Python

pip install "au1h[fastapi]"

from fastapi import Depends, FastAPI
from au1h import User, Verifier
from au1h.fastapi import require_user, require_proxy

au1h = Verifier("https://auth.example.com", "todo")
current_user = require_user(au1h)

app = FastAPI()

@app.get("/api/me")
def me(user: User = Depends(current_user)):
    return user                     # id, email, name, application_id

proxied = require_proxy(au1h)       # verifies x-au1h-token; pass None to skip

@app.get("/todos")
def todos(ctx = Depends(proxied)):
    return {"user": ctx.user.id, "app": ctx.app_slug}

from au1h import Verifier, AuthError, read_proxy_context

claims = au1h.verify(token)                               # dict of claims
claims = au1h.verify_authorization(headers.get("authorization"))
user = au1h.user(token)                                   # User dataclass
ctx = read_proxy_context(headers)                         # ProxyContext | None

from au1h import ServerClient

s2s = ServerClient("https://auth.example.com", "todo", os.environ["AU1H_APP_SECRET"])
s2s.me()                       # {"id": ..., "slug": ...}
s2s.introspect(token)          # Introspection(active, via, user, expires_at)