I have migrated data to firebase storage, which have structure like:
<fileId>/<filename>
I can store fileIds associated with user in firebase database like:
<userId>/<fileids>
Is there anyway I can get something like auth.uid/fileids from firebase database in security rules of firestorage, to only allow to read file to auth user, if fileIds belong to him. If not, what all options are available to achieve the same and which one is best among them?
It's currently not possible to use data from databases in your Cloud Storage security rules. You can only use information about the object stored in the bucket.
You could instead write a backend API that performs all the checks and then operates on the object in storage, or store information about the file in its metadata for use in rules.
Related
I have a database having multiple groups - each having their own roles (admins, mods, etc..)
I have rules setup on firestore.
How do I replicate that on storage rules ?
To put it briefly, you can't without serious modifications.
Storage rules can't access Firestore documents. So all of the relationship you have in Firestore can not be used in Storage.
You can use Firebase Auth custom claims to attach per-user data that can be used in both Firestore and Storage, but this means you will have to duplicate that relationship data into those claims and keep them in sync in backend code.
You can also duplicate data from Firestore into metadata attached to files in Storage, and use that metadata in security rules to determine who can read or write individual files.
These are your only viable options without creating your own backend API endpoints that enforce security.
I would like to use data in the realtime database to allow user access in the firestore database. Is it possible to reference nodes in the realtime database from the firestore security rules?
It is currently not possible to cross between database products like this in security rules. Please feel free to file a feature request for this.
You can, however, write code to run on Cloud Functions that deals with database changes after the change has happened, and undo or restrict the change there.
I have created an app, that allows users to create a simple photo collection. All the data is stored in the Firebase Cloud Firestore. The images are uploaded to Firebase Storage.
The owner of a collection can invite any other user to access his collection and upload photos.
The sharing of data in Firestore works fine. But now I have problems with writing the security rules for Storage. Does anyone know, how I have to write the rules, so that any user added to the collection can access the images as well? The files for each collection are stored in separate folders.
Firebase security rules currently do not bridge between products. You can't use data in Cloud Firestore in security rules for Cloud Storage. The only things you have access to in security rules for Cloud Storage are object metadata and Firebase Authentication custom claims per user. You will have to figure out a way to make changes to either one of those things to implement your permissions.
Alternatively, you can direct all access through Cloud Functions to decide if the user should be able to access the content, but bear in mind that Cloud Functions responses can only be 10MB maximum.
You should look into creating a private group and authenticate the group with help of private token.
https://firebase.google.com/docs/storage/security/user-security#group_private
I need to check a document's data in Firestore to allow someone to view an image in Firebase Storage. Is this possible?
It is currently not possible to access Cloud Firestore documents directly from Cloud Storage rules. You have two options:
Somehow use Firebase Authentication custom claims on the user account to determine if a user should be able to access a file.
Use some backend code (maybe a Cloud Functions HTTP trigger) that the user accesses to download the file if the conditions are met.
In either case, you will need some backend code that checks and sets the appropriate data.
I understand that I can specify rules for some features in firebase like real-time database and firebase storage.
Example:
I can specify a rule in real time database that allows only users to update their data under their specific UID.
Question:
Is it possible to specify a rule in firebase storage such that a user can download a file (ex: image) if and only if he exists under a certain node in the real time database?
Is this communication between security rules of different products possible?
If no, what can I do?
Thanks.
You can't communicate between products like this.
What you can do instead is use custom claims on authenticated user profiles to control who can access what locations in various products.
Read more about custom claims here.
Read more about realtime database rules with custom claims. Read about auth.token.
In Firestore, you can use request.auth.token to access custom claims.
In Cloud Storage, you can also use request.auth.token.