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Contracts

This project is built using Foundry. For more information, visit the docs here

Disclaimer

The provided Solidity contracts are intended solely for educational purposes and are not warranted for any specific use. They have not been audited and may contain vulnerabilities, hence should not be deployed in production environments. Users are advised to seek professional review and conduct a comprehensive security audit before any real-world application to mitigate risks of financial loss or other consequences. The author(s) disclaim all liability for any damages arising from the use of these contracts. Use at your own risk, acknowledging the inherent risks of smart contract technology on the blockchain.

Contents

Introduction

BuyMeACoffee

This repository contains a sample BuyMeACoffee.sol contract which allows the user to buy the owner a coffee with 0.001 ether. Along with that the user can send the owner a memo.

CustomERC1155

It also contains a sample implementation (CustomERC1155.sol) of ERC1155 using openzeppelin's ERC1155 contract

AllowlistNFT

Contract that allows a user to mint a ERC721A either from a allowlist or from a public mint. This is useful for mints where you want to allow specified users to have early access and (optionally) a lower mint price. After your defined allowlist window ends, the public mint will begin immediately. This contract uses ERC721A as base to allow for more efficient minting of multiple NFTs in a single transaction.

It also makes use of the following utility libraries for allowlist proof verification:

  1. solady MerkleProofLib: To verify proofs when minting.
  2. murky: To easily generate merkle roots and proofs in unit tests.

Deploy Instructions: A deploy script AllowlistNFT.s.sol is provided. Please be sure to update all of the constructor arguments before deploying:

  1. name: The name of your NFT collection.
  2. ticker: The ticker of your NFT collection.
  3. allowlistRoot: The allowlist root generated for your allowlisted addresses. For information on generating merkle roots for allowlists, you can read about this in-depth guide here
  4. maxSupply: The maximum number of NFTs in your collection.
  5. price: The price of a public mint.
  6. allowlistPrice: The price of a allowlist mint.
  7. allowlistOpen: The timestamp in which allowlist mint begins.
  8. allowlistClose: The timestamp in which allowlist mint ends. Note: Public mint will begin immediately after allowlistClose.
  9. maxAllowlistMint: The maximum number of NFTs a allowlisted address can allowlist mint.
  10. maxPublicMint: The maximum number of NFTs an address can public mint.
  11. uri: The base URI of your NFT. This is your IPFS hash.

Project Layout

.
├── foundry.toml
├── script
│   └── BuyMeACoffee.s.sol
│   └── CustomERC155.s.sol
│   └── AllowlistNFT.s.sol
├── src
│   └── BuyMeACoffee.sol
│    └── CustomERC155.sol
│   └── AllowlistNFT.sol
└── test
    └── BuyMeACoffee.t.sol
    └── CustomERC155.t.sol
    └── AllowlistNFT.t.sol
  • You can configure Foundry's behavior using foundry.toml.
  • The default directory for contracts is src/.
  • The default directory for tests is test/
  • The default directory for writing scripts is script/

Usage

Installation

Install foundry using

curl -L https://foundry.paradigm.xyz | bash
foundryup

Follow the instructions of foundryup to completely setup foundry

Install dependencies

forge install

Build

forge build

Test

forge test

Coverage

You will need to install genhtml to generate html reports (brew install lcov for osx).

forge coverage --report lcov && genhtml -o report --branch-coverage lcov.info

Format

forge fmt

Deploy and verify contracts on Base Sepolia

Open .env file.

PRIVATE_KEY is your private wallet key. Make sure to prefix it by "0x" to convert to a hex string.

BLOCK_EXPLORER_API_KEY is your API Key from basescan.org for Base Sepolia

source .env

forge script script/BuyMeACoffee.s.sol:BuyMeACoffeeScript --broadcast --verify --rpc-url base_sepolia

Note: The above command will print the address of your contract and a link to the block explorer. Click on the block explorer link to verify whether your contract has been deployed or not

Deployment

Verified

Forge runs your solidity script. In that script it tries to broadcast the transaction. It writes it back into the broadcast folder in a run-latest.json file.

ABI

To extract the abi of your contract, you can go to out/BuyMeACoffee.sol/BuyMeACoffee.json and copy the value corresponding to the abi key

Deploying your own contract

  1. To deploy your own contract create a new .sol file inside the contracts/src folder, similar to BuyMeACoffee.sol

  2. Format and build your contracts using forge fmt and forge build respectively.

  3. Write some tests by creating a test file inside contracts/test folder, similar to BuyMeACoffee.t.sol. Run the test using forge test

  4. Write a deployment script inside contracts/script, similar to BuyMeACoffee.s.sol

  5. Create a .env file using the .env.example file provided in your contracts folder and add your private key. Make sure to add a 0x in front of your key to convert it to a hex string.

  6. Deploy your contract using the following commands:

    source .env

forge script script/YOUR_SCRIPT.s.sol:YOUR_SCRIPT --broadcast --rpc-url base_sepolia

    Note: To deploy on a different network, simply add the specific RPC endpoint within the [rpc_endpoints] section found in the foundry.toml file.

  7. To extract the abi of your contract, you can go to out/YOUR_CONTRACT.sol/YOUR_CONTRACT.json and copy the value corresponding to the abi key

Deploy to local node

Initially, building on a local node can offer numerous benefits, including:

  • The ability to add debug statements.
  • The capability to fork a chain at a particular block, enabling the detection of reasons behind specific behaviors.
  • The absence of the need for testnet/mainnet funds.
  • Faster testing, as only your node is responsible for consensus.

You can deploy your contracts to local node for faster testing as follows:

make local-node

anvil

To deploy the contract:

  • Make sure to delete the following lines from foundry.toml because locally we dont have a block explorer

    [etherscan]
"${NETWORK}"={key="${BLOCK_EXPLORER_API_KEY}"}

  • Create a .env file using the .env.example file provided in your contracts folder and add one the private keys printed on your terminal when you ran make local-node. Also update the RPC_URL to http://127.0.0.1:8545, this will make sure your contracts are deployed locally

  • Deploy the sample contract using:

    source .env
forge script script/LocalContract.s.sol:LocalContractScript  --broadcast --rpc-url ${RPC_URL}

local-deployment

You can observe that the console2 library facilitates the addition of console logs in the contract, which would not have been possible if you were deploying to a testnet or mainnet.

Contributing

If you would like to contribute to contracts folder, follow the given steps for setup

Installation

Install foundry using

curl -L https://foundry.paradigm.xyz | bash
foundryup

Follow the instructions of foundryup to completely setup foundry

Install dependencies

Run the following commands inside the contracts folder:

forge install
forge build

You should be good to go :) Thank you for the support ❤️