armasec-lite

Injectable FastAPI auth via OIDC, with three dependencies instead of ten.

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armasec-lite validates bearer tokens against your identity provider's JWKS, checks scopes and issuer/audience claims, and guards a route with a single Depends(). It is a dependency-minimal reimplementation of armasec 3.x with the same public API, built almost entirely on the standard library. Runtime dependencies are fastapi, cryptography and pydantic.

Install

uv add armasec-lite

The pytest fixtures, including the mock OIDC provider, live behind an extra:

uv add "armasec-lite[test]"

Usage

"""Secure a single route against one OIDC domain."""

import os

from armasec_lite import Armasec
from fastapi import Depends, FastAPI

app = FastAPI()
armasec = Armasec(
    domain=os.environ.get("ARMASEC_DOMAIN"),
    audience=os.environ.get("ARMASEC_AUDIENCE"),
)


@app.get("/stuff", dependencies=[Depends(armasec.lockdown("read:stuff"))])
async def check_access():
    return {"message": "Successfully authenticated!"}

Runnable variants, including multiple domains, match_keys, permission extractors and the plugin system, are in examples/.

Documentation

docs.vantagecompute.ai/developer/armasec-lite

Installation
Quickstart
Migrating from armasec covers every behavior difference from upstream 3.x, and what each one requires of you.
Security covers the JWT verification order, the threat model, and what the attack suite defends.
Architecture covers the request lifecycle, the caching model and the threading model.
API Reference

License

MIT. See LICENSE.

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