zellic-audit
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// This contract is part of Zellic’s smart contract dataset, which is a collection of publicly available contract code gathered as of March 2023.
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.7;
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;
address private _previousOwner;
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 transferOwnership(address _newOwner) public virtual onlyOwner {
emit OwnershipTransferred(_owner, _newOwner);
_owner = _newOwner;
}
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);
}
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 TCP is Context, IERC20, Ownable {
using SafeMath for uint256;
mapping (address => uint256) private _balOwned;
mapping (address => mapping (address => uint256)) private _allowances;
mapping (address => bool) private _isOutFromFee;
mapping (address => bool) private isBlacklisted;
uint256 private time;
uint256 private bTime;
uint256 private _totalSupply = 5 * 10**6 * 10**18;
struct TaxStructure {
uint256 totalPc;
uint256 pcMarketing;
uint256 pcCharity;
uint256 pcLP;
}
TaxStructure private sellTax = TaxStructure(70,50,10,10);
TaxStructure private buyTax = TaxStructure(200,180,10,10);
TaxStructure private ZERO = TaxStructure(0,0,0,0);
TaxStructure private initialTax = TaxStructure(990,990,0,0);
TaxStructure private initialSellTax = TaxStructure(600,600,0,0);
string private constant _name = unicode"THE CHARITY PROTOCOL";
string private constant _symbol = unicode"TCP";
uint8 private constant _decimals = 18;
uint256 private _maxTxAmount = _totalSupply.div(100);
uint256 private _maxWalletAmount = _totalSupply.div(50);
uint256 private liquidityParkedTokens = 0;
uint256 private marketingParkedTokens = 0;
uint256 private charityParkedTokens = 0;
uint256 private minBalance = _totalSupply.div(10000);
address payable private _marketingWallet;
address payable private _charityWallet;
IUniswapV2Router02 private uniswapV2Router;
address private uniswapV2PairAddress;
bool private tradingOpen;
bool private inSwap = false;
bool private swapEnabled = false;
modifier lockTheSwap {
inSwap = true;
_;
inSwap = false;
}
constructor () payable {
_marketingWallet = payable(0x38c9b247edd12C7d0fea06073299c07D9792116D);
_charityWallet = payable(0x7EEbFe8f2f909015EBa3b937e7B3Eb3363a9e6BA);
_balOwned[owner()] = _totalSupply;
uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
uniswapV2PairAddress = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
_isOutFromFee[owner()] = true;
_isOutFromFee[address(this)] = true;
_isOutFromFee[uniswapV2PairAddress] = true;
emit Transfer(address(0),address(this),_totalSupply);
}
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 view override returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) public view override returns (uint256) {
return _balOwned[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 approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "TCP: transfer amount exceeds allowance"));
return true;
}
function updateBuyTax(uint256 _marketing,uint256 _charity,uint256 _lp) external onlyOwner {
buyTax.pcLP = _lp;
buyTax.pcMarketing = _marketing;
buyTax.pcCharity = _charity;
buyTax.totalPc = _marketing.add(_lp).add(_charity);
require(buyTax.totalPc < 100,"TCP: Buy tax can not greater than 10%");
}
function updateSellTax(uint256 _marketing,uint256 _charity,uint256 _lp) external onlyOwner {
sellTax.pcLP = _lp;
sellTax.pcMarketing = _marketing;
sellTax.pcCharity = _charity;
sellTax.totalPc = _marketing.add(_lp).add(_charity);
require(sellTax.totalPc < 600,"TCP: Sell tax can not greater than 60%");
}
function updateLimits(uint256 maxTransactionPer,uint256 maxWaleltPer) external onlyOwner {
require(maxTransactionPer > 1 && maxWaleltPer > 1,"TCP: Max wallet and max transction limits should be greater than 1%");
_maxTxAmount = _totalSupply.mul(maxTransactionPer).div(100);
_maxWalletAmount = _totalSupply.mul(maxWaleltPer).div(100);
}
function removeLimits() external onlyOwner{
_maxTxAmount = _totalSupply;
}
function excludeFromFees(address[] calldata target) external onlyOwner{
for(uint i=0;i<target.length;i++)
_isOutFromFee[target[i]] = true;
}
function _approve(address owner, address spender, uint256 amount) private {
require(owner != address(0), "TCP: Approving from the zero address");
require(spender != address(0), "TCP: Approving 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), "TCP: Transfer from the zero address");
require(to != address(0), "TCP: Transfer to the zero address");
if (from != owner() && to != owner()) {
require(tradingOpen,"TCP: trading != true");
require(!isBlacklisted[from] && !isBlacklisted[to]);
TaxStructure storage _tax = ZERO;
if(!_isOutFromFee[to]){
require((_balOwned[to] + amount) <= _maxWalletAmount,"TCP: Max Wallet Limit");
require(amount <= _maxTxAmount,"TCP: Max TxAmount Limit");
if (from == uniswapV2PairAddress && to != address(uniswapV2Router)){
_tax = buyTax;
}
if(bTime > block.number){
_tax = initialTax;
}
}
else if (to == uniswapV2PairAddress && from != address(uniswapV2Router) && ! _isOutFromFee[from]) {
if(block.timestamp > time){
_tax = sellTax;
}else{
_tax = initialSellTax;
}
}
if (!inSwap && from != uniswapV2PairAddress && swapEnabled && !_isOutFromFee[from] && balanceOf(address(this)) > minBalance) {
swapBack();
}
if(_tax.totalPc>0){
uint256 txTax = amount.mul(_tax.totalPc).div(1000);
amount = amount.sub(txTax);
liquidityParkedTokens = liquidityParkedTokens.add(txTax.mul(_tax.pcLP).div(_tax.totalPc));
marketingParkedTokens = marketingParkedTokens.add(txTax.mul(_tax.pcMarketing).div(_tax.totalPc));
charityParkedTokens = charityParkedTokens.add(txTax.mul(_tax.pcCharity).div(_tax.totalPc));
_transferStandard(from,address(this),txTax);
}
}
_transferStandard(from,to,amount);
}
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,
0,
path,
address(this),
block.timestamp
);
}
function addLiquidity(uint256 tokenAmount,uint256 ethValue) private {
_approve(address(this),address(uniswapV2Router),tokenAmount);
uniswapV2Router.addLiquidityETH{value: ethValue}(address(this),tokenAmount,0,0,address(0xdEaD),block.timestamp);
}
function swapBack() private lockTheSwap {
uint256 contractTokenBalance = balanceOf(address(this));
uint256 totalTokensToSwap = liquidityParkedTokens + marketingParkedTokens + charityParkedTokens;
bool success;
if (contractTokenBalance == 0 || totalTokensToSwap == 0) {
return;
}
if (contractTokenBalance > minBalance * 20) {
contractTokenBalance = minBalance * 20;
}
// Halve the amount of liquidity tokens
uint256 liquidityTokens = (contractTokenBalance * liquidityParkedTokens) / totalTokensToSwap / 2;
uint256 amountToSwapForETH = contractTokenBalance.sub(liquidityTokens);
uint256 initialETHBalance = address(this).balance;
swapTokensForEth(amountToSwapForETH);
uint256 ethBalance = address(this).balance.sub(initialETHBalance);
uint256 ethForMarketing = ethBalance.mul(marketingParkedTokens).div(totalTokensToSwap);
uint256 ethForCharity = ethBalance.mul(charityParkedTokens).div(totalTokensToSwap);
uint256 ethForLiquidity = ethBalance - ethForMarketing - ethForCharity;
liquidityParkedTokens = 0;
marketingParkedTokens = 0;
charityParkedTokens = 0;
(success, ) = address(_charityWallet).call{value: ethForCharity}("");
if (liquidityTokens > 0 && ethForLiquidity > 0) {
addLiquidity(liquidityTokens, ethForLiquidity);
}
(success, ) = address(_marketingWallet).call{
value: address(this).balance
}("");
}
function enableTrading() external onlyOwner {
require(!tradingOpen,"trading is already open");
swapEnabled = true;
tradingOpen = true;
time = block.timestamp + (10 minutes);
bTime = block.number + 2;
}
function setBlacklist(address[] memory _isBlacklisted) public onlyOwner {
for (uint i = 0; i < _isBlacklisted.length; i++) {
isBlacklisted[_isBlacklisted[i]] = true;
}
}
function removeBlacklist(address[] memory notbot) public onlyOwner {
for(uint i=0;i<notbot.length;i++){isBlacklisted[notbot[i]] = false;}
}
function _transferStandard(address sender, address recipient, uint256 tAmount) private {
_balOwned[sender] = _balOwned[sender].sub(tAmount);
_balOwned[recipient] = _balOwned[recipient].add(tAmount);
emit Transfer(sender, recipient, tAmount);
}
receive() external payable {}
function manualSwap() external onlyOwner{
swapBack();
}
function recoverTokens(address tokenAddress) external onlyOwner {
require(tokenAddress != uniswapV2PairAddress);
IERC20 _token = IERC20(tokenAddress);
_token.transfer(msg.sender,_token.balanceOf(address(this)));
}
}