firebase-admin 0.1.2

An open-source Firebase Admin SDK for Rust, starting with Authentication
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# firebase-admin-rs

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An open-source, community-maintained **Firebase Admin SDK for Rust**.

The Rust ecosystem has no mature, actively-maintained Firebase Admin SDK.
This project aims to fill that gap: starting with **Authentication**, and
expanding feature-by-feature toward a full SDK (Firestore, Cloud Storage,
Realtime Database, Cloud Messaging, ...).

## Status

**Pre-1.0, under active development.** The public API may change between
`0.x` releases. See the [roadmap](#roadmap) below.

## Features (Authentication)

- ID token verification (RS256, JWKS caching, full claim validation)
- Custom token creation (signed locally with a service account key)
- Session cookie creation and verification — verified against Google's
  session-cookie certificate endpoint, which is distinct from the ID-token
  JWKS endpoint (confirmed against the official Admin SDKs; see
  [`ARCHITECTURE.md`](ARCHITECTURE.md))
- User management (create, get, update, delete, list, custom claims) via the
  Identity Toolkit REST API, against both the **Firebase Auth Emulator** and
  **production Firebase** — OAuth2 bearer tokens are acquired automatically
  via [`gcp_auth`](https://crates.io/crates/gcp_auth) for both explicit
  service account keys and Application Default Credentials
- A single, unified client for both production Firebase and the local
  [Firebase Auth Emulator](https://firebase.google.com/docs/emulator-suite) —
  no divergent APIs or generic type parameters to juggle

All of the above work end-to-end against production Firebase when the
default `live-user-management` feature is enabled (it is on by default).

## Quick start

```rust,no_run
use firebase_admin::auth::AuthClient;
use firebase_admin::core::ServiceAccountKey;

#[tokio::main]
async fn main() -> Result<(), firebase_admin::Error> {
    let key = ServiceAccountKey::from_file("service-account.json")?;
    let auth = AuthClient::builder("my-project-id")
        .service_account_key(key)
        .build()?;

    let claims = auth.verify_id_token("<id-token-from-client>").await?;
    println!("verified uid: {}", claims.sub);

    Ok(())
}
```

Switching to the local emulator requires no code changes — just set
`FIREBASE_AUTH_EMULATOR_HOST=localhost:9099` in your environment, or call
`.use_emulator("localhost:9099")` on the builder explicitly.

More examples live in [`examples/`](examples/).

## Why another Firebase crate?

A few Firebase-related crates exist for Rust, but none combine ID token
verification, custom token creation, and full user management under one
well-documented, actively-maintained, community-oriented roof. This project
is built to be that crate — see [`ARCHITECTURE.md`](ARCHITECTURE.md) for the
design rationale, including why the live/emulator client is a single
concrete type rather than generic over credentials.

## Roadmap

- **v0.1.0 (current)** — ID token verification, custom token creation,
  session cookie creation and verification, and full user management
  (create/get/update/delete/list, custom claims) against both the emulator
  and production Firebase via OAuth2 bearer tokens (service account +
  Application Default Credentials).
- **v0.2.0** — Bulk user import, email action links, initial multi-tenancy.
- **v0.3.0** — Broader edge-case coverage on the token-verification path
  (expired/rotated certificates, malformed key responses, clock-skew
  handling) ahead of a security review.
- **v1.0.0** — Feature-complete Auth, stable public API, full documentation
  coverage, security review of the token-verification path.
- **Post-1.0** — Firestore, then Cloud Storage, Realtime Database, Cloud
  Messaging, Remote Config, as additive modules.

## Contributing

Contributions are very welcome — see [`CONTRIBUTING.md`](CONTRIBUTING.md) to
get started, and [`ARCHITECTURE.md`](ARCHITECTURE.md) to understand the
module layout. Please also read the [Code of Conduct](CODE_OF_CONDUCT.md).

## Security

See [`SECURITY.md`](SECURITY.md) for how to report vulnerabilities.

## License

Licensed under either of

- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE))
- MIT license ([LICENSE-MIT](LICENSE-MIT))

at your option.