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

1. Set up a Provider and Messaging API Channel in the LINE Developers Console.
2. Issue a Channel Access Token.
3. Register a Webhook URL on your server.
4. Implement Signature Verification (using your Channel Secret).
5. Handle incoming events (e.g., type: "message") and respond using the Reply Token.

Developing a LIFF App

1. Create a LINE Login Channel.
2. Add a LIFF App to the channel and get a LIFF ID.
3. Use the LIFF Starter template from assets/liff-starter/index.html to begin development.
4. Call liff.init({ liffId: '...' }) as the first step in your JavaScript.
5. 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.