Thumbnail download script for a certain platform

downloadThumbnail.js

/**
 * Thumbnail download script for a certain platform
 * @github https://gist.github.com/beetcb/75b511714cec347b9362639e6ff3f923
 */
;(async () => {
  // Prerequisite
  const rightToggle = document.querySelector('.right-panel-toggle')
  if (rightToggle.classList.contains('active')) {
    rightToggle.click()
    await new Promise(res=>setTimeout(2000, res))
  }
  // Pics ready
  const thumbnailURL = document
    .querySelector('#right-panel>div>div>div')
    ?.getAttribute('style')
    ?.match(/url\("(.+)"\)/)?.[1]
  if (thumbnailURL) {
    const response = await fetch(thumbnailURL)
    const blob = await response.blob()
    const u = URL.createObjectURL(blob)

    const a = document.createElement('a')
    a.href = u
    a.download = 'banner.png'
    document.body.appendChild(a)
    a.click()

    URL.revokeObjectURL(u)
  }
})()