swarmauri_tokens_remoteoidc

Remote OIDC token verification service for Swarmauri.

This package provides a verification-only token service that retrieves JSON Web Key Sets (JWKS) from a remote OpenID Connect (OIDC) issuer and validates JWTs in accordance with RFC 7517 and RFC 7519. It implements ITokenService and exposes an entry point named RemoteOIDCTokenService.

Features

• Remote OIDC discovery with JWKS caching and conditional revalidation (ETag / Last-Modified).
• Audience and issuer validation with configurable clock-skew leeway.
• Optional extras for additional canonicalisation formats via the cbor extra.
• Manual refresh hook for cache priming plus a jwks() helper for introspection.
• Verification-only surface: mint() deliberately raises NotImplementedError.

Installation

pip

pip install swarmauri_tokens_remoteoidc

Poetry

poetry add swarmauri_tokens_remoteoidc

uv

uv add swarmauri_tokens_remoteoidc

Install the optional CBOR canonicalisation helpers with the cbor extra if needed:

pip install swarmauri_tokens_remoteoidc[cbor]
poetry add --extras cbor swarmauri_tokens_remoteoidc
uv add swarmauri_tokens_remoteoidc[cbor]

Usage

1. Provide the expected OIDC issuer URL. Optionally override jwks_url to skip discovery when you already know the JWKS endpoint.
2. Call refresh() to prime caches when your process boots or after a rotation signal.
3. Await verify() with the JWT to validate signatures, issuer, and optional audience or nonce constraints.

Example

The snippet below boots a minimal HTTP server that hosts a JWKS containing a symmetric key. It then mints a short-lived HS256 token and verifies it using RemoteOIDCTokenService.

import asyncio
import json
import threading
import time
from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer

import jwt
from jwt.utils import base64url_encode

from swarmauri_tokens_remoteoidc import RemoteOIDCTokenService

SECRET = b"super-secret-key"
KEY_ID = "demo-key"


def make_handler(jwks: dict):
    class Handler(BaseHTTPRequestHandler):
        def do_GET(self):
            if self.path != "/jwks.json":
                self.send_response(404)
                self.end_headers()
                return

            body = json.dumps(jwks).encode("utf-8")
            self.send_response(200)
            self.send_header("Content-Type", "application/json")
            self.send_header("Content-Length", str(len(body)))
            self.end_headers()
            self.wfile.write(body)

        def log_message(self, format, *args):  # pragma: no cover - quiet server
            return

    return Handler


async def main() -> None:
    jwks = {
        "keys": [
            {
                "kty": "oct",
                "kid": KEY_ID,
                "k": base64url_encode(SECRET).decode("ascii"),
                "alg": "HS256",
            }
        ]
    }

    server = ThreadingHTTPServer(("127.0.0.1", 0), make_handler(jwks))
    thread = threading.Thread(target=server.serve_forever, daemon=True)
    thread.start()

    try:
        issuer = "https://issuer.example.com"
        jwks_url = f"http://127.0.0.1:{server.server_address[1]}/jwks.json"

        service = RemoteOIDCTokenService(
            issuer=issuer,
            jwks_url=jwks_url,
            expected_alg_whitelist=("HS256",),
        )

        now = int(time.time())
        token = jwt.encode(
            {
                "iss": issuer,
                "aud": "my-audience",
                "sub": "user-123",
                "iat": now,
                "exp": now + 60,
            },
            SECRET,
            algorithm="HS256",
            headers={"kid": KEY_ID},
        )

        service.refresh(force=True)
        claims = await service.verify(token, audience="my-audience")
        print(f"Verified subject: {claims['sub']}")
    finally:
        server.shutdown()
        thread.join()


if __name__ == "__main__":
    asyncio.run(main())

The service performs JWKS discovery or fetch, validates the token signature and issuer, and returns the decoded claims when verification succeeds. Cache entries refresh automatically based on cache_ttl_s or manually via refresh(force=True).

Want to help?

If you want to contribute to swarmauri-sdk, read up on our guidelines for contributing that will help you get started.