From 2adc332586903a84fd2c82fc79b81630488f2096 Mon Sep 17 00:00:00 2001
From: Mark Gilbert <50398495+MarkProminic@users.noreply.github.com>
Date: Tue, 30 Sep 2025 21:37:51 -0500
Subject: [PATCH] Potential fix for code scanning alert no. 25: Server-side URL
 redirect

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
---
 routes/fileServer.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/routes/fileServer.js b/routes/fileServer.js
index 2df8d1d..bb93f4b 100644
--- a/routes/fileServer.js
+++ b/routes/fileServer.js
@@ -238,7 +238,12 @@ router.get('*splat', authenticateDownloads, async (req, res) => {
           return res.status(400).send('Invalid redirect path');
         }
 
-        return res.redirect(301, safeRedirectPath);
+        if (isLocalUrl(safeRedirectPath)) {
+          return res.redirect(301, safeRedirectPath);
+        } else {
+          logger.warn('Blocked attempted open redirect', { path: safeRedirectPath });
+          return res.status(400).send('Invalid redirect path');
+        }
       }
       return handleDirectoryListing(req, res, fullPath, requestPath);
     }