fix linux issue

Overlord-Server/src/server/file-transfer-state.test.ts

@@ -0,0 +1,14 @@
+import { describe, expect, test } from "bun:test";
+import { remotePathBasename } from "./file-transfer-state";
+
+describe("remotePathBasename", () => {
+  test("extracts names from Windows paths on any server platform", () => {
+    expect(remotePathBasename("C:\\Temp\\overlord-e2e-download.bin"))
+      .toBe("overlord-e2e-download.bin");
+  });
+
+  test("extracts names from POSIX and mixed-separator paths", () => {
+    expect(remotePathBasename("/tmp/archive.tar.gz")).toBe("archive.tar.gz");
+    expect(remotePathBasename("C:\\Temp/mixed.bin")).toBe("mixed.bin");
+  });
+});

Overlord-Server/src/server/file-transfer-state.ts

@@ -91,6 +91,11 @@ export function isSafeRemotePath(value: string): boolean {
   return true;
 }
 
+export function remotePathBasename(value: string): string {
+  const segments = value.split(/[\\/]+/).filter(Boolean);
+  return segments.at(-1) || "";
+}
+
 export function notifyPullWaiters(state: StreamingPullState) {
   const list = state.waiters.splice(0);
   for (const w of list) {

Overlord-Server/src/server/routes/file-download-routes.ts

@@ -13,6 +13,7 @@ import {
   UUID_TOKEN_RE,
   getFileTransferLimits,
   isSafeRemotePath,
+  remotePathBasename,
   makeIncrementalPullStream,
   notifyPullWaiters,
   streamFileRangeWithCleanup,
@@ -125,7 +126,7 @@ async function serveDownloadById(
 
   const commandId = uuidv4();
 
-  let fileName = path.basename(downloadPath) || "download.bin";
+  let fileName = remotePathBasename(downloadPath) || "download.bin";
   try {
     fileName = deps.sanitizeOutputName(fileName);
   } catch {
@@ -604,7 +605,7 @@ export async function handleFileDownloadRoutes(
       ip: server.requestIP(req)?.address || "unknown",
     });
 
-    const fileName = deps.sanitizeOutputName(path.basename(pull.fileName) || "upload.bin");
+    const fileName = deps.sanitizeOutputName(remotePathBasename(pull.fileName) || "upload.bin");
     const baseHeaders = {
       ...deps.secureHeaders("application/octet-stream"),
       "Content-Disposition": `attachment; filename="${fileName}"`,