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//SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/IElleriumTokenERC20.sol";

/// Insufficient value. 
/// Minimum `minimum` but only `attempt` provided.
/// @param attempt value provided.
/// @param minimum minimum value.
error InsufficientValue(uint256 attempt, uint256 minimum);

/// Value too large. Maximum `maximum` but `attempt` provided.
/// @param attempt balance available.
/// @param maximum maximum value.
error ValueOverflow(uint256 attempt, uint256 maximum); 

/// @title Allows stakingToken to be staked and unstaked, accruing rewardsToken.
/// @author Wayne (Ellerian Prince)
/// @notice Allows $MLP ($ELM-$MAGIC LP Tokens) to be staked to accumulate $ELM rewards.
/// @dev Stakers receive % proportionate to their staked tokens in the pool.
contract ElleriumLPStakingPool is Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20;

    /// @notice Total LP tokens staked in WEI.
    uint256 public totalStaked;

    /// @notice Address of the ERC20 reward token.
    IElleriumTokenERC20 public rewardsToken;

    /// @notice Address of the ERC20 staked token.
    IERC20 public stakingToken;

    /// @notice Address holding staking fees.
    address public stakingLPFeesAddress = 0x69832Af74774baE99D999e7F74FE3F7d5833bF84;

    /// @notice Minimum amount to be a valid stake (1 Ether).
    uint256 public minimumStakeAmount = 1 * 1e18;

    /// @notice Reward rate for emissions in WEI. (default 500 ELM per day).
    uint256 public rewardRate = 5787036000000000;

    /// @dev Last rewardPerToken() update time.
    uint256 private lastUpdateTime;

    /// @dev Last rewardPerToken() update time.
    uint256 private rewardPerTokenStored;

    /// @dev Mapping from user address to their last updated individual rewardPerToken.
    mapping(address => uint256) private userRewardPerTokenPaid;

    /// @dev Mapping from user address to their total $ELM rewards.
    mapping(address => uint256) private totalRewards;

    /// @dev Mapping from user address to their $MLP balances.
    mapping(address => uint256) private balances;

    /// @dev Mapping from user address to their latest deposit time.
    mapping(address => uint256) private latestDepositTime;

    /// @dev Are fees in effect?
    bool public applyFees = true;

    /// @dev Fee timing intervals. Each index represents the interval in seconds.
    uint256[] public feesInterval = [60, 3600, 86400, 259200, 604800, 2592000];

    /// @dev Initializes dependencies.
    /// @param _stakingToken ERC20 token to be staked.
    /// @param _rewardsToken ERC20 token to be rewarded.
    constructor(address _stakingToken, address _rewardsToken) {
        stakingToken = IERC20(_stakingToken);
        rewardsToken = IElleriumTokenERC20(_rewardsToken);
    }

    /// @notice Exposes withdrawal fees based on sender's last deposit timing.
    /// @dev Results need to be / 100 to give its % representation.
    /// @return Withdrawal fees.
    function getWithdrawalFees() public view returns (uint256) {
        uint256 timeDifference = block.timestamp - latestDepositTime[msg.sender];
        if (applyFees) {
            if (timeDifference <= feesInterval[0]) { // 50% slashing fee
                return 5000;
            } else if (timeDifference <= feesInterval[1]) { // 20% if before 1st hour.
                return 2000;
            } else if (timeDifference <= feesInterval[2]) { // 10% if before 1st day.
                return 1000;
            } else if (timeDifference <= feesInterval[3]) { // 5% if before 3 days.
                return 500;
            } else if (timeDifference <= feesInterval[4]) { // 3% if before 1 week.
                return 300;
            } else if (timeDifference <= feesInterval[5]) { // 1% if before 1 month.
                return 100;
            }
            return 50;
        }
        return 0;        
    }

    /// @notice (Owner Only) Sets the rewardsToken accumulation rate.
    /// @dev Changing this does not affect accrued rewards.
    /// @param _emissionRateInWEI New emission rate, in WEI.
    /// @param _isFeesApply Should fees be taken?
    function setRewardRate(uint256 _emissionRateInWEI, bool _isFeesApply) external onlyOwner {
        rewardRate = _emissionRateInWEI;
        applyFees = _isFeesApply;
    }

    /// @notice Exposes sender's last deposit timing.
    /// @return Timestamp of last deposit.
    function getLastDepositTime() external view returns (uint256) {
         return latestDepositTime[msg.sender];
    }

    /// @notice Exposes stakingToken balance of an address.
    /// @return stakingToken balance of the address in WEI.
    function balanceOf(address _account) external view returns (uint256) {
        return balances[_account];
    }

    /// @notice Exposes sender's claimable rewardToken balance.
    /// @return Sender's Claimable rewardToken balance in WEI.
    function checkTotalRewards() external view returns (uint256) {
        return totalRewards[msg.sender];
    }

    /// @notice Exposes value to be accrued by a single token unit since last update.
    /// @return Value to be accrued by a single token unit.
    /// @dev Called in updateReward modifier.
    function rewardPerToken() public view returns (uint256) {
        if (totalStaked == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored + (block.timestamp - lastUpdateTime) * rewardRate * 1e18 / totalStaked;
    }

    /// @notice Exposes rewards accrued by a specified address.
    /// @return Rewards accrued by the specified address.
    /// @dev Called in updateReward modifier.
    function earned(address account) public view returns (uint256) {
        return 
        balances[account] * (rewardPerToken() - userRewardPerTokenPaid[account]) / 1e18 + totalRewards[account];
    }

    /// @notice Sends stakedTokens into the contract to start accruing rewardTokens.
    /// @dev Tokens are held in the contract until unstaked. 
    ///      This changes the value of a single token unit, updateReward modifier is called.
    function stake(uint256 _amount) external nonReentrant updateReward(msg.sender) {
        // Must deposit minimum 1 Ether.
        if (_amount < minimumStakeAmount) {
            revert InsufficientValue(_amount, minimumStakeAmount);
        }
        
        // Transfer tokens into this contract.
        stakingToken.safeTransferFrom(msg.sender, address(this), _amount);

        // Update sender and pool's balances, deposit timing.
        totalStaked += _amount;
        balances[msg.sender] += _amount;
        latestDepositTime[msg.sender] = block.timestamp;

        // Emit Staked event for indexing.
        emit Staked(msg.sender, _amount);
    }

    /// @notice Retrieve deposited stakedTokens without claiming rewards.
    /// @dev This changes the value of a single token unit, updateReward modifier is called.
    function unstake(uint256 _amount) public nonReentrant updateReward(msg.sender) {
        // Can only withdraw within balances.
        if (_amount > balances[msg.sender]) {
            revert ValueOverflow(_amount, balances[msg.sender]);
        }

        // Update sender and pool's balances.
        totalStaked -= _amount;
        balances[msg.sender] -= _amount;        

        // Calculate tax if necessary.
        if (applyFees) {
            // Divide by 100 to calculate in %, then by another 100 to get the actual %
            uint256 taxFee = _amount * getWithdrawalFees() / 10000;

            // Transfer tokens from this contract back to the sender, taking a fee if enabled.
            stakingToken.safeTransfer(stakingLPFeesAddress, taxFee);
            stakingToken.safeTransfer(msg.sender, _amount - taxFee);
        } else {
            // Send full amount back to sender.
            stakingToken.safeTransfer(msg.sender, _amount);
        }

        // Emit Unstaked event for indexing.
        emit Unstaked(msg.sender, _amount);
    }

    /// @notice Claims accrued rewards.
    /// @dev Rewards are minted from rewardToken. This contract needs to have perms to mint.
    function getReward() public nonReentrant updateReward(msg.sender) {
        uint256 reward = totalRewards[msg.sender];
        if (reward > 0) {
            totalRewards[msg.sender] = 0;

            rewardsToken.mint(msg.sender, reward);
            emit ClaimedReward(msg.sender, reward);
        }
    }

    /// @notice Allows a user to retrieve all his stakedTokens and claim accrued rewards together.
    function unstakeAll() external {
        uint256 balance = balances[msg.sender];
        unstake(balance);
        getReward();
    }

    /// @dev Updates rewardPerToken globally using the totalBalance and the earned rewards for an account.
    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = block.timestamp;

        totalRewards[account] = earned(account);
        userRewardPerTokenPaid[account] = rewardPerTokenStored;
        _;
    }

    /// @notice Event emitted when $ELM rewards are claimed.
    /// @param from The address of the caller.
    /// @param value The value of the claimed reward in WEI.
    event ClaimedReward(address indexed from, uint256 value);

    /// @notice Event emitted when $MLP balance increases.
    /// @param from The address of the caller.
    /// @param value The value of the stake in WEI.
    event Staked(address indexed from, uint256 value);

    /// @notice Event emitted when $MLP balance decreases.
    /// @param from The address of the caller.
    /// @param value The value of the unstake in WEI.
    event Unstaked(address indexed from, uint256 value);
}

pragma solidity ^0.8.0;
//SPDX-License-Identifier: MIT

// Interface for $ELLERIUM.
contract IElleriumTokenERC20 {
    function mint(address _recipient, uint256 _amount) public {}
    function SetBlacklistedAddress(address[] memory _addresses, bool _blacklisted) public {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 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 SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^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() {
        _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 making 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

{
  "remappings": [],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000003e8fb78ec6fb60575967bb07ac64e5fa9f498a4a000000000000000000000000eeac5e75216571773c0064b3b591a86253791db6

-----Decoded View---------------
Arg [0] : _stakingToken (address): 0x3e8FB78Ec6Fb60575967bB07AC64e5FA9F498a4a
Arg [1] : _rewardsToken (address): 0xEEac5E75216571773C0064b3B591A86253791DB6

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000003e8fb78ec6fb60575967bb07ac64e5fa9f498a4a
Arg [1] : 000000000000000000000000eeac5e75216571773c0064b3b591a86253791db6