Download all assignments from google classroom (student work window)

download_assignments.js

/**
HOW TO USE
1. go to assignment submissions (classwork > click assignment > student work)
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=2

// these ids work on paradigms, methodologies
const studentDiv = "WkZsyc"
const downloadDiv = "maXJsd"
const turnedInDiv = "vzcr8"

const INTERVAL = 5000

function downloadAssignments() {
    getAssignments()
        .filter(currentGroup)
          .map(getAssignmentLink)
          .filter(e => e != null) // submitted assignments that don't have attachment, how tf but it happened
          .map(extractId)
          .map(createDownloadLink)
          .map(downloadAtInterval)
}

function getAssignments() {
    return Array.from(document.getElementsByClassName(studentDiv))
        .filter(e => {
            const turned_in_status = Array.from(e.getElementsByClassName(turnedInDiv))
            return turned_in_status.length > 0 && turned_in_status[0].innerHTML.includes("Turned in")
        })
}

function getAssignmentLink(elem) {
    const linkElement = Array.from(elem.getElementsByClassName(downloadDiv))[1]
    return linkElement ? linkElement.href : null
}
function extractId(driveUrl) {
    const rx = /https:\/\/drive.google.com\/open\?id=(.*)&authuser=?/
    const res = rx.exec(driveUrl)
    return res[1]
}

function createDownloadLink(id) {
    return `https://drive.google.com/a/freeuni.edu.ge/uc?authuser=${auth_user}&id=${id}&export=download`
}


function downloadAtInterval(url, index) {
    setTimeout(function() {
       console.log(`downloading assignment ${index}`)
       window.open(url)
    }, index*INTERVAL);
}

function currentGroup(elem) {
    // TODO
    return true
    // todo filter empty
    // todo use comma delimeter
    const list = studentList.split("\n")
    const nameElem = elem.getElementsByClassName("J33wTc")
    const name = Array.from(nameElem)[0].innerHTML.toLowerCase()
    console.log(name)
    let result = list.find(email => isName(email, name, 0, 1))
    if (! result)
        result = list.find(email => isName(email, name, 1, 0))
    return result
}

function isName(email, name, nameIndex, surnameIndex) {
  const arr = name.split(" ")
  if (arr.length < 2)  return false
  const firstname = arr[nameIndex]
  const surname = arr[surnameIndex]
  const surnamePrefix = email => email.includes(surname.substr(0,3))
  return email[0] == firstname[0] && surnamePrefix(email)
}

downloadAssignments()