Slim 4 - Custom Request (extending the existing Request)

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Edit: I think i found a post that sort of explains how to do it but i could use some help there trying to figure out my usecase: Type hinting $request->getAttribute("woof") / data from middleware - #10 by reuben.helms

This is an old topic, but I am also trying to implement a custom request. I want autocomplete in my IDE for the data that is being sent with the specific request. So I wlll have a LoginUserRequest, SaveInvoiceRequest, etc.

All examples simplified ofcourse.

I want my controller to look something like this:

public function __invoke(
    LoginUserRequest $request, // instead of ServerRequestInterface
    ResponseInterface $response
): ResponseInterface {

    $user = ($this->LoginUserAction)($request);

    return $response->withJson([
            'success' => true,
            'data' => [
                'token' => $token,
            ],
        ]);
}

and my LoginUserAction something like this:

    public function __invoke(LoginUserRequest $data): User
    {
        return $this->userModel->findByEmail($loginData->email);
    }

But how do i go about creating that custom request class? Is there any way in Slim? I tried finding a solution but havent found any yet.

And the custom LoginUserRequest something like this but i have no idea what to extend, implement or use to get there:

class LoginUserRequest
{
    public function __construct(
        public string $email,
        public string $password,
    ) {}

    public function __invoke($request) {
        $parsedBody = $request->getParsedBody();

        $this->email = $parsedBody['email'];

        $this->password = $parsedBody['password'];

        return $this;
    }
}