Cloudinary REST upload via fetch()

blah.js

function upload_to_cloudinary(uri) {
  let timestamp = (Date.now() / 1000 | 0).toString()
  let hash_string = 'timestamp=' + timestamp + cloudinary_config.api_secret
  let signature = CryptoJS.SHA1(hash_string).toString()
  let upload_url = 'https://api.cloudinary.com/v1_1/' + cloudinary_config.cloud_name + `/video/upload`

  const formdata = new FormData()
  formdata.append('file', {uri, type: 'video/mp4', name: 'upload.mp4'})
  formdata.append('eager', 'c_fill,h_1280,w_720|c_fill,h_853,w_480')
  formdata.append('eager_async', true)
  formdata.append('timestamp', timestamp)
  formdata.append('api_key', cloudinary_config.api_key)
  formdata.append('signature', signature)

  return fetch(upload_url, {
    method: 'POST',
    body: formdata
  })
}