How to fire an event after successful authentication with JWT - php

Question

I have a Laravel version 6 application. I use JWT package for authentication.
The routes defined like this:
// route/api.php
Route::middleware('auth:api')->group(function () {
Route::apiResources([
'genders' => 'API\GenderController'
]);
});
Inside the controllers I have 5 functions index, store, show, update and destroy.
I need to set the locale for the current user before running any code inside these functions, something like this:
public function index()
{
$locale = request()->user()->lang;
app()->setLocale($locale);
// Rest of the function
}
My controller class extends a BaseController class. As the Restful API is state less I need to set the locale each time the user send a API request. Now the question is that where is the best place to do it and how can I do it?
I tried to do it inside the constructor of the BaseController but it seems the middleware('auth:api') has not yet checked the token in constructor.
The other option is to set the locale inside a authentication event handler. I found a list of JWT package events here:
// fired when the token could not be found in the request
Event::listen('tymon.jwt.absent');
// fired when the token has expired
Event::listen('tymon.jwt.expired');
// fired when the token is found to be invalid
Event::listen('tymon.jwt.invalid');
// fired if the user could not be found (shouldn't really happen)
Event::listen('tymon.jwt.user_not_found');
// fired when the token is valid (User is passed along with event)
Event::listen('tymon.jwt.valid');
If someone could help me to define a handler for tymon.jwt.valid I would be appreciated. Or even if you have some other solution for running an event before execution of index, store, show, update and destroy functions.

Answer 1

You can easily do it in the middleware. Just put middleware that authenticates user before the one that sets location.
Create your route class and register it in App\Http\Kernel::$routeMiddleware
Then use it like this:
// rouite/api.php
Route::group(['middleware' => ['auth:api', 'locale']], function () {
Route::apiResources([
'genders' => 'API\GenderController'
]);
});

Answer 2

I could find a different way for accessing the current user inside the constructor class. While the request()->user() code returns null in constructor, auth()->user() return the current user even in the constructor.
abstract class BaseController extends Controller
{
public function __construct()
{
$locale = auth()->user()->lang;
app()->setLocale($locale);
}
}
Therefore I could set the locale in my BaseController class.
However, my question regarding working with JWT events is open. Also I would like to know more details about working with middleware as #patryk-karczmarczyk suggested in his answer.