pluralsigth video download

script: pluralsight downloader

/*
DISCLAIMER: this snippet is just for educational purposes. Use at your own risk.
Instructions:
-Step 1: Get a Pluralsight account.
-Step 2: Start the first video of a course.
-Step 3: paste the following code in the console.
Your videos will be downloaded in your current downloads folder.
*/

var video = document.querySelector('video');
var counter = 0;
var currentVideo = '';
var lastVideo = '';
var videoName = '';

async function downloadVideo() {
    console.log('downloading');

    await fetch(currentVideo)
        .then(res => res.blob())
        .then(blob => downloadBlob(blob, `${counter}-${videoName}.mp4`));
}

async function downloadSubtitles() {
    console.log('downloading Subtitles');

    videoId = () => {
        const splitted = currentVideo.split('/');
        const index = splitted.findIndex(word => word === 'resolution') + 1;
        return splitted[index];
    }

    const subtitleUri = `https://app.pluralsight.com/transcript/api/v1/caption/json/${videoId()}/en`;

    encodedSubtitleBlob = await fetch(subtitleUri)
        .then(subtitle => subtitle.json())
        .then(subtitle => {
            return subtitle.map((sub, i) => {
                function time(ms) {
                    return new Date(ms).toISOString().slice(11, -1).replace('.', ',');
                }
                var nextIndex = i + 1 == subtitle.length ? subtitle.length - 1 : i + 1;
                return (i + 1) + "\r\n" + time(sub.displayTimeOffset * 1000) + " --> " + time(subtitle[nextIndex].displayTimeOffset * 1000) + "\r\n" + sub.text;
            }).join("\r\n\r\n")
        })
        .then(endodedSubtitle => {
            var data = encode(endodedSubtitle);

            return new Blob([data], {
                type: 'text/plain'
            });
        })

    downloadBlob(encodedSubtitleBlob, `${counter}-${videoName}.srt`);
}

function downloadBlob(blob, name) {
    var url = window.URL.createObjectURL(blob);
    var a = document.createElement('a');
    a.href = url;
    a.download = name;
    document.body.appendChild(a)
    a.click();
    a.remove();
}

function encode(s) {
    var out = [];
    for (var i = 0; i < s.length; i++) {
        out[i] = s.charCodeAt(i);
    }
    return new Uint8Array(out);
}

function sleep(milliseconds) {
    return new Promise(resolve => setTimeout(resolve, milliseconds))
}

function goToNextVideo() {
    document.querySelector('#next-control').click();
}

async function run() {
    console.log('run');

    await sleep(3 * 1000);
    video = document.querySelector('video');
    currentVideo = video.src;
    videoName = document.querySelector('.title-clip').innerText;

    if (currentVideo !== lastVideo) {
        video.pause();
        await downloadSubtitles();
        await sleep(50 * 1000);
        await downloadVideo();
        await sleep(100 * 1000);
        goToNextVideo();
        lastVideo = currentVideo;
        counter++;

        run();
    } else {
        console.log('finish');
    }

}

run();