Instagram JS images scraper by tag

index.js

const IMAGES_NUM = 250
let imgSrcs = new Set()

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

function appendImages() {
  var imgs = document.getElementsByTagName("img")

  for (var i = 0; i < imgs.length; i++) {
    imgSrcs.add(imgs[i].src)
  }
}

function autoScroll() {
  if(imgSrcs.size < IMAGES_NUM) {
    window.scrollTo({ top: document.body.scrollHeight, behavior: 'smooth' })
  } else {
    clearInterval(autoScrollInterval)
    downloadImages()
  }
}

function toDataURL(url) {
  return fetch(url).then((response) => {
    return response.blob()
  }).then(blob => {
    return URL.createObjectURL(blob)
  }).catch(err => {
    return false
  })
}

function millisToMinutesAndSeconds(millis) {
  var minutes = Math.floor(millis / 60000);
  var seconds = ((millis % 60000) / 1000).toFixed(0);
  return `${minutes}:${(seconds < 10 ? "0" : "")}${seconds}`;
}

function makeStr(len, char) {
  return Array.prototype.join.call({length: (len || -1) + 1}, char || 'x');
}

async function downloadImages() {
  const imgSrcsArray = Array.from(imgSrcs)
  const imgNumber = imgSrcsArray.length
  const startTime = new Date().getTime()
  
  for (var i = 0; i < imgNumber; i++) {
    const paths = window.location.pathname.split('/')
    const a = document.createElement("a")
    a.href = await toDataURL(imgSrcsArray[i])
    if(a.href != false) {
      a.download = paths[3] + ".jpg"
      document.body.appendChild(a)
      await sleep(100);
      a.click()
      document.body.removeChild(a)
    }
    
    let timestamp = new Date().getTime()
    let ellapsed = timestamp - startTime
    let remaining = imgNumber - i
    let eta = remaining * ellapsed / i
    let progressBar = (length = 20) => {
      let progressRatio = Math.round((i+1) / imgNumber * length)
      let first = makeStr(progressRatio ,'=')
      let end = makeStr(length - progressRatio, ' ')
      return `[${first}>${end}]`
    }
    console.clear()
    console.log(`${i+1} / ${imgNumber} ${progressBar()} ETA: ${millisToMinutesAndSeconds(eta)}s`)
  }
}

var isScrolling;
window.addEventListener('scroll', () => {
  window.clearTimeout( isScrolling )
  isScrolling = setTimeout(function() {
    appendImages()
    console.log(imgSrcs.size)
  }, 66)
}, false)

autoScrollInterval = setInterval(autoScroll, 1500)