util.js

const READLINE = require('readline');
const URL = require('url');
const FS = require('fs');

exports.mysqlRegex = /^[$a-zA-Z0-9_]+$/;
const hostnameRegex = exports.hostnameRegex = /^@$|^[0-9a-zA-Z]+([-0-9a-zA-Z.][0-9a-zA-Z]+)*$|^([0-9]{1,3}\.){2}[0-9]{1,3}$/; // eslint-disable-line max-len
exports.urlRegex = /https?:\/\/[-a-zA-Z0-9@:%._+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_+.~#?&//=]*)/;
const isBool = exports.isBool = line => ['y', 'n'].includes(line);

exports.existsFile = line => FS.existsSync(line) && FS.statSync(line).isFile();

exports.parseUUIDFormater = line => {
  let parts = line.split('/');
  return {
    regex: parts[1],
    flags: parts[2],
    replacement: parts[3],
  };
};

exports.parseEndpoint = line => {
  const parts = line.split(',');
  return {
    hostname: parts[0],
    allowUnsecure: parts[1] === 'y',
  };
};

exports.isEndpoint = line => {
  const parts = line.split(',');
  if (!isBool(parts[1])) return false;
  if (!parts[0].match(hostnameRegex)) return false;
  return true;
};

const isUInt = exports.isUInt = line => !isNaN(line) && Number(line) > 0 && Number(line) === Math.floor(Number(line));

exports.isUIntList = line => !line.split(',').some(a => !isUInt(a));

exports.isClientLocation = line => {
  const parts = line.split('@');
  if (!parts[0].match(/^[A-Z]+$/)) return false;
  const u = URL.parse(`https://${parts[1]}`);
  if (!u.hostname) return false;
  if (!u.path) return false;
  return true;
};

exports.parseClientLocation = line => {
  const parts = line.split('@');
  const u = URL.parse(`https://${parts[1]}`);
  const a = {
    hostname: u.hostname,
    port: u.port,
    method: parts[0],
    path: u.path,
  };
  if (!a.port) delete a.port;
  if (!a.url || a.url === '/') delete a.url;
  return a;
};

exports.readStdin = (q, validateFN, def) => new Promise(resolve => {
  const rl = READLINE.createInterface(process.stdin, process.stdout);
  rl.setPrompt(`${q}> `);
  rl.prompt();
  if (def !== undefined) rl.write(def);
  rl.on('line', line => {
    if (validateFN(line)) {
      rl.close();
      return resolve(line);
    }
    if (def !== undefined) {
      rl.prompt();
      return rl.write(def);
    } else {
      return rl.prompt();
    }
  });
});