boursecu_server/app/Http/Controllers/Super/SuperSettingsController.php

<?php

namespace App\Http\Controllers\Super;

use App\Http\Controllers\Controller;
use App\Http\Middleware\BlockServerAccess;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;

class SuperSettingsController extends Controller
{
    public function show()
    {
        $blocked = (bool) Cache::get(BlockServerAccess::CACHE_KEY, false);

        return response()->json([
            'server_access_blocked' => $blocked,
        ]);
    }

    public function update(Request $request)
    {
        $data = $request->validate([
            'server_access_blocked' => 'sometimes|boolean',
        ]);

        if (array_key_exists('server_access_blocked', $data)) {
            $blocked = (bool) $data['server_access_blocked'];
            if ($blocked) {
                Cache::forever(BlockServerAccess::CACHE_KEY, true);
            } else {
                Cache::forget(BlockServerAccess::CACHE_KEY);
            }
        }

        return response()->json([
            'ok' => true,
            'server_access_blocked' => (bool) Cache::get(BlockServerAccess::CACHE_KEY, false),
        ]);
    }
}