functions-samples/email-confirmation

Send Confirmation Emails with Firebase Cloud Functions

This template shows how to send a confirmation emails to users who are subscribing/un-subscribing to a newsletter.

Cloud Function Code

See file index.js for the moderation code.

Sending emails is performed using nodemailer a node based Email client with comprehensive EMail server setup. In this sample we're showing how to send email through SMTP using a Gmail account.

The dependencies are listed in package.json.

Sample Database Structure

When a signed-in user subscribes or unsubscribes to the mailing list we change the subscribedToMailingList boolean:

/functions-project-12345
    /users
        /$uid
            subscribedToMailingList: true,
            email: "user@domain.com"

Then the email stored here is used

Trigger rules

The function triggers on changes to /users/$uid and exits if there are no changes to subscribedToMailingList.

Deploy and test

This sample comes with a web-based UI for testing the function. To test it out:

• Create a Firebase Project using the Firebase Developer Console
• Enable Google Provider in the Auth section
• Import and configure Firebase in the index.html where the TODO is located
• Setup your email transport in the functions/index.html where the TODO is located
• Deploy your project using firebase deploy
• Open the app, Sign in using Google Sign-In and subscribe/unsubscribe to the newsletter and you should receive email confirmations