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…vectors (LAB-2879)
spec/saas-api.md documented /v1/cache/{key} and its /ttl and /lock
sub-resources without saying how {key} is placed in the path. That silence
cost three SDK tickets (cachekit-py#279 CWE-22; LAB-2877 ts; LAB-2878 rs).
New normative section "Cache-Key Path Encoding": one percent-encoded segment
with only RFC 3986 unreserved chars raw; the server decodes exactly once and
validates the decoded key (no double-encoding, %2F never a boundary, health/
ttl/lock are route tokens); encoders may differ on the sub-delims !*'() because
interop is defined on the decoded key, and every server-accepted key is
byte-identical on the wire regardless.
All-dot keys are stack-dependent and %2E is NOT a universal fix. RFC 3986
stacks (httpx 0.28.1) leave %2E%2E intact; WHATWG stacks (Node 25 URL/undici
Request, rust-url 2.5.8 parser.rs:1319-1337) collapse %2e / %2e%2e / .%2e /
%2e. in any case. On WHATWG stacks the client MUST reject "." / ".." before
building the URL. Found by execution while writing the section.
test-vectors/path-encoding.json: 12 key/encoded/decoded rows (canonical key,
embedded ../, ?# injection, space, %, both all-dot keys flagged dot_segment,
inert a:.. / ..a, ns:key, encoder-variance row with encoded_alternates).
tools/path-encoding-verify.py (stdlib): pins encoded to the reference encoder,
single-decode round-trip, rejects raw / ? # % and literal dot segments,
cross-checks the WHATWG flag; mutation self-test runs first. Wired into
verify.yml as an additional check.
sdk-feature-matrix.md: Compliance Status row with actual state (py merged
f000ba3, unreleased; rs/ts partial, in progress). README + CHANGELOG updated.
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Included review availability: This review used your included allowance. 0 included reviews remain after this review. Your included PR review attempts over the past 7 days set your current allowance at 1 review per hour. WalkthroughThe PR defines SaaS API cache-key path-encoding rules, adds conformance vectors, introduces a standalone validator with mutation tests, updates compliance documentation, and runs verification in CI. ChangesCache-key path encoding
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In `@tools/path-encoding-verify.py`:
- Line 33: Make the path validator Ruff-compatible by converting boolean
parameters in the validator functions, including check, to keyword-only
parameters and updating the call at the boolean positional-argument site to use
the corresponding keyword. Refactor the TRY003 violations in check and the
validation error path so custom exception construction does not embed long
inline messages, using an appropriate exception type or dedicated message
handling while preserving existing validation behavior.
- Line 62: Update the alternate-encoding validation around check_segment so it
accepts only the exact quote(key, safe="!*'()") representation, rejecting hybrid
encodings that merely decode to the same key; add a self-test covering the mixed
encoded/unencoded delimiter case.
- Around line 45-48: Update check_segment and its alternate-segment comparison
to decode percent-encoded bytes using strict UTF-8, rejecting invalid sequences
such as %FF instead of replacing them with U+FFFD; only compare successfully
decoded values with key.
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…er WHATWG parse collapses %2E (LAB-2879 panel round 1) Expert panel (bug-hunter + security, independently) probed api.cachekit.io: GET /v1/cache/%2E%2E/health returns the /v1/health response and /v1/cache/%2E%2E/ttl routes as /v1/ttl, while /v1/cache/a%3A..%2Fb/ttl reaches cache auth. The saas worker parses with WHATWG new URL(request.url) (index.ts:234), so the stack-dependent MAY-encode-to-%2E rule was false: no wire form of an all-dot key reaches the validator from any client. Reproduced before rewriting. Rule 2 is now uniform: clients MUST reject a key whose encoded form is exactly . .. health ttl lock (the last three are route tokens on the same level, per the security agent). Rule 1 scopes its MUST so the !*'() tolerance of rule 4 is not a contradiction. Rule 3 states the WHATWG parse precedes split and decode, and spells the ns:/nsapi: namespace shape. ns:key row note corrected (server rejects it). Evidence blockquote trimmed (no source line ranges). Vectors: 15 rows — 5 reject rows (encoded/decoded null) replace the dot_segment flag; envelope and row notes trimmed to row-specific facts. Verifier: one regex (alternates only), reserved-segment logic keyed on quote(key, safe=''), 7 mutations each tripping a distinct guard, poison built outside the try. CHANGELOG shortened and corrected (cachekit-py v0.18.0 tagged 2026-09-04, PyPI still 0.17.1). Matrix: Python downgraded to Partial with follow-up LAB-2880; call-site counts dropped.
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Spell the ns:/nsapi: namespace grammar (1-64 chars, non-empty rest) as the deployed validator enforces it; say '.'/'..' where 'all-dot' was imprecise ('...' is all-dot yet transmittable); collapse the verifier's unreachable WHATWG %2e set to the five literal reserved segments quote() can actually emit; make each self-test mutation assert the guard it names; CHANGELOG no longer reads as if cachekit-py#279 introduced the bug.
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…pes and duplicate alternates (LAB-2879) Review round on head a0ea1a2 surfaced two real gaps in the alternates loop of tools/path-encoding-verify.py, both fixed here: - Non-UTF-8 escape accepted (CodeRabbit, functional correctness). unquote() defaults to errors="replace", so unquote("%FF") returns U+FFFD instead of rejecting it. A vector with key U+FFFD and alternate "%FF" would pass, though "%FF" is not valid UTF-8 and violates spec rule 1. New decodes_to() helper percent-decodes with errors="strict" and treats a UnicodeDecodeError as a non-match, so an invalid escape can never masquerade as a conformant alternate. - Duplicate alternate accepted (Kody, correctness). The rewrite dropped the alt != encoded distinctness guard, so an encoded_alternates entry that repeats the row's reference encoded form passed silently, weakening spec rule 4 (an alternate is a distinct conformant wire form). Guard re-added as the first check in the loop. self_test gains two mutations — "alternate repeats encoded" and "alternate non-utf8 escape" — so each new guard is proven to trip, per the file's own doctrine that every guard has a poisoned-copy mutation. Also sorted the import block (ruff I001). The FBT001/FBT003/TRY003 and EXE001/LOG015 that CodeRabbit's assertive-profile ruff reports are the same patterns the already-merged sibling tools/file-backend-reference.py carries; rebutted on the PR rather than diverged from the established verifier convention in one file. No CI ruff gate exists; default ruff check is clean bar EXE001/LOG015. Verifier passes: self-test + 15 vectors. Spec text (saas-api.md) unchanged — the cache-key format the expert panel blessed in rounds 1-2 is untouched; this is test-tooling hardening only.
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Inline comments:
In `@CHANGELOG.md`:
- Line 39: Update the mutation count in the changelog entry describing the
verifier self-test from seven to nine, matching the mutations defined by the
path-encoding verifier.
In `@tools/path-encoding-verify.py`:
- Line 76: Update the nested set_field function signature by adding an explicit
return type annotation, using the appropriate type for its current behavior and
preserving its existing parameters and implementation.
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…ld return (LAB-2879) CodeRabbit @6abf38d, 2 actionable MINOR: - CHANGELOG: self-test count 7 → 9 (matches mutations dict) - path-encoding-verify.py: ANN202 return annotation on nested set_field
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@27Bslash6 converged and ready for your signoff/merge: CodeRabbit APPROVED (0 actionable), Kody APPROVED, test-vectors green, merge state CLEAN on head |
…CWE-22, LAB-2877) (#118) ## Summary Reject the five reserved cache-key path segments — `.`, `..`, `health`, `ttl`, `lock` — client-side in the CachekitIO backend, before any URL is built, per protocol `spec/saas-api.md` § Cache-Key Path Encoding rule 2 ([cachekit-io/protocol#61](cachekit-io/protocol#61)). CWE-22 defence-in-depth, and cross-SDK parity with cachekit-rs ([cachekit-io/cachekit-rs#76](cachekit-io/cachekit-rs#76)). - **Shared `encodeKey()`** replaces the five raw `encodeURIComponent(key)` sites (core GET/PUT/DELETE/HEAD, TTL GET/PATCH, lock POST/DELETE) and throws `ConfigurationError` for a reserved segment or malformed UTF-16 (lone surrogate). Every other key is exactly `encodeURIComponent(key)`. - **URL construction hoisted above each network `try`**, so the `ConfigurationError` reaches the caller unwrapped instead of being re-thrown as `BackendError` (CodeRabbit finding). Same pattern `refreshTTL` already used for `validateTtl`. - **`Backend.validateKey?` capability**, mirroring `validateTtl`: `CachekitIOCore` implements it, the TTL / Lockable / combined wrappers forward it, and `CacheImpl` calls it synchronously in `get` / `set` / `delete` / `exists` before the reliability executor. Without it the public `createCache(...).get('health')` path retried the deterministic error, counted it against the circuit breaker (five reserved keys in 60 s opened the breaker and blackholed legitimate keys), then degraded it into a silent miss / no-store (expert-panel finding). - **Tests** move to the protocol lane (`test/protocol/path-encoding.protocol.test.ts`, 148 tests) and drive the real `CachekitIOCore` / `TTLCachekitIO` / `LockableCachekitIO` through a fetch spy, asserting on the WHATWG-parsed `new URL(url).pathname` that `fetch` received. Vectors are the vendored `protocol/test-vectors/path-encoding.json` v1.0.0 (15 rows, 5 reject). A `cache.test.ts` regression pins the `validateKey` pre-flight beside the existing `validateTtl` one. - **SECURITY.md** gains a "Cache-Key Path Encoding (CWE-22)" section. ## Why reject rather than encode (AC-0 repro) `.` is RFC-3986 unreserved, so `encodeURIComponent('..') === '..'`, and the WHATWG parser behind `fetch` removes the dot segment before the request leaves the process: ```js new URL('https://api.cachekit.io/v1/cache/..').pathname // '/v1/' new URL('https://api.cachekit.io/v1/cache/../ttl').pathname // '/v1/ttl' new URL('https://api.cachekit.io/v1/cache/%2E%2E/lock').pathname // '/v1/lock' (%2E does not help) ``` The SaaS worker parses the request URL with WHATWG `new URL()` too, so `%2E%2E` collapses server-side even from an RFC-3986 client (spec evidence: `GET /v1/cache/%2E%2E/health` returns the health payload). No wire form of `.` / `..` reaches the key validator from any client, so the spec mandates client-side rejection on every stack. `health`, `ttl`, `lock` are route tokens at the same level: `/v1/cache/health` is the health endpoint, and a trailing `ttl` / `lock` selects a sub-resource with an empty key. The SaaS router matches them exactly and case-sensitively (`apps/cache/src/index.ts:509,655`), so only the lowercase words are reserved; `HEALTH`, `ttls`, `a:..`, `..a` transmit unchanged. ## Cross-SDK position (AC-4) - **cachekit-rs** ([cachekit-io/cachekit-rs#76](cachekit-io/cachekit-rs#76), merged) rejects the same five tokens in `encode_key`. Same behaviour; ts and rs are **decode-equivalent, not byte-identical**: `urlencoding::encode` escapes `! * ' ( )` where `encodeURIComponent` leaves them raw (spec rule 4, fixture `encoded_alternates`). The SaaS decodes both to the same key, and every key the server accepts is drawn from `[A-Za-z0-9_.:-]`, on which all encoders agree, so canonical and interop keys are byte-identical on the wire across SDKs. - **cachekit-py** (`_encode_key` @ `f000ba3`) still rewrites `.` / `..` to `%2E`, which only moves the collapse to the server; a py follow-up ticket tracks the switch to rejection. For every non-reserved key, py and ts are decode-equivalent as above. ## Test plan - [x] AC-0 repro: raw dots and `%2E` collapse under `new URL()`, pinned as the design premise - [x] AC-1 (as amended by the spec): `encodeKey` rejects the five reserved segments; identity with `encodeURIComponent` for every transmittable vector and for near-misses - [x] AC-2: 8 operations × 10 transmittable vectors assert the exact WHATWG-parsed pathname inside `/v1/cache/`; 8 operations × 5 reserved keys reject with `ConfigurationError` and never call `fetch` - [x] AC-3: decode-once round-trip asserted on the real wire path for every vector - [x] AC-4: this section - [x] AC-5: SECURITY.md - [x] AC-6: expert panel at high stakes, post-spec — FIX-FIRST, every finding applied (detail on the ticket) - [x] `validateKey` pre-flight regression through `createCache` (`cache.test.ts`) Local: eslint, prettier, tsc clean; 148/148 protocol tests; full suite 899 pass with 16 failures confined to key-rotation / bin-envelope tests that need the not-yet-published core-ts 0.1.3 native binding (no cargo in this workdir, so the 0.1.2 npm binary stood in). Closes LAB-2877 <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added safer cache-key handling for path-based operations. * Invalid, reserved, or malformed keys are rejected before network requests. * Added validation across standard cache, TTL, and locking operations. * Documented cache-key encoding and validation rules. * **Bug Fixes** * Prevented path traversal and URL normalisation issues during cache operations. * Ensured invalid keys fail immediately rather than being retried as backend errors. * **Tests** * Added coverage for key encoding, reserved keys, traversal attempts, and related cache operations. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Co-authored-by: Winston <ray@insighttimer.com>
Conflict: CHANGELOG.md only. Both sides insert a new section directly under the [Unreleased] heading. Pure adjacent insertion, nothing dropped: kept both, with the LAB-2879 section of this PR above the LAB-4093 section from main, so the block from main stays contiguous with the Wire format section. spec/saas-api.md auto-merged and the two edits are independent: main rewrites the 400/401/503 rows of the status table, while this PR adds a TOC entry and the new Cache-Key Path Encoding section.
a6e2a52
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Resolves the CHANGELOG.md conflict with bf465e8 (LAB-687 keyring conformance vectors). Both sides insert a new section directly under "## [Unreleased]"; kept both, this branch's path-encoding section above main's keyring section so main's block stays contiguous. Zero lines dropped from either parent: 38/0 vs main, 30/0 vs a6e2a52, one hunk each. verify.yml and sdk-feature-matrix.md auto-merged in disjoint regions.
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…c215a # Conflicts: # CHANGELOG.md
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1 participant
Resolves LAB-2879. Companion to cachekit-py #279 (LAB-2846), cachekit-ts LAB-2877, cachekit-rs LAB-2878.
Why
spec/saas-api.mddocumentedGET/PUT/DELETE/HEAD /v1/cache/{key},…/ttl,…/lockwithout one word on how{key}is placed in the path. The key is caller-controlled, so that silence was a CWE-22 in waiting. It shipped in cachekit-py, then turned out to be latent in ts and rs too.What
spec/saas-api.md: new normative "Cache-Key Path Encoding" section (before Cache Endpoints, TOC entry added). RFC 2119 rules:{key}is ONE percent-encoded segment; only RFC 3986 unreserved chars raw;/ ? # %, every reserved char, space (%20not+), bytes ≥ 0x80 become%HH; uppercase SHOULD../..) are dot segments removed by the client's URL parser before send, so the server cannot compensate. This is stack-dependent, and the ticket's premise that%2E%2Esuffices everywhere is false: RFC 3986 §5.2.4 stacks (httpx) remove only literal./.., so%2Eworks there; WHATWG stacks (fetch/undici, browsers, Workers, rust-url/reqwest) treat%2e,%2e%2e,.%2e,%2e.in any case as dot segments. No encoding survives; the client MUST reject. Conformance tests MUST assert on the parsed path.[A-Za-z0-9_.:-], no.., namespace shape). No double-encoding;%2Fis never a boundary (router splits on raw/first);health/ttl/lockare route tokens.encodeURIComponentleaves!*'()raw;quote/urlencodingencode them. Both conformant. Every server-accepted key is byte-identical on the wire anyway.test-vectors/path-encoding.json: 12{key, encoded, decoded, note}rows: canonical 7-segment key (fromcache-keys.json),default:../../admin,x/../../health,k?x=1#f,a b,100%,.,..(flaggeddot_segment: true),a:..,..a,ns:key, andf(x)!*'withencoded_alternatesfor theencodeURIComponentform.tools/path-encoding-verify.py(stdlib): pinsencodedto the reference encoder (quote(safe="")+ all-dot%2Erewrite), single-decode round-trip, no raw/ ? # %, not a literal dot segment,dot_segmentflag must match the WHATWG set exactly; a 9-mutation self-test runs first. Added as a new step inverify.yml: this adds a check and touches no existing step.sdk-feature-matrix.md: Compliance Status row with actual state: py ✅ mergedf000ba3, unreleased (PyPI latest 0.17.1,mainstill 0.17.1, so no aspirational tick); rs/ts[Unreleased]entry.Evidence
All ten
verify.ymlPython steps and both zero-dep Node cross-checks pass locally, including the new verifier (validated 12 path-encoding vectors (self-test passed)).Out of scope
No SDK code, no SaaS change, no edit to
spec/cache-key-format.md. Expert-panel review (crypto/protocol gate) runs on this PR before it moves to In-Review.Summary by CodeRabbit
Documentation
Tests