Download all classwork from a google classroom topic page

download_classwork.js

/**
HOW TO USE
1. go to classwork topic page ( URL should look like https://classroom.google.com/w/(.*)/tc/(.*) ) 
2. open developer console ( F12 or right click > inspect element > console in top)
3. copy and paste this code, assignments will be downloaded in 5 second intervals

NOTE: CHANGE auth_user IF NECESSARY 
if you are signed in to multiple google accounts, you need to select whichever you use for classroom
(ie freeuni account). If that account is the default one, leave at 0. Otherwise, sign in to gmail with that account
and the number will be displayed in url bar (https://mail.google.com/mail/u/$number), enter that

NOTE files will be downloaded to default download location (~/Downloads)
move all zips/rars from there before launching the script, afterwards you can easily select
newly downloaded files and move elsewhere
*/
const auth_user=0

// these ids work on paradigms, methodologies
const downloadDiv = "maXJsd"

const INTERVAL = 5000

function downloadAllClasswork() {
    Array.from(document.getElementsByClassName(downloadDiv))
        .map(getCourseWorkLink)
        .map(extractId)
        .map(createDownloadLink)
        .map(downloadAtInterval)
}

function getCourseWorkLink(elem) {
    return elem.href
}

function extractId(driveUrl) {
    const rx = /https:\/\/drive.google.com\/file\/d\/(.*)\/view\?usp=drive_web&authuser=?/
    const res = rx.exec(driveUrl)
    return res[1]
}

// See: https://www.labnol.org/internet/direct-links-for-google-drive/28356/
function createDownloadLink(id) {
    return `https://drive.google.com/uc?authuser=${auth_user}&export=download&id=${id}`
}

// See: https://stackoverflow.com/questions/38364400/index-inside-map-function
function downloadAtInterval(url, index) {
    setTimeout(function() {
       console.log(`downloading file ${index}`)
       window.open(url)
    }, index*INTERVAL);
}

downloadAllClasswork()