Support JWT v4

Author: Nyholm

mercure.rst

@@ -408,7 +408,7 @@ And here is the controller::
  // src/Controller/DiscoverController.php
  namespace App\Controller;
 
- use Lcobucci\JWT\Builder;
+ use Lcobucci\JWT\Configuration;
  use Lcobucci\JWT\Signer\Hmac\Sha256;
  use Lcobucci\JWT\Signer\Key;
  use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
@@ -423,10 +423,13 @@ And here is the controller::
  $hubUrl = $this->getParameter('mercure.default_hub');
  $this->addLink($request, new Link('mercure', $hubUrl));
 
- $token = (new Builder())
- // set other appropriate JWT claims, such as an expiration date
+ $key = Key\InMemory::plainText('mercure_secret_key'); // don't forget to set this parameter! Test value: !ChangeMe!
+ $configuration = Configuration::forSymmetricSigner(new Sha256(), $key);
+
+ $token = $configuration->builder()
  ->withClaim('mercure', ['subscribe' => ["http://example.com/books/1"]]) // can also be a URI template, or *
- ->getToken(new Sha256(), new Key($this->getParameter('mercure_secret_key'))); // don't forget to set this parameter! Test value: !ChangeMe!
+ ->getToken($configuration->signer(), $configuration->signingKey())
+ ->toString();
 
  $response = $this->json(['@id' => '/demo/books/1', 'availability' => 'https://schema.org/InStock']);
  $response->headers->set(