Contract Source Code:
File 1 of 1 : CandyToken
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;
contract Context {
// Empty internal constructor, to prevent people from mistakenly deploying
// an instance of this contract, which should be used via inheritance.
constructor() internal {}
function _msgSender() internal view returns (address payable) {
return 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;
}
}
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() internal {
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 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 {
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
*/
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0), 'Ownable: new owner is the zero address');
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the token decimals.
*/
function decimals() external view returns (uint8);
/**
* @dev Returns the token symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the token name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the bep token owner.
*/
function getOwner() external view returns (address);
/**
* @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 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 `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 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);
}
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;
}
function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
z = x < y ? x : y;
}
// babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
function sqrt(uint256 y) internal pure returns (uint256 z) {
if (y > 3) {
z = y;
uint256 x = y / 2 + 1;
while (x < z) {
z = x;
x = (y / x + x) / 2;
}
} else if (y != 0) {
z = 1;
}
}
}
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) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly {
codehash := extcodehash(account)
}
return (codehash != accountHash && codehash != 0x0);
}
/**
* @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');
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(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');
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(
address target,
bytes memory data,
uint256 weiValue,
string memory errorMessage
) private returns (bytes memory) {
require(isContract(target), 'Address: call to non-contract');
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{value: weiValue}(data);
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
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
contract ERC20 is Context, IERC20, Ownable {
using SafeMath for uint256;
using Address for address;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name, string memory symbol, uint8 decimals) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
/**
* @dev Returns the bep token owner.
*/
function getOwner() external override view returns (address) {
return owner();
}
/**
* @dev Returns the token name.
*/
function name() public override view returns (string memory) {
return _name;
}
/**
* @dev Returns the token decimals.
*/
function decimals() public override view returns (uint8) {
return _decimals;
}
/**
* @dev Returns the token symbol.
*/
function symbol() public override view returns (string memory) {
return _symbol;
}
/**
* @dev See {ERC20-totalSupply}.
*/
function totalSupply() public override view returns (uint256) {
return _totalSupply;
}
/**
* @dev See {ERC20-balanceOf}.
*/
function balanceOf(address account) public override view returns (uint256) {
return _balances[account];
}
/**
* @dev See {ERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {ERC20-allowance}.
*/
function allowance(address owner, address spender) public override view returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {ERC20-approve}.
*
* 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 {ERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for `sender`'s tokens of at least
* `amount`.
*/
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;
}
/**
* @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 {ERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public 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 {ERC20-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 returns (bool) {
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender].sub(subtractedValue, 'ERC20: decreased allowance below zero')
);
return true;
}
/**
* @dev Destroys `amount` tokens from `msg.sender`, decreasing the total supply.
*
*/
function burn(uint256 amount) public returns (bool) {
_burn(_msgSender(), amount);
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* 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:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), 'ERC20: transfer from the zero address');
require(recipient != address(0), 'ERC20: transfer to the zero address');
_balances[sender] = _balances[sender].sub(amount, 'ERC20: transfer amount exceeds balance');
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @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
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal {
require(account != address(0), 'ERC20: mint to the zero address');
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @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 {
require(account != address(0), 'ERC20: burn from the zero address');
_balances[account] = _balances[account].sub(amount, 'ERC20: burn amount exceeds balance');
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is 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 {
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 Destroys `amount` tokens from `account`.`amount` is then deducted
* from the caller's allowance.
*
* See {_burn} and {_approve}.
*/
function _burnFrom(address account, uint256 amount) internal {
_burn(account, amount);
_approve(
account,
_msgSender(),
_allowances[account][_msgSender()].sub(amount, 'ERC20: burn amount exceeds allowance')
);
}
}
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
'SafeERC20: approve from non-zero to non-zero allowance'
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(
value,
'SafeERC20: decreased allowance below zero'
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, 'SafeERC20: low-level call failed');
if (returndata.length > 0) {
// Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), 'SafeERC20: ERC20 operation did not succeed');
}
}
}
interface IERC721Receiver {
function onERC721Received(
address operator,
address from,
uint tokenId,
bytes calldata data
) external returns (bytes4);
}
interface INonfungiblePositionManager {
struct MintParams {
address token0;
address token1;
uint24 fee;
int24 tickLower;
int24 tickUpper;
uint amount0Desired;
uint amount1Desired;
uint amount0Min;
uint amount1Min;
address recipient;
uint deadline;
}
function mint(
MintParams calldata params
)
external
payable
returns (uint tokenId, uint128 liquidity, uint amount0, uint amount1);
struct IncreaseLiquidityParams {
uint tokenId;
uint amount0Desired;
uint amount1Desired;
uint amount0Min;
uint amount1Min;
uint deadline;
}
function increaseLiquidity(
IncreaseLiquidityParams calldata params
) external payable returns (uint128 liquidity, uint amount0, uint amount1);
struct DecreaseLiquidityParams {
uint tokenId;
uint128 liquidity;
uint amount0Min;
uint amount1Min;
uint deadline;
}
function decreaseLiquidity(
DecreaseLiquidityParams calldata params
) external payable returns (uint amount0, uint amount1);
struct CollectParams {
uint tokenId;
address recipient;
uint128 amount0Max;
uint128 amount1Max;
}
function collect(
CollectParams calldata params
) external payable returns (uint amount0, uint amount1);
}
interface ISwapRouter {
struct ExactInputSingleParams {
address tokenIn;
address tokenOut;
uint24 fee;
address recipient;
uint deadline;
uint amountIn;
uint amountOutMinimum;
uint160 sqrtPriceLimitX96;
}
/// @notice Swaps amountIn of one token for as much as possible of another token
/// @param params The parameters necessary for the swap, encoded as ExactInputSingleParams in calldata
/// @return amountOut The amount of the received token
function exactInputSingle(
ExactInputSingleParams calldata params
) external payable returns (uint amountOut);
struct ExactInputParams {
bytes path;
address recipient;
uint deadline;
uint amountIn;
uint amountOutMinimum;
}
/// @notice Swaps amountIn of one token for as much as possible of another along the specified path
/// @param params The parameters necessary for the multi-hop swap, encoded as ExactInputParams in calldata
/// @return amountOut The amount of the received token
function exactInput(
ExactInputParams calldata params
) external payable returns (uint amountOut);
}
interface IUniRouterV2 {
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, uint swapFee) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut, uint swapFee) 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);
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;
}
interface IWETH is IERC20 {
function deposit() external payable;
function withdraw(uint amount) external;
}
contract CandyToken is ERC20, IERC721Receiver {
using SafeMath for uint256;
using SafeERC20 for IERC20;
address constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
IWETH weth = IWETH(WETH);
int24 private constant MIN_TICK = -887272;
int24 private constant MAX_TICK = -MIN_TICK;
int24 private constant TICK_SPACING = 60;
INonfungiblePositionManager public candySwapPositionManager;
ISwapRouter public candySwapRouter;
IUniRouterV2 public swapRouterV2;
bool public v2Active = false;
address public candySwapPool;
bool private swapping;
address payable public devmarketingWallet =
payable(0x399Db7F59a79563a1dd4a687a0dEa41BbEaA2254);
address payable public liquidityWallet =
payable(0x92D41D83e9EAc685863645A4F05e8FdDE684c74f);
uint256 public contractAmountToSwap = 100 ether;
uint256 public devmarketingFeeOnBuy = 4;
uint256 public liquidityFeeOnBuy = 1;
uint256 public totalFeesOnBuy = 5;
uint256 public devmarketingFeeOnSell = 4;
uint256 public liquidityFeeOnSell = 1;
uint256 public totalFeesOnSell = 5;
uint256 public burnTaxOnSell = 0;
uint256 public burnTaxOnBuy = 0;
uint256 public devmarketingShare = 6;
uint256 public liquidityShare = 4;
uint256 public totalShare = devmarketingShare.add(liquidityShare);
bool public SwapAndLiquifyEnabled = false;
uint256 public maxTxAmount = 1000000000 * (10**18); // Initial Max Tx Amount
uint256 public maxWalletAmount = 1000000000 * (10**18); // Initial Max Wallet Amount
// exlcude from fees and max transaction amount
mapping(address => bool) private _isExcludedFromFees;
mapping(address => bool) private _isExcludedFromMaxAmounts;
// getting fee addresses
mapping(address => bool) public _isGetFees;
// store addresses that are automated market maker pools. Any transfer to these addresses
// could be subject to a maximum transfer amount
mapping(address => bool) public automatedMarketMakerPools;
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
// Contract Events
event ExcludeFromFees(address indexed account, bool isExcluded);
event ExcludeFromMaxAmounts(address indexed account, bool isExcluded);
event GetFee(address indexed account, bool isGetFee);
event ExcludeMultipleAccountsFromFees(address[] accounts, bool isExcluded);
event SetAutomatedMarketMakerPool(address indexed pool, bool indexed value);
event DevMarketingWalletUpdated(
address indexed newDevMarketingWallet,
address indexed oldDevMarketingWallet
);
event LiquidityWalletUpdated(
address indexed newLiquidityWallet,
address indexed oldLiquidityWallet
);
event UpdateCandySwapRouter(
address indexed newAddress,
address indexed oldAddress
);
event SwapAndLiquify(
uint256 tokensSwapped,
uint256 nativeReceived,
uint256 tokensIntoLiqudity
);
event UpdateSwapAndLiquify(bool value);
event SetDevMarketingFee(uint256 onBuy, uint256 onSell);
event SetLiquidityFee(uint256 onBuy, uint256 onSell);
event SetContractAmountToSwap(uint256 contractAmountToSwap);
event UpdateMaxTxAmount(uint256 txAmount);
event UpdateMaxWalletAmount(uint256 walletAmount);
constructor() public ERC20("Candy Swap", "Candy", 18) {
_mint(owner(), 1000000000 * (10**18));
excludeFromFees(devmarketingWallet, true);
excludeFromFees(address(this), true);
excludeFromFees(owner(), true);
excludeFromMaxAmounts(devmarketingWallet, true);
excludeFromMaxAmounts(address(this), true);
excludeFromMaxAmounts(owner(), true);
_status = _NOT_ENTERED;
}
receive() external payable {}
function updatePositionManager(address _manager) external onlyOwner {
candySwapPositionManager = INonfungiblePositionManager(_manager);
}
function updateSwapRouter(address _router) external onlyOwner {
candySwapRouter = ISwapRouter(_router);
}
function updateSwapRouterV2(address _routerV2) external onlyOwner {
swapRouterV2 = IUniRouterV2(_routerV2);
}
function updateV2Active(bool _active) external onlyOwner {
v2Active = _active;
}
function onERC721Received(
address operator,
address from,
uint tokenId,
bytes calldata
) external override returns (bytes4) {
return IERC721Receiver.onERC721Received.selector;
}
function updateSwapAndLiquifiy(bool value) public onlyOwner {
SwapAndLiquifyEnabled = value;
emit UpdateSwapAndLiquify(value);
}
function setDevMarketingFee(uint256 _onBuy, uint256 _onSell)
external
onlyOwner
{
devmarketingFeeOnBuy = _onBuy;
devmarketingFeeOnSell = _onSell;
totalFeesOnBuy = devmarketingFeeOnBuy.add(liquidityFeeOnBuy);
totalFeesOnSell = devmarketingFeeOnSell.add(liquidityFeeOnSell);
uint256 maxFeeSell = 10 - burnTaxOnSell;
uint256 maxFeeBuy = 10 - burnTaxOnBuy;
require(totalFeesOnBuy <= maxFeeBuy, "Over-max-Fee");
require(totalFeesOnSell <= maxFeeSell, "Over-max-Fee");
emit SetDevMarketingFee(_onBuy, _onSell);
}
function setLiquidityFee(uint256 _onBuy, uint256 _onSell)
external
onlyOwner
{
liquidityFeeOnBuy = _onBuy;
liquidityFeeOnSell = _onSell;
totalFeesOnBuy = devmarketingFeeOnBuy.add(liquidityFeeOnBuy);
totalFeesOnSell = devmarketingFeeOnSell.add(liquidityFeeOnSell);
uint256 maxFeeSell = 10 - burnTaxOnSell;
uint256 maxFeeBuy = 10 - burnTaxOnBuy;
require(totalFeesOnBuy <= maxFeeBuy, "Over-max-Fee");
require(totalFeesOnSell <= maxFeeSell, "Over-max-Fee");
emit SetLiquidityFee(_onBuy, _onSell);
}
function setBurnTax(uint256 _onBuy, uint256 _onSell)
external
onlyOwner
{
burnTaxOnBuy = _onBuy;
burnTaxOnSell = _onSell;
uint256 maxFeeSell = 10 - burnTaxOnSell;
uint256 maxFeeBuy = 10 - burnTaxOnBuy;
require(totalFeesOnBuy <= maxFeeBuy, "Over-max-Fee");
require(totalFeesOnSell <= maxFeeSell, "Over-max-Fee");
}
function updateShares(uint256 _devmarketing, uint256 _liquidity) external onlyOwner {
devmarketingShare = _devmarketing;
liquidityShare = _liquidity;
totalShare = devmarketingShare.add(liquidityShare);
}
function excludeFromFees(address account, bool excluded) public onlyOwner {
_isExcludedFromFees[account] = excluded;
emit ExcludeFromFees(account, excluded);
}
function excludeFromMaxAmounts(address account, bool excluded) public onlyOwner {
_isExcludedFromMaxAmounts[account] = excluded;
emit ExcludeFromMaxAmounts(account, excluded);
}
function setFeeAccount(address account, bool isGetFee) public onlyOwner {
_isGetFees[account] = isGetFee;
emit GetFee(account, isGetFee);
}
function excludeMultipleAccountsFromFees(
address[] calldata accounts,
bool excluded
) public onlyOwner {
for (uint256 i = 0; i < accounts.length; i++) {
_isExcludedFromFees[accounts[i]] = excluded;
}
emit ExcludeMultipleAccountsFromFees(accounts, excluded);
}
function setAutomatedMarketMakerPool(address pool, bool value)
public
onlyOwner
{
_setAutomatedMarketMakerPool(pool, value);
}
function _setAutomatedMarketMakerPool(address pool, bool value) private {
automatedMarketMakerPools[pool] = value;
emit SetAutomatedMarketMakerPool(pool, value);
}
function setContractAmountToSwap(uint256 _amount) public onlyOwner {
contractAmountToSwap = _amount;
emit SetContractAmountToSwap(contractAmountToSwap);
}
function updateDevMarketingWallet(address newDevMarketingWallet)
public
onlyOwner
{
excludeFromFees(newDevMarketingWallet, true);
excludeFromFees(devmarketingWallet, false);
emit DevMarketingWalletUpdated(
newDevMarketingWallet,
devmarketingWallet
);
devmarketingWallet = payable(newDevMarketingWallet);
}
function updateLiquidityWallet(address newLiquidityWallet)
public
onlyOwner
{
excludeFromFees(newLiquidityWallet, true);
excludeFromFees(liquidityWallet, false);
emit LiquidityWalletUpdated(
newLiquidityWallet,
liquidityWallet
);
liquidityWallet = payable(newLiquidityWallet);
}
function updateMaxTxAmount(uint256 _amount) public onlyOwner {
maxTxAmount = _amount;
emit UpdateMaxTxAmount(_amount);
}
function updateMaxWalletAmount(uint256 _amount) public onlyOwner {
maxWalletAmount = _amount;
emit UpdateMaxWalletAmount(_amount);
}
function isExcludedFromFees(address account) public view returns (bool) {
return _isExcludedFromFees[account];
}
function isExcludedFromMaxAmounts(address account) public view returns (bool) {
return _isExcludedFromMaxAmounts[account];
}
function _transfer(
address from,
address to,
uint256 amount
) internal override {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
if (!_isExcludedFromMaxAmounts[from]) {
require(amount <= maxTxAmount, "max-tx-amount-overflow");
}
if (amount == 0) {
super._transfer(from, to, 0);
return;
}
if (SwapAndLiquifyEnabled) {
uint256 contractTokenBalance = balanceOf(address(this));
bool canSwap = contractTokenBalance >= contractAmountToSwap;
if (canSwap && !swapping && !automatedMarketMakerPools[from] && (!automatedMarketMakerPools[to] || v2Active)) {
swapping = true;
// Set number of tokens to sell to contractAmountToSwap
contractTokenBalance = contractAmountToSwap;
swapTokens(contractTokenBalance);
swapping = false;
}
}
// indicates if fee should be deducted from transfer
bool takeFee = true;
// if any account belongs to _isExcludedFromFee account then remove the fee
if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
takeFee = false;
}
if (takeFee) {
uint256 fees;
if (_isGetFees[from] || _isGetFees[to]) {
if (_isGetFees[from]) {
fees = amount.mul(totalFeesOnBuy).div(10**2);
if (burnTaxOnBuy > 0) {
uint256 burnAmount = amount.mul(burnTaxOnBuy).div(10**2);
super._transfer(from, address(this), fees.add(burnAmount));
amount = amount.sub(burnAmount);
_burn(address(this), burnAmount);
} else {
super._transfer(from, address(this), fees);
}
} else {
fees = amount.mul(totalFeesOnSell).div(10**2);
if (burnTaxOnSell > 0) {
uint256 burnAmount = amount.mul(burnTaxOnSell).div(10**2);
super._transfer(from, address(this), fees.add(burnAmount));
amount = amount.sub(burnAmount);
_burn(address(this), burnAmount);
} else {
super._transfer(from, address(this), fees);
}
}
amount = amount.sub(fees);
}
}
if (!_isExcludedFromMaxAmounts[to]) {
require(balanceOf(to).add(amount) <= maxWalletAmount, "over-max-wallet-amount");
}
super._transfer(from, to, amount);
}
function swapTokens(uint256 tokenAmount) private {
uint256 tokensForLiquidity = tokenAmount.mul(liquidityShare).div(totalShare);
uint256 swapTokenAmount = tokenAmount.sub(tokensForLiquidity);
swapTokensForNative(swapTokenAmount);
uint256 swappedNative = address(this).balance;
if (!v2Active) {
swappedNative = weth.balanceOf(address(this));
}
uint256 nativeForLiquidity = swappedNative.mul(liquidityShare).div(totalShare);
uint256 nativeForMarketing = swappedNative.sub(nativeForLiquidity);
if (nativeForMarketing > 0) {
transferNativeToDevMarketingWallet(nativeForMarketing);
}
if (nativeForLiquidity > 0) {
addLiquidity(tokensForLiquidity, nativeForLiquidity);
}
}
// Swap tokens
function swapTokensForNative(uint256 tokenAmount) private {
if (v2Active) {
// generate the sphynxswap pair path of token -> WETH
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = swapRouterV2.WETH();
_approve(address(this), address(swapRouterV2), tokenAmount);
// make the swap
swapRouterV2.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of Native
path,
address(this),
block.timestamp
);
} else {
swapTokensForNativeV3(tokenAmount);
}
}
function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
if (v2Active) {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(swapRouterV2), tokenAmount);
// add the liquidity
swapRouterV2.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
liquidityWallet,
block.timestamp
);
} else {
addLiquidityV3(tokenAmount, ethAmount);
}
}
// Swap tokens
function swapTokensForNativeV3(uint256 tokenAmount) private {
_approve(address(this), address(candySwapRouter), tokenAmount);
// make the swap
ISwapRouter.ExactInputSingleParams memory params = ISwapRouter
.ExactInputSingleParams({
tokenIn: address(this),
tokenOut: WETH,
fee: 3000,
recipient: address(this),
deadline: block.timestamp,
amountIn: tokenAmount,
amountOutMinimum: 0,
sqrtPriceLimitX96: 0
});
candySwapRouter.exactInputSingle(params);
}
function addLiquidityV3(uint256 tokenAmount, uint256 ethAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(candySwapPositionManager), tokenAmount);
weth.approve(address(candySwapPositionManager), ethAmount);
// add the liquidity
INonfungiblePositionManager.MintParams
memory params = INonfungiblePositionManager.MintParams({
token0: address(this),
token1: WETH,
fee: 3000,
tickLower: (MIN_TICK / TICK_SPACING) * TICK_SPACING,
tickUpper: (MAX_TICK / TICK_SPACING) * TICK_SPACING,
amount0Desired: tokenAmount,
amount1Desired: ethAmount,
amount0Min: 0,
amount1Min: 0,
recipient: liquidityWallet,
deadline: block.timestamp
});
candySwapPositionManager.mint(params);
}
function transferNativeToDevMarketingWallet(uint256 amount) private {
if (!v2Active) {
weth.withdraw(amount);
}
devmarketingWallet.transfer(amount);
}
function withdrawNative() external payable onlyOwner {
address payable msgSender = payable(msg.sender);
msgSender.transfer(address(this).balance);
}
function withdrawToken(address _token, uint256 _amount) external onlyOwner {
IERC20(_token).safeTransfer(msg.sender, _amount);
}
}