Removed application folder (Ci3) added maintenance mode

public/index.php

@@ -22,6 +22,40 @@ if (version_compare(PHP_VERSION, $minPhpVersion, '<')) {
     exit(1);
 }
 
+/*
+ *---------------------------------------------------------------
+ * MAINTENANCE MODE CHECK
+ *---------------------------------------------------------------
+ */
+$maintenanceFile = __DIR__ . '/../writable/down';
+if (file_exists($maintenanceFile)) {
+    $maintenanceData = json_decode(file_get_contents($maintenanceFile), true) ?: [];
+    $allowedIps = $maintenanceData['allowed'] ?? [];
+
+    // Get the visitor's IP address
+    $visitorIp = $_SERVER['HTTP_X_FORWARDED_FOR'] ?? $_SERVER['HTTP_CLIENT_IP'] ?? $_SERVER['REMOTE_ADDR'] ?? '';
+
+    // Handle comma-separated IPs in X-Forwarded-For
+    if (str_contains($visitorIp, ',')) {
+        $visitorIp = trim(explode(',', $visitorIp)[0]);
+    }
+
+    // Check if visitor IP is whitelisted
+    if (! in_array($visitorIp, $allowedIps, true)) {
+        http_response_code(503);
+        header('Retry-After: 3600');
+        header('Content-Type: text/html; charset=UTF-8');
+
+        $maintenancePage = __DIR__ . '/../app/Views/errors/html/maintenance.php';
+        if (file_exists($maintenancePage)) {
+            include $maintenancePage;
+        } else {
+            echo '<h1>Service Unavailable</h1><p>The site is currently under maintenance.</p>';
+        }
+        exit(1);
+    }
+}
+
 /*
  *---------------------------------------------------------------
  * SET THE CURRENT DIRECTORY