tidal-hifi/src/preload.js

const { setTitle } = require("./scripts/window-functions");
const { dialog, process } = require("electron").remote;
const { store, settings } = require("./scripts/settings");
const { ipcRenderer } = require("electron");
const { app } = require("electron").remote;
const { downloadFile } = require("./scripts/download");
const statuses = require("./constants/statuses");
const hotkeys = require("./scripts/hotkeys");
const globalEvents = require("./constants/globalEvents");
const notifier = require("node-notifier");
const notificationPath = `${app.getPath("userData")}/notification.jpg`;
let currentSong = "";
let player;
let currentPlayStatus = statuses.paused;
let barvalue;
let updatecurrent = false;
let oldcurrent;

const elements = {
  play: '*[data-test="play"]',
  pause: '*[data-test="pause"]',
  next: '*[data-test="next"]',
  previous: 'button[data-test="previous"]',
  title: '*[data-test^="footer-track-title"]',
  artists: '*[data-test^="grid-item-detail-text-title-artist"]',
  home: '*[data-test="menu--home"]',
  back: '[class^="backwardButton"]',
  forward: '[class^="forwardButton"]',
  search: '[class^="searchField"]',
  shuffle: '*[data-test="shuffle"]',
  repeat: '*[data-test="repeat"]',
  block: '[class="blockButton"]',
  account: '*[data-test^="profile-image-button"]',
  settings: '*[data-test^="open-settings"]',
  media: '*[data-test="current-media-imagery"]',
  image: "img",
  url: 'a[href*="/track/"]',
  current: '*[data-test="current-time"]',
  duration: '*[data-test="duration-time"]',
  bar: '*[data-test="progress-bar"]',

  /**
   * Get an element from the dom
   * @param {*} key key in elements object to fetch
   */
  get: function (key) {
    return window.document.querySelector(this[key.toLowerCase()]);
  },

  /**
   * Get the icon of the current song
   */
  getSongIcon: function () {
    const figure = this.get("media");

    if (figure) {
      const mediaElement = figure.querySelector(this["image"]);
      if (mediaElement) {
        return mediaElement.src;
      }
    }

    return "";
  },

  /**
   * Shorthand function to get the text of a dom element
   * @param {*} key key in elements object to fetch
   */
  getText: function (key) {
    const element = this.get(key);
    return element ? element.textContent : "";
  },

  /**
   * Shorthand function to click a dom element
   * @param {*} key key in elements object to fetch
   */
  click: function (key) {
    this.get(key).click();
    return this;
  },

  /**
   * Shorthand function to focus a dom element
   * @param {*} key key in elements object to fetch
   */
  focus: function (key) {
    return this.get(key).focus();
  },
};

/**
 * Play or pause the current song
 */
function playPause() {
  const play = elements.get("play");

  if (play) {
    elements.click("play");
  } else {
    elements.click("pause");
  }
}

/**
 * Add hotkeys for when tidal is focused
 * Reflects the desktop hotkeys found on:
 * https://defkey.com/tidal-desktop-shortcuts
 */
function addHotKeys() {
  if (store.get(settings.enableCustomHotkeys)) {
    hotkeys.add("Control+p", function () {
      elements.click("account").click("settings");
    });
    hotkeys.add("Control+l", function () {
      handleLogout();
    });

    hotkeys.add("Control+h", function () {
      elements.click("home");
    });

    hotkeys.add("backspace", function () {
      elements.click("back");
    });

    hotkeys.add("shift+backspace", function () {
      elements.click("forward");
    });

    hotkeys.add("control+u", function () {
      // reloading window without cache should show the update bar if applicable
      window.location.reload(true);
    });

    hotkeys.add("control+r", function () {
      elements.click("repeat");
    });
  }

  // always add the hotkey for the settings window
  hotkeys.add("control+=", function () {
    ipcRenderer.send(globalEvents.showSettings);
  });
}

/**
 * This function will ask the user whether he/she wants to log out.
 * It will log the user out if he/she selects "yes"
 */
function handleLogout() {
  const logoutOptions = ["Cancel", "Yes, please", "No, thanks"];

  dialog.showMessageBox(
    null,
    {
      type: "question",
      title: "Logging out",
      message: "Are you sure you want to log out?",
      buttons: logoutOptions,
      defaultId: 2,
    },
    function (response) {
      if (logoutOptions.indexOf("Yes, please") == response) {
        for (let i = 0; i < window.localStorage.length; i++) {
          const key = window.localStorage.key(i);
          if (key.startsWith("_TIDAL_activeSession")) {
            window.localStorage.removeItem(key);
            i = window.localStorage.length + 1;
          }
        }
        window.location.reload();
      }
    }
  );
}

/**
 * Add ipc event listeners.
 * Some actions triggered outside of the site need info from the site.
 */
function addIPCEventListeners() {
  window.addEventListener("DOMContentLoaded", () => {
    ipcRenderer.on("globalEvent", (event, args) => {
      switch (args) {
        case globalEvents.playPause:
          playPause();
          break;
        case globalEvents.next:
          elements.click("next");
          break;
        case globalEvents.previous:
          elements.click("previous");
          break;
        case globalEvents.play:
          elements.click("play");
          break;
        case globalEvents.pause:
          elements.click("pause");
          break;
      }
    });
  });
}

/**
 * Update the current status of tidal (e.g playing or paused)
 */
function getCurrentlyPlayingStatus() {
  let pause = elements.get("pause");
  let status = undefined;

  // if pause button is visible tidal is playing
  if (pause) {
    status = statuses.playing;
  } else {
    status = statuses.paused;
  }
  return status;
}

/**
 * Update Tidal-hifi's media info
 *
 * @param {*} options
 */
function updateMediaInfo(options, notify) {
  if (options) {
    ipcRenderer.send(globalEvents.updateInfo, options);
    store.get(settings.notifications) && notify && notifier.notify(options);

    if (player) {
      player.metadata = {
        ...player.metadata,
        ...{
          "xesam:title": options.title,
          "xesam:artist": [options.artists],
          "mpris:artUrl": options.image,
        },
      };
      player.playbackStatus = options.status == statuses.paused ? "Paused" : "Playing";
    }
  }
}

/**
 * Watch for song changes and update title + notify
 */
setInterval(function () {
  const title = elements.getText("title");
  const url = elements.get("url").href.replace(/[^0-9]/g, "");
  const artists = elements.getText("artists");
  const current = elements.getText("current");
  const duration = elements.getText("duration");
  const barval = elements.get("bar").getAttribute("aria-valuenow");
  const songDashArtistTitle = `${title} - ${artists}`;
  const currentStatus = getCurrentlyPlayingStatus();
  const options = {
    title,
    message: artists,
    status: currentStatus,
    url: `https://tidal.com/browse/track/${url}`,
    current: current,
    duration: duration,
  };

  const playStatusChanged = currentStatus !== currentPlayStatus;
  const barvalChanged = barval !== barvalue;
  const titleOrArtistChanged = currentSong !== songDashArtistTitle;

  if (titleOrArtistChanged || playStatusChanged || barvalChanged || updatecurrent) {
    // update title and play info with new info
    setTitle(songDashArtistTitle);
    currentSong = songDashArtistTitle;
    currentPlayStatus = currentStatus;

    // check progress bar value and make sure current stays up to date after switch
    if(barvalue != barval) {
      barvalue = barval;
      oldcurrent = options.current;
      options.duration = duration;
      updatecurrent = true;
    }

    if(updatecurrent) {
      if(options.current == oldcurrent && currentStatus != "paused") return;
      oldcurrent = options.current;
      updatecurrent = false;
    }

    // make sure current is set to 0 if title changes
    if(titleOrArtistChanged) {
      options.current = "0:00";
      oldcurrent = options.current;
      barvalue = barval;
    }

    const image = elements.getSongIcon();

    new Promise((resolve) => {
      if (image.startsWith("http")) {
        downloadFile(image, notificationPath).then(
          () => {
            options.icon = notificationPath;
            resolve();
          },
          () => {
            // if the image can't be downloaded then continue without it
            resolve();
          }
        );
      } else {
        // if the image can't be found on the page continue without it
        resolve();
      }
    }).then(
      () => {
        updateMediaInfo(options, titleOrArtistChanged);
      },
      () => {}
    );
  }
}, 200);

if (process.platform === "linux" && store.get(settings.mpris)) {
  try {
    const Player = require("mpris-service");
    player = Player({
      name: "tidal-hifi",
      identity: "tidal-hifi",
      supportedUriSchemes: ["file"],
      supportedMimeTypes: [
        "audio/mpeg",
        "audio/flac",
        "audio/x-flac",
        "application/ogg",
        "audio/wav",
      ],
      supportedInterfaces: ["player"],
      desktopEntry: "tidal-hifi",
    });

    // Events
    var events = {
      next: "next",
      previous: "previous",
      pause: "pause",
      playpause: "playpause",
      stop: "stop",
      play: "play",
      loopStatus: "repeat",
      shuffle: "shuffle",
      seek: "seek",
    };
    Object.keys(events).forEach(function (eventName) {
      player.on(eventName, function () {
        const eventValue = events[eventName];
        switch (events[eventValue]) {
          case events.playpause:
            playPause();
            break;

          default:
            elements.click(eventValue);
        }
      });
    });

    player.on("quit", function () {
      app.quit();
    });
  } catch (exception) {
    console.log("player api not working");
  }
}

addHotKeys();
addIPCEventListeners();