Flutter Firebase Notify Admin On New Request - firebase

Question

I am learning flutter /firebase and trying to explore a functionality where I can get an email on a new document created in a specific collection. Is it possible in flutter or firebase?

Answer 1

Yes, you can use Cloud Firestore Triggers. These Triggers are easy to set up with Cloud Functions
The code below is a function that gets triggered when a new document is created inside an example collection of Users. Once triggered, we can extract the user name and email (that comes from the request to create a new user), and use Nodemailer to send a custom email.
{your_email} and {your_password} represent the email account that is sending this email.
const functions = require('firebase-functions');
import * as nodemailer from 'nodemailer';
const transporter = nodemailer.createTransport({
host: 'smtp.gmail.com',
port: 465,
secure: true,
priority: 'high',
auth: {
user: '{your_email}',
pass: '{your_password}',
},
});
export const onCreateUserTrigger = functions.firestore
.document('Users/{userId}')
.onWrite((snap, context) => {
const userEmail = snap.data().email;
// this is the email we send to but you can make this any email:
// userEmail = 'admin#gmail.com';
const userName = snap.data().name;
const userId = context.params.userId;
// send a mail
const htmlText = `<p>Hello ${userName}, </p>
<p> This is a notification about... </p>
`;
const mailOptions = {
from: "{your_name} <{your_email}>",
to: userEmail,
subject: "Notification",
html: htmlText,
};
await transporter.sendMail(mailOptions);
});
If you want a function that gets triggered for any write (create and edit) to the Users collection you can change the firestore function to onWrite:
export const onWriteUserTrigger = functions.firestore
.document('Users/{userId}')
.onWrite((snap, context) => {
// send email
});