plexBot/downloadBot.js

const Telegram = require('telegraf/telegram')
const Telegraf = require('telegraf')
const fs = require('fs')
const https = require('https');
const telegram = new Telegram(process.env.BOT_TOKEN)
const bot = new Telegraf(process.env.BOT_TOKEN)


bot.start( (ctx) => {
  console.log('started:', ctx.from.id)
  return ctx.reply('Welcome!')
})
bot.command('help', (ctx) => ctx.reply('Try send a sticker!'))
bot.hears('hi', (ctx) => ctx.reply('Hey there!'))
bot.hears(/buy/i, (ctx) => ctx.reply('Buy-buy!'))
bot.on('sticker', (ctx) => ctx.reply('👍'))
bot.on('audio', (ctx) => {
	console.log('message received: ', ctx.from.id)
	telegram.getFile( ctx.message.audio.file_id, (ctx) => { 
		console.log('audio_id sent to TG: ', ctx.message.audio.file_id)
	})

	const specialChars = "!@#$^&%*()+=[]\/{}|:<>?,."
	const audio = ctx.message.audio
	var filename = audio.performer + " - " + audio.title
	for (var i = 0; i < specialChars.length; i++) {
		filename = filename.replace(new RegExp("\\" + specialChars[i], 'gi'), '')
	}
	filename = filename + ".mp3"
	const downloadDir = "/var/music/bot/"
	var file = fs.createWriteStream(downloadDir+filename);
        
	const promise = telegram.getFile(audio.file_id)	
	promise.then(function(result){
		const requestFile = https.get("https://api.telegram.org/file/bot"+process.env.BOT_TOKEN+"/"+result.file_path, function(response) {
                	if(response.statusCode != 200){
				return ctx.reply('Error downloading file: '+response.statuscode)
			}else{
				response.pipe(file);
				console.log('Download finished stored at: ' + downloadDir + filename)
        			return ctx.reply('Downloaded "'+ filename + '"')
			}
        	});
	})
})

bot.startPolling()