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[M5] mxaccess-asb: F25 step 7 — Disconnect closes the session lifecycle

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Mirrors `AsbContracts.cs:109-114` — same payload shape as
AuthenticateMe (Data + InitializationVector under
ConsumerAuthenticationData) but under the `<DisconnectRequest>`
wrapper. Sent one-way + signed (regular HMAC, no force) per
`AsbContracts.cs:22` (`IsOneWay = true`).

API additions:
* `build_disconnect_request_body(data, iv)` — NBFX token stream for
  the DisconnectRequest body.
* `AsbClient::disconnect()` — builds a fresh encrypted
  authentication-data blob via F23's `create_authentication_data()`
  (encrypts `local_pub || remote_pub` under the derived AES key
  with a fresh IV), wraps it in a DisconnectRequest, sends one-way
  signed.

2 new tests:
* `disconnect_request_carries_data_and_iv_under_correct_wrapper` —
  outer element name + Data/IV byte-payload order.
* `disconnect_writes_signed_one_way_envelope` — end-to-end via
  `tokio::io::duplex` peer; verifies the SizedEnvelope payload
  contains the `:disconnectIn` action string.

With Disconnect landed, AsbClient now covers the full session
lifecycle:
  send_preamble → connect → register_items / read / keep_alive
  / unregister_items → disconnect → send_end → stream shutdown

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Joseph Doherty
2026-05-05 11:51:39 -04:00
parent 321b7963a4
commit 1b1ee1e0b7
4 changed files with 152 additions and 6 deletions
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rust/crates/mxaccess-asb/src/lib.rs
+4 -3
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@@ -27,7 +27,8 @@ pub use envelope::{
pub use operations::{
AuthenticationDataBytes, ConnectResponse, OperationError, ReadResponse, RegisterItemsResponse,
UnregisterItemsResponse, build_authenticate_me_request_body, build_connect_request_body,
build_keep_alive_request_body, build_read_request_body, build_register_items_request_body,
build_unregister_items_request_body, collect_asbidata_payloads, decode_connect_response,
decode_read_response, decode_register_items_response, decode_unregister_items_response,
build_disconnect_request_body, build_keep_alive_request_body, build_read_request_body,
build_register_items_request_body, build_unregister_items_request_body,
collect_asbidata_payloads, decode_connect_response, decode_read_response,
decode_register_items_response, decode_unregister_items_response,
};