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login with mails added to checklist -javascript

Have a realtime db login auth rules.
When I enter the mails manually, the mails I authorize gain access, there is no problem. Here is code:
{
"rules": {
".read": "
auth.token.email == \"xx#qq.co\"
|| auth.token.email == \"yy.yy#yy.co\"
|| auth.token.email == \"ss#ss.com\"
",
".write": true
}
}
But my idea:
{"emails":{"xx#hotmail.com", "qq#gmail.com"},
{
"rules": {
".read": "auth.token.email == emails",
".write": true
}
and realtime db code screenshot:
any idea this issue?

That second snippet looks like invalid syntax for Firebase security rules, and thus won't work (it actually shouldn't even save when you enter that in the Firebase console).
If you want a dynamic list of user to gain access, the idiomatic way is to store their UIDs in the database and then check against that in your security rules.
So for example, you could have this in the database:
"uidsThatAreAllowedToRead": {
"uid1": true,
"uid2": true,
"uid3": true
}
And then in your read rule check against that with:
".read": "root.child('uidsThatAreAllowedToRead').child(auth.uid).exists()"
You could do the same with email addresses, but you'd have to encode them as keys cannot contain . characters which are required in an email address. The common encoding method is to replace each . with a ,, which conveniently is allowed in the database keys but not in email addresses.

Allow access to Firebase Firestore depending on user permissions

I want to build an iOS app where the users have different permissions to access a document. How can I give the user read/write access when he is an admin, only read when he is a viewer and no access otherwise to a document using Firestore rules? Every user is allowed to create new documents.
My Firebase Rules:
service cloud.firestore {
match /databases/{database}/documents {
match /{document=**} {
allow read, write: if true;
}
}
}
How I added admin and viewers of each document
When the users email (I'me using Firebase Auth) is on the list, he is admin or viewer.
I'me an iOS Developer and therefor have no experience with Java Script.

Ok, I Am Android Developer but I Have solved your problem You should put a statement in your app to check if an account is Admin or not (example) { The User Input his email, and now we will chick if his account found in admins or viewers so we will use code (it's just example code) Create button invisible and enabled=false FireBase.child("Admins/"+inputuser).addValuelistener.(new AddValueListener....... if(snapshot.getValue.toString!=null){ the user is admin button=visble and enabled=true }else{ the user is viewer } I Hope you understand me

I researched a bit and came up with a solution:
service cloud.firestore {
match /databases/{database}/documents {
match /organizations/{organization} {
allow create: if allowCreate();
allow update, delete: if allowWrite();
allow read: if allowRead();
}
}
function allowCreate () {
return request.auth != null;
}
function allowRead() {
return resource.data.viewers.hasAll([request.auth.token.email]) ||
resource.data.admins.hasAll([request.auth.token.email]);
}
function allowWrite() {
return resource.data.admins.hasAll([request.auth.token.email])
}
}

Add Google authentication to Firebase Real Time Database

I'm using the Firebase Real Time Database and I need to add user authentication to it. Users can only login with Google as a provider.
Current database mode:
{
"rules": {
".read": true,
".write": true
}
}
New mode should be like this:
// These rules grant access to a node matching the authenticated
// user's ID from the Firebase auth token
{
"rules": {
"users": {
"$uid": {
".read": "$uid === auth.uid",
".write": "$uid === auth.uid"
}
}
}
}
What should I use to authenticate in my case? userID, Google providerID or a token like described here?
This is the function without authentication to store data:
createMeetup ({commit, getters}, payload) {
console.log('index.js -> createMeetup')
const meetup = {
title: payload.title,
}
let imageUrl
let key
firebase.database().ref('meetups').push(meetup)
.then((data) => {
key = data.key
return key
})
.then(() => {
commit('createMeetup', {
...meetup,
imageUrl: imageUrl,
id: key
})
})
.catch((error) => {
console.log(error)
})
},

For your use case it seems like you need to sort out a few steps. I'm guessing your application can already connect/use Firebase, but these are essentially it:
Step 1 - Connecting
Connect to Firebase using your API key/config as per usual, should look something like the following.
firebase.initializeApp(config)
See also: https://firebase.google.com/docs/web/setup
You probably already have this somewhere. This does not change, but if you would apply the rules as described your users would not be able to use Firebase after just connecting.
Step 2 - Authenticating
This is basically telling Firebase who is connected. This must be done with a token/method Firebase can verify. Using a Google ID is the most common method.
With an existing Google ID / user login
// Initialize a generate OAuth provider with a `google.com` providerId.
var provider = new firebase.auth.OAuthProvider('google.com');
var credential = provider.credential(googleUser.getAuthResponse().id_token);
firebase.auth().signInWithCredential(credential)
See also: https://firebase.google.com/docs/reference/js/firebase.auth.OAuthProvider#credential
Or make Firebase SDK do the login flow
var provider = new firebase.auth.GoogleAuthProvider();
firebase.auth().signInWithPopup(provider).then(function(result) {
// This gives you a Google Access Token. You can use it to access the Google API.
var token = result.credential.accessToken;
// The signed-in user info.
var user = result.user;
// ...
})
See also: https://firebase.google.com/docs/auth/web/google-signin
This last option is preferred / suggested by the documentation you referenced.
If, as you described, users can already login with Google to your app for other functionalities then you should already have a login flow somewhere. Depending on your situation it might be advisable to let the Firebase SDK / library take over this process for simplicity in your application.
Step 3 - Using the database
Lastly, after authenticating users and applying the rules you suggested you will need to also make sure the paths you write to are within those accessible by the current user. You can put this in a simple function to make it easier.
const getUserRef = (ref) => {
const user = firebase.auth().currentUser;
return firebase.database().ref(`/users/${user.uid}/${ref}/`);
}
You should of course not be retrieving the current user every time you want to get a database reference, but I think this clearly illustrates the steps that need to be taken.

You can allow users to login/auth using multiple methods. Then you can merge them together to a single account as described here:
https://firebase.google.com/docs/auth/web/account-linking
So really it boils down to two options:
Allow users to login with multiple methods such as Facebook, Google, Github, basic username/password, etc.
Or allow only a single login method such as Google only.
Whichever options you pick will help you decide which ID to use.

The auth rules in your question are only stating that the users can read/write their own (presumably) user data.
I assume that you are rather looking for a solution to authorize the user to create meetup data and you should crerate rules similar to this:
These rules allow any user that is logged in to create meetups
{
"rules": {
"meetups": {
"$meetupId": {
".read": "auth.uid != null",
".write": "auth.uid != null"
}
}
}
}
Your code-snippet that pushes new meetup data to the database will automatically try and succeed or fail depending on whether the user was logged in or not. You don't need to specifically tell Firebase in which way the user was logged in. Firebase SDK will take care of the authentication for you.
But if you do want to provide different mechanisms depending on which login type that the user is authenticated with, you can check it in the rules. For example if you want to make sure that the user is not just "anonymously" logged in.
See the documentation: https://firebase.google.com/docs/database/security/user-security#section-variable

the documentation has you covered there: Authenticate Using Google Sign-In with JavaScript.
You can let your users authenticate with Firebase using their Google Accounts by integrating Google Sign-In into your app. You can integrate Google Sign-In either by using the Firebase SDK to carry out the sign-in flow, or by carrying out the Google Sign-In flow manually and passing the resulting ID token to Firebase.
Before you begin:
Add Firebase to your JavaScript project.
Enable Google Sign-In in the Firebase console:
In the Firebase console, open the Auth section.
On the Sign in method tab, enable the Google sign-in method and click Save.
Handle the sign-in flow with the Firebase SDK
If you are building a web app, the easiest way to authenticate your users with
Firebase using their Google Accounts is to handle the sign-in flow with the
Firebase JavaScript SDK. (If you want to authenticate a user in Node.js or
other non-browser environment, you must handle the sign-in flow manually.)
To handle the sign-in flow with the Firebase JavaScript SDK, follow these steps:
Create an instance of the Google provider object:
var provider = new firebase.auth.GoogleAuthProvider();
Optional: Specify additional OAuth 2.0 scopes that you want to request from the authentication provider. To add a scope, call addScope().
For example:
provider.addScope('https://www.googleapis.com/auth/contacts.readonly');
See the authentication provider documentation.
Optional: To localize the provider's OAuth flow to the user's preferred language without explicitly passing the relevant custom OAuth parameters, update the language code on the Auth instance before starting the OAuth flow.
For example:
firebase.auth().languageCode = 'pt';
// To apply the default browser preference instead of explicitly setting it.
// firebase.auth().useDeviceLanguage();
Optional: Specify additional custom OAuth provider parameters that you want to send with the OAuth request. To add a custom parameter, call setCustomParameters on the initialized provider with an object containing the key as specified by the OAuth provider documentation and the corresponding value.
For example:
provider.setCustomParameters({
'login_hint': 'user#example.com'
});
Reserved required OAuth parameters are not allowed and will be ignored. See the authentication provider reference for more details.
Authenticate with Firebase using the Google provider object. You can prompt your users to sign in with their Google Accounts either by opening a pop-up window or by redirecting to the sign-in page. The redirect method is preferred on mobile devices.
To sign in with a pop-up window, call signInWithPopup:
firebase.auth().signInWithPopup(provider).then(function(result) {
// This gives you a Google Access Token. You can use it to access the Google API.
var token = result.credential.accessToken;
// The signed-in user info.
var user = result.user;
// ...
}).catch(function(error) {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
// The email of the user's account used.
var email = error.email;
// The firebase.auth.AuthCredential type that was used.
var credential = error.credential;
// ...
});
Also notice that you can retrieve the Google provider's OAuth token which can be used to fetch additional data using the Google APIs.
This is also where you can catch and handle errors. For a list of error codes have a look at the Auth Reference Docs.
To sign in by redirecting to the sign-in page, call signInWithRedirect:
firebase.auth().signInWithRedirect(provider);
Then, you can also retrieve the Google provider's OAuth token by calling getRedirectResult() when your page loads:
firebase.auth().getRedirectResult().then(function(result) {
if (result.credential) {
// This gives you a Google Access Token. You can use it to access the Google API.
var token = result.credential.accessToken;
// ...
}
// The signed-in user info.
var user = result.user;
}).catch(function(error) {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
// The email of the user's account used.
var email = error.email;
// The firebase.auth.AuthCredential type that was used.
var credential = error.credential;
// ...
});

Administrator Views for a Firebase Web Application: How To

My Firebase web app requires administrator access, i.e., the UI should show a few things only for admins (an 'administrator' section). I came up with the below as a means to authorize the UI to display the admin section for valid admins only. My question is, good or bad? Is this a sound means of authorizing? ...so many ways to do this. This particular way requires me to configure admins in the security rules (vs in a node/tree in a db/firestore)
My idea is that if the .get() fails due to unauthorized access, I tell my app logic the user is not an admin, if the .get() succeeds my logic shows the 'admin' sections. Of course, the 'sections' are just HTML skeletons/empty elements populated by the database so even if the end user hacks the JS/logic, no real data will be there - only the empty 'admin section' framework.
function isAdmin(){
return new Promise(function(resolve, reject){
var docRef = firebase.firestore().collection("authorize").doc("admin");
docRef.get().then(function(result) {
if (result) {
resolve (true);
}
}).catch(function(error) {
resolve (false);
});
});
}
The firestore rule specifies the 'admins' by UID.
service cloud.firestore {
match /databases/{database}/documents {
match /{document=**} {
allow read, write: if request.auth.uid == "9mB3UxxxxxxxxxxxxxxxxxxCk1";
}
}
}

You're storing the role of each user in the database, and then looking it up in the client to update its UI. This used to be the idiomatic way for a long time on realtime database, and it still works on Firestore.
The only thing I'd change is to have the rules also read from /authorize/admin, instead of hard-coding the UID in them. That way you only have the UID in one place, instead of having it in both the rules and the document.
But you may also want to consider an alternative: set a custom claim on your admin user, that you can then read in both the server-side security rules (to enforce authorized access) and the front-end (to optimize the UI).
To set a custom claim you use the Firebase Admin SDK. You can do this on a custom server, in Cloud Functions, but in your scenario it may be simpler to just run it from your development machine.

Detailed How To: Firebase has what's called Custom Claims for this functionality as detailed in their Control Access with Custom Claims and Security Rules. Basically, you stand up a separate node server, install the Firebase AdminSDK:
npm install firebase-admin --save
Generate/Download a Private Key from the Service Accounts tab in the Firebase Console and put that on your node server. Then simply create a bare bones node app to assign Custom Claims against each UID (user) that you wish. Something like below worked for me:
var admin = require('firebase-admin');
var serviceAccount = require("./the-key-you-generated-and-downloaded.json");
admin.initializeApp({
credential: admin.credential.cert(serviceAccount),
databaseURL: "https://xxxxxxxxxxxxxxxxxxxx.firebaseio.com"
});
admin.auth().setCustomUserClaims("whatever-uid-you-want-to-assign-claim-to", {admin: true}).then(() => {
console.log("Custom Claim Added to UID. You can stop this app now.");
});
That's it. You can now verify if the custom claim is applied by logging out of your app (if you were previously logged in) and logging back in after you update your web app's .onAuthStateChanged method:
firebase.auth().onAuthStateChanged(function(user) {
if (user) {
firebase.auth().currentUser.getIdToken()
.then((idToken) => {
// Parse the ID token.
const payload = JSON.parse(window.atob(idToken.split('.')[1]));
// Confirm the user is an Admin.
if (!!payload['admin']) {
//showAdminUI();
console.log("we ARE an admin");
}
else {
console.log("we ARE NOT an admin");
}
})
.catch((error) => {
console.log(error);
});
}
else {
//USER IS NOT SIGNED IN
}
});

Using JavaScript and Firebase, how can I create user specific objects?

All I am really trying to do here is allow a user to create an object such that only that user can see and change it. So, for example: I have code that looks similar to this:
function createAccount(email, pass){
firebase.auth().createUserWithEmailAndPassword(email,pass).catch(function(error) {
var errorCode = error.code;
var errorMessage = error.message;
console.log(errorCode+":"+errorMessage);
});
}
I also have a function that I call createAccountHome() that I am hoping to be structured like:
function createAccountHome(){
firebase.database().ref().child('Profiles').push({
// user id : something to link object solely to this user
// data: data
});
}
I am hoping that by the end of this phase, I can create an account, and then have a profile generated automatically for the user so that the user only has write access to his/her own information.

The most common way to archieve this is to save user data under their user id. So instead of using push() you use set() like this:
firebase.database().ref().child('Profiles').child(user.uid).‌​set({
//data:data
})
And to make sure users can only see and edit their own profile you use these security rules:
{
"rules": {
"Profiles": {
"$uid": {
".read": "auth != null && auth.uid ==$uid",
".write": "auth != null && auth.uid ==$uid"
}
}
}
}
And for some reading: link to old docs explaining more about storing user data.