Helpful?
The DONASWAP (DONA) smart contract
| Network | ChainId | Contract Address | Explorer |
|---|---|---|---|
| BNB Smart Chain | 56 | 0x229c32460c6beac113e720ac4a7495b57f53f7cf | Code |
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.19;
/**
* @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) {
this; // silence state mutability warning without generating bytecode - see
return msg.data;
}
}
/**
* @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.
*/
contract Ownable is Context {
address private _owner;
address private _previousOwner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
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 {
emit OwnershipTransferred(_owner, address(0));
_owner = 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");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
/**
* @dev Interface of the token standard as defined in the EIP.
*/
interface IToken {
/**
* @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/solidity/issues/2691
* 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);
}
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
interface IDexFactory {
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 IDexPair {
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;
}
interface IDexRouter01 {
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 IDexRouter02 is IDexRouter01 {
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 DONASWAP is IToken, Ownable {
using SafeMath for uint256;
mapping (address => uint256) private _reflections;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
mapping (address => bool) private _isExcludedFromFee;
mapping (address => bool) private _isExcluded;
address[] private _excluded;
uint256 private constant MAX = ~uint256(0);
uint256 private constant _totalSupply = 100000 * 10**6 * 10**9;
uint256 private _reflectionTotal = (MAX - (MAX % _totalSupply));
uint256 private _takeFeeTotal;
string private constant _name = "DONASWAP";
string private constant _symbol = "DONA";
uint8 private constant _decimals = 9;
uint256 public _taxFee = 5;
uint256 private _previousTaxFee = _taxFee;
uint256 public _liquidityFee = 5;
uint256 private _previousLiquidityFee = _liquidityFee;
IDexRouter02 public dexRouter;
address public dexPair;
bool inSwapAndLiquify;
bool public swapAndLiquifyEnabled = true;
uint256 public _maxTransactionAmount = 500 * 10**6 * 10**9;
uint256 private _tokensToAddToLiquidity = 50 * 10**6 * 10**9;
event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
event SwapAndLiquifyEnabledUpdated(bool enabled);
event SwapAndLiquify(
uint256 tokensSwapped,
uint256 nativeReceived,
uint256 tokensIntoLiquidity
);
modifier lockTheSwap {
inSwapAndLiquify = true;
_;
inSwapAndLiquify = false;
}
constructor() {
_reflections[_msgSender()] = _reflectionTotal;
IDexRouter02 _dexRouter = IDexRouter02(0x10ED43C718714eb63d5aA57B78B54704E256024E);
// Create a swap pair for this new token
dexPair = IDexFactory(_dexRouter.factory())
.createPair(address(this), _dexRouter.WETH());
// set the rest of the contract variables
dexRouter = _dexRouter;
//exclude owner and this contract from fee
_isExcludedFromFee[owner()] = true;
_isExcludedFromFee[address(this)] = true;
emit Transfer(address(0), _msgSender(), _totalSupply);
}
/**
* @dev Returns the name of the token.
*/
function name() public pure returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public pure 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 default value returned by this function, unless
* it's overridden.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {Token-balanceOf} and {Token-transfer}.
*/
function decimals() public pure returns (uint8) {
return _decimals;
}
/**
* @dev See {Token-totalSupply}.
*/
function totalSupply() public pure returns (uint256) {
return _totalSupply;
}
/**
* @dev See {Token-balanceOf}.
*/
function balanceOf(address account) public view override returns (uint256) {
if (_isExcluded[account]) return _balances[account];
return tokensfromreflection(_reflections[account]);
}
/**
* @dev See {Token-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 override returns (bool) {
_transfer(_msgSender(), to, amount);
return true;
}
/**
* @dev See {Token-allowance}.
*/
function allowance(address owner, address spender) public view override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {Token-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 override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {Token-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {Token}.
*
* 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 override returns (bool) {
_transfer(from, to, amount);
_approve(from, _msgSender(), _allowances[from][_msgSender()].sub(amount, "Token: transfer amount exceeds allowance"));
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 {IToken-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) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(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 {IToken-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) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "Token: decreased allowance below zero"));
return true;
}
function isExcludedFromReward(address account) public view returns (bool) {
return _isExcluded[account];
}
function totalFees() public view returns (uint256) {
return _takeFeeTotal;
}
function minimumTokenAmountBeforeSwap() public view returns (uint256) {
return _tokensToAddToLiquidity;
}
function deliver(uint256 totalAmount) public {
address from = _msgSender();
require(!_isExcluded[from], "Excluded addresses cannot call this function");
(uint256 reflectionAmount,,,,,) = _getValues(totalAmount);
_reflections[from] = _reflections[from].sub(reflectionAmount);
_reflectionTotal = _reflectionTotal.sub(reflectionAmount);
_takeFeeTotal = _takeFeeTotal.add(totalAmount);
}
function reflectionFromToken(uint256 totalAmount, bool deductTransferFee) public view returns (uint256) {
require(totalAmount <= _totalSupply, "Amount must be less than supply");
if (!deductTransferFee) {
(uint256 reflectionAmount,,,,,) = _getValues(totalAmount);
return reflectionAmount;
} else {
(,uint256 reflectedTransferAmount,,,,) = _getValues(totalAmount);
return reflectedTransferAmount;
}
}
function tokensfromreflection(uint256 reflectionAmount) public view returns (uint256) {
require(reflectionAmount <= _reflectionTotal, "Amount must be less than total reflections");
uint256 currentRate = _getRate();
return reflectionAmount.div(currentRate);
}
function excludeFromReward(address account) public onlyOwner {
require(!_isExcluded[account], "Account is not excluded");
require(_excluded.length <= 50, "Excluded list is too long!");
if (_reflections[account] > 0) {
_balances[account] = tokensfromreflection(_reflections[account]);
}
_isExcluded[account] = true;
_excluded.push(account);
}
function includeInReward(address account) external onlyOwner() {
require(_isExcluded[account], "Account is not excluded");
for (uint256 i = 0; i < _excluded.length; i++) {
if (_excluded[i] == account) {
_excluded[i] = _excluded[_excluded.length - 1];
uint256 currentRate = _getRate();
_reflections[account] = _balances[account].mul(currentRate);
_balances[account] = 0;
_isExcluded[account] = false;
_excluded.pop();
break;
}
}
}
function _transferBothExcluded(address from, address to, uint256 totalAmount) private {
(uint256 reflectionAmount, uint256 reflectedTransferAmount, uint256 reflectionFee, uint256 totalTransferAmount, uint256 taxedFee, uint256 takeLiquidity) = _getValues(totalAmount);
_balances[from] = _balances[from].sub(totalAmount);
_reflections[from] = _reflections[from].sub(reflectionAmount);
_balances[to] = _balances[to].add(totalTransferAmount);
_reflections[to] = _reflections[to].add(reflectedTransferAmount);
_reflectFee(reflectionFee, taxedFee);
_takeLiquidity(takeLiquidity);
emit Transfer(from, to, totalTransferAmount);
}
function excludeFromFee(address account) public onlyOwner {
_isExcludedFromFee[account] = true;
}
function includeInFee(address account) public onlyOwner {
_isExcludedFromFee[account] = false;
}
function setTaxFeePercent(uint256 taxFee) external onlyOwner {
_taxFee = taxFee;
}
function setLiquidityFeePercent(uint256 liquidityFee) external onlyOwner {
_liquidityFee = liquidityFee;
}
function setMaxTransactionAmount(uint256 maxTransactionAmount) external onlyOwner {
_maxTransactionAmount = maxTransactionAmount;
}
function setTokensToAddToLiquidity(uint256 minimumTokensBeforeSwap) external onlyOwner() {
_tokensToAddToLiquidity = minimumTokensBeforeSwap;
}
function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
swapAndLiquifyEnabled = _enabled;
emit SwapAndLiquifyEnabledUpdated(_enabled);
}
// recieve native currency from active router when swapping
receive() external payable {}
function _reflectFee(uint256 reflectionFee, uint256 taxedFee) private {
_reflectionTotal = _reflectionTotal.sub(reflectionFee);
_takeFeeTotal = _takeFeeTotal.add(taxedFee);
}
function _getValues(uint256 totalAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
(uint256 totalTransferAmount, uint256 taxedFee, uint256 takeLiquidity) = _getTValues(totalAmount);
(uint256 reflectionAmount, uint256 reflectedTransferAmount, uint256 reflectionFee) = _getRValues(totalAmount, taxedFee, takeLiquidity, _getRate());
return (reflectionAmount, reflectedTransferAmount, reflectionFee, totalTransferAmount, taxedFee, takeLiquidity);
}
function _getTValues(uint256 totalAmount) private view returns (uint256, uint256, uint256) {
uint256 taxedFee = calculateTaxFee(totalAmount);
uint256 takeLiquidity = calculateLiquidityFee(totalAmount);
uint256 totalTransferAmount = totalAmount.sub(taxedFee).sub(takeLiquidity);
return (totalTransferAmount, taxedFee, takeLiquidity);
}
function _getRValues(uint256 totalAmount, uint256 taxedFee, uint256 takeLiquidity, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
uint256 reflectionAmount = totalAmount.mul(currentRate);
uint256 reflectionFee = taxedFee.mul(currentRate);
uint256 reflectionsLiquidity = takeLiquidity.mul(currentRate);
uint256 reflectedTransferAmount = reflectionAmount.sub(reflectionFee).sub(reflectionsLiquidity);
return (reflectionAmount, reflectedTransferAmount, reflectionFee);
}
function _getRate() private view returns (uint256) {
(uint256 reflectionSupply, uint256 tokenSupply) = _getCurrentSupply();
return reflectionSupply.div(tokenSupply);
}
function _getCurrentSupply() private view returns (uint256, uint256) {
uint256 reflectionSupply = _reflectionTotal;
uint256 tokenSupply = _totalSupply;
for (uint256 i = 0; i < _excluded.length; i++) {
if (_reflections[_excluded[i]] > reflectionSupply || _balances[_excluded[i]] > tokenSupply) return (_reflectionTotal, _totalSupply);
reflectionSupply = reflectionSupply.sub(_reflections[_excluded[i]]);
tokenSupply = tokenSupply.sub(_balances[_excluded[i]]);
}
if (reflectionSupply < _reflectionTotal.div(_totalSupply)) return (_reflectionTotal, _totalSupply);
return (reflectionSupply, tokenSupply);
}
function _takeLiquidity(uint256 takeLiquidity) private {
uint256 currentRate = _getRate();
uint256 reflectionsLiquidity = takeLiquidity.mul(currentRate);
_reflections[address(this)] = _reflections[address(this)].add(reflectionsLiquidity);
if(_isExcluded[address(this)])
_balances[address(this)] = _balances[address(this)].add(takeLiquidity);
}
function calculateTaxFee(uint256 _amount) private view returns (uint256) {
return _amount.mul(_taxFee).div(10**2);
}
function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {
return _amount.mul(_liquidityFee).div(10**2);
}
function removeAllFee() private {
if(_taxFee == 0 && _liquidityFee == 0) return;
_previousTaxFee = _taxFee;
_previousLiquidityFee = _liquidityFee;
_taxFee = 0;
_liquidityFee = 0;
}
function restoreAllFee() private {
_taxFee = _previousTaxFee;
_liquidityFee = _previousLiquidityFee;
}
function isExcludedFromFee(address account) public view returns (bool) {
return _isExcludedFromFee[account];
}
/**
* @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) private {
require(owner != address(0), "Token: approve from the zero address");
require(spender != address(0), "Token: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Moves tokens `amount` from `from` to `to`.
*
* This is 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
) private {
require(from != address(0), "Token: transfer from the zero address");
require(to != address(0), "Token: transfer to the zero address");
require(amount > 0, "Transfer amount must be greater than zero");
if(from != owner() && to != owner())
require(amount <= _maxTransactionAmount, "Transfer amount exceeds the maxTransactionAmount.");
// is the token balance of this contract address over the min number of
// tokens that we need to initiate a swap + liquidity lock?
// also, don't get caught in a circular liquidity event.
// also, don't swap & liquify if from is dex pair.
uint256 contractTokenBalance = balanceOf(address(this));
if(contractTokenBalance >= _maxTransactionAmount)
{
contractTokenBalance = _maxTransactionAmount;
}
bool overMinTokenBalance = contractTokenBalance >= _tokensToAddToLiquidity;
if (
overMinTokenBalance &&
!inSwapAndLiquify &&
from != dexPair &&
swapAndLiquifyEnabled
) {
contractTokenBalance = _tokensToAddToLiquidity;
// add liquidity
swapAndLiquify(contractTokenBalance);
}
// indicates if fee should be deducted from transfer
bool takeFee = true;
// if any account belongs to _isExcludedFromFee account then remove the fee
if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){
takeFee = false;
}
// transfer amount, it will take tax, burn, liquidity fee
_tokenTransfer(from, to, amount, takeFee);
}
function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {
// split the contract balance into halves
uint256 half = contractTokenBalance.div(2);
uint256 otherHalf = contractTokenBalance.sub(half);
// capture the contract's current native balance.
// this is so that we can capture exactly the amount of native that the
// swap creates, and not make the liquidity event include any native that
// has been manually sent to the contract
uint256 initialBalance = address(this).balance;
// swap tokens for native currency
swapTokensForNative(half); // <- this breaks the native currency -> swap when swap and liquify is triggered
// how much native currency did we just swap into?
uint256 newBalance = address(this).balance.sub(initialBalance);
// add liquidity to swap
addLiquidity(otherHalf, newBalance);
emit SwapAndLiquify(half, newBalance, otherHalf);
}
function swapTokensForNative(uint256 tokenAmount) private {
// generate the swap pair path of token -> wrapped native currency
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = dexRouter.WETH();
_approve(address(this), address(dexRouter), tokenAmount);
// make the swap
dexRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of native currency
path,
address(this),
block.timestamp
);
}
function addLiquidity(uint256 tokenAmount, uint256 nativeAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(dexRouter), tokenAmount);
// add the liquidity
dexRouter.addLiquidityETH{value: nativeAmount}(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
address(this),
block.timestamp
);
}
// this method is responsible for taking all fee, if takeFee is true
function _tokenTransfer(address from, address to, uint256 amount, bool takeFee) private {
if(!takeFee)
removeAllFee();
if (_isExcluded[from] && !_isExcluded[to]) {
_transferFromExcluded(from, to, amount);
} else if (!_isExcluded[from] && _isExcluded[to]) {
_transferToExcluded(from, to, amount);
} else if (_isExcluded[from] && _isExcluded[to]) {
_transferBothExcluded(from, to, amount);
} else {
_transferStandard(from, to, amount);
}
if(!takeFee)
restoreAllFee();
}
function _transferStandard(address from, address to, uint256 totalAmount) private {
(uint256 reflectionAmount, uint256 reflectedTransferAmount, uint256 reflectionFee, uint256 totalTransferAmount, uint256 taxedFee, uint256 takeLiquidity) = _getValues(totalAmount);
_reflections[from] = _reflections[from].sub(reflectionAmount);
_reflections[to] = _reflections[to].add(reflectedTransferAmount);
_takeLiquidity(takeLiquidity);
_reflectFee(reflectionFee, taxedFee);
emit Transfer(from, to, totalTransferAmount);
}
function _transferToExcluded(address from, address to, uint256 totalAmount) private {
(uint256 reflectionAmount, uint256 reflectedTransferAmount, uint256 reflectionFee, uint256 totalTransferAmount, uint256 taxedFee, uint256 takeLiquidity) = _getValues(totalAmount);
_reflections[from] = _reflections[from].sub(reflectionAmount);
_balances[to] = _balances[to].add(totalTransferAmount);
_reflections[to] = _reflections[to].add(reflectedTransferAmount);
_takeLiquidity(takeLiquidity);
_reflectFee(reflectionFee, taxedFee);
emit Transfer(from, to, totalTransferAmount);
}
function _transferFromExcluded(address from, address to, uint256 totalAmount) private {
(uint256 reflectionAmount, uint256 reflectedTransferAmount, uint256 reflectionFee, uint256 totalTransferAmount, uint256 taxedFee, uint256 takeLiquidity) = _getValues(totalAmount);
_balances[from] = _balances[from].sub(totalAmount);
_reflections[from] = _reflections[from].sub(reflectionAmount);
_reflections[to] = _reflections[to].add(reflectedTransferAmount);
_takeLiquidity(takeLiquidity);
_reflectFee(reflectionFee, taxedFee);
emit Transfer(from, to, totalTransferAmount);
}
function setRouterAddress(address newRouter) public onlyOwner() {
IDexRouter02 _newRouter = IDexRouter02(newRouter);
dexPair = IDexFactory(_newRouter.factory()).createPair(address(this), _newRouter.WETH());
dexRouter = _newRouter;
}
function getNativeCurrencyQuantity() public view returns (uint256) {
return address(this).balance;
}
function getNativeCurrency() external onlyOwner() {
uint256 balance = address(this).balance;
payable(owner()).transfer(balance);
}
function rescueTokens(address _tokenContract, uint256 _amount) external onlyOwner {
IToken tokenContract = IToken(_tokenContract);
tokenContract.transfer(msg.sender, _amount);
}
}