Contract Source Code:
//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
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);
}
}
}
}
//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
interface IERC20 {
function totalSupply() external view returns (uint256);
function symbol() external view returns(string memory);
function name() external view returns(string memory);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Returns the number of decimal places
*/
function decimals() external view returns (uint8);
/**
* @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);
}
//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
/**
* Exempt Surge Interface
*/
interface IKeysStaking {
function deposit(uint256 amount) external;
}
//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
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);
}
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;
}
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;
}
//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "./SafeMath.sol";
import "./Address.sol";
import "./IERC20.sol";
import "./ReentrantGuard.sol";
import "./IUniswapV2Router02.sol";
import "./IKeysStaking.sol";
/**
*
* KEYS Farming Contract
* Grants Passive KEYS To Users Who Stake + Lock KEYS+ETH Liquidity
* Developed by DeFi Mark (MoonMark)
*
*/
contract KEYSFarm is ReentrancyGuard, IERC20, IKeysStaking{
using SafeMath for uint256;
using Address for address;
// KEYS Contract
address constant KEYS = 0xe0a189C975e4928222978A74517442239a0b86ff;
address constant KEYS_LP = 0x5BaCB4114Ad2D448E79aDdef121714b74D67faeC;
// Uniswap Router
IUniswapV2Router02 router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
// precision factor
uint256 constant precision = 10**36;
// Total Dividends Per Farm
uint256 public dividendsPerToken;
// 88 day lock time
uint256 public lockTime = 2534400;
// 8 day harvest time
uint256 public harvestTime = 230400;
// Locker Structure
struct StakedUser {
uint256 tokensLocked;
uint256 timeLocked;
uint256 lastClaim;
uint256 totalExcluded;
}
// Users -> StakedUser
mapping ( address => StakedUser ) users;
// total locked across all lockers
uint256 totalLocked;
// reduced purchase fee
uint256 public fee = 1;
// fee for unstaking too early
uint256 public earlyFee = 8;
// multisignature wallet
address public multisig = 0xfCacEAa7b4cf845f2cfcE6a3dA680dF1BB05015c;
bool receiveDisabled;
bool refundEnabled = true;
// Ownership
address public owner;
modifier onlyOwner(){require(owner == msg.sender, 'Only Owner'); _;}
// Events
event TransferOwnership(address newOwner);
event UpdateFee(uint256 newFee);
event UpdateLockTime(uint256 newTime);
event UpdatedStakingMinimum(uint256 minimumKeys);
event UpdatedFeeReceiver(address feeReceiver);
event UpdatedEarlyFee(uint256 newFee);
event UpdatedHarvestTime(uint256 newTime);
constructor() {
owner = 0xfCacEAa7b4cf845f2cfcE6a3dA680dF1BB05015c;
}
function totalSupply() external view override returns (uint256) { return totalLocked; }
function balanceOf(address account) public view override returns (uint256) { return users[account].tokensLocked; }
function allowance(address holder, address spender) external view override returns (uint256) { return holder == spender ? balanceOf(holder) : 0; }
function name() public pure override returns (string memory) {
return "Keys Farm";
}
function symbol() public pure override returns (string memory) {
return "KEYSFARM";
}
function decimals() public pure override returns (uint8) {
return 18;
}
function approve(address spender, uint256 amount) public view override returns (bool) {
return users[msg.sender].tokensLocked >= amount && spender != msg.sender;
}
function transfer(address recipient, uint256 amount) external override returns (bool) {
// ensure claim requirements
if (recipient == KEYS) {
_unlock(msg.sender, msg.sender, amount, false);
} else {
_makeClaim(msg.sender);
}
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
if (recipient == KEYS) {
_unlock(msg.sender, msg.sender, amount, false);
} else {
_makeClaim(msg.sender);
}
return true && sender == recipient;
}
///////////////////////////////////
////// OWNER FUNCTIONS ///////
///////////////////////////////////
function transferOwnership(address newOwner) external onlyOwner {
owner = newOwner;
emit TransferOwnership(newOwner);
}
function updateFee(uint256 newFee) external onlyOwner {
require(earlyFee <= 5, 'Fee Too Large');
fee = newFee;
emit UpdateFee(newFee);
}
function setRefundEnabled(bool _refundEnabled) external onlyOwner {
refundEnabled = _refundEnabled;
}
function updateFeeReceiver(address newReceiver) external onlyOwner {
multisig = newReceiver;
emit UpdatedFeeReceiver(newReceiver);
}
function setEarlyFee(uint256 newFee) external onlyOwner {
require(earlyFee <= 30, 'Fee Too Large');
earlyFee = newFee;
emit UpdatedEarlyFee(newFee);
}
function setHarvestTime(uint256 newTime) external onlyOwner {
require(newTime <= 10**7, 'Time Too Long');
harvestTime = newTime;
emit UpdatedHarvestTime(newTime);
}
function setLockTime(uint256 newTime) external onlyOwner {
require(newTime <= 10**7, 'Lock Time Too Long');
lockTime = newTime;
emit UpdateLockTime(newTime);
}
function withdraw(bool ETH, address token, uint256 amount, address recipient) external onlyOwner {
if (ETH) {
require(address(this).balance >= amount, 'Insufficient Balance');
(bool s,) = payable(recipient).call{value: amount}("");
require(s, 'Failure on ETH Withdrawal');
} else {
require(token != KEYS_LP, 'Cannot Withdraw KEYS LP');
IERC20(token).transfer(recipient, amount);
}
}
///////////////////////////////////
////// PUBLIC FUNCTIONS ///////
///////////////////////////////////
/** Adds KEYS To The Pending Rewards Of KEYS Stakers */
function deposit(uint256 amount) external override {
uint256 received = _transferIn(KEYS, amount);
dividendsPerToken += received.mul(precision).div(totalLocked);
}
function claimReward() external nonReentrant {
_makeClaim(msg.sender);
}
function claimRewardForUser(address user) external nonReentrant {
_makeClaim(user);
}
function unlock(uint256 amount) external nonReentrant {
_unlock(msg.sender, msg.sender, amount, false);
}
function unlockFor(uint256 amount, address keysRecipient) external nonReentrant {
_unlock(msg.sender, keysRecipient, amount, false);
}
function unlockAll() external nonReentrant {
_unlock(msg.sender, msg.sender, users[msg.sender].tokensLocked, false);
}
function unstake(uint256 amount) external nonReentrant {
_unlock(msg.sender, msg.sender, amount, true);
}
function unstakeAll() external nonReentrant {
_unlock(msg.sender, msg.sender, users[msg.sender].tokensLocked, true);
}
function unstakeFor(uint256 amount, address recipient) external nonReentrant {
_unlock(msg.sender, recipient, amount, true);
}
function stakeLP(uint256 numLPTokens) external nonReentrant {
uint256 received = _transferIn(KEYS_LP, numLPTokens);
_lock(msg.sender, received);
}
function stakeKeysAndETH(uint256 numKeys) external payable nonReentrant {
require(numKeys >= 10 && msg.value >= 10**9, 'Minimum Amount');
// transfer keys in
uint256 keysReceived = _transferIn(KEYS, numKeys);
// ETH -> KEYS
address[] memory path = new address[](2);
path[0] = router.WETH();
path[1] = KEYS;
// Estimated KEYS To Receive From ETHER
uint256 estimate = router.getAmountsOut(msg.value, path)[1];
// Estimate Difference
uint256 diff = estimate < keysReceived ? keysReceived - estimate : estimate - keysReceived;
// Ensure Difference Within Bounds
require(diff <= estimate.div(20), 'Error: Over 5% Slippage Detected');
// Pair Halves Into Liquidity + Lock LP Received
_pairAndLock(keysReceived, msg.value);
}
///////////////////////////////////
////// INTERNAL FUNCTIONS ///////
///////////////////////////////////
function _pairAndLock(uint256 KEYSAmount, uint256 ethAmount) internal {
// balance of LP Tokens Before
uint256 lBefore = IERC20(KEYS_LP).balanceOf(address(this));
// approve router to move tokens
IERC20(KEYS).approve(address(router), KEYSAmount);
// check slippage
(uint256 minAmountKEYS, uint256 minETH) = (KEYSAmount.mul(75).div(100), ethAmount.mul(75).div(100));
// Disable Receive
receiveDisabled = true;
// Calculated Expected Amounts After LP Pairing
uint256 expectedKEYS = IERC20(KEYS).balanceOf(address(this)).sub(KEYSAmount, 'ERR KEYS Amount');
uint256 expectedETH = address(this).balance.sub(ethAmount, 'ERR ETH Amount');
// add liquidity
router.addLiquidityETH{value: ethAmount}(
KEYS,
KEYSAmount,
minAmountKEYS,
minETH,
address(this),
block.timestamp.add(30)
);
// Re Enable Receive
receiveDisabled = false;
uint256 KEYSAfter = IERC20(KEYS).balanceOf(address(this));
uint256 ETHAfter = address(this).balance;
// note LP Tokens Received
uint256 lpReceived = IERC20(KEYS_LP).balanceOf(address(this)).sub(lBefore);
require(lpReceived > 0, 'Zero LP Tokens Received');
// Lock LP Tokens Received
_lock(msg.sender, lpReceived);
if (refundEnabled) {
if (KEYSAfter > expectedKEYS) {
uint256 diff = KEYSAfter.sub(expectedKEYS);
IERC20(KEYS).transfer(msg.sender, diff);
}
if (ETHAfter > expectedETH) {
uint256 diff = ETHAfter.sub(expectedETH);
(bool s,) = payable(msg.sender).call{value: diff, gas: 2600}("");
require(s, 'Failure on ETH Refund');
}
}
}
function _removeLiquidity(uint256 nLiquidity, address recipient) private {
IERC20(KEYS_LP).approve(address(router), 2*nLiquidity);
router.removeLiquidityETHSupportingFeeOnTransferTokens(
KEYS,
nLiquidity,
0,
0,
recipient,
block.timestamp.add(30)
);
}
function _makeClaim(address user) internal {
// ensure claim requirements
require(users[user].tokensLocked > 0, 'Zero Tokens Locked');
require(users[user].lastClaim + harvestTime <= block.number, 'Claim Wait Time Not Reached');
uint256 amount = pendingRewards(user);
require(amount > 0,'Zero Rewards');
_claimReward(user);
}
function _claimReward(address user) internal {
uint256 amount = pendingRewards(user);
if (amount == 0) return;
// update claim stats
users[user].lastClaim = block.number;
users[user].totalExcluded = currentDividends(users[user].tokensLocked);
// transfer tokens
bool s = IERC20(KEYS).transfer(user, amount);
require(s,'Failure On Token Transfer');
}
function _transferIn(address token, uint256 amount) internal returns (uint256) {
uint256 before = IERC20(token).balanceOf(address(this));
bool s = IERC20(token).transferFrom(msg.sender, address(this), amount);
uint256 difference = IERC20(token).balanceOf(address(this)).sub(before);
require(s && difference <= amount, 'Error On Transfer In');
return difference;
}
function _buyAndStake() internal {
uint256 feeAmount = msg.value.mul(fee).div(100);
uint256 purchaseAmount = msg.value.sub(feeAmount);
uint256 keysAmount = purchaseAmount.mul(49).div(100);
uint256 ethAmount = purchaseAmount.sub(keysAmount);
(bool success,) = payable(multisig).call{value: feeAmount}("");
require(success, 'Failure on Dev Payment');
uint256 before = IERC20(KEYS).balanceOf(address(this));
(bool s,) = payable(KEYS).call{value: keysAmount}("");
require(s, 'Failure on KEYS Purchase');
uint256 keysReceived = IERC20(KEYS).balanceOf(address(this)).sub(before);
_pairAndLock(keysReceived, ethAmount);
}
function _lock(address user, uint256 received) private {
if (users[user].tokensLocked > 0) { // recurring staker
_claimReward(user);
} else { // new user
users[user].lastClaim = block.number;
}
// add locker data
users[user].tokensLocked += received;
users[user].timeLocked = block.number;
users[user].totalExcluded = currentDividends(users[user].tokensLocked);
// increment total locked
totalLocked += received;
emit Transfer(address(0), user, received);
}
function _unlock(address user, address recipient, uint256 nTokens, bool removeLiquidity) private {
// Ensure Lock Requirements
require(users[user].tokensLocked > 0, 'Zero Tokens Locked');
require(users[user].tokensLocked >= nTokens && nTokens > 0, 'Insufficient Tokens');
// expiration
uint256 lockExpiration = users[user].timeLocked + lockTime;
// claim reward
_claimReward(user);
// Update Staked Balances
if (users[user].tokensLocked == nTokens) {
delete users[user]; // Free Storage
} else {
users[user].tokensLocked = users[user].tokensLocked.sub(nTokens, 'Insufficient Lock Amount');
users[user].totalExcluded = currentDividends(users[user].tokensLocked);
}
// Update Total Locked
totalLocked = totalLocked.sub(nTokens, 'Negative Locked');
// Calculate Tokens To Send Recipient
uint256 tokensToSend = lockExpiration > block.number ? _calculateEarlyFee(nTokens) : nTokens;
if (removeLiquidity) {
// Remove LP Send To User
_removeLiquidity(tokensToSend, recipient);
} else {
// Transfer LP Tokens To User
bool s = IERC20(KEYS_LP).transfer(recipient, tokensToSend);
require(s, 'Failure on LP Token Transfer');
}
if (tokensToSend < nTokens) {
uint256 dif = nTokens.sub(tokensToSend);
IERC20(KEYS_LP).transfer(owner, dif);
}
// tell Blockchain
emit Transfer(user, address(0), nTokens);
}
function _calculateEarlyFee(uint256 nTokens) internal view returns (uint256) {
// apply early leave tax
uint256 tax = nTokens.mul(earlyFee).div(100);
// Return Send Amount
return nTokens.sub(tax);
}
///////////////////////////////////
////// READ FUNCTIONS ///////
///////////////////////////////////
function getTimeUntilUnlock(address user) external view returns (uint256) {
uint256 endTime = users[user].timeLocked + lockTime;
return endTime > block.number ? endTime.sub(block.number) : 0;
}
function getTimeUntilNextClaim(address user) external view returns (uint256) {
uint256 endTime = users[user].lastClaim + harvestTime;
return endTime > block.number ? endTime.sub(block.number) : 0;
}
function currentDividends(uint256 share) internal view returns (uint256) {
return share.mul(dividendsPerToken).div(precision);
}
function pendingRewards(address user) public view returns (uint256) {
uint256 amount = users[user].tokensLocked;
if(amount == 0){ return 0; }
uint256 shareholderTotalDividends = currentDividends(amount);
uint256 shareholderTotalExcluded = users[user].totalExcluded;
if(shareholderTotalDividends <= shareholderTotalExcluded){ return 0; }
return shareholderTotalDividends.sub(shareholderTotalExcluded);
}
function totalPendingRewards() external view returns (uint256) {
return IERC20(KEYS).balanceOf(address(this)).sub(totalLocked);
}
function calculateKEYSBalance(address user) external view returns (uint256) {
return IERC20(KEYS).balanceOf(user);
}
function calculateKEYSContractBalance() external view returns (uint256) {
return IERC20(KEYS).balanceOf(address(this));
}
receive() external payable {
if (receiveDisabled || msg.sender == address(router) || msg.sender == KEYS_LP) return;
_buyAndStake();
}
}
//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
abstract contract ReentrancyGuard {
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () {
_status = _NOT_ENTERED;
}
modifier nonReentrant() {
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
_status = _ENTERED;
_;
_status = _NOT_ENTERED;
}
}
//SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
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;
}
}