ldc-tousenselle/app/Providers/AuthServiceProvider.php

<?php

namespace App\Providers;

use App\Mail\UserEmailReset;
use App\Mail\UserEmailVerify;
use App\Models\Participation;
use App\Models\User;
use Illuminate\Auth\Notifications\VerifyEmail;
use Illuminate\Auth\Notifications\ResetPassword;
use Illuminate\Foundation\Support\Providers\AuthServiceProvider as ServiceProvider;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Gate;

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

        VerifyEmail::toMailUsing(function ($notifiable, $url) {
            return new UserEmailVerify($notifiable, $url);
        });
        ResetPassword::toMailUsing(function ($notifiable, $url) {
            return new UserEmailReset($notifiable, $url);
        });

        Gate::define('participate', function (User $user) {
            return
                !is_null(app('clientIp'))
                and !$user->participations()
                    ->whereDate('updated_at', Carbon::now()->toDateString())
                    ->count()
            and Participation::where('ip', app('clientIp'))
                ->whereDate('updated_at', '=', Carbon::now()->toDateString())
                ->count() <= 3;
        });
    }
}