User script that adds a download link to Tested.com premium videos

addDownloadLinkToTested.js

// ==UserScript==
// @name         Tested Premium add downlaod link
// @namespace    http://mrglass.org
// @version      0.1
// @description  Adds a download link to tested premium video pages
// @author       MrGlass
// @match        http://www.tested.com/premium/*
// @grant        none
// ==/UserScript==

var player = document.getElementsByClassName('oo-player')[0]; // Find player div
var video_id = player.getAttribute('data-content-id'); // Pull video ID from player div

// Create download link
var link = document.createElement('a');
link.setAttribute('href', 'http://ak.c.ooyala.com/'+video_id+'/DOcJ-FxaFrRg4gtDEwOjEzYzowazumG4'); // This URL formula was based on looking at the source for the mobile player. Liable to break at any time, your mileage may vary
link.setAttribute('download', document.title.replace(/[^a-zA-Z\d ]/g, "")+'.mkv'); // Make the link download instead of opening
link.innerText = "Download MKV";

// Add link to page
var description = document.getElementsByClassName('description')[0];
description.appendChild(document.createElement('br')); // Add a link break before link
description.appendChild(link); // Add it to the description instead of the player div because the player JS modifies its div