I setup a Twitch OAuth integration using the Instagram example, now I can login into my app by opening the popup.html page that the example gave me.
Here's my adapted code:
'use strict';
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const cookieParser = require('cookie-parser');
const crypto = require('crypto');
const { AuthorizationCode } = require('simple-oauth2');
const fetch = require('node-fetch');
// Firebase Setup
const admin = require('firebase-admin');
// #ts-ignore
const serviceAccount = require('./service-account.json');
admin.initializeApp({
credential: admin.credential.cert(serviceAccount),
databaseURL: `https://${process.env.GCLOUD_PROJECT}.firebaseio.com`,
});
const OAUTH_REDIRECT_URI = `https://${process.env.GCLOUD_PROJECT}.firebaseapp.com/popup.html`;;
const OAUTH_SCOPES = 'user:read:email';
/**
* Creates a configured simple-oauth2 client for Twitch.
*/
function twitchOAuth2Client() {
// Twitch OAuth 2 setup
// TODO: Configure the `twitch.client_id` and `twitch.client_secret` Google Cloud environment variables.
const credentials = {
client: {
id: functions.config().twitch.client_id,
secret: functions.config().twitch.client_secret,
},
auth: {
tokenHost: 'https://id.twitch.tv',
tokenPath: '/oauth2/token',
authorizePath: '/oauth2/authorize',
},
options: {
bodyFormat: 'json',
authorizationMethod: 'body',
},
};
return new AuthorizationCode(credentials);
}
/**
* Redirects the User to the Twitch authentication consent screen. Also the 'state' cookie is set for later state
* verification.
*/
exports.redirect = functions.https.onRequest((req, res) => {
const authorizationCode = twitchOAuth2Client();
cookieParser()(req, res, () => {
const state = req.cookies.__session || crypto.randomBytes(20).toString('hex');
console.log('Setting verification state:', state);
res.cookie('__session', state.toString(), { maxAge: 3600000, httpOnly: true });
const redirectUri = authorizationCode.authorizeURL({
redirect_uri: OAUTH_REDIRECT_URI,
scope: OAUTH_SCOPES,
state: state,
});
console.log('Redirecting to:', redirectUri);
res.redirect(redirectUri);
});
});
/**
* Exchanges a given Twitch auth code passed in the 'code' URL query parameter for a Firebase auth token.
* The request also needs to specify a 'state' query parameter which will be checked against the 'state' cookie.
* The Firebase custom auth token, display name, photo URL and Twitch acces token are sent back in a JSONP callback
* function with function name defined by the 'callback' query parameter.
*/
exports.token = functions.https.onRequest((req, res) => {
const authorizationCode = twitchOAuth2Client();
try {
cookieParser()(req, res, async () => {
try {
console.log('Received verification state:', req.cookies.__session);
console.log('Received state:', req.query.state);
if (!req.cookies.__session) {
throw new Error(
'State cookie not set or expired. Maybe you took too long to authorize. Please try again.'
);
} else if (req.cookies.__session !== req.query.state) {
throw new Error('State validation failed');
}
} catch (error) {
return res.jsonp({ error: error.toString() });
}
let accessToken;
try {
console.log('Received auth code:', req.query.code);
const options = {
client_id: functions.config().twitch.client_id,
client_secret: functions.config().twitch.client_secret,
code: req.query.code,
grant_type: 'authorization_code',
redirect_uri: OAUTH_REDIRECT_URI,
};
console.log('Asking token with options', JSON.stringify(options));
accessToken = await authorizationCode.getToken(options);
console.log('Auth code exchange result received');
const twitchUser = await getTwitchUser(accessToken.toJSON().access_token);
// Create a Firebase account and get the Custom Auth Token.
const firebaseToken = await createFirebaseAccount(twitchUser);
// Serve an HTML page that signs the user in and updates the user profile.
return res.jsonp({ token: firebaseToken });
} catch (error) {
return res.jsonp({ error: error.toString() });
}
});
} catch (error) {
return res.jsonp({ error: error.toString() });
}
});
/**
* Creates a Firebase account with the given user profile and returns a custom auth token allowing
* signing-in this account.
*
* #returns {Promise<string>} The Firebase custom auth token in a promise.
*/
async function createFirebaseAccount(twitchUser) {
// The UID we'll assign to the user.
const uid = `twitch:${twitchUser.id}`;
// Save the access token to the Firebase Database.
const db = admin.firestore();
const databaseTask = db.collection('users').doc(uid).set(twitchUser);
// Create or update the user account.
const userCreationTask = admin
.auth()
.updateUser(uid, {
displayName: twitchUser['display_name'],
photoURL: twitchUser['profile_image_url'],
email: twitchUser['email'],
})
.catch((error) => {
// If user does not exists we create it.
if (error.code === 'auth/user-not-found') {
return admin.auth().createUser({
uid: uid,
displayName: twitchUser['display_name'],
photoURL: twitchUser['profile_image_url'],
email: twitchUser['email'],
});
}
throw error;
});
// Wait for all async task to complete then generate and return a custom auth token.
await Promise.all([userCreationTask, databaseTask]);
// Create a Firebase custom auth token.
const token = await admin.auth().createCustomToken(uid);
console.log('Created Custom token for UID "', uid, '" Token:', token);
return token;
}
async function getTwitchUser(accessToken) {
console.log('Fetching Twitch user with access_token', accessToken);
try {
const response = await fetch('https://api.twitch.tv/helix/users', {
method: 'GET',
headers: {
'Client-Id': functions.config().twitch.client_id,
Authorization: 'Bearer ' + accessToken,
},
});
const data = await response.json();
return { ...data.data[0], access_token: accessToken };
} catch (error) {
console.error(error);
}
}
I'd like, though, to login into Twitch using the firebase.auth().signInWithRedirect() method that I already use for Facebook and Google, unfortunately I can't find any documentation about this, and the Facebook provider source code refers to some externs.* resources so I'm not sure how to adapt it for my own needs.
Right now I have two endpoints/cloud functions: _twitchRedirect and _twitchToken, what should I do to integrate them with signInWithRedirect?
I was similarly curious, so spent a little time playing around with things today.
In short, when using Firebase Auth, I believe the providerId will need to be one of the existing supported providers.
If you upgrade to using the Google Cloud Identity Platform though, I believe you will be able to configure custom providers, and then use this function to authenticate:
https://cloud.google.com/identity-platform
We can see that firebase.auth.OAuthProvider and firebase.auth().signInWithPopup (or firebase.auth().signInWithRedirect) are used with a number of the providers here, eg.
https://cloud.google.com/identity-platform/docs/web/apple
https://cloud.google.com/identity-platform/docs/web/microsoft
In addition to these provider choices that we get with the standard Firebase Auth, Google Cloud Identity Platform allows us to also add SAML and OpenID Connect (OIDC) integrations:
https://cloud.google.com/identity-platform/docs/web/saml
https://cloud.google.com/identity-platform/docs/web/oidc
When adding a new identity provider using either of these, we are able to specify the 'Provider ID' to use (prefixed with either saml. or oidc.). This custom provider ID is then used with firebase.auth.OAuthProvider and firebase.auth().signInWithPopup (or firebase.auth().signInWithRedirect) as described above.
For example, if I created a new identity provider with an ID of oidc.foo, my integration code would end up looking like:
const provider = new firebase.auth.OAuthProvider('oidc.foo');
firebase.auth().signInWithPopup(provider)
.then((result) => {
// result.credential is a firebase.auth.OAuthCredential object.
// result.credential.providerId is equal to 'oidc.foo'.
// result.credential.idToken is the OIDC provider's ID token.
})
.catch((error) => {
// Handle error.
});
Based on my understanding of this, I believe we will only currently be able to add custom providers this way if they conform to the OpenID Connect (OIDC) standard (including the OIDC Discovery part, which uses a /.well-known/openid-configuration URL):
Note: If your OIDC provider doesn't comply with the OIDC specification for discovery, it won't work with Identity Platform.
So to my knowledge, the best way to implement 'normal' OAuth2 providers currently is the custom backend function flow you used above (based on the Firebase Auth examples).
As part of figuring this out, I decided to see what would happen if I used a provider ID that didn't match anything configured in my account (this is a fairly verbose step by step, and the main answer is already included above, but this may help provide some more context/help someone out, so including it here)
var provider = new firebase.auth.OAuthProvider("foo.example.com");
firebase
.auth()
.signInWithRedirect(provider)
.then((result) => console.log("OAuthProvider:", result))
.catch((error) => console.log("OAuthProvider::error:", error));
firebase
.auth()
.getRedirectResult()
.then((result) => console.log("RedirectResult:", result))
.catch((error) => console.log("RedirectResult::error:", error));
At first I go this auth/auth-domain-config-required error:
OAuthProvider::error: {
"code": "auth/auth-domain-config-required",
"message": "Be sure to include authDomain when calling firebase.initializeApp(), by following the instructions in the Firebase console."
}
I figured maybe this should be set to the OAuth provider I was wanting to login to, so I set authDomain in my firebase config to foo.myauthprovider.com, but when I called signInWithRedirect, it tried to load the following URL (where the apiKey is the API key of my firebase project), which failed to load:
https://foo.myauthprovider.com/__/auth/handler?apiKey=REDACTED&appName=%5BDEFAULT%5D&authType=signInViaRedirect&providerId=foo.example.com&redirectUrl=http%3A%2F%2Flocalhost%3A3000%2F&v=7.14.5
This /__/auth/handler URL is part of Firebase Auth's reserved URLs, which you can read more about at:
https://firebase.google.com/docs/hosting/reserved-urls#auth_helpers
And is explained a little better in this StackOverflow answer, but is basically what Firebase Auth uses to handle OAuth callbacks to avoid needing to expose sensitive credentials on the frontend, and so users don't need to implement their own handlers all the time):
Why does Firebase auth uses a "middleware" redirect before returning to my app?
Changing authDomain to the actual custom domain of my firebase project fixed that issue, and then resulted in the following auth/operation-not-allowed error when I tried to redirect:
RedirectResult::error: u {code: "auth/operation-not-allowed", message: "The identity provider configuration is not found.", a: null}
I working with firebase auth and I'm a bit confused on how to manage the authentication between different apps, in particular nextjs (main site, that use express too) api and react app (is a kind of dashboard). After reading a bit of documentation what I did (but I'm not sure is the right way) is to get the idToken on the main site with the client side library:
firebase
.auth()
.signInWithEmailAndPassword(email, password)
.then(() => {
const currentUser = firebase.auth().currentUser.getIdToken();
currentUser.then(idToken => {
return axios.post("/auth/login", { idToken });
});
});
and make a request to nextjs/express to create the cookie sessions:
firebase
.auth()
.createSessionCookie(idToken, { expiresIn })
.then(
sessionCookie => {
res.cookie("session", sessionCookie, {
maxAge: expiresIn,
httpOnly: true
});
return res.end(JSON.stringify({ status: "success" }));
},
error => res.status(401).send(error)
);
then when I need to send a request to the api I'll pass the idtoken saved in the cookie and I verify the token in a middleware
const userInfo = await firebase.auth().verifySessionCookie(authToken);
I'm not implemented the react app yet but I think in that I'll just use the clientside library to do everything....My main doubt is the authentication between the nextjs/express and the api, I'm not sure if usin the sessioncookie is the right choise...do I need to send just the tokenId instead of the session cookie? do you have any suggestions?
I am creating an ASP.NET Core MVC app, where the authentication provider will be FireBase.
My Web App is hosted in Azure and, once user signs in, it sends an HTTPS request to my firebase endpoint, which looks like https://myFirebaseApp.cloudfunctions.net/signup with username and password, and it will create a user as below;
https://firebase.google.com/docs/auth/web/start?authuser=0
firebase.auth().createUserWithEmailAndPassword(email, password).catch(function(error) {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
// ...
});
My intention is to get a kind of session token in the response and save it in a cookie. And everytime user navigates to another page, I will need to validate that cookie/token to keep authentication persistent.
What would be the way to achieve this? Or is there any better practice to keep this integration?
I found out I can use custom tokens for this. What I need to use is createCustomToken and
signInWithCustomToken methods.
https://firebase.google.com/docs/auth/admin/create-custom-tokens
Create Token:
createCustomToken(request, response) {
let uid = request.query.uid;
if (!uid) {
response.send("query.uid is required.");
return;
}
let additionalClaims = {
myExtraField: 1
};
this.admin
.auth()
.createCustomToken(uid, additionalClaims)
.then(function(customToken) {
// Send token back to client
response.send(customToken);
})
.catch(function(error) {
response.send(error);
});
}
Sign-in:
signInWithCustomToken(request, response) {
const id_token = request.query.id_token;
if (!id_token) {
response.send("query.id_token is required.");
return;
}
// Sign in with signInWithCustomToken.
this.authService
.signInWithCustomToken(id_token)
.then(result => {
response.send(result);
})
.catch(error => {
response.send(error);
});
}
Is it possible to combine Google Identity (GoogleYOLO) with the Firebase Authentication web stack? If so, how? Thanks!
You can sign in with googleyolo using Firebase Auth as follows:
hintPromise.then((credential) => {
if (credential.idToken) {
// Initialize firebase Auth credential with Google ID token
// obtained from googleyolo.
const cred = firebase.auth.GoogleAuthProvider.credential(credential.idToken);
// Sign in with
return firebase.auth().signInWithCredential(cred);
}
throw new Error;
}).then((result) => {
// User signed in.
}).catch((error) => {
// Handle error.
});
Building on #bojeil's reply, the ID token required by Firebase's signInWithCredential function exists within the credential property of the credential object. Therefore, rather than retrieving the token using credential.idToken, you must retrieve the token with credential.credential. Here is a sample function below using Firebase V8.
// firebase V8
function handleCredentialResponse(credential) {
if (credential) {
const cred = auth.GoogleAuthProvider.credential(credential.credential);
// Sign in with credential from the Google user.
return auth().signInWithCredential(cred);
}
}
The credential param is a credential response returned from the Google one-tap function callback.
google?.accounts.id.initialize({
client_id: your-google-app-client-id.apps.googleusercontent.com,
callback: handleCredentialResponse,
});
google?.accounts.id.prompt((notification) => {
console.log(notification);
});
in my React Native Expo application, I want to authenticate the user with google account. so I followed the Expo Googlefor a normal sign in with google first, Which was working, then using the idToken and accessToken to authenticate with firebase.
signInWithGoogleAsync = async () => {
try {
const result = await Google.logInAsync({androidClientId: ***, iosClientId: ***, scopes: ["profile", "email"] });
if (result.type === "success") { // I get result object
const credential = firebase.auth.GoogleAuthProvider.credential( result.idToken, result.accessToken);
/* credential is and xf {} object */
firebase.auth().signInWithCredential(credential)
.then(user => {console.log( user);})
.catch(error => {console.log(error);});
return result.accessToken;
}
return { cancelled: true };
} catch (e) {
return { error: true };
}
};
but I get the following error:
[Error: {"error":{"errors":[{"domain":"global","reason":"invalid","message":"Invalid Idp Response: the Google id_token is not allowed to be used with this application. Its audience (OAuth 2.0 client ID) is 268165840544-097g31a3qhd0mm.apps.googleusercontent.com, which is not authorized to be used in the project with project_number: 747269174."}],"code":400,"message":"Invalid Idp Response: the Google id_token is not allowed to be used with this application. Its audience (OAuth 2.0 client ID) is 26816581eun236bp9vdb7b6r.apps.googleusercontent.com, which is not authorized to be used in the project with project_number: 747269174."}}]
Add url in error message => eg. your case = 268165840544-097g31a3qhd0mm.apps.googleusercontent.com
under
Authentication > Sign-in Method > Google
Whitelist client IDs from external projects (optional) on Firebase