snipe-it/app/Http/Middleware/CheckForSetup.php

<?php

namespace App\Http\Middleware;

use App\Models\Setting;
use Closure;

class CheckForSetup
{
    public function handle($request, Closure $next, $guard = null)
    {

        /**
         * This is dumb
         * @todo Check on removing this, not sure if it's still needed
         */
        if ($request->is('_debugbar*')) {
            return $next($request);
        }

        if (Setting::setupCompleted()) {

            if ($request->is('setup*')) {
                return redirect(url('/'));
            } else {
                return $next($request);
            }

        } else {
            if (!($request->is('setup*')) && !($request->is('.env')) && !($request->is('health'))) {
                return redirect(url('/').'/setup');
            }

            return $next($request);

        }


    }
}