browser-extension-url-match/dist/getHostRegex.js

Browser extension URL pattern matching

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getHostRegex = getHostRegex;
var _fancyRegex = require("fancy-regex");
var _getDummyUrl = require("./getDummyUrl");
function getHostRegex(patternSegments) {
  const {
    pattern,
    scheme,
    rawHost
  } = patternSegments;
  if (!rawHost && scheme !== 'file') {
    return new TypeError('Host is optional only if the scheme is "file".');
  }
  const isStarHost = rawHost.includes('*');
  if (isStarHost) {
    const segments = rawHost.split('*.');
    if (rawHost.length > 1 && (segments.length !== 2 || segments[0] || !segments[1])) {
      return new TypeError('Host can contain only one wildcard at the start, in the form "*.<host segments>"');
    }
  }
  const dummyUrl = (0, _getDummyUrl.getDummyUrl)(patternSegments, {
    subdomain: ''
  });
  if (!dummyUrl) {
    return new TypeError(`Pattern "${pattern}" cannot be used to construct a valid URL.`);
  }
  const dummyHost = dummyUrl.host;
  if (/:\d+$/.test(dummyHost)) {
    return new TypeError(`Host "${rawHost}" cannot include a port number. All ports are matched by default.`);
  }
  if (/[^.a-z0-9\-]/.test(dummyHost)) {
    return new TypeError(`Host "${rawHost}" contains invalid characters.`);
  }
  const host = isStarHost ? '*.' + dummyHost : dummyHost;
  if (rawHost === '*') {
    return /.+/;
  } else if (host.startsWith('*.')) {
    return (0, _fancyRegex.regex)()`
			^
				(?:[^.]+\.)*     # any number of dot-terminated segments
				${host.slice(2)}   # rest after leading *.
			$
		`;
  } else {
    return (0, _fancyRegex.regex)()`^${host}$`;
  }
}