Feature Tip: Add private address tag to any address under My Name Tag !
ERC-20
Overview
Max Total Supply
3,720,738.108902111206142787 SEN
Holders
126
Market
Price
$0.00 @ 0.000001 ETH
Onchain Market Cap
$12,298.23
Circulating Supply Market Cap
$67,694.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
0.000000000000000001 SENValue
$0.00 ( ~0 Eth) [0.0000%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Source Code Verified (Exact Match)
Contract Name:
SenTokenOFT
Compiler Version
v0.8.19+commit.7dd6d404
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
/** Sen Website: https://senecaprotocol.com/ Twitter: twitter.com/SenecaUSD Telegram: t.me/seneca_protocol Linktree: https://linktr.ee/senecaprotocol **/ // SPDX-License-Identifier: MIT pragma solidity 0.8.19; pragma experimental ABIEncoderV2; import "./token/oft/v1/OFT.sol"; import "./interfaces/UniswapAndSafeMath.sol"; /** * @title SEN * @author blockchainPhysicst * @notice SEN inherits from OFT, which enables SEN to create a Layer Zero bridge to other chains for the SEN token in the future * @notice addresses are given mint allowances, which can be used to mint SEN tokens */ contract SenTokenOFT is OFT { using SafeMath for uint256; IUniswapV2Router02 public uniswapV2Router; ICamelotRouter public camelotV2Router; address public uniswapV2Pair; address public camelotV2Pair; address public constant deadAddress = address(0xdead); bool private swapping; address public revShareWallet; address public treasuryWallet; uint256 public maxTransactionAmount; uint256 public swapTokensAtAmount; uint256 public maxWallet; bool public limitsInEffect = true; bool public tradingActive = false; bool public swapEnabled = false; bool public blacklistRenounced = false; uint256 public buyTotalFees; uint256 public buyRevShareFee; uint256 public buyLiquidityFee; uint256 public buyTreasuryFee; uint256 public sellTotalFees; uint256 public sellRevShareFee; uint256 public sellLiquidityFee; uint256 public sellTreasuryFee; uint256 public tokensForRevShare; uint256 public tokensForLiquidity; uint256 public tokensForTreasury; /******************/ // exclude from fees and max transaction amount mapping(address => bool) private _isExcludedFromFees; mapping(address => bool) public _isExcludedMaxTransactionAmount; mapping(address => bool) blacklisted; // store addresses that a automatic market maker pairs. Any transfer *to* these addresses // could be subject to a maximum transfer amount mapping(address => bool) public automatedMarketMakerPairs; mapping(address => bool) public isCamelotPair; event UpdateUniswapV2Router( address indexed newAddress, address indexed oldAddress ); event ExcludeFromFees(address indexed account, bool isExcluded); event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value); /////////////////ERRORS//////////////////////////////////////////////////|| error swapAmountError(uint256 amount, uint256 required); //|| error SwapAmountOutOfRange(uint256 amount, uint256 min, uint256 max); //|| error MaxTransactionAmountTooLow(uint256 amount, uint256 min); //|| error PairCannotBeRemoved(address pair, address uniswapV2Pair); //|| error MaxWalletAmountTooLow(uint256 amount, uint256 min); //|| error TransferFromZeroAddress(); //|| error TransferToZeroAddress(); //|| error TradingNotActive(); //|| error BlacklistRightsRevoked(); //|| error InvalidBlacklistAddress(address addr); //|| error TransferExceedsLimit(uint256 amount, uint256 limit); //|| error WalletLimitExceeded(uint256 amount, uint256 limit); //|| error SenderBlacklisted(address sender); //|| error ReceiverBlacklisted(address receiver); //|| error InvalidTokenAddress(address token); //|| error SellTransferExceedsLimit(uint256 amount, uint256 limit); //|| error SellFeeTooHigh(uint256 fee); //|| error BuyFeeTooHigh(uint256 fee); //|| error InvalidLiquidityPoolAddress(address lpAddress); //|| /////////////////////////////////////////////////////////////////////////|| constructor(address lzEndpoint, address uniRouter, address camelotRouter) OFT('Seneca', 'SEN', lzEndpoint) { IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02( uniRouter ); ICamelotRouter _camelotV2Router = ICamelotRouter( camelotRouter ); excludeFromMaxTransaction(address(_uniswapV2Router), true); excludeFromMaxTransaction(address(_camelotV2Router), true); uniswapV2Router = _uniswapV2Router; camelotV2Router = _camelotV2Router; uint256 _buyRevShareFee = 2; uint256 _buyLiquidityFee = 0; uint256 _buyTreasuryFee = 1; uint256 _sellRevShareFee = 2; uint256 _sellLiquidityFee = 0; uint256 _sellTreasuryFee = 1; uint256 totalSupply = 100_000_000 * 1e18; maxTransactionAmount = 1_000_000 * 1e18; // 1% maxWallet = 1_000_000 * 1e18; // 1% swapTokensAtAmount = (totalSupply * 1) / 100000; buyRevShareFee = _buyRevShareFee; buyLiquidityFee = _buyLiquidityFee; buyTreasuryFee = _buyTreasuryFee; buyTotalFees = buyRevShareFee + buyLiquidityFee + buyTreasuryFee; sellRevShareFee = _sellRevShareFee; sellLiquidityFee = _sellLiquidityFee; sellTreasuryFee = _sellTreasuryFee; sellTotalFees = sellRevShareFee + sellLiquidityFee + sellTreasuryFee; revShareWallet = address(0x4d6fd0D56800C94b6De102049750BD45A341878f); // set as revShare wallet treasuryWallet = address(0xccaB15D3C6e1DB9389135FDb8e19b25896968774); // set as Treasury wallet // exclude from paying fees or having max transaction amount excludeFromFees(owner(), true); excludeFromFees(address(this), true); excludeFromFees(address(0xdead), true); excludeFromMaxTransaction(owner(), true); excludeFromMaxTransaction(address(this), true); excludeFromMaxTransaction(address(0xdead), true); if (block.chainid == 42161) { _mint(msg.sender, totalSupply); } } receive() external payable {} // once enabled, can never be turned off function enableTrading() external onlyOwner { tradingActive = true; swapEnabled = true; } // remove limits after token is stable function removeLimits() external onlyOwner returns (bool) { limitsInEffect = false; return true; } // change the minimum amount of tokens to sell from fees function updateSwapTokensAtAmount(uint256 newAmount) external onlyOwner returns (bool) { uint256 minAmount = (totalSupply() * 1) / 100000; uint256 maxAmount = (totalSupply() * 5) / 1000; if (newAmount < minAmount || newAmount > maxAmount) { revert SwapAmountOutOfRange(newAmount, minAmount, maxAmount); } swapTokensAtAmount = newAmount; return true; } function updateMaxTxnAmount(uint256 newNum) external onlyOwner { uint256 minAmount = ((totalSupply() * 5) / 1000) / 1e18; if (newNum < minAmount) { revert MaxTransactionAmountTooLow(newNum, minAmount); } maxTransactionAmount = newNum * (10**18); } function updateMaxWalletAmount(uint256 newNum) external onlyOwner { uint256 minAmount = ((totalSupply() * 10) / 1000) / 1e18; if (newNum < minAmount) { revert MaxWalletAmountTooLow(newNum, minAmount); } maxWallet = newNum * (10**18); } function excludeFromMaxTransaction(address updAds, bool isEx) public onlyOwner { _isExcludedMaxTransactionAmount[updAds] = isEx; } // only use to disable contract sales if absolutely necessary (emergency use only) function updateSwapEnabled(bool enabled) external onlyOwner { swapEnabled = enabled; } function updateBuyFees( uint256 _revShareFee, uint256 _liquidityFee, uint256 _TreasuryFee ) external onlyOwner { buyRevShareFee = _revShareFee; buyLiquidityFee = _liquidityFee; buyTreasuryFee = _TreasuryFee; uint256 totalFees = _revShareFee + _liquidityFee + _TreasuryFee; if (totalFees > 5) { revert BuyFeeTooHigh(totalFees); } buyTotalFees = totalFees; } function updateSellFees( uint256 _revShareFee, uint256 _liquidityFee, uint256 _TreasuryFee ) external onlyOwner { sellRevShareFee = _revShareFee; sellLiquidityFee = _liquidityFee; sellTreasuryFee = _TreasuryFee; uint256 totalFees = _revShareFee + _liquidityFee + _TreasuryFee; if (totalFees > 5) { revert SellFeeTooHigh(totalFees); } sellTotalFees = totalFees; } function excludeFromFees(address account, bool excluded) public onlyOwner { _isExcludedFromFees[account] = excluded; emit ExcludeFromFees(account, excluded); } function setAutomatedMarketMakerPair(address pair, bool value, bool isCamelotType) external onlyOwner { if (pair == uniswapV2Pair) { revert PairCannotBeRemoved(pair, uniswapV2Pair); } if (pair == camelotV2Pair) { revert PairCannotBeRemoved(pair, camelotV2Pair); } _setAutomatedMarketMakerPair(pair, value); if(isCamelotType){ isCamelotPair[pair] = true; } else { isCamelotPair[pair] = false; } } function setUniswapV2Pair(address pair) external onlyOwner { uniswapV2Pair = pair; excludeFromMaxTransaction(pair, true); _setAutomatedMarketMakerPair(pair, true); isCamelotPair[pair] = false; } function setCamelotV2Pair(address pair) external onlyOwner { camelotV2Pair = pair; excludeFromMaxTransaction(pair, true); _setAutomatedMarketMakerPair(pair, true); isCamelotPair[pair] = true; } function _setAutomatedMarketMakerPair(address pair, bool value) private { automatedMarketMakerPairs[pair] = value; emit SetAutomatedMarketMakerPair(pair, value); } function updateRevShareWallet(address newRevShareWallet) external onlyOwner { revShareWallet = newRevShareWallet; } function updateTreasuryWallet(address newWallet) external onlyOwner { treasuryWallet = newWallet; } function isExcludedFromFees(address account) public view returns (bool) { return _isExcludedFromFees[account]; } function _transfer( address from, address to, uint256 amount ) internal override { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); require(!blacklisted[from],"Sender blacklisted"); require(!blacklisted[to],"Receiver blacklisted"); bool checkPairSource = false; if (amount == 0) { super._transfer(from, to, 0); return; } if (limitsInEffect) { if ( from != owner() && to != owner() && to != address(0) && to != address(0xdead) && !swapping ) { if (!tradingActive) { require( _isExcludedFromFees[from] || _isExcludedFromFees[to], "Trading is not active." ); } //when buy if ( automatedMarketMakerPairs[from] && !_isExcludedMaxTransactionAmount[to] ) { require( amount <= maxTransactionAmount, "Buy transfer amount exceeds the maxTransactionAmount." ); require( amount + balanceOf(to) <= maxWallet, "Max wallet exceeded" ); } //when sell else if ( automatedMarketMakerPairs[to] && !_isExcludedMaxTransactionAmount[from] ) { require( amount <= maxTransactionAmount, "Sell transfer amount exceeds the maxTransactionAmount." ); } else if (!_isExcludedMaxTransactionAmount[to]) { require( amount + balanceOf(to) <= maxWallet, "Max wallet exceeded" ); } } } uint256 contractTokenBalance = balanceOf(address(this)); bool canSwap = contractTokenBalance >= swapTokensAtAmount; if(isCamelotPair[from] || isCamelotPair[to]) { checkPairSource = true; } else { checkPairSource = false; } if ( canSwap && swapEnabled && !swapping && !automatedMarketMakerPairs[from] && !_isExcludedFromFees[from] && !_isExcludedFromFees[to] ) { swapping = true; swapBack(checkPairSource); swapping = false; } bool takeFee = !swapping; // if any account belongs to _isExcludedFromFee account then remove the fee if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) { takeFee = false; } uint256 fees = 0; // only take fees on buys/sells, do not take on wallet transfers if (takeFee) { // on sell if (automatedMarketMakerPairs[to] && sellTotalFees > 0) { fees = amount.mul(sellTotalFees).div(100); tokensForLiquidity += (fees * sellLiquidityFee) / sellTotalFees; tokensForTreasury += (fees * sellTreasuryFee) / sellTotalFees; tokensForRevShare += (fees * sellRevShareFee) / sellTotalFees; } // on buy else if (automatedMarketMakerPairs[from] && buyTotalFees > 0) { fees = amount.mul(buyTotalFees).div(100); tokensForLiquidity += (fees * buyLiquidityFee) / buyTotalFees; tokensForTreasury += (fees * buyTreasuryFee) / buyTotalFees; tokensForRevShare += (fees * buyRevShareFee) / buyTotalFees; } if (fees > 0) { super._transfer(from, address(this), fees); } amount -= fees; } super._transfer(from, to, amount); } function swapTokensForEth(uint256 tokenAmount, bool camelotSource) private { // generate the uniswap pair path of token -> weth address[] memory path = new address[](2); path[0] = address(this); path[1] = uniswapV2Router.WETH(); _approve(address(this), address(uniswapV2Router), tokenAmount); if (block.chainid == 42161 && camelotSource) { camelotV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens( tokenAmount, 0, path, address(this), address(this), block.timestamp ); } else if (block.chainid == 42161 && !camelotSource) { uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens( tokenAmount, 0, path, address(this), block.timestamp ); } else { uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens( tokenAmount, 0, path, address(this), block.timestamp ); } } function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private { // approve token transfer to cover all possible scenarios _approve(address(this), address(uniswapV2Router), tokenAmount); // add the liquidity uniswapV2Router.addLiquidityETH{value: ethAmount}( address(this), tokenAmount, 0, // slippage is unavoidable 0, // slippage is unavoidable owner(), block.timestamp ); } function swapBack(bool sourcePairIsCamelot) private { uint256 contractBalance = balanceOf(address(this)); uint256 totalTokensToSwap = tokensForLiquidity + tokensForRevShare + tokensForTreasury; bool success; if (contractBalance == 0 || totalTokensToSwap == 0) { return; } if (contractBalance > swapTokensAtAmount * 20) { contractBalance = swapTokensAtAmount * 20; } // Halve the amount of liquidity tokens uint256 liquidityTokens = (contractBalance * tokensForLiquidity) / totalTokensToSwap / 2; uint256 amountToSwapForETH = contractBalance.sub(liquidityTokens); uint256 initialETHBalance = address(this).balance; swapTokensForEth(amountToSwapForETH, sourcePairIsCamelot); uint256 ethBalance = address(this).balance.sub(initialETHBalance); uint256 ethForRevShare = ethBalance.mul(tokensForRevShare).div(totalTokensToSwap - (tokensForLiquidity / 2)); uint256 ethForTreasury = ethBalance.mul(tokensForTreasury).div(totalTokensToSwap - (tokensForLiquidity / 2)); uint256 ethForLiquidity = ethBalance - ethForRevShare - ethForTreasury; tokensForLiquidity = 0; tokensForRevShare = 0; tokensForTreasury = 0; (success, ) = address(treasuryWallet).call{value: ethForTreasury}(""); if (liquidityTokens > 0 && ethForLiquidity > 0) { addLiquidity(liquidityTokens, ethForLiquidity); } (success, ) = address(revShareWallet).call{value: address(this).balance}(""); } function withdrawStuckSen() external onlyOwner { uint256 balance = IERC20(address(this)).balanceOf(address(this)); IERC20(address(this)).transfer(msg.sender, balance); payable(msg.sender).transfer(address(this).balance); } function withdrawStuckToken(address _token, address _to) external onlyOwner { require(_token != address(0), "_token address cannot be 0"); uint256 _contractBalance = IERC20(_token).balanceOf(address(this)); IERC20(_token).transfer(_to, _contractBalance); } function withdrawStuckEth(address toAddr) external onlyOwner { (bool success, ) = toAddr.call{ value: address(this).balance } (""); require(success); } // @dev team renounce blacklist commands function renounceBlacklist() public onlyOwner { blacklistRenounced = true; } function blacklist(address _addr) public onlyOwner { require(!blacklistRenounced, "Team has revoked blacklist rights"); require( _addr != address(uniswapV2Pair) && _addr != address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D), "Cannot blacklist token's v2 router or v2 pool." ); blacklisted[_addr] = true; } // @dev blacklist v3 pools; can unblacklist() down the road to suit project and community function blacklistLiquidityPool(address lpAddress) public onlyOwner { require(!blacklistRenounced, "Team has revoked blacklist rights"); require( lpAddress != address(uniswapV2Pair) && lpAddress != address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D), "Cannot blacklist token's v2 router or v2 pool." ); blacklisted[lpAddress] = true; } // @dev unblacklist address; not affected by blacklistRenounced incase team wants to unblacklist v3 pools down the road function unblacklist(address _addr) public onlyOwner { blacklisted[_addr] = false; } function updateUniswapRouter(IUniswapV2Router02 newUniRouter) public onlyOwner { uniswapV2Router = newUniRouter; } function updateCamelotRouter(ICamelotRouter newCamelotRouter) public onlyOwner { camelotV2Router = newCamelotRouter; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/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() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby disabling any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(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"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * The default value of {decimals} is 18. To change this, you should override * this function so it returns a different value. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the default value returned by this function, unless * it's overridden. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer(address from, address to, uint256 amount) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by // decrementing then incrementing. _balances[to] += amount; } emit Transfer(from, to, amount); _afterTokenTransfer(from, to, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; unchecked { // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above. _balances[account] += amount; } emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; // Overflow not possible: amount <= accountBalance <= totalSupply. _totalSupply -= amount; } emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance(address owner, address spender, uint256 amount) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @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); /** * @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 `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @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 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) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol) pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol) pragma solidity ^0.8.0; /** * @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); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.19; 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) { unchecked { 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) { unchecked { 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) { unchecked { // 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) { unchecked { 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) { unchecked { 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) { return a + b; } /** * @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) { 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) { return a * b; } /** * @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. * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { 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) { 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) { unchecked { 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. * * 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) { unchecked { 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) { unchecked { require(b > 0, errorMessage); return a % b; } } } interface IUniswapV2Factory { event PairCreated( address indexed token0, address indexed token1, address pair, uint256 ); function feeTo() external view returns (address); function feeToSetter() external view returns (address); function getPair(address tokenA, address tokenB) external view returns (address pair); function allPairs(uint256) external view returns (address pair); function allPairsLength() external view returns (uint256); function createPair(address tokenA, address tokenB) external returns (address pair); function setFeeTo(address) external; function setFeeToSetter(address) external; } interface IUniswapV2Pair { event Approval( address indexed owner, address indexed spender, uint256 value ); event Transfer(address indexed from, address indexed to, uint256 value); function name() external pure returns (string memory); function symbol() external pure returns (string memory); function decimals() external pure returns (uint8); function totalSupply() external view returns (uint256); function balanceOf(address owner) external view returns (uint256); function allowance(address owner, address spender) external view returns (uint256); function approve(address spender, uint256 value) external returns (bool); function transfer(address to, uint256 value) external returns (bool); function transferFrom( address from, address to, uint256 value ) external returns (bool); function DOMAIN_SEPARATOR() external view returns (bytes32); function PERMIT_TYPEHASH() external pure returns (bytes32); function nonces(address owner) external view returns (uint256); function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; event Mint(address indexed sender, uint256 amount0, uint256 amount1); event Burn( address indexed sender, uint256 amount0, uint256 amount1, address indexed to ); event Swap( address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 amount1Out, address indexed to ); event Sync(uint112 reserve0, uint112 reserve1); function MINIMUM_LIQUIDITY() external pure returns (uint256); function factory() external view returns (address); function token0() external view returns (address); function token1() external view returns (address); function getReserves() external view returns ( uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast ); function price0CumulativeLast() external view returns (uint256); function price1CumulativeLast() external view returns (uint256); function kLast() external view returns (uint256); function mint(address to) external returns (uint256 liquidity); function burn(address to) external returns (uint256 amount0, uint256 amount1); function swap( uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data ) external; function skim(address to) external; function sync() external; function initialize(address, address) external; } interface ICamelotRouter { function factory() external pure returns (address); function WETH() external pure returns (address); function addLiquidity( address tokenA, address tokenB, uint256 amountADesired, uint256 amountBDesired, uint256 amountAMin, uint256 amountBMin, address to, uint256 deadline ) external returns ( uint256 amountA, uint256 amountB, uint256 liquidity ); function addLiquidityETH( address token, uint256 amountTokenDesired, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline ) external payable returns ( uint256 amountToken, uint256 amountETH, uint256 liquidity ); function swapExactTokensForTokensSupportingFeeOnTransferTokens( uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, address referrer, uint256 deadline ) external; function swapExactETHForTokensSupportingFeeOnTransferTokens( uint256 amountOutMin, address[] calldata path, address to, address referrer, uint256 deadline ) external payable; function swapExactTokensForETHSupportingFeeOnTransferTokens( uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, address referrer, uint256 deadline ) external; } interface IUniswapV2Router02 { function factory() external pure returns (address); function WETH() external pure returns (address); function addLiquidity( address tokenA, address tokenB, uint256 amountADesired, uint256 amountBDesired, uint256 amountAMin, uint256 amountBMin, address to, uint256 deadline ) external returns ( uint256 amountA, uint256 amountB, uint256 liquidity ); function addLiquidityETH( address token, uint256 amountTokenDesired, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline ) external payable returns ( uint256 amountToken, uint256 amountETH, uint256 liquidity ); function swapExactTokensForTokensSupportingFeeOnTransferTokens( uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline ) external; function swapExactETHForTokensSupportingFeeOnTransferTokens( uint256 amountOutMin, address[] calldata path, address to, uint256 deadline ) external payable; function swapExactTokensForETHSupportingFeeOnTransferTokens( uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline ) external; }
// SPDX-License-Identifier: Unlicense /* * @title Solidity Bytes Arrays Utils * @author Gonçalo Sá <[email protected]> * * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity. * The library lets you concatenate, slice and type cast bytes arrays both in memory and storage. */ pragma solidity >=0.8.0 <0.9.0; library BytesLib { function concat(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bytes memory) { bytes memory tempBytes; assembly { // Get a location of some free memory and store it in tempBytes as // Solidity does for memory variables. tempBytes := mload(0x40) // Store the length of the first bytes array at the beginning of // the memory for tempBytes. let length := mload(_preBytes) mstore(tempBytes, length) // Maintain a memory counter for the current write location in the // temp bytes array by adding the 32 bytes for the array length to // the starting location. let mc := add(tempBytes, 0x20) // Stop copying when the memory counter reaches the length of the // first bytes array. let end := add(mc, length) for { // Initialize a copy counter to the start of the _preBytes data, // 32 bytes into its memory. let cc := add(_preBytes, 0x20) } lt(mc, end) { // Increase both counters by 32 bytes each iteration. mc := add(mc, 0x20) cc := add(cc, 0x20) } { // Write the _preBytes data into the tempBytes memory 32 bytes // at a time. mstore(mc, mload(cc)) } // Add the length of _postBytes to the current length of tempBytes // and store it as the new length in the first 32 bytes of the // tempBytes memory. length := mload(_postBytes) mstore(tempBytes, add(length, mload(tempBytes))) // Move the memory counter back from a multiple of 0x20 to the // actual end of the _preBytes data. mc := end // Stop copying when the memory counter reaches the new combined // length of the arrays. end := add(mc, length) for { let cc := add(_postBytes, 0x20) } lt(mc, end) { mc := add(mc, 0x20) cc := add(cc, 0x20) } { mstore(mc, mload(cc)) } // Update the free-memory pointer by padding our last write location // to 32 bytes: add 31 bytes to the end of tempBytes to move to the // next 32 byte block, then round down to the nearest multiple of // 32. If the sum of the length of the two arrays is zero then add // one before rounding down to leave a blank 32 bytes (the length block with 0). mstore( 0x40, and( add(add(end, iszero(add(length, mload(_preBytes)))), 31), not(31) // Round down to the nearest 32 bytes. ) ) } return tempBytes; } function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal { assembly { // Read the first 32 bytes of _preBytes storage, which is the length // of the array. (We don't need to use the offset into the slot // because arrays use the entire slot.) let fslot := sload(_preBytes.slot) // Arrays of 31 bytes or less have an even value in their slot, // while longer arrays have an odd value. The actual length is // the slot divided by two for odd values, and the lowest order // byte divided by two for even values. // If the slot is even, bitwise and the slot with 255 and divide by // two to get the length. If the slot is odd, bitwise and the slot // with -1 and divide by two. let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2) let mlength := mload(_postBytes) let newlength := add(slength, mlength) // slength can contain both the length and contents of the array // if length < 32 bytes so let's prepare for that // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage switch add(lt(slength, 32), lt(newlength, 32)) case 2 { // Since the new array still fits in the slot, we just need to // update the contents of the slot. // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length sstore( _preBytes.slot, // all the modifications to the slot are inside this // next block add( // we can just add to the slot contents because the // bytes we want to change are the LSBs fslot, add( mul( div( // load the bytes from memory mload(add(_postBytes, 0x20)), // zero all bytes to the right exp(0x100, sub(32, mlength)) ), // and now shift left the number of bytes to // leave space for the length in the slot exp(0x100, sub(32, newlength)) ), // increase length by the double of the memory // bytes length mul(mlength, 2) ) ) ) } case 1 { // The stored value fits in the slot, but the combined value // will exceed it. // get the keccak hash to get the contents of the array mstore(0x0, _preBytes.slot) let sc := add(keccak256(0x0, 0x20), div(slength, 32)) // save new length sstore(_preBytes.slot, add(mul(newlength, 2), 1)) // The contents of the _postBytes array start 32 bytes into // the structure. Our first read should obtain the `submod` // bytes that can fit into the unused space in the last word // of the stored array. To get this, we read 32 bytes starting // from `submod`, so the data we read overlaps with the array // contents by `submod` bytes. Masking the lowest-order // `submod` bytes allows us to add that value directly to the // stored value. let submod := sub(32, slength) let mc := add(_postBytes, submod) let end := add(_postBytes, mlength) let mask := sub(exp(0x100, submod), 1) sstore(sc, add(and(fslot, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00), and(mload(mc), mask))) for { mc := add(mc, 0x20) sc := add(sc, 1) } lt(mc, end) { sc := add(sc, 1) mc := add(mc, 0x20) } { sstore(sc, mload(mc)) } mask := exp(0x100, sub(mc, end)) sstore(sc, mul(div(mload(mc), mask), mask)) } default { // get the keccak hash to get the contents of the array mstore(0x0, _preBytes.slot) // Start copying to the last used word of the stored array. let sc := add(keccak256(0x0, 0x20), div(slength, 32)) // save new length sstore(_preBytes.slot, add(mul(newlength, 2), 1)) // Copy over the first `submod` bytes of the new data as in // case 1 above. let slengthmod := mod(slength, 32) let mlengthmod := mod(mlength, 32) let submod := sub(32, slengthmod) let mc := add(_postBytes, submod) let end := add(_postBytes, mlength) let mask := sub(exp(0x100, submod), 1) sstore(sc, add(sload(sc), and(mload(mc), mask))) for { sc := add(sc, 1) mc := add(mc, 0x20) } lt(mc, end) { sc := add(sc, 1) mc := add(mc, 0x20) } { sstore(sc, mload(mc)) } mask := exp(0x100, sub(mc, end)) sstore(sc, mul(div(mload(mc), mask), mask)) } } } function slice( bytes memory _bytes, uint _start, uint _length ) internal pure returns (bytes memory) { require(_length + 31 >= _length, "slice_overflow"); require(_bytes.length >= _start + _length, "slice_outOfBounds"); bytes memory tempBytes; assembly { switch iszero(_length) case 0 { // Get a location of some free memory and store it in tempBytes as // Solidity does for memory variables. tempBytes := mload(0x40) // The first word of the slice result is potentially a partial // word read from the original array. To read it, we calculate // the length of that partial word and start copying that many // bytes into the array. The first word we copy will start with // data we don't care about, but the last `lengthmod` bytes will // land at the beginning of the contents of the new array. When // we're done copying, we overwrite the full first word with // the actual length of the slice. let lengthmod := and(_length, 31) // The multiplication in the next line is necessary // because when slicing multiples of 32 bytes (lengthmod == 0) // the following copy loop was copying the origin's length // and then ending prematurely not copying everything it should. let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod))) let end := add(mc, _length) for { // The multiplication in the next line has the same exact purpose // as the one above. let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start) } lt(mc, end) { mc := add(mc, 0x20) cc := add(cc, 0x20) } { mstore(mc, mload(cc)) } mstore(tempBytes, _length) //update free-memory pointer //allocating the array padded to 32 bytes like the compiler does now mstore(0x40, and(add(mc, 31), not(31))) } //if we want a zero-length slice let's just return a zero-length array default { tempBytes := mload(0x40) //zero out the 32 bytes slice we are about to return //we need to do it because Solidity does not garbage collect mstore(tempBytes, 0) mstore(0x40, add(tempBytes, 0x20)) } } return tempBytes; } function toAddress(bytes memory _bytes, uint _start) internal pure returns (address) { require(_bytes.length >= _start + 20, "toAddress_outOfBounds"); address tempAddress; assembly { tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000) } return tempAddress; } function toUint8(bytes memory _bytes, uint _start) internal pure returns (uint8) { require(_bytes.length >= _start + 1, "toUint8_outOfBounds"); uint8 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x1), _start)) } return tempUint; } function toUint16(bytes memory _bytes, uint _start) internal pure returns (uint16) { require(_bytes.length >= _start + 2, "toUint16_outOfBounds"); uint16 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x2), _start)) } return tempUint; } function toUint32(bytes memory _bytes, uint _start) internal pure returns (uint32) { require(_bytes.length >= _start + 4, "toUint32_outOfBounds"); uint32 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x4), _start)) } return tempUint; } function toUint64(bytes memory _bytes, uint _start) internal pure returns (uint64) { require(_bytes.length >= _start + 8, "toUint64_outOfBounds"); uint64 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x8), _start)) } return tempUint; } function toUint96(bytes memory _bytes, uint _start) internal pure returns (uint96) { require(_bytes.length >= _start + 12, "toUint96_outOfBounds"); uint96 tempUint; assembly { tempUint := mload(add(add(_bytes, 0xc), _start)) } return tempUint; } function toUint128(bytes memory _bytes, uint _start) internal pure returns (uint128) { require(_bytes.length >= _start + 16, "toUint128_outOfBounds"); uint128 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x10), _start)) } return tempUint; } function toUint256(bytes memory _bytes, uint _start) internal pure returns (uint) { require(_bytes.length >= _start + 32, "toUint256_outOfBounds"); uint tempUint; assembly { tempUint := mload(add(add(_bytes, 0x20), _start)) } return tempUint; } function toBytes32(bytes memory _bytes, uint _start) internal pure returns (bytes32) { require(_bytes.length >= _start + 32, "toBytes32_outOfBounds"); bytes32 tempBytes32; assembly { tempBytes32 := mload(add(add(_bytes, 0x20), _start)) } return tempBytes32; } function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) { bool success = true; assembly { let length := mload(_preBytes) // if lengths don't match the arrays are not equal switch eq(length, mload(_postBytes)) case 1 { // cb is a circuit breaker in the for loop since there's // no said feature for inline assembly loops // cb = 1 - don't breaker // cb = 0 - break let cb := 1 let mc := add(_preBytes, 0x20) let end := add(mc, length) for { let cc := add(_postBytes, 0x20) // the next line is the loop condition: // while(uint256(mc < end) + cb == 2) } eq(add(lt(mc, end), cb), 2) { mc := add(mc, 0x20) cc := add(cc, 0x20) } { // if any of these checks fails then arrays are not equal if iszero(eq(mload(mc), mload(cc))) { // unsuccess: success := 0 cb := 0 } } } default { // unsuccess: success := 0 } } return success; } function equalStorage(bytes storage _preBytes, bytes memory _postBytes) internal view returns (bool) { bool success = true; assembly { // we know _preBytes_offset is 0 let fslot := sload(_preBytes.slot) // Decode the length of the stored array like in concatStorage(). let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2) let mlength := mload(_postBytes) // if lengths don't match the arrays are not equal switch eq(slength, mlength) case 1 { // slength can contain both the length and contents of the array // if length < 32 bytes so let's prepare for that // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage if iszero(iszero(slength)) { switch lt(slength, 32) case 1 { // blank the last byte which is the length fslot := mul(div(fslot, 0x100), 0x100) if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) { // unsuccess: success := 0 } } default { // cb is a circuit breaker in the for loop since there's // no said feature for inline assembly loops // cb = 1 - don't breaker // cb = 0 - break let cb := 1 // get the keccak hash to get the contents of the array mstore(0x0, _preBytes.slot) let sc := keccak256(0x0, 0x20) let mc := add(_postBytes, 0x20) let end := add(mc, mlength) // the next line is the loop condition: // while(uint256(mc < end) + cb == 2) for { } eq(add(lt(mc, end), cb), 2) { sc := add(sc, 1) mc := add(mc, 0x20) } { if iszero(eq(sload(sc), mload(mc))) { // unsuccess: success := 0 cb := 0 } } } } } default { // unsuccess: success := 0 } } return success; } }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity >=0.7.6; library ExcessivelySafeCall { uint constant LOW_28_MASK = 0x00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff; /// @notice Use when you _really_ really _really_ don't trust the called /// contract. This prevents the called contract from causing reversion of /// the caller in as many ways as we can. /// @dev The main difference between this and a solidity low-level call is /// that we limit the number of bytes that the callee can cause to be /// copied to caller memory. This prevents stupid things like malicious /// contracts returning 10,000,000 bytes causing a local OOG when copying /// to memory. /// @param _target The address to call /// @param _gas The amount of gas to forward to the remote contract /// @param _maxCopy The maximum number of bytes of returndata to copy /// to memory. /// @param _calldata The data to send to the remote contract /// @return success and returndata, as `.call()`. Returndata is capped to /// `_maxCopy` bytes. function excessivelySafeCall( address _target, uint _gas, uint16 _maxCopy, bytes memory _calldata ) internal returns (bool, bytes memory) { // set up for assembly call uint _toCopy; bool _success; bytes memory _returnData = new bytes(_maxCopy); // dispatch message to recipient // by assembly calling "handle" function // we call via assembly to avoid memcopying a very large returndata // returned by a malicious contract assembly { _success := call( _gas, // gas _target, // recipient 0, // ether value add(_calldata, 0x20), // inloc mload(_calldata), // inlen 0, // outloc 0 // outlen ) // limit our copy to 256 bytes _toCopy := returndatasize() if gt(_toCopy, _maxCopy) { _toCopy := _maxCopy } // Store the length of the copied bytes mstore(_returnData, _toCopy) // copy the bytes from returndata[0:_toCopy] returndatacopy(add(_returnData, 0x20), 0, _toCopy) } return (_success, _returnData); } /// @notice Use when you _really_ really _really_ don't trust the called /// contract. This prevents the called contract from causing reversion of /// the caller in as many ways as we can. /// @dev The main difference between this and a solidity low-level call is /// that we limit the number of bytes that the callee can cause to be /// copied to caller memory. This prevents stupid things like malicious /// contracts returning 10,000,000 bytes causing a local OOG when copying /// to memory. /// @param _target The address to call /// @param _gas The amount of gas to forward to the remote contract /// @param _maxCopy The maximum number of bytes of returndata to copy /// to memory. /// @param _calldata The data to send to the remote contract /// @return success and returndata, as `.call()`. Returndata is capped to /// `_maxCopy` bytes. function excessivelySafeStaticCall( address _target, uint _gas, uint16 _maxCopy, bytes memory _calldata ) internal view returns (bool, bytes memory) { // set up for assembly call uint _toCopy; bool _success; bytes memory _returnData = new bytes(_maxCopy); // dispatch message to recipient // by assembly calling "handle" function // we call via assembly to avoid memcopying a very large returndata // returned by a malicious contract assembly { _success := staticcall( _gas, // gas _target, // recipient add(_calldata, 0x20), // inloc mload(_calldata), // inlen 0, // outloc 0 // outlen ) // limit our copy to 256 bytes _toCopy := returndatasize() if gt(_toCopy, _maxCopy) { _toCopy := _maxCopy } // Store the length of the copied bytes mstore(_returnData, _toCopy) // copy the bytes from returndata[0:_toCopy] returndatacopy(add(_returnData, 0x20), 0, _toCopy) } return (_success, _returnData); } /** * @notice Swaps function selectors in encoded contract calls * @dev Allows reuse of encoded calldata for functions with identical * argument types but different names. It simply swaps out the first 4 bytes * for the new selector. This function modifies memory in place, and should * only be used with caution. * @param _newSelector The new 4-byte selector * @param _buf The encoded contract args */ function swapSelector(bytes4 _newSelector, bytes memory _buf) internal pure { require(_buf.length >= 4); uint _mask = LOW_28_MASK; assembly { // load the first word of let _word := mload(add(_buf, 0x20)) // mask out the top 4 bytes // /x _word := and(_word, _mask) _word := or(_newSelector, _word) mstore(add(_buf, 0x20), _word) } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0; import "./ILayerZeroUserApplicationConfig.sol"; interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig { // @notice send a LayerZero message to the specified address at a LayerZero endpoint. // @param _dstChainId - the destination chain identifier // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains // @param _payload - a custom bytes payload to send to the destination contract // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination function send( uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams ) external payable; // @notice used by the messaging library to publish verified payload // @param _srcChainId - the source chain identifier // @param _srcAddress - the source contract (as bytes) at the source chain // @param _dstAddress - the address on destination chain // @param _nonce - the unbound message ordering nonce // @param _gasLimit - the gas limit for external contract execution // @param _payload - verified payload to send to the destination contract function receivePayload( uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload ) external; // @notice get the inboundNonce of a lzApp from a source chain which could be EVM or non-EVM chain // @param _srcChainId - the source chain identifier // @param _srcAddress - the source chain contract address function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64); // @notice get the outboundNonce from this source chain which, consequently, is always an EVM // @param _srcAddress - the source chain contract address function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64); // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery // @param _dstChainId - the destination chain identifier // @param _userApplication - the user app address on this EVM chain // @param _payload - the custom message to send over LayerZero // @param _payInZRO - if false, user app pays the protocol fee in native token // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain function estimateFees( uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam ) external view returns (uint nativeFee, uint zroFee); // @notice get this Endpoint's immutable source identifier function getChainId() external view returns (uint16); // @notice the interface to retry failed message on this Endpoint destination // @param _srcChainId - the source chain identifier // @param _srcAddress - the source chain contract address // @param _payload - the payload to be retried function retryPayload( uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload ) external; // @notice query if any STORED payload (message blocking) at the endpoint. // @param _srcChainId - the source chain identifier // @param _srcAddress - the source chain contract address function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool); // @notice query if the _libraryAddress is valid for sending msgs. // @param _userApplication - the user app address on this EVM chain function getSendLibraryAddress(address _userApplication) external view returns (address); // @notice query if the _libraryAddress is valid for receiving msgs. // @param _userApplication - the user app address on this EVM chain function getReceiveLibraryAddress(address _userApplication) external view returns (address); // @notice query if the non-reentrancy guard for send() is on // @return true if the guard is on. false otherwise function isSendingPayload() external view returns (bool); // @notice query if the non-reentrancy guard for receive() is on // @return true if the guard is on. false otherwise function isReceivingPayload() external view returns (bool); // @notice get the configuration of the LayerZero messaging library of the specified version // @param _version - messaging library version // @param _chainId - the chainId for the pending config change // @param _userApplication - the contract address of the user application // @param _configType - type of configuration. every messaging library has its own convention. function getConfig( uint16 _version, uint16 _chainId, address _userApplication, uint _configType ) external view returns (bytes memory); // @notice get the send() LayerZero messaging library version // @param _userApplication - the contract address of the user application function getSendVersion(address _userApplication) external view returns (uint16); // @notice get the lzReceive() LayerZero messaging library version // @param _userApplication - the contract address of the user application function getReceiveVersion(address _userApplication) external view returns (uint16); }
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0; interface ILayerZeroReceiver { // @notice LayerZero endpoint will invoke this function to deliver the message on the destination // @param _srcChainId - the source endpoint identifier // @param _srcAddress - the source sending contract address from the source chain // @param _nonce - the ordered message nonce // @param _payload - the signed payload is the UA bytes has encoded to be sent function lzReceive( uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload ) external; }
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0; interface ILayerZeroUserApplicationConfig { // @notice set the configuration of the LayerZero messaging library of the specified version // @param _version - messaging library version // @param _chainId - the chainId for the pending config change // @param _configType - type of configuration. every messaging library has its own convention. // @param _config - configuration in the bytes. can encode arbitrary content. function setConfig( uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config ) external; // @notice set the send() LayerZero messaging library version to _version // @param _version - new messaging library version function setSendVersion(uint16 _version) external; // @notice set the lzReceive() LayerZero messaging library version to _version // @param _version - new messaging library version function setReceiveVersion(uint16 _version) external; // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload // @param _srcChainId - the chainId of the source chain // @param _srcAddress - the contract address of the source contract at the source chain function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts/access/Ownable.sol"; import "./interfaces/ILayerZeroReceiver.sol"; import "./interfaces/ILayerZeroUserApplicationConfig.sol"; import "./interfaces/ILayerZeroEndpoint.sol"; import "../libraries/BytesLib.sol"; /* * a generic LzReceiver implementation */ abstract contract LzApp is Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig { using BytesLib for bytes; // ua can not send payload larger than this by default, but it can be changed by the ua owner uint public constant DEFAULT_PAYLOAD_SIZE_LIMIT = 10000; ILayerZeroEndpoint public immutable lzEndpoint; mapping(uint16 => bytes) public trustedRemoteLookup; mapping(uint16 => mapping(uint16 => uint)) public minDstGasLookup; mapping(uint16 => uint) public payloadSizeLimitLookup; address public precrime; event SetPrecrime(address precrime); event SetTrustedRemote(uint16 _remoteChainId, bytes _path); event SetTrustedRemoteAddress(uint16 _remoteChainId, bytes _remoteAddress); event SetMinDstGas(uint16 _dstChainId, uint16 _type, uint _minDstGas); constructor(address _endpoint) { lzEndpoint = ILayerZeroEndpoint(_endpoint); } function lzReceive( uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload ) public virtual override { // lzReceive must be called by the endpoint for security require(_msgSender() == address(lzEndpoint), "LzApp: invalid endpoint caller"); bytes memory trustedRemote = trustedRemoteLookup[_srcChainId]; // if will still block the message pathway from (srcChainId, srcAddress). should not receive message from untrusted remote. require( _srcAddress.length == trustedRemote.length && trustedRemote.length > 0 && keccak256(_srcAddress) == keccak256(trustedRemote), "LzApp: invalid source sending contract" ); _blockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload); } // abstract function - the default behaviour of LayerZero is blocking. See: NonblockingLzApp if you dont need to enforce ordered messaging function _blockingLzReceive( uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload ) internal virtual; function _lzSend( uint16 _dstChainId, bytes memory _payload, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams, uint _nativeFee ) internal virtual { bytes memory trustedRemote = trustedRemoteLookup[_dstChainId]; require(trustedRemote.length != 0, "LzApp: destination chain is not a trusted source"); _checkPayloadSize(_dstChainId, _payload.length); lzEndpoint.send{value: _nativeFee}(_dstChainId, trustedRemote, _payload, _refundAddress, _zroPaymentAddress, _adapterParams); } function _checkGasLimit( uint16 _dstChainId, uint16 _type, bytes memory _adapterParams, uint _extraGas ) internal view virtual { uint providedGasLimit = _getGasLimit(_adapterParams); uint minGasLimit = minDstGasLookup[_dstChainId][_type]; require(minGasLimit > 0, "LzApp: minGasLimit not set"); require(providedGasLimit >= minGasLimit + _extraGas, "LzApp: gas limit is too low"); } function _getGasLimit(bytes memory _adapterParams) internal pure virtual returns (uint gasLimit) { require(_adapterParams.length >= 34, "LzApp: invalid adapterParams"); assembly { gasLimit := mload(add(_adapterParams, 34)) } } function _checkPayloadSize(uint16 _dstChainId, uint _payloadSize) internal view virtual { uint payloadSizeLimit = payloadSizeLimitLookup[_dstChainId]; if (payloadSizeLimit == 0) { // use default if not set payloadSizeLimit = DEFAULT_PAYLOAD_SIZE_LIMIT; } require(_payloadSize <= payloadSizeLimit, "LzApp: payload size is too large"); } //---------------------------UserApplication config---------------------------------------- function getConfig( uint16 _version, uint16 _chainId, address, uint _configType ) external view returns (bytes memory) { return lzEndpoint.getConfig(_version, _chainId, address(this), _configType); } // generic config for LayerZero user Application function setConfig( uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config ) external override onlyOwner { lzEndpoint.setConfig(_version, _chainId, _configType, _config); } function setSendVersion(uint16 _version) external override onlyOwner { lzEndpoint.setSendVersion(_version); } function setReceiveVersion(uint16 _version) external override onlyOwner { lzEndpoint.setReceiveVersion(_version); } function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override onlyOwner { lzEndpoint.forceResumeReceive(_srcChainId, _srcAddress); } // _path = abi.encodePacked(remoteAddress, localAddress) // this function set the trusted path for the cross-chain communication function setTrustedRemote(uint16 _remoteChainId, bytes calldata _path) external onlyOwner { trustedRemoteLookup[_remoteChainId] = _path; emit SetTrustedRemote(_remoteChainId, _path); } function setTrustedRemoteAddress(uint16 _remoteChainId, bytes calldata _remoteAddress) external onlyOwner { trustedRemoteLookup[_remoteChainId] = abi.encodePacked(_remoteAddress, address(this)); emit SetTrustedRemoteAddress(_remoteChainId, _remoteAddress); } function getTrustedRemoteAddress(uint16 _remoteChainId) external view returns (bytes memory) { bytes memory path = trustedRemoteLookup[_remoteChainId]; require(path.length != 0, "LzApp: no trusted path record"); return path.slice(0, path.length - 20); // the last 20 bytes should be address(this) } function setPrecrime(address _precrime) external onlyOwner { precrime = _precrime; emit SetPrecrime(_precrime); } function setMinDstGas( uint16 _dstChainId, uint16 _packetType, uint _minGas ) external onlyOwner { minDstGasLookup[_dstChainId][_packetType] = _minGas; emit SetMinDstGas(_dstChainId, _packetType, _minGas); } // if the size is 0, it means default size limit function setPayloadSizeLimit(uint16 _dstChainId, uint _size) external onlyOwner { payloadSizeLimitLookup[_dstChainId] = _size; } //--------------------------- VIEW FUNCTION ---------------------------------------- function isTrustedRemote(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool) { bytes memory trustedSource = trustedRemoteLookup[_srcChainId]; return keccak256(trustedSource) == keccak256(_srcAddress); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./LzApp.sol"; import "../libraries/ExcessivelySafeCall.sol"; /* * the default LayerZero messaging behaviour is blocking, i.e. any failed message will block the channel * this abstract class try-catch all fail messages and store locally for future retry. hence, non-blocking * NOTE: if the srcAddress is not configured properly, it will still block the message pathway from (srcChainId, srcAddress) */ abstract contract NonblockingLzApp is LzApp { using ExcessivelySafeCall for address; constructor(address _endpoint) LzApp(_endpoint) {} mapping(uint16 => mapping(bytes => mapping(uint64 => bytes32))) public failedMessages; event MessageFailed(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes _payload, bytes _reason); event RetryMessageSuccess(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes32 _payloadHash); // overriding the virtual function in LzReceiver function _blockingLzReceive( uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload ) internal virtual override { (bool success, bytes memory reason) = address(this).excessivelySafeCall( gasleft(), 150, abi.encodeWithSelector(this.nonblockingLzReceive.selector, _srcChainId, _srcAddress, _nonce, _payload) ); // try-catch all errors/exceptions if (!success) { _storeFailedMessage(_srcChainId, _srcAddress, _nonce, _payload, reason); } } function _storeFailedMessage( uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload, bytes memory _reason ) internal virtual { failedMessages[_srcChainId][_srcAddress][_nonce] = keccak256(_payload); emit MessageFailed(_srcChainId, _srcAddress, _nonce, _payload, _reason); } function nonblockingLzReceive( uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload ) public virtual { // only internal transaction require(_msgSender() == address(this), "NonblockingLzApp: caller must be LzApp"); _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload); } //@notice override this function function _nonblockingLzReceive( uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload ) internal virtual; function retryMessage( uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload ) public payable virtual { // assert there is message to retry bytes32 payloadHash = failedMessages[_srcChainId][_srcAddress][_nonce]; require(payloadHash != bytes32(0), "NonblockingLzApp: no stored message"); require(keccak256(_payload) == payloadHash, "NonblockingLzApp: invalid payload"); // clear the stored message failedMessages[_srcChainId][_srcAddress][_nonce] = bytes32(0); // execute the message. revert if it fails again _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload); emit RetryMessageSuccess(_srcChainId, _srcAddress, _nonce, payloadHash); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0; import "./IOFTCore.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; /** * @dev Interface of the OFT standard */ interface IOFT is IOFTCore, IERC20 { }
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0; import "@openzeppelin/contracts/utils/introspection/IERC165.sol"; /** * @dev Interface of the IOFT core standard */ interface IOFTCore is IERC165 { /** * @dev estimate send token `_tokenId` to (`_dstChainId`, `_toAddress`) * _dstChainId - L0 defined chain id to send tokens too * _toAddress - dynamic bytes array which contains the address to whom you are sending tokens to on the dstChain * _amount - amount of the tokens to transfer * _useZro - indicates to use zro to pay L0 fees * _adapterParam - flexible bytes array to indicate messaging adapter services in L0 */ function estimateSendFee(uint16 _dstChainId, bytes calldata _toAddress, uint _amount, bool _useZro, bytes calldata _adapterParams) external view returns (uint nativeFee, uint zroFee); /** * @dev send `_amount` amount of token to (`_dstChainId`, `_toAddress`) from `_from` * `_from` the owner of token * `_dstChainId` the destination chain identifier * `_toAddress` can be any size depending on the `dstChainId`. * `_amount` the quantity of tokens in wei * `_refundAddress` the address LayerZero refunds if too much message fee is sent * `_zroPaymentAddress` set to address(0x0) if not paying in ZRO (LayerZero Token) * `_adapterParams` is a flexible bytes array to indicate messaging adapter services */ function sendFrom(address _from, uint16 _dstChainId, bytes calldata _toAddress, uint _amount, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable; /** * @dev returns the circulating amount of tokens on current chain */ function circulatingSupply() external view returns (uint); /** * @dev returns the address of the ERC20 token */ function token() external view returns (address); /** * @dev Emitted when `_amount` tokens are moved from the `_sender` to (`_dstChainId`, `_toAddress`) * `_nonce` is the outbound nonce */ event SendToChain(uint16 indexed _dstChainId, address indexed _from, bytes _toAddress, uint _amount); /** * @dev Emitted when `_amount` tokens are received from `_srcChainId` into the `_toAddress` on the local chain. * `_nonce` is the inbound nonce. */ event ReceiveFromChain(uint16 indexed _srcChainId, address indexed _to, uint _amount); event SetUseCustomAdapterParams(bool _useCustomAdapterParams); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/utils/introspection/IERC165.sol"; import "./interfaces/IOFT.sol"; import "./OFTCore.sol"; // override decimal() function is needed contract OFT is OFTCore, ERC20, IOFT { constructor( string memory _name, string memory _symbol, address _lzEndpoint ) ERC20(_name, _symbol) OFTCore(_lzEndpoint) { } function supportsInterface(bytes4 interfaceId) public view virtual override(OFTCore, IERC165) returns (bool) { return interfaceId == type(IOFT).interfaceId || interfaceId == type(IERC20).interfaceId || super.supportsInterface(interfaceId); } function token() public view virtual override returns (address) { return address(this); } function circulatingSupply() public view virtual override returns (uint) { return totalSupply(); } function _debitFrom( address _from, uint16, bytes memory, uint _amount ) internal virtual override returns (uint) { address spender = _msgSender(); if (_from != spender) _spendAllowance(_from, spender, _amount); _burn(_from, _amount); return _amount; } function _creditTo( uint16, address _toAddress, uint _amount ) internal virtual override returns (uint) { _mint(_toAddress, _amount); return _amount; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../../../lzApp/NonblockingLzApp.sol"; import "./interfaces/IOFTCore.sol"; import "@openzeppelin/contracts/utils/introspection/ERC165.sol"; abstract contract OFTCore is NonblockingLzApp, ERC165, IOFTCore { using BytesLib for bytes; uint public constant NO_EXTRA_GAS = 0; // packet type uint16 public constant PT_SEND = 0; bool public useCustomAdapterParams; constructor(address _lzEndpoint) NonblockingLzApp(_lzEndpoint) {} function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IOFTCore).interfaceId || super.supportsInterface(interfaceId); } function estimateSendFee( uint16 _dstChainId, bytes calldata _toAddress, uint _amount, bool _useZro, bytes calldata _adapterParams ) public view virtual override returns (uint nativeFee, uint zroFee) { // mock the payload for sendFrom() bytes memory payload = abi.encode(PT_SEND, _toAddress, _amount); return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams); } function sendFrom( address _from, uint16 _dstChainId, bytes calldata _toAddress, uint _amount, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams ) public payable virtual override { _send(_from, _dstChainId, _toAddress, _amount, _refundAddress, _zroPaymentAddress, _adapterParams); } function setUseCustomAdapterParams(bool _useCustomAdapterParams) public virtual onlyOwner { useCustomAdapterParams = _useCustomAdapterParams; emit SetUseCustomAdapterParams(_useCustomAdapterParams); } function _nonblockingLzReceive( uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload ) internal virtual override { uint16 packetType; assembly { packetType := mload(add(_payload, 32)) } if (packetType == PT_SEND) { _sendAck(_srcChainId, _srcAddress, _nonce, _payload); } else { revert("OFTCore: unknown packet type"); } } function _send( address _from, uint16 _dstChainId, bytes memory _toAddress, uint _amount, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams ) internal virtual { _checkAdapterParams(_dstChainId, PT_SEND, _adapterParams, NO_EXTRA_GAS); uint amount = _debitFrom(_from, _dstChainId, _toAddress, _amount); bytes memory lzPayload = abi.encode(PT_SEND, _toAddress, amount); _lzSend(_dstChainId, lzPayload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value); emit SendToChain(_dstChainId, _from, _toAddress, amount); } function _sendAck( uint16 _srcChainId, bytes memory, uint64, bytes memory _payload ) internal virtual { (, bytes memory toAddressBytes, uint amount) = abi.decode(_payload, (uint16, bytes, uint)); address to = toAddressBytes.toAddress(0); amount = _creditTo(_srcChainId, to, amount); emit ReceiveFromChain(_srcChainId, to, amount); } function _checkAdapterParams( uint16 _dstChainId, uint16 _pkType, bytes memory _adapterParams, uint _extraGas ) internal virtual { if (useCustomAdapterParams) { _checkGasLimit(_dstChainId, _pkType, _adapterParams, _extraGas); } else { require(_adapterParams.length == 0, "OFTCore: _adapterParams must be empty."); } } function _debitFrom( address _from, uint16 _dstChainId, bytes memory _toAddress, uint _amount ) internal virtual returns (uint); function _creditTo( uint16 _srcChainId, address _toAddress, uint _amount ) internal virtual returns (uint); }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000066a71dcef29a0ffbdbe3c6a460a3b5bc225cd6750000000000000000000000007a250d5630b4cf539739df2c5dacb4c659f2488d0000000000000000000000007a250d5630b4cf539739df2c5dacb4c659f2488d
-----Decoded View---------------
Arg [0] : lzEndpoint (address): 0x66A71Dcef29A0fFBDBE3c6a460a3B5BC225Cd675
Arg [1] : uniRouter (address): 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
Arg [2] : camelotRouter (address): 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000066a71dcef29a0ffbdbe3c6a460a3b5bc225cd675
Arg [1] : 0000000000000000000000007a250d5630b4cf539739df2c5dacb4c659f2488d
Arg [2] : 0000000000000000000000007a250d5630b4cf539739df2c5dacb4c659f2488d
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