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✏️ Editing: permuteDomain.js

/*!
 * Copyright (c) 2015, 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";
var pubsuffix = require('./pubsuffix-psl');

// Gives the permutation of all possible domainMatch()es of a given domain. The
// array is in shortest-to-longest order.  Handy for indexing.
function permuteDomain (domain) {
  var pubSuf = pubsuffix.getPublicSuffix(domain);
  if (!pubSuf) {
    return null;
  }
  if (pubSuf == domain) {
    return [domain];
  }

var prefix = domain.slice(0, -(pubSuf.length + 1)); // ".example.com"
  var parts = prefix.split('.').reverse();
  var cur = pubSuf;
  var permutations = [cur];
  while (parts.length) {
    cur = parts.shift() + '.' + cur;
    permutations.push(cur);
  }
  return permutations;
}

exports.permuteDomain = permuteDomain;

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