incorta-auth (Python)

Authenticate Incorta users in Python apps. The Python port of @incorta/auth — it gates your app behind the real Incorta login (no custom login page) using the OAuth 2.0 / OIDC authorization server built into Incorta.

Both SDKs implement one spec: the same OAuth authorization-code flow against {INCORTA_URL}/oauth/{tenant}, the same INCORTA_* configuration, and the same encrypted-cookie sealing (compact JWE, dir + A256GCM, key derived SHA-256("incorta-auth:" + secret)) — cookies sealed by either language unseal in the other, verified by fixtures generated with the TS implementation (tests/fixtures/).

Status

• Core protocol layer: configuration, endpoint discovery with split-horizon support, authorization-code exchange, silent refresh with rotation, RS256/JWKS token verification, session sealing, and RFC 7591/7592 client registration as library functions.
• ASGI / FastAPI adapter: IncortaAuthMiddleware gates any ASGI app behind Incorta login and serves /auth/*; incorta_auth.fastapi provides the get_session dependency. See examples/fastapi.
• Streamlit adapter: incorta_auth.streamlit.gate() gates a Streamlit app (which has no routes and no response-cookie control) behind Incorta login. See examples/streamlit and the design notes below.

Usage (FastAPI / any ASGI app)

from fastapi import Depends, FastAPI
from incorta_auth import AuthSession
from incorta_auth.asgi import IncortaAuthMiddleware
from incorta_auth.fastapi import get_session

app = FastAPI()
app.add_middleware(IncortaAuthMiddleware)  # config from INCORTA_* env vars

@app.get("/api/me")
def me(session: AuthSession = Depends(get_session)):
    return {"user": session.user.sub, "roles": session.user.roles}
    # session.access_token → Authorization: Bearer for Incorta REST APIs

The middleware serves {base_path}/{login,callback,session,logout,signed-out} (+ /token when expose_access_token=True), attaches the session to request.state.incorta_auth, redirects signed-out browser navigations into Incorta login (relative Location — proxy-safe), 401s signed-out data requests, refuses signed-out websockets, and answers everything with an honest 503 while the INCORTA_* env is missing. public_paths=("/api/health",) exempts liveness probes from both the gate and the 503. For apps embedded in a cross-site iframe, spread embedded_cookie_config() into the middleware (SameSite=None + Partitioned).

Embedded (cross-site iframe) sign-in

When the app is previewed inside a cross-site iframe and the Incorta cluster has iframe inclusion off (the default — Incorta's login is X-Frame-Options: SAMEORIGIN and its session cookie is SameSite=Lax), a signed-out user can't complete Incorta login inside the frame. Pass embedded_sign_in="new-tab" (or INCORTA_EMBEDDED_SIGN_IN=new-tab) and the gate serves a small interstitial instead of a doomed in-frame redirect: at the top level it still redirects straight to Incorta; inside a frame it offers a "Sign in with Incorta" button that opens the app in a new top-level tab, where login works. The proper fix remains enabling iframe inclusion on the cluster — this is the graceful fallback when you can't.

Install

uv add incorta-auth        # or: pip install incorta-auth

Prerequisites

Same as the TS SDK (see the repo README): enable the authorization server on the cluster, then register an OAuth client. The registration CLI ships with the npm package —

npx incorta-auth register \
  --url http://localhost:8080/incorta \
  --tenant demo \
  --name "My App" \
  --redirect http://localhost:4000/auth/callback

— or use the library functions below from Python.

Usage (core)

Configuration comes from INCORTA_* env vars (INCORTA_URL, INCORTA_TENANT, INCORTA_CLIENT_ID, INCORTA_CLIENT_SECRET, INCORTA_AUTH_SECRET, optional INCORTA_APP_URL / INCORTA_INTERNAL_URL / INCORTA_COOKIE_SAMESITE / INCORTA_COOKIE_PARTITIONED) or explicit keyword arguments:

from incorta_auth import IncortaAuth

auth = IncortaAuth()  # reads INCORTA_* env vars

# Send the browser to Incorta login:
login = auth.begin_login(origin="http://localhost:4000", secure=False, redirect_to="/")
# → redirect to login.location, set login.set_cookies

# Complete the callback (?code&state):
result = auth.complete_callback(
    origin="http://localhost:4000", secure=False,
    cookie_header=request_cookie_header, query=dict(query_params),
)
# → redirect to result.location, set result.set_cookies

# Gate requests / read the user and token:
session = auth.get_session(request_cookie_header)
if session:
    session.user.sub, session.user.roles, session.access_token

# Refresh-aware load (rotates the refresh token, slides the session cookie):
loaded = auth.load_session(cookie_header=request_cookie_header, secure=False)

Client registration (RFC 7591/7592):

from incorta_auth import register_client, get_client, update_client_redirect_uris, delete_client

client = register_client(
    incorta_url="http://localhost:8080/incorta", tenant="demo",
    name="My App", redirect_uris=["http://localhost:4000/auth/callback"],
)

Usage (Streamlit)

import streamlit as st
import incorta_auth.streamlit as incorta

user = incorta.gate()        # first line of the entry script; st.stop()s until signed in
st.write(f"Hello {user.name}", user.roles)
incorta.access_token()        # Bearer for Incorta REST APIs (auto-refreshed)
if st.button("Sign out"):
    incorta.sign_out()        # interstitial — SSO would otherwise bounce right back in

The OAuth redirect_uri is the app root ({INCORTA_APP_URL}/) — register exactly that. Tokens live only in st.session_state; a hard refresh silently re-authenticates through Incorta SSO. Multi-page entry scripts can restore the originally requested page with pop_return_path().

For an app embedded in a cross-site iframe on a cluster with iframe inclusion off, pass gate(embedded_sign_in="new-tab") (or INCORTA_EMBEDDED_SIGN_IN=new-tab): signed out, the gate shows a "Sign in with Incorta" button that opens the app in a new top-level tab (where login works) instead of bouncing the frame to an Incorta login it can't render — see the ASGI section's note above.

Streamlit design notes (browser-spike findings, 2026-07-20)

Streamlit cannot host a callback route, set response cookies, or (it turns out) navigate from component JS — the flow is built from the three vehicles a real-browser spike (Playwright, Streamlit 1.59) validated:

1. Navigation: components.html iframes are sandboxed allow-same-origin allow-scripts … without allow-top-navigation, so JS cannot redirect the app. st.html strips both scripts and meta tags (DOMPurify). The one silent vehicle is a st.markdown(unsafe_allow_html=True) meta-refresh, which navigates the app frame itself — allowed everywhere, including inside iframes.
2. State cookie: components.html JS can write cookies on the app origin (allow-same-origin + srcdoc). The sealed login state (state/nonce/return target, same JWE sealing as the TS SDK's state cookie) is written in two variants — SameSite=Lax for top-level tabs and SameSite=None; Secure; Partitioned for cross-site iframes (the Incorta builder preview; verified in a genuine cross-site embed) — and read back after the round-trip via st.context.cookies.
3. Ordering: the cookie write reliably precedes the meta navigation (5/5 in the spike) — both are same-turn DOM operations and the srcdoc iframe has no network dependency. Binding is strict: a missing state cookie fails the callback with state_missing (the same failure a cookie-blocked browser gets from the TS SDK) and offers a retry button.

Compatibility note: the meta-refresh passthrough and the component sandbox flags are Streamlit implementation details — the full flow is pinned by a browser e2e and the AppTest suite, so a Streamlit upgrade that changes either fails loudly, not silently.

Development

uv sync
uv run pytest
uv run ruff check . && uv run ruff format --check .
uv run mypy

The test suite runs against an in-process replica of Incorta's authorization server (tests/mock_incorta.py, a port of the TS suite's mock-incorta.ts) served through httpx.MockTransport — one-time 60s codes, rotating refresh tokens, and split-horizon simulation included. Regenerate the cross-language sealing fixtures with:

node tests/fixtures/generate-fixtures.mjs > tests/fixtures/sealed-fixtures.json