I would like to send emails in my React Native using Firebase Cloud Functions. Users should be able to send an email for reporting issues/feedback in the app. I have created a text input and a button in my react native app. The user should be able to specify their issue/feedback in the text input box and when they press the button I will receive their response as an email in my gmail or hotmail account. Can I achieve this using onCreate in Firebase Cloud Functions? If so how can I achieve this? What would the onCreate method look like as well as the button function in react native? I am very new to react native and firebase cloud functions. Unfortunately, I haven't seen any links about this.
Thank you.
Please see below:
const nodemailer = require('nodemailer');
const email = functions.config().email_credentials.email;
const password = functions.config().email_credentials.password;
const mailTransport = nodemailer.createTransport(`smtps://${email}:${password}#smtp.gmail.com`);
functions.database.ref('/feedbacks/{currentId}').onCreate((snapshot, context) => {
const feedback = snapshot.val().feedback;
const name = snapshot.val().name;
const mailOptions = {
from: snapshot.val().email,
replyTo: snapshot.val().email,
to: functions.config().email_credentials.email,
subject: `Feedback from `+name,
html: feedback,
};
try {
mailTransport.sendMail(mailOptions);
} catch(error) {
console.log(error);
}
return null;
});
Realtime database:
Your cloud function could look like this:
import * as functions from "firebase-functions";
import admin from "firebase-admin";
import nodemailer from "nodemailer";
const { email, password } = functions.config().gmail;
const mailTransport = nodemailer.createTransport(
`smtps://${email}:${password}#smtp.gmail.com`
);
export default functions.database
.ref("/feedbacks/{uid}")
.onCreate(async (eventSnapshot, context) => {
const data = eventSnapshot.val();
const { feedback } = data;
const mailOptions = {
from: functions.config().email_credentials.email,
replyTo: functions.config().email_credentials.email,
to: snapshot.val().email,
subject: `Feedback from `+name,
html: feedback,
};
await mailTransport.sendMail(mailOptions);
return null;
});
Make sure to save your email credentials under the firebase cloud function configs and NOT in the code. If you put it anywhere in the code it could potentialy been read by someone in some time. This is very importand.
In your Gmail ensure "Unsercure Apps" are enabled. More about it here.
Now if someon adds some data to the path feeds and email will be send.
Don't forget to deplyo your function with the configs.
Related
I have this multi layered application entirely hosted on GCP. At the moment, we only have the back-end part. Front-end and API are to be developed. For the front-end, the decision has been made - it will be a React.js app hosted on Firebase Hosting and the authentication method will be Email/password and users will be provisioned manually through the Firebase Hosting UI.
As we'd like to have a re-usable middle layer (API) we're in a process of making a decision what type of a solution to be used for our middle layer. The main request here is only logged in users to be able to call the API endpoints. Eventually, there will be also a native/mobile application which will have to also be able to make authenticated requests to the API.
My question here is, what type of GCP service is advised to pick here? I want it to be light, scalable and price optimized. Preferred programming language would be C# but Node.js would be also acceptable.
Firebase Functions would work well for this authenticated API. With a function, you can simply check for the existence of context.auth.uid before proceeding with the API call.
https://firebase.google.com/docs/functions/callable
You'll want to use the .onCall() method to access this context.auth object.
Here's an example I took from one of my active Firebase projects which uses this concept:
Inside your functions>src folder, create a new function doAuthenticatedThing.ts
/**
* A Firebase Function that can be called from your React Firebase client UI
*/
import * as functions from 'firebase-functions';
import { initializeApp } from 'firebase/app';
import { connectFirestoreEmulator, getFirestore, getDocs, query, where, collection } from 'firebase/firestore';
import firebaseConfig from './firebase-config.json';
let isEmulator = false;
const doAuthenticatedThing = functions
.region('us-west1')
.runWith({
enforceAppCheck: true,
memory: '256MB',
})
.https.onCall(async (_data, context) => {
// disable if you don't use app-check verify (you probably should)
if (context.app == undefined) {
throw new functions.https.HttpsError(
'failed-precondition',
'The function must be called from an App Check verified app.',
);
}
// checks for a firebase authenticated frontend user
if (context.auth == undefined) {
throw new functions.https.HttpsError(
'failed-precondition',
'The user must be authenticated.',
);
}
// establish firestore db for queries
const app = initializeApp(firebaseConfig);
const db = getFirestore(app);
// start the emulator
if (process.env.MODE === 'development' && !isEmulator) {
connectFirestoreEmulator(db, '127.0.0.1', 6060);
isEmulator = true;
}
// obtain the user's firebase auth UID
const uuid = context?.auth?.uid as string;
// do some database stuff
const ref = collection(db, 'collection-name');
const q = query(ref, where(uuid, '==', uuid));
const results = await getDocs(q);
if (results.empty) {
throw new functions.https.HttpsError(
'internal',
'There were no results found!',
);
}
// prepare document data
const data: Array<any> = [];
// gather chats, and an array of all chat uids
results.forEach((d) => {
data.push({ id: d.id, data: d.data() });
});
return data;
});
export default doAuthenticatedThing;
Make sure to reference this new Firebase Function in the functions/src/index.ts file.
import doAuthenticatedThingFn from './doAuthenticatedThing';
export const doAuthenticatedThing = doAuthenticatedThingFn;
Create a frontend React Hook so any component can use any function you make. Call it useGetFunction.ts
import { getApp } from 'firebase/app';
import { getFunctions, HttpsCallable, httpsCallable } from '#firebase/functions';
const useGetFunction = (functionName: string): HttpsCallable<unknown, unknown> => {
const app = getApp();
const region = 'us-west1';
const functions = getFunctions(app, region);
return httpsCallable(functions, functionName);
};
export default useGetFunction;
Now you can simply get this function and use it in any React component:
const SomeComponent = () => {
const doAuthenticatedThing = useGetFunction('doAuthenticatedThing');
useEffect(() => {
(async () => {
const results = await doAuthenticatedThing();
})();
}, []);
};
Not sure if anyone has any experience with getstream and react native.
I followed there tutorial to implement getstreams SDK into my existing app and its working great but I'm stuck on tokens. I've successfully set up firebase so when a new user signs up I can see there UID and information over on both firebase auth and getstream but I'm hung up on my frontend getting the user to sign in on the chat with there token. I set up firebase with there extension but still having issues. Works great with dev.tokens but just can't get past this part. Is there any examples out there or better documentation for this? Thank you!
Only documentation I can find.. not specific to react native
https://getstream.io/chat/docs/react/tokens_and_authentication/
This is currently how I initialize my user.. the user token is hard coded in my chat config file.
// useChatClient.js
import { useEffect, useState } from 'react';
import { StreamChat } from 'stream-chat';
import { chatApiKey, chatUserId, chatUserName, chatUserToken } from './chatConfig';
const user = {
id: chatUserId,
name: chatUserName,
};
const chatClient = StreamChat.getInstance(chatApiKey);
export const useChatClient = () => {
const [clientIsReady, setClientIsReady] = useState(false);
useEffect(() => {
const setupClient = async () => {
try {
chatClient.connectUser(user, chatUserToken);
setClientIsReady(true);
// connectUser is an async function. So you can choose to await for it or not depending on your use case (e.g. to show custom loading indicator)
// But in case you need the chat to load from offline storage first then you should render chat components
// immediately after calling `connectUser()`.
// BUT ITS NECESSARY TO CALL connectUser FIRST IN ANY CASE.
} catch (error) {
if (error instanceof Error) {
console.error(`An error occurred while connecting the user: ${error.message}`);
}
}
};
// If the chat client has a value in the field `userID`, a user is already connected
// and we can skip trying to connect the user again.
if (!chatClient.userID) {
setupClient();
}
}, []);
return {
clientIsReady,
};
};
The next step is to request the token from the Firebase cloud function (ext-auth-chat-getStreamUserToken), and then initialise the current user with that token.
There is a guide and video showing how to do this using the Stream Chat Flutter SDK:
https://getstream.io/chat/docs/sdk/flutter/guides/token_generation_with_firebase/
https://youtu.be/Dt_taxX98sg
so I make http trigger function to get all events from my firestore like the image above.
firestore.js
const functions = require('firebase-functions')
const admin = require("firebase-admin")
// initialize database
admin.initializeApp()
const db = admin.firestore();
const settings = {timestampsInSnapshots: true};
db.settings(settings)
const eventRef = db.collection('event')
module.getAllEventsFromFirestore = functions.https.onRequest(async (request,response) => {
try {
const events = await eventRef.get()
response.status(200).send(`number of event is ${event.size}`)
} catch (error) {
response.status(500).send(error)
}
})
and my index.js
const {getAllEventsFromFirestore} = require("./firestore")
after deploying the function, I expect will get the URL to access that http trigger function on my terminal, but I can't find it.
The Firebase CLI will only give you a URL the first time you deploy the function. If you update the function after the first deploy, it won't print the URL. You can get the URL of the function by going to the Firebase console and view your functions there. The URL will be available on the Functions dashboard page.
If you would like to see a change in behavior of the Firebase CLI, file a feature request with Firebase support.
I've a project in which I used to authenticate the users with firebase-auth.In my project users can not create their accounts on their own.Only admin have the privilege to add the user accounts.
In order to use onAuthStateChanged() function I must use firebase-auth in my page.But the issue is because of using firebase-auth on client side one can esaily create accounts by running createUserWithEmailAndPassword() function on the console without having the admin privilege.
Now how can I restrict the people from using createUserWithEmailAndPassword() function on client side?
The only way you can stop clients apps from creating accounts is to disable all authentication providers for your project in the Firebase console. You could write an auth onCreate Cloud Function that attempts to figure out if a new account was created by client or admin code if you want to try to delete it immediately.
I think you can add a claim once the user is added, via a cloud function, which requires authorization, so that if the user doesn't have that claim he can't use the app or can't login.
In 2022 with Firebase Auth with Identity Platform and blocking functions, we can accomplish that the following way:
Create an HTTP function that receives email, password and displayName, and creates user using firebase-admin:
import { https } from 'firebase-functions';
import { getAuth } from 'firebase-admin/auth';
import cors from 'cors';
const auth = getAuth();
// Register an HTTP function with the Functions Framework
export const signupUser = https.onRequest((req, res) => {
const options = {
origin: 'http://localhost:3000'
};
cors(options)(req, res, () => {
console.log('all good');
auth
.createUser({
email: 'example#email.com',
emailVerified: false,
password: 'secretPassword',
displayName: 'John Doe',
disabled: false,
})
.then((userRecord) => {
// See the UserRecord reference doc for the contents of userRecord.
console.log('Successfully created new user:', userRecord.uid);
})
.catch((error) => {
console.log('Error creating new user:', error);
});
// Send an HTTP response
res.send('OK');
});
});
Modify response and origin in CORS as you need.
Now create a blocking beforeCreate function and check for user's display name, if there is no display name, throw an error:
import { auth } from "firebase-functions";
import { initializeApp, applicationDefault } from 'firebase-admin/app';
import { getAuth } from 'firebase-admin/auth';
import postmark from 'postmark';
const app = initializeApp({
credential: applicationDefault(),
projectId: 'your_project_id',
});
const tnc = getAuth(app);
export const signUp = auth
.user().beforeCreate((user, context) => {
if (!user.displayName) {
throw new auth.HttpsError('permission-denied');
}
});
This will work because there is no way to include "display name" when signing up via client side
So you, in short, point is to create a Cloud Function that will register users and make sure to add the check to beforeCreate for something that you know is only possible to do on server-side via firebase-admin sdk.
EDIT: CORRECTION
Just found out you can now disable client side signup from Firebase Console if you have Auth + Identity Platform
I'm working on a chat application and I currently have 6 different chat channels with a different firebase database for each of them. Every channels have firebase rules that define if an user can read and write in this channel. I want to send notifications to users when a new message is posted, but only the users that are part of the specified channel.
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const _ = require('lodash');
admin.initializeApp(functions.config().firebase);
exports.sendNewMessageNotification = functions.database.ref('/GeneralMessage').onWrite(event => {
const getValuePromise = admin.database()
.ref('GeneralMessage')
.orderByKey()
.limitToLast(1)
.once('value');
return getValuePromise.then(snapshot => {
console.log(_.values(snapshot.val())[0]);
const { text } = _.values(snapshot.val())[0];
const payload = {
notification: {
title: 'New msg',
body: text,
}
};
return admin.messaging()
.sendToTopic('GeneralMessage', payload);
});
});
That's the code I currently have using firebase cloud function in /functions/index.js. When I send a message in the app, I have this output in firebase : Firebase cloud functions but the notifications isn't working in app.