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README.md

Set Auth claims with Firestore

Author: Firebase (https://firebase.google.com)

Description: Set custom claims for Firebase Auth users from values set in Firestore.

🧩 Install this experimental extension

⚠️ Experimental: This extension is available for testing as an experimental release. It has not been as thoroughly tested as the officially released extensions, and future updates might introduce breaking changes. If you use this extension, please report bugs and make feature requests in our GitHub repository.

Console

Install this extension in your Firebase project

Firebase CLI

firebase ext:install firebase/firestore-auth-claims --project=<your-project-id>

Learn more about installing extensions in the Firebase Extensions documentation: console, CLI

Details: This extension will automatically sync data from the specified collection to custom claims on a corresponding Firebase Auth user. For example, if I have a user with a UID of abc123 I could use the Firestore SDK to set custom claims like so:

db.collection("user_claims")
  .doc("abc123")
  .set({
    role: "admin",
    groups: ["example1", "example2"],
  });

Once the document has been written, the extension will automatically set the same custom claims (in this case, role and groups) on the Firebase Auth user with a UID corresponding to the document ID.

Billing

This extension uses other Firebase or Google Cloud Platform services which may have associated charges:

  • Cloud Functions
  • Cloud Firestore

When you use Firebase Extensions, you're only charged for the underlying resources that you use. A paid-tier billing plan is only required if the extension uses a service that requires a paid-tier plan, for example calling to a Google Cloud Platform API or making outbound network requests to non-Google services. All Firebase services offer a free tier of usage. Learn more about Firebase billing.

Configuration Parameters:

  • Claims Collection: Firestore collection in which custom claims are stored. Must use Firebase Auth UIDs as document IDs.

  • Claims Field: The document field in which custom claims are stored. Leave blank to use all document data as custom claims. Custom claims must be an object.

  • Cloud Functions location: Where do you want to deploy the functions created for this extension? You usually want a location close to your database. For help selecting a location, refer to the location selection guide.

Cloud Functions:

  • sync: Processes document changes in the specified Cloud Firestore collection, syncing them to custom claims in Firebase Auth users.

Access Required:

This extension will operate with the following project IAM roles:

  • firebaseauth.admin (Reason: Allows the extension to set custom claims on Firebase Auth users.)

  • datastore.user (Reason: Allows the extension to write sync information back to Firestore.)