Contract Source Code:
/*
/$$$$$$$ /$$ /$$ /$$$$$$$ /$$$$$$ /$$$$$$$$ /$$$$$$$$ /$$ /$$
| $$__ $$| $$ | $$| $$__ $$ /$$__ $$ | $$_____/|__ $$__/| $$ | $$
| $$ \ $$| $$ | $$| $$ \ $$| $$ \__/ /$$$$$$ /$$$$$$$ | $$ | $$ | $$ | $$
| $$$$$$$/| $$ | $$| $$$$$$$/| $$$$$$ /$$__ $$| $$__ $$| $$$$$ | $$ | $$$$$$$$
| $$____/ | $$ | $$| $$____/ \____ $$| $$ \ $$| $$ \ $$| $$__/ | $$ | $$__ $$
| $$ | $$ | $$| $$ /$$ \ $$| $$ | $$| $$ | $$| $$ | $$ | $$ | $$
| $$ | $$$$$$/| $$ | $$$$$$/| $$$$$$/| $$ | $$| $$$$$$$$ | $$ | $$ | $$
|__/ \______/ |__/ \______/ \______/ |__/ |__/|________/ |__/ |__/ |__/
Website: https://PUPSonETH.com/
Twitter: https://twitter.com/PUPSonETH
Telegram: https://t.me/PUPSonETH
*/
// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {ERC20Burnable} from "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {IUniswapV2Router} from "./interfaces/IUniswapV2Router.sol";
import {IUniswapV2Factory} from "./interfaces/IUniswapV2Factory.sol";
contract PUPSonETH is ERC20, ERC20Burnable, Ownable {
address public marketingWallet;
uint16 public buyFee = 0;
uint16 public sellFee = 0;
uint256 public swapTokensAtAmount = 50_000 * 1e18; // 0.05% of TS
bool private _distributingFees;
mapping(address => bool) private _excludedFromFees;
bool public limitsInEffect = true;
uint256 public maxWalletBalance = 2_000_000 * 1e18; // 2% of TS
mapping(address => bool) private _excludedFromMaxWalletBalance;
address public immutable uniV2Pair;
IUniswapV2Router public constant uniV2Router = IUniswapV2Router(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
bool public tradingEnabled;
event LimitsRemoved();
event TradingEnabled();
event BuyFeeSet(uint16 newBuyFee);
event SellFeeSet(uint16 newSellFee);
event MarketingWalletUpdated(address newAddress);
event SwapTokensAtAmountSet(uint256 newSwapTokensAtAmount);
event FeesDistributed(uint256 totalTokensDistributed);
/**
* @notice Constructor function for the PUPSonETH contract.
* It initializes the contract by setting the token name and symbol,
* creates a Uniswap V2 pair for the token, sets initial values for marketing and operations wallets and
* mints total token supply.
* It also approves the Uniswap V2 router to spend an unlimited amount of tokens on behalf of the contract.
*/
constructor() ERC20("PUPSonETH", "PUPS") {
uniV2Pair = IUniswapV2Factory(uniV2Router.factory()).createPair(address(this), uniV2Router.WETH());
_excludedFromMaxWalletBalance[uniV2Pair] = true;
_excludedFromFees[owner()] = true;
marketingWallet = owner();
_mint(owner(), 100_000_000 * 1e18);
_approve(address(this), address(uniV2Router), type(uint256).max);
}
receive() external payable {}
/**
* @notice This function is used to transfer tokens internally within the contract.
* It performs various checks such as trading enablement, maximum transaction and balance limits,
* fee distribution, and fee deduction.
* It then calls the _transfer function from the parent contract to perform the actual token transfer.
* @param from The address to transfer tokens from.
* @param to The address to transfer tokens to.
* @param amount The amount of tokens to transfer.
*/
function _transfer(address from, address to, uint256 amount) internal override {
require(amount > 0, "PUPSonETH: transfer amount must be greater than 0");
// Check if trading has been enabled
if (!tradingEnabled) {
require(from == owner() || to == owner(), "PUPSonETH: trading has not been enabled yet");
}
// Max TX and Max Balance Limits
if (limitsInEffect) {
if (from != owner() && to != owner() && to != address(0) && to != address(0xdead) && !_distributingFees) {
// On Buys
if (from == uniV2Pair && !_excludedFromMaxWalletBalance[to]) {
require(
amount + balanceOf(to) <= maxWalletBalance, "PUPSonETH: balance would exceed max wallet balance"
);
}
// On Transfers to non-excluded "to" address
else if (!_excludedFromMaxWalletBalance[to]) {
require(
amount + balanceOf(to) <= maxWalletBalance, "PUPSonETH: balance would exceed max wallet balance"
);
}
}
}
// Swap any tokens held as fees for ETH and distribute
bool shouldSwap = balanceOf(address(this)) >= swapTokensAtAmount;
if (shouldSwap && !_distributingFees && from != uniV2Pair && !_excludedFromFees[from] && !_excludedFromFees[to])
{
_distributingFees = true;
_distributeFees();
_distributingFees = false;
}
// Determine if we should take fees
bool takeFees = !_distributingFees;
if (_excludedFromFees[from] || _excludedFromFees[to]) {
takeFees = false;
}
uint256 fees = 0;
// Take Fees if necessary
if (takeFees) {
// Fees on buys
if (from == uniV2Pair && buyFee > 0) {
fees = (amount * buyFee) / 1_000;
}
// Fees on sells
else if (to == uniV2Pair && sellFee > 0) {
fees = (amount * sellFee) / 1_000;
}
// If there are fees to be taken, transfer and substract from amount
if (fees > 0) {
super._transfer(from, address(this), fees);
amount -= fees;
}
}
// Make final transfer
super._transfer(from, to, amount);
}
/**
* @notice Distributes fees collected by the contract.
* The function calculates the amount of fees to distribute based on the
* balance of the contract and a max threshold of 20 times the swapTokensAtAmount.
* @dev Emits a `FeesDistributed` event with the amount distributed.
*/
function _distributeFees() private {
// Determine amount of held fees to distribute
uint256 tokensToDistribute = balanceOf(address(this));
if (tokensToDistribute > swapTokensAtAmount * 20) {
tokensToDistribute = swapTokensAtAmount * 20;
}
// Swap tokens for ETH
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniV2Router.WETH();
try uniV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokensToDistribute, 0, path, address(this), block.timestamp
) {} catch {}
// Send ETH to Marketing
uint256 ethBalance = address(this).balance;
if (ethBalance > 0) {
(bool success,) = marketingWallet.call{value: ethBalance}("");
if (success) {
emit FeesDistributed(tokensToDistribute);
}
}
}
/**
* @notice Returns whether the specified account is excluded from fees.
* @param account The address to check.
* @return A boolean indicating whether the account is excluded from fees.
*/
function isExcludedFromFees(address account) public view returns (bool) {
return _excludedFromFees[account];
}
/**
* @notice Returns whether the specified account is excluded from the maximum wallet balance limit.
* @param account The address to check.
* @return A boolean indicating whether the account is excluded from the maximum wallet balance limit.
*/
function isExcludedFromMaxWalletBalance(address account) public view returns (bool) {
return _excludedFromMaxWalletBalance[account];
}
/**
* @notice Enables trading of the token.
* @dev Can only be called by the contract owner.
* @dev Emits a `TradingEnabled` event.
*/
function enableTrading() external onlyOwner {
tradingEnabled = true;
emit TradingEnabled();
}
/**
* @notice Updates the marketing wallet address.
* @param newAddress The new address for the marketing wallet.
* @dev Can only be called by the contract owner.
* @dev `newAddress` cannot be the zero address.
* @dev Emits a `MarketingWalletUpdated` event.
*/
function updateMarketingWallet(address newAddress) external onlyOwner {
require(newAddress != address(0), "PUPSonETH: address cannot be 0 address");
marketingWallet = newAddress;
emit MarketingWalletUpdated(newAddress);
}
/**
* @notice Removes the max transcation and max wallet balance limits on the token.
* @dev Can only be called by the contract owner.
* @dev Once turned off, the limits cannot be turned back on.
* @dev Emits a `LimitsRemoved` event.
*/
function removeLimits() external onlyOwner {
limitsInEffect = false;
emit LimitsRemoved();
}
/**
* @notice Sets the amount of tokens required for a fee tokens swap.
* @param newSwapTokensAtAmount The new amount of tokens required for a swap.
* @dev Can only be called by the contract owner.
* @dev The newSwapTokensAtAmount must be greater than or equal to 0.001% of the total supply,
* and less than or equal to 0.5% of the total supply.
* @dev Emits a `SwapTokensAtAmountSet` event.
*/
function setSwapTokensAtAmount(uint256 newSwapTokensAtAmount) external onlyOwner {
require(
newSwapTokensAtAmount >= totalSupply() / 100_000,
"PUPSonETH: swap tokens at amount cannot be lower than 0.001% of total supply"
);
require(
newSwapTokensAtAmount <= (totalSupply() * 5) / 1_000,
"PUPSonETH: swap tokens at amount cannot be higher than 0.5% of total supply"
);
swapTokensAtAmount = newSwapTokensAtAmount;
emit SwapTokensAtAmountSet(newSwapTokensAtAmount);
}
/**
* @notice Sets the buy fee for PUPSonETH.
* @param newBuyFee The new buy fee to be set.
* @dev Can only be called by the contract owner.
* @dev The new buy fee cannot be greater than 400 (40%).
* @dev Emits a `BuyFeeSet` event.
*/
function setBuyFee(uint16 newBuyFee) external onlyOwner {
require(newBuyFee <= 400, "PUPSonETH: fee cannot be greater than 40%");
buyFee = newBuyFee;
emit BuyFeeSet(newBuyFee);
}
/**
* @notice Sets the sell fee for PUPSonETH.
* @param newSellFee The new sell fee to be set.
* @dev Can only be called by the contract owner.
* @dev The new sell fee cannot be greater than 400 (40%).
* @dev Emits a `SellFeeSet` event.
*/
function setSellFee(uint16 newSellFee) external onlyOwner {
require(newSellFee <= 400, "PUPSonETH: fee cannot be greater than 40%");
sellFee = newSellFee;
emit SellFeeSet(newSellFee);
}
/**
* @notice Sets the excluded status of an account from fees.
* @param account The address of the account.
* @param excluded The excluded status to be set.
* @dev Only the contract owner can call this function.
*/
function setExcludedFromFees(address account, bool excluded) external onlyOwner {
_excludedFromFees[account] = excluded;
}
/**
* @notice Sets whether an account is excluded from the maximum wallet balance limit.
* @param account The address of the account to be excluded or included.
* @param excluded A boolean indicating whether the account should be excluded or included.
* @dev Only the contract owner can call this function.
*/
function setExcludedFromMaxWalletBalance(address account, bool excluded) external onlyOwner {
_excludedFromMaxWalletBalance[account] = excluded;
}
}
// 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 (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)
pragma solidity ^0.8.0;
import "../ERC20.sol";
import "../../../utils/Context.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, ERC20 {
/**
* @dev Destroys `amount` tokens from the caller.
*
* See {ERC20-_burn}.
*/
function burn(uint256 amount) public 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) public virtual {
_spendAllowance(account, _msgSender(), amount);
_burn(account, amount);
}
}
// 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
pragma solidity 0.8.23;
interface IUniswapV2Router {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function getAmountsIn(uint256 amountOut, address[] calldata path)
external
view
returns (uint256[] memory amounts);
function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
function swapExactTokensForETH(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactTokensForETHSupportingFeeOnTransferTokens(
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;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;
interface IUniswapV2Factory {
function getPair(address tokenA, address tokenB) external view returns (address pair);
function createPair(address tokenA, address tokenB) external returns (address pair);
}
// 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 (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 v4.9.4) (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;
}
function _contextSuffixLength() internal view virtual returns (uint256) {
return 0;
}
}