Require auth for direct /files/ downloads

services/nginx/app/file_server.php

@@ -5,6 +5,21 @@ $isPreview = $_GET['preview'] ?? false;
 // Remove query string if present
 $file = strtok($file, '?');
 
+// Require authentication for direct /files/ access
+if (str_contains($file, '/files/')) {
+    $headers = getallheaders();
+    $token = $_GET['token'] ?? $_POST['token'] ?? ($headers['Authorization'] ?? null);
+    if (!empty($token)) {
+        $token = str_replace('Bearer ', '', $token);
+    }
+
+    if (empty($token) || !(new \classes\authentication())->validate_token($token)) {
+        header('HTTP/1.1 401 Unauthorized');
+        echo 'Unauthorized';
+        exit;
+    }
+}
+
 $isPDF = false;
 $isPDFStore = false;
 $isAttachment = false;
@@ -118,4 +133,4 @@ if (!$isPDF) {
     // Delete the file from /tmp after sending it
     unlink($file_path);
     exit;
-}
+}