node_modules/tough-cookie/lib/permuteDomain.js

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"use strict";
const 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, allowSpecialUseDomain) {
  const pubSuf = pubsuffix.getPublicSuffix(domain, {
    allowSpecialUseDomain: allowSpecialUseDomain
  });

  if (!pubSuf) {
    return null;
  }
  if (pubSuf == domain) {
    return [domain];
  }

  // Nuke trailing dot
  if (domain.slice(-1) == ".") {
    domain = domain.slice(0, -1);
  }

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

exports.permuteDomain = permuteDomain;