Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "../libraries/AntiWhaleToken.sol";
import "../libraries/ERC20Base.sol";
import "../libraries/ERC20Burnable.sol";
import "../libraries/TaxableToken.sol";
/**
* @dev ERC20Token implementation with Burn, AntiWhale, Tax capabilities
*/
contract DORK is
ERC20Base,
AntiWhaleToken,
ERC20Burnable,
Ownable,
TaxableToken
{
uint256 public constant initialSupply_ = 100_000_000_000 * 1 ether;
address private constant swapRouter_ = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
address[] private collectors_ = [0x17b1F15F038bF0A1F872fa64345204210Cd1a5e5];
uint256[] private shares_ = [10000];
mapping(address => bool) private _excludedFromAntiWhale;
event ExcludedFromAntiWhale(address indexed account, bool excluded);
constructor()
ERC20Base(
"DORK",
"DORK",
18)
AntiWhaleToken(initialSupply_ / 100) // 1% of supply
TaxableToken(
true,
initialSupply_ / 10000,
swapRouter_,
FeeConfiguration({
feesInToken: false,
buyFees: 200, //2%
sellFees: 200, //2%
transferFees: 0,
burnFeeRatio: 0,
liquidityFeeRatio: 0,
collectorsFeeRatio: 10000
})
)
TaxDistributor(collectors_, shares_)
{
_excludedFromAntiWhale[_msgSender()] = true;
_excludedFromAntiWhale[swapPair] = true;
_excludedFromAntiWhale[BURN_ADDRESS] = true;
_mint(_msgSender(), initialSupply_);
}
/**
* @dev Update the max token allowed per wallet.
* only callable by `owner()`
*/
function setMaxTokenPerWallet(uint256 amount) external onlyOwner {
_setMaxTokenPerWallet(amount);
}
/**
* @dev Update the pair token.
* only callable by `owner()`
*/
function setPairToken(address token) external onlyOwner {
swapPair = token;
}
/**
* @dev returns true if address is excluded from anti whale
*/
function isExcludedFromAntiWhale(address account) public view override returns (bool) {
return _excludedFromAntiWhale[account];
}
/**
* @dev Include/Exclude an address from anti whale
* only callable by `owner()`
*/
function setIsExcludedFromAntiWhale(address account, bool excluded) external onlyOwner {
_excludedFromAntiWhale[account] = excluded;
emit ExcludedFromAntiWhale(account, excluded);
}
/**
* @dev Destroys `amount` tokens from the caller.
* only callable by `owner()`
*/
function burn(uint256 amount) external override onlyOwner {
_burn(_msgSender(), amount);
}
/**
* @dev Destroys `amount` tokens from `account`, deducting from the caller's
* allowance.
* only callable by `owner()`
*/
function burnFrom(address account, uint256 amount) external override onlyOwner {
_burnFrom(account, amount);
}
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual override(ERC20, AntiWhaleToken) {
super._beforeTokenTransfer(from, to, amount);
}
/**
* @dev Enable/Disable autoProcessFees on transfer
* only callable by `owner()`
*/
function setAutoprocessFees(bool autoProcess) external override onlyOwner {
require(autoProcessFees != autoProcess, "Already set");
autoProcessFees = autoProcess;
}
/**
* @dev add a fee collector
* only callable by `owner()`
*/
function addFeeCollector(address account, uint256 share) external override onlyOwner {
_addFeeCollector(account, share);
}
/**
* @dev add/remove a LP
* only callable by `owner()`
*/
function setIsLpPool(address pairAddress, bool isLp) external override onlyOwner {
_setIsLpPool(pairAddress, isLp);
}
/**
* @dev add/remove an address to the tax exclusion list
* only callable by `owner()`
*/
function setIsExcludedFromFees(address account, bool excluded) external override onlyOwner {
_setIsExcludedFromFees(account, excluded);
}
/**
* @dev manually distribute fees to collectors
* only callable by `owner()`
*/
function distributeFees(uint256 amount, bool inToken) external override onlyOwner {
if (inToken) {
require(balanceOf(address(this)) >= amount, "Not enough balance");
} else {
require(address(this).balance >= amount, "Not enough balance");
}
_distributeFees(amount, inToken);
}
/**
* @dev process fees
* only callable by `owner()`
*/
function processFees(uint256 amount, uint256 minAmountOut) external override onlyOwner {
require(amount <= balanceOf(address(this)), "Amount too high");
_processFees(amount, minAmountOut);
}
/**
* @dev remove a fee collector
* only callable by `owner()`
*/
function removeFeeCollector(address account) external override onlyOwner {
_removeFeeCollector(account);
}
/**
* @dev set the liquidity owner
* only callable by `owner()`
*/
function setLiquidityOwner(address newOwner) external override onlyOwner {
liquidityOwner = newOwner;
}
/**
* @dev set the number of tokens to swap
* only callable by `owner()`
*/
function setNumTokensToSwap(uint256 amount) external override onlyOwner {
numTokensToSwap = amount;
}
/**
* @dev update a fee collector share
* only callable by `owner()`
*/
function updateFeeCollectorShare(address account, uint256 share) external override onlyOwner {
_updateFeeCollectorShare(account, share);
}
/**
* @dev update the fee configurations
* only callable by `owner()`
*/
function setFeeConfiguration(FeeConfiguration calldata configuration) external override onlyOwner {
_setFeeConfiguration(configuration);
}
/**
* @dev update the swap router
* only callable by `owner()`
*/
function setSwapRouter(address newRouter) external override onlyOwner {
_setSwapRouter(newRouter);
}
function _transfer(address from, address to, uint256 amount) internal override(ERC20, TaxableToken) {
super._transfer(from, to, amount);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "./ERC20Base.sol";
import "./TaxDistributor.sol";
/*
* TaxableToken: Add a tax on buy, sell or transfer
*/
abstract contract TaxableToken is ERC20Base, TaxDistributor {
struct FeeConfiguration {
bool feesInToken; // if set to true, collectors will get tokens, if false collector the fee will be swapped for the native currency
uint16 buyFees; // fees applied during buys, from 0 to 2000 (ie, 100 = 1%)
uint16 sellFees; // fees applied during sells, from 0 to 2000 (ie, 100 = 1%)
uint16 transferFees; // fees applied during transfers, from 0 to 2000 (ie, 100 = 1%)
uint16 burnFeeRatio; // from 0 to 10000 (ie 8000 = 80% of the fee collected are burned)
uint16 liquidityFeeRatio; // from 0 to 10000 (ie 8000 = 80% of the fee collected are added back to liquidity)
uint16 collectorsFeeRatio; // from 0 to 10000 (ie 8000 = 80% of the fee collected are sent to fee collectors)
}
address public constant BURN_ADDRESS = address(0x000000000000000000000000000000000000dEaD);
uint16 public constant MAX_FEE = 2000; // max 20% fees
uint16 public constant FEE_PRECISION = 10000;
// swap config
IUniswapV2Router02 public swapRouter;
address public swapPair;
address public liquidityOwner;
// fees
bool private _processingFees;
bool public autoProcessFees;
uint256 public numTokensToSwap; // amount of tokens to collect before processing fees (default to 0.05% of supply)
FeeConfiguration public feeConfiguration;
mapping(address => bool) private _excludedFromFees;
mapping(address => bool) private _lpPools;
event FeeConfigurationUpdated(FeeConfiguration configuration);
event SwapRouterUpdated(address indexed router, address indexed pair);
event ExcludedFromFees(address indexed account, bool excluded);
event SetLpPool(address indexed pairAddress, bool isLp);
modifier lockTheSwap() {
_processingFees = true;
_;
_processingFees = false;
}
constructor(
bool autoProcessFees_,
uint256 numTokensToSwap_,
address swapRouter_,
FeeConfiguration memory feeConfiguration_
) {
numTokensToSwap = numTokensToSwap_;
autoProcessFees = autoProcessFees_;
liquidityOwner = _msgSender();
// Create a uniswap pair for this new token
swapRouter = IUniswapV2Router02(swapRouter_);
swapPair = _pairFor(swapRouter.factory(), address(this), swapRouter.WETH());
_lpPools[swapPair] = true;
// configure addresses excluded from fee
_setIsExcludedFromFees(_msgSender(), true);
_setIsExcludedFromFees(address(this), true);
// configure fees
_setFeeConfiguration(feeConfiguration_);
}
// receive ETH when swaping
receive() external payable {}
function isExcludedFromFees(address account) public view returns (bool) {
return _excludedFromFees[account];
}
function _setIsExcludedFromFees(address account, bool excluded) internal {
require(_excludedFromFees[account] != excluded, "Already set");
_excludedFromFees[account] = excluded;
emit ExcludedFromFees(account, excluded);
}
function _setIsLpPool(address pairAddress, bool isLp) internal {
require(_lpPools[pairAddress] != isLp, "Already set");
_lpPools[pairAddress] = isLp;
emit SetLpPool(pairAddress, isLp);
}
function isLpPool(address pairAddress) public view returns (bool) {
return _lpPools[pairAddress];
}
function _setSwapRouter(address _newRouter) internal {
require(_newRouter != address(0), "Invalid router");
swapRouter = IUniswapV2Router02(_newRouter);
IUniswapV2Factory factory = IUniswapV2Factory(swapRouter.factory());
require(address(factory) != address(0), "Invalid factory");
address weth = swapRouter.WETH();
swapPair = factory.getPair(address(this), weth);
if (swapPair == address(0)) {
swapPair = factory.createPair(address(this), weth);
}
require(swapPair != address(0), "Invalid pair address.");
emit SwapRouterUpdated(address(swapRouter), swapPair);
}
function _setFeeConfiguration(FeeConfiguration memory configuration) internal {
require(configuration.buyFees <= MAX_FEE, "Invalid buy fee");
require(configuration.sellFees <= MAX_FEE, "Invalid sell fee");
require(configuration.transferFees <= MAX_FEE, "Invalid transfer fee");
uint16 totalShare = configuration.burnFeeRatio +
configuration.liquidityFeeRatio +
configuration.collectorsFeeRatio;
require(totalShare == 0 || totalShare == FEE_PRECISION, "Invalid fee share");
feeConfiguration = configuration;
emit FeeConfigurationUpdated(configuration);
}
function _processFees(uint256 tokenAmount, uint256 minAmountOut) internal lockTheSwap {
uint256 contractTokenBalance = balanceOf(address(this));
if (contractTokenBalance >= tokenAmount) {
uint256 liquidityAmount = (tokenAmount * feeConfiguration.liquidityFeeRatio) /
(FEE_PRECISION - feeConfiguration.burnFeeRatio);
uint256 liquidityTokens = liquidityAmount / 2;
uint256 collectorsAmount = tokenAmount - liquidityAmount;
uint256 liquifyAmount = liquidityAmount - liquidityTokens;
if (!feeConfiguration.feesInToken) {
liquifyAmount += collectorsAmount;
}
// swap tokens
if (liquifyAmount > 0) {
if (balanceOf(swapPair) == 0) {
// do not swap before the pair has liquidity
return;
}
// capture the contract's current balance.
uint256 initialBalance = address(this).balance;
_swapTokensForEth(liquifyAmount, minAmountOut);
// how much did we just swap into?
uint256 swapBalance = address(this).balance - initialBalance;
// add liquidity
uint256 liquidityETH = (swapBalance * liquidityTokens) / liquifyAmount;
if (liquidityETH > 0) {
_addLiquidity(liquidityTokens, liquidityETH);
}
}
if (feeConfiguration.feesInToken) {
// send tokens to fee collectors
_distributeFees(collectorsAmount, true);
} else {
// send remaining ETH to fee collectors
_distributeFees(address(this).balance, false);
}
}
}
/// @dev Swap tokens for eth
function _swapTokensForEth(uint256 tokenAmount, uint256 minAmountOut) private {
// generate the swap pair path of token -> weth
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = swapRouter.WETH();
_approve(address(this), address(swapRouter), tokenAmount);
// make the swap
swapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
minAmountOut,
path,
address(this),
block.timestamp
);
}
/// @dev Add liquidity
function _addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(swapRouter), tokenAmount);
// add the liquidity
swapRouter.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
liquidityOwner,
block.timestamp
);
}
// calculates the CREATE2 address for a pair without making any external calls
function _pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
(address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
pair = address(
uint160(
uint(
keccak256(
abi.encodePacked(
hex"ff",
factory,
keccak256(abi.encodePacked(token0, token1)),
hex"96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f" // init code hash
)
)
)
)
);
}
function _transfer(address from, address to, uint256 amount) internal virtual override {
require(amount > 0, "Transfer <= 0");
uint256 taxFee = 0;
bool processFee = !_processingFees && autoProcessFees;
if (!_processingFees) {
bool fromExcluded = isExcludedFromFees(from);
bool toExcluded = isExcludedFromFees(to);
bool fromLP = isLpPool(from);
bool toLP = isLpPool(to);
if (fromLP && !toLP && !toExcluded && to != address(swapRouter)) {
// buy fee
taxFee = feeConfiguration.buyFees;
} else if (toLP && !fromExcluded && !toExcluded) {
// sell fee
taxFee = feeConfiguration.sellFees;
} else if (!fromLP && !toLP && from != address(swapRouter) && !fromExcluded) {
// transfer fee
taxFee = feeConfiguration.transferFees;
}
}
// process fees
if (processFee && taxFee > 0 && !_lpPools[from]) {
uint256 contractTokenBalance = balanceOf(address(this));
if (contractTokenBalance >= numTokensToSwap) {
_processFees(numTokensToSwap, 0);
}
}
if (taxFee > 0) {
uint256 taxAmount = (amount * taxFee) / FEE_PRECISION;
uint256 sendAmount = amount - taxAmount;
uint256 burnAmount = (taxAmount * feeConfiguration.burnFeeRatio) / FEE_PRECISION;
if (burnAmount > 0) {
taxAmount -= burnAmount;
super._transfer(from, BURN_ADDRESS, burnAmount);
}
if (taxAmount > 0) {
super._transfer(from, address(this), taxAmount);
}
if (sendAmount > 0) {
super._transfer(from, to, sendAmount);
}
} else {
super._transfer(from, to, amount);
}
}
function setAutoprocessFees(bool autoProcess) external virtual;
function setIsLpPool(address pairAddress, bool isLp) external virtual;
function setIsExcludedFromFees(address account, bool excluded) external virtual;
function processFees(uint256 amount, uint256 minAmountOut) external virtual;
function setLiquidityOwner(address newOwner) external virtual;
function setNumTokensToSwap(uint256 amount) external virtual;
function setFeeConfiguration(FeeConfiguration calldata configuration) external virtual;
function setSwapRouter(address newRouter) external virtual;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/utils/Context.sol";
import "./ERC20Base.sol";
/**
* @dev Extension of {ERC20} that allows token holders to destroy both their own
* tokens and those that they have an allowance for, in a way that can be
* recognized off-chain (via event analysis).
*/
abstract contract ERC20Burnable is Context, ERC20Base {
/**
* @dev Destroys `amount` tokens from the caller.
*
* See {ERC20-_burn}.
*/
function burn(uint256 amount) external virtual {
_burn(_msgSender(), amount);
}
/**
* @dev Destroys `amount` tokens from `account`, deducting from the caller's
* allowance.
*
* See {ERC20-_burn} and {ERC20-allowance}.
*
* Requirements:
*
* - the caller must have allowance for ``accounts``'s tokens of at least
* `amount`.
*/
function _burnFrom(address account, uint256 amount) internal virtual {
uint256 currentAllowance = allowance(account, _msgSender());
require(currentAllowance >= amount, "ERC20Burnable: burn amount exceeds allowance");
unchecked {
_approve(account, _msgSender(), currentAllowance - amount);
}
_burn(account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, deducting from the caller's
* allowance.
*/
function burnFrom(address account, uint256 amount) external virtual {
_burnFrom(account, amount);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
abstract contract ERC20Base is ERC20 {
uint8 private immutable _decimals;
uint256 public immutable TOKEN_CODE;
constructor(
string memory name_,
string memory symbol_,
uint8 decimals_
) ERC20(name_, symbol_) {
_decimals = decimals_;
}
function decimals() public view override returns (uint8) {
return _decimals;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./ERC20Base.sol";
/*
* AntiWhaleToken: Limit the max wallet size
*/
abstract contract AntiWhaleToken is ERC20Base {
uint256 public maxTokenPerWallet; // anti whale: max token per wallet (default to 1% of supply)
event MaxTokenPerWalletUpdated(uint256 amount);
modifier antiWhale(
address sender,
address recipient,
uint256 amount
) {
if (maxTokenPerWallet != 0 && !isExcludedFromAntiWhale(recipient)) {
require(balanceOf(recipient) + amount <= maxTokenPerWallet, "Wallet exceeds max");
}
_;
}
constructor(uint256 maxTokenPerWallet_) {
maxTokenPerWallet = maxTokenPerWallet_;
}
function isExcludedFromAntiWhale(address account) public view virtual returns (bool);
/**
* @dev Update the max token per wallet
* set to 0 to disable
*/
function _setMaxTokenPerWallet(uint256 amount) internal {
require(amount == 0 || amount > (totalSupply() * 5) / 1000, "Amount too low"); // min 0.5% of supply
maxTokenPerWallet = amount;
emit MaxTokenPerWalletUpdated(amount);
}
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual override antiWhale(from, to, amount) {
super._beforeTokenTransfer(from, to, amount);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 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 {
_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
pragma solidity ^0.8.17;
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "./ERC20Base.sol";
abstract contract TaxDistributor is ERC20Base {
using EnumerableSet for EnumerableSet.AddressSet;
EnumerableSet.AddressSet private _collectors;
mapping(address => uint256) private _shares;
uint256 public totalFeeCollectorsShares;
event FeeCollectorAdded(address indexed account, uint256 share);
event FeeCollectorUpdated(address indexed account, uint256 oldShare, uint256 newShare);
event FeeCollectorRemoved(address indexed account);
event FeeCollected(address indexed receiver, uint256 amount);
constructor(address[] memory collectors_, uint256[] memory shares_) {
require(collectors_.length == shares_.length, "Invalid fee collectors");
for (uint256 i = 0; i < collectors_.length; i++) {
_addFeeCollector(collectors_[i], shares_[i]);
}
}
function isFeeCollector(address account) public view returns (bool) {
return _collectors.contains(account);
}
function feeCollectorShare(address account) public view returns (uint256) {
return _shares[account];
}
function _addFeeCollector(address account, uint256 share) internal {
require(!_collectors.contains(account), "Already fee collector");
require(share > 0, "Invalid share");
_collectors.add(account);
_shares[account] = share;
totalFeeCollectorsShares += share;
emit FeeCollectorAdded(account, share);
}
function _removeFeeCollector(address account) internal {
require(_collectors.contains(account), "Not fee collector");
_collectors.remove(account);
totalFeeCollectorsShares -= _shares[account];
delete _shares[account];
emit FeeCollectorRemoved(account);
}
function _updateFeeCollectorShare(address account, uint256 share) internal {
require(_collectors.contains(account), "Not fee collector");
require(share > 0, "Invalid share");
uint256 oldShare = _shares[account];
totalFeeCollectorsShares -= oldShare;
_shares[account] = share;
totalFeeCollectorsShares += share;
emit FeeCollectorUpdated(account, oldShare, share);
}
function _distributeFees(uint256 amount, bool inToken) internal returns (bool) {
if (amount == 0) return false;
if (totalFeeCollectorsShares == 0) return false;
uint256 distributed = 0;
uint256 len = _collectors.length();
for (uint256 i = 0; i < len; i++) {
address collector = _collectors.at(i);
uint256 share = i == len - 1
? amount - distributed
: (amount * _shares[collector]) / totalFeeCollectorsShares;
if (inToken) {
_transfer(address(this), collector, share);
} else {
payable(collector).transfer(share);
}
emit FeeCollected(collector, share);
distributed += share;
}
return true;
}
function addFeeCollector(address account, uint256 share) external virtual;
function removeFeeCollector(address account) external virtual;
function updateFeeCollectorShare(address account, uint256 share) external virtual;
function distributeFees(uint256 amount, bool inToken) external virtual;
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2;
import './IUniswapV2Router01.sol';
interface IUniswapV2Router02 is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
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(uint) external view returns (address pair);
function allPairsLength() external view returns (uint);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Context.sol)
pragma solidity ^0.8.20;
/**
* @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 (last updated v4.8.0) (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].
*
* 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}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* 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 value {ERC20} uses, unless this function is
* 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 (last updated v5.0.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.
pragma solidity ^0.8.20;
/**
* @dev Library for managing
* https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
* types.
*
* Sets have the following properties:
*
* - Elements are added, removed, and checked for existence in constant time
* (O(1)).
* - Elements are enumerated in O(n). No guarantees are made on the ordering.
*
* ```solidity
* contract Example {
* // Add the library methods
* using EnumerableSet for EnumerableSet.AddressSet;
*
* // Declare a set state variable
* EnumerableSet.AddressSet private mySet;
* }
* ```
*
* As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
* and `uint256` (`UintSet`) are supported.
*
* [WARNING]
* ====
* Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
* unusable.
* See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
*
* In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
* array of EnumerableSet.
* ====
*/
library EnumerableSet {
// To implement this library for multiple types with as little code
// repetition as possible, we write it in terms of a generic Set type with
// bytes32 values.
// The Set implementation uses private functions, and user-facing
// implementations (such as AddressSet) are just wrappers around the
// underlying Set.
// This means that we can only create new EnumerableSets for types that fit
// in bytes32.
struct Set {
// Storage of set values
bytes32[] _values;
// Position is the index of the value in the `values` array plus 1.
// Position 0 is used to mean a value is not in the set.
mapping(bytes32 value => uint256) _positions;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function _add(Set storage set, bytes32 value) private returns (bool) {
if (!_contains(set, value)) {
set._values.push(value);
// The value is stored at length-1, but we add 1 to all indexes
// and use 0 as a sentinel value
set._positions[value] = set._values.length;
return true;
} else {
return false;
}
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function _remove(Set storage set, bytes32 value) private returns (bool) {
// We cache the value's position to prevent multiple reads from the same storage slot
uint256 position = set._positions[value];
if (position != 0) {
// Equivalent to contains(set, value)
// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
// the array, and then remove the last element (sometimes called as 'swap and pop').
// This modifies the order of the array, as noted in {at}.
uint256 valueIndex = position - 1;
uint256 lastIndex = set._values.length - 1;
if (valueIndex != lastIndex) {
bytes32 lastValue = set._values[lastIndex];
// Move the lastValue to the index where the value to delete is
set._values[valueIndex] = lastValue;
// Update the tracked position of the lastValue (that was just moved)
set._positions[lastValue] = position;
}
// Delete the slot where the moved value was stored
set._values.pop();
// Delete the tracked position for the deleted slot
delete set._positions[value];
return true;
} else {
return false;
}
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function _contains(Set storage set, bytes32 value) private view returns (bool) {
return set._positions[value] != 0;
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function _length(Set storage set) private view returns (uint256) {
return set._values.length;
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function _at(Set storage set, uint256 index) private view returns (bytes32) {
return set._values[index];
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function _values(Set storage set) private view returns (bytes32[] memory) {
return set._values;
}
// Bytes32Set
struct Bytes32Set {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
return _add(set._inner, value);
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
return _remove(set._inner, value);
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
return _contains(set._inner, value);
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(Bytes32Set storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
return _at(set._inner, index);
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
bytes32[] memory store = _values(set._inner);
bytes32[] memory result;
/// @solidity memory-safe-assembly
assembly {
result := store
}
return result;
}
// AddressSet
struct AddressSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(AddressSet storage set, address value) internal returns (bool) {
return _add(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(AddressSet storage set, address value) internal returns (bool) {
return _remove(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(AddressSet storage set, address value) internal view returns (bool) {
return _contains(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(AddressSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(AddressSet storage set, uint256 index) internal view returns (address) {
return address(uint160(uint256(_at(set._inner, index))));
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(AddressSet storage set) internal view returns (address[] memory) {
bytes32[] memory store = _values(set._inner);
address[] memory result;
/// @solidity memory-safe-assembly
assembly {
result := store
}
return result;
}
// UintSet
struct UintSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(UintSet storage set, uint256 value) internal returns (bool) {
return _add(set._inner, bytes32(value));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(UintSet storage set, uint256 value) internal returns (bool) {
return _remove(set._inner, bytes32(value));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(UintSet storage set, uint256 value) internal view returns (bool) {
return _contains(set._inner, bytes32(value));
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(UintSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(UintSet storage set, uint256 index) internal view returns (uint256) {
return uint256(_at(set._inner, index));
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(UintSet storage set) internal view returns (uint256[] memory) {
bytes32[] memory store = _values(set._inner);
uint256[] memory result;
/// @solidity memory-safe-assembly
assembly {
result := store
}
return result;
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2;
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB);
function removeLiquidityETH(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountToken, uint amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountETH);
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.20;
import {IERC20} from "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*/
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 v5.0.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.20;
/**
* @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 value of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the value of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the
* allowance mechanism. `value` 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 value) external returns (bool);
}