download all class dojo media files.

classdojo_media_files.js

(function classdojo_scroll() {

    var page_scroll_delay = 5000; // ms
    var offset = 0; // localStorage.getItem('offset') || 0;
    console.log('inital offset:', offset);
    window.all_media_urls = new Map();

    // return false if scroll to the end..
    function scroll_down() {
        offset += 800;
        window.scroll(0, offset);
        console.log('offset:' + offset);
        localStorage.setItem('offset', offset);
        // return Math.abs(window.scrollY - offset) < 10;
    }

    // all_media_urls.forEach(function(e) {if (e.indexOf('.mp4') > 0) {console.log(e);}})
    function download(url) {

        var ajax = new XMLHttpRequest();
        ajax.open('GET', url, true);
        ajax.responseType = 'blob';
        //ajax.setRequestHeader('referer', 'https://home.classdojo.com/');
        //ajax.setRequestHeader('sec-fetch-dest', 'video');
        //ajax.setRequestHeader('sec-fetch-mode', 'no-cors');
        //ajax.setRequestHeader('sec-fetch-site', 'same-site');
        ajax.onload = function (evt) {

            var f = url.split('/');
            f = f[f.length-1];
            var a = document.createElement('a');
            a.href = URL.createObjectURL(evt.target.response);
            a.setAttribute('download', f);
            a.style.display = 'None';
            a.addEventListener('click', function(e){
                e.stopPropagation();
                this.removeEventListener('click', arguments.callee);
            });
            document.body.appendChild(a);
            a.click();
            document.body.removeChild(a);
        };

        ajax.send();
    }

    function get_media_urls() {
        document.getElementsByTagName('div').forEach(function(e) {
            if (e.style.backgroundImage && e.style.backgroundImage.indexOf('url("') >= 0) {
                // console.log(e.style.backgroundImage);
                url = e.style.backgroundImage;
                url = url.split('"');
                if (url.length > 1) {
                    url = url[1].split('?')[0];
                }
                if (url.toLowerCase().indexOf('.jpg') > 0) {
                    if (! window.all_media_urls.has(url)) { 
                        window.all_media_urls.set(url, url);
                        console.log(url);
                        download(url);
                    }
                }
              }
       });

       document.getElementsByTagName('video').forEach(function(vid) {
           vid.children.forEach(function(e) {
               if (e.tagName.toLowerCase() == 'source' && e.src) {
                   if (! window.all_media_urls.has(e.src)) { 
                        window.all_media_urls.set(e.src, e.src);
                        console.log(e.src);
                        download(e.src);
                   }
               }
           });
       });
    }

    window.media_url_list = function() {
        var urls = [];
        window.all_media_urls.forEach(function(k){ urls.push(k);});

        var a = document.createElement('a');
        a.href = URL.createObjectURL(new Blob([urls.join('\n')], {type: "text/plain;charset=utf-8;"}));
        a.setAttribute('download', 'media_url_list.txt');
        a.style.display = 'None';
        a.addEventListener('click', function(e){
            e.stopPropagation();
            this.removeEventListener('click', arguments.callee);
        });
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
    }

    function click_pic() {
        var e = document.querySelector('.glyphicon-chevron-right');
        var timeout = page_scroll_delay;
        var to_scroll = false;
        get_media_urls();
        if (e) {
            e.click();
            console.log("clicked!");
            timeout = 1000;
        } else {
            //offset += 800;
            //window.scroll(0, offset);
            scroll_down();
        }
        get_media_urls();
        setTimeout(click_pic, timeout);
    }
    setTimeout(click_pic, page_scroll_delay);
})();