instrunet_backend/main.js

var express = require('express');
var app = express();
var fs = require("fs");
const sqlite3 = require('sqlite3').verbose();
const db = new sqlite3.Database('./database.db');
const jwt = require("jsonwebtoken");
const bodyParser = require("body-parser");
const {spawn} = require("child_process");
const nrc = require('node-run-cmd')
const https = require("node:https");
const {encode} = require("html-entities");
const querystring = require("node:querystring");

// var key = fs.readFileSync('./andyxie.cn.key')
// var cert = fs.readFileSync('./andyxie.cn.pem')

console.log(crypto.randomUUID())

app.use(bodyParser.json({"limit": "200mb"}));
app.use(express.json());

const stmt = db.prepare("INSERT INTO instrument_entry (uuid, song_name, album_name, link_to, binary, artist) VALUES (?,?,?,?,?,?)")


app.post('/submit', function (req, res) {

    res.header("Access-Control-Allow-Origin", "*");


    try {
        fetch(req.body.file).then(res => {
            res.arrayBuffer().then(r => fs.writeFileSync("./audio_file", Buffer.from(r)));
        })

        res.end("api_success");
    } catch (err) {
        res.status(500).send("Server Error");
        return
    }

    var callback = function (d) {
        console.log(d.toString());
    }
    var errcb = function (d) {
        console.log(d.toString());
    }
    nrc.run(["pip install audio-separator", "audio-separator ./audio_file --model_filename UVR_MDXNET_KARA.onnx  --mdx_segment_size 4000 --mdx_overlap 0.85 --output_format MP3 --mdx_batch_size 20 --output_dir output "], {
        onData: callback,
        onError: errcb
    }).then(r => {

        stmt.run(crypto.randomUUID(), req.body.name, req.body.albumName, req.body.link, fs.readFileSync('./output/audio_file_(Instrumental)_UVR_MDXNET_KARA.mp3'), req.body.artist)
    })

})
app.options('/submit', function (req, res) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Content-Type");
    res.end()
})

app.post('/search_api', function (req, res) {
    function OnFetched(err, rows) {
        try {
            res.header("Access-Control-Allow-Origin", "*");
            console.log("Triggered");
            res.end(JSON.stringify(rows));
        } catch (e) {

        }

    }

    console.log(req.body.searchStr)
    db.all(`SELECT id, uuid, song_name, album_name, artist
            FROM instrument_entry
            WHERE song_name like '%${req.body.searchStr}%'
               or album_name like '%${req.body.searchStr}%'
               or artist like '%${req.body.searchStr}%'`, OnFetched)
})
app.get('/:uuid', function (req, res) {
    async function Provider(err, rows) {
        try {
            res.header("Access-Control-Allow-Origin", "*");
            /** @type {ArrayBuffer}*/
            var buffer = rows[0].binary
            res.setHeader('Content-Length', buffer.byteLength);
            db.all(`SELECT "song_name"
                    FROM instrument_entry
                    WHERE uuid = '${req.params.uuid}'`, (err, row) => {

                res.setHeader('Content-Disposition', 'attachment; filename=' + encodeURI(row[0].song_name)+'.mp3' );
                res.send(buffer)
                res.end()
            })


        } catch (e) {
            console.log(e)
            console.log("Triggered err");

        }
    }

    db.all(`SELECT "binary"
            FROM instrument_entry
            WHERE uuid = '${req.params.uuid}'`, Provider)
})
app.post('/fetch', function (req, res) {
    function Provider(err, rows) {
        try {
            res.header("Access-Control-Allow-Origin", "*");
            console.log(rows[0].binary)
            var str = URL.createObjectURL(new Blob(rows[0].binary))
            console.log(str)
            res.end(JSON.stringify({data: Buffer.from(rows[0].binary).toString('base64')}));


        } catch (e) {
            console.log(e)
            console.log("Triggered err");

        }
    }

    console.log(req.body.uuid)
    db.all(`SELECT "binary"
            FROM instrument_entry
            WHERE uuid = '${req.body.uuid}'`, Provider)

})
app.options('/fetch', function (req, res) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Content-Type");
    res.end()
})

app.options('/search_api', function (req, res) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Content-Type");
    res.end()
})
app.listen(8080)