Hey guys!
Been working on this for two days straight, thrown money at it, thrown devs at it, and spent a ton of time trying to learn some solidity context...and I'm still learning TONS.
But I am also on a deadline, so I defer to you, the pros.
I am trying to cut into the _transferStandard function, and you can see that I added the function swapTokens on line 1387.
What that is supposed to do is take the passed-in _tv.tMarketingFee amount, and convert it into WETH via swapTokensForBNB.
Not even sure that the conversion actually happens tbh – but ideally once converted, the function sendETHToFee is used to send the converted amount to the payable marketingWallet address.
However what is happening now, is that I am not able to add liquidity to the contract due to a "execution reverted: TransferHelper: TRANSFER_FROM_FAILED" error.
So I'm thinking that either my code has a bug I am not seeing, or the conversion into WETH / ETH is maybe off or something.
Do you guys have any ideas? Thank you!
Code to reproduce
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.6;
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
* now has built in overflow checking.
*
* from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/math/SafeMath.sol
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// 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 (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @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) {
return a + b;
}
/**
* @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 a - b;
}
/**
* @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) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting 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 a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting 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) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* 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) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
/**
* @dev Collection of functions related to the address type
*
* from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Address.sol
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
/**
* @dev Adding Pancake Router and Pancake Pair interfaces here
*
* from https://github.com/pancakeswap/pancake-swap-periphery/blob/master/contracts/interfaces/IPancakeRouter01.sol
*/
interface IPancakeRouter01 {
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);
}
// from https://github.com/pancakeswap/pancake-swap-periphery/blob/master/contracts/interfaces/IPancakeRouter02.sol
interface IPancakeRouter02 is IPancakeRouter01 {
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;
}
// from https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakeFactory.sol
interface IPancakeFactory {
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;
}
// from https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakePair.sol
interface IPancakePair {
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 SwapBNBForTokens(uint256 amount, address[] path);
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;
}
/**
* @dev BEP20 Token interface
*/
interface IBEP20 {
/**
* @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 `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);
/**
* @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 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 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 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 {
address private _owner;
address private _previousOwner;
/**
* @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 GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*/
function _msgSender() internal view returns (address payable) {
return payable(msg.sender);
}
function _msgData() internal view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_owner = _msgSender();
emit OwnershipTransferred(address(0), _owner);
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _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 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 onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
}
contract NFTBABY is IBEP20, Ownable {
using SafeMath for uint256;
using Address for address;
IBEP20 token;
mapping(address => uint256) private _rBalances;
mapping(address => uint256) private _tBalances;
mapping(address => mapping(address => uint256)) private _allowances;
mapping(address => bool) private _isExcludedFromFee;
mapping(address => bool) private _isExcluded;
address[] private _excluded;
uint256 public buyBackUpperLimit = 2 * 10**16; // check this
uint256 private _buyTaxFee = 2; // Reflections Fee
uint256 private _buyBurnFee = 1; // Burn Fee
uint256 private _buyLiquidityFee = 3; // LP Fee
uint256 private _buyMarketingFee = 7; // Marketing Fee
uint256 private _buyBuybackFee = 2; // Buyback Fee - TO DO: FIX Buyback in BNB
uint256 private _sellTaxFee = 2; // Reflections Fee
uint256 private _sellBurnFee = 1;
uint256 private _sellLiquidityFee = 3;
uint256 private _sellMarketingFee = 7;
uint256 private _sellBuybackFee = 2;
string private constant _name = "NFT BABY";
string private constant _symbol = "BBY";
uint8 private constant _decimals = 9;
uint256 private constant _tTotalSupply = 1000000000000 * 10 ** 9;
uint256 private constant _buyMaxTxAmount = 5000000000 * 10 ** 9;
uint256 private constant _sellMaxTxAmount = 5000000000 * 10 ** 9;
uint256 private constant MAX = ~uint256(0);
uint256 private _rTotalSupply;
uint256 private _maxTxAmount;
uint256 private _taxFee;
uint256 private _previousTaxFee;
uint256 private _liquidityFee;
uint256 private _previousLiquidityFee;
uint256 private _marketingFee;
uint256 private _previousMarketingFee;
uint256 private _burnFee;
uint256 private _previousBurnFee;
uint256 private _buybackFee;
uint256 private _previousBuybackFee;
uint256 private _tFeeTotal;
uint256 private _tMarketingTotal;
uint256 private _tBurnTotal;
uint256 private _tBuybackTotal;
// wallet for burning
address public constant burnWallet = 0x000000000000000000000000000000000000dEaD;
// wallet for buybacks
address public constant buybackWallet = 0x3308f174810FD9b158bFE6DF81115752c44c6457;
// wallet for marketing
address payable public marketingWallet = payable(0xB56b30bb189de3A7CE61178e2754EA59Ca6078C4);
// Mainnet BSC - PancakeSwap Router V2
address private constant _pancakeRouterAddress = 0x10ED43C718714eb63d5aA57B78B54704E256024E; // USE THIS FOR LAUNCH
// Testnet BSC - PancakeSwap Router V2
// address private constant _pancakeRouterAddress = 0xD99D1c33F9fC3444f8101754aBC46c52416550D1; // TESTING
// Mainnet, Ropsten and etc ETH - Uniswap V2
// address private constant _pancakeRouterAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D; // TESTING
IPancakeRouter02 public immutable pancakeRouter;
address public immutable pancakePair;
// structs to reflect transfers and fees
struct tValues {
uint256 tTransferAmount;
uint256 tFee;
uint256 tLiquidity;
uint256 tMarketingFee;
uint256 tBurnFee;
uint256 tBuybackFee;
}
// structs for transfers and fees
struct rValues {
uint256 rAmount;
uint256 rTransferAmount;
uint256 rFee;
uint256 rLiquidity;
uint256 rMarketingFee;
uint256 rBurnFee;
uint256 rBuybackFee;
}
constructor() {
// set utility variables
_maxTxAmount = _buyMaxTxAmount;
_taxFee = _buyTaxFee;
_previousTaxFee = _taxFee;
_liquidityFee = _buyLiquidityFee;
_previousLiquidityFee = _liquidityFee;
_marketingFee = _buyMarketingFee;
_previousMarketingFee = _marketingFee;
_burnFee = _buyBurnFee;
_previousBurnFee = _burnFee;
_buybackFee = _buyBuybackFee;
_previousBuybackFee = _buybackFee;
token = IBEP20(address(this));
// set reflect total supply
_rTotalSupply = (MAX - (MAX % _tTotalSupply));
_rBalances[_msgSender()] = _rTotalSupply;
IPancakeRouter02 _pancakeRouter = IPancakeRouter02(_pancakeRouterAddress);
// Create a pancake pair for this new token
pancakePair = IPancakeFactory(_pancakeRouter.factory()).createPair(address(this), _pancakeRouter.WETH());
// set the rest of the contract variables
pancakeRouter = _pancakeRouter;
// exclude owner, this contract and marketing wallet from fee
// _isExcludedFromFee[owner()] = true;
// _isExcludedFromFee[address(this)] = true;
// _isExcludedFromFee[marketingWallet] = true;
// _isExcludedFromFee[burnWallet] = true;
// _isExcludedFromFee[buybackWallet] = true;
//FOR TESTING ONLY, CHANGE TO TRUE ON LAUNCH *******************
_isExcludedFromFee[owner()] = false;
_isExcludedFromFee[address(this)] = false;
_isExcludedFromFee[marketingWallet] = false;
_isExcludedFromFee[burnWallet] = false;
_isExcludedFromFee[buybackWallet] = false;
}
receive() external payable {}
function name() public pure returns (string memory) {
return _name;
}
function symbol() public pure returns (string memory) {
return _symbol;
}
function decimals() public pure returns (uint8) {
return _decimals;
}
function totalSupply() public pure override returns (uint256) {
return _tTotalSupply;
}
function balanceOf(address account) public view override returns (uint256) {
if (_isExcluded[account]) return _tBalances[account];
return tokenFromReflection(_rBalances[account]);
}
function getOwner() public view returns (address) {
return owner();
}
function transfer(address recipient, uint256 amount) public override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
function approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function allowance(address owner, address spender) public view override returns (uint256) {
return _allowances[owner][spender];
}
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
function totalFees() public view returns (uint256) {
return _tFeeTotal;
}
function totalMarketingFees() public view returns (uint256) {
return _tMarketingTotal;
}
function totalBurnFee() public view returns (uint256) {
return _tBurnTotal;
}
function excludeFromFee(address account) public onlyOwner {
_isExcludedFromFee[account] = true;
}
function includeInFee(address account) public onlyOwner {
_isExcludedFromFee[account] = false;
}
function isExcludedFromFee(address account) public view returns(bool) {
return _isExcludedFromFee[account];
}
function excludeFromReward(address account) public onlyOwner() {
require(account != marketingWallet, 'We can not exclude donation and marketing wallet.');
require(!_isExcluded[account], "Account is already excluded");
if (_rBalances[account] > 0) {
_tBalances[account] = tokenFromReflection(_rBalances[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];
_tBalances[account] = 0;
_isExcluded[account] = false;
_excluded.pop();
break;
}
}
}
function isExcludedFromReward(address account) public view returns (bool) {
return _isExcluded[account];
}
function setBuyTaxFeePercent(uint256 taxFee) external onlyOwner() {
_buyTaxFee = taxFee;
}
function setSellTaxFeePercent(uint256 taxFee) external onlyOwner() {
_sellTaxFee = taxFee;
}
function setBuyLiquidityFeePercent(uint256 liquidityFee) external onlyOwner() {
_buyLiquidityFee = liquidityFee;
}
function setSellLiquidityFeePercent(uint256 liquidityFee) external onlyOwner() {
_sellLiquidityFee = liquidityFee;
}
function setBuyMarketingFeePercent(uint256 marketingFee) external onlyOwner() {
_buyMarketingFee = marketingFee;
}
function setSellMarketingFeePercent(uint256 marketingFee) external onlyOwner() {
_sellMarketingFee = marketingFee;
}
function setBuyBurnFeePercent(uint256 burnFee) external onlyOwner() {
_buyBurnFee = burnFee;
}
function setSellBurnFeePercent(uint256 burnFee) external onlyOwner() {
_sellBurnFee = burnFee;
}
function setBuyBuybackFeePercent(uint256 buybackFee) external onlyOwner() {
_buyBuybackFee = buybackFee;
}
function setSellBuybackFeePercent(uint256 buybackFee) external onlyOwner() {
_sellBuybackFee = buybackFee;
}
function reflectionFromToken(uint256 tAmount, bool deductTransferFee) public view returns (uint256) {
require(tAmount <= _tTotalSupply, "Amount must be less than supply");
if (!deductTransferFee) {
(rValues memory _rv, tValues memory _tv) = _getValues(tAmount);
_tv.tTransferAmount = 0; _tv.tFee = 0; _tv.tLiquidity = 0; _tv.tMarketingFee = 0; _tv.tBurnFee = 0; _tv.tBuybackFee = 0;
_rv.rTransferAmount = 0; _rv.rFee = 0; _rv.rLiquidity = 0; _rv.rMarketingFee = 0; _rv.rBurnFee = 0; _rv.rBuybackFee = 0;
return _rv.rAmount;
} else {
(rValues memory _rv, tValues memory _tv) = _getValues(tAmount);
_tv.tTransferAmount = 0; _tv.tFee = 0; _tv.tLiquidity = 0; _tv.tMarketingFee = 0; _tv.tBurnFee = 0; _tv.tBuybackFee = 0;
_rv.rTransferAmount = 0; _rv.rFee = 0; _rv.rLiquidity = 0; _rv.rMarketingFee = 0; _rv.rBurnFee = 0; _rv.rBuybackFee = 0;
return _rv.rTransferAmount;
}
}
function tokenFromReflection(uint256 rAmount) public view returns (uint256) {
require(rAmount <= _rTotalSupply, "Amount must be less than total reflections");
return rAmount.div(_getRate());
}
function _transfer(address from, address to, uint256 amount) private {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
require(amount > 0, "Transfer amount must be greater than zero");
if (from != owner() && to != owner()) {
if (from == pancakePair) { // Buy
_maxTxAmount = _buyMaxTxAmount;
} else if (to == pancakePair) { // Sell
_maxTxAmount = _sellMaxTxAmount;
} else { // other
_maxTxAmount = _buyMaxTxAmount;
}
require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");
}
// 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;
} else {
// set _taxFee and _liquidityFee to buy or sell action
if (from == pancakePair) { // Buy
_taxFee = _buyTaxFee;
_liquidityFee = _buyLiquidityFee;
_marketingFee = _buyMarketingFee;
_burnFee = _buyBurnFee;
_buybackFee = _buyBuybackFee;
} else if (to == pancakePair) { // Sell
_taxFee = _sellTaxFee;
_liquidityFee = _sellLiquidityFee;
_marketingFee = _sellMarketingFee;
_burnFee = _sellBurnFee;
_buybackFee = _sellBuybackFee;
} else { // other
_taxFee = _buyTaxFee;
_liquidityFee = _buyLiquidityFee;
_marketingFee = _buyMarketingFee;
_burnFee = _buyBurnFee;
_buybackFee = _buyBuybackFee;
}
}
_tokenTransfer(from, to, amount, takeFee);
}
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 _getValues(uint256 tAmount) private view returns (rValues memory, tValues memory) {
tValues memory _tv = _getTValues(tAmount);
rValues memory _rv = _getRValues(tAmount, _tv.tFee, _tv.tLiquidity, _tv.tMarketingFee, _tv.tBurnFee, _tv.tBuybackFee, _getRate());
return (_rv, _tv);
}
function _getTValues(uint256 tAmount) private view returns (tValues memory) {
tValues memory _tv;
_tv.tFee = calculateTaxFee(tAmount);
_tv.tLiquidity = calculateLiquidityFee(tAmount);
_tv.tMarketingFee = calculateMarketingFee(tAmount);
_tv.tBurnFee = calculateBurnFee(tAmount);
_tv.tBuybackFee = calculateBuybackFee(tAmount);
_tv.tTransferAmount = tAmount.sub(_tv.tFee).sub(_tv.tLiquidity).sub(_tv.tMarketingFee).sub(_tv.tBurnFee).sub(_tv.tBuybackFee);
return (_tv);
}
function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLiquidity, uint256 tMarketingFee, uint256 tBurnFee, uint256 tBuybackFee, uint256 currentRate) private pure returns (rValues memory) {
rValues memory _rv;
_rv.rAmount = tAmount.mul(currentRate);
_rv.rFee = tFee.mul(currentRate);
_rv.rLiquidity = tLiquidity.mul(currentRate);
_rv.rMarketingFee = tMarketingFee.mul(currentRate);
_rv.rBurnFee = tBurnFee.mul(currentRate);
_rv.rBuybackFee = tBuybackFee.mul(currentRate);
_rv.rTransferAmount = _rv.rAmount.sub(_rv.rFee).sub(_rv.rLiquidity).sub(_rv.rBurnFee).sub(_rv.rBuybackFee);
return (_rv);
}
function _getRate() private view returns (uint256) {
(uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
return rSupply.div(tSupply);
}
function _getCurrentSupply() private view returns (uint256, uint256) {
uint256 rSupply = _rTotalSupply;
uint256 tSupply = _tTotalSupply;
for (uint256 i = 0; i < _excluded.length; i++) {
if (_rBalances[_excluded[i]] > rSupply || _tBalances[_excluded[i]] > tSupply) return (_rTotalSupply, _tTotalSupply);
rSupply = rSupply.sub(_rBalances[_excluded[i]]);
tSupply = tSupply.sub(_tBalances[_excluded[i]]);
}
if (rSupply < _rTotalSupply.div(_tTotalSupply)) return (_rTotalSupply, _tTotalSupply);
return (rSupply, tSupply);
}
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 calculateMarketingFee(uint256 _amount) private view returns (uint256) {
return _amount.mul(_marketingFee).div(10**2);
}
function calculateBurnFee(uint256 _amount) private view returns (uint256) {
return _amount.mul(_burnFee).div(10**2);
}
function calculateBuybackFee(uint256 _amount) private view returns (uint256) {
return _amount.mul(_buybackFee).div(10**2);
}
function swapTokens(uint256 marketingTokensIn) private {
swapTokensForBNB(marketingTokensIn);
// swapTokensForBNB(contractTokenBalance);
uint256 contractETHBalance = address(this).balance;
if(contractETHBalance > 0) {
sendETHToFee(address(this).balance);
}
}
function sendETHToFee(uint256 amount) private {
marketingWallet.transfer(amount);
}
function swapTokensForBNB(uint256 tokenAmount) private {
// generate the pancake pair path of token -> wbnb
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = pancakeRouter.WETH();
_approve(address(this), address(pancakeRouter), tokenAmount);
// make the swap
pancakeRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of BNB
path,
address(this),
block.timestamp
);
}
function swapBNBForTokens(uint256 amount) private {
// generate the uniswap pair path of token -> weth
address[] memory path = new address[](2);
path[0] = pancakeRouter.WETH();
path[1] = address(this);
// make the swap
pancakeRouter.swapExactETHForTokensSupportingFeeOnTransferTokens{
value: amount
}(
0, // accept any amount of Tokens
path,
burnWallet, // dead address
block.timestamp.add(300)
);
}
function buyBackTokens() private {
uint256 amount = address(this).balance;
if (amount > buyBackUpperLimit) {amount = buyBackUpperLimit;}
if (amount > 0) {
swapBNBForTokens(amount);
}
}
function addLiquidity(uint256 tokenAmount, uint256 bnbAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(pancakeRouter), tokenAmount);
// add the liquidity
pancakeRouter.addLiquidityETH{value: bnbAmount}( // the return values of function not will are handled
address(this),
tokenAmount,
0,
0,
address(0),
block.timestamp
);
}
function removeAllFee() private {
if (_taxFee == 0 && _liquidityFee == 0 && _marketingFee == 0 && _burnFee == 0 && _buybackFee == 0) return;
_previousTaxFee = _taxFee;
_previousLiquidityFee = _liquidityFee;
_previousMarketingFee = _marketingFee;
_previousBurnFee = _burnFee;
_previousBuybackFee = _buybackFee;
_taxFee = 0;
_liquidityFee = 0;
_marketingFee = 0;
_burnFee = 0;
_buybackFee = 0;
}
function restoreAllFee() private {
_taxFee = _previousTaxFee;
_liquidityFee = _previousLiquidityFee;
_marketingFee = _previousMarketingFee;
_burnFee = _previousBurnFee;
_buybackFee = _previousBuybackFee;
}
// this method is responsible for taking all fee, if takeFee is true
function _tokenTransfer(address sender, address recipient, uint256 amount, bool takeFee) private {
if (!takeFee) {
removeAllFee();
}
if (_isExcluded[sender] && !_isExcluded[recipient]) {
_transferFromExcluded(sender, recipient, amount);
} else if (!_isExcluded[sender] && _isExcluded[recipient]) {
_transferToExcluded(sender, recipient, amount);
} else if (_isExcluded[sender] && _isExcluded[recipient]) {
_transferBothExcluded(sender, recipient, amount);
} else {
_transferStandard(sender, recipient, amount);
}
if (!takeFee) {
restoreAllFee();
}
}
function _transferStandard(address sender, address recipient, uint256 tAmount) private {
(rValues memory _rv, tValues memory _tv) = _getValues(tAmount);
_rBalances[sender] = _rBalances[sender].sub(_rv.rAmount);
_rBalances[recipient] = _rBalances[recipient].add(_rv.rTransferAmount);
_takeLiquidity(_tv.tLiquidity);
_reflectFee(_rv.rFee, _tv.tFee);
emit Transfer(sender, recipient, _tv.tTransferAmount);
swapTokens(_tv.tMarketingFee);
// _transferMarketingFee(sender, _rv.rMarketingFee, _tv.tMarketingFee);
_transferBurnFee(sender, _rv.rBurnFee, _tv.tBurnFee);
_transferBuybackFee(sender, _rv.rBuybackFee, _tv.tBuybackFee);
}
function _transferToExcluded(address sender, address recipient, uint256 tAmount) private {
(rValues memory _rv, tValues memory _tv) = _getValues(tAmount);
_rBalances[sender] = _rBalances[sender].sub(_rv.rAmount);
_tBalances[recipient] = _tBalances[recipient].add(_tv.tTransferAmount);
_rBalances[recipient] = _rBalances[recipient].add(_rv.rTransferAmount);
_takeLiquidity(_tv.tLiquidity);
_reflectFee(_rv.rFee, _tv.tFee);
emit Transfer(sender, recipient, _tv.tTransferAmount);
swapTokens(_tv.tMarketingFee);
_transferBurnFee(sender, _rv.rBurnFee, _tv.tBurnFee);
_transferBuybackFee(sender, _rv.rBuybackFee, _tv.tBuybackFee);
}
function _transferFromExcluded(address sender, address recipient, uint256 tAmount) private {
(rValues memory _rv, tValues memory _tv) = _getValues(tAmount);
_tBalances[sender] = _tBalances[sender].sub(tAmount);
_rBalances[sender] = _rBalances[sender].sub(_rv.rAmount);
_rBalances[recipient] = _rBalances[recipient].add(_rv.rTransferAmount);
_takeLiquidity(_tv.tLiquidity);
_reflectFee(_rv.rFee, _tv.tFee);
emit Transfer(sender, recipient, _tv.tTransferAmount);
swapTokens(_tv.tMarketingFee);
_transferBurnFee(sender, _rv.rBurnFee, _tv.tBurnFee);
_transferBuybackFee(sender, _rv.rBuybackFee, _tv.tBuybackFee);
}
function _transferBothExcluded(address sender, address recipient, uint256 tAmount) private {
(rValues memory _rv, tValues memory _tv) = _getValues(tAmount);
_tBalances[sender] = _tBalances[sender].sub(tAmount);
_rBalances[sender] = _rBalances[sender].sub(_rv.rAmount);
_tBalances[recipient] = _tBalances[recipient].add(_tv.tTransferAmount);
_rBalances[recipient] = _rBalances[recipient].add(_rv.rTransferAmount);
_takeLiquidity(_tv.tLiquidity);
_reflectFee(_rv.rFee, _tv.tFee);
emit Transfer(sender, recipient, _tv.tTransferAmount);
swapTokens(_tv.tMarketingFee);
_transferBurnFee(sender, _rv.rBurnFee, _tv.tBurnFee);
_transferBuybackFee(sender, _rv.rBuybackFee, _tv.tBuybackFee);
}
function _takeLiquidity(uint256 tLiquidity) private {
uint256 rLiquidity = tLiquidity.mul(_getRate());
_rBalances[address(this)] = _rBalances[address(this)].add(rLiquidity);
if (_isExcluded[address(this)]) {
_tBalances[address(this)] = _tBalances[address(this)].add(tLiquidity);
}
}
function _reflectFee(uint256 rFee, uint256 tFee) private {
_rTotalSupply = _rTotalSupply.sub(rFee);
_tFeeTotal = _tFeeTotal.add(tFee);
}
// function _transferMarketingFee(address sender, uint256 rMarketingFee, uint256 tMarketingFee) private {
// if (_marketingFee > 0) {
// _rBalances[marketingWallet] = _rBalances[marketingWallet].add(rMarketingFee);
// emit Transfer(sender, marketingWallet, tMarketingFee);
// _tMarketingTotal = _tMarketingTotal.add(tMarketingFee);
// }
// }
function _transferBurnFee(address sender, uint256 rBurnFee, uint256 tBurnFee) private {
if (_burnFee > 0) {
_rBalances[burnWallet] = _rBalances[burnWallet].add(rBurnFee);
emit Transfer(sender, burnWallet, tBurnFee);
_tBurnTotal = _tBurnTotal.add(tBurnFee);
}
}
function _transferBuybackFee(address sender, uint256 rBuybackFee, uint256 tBuybackFee) private {
if (_buybackFee > 0) {
_rBalances[buybackWallet] = _rBalances[buybackWallet].add(rBuybackFee);
emit Transfer(sender, buybackWallet, tBuybackFee);
_tBuybackTotal = _tBuybackTotal.add(tBuybackFee);
}
}
function initialTransfer(address sender, address recipient, uint256 tAmount) private{
uint256 rTransferAmount = reflectionFromToken(tAmount,false);
_rBalances[sender] = _rBalances[sender].sub(rTransferAmount);
_rBalances[recipient] = _rBalances[recipient].add(rTransferAmount);
emit Transfer(sender, recipient, tokenFromReflection(rTransferAmount));
}
}
Environment