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zachhardesty7 / Soundcloud - Add External Download Button

// ==UserScript==
// @name         Soundcloud - Add External Download Button
// @namespace    https://zachhardesty.com
// @author       Zach Hardesty <zachhardesty7@users.noreply.github.com> (https://github.com/zachhardesty7)
// @description  adds a button on main page and song page to download song automatically from https://soundcloudmp3.org/
// @copyright    2019, Zach Hardesty (https://zachhardesty.com/)
// @license      GPL-3.0-only; http://www.gnu.org/licenses/gpl-3.0.txt
// @version      2.1.3

// @homepageURL  https://github.com/zachhardesty7/tamper-monkey-scripts-collection/raw/master/soundcloud-download-button.user.js
// @homepageURL  https://openuserjs.org/scripts/zachhardesty7/Soundcloud_-_Add_External_Download_Button
// @supportURL   https://github.com/zachhardesty7/tamper-monkey-scripts-collection/issues

// @updateURL    https://openuserjs.org/meta/zachhardesty7/Soundcloud_-_Add_External_Download_Button.meta.js
// @downloadURL  https://openuserjs.org/src/scripts/zachhardesty7/Soundcloud_-_Add_External_Download_Button.user.js

// @match        https://soundcloud.com/*
// @match        https://loader.to/*
// @require      https://greasyfork.org/scripts/419640-onelementready/code/onElementReady.js?version=887637
// ==/UserScript==
/* global onElementReady */

/**
 * adds button to soundcloud
 *
 * @param {HTMLElement} el - most recently added children (for lazy load)
 */
function addSoundcloudDownloadButton(el) {
  const link = window.location.href
  const button = document.createElement("button")
  button.textContent = "External Download"

  // if on soundcloud home and song node is not a playlist, append SC styled button
  if (
    link.includes("stream") &&
    !(
      /** @type {HTMLAnchorElement} */ (
        el.querySelector(".soundTitle__title")
      ).href.includes("/sets/")
    )
  ) {
    button.className = "mp3-button sc-button sc-button-small"
    el.querySelector(".soundActions .sc-button-group").append(button)
    // else if on individual song page (and not playlist), append SC styled button
  } else if (
    !link.includes("stream") &&
    (!link.includes("/sets/") || link.includes("?in="))
  ) {
    const toolbar = document.querySelector(".soundActions div:first-child")
    button.className = "mp3-button sc-button sc-button-medium"
    toolbar.append(button)
  }

  el.querySelector(".mp3-button").addEventListener("click", () => {
    window.open(
      `https://loader.to/?link=${link}&f=1&s=1&e=1&r=ddownr`,
      "_blank"
    )
  })
}

// auto-run on soundcloud mp3
// if referred from soundcloud, grab data from GM storage
// paste and submit to begin conversion to mp3
function mp3() {
  const { href } = window.location
  if (href.includes("loader.to")) {
    onElementReady(
      "#ds .card .section:last-of-type > progress",
      { findOnce: false },
      (/** @type {HTMLProgressElement} */ progress) => {
        const timer = setInterval(() => {
          if (progress.value === 1000) {
            const button = document.querySelector(
              "#ds .card .section:last-of-type > a"
            )
            button.click()
            clearInterval(timer)
          }
        }, 100)
      }
    )
  } else {
    onElementReady(
      ".l-listen-wrapper",
      { findOnce: false },
      addSoundcloudDownloadButton
    )
    onElementReady(
      ".lazyLoadingList__list > .soundList__item",
      { findOnce: false },
      addSoundcloudDownloadButton
    )
  }
}

mp3()