From 4c366e0110202d8cb6dd544007764a4a49260ccb Mon Sep 17 00:00:00 2001
From: Muffin <muffin@muffin.ink>
Date: Wed, 17 Jul 2024 14:27:33 -0500
Subject: [PATCH] Use a fixed modification date when zipping

---
 src/virtual-machine.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/virtual-machine.js b/src/virtual-machine.js
index 09e9593353d..63872094c2c 100644
--- a/src/virtual-machine.js
+++ b/src/virtual-machine.js
@@ -527,6 +527,15 @@ class VirtualMachine extends EventEmitter {
         zip.file('project.json', projectJson);
         this._addFileDescsToZip(this.serializeAssets(), zip);
 
+        // Use a fixed modification date for the files in the zip instead of letting JSZip use the
+        // current time to avoid a very small metadata leak and make zipping deterministic. The magic
+        // number is from the first TurboWarp/scratch-vm commit after forking
+        // (4a93dab4fa3704ab7a1374b9794026b3330f3433).
+        const date = new Date(1591657163000);
+        for (const file of Object.values(zip.files)) {
+            file.date = date;
+        }
+
         return zip;
     }