Basic NFTMarket and Atomic Swap Solidity Contracts Repository

This repository contains two Solidity smart contracts: NFTMarket and AtomicSwap. These contracts allow for decentralized trading of non-fungible tokens (NFTs) and Atomic swaps of ERC20 tokens, respectively.

NFTMarket

The NFTMarket contract is a decentralized marketplace for buying and selling NFTs. Users can list their NFTs for sale and purchase others in a secure and transparent manner.

Features

• Sell NFTs: Owners can list their NFTs at a specific price.
• Buy NFTs: Buyers can purchase listed NFTs.
• Delist NFTs: Sellers can remove their NFTs from the marketplace.
• Market Fee: A configurable market fee percentage is taken from each sale.

Usage

To interact with the contract, one can use the following primary functions:

• listNFT(address nftContract, uint256 tokenId, uint256 price)
• delistNFT(uint256 listingId)
• fulfillListing(uint256 listingId)

AtomicSwap

The AtomicSwap contract enables trustless swapping of ERC20 tokens between two parties. This contract ensures that both sides of the trade are fulfilled, or the transaction is reverted.

Features

• Initiate Swap: User A can initiate a swap with specified tokens and amounts.
• Accept Swap: User B can accept the initiated swap.
• Cancel Swap: User A can cancel the swap before it's accepted.

Usage

To initiate, accept, or cancel a swap, the following functions are available:

• initiateSwap(address userB, address tokenA, address tokenB, uint256 amountA, uint256 amountB)
• initiateSwap(address userB, address tokenA, address tokenB, uint256 amountA, uint256 amountB, bytes32 salt)
• acceptSwap(bytes32 swapId)
• cancelSwap(bytes32 swapId)

Installation

These contracts are written in Solidity and tested with Foundry framework.

Foundry install instructions

Once Foundry is installed, it is a good idea to run foundryup in connamd line:

foundryup

Clone this repo, cd into project folder and run forge install:

git clone https://github.com/sammyshakes/Eigenlayer-interview.git
cd Eigenlayer-interview
forge install

Run tests:

forge test 

To see traces:

forge test -vvvv

Notes

getUserTransactions function was added to retrieve any users past purchases and sales. However, it is my opinion this should be done with event indexing. Proper events have been provided to handle this functionality.

Contributions

Contributions, issues, and feature requests are welcome!