Add a Download button below the currently viewing video on GRIPS OTH-Regensburg elearning.uni-regensburg.de

elearning.uni-regensburg.de_add-video-download-button.user.js

// ==UserScript==
// @name        elearning.uni-regensburg.de_add-video-download-button.user
// @description Add a Download button below the currently viewing video on GRIPS OTH-Regensburg elearning.uni-regensburg.de
// @match       *://elearning.uni-regensburg.de/*
// @version     1.0.0
// @grant       none
// @author      Lukas Wolfsteiner <lukas@wolfsteiner.media>
// ==/UserScript==

// get all iframes
var frames = document.getElementsByTagName("iframe");

// for each iframe
for (var frameId = 0; frameId < frames.length; ++frameId) {
    var frameSrc = frames[frameId].src;

    // check if is video
    if (/^https?:\/\/([a-zA-Z\d-]+\.){0,}vimp\.oth-regensburg\.de\/media/.test(frameSrc)) {

        // if yes, parse the video key
        var frameUrl = new URL(frameSrc);
        var frameKey = frameUrl.searchParams.get('key');
        console.log(frameKey);

        // var videoUrl = `https://vimp.oth-regensburg.de/getMedium/${frameKey}.mp4`;
        var videoUrl = `https://vimp.oth-regensburg.de/getMedia.php?key=${frameKey}&type=mp4`;

        var buttonDownload = `<br><a class="btn btn-primary downloadMedia" href="${videoUrl}"><i class="icon-cloud-download"></i> Download</a>`;

        // if video key if defined
        if (!!frameKey) {
            // frames[frameId].parentElement.innerHTML += '<br><a class="btn btn-primary downloadMedia" href="https://vimp.oth-regensburg.de/media/download/format/none/key/' + frameKey + '.mp4"><i class="icon-cloud-download"></i> Download</a>';
            frames[frameId].parentElement.innerHTML += buttonDownload;
            console.log('added button');
        } else {
            console.log('couldnt parse key from url: ' + frameSrc);
        }

        // Only works on Chrome/Firefox; Safari is unsupported
        //var downloading = browser.downloads.download({
        //    url: videoUrl,
        //    saveAs: true
        //});
    }
}