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BaseExchange.sol
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BaseExchange.sol
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.3;
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../interfaces/IBaseExchange.sol";
import "../interfaces/ITokenFactory.sol";
import "../interfaces/IStrategy.sol";
import "../interfaces/IDividendPayingERC20.sol";
import "./ReentrancyGuardInitializable.sol";
import "../libraries/Signature.sol";
import "../interfaces/IERC2981.sol";
abstract contract BaseExchange is ReentrancyGuardInitializable, IBaseExchange {
using SafeERC20 for IERC20;
using Orders for Orders.Ask;
using Orders for Orders.Bid;
struct BestBid {
address bidder;
uint256 amount;
uint256 price;
address recipient;
address referrer;
uint256 timestamp;
}
mapping(address => mapping(bytes32 => mapping(address => bytes32))) internal _bidHashes;
mapping(bytes32 => BestBid) public override bestBid;
mapping(bytes32 => bool) public override isCancelledOrClaimed;
mapping(bytes32 => uint256) public override amountFilled;
function __BaseNFTExchange_init() internal initializer {
__ReentrancyGuard_init();
}
function DOMAIN_SEPARATOR() public view virtual override returns (bytes32);
function factory() public view virtual override returns (address);
function canTrade(address token) public view virtual override returns (bool) {
return token == address(this);
}
function approvedBidHash(
address proxy,
bytes32 askHash,
address bidder
) external view override returns (bytes32 bidHash) {
return _bidHashes[proxy][askHash][bidder];
}
function _transfer(
address token,
address from,
address to,
uint256 tokenId,
uint256 amount
) internal virtual;
function cancel(Orders.Ask memory order) external override {
require(order.signer == msg.sender || order.proxy == msg.sender, "SHOYU: FORBIDDEN");
bytes32 hash = order.hash();
require(bestBid[hash].bidder == address(0), "SHOYU: BID_EXISTS");
isCancelledOrClaimed[hash] = true;
emit Cancel(hash);
}
function updateApprovedBidHash(
bytes32 askHash,
address bidder,
bytes32 bidHash
) external override {
_bidHashes[msg.sender][askHash][bidder] = bidHash;
emit UpdateApprovedBidHash(msg.sender, askHash, bidder, bidHash);
}
function bid(Orders.Ask memory askOrder, Orders.Bid memory bidOrder)
external
override
nonReentrant
returns (bool executed)
{
bytes32 askHash = askOrder.hash();
require(askHash == bidOrder.askHash, "SHOYU: UNMATCHED_HASH");
require(bidOrder.signer != address(0), "SHOYU: INVALID_SIGNER");
bytes32 bidHash = bidOrder.hash();
if (askOrder.proxy != address(0)) {
require(
askOrder.proxy == msg.sender || _bidHashes[askOrder.proxy][askHash][bidOrder.signer] == bidHash,
"SHOYU: FORBIDDEN"
);
delete _bidHashes[askOrder.proxy][askHash][bidOrder.signer];
emit UpdateApprovedBidHash(askOrder.proxy, askHash, bidOrder.signer, bytes32(0));
}
Signature.verify(bidHash, bidOrder.signer, bidOrder.v, bidOrder.r, bidOrder.s, DOMAIN_SEPARATOR());
return
_bid(
askOrder,
askHash,
bidOrder.signer,
bidOrder.amount,
bidOrder.price,
bidOrder.recipient,
bidOrder.referrer
);
}
function bid(
Orders.Ask memory askOrder,
uint256 bidAmount,
uint256 bidPrice,
address bidRecipient,
address bidReferrer
) external override nonReentrant returns (bool executed) {
require(askOrder.proxy == address(0), "SHOYU: FORBIDDEN");
return _bid(askOrder, askOrder.hash(), msg.sender, bidAmount, bidPrice, bidRecipient, bidReferrer);
}
function _bid(
Orders.Ask memory askOrder,
bytes32 askHash,
address bidder,
uint256 bidAmount,
uint256 bidPrice,
address bidRecipient,
address bidReferrer
) internal returns (bool executed) {
require(canTrade(askOrder.token), "SHOYU: INVALID_EXCHANGE");
require(bidAmount > 0, "SHOYU: INVALID_AMOUNT");
uint256 _amountFilled = amountFilled[askHash];
require(_amountFilled + bidAmount <= askOrder.amount, "SHOYU: SOLD_OUT");
_validate(askOrder, askHash);
Signature.verify(askHash, askOrder.signer, askOrder.v, askOrder.r, askOrder.s, DOMAIN_SEPARATOR());
BestBid storage best = bestBid[askHash];
if (
IStrategy(askOrder.strategy).canClaim(
askOrder.proxy,
askOrder.deadline,
askOrder.params,
bidder,
bidPrice,
best.bidder,
best.price,
best.timestamp
)
) {
amountFilled[askHash] = _amountFilled + bidAmount;
if (_amountFilled + bidAmount == askOrder.amount) isCancelledOrClaimed[askHash] = true;
address recipient = askOrder.recipient;
if (recipient == address(0)) recipient = askOrder.signer;
require(
_transferFeesAndFunds(
askOrder.token,
askOrder.tokenId,
askOrder.currency,
bidder,
recipient,
bidPrice * bidAmount
),
"SHOYU: FAILED_TO_TRANSFER_FUNDS"
);
if (bidRecipient == address(0)) bidRecipient = bidder;
_transfer(askOrder.token, askOrder.signer, bidRecipient, askOrder.tokenId, bidAmount);
emit Claim(askHash, bidder, bidAmount, bidPrice, bidRecipient, bidReferrer);
return true;
} else {
if (
IStrategy(askOrder.strategy).canBid(
askOrder.proxy,
askOrder.deadline,
askOrder.params,
bidder,
bidPrice,
best.bidder,
best.price,
best.timestamp
)
) {
best.bidder = bidder;
best.amount = bidAmount;
best.price = bidPrice;
best.recipient = bidRecipient;
best.referrer = bidReferrer;
best.timestamp = block.timestamp;
emit Bid(askHash, bidder, bidAmount, bidPrice, bidRecipient, bidReferrer);
return false;
}
}
revert("SHOYU: FAILURE");
}
function claim(Orders.Ask memory askOrder) external override nonReentrant {
require(canTrade(askOrder.token), "SHOYU: INVALID_EXCHANGE");
bytes32 askHash = askOrder.hash();
_validate(askOrder, askHash);
Signature.verify(askHash, askOrder.signer, askOrder.v, askOrder.r, askOrder.s, DOMAIN_SEPARATOR());
BestBid memory best = bestBid[askHash];
require(
IStrategy(askOrder.strategy).canClaim(
askOrder.proxy,
askOrder.deadline,
askOrder.params,
best.bidder,
best.price,
best.bidder,
best.price,
best.timestamp
),
"SHOYU: FAILURE"
);
address recipient = askOrder.recipient;
if (recipient == address(0)) recipient = askOrder.signer;
isCancelledOrClaimed[askHash] = true;
require(
_transferFeesAndFunds(
askOrder.token,
askOrder.tokenId,
askOrder.currency,
best.bidder,
recipient,
best.price * best.amount
),
"SHOYU: FAILED_TO_TRANSFER_FUNDS"
);
amountFilled[askHash] = amountFilled[askHash] + best.amount;
address bidRecipient = best.recipient;
if (bidRecipient == address(0)) bidRecipient = best.bidder;
_transfer(askOrder.token, askOrder.signer, bidRecipient, askOrder.tokenId, best.amount);
delete bestBid[askHash];
emit Claim(askHash, best.bidder, best.amount, best.price, bidRecipient, best.referrer);
}
function _validate(Orders.Ask memory askOrder, bytes32 askHash) internal view {
require(!isCancelledOrClaimed[askHash], "SHOYU: CANCELLED_OR_CLAIMED");
require(askOrder.signer != address(0), "SHOYU: INVALID_MAKER");
require(askOrder.token != address(0), "SHOYU: INVALID_NFT");
require(askOrder.amount > 0, "SHOYU: INVALID_AMOUNT");
require(askOrder.strategy != address(0), "SHOYU: INVALID_STRATEGY");
require(askOrder.currency != address(0), "SHOYU: INVALID_CURRENCY");
require(ITokenFactory(factory()).isStrategyWhitelisted(askOrder.strategy), "SHOYU: STRATEGY_NOT_WHITELISTED");
}
function _transferFeesAndFunds(
address token,
uint256 tokenId,
address currency,
address from,
address to,
uint256 amount
) internal returns (bool) {
if (!_safeTransferFrom(currency, from, address(this), amount)) {
return false;
}
address _factory = factory();
uint256 remainder = amount;
{
(address protocolFeeRecipient, uint8 protocolFeePermil) = ITokenFactory(_factory).protocolFeeInfo();
uint256 protocolFeeAmount = (amount * protocolFeePermil) / 1000;
IERC20(currency).safeTransfer(protocolFeeRecipient, protocolFeeAmount);
remainder -= protocolFeeAmount;
}
{
(address operationalFeeRecipient, uint8 operationalFeePermil) =
ITokenFactory(_factory).operationalFeeInfo();
uint256 operationalFeeAmount = (amount * operationalFeePermil) / 1000;
IERC20(currency).safeTransfer(operationalFeeRecipient, operationalFeeAmount);
remainder -= operationalFeeAmount;
}
try IERC2981(token).royaltyInfo(tokenId, amount) returns (
address royaltyFeeRecipient,
uint256 royaltyFeeAmount
) {
if (royaltyFeeAmount > 0) {
remainder -= royaltyFeeAmount;
_transferRoyaltyFee(currency, royaltyFeeRecipient, royaltyFeeAmount);
}
} catch {}
IERC20(currency).safeTransfer(to, remainder);
return true;
}
function _safeTransferFrom(
address token,
address from,
address to,
uint256 value
) private returns (bool) {
(bool success, bytes memory returndata) =
token.call(abi.encodeWithSelector(IERC20(token).transferFrom.selector, from, to, value));
return success && (returndata.length == 0 || abi.decode(returndata, (bool)));
}
function _transferRoyaltyFee(
address currency,
address to,
uint256 amount
) internal {
IERC20(currency).safeTransfer(to, amount);
if (Address.isContract(to)) {
try IDividendPayingERC20(to).sync() returns (uint256) {} catch {}
}
}
}