is-same-origin/dist/index.js

Check if two URLs are same origin, for Node and the browser

/** @license is-same-origin v0.0.7
 * Copyright (c) 2018-present, Qingrong Ke <keqingrong1992@gmail.com> (https://keqingrong.github.io/)
 * Released under the MIT license
 */

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global.isSameOrigin = factory());
}(this, (function () { 'use strict';

  /**
   * Check if two URLs are same origin
   * @param {string} a - URL A
   * @param {string} b - URL B
   *
   * See
   * https://html.spec.whatwg.org/multipage/origin.html#same-origin
   * https://nodejs.org/dist/latest/docs/api/url.html
   */
  function isSameOrigin(a, b) {
    var urlA = parseURL(a);
    var urlB = parseURL(b);
    if (!urlA || !urlB) {
      return false;
    }
    if (urlA.origin === urlB.origin) {
      return true;
    }
    if (
      urlA.protocol === urlB.protocol &&
      urlA.hostname === urlB.hostname &&
      urlA.port === urlB.port
    ) {
      return true;
    }
    return false;
  }

  /**
   * Parse the URL string
   * @param {string} s - URL string
   * @returns {URL|null}
   */
  function parseURL(s) {
    var url = null;
    try {
      url = new URL(s);
    } catch (error) {
      console.error(error);
    }
    return url;
  }

  return isSameOrigin;

})));