Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin Contracts guidelines: functions revert
* instead returning `false` on failure. This behavior is nonetheless
* conventional and does not conflict with the expectations of ERC20
* applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overridden;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
function transferFrom(
address from,
address to,
uint256 amount
) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + addedValue);
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `from` to `to`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
*/
function _transfer(
address from,
address to,
uint256 amount
) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
unchecked {
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
_balances[account] += amount;
}
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_totalSupply -= amount;
}
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
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);
}
/**
* @dev Updates `owner` s allowance for `spender` based on spent `amount`.
*
* Does not update the allowance amount in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Might emit an {Approval} event.
*/
function _spendAllowance(
address owner,
address spender,
uint256 amount
) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* has been transferred to `to`.
* - when `from` is zero, `amount` tokens have been minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens have been burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `from` to `to` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 amount
) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
pragma solidity >=0.5.0;
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;
}
pragma solidity >=0.5.0;
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 Mint(address indexed sender, uint amount0, uint amount1);
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 mint(address to) external returns (uint liquidity);
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;
}
pragma solidity >=0.6.2;
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);
}
pragma solidity >=0.6.2;
import './IUniswapV2Router01.sol';
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;
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
contract NGS is ERC20, Ownable {
modifier lockSwap() {
_inSwap = true;
_;
_inSwap = false;
}
modifier liquidityAdd() {
_inLiquidityAdd = true;
_;
_inLiquidityAdd = false;
}
uint256 public constant MAX_MINT = 100_000_000 ether;
uint256 public constant BPS_DENOMINATOR = 10_000;
uint256 public constant SNIPE_BLOCKS = 2;
IUniswapV2Router02 internal immutable _router;
address internal immutable _pair;
/// @notice Buy taxes in BPS
uint256[2] public buyTaxes;
/// @notice Sell taxes in BPS
uint256[2] public sellTaxes;
/// @notice Maximum that can be bought in a single transaction
uint256 public maxBuy = 1_000_000 ether;
/// @notice tokens that are allocated for each tax
uint256[2] public totalTaxes;
/// @notice addresses that each tax is sent to
address payable[2] public taxWallets;
/// @notice Maps each recipient to their tax exlcusion status
mapping(address => bool) public taxExcluded;
/// @notice Maps address to flag indicating if they can call goup
mapping(address => bool) public goupable;
/// @notice Maps address to flag indicating if they can receive goup
mapping(address => bool) public goupReceiveable;
/// @notice Contract NGS balance threshold before `_swap` is invoked
uint256 public minTokenBalance = 1000 ether;
/// @notice Flag for auto-calling `_swap`
bool public autoSwap = true;
/// @notice Flag indicating whether buys/sells are permitted
bool public tradingActive = false;
uint256 internal _totalSupply = 0;
uint256 internal _minted = 0;
mapping(address => uint256) private _balances;
bool internal _inSwap = false;
bool internal _inLiquidityAdd = false;
event TaxWalletsChanged(
address payable[2] previousWallets,
address payable[2] nextWallets
);
event BuyTaxesChanged(uint256[2] previousTaxes, uint256[2] nextTaxes);
event SellTaxesChanged(uint256[2] previousTaxes, uint256[2] nextTaxes);
event MinTokenBalanceChanged(uint256 previousMin, uint256 nextMin);
event MaxBuyChanged(uint256 previousMax, uint256 nextMax);
event TaxesRescued(uint256 index, uint256 amount);
event TradingActiveChanged(bool enabled);
event TaxExclusionChanged(address user, bool taxExcluded);
event AutoSwapChanged(bool enabled);
event GoupableChanged(address user, bool goupable);
event GoupReceiveableChanged(address user, bool goupReceiveable);
constructor(
IUniswapV2Router02 _uniswapRouter,
address payable[2] memory _taxWallets,
uint256[2] memory _buyTaxes,
uint256[2] memory _sellTaxes,
uint256 _goupAmount
)
ERC20("NoGas", "NGS")
Ownable()
{
taxExcluded[owner()] = true;
taxExcluded[address(this)] = true;
taxWallets = _taxWallets;
buyTaxes = _buyTaxes;
sellTaxes = _sellTaxes;
_router = _uniswapRouter;
_pair = IUniswapV2Factory(_uniswapRouter.factory()).createPair(
address(this),
_uniswapRouter.WETH()
);
_goup(owner(), _goupAmount);
}
/// @notice Change the address of the tax wallets
/// @param _taxWallets The new address of the tax wallets
function setTaxWallets(address payable[2] memory _taxWallets)
external
onlyOwner
{
emit TaxWalletsChanged(taxWallets, _taxWallets);
taxWallets = _taxWallets;
}
/// @notice Change the buy tax rates
/// @param _buyTaxes The new buy tax rates
function setBuyTaxes(uint256[2] memory _buyTaxes) external onlyOwner {
require(
_buyTaxes[0] + _buyTaxes[1] <= BPS_DENOMINATOR,
"sum(_buyTaxes) cannot exceed BPS_DENOMINATOR"
);
emit BuyTaxesChanged(buyTaxes, _buyTaxes);
buyTaxes = _buyTaxes;
}
/// @notice Change the sell tax rates
/// @param _sellTaxes The new sell tax rates
function setSellTaxes(uint256[2] memory _sellTaxes) external onlyOwner {
require(
_sellTaxes[0] + _sellTaxes[1] <= BPS_DENOMINATOR,
"sum(_sellTaxes) cannot exceed BPS_DENOMINATOR"
);
emit SellTaxesChanged(sellTaxes, _sellTaxes);
sellTaxes = _sellTaxes;
}
/// @notice Change the minimum contract NGS balance before `_swap` gets invoked
/// @param _minTokenBalance The new minimum balance
function setMinTokenBalance(uint256 _minTokenBalance) external onlyOwner {
emit MinTokenBalanceChanged(minTokenBalance, _minTokenBalance);
minTokenBalance = _minTokenBalance;
}
/// @notice Change the max buy amount
/// @param _maxBuy The new max buy amount
function setMaxBuy(uint256 _maxBuy) external onlyOwner {
emit MaxBuyChanged(maxBuy, _maxBuy);
maxBuy = _maxBuy;
}
/// @notice Add a user to goupable
/// @param _user The user to add to goupable
function goupableAdd(address _user) external onlyOwner {
goupable[_user] = true;
emit GoupableChanged(_user, true);
}
/// @notice Remove a user from goupable
/// @param _user The user to remove from goupable
function goupableRemove(address _user) external onlyOwner {
goupable[_user] = false;
emit GoupableChanged(_user, false);
}
/// @notice Add a user to goupReceiveable
/// @param _user The user to add to goupReceiveable
function goupReceiveableAdd(address _user) external onlyOwner {
goupReceiveable[_user] = true;
emit GoupReceiveableChanged(_user, true);
}
/// @notice Remove a user from goupReceiveable
/// @param _user The user to remove from goupReceiveable
function goupReceiveableRemove(address _user) external onlyOwner {
goupReceiveable[_user] = false;
emit GoupReceiveableChanged(_user, false);
}
/// @notice Rescue NGS from the taxes
/// @dev Should only be used in an emergency
/// @param _index The tax allocation to rescue from
/// @param _amount The amount of NGS to rescue
/// @param _recipient The recipient of the rescued NGS
function rescueTaxTokens(
uint256 _index,
uint256 _amount,
address _recipient
) external onlyOwner {
require(0 <= _index && _index < totalTaxes.length, "_index OOB");
require(
_amount <= totalTaxes[_index],
"Amount cannot be greater than totalTax"
);
_rawTransfer(address(this), _recipient, _amount);
emit TaxesRescued(_index, _amount);
totalTaxes[_index] -= _amount;
}
function addLiquidity(uint256 tokens)
external
payable
onlyOwner
liquidityAdd
{
_goup(address(this), tokens);
_approve(address(this), address(_router), tokens);
_router.addLiquidityETH{value: msg.value}(
address(this),
tokens,
0,
0,
owner(),
// solhint-disable-next-line not-rely-on-time
block.timestamp
);
}
/// @notice Enables or disables trading on Uniswap
function setTradingActive(bool _tradingActive) external onlyOwner {
tradingActive = _tradingActive;
emit TradingActiveChanged(_tradingActive);
}
/// @notice Updates tax exclusion status
/// @param _account Account to update the tax exclusion status of
/// @param _taxExcluded If true, exclude taxes for this user
function setTaxExcluded(address _account, bool _taxExcluded)
external
onlyOwner
{
taxExcluded[_account] = _taxExcluded;
emit TaxExclusionChanged(_account, _taxExcluded);
}
/// @notice Enable or disable whether swap occurs during `_transfer`
/// @param _autoSwap If true, enables swap during `_transfer`
function setAutoSwap(bool _autoSwap) external onlyOwner {
autoSwap = _autoSwap;
emit AutoSwapChanged(_autoSwap);
}
function balanceOf(address account)
public
view
virtual
override
returns (uint256)
{
return _balances[account];
}
function _addBalance(address account, uint256 amount) internal {
_balances[account] = _balances[account] + amount;
}
function _subtractBalance(address account, uint256 amount) internal {
_balances[account] = _balances[account] - amount;
}
function _transfer(
address sender,
address recipient,
uint256 amount
) internal override {
if (taxExcluded[sender] || taxExcluded[recipient]) {
_rawTransfer(sender, recipient, amount);
return;
}
if (
totalTaxes[0] + totalTaxes[1] >= minTokenBalance &&
!_inSwap &&
sender != _pair &&
autoSwap
) {
_swap();
}
uint256 send = amount;
uint256[2] memory taxes;
if (sender == _pair) {
require(tradingActive, "Trading is not yet active");
(send, taxes) = _getTaxAmounts(amount, true);
require(amount <= maxBuy, "Buy amount exceeds maxBuy");
} else if (recipient == _pair) {
require(tradingActive, "Trading is not yet active");
(send, taxes) = _getTaxAmounts(amount, false);
}
_rawTransfer(sender, recipient, send);
_takeTaxes(sender, taxes);
}
/// @notice Perform a Uniswap v2 swap from NGS to ETH and handle tax distribution
function _swap() internal lockSwap {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = _router.WETH();
uint256 walletTaxes = totalTaxes[0] + totalTaxes[1];
_approve(address(this), address(_router), walletTaxes);
_router.swapExactTokensForETHSupportingFeeOnTransferTokens(
walletTaxes,
0, // accept any amount of ETH
path,
address(this),
block.timestamp
);
uint256 contractEthBalance = address(this).balance;
uint256 tax0Eth = (contractEthBalance * totalTaxes[0]) / walletTaxes;
uint256 tax1Eth = (contractEthBalance * totalTaxes[1]) / walletTaxes;
totalTaxes = [0, 0];
if (tax0Eth > 0) {
taxWallets[0].transfer(tax0Eth);
}
if (tax1Eth > 0) {
taxWallets[1].transfer(tax1Eth);
}
}
function swapAll() external {
if (!_inSwap) {
_swap();
}
}
function withdrawAll() external onlyOwner {
payable(owner()).transfer(address(this).balance);
}
/// @notice Transfers NGS from an account to this contract for taxes
/// @param _account The account to transfer NGS from
/// @param _taxAmounts The amount for each tax
function _takeTaxes(address _account, uint256[2] memory _taxAmounts)
internal
{
require(_account != address(0), "taxation from the zero address");
uint256 totalAmount = _taxAmounts[0] + _taxAmounts[1];
_rawTransfer(_account, address(this), totalAmount);
totalTaxes[0] += _taxAmounts[0];
totalTaxes[1] += _taxAmounts[1];
}
/// @notice Get a breakdown of send and tax amounts
/// @param amount The amount to tax in wei
/// @return send The raw amount to send
/// @return taxes The raw tax amounts
function _getTaxAmounts(uint256 amount, bool buying)
internal
view
returns (uint256 send, uint256[2] memory taxes)
{
if (buying) {
taxes = [
(amount * buyTaxes[0]) / BPS_DENOMINATOR,
(amount * buyTaxes[1]) / BPS_DENOMINATOR
];
} else {
taxes = [
(amount * sellTaxes[0]) / BPS_DENOMINATOR,
(amount * sellTaxes[1]) / BPS_DENOMINATOR
];
}
send = amount - taxes[0] - taxes[1];
}
// modified from OpenZeppelin ERC20
function _rawTransfer(
address sender,
address recipient,
uint256 amount
) internal {
require(sender != address(0), "transfer from the zero address");
require(recipient != address(0), "transfer to the zero address");
uint256 senderBalance = balanceOf(sender);
require(senderBalance >= amount, "transfer amount exceeds balance");
unchecked {
_subtractBalance(sender, amount);
}
_addBalance(recipient, amount);
emit Transfer(sender, recipient, amount);
}
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
function _goup(address account, uint256 amount) internal {
require(_minted + amount <= MAX_MINT, "Max supply exceeded");
_minted += amount;
_totalSupply += amount;
_addBalance(account, amount);
emit Transfer(address(0), account, amount);
}
function goup(address account, uint256 amount) external {
require(goupable[msg.sender], "NGS: goupableOnly");
require(goupReceiveable[account], "NGS: goupReceiveableOnly");
_goup(account, amount);
}
/// @notice Burn own tokens
/// @param amount The amount of tokens to burn
function burn(uint256 amount) external {
_totalSupply -= amount;
_subtractBalance(msg.sender, amount);
emit Transfer(msg.sender, address(0), amount);
}
receive() external payable {}
}