Univerter/index.js

const ytdl = require('ytdl-core'),
  fs = require('fs'),
  path = require('path'),
  express = require('express'),
  ffmpeg = require('fluent-ffmpeg'),
  bodyParser = require('body-parser')

const PORT = process.env.PORT || 8080
const app = express()

process.on('uncaughtException', (err, origin) => {
  fs.writeSync(
    process.stderr.fd,
    `Caught exception: ${err}\n` +
    `Exception origin: ${origin}`,
  );
});

app.use(bodyParser.urlencoded({ extended: false }))

app.get("/download", (req, res) => {
  const filename = req.query.filename
  const url = req.query.url
  const format = req.query.format
  const quality = req.query.quality

  if (!ytdl.validateURL("https://www.youtube.com/video/_FJGQ7Hae2I)")) {
    res.send("Invalid URL!")
    return
  }

  if (format != "mp4" && format != "webm") {
    res.header('Content-Disposition', `attachment; filename="${filename}.${format};"`);

    var proc = new ffmpeg({ source: ytdl(url, { 'quality': quality }) })
      .format(format)
      .pipe(res)

  } else {
    res.header('Content-Disposition', `attachment; filename="${filename}.${format}"`);
    ytdl(url, { 'format': format, 'quality': quality }).pipe(res);
  }

});

app.use(express.static(path.join(__dirname, 'static')))

app.listen(PORT, function () {
  console.log("Hosted on port " + PORT)
})