install
```
Serve the application:
```
npm start
```

Once the server is up and running, you can test the application by visiting http://localhost:5080. You should see a screen like this:

Accessing your application client from other devices in your local network

One advantage of running OpenVidu locally is that you can test your application client with other devices in your local network very easily without worrying about SSL certificates.

Access your application client through https://xxx-yyy-zzz-www.openvidu-local.dev:5443, where xxx-yyy-zzz-www part of the domain is your LAN private IP address with dashes (-) instead of dots (.). For more information, see section Accessing your app from other devices in your network.

For more information, check the Angular tutorial.

To run the client application tutorial, you need Node installed on your development computer.

Navigate into the application client directory:

cd openvidu-livekit-tutorials/application-client/openvidu-vue

Install dependencies:
```
npm install
```
Run the application:
```
npm start
```

Once the server is up and running, you can test the application by visiting http://localhost:5080. You should see a screen like this:

Accessing your application client from other devices in your local network

One advantage of running OpenVidu locally is that you can test your application client with other devices in your local network very easily without worrying about SSL certificates.

Access your application client through https://xxx-yyy-zzz-www.openvidu-local.dev:5443, where xxx-yyy-zzz-www part of the domain is your LAN private IP address with dashes (-) instead of dots (.). For more information, see section Accessing your app from other devices in your network.

For more information, check the Vue tutorial.

To run the client application tutorial, you need Node installed on your development computer.

Navigate into the application client directory:

cd openvidu-livekit-tutorials/application-client/openvidu-electron

Install the required dependencies:
```
npm install
```
Run the application:
```
npm start
```

The application will seamlessly initiate as a native desktop program, adapting itself to the specific operating system you are using. Once the application is open, you should see a screen like this:

Running your application client from other devices in your local network

One advantage of running OpenVidu locally is that you can test your application client with other devices in your local network very easily without worrying about SSL certificates. For more information, see section Accessing your app from other devices in your network.

For more information, check the Electron tutorial.

To run the client application tutorial, you need Node installed on your development computer.

Navigate into the application client directory:

cd openvidu-livekit-tutorials/application-client/openvidu-ionic

Install the required dependencies:
```
npm install
```
Serve the application:

You have two options for running the client application: browser-based or mobile device-based:
Browser Mobile
To run the application in a browser, you will need to start the Ionic server. To do so, run the following command:
npm start
Once the server is up and running, you can test the application by visiting http://localhost:5080. You should see a screen like this:

Mobile appearance

To show the app with a mobile device appearance, open the dev tools in your browser and find the button to adapt the viewport to a mobile device aspect ratio. You may also choose predefined types of devices to see the behavior of your app in different resolutions.

Accessing your application client from other devices in your local network

One advantage of running OpenVidu locally is that you can test your application client with other devices in your local network very easily without worrying about SSL certificates.

Access your application client through https://xxx-yyy-zzz-www.openvidu-local.dev:5443, where xxx-yyy-zzz-www part of the domain is your LAN private IP address with dashes (-) instead of dots (.). For more information, see section Accessing your app from other devices in your network.
Running the tutorial on a mobile device presents additional challenges compared to running it in a browser, mainly due to the application being launched on a different device, such as an Android smartphone or iPhone, rather than our computer. To overcome these challenges, the following steps need to be taken:
1. Localhost limitations:
  
  The usage of localhost in our Ionic app is restricted, preventing seamless communication between the application client and the server.
2. Serve over local network:
  
  The application must be served over our local network to enable communication between the device and the server.
3. Secure connection requirement for WebRTC API:
  
  The WebRTC API demands a secure connection for functionality outside of localhost, necessitating the serving of the application over HTTPS.
If you run OpenVidu locally you don't need to worry about this. OpenVidu will handle all of the above requirements for you. For more information, see section Accessing your app from other devices in your network.

Now, let's explore how to run the application on a mobile device:

Requirements

Before running the application on a mobile device, make sure that the device is connected to the same network as your PC and the mobile is connected to the PC via USB or Wi-Fi.
Android device iOS device

npm run android

You will need Ruby and Cocoapods installed in your computer.

The app must be signed with a development team. To do so, open the project in Xcode and select a development team in the Signing & Capabilities editor.

npm run ios
The script will ask you for the device you want to run the application on. You should select the real device you have connected to your computer.

Once the mobile device has been selected, the script will launch the application on the device and you will see a screen like this:

This screen allows you to configure the URLs of the application server and the LiveKit server. You need to set them up for requesting tokens to your application server and connecting to the LiveKit server.

Once you have configured the URLs, you can join a video call room by providing a room name and a user name. After joining the room, you will be able to see your own video and audio tracks, as well as the video and audio tracks of the other participants in the room.

For more information, check the Ionic tutorial.

To run the client application tutorial, you need Android Studio installed on your development computer.

Open Android Studio and import the project located at openvidu-livekit-tutorials/application-client/openvidu-android.
Run the application in an emulator or a physical device by clicking the "Run" button in Android Studio. Check out the official documentation for further information.

The application will initiate as a native Android program. Once the application is opened, you should see a screen like this:

This screen allows you to configure the URLs of the application server and the LiveKit server. You need to set them up for requesting tokens to your application server and connecting to the LiveKit server.

Connecting real Android device to application server running in you local network

One advantage of running OpenVidu locally is that you can test your application client in a real Android device and be able to reach the application server very easily without worrying about SSL certificates if they are both running in the same local network. For more information, see section Accessing your app from other devices in your network.

Once you have configured the URLs, you can join a video call room by providing a room name and a user name. After joining the room, you will be able to see your own video and audio tracks, as well as the video and audio tracks of the other participants in the room.

For more information, check the Android tutorial.

To run the client application tutorial, you need Xcode installed on your MacOS.

Launch Xcode and open the OpenViduIOS.xcodeproj that you can find under openvidu-livekit-tutorials/application-client/openvidu-ios.
Run the application in an emulator or a physical device by clicking on the menu Product > Run or by ⌘R.

Emulator limitations

Publishing the camera track is not supported by iOS Simulator.

If you encounter code signing issues, make sure you change the Team and bundle id from the previous step.

The application will initiate as a native iOS application. Once the app is opened, you should see a screen like this:

This screen allows you to configure the URLs of the application server and the LiveKit server. You need to set them up for requesting tokens to your application server and connecting to the LiveKit server.

Connecting real iOS device to application server running in you local network

One advantage of running OpenVidu locally is that you can test your application client in a real iOS device and be able to reach the application server very easily without worrying about SSL certificates if they are both running in the same local network. For more information, see section Accessing your app from other devices in your network.

Once you have configured the URLs, you can join a video call room by providing a room name and a user name. After joining the room, you will be able to see your own video and audio tracks, as well as the video and audio tracks of the other participants in the room.

For more information, check the iOS tutorial.

Understanding the code#

The application is a simple Ruby app using the popular Sinatra web library. It has a single file app.rb that exports two endpoints:

/token : generate a token for a given Room name and Participant name.
/livekit/webhook : receive LiveKit webhook events.

Let's see the code of the app.rb file:

app.rb
require 'sinatra'
require 'sinatra/cors'
require 'sinatra/json'
require 'livekit' # (1)!
require './env.rb'

SERVER_PORT = ENV['SERVER_PORT'] || 6080 # (2)!
LIVEKIT_API_KEY = ENV['LIVEKIT_API_KEY'] || 'devkey' # (3)!
LIVEKIT_API_SECRET = ENV['LIVEKIT_API_SECRET'] || 'secret' # (4)!

set :port, SERVER_PORT # (5)!

register Sinatra::Cors # (6)!
set :allow_origin, '*' # (7)!
set :allow_methods, 'POST,OPTIONS'
set :allow_headers, 'content-type'
set :bind, '0.0.0.0' # (8)!

Import livekit library
The port where the application will be listening
The API key of LiveKit Server
The API secret of LiveKit Server
Configure the port
Enable CORS support
Set allowed origin (any), methods and headers
Listen in any available network interface of the host

The app.rb file imports the required dependencies and loads the necessary environment variables (defined in env.rb file):

SERVER_PORT: the port where the application will be listening.
LIVEKIT_API_KEY: the API key of LiveKit Server.
LIVEKIT_API_SECRET: the API secret of LiveKit Server.

Finally the application configures the port, sets the CORS configuration for Sinatra and binds the application to all available network interfaces (0.0.0.0).

Create token endpoint#

The endpoint /token accepts POST requests with a payload of type application/json, containing the following fields:

roomName: the name of the Room where the user wants to connect.
participantName: the name of the participant that wants to connect to the Room.

app.rb
post '/token' do
  body = JSON.parse(request.body.read)
  room_name = body['roomName']
  participant_name = body['participantName']

  if room_name.nil? || participant_name.nil?
    status 400
    return json({errorMessage: 'roomName and participantName are required'})
  end

  token = LiveKit::AccessToken.new(api_key: LIVEKIT_API_KEY, api_secret: LIVEKIT_API_SECRET) # (1)!
  token.identity = participant_name # (2)!
  token.add_grant(roomJoin: true, room: room_name) # (3)!

  return json({token: token.to_jwt}) # (4)!
end

A new AccessToken is created providing the LIVEKIT_API_KEY and LIVEKIT_API_SECRET.
We set participant's identity in the AccessToken.
We set the video grants in the AccessToken. roomJoin allows the user to join a room and room determines the specific room. Check out all Video Grants.
Finally, we convert the AccessToken to a JWT token and send it back to the client.

The endpoint first obtains the roomName and participantName parameters from the request body. If they are not available, it returns a 400 error.

If required fields are available, a new JWT token is created. For that we use the LiveKit Ruby SDK:

A new AccessToken is created providing the LIVEKIT_API_KEY and LIVEKIT_API_SECRET.
We set participant's identity in the AccessToken.
We set the video grants in the AccessToken. roomJoin allows the user to join a room and room determines the specific room. Check out all Video Grants.
Finally, we convert the AccessToken to a JWT token and send it back to the client.

Receive webhook#

The endpoint /livekit/webhook accepts POST requests with a payload of type application/webhook+json. This is the endpoint where LiveKit Server will send webhook events.

app.rb
post '/livekit/webhook' do
  auth_header = request.env['HTTP_AUTHORIZATION'] # (1)!
  token_verifier = LiveKit::TokenVerifier.new(api_key: LIVEKIT_API_KEY, api_secret: LIVEKIT_API_SECRET) # (2)!
  begin
    token_verifier.verify(auth_header) # (3)!
    body = JSON.parse(request.body.read) # (4)!
    puts "LiveKit Webhook: #{body}" # (5)!
    return
  rescue => e
    puts "Authorization header is not valid: #{e}"
  end
end

Get the Authorization header from the HTTP request.
Create a new TokenVerifier instance providing the LIVEKIT_API_KEY and LIVEKIT_API_SECRET. This will validate the webhook event to confirm it is actually coming from our LiveKit Server.
Verify the Authorization header with the TokenVerifier.
Now that we are sure the event is valid, we can parse the request JSON body to get the actual webhook event.
Consume the event as you whish.

We need to verify that the event is coming from our LiveKit Server. For that we need the Authorization header from the HTTP request and a TokenVerifier instance built with the LIVEKIT_API_KEY and LIVEKIT_API_SECRET.

If the verification is successful, we can parse the request JSON body and consume the event (in this case, we just log it).

Remember to return a 200 OK response at the end to let LiveKit Server know that the webhook was received correctly.

Configure Webhooks

If you are using a production deployment, remember to configure the webhook URL to point to your local application server as explained in the Send Webhooks to a Local Application Server section.