notify-send-authenticate-text-msg.js

import crypto from 'crypto'
import {t} from '@lingui/macro'

const {CIPHER_KEY, NOTIFICATION_AUTHENTICATE_TEXT_ID} = process.env

export const sendAuthTextMsg = ({notifyClient, i18n}) => async ({user}) => {
  const templateId = NOTIFICATION_AUTHENTICATE_TEXT_ID

  const {iv, tag, phoneNumber: encryptedData} = user.phoneDetails
  const decipher = crypto.createDecipheriv(
    'aes-256-ccm',
    String(CIPHER_KEY),
    Buffer.from(iv, 'hex'),
    {authTagLength: 16},
  )
  decipher.setAuthTag(Buffer.from(tag, 'hex'))
  let phoneNumber = decipher.update(encryptedData, 'hex', 'utf8')
  phoneNumber += decipher.final('utf8')

  try {
    await notifyClient.sendSms(templateId, phoneNumber, {
      personalisation: {
        tfa_code: user.tfaCode,
      },
    })
    return true
  } catch (err) {
    console.error(
      `Error occurred when sending authentication code via text for ${user._key}: ${err}`,
    )
    throw new Error(
      i18n._(t`Unable to send authentication text message. Please try again.`),
    )
  }
}