[区块链]智能合约之经典土狗（二）

土狗合约规则或机制：

一：买入，卖出12%税收，
1：买入
? ?1）：3%添加流动性
? ?2）：2%销毁打入0x000...0即：address(0)地址

2：卖出：
? ? 1）：5%打入项目方提供地址
?

3：7%用于推广奖励，
? ? ? ? 1代:?30/70
? ? ? ? 2代：10/70?，3~8代：5/70

二：转账扣3%，打入项目方地址
三：前四天，每天每个地址有购买上限
邀请：通过向无持币地址转账任意代币数量绑定邀请关系

/**
 *Submitted for verification at BscScan.com on 2022-02-25
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

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;
    }


    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }


    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

library Address {

    function isContract(address account) internal view returns (bool) {
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

contract Ownable is Context {
    address internal _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
     function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );
}

library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }

    function safeTransfer(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }

    function safeTransferFrom(address token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}

contract NVWAToken is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _tOwned;
    mapping (address => mapping (address => uint256)) private _allowances;

    mapping (address => bool) private _isExcludedFromFee;
   
    uint8 private _decimals = 9;
    uint256 private _tTotal = 16000 * 10**9;

    string private _name = "NVWA";
    string private _symbol = "NVWA";
    
    uint256 public _buyLiquidityFee = 30;

    uint256 public _buyBurnFee = 20;

    uint256 public _sellMarketFee = 50;
    address public marketAddress1;
    address public marketAddress2;
    address public marketAddress3;

    uint256 public _shareFee = 70;

    uint[] internal shareConfig = [30,10,5,5,5,5,5,5];

    uint256 public totalBuyFee = 120;
    uint256 public totalSellFee = 120;

    uint256 public transferFee = 30;

    uint256 public sellUpperLimit = 90;

    mapping(address => bool) public initPoolAddress;
    mapping(uint => uint) public dayBuyLimits;

    mapping(address => mapping(uint => uint)) public addressBuyAmounts;

    IUniswapV2Router02 public immutable uniswapV2Router;
    address public  uniswapV2Pair;

    mapping(address => bool) public ammPairs;
    
    bool inSwapAndLiquify;
    
    uint256 public _maxTxAmount = 1 * 10**9;
    
    address public wbnb;    

    address public holder;

    address constant public rootAddress = address(0x000000000000000000000000000000000000dEaD);
    
    mapping (address => address) public _recommerMapping;

    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }
    
    constructor (
        address _wbnb,
        address _route,
        address _holder,
        address[3] memory _marketAddress,
        address[3] memory _initPoolAddress) public {
        
         wbnb = _wbnb;
         holder = _holder;
         marketAddress1 = _marketAddress[0];
         marketAddress2 = _marketAddress[1];
         marketAddress3 = _marketAddress[2];

        _recommerMapping[rootAddress] = address(0xdeaddead);
        _recommerMapping[holder] = rootAddress;
        _recommerMapping[marketAddress1] = rootAddress;
        _recommerMapping[marketAddress2] = rootAddress;
        _recommerMapping[marketAddress3] = rootAddress;

        _tOwned[holder] = _tTotal;
        
         IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(_route);
         uniswapV2Router = _uniswapV2Router;
         
        address _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), wbnb);
        
        uniswapV2Pair = _uniswapV2Pair;

        ammPairs[uniswapV2Pair] = true;

        _isExcludedFromFee[_holder] = true;
        _isExcludedFromFee[address(this)] = true;

        _owner = msg.sender;

        uint time = block.timestamp / 1 days * 1 days;
        for( uint i = 0; i < 4; i ++){
            dayBuyLimits[time + i * 86400] = (i + 1) * 1e9;
        }

        for( uint i = 0; i < 3; i++ ){
            initPoolAddress[_initPoolAddress[0]] = true;
        }
        emit Transfer(address(0), _holder, _tTotal);
    }
   
    function setMaxTx(uint256 maxTx) external onlyOwner{
        _maxTxAmount = maxTx;
    }

    function setBuyLimit(uint day,uint amount)external onlyOwner{
        dayBuyLimits[day] = amount;
    }

    function setAmmPair(address pair,bool hasPair)external onlyOwner{
        ammPairs[pair] = hasPair;
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _tOwned[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, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    
    function excludeFromFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = true;
    }

    function excludeFromFees(address[] memory accounts) public onlyOwner{
        uint len = accounts.length;
        for( uint i = 0; i < len; i++ ){
            _isExcludedFromFee[accounts[i]] = true;
        }
    }
    
    function includeInFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = false;
    }
    
    receive() external payable {}

    function _take(uint256 tValue,address from,address to) private {
        _tOwned[to] = _tOwned[to].add(tValue);
        emit Transfer(from, to, tValue);
    }
    
    function getForefathers(address owner,uint num) internal view returns(address[] memory fathers){
        fathers = new address[](num);
        address parent  = owner;
        for( uint i = 0; i < num; i++){
            parent = _recommerMapping[parent];
            if( parent == rootAddress || parent == address(0) ) break;
            fathers[i] = parent;
        }
    }

    function _takeShare(uint tShare,address from,address user) private {

        address[] memory farthers = getForefathers(user,8);

        uint len = farthers.length;

        uint sended = 0;
        for( uint i = 0; i < len; i++ ){

            address parent = farthers[i];

            if( parent == address(0)) break;

            uint tv = tShare * shareConfig[i] / 70;

            _tOwned[parent] = _tOwned[parent].add(tv);
            emit Transfer(from, parent, tv);
            sended += tv;
        }  
        
        if( tShare > sended ){
            _take(tShare - sended,from,marketAddress1);
        }
    }
    
    function isExcludedFromFee(address account) public view returns(bool) {
        return _isExcludedFromFee[account];
    }

    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 addRelationEx(address recommer,address user) internal {
        if( 
            recommer != user 
            && _recommerMapping[user] == address(0x0) 
            && _recommerMapping[recommer] != address(0x0) ){
                _recommerMapping[user] = recommer;
        }       
    }

    struct Param{
        bool takeFee;
        uint tTransferAmount;
        uint tLiquidity;
        uint tBurn;
        uint tMarket;
        uint tShare;
        address user;
        address mkAddress;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

        if( 
            !_isContract(to) 
            && _recommerMapping[to] == address(0) ){
            
            if( ammPairs[from]  ){
                addRelationEx(holder,to);
            }else{
                addRelationEx(from,to);
            }
        }
         
        uint256 contractTokenBalance = balanceOf(address(this));
        
        if( 
            contractTokenBalance >= _maxTxAmount 
            && !inSwapAndLiquify 
            && !ammPairs[from] 
            && IERC20(uniswapV2Pair).totalSupply() > 1000 ){

            swapAndLiquify(contractTokenBalance);
        }
        
        bool takeFee = true;

        if( _isExcludedFromFee[from] || _isExcludedFromFee[to]){
            takeFee = false;
        }
        
        Param memory param;

        if( takeFee ){
           param.takeFee = true;
           if( ammPairs[from]){
               _getBuyParam(amount,param);
               param.user = to;
            
               if( !_isExcludedFromFee[to]){

                    uint time = block.timestamp / 1 days * 1 days;
                    
                    uint limit = dayBuyLimits[time];
                    if( limit > 0 ){
                        require(addressBuyAmounts[to][time] + amount <= limit,"buy exceed limit");
                        addressBuyAmounts[to][time] += amount;
                    }
               }
           }

           if( ammPairs[to]){
                _getSellParam(amount,param);
               param.user = from;

               if( !_isExcludedFromFee[from]){

                   uint sellLimit = balanceOf(from) * sellUpperLimit / 100;

                   require(amount <= sellLimit ,"sell exceed limit");
               }
           }

           if( !ammPairs[from] && !ammPairs[to]){
                _getTransferParam(amount,param);
           }
        }else{
            param.tTransferAmount = amount;
        }

        if( ammPairs[to]){
            if( IERC20(uniswapV2Pair).totalSupply() == 0 ){
                require(initPoolAddress[from],"not init pool address");
            }
        }
        
        _tokenTransfer(from,to,amount,param);
    }


    function _getBuyParam(uint256 tAmount,Param memory param) private view  {
        param.tLiquidity = tAmount * _buyLiquidityFee / 1000;
        param.tBurn = tAmount * _buyBurnFee / 1000;
        param.tShare = tAmount * _shareFee / 1000;
        uint tFee = tAmount * totalBuyFee / 1000;
        param.tTransferAmount = tAmount.sub(tFee);
    }

    function _getSellParam(uint256 tAmount,Param memory param) private view  {
        param.tMarket = tAmount * _sellMarketFee / 1000;
        param.tShare = tAmount * _shareFee / 1000;
        param.mkAddress = marketAddress2;
        uint tFee = tAmount * totalSellFee / 1000;
        param.tTransferAmount = tAmount.sub(tFee);
    }

    function _getTransferParam(uint256 tAmount,Param memory param) private view {
        param.tMarket = tAmount * transferFee / 1000;
        param.mkAddress = marketAddress3;
        param.tTransferAmount = tAmount.sub(param.tMarket);
    }

    function swapAndLiquify(uint256 contractTokenBalance) private  lockTheSwap{
        
        uint256 half = contractTokenBalance.div(2);
        uint256 otherHalf = contractTokenBalance.sub(half);

        uint256 initialBalance = address(this).balance;

        swapTokensForEth(half,address(this)); 

        uint256 newBalance = address(this).balance.sub(initialBalance);

        addLiquidity(otherHalf, newBalance);
    }

    function swapTokensForEth(uint256 tokenAmount,address to) private {
        
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = wbnb;

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, 
            path,
            to,
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        
        _approve(address(this), address(uniswapV2Router), tokenAmount);

        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            holder,
            block.timestamp
        );
    }

    function _takeFee(Param memory param,address from)private {
        if( param.tBurn > 0 ){
            _take(param.tBurn, from, address(0));
        }
        if( param.tLiquidity > 0 ){
            _take(param.tLiquidity, from, address(this));
        }
        if( param.tMarket > 0 ){
            _take(param.tMarket, from, param.mkAddress);
        }
        if( param.tShare > 0 ){
             _takeShare(param.tShare,from,param.user);
        }
    }

    function _tokenTransfer(address sender, address recipient, uint256 tAmount,Param memory param) private {
        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _tOwned[recipient] = _tOwned[recipient].add(param.tTransferAmount);
         emit Transfer(sender, recipient, param.tTransferAmount);
        if(param.takeFee){
            _takeFee(param,sender);
        }
    }

    function donateDust(address addr, uint256 amount) external onlyOwner {
        TransferHelper.safeTransfer(addr, _msgSender(), amount);
    }

    function donateEthDust(uint256 amount) external onlyOwner {
        TransferHelper.safeTransferETH(_msgSender(), amount);
    }

     function _isContract(address a) internal view returns(bool){
        uint256 size;
        assembly {size := extcodesize(a)}
        return size > 0;
    }
    

}

链接：Contract Address 0x8Df056629356A1cbc91C1C8F30e94F48555b233D | BscScan

申明：作者只是感兴趣收集，其它一切事项与本人无关，也欢迎其他人与我沟通交流

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