function doGet() {
  var lineData = getLineData();
  var imageData = getImageDataFromBlog(lineData);
  saveImageDataToDrive(imageData);
}

function getLineData() {
  // TO DO: implement getting data from line
  return [];
}

function getImageDataFromBlog(lineData) {
  var blogService = new BlogService();
  return blogService.getImageData(lineData);
}

function saveImageDataToDrive(imageData) {
  var driveService = new DriveService();
  driveService.saveImageData(imageData);
}