@bananapus/721-hook

Bananapus NFT Hook

nana-721-hook is:

1. A pay hook for Juicebox projects to sell tiered NFTs (ERC-721s) with different prices and artwork.
2. (Optionally) a redeem hook which allows holders to burn their NFTs to reclaim funds from the project, in proportion to the NFT's price.

Table of Contents

1. Usage
• Install
• Develop
• Scripts
• Deployments
• With Sphinx
• Without Sphinx
• Tips
2. Repository Layout
3. Architecture
• Contracts
4. Description
• Hooks
• Mechanism
• Setup

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-721-hook in another project.

For projects using npm to manage dependencies (recommended):

npm install @bananapus/721-hook

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

forge install Bananapus/nana-721-hook

If you're using forge to manage dependencies, add @bananapus/721-hook/=lib/nana-721-hook/ to remappings.txt. You'll also need to install nana-721-hook's dependencies and add similar remappings for them.

Develop

nana-721-hook 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 coverage	Generate an LCOV test coverage report.
npm run artifacts	Fetch Sphinx artifacts and write them to deployments/

Deployments

With Sphinx

nana-721-hook manages deployments with Sphinx. To run the deployment scripts, install the npm devDependencies with:

`npm ci --also=dev`

You'll also need to set up a .env file based on .example.env. Then run one of the following commands:

Command	Description
npm run deploy:mainnets	Propose mainnet deployments.
npm run deploy:testnets	Propose testnet deployments.

Your teammates can review and approve the proposed deployments in the Sphinx UI. Once approved, the deployments will be executed.

Without Sphinx

You can use the Sphinx CLI to run the deployment scripts without paying for Sphinx. First, install the npm devDependencies with:

`npm ci --also=dev`

You can deploy the contracts like so:

PRIVATE_KEY="0x123..." RPC_ETHEREUM_SEPOLIA="https://rpc.ankr.com/eth_sepolia" npx sphinx deploy script/Deploy.s.sol --network ethereum_sepolia

This example deploys nana-721-hook to the Sepolia testnet using the specified private key. You can configure new networks in foundry.toml.

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-721-hook/
├── script/
│   ├── Deploy.s.sol - Deploys core contracts - the hook store, deployer, and project deployer.
│   ├── LaunchProjectFor.s.sol - (DEPRECATED) Deploys a project with a 721 tiers hook.
│   └── helpers/
│       └── Hook721DeploymentLib.sol - Internal helpers for deployment scripts.
├── src/ - Contract source code. Top level contains implementation contracts.
│   ├── JB721TiersHook.sol - The core tiered NFT pay/redeem hook.
│   ├── JB721TiersHookDeployer.sol - Deploys an NFT hook for a project.
│   ├── JB721TiersHookProjectDeployer.sol - Deploys a project with a tiered NFT hook.
│   ├── JB721TiersHookStore.sol - Stores and manages data for tiered NFT hooks.
│   ├── abstract/
│   │   ├── ERC721.sol - Abstract ERC-721 implementation.
│   │   └── JB721Hook.sol - Abstract NFT hook implementation.
│   ├── interfaces/ - Contract interfaces.
│   ├── libraries/ - Libraries.
│   └── structs/ - Structs.
└── test/ - Forge tests and testing utilities.
    ├── E2E/
    │   └── Pay_Mint_Redeem_E2E.t.sol - End-to-end test for minting and redeeming NFTs.
    ├── unit/ - Unit tests for various components..
    └── utils/ - Miscellaneous testing utilities.

Other directories:

nana-721-hook/
├── .github/
│   └── workflows/ - CI/CD workflows.
└── deployments/ - Sphinx deployment logs.

Architecture

graph TD;
    A[JB721TiersHookProjectDeployer] -->|Launches & queues rulesets for| B[Juicebox projects]
    D[JB721TiersHookDeployer] -->|Adds NFT hooks to| B
    A -->|Deploys| C[JB721TiersHook]
    D -->|Deploys| C
    B -->|Calls upon pay/redeem| C
    C -->|Stores data in| E[JB721TiersHookStore]
    B -->|Uses| F[Pay/redeem terminal]
    C -->|Mints NFTs upon payment through| F
    C -->|Burns NFTs to reclaim funds through| F

Contracts

Contract	Description
JB721TiersHook.sol	The core tiered NFT pay/redeem hook implementation.
JB721TiersHookDeployer.sol	Exposes a deployHookFor(…) function which allows deploys an NFT hook for a project.
JB721TiersHookProjectDeployer.sol	Exposes a launchProjectFor(…) function which deploys a project with a tiered NFT hook already set up.
JB721TiersHookStore.sol	Stores and manages data for tiered NFT hooks.

Description

Hooks

This contract is a data hook, a pay hook, and a redeem hook. Data hooks receive information about a payment or a redemption, and put together a payload for the pay/redeem hook to execute.

Juicebox projects can specify a data hook in their JBRulesetMetadata. When someone attempts to pay or redeem from the project, the project's terminal records the payment in the terminal store, passing information about the payment/redemption to the data hook in the process. The data hook responds with a list of payloads – each payload specifies the address of a pay/redeem hook, as well as some custom data and an amount of funds to send to that pay/redeem hook.

Each pay/redeem hook can then execute custom behavior based on the custom data (and funds) they receive.

Mechanism

A project using a 721 tiers hook can specify any number of NFT tiers.

• NFT tiers can be removed by the project owner as long as they are not locked.
• NFT tiers can be added by the project owner as long as they respect the hook's flags. The flags specify if newly added tiers can have votes (voting units), if new tiers can have non-zero reserve frequencies, if new tiers can allow on-demand minting by the project's owner, and if the tier can be removed.

Each tier has the following optional properties:

• A price.
• A supply (the maximum number of NFTs which can be minted from the tier).
• A token URI (artwork and metadata), which can be overridden by a URI resolver. The URI resolver can return unique values for each NFT in the tier.
• A category, so tiers can be organized and accessed for different purposes.
• A reserve frequency (optional). With a reserve frequency of 5, an extra NFT will be minted to a pre-specified beneficiary address for every 5 NFTs purchased and minted from the tier.
• A number of votes each NFT should represent on-chain (optional).
• A flag to specify whether the NFTs in the tier can always be transferred, or if transfers can be paused depending on the project's ruleset.
• A flag to specify whether the contract's owner can mint NFTs from the tier on-demand.
• A set of flags which restrict tiers added in the future (the votes/reserved frequency/on-demand minting/can be removed flags noted above).

Additional notes:

• A payer can specify any number of tiers to mint as long as the total price does not exceed the amount being paid. If tiers aren't specified, their payment mints the most expensive tier possible, unless they specify that the hook should not mint any NFTs.
• If the payment and a tier's price are specified in different currencies, the JBPrices contract is used to normalize the values.
• If some of a payment does not go towards purchasing an NFT, those extra funds will be stored as "NFT credits" which can be used for future purchases. Optionally, the hook can disallow credits and reject payments with leftover funds.
• If enabled by the project owner, holders can burn their NFTs to reclaim funds from the project. These redemptions are proportional to the NFTs price, relative to the combined price of all the NFTs.
• NFT redemptions can be enabled by setting useDataHookForRedeem to true in the project's JBRulesetMetadata. If NFT redemptions are enabled, project token redemptions are disabled.
• The hook's deployer can choose if the NFTs should support on-chain voting (as ERC721Votes). This increases the gas fees to interact with the NFTs, and should be disabled if not needed.

Setup

To use a 721 tiers hook, a Juicebox project should be created by a JB721TiersHookProjectDeployer instead of a JBController. The deployer will create a JB721TiersHook (through an associated JB721TiersHookDeployer) and add it to the project's first ruleset. New rulesets can be queued with JB721TiersHookProjectDeployer.queueRulesetsOf(…) if the project's owner gives the project deployer the permission JBPermissions.QUEUE_RULESETS (ID 2) in JBPermissions.

It's also possible to add a 721 tiers hook to an existing project by calling JB721TiersHookDeployer.deployHookFor(…) and adding the hook to the project's ruleset – specifically, the project must set their JBRulesetMetadata.dataHook to the newly deployed hook, and enable JBRulesetMetadata.useDataHookForPay and/or JBRulesetMetadata.useDataHookForRedeem depending on the functionality they'd like to enable.

All JB721TiersHooks store their data in the JB721TiersHookStore contract.