function makeArvadosRequest(arvHost, arvToken, endpoint, params={}) {
  const defaultParams = {
    'method': 'GET',
    'data': null,
    'contentType': 'application/json;charset=utf-8',
    'responseType': 'json',
    'useSsl': true,
    'requireToken': true
  };

  Object.keys(defaultParams).map(k => (params[k] =
    (k in params ? params[k] : defaultParams[k])));
  let { method, data, contentType, responseType, useSsl, requireToken } = params;

  if (!(arvHost && (arvToken || !requireToken)))
    return new Promise((accept, reject) => reject());

  let xhr = new XMLHttpRequest();
  xhr.open(method, (useSsl ? 'https://' : 'http://') + arvHost + endpoint);
  if (arvToken)
    xhr.setRequestHeader('Authorization', 'OAuth2 ' + arvToken);
  if (data !== null)
    xhr.setRequestHeader('Content-Type', contentType);
  xhr.responseType = responseType;

  let res = new Promise((accept, reject) => {
    xhr.onreadystatechange = () => {
      if (xhr.readyState !== 4)
        return;
      if (xhr.status !== 200)
        reject(xhr);
      else
        accept(xhr);
    };
    xhr.send(data);
  });

  return res;
}

export default makeArvadosRequest;