Imgur Mirror

Switches all imgur links to the mirror site http://kageurufu.net/imgur
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// ==UserScript==
// @name         Imgur Mirror
// @namespace    https://greasyfork.org/users/649
// @version      1.1.7
// @description  Switches all imgur links to the mirror site http://kageurufu.net/imgur
// @author       Adrien Pyke
// @include      http*
// @require      https://cdn.jsdelivr.net/gh/fuzetsu/userscripts@ec863aa92cea78a20431f92e80ac0e93262136df/wait-for-elements/wait-for-elements.js
// @grant        none
// ==/UserScript==

(() => {
  'use strict';

  const regex =
    /imgur\.com\/(?!a\/|gallery\/)(?:r\/[a-z0-9_]+\/)?([a-z0-9]+)(\.+[a-z0-9]+)?/iu;
  const extensions = [
    '.jpg',
    '.jpeg',
    '.png',
    '.gif',
    '.gifv',
    '.webm',
    '.mp4'
  ];

  const getNewLink = function (imgurLink, useGif) {
    const match = imgurLink.match(regex);
    if (match) {
      const file = match[1];
      let extension = match[2].toLowerCase();
      if (!extension || !extensions.includes(extension)) {
        extension = '.png';
      } else if (
        extension === '.gifv' ||
        extension === '.gif' ||
        extension === '.webm'
      ) {
        extension = '.mp4';
      }
      if (useGif && extension === '.mp4') {
        extension = '.gif';
      }
      return `http://kageurufu.net/imgur/?${file + extension}`;
    } else {
      return null;
    }
  };

  waitForElems({
    sel: 'img,a',
    onmatch(node) {
      const isImg = node.nodeName === 'IMG';
      const prop = isImg ? 'src' : 'href';
      const newLink = getNewLink(node[prop], isImg);
      if (newLink) {
        node[prop] = newLink;
        if (node.dataset.hrefUrl) {
          node.dataset.hrefUrl = newLink;
        }
        if (node.dataset.outboundUrl) {
          node.dataset.outboundUrl = newLink;
        }
      }
    }
  });
})();