itowns/lib/Parser/MapBoxUrlParser.js

A JS/WebGL framework for 3D geospatial data visualization

const urlRe = /^(\w+):\/\/([^/?]*)(\/[^?]+)?\??(.+)?/;
const config = {
  API_URL: 'https://api.mapbox.com',
  REQUIRE_ACCESS_TOKEN: true,
  ACCESS_TOKEN: null
};
function formatUrl(obj) {
  const params = obj.params.length ? `?${obj.params.join('&')}` : '';
  return `${obj.protocol}://${obj.authority}${obj.path}${params}`;
}
function makeAPIURL(urlObject, accessToken) {
  const apiUrlObject = parseUrl(config.API_URL);
  urlObject.protocol = apiUrlObject.protocol;
  urlObject.authority = apiUrlObject.authority;
  if (urlObject.protocol === 'http') {
    const i = urlObject.params.indexOf('secure');
    if (i >= 0) {
      urlObject.params.splice(i, 1);
    }
  }
  if (apiUrlObject.path !== '/') {
    urlObject.path = `${apiUrlObject.path}${urlObject.path}`;
  }
  if (!config.REQUIRE_ACCESS_TOKEN) {
    return formatUrl(urlObject);
  }
  accessToken = accessToken || config.ACCESS_TOKEN;
  if (!accessToken) {
    throw new Error('An API access token is required');
  }
  if (accessToken[0] === 's') {
    throw new Error('Use a public access token (pk.*), not a secret access token (sk.*).');
  }
  urlObject.params = urlObject.params.filter(d => d.indexOf('access_token') === -1);
  urlObject.params.push(`access_token=${accessToken}`);
  return formatUrl(urlObject);
}
function isMapboxURL(url) {
  return url.indexOf('mapbox:') === 0;
}
function parseUrl(url) {
  const parts = url.match(urlRe);
  if (!parts) {
    throw new Error('Unable to parse URL object');
  }
  return {
    protocol: parts[1],
    authority: parts[2],
    path: parts[3] || '/',
    params: parts[4] ? parts[4].split('&') : []
  };
}
function normalizeSpriteURL(url, format, extension, accessToken) {
  const urlObject = parseUrl(url);
  if (!isMapboxURL(url)) {
    urlObject.path += `${format}${extension}`;
    return formatUrl(urlObject);
  }
  urlObject.path = `/styles/v1${urlObject.path}/sprite${format}${extension}`;
  return makeAPIURL(urlObject, accessToken);
}
function normalizeSourceURL(url, accessToken) {
  if (!isMapboxURL(url)) {
    return url;
  }
  const urlObject = parseUrl(url);
  urlObject.path = `/v4/${urlObject.authority}.json`;
  urlObject.params.push('secure');
  return makeAPIURL(urlObject, accessToken);
}
function normalizeStyleURL(url, accessToken) {
  if (!isMapboxURL(url)) {
    return url;
  }
  const urlObject = parseUrl(url);
  urlObject.path = `/styles/v1${urlObject.path}`;
  return makeAPIURL(urlObject, accessToken);
}
export default {
  normalizeStyleURL,
  normalizeSourceURL,
  normalizeSpriteURL
};