app.js

'use strict'

const qs = require('querystring')
const config = require('./config/default.json')
const decrypt = require('./src/aws/iam/decrypt')
const sendMessage = require('./src/slack/sendMessage')
const findMessage = require('./src/slack/findMessage')
const deleteMessage = require('./src/slack/deleteMessage')
const getUserInfo = require('./src/slack/getUserInfo')
const sendResponse = require('./src/slack/sendResponse')

const mission = (team, params) =>
  getUserInfo(team['bot-token'])(params.user_id)
  .then((user) => {
    const textParts = params.text.split(' ')
    const defaultDelay = isNaN(textParts[0])
    const waitSeconds = defaultDelay ? 5 : (Math.abs(textParts[0]) > 60 ? 60 : Math.abs(textParts[0]))
    if (!defaultDelay) {
      textParts.shift()
    }
    const messageText = textParts.join(' ')
    return sendMessage(team['bot-token'])(params.channel_id, params.user_name, user.profile.image_48, messageText)
    .then(() => findMessage(team['bot-token'])(params.channel_id, params.user_name, messageText))
    .then((msg) => deleteMessage(team['bot-token'])(params.channel_id, msg.ts, waitSeconds * 1000))
  })

exports.handler = (event, context) => {
  const params = qs.parse(event.body)
  const team = config['teams'].find((t) => t['team-id'] === params.team_id)
  return decrypt(new Buffer(team['encrypted-token'], 'base64'))
  .then((data) => {
    const token = data.Plaintext.toString('ascii')
    const requestToken = params.token
    if (requestToken !== token) {
      console.error(`Request token (${requestToken}) does not match expected`)
      context.succeed('Invalid request token')
    }
    console.log('The params are: ', JSON.stringify(params))
    return mission(team, params)
    .then((data) => sendResponse('Successfully wiped message.'))
    .then(() => context.succeed('Successfully wiped message.'))
  })
  .catch((err) => {
    console.log('Decrypt error:', err)
    context.succeed(err.message || err)
  })
}