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✏️ Editing: internet.js

'use strict';
// @ts-check
// ==================================================================================
// internet.js
// ----------------------------------------------------------------------------------
// Description:   System Information - library
//                for Node.js
// Copyright:     (c) 2014 - 2021
// Author:        Sebastian Hildebrandt
// ----------------------------------------------------------------------------------
// License:       MIT
// ==================================================================================
// 12. Internet
// ----------------------------------------------------------------------------------

// const exec = require('child_process').exec;
const util = require('./util');

let _platform = process.platform;

const _linux = (_platform === 'linux');
const _darwin = (_platform === 'darwin');
const _windows = (_platform === 'win32');
const _freebsd = (_platform === 'freebsd');
const _openbsd = (_platform === 'openbsd');
const _netbsd = (_platform === 'netbsd');
const _sunos = (_platform === 'sunos');

// --------------------------
// check if external site is available

function inetChecksite(url, callback) {

return new Promise((resolve) => {
    process.nextTick(() => {
      let result = {
        url: url,
        ok: false,
        status: 404,
        ms: null
      };
      if (typeof url !== 'string') {
        if (callback) { callback(result); }
        return resolve(result);
      }
      let urlSanitized = '';
      const s = util.sanitizeShellString(url, true);
      for (let i = 0; i <= util.mathMin(s.length, 2000); i++) {
        if (!(s[i] === undefined)) {
          s[i].__proto__.toLowerCase = util.stringToLower;
          const sl = s[i].toLowerCase();
          if (sl && sl[0] && !sl[1] && sl[0].length === 1) {
            urlSanitized = urlSanitized + sl[0];
          }
        }
      }
      result.url = urlSanitized;
      try {
        if (urlSanitized && !util.isPrototypePolluted()) {
          urlSanitized.__proto__.startsWith = util.stringStartWith;
          if (urlSanitized.startsWith('file:') || urlSanitized.startsWith('gopher:') || urlSanitized.startsWith('telnet:') || urlSanitized.startsWith('mailto:') || urlSanitized.startsWith('news:') || urlSanitized.startsWith('nntp:')) {
            if (callback) { callback(result); }
            return resolve(result);
          }
          let t = Date.now();
          if (_linux || _freebsd || _openbsd || _netbsd || _darwin || _sunos) {
            let args = ['-I', '--connect-timeout', '5', '-m', '5'];
            args.push(urlSanitized);
            let cmd = 'curl';
            util.execSafe(cmd, args).then((stdout) => {
              const lines = stdout.split('\n');
              let statusCode = lines[0] && lines[0].indexOf(' ') >= 0 ? parseInt(lines[0].split(' ')[1], 10) : 404;
              result.status = statusCode || 404;
              result.ok = (statusCode === 200 || statusCode === 301 || statusCode === 302 || statusCode === 304);
              result.ms = (result.ok ? Date.now() - t : null);
              if (callback) { callback(result); }
              resolve(result);
            });
          }
          if (_windows) {   // if this is stable, this can be used for all OS types
            const http = (urlSanitized.startsWith('https:') ? require('https') : require('http'));
            try {
              http.get(urlSanitized, (res) => {
                const statusCode = res.statusCode;

result.status = statusCode || 404;
                result.ok = (statusCode === 200 || statusCode === 301 || statusCode === 302 || statusCode === 304);

if (statusCode !== 200) {
                  res.resume();
                  result.ms = (result.ok ? Date.now() - t : null);
                  if (callback) { callback(result); }
                  resolve(result);
                } else {
                  res.on('data', () => { });
                  res.on('end', () => {
                    result.ms = (result.ok ? Date.now() - t : null);
                    if (callback) { callback(result); }
                    resolve(result);
                  });
                }
              }).on('error', () => {
                if (callback) { callback(result); }
                resolve(result);
              });
            } catch (err) {
              if (callback) { callback(result); }
              resolve(result);
            }
          }
        } else {
          if (callback) { callback(result); }
          resolve(result);
        }
      } catch (err) {
        if (callback) { callback(result); }
        resolve(result);
      }
    });
  });
}

exports.inetChecksite = inetChecksite;

// --------------------------
// check inet latency

function inetLatency(host, callback) {

// fallback - if only callback is given
  if (util.isFunction(host) && !callback) {
    callback = host;
    host = '';
  }

host = host || '8.8.8.8';

return new Promise((resolve) => {
    process.nextTick(() => {
      if (typeof host !== 'string') {
        if (callback) { callback(null); }
        return resolve(null);
      }
      let hostSanitized = '';
      const s = (util.isPrototypePolluted() ? '8.8.8.8' : util.sanitizeShellString(host, true)).trim();
      for (let i = 0; i <= util.mathMin(s.length, 2000); i++) {
        if (!(s[i] === undefined)) {
          s[i].__proto__.toLowerCase = util.stringToLower;
          const sl = s[i].toLowerCase();
          if (sl && sl[0] && !sl[1]) {
            hostSanitized = hostSanitized + sl[0];
          }
        }
      }
      hostSanitized.__proto__.startsWith = util.stringStartWith;
      if (hostSanitized.startsWith('file:') || hostSanitized.startsWith('gopher:') || hostSanitized.startsWith('telnet:') || hostSanitized.startsWith('mailto:') || hostSanitized.startsWith('news:') || hostSanitized.startsWith('nntp:')) {
        if (callback) { callback(null); }
        return resolve(null);
      }
      let params;
      let filt;
      if (_linux || _freebsd || _openbsd || _netbsd || _darwin) {
        if (_linux) {
          params = ['-c', '2', '-w', '3', hostSanitized];
          filt = 'rtt';
        }
        if (_freebsd || _openbsd || _netbsd) {
          params = ['-c', '2', '-t', '3', hostSanitized];
          filt = 'round-trip';
        }
        if (_darwin) {
          params = ['-c2', '-t3', hostSanitized];
          filt = 'avg';
        }
        util.execSafe('ping', params).then((stdout) => {
          let result = null;
          if (stdout) {
            const lines = stdout.split('\n').filter(line => line.indexOf(filt) >= 0).join('\n');

exports.inetLatency = inetLatency;

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