Docs: add LINE channel guide

docs/channels/index.md

@@ -21,6 +21,7 @@ Text is supported everywhere; media and reactions vary by channel.
 - [BlueBubbles](/channels/bluebubbles) — **Recommended for iMessage**; uses the BlueBubbles macOS server REST API with full feature support (edit, unsend, effects, reactions, group management — edit currently broken on macOS 26 Tahoe).
 - [iMessage](/channels/imessage) — macOS only; native integration via imsg (legacy, consider BlueBubbles for new setups).
 - [Microsoft Teams](/channels/msteams) — Bot Framework; enterprise support (plugin, installed separately).
+- [LINE](/channels/line) — LINE Messaging API bot (plugin, installed separately).
 - [Nextcloud Talk](/channels/nextcloud-talk) — Self-hosted chat via Nextcloud Talk (plugin, installed separately).
 - [Matrix](/channels/matrix) — Matrix protocol (plugin, installed separately).
 - [Nostr](/channels/nostr) — Decentralized DMs via NIP-04 (plugin, installed separately).

docs/channels/line.md

@@ -0,0 +1,183 @@
+---
+summary: "LINE Messaging API plugin setup, config, and usage"
+read_when:
+  - You want to connect Clawdbot to LINE
+  - You need LINE webhook + credential setup
+  - You want LINE-specific message options
+---
+
+# LINE (plugin)
+
+LINE connects to Clawdbot via the LINE Messaging API. The plugin runs as a webhook
+receiver on the gateway and uses your channel access token + channel secret for
+authentication.
+
+Status: supported via plugin. Direct messages, group chats, media, locations, Flex
+messages, template messages, and quick replies are supported. Reactions and threads
+are not supported.
+
+## Plugin required
+
+Install the LINE plugin:
+
+```bash
+clawdbot plugins install @clawdbot/line
+```
+
+Local checkout (when running from a git repo):
+
+```bash
+clawdbot plugins install ./extensions/line
+```
+
+## Setup
+
+1) Create a LINE Developers account and open the Console:
+   https://developers.line.biz/console/
+2) Create (or pick) a Provider and add a **Messaging API** channel.
+3) Copy the **Channel access token** and **Channel secret** from the channel settings.
+4) Enable **Use webhook** in the Messaging API settings.
+5) Set the webhook URL to your gateway endpoint (HTTPS required):
+
+```
+https://gateway-host/line/webhook
+```
+
+The gateway responds to LINE’s webhook verification (GET) and inbound events (POST).
+If you need a custom path, set `channels.line.webhookPath` or
+`channels.line.accounts.<id>.webhookPath` and update the URL accordingly.
+
+## Configure
+
+Minimal config:
+
+```json5
+{
+  channels: {
+    line: {
+      enabled: true,
+      channelAccessToken: "LINE_CHANNEL_ACCESS_TOKEN",
+      channelSecret: "LINE_CHANNEL_SECRET",
+      dmPolicy: "pairing"
+    }
+  }
+}
+```
+
+Env vars (default account only):
+
+- `LINE_CHANNEL_ACCESS_TOKEN`
+- `LINE_CHANNEL_SECRET`
+
+Token/secret files:
+
+```json5
+{
+  channels: {
+    line: {
+      tokenFile: "/path/to/line-token.txt",
+      secretFile: "/path/to/line-secret.txt"
+    }
+  }
+}
+```
+
+Multiple accounts:
+
+```json5
+{
+  channels: {
+    line: {
+      accounts: {
+        marketing: {
+          channelAccessToken: "...",
+          channelSecret: "...",
+          webhookPath: "/line/marketing"
+        }
+      }
+    }
+  }
+}
+```
+
+## Access control
+
+Direct messages default to pairing. Unknown senders get a pairing code and their
+messages are ignored until approved.
+
+```bash
+clawdbot pairing list line
+clawdbot pairing approve line <CODE>
+```
+
+Allowlists and policies:
+
+- `channels.line.dmPolicy`: `pairing | allowlist | open | disabled`
+- `channels.line.allowFrom`: allowlisted LINE user IDs for DMs
+- `channels.line.groupPolicy`: `allowlist | open | disabled`
+- `channels.line.groupAllowFrom`: allowlisted LINE user IDs for groups
+- Per-group overrides: `channels.line.groups.<groupId>.allowFrom`
+
+LINE IDs are case-sensitive. Valid IDs look like:
+
+- User: `U` + 32 hex chars
+- Group: `C` + 32 hex chars
+- Room: `R` + 32 hex chars
+
+## Message behavior
+
+- Text is chunked at 5000 characters.
+- Markdown formatting is stripped; code blocks and tables are converted into Flex
+  cards when possible.
+- Streaming responses are buffered; LINE receives full chunks with a loading
+  animation while the agent works.
+- Media downloads are capped by `channels.line.mediaMaxMb` (default 10).
+
+## Channel data (rich messages)
+
+Use `channelData.line` to send quick replies, locations, Flex cards, or template
+messages.
+
+```json5
+{
+  text: "Here you go",
+  channelData: {
+    line: {
+      quickReplies: ["Status", "Help"],
+      location: {
+        title: "Office",
+        address: "123 Main St",
+        latitude: 35.681236,
+        longitude: 139.767125
+      },
+      flexMessage: {
+        altText: "Status card",
+        contents: { /* Flex payload */ }
+      },
+      templateMessage: {
+        type: "confirm",
+        text: "Proceed?",
+        confirmLabel: "Yes",
+        confirmData: "yes",
+        cancelLabel: "No",
+        cancelData: "no"
+      }
+    }
+  }
+}
+```
+
+The LINE plugin also ships a `/card` command for Flex message presets:
+
+```
+/card info "Welcome" "Thanks for joining!"
+```
+
+## Troubleshooting
+
+- **Webhook verification fails:** ensure the webhook URL is HTTPS and the
+  `channelSecret` matches the LINE console.
+- **No inbound events:** confirm the webhook path matches `channels.line.webhookPath`
+  and that the gateway is reachable from LINE.
+- **Media download errors:** raise `channels.line.mediaMaxMb` if media exceeds the
+  default limit.

docs/docs.json

@@ -117,6 +117,14 @@
       "source": "/mattermost/",
       "destination": "/channels/mattermost"
     },
+    {
+      "source": "/line",
+      "destination": "/channels/line"
+    },
+    {
+      "source": "/line/",
+      "destination": "/channels/line"
+    },
     {
       "source": "/glm",
       "destination": "/providers/glm"
@@ -197,6 +205,14 @@
       "source": "/providers/msteams/",
       "destination": "/channels/msteams"
     },
+    {
+      "source": "/providers/line",
+      "destination": "/channels/line"
+    },
+    {
+      "source": "/providers/line/",
+      "destination": "/channels/line"
+    },
     {
       "source": "/providers/signal",
       "destination": "/channels/signal"
@@ -974,6 +990,7 @@
           "channels/signal",
           "channels/imessage",
           "channels/msteams",
+          "channels/line",
           "channels/matrix",
           "channels/zalo",
           "channels/zalouser",