问Symfony -如何调用链中的下一个服务

EN

interface AuthorizationRequestHandlerInterface
{
    public function auth(Request $request): bool;

   // Option 2
   public function setNext(AuthorizationRequestHandlerInterface $handler): void;
}

class Authorization1 implements AuthorizationRequestHandlerInterface
{
    // Option 1
    public function __construct(private AuthorizationRequestHandlerInterface $handler)
    {
    }

    // Option 2
    public function setNext(AuthorizationRequestHandlerInterface $handler): void
    {
        $this->handler = $handler;
    } 

    public function auth(Request $request): bool
    {
        if (isThisRoute) {
            // Check permissions here or call your private or protected method
            return $this->authorize($request);
        }

        // Option 1: Call the next handler
        return $this->handler->auth($request);  

        // Option 2: Call the next handler if it exists
        return $this->handler ? $this->handler->auth($request) : false;
    }

    private function authorize(Request $request): bool
    {
        $result = false;

        // Your code

        return $result;
    }
}

// Initialization: Option 1
$authNull = new AuthNull();
$auth1 = new Authorization1($authNull);
$auth2 = new Authorization2($auth1);
$auth3 = new Authorization3($auth2);

return $auth3;

// Initialization: Option 2
$auth1 = new Authorization1($authNull);
$auth2 = new Authorization2($auth1);
$auth3 = new Authorization3($auth2);
$auth1->setNext($auth2);
$auth2->setNext($auth3);
// In this way you must add the `setNext` method and use its value as `handler` instead of that constructor value.

return $auth1;

// ...

// A class that has the main handler, like AbstractGuardAuthenticator, Controller, ArgumentResolver, ParamConverter, Middleware, etc.

if ($auth->handle($request)) {
    // when it is authorizable, continues the request
} else {
    // when it isn't authorizable, throws Exception, for example
}

// Different handling order that depends on the options.
// Option 1: Auth3 -> Auth2 -> Auth1 -> AuthNull
// Option 2: Auth1 -> Auth2 -> Auth3