Automagically join the Rakuten lottery every day

rakuten-lottery.user.js

// ==UserScript==
// @name         Rakuten Lottery
// @namespace    http://tampermonkey.net/
// @version      0.1.0
// @description  Automagically join the Rakuten lottery every day
// @author       danikaze
// @homepage     https://gist.github.com/danikaze/
// @match        *://*/*
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_xmlhttpRequest
// @connect      rakuten.co.jp
// ==/UserScript==
(function() {
  'use strict';
  const tm = new Date().getTime();

  /**
   * Rakuten Lottery page referral could change, so we get the proper URL from the Top Page
   */
  function getLotteryUrl() {
    return new Promise((resolve, reject) => {
      function checkPage(res) {
        const re = /<a href="(https:\/\/rd.rakuten.co.jp\/s\/\?R2=https%3A%2F%2Fkuji.rakuten.co.jp[^"]+)"/;
        let match = re.exec(res.responseText);
        if (match) {
          resolve(decodeURIComponent(match[1]));
        } else {
          reject();
        }
      }

      const request = GM_xmlhttpRequest({
        method: 'GET',
        url: 'https://www.rakuten.co.jp/',
        onload: checkPage,
        onerror: reject,
        headers: {
          Origin: 'https://www.rakuten.co.jp/',
        }
      });
    });
  }

  /**
   * Try to enter the Rakuten Lottery (need to be logged into rakuten.co.jp)
   */
  async function enterLottery() {
    return new Promise((resolve, reject) => {
      // Nacho:
      // https://kuji.rakuten.co.jp/8d82d77188/dXlwUldJN3hmelVLbG9FY0s1bzRDdz09Cg==/accept?flash_version=undefined&os=MacIntel&useragent=Mozilla/5.0%20(Macintosh;%20Intel%20Mac%20OS%20X%2010_12_6)%20AppleWebKit/537.36%20(KHTML,%20like%20Gecko)%20Chrome/70.0.3538.110%20Safari/537.36
      // https://kuji.rakuten.co.jp/8d82d77188/dXlwUldJN3hmelVLbG9FY0s1bzRDdz09Cg==/decide?flash_version=undefined&os=MacIntel&useragent=Mozilla/5.0%20(Macintosh;%20Intel%20Mac%20OS%20X%2010_12_6)%20AppleWebKit/537.36%20(KHTML,%20like%20Gecko)%20Chrome/70.0.3538.110%20Safari/537.36

      function checkResult(res) {
        debugger;
      }

      getLotteryUrl().then((url) => {
        const request = GM_xmlhttpRequest({
          url,
          method: 'GET',
          onload: checkResult,
          onerror: reject,
        });
      });
    });
  }

  /**
   * Generate a ID for elements without conflicts
   */
  function getCssId(id) {
    return `tm-rakuten-lottery-${tm}-${id}`;
  }

  /**
   * Create a generic (styled) popup to display a title and a msg
   */
  function createPopup(title, msg) {
    const popupElem = document.createElement('div');
    const headerId = getCssId('popup-header');
    const closeButtonId = getCssId('popup-button');
    const titleId = getCssId('popup-title');
    const msgId = getCssId('popup-msg');

    popupElem.id = getCssId('popup');
    popupElem.innerHTML = `
      <div id="${headerId}">
        <div id="${titleId}">${title}</div>
        <div id="${closeButtonId}">✖︎</div>
      </div>
      <div id="${msgId}">${msg}</div>
    `;
    popupElem.style = `
      position: fixed;
      top: 20px;
      right: 20px;
      z-index: 65000;
      width: 200px;
      border-radius: 8px;
      box-shadow: 0px 0px 10px 0px rgba(0, 0, 0, 0.5);
    `;

    const headerElem = popupElem.querySelector(`#${headerId}`);
    headerElem.style = `
      background: #b70700;
      color: white;
      padding: 5px;
      padding-left: 10px;
      border-top-right-radius: 8px;
      border-top-left-radius: 8px;
    `;

    const titleElem = popupElem.querySelector(`#${titleId}`);
    titleElem.style = `
      font-weight: bold;
    `;

    const closeButtonElem = popupElem.querySelector(`#${closeButtonId}`);
    closeButtonElem.addEventListener('click', () => popupElem.parentElement.removeChild(popupElem));
    closeButtonElem.style = `
      position: absolute;
      right: 7px;
      top: 5px;
      cursor: pointer;
    `;

    const msgElem = popupElem.querySelector(`#${msgId}`);
    msgElem.style = `
      padding: 10px;
      background: #fff;
      border-bottom-right-radius: 8px;
      border-bottom-left-radius: 8px;
    `;

    document.body.appendChild(popupElem);
  }

  /**
   * When winning the lottery, show a message notifying about it
   */
  function showAtari(points) {
    createPopup(
      'TM Rakuten Lottery',
      `You won <strong>${points === 1 ? '1 point' : `${points} points`}</strong> in today's Rakuten Lottery!`,
    );
  }

  /**
   * When not winning, still show a notification message about it
   */
  function showHazure() {
    createPopup(
      'TM Rakuten Lottery',
      `You didn\'t win anything in today's Rakuten Lottery...`,
    );
  }

  /**
   * Check if it already entered for today
   */
  function needsToRun() {
    var now = new Date();
    var m = now.getMonth();
    var d = now.getDate();
    var y = now.getFullYear();

    var today = new Date(y,m,d);
    if (GM_getValue("lastRun", 0) < today) {
      GM_setValue("lastRun", today);
      return true;
    }
    return false;
  }

  /**
   * EXECUTION
   */
  if (true || needsToRun()) {
    enterLottery().then((result) => {
      if (result.win) {
        showAtari(result.points);
      } else {
        showHazure();
      }
    }).catch(() => {
      // if there's an error entering, set it to try again next time
      GM_setValue("lastRun", 0);
    });
  }
})();