I'm really new to Firebase and React Native and I'm building a user-based app. In Firebase, users are authenticated with a token and they seem to be restricted when it comes to personal properties. As far as I understood, how it works is, users are automatically assigned with both token and userId. And if you want to add additional info you create an object in the Realtime Database to store users and you assign said users with the ID they belong.
So what I have is a couple of users and I have two user objects with some properties.
enter image description here
I'm using Axios to do a GET request only for authenticated users:
` const authCtx = useContext(AuthContext);
const token = authCtx.token;
// console.log(token);
useEffect(() => {
axios
.get(
"https://fbapp-(heart)-default-rtdb.firebaseio.com/users.json?auth=" +
token
)
.then((response) => {
console.log(response.data);
});
}, [token]);`
My firebase rule is:
` {
"rules":{
".write": "auth.uid != null ",
".read" : "auth.uid != null"
}
}`
The issue here is that with those rules each authenticated user gets access to the Realtime DB. So after some research, I've found out that I can set my rules like so:
` {
"rules": {
"users":{
"$user_id":{
".write": "auth.uid === $user_id",
".read": "auth.uid === $user_id"
}
}
}
}`
As far as I understood that rule's for all the users, that have the user_id property and only those users with the current UID can access them. But that's when I get the following error:
WARN:Possible Unhandled Promise Rejection (id: 0):
[AxiosError: Request failed with status code 401]
The documentation says that auth variable contains uid (A unique user ID assigned to the requesting user). The user is authenticated successfully but still doesn't work. Please help!
Thank you in advance^^
UPDATE:I've found a way to make it work, but I think there's a security issue with the solution. Instead of naming the users "user1, user2,..." I tried naming them with the UID and change my url to:
"https://fbapp-(not here)-default-rtdb.firebaseio.com/users/"+{user_id}+ ".json?auth="+{token}
Not sure if that is correct.
Use access_token to authenticate REST requests.
`https://<DATABASE_NAME>.firebaseio.com/users.json?access_token=${token}`
See Authenticate with an access token for details.
I created an app where anonymous users can write comments. Now I want them also to edit and delete (only) their comments. Is this possible without using firebase auth?
Since it is only a one-time app for the user its kind of an overkill to create a login for each user.
I tried to store an editKey with the comment-object which should allow the user to edit / delete his comment. (I store this key for the user in a cookie in the browser)
Then somehow deny reading the editKey (".read:" false) via firebase rules. Only allow the write operation when the editKey is known: ".write": "data.val() == newData.val()"
"comments" : {
".read": true,
"$comment_id": {
".write": "!data.exists() && newData.exists()",
"text": {
".validate": "newData.isString()"
},
"created": {
".validate": "newData.isNumber()"
},
"editKey": {
".read": false,
".write": "data.val() == newData.val()",
".validate": "newData.isString()"
},
"visible": {
".validate": "newData.isBoolean()"
},
}
}
But this does not work because the whole comment, which should be public, is not readable when I set the rule ".read:" false for the editKey
Any ideas how this could be achieved without firebase.auth() ?
You are looking for Authenticate with Firebase Anonymously
https://firebase.google.com/docs/auth/web/anonymous-auth#authenticate-with-firebase-anonymously
You can use Firebase Authentication to create and use temporary
anonymous accounts to authenticate with Firebase. These temporary
anonymous accounts can be used to allow users who haven't yet signed
up to your app to work with data protected by security rules. If an
anonymous user decides to sign up to your app, you can link their
sign-in credentials to the anonymous account so that they can continue
to work with their protected data in future sessions.
Simple enough question:
How do I restrict paths, such as...
/orders/<userid>
/cart/<userid>
/transactions/<userid>/txid
...only to users whose userid matches the one in the path?
I have authentication set up and I need to subscribe to some of these in Vue after firebase.auth().onAuthStateChanged
It appears, as per the docs here, that in the following rule example, the user token must match the key exactly:
{
"rules": {
"users": {
"$user_id": {
// grants write access to the owner of this user account
// whose uid must exactly match the key ($user_id)
".write": "$user_id === auth.uid"
}
}
}
}
Does this mean that, /orders/123456/order123478 will be restricted and only available to user 123456?
For the realtime database, update your rules to something like this:
{
"rules": {
"orders": {
"$uid": {
".read": "auth.uid == $uid",
".write": "auth.uid == $uid"
}
}
}
}
The $uid key represents any key nested at that level and allows you to reference it in your rules. The auth variable is provided by Firebase and contains details about the authenticated user who issued the request, so you can compare the requesting user's uid with the database's uid key and grant permissions if they match (the nested ".read" and ".write" values).
So for a user who's uid is user1, they would have access to the following data:
{
"orders": {
"user1": {
"order1": read/write,
"order2": read/write
},
"user2": {
"order1": no access,
"order2": no access
},
"user3": {
"order1": no access,
"order2": no access
},
}
Read the documentation and play around with the simulator found in the Rules section of the Firebase dashboard.
I've followed the guide from a documentation of firebase on how to fetch the data.
I try to play around with the:
sample of firebase here
However, to get database data need to auth. Is there anyway just only fetch like feed from firebase without auth? I need to read on my own blog to be read for public.
Please..help me to solve this issue.
Thanks.
You could set your rules to this:
{
"rules": {
".read": "true",
".write": "auth != null"
}
}
But this means anyone who has access the database can read all the data.
In your code you would do something like this:
firebase.database().ref("blogItems").on('value', function(snapshot) {
console.log(snapshot.val());
});
If your setup is like this:
firebase-database-123
|
|_blogItems
|
|_entry1
|
|_entry2
I would recommend you get familiar with Firebase Database Security Rules.
These are the ones which dictate who can read/write into the Firebase Database.
All new projects starts with the rules
{
rules: {
.read: auth != null,
.write: auth != null
}
}
This means anyone who isn't authenticated won't be able to read or write in our database.
To achieve what you might need without compromising other data you may do something like the following:
{
rules: {
.read: auth != null,
.write: auth != null
blogEntries: {
.read: true,
.write: auth != null
}
}
}
By doing this you are allowing everyone to read the data inside blogEntries, and this means ALL the data inside, while if someone wants to write data to blogEntries they should be authenticated.
I recommend watching The key to Firebase Security to further understand what can be achieved and how Security Rules work.
Yes, you can get the data without authenticating, but it's not recommended. I did the following setup in the Firebase.
Step 1
Click on Realtime Database's GET STARTED
Step 2
Click on second option start in test mode you can access data without auth
or
Add following lines in rules
{
"rules": {
".read": true,
".write": true
}
}
I'm relatively new to coding and am having trouble.
I have this code to send data to firebase
app.userid = app.user.uid
var userRef = app.dataInfo.child(app.users);
var useridRef = userRef.child(app.userid);
useridRef.set({
locations: "",
theme: "",
colorScheme: "",
food: ""
});
However, I keep getting the error:
FIREBASE WARNING: set at /users/(GoogleID) failed: permission_denied
2016-05-23 22:52:42.707 firebase.js:227 Uncaught (in promise) Error: PERMISSION_DENIED: Permission denied(…)
When I try to look this up it talks about rules for Firebase, which seems to be in a language that I haven't learned yet (or it is just going over my head). Can someone explain what is causing the issue? I thought it was that I was asking for it to store email and user display name and you just weren't allowed to do this, but when I took those out I still had the same problem. Is there a way to avoid this error without setting the rules, or are rules something I can teach myself how to write in a day, or am I just way out of my league?
Thanks for any help!
By default the database in a project in the Firebase Console is only readable/writeable by administrative users (e.g. in Cloud Functions, or processes that use an Admin SDK). Users of the regular client-side SDKs can't access the database, unless you change the server-side security rules.
You can change the rules so that the database is only readable/writeable by authenticated users:
{
"rules": {
".read": "auth != null",
".write": "auth != null"
}
}
See the quickstart for the Firebase Database security rules.
But since you're not signing the user in from your code, the database denies you access to the data. To solve that you will either need to allow unauthenticated access to your database, or sign in the user before accessing the database.
Allow unauthenticated access to your database
The simplest workaround for the moment (until the tutorial gets updated) is to go into the Database panel in the console for you project, select the Rules tab and replace the contents with these rules:
{
"rules": {
".read": true,
".write": true
}
}
This makes your new database readable and writeable by anyone who knows the database's URL. Be sure to secure your database again before you go into production, otherwise somebody is likely to start abusing it.
Sign in the user before accessing the database
For a (slightly) more time-consuming, but more secure, solution, call one of the signIn... methods of Firebase Authentication to ensure the user is signed in before accessing the database. The simplest way to do this is using anonymous authentication:
firebase.auth().signInAnonymously().catch(function(error) {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
// ...
});
And then attach your listeners when the sign-in is detected
firebase.auth().onAuthStateChanged(function(user) {
if (user) {
// User is signed in.
var isAnonymous = user.isAnonymous;
var uid = user.uid;
var userRef = app.dataInfo.child(app.users);
var useridRef = userRef.child(app.userid);
useridRef.set({
locations: "",
theme: "",
colorScheme: "",
food: ""
});
} else {
// User is signed out.
// ...
}
// ...
});
I was facing similar issue and found out that this error was due to incorrect rules set for read/write operations for real time database. By default google firebase nowadays loads cloud store not real time database. We need to switch to real time and apply the correct rules.
As we can see it says cloud Firestore not real time database, once switched to correct database apply below rules:
{
"rules": {
".read": true,
".write": true
}
}
Note:
Be careful with the rules. By setting read and write to true makes database vulnerable to praying eyes.
Read more:
https://firebase.google.com/docs/database/security
Go to the "Database" option you mentioned.
There on the Blue Header you'll find a dropdown which says Cloud Firestore Beta
Change it to "Realtime database"
Go to Rules and set .write .read both to true
Copied from here.
Go to database, next to title there are 2 options:
Cloud Firestore, Realtime database
Select Realtime database and go to rules
Change rules to true.
OK, but you don`t want to open the whole realtime database!
You need something like this.
{
/* Visit https://firebase.google.com/docs/database/security to learn more about security rules. */
"rules": {
".read": "auth.uid !=null",
".write": "auth.uid !=null"
}
}
or
{
"rules": {
"users": {
"$uid": {
".write": "$uid === auth.uid"
}
}
}
}
Open firebase, select database on the left hand side.
Now on the right hand side, select [Realtime database] from the drown and change the rules to:
{
"rules": {
".read": true,
".write": true
}
}
Another solution is to actually create or login the user automatically if you already have the credentials handy. Here is how I do it using Plain JS.
function loginToFirebase(callback)
{
let email = 'xx#xx.com';
let password = 'xxxxxxxxxxxxxx';
let config =
{
apiKey: "xxx",
authDomain: "xxxxx.firebaseapp.com",
projectId: "xxx-xxx",
databaseURL: "https://xxx-xxx.firebaseio.com",
storageBucket: "gs://xx-xx.appspot.com",
};
if (!firebase.apps.length)
{
firebase.initializeApp(config);
}
let database = firebase.database();
let storage = firebase.storage();
loginFirebaseUser(email, password, callback);
}
function loginFirebaseUser(email, password, callback)
{
console.log('Logging in Firebase User');
firebase.auth().signInWithEmailAndPassword(email, password)
.then(function ()
{
if (callback)
{
callback();
}
})
.catch(function(login_error)
{
let loginErrorCode = login_error.code;
let loginErrorMessage = login_error.message;
console.log(loginErrorCode);
console.log(loginErrorMessage);
if (loginErrorCode === 'auth/user-not-found')
{
createFirebaseUser(email, password, callback)
}
});
}
function createFirebaseUser(email, password, callback)
{
console.log('Creating Firebase User');
firebase.auth().createUserWithEmailAndPassword(email, password)
.then(function ()
{
if (callback)
{
callback();
}
})
.catch(function(create_error)
{
let createErrorCode = create_error.code;
let createErrorMessage = create_error.message;
console.log(createErrorCode);
console.log(createErrorMessage);
});
}
PermissionDenied can also appear if provided Firebase project ID is incorrect.
See this guide to check your project ID:
Firebase console: Click settings Project settings. The project ID is displayed in the top pane.
If you are attempting to reuse an old project in firebase, due to free account restrictions, then your database rules are probably outdated.
In my case, I was getting error 401 Unauthorized and it solved when I set both read and write rules equal to true.
Thanks for this great community!
Much respect from Brazil!
i was also having the same problem. make sure that you are using the real-time database instead of the cloud. then change rules to allow access to all users as follows
{
"rules": {
".read": true,
".write": true
}
}
by default the firestore database only allows admins to read and write from the database thus the read/write rules will be set to false.