SPEC v0.20: D-119 APK download rate limit; owner answers to the security review; HANDOFF, prompts

D-119 (landed 96e4cbd, security review L-3): E-6 at most 10 requests per
minute per client IP in its own window, not counted against the 60 of the
other unauthenticated endpoints; SPEC §8.6, §10.6, E-6. M-1 closed by the
owner as an accepted risk (§8.1, §8.7); the D-114 limits confirmed (§11.4).
HANDOFF: main and origin at 96e4cbd, NPM rework (D-120) in flight, owner
steps and questions rewritten, numbering next D-121 and v0.21.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

docs/decisions.md

@@ -123,3 +123,4 @@ entry and the old one a strike-through plus a pointer. The spec is updated in th
 | D-116 | 2026-10-18 | Notifications are posted with `VISIBILITY_PRIVATE` and a public version carrying the generic "Kvitt" / "Open Kvitt to see it" (`notif_generic_title`, `notif_generic_body`), so a secure lock screen shows no description, amount, account or name (new AC-13.9; `NotificationPrivacyTest`). L-6 (a link can prefill any server on S-1) stays as built: S-1 opens its server row expanded when the link's server is not the release default, release builds require `https://`, and a paired phone ignores links (D-084); a confirmation step would need a design state and is not in v1 (OQ-6). Landed by M12f (`2bd6b58`). | Security review L-7 and L-6. | SPEC §4 (AC-2.6, AC-2.8, AC-13.9), §12 (OQ-6) |
 | D-117 | 2026-10-18 | Infra security fixes, landed `7fb86f5`. (1) Caddy's access log and error log (`log default`) filter `request>uri` with ``regexp `^(/i/)[^?]+\|([?]).+` `${1}${2}REDACTED` `` (`wrap json`), so invite codes and the `?from=` name never reach a log; `Authorization` stays redacted by default. (2) Deferred response headers `Content-Security-Policy "default-src 'none'; style-src 'unsafe-inline'; base-uri 'none'; form-action 'none'; frame-ancestors 'none'"`, `X-Content-Type-Options nosniff`, `X-Frame-Options DENY`, `Referrer-Policy no-referrer`. (3) The `caddy` container runs as `10002:10002` with `group_add` 1000, `read_only`, `cap_drop: [ALL]` plus `cap_add: [NET_BIND_SERVICE]` (the image's binary has that file capability and cannot be exec'd without it), `no-new-privileges`, tmpfs `/config` and `/tmp`; `install.sh` sets `/certs` 0750 1000:1000 and `caddy_data` to 10002 (extends D-105). (4) The development stack mounts `infra/dev/secrets/` (git-ignored), into which `up.sh` copies only `fcm-service-account.json`. (5) `deploy.sh` and `install.sh` print each pulled image's digest and append `<UTC time> <KVITT_TAG> <image reference> <digest>` to `/opt/kvitt/deployed-digests`, with a WARNING when a recorded reference changed digest; the workflow prints the pushed digests. (6) `kvitt_cicd` needs only `write:package` (the tag push uses the checkout credentials). (7) The plain root key (variant B) for cert-sync is no longer acceptable: variant A (restricted) or a dedicated non-root user. (8) One-off check after the router forward that Caddy's `remote_ip` shows public addresses. | Security review at `18c527f`: L-1, L-2, L-5, L-9, M-2, I-5. | SPEC §8.7, §8.9, §10 intro, §10.2, §10.3, §10.5.1, §10.5.2, §10.10; `infra/pi/`, `infra/dev/`, `.gitea/workflows/build-images.yaml`, `infra/README.md` |
 | D-118 | 2026-10-18 | Shared test support lives in `:core:design`'s test fixtures (`src/testFixtures`, package `se.hagstedt.kvitt.design.testing`: `Variant`, `TestClock`, `TestEnvironment`, `ScreenSnapshots` with capture modes `Root`/`Screen`/`ScreenWhenIdle`, `MainDispatcherRule`, `withMain`), consumed as `testImplementation(testFixtures(project(":core:design")))`; not a module, so the §6.2 graph is unchanged; the architecture check rejects test fixtures outside test configurations. The convention plugin `kvitt.android.screenshots` wires Roborazzi and the test libraries; feature build scripts carry no screenshot block. Shared failure texts (`format/Failures.kt`: `FAILURE_NETWORK`, `commonFailureText`), limits (`format/Limits.kt`: `BP_TOTAL`, `DISPLAY_NAME_MAX`, `DESCRIPTION_MAX`, `NOTES_MAX`, `FIRST_DATE`, `DAYS_AHEAD_MAX`) and `savedSplitLabel` live in `:core:design`. `KvittMotion` holds only the seesaw spring; `KvittIcon.Description` and unused dimens/shapes removed; catalog entries `roborazzi-junit-rule`, `roborazzi-compose`, `androidx-hilt-navigation-compose`, `androidx-lifecycle-viewmodel-compose` removed; one `CopyCategoryKeywords` task shared by `:data` and `:core:fakes`. 941 tests, no golden changed, release APK 10.46 MB. Landed by the Android overhaul (`e4e6e5d` to `c582363`). | Eight modules each had a copy of the same screenshot harness, and M12f had to fix the same capture bug in two of them; test fixtures rather than a `:core:testing` module let `:core:design`'s own tests use them, add no module to the §6.2 graph and are treated by lint as test sources. The failure-text map, the limits (`BP_TOTAL` in five copies) and the saved-split label were duplicated across features; the removed tokens, icon and catalog entries were never referenced. | SPEC §6.2 (`:core:design` row, Screenshot tests), §11.1, §11.3; `docs/ux/design-spec.md` §2.11 and the icon table; `android/README.md` |
+| D-119 | 2026-10-19 | APK download rate limit. E-6 `GET /apk/files/{file_name}` is limited to 10 requests per minute per client IP in its own fixed window (`APK_DOWNLOAD_LIMIT` in `src/api/rate_limit.rs`), separate from and not counted against the 60 per minute of the other unauthenticated endpoints; the client IP as in D-032 (peer, or the last `X-Forwarded-For` entry from the trusted proxy); refusals are 429 `rate_limited` with `Retry-After`; every request counts, a 404 included; in memory, pruned like the other windows. E-5 `GET /apk/latest` and E-4 `GET /i/{code}` stay on the 60 per minute. Landed `96e4cbd` (unit test and an integration test in `tests/core_api/rate_limit.rs`). Owner: "APK download limit assumed is OK". | Security review L-3: each E-6 answer can be a ~10 MB APK, so 60 per minute per IP let one client pull about 600 MB a minute from the Pi; E-5 and E-4 answers are small and the phone checks E-5 at most every 6 hours (AC-16.2). | SPEC §8.6, §10.6, §14.3.4 (E-6), §11.4 |