ldc-legaulois/app/Http/Middleware/Authenticate.php

<?php

namespace App\Http\Middleware;

use Illuminate\Auth\Middleware\Authenticate as Middleware;
use Illuminate\Support\Facades\Auth;

class Authenticate extends Middleware
{
    /**
     * Get the path the user should be redirected to when they are not authenticated.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return string|null
     */
    protected function redirectTo($request)
    {
        // Client qui essaye d'accéder au BO
        if ($request->is('bo', 'bo/*')) {
            if (Auth::guard('customer')->check())
                abort(404);
            return route('login');
        }

        // Admin qui va sur la page de connexion client
        if ($request->is('connexion')) {
            if (Auth::check())
                return redirect()->route('home');
        }

        if (! $request->expectsJson()) {
            return route('connexion');
        }
    }
}