fix: support proxied origins and update progress

server/update.ts

@@ -423,7 +423,7 @@ export async function verifySha256(filePath: string, expected: string): Promise<
 export async function downloadReleaseAsset(
   url: string | URL,
   destination: string,
-  options: UrlPolicy & { fetchImpl?: typeof fetch | undefined; maxBytes?: number | undefined } = {},
+  options: UrlPolicy & { fetchImpl?: typeof fetch | undefined; maxBytes?: number | undefined; onProgress?: ((downloadedBytes: number, totalBytes: number | null) => void) | undefined } = {},
 ): Promise<{ size: number; sha256: string }> {
   const fetchImpl = options.fetchImpl ?? fetch;
   let current = validateHttpsUrl(url, options);
@@ -446,6 +446,7 @@ export async function downloadReleaseAsset(
   }
   if (response.status < 200 || response.status >= 300 || !response.body) throw new Error("更新文件下载失败");
   const declared = Number(response.headers.get("content-length") ?? 0);
+  const totalBytes = Number.isSafeInteger(declared) && declared > 0 ? declared : null;
   const maxBytes = options.maxBytes ?? 512 * 1024 * 1024;
   if (declared > maxBytes) throw new Error("更新文件超过大小限制");
   await mkdir(path.dirname(destination), { recursive: true, mode: 0o700 });
@@ -454,6 +455,7 @@ export async function downloadReleaseAsset(
   const hash = createHash("sha256");
   const meter = new Transform({ transform(chunk: Buffer, _encoding, callback) {
     size += chunk.length;
+    options.onProgress?.(size, totalBytes);
     if (size > maxBytes) return callback(new Error("更新文件超过大小限制"));
     hash.update(chunk);
     callback(null, chunk);