fix(billing): pass the AppError to responses.error so the 402 whitelist emits in production - #4065
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…error billing.requireQuota's catch block extracted `details = err.details` (for branching on the AppError sub-type) and then handed that sub-object, not `err` itself, to responses.error(...)(details) at every 402/429/503 call site. responses.error reads `error.details` off whatever it's given, so it read `details.details` -> always undefined, silently dropping the whitelisted type/upgradeUrl payload from every response this middleware ever sent, in every environment including production. Pass `err` instead; keep the extracted `details` var only for the `?.type === '...'` branching. This also reshapes the dev-only payload.error blob: it now serializes the real AppError, so curated fields moved from the blob's top level to nested under `.details`. Updated the 8 existing tests (across billing.quota.unit.tests.js and billing.webhook.hardening.unit.tests.js) asserting the old flat shape, and added a dedicated NODE_ENV=production test proving payload.details carries type/upgradeUrl (red before this fix, green after). Fixes #4062 Claude-Session: https://claude.ai/code/session_0185ELiCjZaBJx8PH4xoSsZb
…ayload.details assertion - production-mode tests for 402 PAYMENT_PAST_DUE, 402 unmapped sub-type, 429 QUOTA_EXCEEDED, 503 PLAN_NOT_CONFIGURED (METER_EXHAUSTED already had one) - the 429 test now reads upgradeUrl as its name claims, instead of only checking message/code/status via objectContaining - comment on the Array.isArray unwrap in billing.requireQuota.js now states that an array-shaped details yields no payload.details either way (pickWhitelistedDetails drops it), so the branch is dead-but-harmless Claude-Session: https://claude.ai/code/session_0185ELiCjZaBJx8PH4xoSsZb
WalkthroughThe quota middleware now passes the original ChangesBilling quota error payload
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The quota middleware now preserves whitelisted AppError details in production responses and has branch coverage for the updated payloads. The remaining risk is limited to required documentation for modified functions and does not change runtime behavior. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #4065 +/- ##
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+ Coverage 94.23% 94.24% +0.01%
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Files 172 172
Lines 5894 5894
Branches 1890 1891 +1
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+ Hits 5554 5555 +1
+ Misses 277 276 -1
Partials 63 63
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In `@modules/billing/middlewares/billing.requireQuota.js`:
- Around line 59-76: Add JSDoc headers to requireQuota documenting resource,
action, and its returned middleware, and to each modified or new async test
callback documenting a resolved Promise<void>. Apply this in
modules/billing/middlewares/billing.requireQuota.js:59-76 and
modules/billing/tests/billing.quota.unit.tests.js at 262-262, 383-393, 406-406,
446-446, 501-502, 507-507, 598-598, 615-617, 623-623, 703-703, 729-730, and
754-755; preserve all existing test behavior.
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ERRORS.mdmodules/billing/middlewares/billing.requireQuota.jsmodules/billing/tests/billing.quota.unit.tests.jsmodules/billing/tests/billing.webhook.hardening.unit.tests.js
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What
modules/billing/middlewares/billing.requireQuota.jsextractedconst details = err.detailsand then calledresponses.error(res, status, title, description)(details)— passing the sub-object as the error parameter.responses.errorreadserror.detailsfrom what it is handed. Givendetails, it readdetails.details— alwaysundefined. So the whitelistedtype/upgradeUrlpayload never emitted, on the exact path the production error envelope was built for. A client rendering an upgrade CTA on meter exhaustion or a past-due subscription had nothing to render.Fixed at all five call sites (402 ×3, 429, 503) — the issue named three.
detailsis kept only for the?.type ===branching.Before / after
Real code path,
NODE_ENV=production:Per site, after:
PAYMENT_PAST_DUE → {type}·METER_EXHAUSTED → {upgradeUrl, type}· generic/defensive 402 →{type}with a non-whitelistedinternalHintcorrectly dropped ·QUOTA_EXCEEDED → {upgradeUrl, type}·PLAN_NOT_CONFIGURED → {type}.An adversarial
detailscarrying an internal hostname, an IP, a Mongoerrmsgwith credentials and a stack-shaped string was driven through the fixed path: only{type, upgradeUrl}survived. The whitelist's exact-key + safe-scalar gate holds whatever the error carries.The test was the real bug
The existing test asserted
type/upgradeUrlviaJSON.parse(payload.error)— the serialized-error blob, which only exists outside production. It never assertedpayload.details, the field a production client reads. So it passed in every environment while the production behaviour was wrong. That is why this survived.Every one of the five sites now has a production-mode assertion on
payload.details, each proven by reverting(err)→(details)on that site's line only:The 402-generic and 429 rows are the point: only the new guard reads that shape. Under the 429 reversion the sibling
objectContainingtests — checkingmessage/code/status— stayed green, which is precisely how this bug shipped.The 402-generic branch had no coverage of any kind before; its new test also pins that
message/descriptionstay generic and never leakerr.message.Collateral, verified not weakened
Passing the real
AppErrormeans the dev-onlypayload.errorblob now serializes it, so curated fields moved from top-level to nested under.details. Eight pre-existing tests asserted the old flat shape and were updated — each is a pure relocation (errData.type→errData.details.type), same values, same matcher strength, no assertion dropped. Independently re-checked one by one during review.(
JSON.stringifyon anErroryields{status, code, name, details}—messageandstackare non-enumerable and never serialize, so an assertion on those would have been vacuous either way.)One comment corrected
The middleware branches on
Array.isArray(err.details) ? err.details[0] : err.details. That branch is unreachable from every current billing throw site, butAppErrordefaultsdetailsto[{message}]when a throw site omits it, so the shape is reachable in principle. Kept the branch, and the comment now states the real consequence:pickWhitelistedDetailsreturnsundefinedfor array-shapeddetails, so that shape ships with nopayload.detailsat all.Verification
Lint clean. Unit: 178 suites / 2490 tests green (baseline 178/2487, +3 as expected) — cited as proof per this repo's known Mongo-integration flakiness. The full run showed 4 failures in files this diff does not touch (
invitations.integration,auth.signup.attribution.integration,public.docs.integration, and a 140ms-vs-50ms perf gate), matching that documented pattern; both billing-quota suites pass in the same run.Found, not fixed
Two remaining sites call
responses.error(...)with a non-error argument, both confirmed by execution and filed as #4064:lib/middlewares/analytics.requireFeatureFlag.js:45passes a flat{type, flag}so itstypeis silently dropped in every environment, andmodules/home/controllers/home.controller.js:66passes a raw health-check payload.modules/billing/controllers/billing.controller.js:26bypassesresponses.errorentirely — separate known issue, untouched.Closes #4062
https://claude.ai/code/session_0185ELiCjZaBJx8PH4xoSsZb
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