// Licensed to the Software Freedom Conservancy (SFC) under one// or more contributor license agreements.  See the NOTICE file// distributed with this work for additional information// regarding copyright ownership.  The SFC licenses this file// to you under the Apache License, Version 2.0 (the// "License"); you may not use this file except in compliance// with the License.  You may obtain a copy of the License at////   http://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing,// software distributed under the License is distributed on an// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY// KIND, either express or implied.  See the License for the// specific language governing permissions and limitations// under the License.'use strict'const os = require('node:os')function getLoInterface() {  let name  if (process.platform === 'darwin') {    name = 'lo0'  } else if (process.platform === 'linux') {    name = 'lo'  }  return name ? os.networkInterfaces()[name] : null}/** * Queries the system network interfaces for an IP address. * @param {boolean} loopback Whether to find a loopback address. * @param {string} family The IP family (IPv4 or IPv6). Defaults to IPv4. * @return {(string|undefined)} The located IP address or undefined. */function getIPAddress(loopback, family) {  let interfaces  if (loopback) {    const lo = getLoInterface()    interfaces = lo ? [lo] : null  }  interfaces = interfaces || os.networkInterfaces()  for (let key in interfaces) {    if (!Object.prototype.hasOwnProperty.call(interfaces, key)) {      continue    }    for (let ipAddress of interfaces[key]) {      if ((ipAddress.family === family || `IPv${ipAddress.family}` === family) && ipAddress.internal === loopback) {        return ipAddress.address      }    }  }  return undefined}// PUBLIC API/** * Retrieves the external IP address for this host. * @param {string=} family The IP family to retrieve. Defaults to "IPv4". * @return {(string|undefined)} The IP address or undefined if not available. */function getAddress(family = 'IPv4') {  return getIPAddress(false, family)}/** * Retrieves a loopback address for this machine. * @param {string=} family The IP family to retrieve. Defaults to "IPv4". * @return {(string|undefined)} The IP address or undefined if not available. */function getLoopbackAddress(family = 'IPv4') {  return getIPAddress(true, family)}/** * Splits a hostport string, e.g. "www.example.com:80", into its component * parts. * * @param {string} hostport The string to split. * @return {{host: string, port: ?number}} A host and port. If no port is *     present in the argument `hostport`, port is null. */function splitHostAndPort(hostport) {  let lastIndex = hostport.lastIndexOf(':')  if (lastIndex < 0) {    return { host: hostport, port: null }  }  let firstIndex = hostport.indexOf(':')  if (firstIndex != lastIndex && !hostport.includes('[')) {    // Multiple colons but no brackets, so assume the string is an IPv6 address    // with no port (e.g. "1234:5678:9:0:1234:5678:9:0").    return { host: hostport, port: null }  }  let host = hostport.slice(0, lastIndex)  if (host.startsWith('[') && host.endsWith(']')) {    host = host.slice(1, -1)  }  let port = parseInt(hostport.slice(lastIndex + 1), 10)  return { host, port }}// PUBLIC APImodule.exports = {  splitHostAndPort,  getLoopbackAddress,  getAddress,}