zeronet-common/src/network/ip2multi.js

Common ZeroNet modules

'use strict'

const ip = require('ip')
const assert = require('assert')

function ip2multi (ip, proto) {
  ip = ip2multi.split(ip)
  return '/ip' + ip.v + '/' + ip.ip + '/' + (proto || 'tcp') + '/' + ip.port
}

ip2multi.split = ipHost => {
  let s = ipHost.split(':')
  s = [s.pop(), s.join(':')].reverse()
  assert.equal(s.length, 2, 'not host:port')
  let r = {
    ip: s[0],
    port: parseInt(s[1], 10)
  }
  assert(!isNaN(r.port), 'not a valid port')
  assert(ip.isV4Format(r.ip) || ip.isV6Format(r.ip), 'not a valid ip')
  if (ip.isV4Format(r.ip)) r.v = 4
  else if (ip.isV6Format(r.ip)) r.v = 6

  return r
}

ip2multi.isIp = ipHost => {
  try {
    ip2multi.split(ipHost)
    return true
  } catch (e) {
    return false
  }
}

ip2multi.reverse4 = multi => multi.split('/').slice(2).filter(a => a !== 'tcp').join(':')

module.exports = ip2multi