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index.js
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index.js
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/**
* Copyright 2015 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
const functions = require('firebase-functions');
const nodemailer = require('nodemailer');
// Configure the email transport using the default SMTP transport and a GMail account.
// For other types of transports such as Sendgrid see https://nodemailer.com/transports/
// TODO: Configure the `gmail.email` and `gmail.password` Google Cloud environment variables.
const gmailEmail = functions.config().gmail.email;
const gmailPassword = functions.config().gmail.password;
const mailTransport = nodemailer.createTransport({
service: 'gmail',
auth: {
user: gmailEmail,
pass: gmailPassword,
},
});
// Sends an email confirmation when a user changes his mailing list subscription.
exports.sendEmailConfirmation = functions.database.ref('/users/{uid}').onWrite((change) => {
const snapshot = change.after;
const val = snapshot.val();
if (!snapshot.changed('subscribedToMailingList')) {
return null;
}
const mailOptions = {
from: '"Spammy Corp." <[email protected]>',
to: val.email,
};
const subscribed = val.subscribedToMailingList;
// Building Email message.
mailOptions.subject = subscribed ? 'Thanks and Welcome!' : 'Sad to see you go :`(';
mailOptions.text = subscribed ?
'Thanks you for subscribing to our newsletter. You will receive our next weekly newsletter.' :
'I hereby confirm that I will stop sending you the newsletter.';
return mailTransport.sendMail(mailOptions)
.then(() => console.log(`New ${subscribed ? '' : 'un'}subscription confirmation email sent to:`,
val.email))
.catch((error) => console.error('There was an error while sending the email:', error));
});