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@subversivo58 subversivo58/.env
Created Oct 13, 2017

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Simple wrapper to use "googleapis" in Node
HOST=mehost.com
APP_MAIL="Site Name" <memail@mehost.com>
GMAIL_APITOKEN={JSON API TOKEN}
GMAIL_APISECRET={JSON API SECRET}
/**
* @licence The MIT License (MIT)
* @copyright Copyright (C) 2017 Lauro Moraes [https://subversivo58.github.com/]
*/
const google = require('googleapis')
const googleAuth = require('google-auth-library')
const gmail = google.gmail('v1')
/**
* Create RAW email content. Gmail API requires compatible RFC 2822 MIME and encoded as base64 strings
* Gmail API reference @see{https://developers.google.com/gmail/api/guides/sending#creating_messages}
* RFC 2822 @see{https://tools.ietf.org/html/rfc2822}
* @return {string} - base64 encode email
* @api - private
*/
const RAWMAIL = function(to, from, subject, template) {
let content = [
'Content-Type: text/html; charset=\'UTF-8\'\n',
'MIME-Version: 1.0\n',
'Content-Transfer-Encoding: 7bit\n',
'to: ', to, '\n',
'from: ', from, '\n',
'subject: ', subject, '\n\n',
template
].join('')
let encodedMail = new Buffer(content).toString('base64').replace(/\+/g, '-').replace(/\//g, '_')
return encodedMail
}
/**
* Send
* @return Promise
* @api - private
*/
const sendMail = function(opts) {
return new Promise((resolve, reject) => {
let require = {
auth: opts.auth,
userId: 'me',
resource: {
raw: opts.raw
}
}
gmail.users.messages.send(require, (err, response) => {
if ( !!err ) {
reject({
code: 1,
message: err
})
}
resolve(response)
})
})
}
class Gmail {
constructor(opts) {
this.credentials = (!!process.env.GMAIL_APISECRET) ? JSON.parse(process.env.GMAIL_APISECRET) : false
this.token = (!!process.env.GMAIL_APITOKEN) ? JSON.parse(process.env.GMAIL_APITOKEN) : false
if ( !this.credentials || !this.token ) {
this.enabled = false
} else {
this.enabled = true
}
}
/**
* Send function
* @return Promise
* @api - public
*/
send(opts) {
return new Promise((resolve, reject) => {
if ( !!this.enabled ) {
//
if ( !opts.to || !opts.template || !opts.subject ) {
reject({
code: 0,
message: 'No have one or more properties "to" (email target), "template" or "subject"'
})
} else {
// define OAuth2
let auth = new googleAuth()
let oauth2Client = new auth.OAuth2(
this.credentials.installed.client_id,
this.credentials.installed.client_secret,
this.credentials.installed.redirect_uris[0]
)
oauth2Client.credentials = this.token
// define sender (fallback to host)
let sender = (!!opts.from) ? opts.from : (!!process.env.APP_MAIL) ? process.env.APP_MAIL : process.env.HOST
// make email
let raw = RAWMAIL(
opts.to,
sender,
opts.subject,
opts.template // with body HTML content
)
sendMail({
auth: oauth2Client,
raw: raw
}).then((response) => {
resolve(response)
}).catch((e) => {
reject(e)
})
}
} else {
reject({
code: 0,
message: 'No have "Gmail API Credentials"'
})
}
})
}
}
module.exports = new Gmail()
Gmail.send({
to: 'your_email_target@domain.com',
subject: 'Awesome subject',
template: '<h1>Exmple of HTML</h1>'
}).then((response) => {
//...
}).catch((e) => {
//...
})
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