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Closes #59. Symptom: /workspaces/:id/activity returns 429 with rate-limit-exceeded on hongming.moleculesai.app whenever multiple workspaces are visible in the canvas. Single-tab, single-user, well within the documented 600 req/min budget — but every request collapsed into one bucket. Root cause: workspace-server's RateLimiter keyed buckets on c.ClientIP(). After issue #179 turned off proxy-header trust (SetTrustedProxies(nil), correctly closing the XFF spoofing hole), c.ClientIP() returns the TCP RemoteAddr — which in production is the upstream proxy (Caddy on per-tenant EC2; CP/Vercel on the SaaS plane). Every browser tab + every canvas consumer + every poll loop for every tenant collapsed into one bucket. Fix: bucket key derivation moves into a single keyFor helper that mirrors the SSOT pattern of: - molecule-controlplane/internal/middleware/ratelimit.go (org > user > IP) - this package's own MCPRateLimiter (token-hash via tokenKey) Priority: X-Molecule-Org-Id header → SHA-256(Authorization Bearer) → ClientIP. Token values are kept hashed in the bucket map so the in-memory state can't become a token dump. Tests: - TestKeyFor_OrgIdHeaderTrumpsBearerAndIP — priority order - TestKeyFor_BearerTokenWhenNoOrgId — middle tier + raw-token leak pin - TestKeyFor_IPFallbackWhenNoOrgIdNoBearer — anon probe path - TestRateLimit_TwoOrgsSameIP_IndependentBuckets — load-bearing regression (issue #59) — two tenants behind same upstream proxy must not share a bucket - TestRateLimit_TwoTokensSameIP_IndependentBuckets — same shape for the per-tenant Caddy box - TestRateLimit_SameOrgDifferentTokens_SharedBucket — counter-pin: rotating tokens within one org must NOT bypass the org's quota - TestRateLimit_Middleware_RoutesThroughKeyFor — AST gate, mirrors the SSOT gates established in #36/#10/#12 Mutation-tested: - strip org-id branch in keyFor → 3 tests fail - strip bearer-token branch → 2 tests fail - reintroduce direct c.ClientIP() in Middleware → 3 tests fail (including the AST gate) Existing tests pass unchanged: dev-mode fail-open, X-RateLimit-* headers (#105), Retry-After on 429 (#105), XFF anti-spoofing (#179). No schema/API change. 429 response body and X-RateLimit-* headers unchanged. RATE_LIMIT env var semantics unchanged. Hostile self-review (three weakest spots) is in the issue body: 1. one-shot Docker-inspect cost is now bucket-key derivation cost (string compare + SHA-256 of bearer); single-digit microseconds. 2. X-Molecule-Org-Id is unvalidated at the rate-limiter layer — spoofing is closed by tenant SG + CP front; documented in keyFor's docstring with the conditions under which to revisit. 3. cpProv-style SaaS surface is out of scope; CP's own limiter handles that hop. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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