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Casys Docs

LINE Adapter

Overview

Section titled “Overview”

The LINE LIFF adapter enables MCP Apps to run inside LINE’s in-app browser framework.

Setup

Section titled “Setup”
import { LineAdapter } from "@casys/mcp-bridge";


// Client-side: runs inside the LINE LIFF WebView
const adapter = new LineAdapter();
await adapter.init({ resourceBaseUrl: "https://your-domain.com" });

Features

Section titled “Features”
  • OAuth Token Handling: Automatic token management via LIFF SDK
  • Platform Detection: Detects mobile vs web browser environments
  • Locale Mapping: Maps LINE’s locale to MCP context
  • External Links: Opens links via liff.openWindow()
  • Safe Area: Reports viewport dimensions for proper UI rendering

Authentication

Section titled “Authentication”

LINE authentication uses OAuth 2.0 tokens:

  1. User opens the LIFF app in LINE
  2. LIFF SDK handles the OAuth flow
  3. The adapter extracts the access token
  4. Token is validated server-side against LINE’s API