Updates a DNS record via Gandi's API

index.js

#!/usr/bin/env node

const fetch = require('node-fetch')
const ip = require('ip')
const os = require('os')

const env = require('./.env.json')
const endpoint = 'https://dns.api.gandi.net/api/v5/'
const newip = `${ip.address()}`
const domain = env.domain
  .split('.')
  .slice(0, -2)
  .join('.')
const hostname = `${os.hostname()}.${domain}`
const ttl = 300

/**
 * App
 */
doesRecordExist()
  .then(e => (e ? updateRecord() : createRecord()))
  .catch(err => {
    process.stderr.write(err + '\n')
    process.exit(1)
  })

/**
 * Does a specific record exist?
 */
function doesRecordExist() {
  return apiGetZoneRecords().then(res => {
    return !!res.find(
      record => record.rrset_name === hostname && record.rrset_type === 'A'
    )
  })
}

/**
 * Create new record for hostname
 */
function createRecord() {
  const data = {
    rrset_ttl: ttl,
    rrset_values: [newip]
  }
  return apiAddZoneRecord(hostname, 'A', data)
}

/**
 * Update existing record with new IP
 */
function updateRecord(domain) {
  const data = {
    rrset_ttl: ttl,
    rrset_values: [newip]
  }
  return apiUpdateZoneRecord(hostname, 'A', data)
}

/**
 * API: list all records for a zone
 */
function apiGetZoneRecords() {
  const url = `${endpoint}zones/${env.zoneid}/records`
  return fetch(url, {
    method: 'GET',
    headers: {
      'X-Api-Key': env.apikey
    }
  }).then(res => res.json())
}

/**
 * API: add a new zone record
 */
function apiAddZoneRecord(name, t, data) {
  const url = `${endpoint}zones/${env.zoneid}/records/${name}/${t}`
  return fetch(url, {
    method: 'POST',
    headers: {
      'X-Api-Key': env.apikey,
      'Content-Type': 'application/json; charset=utf-8'
    },
    body: JSON.stringify(data)
  }).then(res => res.json())
}

/**
 * API: update a single zone record
 */
function apiUpdateZoneRecord(name, t, data) {
  const url = `${endpoint}zones/${env.zoneid}/records/${name}/${t}`
  return fetch(url, {
    method: 'PUT',
    headers: {
      'X-Api-Key': env.apikey,
      'Content-Type': 'application/json; charset=utf-8'
    },
    body: JSON.stringify(data)
  }).then(res => res.json())
}

package.json

{
  "name": "gandi-update-dns-record",
  "version": "1.0.0",
  "description": "",
  "main": "gandi-update-dns-record.js",
  "repository": {
    "type": "git",
    "url": "git+https://gist.github.com/842ce03721d474a61d3f68036486d568.git"
  },
  "author": "Bran van der Meer <bran.van.der.meer@protonmail.com>",
  "license": "MIT",
  "homepage": "https://gist.github.com/842ce03721d474a61d3f68036486d568",
  "dependencies": {
    "ip": "^1.1.5",
    "node-fetch": "^2.2.0"
  }
}