Creating a global user variable - php

Question

I’m new to slim and trying to figure out the best way to create a global user variable. My first thought is to add it to the Container, but I can’t figure out how to inject $app into a route mapped to a class method. I saw somewhere that I can add Container $container to the constructor and the DI should do it automatically? Doesn’t seem to be working.
__construct(Container $container)
Plus, I need to access the variable in a middleware class I wrote to parse my Bearer header, and I can’t find any details on how to do that. I know I can pass $app into each ->add, but that’s a lot of repeated code, and I’m hoping I can avoid that. I'm already injecting an extra variable to parse for roles:
->add(new \App\Middleware\AuthMiddleware('admin'));
public function __construct($role = null)
I can always create a PHP global, but I'd like to figure out what the right Slim way of doing this is.

Answer 1

You can do this with a CurrentUser-class which stores the roles:
class CurrentUser {
private $roles;
function getRoles() {return $this->roles; }
function setRoles($newRoles) {$this->roles = $newRoles; }
}
Which then you can add to the container:
$container[CurrentUser::class] = function($c) {
$user = new CurrentUser();
$user->setRoles(['myrole']);
return $user;
};
And use the CurrentUser-object in a helper method which dynamically creates us the wanted middleware. This method could also be on the CurrentUser-class
function hasPermission($role) {
return function($req, $resp, $next) use ($role) {
if(in_array($role, $this[CurrentUser::class]->getRoles())) {
return $next($res, $resp); // proceed to route
} else {
// handle unauthorized
return $resp->withStatus(401)->write('unauthorized');
}
};
}
Now use the helper method to create the middleware which authorize the user.
$app->get('/books', function ($request, $response, $args) {
return $response->write('Some books yay');
})->add(hasPermission('myrole'));