sendgrid-mail/lib/sendmail.js

The easiest way to send mail with sendgrid.

'use strict'

const debug = require('debug')('sendgrid-mail:sendgrid')
const bent = require('bent')
const _ = require('lodash')
const util = require('./util')

const sgPost = bent('POST', 'https://api.sendgrid.com/v3/', 202)
const chattySgPost = async (reqHeaders, reqBody) => {
  debug('calling sendgrid /mail/send api')
  debug(`request headers: ${util.inspect(reqHeaders)}`)
  debug(`request body: ${util.inspect(reqBody)}`)
  try {
    const resp = await sgPost('mail/send', reqBody, reqHeaders)
    const respStatus = resp.statusCode
    const respText = await resp.text()
    debug(`${respStatus} response: ${respText}`)
    return respText
  } catch (error) {
    const errorStatus = error.statusCode
    const errorText = await error.text()
    debug(`error response ${errorStatus}: ${errorText}`)
    debug('re-throwing...')
    throw error
  }
}

const sendMail = async (options = {}) => {
  if (options.suppressEmpty && _.isEmpty(options.body)) {
    throw new Error('Refusing to send mail with empty body when suppressEmpty is true')
  }

  const sgOptions = {
    personalizations: [
      {
        to: options.to,
        cc: options.cc,
        bcc: options.bcc
      }
    ],
    from: options.from,
    reply_to: options.replyTo,
    subject: options.subject,
    content: [
      {
        type: options.contentType || 'text/plain',
        value: options.body
      }
    ]
  }

  sgOptions.personalizations = sgOptions.personalizations.filter(obj => {
    const retVal = Object.assign(obj)
    for (const field of ['to', 'cc', 'bcc']) {
      if (_.isEmpty(retVal[field])) {
        delete retVal[field]
      }
    }

    return retVal
  })

  const sgHeaders = {
    Authorization: `Bearer ${options.apikey}`,
    'Content-Type': 'application/json'
  }

  await chattySgPost(sgHeaders, sgOptions)
}

module.exports = sendMail