ChannelKit

ChannelKit is an open-source Next.js application built with Frog.js and deployed on Vercel, providing a customizable Farcaster Frame for managing channel memberships. Designed for developers, it offers a flexible foundation for creating and managing membership requests to Farcaster channels.

Prerequisites

• Node.js (v22 or later)
• Yarn package manager
• Farcaster account
• Neynar API key
• Vercel account
• Vercel CLI

How it works

1. Channel owner deploys this project to Vercel
2. Channel owner casts frame in channel, optionally pins for better visibility
3. Prespective member clicks "Request Membership" button on frame
4. Verifications run in background, and automatically output an accepted / denied state - If accepted, user is automatically sent an invite - If denied message is shown with reasoning

Getting Started

1. Clone or Fork the repository

• If you want to use the provided verification modules as-is:

  git clone https://github.com/yourusername/channel-kit.git
  cd channel-kit

• If you want to add modules, customize extensively, or contribute to the codebase:
  1. Fork the repository on GitHub using this button:
  2. Clone your forked repository:

     git clone https://github.com/your-username/channel-kit.git
     cd channel-kit

2. Install dependencies

yarn install

3. Configure environment variables

Copy the .env.example file to .env.local and fill in the required values:

cp .env.example .env.local

Edit .env.local and provide values for:

CHANNEL_ID=your_channel_id
NEYNAR_API_KEY=your_neynar_api_key

If you already have the UUID of a Neynar managed signer, you can add it to the .env.local file:

SIGNER_UUID=your_signer_uuid

If you do not have a signer UUID, see Creating a Neynar Managed Signer

4. Run the development server

yarn dev

The application will be available at http://localhost:3000/api/dev.

Deploying to Vercel

When ready, we can deploy our application:

yarn run deploy

Add our environment variables and redeploy:

yarn run upload-env

Your project should now be live!

Viewing your Frame

Let's first grab the URL of our Frame from the Vercel Dashboard:

Alternatively, you can run this command and get the first alias:

yarn vercel inspect [deployment-url]

Now we can head to the Warpcast frame validator and paste the URL to see our live Frame:

https://warpcast.com/~/developers/frames

Verifications

ChannelKit comes with a set of basic verifications to determine user eligibility for channel membership. These verifications are modular and can be easily customized or extended.

Included Verifications

• isPowerUser: Checks if the user has a power badge on Warpcast.(commented out by default)
• hasVerifiedEthAddress: Verifies if the user has a verified Ethereum address.
• hasVerifiedSolAddress: Verifies if the user has a verified Solana address.(commented out by default)
• hasMoreThan100Followers: Checks if the user has more than 100 followers.
• hasCastedMoreThan10Times: Verifies if the user has cast more than 10 times in the channel (commented out by default).
• hasProfileRankBelow200: Checks if the user's OpenRank profile rank is below 200 (commented out by default).
• isSubscribedWithSTP: Verifies if the user is subscribed with STP (Subscription Token Protocol) (commented out by default).

Adding Custom Verifications

Developers are encouraged to add their own custom verifications based on their specific requirements

Example of a custom verification:

export const hasSpecificBadge: VerificationFunction = async (
  fid: number
): Promise<VerificationResult> => {
  // Implement your verification logic here
  return { success: true, message: "User has the specific badge" }
}

Then add it to the verificationFunctions array:

const verificationFunctions: VerificationFunction[] = [
  // ... existing verifications
  hasSpecificBadge,
]

Customization

• Modify the verification criteria in verifications/index.ts
• Adjust the UI components in the ui/ directory
• Update the Frame logic in app/api/[[...routes]]/route.tsx

UI

This project uses a combination of custom styles and FrogUI. Due to some idiosyncrasies (such as custom fonts) with Frog.js, Hono, and NextJS, you might find that either custom styles or FrogUI works where the other doesn't. All custom styles can be found in ui/styles.ts, and all FrogUI elements can be found in ui/index.ts

Contributing

ChannelKit is intended to be a community project! Contributions are welcome following these steps:

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

License

This project is licensed under the MIT License.

Appendix

Creating a Neynar Managed Signer

If you do not have a signer UUID, you can create one by adding your Farcaster mnemonic to the .env.local file. Whether you use your personal mnemonic or create a new account specifically for this purpose is up to you

FARCASTER_MNEMONIC=your_farcaster_mnemonic

Then, run the following command and follow the prompts to approve the signer in the Warpcast mobile app:

yarn run create-signer

This will create a new signer and output the UUID to the .env.local file, as well as the console. It is recommended to save this UUID in case the signer is not approved, or to re-use the same signer for multiple channels.

Understanding the Verification and Data Structure

1. Data Fetching (data/farcaster.ts):

   • This file contains functions for fetching data from the Farcaster API via Neynar.
   • It includes methods like getChannelMembers(), getUser(), and getUserCasts().
   • These functions handle the raw API calls and return structured data.

2. Verification Logic (verifications/farcaster.ts):

   • This file contains the actual verification functions that use the data fetched from data/farcaster.ts.
   • Each verification function implements a specific check, such as isPowerUser or hasMoreThan100Followers.
   • These functions use the VerificationFunction type and return a VerificationResult.

This separation allows you to:

• Add new API calls in data/farcaster.ts without changing the verification logic.
• Create new verification functions in verifications/farcaster/index.ts that use existing or new data fetching methods.
• Easily extend the system with new data sources or verification providers by adding new files in the data/ and verifications/ directories.

When customizing:

1. If you need new data either from an API or onchain, add a function to data/farcaster.ts.
2. To create a new verification, add a function to verifications/farcaster/index.ts and use the data fetching functions as needed.
3. Add your new verification function to the verificationFunctions array in verifications/index.ts to include it in the verification process.

This modular approach allows you to easily extend and modify the verification system to suit your specific channel membership criteria.