I am working on flutter app and using cloud firestore to save all users list after signup. So if any user uninstall the app, i want to write delete cloud function to delete that user details automatically from firestore to avoid push notification or any other updates.
I am using firebase analytics also, so when it fire app_remove event, i need automatically trigger delete cloud function.
Please help me on backend code for this as i am not aware of backend code.
You can leverage auth trigger functions
For example, you can create `authUserDeleted´ function and handle all such actions there.
exports.authUserDeleted = functions
.runWith(runtimeOpts)
.region(regionName)
.auth.user().onDelete(async (user) => {
console.log('deleted user: ' + JSON.stringify(user));
// handle necessary actions for the deleted user
return true;
});
Related
I have a Flutter app integrated with a Firebase Realtime Database.
I want a notification (actually an alarm kind of thing if possible), when an item (lets call it alarm) in the database is set to "true". I always see firebase_messaging plugin for notifications, but I am not sure if I'm supposed to use this plugin despite that my app doesn't have anything to do with messaging.
I am totally new to both Flutter and Firebase, can you tell me how to listen to the database even if the app is not running?
By the way, I am currently building the app for only Android, but I want to build it for IOS too in the future.
Thanks.
You can use/write firebase cloud fucntion. Using firebase cloud function you can watch any document/field and try to write trigger logic like if a field is set to true then this cloud function will throw an notification via firebase messaging.
https://firebase.flutter.dev/docs/functions/overview/
When the user is not actively using the app there is no reliable way to continue to listen to changes in the Firebase Realtime Database. To notify the user of changes to the database in that situation, you'll need to listen for those change on an environment that is always on, and then send a message to the user through Firebase Cloud Messaging.
One environment that is always in is Cloud Functions, which is also part of Firebase, and allows you to run small snippets of JavaScript code on Google's servers in response to things that happen in your Firebase project. The documentation of Cloud Functions for Firebase as example of how to notify the user when something interesting happens in the database:
Developers can use Cloud Functions to keep users engaged and up to date with relevant information about an app. Consider, for example, an app that allows users to follow one another's activities in the app. Each time a user adds themselves as a follower of another user, a write occurs in the Realtime Database. Then this write event could trigger a function to create Firebase Cloud Messaging (FCM) notifications to let the appropriate users know that they have gained new followers.
The function triggers on writes to the Realtime Database path where followers are stored.
The function composes a message to send via FCM.
FCM sends the notification message to the user's device.
To review working code, see Send FCM notifications.
I had in mind to create a cloud function that let a user read some of the user infos of another user under certaine conditions.
For example:
const user1 = ??? // user1 is the current user
const user1Data = await firestore().collection('Users').doc('user1.uid').get()
const user2 = ??? // user2 is the user whith user2.uid == user1Data.partnerUid
const user2Data = await firestore().collection('Users').doc('user2.uid').get()
if (user1Data.partnerEmail == user2.email && user1Data.partnerEmail == user2.email) {
// ...
// the endpoint deliver some of the user2 data to user1.
// ...
}
I have seen the documentation of Cloud functions:
https://firebase.google.com/docs/reference/functions/providers_auth_
I have seen that with the admin API we can call getUser:
admin.auth().getUser(uid)
The difference between functions.auth() and admin.auth() is not clear for me. Can we call admin within cloud functions ?
The difference between functions.auth() and admin.auth() is not clear for me.
When you import functions from firebase-functions, all that gets you is an SDK used for building the definition of functions for deployment. It doesn't do anything else. You can't access user data using functions.
When you import admin from firebase-admin, that gives you access to the Firebase Admin SDK that can actually manage user data in Firebase Authentication. You will want to use this to look up and modify users as needed, and it works just fine when running code in Cloud Functions.
The difference between functions.auth() and admin.auth() is not clear for me. Can we call admin within cloud functions ?
Basically functions.auth(), will let you trigger Cloud Functions in response to the creation and deletion of Firebase user accounts. For example, you could send a welcome email to a user who has just created an account in your app:
exports.sendWelcomeEmail = functions.auth.user().onCreate((user) => {
// ...
});
functions.auth() is from the cloud function package:
// The Cloud Functions for Firebase SDK to create Cloud Functions and setup triggers.
const functions = require('firebase-functions');
Using the above package you can preform firestore, database or auth triggers that will run in response to creating data in the database or creating a new user...
// The Firebase Admin SDK to access Cloud Firestore.
const admin = require('firebase-admin');
admin.initializeApp();
The firebase admin sdk is used to access the database from privileged environments example inside cloud functions.
Check the following links:
https://firebase.google.com/docs/functions/use-cases
https://firebase.google.com/docs/functions/auth-events
https://firebase.google.com/docs/admin/setup
https://firebase.google.com/docs/functions/auth-events
I'm trying to integrate Stripe with Firebase as a backend.
I need to create stripe customer when new user signs up to my app.
for that I wrote 1 cloud function which will execute when new user created by Firebase Auth.
but in that function I'm getting Firebase auth's user.
from that I need to update my collection's document which is created for that user. (I'm storing Auth user's uid in my collection's document).
but somehow Firebase cloud function is not updating it.
Here is my Cloud function for same.
// When a user is created, register them with Stripe
exports.createStripeCustomer = functions.auth.user().onCreate(async (user) => {
const customer = await stripe.customers.create({email: user.email});
return admin.firestore().collection('fl_users').doc(user.uid).set({customer_id: customer.id});
});
I don't know what need to update how. Can you please help me to solve my problem?
I have few authenticate users in the user list. And I want to remove one of them. Firebase documentation suggest me to use this code for remove any user.
admin.auth().deleteUser(id)
.then(function() {
console.log('Successfully deleted user');
})
.catch(function(error) {
console.log('Error deleting user:', error);
});
So I use it in my project like this way. I use firebase.auth instead of admin.auth. so my code is like this.
firebase.auth().deleteUser(id)
.then(function() {
console.log('Successfully deleted user');
})
.catch(function(error) {
console.log('Error deleting user:', error);
});
But it not working. Shows an error like this
deleteUser is not a function
The deleteUser function is defined for the Firebase Admin SDK. It appears that you are using the client-side JavaScript SDK. The Admin SDK needs to run on your web server, whereas the client-side JavaScript SDK would run in the browser.
For an overview on how to delete an individual user (or multiple users), see Delete a user.
Firebase Admin SDK
The Admin SDK lets you interact with Firebase from privileged environments to perform actions like:
Read and write Realtime Database data with full admin privileges.
Programmatically send Firebase Cloud Messaging messages using a simple, alternative approach to the FCM server protocols.
Generate and verify Firebase auth tokens.
Access Google Cloud Platform resources like Cloud Storage buckets and Firestore databases associated with your Firebase projects.
Create your own simplified admin console to do things like look up user data or change a user's email address for authentication.
If you are interested in using the Node.js SDK as a client for end-user access (for example, in a Node.js desktop or IoT application), as opposed to admin access from a privileged environment (like a server), you should instead follow the instructions for setting up the client JavaScript SDK.
Is it possible to trigger a Cloud Function when the user uninstalls the app, so that we can clean up the anonymous user realtime database entry?
You can detect app uninstall for Android as an automatically collected Analytics event called app_remove. Then you could trigger a Cloud Function to run when that event occurs. You would also need to use the Firebase Admin SDK to access the database. Check out some of the Cloud Functions for Firebase GitHub samples to see examples of using Analytics triggers and using the Admin SDK. The function could work something like this:
exports.appUninstall = functions.analytics.event('app_remove').onLog(event => {
const user = event.user; // structure of event was changed
const uid = user.userId; // The user ID set via the setUserId API.
// add code for removing data
});