Script to download Quran audio

download_quran_audio.js

import { createWriteStream, existsSync, mkdirSync } from "fs";
import { join } from "path";
import { pipeline } from "stream/promises";

/**
 * To get `qari_dir`:
 * 1. Go to https://quranicaudio.com
 * 2. Choose qari
 * 3. Hover to the download button, you will see the download link contains qari directory
 *
 * Run:
 * `node download.mjs` or `deno download.js` or `bun download.js`
 */

const qari_dir = `abdurrashid_sufi`; // TODO: use cli args
const base_url = `https://download.quranicaudio.com/quran/${qari_dir}/`;
const task_limit = 17;
const semaphores = [];
const logs = [];
const report_interval = setInterval(report, 500);
const started_at = Date.now();

if (!existsSync(qari_dir)) mkdirSync(qari_dir);

function report() {
  const cols = 6;
  const clean_logs = logs.filter(Boolean);
  console.clear();
  for (let i = 0; i < clean_logs.length; i += cols) {
    console.log(clean_logs.slice(i, i + cols).join(" | "));
  }
}

async function download(name) {
  const file = name + ".mp3";
  const res = await fetch(base_url + file);
  if (!res.ok || !res.body) return `FAIL`;

  const stream = createWriteStream(join(qari_dir, file));
  await pipeline(res.body, stream);
  return `DONE`;
}

await Promise.all(
  Array.from({ length: 114 }).map(async (_, index) => {
    const curr_index = index % task_limit;
    const prev_task = semaphores[curr_index];
    semaphores[curr_index] = new Promise(async (resolve) => {
      if (prev_task) await prev_task;

      const name = String(index + 1).padStart(3, "0");
      logs[index] = `${name}..    `;

      const result = await download(name);
      resolve(result);

      logs[index] = `${name}..${result}`;
    });
    return semaphores[curr_index];
  })
);

clearInterval(report_interval);
report();

console.log(`\ncompleted in ${(Date.now() - started_at) / 1_000}s`);