it works

server/routes/convert.post.ts

@@ -1,15 +1,38 @@
 
 export default defineEventHandler(async (event) => {
     // this one requires auth
-    //const login = fetch("http://127.0.0.1:81/login");
-    console.log(await readBody(event))
 
+    const config = await useRuntimeConfig(event)
+    const body = await readBody(event)
     const session = await getUserSession(event)
-    console.log(session)
-    try {
-        const userId = session.secure!.user_id;
-    }
-    catch {
+    //console.log(session)
+    
+    const userId = session.secure?.user_id;
+    if (userId == undefined || userId == null)
         throw createError({ status: 401 })
-    }
+    else if (body.song == undefined) 
+        throw createError({ status: 400, message: "Song name required"})
+
+    const req = await fetch(config.fastapi_url + "/convert", {
+        method: "POST",
+        headers: {
+            "Content-Type": "application/json"
+        },
+        body: JSON.stringify({
+            video_url : body.url,
+            user_id : userId,
+            artist : body.artist || null,
+            album : body.album || null,
+            song : body.song
+        })
+    })
+    setResponseStatus(event, req.status)
+    setResponseHeader(event, "Content-Type", "application/json")
+
+    //console.log(await req.json())
+    return await req.json()
+
+    
+
+
 })

server/routes/download/[file].get.ts

@@ -0,0 +1,32 @@
+import { createReadStream, existsSync, unlink, unlinkSync } from "node:fs"
+import { } from "fs/promises"
+import { join } from "path"
+
+export default defineEventHandler(async (event) => {
+    const session = await getUserSession(event)
+    //const query = await getQuery(event)
+
+    // @ts-ignore
+    const userId = session.secure?.user_id;
+    if (userId == undefined || userId == null)
+        throw createError({ status: 401 })
+
+    const file = await getRouterParam(event, 'file');
+    if (file == undefined)
+        throw createError({ status: 400, message: "No file"})
+    
+    const def_filepath = "/home/suricatingss/Projects/WebStorm/yt2mp3/server/fastapi_server/downloads";
+    const filepath = join(def_filepath, userId.toString(), file.toString())
+    console.log(filepath)
+
+    if (!existsSync(filepath)) 
+        throw createError({ status: 404, message: "Not found"})
+    
+    setHeader(event, 'Content-Disposition', `attachment; filename="${file}"`)
+
+    const file_stream = createReadStream(filepath)
+
+    file_stream.on("close", () =>  unlink(filepath, (err) => { if (err) console.warn(err.message) }))
+
+    return file_stream;
+})