static S uploadFileToFileServer(S pathOrURL) {
  File f = urlToFileOpt(pathOrURL);
  if (f != null)
    ret uploadFileToFileServer(f);
  else if (isURL(pathOrURL)) {
    File tmp = createTempFile();
    afterwards { deleteFile(tmp); }
    loadBinaryPageToFile(pathOrURL, tmp);
    ret uploadFileToFileServer(tmp, pathOrURL);
  } else
    ret uploadFileToFileServer(newFile(pathOrURL));
}

static S uploadFileToFileServer(File f) {
  ret uploadFileToFileServer(f, f.getName());
}

// TODO: optimize
static S uploadFileToFileServer(File f, S name) {
  assertFileExists(f);
  ret uploadFileToFileServer(loadBinaryFile(f), name);
}

static S uploadFileToFileServer(byte[] data, S name) {
  print("Uploading " + l(data) + " bytes (" + quote(name) + ") to file server.");
  S page = postPage("https://botcompany.de/files/upload", "data", bytesToHex(data), "name", name, '_pass, muricaPassword());
  print(page);
  Matcher m = Pattern.compile("/raw/([0-9]+)").matcher(page);
  if (!m.find()) fail("File server said: " + page);
  S url = "https://botcompany.de/files/" + m.group(1);
  infoBox("Uploaded: " + url);
  ret url;
}