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62"""Structured ``auth_event`` log emitter.
Operators query CloudWatch Logs Insights / Logfire by ``category="auth_event"``
to get a clean login/logout timeline without standing up a separate audit
store. Failure reasons are categorical (``invalid_password``,
``unknown_user``, ``provider_error``) — never the username attempted, never
the password hash, never PII.
"""
from __future__ import annotations
import logging
from typing import Literal
logger = logging.getLogger(__name__)
AuthEvent = Literal[
"login_success",
"login_failure",
"logout",
"session_expired",
"session_invalid",
]
FailureReason = Literal[
"unknown_user",
"invalid_password",
"csrf_mismatch",
"provider_error",
"missing_credentials",
"rate_limited",
]
def emit(
event: AuthEvent,
*,
provider_id: str,
sub: str | None = None,
reason: FailureReason | None = None,
client_ip: str | None = None,
) -> None:
"""Emit a structured auth event.
Uses ``logger.info`` for success/logout and ``logger.warning`` for
failures so default log filters don't drop signal-of-attack events.
The ``extra`` dict carries the structured fields; Logfire and OTel
pick them up automatically when enabled.
"""
extra = {
"category": "auth_event",
"auth_event": event,
"provider_id": provider_id,
"sub": sub,
"reason": reason,
"client_ip": client_ip,
}
if event in ("login_failure", "session_invalid"):
logger.warning("auth_event: %s (%s)", event, reason or "unspecified", extra=extra)
else:
logger.info("auth_event: %s", event, extra=extra)