ubag (Python)
UBAG Web Layer — agent identity and routing at the web edge. FastAPI / Starlette middleware.
When an autonomous agent visits a website, UBAG verifies who it is and routes accordingly: humans to your normal site, credentialed agents to clean JSON-LD, unknown bots to a cryptographic challenge. Asymmetric by design — agent identity is an Ed25519 keypair; credentials are ES256 JWTs verifiable via JWKS, no shared secrets.
Early but real, pre-1.0, unaudited. See the full README and SECURITY.md.
Install
pip install "ubag[fastapi]"
Quick start
from fastapi import FastAPI
from ubag import UBAGMiddleware, generate_issuer_keypair
issuer_private, _ = generate_issuer_keypair() # EC P-256 (ES256)
app = FastAPI()
app.add_middleware(
UBAGMiddleware,
origin="https://yoursite.com",
issuer_key=issuer_private, # mints + verifies credentials
# site_meta is OPTIONAL — Branch B auto-extracts structured data from your
# origin's HTML (JSON-LD/OpenGraph/meta). Pass site_meta only to override.
)
Your site now serves credentialed agents auto-extracted JSON-LD plus a labeled
Markdown content layer (no hand-written metadata), proxies humans to your origin,
challenges unknown bots, exposes /.well-known/ubag.json for discovery, and
serves its issuer key as JWKS at /.well-known/jwks.json. Credentials are
holder-of-key: agents attach a per-request proof-of-possession via
agent.headers(method, path).
A Node/Express SDK with an identical, cross-verifiable wire format is in the same repo. Full docs, a runnable demo, and the protocol details: https://github.com/mohameduk/Ubag_protocol
MIT licensed.
1 maintainer
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