websӘFacebook ite

src/web/endpoints/back/dlWebplayback.ts

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+import { getWidevineDecryptionKey } from "../../../downloader/keygen.js";
+import { downloadSong, WebplaybackCodec } from "../../../downloader/index.js";
+import express from "express";
+import StreamInfo from "../../../downloader/streamInfo.js";
+import { appleMusicApi } from "../../../api/index.js";
+
+const router = express.Router();
+
+router.get("/dlWebplayback", async (req, res, next) => {
+    try {
+        const { trackId, codec } = req.query;
+        if (typeof trackId !== "string") { res.status(400).send("trackId is required and must be a string!"); return; }
+        if (typeof codec !== "string") { res.status(400).send("codec is required and must be a string!"); return; }
+
+        const c = Object.values(WebplaybackCodec).find((c) => { return c === codec; });
+        if (c === undefined) { res.status(400).send("codec is invalid!"); return; }
+
+        // TODO: check if this returns an error
+        const webplaybackResponse = await appleMusicApi.getWebplayback(trackId);
+        console.log(webplaybackResponse);
+        const streamInfo = await StreamInfo.fromWebplayback(webplaybackResponse, c);
+        if (streamInfo.widevinePssh !== undefined) {
+            const decryptionKey = await getWidevineDecryptionKey(streamInfo.widevinePssh, streamInfo.trackId);
+            const filePath = await downloadSong(streamInfo.streamUrl, decryptionKey, c);
+            res.download(filePath);
+        } else {
+            res.status(400).send("no decryption key found!");
+        }
+    } catch (err) {
+        next(err);
+    }
+});
+
+export default router;