barycenter/README.md

# Barycenter

An OpenID Connect Identity Provider (IdP) implementing OAuth 2.0 Authorization Code flow with PKCE.

## Overview

Barycenter is a lightweight, standards-compliant OpenID Connect Identity Provider written in Rust. It implements the OAuth 2.0 Authorization Code flow with Proof Key for Code Exchange (PKCE), making it suitable for modern web and mobile applications.

## Features

- **OAuth 2.0 Authorization Code Flow** with PKCE (S256)
- **Dynamic Client Registration** - RFC 7591 compliant
- **Token Endpoint** - Multiple authentication methods (client_secret_basic, client_secret_post)
- **ID Token Signing** - RS256 with proper at_hash and nonce support
- **UserInfo Endpoint** - Bearer token authentication
- **Discovery** - OpenID Connect Discovery and JWKS publication
- **Property Storage** - Simple key-value storage for user properties

## Technology Stack

- **Language**: Rust
- **Web Framework**: [axum](https://github.com/tokio-rs/axum)
- **Database**: SQLite via [SeaORM](https://www.sea-ql.org/SeaORM/)
- **Cryptography**: [josekit](https://github.com/hidekatsu-izuno/josekit-rs) for JOSE/JWT operations
- **Configuration**: [config-rs](https://github.com/mehcode/config-rs) with TOML support

## Quick Start

### Prerequisites

- Rust 1.70 or later
- SQLite 3

### Installation

```bash
# Clone the repository
git clone https://github.com/CloudNebulaProject/barycenter.git
cd barycenter

# Build the project
cargo build --release
```

### Configuration

Create a `config.toml` file (see `config.toml` for example):

```toml
[server]
host = "127.0.0.1"
port = 8080
public_base_url = "http://localhost:8080"

[database]
connection_string = "sqlite://crabidp.db?mode=rwc"

[keys]
jwks_path = "data/jwks.json"
private_key_path = "data/private_key.pem"
signing_algorithm = "RS256"
```

### Running

```bash
# Run with default config
cargo run

# Run with custom config
cargo run -- --config path/to/config.toml

# Run with debug logging
RUST_LOG=debug cargo run
```

## Development

### Building

```bash
# Debug build
cargo build

# Release build
cargo build --release

# Check without building
cargo check
```

### Testing

```bash
# Run all tests
cargo test

# Run tests with logging
RUST_LOG=debug cargo test
```

### Logging

Set the `RUST_LOG` environment variable to control logging levels:

```bash
# Debug level for all modules
RUST_LOG=debug cargo run

# Trace level for barycenter only
RUST_LOG=barycenter=trace cargo run
```

## API Endpoints

### Discovery
- `GET /.well-known/openid-configuration` - OpenID Provider metadata
- `GET /.well-known/jwks.json` - Public signing keys

### OAuth/OIDC
- `GET /authorize` - Authorization endpoint
- `POST /token` - Token endpoint
- `GET /userinfo` - UserInfo endpoint
- `POST /connect/register` - Dynamic client registration

### Properties (Non-standard)
- `GET /properties/:owner/:key` - Get property value
- `PUT /properties/:owner/:key` - Set property value

## Project Status

This is an early-stage implementation. See `docs/next-iteration-plan.md` for planned features and `docs/oidc-conformance.md` for OpenID Connect compliance details.

**Currently Implemented:**
- Authorization Code flow with PKCE (S256)
- Dynamic client registration
- Token issuance and validation
- ID Token generation with RS256 signing
- UserInfo endpoint

**Pending Implementation:**
- User authentication and session management
- Consent flow
- Refresh tokens
- Token revocation and introspection
- OpenID Federation support

## Contributing

Please read [CONTRIBUTING.md](CONTRIBUTING.md) for details on our code of conduct, development workflow, and the process for submitting pull requests.

## License

[Add your license here]

## Acknowledgments

Built with support from the OpenID Connect and OAuth 2.0 communities.