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- /**
- *Submitted for verification at BscScan.com on 2021-04-23
- */
- // SPDX-License-Identifier: MIT
- // File: @uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol
- pragma solidity >=0.5.0;
- interface IUniswapV2Factory {
- event PairCreated(address indexed token0, address indexed token1, address pair, uint);
- function feeTo() external view returns (address);
- function feeToSetter() external view returns (address);
- function getPair(address tokenA, address tokenB) external view returns (address pair);
- function allPairs(uint) external view returns (address pair);
- function allPairsLength() external view returns (uint);
- function createPair(address tokenA, address tokenB) external returns (address pair);
- function setFeeTo(address) external;
- function setFeeToSetter(address) external;
- }
- // File: @uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol
- pragma solidity >=0.5.0;
- interface IUniswapV2Pair {
- event Approval(address indexed owner, address indexed spender, uint value);
- event Transfer(address indexed from, address indexed to, uint value);
- function name() external pure returns (string memory);
- function symbol() external pure returns (string memory);
- function decimals() external pure returns (uint8);
- function totalSupply() external view returns (uint);
- function balanceOf(address owner) external view returns (uint);
- function allowance(address owner, address spender) external view returns (uint);
- function approve(address spender, uint value) external returns (bool);
- function transfer(address to, uint value) external returns (bool);
- function transferFrom(address from, address to, uint value) external returns (bool);
- function DOMAIN_SEPARATOR() external view returns (bytes32);
- function PERMIT_TYPEHASH() external pure returns (bytes32);
- function nonces(address owner) external view returns (uint);
- function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
- event Mint(address indexed sender, uint amount0, uint amount1);
- event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
- event Swap(
- address indexed sender,
- uint amount0In,
- uint amount1In,
- uint amount0Out,
- uint amount1Out,
- address indexed to
- );
- event Sync(uint112 reserve0, uint112 reserve1);
- function MINIMUM_LIQUIDITY() external pure returns (uint);
- function factory() external view returns (address);
- function token0() external view returns (address);
- function token1() external view returns (address);
- function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
- function price0CumulativeLast() external view returns (uint);
- function price1CumulativeLast() external view returns (uint);
- function kLast() external view returns (uint);
- function mint(address to) external returns (uint liquidity);
- function burn(address to) external returns (uint amount0, uint amount1);
- function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
- function skim(address to) external;
- function sync() external;
- function initialize(address, address) external;
- }
- // File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router01.sol
- pragma solidity >=0.6.2;
- interface IUniswapV2Router01 {
- function factory() external pure returns (address);
- function WETH() external pure returns (address);
- function addLiquidity(
- address tokenA,
- address tokenB,
- uint amountADesired,
- uint amountBDesired,
- uint amountAMin,
- uint amountBMin,
- address to,
- uint deadline
- ) external returns (uint amountA, uint amountB, uint liquidity);
- function addLiquidityETH(
- address token,
- uint amountTokenDesired,
- uint amountTokenMin,
- uint amountETHMin,
- address to,
- uint deadline
- ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
- function removeLiquidity(
- address tokenA,
- address tokenB,
- uint liquidity,
- uint amountAMin,
- uint amountBMin,
- address to,
- uint deadline
- ) external returns (uint amountA, uint amountB);
- function removeLiquidityETH(
- address token,
- uint liquidity,
- uint amountTokenMin,
- uint amountETHMin,
- address to,
- uint deadline
- ) external returns (uint amountToken, uint amountETH);
- function removeLiquidityWithPermit(
- address tokenA,
- address tokenB,
- uint liquidity,
- uint amountAMin,
- uint amountBMin,
- address to,
- uint deadline,
- bool approveMax, uint8 v, bytes32 r, bytes32 s
- ) external returns (uint amountA, uint amountB);
- function removeLiquidityETHWithPermit(
- address token,
- uint liquidity,
- uint amountTokenMin,
- uint amountETHMin,
- address to,
- uint deadline,
- bool approveMax, uint8 v, bytes32 r, bytes32 s
- ) external returns (uint amountToken, uint amountETH);
- function swapExactTokensForTokens(
- uint amountIn,
- uint amountOutMin,
- address[] calldata path,
- address to,
- uint deadline
- ) external returns (uint[] memory amounts);
- function swapTokensForExactTokens(
- uint amountOut,
- uint amountInMax,
- address[] calldata path,
- address to,
- uint deadline
- ) external returns (uint[] memory amounts);
- function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
- external
- payable
- returns (uint[] memory amounts);
- function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
- external
- returns (uint[] memory amounts);
- function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
- external
- returns (uint[] memory amounts);
- function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
- external
- payable
- returns (uint[] memory amounts);
- function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
- function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
- function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
- function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
- function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
- }
- // File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol
- pragma solidity >=0.6.2;
- interface IUniswapV2Router02 is IUniswapV2Router01 {
- function removeLiquidityETHSupportingFeeOnTransferTokens(
- address token,
- uint liquidity,
- uint amountTokenMin,
- uint amountETHMin,
- address to,
- uint deadline
- ) external returns (uint amountETH);
- function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
- address token,
- uint liquidity,
- uint amountTokenMin,
- uint amountETHMin,
- address to,
- uint deadline,
- bool approveMax, uint8 v, bytes32 r, bytes32 s
- ) external returns (uint amountETH);
- function swapExactTokensForTokensSupportingFeeOnTransferTokens(
- uint amountIn,
- uint amountOutMin,
- address[] calldata path,
- address to,
- uint deadline
- ) external;
- function swapExactETHForTokensSupportingFeeOnTransferTokens(
- uint amountOutMin,
- address[] calldata path,
- address to,
- uint deadline
- ) external payable;
- function swapExactTokensForETHSupportingFeeOnTransferTokens(
- uint amountIn,
- uint amountOutMin,
- address[] calldata path,
- address to,
- uint deadline
- ) external;
- }
- // File: @openzeppelin/contracts/utils/ReentrancyGuard.sol
- pragma solidity >=0.6.0 <0.8.0;
- /**
- * @dev Contract module that helps prevent reentrant calls to a function.
- *
- * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
- * available, which can be applied to functions to make sure there are no nested
- * (reentrant) calls to them.
- *
- * Note that because there is a single `nonReentrant` guard, functions marked as
- * `nonReentrant` may not call one another. This can be worked around by making
- * those functions `private`, and then adding `external` `nonReentrant` entry
- * points to them.
- *
- * TIP: If you would like to learn more about reentrancy and alternative ways
- * to protect against it, check out our blog post
- * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
- */
- abstract contract ReentrancyGuard {
- // Booleans are more expensive than uint256 or any type that takes up a full
- // word because each write operation emits an extra SLOAD to first read the
- // slot's contents, replace the bits taken up by the boolean, and then write
- // back. This is the compiler's defense against contract upgrades and
- // pointer aliasing, and it cannot be disabled.
- // The values being non-zero value makes deployment a bit more expensive,
- // but in exchange the refund on every call to nonReentrant will be lower in
- // amount. Since refunds are capped to a percentage of the total
- // transaction's gas, it is best to keep them low in cases like this one, to
- // increase the likelihood of the full refund coming into effect.
- uint256 private constant _NOT_ENTERED = 1;
- uint256 private constant _ENTERED = 2;
- uint256 private _status;
- constructor () internal {
- _status = _NOT_ENTERED;
- }
- /**
- * @dev Prevents a contract from calling itself, directly or indirectly.
- * Calling a `nonReentrant` function from another `nonReentrant`
- * function is not supported. It is possible to prevent this from happening
- * by making the `nonReentrant` function external, and make it call a
- * `private` function that does the actual work.
- */
- 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;
- }
- }
- // File: @openzeppelin/contracts/utils/Context.sol
- pragma solidity >=0.6.0 <0.8.0;
- /*
- * @dev Provides information about the current execution context, including the
- * sender of the transaction and its data. While these are generally available
- * via msg.sender and msg.data, they should not be accessed in such a direct
- * manner, since when dealing with GSN 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 payable) {
- return msg.sender;
- }
- function _msgData() internal view virtual returns (bytes memory) {
- this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
- return msg.data;
- }
- }
- // File: @openzeppelin/contracts/access/Ownable.sol
- pragma solidity >=0.6.0 <0.8.0;
- /**
- * @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 () internal {
- address msgSender = _msgSender();
- _owner = msgSender;
- emit OwnershipTransferred(address(0), msgSender);
- }
- /**
- * @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 Leaves the contract without owner. It will not be possible to call
- * `onlyOwner` functions anymore. Can only be called by the current owner.
- *
- * NOTE: Renouncing ownership will leave the contract without an owner,
- * thereby removing any functionality that is only available to the owner.
- */
- function renounceOwnership() public virtual onlyOwner {
- emit OwnershipTransferred(_owner, address(0));
- _owner = address(0);
- }
- /**
- * @dev Transfers ownership of the contract to a new account (`newOwner`).
- * Can only be called by the current owner.
- */
- function transferOwnership(address newOwner) public virtual onlyOwner {
- require(newOwner != address(0), "Ownable: new owner is the zero address");
- emit OwnershipTransferred(_owner, newOwner);
- _owner = newOwner;
- }
- }
- // File: contracts/libs/IKudexReferral.sol
- pragma solidity 0.6.12;
- interface IKudexReferral {
- /**
- * @dev Record referral.
- */
- function recordReferral(address user, address referrer) external;
- /**
- * @dev Record referral commission.
- */
- function recordReferralCommission(address referrer, uint256 commission) external;
- /**
- * @dev Get the referrer address that referred the user.
- */
- function getReferrer(address user) external view returns (address);
- }
- // File: @openzeppelin/contracts/utils/Address.sol
- pragma solidity >=0.6.2 <0.8.0;
- /**
- * @dev Collection of functions related to the address type
- */
- 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;
- // solhint-disable-next-line no-inline-assembly
- 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");
- // 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");
- require(isContract(target), "Address: call to non-contract");
- // solhint-disable-next-line avoid-low-level-calls
- (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");
- // solhint-disable-next-line avoid-low-level-calls
- (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");
- // solhint-disable-next-line avoid-low-level-calls
- (bool success, bytes memory returndata) = target.delegatecall(data);
- return _verifyCallResult(success, returndata, errorMessage);
- }
- function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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
- // solhint-disable-next-line no-inline-assembly
- assembly {
- let returndata_size := mload(returndata)
- revert(add(32, returndata), returndata_size)
- }
- } else {
- revert(errorMessage);
- }
- }
- }
- }
- // File: contracts/libs/SafeKRC20.sol
- pragma solidity ^0.6.0;
- /**
- * @title SafeKRC20
- * @dev Wrappers around KRC20 operations that throw on failure (when the token
- * contract returns false). Tokens that return no value (and instead revert or
- * throw on failure) are also supported, non-reverting calls are assumed to be
- * successful.
- * To use this library you can add a `using SafeKRC20 for IKRC20;` statement to your contract,
- * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
- */
- library SafeKRC20 {
- using SafeMath for uint256;
- using Address for address;
- function safeTransfer(
- IKRC20 token,
- address to,
- uint256 value
- ) internal {
- _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
- }
- function safeTransferFrom(
- IKRC20 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
- * {IKRC20-approve}, and its usage is discouraged.
- *
- * Whenever possible, use {safeIncreaseAllowance} and
- * {safeDecreaseAllowance} instead.
- */
- function safeApprove(
- IKRC20 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),
- "SafeKRC20: approve from non-zero to non-zero allowance"
- );
- _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
- }
- function safeIncreaseAllowance(
- IKRC20 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(
- IKRC20 token,
- address spender,
- uint256 value
- ) internal {
- uint256 newAllowance = token.allowance(address(this), spender).sub(
- value,
- "SafeKRC20: 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(IKRC20 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, "SafeKRC20: low-level call failed");
- if (returndata.length > 0) {
- // Return data is optional
- // solhint-disable-next-line max-line-length
- require(abi.decode(returndata, (bool)), "SafeKRC20: KRC20 operation did not succeed");
- }
- }
- }
- // File: contracts/libs/IKRC20.sol
- pragma solidity >=0.4.0;
- interface IKRC20 {
- /**
- * @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);
- }
- // File: @openzeppelin/contracts/math/SafeMath.sol
- pragma solidity >=0.6.0 <0.8.0;
- /**
- * @dev Wrappers over Solidity's arithmetic operations with added overflow
- * checks.
- *
- * Arithmetic operations in Solidity wrap on overflow. This can easily result
- * in bugs, because programmers usually assume that an overflow raises an
- * error, which is the standard behavior in high level programming languages.
- * `SafeMath` restores this intuition by reverting the transaction when an
- * operation overflows.
- *
- * Using this library instead of the unchecked operations eliminates an entire
- * class of bugs, so it's recommended to use it always.
- */
- library SafeMath {
- /**
- * @dev Returns the addition of two unsigned integers, with an overflow flag.
- *
- * _Available since v3.4._
- */
- function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
- 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) {
- 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) {
- // 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) {
- 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) {
- 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) {
- 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) {
- require(b <= a, "SafeMath: subtraction overflow");
- 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) {
- 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, reverting 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) {
- require(b > 0, "SafeMath: division by zero");
- 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) {
- require(b > 0, "SafeMath: modulo by zero");
- 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) {
- 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.
- *
- * CAUTION: This function is deprecated because it requires allocating memory for the error
- * message unnecessarily. For custom revert reasons use {tryDiv}.
- *
- * 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);
- 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) {
- require(b > 0, errorMessage);
- return a % b;
- }
- }
- // File: contracts/libs/KRC20.sol
- pragma solidity >=0.4.0;
- /**
- * @dev Implementation of the {IKRC20} interface.
- *
- * This implementation is agnostic to the way tokens are created. This means
- * that a supply mechanism has to be added in a derived contract using {_mint}.
- * For a generic mechanism see {KRC20PresetMinterPauser}.
- *
- * TIP: For a detailed writeup see our guide
- * https://forum.zeppelin.solutions/t/how-to-implement-KRC20-supply-mechanisms/226[How
- * to implement supply mechanisms].
- *
- * We have followed general OpenZeppelin guidelines: functions revert instead
- * of returning `false` on failure. This behavior is nonetheless conventional
- * and does not conflict with the expectations of KRC20 applications.
- *
- * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
- * This allows applications to reconstruct the allowance for all accounts just
- * by listening to said events. Other implementations of the EIP may not emit
- * these events, as it isn't required by the specification.
- *
- * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
- * functions have been added to mitigate the well-known issues around setting
- * allowances. See {IKRC20-approve}.
- */
- contract KRC20 is Context, IKRC20, 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) public {
- _name = name;
- _symbol = symbol;
- _decimals = 18;
- }
- /**
- * @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 {KRC20-totalSupply}.
- */
- function totalSupply() public override view returns (uint256) {
- return _totalSupply;
- }
- /**
- * @dev See {KRC20-balanceOf}.
- */
- function balanceOf(address account) public override view returns (uint256) {
- return _balances[account];
- }
- /**
- * @dev See {KRC20-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 {KRC20-allowance}.
- */
- function allowance(address owner, address spender) public override view returns (uint256) {
- return _allowances[owner][spender];
- }
- /**
- * @dev See {KRC20-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 {KRC20-transferFrom}.
- *
- * Emits an {Approval} event indicating the updated allowance. This is not
- * required by the EIP. See the note at the beginning of {KRC20};
- *
- * 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, "KRC20: 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 {KRC20-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 {KRC20-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, "KRC20: decreased allowance below zero")
- );
- return true;
- }
- /**
- * @dev Creates `amount` tokens and assigns them to `msg.sender`, increasing
- * the total supply.
- *
- * Requirements
- *
- * - `msg.sender` must be the token owner
- */
- function mint(uint256 amount) public onlyOwner returns (bool) {
- _mint(_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), "KRC20: transfer from the zero address");
- require(recipient != address(0), "KRC20: transfer to the zero address");
- _balances[sender] = _balances[sender].sub(amount, "KRC20: 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), "KRC20: 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), "KRC20: burn from the zero address");
- _balances[account] = _balances[account].sub(amount, "KRC20: 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), "KRC20: approve from the zero address");
- require(spender != address(0), "KRC20: 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, "KRC20: burn amount exceeds allowance")
- );
- }
- }
- // File: contracts/KudexToken.sol
- pragma solidity 0.6.12;
- // KudexToken with Governance.
- contract KudexToken is KRC20 {
- // Transfer tax rate in basis points. (default 5%)
- uint16 public transferTaxRate = 500;
- // Burn rate % of transfer tax. (default 20% x 5% = 1% of total amount).
- uint16 public burnRate = 20;
- // Max transfer tax rate: 10%.
- uint16 public constant MAXIMUM_TRANSFER_TAX_RATE = 1000;
- // Burn address
- address public constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;
- // Max transfer amount rate in basis points. (default is 0.5% of total supply)
- uint16 public maxTransferAmountRate = 50;
- // Addresses that excluded from antiWhale
- mapping(address => bool) private _excludedFromAntiWhale;
- // Automatic swap and liquify enabled
- bool public swapAndLiquifyEnabled = false;
- // Min amount to liquify. (default 500 KUDs)
- uint256 public minAmountToLiquify = 500 ether;
- // The swap router, modifiable. Will be changed to KudexSwap's router when our own AMM release
- IUniswapV2Router02 public kudexSwapRouter;
- // The trading pair
- address public kudexSwapPair;
- // In swap and liquify
- bool private _inSwapAndLiquify;
- // The operator can only update the transfer tax rate
- address private _operator;
- // Events
- event OperatorTransferred(address indexed previousOperator, address indexed newOperator);
- event TransferTaxRateUpdated(address indexed operator, uint256 previousRate, uint256 newRate);
- event BurnRateUpdated(address indexed operator, uint256 previousRate, uint256 newRate);
- event MaxTransferAmountRateUpdated(address indexed operator, uint256 previousRate, uint256 newRate);
- event SwapAndLiquifyEnabledUpdated(address indexed operator, bool enabled);
- event MinAmountToLiquifyUpdated(address indexed operator, uint256 previousAmount, uint256 newAmount);
- event KudexSwapRouterUpdated(address indexed operator, address indexed router, address indexed pair);
- event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived, uint256 tokensIntoLiqudity);
- modifier onlyOperator() {
- require(_operator == msg.sender, "operator: caller is not the operator");
- _;
- }
- modifier antiWhale(address sender, address recipient, uint256 amount) {
- if (maxTransferAmount() > 0) {
- if (
- _excludedFromAntiWhale[sender] == false
- && _excludedFromAntiWhale[recipient] == false
- ) {
- require(amount <= maxTransferAmount(), "KUDEX::antiWhale: Transfer amount exceeds the maxTransferAmount");
- }
- }
- _;
- }
- modifier lockTheSwap {
- _inSwapAndLiquify = true;
- _;
- _inSwapAndLiquify = false;
- }
- modifier transferTaxFree {
- uint16 _transferTaxRate = transferTaxRate;
- transferTaxRate = 0;
- _;
- transferTaxRate = _transferTaxRate;
- }
- /**
- * @notice Constructs the KudexToken contract.
- */
- constructor() public KRC20("Kudex Token", "KUD") {
- _operator = _msgSender();
- emit OperatorTransferred(address(0), _operator);
- _excludedFromAntiWhale[msg.sender] = true;
- _excludedFromAntiWhale[address(0)] = true;
- _excludedFromAntiWhale[address(this)] = true;
- _excludedFromAntiWhale[BURN_ADDRESS] = true;
- }
- /// @notice Creates `_amount` token to `_to`. Must only be called by the owner (MasterChef).
- function mint(address _to, uint256 _amount) public onlyOwner {
- _mint(_to, _amount);
- _moveDelegates(address(0), _delegates[_to], _amount);
- }
- /// @dev overrides transfer function to meet tokenomics of KUD
- function _transfer(address sender, address recipient, uint256 amount) internal virtual override antiWhale(sender, recipient, amount) {
- // swap and liquify
- if (
- swapAndLiquifyEnabled == true
- && _inSwapAndLiquify == false
- && address(kudexSwapRouter) != address(0)
- && kudexSwapPair != address(0)
- && sender != kudexSwapPair
- && sender != owner()
- ) {
- swapAndLiquify();
- }
- if (recipient == BURN_ADDRESS || transferTaxRate == 0) {
- super._transfer(sender, recipient, amount);
- } else {
- // default tax is 5% of every transfer
- uint256 taxAmount = amount.mul(transferTaxRate).div(10000);
- uint256 burnAmount = taxAmount.mul(burnRate).div(100);
- uint256 liquidityAmount = taxAmount.sub(burnAmount);
- require(taxAmount == burnAmount + liquidityAmount, "KUD::transfer: Burn value invalid");
- // default 95% of transfer sent to recipient
- uint256 sendAmount = amount.sub(taxAmount);
- require(amount == sendAmount + taxAmount, "KUD::transfer: Tax value invalid");
- super._transfer(sender, BURN_ADDRESS, burnAmount);
- super._transfer(sender, address(this), liquidityAmount);
- super._transfer(sender, recipient, sendAmount);
- amount = sendAmount;
- }
- }
- /// @dev Swap and liquify
- function swapAndLiquify() private lockTheSwap transferTaxFree {
- uint256 contractTokenBalance = balanceOf(address(this));
- uint256 maxTransferAmount = maxTransferAmount();
- contractTokenBalance = contractTokenBalance > maxTransferAmount ? maxTransferAmount : contractTokenBalance;
- if (contractTokenBalance >= minAmountToLiquify) {
- // only min amount to liquify
- uint256 liquifyAmount = minAmountToLiquify;
- // split the liquify amount into halves
- uint256 half = liquifyAmount.div(2);
- uint256 otherHalf = liquifyAmount.sub(half);
- // capture the contract's current ETH balance.
- // this is so that we can capture exactly the amount of ETH that the
- // swap creates, and not make the liquidity event include any ETH that
- // has been manually sent to the contract
- uint256 initialBalance = address(this).balance;
- // swap tokens for ETH
- swapTokensForEth(half);
- // how much ETH did we just swap into?
- uint256 newBalance = address(this).balance.sub(initialBalance);
- // add liquidity
- addLiquidity(otherHalf, newBalance);
- emit SwapAndLiquify(half, newBalance, otherHalf);
- }
- }
- /// @dev Swap tokens for eth
- function swapTokensForEth(uint256 tokenAmount) private {
- // generate the kudexSwap pair path of token -> weth
- address[] memory path = new address[](2);
- path[0] = address(this);
- path[1] = kudexSwapRouter.WETH();
- _approve(address(this), address(kudexSwapRouter), tokenAmount);
- // make the swap
- kudexSwapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
- tokenAmount,
- 0, // accept any amount of ETH
- path,
- address(this),
- block.timestamp
- );
- }
- /// @dev Add liquidity
- function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
- // approve token transfer to cover all possible scenarios
- _approve(address(this), address(kudexSwapRouter), tokenAmount);
- // add the liquidity
- kudexSwapRouter.addLiquidityETH{value: ethAmount}(
- address(this),
- tokenAmount,
- 0, // slippage is unavoidable
- 0, // slippage is unavoidable
- operator(),
- block.timestamp
- );
- }
- /**
- * @dev Returns the max transfer amount.
- */
- function maxTransferAmount() public view returns (uint256) {
- return totalSupply().mul(maxTransferAmountRate).div(10000);
- }
- /**
- * @dev Returns the address is excluded from antiWhale or not.
- */
- function isExcludedFromAntiWhale(address _account) public view returns (bool) {
- return _excludedFromAntiWhale[_account];
- }
- // To receive BNB from kudexSwapRouter when swapping
- receive() external payable {}
- /**
- * @dev Update the transfer tax rate.
- * Can only be called by the current operator.
- */
- function updateTransferTaxRate(uint16 _transferTaxRate) public onlyOperator {
- require(_transferTaxRate <= MAXIMUM_TRANSFER_TAX_RATE, "KUD::updateTransferTaxRate: Transfer tax rate must not exceed the maximum rate.");
- emit TransferTaxRateUpdated(msg.sender, transferTaxRate, _transferTaxRate);
- transferTaxRate = _transferTaxRate;
- }
- /**
- * @dev Update the burn rate.
- * Can only be called by the current operator.
- */
- function updateBurnRate(uint16 _burnRate) public onlyOperator {
- require(_burnRate <= 100, "KUD::updateBurnRate: Burn rate must not exceed the maximum rate.");
- emit BurnRateUpdated(msg.sender, burnRate, _burnRate);
- burnRate = _burnRate;
- }
- /**
- * @dev Update the max transfer amount rate.
- * Can only be called by the current operator.
- */
- function updateMaxTransferAmountRate(uint16 _maxTransferAmountRate) public onlyOperator {
- require(_maxTransferAmountRate <= 10000, "KUD::updateMaxTransferAmountRate: Max transfer amount rate must not exceed the maximum rate.");
- emit MaxTransferAmountRateUpdated(msg.sender, maxTransferAmountRate, _maxTransferAmountRate);
- maxTransferAmountRate = _maxTransferAmountRate;
- }
- /**
- * @dev Update the min amount to liquify.
- * Can only be called by the current operator.
- */
- function updateMinAmountToLiquify(uint256 _minAmount) public onlyOperator {
- emit MinAmountToLiquifyUpdated(msg.sender, minAmountToLiquify, _minAmount);
- minAmountToLiquify = _minAmount;
- }
- /**
- * @dev Exclude or include an address from antiWhale.
- * Can only be called by the current operator.
- */
- function setExcludedFromAntiWhale(address _account, bool _excluded) public onlyOperator {
- _excludedFromAntiWhale[_account] = _excluded;
- }
- /**
- * @dev Update the swapAndLiquifyEnabled.
- * Can only be called by the current operator.
- */
- function updateSwapAndLiquifyEnabled(bool _enabled) public onlyOperator {
- emit SwapAndLiquifyEnabledUpdated(msg.sender, _enabled);
- swapAndLiquifyEnabled = _enabled;
- }
- /**
- * @dev Update the swap router.
- * Can only be called by the current operator.
- */
- function updateKudexSwapRouter(address _router) public onlyOperator {
- kudexSwapRouter = IUniswapV2Router02(_router);
- kudexSwapPair = IUniswapV2Factory(kudexSwapRouter.factory()).getPair(address(this), kudexSwapRouter.WETH());
- require(kudexSwapPair != address(0), "KUD::updateKudexSwapRouter: Invalid pair address.");
- emit KudexSwapRouterUpdated(msg.sender, address(kudexSwapRouter), kudexSwapPair);
- }
- /**
- * @dev Returns the address of the current operator.
- */
- function operator() public view returns (address) {
- return _operator;
- }
- /**
- * @dev Transfers operator of the contract to a new account (`newOperator`).
- * Can only be called by the current operator.
- */
- function transferOperator(address newOperator) public onlyOperator {
- require(newOperator != address(0), "KUD::transferOperator: new operator is the zero address");
- emit OperatorTransferred(_operator, newOperator);
- _operator = newOperator;
- }
- // Copied and modified from YAM code:
- // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernanceStorage.sol
- // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernance.sol
- // Which is copied and modified from COMPOUND:
- // https://github.com/compound-finance/compound-protocol/blob/master/contracts/Governance/Comp.sol
- /// @dev A record of each accounts delegate
- mapping (address => address) internal _delegates;
- /// @notice A checkpoint for marking number of votes from a given block
- struct Checkpoint {
- uint32 fromBlock;
- uint256 votes;
- }
- /// @notice A record of votes checkpoints for each account, by index
- mapping (address => mapping (uint32 => Checkpoint)) public checkpoints;
- /// @notice The number of checkpoints for each account
- mapping (address => uint32) public numCheckpoints;
- /// @notice The EIP-712 typehash for the contract's domain
- bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");
- /// @notice The EIP-712 typehash for the delegation struct used by the contract
- bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");
- /// @notice A record of states for signing / validating signatures
- mapping (address => uint) public nonces;
- /// @notice An event thats emitted when an account changes its delegate
- event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);
- /// @notice An event thats emitted when a delegate account's vote balance changes
- event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);
- /**
- * @notice Delegate votes from `msg.sender` to `delegatee`
- * @param delegator The address to get delegatee for
- */
- function delegates(address delegator)
- external
- view
- returns (address)
- {
- return _delegates[delegator];
- }
- /**
- * @notice Delegate votes from `msg.sender` to `delegatee`
- * @param delegatee The address to delegate votes to
- */
- function delegate(address delegatee) external {
- return _delegate(msg.sender, delegatee);
- }
- /**
- * @notice Delegates votes from signatory to `delegatee`
- * @param delegatee The address to delegate votes to
- * @param nonce The contract state required to match the signature
- * @param expiry The time at which to expire the signature
- * @param v The recovery byte of the signature
- * @param r Half of the ECDSA signature pair
- * @param s Half of the ECDSA signature pair
- */
- function delegateBySig(
- address delegatee,
- uint nonce,
- uint expiry,
- uint8 v,
- bytes32 r,
- bytes32 s
- )
- external
- {
- bytes32 domainSeparator = keccak256(
- abi.encode(
- DOMAIN_TYPEHASH,
- keccak256(bytes(name())),
- getChainId(),
- address(this)
- )
- );
- bytes32 structHash = keccak256(
- abi.encode(
- DELEGATION_TYPEHASH,
- delegatee,
- nonce,
- expiry
- )
- );
- bytes32 digest = keccak256(
- abi.encodePacked(
- "\x19\x01",
- domainSeparator,
- structHash
- )
- );
- address signatory = ecrecover(digest, v, r, s);
- require(signatory != address(0), "KUD::delegateBySig: invalid signature");
- require(nonce == nonces[signatory]++, "KUD::delegateBySig: invalid nonce");
- require(now <= expiry, "KUD::delegateBySig: signature expired");
- return _delegate(signatory, delegatee);
- }
- /**
- * @notice Gets the current votes balance for `account`
- * @param account The address to get votes balance
- * @return The number of current votes for `account`
- */
- function getCurrentVotes(address account)
- external
- view
- returns (uint256)
- {
- uint32 nCheckpoints = numCheckpoints[account];
- return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
- }
- /**
- * @notice Determine the prior number of votes for an account as of a block number
- * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
- * @param account The address of the account to check
- * @param blockNumber The block number to get the vote balance at
- * @return The number of votes the account had as of the given block
- */
- function getPriorVotes(address account, uint blockNumber)
- external
- view
- returns (uint256)
- {
- require(blockNumber < block.number, "KUD::getPriorVotes: not yet determined");
- uint32 nCheckpoints = numCheckpoints[account];
- if (nCheckpoints == 0) {
- return 0;
- }
- // First check most recent balance
- if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
- return checkpoints[account][nCheckpoints - 1].votes;
- }
- // Next check implicit zero balance
- if (checkpoints[account][0].fromBlock > blockNumber) {
- return 0;
- }
- uint32 lower = 0;
- uint32 upper = nCheckpoints - 1;
- while (upper > lower) {
- uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
- Checkpoint memory cp = checkpoints[account][center];
- if (cp.fromBlock == blockNumber) {
- return cp.votes;
- } else if (cp.fromBlock < blockNumber) {
- lower = center;
- } else {
- upper = center - 1;
- }
- }
- return checkpoints[account][lower].votes;
- }
- function _delegate(address delegator, address delegatee)
- internal
- {
- address currentDelegate = _delegates[delegator];
- uint256 delegatorBalance = balanceOf(delegator); // balance of underlying KUDs (not scaled);
- _delegates[delegator] = delegatee;
- emit DelegateChanged(delegator, currentDelegate, delegatee);
- _moveDelegates(currentDelegate, delegatee, delegatorBalance);
- }
- function _moveDelegates(address srcRep, address dstRep, uint256 amount) internal {
- if (srcRep != dstRep && amount > 0) {
- if (srcRep != address(0)) {
- // decrease old representative
- uint32 srcRepNum = numCheckpoints[srcRep];
- uint256 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
- uint256 srcRepNew = srcRepOld.sub(amount);
- _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
- }
- if (dstRep != address(0)) {
- // increase new representative
- uint32 dstRepNum = numCheckpoints[dstRep];
- uint256 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
- uint256 dstRepNew = dstRepOld.add(amount);
- _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
- }
- }
- }
- function _writeCheckpoint(
- address delegatee,
- uint32 nCheckpoints,
- uint256 oldVotes,
- uint256 newVotes
- )
- internal
- {
- uint32 blockNumber = safe32(block.number, "KUD::_writeCheckpoint: block number exceeds 32 bits");
- if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
- checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
- } else {
- checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
- numCheckpoints[delegatee] = nCheckpoints + 1;
- }
- emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
- }
- function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
- require(n < 2**32, errorMessage);
- return uint32(n);
- }
- function getChainId() internal pure returns (uint) {
- uint256 chainId;
- assembly { chainId := chainid() }
- return chainId;
- }
- }
- // File: contracts/MasterChef.sol
- pragma solidity 0.6.12;
- // MasterChef is the master of Kudex. He can make Kudex and he is a fair guy.
- //
- // Note that it's ownable and the owner wields tremendous power. The ownership
- // will be transferred to a governance smart contract once KUD is sufficiently
- // distributed and the community can show to govern itself.
- //
- // Have fun reading it. Hopefully it's bug-free. God bless.
- contract MasterChef is Ownable, ReentrancyGuard {
- using SafeMath for uint256;
- using SafeKRC20 for IKRC20;
- // Info of each user.
- struct UserInfo {
- uint256 amount; // How many LP tokens the user has provided.
- uint256 rewardDebt; // Reward debt. See explanation below.
- uint256 rewardLockedUp; // Reward locked up.
- uint256 nextHarvestUntil; // When can the user harvest again.
- //
- // We do some fancy math here. Basically, any point in time, the amount of KUDs
- // entitled to a user but is pending to be distributed is:
- //
- // pending reward = (user.amount * pool.accKudexPerShare) - user.rewardDebt
- //
- // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
- // 1. The pool's `accKudexPerShare` (and `lastRewardBlock`) gets updated.
- // 2. User receives the pending reward sent to his/her address.
- // 3. User's `amount` gets updated.
- // 4. User's `rewardDebt` gets updated.
- }
- // Info of each pool.
- struct PoolInfo {
- IKRC20 lpToken; // Address of LP token contract.
- uint256 allocPoint; // How many allocation points assigned to this pool. KUDs to distribute per block.
- uint256 lastRewardBlock; // Last block number that KUDs distribution occurs.
- uint256 accKudexPerShare; // Accumulated KUDs per share, times 1e12. See below.
- uint16 depositFeeBP; // Deposit fee in basis points
- uint256 harvestInterval; // Harvest interval in seconds
- }
- // The KUD TOKEN!
- KudexToken public kudex;
- // Dev address.
- address public devAddress;
- // Deposit Fee address
- address public feeAddress;
- // KUD tokens created per block.
- uint256 public kudexPerBlock;
- // Bonus muliplier for early kudex makers.
- uint256 public constant BONUS_MULTIPLIER = 1;
- // Max harvest interval: 14 days.
- uint256 public constant MAXIMUM_HARVEST_INTERVAL = 14 days;
- // Info of each pool.
- PoolInfo[] public poolInfo;
- // Info of each user that stakes LP tokens.
- mapping(uint256 => mapping(address => UserInfo)) public userInfo;
- // Total allocation points. Must be the sum of all allocation points in all pools.
- uint256 public totalAllocPoint = 0;
- // The block number when KUD mining starts.
- uint256 public startBlock;
- // Total locked up rewards
- uint256 public totalLockedUpRewards;
- // Kudex referral contract address.
- IKudexReferral public kudexReferral;
- // Referral commission rate in basis points.
- uint16 public referralCommissionRate = 100;
- // Max referral commission rate: 10%.
- uint16 public constant MAXIMUM_REFERRAL_COMMISSION_RATE = 1000;
- event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
- event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
- event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);
- event EmissionRateUpdated(address indexed caller, uint256 previousAmount, uint256 newAmount);
- event ReferralCommissionPaid(address indexed user, address indexed referrer, uint256 commissionAmount);
- event RewardLockedUp(address indexed user, uint256 indexed pid, uint256 amountLockedUp);
- constructor(
- KudexToken _kudex,
- uint256 _startBlock,
- uint256 _kudexPerBlock
- ) public {
- kudex = _kudex;
- startBlock = _startBlock;
- kudexPerBlock = _kudexPerBlock;
- devAddress = msg.sender;
- feeAddress = msg.sender;
- }
- function poolLength() external view returns (uint256) {
- return poolInfo.length;
- }
- // Add a new lp to the pool. Can only be called by the owner.
- // XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.
- function add(uint256 _allocPoint, IKRC20 _lpToken, uint16 _depositFeeBP, uint256 _harvestInterval, bool _withUpdate) public onlyOwner {
- require(_depositFeeBP <= 10000, "add: invalid deposit fee basis points");
- require(_harvestInterval <= MAXIMUM_HARVEST_INTERVAL, "add: invalid harvest interval");
- if (_withUpdate) {
- massUpdatePools();
- }
- uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
- totalAllocPoint = totalAllocPoint.add(_allocPoint);
- poolInfo.push(PoolInfo({
- lpToken: _lpToken,
- allocPoint: _allocPoint,
- lastRewardBlock: lastRewardBlock,
- accKudexPerShare: 0,
- depositFeeBP: _depositFeeBP,
- harvestInterval: _harvestInterval
- }));
- }
- // Update the given pool's KUD allocation point and deposit fee. Can only be called by the owner.
- function set(uint256 _pid, uint256 _allocPoint, uint16 _depositFeeBP, uint256 _harvestInterval, bool _withUpdate) public onlyOwner {
- require(_depositFeeBP <= 10000, "set: invalid deposit fee basis points");
- require(_harvestInterval <= MAXIMUM_HARVEST_INTERVAL, "set: invalid harvest interval");
- if (_withUpdate) {
- massUpdatePools();
- }
- totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(_allocPoint);
- poolInfo[_pid].allocPoint = _allocPoint;
- poolInfo[_pid].depositFeeBP = _depositFeeBP;
- poolInfo[_pid].harvestInterval = _harvestInterval;
- }
- // Return reward multiplier over the given _from to _to block.
- function getMultiplier(uint256 _from, uint256 _to) public pure returns (uint256) {
- return _to.sub(_from).mul(BONUS_MULTIPLIER);
- }
- // View function to see pending KUDs on frontend.
- function pendingKudex(uint256 _pid, address _user) external view returns (uint256) {
- PoolInfo storage pool = poolInfo[_pid];
- UserInfo storage user = userInfo[_pid][_user];
- uint256 accKudexPerShare = pool.accKudexPerShare;
- uint256 lpSupply = pool.lpToken.balanceOf(address(this));
- if (block.number > pool.lastRewardBlock && lpSupply != 0) {
- uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
- uint256 kudexReward = multiplier.mul(kudexPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
- accKudexPerShare = accKudexPerShare.add(kudexReward.mul(1e12).div(lpSupply));
- }
- uint256 pending = user.amount.mul(accKudexPerShare).div(1e12).sub(user.rewardDebt);
- return pending.add(user.rewardLockedUp);
- }
- // View function to see if user can harvest KUDs.
- function canHarvest(uint256 _pid, address _user) public view returns (bool) {
- UserInfo storage user = userInfo[_pid][_user];
- return block.timestamp >= user.nextHarvestUntil;
- }
- // Update reward variables for all pools. Be careful of gas spending!
- function massUpdatePools() public {
- uint256 length = poolInfo.length;
- for (uint256 pid = 0; pid < length; ++pid) {
- updatePool(pid);
- }
- }
- // Update reward variables of the given pool to be up-to-date.
- function updatePool(uint256 _pid) public {
- PoolInfo storage pool = poolInfo[_pid];
- if (block.number <= pool.lastRewardBlock) {
- return;
- }
- uint256 lpSupply = pool.lpToken.balanceOf(address(this));
- if (lpSupply == 0 || pool.allocPoint == 0) {
- pool.lastRewardBlock = block.number;
- return;
- }
- uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
- uint256 kudexReward = multiplier.mul(kudexPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
- kudex.mint(devAddress, kudexReward.div(10));
- kudex.mint(address(this), kudexReward);
- pool.accKudexPerShare = pool.accKudexPerShare.add(kudexReward.mul(1e12).div(lpSupply));
- pool.lastRewardBlock = block.number;
- }
- // Deposit LP tokens to MasterChef for KUD allocation.
- function deposit(uint256 _pid, uint256 _amount, address _referrer) public nonReentrant {
- PoolInfo storage pool = poolInfo[_pid];
- UserInfo storage user = userInfo[_pid][msg.sender];
- updatePool(_pid);
- if (_amount > 0 && address(kudexReferral) != address(0) && _referrer != address(0) && _referrer != msg.sender) {
- kudexReferral.recordReferral(msg.sender, _referrer);
- }
- payOrLockupPendingKudex(_pid);
- if (_amount > 0) {
- pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
- if (address(pool.lpToken) == address(kudex)) {
- uint256 transferTax = _amount.mul(kudex.transferTaxRate()).div(10000);
- _amount = _amount.sub(transferTax);
- }
- if (pool.depositFeeBP > 0) {
- uint256 depositFee = _amount.mul(pool.depositFeeBP).div(10000);
- pool.lpToken.safeTransfer(feeAddress, depositFee);
- user.amount = user.amount.add(_amount).sub(depositFee);
- } else {
- user.amount = user.amount.add(_amount);
- }
- }
- user.rewardDebt = user.amount.mul(pool.accKudexPerShare).div(1e12);
- emit Deposit(msg.sender, _pid, _amount);
- }
- // Withdraw LP tokens from MasterChef.
- function withdraw(uint256 _pid, uint256 _amount) public nonReentrant {
- PoolInfo storage pool = poolInfo[_pid];
- UserInfo storage user = userInfo[_pid][msg.sender];
- require(user.amount >= _amount, "withdraw: not good");
- updatePool(_pid);
- payOrLockupPendingKudex(_pid);
- if (_amount > 0) {
- user.amount = user.amount.sub(_amount);
- pool.lpToken.safeTransfer(address(msg.sender), _amount);
- }
- user.rewardDebt = user.amount.mul(pool.accKudexPerShare).div(1e12);
- emit Withdraw(msg.sender, _pid, _amount);
- }
- // Withdraw without caring about rewards. EMERGENCY ONLY.
- function emergencyWithdraw(uint256 _pid) public nonReentrant {
- PoolInfo storage pool = poolInfo[_pid];
- UserInfo storage user = userInfo[_pid][msg.sender];
- uint256 amount = user.amount;
- user.amount = 0;
- user.rewardDebt = 0;
- user.rewardLockedUp = 0;
- user.nextHarvestUntil = 0;
- pool.lpToken.safeTransfer(address(msg.sender), amount);
- emit EmergencyWithdraw(msg.sender, _pid, amount);
- }
- // Pay or lockup pending KUDs.
- function payOrLockupPendingKudex(uint256 _pid) internal {
- PoolInfo storage pool = poolInfo[_pid];
- UserInfo storage user = userInfo[_pid][msg.sender];
- if (user.nextHarvestUntil == 0) {
- user.nextHarvestUntil = block.timestamp.add(pool.harvestInterval);
- }
- uint256 pending = user.amount.mul(pool.accKudexPerShare).div(1e12).sub(user.rewardDebt);
- if (canHarvest(_pid, msg.sender)) {
- if (pending > 0 || user.rewardLockedUp > 0) {
- uint256 totalRewards = pending.add(user.rewardLockedUp);
- // reset lockup
- totalLockedUpRewards = totalLockedUpRewards.sub(user.rewardLockedUp);
- user.rewardLockedUp = 0;
- user.nextHarvestUntil = block.timestamp.add(pool.harvestInterval);
- // send rewards
- safeKudexTransfer(msg.sender, totalRewards);
- payReferralCommission(msg.sender, totalRewards);
- }
- } else if (pending > 0) {
- user.rewardLockedUp = user.rewardLockedUp.add(pending);
- totalLockedUpRewards = totalLockedUpRewards.add(pending);
- emit RewardLockedUp(msg.sender, _pid, pending);
- }
- }
- // Safe kudex transfer function, just in case if rounding error causes pool to not have enough KUDs.
- function safeKudexTransfer(address _to, uint256 _amount) internal {
- uint256 kudexBal = kudex.balanceOf(address(this));
- if (_amount > kudexBal) {
- kudex.transfer(_to, kudexBal);
- } else {
- kudex.transfer(_to, _amount);
- }
- }
- // Update dev address by the previous dev.
- function setDevAddress(address _devAddress) public {
- require(msg.sender == devAddress, "setDevAddress: FORBIDDEN");
- require(_devAddress != address(0), "setDevAddress: ZERO");
- devAddress = _devAddress;
- }
- function setFeeAddress(address _feeAddress) public {
- require(msg.sender == feeAddress, "setFeeAddress: FORBIDDEN");
- require(_feeAddress != address(0), "setFeeAddress: ZERO");
- feeAddress = _feeAddress;
- }
- // Pancake has to add hidden dummy pools in order to alter the emission, here we make it simple and transparent to all.
- function updateEmissionRate(uint256 _kudexPerBlock) public onlyOwner {
- massUpdatePools();
- emit EmissionRateUpdated(msg.sender, kudexPerBlock, _kudexPerBlock);
- kudexPerBlock = _kudexPerBlock;
- }
- // Update the kudex referral contract address by the owner
- function setKudexReferral(IKudexReferral _kudexReferral) public onlyOwner {
- kudexReferral = _kudexReferral;
- }
- // Update referral commission rate by the owner
- function setReferralCommissionRate(uint16 _referralCommissionRate) public onlyOwner {
- require(_referralCommissionRate <= MAXIMUM_REFERRAL_COMMISSION_RATE, "setReferralCommissionRate: invalid referral commission rate basis points");
- referralCommissionRate = _referralCommissionRate;
- }
- // Pay referral commission to the referrer who referred this user.
- function payReferralCommission(address _user, uint256 _pending) internal {
- if (address(kudexReferral) != address(0) && referralCommissionRate > 0) {
- address referrer = kudexReferral.getReferrer(_user);
- uint256 commissionAmount = _pending.mul(referralCommissionRate).div(10000);
- if (referrer != address(0) && commissionAmount > 0) {
- kudex.mint(referrer, commissionAmount);
- kudexReferral.recordReferralCommission(referrer, commissionAmount);
- emit ReferralCommissionPaid(_user, referrer, commissionAmount);
- }
- }
- }
- }
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