# Client-Control Plane Wire Contract

## 계약 메타

- id: `iop.client-control-plane-wire`
- boundary: `inner`
- status: active-mvp
- 원본 경로:
  - `proto/iop/control.proto`
  - `apps/control-plane/internal/wire/wire.go`
  - `apps/control-plane/internal/wire/client.go`
  - `apps/control-plane/cmd/control-plane/credential_http_handlers.go`
  - `apps/control-plane/cmd/control-plane/credential_commands.go`
  - `apps/client/lib/iop_wire/client_wire_client.dart`
  - `apps/client/lib/iop_wire/parser_map.dart`
- human docs:
  - `apps/control-plane/README.md`
  - `apps/client/README.md`

## 읽는 조건

- Client `/client` WebSocket proto-socket endpoint를 바꿀 때
- `ClientHelloRequest` 또는 `ClientHelloResponse`를 바꿀 때
- Client가 Control Plane을 통해 Edge/Node 운영 상태를 관찰하는 wire baseline을 검토할 때
- principal bootstrap, credential-slot/route HTTPS lifecycle, or client-facing credential ownership changes

## 범위

Client protobuf wire는 hello-only를 유지하고, post-bootstrap slot write는 server-authenticated HTTPS와 principal auth로 수행한다.
최초 principal/bootstrap은 계속 host-local CLI 전용이며 remote wire에 노출하지 않는다.

## 주요 흐름

- Client는 `/client` WebSocket으로 Control Plane에 연결한다.
- Client가 `ClientHelloRequest`를 보내면 Control Plane은 `ClientHelloResponse`로 readiness, protocol, server time, message를 응답한다.
- Control Plane listen 주소는 server config와 `IOP_WIRE_LISTEN`/compose port 기준으로 주입한다.

## Credential HTTPS boundary

- Principal bootstrap is an offline, host-local CLI operation. It returns the raw IOP token once; no WebSocket or remote HTTP bootstrap route exists.
- Post-bootstrap slot and route lifecycle uses the dedicated credential HTTPS listener only. The listener presents the configured server certificate, and callers validate its CA and server name.
- Every credential request requires `Authorization: Bearer <IOP token>`. Slot create and rotate accept the provider secret only as an `application/octet-stream` body; list, disable, enable, revoke, and route operations never return provider plaintext.
- Slot mutations and `POST /v1/credentials/routes/{route_id}/update` use an explicit `IOP-Expected-Revision`. Route update accepts the complete slot/alias/profile/upstream/resource-selector binding as JSON and applies it with CAS. A successful mutation rebuilds the secret-free principal projection and synchronizes it to connected managed Edges before the operation is treated as complete.
- TLS private keys, the at-rest encryption keyring, the lease issuer private key, and raw principal/provider credentials are external mounts. They are never tracked config or Client wire fields.

## 필드 의미

- `ClientHelloRequest.client_id`: client instance 식별자다.
- `ClientHelloRequest.client_version`: client build/version 관찰값이다.
- `ClientHelloResponse.ready`: Control Plane이 client 요청을 받을 수 있는지 나타낸다.
- `ClientHelloResponse.protocol`: 현재 `protobuf-socket` 값을 사용한다.
- `server_time_unix_nano`: client가 Control Plane time 기준을 관찰하는 값이다.

## 금지 사항

- Client가 Edge나 Node 내부 TCP/protobuf transport에 직접 연결하는 계약을 만들지 않는다.
- Client를 특정 외부 제품 shell 또는 navigation 계약으로 고정하지 않는다.
- Client wire에 실제 환경 endpoint, credential, private host 값을 tracked 문서로 기록하지 않는다.
- Dart protobuf 생성물을 proto 원본과 불일치하게 두지 않는다.
- 최초 principal/bootstrap을 remote wire나 Client WebSocket에 노출하지 않는다. post-bootstrap credential slot write는 server-authenticated HTTPS credential-plane listener와 principal auth token으로만 수행하며, raw provider secret은 request body로 한 번만 전달되고 저장되지 않는다.
- Do not reuse the Client hello WebSocket as a credential transport, and do not expose ciphertext, lease envelopes, raw tokens, private keys, or provider credentials through Client responses.

## 변경 시 확인할 코드/테스트

- `proto/iop/control.proto`
- `apps/control-plane/internal/wire/client_test.go`
- `apps/client/test/iop_wire/client_wire_client_test.dart`
- `apps/client/test/iop_wire/parser_map_test.dart`
- `apps/control-plane/internal/credentialops/service_test.go`
- `apps/control-plane/cmd/control-plane/credential_http_handlers_test.go`
- `apps/control-plane/cmd/control-plane/credential_store_test.go`
- `apps/control-plane/cmd/control-plane/secure_delivery_integration_test.go`
- proto 변경 시 `make proto`와 `make proto-dart`
