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File Name : index.js

/*eslint no-var:0, prefer-arrow-callback: 0, object-shorthand: 0 */
'use strict';

var Punycode = require('punycode');

var internals = {};

//
// Read rules from file.
//
internals.rules = require('./data/rules.json').map(function (rule) {

return {
    rule: rule,
    suffix: rule.replace(/^(\*\.|\!)/, ''),
    punySuffix: -1,
    wildcard: rule.charAt(0) === '*',
    exception: rule.charAt(0) === '!'
  };
});

//
// Check is given string ends with `suffix`.
//
internals.endsWith = function (str, suffix) {

return str.indexOf(suffix, str.length - suffix.length) !== -1;
};

//
// Find rule for a given domain.
//
internals.findRule = function (domain) {

var punyDomain = Punycode.toASCII(domain);
  return internals.rules.reduce(function (memo, rule) {

if (rule.punySuffix === -1){
      rule.punySuffix = Punycode.toASCII(rule.suffix);
    }
    if (!internals.endsWith(punyDomain, '.' + rule.punySuffix) && punyDomain !== rule.punySuffix) {
      return memo;
    }
    // This has been commented out as it never seems to run. This is because
    // sub tlds always appear after their parents and we never find a shorter
    // match.
    //if (memo) {
    //  var memoSuffix = Punycode.toASCII(memo.suffix);
    //  if (memoSuffix.length >= punySuffix.length) {
    //    return memo;
    //  }
    //}
    return rule;
  }, null);
};

//
// Error codes and messages.
//
exports.errorCodes = {
  DOMAIN_TOO_SHORT: 'Domain name too short.',
  DOMAIN_TOO_LONG: 'Domain name too long. It should be no more than 255 chars.',
  LABEL_STARTS_WITH_DASH: 'Domain name label can not start with a dash.',
  LABEL_ENDS_WITH_DASH: 'Domain name label can not end with a dash.',
  LABEL_TOO_LONG: 'Domain name label should be at most 63 chars long.',
  LABEL_TOO_SHORT: 'Domain name label should be at least 1 character long.',
  LABEL_INVALID_CHARS: 'Domain name label can only contain alphanumeric characters or dashes.'
};

//
// Validate domain name and throw if not valid.
//
// From wikipedia:
//
// Hostnames are composed of series of labels concatenated with dots, as are all
// domain names. Each label must be between 1 and 63 characters long, and the
// entire hostname (including the delimiting dots) has a maximum of 255 chars.
//
// Allowed chars:
//
// * `a-z`
// * `0-9`
// * `-` but not as a starting or ending character
// * `.` as a separator for the textual portions of a domain name
//
// * http://en.wikipedia.org/wiki/Domain_name
// * http://en.wikipedia.org/wiki/Hostname
//
internals.validate = function (input) {

// Before we can validate we need to take care of IDNs with unicode chars.
  var ascii = Punycode.toASCII(input);

if (ascii.length < 1) {
    return 'DOMAIN_TOO_SHORT';
  }
  if (ascii.length > 255) {
    return 'DOMAIN_TOO_LONG';
  }

// Check each part's length and allowed chars.
  var labels = ascii.split('.');
  var label;

for (var i = 0; i < labels.length; ++i) {
    label = labels[i];
    if (!label.length) {
      return 'LABEL_TOO_SHORT';
    }
    if (label.length > 63) {
      return 'LABEL_TOO_LONG';
    }
    if (label.charAt(0) === '-') {
      return 'LABEL_STARTS_WITH_DASH';
    }
    if (label.charAt(label.length - 1) === '-') {
      return 'LABEL_ENDS_WITH_DASH';
    }
    if (!/^[a-z0-9\-]+$/.test(label)) {
      return 'LABEL_INVALID_CHARS';
    }
  }
};

//
// Public API
//

//
// Parse domain.
//
exports.parse = function (input) {

if (typeof input !== 'string') {
    throw new TypeError('Domain name must be a string.');
  }

// Force domain to lowercase.
  var domain = input.slice(0).toLowerCase();

// Handle FQDN.
  // TODO: Simply remove trailing dot?
  if (domain.charAt(domain.length - 1) === '.') {
    domain = domain.slice(0, domain.length - 1);
  }

// Validate and sanitise input.
  var error = internals.validate(domain);
  if (error) {
    return {
      input: input,
      error: {
        message: exports.errorCodes[error],
        code: error
      }
    };
  }

var parsed = {
    input: input,
    tld: null,
    sld: null,
    domain: null,
    subdomain: null,
    listed: false
  };

var domainParts = domain.split('.');

// Non-Internet TLD
  if (domainParts[domainParts.length - 1] === 'local') {
    return parsed;
  }

var handlePunycode = function () {

if (!/xn--/.test(domain)) {
      return parsed;
    }
    if (parsed.domain) {
      parsed.domain = Punycode.toASCII(parsed.domain);
    }
    if (parsed.subdomain) {
      parsed.subdomain = Punycode.toASCII(parsed.subdomain);
    }
    return parsed;
  };

var rule = internals.findRule(domain);

// Unlisted tld.
  if (!rule) {
    if (domainParts.length < 2) {
      return parsed;
    }
    parsed.tld = domainParts.pop();
    parsed.sld = domainParts.pop();
    parsed.domain = [parsed.sld, parsed.tld].join('.');
    if (domainParts.length) {
      parsed.subdomain = domainParts.pop();
    }
    return handlePunycode();
  }

// At this point we know the public suffix is listed.
  parsed.listed = true;

var tldParts = rule.suffix.split('.');
  var privateParts = domainParts.slice(0, domainParts.length - tldParts.length);

if (rule.exception) {
    privateParts.push(tldParts.shift());
  }

parsed.tld = tldParts.join('.');

if (!privateParts.length) {
    return handlePunycode();
  }

if (rule.wildcard) {
    tldParts.unshift(privateParts.pop());
    parsed.tld = tldParts.join('.');
  }

if (!privateParts.length) {
    return handlePunycode();
  }

parsed.sld = privateParts.pop();
  parsed.domain = [parsed.sld,  parsed.tld].join('.');

if (privateParts.length) {
    parsed.subdomain = privateParts.join('.');
  }

return handlePunycode();
};

//
// Get domain.
//
exports.get = function (domain) {

if (!domain) {
    return null;
  }
  return exports.parse(domain).domain || null;
};

//
// Check whether domain belongs to a known public suffix.
//
exports.isValid = function (domain) {

var parsed = exports.parse(domain);
  return Boolean(parsed.domain && parsed.listed);
};

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