OpenTok Getting Started Sample App

A simple server that uses the OpenTok PHP SDK to create sessions, generate tokens for those sessions, archive (or record) sessions, and download those archives.

Quick deploy to Heroku

Heroku is a PaaS (Platform as a Service) that can be used to deploy simple and small applications for free. To easily deploy this repository to Heroku, sign up for a Heroku account and click this button:

Heroku will prompt you to add your OpenTok API key and OpenTok API secret, which you can obtain at the TokBox Dashboard.

Requirements

• Composer
• Slim

Installation & Running on localhost

1. Clone the app by running the command

    git clone [email protected]:opentok/learning-opentok-php.git
   

2. cd to the root directory.

3. Run composer install --ignore-platform-reqs command to fetch and install all dependencies.

4. Next, input your own API Key and API Secret into the run-demo script file:

   export TOKBOX_API_KEY=0000000
   export TOKBOX_SECRET=abcdef1234567890abcdef01234567890abcdef
   

   Important: The archiving sample application uses archives that are stored in the OpenTok cloud. In your OpenTok Account page, ensure that OpenTok project you use (corresponding to the API key and API secret you use here) is not set up to use cloud storage on Microsoft Azure or Amazon S3. However, in a production application, you will want to use an OpenTok project that has archive file cloud storage on Microsoft Azure or Amazon S3 enabled, since archives stored on the OpenTok cloud are only available for 72 hours.

5. The run-demo file starts the PHP CLI development server (requires PHP >= 5.4) on port 8080. Start the server using the run-demo script:

`$ ./run-demo`

6. Visit the URL http://localhost:8080/session in your browser. You should see a JSON response containing the OpenTok API key, session ID, and token.

Exploring the code

The web/index.php file contains routing for the web service. The rest of this tutorial discusses code in this file.

In order to navigate clients to a designated meeting spot, we associate the Session ID to a room name which is easier for people to recognize and pass. For simplicity, we use a local associated array to implement the association where the room name is the key and the Session ID is the value. For production applications, you may want to configure a persistence (such as a database) to achieve this functionality.

Generate a Session and Token

The GET /room/:name route associates an OpenTok session with a "room" name. This route handles the passed room name and performs a check to determine whether the app should generate a new session ID or retrieve a session ID from the PHP Session. Then, it generates an OpenTok token for that session ID. Once the API key, session ID, and token are ready, it sends a response with the body set to a JSON object containing the information.

// if a room name is already associated with a session ID
if ($app->storage->exists($name)) {

    // fetch the sessionId from local storage
    $app->sessionId = $app->storage[$name];

    // generate token
    $token = $app->opentok->generateToken($app->sessionId);
    $responseData = array(
        'apiKey' => $app->apiKey,
        'sessionId' => $app->sessionId,
        'token'=>$token
    );

    $app->response->headers->set('Content-Type', 'application/json');
    echo json_encode($responseData);
}
else {
    $session = $app->opentok->createSession(array(
        'mediaMode' => MediaMode::ROUTED
    ));

    // store the sessionId into local
    $app->storage[$name] = $session->getSessionId();
    
    // generate token
    $token = $app->opentok->generateToken($session->getSessionId());
    $responseData = array(
        'apiKey' => $app->apiKey,
        'sessionId' => $session->getSessionId(),
        'token'=>$token
    );

    $app->response->headers->set('Content-Type', 'application/json');
    echo json_encode($responseData);
}

The GET /session routes generates a convenient session for fast establishment of communication.

$app->get('/session', 'cors', function () use ($app) { 
    $app->redirect('/room/session');
});

Start an Archive

A POST request to the /archive/start route starts an archive recording of an OpenTok session. The session ID OpenTok session is passed in as JSON data in the body of the request

// Start Archiving and return the Archive
$app->post('/archive/start', 'cors', function () use ($app) {
    $sessionId = $app->request->post('sessionId');
    $archive = $app->opentok->startArchive($sessionId, 'Getting Started Sample Archive');
    $app->response->headers->set('Content-Type', 'application/json');
    echo json_encode($archive->toJson());
});

You can only create an archive for sessions that have at least one client connected. Otherwise, the app will respond with an error.

Stop an Archive

A POST request to the /archive:archiveId/stop route stops an archive recording. The archive ID is returned by call to the archive/start endpoint.

// Stop Archiving and return the Archive
$app->post('/archive/:archiveId/stop', 'cors', function ($archiveId) use ($app) {
    $archive = $app->opentok->stopArchive($archiveId);
    $app->response->headers->set('Content-Type', 'application/json');
    echo json_encode($archive->toJson());
});

View an Archive

A GET request to '/archive/:archiveId/view' redirects the requested clients to a URL where the archive gets played.

// Download the archive
$app->get('/archive/:archiveId/view', 'cors', function ($archiveId) use ($app) {
    $archive = $app->opentok->getArchive($archiveId);
    if ($archive->status=='available') {
        $app->redirect($archive->url);
    }
    else {
        $app->render('view.php');
    }
});

Get Archive information

A GET request to /archive/:archiveId returns a JSON object that contains all archive properties, including status, url, duration, etc. For more information, see here.

$app->get('/archive/:archiveId', 'cors', function ($archiveId) use ($app) {
    $archive = $app->opentok->getArchive($archiveId);
    $app->response->headers->set('Content-Type', 'application/json');
    echo json_encode($archive->toJson());
});

Fetch multiple Archives

A GET request to /archive with optional count and offset params returns a list of JSON archive objects. For more information, please check here.

Examples:

GET /archive // fetch up to 1000 archive objects
GET /archive?count=10  // fetch the first 10 archive objects
GET /archive?offset=10  // fetch archives but first 10 archive objetcs
GET /archive?count=10&offset=10 // fetch 10 archive objects starting from 11st

More information

This sample app does not provide client-side OpenTok functionality (for connecting to OpenTok sessions and for publishing and subscribing to streams). It is intended to be used with the OpenTok tutorials for Web, iOS, iOS-Swift, or Android:

• Web
• iOS
• iOS-Swift
• Android