Redirect Medium posts to ReadMedium.com

unlock-medium.user.js

// ==UserScript==
// @name         Redirect Medium posts to ReadMedium.com
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Redirect Medium posts to ReadMedium.com
// @author       Llama 3
// @match       *://*/*
// @grant        none
// ==/UserScript==

(function() {
  'use strict';
  var mediumMetaTag = document.querySelector('meta[property="al:android:app_name"][content="Medium"]');

  if (mediumMetaTag) {
    var ogUrlMetaTag = document.querySelector('meta[property="og:url"]');
    if (ogUrlMetaTag) {
      var postId = getPostIdFromOgUrl(ogUrlMetaTag.content);
      if (postId) {
        var redirectUrl = 'https://readmedium.com/' + postId;
        window.location.href = redirectUrl;
      }
    }
  }
})();

function getPostIdFromOgUrl(ogUrl) {
  var urlParts = ogUrl.split('/');
  return urlParts[urlParts.length - 1];
}