Passing objects to a laravel middleware

Question

According to the documentation, a middleware may be parametrised with static values in the routes file:

Route::put('post/{id}', ['middleware' => 'role:editor', function ($id) {
    //
}]);

What if I need to pass in a service?

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My motivation for doing this is avoiding Facades because even though they are supposed to be mockable, I am running into problems already at the first try. Mockery/mockery does some crazy eval stuff and I am not wiling to debug that. In essence some class is declared twice and PHP chokes with a fatal error. It happens probably because I am following the example incorrectly, but let us leave it at that. I do not want to rely on Facades.

I do not want to learn about why Facades are awesome, because dependency declaration in constructors is enough to make me happy.

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I tried following the route action, but I cant not understand what happens in Route::parseAction($action). Where are the middlewares instantiated? Is there a standard way to pass objects to middewares?

Answer 1

If you want a service passed to the middleware you need to declare it as a dependency of middleware's constructor. As an example look at the RedirectIfAuthenticated middleware that exists by default in Laravel app - it gets fetched the Guard object, which is the one you can also access via Auth facade.

class RedirectIfAuthenticated
{
  /**
   * The Guard implementation.
   *
   * @var Guard
   */
  protected $auth;

  /**
   * Create a new filter instance.
   *
   * @param  Guard $auth
   *
   * @return void
   */
  public function __construct(Guard $auth)
  {
    $this->auth = $auth;
  }

  //rest of the code