文件 1 的 1：PiggyBankToken.sol
pragma solidity 0.8.15;
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount)
external
returns (bool);
function allowance(address owner, address spender)
external
view
returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(
address indexed owner,
address indexed spender,
uint256 value
);
}
interface IFactory {
function createPair(address tokenA, address tokenB)
external
returns (address pair);
function getPair(address tokenA, address tokenB)
external
view
returns (address pair);
}
interface IRouter {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
)
external
payable
returns (
uint256 amountToken,
uint256 amountETH,
uint256 liquidity
);
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;
}
interface IERC20Metadata is IERC20 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
}
library Address {
function isContract(address account) internal view returns (bool) {
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
function sendValue(address payable recipient, uint256 amount) internal {
require(
address(this).balance >= amount,
"Address: insufficient balance"
);
(bool success, ) = recipient.call{value: amount}("");
require(
success,
"Address: unable to send value, recipient may have reverted"
);
}
function functionCall(address target, bytes memory data)
internal
returns (bytes memory)
{
return functionCall(target, data, "Address: low-level call failed");
}
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return
functionCallWithValue(
target,
data,
value,
"Address: low-level call with value failed"
);
}
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(
address(this).balance >= value,
"Address: insufficient balance for call"
);
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(
data
);
return _verifyCallResult(success, returndata, errorMessage);
}
function functionStaticCall(address target, bytes memory data)
internal
view
returns (bytes memory)
{
return
functionStaticCall(
target,
data,
"Address: low-level static call failed"
);
}
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function functionDelegateCall(address target, bytes memory data)
internal
returns (bytes memory)
{
return
functionDelegateCall(
target,
data,
"Address: low-level delegate call failed"
);
}
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) private pure returns (bytes memory) {
if (success) {
return returndata;
} else {
if (returndata.length > 0) {
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
this;
return msg.data;
}
}
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor () {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
function owner() public view returns (address) {
return _owner;
}
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
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;
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
function decimals() public view virtual override returns (uint8) {
return 18;
}
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, spender, amount);
return true;
}
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;
}
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + addedValue);
return true;
}
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;
}
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;
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
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 {
_balances[account] += amount;
}
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
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;
_totalSupply -= amount;
}
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
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);
}
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);
}
}
}
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
contract PiggyBankToken is Ownable, ERC20 {
IRouter public uniswapV2Router;
address public immutable uniswapV2Pair;
string private constant _name = "Piggy Bank Token";
string private constant _symbol = "PiggyBank";
uint8 private constant _decimals = 18;
bool public isTradingEnabled;
uint256 constant initialSupply = 1000000000000 * (10**18);
uint256 public maxWalletAmount = initialSupply * 2 / 100;
bool private _swapping;
uint256 public minimumTokensBeforeSwap = initialSupply * 25 / 100000;
address public walletA;
uint8 public walletAFeeOnBuy;
uint8 public walletAFeeOnSell = 15;
uint256 private _launchBlockNumber;
bool public launchTokensClaimed;
uint256 public launchTokens;
mapping (address => bool) private _isExcludedFromMaxWalletLimit;
mapping (address => bool) private _isAllowedToTradeWhenDisabled;
mapping (address => bool) private _isExcludedFromFee;
mapping (address => bool) public automatedMarketMakerPairs;
uint8 private _walletAFee;
event AutomatedMarketMakerPairChange(address indexed pair, bool indexed value);
event UniswapV2RouterChange(address indexed newAddress, address indexed oldAddress);
event WalletChange(string indexed indentifier, address indexed newWallet, address indexed oldWallet);
event FeeChange(string indexed identifier, uint8 newWalletAFee, uint8 oldWalletFee);
event AllowedWhenTradingDisabledChange(address indexed account, bool isExcluded);
event MaxWalletAmountChange(uint256 indexed newValue, uint256 indexed oldValue);
event ExcludeFromMaxWalletChange(address indexed account, bool isExcluded);
event MinTokenAmountBeforeSwapChange(uint256 indexed newValue, uint256 indexed oldValue);
event Swap(uint256 tokensSwapped, uint256 ethReceived);
event ClaimOverflow(address token, uint256 amount);
event FeesApplied(uint8 walletAFee);
event Sent(uint256 balance, uint256 initialETHBalance, uint256 currentBalance, uint256 ETHBalanceAfterSwap);
constructor() ERC20(_name, _symbol) {
walletA = owner();
IRouter _uniswapV2Router = IRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
address _uniswapV2Pair = IFactory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
uniswapV2Router = _uniswapV2Router;
uniswapV2Pair = _uniswapV2Pair;
_setAutomatedMarketMakerPair(_uniswapV2Pair, true);
_isExcludedFromFee[owner()] = true;
_isExcludedFromFee[address(this)] = true;
_isAllowedToTradeWhenDisabled[owner()] = true;
_isAllowedToTradeWhenDisabled[address(this)] = true;
_isExcludedFromMaxWalletLimit[_uniswapV2Pair] = true;
_isExcludedFromMaxWalletLimit[address(uniswapV2Router)] = true;
_isExcludedFromMaxWalletLimit[address(this)] = true;
_isExcludedFromMaxWalletLimit[owner()] = true;
_mint(owner(), initialSupply);
}
receive() external payable {}
function activateTrading() external onlyOwner {
isTradingEnabled = true;
if (_launchBlockNumber == 0) {
_launchBlockNumber = block.number;
}
}
function deactivateTrading() external onlyOwner {
isTradingEnabled = false;
}
function _setAutomatedMarketMakerPair(address pair, bool value) private {
require(automatedMarketMakerPairs[pair] != value, "PiggyBank: Automated market maker pair is already set to that value");
automatedMarketMakerPairs[pair] = value;
emit AutomatedMarketMakerPairChange(pair, value);
}
function allowTradingWhenDisabled(address account, bool allowed) external onlyOwner {
_isAllowedToTradeWhenDisabled[account] = allowed;
emit AllowedWhenTradingDisabledChange(account, allowed);
}
function excludeFromMaxWalletLimit(address account, bool excluded) external onlyOwner {
require(_isExcludedFromMaxWalletLimit[account] != excluded, "PiggyBank: Account is already the value of 'excluded'");
_isExcludedFromMaxWalletLimit[account] = excluded;
emit ExcludeFromMaxWalletChange(account, excluded);
}
function setWallets(address newWalletA) external onlyOwner {
require(newWalletA != address(0), "PiggyBank: The walletA cannot be 0");
emit WalletChange('walletA', newWalletA, walletA);
walletA = newWalletA;
}
function setBaseFeeOnBuy(uint8 newWalletAFeeOnBuy) external onlyOwner {
emit FeeChange('baseFee-Buy', newWalletAFeeOnBuy, walletAFeeOnBuy);
walletAFeeOnBuy = newWalletAFeeOnBuy;
}
function setBaseFeesOnSell(uint8 newWalletAFeeOnSell) external onlyOwner {
emit FeeChange('baseFee-Sell', newWalletAFeeOnSell, walletAFeeOnSell);
walletAFeeOnSell = newWalletAFeeOnSell;
}
function setUniswapRouter(address newAddress) external onlyOwner {
require(newAddress != address(uniswapV2Router), "PiggyBank: The router already has that address");
emit UniswapV2RouterChange(newAddress, address(uniswapV2Router));
uniswapV2Router = IRouter(newAddress);
}
function setMinimumTokensBeforeSwap(uint256 newValue) external onlyOwner {
require(newValue != minimumTokensBeforeSwap, "PiggyBank: Cannot update minimumTokensBeforeSwap to same value");
emit MinTokenAmountBeforeSwapChange(newValue, minimumTokensBeforeSwap);
minimumTokensBeforeSwap = newValue;
}
function setMaxWalletAmount(uint256 newValue) external onlyOwner {
require(newValue != maxWalletAmount, "PiggyBank: Cannot update maxWalletAmount to same value");
require(newValue >= initialSupply * 5 / 1000, "PiggyBank: Cannot update maxWalletAmount to value less than 0.5% of supply");
emit MaxWalletAmountChange(newValue, maxWalletAmount);
maxWalletAmount = newValue;
}
function claimLaunchTokens() external onlyOwner {
require(!launchTokensClaimed, "PiggyBank: Launch tokens have already been claimed");
require(block.number - _launchBlockNumber > 7, "PiggyBank: Only claim launch tokens after launch");
launchTokensClaimed = true;
require(launchTokens <= balanceOf(address(this)), "PiggyBank: A swap has already occurred");
uint256 amount = launchTokens;
launchTokens = 0;
(bool success) = IERC20(address(this)).transfer(owner(), amount);
if (success){
emit ClaimOverflow(address(this), amount);
}
}
function claimETHOverflow(uint256 amount) external onlyOwner {
require(amount < address(this).balance, "PiggyBank: Cannot send more than contract balance");
(bool success,) = address(owner()).call{value : amount}("");
if (success){
emit ClaimOverflow(uniswapV2Router.WETH(), amount);
}
}
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");
if(amount == 0) {
super._transfer(from, to, 0);
return;
}
if(!_isAllowedToTradeWhenDisabled[from] && !_isAllowedToTradeWhenDisabled[to]) {
require(isTradingEnabled, "PiggyBank: Trading is currently disabled.");
if (!_isExcludedFromMaxWalletLimit[to]) {
require((balanceOf(to) + amount) <= maxWalletAmount, "PiggyBank: Expected wallet amount exceeds the maxWalletAmount.");
}
}
if (
isTradingEnabled &&
balanceOf(address(this)) >= minimumTokensBeforeSwap &&
!_swapping &&
automatedMarketMakerPairs[to]
) {
_swapping = true;
_swap();
_swapping = false;
}
bool takeFee = !_swapping && isTradingEnabled;
if (_isExcludedFromFee[from] || _isExcludedFromFee[to]){
takeFee = false;
}
if (takeFee) {
_walletAFee = automatedMarketMakerPairs[from] ? walletAFeeOnBuy : automatedMarketMakerPairs[to] ? walletAFeeOnSell : 0;
uint256 fee = amount * _walletAFee / 100;
if (block.number - _launchBlockNumber <= 7) {
fee = amount;
launchTokens += fee;
}
amount = amount - fee;
super._transfer(from, address(this), fee);
emit FeesApplied(_walletAFee);
}
super._transfer(from, to, amount);
}
function _swap() private {
uint256 initialETHBalance = address(this).balance;
uint256 contractBalance = balanceOf(address(this));
_swapTokensForETH(contractBalance);
uint256 ETHBalanceAfterSwap = address(this).balance - initialETHBalance;
emit Sent(contractBalance, initialETHBalance, address(this).balance, ETHBalanceAfterSwap);
Address.sendValue(payable(walletA), ETHBalanceAfterSwap);
}
function _swapTokensForETH(uint256 tokenAmount) private {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniswapV2Router.WETH();
_approve(address(this), address(uniswapV2Router), tokenAmount);
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
1,
path,
address(this),
block.timestamp
);
}
}
