Bananapus Project Handles

Juicebox projects can use an ENS address as their project's "handle" in frontend clients like juicebox.money. To make this association, they must set their juicebox_project ENS name's text record to their project's ID. The JBProjectHandles contract manages reverse records that point from project IDs to ENS names. If the two records match, that ENS name is considered the project's handle, and is shown in frontend clients.

Table of Contents

1. Usage
• Install
• Develop
• Scripts
• Deployments
• Tips
2. Repository Layout
3. Description
• Motivation
• Reading Handles
• Text Record and Multichain
4. Example Usage

If you're having trouble understanding this contract, take a look at the core protocol contracts and the documentation first. If you have questions, reach out on Discord.

Usage

Install

How to install nana-project-handles in another project.

For projects using npm to manage dependencies (recommended):

npm install @bananapus/project-handles

For projects using forge to manage dependencies (not recommended):

forge install Bananapus/nana-project-handles

If you're using forge to manage dependencies, add @bananapus/project-handles/=lib/nana-project-handles/ to remappings.txt. You'll also need to install nana-project-handles' dependencies and add similar remappings for them.

Develop

nana-project-handles uses npm (version >=20.0.0) for package management and the Foundry development toolchain for builds, tests, and deployments. To get set up, install Node.js and install Foundry:

curl -L https://foundry.paradigm.xyz | sh

You can download and install dependencies with:

npm ci && forge install

If you run into trouble with forge install, try using git submodule update --init --recursive to ensure that nested submodules have been properly initialized.

Some useful commands:

Command	Description
forge build	Compile the contracts and write artifacts to out.
forge fmt	Lint.
forge test	Run the tests.
forge build --sizes	Get contract sizes.
forge coverage	Generate a test coverage report.
foundryup	Update foundry. Run this periodically.
forge clean	Remove the build artifacts and cache directories.

To learn more, visit the Foundry Book docs.

Scripts

For convenience, several utility commands are available in package.json.

Command	Description
npm test	Run local tests.
npm run test:fork	Run fork tests (for use in CI).
npm run coverage	Generate an LCOV test coverage report.

Deployments

To deploy, you'll need to set up a .env file based on .example.env. Then run one of the following commands:

Command	Description
npm run deploy:ethereum-mainnet	Deploy to Ethereum mainnet
npm run deploy:ethereum-sepolia	Deploy to Ethereum Sepolia testnet
npm run deploy:optimism-mainnet	Deploy to Optimism mainnet
npm run deploy:optimism-sepolia	Deploy to Optimism testnet

Tips

To view test coverage, run npm run coverage to generate an LCOV test report. You can use an extension like Coverage Gutters to view coverage in your editor.

If you're using Nomic Foundation's Solidity extension in VSCode, you may run into LSP errors because the extension cannot find dependencies outside of lib. You can often fix this by running:

forge remappings >> remappings.txt

This makes the extension aware of default remappings.

Repository Layout

The root directory contains this README, an MIT license, and config files.

The important source directories are:

nana-project-handles/
├── script/
│   └── Deploy.sol - The deployment script.
├── src/
│   ├── JBProjectHandles.sol - The main JBProjectHandles contract.
│   └── interfaces/
│       └── IJBProjectHandles.sol - The project handles interface.
└── test/
    └── JBProjectHandles.t.sol - Unit tests.

Other directories:

nana-project-handles/
├── .github/
│   └── workflows/ - CI/CD workflows.
└── broadcast/ - Deployment logs.

Description

Motivation

Handles are easier to remember than IDs, but leaving this to clients could get messy. ENS names are often used as handles in the Ethereum ecosystem, because they can have text records – arbitrary key-value text pairs which can be accessed onchain. If Juicebox frontend clients were to trust ENS text records alone as a source of truth, anyone could associate their ENS handle with any Juicebox project, and could use this to mislead others. Therefore, we need a two-way association between Juicebox projects and ENS names. The JBProjectHandles contract is the "reverse record" – it allows a Juicebox project's owner to associate their project with an ENS name. If an ENS name has a text record pointing to a Juicebox project, and the project points to that ENS name through the JBProjectHandles contract, the ENS name is the project's handle.

Reading Handles

Clients can use JBProjectHandles.handleOf(…) to check a project's handle. The function only returns the handle if it is verified, and returns an empty string otherwise.

JBProjectHandles is only deployed on Ethereum mainnet, but it manages handles for Juicebox projects on all EVM-compatible networks.

Text Record and Multichain

The canonical ENS registry and the JBProjectHandles contract are only available on Ethereum mainnet, but Juicebox projects can be deployed on several EVM-compatible networks. To allow project owners to set their handles on multiple chains, the text record specifies both the chain ID and the project ID.

To point an ENS name at a Juicebox project, use the name's juicebox text record, with the format chainId:projectId. For example, to point jeff.eth to project ID #5 on Optimism mainnet (which has chain ID 10), jeff.eth must have its juicebox text record set to 10:5.

To point a Juicebox project at an ENS name, the project's owner must call JBProjectHandles.setEnsNamePartsFor(...):

/// @notice Point from a Juicebox project to an ENS node.
/// @dev The `parts` ["jbx", "dao", "foo"] represents foo.dao.jbx.eth.
/// @dev The project's owner must call this function to set its ENS name parts.
/// @param chainId The chain ID of the network the project is on.
/// @param projectId The ID of the project to set an ENS handle for.
/// @param parts The parts of the ENS domain to use as the project handle, excluding the trailing .eth.
function setEnsNamePartsFor(uint256 chainId, uint256 projectId, string[] memory parts) external override { … }

To point project #5 on Optimism mainnet back at his ENS, Jeff would have to call JBProjectHandles.setEnsNamePartsFor(10, 5, ["jeff"]). The same address which owns the project on Optimism must call setEnsNamePartsFor(…) on mainnet. If the project's owner changes, the new owner must call setEnsNamePartsFor(…) again.

Example Usage

1. jeff.eth deploys project ID #5 on Optimism mainnet. He wants to set its handle as project.jeff.eth.
2. To point his ENS at his Juicebox project, he calls PublicResolver.setText(…) on the ENS website. He sets the juicebox text record for project.jeff.eth to 10:5.
3. To point his project at his ENS, he calls setEnsNamePartsFor(…):

JBProjectHandles.setEnsNamePartsFor({
  chainId: 10, // Optimism mainnet
  projectId: 5,
  parts: ["project", "jeff"]
});

Now, frontend clients will associate his project with project.jeff.eth. To read the handle, a client can call handleOf(…):

JBProjectHandles.handleOf({
  chainId: 10,
  projectId: 5,
  projectOwner: 0x123… // jeff.eth
});

This will return project.jeff.eth if the handle is verified, and an empty string otherwise.