docs(nestsClient): Phase 3b-2 Kwik integration plan in stub
Phase 3b-2 attempt. The honest version: I do not have network access to verify Kwik's current Maven coordinates or test against a live nests server, so committing speculative QUIC + Extended CONNECT code risks breaking the build for everyone else without giving us audible-audio-on-device confidence in return. What I did instead: expanded the docstring on KwikWebTransportFactory into a full integration playbook that the next person picking this up can execute directly. It covers: - Maven coordinates to verify (`tech.kwik:kwik-core` + `tech.kwik:flupke`, with `net.luminis.quic:kwik` as the legacy fallback group). - The exact `gradle/libs.versions.toml` + `nestsClient/build.gradle.kts` edits to drop in once coords are confirmed. - Step-by-step handshake sequence with the right HTTP/3 setting IDs: * SETTINGS_ENABLE_CONNECT_PROTOCOL=1 (RFC 8441, 0x08) * SETTINGS_ENABLE_WEBTRANSPORT=1 (WT-H3 draft, 0x2b603742) * SETTINGS_H3_DATAGRAM=1 (RFC 9297, 0x33) - Extended CONNECT pseudo-header set, including the legacy `sec-webtransport-http3-draft02 = 1` for older server compat. - WebTransport stream-type prefix bytes (0x41 for client bidi, 0x54 for client uni) + WT capsule type for graceful close (0x2843). - Test strategy: validate against local nests-rs first, then the production `nostrnests.com`. - Open questions (Flupke Extended CONNECT maturity, draft churn, dev-only self-signed-cert support, Android API surface). Behavior unchanged: connect() still throws WebTransportException with Kind.NotImplemented and a message pointing at this docstring. When the real implementation lands, no upstream caller needs to change — the AudioRoomConnectionViewModel from Phase 3d-3 will auto-light up the connection chip from "Failed: NotImplemented" to "Connected" and start producing audio through the Phase 3d-1 pipeline that's already wired. https://claude.ai/code/session_013nVLALALKaHVgHm9u5Cg8D
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Claude
@@ -63,6 +63,9 @@ kotlin {
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androidMain {
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dependsOn(jvmAndroid)
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// Kwik QUIC + Flupke HTTP/3 dependencies are NOT yet declared.
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// See KwikWebTransportFactory.kt for the integration plan and
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// validated Maven coordinates / minimum versions before adding.
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}
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jvmTest {
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+130
-18
@@ -21,25 +21,134 @@
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package com.vitorpamplona.nestsclient.transport
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/**
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* JVM + Android [WebTransportFactory] that will wrap the Kwik QUIC library
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* (plus Flupke for HTTP/3) once the Extended CONNECT handshake lands.
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* JVM + Android [WebTransportFactory] that **will** wrap the Kwik QUIC library
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* (plus Flupke for HTTP/3) once the Extended CONNECT handshake lands. Until
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* then, [connect] throws [WebTransportException] with
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* [WebTransportException.Kind.NotImplemented].
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*
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* **Status:** Phase 3b-1 only ships the interface contract — calling
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* [connect] throws [WebTransportException] with
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* [WebTransportException.Kind.NotImplemented]. This lets the Phase 3c MoQ
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* framing layer develop and test against a stable [WebTransportSession]
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* abstraction (see [FakeWebTransport]) while the real Kwik integration is
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* delivered in Phase 3b-2.
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* The Phase 3c MoQ framing layer + Phase 3d audio pipeline + Phase 3d-3
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* `AudioRoomConnectionViewModel` are all wired against the
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* [WebTransportSession] interface, so the moment this class returns a real
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* session the entire stack starts producing audible output without further
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* changes upstream.
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*
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* The expected implementation sequence:
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* 1. QUIC dial via Kwik with ALPN "h3" to `authority`.
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* 2. HTTP/3 SETTINGS exchange including `SETTINGS_ENABLE_CONNECT_PROTOCOL=1`
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* and the WebTransport draft's `SETTINGS_ENABLE_WEBTRANSPORT=1`.
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* 3. Extended CONNECT request: `:method=CONNECT :protocol=webtransport
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* :scheme=https :authority=<host> :path=<path>` plus
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* `Authorization: Bearer <bearerToken>` when supplied.
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* 4. On 2xx, wrap the resulting bidi streams / datagrams in WebTransport
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* framing (stream type 0x54 for client-initiated bidi).
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* ## Phase 3b-2 integration plan
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*
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* ### 1. Maven coordinates (verify before adding)
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*
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* Kwik is published by Peter Doornbosch (kwik.tech). As of writing the
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* coordinates appear to be `tech.kwik:kwik-core` and `tech.kwik:flupke` but
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* **this needs verification on the live Maven Central index** — earlier
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* versions used different group IDs. Suggested verification command:
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*
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* ```
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* curl -sf https://repo1.maven.org/maven2/tech/kwik/kwik-core/maven-metadata.xml
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* curl -sf https://repo1.maven.org/maven2/tech/kwik/flupke/maven-metadata.xml
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* ```
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*
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* Known-good versions to try (newest first): 0.11.x, 0.10.x, 0.9.x.
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*
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* If the `tech.kwik` group fails, fall back to `net.luminis.quic:kwik` (the
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* pre-2024 group) but pin to the latest 0.x release on that group.
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*
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* Add to `gradle/libs.versions.toml`:
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* ```toml
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* [versions]
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* kwik = "0.11.0" # confirm against maven-metadata.xml first
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*
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* [libraries]
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* kwik-core = { group = "tech.kwik", name = "kwik-core", version.ref = "kwik" }
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* kwik-flupke = { group = "tech.kwik", name = "flupke", version.ref = "kwik" }
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* ```
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*
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* Add to `nestsClient/build.gradle.kts` under `androidMain.dependencies`:
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* ```kotlin
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* implementation(libs.kwik.core)
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* implementation(libs.kwik.flupke)
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* ```
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*
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* Kwik is pure Java with no JNI; both Android and JVM-desktop targets work.
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*
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* ### 2. Handshake sequence
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*
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* a. **Resolve UDP socket** to `(authority host, authority port)` — port
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* defaults to 443 for `https`/`wss` URLs.
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* b. **QUIC dial** with ALPN list `["h3"]` (HTTP/3) via Kwik's connection
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* builder. Kwik uses TLS 1.3; pass an `SSLContext` that accepts standard
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* CA-issued certs (nests deployments use Let's Encrypt).
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* c. **HTTP/3 SETTINGS** exchange via Flupke. Send a control stream with:
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* - `SETTINGS_ENABLE_CONNECT_PROTOCOL = 1` (RFC 8441, identifier 0x08)
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* - `SETTINGS_ENABLE_WEBTRANSPORT = 1` (WebTransport-H3 draft, identifier 0x2b603742)
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* - `SETTINGS_H3_DATAGRAM = 1` (RFC 9297, identifier 0x33)
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* Wait for the peer's SETTINGS frame; verify it advertises the same
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* WebTransport setting before proceeding.
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* d. **Extended CONNECT** request on a new client-bidi stream, as
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* compressed HEADERS:
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* - `:method = CONNECT`
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* - `:protocol = webtransport`
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* - `:scheme = https`
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* - `:authority = <host>` (or `<host>:<port>` if non-default)
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* - `:path = <path>` (defaults to `/`, nests uses `/moq`)
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* - `Authorization: Bearer <bearerToken>` if non-null
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* - `sec-webtransport-http3-draft02 = 1` for legacy server compat
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* Read the response HEADERS; on `:status = 2xx` the session is open.
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* On 4xx / 5xx throw [WebTransportException] with
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* [WebTransportException.Kind.ConnectRejected].
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*
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* ### 3. Stream / datagram multiplexing
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*
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* - **Bidi WT streams**: client opens a QUIC bidi stream; first VarInt
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* written is the WT stream-type signal `0x41` followed by the WT session
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* ID (the stream ID of the CONNECT bidi). Bytes that follow are
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* application data (MoQ frames, in our case).
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* - **Uni WT streams** (used by MoQ for OBJECT_STREAM): client opens a
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* QUIC uni stream; first VarInt is `0x54` then the WT session ID.
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* - **WT datagrams** (used by MoQ for OBJECT_DATAGRAM): wrap each app
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* payload in an HTTP/3 DATAGRAM (RFC 9297) with the WT quarter-stream-id
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* prefix, then push via Kwik's QUIC datagram API.
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*
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* Inbound peer-initiated streams: detect WT type bytes, route to either
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* the [WebTransportSession.incomingUniStreams] flow or the (Phase 3b-3 if
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* needed) bidi-stream flow.
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*
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* ### 4. Lifecycle
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*
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* - Spawn one coroutine to demux inbound QUIC streams into WT
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* bidi/uni/datagram channels.
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* - On [WebTransportSession.close], send a `WEBTRANSPORT_SESSION_CLOSE`
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* capsule (an HTTP/3 capsule of type 0x2843) on the CONNECT bidi, then
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* `connection.close()` on the underlying Kwik QUIC connection.
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*
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* ### 5. Test strategy
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*
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* - Unit-test the WT framing helpers (varint stream-type prefix, capsule
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* encode/decode) in `commonTest` before touching Kwik.
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* - Instrumented `@LargeTest` against `nostrnests.com`:
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* ```
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* val factory = KwikWebTransportFactory()
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* val session = factory.connect("nostrnests.com", "/moq")
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* assertTrue(session.isOpen)
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* session.sendDatagram(byteArrayOf(0x40)) // CLIENT_SETUP varint
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* session.close()
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* ```
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* - Validate against the nests-rs reference server first (run locally with
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* `cargo run` from the `nests` repo) before targeting production
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* `nostrnests.com` — easier to read the server-side logs.
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*
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* ### Risks / open questions
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*
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* - **Kwik HTTP/3 (Flupke) maturity**: Flupke is functional but its
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* Extended CONNECT support has not been tested against WebTransport in
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* the field as far as the maintainer's docs go. Worst case: build the
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* CONNECT request manually using Kwik's lower-level HTTP/3 frame API.
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* - **Draft churn**: WebTransport-H3 is a moving target. Pin to
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* `draft-02` (or whatever nests serves at integration time) and
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* advertise both legacy and current setting IDs.
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* - **Self-signed certs in dev**: nests' local docker compose ships a
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* self-signed cert; expose a `trustAllCerts: Boolean` constructor flag
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* for development builds (NOT in release).
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* - **Android API**: Kwik uses [DatagramChannel] + [SocketAddress] which
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* work on Android. No JNI / no Cronet, so APK size impact is small.
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*/
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class KwikWebTransportFactory : WebTransportFactory {
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override suspend fun connect(
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@@ -49,6 +158,9 @@ class KwikWebTransportFactory : WebTransportFactory {
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): WebTransportSession =
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throw WebTransportException(
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kind = WebTransportException.Kind.NotImplemented,
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message = "Kwik-backed WebTransport handshake lands in Phase 3b-2",
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message =
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"Kwik-backed WebTransport handshake not yet implemented. " +
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"See KwikWebTransportFactory.kt header for the integration plan " +
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"(Maven coords, handshake sequence, stream/datagram framing, test strategy).",
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)
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}
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