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baivong / Wallpaperscraft downloader

// ==UserScript==
// @name            Wallpaperscraft downloader
// @name:vi         Wallpaperscraft downloader
// @namespace       http://baivong.github.io/
// @version         2.1.7
// @description     1-Click download on WallpapersCraft. You should select the resolution before downloading.
// @description:vi  Tải hình nền từ WallpapersCraft chỉ với 1-Click. Bạn có thể chọn độ phân giải ảnh trước khi tải.
// @icon            http://i.imgur.com/NA96TWE.png
// @author          Zzbaivong
// @oujs:author     baivong
// @license         MIT; https://baivong.mit-license.org/license.txt
// @include         https://wallpaperscraft.com/*
// @exclude         https://wallpaperscraft.com/wallpaper/*
// @exclude         https://wallpaperscraft.com/download/*
// @require         https://unpkg.com/file-saver@2.0.1/dist/FileSaver.min.js
// @require         https://greasemonkey.github.io/gm4-polyfill/gm4-polyfill.js?v=a834d46
// @noframes
// @connect         self
// @supportURL      https://github.com/lelinhtinh/Userscript/issues
// @run-at          document-idle
// @grant           GM.xmlHttpRequest
// @grant           GM_xmlhttpRequest
// @grant           GM.openInTab
// @grant           GM_openInTab
// ==/UserScript==

(function() {
  'use strict';

  /**
   * Resolution config
   * @type {String} // Eg: 1920x1200, 1366x768, 1280x1024, ...
   */
  var resolution = '';

  // Do not change the code below this line, unless you know how.
  var list = document.querySelectorAll('.wallpapers__link');
  if (!/\d+x\d+/.test(resolution)) resolution = screen.width + 'x' + screen.height;

  [].forEach.call(list, function(link) {
    var info = link.querySelector('.wallpapers__info'),
      infoContent = info.innerHTML,
      img = link.querySelector('img'),
      imgName,
      res;

    res = !info ? resolution : info.textContent.match(/\d+x\d+/)[0];

    if (!img) return;
    img = img.src.replace(/\d+x\d+/, res);
    imgName = img.replace(/.*\//, '');

    link.addEventListener('click', function(e) {
      e.preventDefault();
      info.innerHTML = 'Downloading...';

      GM.xmlHttpRequest({
        method: 'GET',
        url: img,
        responseType: 'blob',
        onprogress: function(e) {
          var percent = Math.round((e.loaded / e.total) * 100);
          info.innerHTML = percent + ' %';
        },
        onload: function(response) {
          if (response.status !== 200) {
            info.innerHTML = '<span style="color:red">' + res + ' resolution is not available</span>';
            return;
          }

          var blob = response.response;

          info.innerHTML = infoContent;
          link.setAttribute('href', URL.createObjectURL(blob));
          link.setAttribute('download', imgName);

          saveAs(blob, imgName);
        },
        onerror: function(err) {
          info.innerHTML = '<span style="color:red">' + err.message + '</span>';
          console.error(err);
        },
      });
    });

    link.addEventListener('contextmenu', function(e) {
      e.preventDefault();
      GM.openInTab(img);
    });

    link.setAttribute('title', 'Click to download this image\nRight Click to open in new tab');
  });
})();