// there are random upload errors...
static int uploadToImageServerIfNotThere_tries = 3;

static S uploadToImageServerIfNotThere(BufferedImage img, S name) {
  ret uploadToImageServerIfNotThere(null, img, name);
}

static S uploadToImageServerIfNotThere(File f, BufferedImage img, S name) {
  S md5 = md5OfRGBImage(new RGBImage(img));
  Throwable lastException = null;
  for tries to uploadToImageServerIfNotThere_tries: try {
    long id = imageServerCheckMD5(md5);
    if (id == 0)
      ret uploadToImageServer_new(f, img, name);
    else
      ret snippetImgLink(fsI(id));
  } catch e {
    lastException = printException(e);
  }
  fail(lastException);
}

sS uploadToImageServerIfNotThere(File f) {
  ret uploadToImageServerIfNotThere(f, loadImage2(f), fileName(f));
}