SoundCloud mp3 Download Index.js File

sc_index.js

import { spawn } from 'child_process';
import { parse } from 'node-html-parser';

const client_id = process.env.SOUNDCLOUD_CLIENT_ID;

const link = process.argv[2] || 'https://soundcloud.com/rashidaliofficial/kabhi-kabhi-aditi';


/*
 * Download SoundCloud track page HTML code
*/


const getSoundCloundHtml = () => {
  return new Promise((resolve, reject) => {
    const scUrl = link;
    const curl = spawn("curl", [
      "-A",
      "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Safari/605.1.15",
      scUrl
    ]);

    let chunks = [];
    curl.stdout.on("data", data => { chunks.push(data); });
    curl.stderr.on("data", data => { console.log(`stderr: ${data}`); });
    curl.on('error', (error) => {
      console.log(`error: ${error.message}`);
      reject(error);
    });
    curl.on("close", () => {
      let body = Buffer.concat(chunks);
      resolve(body.toString());
    });
  });
};

/*
 * Get m3u8 playlist link from SoundCloud
*/
const getPlaylistLink = (url) => {
  return new Promise((resolve, reject) => {
    const curl = spawn("curl", ["--location", "--request", "GET", url]);

    let chunks = [];
    curl.stdout.on("data", data => { chunks.push(data); });
    curl.stderr.on("data", data => { console.log(`stderr: ${data}`); });
    curl.on('error', (error) => {
      console.log(`error: ${error.message}`);
      reject(error);
    });
    curl.on("close", () => {
      let body = Buffer.concat(chunks);
      resolve(body.toString());
    });
  });
};


/*
 * Save mp3 file on disk
*/
const saveTrack = (playlistUrl) => {
  return new Promise((resolve, reject) => {
    const tmp = link.split('/')
    const fileName = `${tmp[tmp.length - 1]}.mp3`;
    const ffmpeg = spawn("ffmpeg", ["-i", playlistUrl, fileName]);
    
    ffmpeg.on('error', (error) => {
      console.log(`error: ${error.message}`);
      reject(error);
    });
    
    ffmpeg.on("close", () => {
      console.log('done');
      resolve('done');
    });
  });
};

async function main () {
  let dataText = '';

  // Step 1 : Download HTML
  const html = await getSoundCloundHtml();
  const root = parse(html);

  // Step 2: Parse html and get the script tag
  root.querySelectorAll('script').forEach((el, idx) => {
    if (el.innerText.startsWith('window.__sc_hydration')) {
      dataText = el.innerText;
    }
  });

  // Step 3: Execute the javascript, and get the link for m3u8 playlist
  let x;
  let startIndex = dataText.indexOf('[');
  let endIndex = dataText.lastIndexOf(']');
  let str = dataText.substring(startIndex, endIndex + 1);
  eval('x = ' + str);

  const url = `${x[7].data.media.transcodings[0].url}?client_id=${client_id}&track_authorization=${x[7].data.track_authorization}`;
  
  // Step 4: Download m3u8 playlist file
  const playlistUrl = await getPlaylistLink(url);
  
  // Step 5: Save the mp3 file using ffmpeg
  const result = await saveTrack(JSON.parse(playlistUrl).url);
  
  console.log(result);
}

main();