first commit

apps/server/src/torrent/torrent.generator.ts

@@ -0,0 +1,41 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+import { config } from "../config";
+import { logger } from "../utils/logger";
+
+export const generateTorrentFile = async (
+  magnet: string,
+  hash: string
+): Promise<string> => {
+  const targetPath = path.join(config.torrentArchiveDir, `${hash}.torrent`);
+  const { default: WebTorrent } = await import("webtorrent");
+  const client = new WebTorrent();
+
+  return new Promise((resolve, reject) => {
+    const torrent = client.add(magnet, { path: config.dataDir });
+    const timeout = setTimeout(() => {
+      client.destroy();
+      reject(new Error("Metadata fetch timeout"));
+    }, 120_000);
+
+    torrent.on("metadata", async () => {
+      clearTimeout(timeout);
+      try {
+        const buffer = torrent.torrentFile;
+        await fs.writeFile(targetPath, buffer);
+        resolve(targetPath);
+      } catch (error) {
+        reject(error);
+      } finally {
+        client.destroy();
+      }
+    });
+
+    torrent.on("error", (error) => {
+      logger.error({ error }, "Torrent metadata error");
+      clearTimeout(timeout);
+      client.destroy();
+      reject(error);
+    });
+  });
+};