UNFTrev2.sol

/*
  _   _ _ _   _                 _         _   _ _____ _____ 
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 | | | | | __| | '_ ` _ \ / _` | __/ _ \ |  \| | |_    | |  
 | |_| | | |_| | | | | | | (_| | ||  __/ | |\  |  _|   | |  
  \___/|_|\__|_|_| |_| |_|\__,_|\__\___| |_| \_|_|     |_|  
  
A ERC-20 designed with improved security for sensitive functions and liquidity fees/burns.
                                                            
Author: Grant Fields
*/
pragma solidity 0.8.9;
// SPDX-License-Identifier: MIT

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

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

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 IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

contract Ultimate is IERC20, Context {
    
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private feeExcluded;

    uint256 private _totalSupply;
    
    address private contractOwner;
    address payable public feeAddress = payable(0xbcED8d1e27deBA6473792063e886816E634492a1);
    address public immutable deadAddress = 0x000000000000000000000000000000000000dEaD;
    address private secureSignerOne;
    uint256 private signerOneTime;
    
    address private secureSignerTwo;
    uint256 private signerTwoTime;

    string private _name;
    string private _symbol;
    uint256 public feePercent = 5;
    uint256 private previousFee;
    uint256 public feeDivisor = 3;
    
    IUniswapV2Router02 public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;
    
    bool inSwapAndLiquify;
    bool public liquiditySwapEnabled = true;
    
    uint256 public nativeSwapThresh = 2500000 * 10**18;
    
    constructor(address _secureSignerOne, address _secureSignerTwo){
        require(_secureSignerOne != address(0) && _secureSignerOne != msg.sender, "Signer #1 is zero address or owner");
        require(_secureSignerTwo != address(0) && _secureSignerTwo != msg.sender, "Signer #2 is zero address or owner");
        require(_secureSignerOne != _secureSignerTwo, "Signers are identical");
        _name = "Ultimate NFT";
        _symbol = "UNFT";
        _totalSupply = 1000000000 * 10**18;
        contractOwner = msg.sender;
        secureSignerOne = _secureSignerOne;
        secureSignerTwo = _secureSignerTwo;
        
        
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        uniswapV2Router = _uniswapV2Router;
        
        feeExcluded[address(this)] = true;
        feeExcluded[contractOwner] = true;
        
        _balances[contractOwner] = _totalSupply;
        emit Transfer(address(0), contractOwner, _totalSupply);
    }
    
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event SignerTransferred(address indexed previousSigner, address indexed newSigner);
    event changeFeePercent(uint256 oldValue, uint256 newValue);
    event changeFeeDivisor(uint256 oldValue, uint256 newValue);
    event setTokenSwapThreshold(uint256 oldValue, uint256 newValue);
    event SetLiquiditySwap(bool status);
    event feeOn(bool status);
    event SwapTokensForETH(uint256 amountIn, address[] path);
    modifier lockSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }
    /*
        GF: In order for a contractOwner to make a significant call,
        it is required that both secureSignerOne & secureSignerTwo
        have authenticated access for the contractOwner. They will 
        both individually call signerAuthenticator(), which will 
        open a window of ~1 hour during which a contractOwner 
        can sucessfully make calls. Both signers are required to 
        authenticate before contractOwner can make sucessful calls.
    */
    modifier secureAuth() {
        require(contractOwner == _msgSender(), "Caller is not contractOwner");
        require(signerOneTime > block.timestamp, "Signer #1 not authenticated.");
        require(signerTwoTime > block.timestamp, "Signer #2 not authenticated.");
        _;
    }
    
    modifier signerVerifed() {
        require(secureSignerOne == _msgSender() || secureSignerTwo == _msgSender(), "Caller is not a signer");
        _;
    }
    modifier signerOrOwner() {
        require(contractOwner == _msgSender() || secureSignerOne == _msgSender() || secureSignerTwo == _msgSender(), "Caller not owner or signer");
        _;
    }
    
    function signerAuthenticator() public signerVerifed returns (uint256) {
        if (secureSignerOne == _msgSender()){
            signerOneTime = block.timestamp + 1 hours;
            return signerOneTime;
        } else if (secureSignerTwo == _msgSender()){
            signerTwoTime = block.timestamp + 1 hours;
            return signerTwoTime;
        } else {
            return 0;
        }
    }
    
    function getSignerTime() public view signerVerifed returns (uint256) {
        if (secureSignerOne == _msgSender()){
            return signerOneTime;
        } else if (secureSignerTwo == _msgSender()){
            return signerTwoTime;
        } else {
            return 0;
        }
    }
    
    function signerAuth() public view signerOrOwner returns (bool){
        if (signerOneTime > block.timestamp && signerTwoTime > block.timestamp) {
            return true;
        } else {
            return false;
        }
    }
    
    function transferSigner(address _newSigner) public virtual signerVerifed {
        if (secureSignerOne == _msgSender()){
            require(_newSigner != address(0) && _newSigner != _msgSender(), "Input is zero address or self");
            require(_newSigner != contractOwner && _newSigner != secureSignerTwo, "Input is contractOwner or other signer");
            secureSignerOne = _newSigner;
            emit SignerTransferred(_msgSender(), _newSigner);
        } else if (secureSignerTwo == _msgSender()){
            require(_newSigner != address(0) && _newSigner != _msgSender(), "Input is zero address or self");
            require(_newSigner != contractOwner && _newSigner != secureSignerOne, "Input is contractOwner or other signer");
            secureSignerTwo = _newSigner;
            emit SignerTransferred(_msgSender(), _newSigner);
        }
    }
    
    function isSigner() public view returns (bool){
        if (secureSignerOne == _msgSender()){
            return true;
        } else if (secureSignerTwo == _msgSender()){
            return true;
        } else{
            return false;
        }
    }
    
    function getContractOwner() public view returns (address) {
        return contractOwner;
    }

    function setFeeOff() public secureAuth {
        previousFee = feePercent;
        feePercent = 0;
        liquiditySwapEnabled = false;
        emit feeOn(false);
    }
    
    function setFeeOn() public secureAuth {
        feePercent = previousFee;
        liquiditySwapEnabled = true;
        emit feeOn(true);
    }
    
    function setLiquiditySwap(bool status) public secureAuth {
        liquiditySwapEnabled = status;
        emit SetLiquiditySwap(status);
    }
    
    function setFeePercent(uint256 _feePercent) public secureAuth {
        require (_feePercent > feeDivisor);
        emit changeFeePercent(feePercent, _feePercent);
        feePercent = _feePercent;
    }
    
    function setDivisor(uint256 _divisor) public secureAuth {
        require (_divisor < feePercent);
        emit changeFeeDivisor(feeDivisor, _divisor);
        feeDivisor = _divisor;
    }
    
    function setFeeAddress(address payable _feeAddress) public secureAuth {
        feeAddress = _feeAddress;
    }
    
    function setSwapThreshold(uint256 amount) public secureAuth {
        require(amount > 0 && amount < _totalSupply);
        emit setTokenSwapThreshold(nativeSwapThresh, amount);
        nativeSwapThresh = amount;
    }
    
    function excludeFromFee(address user) public secureAuth {
        feeExcluded[user] = true;
    }
    
    function includeInFee(address user) public secureAuth {
        feeExcluded[user] = false;
    }

    function transferOwnership(address _newOwner) public virtual secureAuth {
        require(_newOwner != address(0) && _newOwner != secureSignerOne && _newOwner != secureSignerTwo, "Input is zero address or a signer");
        emit OwnershipTransferred(contractOwner, _newOwner);
        contractOwner = _newOwner;
    }
    
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public pure 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];
    }
    
    /*
        Approve & Allowance
    */
    
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }
    
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }
        return true;
    }
    
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    /*
        Transfers
    */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _transfer(sender, recipient, amount);
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }
        return true;
    }
    
    function _transfer(address sender, address recipient, uint256 amount) private {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        
        uint256 contractTokenBalance = balanceOf(address(this));
        uint256 leftover;

        if (!inSwapAndLiquify && liquiditySwapEnabled && recipient == uniswapV2Pair) {
            if (contractTokenBalance >= nativeSwapThresh) {
                contractTokenBalance = ((nativeSwapThresh) * (feeDivisor)) / (feePercent);
                leftover = nativeSwapThresh - contractTokenBalance;
                feeTokenSwap(contractTokenBalance);
                _transfer(address(this), deadAddress, leftover);
            }
        }
        bool takeFee = true;
        if(feeExcluded[sender] || feeExcluded[recipient]){
            takeFee = false;
        }
        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        if (takeFee && feePercent > 0) {
            uint256 feeAmount = getFeeAmount(amount, takeFee);
            uint256 transferAmount = amount - feeAmount;
            _balances[recipient] = _balances[recipient] + transferAmount;
            _balances[address(this)] = _balances[address(this)] + feeAmount;
        } else {
            _balances[recipient] += amount;
        }
        emit Transfer(sender, recipient, amount);
    }
    
    function feeTokenSwap(uint256 amount) private lockSwap {
        swapTokensForEth(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,
            feeAddress, 
            block.timestamp
        );
        emit SwapTokensForETH(tokenAmount, path);
    }
    
    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 getFeeAmount(uint256 amount, bool takeFee) private view returns(uint256) {
        if (!takeFee){
            return 0;
        } else {
            return amount*feePercent/(10**2);
        }
    }
}