From c15a10c0983879731fc692638325f0c7fcf9d33b Mon Sep 17 00:00:00 2001
From: chengww <chengww5217@163.com>
Date: Sun, 17 May 2026 20:16:25 +0800
Subject: [PATCH] =?UTF-8?q?fix(local-music):=20=E4=B8=BB=E8=BF=9B=E7=A8=8B?=
 =?UTF-8?q?=E5=AE=9E=E7=8E=B0=20Range/206=20=E8=AE=A9=E6=9C=AC=E5=9C=B0?=
 =?UTF-8?q?=E9=9F=B3=E4=B9=90=20seek/=E5=BF=AB=E8=BF=9B=E6=81=A2=E5=A4=8D?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

切到 protocol.handle 后，audio 元素发的 Range 请求会带 HTTP 头到达
主进程；net.fetch(file://) 既不识别 Range 也不带 Accept-Ranges，导致
浏览器认为 local:// 不支持随机访问，seek 时只能从头加载，表现为
快进失效、退出后恢复播放从 0 开始。

新增 buildLocalFileResponse：
- 无 Range：200 + Accept-Ranges: bytes，让 audio 知道支持随机访问
- 有 Range：206 + Content-Range，用 fs.createReadStream 切片返回
- 非法 Range：416 + Content-Range: bytes */total

顺手把 fs.existsSync 换成 stat，一次拿文件大小且过滤掉目录。
---
 src/main/modules/fileManager.ts | 49 +++++++++++++++++++++++++++++----
 1 file changed, 44 insertions(+), 5 deletions(-)

diff --git a/src/main/modules/fileManager.ts b/src/main/modules/fileManager.ts
index 45ae3ef..b3da081 100644
--- a/src/main/modules/fileManager.ts
+++ b/src/main/modules/fileManager.ts
@@ -1,8 +1,8 @@
-import { app, dialog, ipcMain, net, protocol, shell } from 'electron';
+import { app, dialog, ipcMain, protocol, shell } from 'electron';
 import Store from 'electron-store';
 import * as fs from 'fs';
 import * as path from 'path';
-import { pathToFileURL } from 'url';
+import { Readable } from 'stream';
 
 import { getStore } from './config';
 
@@ -24,6 +24,45 @@ function sanitizeFilename(filename: string): string {
     .trim();
 }
 
+// Electron net.fetch(file://) 在当前版本不会回 206，audio seek 需要主进程自己处理 Range
+function buildLocalFileResponse(
+  filePath: string,
+  total: number,
+  rangeHeader: string | null
+): Response {
+  const range416 = () =>
+    new Response(null, { status: 416, headers: { 'Content-Range': `bytes */${total}` } });
+
+  let start = 0;
+  let end = total - 1;
+  let partial = false;
+
+  if (rangeHeader) {
+    const m = /^bytes=(\d*)-(\d*)$/.exec(rangeHeader.trim());
+    if (!m || (!m[1] && !m[2])) return range416();
+    if (m[1]) {
+      start = parseInt(m[1], 10);
+      if (m[2]) end = Math.min(parseInt(m[2], 10), end);
+    } else {
+      start = Math.max(0, total - parseInt(m[2], 10));
+    }
+    if (start > end || start >= total) return range416();
+    partial = true;
+  }
+
+  return new Response(
+    Readable.toWeb(fs.createReadStream(filePath, { start, end })) as ReadableStream,
+    {
+      status: partial ? 206 : 200,
+      headers: {
+        'Content-Length': String(end - start + 1),
+        'Accept-Ranges': 'bytes',
+        ...(partial && { 'Content-Range': `bytes ${start}-${end}/${total}` })
+      }
+    }
+  );
+}
+
 /**
  * 初始化文件管理相关的IPC监听
  */
@@ -48,13 +87,13 @@ export function initializeFileManager() {
 
       filePath = path.normalize(filePath);
 
-      if (!fs.existsSync(filePath)) {
+      const stat = await fs.promises.stat(filePath).catch(() => null);
+      if (!stat?.isFile()) {
         console.error('File not found:', filePath);
         return new Response(null, { status: 404 });
       }
 
-      // 用 net.fetch 走 file:// 加载，自动支持 Range / streaming，让媒体元素能正常 seek
-      return net.fetch(pathToFileURL(filePath).toString());
+      return buildLocalFileResponse(filePath, stat.size, request.headers.get('range'));
     } catch (error) {
       console.error('Error handling local protocol:', error);
       return new Response(null, { status: 500 });