Symfony Mercure Component

To publish real-time updates, you need to configure a Hub instance. This requires the Hub's URL and a TokenProvider that generates valid JWTs for authentication.

1. Define your HUB_URL and JWT_SECRET.
2. Create a LcobucciFactory using your secret.
3. Create a FactoryTokenProvider (passing the factory and the topics you wish to publish to, e.g., ['*'] for all topics).
4. Instantiate the Hub with the URL and provider.
5. Use $hub->publish() with a new Update object containing the target topic (URL) and the payload.

// change these values accordingly to your hub installation
const HUB_URL = 'https://demo.mercure.rocks/.well-known/mercure';
const JWT_SECRET = '!ChangeThisMercureHubJWTSecretKey!';

// Set up the JWT token provider
// Alternatively, you can use the \Symfony\Component\Mercure\Jwt\StaticTokenProvider if you already have a JWT token
$jwFactory = new \Symfony\Component\Mercure\Jwt\LcobucciFactory(JWT_SECRET);
$provider = new \Symfony\Component\Mercure\Jwt\FactoryTokenProvider($jwFactory, publish: ['*']);

$hub = new \Symfony\Component\Mercure\Hub(HUB_URL, $provider);

// Serialize the update, and dispatch it to the hub, that will broadcast it to the clients
$id = $hub->publish(new \Symfony\Component\Mercure\Update('https://example.com/books/1.jsonld', 'Hi from Symfony!'));