Personalizing Email Links for Firebase Auth

Improving the Presentation of Firebase Email Links

JavaScript and Firebase Functions

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
const nodemailer = require('nodemailer');
const gmailEmail = functions.config().gmail.email;
const gmailPassword = functions.config().gmail.password;
const mailTransport = nodemailer.createTransport({
  service: 'gmail',
  auth: {
    user: gmailEmail,
    pass: gmailPassword,
  },
});
exports.sendCustomEmail = functions.auth.user().onCreate((user) => {
  const email = user.email; // The email of the user.
  const displayName = user.displayName || 'User';
  const url = `https://PROJECTNAME.firebaseapp.com/__/auth/action?mode=verifyEmail&oobCode=<oobCode>&apiKey=<APIKey>`;
  const mailOptions = {
    from: '"Your App Name" <noreply@yourdomain.com>',
    to: email,
    subject: 'Confirm your email address',
    text: \`Hello ${displayName},\n\nPlease confirm your email address by clicking on the link below.\n\n<a href="${url}">Click here</a>\n\nIf you did not request this, please ignore this email.\n\nThank you!\`
  };
  return mailTransport.sendMail(mailOptions)
    .then(() => console.log('Verification email sent to:', email))
    .catch((error) => console.error('There was an error while sending the email:', error));
});

Server-Side Email Link Customization

Node.js Backend Handling

const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const PORT = process.env.PORT || 3000;
app.use(bodyParser.json());
app.get('/sendVerificationEmail', (req, res) => {
  const userEmail = req.query.email;
  const customUrl = 'https://yourcustomdomain.com/verify?email=' + encodeURIComponent(userEmail);
  // Assuming sendEmailFunction is a predefined function that sends emails
  sendEmailFunction(userEmail, customUrl)
    .then(() => res.status(200).send('Verification email sent.'))
    .catch((error) => res.status(500).send('Error sending email: ' + error.message));
});
app.listen(PORT, () => {
  console.log('Server running on port', PORT);
});

Firebase Email Customization FAQs

1. How do I get the email template settings for Firebase?
2. Go to the Firebase console, choose your project, select Authentication, then templates to view the email template settings.
3. Are HTML and Firebase email templates compatible?
4. It is possible to include unique styles and links in email templates using HTML content supported by Firebase.
5. Can emails using Firebase have dynamic data added to them?
6. Indeed, you may add user-specific information to emails by using placeholders like {displayName} and {email}.
7. How can I test email templates from Firebase before sending them?
8. To preview and test your email templates, Firebase offers a 'Send test email' option in the console.
9. Can many languages be handled by Firebase email templates?
10. Indeed, Firebase facilitates email template localization, enabling you to send emails in several languages according to user preferences.

Concluding Remarks Regarding Email Template Customization

Personalized user experiences are made possible by modifying Firebase email templates, guaranteeing safe and easy application interaction. Developers may greatly improve the security and appearance of emails sent to users by using unique hyperlinks and hiding extraneous URL elements. Enhancing user confidence in the application's authentication procedures and promoting uniformity in branding are two other benefits of this customisation.