Mother's Day 2020

Download Mother’s Day card, created by Google Doodle.
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// ==UserScript==
// @name            Mother's Day 2020
// @name:vi         Ngày Của Mẹ 2020
// @namespace       https://lelinhtinh.github.io
// @description     Download Mother’s Day card, created by Google Doodle.
// @description:vi  Tải thiệp Ngày Của Mẹ, được tạo bởi Google Doodle.
// @version         1.2.0
// @icon            https://i.imgur.com/MJayIyA.png
// @author          lelinhtinh
// @oujs:author     baivong
// @license         MIT; https://baivong.mit-license.org/license.txt
// @match           https://*.google.com/logos/2020/mothersday20/*/mothersday20.html*
// @require         https://cdn.jsdelivr.net/npm/[email protected]/selector-set.js
// @require         https://cdn.jsdelivr.net/npm/[email protected]/dist/index.umd.js
// @require         https://cdn.jsdelivr.net/npm/[email protected]/dist/FileSaver.min.js
// @require         https://cdn.jsdelivr.net/npm/[email protected]/build/CCapture.min.js
// @require         https://cdn.jsdelivr.net/npm/[email protected]/src/webm-writer-0.2.0.js
// @supportURL      https://github.com/lelinhtinh/Userscript/issues
// @run-at          document-idle
// @grant           none
// ==/UserScript==

/**
 * Export image or video
 * @type {String} image|video
 */
const EXPORT = 'video';

/**
 * Set filename to be downloaded
 * @type {String}
 */
const FILENAME = 'mothersday20';

/* === DO NOT CHANGE === */

/* global SelectorSet, SelectorObserver, CCapture */
function insertAfter(referenceNode, newNode) {
  referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);
}

function addCssToDocument(css) {
  var style = document.createElement('style');
  style.innerText = css;
  document.head.appendChild(style);
}

let recentUrl = null;
function download(blob, ext) {
  const fileName = `${FILENAME}.${ext}`;

  saveAs(blob, `${FILENAME}.${ext}`);
  if (recentUrl) URL.revokeObjectURL(recentUrl);
  recentUrl = URL.createObjectURL(blob);

  const link = document.querySelector('#mothersday20DownloadBtn');
  const linkText = link.querySelector('.text');

  link.download = fileName;
  link.href = recentUrl;
  linkText.textContent = DOWNLOAD;

  wait = false;
}

function draw(canvas, context, clone) {
  context.fillStyle = canvas.style.backgroundColor;
  context.fillRect(0, 0, clone.width, clone.height);
  context.drawImage(canvas, 0, 0);
}

function cloneCanvas(canvas, callback) {
  const clone = document.createElement('canvas');
  const context = clone.getContext('2d');
  const mouseArea = document.querySelector('.ddlmdsb-V');

  clone.width = mouseArea.width;
  clone.height = mouseArea.height;

  draw(canvas, context, clone);

  callback(context, clone);
}

let captureCanvas = false;
function exportVideo(canvas) {
  cloneCanvas(canvas, (context, clone) => {
    captureCanvas = true;
    const capturer = new CCapture({ format: 'webm' });
    capturer.start();

    (function loop() {
      draw(canvas, context, clone);
      capturer.capture(clone);
      if (captureCanvas) requestAnimationFrame(loop);
    })();

    setTimeout(() => {
      captureCanvas = false;
      capturer.stop();
      capturer.save(blob => {
        download(blob, 'webm');
      });
    }, 3000);
  });
}

function exportImage(canvas) {
  cloneCanvas(canvas, (context, clone) => {
    clone.toBlob(blob => {
      download(blob, 'png');
    }, 'image/png');
  });
}

addCssToDocument(`
a#mothersday20DownloadBtn {
  color: #fff;
  margin: 20px;
  border: none;
  outline: none;
  font-family: unset;
  font-size: 25px;
  height: 61px;
  text-align: center;
  filter: drop-shadow(0px 1px 1px rgba(54,47,39,0.75));
  animation-fill-mode: backwards;
  display: inline-block;
  vertical-align: top;
  line-height: 61px;
  width: 162px;
  text-decoration: none;
  cursor: pointer;
  position: absolute;
  right: 0;
  bottom: -3px;
}

a#mothersday20DownloadBtn:hover {
  transform: scale(1.05);
  filter: drop-shadow(0px 2px 2px rgba(54,47,39,0.75));
}

a#mothersday20DownloadBtn span {
  pointer-events: none;
}

a#mothersday20DownloadBtn span.icon {
  position: relative;
  float: left;
  left: 19px;
  top: 15px;
  width: 35px;
  height: 32px;
  padding: 0;
  margin: 0;
  transform: rotate(270deg);
  clip-path: ellipse(50% 50% at 50% 50%);
}
`);

let DOWNLOAD = 'Download';
let WAITING = 'Waiting...';

const params = new URLSearchParams(location.search);
if (params.has('hl') && params.get('hl') === 'vi') {
  DOWNLOAD = 'Tải xuống';
  WAITING = 'Chờ tí...';
}

let wait = false;
document.addEventListener('click', e => {
  const link = e.target;
  if (link.id !== 'mothersday20DownloadBtn' || link.tagName !== 'A') return;

  e.preventDefault();
  e.stopPropagation();
  if (wait) return;

  const linkText = link.querySelector('.text');
  linkText.textContent = WAITING;
  wait = true;

  const ori = document.querySelector('#hpcanvas');
  EXPORT === 'image' ? exportImage(ori) : exportVideo(ori);
});

const observer = new SelectorObserver.default(document.body, SelectorSet);
observer.observe('.ddlmdsb-G', el => {
  el.style.display = 'none';

  let link = document.querySelector('#mothersday20DownloadBtn');
  if (link === null) {
    link = document.createElement('a');
    link.id = 'mothersday20DownloadBtn';
    link.setAttribute(
      'style',
      'background: url(/logos/2020/mothersday20/r5/main-sprite.png) -1983.75px -264.75px / 2166px 774.75px no-repeat;'
    );
    link.innerHTML = `
      <span class="icon" style="background: url(/logos/2020/mothersday20/r5/main-sprite.png) -170.471px -628.765px / 2151.84px 769.686px no-repeat;"></span>
      <span class="text" style="font-size: 18px;">‪‪${DOWNLOAD}‬‬</span>
    `;
    link.rel = 'noopener';
    insertAfter(el, link);
  }
});