# LINE Channel Adapter Checklist

**Date:** 2026-02-16  
**Scope:** Close the first item in the LINE/Feishu/Zalo channel gap set by implementing LINE.

## Goal

Add a production-safe LINE channel adapter with webhook ingress, signature verification, outbound send path, mention/allowlist gating, and daemon/gateway wiring.

## Implemented

- Added new LINE adapter:
  - `src/channels/line/adapter.ts`
  - `src/channels/line/index.ts`
- Added webhook ingress on gateway:
  - `POST /line/events` routed to adapter handler.
- Added daemon registration:
  - config-driven adapter creation in `registerChannels()`
  - gateway webhook handler binding via `setLineHandler()`
- Added config schema:
  - `line.channel_access_token`
  - `line.channel_secret`
  - `line.allowed_source_ids`
  - `line.require_mention`
  - `line.mention_name`
- Added service discovery listing:
  - `line` channel now appears in `system.services`.
- Added docs/config examples:
  - `README.md`
  - `config/default.yaml`

## Security/Safety

- Verifies `x-line-signature` using HMAC-SHA256 + `channel_secret`.
- Applies source allowlist (`allowed_source_ids`) when configured.
- Applies mention gating (`require_mention` + `mention_name`) for group/room contexts.

## Tests

- `src/channels/line/adapter.test.ts`
  - inbound signature validation
  - mention gating behavior
  - outbound push API call
  - invalid signature rejection
- `src/daemon/channels.test.ts`
  - LINE adapter registration + gateway handler binding.
- `src/config/schema.test.ts`
  - LINE config parsing/defaults.
- `src/gateway/handlers/services.test.ts`
  - LINE service presence in discovery output.

## Validation Run

```bash
pnpm test:run src/channels/line/adapter.test.ts src/daemon/channels.test.ts src/config/schema.test.ts src/gateway/handlers/services.test.ts
pnpm typecheck
pnpm build
```