How to validate params in REST Lumen/Laravel request?

Question

Route: $app->get('/ip/{ip}', GeoIpController::class . '@show');

How to validate ip's properly? I've tried to inject Request object in show method, but wasn't able to solve this. I want to stick with REST, so using URL parameters is not solution for me. I use it for API purposes, so status code as response would be appropriate.

Also tried that way:

$app->bind('ip', function ($ip) {
    $this->validate($ip, [
        'ip' => 'required|ip',
    ]);
});

EDIT: The answer below is correct, I've found more info about requests in documentation:

Form requests are not supported by Lumen. If you would like to use form requests, you should use the full Laravel framework.

In other words, you cannot use custom requests via injection in constructors in Lumen.

Solution

The validate method takes the request object as the first parameter. Since you're passing the ip in the route, you need to create a custom validator.

public function show($ip)
{
    $data = ['ip' => $ip];

    $validator = \Validator::make($data, [
        'ip' => 'required|ip'
    ]);

    if ($validator->fails()) {
        return $validator->errors();
    }

    return response()->json(['All good!']);
}

Edit : This is all laravel does under the hood. You could basically you this function directly to validate the ip and save a lot of effort.

protected function validateIp($ip)
{
    return filter_var($ip, FILTER_VALIDATE_IP) !== false;
}