feat(worker): reject non-canonical-case `/api`, `/auth`, `/live` paths and run the Worker first at the Access phase

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Issue-Typ
Feature
Klarheit
Klar beschrieben
Aktivitätsstatus
Aktiv
Tech-Stack
react, rust
Bereich
backend, infrastructure, testing

Rechercherichtung

Start with crates/thrust-worker/wrangler.toml and the Worker router; read ADR-0011 and ADR-0050 for the asset and Access behavior. Add router-level tests for the listed case variants, valid routes, and asset fallback, then verify the Access-phase config and hashed asset serving under wrangler dev. Done includes answering Q-0050.7 and, after deployment, rerunning the real-edge probes.

Vom Indexierungsmodell aus dem Issue-Text verfasst.

Beschreibung

area:infra prio:p1 review:fable-2026-10-19 type:security

Context

crates/thrust-worker/wrangler.toml has no [assets] block yet; static assets arrive with the React build (#44). ADR-0011 (round 26) sets two rules for them. assets.run_worker_first lists both forms of every path the Worker handles (/api, /api/*, /auth, /auth/*, /live, /live/*), and the SPA fallback is not_found_handling = "single-page-application" (adrs/ui/0011-static-asset-hosting.md:76). At the Access phase, Access gates the UI paths and bypasses /api, /auth and /live, which the application authenticates itself (ADR-0090 round 25, adrs/infra/0090-cloudflare-topology.md:88).

Problem

Spike 0004 run 2 (real platform, Access on) found that Access matches bypass paths case-insensitively, while run_worker_first patterns are case-sensitive.

  • So /Api/, /API/ping, /AUTH/callback and /LIVE/echo skipped Access, missed the Worker, and got the 1,712-byte gated root shell with a 200 and no credentials (research/0006 §13.3 line 591, §13.4 line 604; ADR-0050 :117; ADR-0011 :80; ADR-0141 :78 item 1).
  • Access matches whole path segments: the lookalikes /apix, /api-v2 and /apiary/x stayed gated (§13.3, line 574).
  • Case variants of the gated targets stay gated, and the edge normalises dot-segments before Access matches (§13.4, line 597).
  • Q-0050.7 is open (QUESTIONS.md:304). It matters from the Access phase (P1), not at P0.

Proposal

  • Worker first. At the Access phase set run_worker_first = ["/*", "!/assets/*"]; negative patterns win, and a config takes at most 100 patterns (research/0006 §3.6, line 191). The Worker then serves non-API navigations through the ASSETS binding.
  • Reject case variants. Before routing, and before any asset fetch, percent-decode the first path segment. If its lower-case form is api, auth or live but the exact form is not, answer 404 with a body that is not the shell. Compare the first segment, not a string prefix, matching Access's segment rule above, so /apiary/... and slugs such as /Api-team/... still reach the SPA.
  • Cost. Navigations become Worker invocations. At about 5 M requests a month, that stays inside the included 10 M (research/0004 §9; FR-13).
  • Alternative, if the owner prefers no path-scoped bypass: the API on its own hostname, at the price of cross-origin cookies.
  • Answer Q-0050.7 in ADR-0050 and ADR-0011.

Acceptance criteria

  • Router-level tests (axum, per the rust-test-app skill):
    • /Api/x, /API, /aPi/, /AUTH/callback, /Live/x and /%41pi/x answer 404 with a body that is not the shell;
    • /api/..., /auth/... and /live reach their handlers;
    • /apiary/x and /Api-team/x reach the asset fallback.
  • Control: with the check disabled, the case-variant tests fail because the requests reach the asset fallback.
  • The Access-phase environment's wrangler config carries run_worker_first = ["/*", "!/assets/*"], and under wrangler dev a hashed /assets/* file is still served as the file.
  • Re-running spike 0004's case-variant probes on the real edge with Access on returns 404 for every BF3 path. Control: with the check disabled, the run reproduces the 200 shell. The probe scripts are off-repo (spikes/README.md:54; #55).
  • Q-0050.7 is answered, citing FR-13.

References

  • Review: .agents/plans/contrail/reviews/2026-10-19-fable-architecture-review.md (FR-13)
  • research/0006-topology-public-half.md §3.6 (line 191), §13.3 (lines 574, 591), §13.4 (lines 593-609)
  • ADR-0011 (:76, :80), ADR-0050 (:117), ADR-0090 (:88), ADR-0141 (:78)
  • Q-0050.7, Q-0050.2; research/0004-rust-on-workers-binding-matrix.md §9 (traffic and cost)
  • crates/thrust-worker/wrangler.toml (no [assets] block today)

Finding: FR-13

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