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Log Secrets Manager failures in web UI auth token fetch

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The web UI auth gate correctly fails closed when the shared token
cannot be read, but _get_auth_token() swallowed every exception
silently. A Secrets Manager permission or config error then made
every request 401 with no operational signal, leaving an outage
indistinguishable from ordinary unauthenticated traffic.

Add a module-level logger to both web_ui handlers and log the
fetch failure with logger.exception() in the except block before
returning None. Behavior is unchanged (still fails closed); the
failure is now visible in CloudWatch. The secret value is never
logged. The two handlers stay byte-consistent in the mirrored
_get_auth_token() region.

The companion finding on the CDK import of the shared
procurement-ingest/web-ui-auth-token secret was evaluated and left
as-is: the token is a single secret shared by both the PO and WO
stacks, so from_secret_name_v2 (which scopes grant_read via the
standard 6-char suffix wildcard) is correct; making it a CDK-managed
Secret in both stacks would collide the two stacks on the same
explicit secret name at deploy time.

Refs: INFRA-74
This commit is contained in:
Adam Moussa 2026-07-15 19:43:36 -04:00
parent 2802d04368
commit 2c2cfcc538
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2 changed files with 24 additions and 0 deletions
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12
lambdas/po/web_ui/handler.py
View file

@ -7,6 +7,7 @@ Accessed via Lambda Function URL.
import hmac
import json
import logging
import os
import time
from decimal import Decimal
@ -14,6 +15,9 @@ from html import escape as esc
import boto3
logger = logging.getLogger()
logger.setLevel(logging.INFO)
dynamodb = boto3.resource("dynamodb")
PO_TABLE = os.environ.get("PO_TABLE", "purchase-orders")
@ -58,6 +62,14 @@ def _get_auth_token() -> str | None:
_auth_token_cached_at = now
return _auth_token_cache
except Exception:
# Fail closed (return None -> caller 401s) but surface the failure: a
# Secrets Manager permission/config error would otherwise make every
# request 401 with no operational signal. The secret value is never
# logged.
logger.exception(
"Failed to fetch web UI auth token from Secrets Manager; "
"denying request (failing closed)"
)
return None

12
lambdas/wo/web_ui/handler.py
View file

@ -7,12 +7,16 @@ Accessed via Lambda Function URL.
import hmac
import json
import logging
import os
import time
from html import escape as esc
import boto3
logger = logging.getLogger()
logger.setLevel(logging.INFO)
dynamodb = boto3.resource("dynamodb")
WORK_ORDERS_TABLE = os.environ.get("WORK_ORDERS_TABLE", "WorkOrders")
@ -57,6 +61,14 @@ def _get_auth_token() -> str | None:
_auth_token_cached_at = now
return _auth_token_cache
except Exception:
# Fail closed (return None -> caller 401s) but surface the failure: a
# Secrets Manager permission/config error would otherwise make every
# request 401 with no operational signal. The secret value is never
# logged.
logger.exception(
"Failed to fetch web UI auth token from Secrets Manager; "
"denying request (failing closed)"
)
return None