Add environment variables to override admin panel interface settings

Co-authored-by: kaaax0815 <32197462+kaaax0815@users.noreply.github.com>

src/server/api/admin/interface/index.get.ts

@@ -1,8 +1,9 @@
 export default definePermissionEventHandler('admin', 'any', async () => {
   const wgInterface = await Database.interfaces.get();
+  const wgInterfaceWithOverrides = applyInterfaceOverrides(wgInterface);
 
   return {
-    ...wgInterface,
+    ...wgInterfaceWithOverrides,
     privateKey: undefined,
   };
 });

src/server/api/admin/interface/index.post.ts

@@ -8,7 +8,20 @@ export default definePermissionEventHandler(
       event,
       validateZod(InterfaceUpdateSchema, event)
     );
-    await Database.interfaces.update(data);
+
+    // Remove overridden fields from the update data
+    const updateData = { ...data };
+    if (WG_OVERRIDE_ENV.INTERFACE_PORT !== undefined) {
+      delete updateData.port;
+    }
+    if (WG_OVERRIDE_ENV.INTERFACE_DEVICE !== undefined) {
+      delete updateData.device;
+    }
+    if (WG_OVERRIDE_ENV.INTERFACE_MTU !== undefined) {
+      delete updateData.mtu;
+    }
+
+    await Database.interfaces.update(updateData);
     await WireGuard.saveConfig();
     return { success: true };
   }