onehux-sso

A real, installable Django app wrapping OneHux Accounts' Authorization Code + PKCE flow against its real hosted login page — formalizing what the Django integration guide otherwise only shows as copy-paste example code.

Install

pip install onehux-sso

pypi.org/project/onehux-sso

Two hosts — don't mix them up

accounts.onehux.com serves the hosted login/logout pages a browser is redirected to. api-accounts.onehux.com serves the actual OAuth API your backend calls server-to-server. This package keeps them as two separate settings (LOGIN_BASE_URL / API_BASE_URL) precisely because collapsing them into one host was a real, confirmed bug in the original integration guides (see the backend repo's README.md, ADR-070) — the wrong host doesn't error loudly, it silently 404s.

If your Organization has a live custom domain (Dashboard → Settings → Branding, see the backend repo's README.md ADR-027), set LOGIN_BASE_URL to that domain instead — it's what your end users' browsers actually land on, so it should match whatever you've branded. Never override API_BASE_URL: it has no per-Organization customization and never needs any — every call there is server-to-server via your client_id/client_secret, never seen by an end user.

Setup

1. Register a real confidential-client Application in your OneHux Accounts Organization (Dashboard → Applications), with a redirect_uri pointing at wherever you mount this package's callback/ URL, and your post_logout_redirect_uri registered in that same list — OneHux Accounts validates both against the one redirect_uris list, not two separate ones.

2. Add to INSTALLED_APPS:

   INSTALLED_APPS = [
       ...,
       "onehux_sso",
   ]
   

3. Add the settings block:

   ONEHUX_SSO = {
       "CLIENT_ID": "onehux_client_...",
       "CLIENT_SECRET": "onehux_secret_...",
       "REDIRECT_URI": "https://yourapp.example.com/auth/callback/",
       "POST_LOGOUT_REDIRECT_URI": "https://yourapp.example.com/auth/logged-out/",
       # LOGIN_BASE_URL / API_BASE_URL below are optional — they default to this platform's
       # own shared production hosts (see conf.py), the same for every integrator unless your
       # Organization has a custom domain (Dashboard → Settings → Branding). Set them only to
       # override that, e.g.:
       # "LOGIN_BASE_URL": "https://your-org.onehux.com",
       # "API_BASE_URL": "https://api.your-domain.com",
       "SCOPE": "openid profile email",
       "LOGIN_SUCCESS_REDIRECT": "/",
       "LOGOUT_SUCCESS_REDIRECT": "/",
       "SESSION_ACCESS_TOKEN_KEY": "onehux_access_token",
   }
   

4. Wire the URLs:

   # yourproject/urls.py
   from django.urls import include, path
   
   urlpatterns = [
       ...,
       path("auth/", include("onehux_sso.urls")),
   ]
   

This gives you four real, working endpoints: /auth/login/, /auth/callback/, /auth/logout/, and /auth/userinfo/ (a ready-to-use JSON endpoint your own frontend can call with credentials: 'include', matching the BFF pattern — your frontend never talks to OneHux directly).

Using the client directly

If you'd rather wire your own views instead of using the ones above:

from onehux_sso import OneHuxClient, TokenExpiredError

client = OneHuxClient.from_settings()

pending = client.start_authorization()
# stash pending.state / pending.code_verifier in request.session, then:
# return HttpResponseRedirect(pending.authorization_url)

tokens = client.exchange_code(
    code=request.GET["code"],
    state=request.GET["state"],
    expected_state=request.session["onehux_sso_state"],
    code_verifier=request.session["onehux_sso_pkce_verifier"],
)
# tokens.refresh_token: persist it server-side alongside tokens.access_token if you're not
# using UserInfoView / onehux_login_required (both already do this for you) — see "Refresh
# tokens" below.

try:
    claims = client.get_userinfo(access_token=tokens.access_token)
except TokenExpiredError:
    # get_userinfo() never retries itself (it's a pure API call, no session concept) — a
    # caller using OneHuxClient directly owns this retry, same as UserInfoView and
    # onehux_login_required do internally. See "Refresh tokens" below.
    refreshed = client.refresh_access_token(refresh_token=request.session["onehux_sso_refresh_token"])
    request.session["onehux_sso_refresh_token"] = refreshed.refresh_token  # rotated — persist the new one
    claims = client.get_userinfo(access_token=refreshed.access_token)

logout_url = client.build_logout_url()

Public application launcher

GET /api/v1/organizations/{org_slug}/public-applications/ is a real, public, unauthenticated platform endpoint — no client_id/client_secret involved, usable for any Organization by its own slug, not just your own configured one. It returns only name/logo_url/home_url for Applications that Organization has opted into public listing — a pure "what can I launch" list, never a way to start a sign-in flow.

apps = client.get_public_applications(org_slug="onehux")
# [PublicApplication(name="ODS", logo_url="https://...", home_url="https://...")]

Rendering is entirely up to you — this package ships the data method only, no template or component. A plain, unstyled illustration (adapt this to your own design, don't copy it as-is):

{% for app in public_applications %}
  <a href="{{ app.home_url }}">
    <img src="{{ app.logo_url }}" alt="{{ app.name }}">
    {{ app.name }}
  </a>
{% endfor %}

Logging out — what actually happens, and how to hear about it immediately

Two distinct logout paths reach the platform's identical underlying session-revocation call (POST /api/v1/sessions/me/logout/), and OneHux Accounts genuinely, immediately revokes the platform-wide session either way — this was traced directly against the backend, not assumed. What differs is how this app finds out:

• RP-initiated logout — the user clicks "log out" inside this app itself (client.build_logout_url() / /auth/logout/). This app already knows: it's the one that cleared request.session[SESSION_ACCESS_TOKEN_KEY] and drove the redirect. Nothing further to do.
• IdP-initiated logout — the user logs out of a different app, or directly at accounts.onehux.com/dashboard. The platform-wide session is revoked immediately and correctly, exactly the same as the RP-initiated case — but this app only finds out if it's listening for it.

OneHux Accounts implements real OIDC Back-Channel Logout (spec: openid-connect-backchannel-1_0) to close that gap: BackchannelLogoutView receives a signed logout_token POST the instant any session tied to this app is revoked, anywhere, and clears the matching local Django session immediately — not on the next stale /userinfo call.

To turn this on:

1. Mount the package's URLs as shown in Setup above — BackchannelLogoutView is already included at /auth/backchannel-logout/ (adjust for whatever prefix you mounted at).
2. Register that exact URL with OneHux:

   PATCH /api/v1/applications/{id}/backchannel-logout/
   { "backchannel_logout_uri": "https://yourapp.example.com/auth/backchannel-logout/" }
   

   The response includes backchannel_logout_secret exactly once — this is a dedicated signing secret, deliberately not your CLIENT_SECRET (the backend stores that only as a one-way hash and can never read it back to sign anything with it).
3. Set ONEHUX_SSO['BACKCHANNEL_LOGOUT_SIGNING_SECRET'] to that value.

Without steps 1–3, IdP-initiated logout is still real and immediate at the platform level — this app just won't hear about it until its own next /userinfo call fails with TokenExpiredError, bounded by the access token's 15-minute lifetime. With them wired up, both logout paths are functionally immediate from this app's point of view too.

Refresh tokens

OneHux Accounts access tokens are a 15-minute, single-issue lifetime — that hasn't changed. What has: every real login now also issues a refresh token (backend repo README.md ADR-081, RFC 6749 §6 / RFC 9700 §4.14.2 rotation with reuse detection), which this package uses to renew an expired access token without a full re-login.

UserInfoView (GET /auth/userinfo/) and the onehux_login_required decorator / OneHuxLoginRequiredMixin (see "Protecting your own views" below) do this automatically: an expired access token triggers exactly one silent client.refresh_access_token() call using the session's stored refresh token, and the caller only ever sees TokenExpiredError if that refresh also fails. The new access/refresh token pair is persisted back into the session, replacing the old one — a refresh token is single-use and rotates on every real use, the old value stops working the moment a new one is issued.

onehux_sso.TokenExpiredError is still the error you catch, but its meaning is now "not signed in, full stop" rather than "the 15-minute access token died" — it's raised only once a refresh has already been attempted and failed too (or no refresh token was ever stored, e.g. a session from before this package version). In every one of those cases, catch it and send the user back through client.start_authorization() for a fresh login. The backend deliberately does not tell this package why a refresh failed — ordinary expiry, an already-rotated token being replayed (a real reuse/compromise signal), or the underlying session being revoked all produce the same generic rejection (RFC 9700 §4.14.2's own reasoning: the server can't tell which party presented the stale token) — so this package has nothing more specific to offer a caller than "not valid anymore."

If you call client.get_userinfo() yourself outside of UserInfoView/the decorator/the mixin (see "Using the client directly" above), it never retries on your behalf — it's a pure API call with no session concept. Catch TokenExpiredError, call client.refresh_access_token() yourself if you have a stored refresh token, persist the newly-rotated one, and retry once.

Public clients (a future mobile/desktop SDK, no client_secret) get tighter refresh-token settings than this package's confidential-client model (7-day idle timeout / 14-day absolute lifetime vs. 30/30 here) — not relevant to this package today, but worth knowing the number "30 days" below isn't a platform-wide constant.

Protecting your own views — onehux_login_required / OneHuxLoginRequiredMixin

UserInfoView and this package's own example app both catch TokenExpiredError themselves, but if you're wiring up your own protected views (as the "Using the client directly" section above shows), you have to catch it yourself every single time — miss it once and an expired token becomes an unhandled exception (a real 500) instead of a clean redirect back to sign-in.

onehux_login_required (function views) and OneHuxLoginRequiredMixin (class-based views) close that gap: both redirect to /auth/login/?next=<original path> if there's no access token in the session yet, and catch TokenExpiredError raised anywhere during the view's execution. On that error, both now attempt one silent refresh (see "Refresh tokens" above) using the session's stored refresh token first — success redirects back to the same URL (a fresh GET re-runs your view with a valid session, rather than re-invoking your view function in-process, which this package doesn't control and can't assume is safe to run twice); failure (or no refresh token stored) clears the dead access token and redirects to /auth/login/ exactly as before this feature existed.

from onehux_sso import OneHuxClient, onehux_login_required
from onehux_sso.conf import get_setting

@onehux_login_required
def dashboard(request):
    client = OneHuxClient.from_settings()
    access_token = request.session[get_setting("SESSION_ACCESS_TOKEN_KEY")]
    claims = client.get_userinfo(access_token=access_token)  # TokenExpiredError -> refresh-and-retry, or redirect
    ...

from django.views import View
from onehux_sso import OneHuxClient, OneHuxLoginRequiredMixin
from onehux_sso.conf import get_setting

class DashboardView(OneHuxLoginRequiredMixin, View):  # mixin first, before View
    def get(self, request):
        client = OneHuxClient.from_settings()
        access_token = request.session[get_setting("SESSION_ACCESS_TOKEN_KEY")]
        claims = client.get_userinfo(access_token=access_token)
        ...

Your Django session cookie lifetime vs. the access token

This package never sets SESSION_COOKIE_AGE — it relies entirely on whatever your own Django project has configured (Django's own default is 2 weeks). That's deliberate: session cookie lifetime is your project's own call to make, not something an SSO client should override out from under you. The two lifetimes are still independent, but "how long is the user actually signed in" is no longer a flat 15 minutes either: UserInfoView and onehux_login_required/OneHuxLoginRequiredMixin now silently refresh an expired access token using the stored refresh token (see "Refresh tokens" above), so a signed-in user's real session length is bounded by the refresh token's own lifetime (30 days for a confidential client like this one; see the backend repo's README.md ADR-081) — not by the access token's 15 minutes, and also not by SESSION_COOKIE_AGE. If your cookie outlives the refresh token itself, the cookie will still exist but TokenExpiredError will eventually fire anyway once the refresh token itself expires or is rejected — that's still real and still possible, just on a longer, rotation-extended clock instead of a flat 15 minutes. Don't build any logic that assumes "the user has a session cookie" implies "the user has a valid access token" — always call client.get_userinfo() (directly, or via the protection helpers above) to find out, and treat TokenExpiredError as the real source of truth.

Example project

See example/ for a complete, runnable Django project using this package end-to-end — registered against a real disposable test Application and actually run through the full browser flow against production, not just unit-tested in isolation.

License

Apache License 2.0 — see LICENSE.