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Filename : pubsuffix-psl.js
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/*!
 * Copyright (c) 2018, Salesforce.com, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of Salesforce.com nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
"use strict";
const psl = require("psl");

// RFC 6761
const SPECIAL_USE_DOMAINS = [
  "local",
  "example",
  "invalid",
  "localhost",
  "test"
];

const SPECIAL_TREATMENT_DOMAINS = ["localhost", "invalid"];

function getPublicSuffix(domain, options = {}) {
  const domainParts = domain.split(".");
  const topLevelDomain = domainParts[domainParts.length - 1];
  const allowSpecialUseDomain = !!options.allowSpecialUseDomain;
  const ignoreError = !!options.ignoreError;

  if (allowSpecialUseDomain && SPECIAL_USE_DOMAINS.includes(topLevelDomain)) {
    if (domainParts.length > 1) {
      const secondLevelDomain = domainParts[domainParts.length - 2];
      // In aforementioned example, the eTLD/pubSuf will be apple.localhost
      return `${secondLevelDomain}.${topLevelDomain}`;
    } else if (SPECIAL_TREATMENT_DOMAINS.includes(topLevelDomain)) {
      // For a single word special use domain, e.g. 'localhost' or 'invalid', per RFC 6761,
      // "Application software MAY recognize {localhost/invalid} names as special, or
      // MAY pass them to name resolution APIs as they would for other domain names."
      return `${topLevelDomain}`;
    }
  }

  if (!ignoreError && SPECIAL_USE_DOMAINS.includes(topLevelDomain)) {
    throw new Error(
      `Cookie has domain set to the public suffix "${topLevelDomain}" which is a special use domain. To allow this, configure your CookieJar with {allowSpecialUseDomain:true, rejectPublicSuffixes: false}.`
    );
  }

  return psl.get(domain);
}

exports.getPublicSuffix = getPublicSuffix;