becrypto/contracts/market/MarketPlace.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "../core/HasSignature.sol";

// this contract will transfer ownership to BETimelockController after deployed
// all onlyowner method would add timelock
contract MarketPlace is Ownable, HasSignature {
  using SafeERC20 for IERC20;
  using SafeMath for uint256;

  // Supported payment token WETH & list of authorized ERC20
  mapping(address => bool) public paymentTokens;
  mapping(bytes => bool) public usedSignatures;

  // Address to receive transaction fee
  address public feeToAddress;
  uint256 public transactionFee;

  uint256 public constant MIN_TRANSACTION_FEE = 50;
  uint256 public constant MAX_TRANSACTION_FEE = 1000;

  // Events
  event MatchTransaction(
    uint256 indexed tokenId,
    address contractAddress,
    uint256 price,
    address paymentToken,
    address seller,
    address buyer,
    uint256 fee
  );

  constructor() HasSignature("MarketPlace", "1") {}

  function setFeeToAddress(address _feeToAddress) external onlyOwner {
    require(
      _feeToAddress != address(0),
      "fee received address can not be zero"
    );
    feeToAddress = _feeToAddress;
  }

  function setTransactionFee(uint256 _transactionFee) external onlyOwner {
    require(
      _transactionFee >= MIN_TRANSACTION_FEE &&
        _transactionFee <= MAX_TRANSACTION_FEE,
      "Marketplace: _transactionFee must >= 50 and <= 1000"
    );
    transactionFee = _transactionFee;
  }

  function setPaymentTokens(address[] calldata _paymentTokens)
    external
    onlyOwner
  {
    for (uint256 i = 0; i < _paymentTokens.length; i++) {
      if (paymentTokens[_paymentTokens[i]]) {
        continue;
      }

      paymentTokens[_paymentTokens[i]] = true;
    }
  }

  function removePaymentTokens(address[] calldata _removedPaymentTokens)
    external
    onlyOwner
  {
    for (uint256 i = 0; i < _removedPaymentTokens.length; i++) {
      paymentTokens[_removedPaymentTokens[i]] = false;
    }
  }

  function ignoreSignature(
    address[2] calldata addresses,
    uint256[3] calldata values,
    bytes calldata signature
  ) external signatureValid(signature) {
    bytes32 criteriaMessageHash = getMessageHash(
      addresses[0],
      values[0],
      addresses[1],
      values[1],
      values[2]
    );

    checkSigner(_msgSender(), criteriaMessageHash, signature);
    _useSignature(signature);
  }

  /**
   * @dev Function matched transaction with user signatures
   */
  function matchTransaction(
    address[3] calldata addresses,
    uint256[3] calldata values,
    bytes calldata signature
  ) external signatureValid(signature) returns (bool) {
    // address[3] [seller_address,nft_address,payment_token_address]
    // uint256[3] [token_id,price,salt_nonce]
    // bytes seller_signature
    require(paymentTokens[addresses[2]], "Marketplace: invalid payment method");

    bytes32 criteriaMessageHash = getMessageHash(
      addresses[1],
      values[0],
      addresses[2],
      values[1],
      values[2]
    );

    checkSigner712(addresses[0], criteriaMessageHash, signature);

    // check current ownership
    IERC721 nft = IERC721(addresses[1]);
    require(
      nft.ownerOf(values[0]) == addresses[0],
      "Marketplace: seller is not owner of this item now"
    );

    // Check payment approval and buyer balance
    IERC20 paymentContract = IERC20(addresses[2]);
    require(
      paymentContract.balanceOf(_msgSender()) >= values[1],
      "Marketplace: buyer doesn't have enough token to buy this item"
    );
    require(
      paymentContract.allowance(_msgSender(), address(this)) >= values[1],
      "Marketplace: buyer doesn't approve marketplace to spend payment amount"
    );

    // We divide by 10000 to support decimal value such as 4.25% => 425 / 10000
    uint256 fee = transactionFee.mul(values[1]).div(10000);
    uint256 payToSellerAmount = values[1].sub(fee);

    // transfer money to seller
    paymentContract.safeTransferFrom(
      _msgSender(),
      addresses[0],
      payToSellerAmount
    );

    // transfer fee to address
    if (fee > 0) {
      paymentContract.safeTransferFrom(_msgSender(), feeToAddress, fee);
    }

    // transfer item to buyer
    nft.safeTransferFrom(addresses[0], _msgSender(), values[0]);

    _useSignature(signature);
    // emit sale event
    emitEvent(addresses, values);
    return true;
  }

  /**
   * @dev Function to emit transaction matched event
   */
  function emitEvent(address[3] calldata addresses, uint256[3] calldata values)
    internal
  {
    emit MatchTransaction(
      values[0],
      addresses[1],
      values[1],
      addresses[2],
      addresses[0],
      _msgSender(),
      transactionFee
    );
  }

  function getMessageHash(
    address _nftAddress,
    uint256 _tokenId,
    address _paymentErc20,
    uint256 _price,
    uint256 _saltNonce
  ) public pure returns (bytes32) {
    return
      keccak256(
        abi.encode(
          keccak256(
            "set(address nft,uint256 tokenId,address payToken,uint256 price,uint256 salt)"
          ),
          _nftAddress,
          _tokenId,
          _paymentErc20,
          _price,
          _saltNonce
        )
      );
  }
}