feat(gateway): add LINE Messaging API platform plugin (#23197)

* feat(gateway): add LINE Messaging API platform plugin

Adds LINE as a bundled platform plugin under `plugins/platforms/line/`,
synthesized from the strongest pieces of seven open community PRs. The
adapter requires zero core edits — `Platform("line")` is auto-discovered
via the bundled-plugin scan in `gateway/config.py`, and all hooks
(setup, env-enablement, cron delivery, standalone send) are wired
through `register_platform()` kwargs the way IRC and Teams do it.

Highlights merged into one plugin:

- **Reply token preferred, Push fallback.** Try the free reply token
  first (single-use, ~60s TTL); fall back to metered Push when the
  token is absent, expired, or rejected. (PR #21023)
- **Slow-LLM Template Buttons postback.** When the LLM is still running
  past `LINE_SLOW_RESPONSE_THRESHOLD` (default 45s), the adapter burns
  the original reply token to send a "Get answer" button bubble. The
  user taps it to fetch the cached answer via a fresh reply token —
  also free. State machine: PENDING → READY → DELIVERED, ERROR for
  cancelled runs (orphan resolves to `LINE_INTERRUPTED_TEXT` after
  /stop). Set threshold to 0 to disable. (PR #18153)
- **Three-allowlist gating** — separate user / group / room allowlists
  with `LINE_ALLOW_ALL_USERS=true` dev-only escape hatch. (PR #18153)
- **Markdown URL preservation.** Strip bold/italic/code-fence/heading
  markers (LINE renders them literally) but keep `[label](url)` →
  `label (url)` so URLs stay tappable. (PR #18153)
- **System-message bypass** for ` Interrupting`, ` Queued`, etc. —
  busy-acks reach the user as visible bubbles instead of being
  swallowed into the postback cache. (PR #18153)
- **Media via public HTTPS URLs.** LINE doesn't accept binary uploads;
  images/audio/video must be HTTPS-reachable. The adapter serves
  registered tempfiles under `/line/media/<token>/<filename>` from the
  same aiohttp app. Allowed-roots traversal guard covers
  `tempfile.gettempdir()`, `/tmp` (→ `/private/tmp` on macOS), and
  `HERMES_HOME`. `LINE_PUBLIC_URL` overrides URL construction for
  setups behind tunnels/proxies. (PR #8398)
- **5-message-per-call batching.** LINE rejects >5 messages per
  Reply/Push; smart-chunker caps text at 4500 chars per bubble.
- **Inbound dedup** via `webhookEventId` LRU. (PR #21023)
- **Self-message filter** via `/v2/bot/info` userId lookup. (PR #21023)
- **Loading-animation indicator** wired to LINE's `chat/loading/start`
  endpoint, DM-only (LINE rejects it for groups/rooms). (PR #21023)
- **Out-of-process cron delivery** via `_standalone_send`, so
  `deliver: line` cron jobs work even when cron runs detached from
  the gateway.
- **Webhook hardening** — 1 MiB body cap, constant-time HMAC-SHA256
  signature verification, dedup, scoped lock so two profiles can't
  bind the same channel.

Validation
----------

- `scripts/run_tests.sh tests/gateway/test_line_plugin.py` →
  73 passed in 1.05s
- `scripts/run_tests.sh tests/gateway/test_line_plugin.py
  tests/gateway/test_irc_adapter.py
  tests/gateway/test_plugin_platform_interface.py
  tests/gateway/test_platform_registry.py
  tests/gateway/test_config.py` → 193 passed, 7 skipped
- E2E import + register + signature roundtrip + `Platform("line")`
  bundled-plugin discovery verified against current `origin/main`.

Closes the seven open LINE PRs (#18153, #16832, #6676, #21023, #14942,
#14988, #8398) by superseding them with a single plugin-form
implementation that takes the best idea from each.

Co-authored-by: pwlee <32443648+leepoweii@users.noreply.github.com>
Co-authored-by: Jetha Chan <jetha@google.com>
Co-authored-by: Cattia <openclaw@liyangchen.me>
Co-authored-by: perng <charles@perng.com>
Co-authored-by: Soichiro Yoshimura <soichiro0111.dev@gmail.com>
Co-authored-by: David Zhou <77736378+David-0x221Eight@users.noreply.github.com>
Co-authored-by: Yu-ga <74749461+yuga-hashimoto@users.noreply.github.com>

* docs(platforms): document platform-specific slow-LLM UX pattern

Add a 'Platform-Specific Slow-LLM UX' section to the platform-adapter
developer guide covering the _keep_typing override pattern that LINE
uses for its Template Buttons postback flow.

Three subsections:
- Pattern: subclass _keep_typing to layer mid-flight UX (with code)
- Pattern: subclass send to route through a cache instead of sending
- When this pattern is appropriate (vs. always-Push fallback)

Plus a short pointer in gateway/platforms/ADDING_A_PLATFORM.md so
tree-readers find the prose walkthrough on the docsite.

Filed because the LINE plugin (PR #23197) was the first bundled
adapter to need this pattern — every prior plugin (irc, teams,
google_chat) handles slow responses with the default typing-loop and
a regular send_text. Documenting now while the rationale is fresh.

---------

Co-authored-by: pwlee <32443648+leepoweii@users.noreply.github.com>
Co-authored-by: Jetha Chan <jetha@google.com>
Co-authored-by: Cattia <openclaw@liyangchen.me>
Co-authored-by: perng <charles@perng.com>
Co-authored-by: Soichiro Yoshimura <soichiro0111.dev@gmail.com>
Co-authored-by: David Zhou <77736378+David-0x221Eight@users.noreply.github.com>
Co-authored-by: Yu-ga <74749461+yuga-hashimoto@users.noreply.github.com>
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@ -1,12 +1,12 @@
---
sidebar_position: 1
title: "Messaging Gateway"
description: "Chat with Hermes from Telegram, Discord, Slack, WhatsApp, Signal, SMS, Email, Home Assistant, Mattermost, Matrix, DingTalk, Yuanbao, Microsoft Teams, Webhooks, or any OpenAI-compatible frontend via the API server — architecture and setup overview"
description: "Chat with Hermes from Telegram, Discord, Slack, WhatsApp, Signal, SMS, Email, Home Assistant, Mattermost, Matrix, DingTalk, Yuanbao, Microsoft Teams, LINE, Webhooks, or any OpenAI-compatible frontend via the API server — architecture and setup overview"
---
# Messaging Gateway
Chat with Hermes from Telegram, Discord, Slack, WhatsApp, Signal, SMS, Email, Home Assistant, Mattermost, Matrix, DingTalk, Feishu/Lark, WeCom, Weixin, BlueBubbles (iMessage), QQ, Yuanbao, Microsoft Teams, or your browser. The gateway is a single background process that connects to all your configured platforms, handles sessions, runs cron jobs, and delivers voice messages.
Chat with Hermes from Telegram, Discord, Slack, WhatsApp, Signal, SMS, Email, Home Assistant, Mattermost, Matrix, DingTalk, Feishu/Lark, WeCom, Weixin, BlueBubbles (iMessage), QQ, Yuanbao, Microsoft Teams, LINE, or your browser. The gateway is a single background process that connects to all your configured platforms, handles sessions, runs cron jobs, and delivers voice messages.
For the full voice feature set — including CLI microphone mode, spoken replies in messaging, and Discord voice-channel conversations — see [Voice Mode](/docs/user-guide/features/voice-mode) and [Use Voice Mode with Hermes](/docs/guides/use-voice-mode-with-hermes).
@ -34,6 +34,7 @@ For the full voice feature set — including CLI microphone mode, spoken replies
| QQ | ✅ | ✅ | ✅ | — | — | ✅ | — |
| Yuanbao | ✅ | ✅ | ✅ | — | — | ✅ | ✅ |
| Microsoft Teams | — | ✅ | — | ✅ | — | ✅ | — |
| LINE | — | ✅ | ✅ | — | — | ✅ | — |
**Voice** = TTS audio replies and/or voice message transcription. **Images** = send/receive images. **Files** = send/receive file attachments. **Threads** = threaded conversations. **Reactions** = emoji reactions on messages. **Typing** = typing indicator while processing. **Streaming** = progressive message updates via editing.