wix-style-react/dist/es/src/utils/UrlUtils.js

wix-style-react

/**
 * RegExps.
 * A URL must match #1 and then at least one of #2/#3.
 * Use two levels of REs to avoid REDOS.
 */
var protocolAndDomainRE = /^(?:\w+:)?\/\/(\S+)$/;
var protocolRE = /^https?:\/\/.+$/i;
var localhostDomainRE = /^localhost[\:?\d]*(?:[^\:?\d]\S*)?$/;
var nonLocalhostDomainRE = /^[^\s\.]+\.\S{2,}$/;
/**
 * Loosely validate a URL `string`.
 *
 * @param {String} string
 * @return {Boolean}
 */

export function isUrl(string) {
  if (typeof string !== 'string') {
    return false;
  }

  var match = string.match(protocolAndDomainRE);

  if (!match) {
    return false;
  }

  var everythingAfterProtocol = match[1];

  if (!everythingAfterProtocol) {
    return false;
  }

  return localhostDomainRE.test(everythingAfterProtocol) || nonLocalhostDomainRE.test(everythingAfterProtocol);
}
/**
 * Prepend `http://` to relative url.
 *
 * @param {String} url
 * @return {String}
 */

export var prependHTTP = function prependHTTP(url) {
  return url && (protocolRE.test(url) ? url : "http://".concat(url));
};