---
phase: 03-hook-server
plan: 01
subsystem: api
tags: [http-hooks, claude-code, json, net-http, event-mapping]

requires:
  - phase: 02-daemon-et-i3-bridge
    provides: SessionRegistry, TrackedSession, Daemon, SessionInfo
provides:
  - HookEvent struct parsing Claude Code hook JSON
  - processHookEvent mapping 4 event types to State+WaitType
  - UpdateFromHook with auto-create and WaitingSince transitions
  - handleHook HTTP handler with POST validation and body size limit
  - SessionInfo.WaitType field for wait type discrimination
affects: [03-hook-server]

tech-stack:
  added: [net/http, net/http/httptest]
  patterns: [HTTP handler with MaxBytesReader, event-to-state mapping via switch]

key-files:
  created: [hook.go, hook_test.go]
  modified: [protocol.go, protocol_test.go]

key-decisions:
  - "WaitType omitempty: champ vide omis du JSON pour compatibilite avec les clients existants"
  - "UpdateFromHook separe de Update: les hooks ne connaissent pas PID/GitBranch/Preview, donc methode dediee qui ne touche que les champs connus"

patterns-established:
  - "Hook event mapping: switch sur HookEventName puis NotificationType pour determiner State+WaitType"
  - "HTTP handler pattern: method check, MaxBytesReader, JSON decode, process, 200 OK"

requirements-completed: [STATE-03]

duration: 3min
completed: 2026-03-23
---

# Phase 03 Plan 01: Hook Event Processing Summary

**HookEvent parsing, event-to-state mapping (Notification/Stop/PostToolUse/PreToolUse), UpdateFromHook avec auto-create, et HTTP handler POST /hook avec validation**

## Performance

- **Duration:** 3 min
- **Started:** 2026-03-23T18:38:37Z
- **Completed:** 2026-03-23T18:41:45Z
- **Tasks:** 2
- **Files modified:** 4

## Accomplishments
- HookEvent struct couvre tous les champs du payload Claude Code hooks
- processHookEvent mappe les 4 types d'events (Notification, Stop, PostToolUse, PreToolUse) vers State+WaitType
- UpdateFromHook gere les sessions inconnues et les transitions WaitingSince
- handleHook HTTP handler valide method, body size (64KB), et JSON
- 16 tests couvrent tous les cas

## Task Commits

1. **Task 1: HookEvent struct, processHookEvent mapping, UpdateFromHook, WaitType** - `e1b176c` (feat)
2. **Task 2: HTTP handler POST /hook avec validation et protection** - `5bec943` (feat)

## Files Created/Modified
- `hook.go` - HookEvent struct, handleHook HTTP handler, processHookEvent, UpdateFromHook
- `hook_test.go` - 16 tests (12 mapping + 4 HTTP handler)
- `protocol.go` - SessionInfo enrichi avec WaitType
- `protocol_test.go` - Test serialisation JSON de WaitType

## Decisions Made
- WaitType omitempty : le champ vide est omis du JSON pour ne pas casser les clients existants qui ignorent ce champ
- UpdateFromHook est une methode separee de Update car les hooks ne connaissent pas PID, GitBranch, Preview, Workspace, Label

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- hook.go fournit toute la logique de traitement. Le plan 03-02 peut integrer le HTTP server dans le Daemon (startHookServer, hookPort, poll slowdown).
- handleHook est pret a etre monte sur un http.ServeMux.

---
*Phase: 03-hook-server*
*Completed: 2026-03-23*

## Self-Check: PASSED