LINE Platform Skill

This skill provides specialized knowledge and workflows for developing on the LINE Platform.

Core Capabilities

1. Messaging API (Chatbots)

• Webhook Handling: Signature verification and event processing (message, follow, join, etc.).

• Sending Messages: Reply, Push, Multicast, and Broadcast messages.

• Message Types: Text, Sticker, Image, Video, Audio, Location, Flex Messages, and Templates.

• Rich Menus: Setting, getting, and switching per-user rich menus.

• User Profile: Retrieving display name and status message with user ID.

See references/messaging-api.md for detailed JSON schemas and endpoints.

2. LIFF (LINE Front-end Framework)

• SDK Integration: Using CDN or npm.

• Initialization: liff.init() and login state management.

• Interaction: Sending messages from LIFF, sharing content, and scanning QR codes.

• Context: Accessing user IDs and group IDs from the app's context.

See references/liff.md for core SDK methods.

3. LINE Login

• OAuth 2.1 Flow: Authorization request, token exchange, and token management.

• ID Tokens (JWT): Securely extracting user profiles (including email).

• Auto Login: Best practices for implementing auto login.

See references/login.md for the complete auth flow.

Common Workflows

Creating a Chatbot

• Set up a Provider and Messaging API Channel in the LINE Developers Console.

• Issue a Channel Access Token.

• Register a Webhook URL on your server.

• Implement Signature Verification (using your Channel Secret).

• Handle incoming events (e.g., type: "message" ) and respond using the Reply Token.

Developing a LIFF App

• Create a LINE Login Channel.

• Add a LIFF App to the channel and get a LIFF ID .

• Use the LIFF Starter template from assets/liff-starter/index.html to begin development.

• Call liff.init({ liffId: '...' }) as the first step in your JavaScript.

• Use liff.sendMessages() to interact with the chat or liff.getProfile() to get user info.

Reusable Resources

Scripts

• scripts/flex_builder.py : Generates a basic Flex Message bubble JSON.

Assets

• assets/liff-starter/index.html : A minimal LIFF app template.

Important Note on Security

• Channel Secret: Never expose your Channel Secret in client-side code (like LIFF). Use it only on your server for signature verification.

• Channel Access Token: Store it securely and never commit it to source control. Use Environment Variables.

• Signature Verification: Always verify the x-line-signature header in webhooks to ensure requests come from LINE.