I don't know how works the Key

[R3B4T0]

Error: "Cannot instantiate interface Lcobucci\JWT\Signer\Key"

Program:

use Lcobucci\JWT\Signer\Key;

public function chat()
{
$username = $this->getUser()->getUsername();
$token = (new Builder())
->withClaim('mercure', ['subscribe' => [sprintf("/%s", $username)]])
->getToken(
new Sha256(),
new Key($this->getParameter('mercure_secret_key'))
)
;

    $response = $this->render('conversacion/index.html.twig', [
        'controller_name' => 'UsuarioController'
    ]);

    $response->headers->setCookie(
        new Cookie(
            'mercureAuthorization',
            $token,
            (new \DateTime())
            ->add(new \DateInterval('PT2H')),
            '/.well-known/mercure',
            null,
            false,
            true,
            false,
            'strict'
        )
    );

    return $response;
}

[Ocramius]

That's because Key is an interface:

jwt/src/Signer/Key.php

Line 6 in 207955d

interface Key

Are you reading the docs for the correct version of the library?

[R3B4T0]

When I implement Key, I get this error:

Error: Class App\Controller\UsuarioController contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods (Lcobucci\JWT\Signer\Key::contents, Lcobucci\JWT\Signer\Key::passphrase)

[lcobucci]

We already provide some implementations for the Key, so you don't need to do that. Check https://lcobucci-jwt.readthedocs.io/en/latest/configuration/#configuration-initialisation for some ideas on how to instantiate them.

[Ocramius]

Hey @R3B4T0, there are already pre-existing implementations of Key in this library: https://github.com/lcobucci/jwt/tree/207955dfbce28b4fbdc12367fbccf9546c66eb2d/src/Signer/Key

As a general rule of thumb, if you do not understand how to implement the Key interface, you probably shouldn't do it on your own.

Please check https://github.com/lcobucci/jwt/blob/207955dfbce28b4fbdc12367fbccf9546c66eb2d/docs/configuration.md