belgie-core 0.12.2

Core authentication logic for Belgie

Belgie Core: Authentication Primitives for Belgie Apps

[!WARNING] Belgie is currently in beta. The core API may change before v1.0 as the broader package set stabilizes.

Belgie Core is the orchestration layer behind Belgie's authentication flow. It wires settings, sessions, request-scoped clients, and FastAPI integration around the shared protocol interfaces in belgie-proto.

Use it when you want the core auth primitives without the higher-level package extras. If you only need the shared interfaces, see belgie-proto.

Installation

uv add belgie-core

[!NOTE] belgie-core depends on belgie-proto, and in this monorepo both packages are resolved from the workspace.

What It Includes

• Belgie for wiring settings, adapters, sessions, and FastAPI routes.
• BelgieClient for request-scoped auth operations against an injected database session.
• BelgieSettings, SessionSettings, CookieSettings, and URLSettings.
• SessionManager for session lifecycle handling.
• Session and state token helpers, plus scope validation utilities.
• Belgie-specific exception types for auth and configuration failures.

Quick Start

Here is the smallest useful setup for embedding Belgie Core in a FastAPI app:

Project Structure:

my-app/
├── server.py
└── models.py

server.py:

from collections.abc import AsyncGenerator

from fastapi import Depends, FastAPI, Request
from fastapi.security import SecurityScopes

from belgie_core import Belgie, BelgieClient, BelgieSettings
from belgie_proto.core.connection import DBConnection

from models import adapter, session_maker

settings = BelgieSettings(
    secret="your-secret-key",
    base_url="http://localhost:8000",
)


async def get_db() -> AsyncGenerator[DBConnection, None]:
    async with session_maker() as session:
        yield session


belgie = Belgie(settings=settings, adapter=adapter, database=get_db)
app = FastAPI()
app.include_router(belgie.router)


@app.get("/me")
async def me(
    request: Request,
    client: BelgieClient = Depends(belgie),
):
    user = await client.get_user(SecurityScopes(), request)
    return {"email": user.email}

Belgie Core also gives you Depends(belgie) for request-scoped client access and a router that mounts the auth endpoints for any plugins you register.

Configuration

• BELGIE_SECRET and BELGIE_BASE_URL are required by BelgieSettings().
• BELGIE_SESSION_*, BELGIE_COOKIE_*, and BELGIE_URLS_* control session lifetime, cookie behavior, and redirect URLs.
• Session cookies default to secure, HTTP-only, and SameSite=Lax.
• URL helpers default sign-in and sign-out redirects to /dashboard and /.

API Surface

• Import from belgie_core for the main package entry point.
• Import the shared connection protocol from belgie_proto.core.connection.
• Use belgie.router to mount auth routes in FastAPI.
• Use BelgieClient for authenticated request handlers and scope checks.