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Java#

Source code

This is a minimal server application built for Java with Spring Boot that allows:

It internally uses LiveKit Kotlin SDK.

Running this tutorial#

1. Run OpenVidu Server#

  1. Download OpenVidu

    git clone https://github.com/OpenVidu/openvidu-local-deployment -b 3.0.0-beta3

  2. Configure the local deployment

    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

  3. Run OpenVidu

    docker compose up

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

Configure Webhooks

All application servers have an endpoint to receive webhooks from OpenVidu. 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.

2. Download the tutorial code#

git clone https://github.com/OpenVidu/openvidu-livekit-tutorials.git -b 3.0.0-beta3

3. Run the server application#

To run this server application, you need Java and Maven installed on your device.

  1. Navigate into the server directory 
    cd openvidu-livekit-tutorials/application-server/java
  2. Run the application 
    mvn spring-boot:run

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

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

  1. Navigate into the application client directory:

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

  2. 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 local deployment from other devices on your network.

For more information, check the JavaScript tutorial.

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

  1. Navigate into the application client directory:

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

  2. Install dependencies:

    npm install

  3. 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 local deployment from other devices on your network.

For more information, check the React tutorial.

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

  1. Navigate into the application client directory:

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

  2. Install the required dependencies:

    npm install

  3. 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 local deployment from other devices on your network.

For more information, check the Angular tutorial.

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

  1. Navigate into the application client directory:

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

  2. Install dependencies:

    npm install

  3. 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 local deployment from other devices on your network.

For more information, check the Vue tutorial.

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

  1. Navigate into the application client directory:

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

  2. Install the required dependencies:

    npm install

  3. 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 local deployment from other devices on your network.

For more information, check the Electron tutorial.

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

  1. Navigate into the application client directory:

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

  2. Install the required dependencies:

    npm install

  3. Serve the application:

    You have two options for running the client application: browser-based or mobile device-based:

    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 local deployment from other devices on 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 local deployment from other devices on 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.

    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.

  1. Open Android Studio and import the project located at openvidu-livekit-tutorials/application-client/openvidu-android.

  2. 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 local deployment from other devices on 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.

  1. Launch Xcode and open the OpenViduIOS.xcodeproj that you can find under openvidu-livekit-tutorials/application-client/openvidu-ios.

  2. 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 local deployment from other devices on 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 Spring Boot app with a single controller Controller.java 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 Controller.java file:

Controller.java
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@CrossOrigin(origins = "*") // (1)!
@RestController // (2)!
public class Controller {

    @Value("${livekit.api.key}")
    private String LIVEKIT_API_KEY; // (3)!

    @Value("${livekit.api.secret}")
    private String LIVEKIT_API_SECRET; // (4)!

    ...
}
  1. Allows the application to be accessed from any domain
  2. Marks the class as a controller where every method returns a domain object instead of a view
  3. The API key of LiveKit Server
  4. The API secret of LiveKit Server

Starting by the top, the Controller class has the following annotations:

  • @CrossOrigin(origins = "*"): allows the application to be accessed from any domain.
  • @RestController: marks the class as a controller where every method returns a domain object instead of a view.

Going deeper, the Controller class has the following fields:

  • LIVEKIT_API_KEY: the API key of LiveKit Server. It is injected from the property livekit.api.key defined in application.properties using the @Value("${livekit.api.key}") annotation.
  • LIVEKIT_API_SECRET: the API secret of LiveKit Server. It is injected from the the property livekit.api.secret defined in application.properties using the @Value("${livekit.api.secret}") annotation.

Create token#

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.
Controller.java
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@PostMapping(value = "/token")
public ResponseEntity<Map<String, String>> createToken(@RequestBody Map<String, String> params) {
    String roomName = params.get("roomName");
    String participantName = params.get("participantName");

    if (roomName == null || participantName == null) {
        return ResponseEntity.badRequest().body(Map.of("errorMessage", "roomName and participantName are required"));
    }

    AccessToken token = new AccessToken(LIVEKIT_API_KEY, LIVEKIT_API_SECRET); // (1)!
    token.setName(participantName); // (2)!
    token.setIdentity(participantName);
    token.addGrants(new RoomJoin(true), new RoomName(roomName)); // (3)!

    return ResponseEntity.ok(Map.of("token", token.toJwt())); // (4)!
}
  1. A new AccessToken is created providing the LIVEKIT_API_KEY and LIVEKIT_API_SECRET.
  2. We set participant's name and identity in the AccessToken.
  3. We set the video grants in the AccessToken. RoomJoin allows the user to join a room and RoomName determines the specific room. Check out all Video Grants.
  4. Finally, the token is sent 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 Kotlin SDK:

  1. A new AccessToken is created providing the LIVEKIT_API_KEY and LIVEKIT_API_SECRET.
  2. We set participant's name and identity in the AccessToken.
  3. We set the video grants in the AccessToken. RoomJoin allows the user to join a room and RoomName determines the specific room. Check out all Video Grants.
  4. Finally, the token is sent 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.

Controller.java
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@PostMapping(value = "/livekit/webhook", consumes = "application/webhook+json")
public ResponseEntity<String> receiveWebhook(@RequestHeader("Authorization") String authHeader, @RequestBody String body) { // (1)!
    WebhookReceiver webhookReceiver = new WebhookReceiver(LIVEKIT_API_KEY, LIVEKIT_API_SECRET); // (2)!
    try {
        WebhookEvent event = webhookReceiver.receive(body, authHeader); // (3)!
        System.out.println("LiveKit Webhook: " + event.toString()); // (4)!
    } catch (Exception e) {
        System.err.println("Error validating webhook event: " + e.getMessage());
    }
    return ResponseEntity.ok("ok");
}
  1. We need the 'Authorization' header and the raw body of the HTTP request.
  2. Initialize the WebhookReceiver using the LIVEKIT_API_KEY and LIVEKIT_API_SECRET. It will help validating and decoding incoming webhook events.
  3. Obtain the WebhookEvent object using the WebhookReceiver#receive method. It takes the raw body as a String and the Authorization header of the request.
  4. Consume the event as you whish.

We declare the 'Authorization' header and the raw body of the HTTP request as parameters of the our method. We need both of them to validate and decode the incoming webhook event.

Then we initialize a WebhookReceiver object using the LIVEKIT_API_KEY and LIVEKIT_API_SECRET.

Finally we obtain a WebhookEvent object calling method WebhookReceiver#receive. It takes the raw body as a String and the Authorization header of the request. If everything is correct, you can do whatever you want with 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.