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GreasyFork: download script button

If you have a script manager and you want to download some script without installing it, this script will help

As of 2023-12-19. See the latest version.

  1. // ==UserScript==
  2. // @name          GreasyFork: download script button
  3. // @description   If you have a script manager and you want to download some script without installing it, this script will help
  4. // @author        Konf
  5. // @version       2.2.5
  6. // @namespace     https://greatest.deepsurf.us/users/424058
  7. // @icon          https://greatest.deepsurf.us/vite/assets/blacklogo96-e0c2c761.png
  8. // @match         https://greatest.deepsurf.us/*/scripts/*
  9. // @match         https://sleazyfork.org/*/scripts/*
  10. // @compatible    Chrome
  11. // @compatible    Opera
  12. // @compatible    Firefox
  13. // @run-at        document-end
  14. // @grant         GM_addStyle
  15. // @noframes
  16. // ==/UserScript==
  17.  
  18. /* jshint esversion: 8 */
  19.  
  20. (function() {
  21.   'use strict';
  22.  
  23.   const i18n = {
  24.     download: 'download',
  25.     downloadWithoutInstalling: 'downloadWithoutInstalling',
  26.     failedToDownload: 'failedToDownload',
  27.   };
  28.  
  29.   const translate = (function() {
  30.     const userLang = location.pathname.split('/')[1];
  31.     const strings = {
  32.       'en': {
  33.         [i18n.download]: 'Download ⇩',
  34.         [i18n.downloadWithoutInstalling]: 'Download without installing',
  35.         [i18n.failedToDownload]:
  36.           'Failed to download the script. There is might be more info in the browser console',
  37.       },
  38.       'ru': {
  39.         [i18n.download]: 'Скачать ⇩',
  40.         [i18n.downloadWithoutInstalling]: 'Скачать не устанавливая',
  41.         [i18n.failedToDownload]:
  42.           'Не удалось скачать скрипт. Больше информации может быть в консоли браузера',
  43.       },
  44.       'zh-CN': {
  45.         [i18n.download]: '下载 ⇩',
  46.         [i18n.downloadWithoutInstalling]: '下载此脚本',
  47.         [i18n.failedToDownload]: '无法下载此脚本',
  48.       },
  49.     };
  50.  
  51.     return id => (strings[userLang] || strings.en)[id] || strings.en[id];
  52.   }());
  53.  
  54.   const installBtns = document.querySelectorAll('a.install-link');
  55.   const installArea = document.querySelector('div#install-area');
  56.   const installHelpLinks = document.querySelectorAll('a.install-help-link');
  57.   const suggestion = document.querySelector('div#script-feedback-suggestion');
  58.   const libraryRequire = document.querySelector('div#script-content > p > code');
  59.   const libraryVersion = document.querySelector(
  60.     '#script-stats > dd.script-show-version > span'
  61.   );
  62.  
  63.   // if a script/style is detected
  64.   if (
  65.     installArea &&
  66.     (installBtns.length > 0) &&
  67.     (installBtns.length === installHelpLinks.length)
  68.   ) {
  69.     for (let i = 0; i < installBtns.length; i++) {
  70.       mountScriptDownloadButton(installBtns[i], installArea, installHelpLinks[i]);
  71.     }
  72.   }
  73.   // or maybe a library
  74.   else if (suggestion && libraryRequire) {
  75.     mountLibraryDownloadButton(suggestion, libraryRequire, libraryVersion);
  76.   }
  77.  
  78.   function mountScriptDownloadButton(
  79.     installBtn,
  80.     installArea,
  81.     installHelpLink,
  82.   ) {
  83.     if (!installBtn.href) throw new Error('script href is not found');
  84.  
  85.     // https://img.icons8.com/pastel-glyph/64/ffffff/download.png
  86.     // array to fold the string in a code editor
  87.     const downloadIconBase64 = [
  88.       'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaX',
  89.       'HeAAAABmJLR0QA/wD/AP+gvaeTAAABgUlEQVR4nO3ZTU6DUAAE4HnEk+jWG3TrHV',
  90.       'wY3XoEt23cGleamtRtTbyPS3sCV0bXjptHRAIEsM/hZ76kCZRHGaZAGwDMzMzMbJ',
  91.       '6CasMkMwBncXYbQvhSZZEgecEf56ocmWrDAA4L00eqEMoCBsEFqAOouQB1ADUXoA',
  92.       '6g5gLUAdRcgDqAmgtQB1BzAeoAakkLIHlN8pPkDcnWd59IBpK3cd1VyoxJkfwo3P',
  93.       'V5KJZAcllYtiy8H+LY3HvKjKlPgU1h+hLAuulIiMvWcWzVZ4xL/Dbv+Nsjyax8BM',
  94.       'Sx96Wxm3jzdLwaSliVCpjezucqzmuSfKuZJkvXi0moORKqTOebL2tRwnR3PtdQwv',
  95.       'R3PldRgmznlc8GA4DTOPscQqAqy6x1+X8+6Ke5yfNxIE9z6/TN1+XCM4inuQ165Z',
  96.       'vHz04DF6AOoOYC1AHUXIA6gNpBz/UWJK/2muTvFn1W6lvASXyNXpdTYJcsxf69th',
  97.       '3Y5QjYAiCA485x/tcLgCd1CDMzMzMbum8+xtkWw6QCvwAAAABJRU5ErkJggg==',
  98.     ].join('');
  99.  
  100.     GM_addStyle([`
  101.       .GF-DSB__script-download-button {
  102.         position: relative;
  103.         padding: 8px 22px;
  104.         cursor: pointer;
  105.         border: none;
  106.         background: #0F750F;
  107.         transition: box-shadow 0.2s;
  108.       }
  109.  
  110.       .GF-DSB__script-download-button:hover,
  111.       .GF-DSB__script-download-button:focus {
  112.         box-shadow: 0 8px 16px 0 rgb(0 0 0 / 20%), 0 6px 20px 0 rgb(0 0 0 / 19%);
  113.       }
  114.  
  115.  
  116.       .GF-DSB__script-download-icon {
  117.         position: absolute;
  118.       }
  119.  
  120.       .GF-DSB__script-download-icon--download {
  121.         width: 30px;
  122.         height: 30px;
  123.         top: 4px;
  124.         left: 7px;
  125.       }
  126.  
  127.       .GF-DSB__script-download-icon--loading,
  128.       .GF-DSB__script-download-icon--loading:after {
  129.         border-radius: 50%;
  130.         width: 16px;
  131.         height: 16px;
  132.       }
  133.  
  134.       .GF-DSB__script-download-icon--loading {
  135.         top: 8px;
  136.         left: 11px;
  137.         border-top: 3px solid rgba(255, 255, 255, 0.2);
  138.         border-right: 3px solid rgba(255, 255, 255, 0.2);
  139.         border-bottom: 3px solid rgba(255, 255, 255, 0.2);
  140.         border-left: 3px solid #ffffff;
  141.         transform: translateZ(0);
  142.         object-position: -99999px;
  143.         animation: GF-DSB__script-download-loading-icon 1.1s infinite linear;
  144.       }
  145.  
  146.       @keyframes GF-DSB__script-download-loading-icon {
  147.         0% {
  148.           transform: rotate(0deg);
  149.         }
  150.         100% {
  151.           transform: rotate(360deg);
  152.         }
  153.       }
  154.     `][0]);
  155.  
  156.     const b = document.createElement('a');
  157.     const bIcon = document.createElement('img');
  158.  
  159.     b.href = '#';
  160.     b.title = translate(i18n.downloadWithoutInstalling);
  161.     b.draggable = false;
  162.     b.className = 'GF-DSB__script-download-button';
  163.  
  164.     bIcon.src = downloadIconBase64;
  165.     bIcon.draggable = false;
  166.     bIcon.className =
  167.       'GF-DSB__script-download-icon GF-DSB__script-download-icon--download';
  168.  
  169.     installHelpLink.style.position = 'relative'; // shadows bugfix
  170.  
  171.     b.appendChild(bIcon);
  172.     installArea.insertBefore(b, installHelpLink);
  173.  
  174.     // against doubleclicks
  175.     let isFetchingAllowed = true;
  176.  
  177.     async function clicksHandler(ev) {
  178.       ev.preventDefault();
  179.  
  180.       setTimeout(() => b === document.activeElement && b.blur(), 250);
  181.  
  182.       if (isFetchingAllowed === false) return;
  183.  
  184.       isFetchingAllowed = false;
  185.       bIcon.className =
  186.         'GF-DSB__script-download-icon GF-DSB__script-download-icon--loading';
  187.  
  188.       try {
  189.         let scriptName = installBtn.dataset.scriptName;
  190.  
  191.         if (installBtn.dataset.scriptVersion) {
  192.           scriptName += ` ${installBtn.dataset.scriptVersion}`;
  193.         }
  194.  
  195.         await downloadScript({
  196.           fileExt: `.user.${installBtn.dataset.installFormat || 'txt'}`,
  197.           href: installBtn.href,
  198.           name: scriptName,
  199.         });
  200.       } catch (e) {
  201.         console.error(e);
  202.         alert(`${translate(i18n.failedToDownload)}: \n${e}`);
  203.       } finally {
  204.         setTimeout(() => {
  205.           isFetchingAllowed = true;
  206.           bIcon.className =
  207.             'GF-DSB__script-download-icon GF-DSB__script-download-icon--download';
  208.         }, 300);
  209.       }
  210.     }
  211.  
  212.     b.addEventListener('click', clicksHandler);
  213.     b.addEventListener('auxclick', e => e.button === 1 && clicksHandler(e));
  214.   }
  215.  
  216.   function mountLibraryDownloadButton(suggestion, libraryRequire, libraryVersion) {
  217.     let [
  218.       libraryHref,
  219.       libraryName,
  220.     ] = libraryRequire.innerText.match(
  221.       /\/\/ @require (https:\/\/.+\/scripts\/\d+\/\d+\/(.*)\.js)/
  222.     ).slice(1);
  223.  
  224.     // this probably is completely useless but whatever
  225.     if (!libraryHref) throw new Error('library href is not found');
  226.  
  227.     if (libraryVersion?.innerText) libraryName += ` ${libraryVersion.innerText}`;
  228.  
  229.     GM_addStyle([`
  230.       .GF-DSB__library-download-button {
  231.         transition: box-shadow 0.2s;
  232.       }
  233.  
  234.       .GF-DSB__library-download-button--loading {
  235.         animation: GF-DSB__loading-text 1s infinite linear;
  236.       }
  237.  
  238.       @keyframes GF-DSB__loading-text {
  239.         50% {
  240.           opacity: 0.4;
  241.         }
  242.       }
  243.     `][0]);
  244.  
  245.     const b = document.createElement('a');
  246.  
  247.     b.href = '#';
  248.     b.draggable = false;
  249.     b.innerText = translate(i18n.download);
  250.     b.className = 'GF-DSB__library-download-button';
  251.  
  252.     suggestion.appendChild(b);
  253.  
  254.     // against doubleclicks
  255.     let isFetchingAllowed = true;
  256.  
  257.     async function clicksHandler(ev) {
  258.       ev.preventDefault();
  259.  
  260.       setTimeout(() => b === document.activeElement && b.blur(), 250);
  261.  
  262.       if (isFetchingAllowed === false) return;
  263.  
  264.       isFetchingAllowed = false;
  265.       b.className =
  266.         'GF-DSB__library-download-button GF-DSB__library-download-button--loading';
  267.  
  268.       try {
  269.         await downloadScript({
  270.           fileExt: '.js',
  271.           href: libraryHref,
  272.           name: libraryName,
  273.         });
  274.       } catch (e) {
  275.         console.error(e);
  276.         alert(`${translate(i18n.failedToDownload)}: \n${e}`);
  277.       } finally {
  278.         setTimeout(() => {
  279.           isFetchingAllowed = true;
  280.           b.className = 'GF-DSB__library-download-button';
  281.         }, 300);
  282.       }
  283.     }
  284.  
  285.     b.addEventListener('click', clicksHandler);
  286.     b.addEventListener('auxclick', e => e.button === 1 && clicksHandler(e));
  287.   }
  288.  
  289.   // utils --------------------------------------------------------------------
  290.  
  291.   // Is needed because you can't fetch a new format script link
  292.   // due to different domain cors restriction...
  293.   function convertScriptHrefToAnOldFormat(href) {
  294.     const regex = /https:\/\/update\.(\w+\.org)\/scripts\/(\d+)\/(\d+\/)?(.+)/;
  295.     const match = href.match(regex);
  296.  
  297.     if (!match) throw new Error("can't convert href to an old format");
  298.  
  299.     const domain = match[1];
  300.     const scriptId = match[2];
  301.     const version = match[3] ? `?version=${match[3]}` : '';
  302.     const scriptName = match[4];
  303.  
  304.     return `https://${domain}/scripts/${scriptId}/code/${scriptName}${version}`;
  305.   }
  306.  
  307.   async function downloadScript({
  308.     fileExt = '.txt',
  309.     href,
  310.     name = Date.now(),
  311.   } = {}) {
  312.     if (!href) throw new Error('Script href is missing');
  313.  
  314.     const fetchErrors = [];
  315.     let url;
  316.  
  317.     // Consider first attempt as a main one. Second one is
  318.     // needed just for some unknown edge case scenarios. See link:
  319.     // https://greatest.deepsurf.us/scripts/420872/discussions/216921
  320.     for (const scriptHref of [
  321.       convertScriptHrefToAnOldFormat(href),
  322.       href,
  323.     ]) {
  324.       try {
  325.         const response = await fetch(scriptHref);
  326.  
  327.         if (response.status !== 200) {
  328.           throw new Error(`Bad response: ${response.status}`);
  329.         }
  330.  
  331.         url = window.URL.createObjectURL(await response.blob());
  332.       } catch (e) {
  333.         fetchErrors.push(e);
  334.       }
  335.     }
  336.  
  337.     if (!url) {
  338.       fetchErrors.forEach(e => console.error(e));
  339.  
  340.       throw new Error('Failed to fetch. See console');
  341.     }
  342.  
  343.     const a = document.createElement('a');
  344.  
  345.     a.href = url;
  346.     a.download = `${name}${fileExt}`;
  347.     document.body.appendChild(a); // is needed due to firefox bug
  348.     a.click();
  349.     a.remove();
  350.  
  351.     window.URL.revokeObjectURL(url);
  352.   }
  353. }());