mesreleves-php/app/Http/Middleware/CheckInstallation.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Symfony\Component\HttpFoundation\Response;

class CheckInstallation
{
    public function handle(Request $request, Closure $next): Response
    {
        $installed = file_exists(storage_path('installed'));
        $onSetup   = $request->is('setup') || $request->is('setup/*');

        if (! $installed && ! $onSetup) {
            // Laisser passer les health checks et réponses JSON
            if ($request->is('up') || $request->expectsJson()) {
                return $next($request);
            }
            return redirect('/setup');
        }

        if ($installed && $onSetup) {
            return redirect('/');
        }

        return $next($request);
    }
}