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wai: live-rooms (Draft) — wai.live.room: room descriptor, room grants, exchange and revocation, slots, publish profiles, room verifier (stacked on #279) #284

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Stacked on #279 (wai/live-events, head defa48c0). This branch was cut from origin/wai/live-events, not from main; its base here is main only because the forge's PR tool opens every PR against main, so the diff below includes #279's commits until #279 lands. It lands through the top of the stack: merge #279 first, then this. Do not merge this one on its own.

What this is

Slice L2 of WAI's live and interactive work: wai.live.room, a spec, a reference implementation, a conformance corpus and an independent verifier.

  • wai/extensions/live-rooms.md registers the record wai.live.room.
    • Room descriptor WRD1, signed by the room authority; its SHA-256 digest is the room id every WEV1 event names. It fixes t0, the clock key (the authority's own, or a relay's acting for it), a tick for grant exchanges, the authority's key-log origin, roles mapped to capability sets (publish per media kind, subscribe up to max_layer, the event kinds as live-events' bitmap, and the moderate / direct / compose / record powers), limits (participants, publishers, a WEP1 event ceiling no grant exceeds, a re-validation interval), slots, publish profiles, the review policy (deadline plus fallback; fields and meaning only) and the recording policy with a region pin (ISO 3166-1 alpha-2) for data residency.
    • Room grant WRG1, signed by the authority: room, principal, role and caps, nbf/exp (at most 14 days), max_layer, precedence, origins, a single-use nonce once, a viewer id for revocation, the embedded WEP1 policy (allowed kinds, payload and text bounds, rate windows), joules_ceiling, funds_ceiling with its ISO 4217 currency, the profiles it publishes with, and at most 1 KB of composition attributes (featured, order, pip). Eight ordered checks, each with its reason (§4.3).
    • How a receipt names a grant (§4.5): the existing grant reference (grant_hash, capability = wai.live.room, joule_ceiling_micro, funds_ceiling), as package and playlist receipts already write it.
    • Grant exchange (§4.6): a new grant chained by prev to the old one, same room and principal, effective at a tick, recorded as L1's grant_exchange lifecycle event; an exchange may not leave the principal publishing what the new grant forbids.
    • Revocation through the existing key log (§5): the authority's key is a key-log entry with the new authority live/room; a grant is revoked by listing its digest in the head's revoked_modules, a viewer by listing its tag SHA-256("wai:live-viewer\x01" ‖ viewer). The room verifier takes the head the caller reached (jwp-receipts §7.4 step 3) and holds it to §7.2 rules 1–3.
    • Track naming (§6): MOQT Full Track Name with namespace (room, principal or _<slot>, media kind or events) and the layer as the Track Name. Every byte is in [a-z0-9_], so MOQT -22 §8.8's rendering is the bytes themselves; an L1 anchor's track digest takes that rendering.
    • Precedence and redundancy (§7): a slot is a virtual track; a higher precedence takes it over with no new session; with redundancy 2 a standby takes it on failover once failover_ms has passed since the live publisher's last_seen. The detail of every L1 lifecycle kind is defined, with the check order of each.
    • Publish profiles (§8) as data: speech, music (stereo, fullband 48 kHz, no echo cancellation / noise suppression / gain control, no DTX, a 128 kbps floor), screen (L1T3), camera-720, camera-1080; a profile under a registered name must equal the registered record.
    • Room verification (§9): merge every principal's chain by room clock (room keys first at equal t, each chain's own order kept), verify every event with L1's verifier under the policy of the grant in effect at its t, replay the lifecycle into room state (present, published tracks, slot live/standby with the current precedence holder, the timeline of active grants), and refuse with a named reason.
    • Bindings (§10), as mapping tables: CTA-5007-B (CWT claims by IANA key, 308–323 and the standard ones), draft-ietf-moq-c4m-01's moqt claim (default-deny, re-validation via moqt-reval = the descriptor's reval), RFC 9246 URI Signing, and draft-ietf-moq-privacy-pass-auth-03 for viewers that need no identity.
  • wai/wai-rs/src/live_room.rs, feature live_room = live_events + key_discovery (no new dependency; Ed25519 through crate::sig::verify_strict, SHA-256, the key log's Revision, L1's RoomVerifier). cbindgen:ignore, like live_events: include/wai.h is unchanged (regenerated on the build host after touching cbindgen.toml: no diff).
  • wai/live-conformance/rooms/: vectors.json from fixed seeds (wai_live_room_vectors gen), README with the provenance line.
    • Accepted: a lesson room (director, performer, audience, the director's remote record_start/record_stop; review and recording policies; a key-log head revoking a grant and a viewer the room never admits), a broadcast room (one publisher, viewers voting, a moderator's decision; no key log, authority as its own clock), a takeover, a redundant pair with failover, and an exchange promoting a viewer to publisher. Plus one gap vector.
    • Refused: every reason of §11 at least once, each a single-defect control, plus the L1 codes a descriptor, grant or record of a room raises.
    • Each accepted vector states the room id, grant digests, the merged order with the grant each record was verified under, the room state with the reachable track names, the tally, and each grant's moqt scopes.
  • wai/live-conformance/live_rooms_verify.py: standard library only, run with -I; strict Ed25519 from claim-conformance/_ed25519.py, BLAKE3 from _blake3.py (key-log commitments); every event verified by L1's own second implementation live_events_verify.py. It shares no code with wai-rs and agrees on every vector, reason, place, order, state, tally and scope; it also rebuilds the registered profiles from §8.2's table and compares them with the corpus. Mutating the corpus's state, tally, scopes, order or refusal place makes it exit 1 (checked by hand on altered copies).
  • Registry and CI: SPEC §5 paragraph and the record list; REGISTRY prose; wai registry export re-run (wai.live.room, magics WRD1 and WRG1); CHANGELOG entry; jwp-receipts §7.2 (revoked_modules also holds room grants and viewers), §7.5 (live/room authority) and §7.6; a step in the independent-verifiers job of wai-conformance.yml (unit tests, tests/live_room.rs, the Python verifier) and wai/extensions/live-rooms.md in both path lists; [[test]] live_room with required-features = ["live_room"].

Decisions worth a look

  • The layer is the Track Name, not a fourth namespace field. moq-streaming-format §4.1 requires a staged set's tracks to share one namespace, which a per-layer namespace field would break. The full tuple is still room / principal / kind / layer.
  • Revocation reuses revoked_modules rather than adding a member to the key-log revision (which rule 1's exact-members check would refuse in every existing reader). Grant digests and viewer tags are SHA-256 values under their own domains, so they cannot collide with module digests; the jwp-receipts text now says the list holds all three kinds.
  • Revocation is timeless, like a key's: a revoked grant is refused at every use, including in an after-the-fact replay. Ending a principal's participation at a time is leave, not revocation.
  • CAT encoding: not implemented. The crate has no CBOR or COSE, and CTA-5007-B's claim value syntaxes are not restated here; the CAT table maps claims by name and IANA key. What is implemented is the moqt claim's scope list (draft-ietf-moq-c4m-01 §2.1) as data, derived from each grant and checked by both implementations.

Build and test (all through rb on the build host)

The build host had rebooted shortly before this work (ssh timed out on the first warm-up attempt); every run below completed. Cargo output went to log files on the host and was grepped there; each cargo command's own exit status is shown.

command (in wai/wai-rs, --no-default-features) exit
cargo check --lib --tests --bins --features live_room 0
cargo run --features live_room --bin wai_live_room_vectors -- gen ../live-conformance/rooms 101, then 0: the generator's own assertion caught a vector written with the clock's t going back; fixed and regenerated
cargo test --features live_room --lib live_room:: 0 (6 passed)
cargo test --features live_room --test live_room 0 (4 passed: regenerates byte for byte, every outcome, every reason covered, §11 equals Reason::ALL)
cargo test --features live_events --lib live_events:: and --test live_events 0, 0 (L1 unchanged)
cargo test --lib codecs::registry 101 before the export (expected: the committed export was stale), 0 after
cargo run --bin wai -- registry export, then ... --check 0, 0
cargo test --test carriage --test manifest_builders --test cli_wrap_intent --test cli_registry --test corpus_provenance 0
cargo test --lib --features world,audio_scene,haptic,splat4d,score,provenance,neural_int,film,oer,receipt_claims,key_discovery,staged,video_int,audio_int,splat_int,stage_measure,telemetry,video_package,http (the CI lib set) 0 (833 passed)
cargo run --features live_room --bin wai_live_room_vectors -- verify ../live-conformance/rooms 0
cargo clippy --features live_room --lib --bin wai_live_room_vectors --test live_room 0; three lints in the new module fixed, none left in it
python3 -I live-conformance/live_rooms_verify.py live-conformance/rooms 0
touch cbindgen.toml then a build: git status include/ clean

Repository checks, run locally: check-tests-in-ci, check-spec-refs, check-wai-section-refs, check-no-vanity-metrics, check-comparative-prose, check-workflow-concurrency, check-lockfiles, and the pr-touches-paths self-test: all exit 0. check-public-names.sh was not run (it needs the private denylist); the changed files were checked by hand for names.

Deferred

  • L3 (wai.live.compose): what featured, order and pip mean, the layout function, and the compose power's object. This slice signs the attributes and checks their syntax only.
  • L4 (wai.capture.take): the take_commit payload, the take a record_start/record_stop pair brackets, and consent. This slice gives record_start/record_stop to the record power only.
  • L5 (network reference): carrying grants and CAT/moqt tokens on the wire (MOQT AUTHORIZATION TOKEN), a relay that enforces scopes, re-validates against key status and records takeover/failover from real media, and the CBOR/COSE encoding of a CAT.
  • Also later: the review workflow and its statement of reasons (L12), checking a recording's storage region against the pin (L7), and per-grant metering against joules_ceiling/funds_ceiling (L9).

🤖 Generated with Claude Code

Closed: landed in main through #289 (main 13360b4e), which contains this branch's head 440f7dae unchanged. #289 also adds two fields to the recording policy (commit_interval_ms, jitter_ms), so the room ids in the corpus as merged differ from this branch's.

**Stacked on #279** (`wai/live-events`, head `defa48c0`). This branch was cut from `origin/wai/live-events`, not from main; its base here is main only because the forge's PR tool opens every PR against main, so the diff below includes #279's commits until #279 lands. It lands through the top of the stack: merge #279 first, then this. Do not merge this one on its own. ## What this is Slice L2 of WAI's live and interactive work: `wai.live.room`, a spec, a reference implementation, a conformance corpus and an independent verifier. - **`wai/extensions/live-rooms.md`** registers the record `wai.live.room`. - **Room descriptor `WRD1`**, signed by the room authority; its SHA-256 digest is the room id every `WEV1` event names. It fixes `t0`, the clock key (the authority's own, or a relay's acting for it), a tick for grant exchanges, the authority's key-log origin, roles mapped to capability sets (publish per media kind, subscribe up to `max_layer`, the event kinds as live-events' bitmap, and the moderate / direct / compose / record powers), limits (participants, publishers, a `WEP1` event ceiling no grant exceeds, a re-validation interval), slots, publish profiles, the review policy (deadline plus fallback; fields and meaning only) and the recording policy with a **region pin** (ISO 3166-1 alpha-2) for data residency. - **Room grant `WRG1`**, signed by the authority: room, principal, role and caps, `nbf`/`exp` (at most 14 days), `max_layer`, `precedence`, `origins`, a single-use nonce `once`, a `viewer` id for revocation, the embedded **`WEP1` policy** (allowed kinds, payload and text bounds, rate windows), `joules_ceiling`, `funds_ceiling` with its ISO 4217 currency, the profiles it publishes with, and at most 1 KB of composition attributes (`featured`, `order`, `pip`). Eight ordered checks, each with its reason (§4.3). - **How a receipt names a grant** (§4.5): the existing grant reference (`grant_hash`, `capability` = `wai.live.room`, `joule_ceiling_micro`, `funds_ceiling`), as package and playlist receipts already write it. - **Grant exchange** (§4.6): a new grant chained by `prev` to the old one, same room and principal, effective at a tick, recorded as L1's `grant_exchange` lifecycle event; an exchange may not leave the principal publishing what the new grant forbids. - **Revocation through the existing key log** (§5): the authority's key is a key-log entry with the new authority `live/room`; a grant is revoked by listing its digest in the head's `revoked_modules`, a viewer by listing its tag `SHA-256("wai:live-viewer\x01" ‖ viewer)`. The room verifier takes the head the caller reached (jwp-receipts §7.4 step 3) and holds it to §7.2 rules 1–3. - **Track naming** (§6): MOQT Full Track Name with namespace (room, principal or `_<slot>`, media kind or `events`) and the **layer as the Track Name**. Every byte is in `[a-z0-9_]`, so MOQT -22 §8.8's rendering is the bytes themselves; an L1 anchor's `track` digest takes that rendering. - **Precedence and redundancy** (§7): a slot is a virtual track; a higher `precedence` takes it over with no new session; with redundancy 2 a standby takes it on failover once `failover_ms` has passed since the live publisher's `last_seen`. The `detail` of every L1 lifecycle kind is defined, with the check order of each. - **Publish profiles** (§8) as data: `speech`, `music` (stereo, fullband 48 kHz, no echo cancellation / noise suppression / gain control, no DTX, a 128 kbps floor), `screen` (L1T3), `camera-720`, `camera-1080`; a profile under a registered name must equal the registered record. - **Room verification** (§9): merge every principal's chain by room clock (room keys first at equal `t`, each chain's own order kept), verify every event with L1's verifier under the policy of the grant in effect at its `t`, replay the lifecycle into room state (present, published tracks, slot live/standby with the current precedence holder, the timeline of active grants), and refuse with a named reason. - **Bindings** (§10), as mapping tables: CTA-5007-B (CWT claims by IANA key, 308–323 and the standard ones), `draft-ietf-moq-c4m-01`'s `moqt` claim (default-deny, re-validation via `moqt-reval` = the descriptor's `reval`), RFC 9246 URI Signing, and `draft-ietf-moq-privacy-pass-auth-03` for viewers that need no identity. - **`wai/wai-rs/src/live_room.rs`**, feature `live_room` = `live_events` + `key_discovery` (no new dependency; Ed25519 through `crate::sig::verify_strict`, SHA-256, the key log's `Revision`, L1's `RoomVerifier`). `cbindgen:ignore`, like `live_events`: `include/wai.h` is unchanged (regenerated on the build host after touching `cbindgen.toml`: no diff). - **`wai/live-conformance/rooms/`**: `vectors.json` from fixed seeds (`wai_live_room_vectors gen`), README with the provenance line. - Accepted: a lesson room (director, performer, audience, the director's remote `record_start`/`record_stop`; review and recording policies; a key-log head revoking a grant and a viewer the room never admits), a broadcast room (one publisher, viewers voting, a moderator's decision; no key log, authority as its own clock), a takeover, a redundant pair with failover, and an exchange promoting a viewer to publisher. Plus one gap vector. - Refused: every reason of §11 at least once, each a single-defect control, plus the L1 codes a descriptor, grant or record of a room raises. - Each accepted vector states the room id, grant digests, the merged order with the grant each record was verified under, the room state with the reachable track names, the tally, and each grant's `moqt` scopes. - **`wai/live-conformance/live_rooms_verify.py`**: standard library only, run with `-I`; strict Ed25519 from `claim-conformance/_ed25519.py`, BLAKE3 from `_blake3.py` (key-log commitments); every event verified by L1's own second implementation `live_events_verify.py`. It shares no code with `wai-rs` and agrees on every vector, reason, place, order, state, tally and scope; it also rebuilds the registered profiles from §8.2's table and compares them with the corpus. Mutating the corpus's state, tally, scopes, order or refusal place makes it exit 1 (checked by hand on altered copies). - **Registry and CI**: SPEC §5 paragraph and the record list; REGISTRY prose; `wai registry export` re-run (`wai.live.room`, magics `WRD1` and `WRG1`); CHANGELOG entry; jwp-receipts §7.2 (`revoked_modules` also holds room grants and viewers), §7.5 (`live/room` authority) and §7.6; a step in the independent-verifiers job of `wai-conformance.yml` (unit tests, `tests/live_room.rs`, the Python verifier) and `wai/extensions/live-rooms.md` in both path lists; `[[test]] live_room` with `required-features = ["live_room"]`. ## Decisions worth a look - **The layer is the Track Name, not a fourth namespace field.** moq-streaming-format §4.1 requires a staged set's tracks to share one namespace, which a per-layer namespace field would break. The full tuple is still room / principal / kind / layer. - **Revocation reuses `revoked_modules`** rather than adding a member to the key-log revision (which rule 1's exact-members check would refuse in every existing reader). Grant digests and viewer tags are SHA-256 values under their own domains, so they cannot collide with module digests; the jwp-receipts text now says the list holds all three kinds. - **Revocation is timeless, like a key's**: a revoked grant is refused at every use, including in an after-the-fact replay. Ending a principal's participation at a time is `leave`, not revocation. - **CAT encoding: not implemented.** The crate has no CBOR or COSE, and CTA-5007-B's claim value syntaxes are not restated here; the CAT table maps claims by name and IANA key. What is implemented is the `moqt` claim's scope list (`draft-ietf-moq-c4m-01` §2.1) as data, derived from each grant and checked by both implementations. ## Build and test (all through `rb` on the build host) The build host had rebooted shortly before this work (ssh timed out on the first warm-up attempt); every run below completed. Cargo output went to log files on the host and was grepped there; each cargo command's own exit status is shown. | command (in `wai/wai-rs`, `--no-default-features`) | exit | |---|---| | `cargo check --lib --tests --bins --features live_room` | 0 | | `cargo run --features live_room --bin wai_live_room_vectors -- gen ../live-conformance/rooms` | 101, then 0: the generator's own assertion caught a vector written with the clock's `t` going back; fixed and regenerated | | `cargo test --features live_room --lib live_room::` | 0 (6 passed) | | `cargo test --features live_room --test live_room` | 0 (4 passed: regenerates byte for byte, every outcome, every reason covered, §11 equals `Reason::ALL`) | | `cargo test --features live_events --lib live_events::` and `--test live_events` | 0, 0 (L1 unchanged) | | `cargo test --lib codecs::registry` | 101 before the export (expected: the committed export was stale), 0 after | | `cargo run --bin wai -- registry export`, then `... --check` | 0, 0 | | `cargo test --test carriage --test manifest_builders --test cli_wrap_intent --test cli_registry --test corpus_provenance` | 0 | | `cargo test --lib --features world,audio_scene,haptic,splat4d,score,provenance,neural_int,film,oer,receipt_claims,key_discovery,staged,video_int,audio_int,splat_int,stage_measure,telemetry,video_package,http` (the CI lib set) | 0 (833 passed) | | `cargo run --features live_room --bin wai_live_room_vectors -- verify ../live-conformance/rooms` | 0 | | `cargo clippy --features live_room --lib --bin wai_live_room_vectors --test live_room` | 0; three lints in the new module fixed, none left in it | | `python3 -I live-conformance/live_rooms_verify.py live-conformance/rooms` | 0 | | `touch cbindgen.toml` then a build: `git status include/` | clean | Repository checks, run locally: `check-tests-in-ci`, `check-spec-refs`, `check-wai-section-refs`, `check-no-vanity-metrics`, `check-comparative-prose`, `check-workflow-concurrency`, `check-lockfiles`, and the `pr-touches-paths` self-test: all exit 0. `check-public-names.sh` was not run (it needs the private denylist); the changed files were checked by hand for names. ## Deferred - **L3 (`wai.live.compose`)**: what `featured`, `order` and `pip` mean, the layout function, and the compose power's object. This slice signs the attributes and checks their syntax only. - **L4 (`wai.capture.take`)**: the `take_commit` payload, the take a `record_start`/`record_stop` pair brackets, and consent. This slice gives `record_start`/`record_stop` to the record power only. - **L5 (network reference)**: carrying grants and CAT/`moqt` tokens on the wire (MOQT `AUTHORIZATION TOKEN`), a relay that enforces scopes, re-validates against key status and records `takeover`/`failover` from real media, and the CBOR/COSE encoding of a CAT. - Also later: the review workflow and its statement of reasons (L12), checking a recording's storage region against the pin (L7), and per-grant metering against `joules_ceiling`/`funds_ceiling` (L9). 🤖 Generated with [Claude Code](https://claude.com/claude-code) --- **Closed:** landed in main through #289 (main 13360b4e), which contains this branch's head 440f7dae unchanged. #289 also adds two fields to the recording policy (commit_interval_ms, jitter_ms), so the room ids in the corpus as merged differ from this branch's. 
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai: live-conformance/README.md, with the corpus's provenance
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8a58f94bb6 
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai: live_events stays out of include/wai.h
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defa48c0b5 
Its constants (VERSION, IN, OUT, BREAK, CHAT and the rest) are Rust-only. As bare
macros they would collide in any C program that includes wai.h beside a platform
header or a build-wide -DVERSION. The module is cbindgen:ignore; the header is
regenerated and is back to main's.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The extension text, the second implementation of the room verifier, the registry entries
for wai.live.room (WRD1, WRG1), the live/room key-log authority and grant revocation in
jwp-receipts §7, the CHANGELOG entry, and the CI step beside live events.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai: live-rooms.md, once, viewer scope, iss and the moqt media name made exact
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6ec91d6c5a 
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Merge origin/main into wai/live-rooms; live-conformance declares it has no decoded output
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440f7dae29 
The cargo-class corpora job's every_decoded_output_states_a_sha256 requires each
*-conformance directory to carry a sha256.json or be excluded with a reason.
live-conformance (L1's events, L2's rooms, L4's takes to come) holds signed
records, commitments and verdicts, never a decoded output, so it joins the
exclusions beside the claim, JWP and signer corpora. CHANGELOG: both sides'
entries kept.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
dcharlot closed this pull request 2026-10-17 09:23:27 -04:00
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