AWS Lambda function to tweet to use a specified twitter account and tweet the contents of a URL with it

bot.js

const Twitter = require('lwt')
const request = require('request')
//const {promisify, callbackify} = require('util')
const promisify = require('es6-promisify')
const callbackify = require('callbackify')

const tweet = async (twitterSettings, tweetText) => {
  // the following twitter settings are required:
  // {
  //   "accessToken": "...",
  //   "accessSecret": "...",
  //   "consumerKey": "...",
  //   "consumerSecret": "..."
  // }
  const twitter = new Twitter(twitterSettings)

  // promisify twitter.post
  const postTwitterStatus = promisify(twitter.post.bind(twitter))

  // post tweetText on twitter
  const result = await postTwitterStatus('statuses/update', { status: tweetText })
  console.log('tweet result', result)
  if (result.errors && result.errors.length > 0 && result.errors[0].message) {
    throw result.errors[0].message
  }
  return result
}

const tweetEvent = async (event, context) => {
  if (!event.twitter) {
    throw 'Could not handle the event, required property "twitter" is missing'
  }

  // obtain the text to post
  let text
  if (event.text) {
    text = event.text
  } else if (event.request) {
    text = (await promisify(request)(event.request)).body
  } else {
    throw 'Could not handle the event, expected property "text" or "request"'
  }

  // ensure the text is actually a string
  console.log('text:', text)
  if (typeof text !== 'string') {
    throw '"text" is not a string'
  }
  
  // tweet the text
  return await tweet(event.twitter, text)
}

// export both versions of the tweetEvent method
exports.tweetEvent = tweetEvent
exports.tweetEventCallback = callbackify(tweetEvent)