Closes P0 #6 (no rate limiting) from PARTIAL → RESOLVED. With
this merge, all 8 P0 ship-blockers are RESOLVED. fix-auth-bypass
Brief 4 shipped lib/rate-limit.js with a single 5/15min auth
limiter wired into login + register; this brief extends the
module to 5 named limiters (auth/search/upload/generate/import)
and wires them into the remaining abusable surface.
Per architect Decision 1 — Option A (gate all 3 import routes
uniformly). The architect's investigation found a critical
secondary bug: pages/admin/card-import.js's fetch sends NO
Authorization header today. Adding getUserFromRequest to the
import APIs without fixing the admin UI atomically would have
returned 401 on every "Import Cards" click. Both edits ship in
this single commit — API gating + admin UI Bearer fix — for
atomic safety. Lorcana is dead in frontend today (only
scripts/import-lorcana.js uses that path) but gated uniformly
to future-proof per AGENTS.md § 1 status; a
delete-dead-lorcana-import follow-up convoy is queued for later
if we decide to drop Lorcana entirely.
Per Decision 2 — hybrid named-limiter shape in lib/rate-limit.js.
checkAuthRateLimit(req) signature + return shape preserved
verbatim (don't break Brief 4's contract); 4 new named functions
added (checkSearchRateLimit, checkUploadRateLimit,
checkGenerateRateLimit, checkImportRateLimit). Map<className,
Ratelimit> cache, per-class Redis prefix (tcgvault:auth,
tcgvault:search, tcgvault:upload, tcgvault:generate,
tcgvault:import) so each class has its own budget.
Per Decision 3 — per-class limit values tuned with evidence:
auth 5 / 15min IP-keyed (unchanged from Brief 4)
search 60 / 1min IP-keyed (bumped from 30 — ShareModal
has no debounce; 17-char email
= 16 requests in <5s)
upload 10 / 1hr user-keyed
generate 5 / 1hr user-keyed (DiceBear is free, kept at 5)
import 5 / 1hr user-keyed (admin-only; external APIs
have their own limits)
Per Decision 4 — two extractors. extractIpIdentifier (existing,
unchanged) and extractUserIdentifier (new). The new one THROWS on
null/undefined/empty/NaN userId to prevent silent fallback-to-IP
(which would convert per-user limits into per-IP and lock out
households). Architect's R-finding: places the gate AFTER the
auth check on every per-user-keyed route, never before.
Per Decision 5 — uniform 429 response shape verbatim matching
login.js/register.js: Retry-After header + JSON
{ error: 'Too many attempts. Try again later.' }. Anti-
fingerprinting (per-class messages would tell an attacker which
classes have which limits).
Per Decision 6 — no new per-route handler tests this convoy.
Vitest 21/21 unchanged at merge.
Verification:
- npm run lint: 128 problems (baseline match)
- npm run test:run: 21/21 vitest pass (no regression;
auth-utils tests don't transitively load rate-limit per
architect D6 evidence)
- 5 named limiter exports verified via per-route grep counts
- Admin UI sends Authorization: Bearer <token> from
localStorage in the import fetch (matching pattern from
other admin pages)
- Brief 4's login.js + register.js byte-identical at HEAD
- .cursor/rules/api-routes.mdc § Rate limiting extended with
per-class table + gate-ordering rules
No new dependencies (Brief 4's @upstash/ratelimit + @upstash/redis
suffice). No workflow YAML changes. No AGENTS.md edits (doc-
writer pass at convoy close handles Gotcha #12 update + § 6
testing update + ship-readiness Status summary 7/8 → 8/8).
Co-authored-by: Cursor <cursoragent@cursor.com>
Adds rate limiting to /api/auth/login and /api/auth/register and removes
their wide-open CORS allowlist.
Rate limiting (@upstash/ratelimit + @upstash/redis):
- 5 attempts per 15-minute sliding window per IP, prefix "tcgvault:auth"
- new lib/rate-limit.js, lazy singleton, single source of truth
- reads KV_REST_API_URL / KV_REST_API_TOKEN (Vercel Upstash Marketplace
convention — auto-provisioned, no manual env-var setup needed)
- fail-closed in production if env vars are missing (better to error
one login than silently disable brute-force protection on live)
- fail-open in dev/test if env vars are missing (single console.warn)
- fail-open on Upstash backend outage (defense-in-depth — don't lock
the entire userbase out if Upstash is down)
- IP extracted from x-forwarded-for first hop, with socket fallback;
NOT req.body.email (rotates) or Authorization header (absent on
unauthenticated login)
CORS:
- Removed Access-Control-Allow-Origin: * + companion headers + OPTIONS
preflight from login.js and register.js
- These are first-party endpoints called from the same-origin SPA; the
"*" allowlist was a development convenience that shipped to prod
- verify.js is OUT OF SCOPE per architect's "cors-tighten" deferral
(see convoy plan § Architect's calls)
Other handler ordering preserved verbatim per brief: method gate first,
then rate-limit check (returns 429 with Retry-After header), then the
existing try/catch + body parsing + DB work.
Pre-merge requirements: KV_REST_API_URL + KV_REST_API_TOKEN must be set
in Vercel Production (already done — Upstash marketplace integration
auto-provisioned both, confirmed by maintainer 2026-05-23).
Convoy: fix-auth-bypass / Brief 4
Co-authored-by: Cursor <cursoragent@cursor.com>
Randall Stillwell