ENG-10376 docs: add enterprise auth audit hook page

docs/app/reflex_docs/templates/docpage/sidebar/sidebar_items/enterprise.py

@@ -53,6 +53,10 @@ def get_sidebar_items_enterprise_usage():
                     names="Customizing the Auth Pages",
                     link=enterprise.auth.custom_pages.path,
                 ),
+                SideBarItem(
+                    names="Auditing Auth Actions",
+                    link=enterprise.auth.audit.path,
+                ),
                 SideBarItem(
                     names="Testing Guarded Code",
                     link=enterprise.auth.testing.path,

docs/enterprise/auth/audit.md

@@ -0,0 +1,179 @@
+---
+title: Auditing Auth Actions
+---
+
+_New in reflex-enterprise v0.9.3._
+
+# Auditing Auth Actions
+
+`rxe.AuthPlugin(audit=...)` registers a single observe-only hook that is called
+for every auth lifecycle action (login, logout, token refresh, session expiry)
+and every access decision the plugin makes on your behalf (the per-event gate
+and the page guard). Use it to feed a SIEM, an audit table, or a structured
+log — anywhere "who did what, and was it allowed" needs to be recorded.
+
+```python
+# rxconfig.py
+import reflex_enterprise as rxe
+
+config = rxe.Config(
+    app_name="my_app",
+    plugins=[
+        rxe.AuthPlugin(
+            audit="my_app.audit.audit_auth",
+        ),
+    ],
+)
+```
+
+```python
+# my_app/audit.py
+import logging
+
+audit_logger = logging.getLogger("my_app.audit")
+
+
+async def audit_auth(action, outcome, context) -> None:
+    claims = context.userinfo or {}
+    audit_logger.info(
+        "%s %s provider=%s route=%s reason=%s user=%s",
+        action.value,
+        outcome.value,
+        context.provider,
+        context.route,
+        context.reason,
+        claims.get("sub"),
+    )
+```
+
+Like `auth_providers` and the page builders, `audit=` accepts either the
+callable itself or a `"module.function"` import-path string. Use the string
+form in `rxconfig.py` — app modules cannot be imported while the config is
+still being assigned. The path is resolved at compile time, so a typo fails
+startup with a clear error rather than surfacing at the first audited event.
+
+## The hook contract
+
+The hook is called as `audit(action, outcome, context)`:
+
+- **Sync or async** — both are accepted; an awaitable result is awaited.
+- **Observe-only** — the return value is ignored. The hook can never veto or
+  alter a decision; authorization semantics stay in the `auth=` checks.
+- **Fail-open** — a raising hook is logged at `ERROR` (with traceback) and the
+  auth flow proceeds unaffected.
+- **Awaited inline** — events for a session arrive in causal order, but the
+  hook runs on the hot path. Keep it fast; heavy sinks (HTTP, database) should
+  enqueue internally and flush out-of-band, projecting the context down to the
+  plain fields they need first.
+
+`AuditAction` and `AuditOutcome` are str-valued enums and `AuditContext` is a
+flat frozen dataclass, so events serialize into log/JSON sinks without
+importing framework internals. Always read `.value` when formatting: on
+Python 3.11+ `f"{action}"` renders `AuditAction.LOGIN_COMPLETED` while 3.10
+renders the bare value.
+
+## Actions and outcomes
+
+Lifecycle actions record the user interacting with the plugin:
+
+| Action | Emitted when | Outcomes |
+| --- | --- | --- |
+| `login_started` | The authorization redirect to the IdP is issued. | `success` / `failure` |
+| `login_completed` | The callback token exchange finishes (or fails). | `success` / `failure` |
+| `logout` | The session is cleared — user logout, popup sync, or stale-identity cleanup. | `success` / `failure` |
+| `token_refresh` | An access-token refresh exchange completes (or is rejected). | `success` / `failure` |
+| `session_expired` | A session dies without a logout: invalid tokens, rejected userinfo, or cookies that expired out-of-band. | `success` |
+
+Access decisions record every allow/deny the plugin makes, phrased as what the
+user experienced:
+
+| Action | Surface | Outcomes |
+| --- | --- | --- |
+| `event_handler` | The per-event gate on protected event handlers. | `allowed` / `redirected_to_login` / `denied_toast` |
+| `page_load` | The page guard on protected pages. | `allowed` / `redirected_to_login` / `redirected_to_forbidden` |
+
+Public surfaces are not audited: an explicit `auth=False` handler, a public
+page under an `auth=False` default, and framework events like `hydrate` emit
+nothing — auditing "everything is public and allowed" would flood the sink.
+Field and computed-var withholding (delta filtering and redelivery) is also
+not audited; those derive from the same identity the gate and guard decisions
+already recorded.
+
+On failures, `context.reason` carries a machine-readable cause — for example
+`"csrf_state_mismatch"`, `"token_exchange_failed"`, `"refresh_failed"`,
+`"tokens_invalid"`, or `"stale_cookies"` — and `context.error_txid` matches
+the error transaction id in the provider's backend logs and error UI.
+
+## The context
+
+`AuditContext` is frozen and keyword-only; new optional fields may be added
+over time, but the 3-argument hook signature never changes.
+
+| Field | Meaning |
+| --- | --- |
+| `state` | The state instance the audited flow ran on — always present, and the door into app state via `await context.state.get_state(...)`. |
+| `auth_user_state` | The live per-token `AuthUserState` handle, or `None` if it could not be loaded. |
+| `userinfo` | A claims snapshot at emission time. Emissions adjacent to a session reset (logout, expiry) capture it *before* the reset, so the event still records who logged out. |
+| `provider` | The involved provider's name, when known. |
+| `route` | The current page URL, when available. |
+| `session_id` | The router session id, when available. |
+| `handler_name` | The gated handler's function name (`event_handler` action only). |
+| `event_handler` | The gated `EventHandler` object (`event_handler` action only). |
+| `payload` | The gated event's payload, verbatim (`event_handler` action only). |
+| `reason` | Machine-readable cause, e.g. `"refresh_failed"`. |
+| `error_txid` | Correlates with the provider's backend error logs. |
+| `timestamp` | `time.time()` at emission. |
+
+```md alert warning
+# Redaction is the hook's responsibility
+`payload` carries the gated event's arguments verbatim (form input, possibly
+secrets) and `userinfo` carries the full IdP claims (PII). Project to the
+fields your sink needs — log `sub`, not the whole claims dict.
+```
+
+## Writing audit events into app state
+
+`context.state` works exactly like `self` in an event handler: reach any
+state via `get_state`. This trail state is deliberately public (`auth=False`)
+so denial events recorded while anonymous still render after the redirect:
+
+```python
+import reflex as rx
+import reflex_enterprise as rxe
+
+
+class AuditTrailState(rx.State):
+    entries: rx.Field[list[dict[str, str]]] = rxe.field([], auth=False)
+
+
+async def audit_auth(action, outcome, context) -> None:
+    trail = await context.state.get_state(AuditTrailState)
+    trail.entries = [
+        *trail.entries[-29:],
+        {"action": action.value, "outcome": outcome.value},
+    ]
+```
+
+Entries ride along with the next state delta, so a decision made while a
+redirect is in flight (a gate-blocked event, for example) shows up once the
+visitor lands back on a page.
+
+## Volume
+
+`event_handler`/`allowed` is the highest-frequency emission: it fires once per
+protected handler per event, so a busy app records a lot of "allowed". Hooks
+that only care about denials or lifecycle events should filter on
+action/outcome first, before doing any I/O.
+
+## Popup flows
+
+Popup login/logout emits for both windows' sessions: the popup window's own
+session records the provider round-trip (`login_started`, `login_completed`),
+and the opener's session records the token handoff — `login_completed` with
+reason `"popup_tokens_synced"`, `logout` with reason `"popup_logout_synced"`.
+Hooks counting unique logins should key on one side of the pair; identity
+(`userinfo`) is most complete on the opener's events.
+
+See the [overview](/docs/enterprise/auth/overview/) for how the plugin fits
+together, and [secure by default](/docs/enterprise/auth/secure-by-default/)
+for the `auth=` checks whose decisions these events record.

docs/enterprise/overview.md

@@ -64,7 +64,7 @@ categories_data = [
     {
         "category": "Authentication",
         "description": "OIDC authentication with a secure-by-default model",
-        "count": 6,
+        "count": 7,
         "components": [
             {
                 "feature": "AuthPlugin",
@@ -94,6 +94,13 @@ categories_data = [
                 "self_hosted_tier": "Enterprise",
                 "link": "/enterprise/auth/custom-pages",
             },
+            {
+                "feature": "Audit Hook",
+                "description": "One observe-only callable receives every auth action and access decision",
+                "cloud_tier": "Enterprise",
+                "self_hosted_tier": "Enterprise",
+                "link": "/enterprise/auth/audit",
+            },
             {
                 "feature": "Testing",
                 "description": "Unit-test authorization checks and exercise the full OIDC flow against a mock IdP",