AuthServiceProvider

ConteudoController

  public function index()
    {
    
    

        if (Gate::forUser(Auth::guard('admin_user')->user())->denies('listar-conteudos')) {
            abort(403,'Não pode listar conteudos');
        }
        
        $conteudos = $this->conteudos->orderBy('id', 'desc')->paginate(10);

ConteudoPolicy

<?php

namespace Unita\Policies;

use Auth;
use Illuminate\Auth\Access\HandlesAuthorization;
use Unita\AdminUser;
use Unita\Conteudo;

class ConteudoPolicy
{
    use HandlesAuthorization;

    public function before($user, $ability)
    {
        if ($user->isSuperAdmin()) {
            return true;
        }
    }

    public function listarConteudos($user) {
        return $user === 1;
    }

}

gistfile1.txt

<?php

namespace Unita\Providers;

use Illuminate\Foundation\Support\Providers\AuthServiceProvider as ServiceProvider;
use Illuminate\Support\Facades\Gate;
use Unita\Conteudo;
use Unita\Policies\ConteudoPolicy;

class AuthServiceProvider extends ServiceProvider
{
    /**
     * The policy mappings for the application.
     *
     * @var array
     */
    protected $policies = [
        'Unita\Model' => 'Unita\Policies\ModelPolicy',
        'Unita\Conteudo' => 'Unita\Policies\ConteudoPolicy',
    ];

    /**
     * Register any authentication / authorization services.
     *
     * @return void
     */
    public function boot()
    {
        $this->registerPolicies();

            Gate::define('listar-conteudos', 'ConteudoPolicy@listarConteudos');

        //
    }
}