Contract Name:
Sales721ForEth
Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;
import "./Dependencies/Ownable.sol";
import "./Dependencies/SafeMath.sol";
import "./Dependencies/SafeERC20.sol";
import "./Dependencies/IERC20.sol";
import "./Dependencies/IERC721.sol";
import "./Dependencies/ReentrancyGuard.sol";
contract Sales721ForEth is Ownable, ReentrancyGuard {
using SafeMath for uint256;
using SafeERC20 for IERC20;
// set the saleIDCounter initial value to 1
uint256 private saleIDCounter = 1;
bool private onlyInitOnce;
struct BaseSale {
// the sale setter
address seller;
// addresses of token to sell
address tokenAddresses;
// tokenIDs of token to sell
uint256[] tokenIDs;
// address of token to pay
address payTokenAddress;
// price of token to pay
uint256 price;
// address of receiver
address receiver;
uint256 startTime;
uint256 endTime;
// whether the sale is available
bool isAvailable;
}
struct FlashSale {
BaseSale base;
// max number of token could be bought from an address
uint256 purchaseLimitation;
}
struct Auction {
BaseSale base;
// the minimum increment in a bid
uint256 minBidIncrement;
// the highest price so far
uint256 highestBidPrice;
// the highest bidder so far
address highestBidder;
}
struct Activity {
uint256 limitation;
uint256 activityId;
uint256[] salesIDs;
bool isEnable;
}
struct WhitelistActivity {
bool isWhitelist;
mapping(address => bool) whitelists;
}
// whitelist to set sale
mapping(address => bool) public whitelist;
// sale ID -> flash sale
mapping(uint256 => FlashSale) flashSales;
// sale ID -> mapping(address => how many tokens have bought)
mapping(uint256 => mapping(address => uint256)) flashSaleIDToPurchaseRecord;
// sale ID -> auction
mapping(uint256 => Auction) auctions;
// filter to check repetition
mapping(address => mapping(uint256 => bool)) repetitionFilter;
address public testServerAddress;
address public serverAddress;
// sale ID -> server hash
mapping(bytes32 => uint256) serverHashMap;
// whitelist to set sale
mapping(uint256 => bool) public flashSaleOnProd;
//activityId => activity
mapping(uint256 => Activity) public activityMap;
//salesId => activityId
mapping(uint256 => uint256) public activityIndex;
//activityID => WhitelistActivity
mapping(uint256 => WhitelistActivity) public activityWhitelist;
event SetWhitelist(address _member, bool _isAdded);
event SetFlashSale(
uint256 _saleID,
address _flashSaleSetter,
address _tokenAddresses,
uint256[] _tokenIDs,
address _payTokenAddress,
uint256 _price,
address _receiver,
uint256 _purchaseLimitation,
uint256 _startTime,
uint256 _endTime
);
event UpdateFlashSale(
uint256 _saleID,
address _operator,
address _newTokenAddresses,
uint256[] _newTokenIDs,
address _newPayTokenAddress,
uint256 _newPrice,
address _newReceiver,
uint256 _newPurchaseLimitation,
uint256 _newStartTime,
uint256 _newEndTime
);
event CancelFlashSale(uint256 _saleID, address _operator);
event FlashSaleExpired(uint256 _saleID, address _operator);
event Purchase(
uint256 _saleID,
address _buyer,
address _tokenAddresses,
uint256[] _tokenIDs,
address _payTokenAddress,
uint256 _totalPayment
);
event SetAuction(
uint256 _saleID,
address _auctionSetter,
address _tokenAddresses,
uint256[] _tokenIDs,
address _payTokenAddress,
uint256 _initialPrice,
address _receiver,
uint256 _minBidIncrement,
uint256 _startTime,
uint256 _endTime
);
event UpdateAuction(
uint256 _saleID,
address _operator,
address _newTokenAddresses,
uint256[] _newTokenIDs,
address _newPayTokenAddress,
uint256 _newInitialPrice,
address _newReceiver,
uint256 _newMinBidIncrement,
uint256 _newStartTime,
uint256 _newEndTime
);
event RefundToPreviousBidder(
uint256 _saleID,
address _previousBidder,
address _payTokenAddress,
uint256 _refundAmount
);
event CancelAuction(uint256 _saleID, address _operator);
event NewBidderTransfer(uint256 _saleID, address _newBidder, address _payTokenAddress, uint256 _bidPrice);
event SettleAuction(
uint256 _saleID,
address _operator,
address _receiver,
address _highestBidder,
address _tokenAddresses,
uint256[] _tokenIDs,
address _payTokenAddress,
uint256 _highestBidPrice
);
event MainCoin(uint256 totalPayment);
modifier onlyWhitelist() {
require(whitelist[msg.sender], "the caller isn't in the whitelist");
_;
}
function init(address _newOwner) public {
require(!onlyInitOnce, "already initialized");
_transferOwnership(_newOwner);
onlyInitOnce = true;
}
function getActivity(uint256 id) external view returns (Activity memory) {
return activityMap[id];
}
//return the amount of all sales
function getActivityTotalAmount(uint256 activityId, address puchaser) public view returns (uint256) {
Activity memory activity = activityMap[activityId];
uint256 total;
for (uint256 i = 0; i < activity.salesIDs.length; i++) {
uint256 saleId = activity.salesIDs[i];
total = total + flashSaleIDToPurchaseRecord[saleId][puchaser];
}
return total;
}
function setActivity(Activity memory activity) external onlyOwner {
activityMap[activity.activityId] = activity;
for (uint256 i = 0; i < activity.salesIDs.length; i++) {
uint256 saleId = activity.salesIDs[i];
activityIndex[saleId] = activity.activityId;
}
}
function setWhitelist(address _member, bool _status) external onlyOwner {
whitelist[_member] = _status;
emit SetWhitelist(_member, _status);
}
// set auction by the member in whitelist
function setAuction(
address _tokenAddresses,
uint256[] memory _tokenIDs,
address _payTokenAddress,
uint256 _initialPrice,
address _receiver,
uint256 _minBidIncrement,
uint256 _startTime,
uint256 _duration
) external nonReentrant onlyWhitelist {
// 1. check the validity of params
_checkAuctionParams(
msg.sender,
_tokenAddresses,
_tokenIDs,
_initialPrice,
_minBidIncrement,
_startTime,
_duration
);
// 2. build auction
Auction memory auction = Auction({
base: BaseSale({
seller: msg.sender,
tokenAddresses: _tokenAddresses,
tokenIDs: _tokenIDs,
payTokenAddress: _payTokenAddress,
price: _initialPrice,
receiver: _receiver,
startTime: _startTime,
endTime: _startTime.add(_duration),
isAvailable: true
}),
minBidIncrement: _minBidIncrement,
highestBidPrice: 0,
highestBidder: address(0)
});
// 3. store auction
uint256 currentSaleID = saleIDCounter;
saleIDCounter = saleIDCounter.add(1);
auctions[currentSaleID] = auction;
emit SetAuction(
currentSaleID,
auction.base.seller,
auction.base.tokenAddresses,
auction.base.tokenIDs,
auction.base.payTokenAddress,
auction.base.price,
auction.base.receiver,
auction.minBidIncrement,
auction.base.startTime,
auction.base.endTime
);
}
// update auction by the member in whitelist
function updateAuction(
uint256 _saleID,
address _tokenAddresses,
uint256[] memory _tokenIDs,
address _payTokenAddress,
uint256 _initialPrice,
address _receiver,
uint256 _minBidIncrement,
uint256 _startTime,
uint256 _duration
) external nonReentrant onlyWhitelist {
Auction memory auction = _getAuctionByID(_saleID);
// 1. make sure that the auction doesn't start
require(auction.base.startTime > now, "it's not allowed to update the auction after the start of it");
require(auction.base.isAvailable, "the auction has been cancelled");
require(auction.base.seller == msg.sender, "the auction can only be updated by its setter");
// 2. check the validity of params to update
_checkAuctionParams(
msg.sender,
_tokenAddresses,
_tokenIDs,
_initialPrice,
_minBidIncrement,
_startTime,
_duration
);
// 3. update the auction
auction.base.tokenAddresses = _tokenAddresses;
auction.base.tokenIDs = _tokenIDs;
auction.base.payTokenAddress = _payTokenAddress;
auction.base.price = _initialPrice;
auction.base.receiver = _receiver;
auction.base.startTime = _startTime;
auction.base.endTime = _startTime.add(_duration);
auction.minBidIncrement = _minBidIncrement;
auctions[_saleID] = auction;
emit UpdateAuction(
_saleID,
auction.base.seller,
auction.base.tokenAddresses,
auction.base.tokenIDs,
auction.base.payTokenAddress,
auction.base.price,
auction.base.receiver,
auction.minBidIncrement,
auction.base.startTime,
auction.base.endTime
);
}
// cancel the auction
function cancelAuction(uint256 _saleID) external nonReentrant onlyWhitelist {
Auction memory auction = _getAuctionByID(_saleID);
require(auction.base.isAvailable, "the auction isn't available");
require(auction.base.seller == msg.sender, "the auction can only be cancelled by its setter");
if (auction.highestBidPrice != 0) {
// some bid has paid for this auction
IERC20(auction.base.payTokenAddress).safeTransfer(auction.highestBidder, auction.highestBidPrice);
emit RefundToPreviousBidder(
_saleID,
auction.highestBidder,
auction.base.payTokenAddress,
auction.highestBidPrice
);
}
auctions[_saleID].base.isAvailable = false;
emit CancelAuction(_saleID, msg.sender);
}
// bid for the target auction
function bid(uint256 _saleID, uint256 _bidPrice) external nonReentrant {
Auction memory auction = _getAuctionByID(_saleID);
// check the validity of the target auction
require(auction.base.isAvailable, "the auction isn't available");
require(auction.base.seller != msg.sender, "the setter can't bid for its own auction");
uint256 currentTime = now;
require(currentTime >= auction.base.startTime, "the auction doesn't start");
require(currentTime < auction.base.endTime, "the auction has expired");
IERC20 payToken = IERC20(auction.base.payTokenAddress);
// check bid price in auction
if (auction.highestBidPrice != 0) {
// not first bid
require(
_bidPrice.sub(auction.highestBidPrice) >= auction.minBidIncrement,
"the bid price must be larger than the sum of current highest one and minimum bid increment"
);
// refund to the previous highest bidder from this contract
payToken.safeTransfer(auction.highestBidder, auction.highestBidPrice);
emit RefundToPreviousBidder(
_saleID,
auction.highestBidder,
auction.base.payTokenAddress,
auction.highestBidPrice
);
} else {
// first bid
require(_bidPrice == auction.base.price, "first bid must follow the initial price set in the auction");
}
// update storage auctions
auctions[_saleID].highestBidPrice = _bidPrice;
auctions[_saleID].highestBidder = msg.sender;
// transfer the bid price into this contract
payToken.safeApprove(address(this), 0);
payToken.safeApprove(address(this), _bidPrice);
payToken.safeTransferFrom(msg.sender, address(this), _bidPrice);
emit NewBidderTransfer(_saleID, msg.sender, auction.base.payTokenAddress, _bidPrice);
}
// settle the auction by the member in whitelist
function settleAuction(uint256 _saleID) external nonReentrant onlyWhitelist {
Auction memory auction = _getAuctionByID(_saleID);
// check the validity of the target auction
require(auction.base.isAvailable, "only the available auction can be settled");
require(auction.base.endTime <= now, "the auction can only be settled after its end time");
if (auction.highestBidPrice != 0) {
// the auction has been bidden
// transfer pay token to the receiver from this contract
IERC20(auction.base.payTokenAddress).safeTransfer(auction.base.receiver, auction.highestBidPrice);
// transfer erc721s to the bidder who keeps the highest price
for (uint256 i = 0; i < auction.base.tokenIDs.length; i++) {
IERC721(auction.base.tokenAddresses).safeTransferFrom(
auction.base.seller,
auction.highestBidder,
auction.base.tokenIDs[i]
);
}
}
// close the auction
auctions[_saleID].base.isAvailable = false;
emit SettleAuction(
_saleID,
msg.sender,
auction.base.receiver,
auction.highestBidder,
auction.base.tokenAddresses,
auction.base.tokenIDs,
auction.base.payTokenAddress,
auction.highestBidPrice
);
}
event AddTokens(uint256[] _tokenIds, uint256 _saleID);
function addTokenIdToSale(
uint256 _saleID,
address _tokenAddresses,
uint256[] memory _tokenIDs
) external onlyWhitelist {
uint256 standardLen = _tokenIDs.length;
require(standardLen > 0, "length of tokenAddresses must be > 0");
require(flashSales[_saleID].base.startTime > now, "it's not allowed to update the sale after the start of it");
require(flashSales[_saleID].base.seller == msg.sender, "the sale can only be updated by its setter");
IERC721 tokenAddressCached = IERC721(_tokenAddresses);
for (uint256 i = 0; i < _tokenIDs.length; i++) {
uint256 tokenId = _tokenIDs[i];
require(
tokenAddressCached.ownerOf(tokenId) == flashSales[_saleID].base.seller,
"unmatched ownership of target ERC721 token"
);
flashSales[_saleID].base.tokenIDs.push(tokenId);
}
emit AddTokens(_tokenIDs, _saleID);
}
// set flash sale by the member in whitelist
// NOTE: set 0 duration if you don't want an endTime
function setFlashSale(
address _tokenAddresses,
uint256[] memory _tokenIDs,
address _payTokenAddress,
uint256 _price,
address _receiver,
uint256 _purchaseLimitation,
uint256 _startTime,
uint256 _duration,
bool prod
) external nonReentrant onlyWhitelist {
// 1. check the validity of params
_checkFlashSaleParams(msg.sender, _tokenAddresses, _tokenIDs, _price, _startTime, _purchaseLimitation);
// 2. build flash sale
uint256 endTime;
if (_duration != 0) {
endTime = _startTime.add(_duration);
}
FlashSale memory flashSale = FlashSale({
base: BaseSale({
seller: msg.sender,
tokenAddresses: _tokenAddresses,
tokenIDs: _tokenIDs,
payTokenAddress: _payTokenAddress,
price: _price,
receiver: _receiver,
startTime: _startTime,
endTime: endTime,
isAvailable: true
}),
purchaseLimitation: _purchaseLimitation
});
// 3. store flash sale
uint256 currentSaleID = saleIDCounter;
saleIDCounter = saleIDCounter.add(1);
flashSales[currentSaleID] = flashSale;
//if true then prod env else test env
flashSaleOnProd[currentSaleID] = prod;
emit SetFlashSale(
currentSaleID,
flashSale.base.seller,
flashSale.base.tokenAddresses,
flashSale.base.tokenIDs,
flashSale.base.payTokenAddress,
flashSale.base.price,
flashSale.base.receiver,
flashSale.purchaseLimitation,
flashSale.base.startTime,
flashSale.base.endTime
);
}
// update the flash sale before starting
// NOTE: set 0 duration if you don't want an endTime
function updateFlashSale(
uint256 _saleID,
address _tokenAddresses,
uint256[] memory _tokenIDs,
address _payTokenAddress,
uint256 _price,
address _receiver,
uint256 _purchaseLimitation,
uint256 _startTime,
uint256 _duration
) external nonReentrant onlyWhitelist {
FlashSale memory flashSale = _getFlashSaleByID(_saleID);
// 1. make sure that the flash sale doesn't start
require(flashSale.base.startTime > now, "it's not allowed to update the flash sale after the start of it");
require(flashSale.base.isAvailable, "the flash sale has been cancelled");
require(flashSale.base.seller == msg.sender, "the flash sale can only be updated by its setter");
// 2. check the validity of params to update
_checkFlashSaleParams(msg.sender, _tokenAddresses, _tokenIDs, _price, _startTime, _purchaseLimitation);
// 3. update flash sale
uint256 endTime;
if (_duration != 0) {
endTime = _startTime.add(_duration);
}
flashSale.base.tokenAddresses = _tokenAddresses;
flashSale.base.tokenIDs = _tokenIDs;
flashSale.base.payTokenAddress = _payTokenAddress;
flashSale.base.price = _price;
flashSale.base.receiver = _receiver;
flashSale.base.startTime = _startTime;
flashSale.base.endTime = endTime;
flashSale.purchaseLimitation = _purchaseLimitation;
flashSales[_saleID] = flashSale;
emit UpdateFlashSale(
_saleID,
flashSale.base.seller,
flashSale.base.tokenAddresses,
flashSale.base.tokenIDs,
flashSale.base.payTokenAddress,
flashSale.base.price,
flashSale.base.receiver,
flashSale.purchaseLimitation,
flashSale.base.startTime,
flashSale.base.endTime
);
}
// cancel the flash sale
function cancelFlashSale(uint256 _saleID) external onlyWhitelist {
FlashSale memory flashSale = _getFlashSaleByID(_saleID);
require(flashSale.base.isAvailable, "the flash sale isn't available");
require(flashSale.base.seller == msg.sender, "the flash sale can only be cancelled by its setter");
flashSales[_saleID].base.isAvailable = false;
emit CancelFlashSale(_saleID, msg.sender);
}
function setServerAddress(address targetAddress) public onlyOwner {
serverAddress = targetAddress;
}
function setTestServerAddress(address targetAddress) public onlyOwner {
testServerAddress = targetAddress;
}
function setFlashSaleEnv(uint256 _saleID, bool isProd) public nonReentrant onlyOwner {
flashSaleOnProd[_saleID] = isProd;
}
function setActivityWhitelist(
uint256 _activityId,
address[] calldata users
) external onlyOwner{
activityWhitelist[_activityId].isWhitelist = true;
for (uint256 i = 0; i < users.length; i++) {
activityWhitelist[_activityId].whitelists[users[i]] = true;
}
}
// rush to purchase by anyone
function purchase(
uint256 _saleID,
uint256 _amount,
bytes32 hash,
uint8 v,
bytes32 r,
bytes32 s
) external payable nonReentrant {
if (flashSaleOnProd[_saleID] == true) {
require(ecrecover(hash, v, r, s) == serverAddress, "verify prod server sign failed");
} else {
require(ecrecover(hash, v, r, s) == testServerAddress, "verify test server sign failed");
}
// we have set saleIDCounter initial value to 1 to prevent when _saleID = 0 from can not being purchased
require(serverHashMap[hash] != _saleID, "sign hash repeat");
FlashSale memory flashSale = _getFlashSaleByID(_saleID);
// check the validity
require(_amount > 0, "amount should be > 0");
require(flashSale.base.isAvailable, "the flash sale isn't available");
require(flashSale.base.seller != msg.sender, "the setter can't make a purchase from its own flash sale");
uint256 currentTime = now;
require(currentTime >= flashSale.base.startTime, "the flash sale doesn't start");
// check whether the end time arrives
if (flashSale.base.endTime != 0 && flashSale.base.endTime <= currentTime) {
// the flash sale has been set an end time and expired
flashSales[_saleID].base.isAvailable = false;
emit FlashSaleExpired(_saleID, msg.sender);
return;
}
// check the purchase record of the buyer
uint256 newPurchaseRecord = flashSaleIDToPurchaseRecord[_saleID][msg.sender].add(_amount);
//activity model
uint256 activityId = activityIndex[_saleID];
if (activityMap[activityId].isEnable) {
//check if need the whitelist
require(!activityWhitelist[activityId].isWhitelist || activityWhitelist[activityId].whitelists[msg.sender], "Not in the Whitelist");
Activity memory activity = activityMap[activityId];
uint256 activityAmount = getActivityTotalAmount(activity.activityId, msg.sender);
require(
activityAmount.add(_amount) <= activity.limitation,
"total amount to purchase for activity exceeds the limitation of an address"
);
}
require(
newPurchaseRecord <= flashSale.purchaseLimitation,
"total amount to purchase exceeds the limitation of an address"
);
// check whether the amount of token rest in flash sale is sufficient for this trade
require(_amount <= flashSale.base.tokenIDs.length, "insufficient amount of token for this trade");
// pay the receiver
flashSaleIDToPurchaseRecord[_saleID][msg.sender] = newPurchaseRecord;
uint256 totalPayment = flashSale.base.price.mul(_amount);
//IERC20(flashSale.base.payTokenAddress).safeTransferFrom(msg.sender, flashSale.base.receiver, totalPayment);
if (flashSale.base.payTokenAddress != address(0)) {
IERC20(flashSale.base.payTokenAddress).safeTransferFrom(msg.sender, flashSale.base.receiver, totalPayment);
} else {
require(msg.value >= totalPayment, "amount should be > totalPayment");
emit MainCoin(totalPayment);
payable(flashSale.base.receiver).transfer(totalPayment);
}
// transfer erc721 tokens to buyer
uint256[] memory tokenIDsRecord = new uint256[](_amount);
uint256 targetIndex = flashSale.base.tokenIDs.length - 1;
for (uint256 i = 0; i < _amount; i++) {
IERC721(flashSale.base.tokenAddresses).safeTransferFrom(
flashSale.base.seller,
msg.sender,
flashSale.base.tokenIDs[targetIndex]
);
tokenIDsRecord[i] = flashSale.base.tokenIDs[targetIndex];
targetIndex--;
flashSales[_saleID].base.tokenIDs.pop();
}
if (flashSales[_saleID].base.tokenIDs.length == 0) {
flashSales[_saleID].base.isAvailable = false;
}
serverHashMap[hash] = _saleID;
//event Purchase(uint _saleID, address _buyer, address _tokenAddresses, uint[] _tokenIDs, address _payTokenAddress, uint _totalPayment);
emit Purchase(
_saleID,
msg.sender,
flashSale.base.tokenAddresses,
tokenIDsRecord,
flashSale.base.payTokenAddress,
totalPayment
);
}
function getFlashSaleTokenRemaining(uint256 _saleID) public view returns (uint256) {
// check whether the flash sale ID exists
FlashSale memory flashSale = _getFlashSaleByID(_saleID);
return flashSale.base.tokenIDs.length;
}
function getFlashSalePurchaseRecord(uint256 _saleID, address _buyer) public view returns (uint256) {
// check whether the flash sale ID exists
_getFlashSaleByID(_saleID);
return flashSaleIDToPurchaseRecord[_saleID][_buyer];
}
function getAuctionTokenAmount(uint256 _saleID) public view returns (uint256 amount) {
Auction memory auction = auctions[_saleID];
amount = auction.base.tokenIDs.length;
}
function getFlashSaleTokenAmount(uint256 _saleID) public view returns (uint256 amount) {
FlashSale memory flashSale = flashSales[_saleID];
amount = flashSale.base.tokenIDs.length;
}
function getAuction(uint256 _saleID) public view returns (Auction memory) {
return _getAuctionByID(_saleID);
}
function getFlashSale(uint256 _saleID) public view returns (FlashSale memory) {
return _getFlashSaleByID(_saleID);
}
function getCurrentSaleID() external view returns (uint256) {
return saleIDCounter;
}
function _getAuctionByID(uint256 _saleID) internal view returns (Auction memory auction) {
auction = auctions[_saleID];
require(auction.base.seller != address(0), "the target auction doesn't exist");
}
function _getFlashSaleByID(uint256 _saleID) internal view returns (FlashSale memory flashSale) {
flashSale = flashSales[_saleID];
require(flashSale.base.seller != address(0), "the target flash sale doesn't exist");
}
function _checkAuctionParams(
address _baseSaleSetter,
address _tokenAddresses,
uint256[] memory _tokenIDs,
uint256 _initialPrice,
uint256 _minBidIncrement,
uint256 _startTime,
uint256 _duration
) internal {
_checkBaseSaleParams(_baseSaleSetter, _tokenAddresses, _tokenIDs, _initialPrice, _startTime);
require(_minBidIncrement > 0, "minBidIncrement must be > 0");
require(_duration > 0, "duration must be > 0");
}
function _checkFlashSaleParams(
address _baseSaleSetter,
address _tokenAddresses,
uint256[] memory _tokenIDs,
uint256 _price,
uint256 _startTime,
uint256 _purchaseLimitation
) internal {
uint256 standardLen = _checkBaseSaleParams(_baseSaleSetter, _tokenAddresses, _tokenIDs, _price, _startTime);
require(_purchaseLimitation > 0, "purchaseLimitation must be > 0");
/* require(_purchaseLimitation <= standardLen,
"purchaseLimitation must be <= the length of tokenAddresses");*/
}
function _checkBaseSaleParams(
address _baseSaleSetter,
address _tokenAddresses,
uint256[] memory _tokenIDs,
uint256 _price,
uint256 _startTime
) internal returns (uint256 standardLen) {
standardLen = _tokenIDs.length;
// check whether the sale setter has the target tokens && approval
IERC721 tokenAddressCached = IERC721(_tokenAddresses);
uint256 tokenIDCached;
for (uint256 i = 0; i < standardLen; i++) {
tokenIDCached = _tokenIDs[i];
// check repetition
require(!repetitionFilter[address(tokenAddressCached)][tokenIDCached], "repetitive ERC721 tokens");
repetitionFilter[address(tokenAddressCached)][tokenIDCached] = true;
require(
tokenAddressCached.ownerOf(tokenIDCached) == _baseSaleSetter,
"unmatched ownership of target ERC721 token"
);
require(
tokenAddressCached.getApproved(tokenIDCached) == address(this) ||
tokenAddressCached.isApprovedForAll(_baseSaleSetter, address(this)),
"the contract hasn't been approved for ERC721 transferring"
);
}
require(_price >= 0, "the price or the initial price must be >= 0");
require(_startTime >= now, "startTime must be >= now");
// clear filter
for (uint256 i = 0; i < standardLen; i++) {
repetitionFilter[_tokenAddresses][_tokenIDs[i]] = false;
}
}
using Address for address payable;
using Address for address;
function withdraw(
address token,
address to,
uint256 amount
) external onlyOwner {
if (token.isContract()) {
IERC20(token).safeTransfer(to, amount);
} else {
payable(to).sendValue(amount);
}
emit EmergencyWithdraw(token, to, amount);
}
event EmergencyWithdraw(address token, address to, uint256 amount);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
import "./Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b > a) return (false, 0);
return (true, a - b);
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a / b);
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a % b);
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a, "SafeMath: subtraction overflow");
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) return 0;
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "SafeMath: division by zero");
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "SafeMath: modulo by zero");
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
return a - b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryDiv}.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
return a % b;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
import "./IERC20.sol";
import "./SafeMath.sol";
import "./Address.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) {// Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
import "./IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () internal {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this;
// silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly {size := extcodesize(account)}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success,) = recipient.call{value : amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{value : value}(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.staticcall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}