pluralsight-course-downloader.js

(function (window) {

    // Script definitions
    var delay = 500, // Delay between each video
        moduleTree = true, // If true, each module will have a separate directory, else, all modules will belong to the same directory
        createCourseDirectory = false, // If true, will download the course in a separate directory
        waitServerTime = true; // If true, will wait the necessary time defined by the server that bots are identified
                               // (One request each 10-30 seconds). If false, the server will block your account after
                               // the download of an average of 3-4 courses

    // Get course structure
    String.prototype.escapeRegExp = function () {
        return this.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
    };
    String.prototype.replaceArray = function (find, replace) {
        var replaceString = this;
        for (var i = 0; i < find.length; i++) {
            replaceString = replaceString.replace(new RegExp(find[i].escapeRegExp(), "g"), replace[i]);
        }
        return replaceString;
    };
    function hasClass(element, cls) {
        return (' ' + element.className + ' ').indexOf(' ' + cls + ' ') > -1;
    }
    var notAllowed = ['<', '>', ':', '"', '/', '\\', '|', '?', '*'],
        allowed = ['', '', ' -', '\'', '-', '-', '-', '', ''],
        fileNameReplace = ['', '', '', '', '', '', '', '', '', '_'],
        vids = [], // Array with all videos
        counter = 0, // Videos counter
        list = document.getElementsByTagName("section");

    var courseName = document.getElementById("course-title").children[0].text;
    var scriptName = courseName.replaceArray(notAllowed.concat(' '), fileNameReplace).toLowerCase();
    courseName = courseName.replaceArray(notAllowed, allowed);
    for (var i = 0; i < list.length; i++) {
        if (list[i].className.match(/\bmodule\b/)) {
            var li_list = list[i].getElementsByClassName('clips')[0].getElementsByClassName('title');
            var module = list[i].getElementsByTagName("h2")[0].innerText.replaceArray(notAllowed, allowed);
            if (li_list.length > 0) {
                for (var y = 0; y < li_list.length; y++) {
                    counter++;
                    vids.push({
                        "id": counter,
                        "module": i + ' - ' + module,
                        "name": (counter + ' - ' + ((moduleTree === true) ? '' : (module + ' - ')) + li_list[y].innerText).replaceArray(notAllowed, allowed),
                        "link": null
                    });
                }
            }
        }
    }

    function pauseVideo() {
        if (delay >= 5000) {
            window.setTimeout(function() {
                document.getElementById("play-control").click();
            }, 2000);
        }
    }

    // Get video links
    // if (waitServerTime === true) {
    //     delay = 31000;
    // }
    var estimatedTime = ((counter * delay) / 1000);
    if (estimatedTime > 60) {
        estimatedTime = (estimatedTime / 60).toFixed(2) + ' minutes';
    } else {
        estimatedTime = estimatedTime.toFixed(2) + ' seconds';
    }
    console.info('Starting to gather video links, estimated time left: ' + estimatedTime);
    if (delay >= 5000) {
        pauseVideo();
    }
    var index = 0,
        length = vids.length;
    var gather = window.setInterval(function () {
        if (document.body.contains(document.getElementById('try-again-error'))) { // If an error occurred while loading the video, re-load it
            document.getElementById('video-quality-high').click();
        } else if ((index < length) && ((hasClass(document.getElementById('vjs_video_3'), 'vjs-waiting')) || ((index !== 0) && (vids[index-1]["link"] === document.getElementsByTagName("video")[0].getAttribute("src"))))) { // If the video is still loading, then wait fot ir
            return false;
        } else if (index < length) { // If we haven't finished yet, then process the current video
            console.info("Getting video link " + (index + 1) + " of " + length + " of video \"" + vids[index]["name"] + "\"");
            vids[index]["link"] = document.getElementsByTagName("video")[0].getAttribute("src");
            document.getElementById('next-control').click();
            index++;

            // If the delay is high, pause current video to prevent the next video start before we get the link of the current video
            if (delay >= 5000) {
               pauseVideo();
            }

        } else { // If we have finished processing all videos, then validate the gathering of info, generate the script and download it
            window.clearInterval(gather);
            var status = {
                "status": "success",
                "errors": []
            };
            for (var vid in vids) {
                if (vids[vid]["link"] === "") {
                    status["status"] = "failure";
                    status["errors"].push("Found empty links!");
                }
                for (var vid2 in vids) {
                    if ((vids[vid]["link"] === vids[vid2]["link"]) && (vid !== vid2)) {
                        status["status"] = "failure";
                        status["errors"].push("Found duplicate links! Please, try to increase the delay between each video, which is currently " + (delay / 1000).toFixed(2) + " second" + ((delay > 1000) ? "s" : ""));
                    }
                }
            }
            console.log(vids);
            if (status["status"] !== "success") {
                console.error("Error while processing course!", status);
            } else {

                // Build and download the PowerShell Script
                var data = '', // The PowerShell Script
                    lastModule = '', // Name of the last module
                    currentModule = ''; // Name of the current module
                if (createCourseDirectory === true) {
                    data += 'mkdir ".\\' + courseName + '"\r\n';
                    data += 'cd ".\\' + courseName + '"\r\n';
                }
                for (vid in vids) {
                    if (moduleTree === true) {
                        currentModule = vids[vid]["module"];
                        if (lastModule !== currentModule) {
                            if (lastModule !== '') {
                                data += 'cd ..\r\n';
                            }
                            data += 'mkdir ".\\' + currentModule + '"\r\n';
                            data += 'cd ".\\' + currentModule + '"\r\n';
                        }
                        lastModule = currentModule;
                    }
                    data += 'Invoke-WebRequest "' + vids[vid]["link"] + '" -OutFile "' + vids[vid]["name"] + '.mp4"\r\n';
                    if ((waitServerTime === true) && (parseInt(vid)+1 < vids.length)) {
                        data += 'Start-Sleep -m 31000\r\n';
                    }
                }
                data += '[System.Windows.Forms.MessageBox]::Show("Course successfully downloaded!`n`nScript by: Theone Lucas (theone.luc@gmail.com)","Download finished",[System.Windows.Forms.MessageBoxButtons]::OKCancel,[System.Windows.Forms.MessageBoxIcon]::Asterisk)';
                var
                    blob = new Blob([data], {type: 'text/plain'}),
                    a = document.createElement('a');
                a.download = scriptName + '.ps1';
                a.href = window.URL.createObjectURL(blob);
                a.dataset.downloadurl = ['text/json', a.download, a.href].join(':');
                a.click();
                console.info("Course successfully processed!", vids);
            }
        }
    }, delay);

})(window);