Fix close-form weekday guard and SSM auth fail-open

- Close form guard: check weekday == 3 (Thursday), not 4 (Friday) — the
  crons fire at Thursday 11:59 PM ET, when weekday() is 3
- SSM fail-closed: separate _google_auth_configured() (checks env var) from
  _get_google_client_id() (fetches value). If auth is configured but the SSM
  fetch fails, return 503 instead of silently falling back to manual auth
- Update close_form tests to use Thursday dates
- Add test_ssm_failure_fails_closed

functions/close_form/handler.py

@@ -13,10 +13,10 @@ EASTERN = ZoneInfo("America/New_York")
 
 def lambda_handler(event, context):
     now_et = datetime.now(EASTERN)
-    if not (now_et.weekday() == 4 and now_et.hour >= 23):
+    if not (now_et.weekday() == 3 and now_et.hour >= 23):
         return {
             "status": "skipped",
-            "reason": "outside close window (must be Friday >= 11 PM ET)",
+            "reason": "outside close window (must be Thursday >= 11 PM ET)",
         }
 
     week = event.get("week", current_week())

functions/submit_order/handler.py

@@ -50,19 +50,17 @@ def _get_discount_settings() -> tuple[Decimal, Decimal]:
     return _settings
 
 
+def _google_auth_configured() -> bool:
+    return bool(os.environ.get("GOOGLE_CLIENT_ID_PARAM", ""))
+
+
 def _get_google_client_id() -> str:
     global _google_client_id, _google_client_id_ts
     now = time.monotonic()
     if _google_client_id is None or (now - _google_client_id_ts) > CACHE_TTL_SECONDS:
         param = os.environ.get("GOOGLE_CLIENT_ID_PARAM", "")
         if param:
-            try:
+            _google_client_id = get_parameter(param, decrypt=False) or ""
-                _google_client_id = get_parameter(param, decrypt=False) or ""
-            except Exception as exc:
-                logger.warning(
-                    "Could not fetch Google client ID from SSM (%s): %s", param, exc
-                )
-                _google_client_id = ""
         else:
             _google_client_id = ""
         _google_client_id_ts = now
@@ -160,12 +158,24 @@ def handle_submit(event):
         return response(400, {"error": "Invalid JSON"})
 
     # --- Authentication ---
-    # If Google auth is configured, require a valid google_id_token.
+    # If Google auth is configured (SSM param name is set), require a valid
-    # Manual name/email fallback is only allowed when Google auth is NOT configured.
+    # google_id_token.  Manual fallback is only allowed when auth is NOT configured.
-    google_auth_enabled = bool(_get_google_client_id())
+    # If SSM fetch fails, fail closed (503) rather than silently disabling auth.
     google_token = body.get("google_id_token")
 
-    if google_auth_enabled:
+    if _google_auth_configured():
+        try:
+            client_id = _get_google_client_id()
+        except Exception as exc:
+            logger.error("SSM fetch failed for Google client ID: %s", exc)
+            return response(
+                503, {"error": "Authentication service temporarily unavailable"}
+            )
+        if not client_id:
+            logger.error("Google auth configured but client ID is empty")
+            return response(
+                503, {"error": "Authentication service temporarily unavailable"}
+            )
         if not google_token:
             return response(403, {"error": "Google authentication is required"})
         user_info, verify_status = _verify_google_token(google_token)

tests/test_close_form.py

@@ -32,33 +32,42 @@ def _make_datetime(year, month, day, hour, minute=0):
 
 class TestCloseFormGuard:
     @patch("close_form_handler.datetime")
-    def test_skipped_on_thursday(self, mock_dt):
+    def test_skipped_on_wednesday(self, mock_dt):
-        """Thursday 11pm ET -> skipped (not Friday)."""
+        """Wednesday 11pm ET -> skipped (not Thursday)."""
-        mock_dt.now.return_value = _make_datetime(2026, 5, 14, 23)  # Thursday
+        mock_dt.now.return_value = _make_datetime(2026, 5, 13, 23)  # Wednesday
 
         result = close_form_handler.lambda_handler({}, None)
 
         assert result["status"] == "skipped"
 
     @patch("close_form_handler.datetime")
-    def test_skipped_friday_before_11pm(self, mock_dt):
+    def test_skipped_on_friday(self, mock_dt):
-        """Friday 3am ET (UTC cron fires but too early) -> skipped."""
+        """Friday 3am ET (wrong-tz EDT cron during EST) -> skipped."""
         mock_dt.now.return_value = _make_datetime(2026, 5, 15, 3)  # Friday 3am
 
         result = close_form_handler.lambda_handler({}, None)
 
         assert result["status"] == "skipped"
 
+    @patch("close_form_handler.datetime")
+    def test_skipped_thursday_before_11pm(self, mock_dt):
+        """Thursday 10pm ET -> skipped (too early)."""
+        mock_dt.now.return_value = _make_datetime(2026, 5, 14, 22)  # Thursday 10pm
+
+        result = close_form_handler.lambda_handler({}, None)
+
+        assert result["status"] == "skipped"
+
     @patch("close_form_handler.set_form_status")
     @patch("close_form_handler.get_form_status", return_value="open")
     @patch("close_form_handler.current_week", return_value="2026-W19")
     @patch("close_form_handler._lambda")
     @patch("close_form_handler.datetime")
-    def test_runs_friday_at_11pm(
+    def test_runs_thursday_at_11pm(
         self, mock_dt, mock_lam, mock_week, mock_status, mock_set
     ):
-        """Friday 11pm ET -> proceeds to close."""
+        """Thursday 11pm ET -> proceeds to close."""
-        mock_dt.now.return_value = _make_datetime(2026, 5, 15, 23)  # Friday 11pm
+        mock_dt.now.return_value = _make_datetime(2026, 5, 14, 23)  # Thursday 11pm
 
         result = close_form_handler.lambda_handler({}, None)
 
@@ -70,31 +79,22 @@ class TestCloseFormGuard:
     @patch("close_form_handler.current_week", return_value="2026-W19")
     @patch("close_form_handler._lambda")
     @patch("close_form_handler.datetime")
-    def test_runs_friday_at_1159pm(
+    def test_runs_thursday_at_1159pm(
         self, mock_dt, mock_lam, mock_week, mock_status, mock_set
     ):
-        """Friday 11:59pm ET -> proceeds to close."""
+        """Thursday 11:59pm ET -> proceeds to close."""
-        mock_dt.now.return_value = _make_datetime(2026, 5, 15, 23, 59)
+        mock_dt.now.return_value = _make_datetime(2026, 5, 14, 23, 59)
 
         result = close_form_handler.lambda_handler({}, None)
 
         assert result["status"] == "closed"
 
-    @patch("close_form_handler.datetime")
-    def test_skipped_on_wednesday(self, mock_dt):
-        """Wednesday at any hour -> skipped."""
-        mock_dt.now.return_value = _make_datetime(2026, 5, 13, 23)
-
-        result = close_form_handler.lambda_handler({}, None)
-
-        assert result["status"] == "skipped"
-
     @patch("close_form_handler.get_form_status", return_value="closed")
     @patch("close_form_handler.current_week", return_value="2026-W19")
     @patch("close_form_handler.datetime")
     def test_already_closed(self, mock_dt, mock_week, mock_status):
-        """Friday 11pm but already closed -> returns already_closed."""
+        """Thursday 11pm but already closed -> returns already_closed."""
-        mock_dt.now.return_value = _make_datetime(2026, 5, 15, 23)
+        mock_dt.now.return_value = _make_datetime(2026, 5, 14, 23)
 
         result = close_form_handler.lambda_handler({}, None)
 

tests/test_submit_order.py

@@ -365,8 +365,16 @@ def test_total_summation_multiple_items(
 @patch(
     "submit_order_handler._get_google_client_id", return_value=VALID_GOOGLE_CLIENT_ID
 )
+@patch("submit_order_handler._google_auth_configured", return_value=True)
 def test_google_auth_required_when_configured(
-    mock_gcid, mock_secret, mock_settings, mock_week, mock_status, mock_put, mock_lam
+    mock_gac,
+    mock_gcid,
+    mock_secret,
+    mock_settings,
+    mock_week,
+    mock_status,
+    mock_put,
+    mock_lam,
 ):
     """When Google auth is configured and no token is provided, return 403."""
     from submit_order_handler import lambda_handler
@@ -396,8 +404,16 @@ def test_google_auth_required_when_configured(
 @patch(
     "submit_order_handler._get_google_client_id", return_value=VALID_GOOGLE_CLIENT_ID
 )
+@patch("submit_order_handler._google_auth_configured", return_value=True)
 def test_google_auth_bypass_prevention(
-    mock_gcid, mock_secret, mock_settings, mock_week, mock_status, mock_put, mock_lam
+    mock_gac,
+    mock_gcid,
+    mock_secret,
+    mock_settings,
+    mock_week,
+    mock_status,
+    mock_put,
+    mock_lam,
 ):
     """Google auth enabled + name/email in body but no token -> 403 (can't bypass)."""
     from submit_order_handler import lambda_handler
@@ -434,7 +450,9 @@ def test_google_auth_bypass_prevention(
     "submit_order_handler._get_google_client_id", return_value=VALID_GOOGLE_CLIENT_ID
 )
 @patch("submit_order_handler.urllib.request.urlopen")
+@patch("submit_order_handler._google_auth_configured", return_value=True)
 def test_google_token_audience_mismatch(
+    mock_gac,
     mock_urlopen,
     mock_gcid,
     mock_secret,
@@ -483,7 +501,9 @@ def test_google_token_audience_mismatch(
     "submit_order_handler._get_google_client_id", return_value=VALID_GOOGLE_CLIENT_ID
 )
 @patch("submit_order_handler.urllib.request.urlopen")
+@patch("submit_order_handler._google_auth_configured", return_value=True)
 def test_google_token_domain_mismatch(
+    mock_gac,
     mock_urlopen,
     mock_gcid,
     mock_secret,
@@ -534,7 +554,9 @@ def test_google_token_domain_mismatch(
     "submit_order_handler.urllib.request.urlopen",
     side_effect=urllib.error.URLError("Connection refused"),
 )
+@patch("submit_order_handler._google_auth_configured", return_value=True)
 def test_google_token_service_unavailable(
+    mock_gac,
     mock_urlopen,
     mock_gcid,
     mock_secret,
@@ -581,7 +603,9 @@ def test_google_token_service_unavailable(
         None,
     ),
 )
+@patch("submit_order_handler._google_auth_configured", return_value=True)
 def test_google_token_http_error_returns_403(
+    mock_gac,
     mock_urlopen,
     mock_gcid,
     mock_secret,
@@ -608,6 +632,47 @@ def test_google_token_http_error_returns_403(
     mock_put.assert_not_called()
 
 
+@patch("submit_order_handler._lambda")
+@patch("submit_order_handler.put_order")
+@patch("submit_order_handler.get_form_status", return_value="open")
+@patch("submit_order_handler.current_week", return_value="2026-W20")
+@patch(
+    "submit_order_handler.get_settings",
+    return_value={"bulk_discount_percent": 0, "company_subsidy_percent": 0},
+)
+@patch("submit_order_handler.get_secret", return_value=TEST_API_KEY)
+@patch(
+    "submit_order_handler._get_google_client_id",
+    side_effect=Exception("ParameterNotFound"),
+)
+@patch("submit_order_handler._google_auth_configured", return_value=True)
+def test_ssm_failure_fails_closed(
+    mock_gac,
+    mock_gcid,
+    mock_secret,
+    mock_settings,
+    mock_week,
+    mock_status,
+    mock_put,
+    mock_lam,
+):
+    """SSM fetch failure with auth configured -> 503, not silent fallback to manual."""
+    from submit_order_handler import lambda_handler
+
+    items = _make_items([(10.00, 1)])
+    event = _submit_event(items)
+    result = lambda_handler(event, None)
+    status, body = _parse_response(result)
+
+    assert status == 503, (
+        f"Expected 503 for SSM failure (fail-closed), got {status}: {body}"
+    )
+    assert "temporarily unavailable" in body["error"], (
+        f"Expected 'temporarily unavailable' in error, got: {body['error']}"
+    )
+    mock_put.assert_not_called()
+
+
 @patch("submit_order_handler._lambda")
 @patch("submit_order_handler.put_order")
 @patch("submit_order_handler.get_form_status", return_value="open")
@@ -621,7 +686,9 @@ def test_google_token_http_error_returns_403(
     "submit_order_handler._get_google_client_id", return_value=VALID_GOOGLE_CLIENT_ID
 )
 @patch("submit_order_handler.urllib.request.urlopen")
+@patch("submit_order_handler._google_auth_configured", return_value=True)
 def test_google_token_valid_success(
+    mock_gac,
     mock_urlopen,
     mock_gcid,
     mock_secret,