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// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

import "./openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol";
import "./openzeppelin-solidity/contracts/token/ERC20/IERC20.sol";
import "./openzeppelin-solidity/contracts/access/Ownable.sol";

contract RewardProgram is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    bytes32 public merkleRoot;
    bool public cancelable;
    IERC20 public tokenContract;
    uint256 public fullRewardTimeoutPeriod = 180 days;
    uint256 public shortRewardTimeoutPeriod = 30 days;
    uint256 public shortRewardPercentage = 2;
    uint256 public merkleRootLastUpdateTime;
    uint256 public merkleRootLastUpdateBlock;

    struct User {
        string sidechainAddress;
        bytes signature;
        string message;
    }

    struct AmountWithTime {
        uint amount;
        uint timestamp;
        bool isWithdrowedByNominator;
        bool isFullWithdrawal;
    }

    mapping(address => uint256) public lastRewardRequestTime;

    mapping(address => AmountWithTime[]) public requestedRewards;

    mapping(address => AmountWithTime[]) public receivedRewards;

    modifier isCancelable() {
        require(!cancelable, "forbidden action");
        _;
    }

    event AddLink (address indexed ethereumAddress, string target, bytes signature, string message);
    event RequestReward (address target, uint amount, bool isFullWithdrawal);
    event ReceiveReward (address target, uint amount, bool indexed isWithdrowedByNominator);
    event UpdateMerkleRoot (bytes32 merkleRoot);

    function contractTokenBalance() public view returns(uint) {
		return tokenContract.balanceOf(address(this));
	}

    function getRequestedRewardArray(address target) public view returns(AmountWithTime[] memory) {
        return requestedRewards[target];
    }

    function getReceivedRewardArray(address target) public view returns(AmountWithTime[] memory) {
        return receivedRewards[target];
    }

    constructor(address _tokenContract, bool _cancelable) public  {
        tokenContract = IERC20(_tokenContract);
        cancelable = _cancelable;
    }

    function setCancelable(bool _cancelable) public onlyOwner {
        cancelable = _cancelable;
    }

    function setFullRewardTimeoutPeriod(uint256 period) public onlyOwner {
	    fullRewardTimeoutPeriod = period;
	}

	function setShortRewardTimeoutPeriod(uint256 period) public onlyOwner {
	    shortRewardTimeoutPeriod = period;
	}

	function setShortRewardPercentage(uint256 percentage) public onlyOwner {
	    shortRewardPercentage = percentage;
	}

    function linkAddresses(string memory target, bytes memory signature, string memory message) public {
        emit AddLink(msg.sender, target, signature, message);
    }

    function setRoot(bytes32 _merkleRoot, uint256 amount) public onlyOwner {
        address ownContractAddress = address(this);
        if (amount > 0) {
            require(tokenContract.allowance(owner(), ownContractAddress) >= amount, "approved balance not enough");
            tokenContract.transferFrom(owner(), ownContractAddress, amount);
        }
        merkleRoot = _merkleRoot;
        merkleRootLastUpdateTime = block.timestamp;
        merkleRootLastUpdateBlock = block.number;
        cancelable = false;
        emit UpdateMerkleRoot(_merkleRoot);
    }

    function requestReward(uint256 amount, bool isFullWithdrawal) internal returns (bool) {
        uint timestamp = block.timestamp;
        lastRewardRequestTime[msg.sender] = timestamp;
        requestedRewards[msg.sender].push(AmountWithTime(amount, timestamp, false, isFullWithdrawal));
        emit RequestReward(msg.sender, amount, isFullWithdrawal);
        return true;
    }

    function calculateShortAmount(uint amount) internal view returns(uint) {
        return amount.mul(shortRewardPercentage).div(10);
    }

    function getRequestAmountWithError(address target, uint item) internal view returns(uint amount, uint timestamp, bool isWithdrowedByNominator, bool isFullWithdrawal) {
        require(item < requestedRewards[target].length, "item is not exist");

        AmountWithTime storage request = requestedRewards[target][item];
        uint256 fullAmount = request.amount;
        uint256 fullTimestamp = request.timestamp;
        bool fullWithdrawal = request.isFullWithdrawal;
        uint256 timePeriod = fullWithdrawal ? fullRewardTimeoutPeriod : shortRewardTimeoutPeriod;
        require(fullAmount > 0, "item is empty");
        require(block.timestamp >= fullTimestamp + timePeriod, "expiration period is not over");
        amount = fullAmount;
        timestamp = request.timestamp;
        isWithdrowedByNominator = request.isWithdrowedByNominator;
        isFullWithdrawal = fullWithdrawal;
    }

    function transferOrApproveRewardToAddress(address target, uint amount, bool isWithdrowedByNominator, bool isApprove, bool isFullWithdrawal) internal {
        receivedRewards[target].push(AmountWithTime(amount, block.timestamp, isWithdrowedByNominator, isFullWithdrawal));
        if (isApprove) {
            tokenContract.approve(target, amount);
        } else {
            tokenContract.transfer(target, amount);
        }
        emit ReceiveReward(target, amount, isWithdrowedByNominator);
    }

    function receiveResidue(address target, uint item, address receiver) public onlyOwner {
        (uint amount, uint timestamp, bool isWithdrowedByNominator, bool isFullWithdrawal) = getRequestAmountWithError(target, item);
        require(isWithdrowedByNominator, "reward is not received by user");
        require(contractTokenBalance() >= amount, "not enough balance");
        delete requestedRewards[target][item];
        bool isApprove = true;
        transferOrApproveRewardToAddress(receiver, amount, false, isApprove, isFullWithdrawal);
    }

    function receiveReward(uint item) public {
        address target = msg.sender;
        (uint fullAmount, uint timestamp, bool isWithdrowedByNominator, bool isFullWithdrawal) = getRequestAmountWithError(target, item);

        require(!isWithdrowedByNominator, "reward already received");

        uint amount = fullAmount;
        uint residue = 0;
        if (!isFullWithdrawal) {
            amount = calculateShortAmount(fullAmount);
            residue = fullAmount.sub(amount);
        }
        require(contractTokenBalance() >= amount, "not enough balance");

        AmountWithTime storage request = requestedRewards[target][item];

        if (!isFullWithdrawal) {
            request.isWithdrowedByNominator = true;
            request.amount = residue;
            request.isFullWithdrawal = true;
            request.timestamp = block.timestamp;
        } else {
            delete requestedRewards[target][item];
        }
        bool isApprove = false;
        transferOrApproveRewardToAddress(target, amount, true, isApprove, isFullWithdrawal);
    }

    function transferAllTokensToOwner() public onlyOwner returns(bool) {
        tokenContract.transfer(owner(), contractTokenBalance());
        return true;
    }

    function leafFromAddressAndAmount(address _a, uint256 _n) internal pure returns(bytes32) {
        return keccak256(abi.encodePacked(_a, _n));
    }

    function checkProof(bytes32[] memory proof, bytes32 hash) internal view returns (bool) {
        bytes32 el;
        bytes32 h = hash;

        for (uint i = 0; i <= proof.length - 1; i += 1) {
            el = proof[i];

            if (h <= el) {
                h = keccak256(abi.encodePacked(h, el));
            } else {
                h = keccak256(abi.encodePacked(el, h));
            }
        }

        return h == merkleRoot;
    }

    function requestTokensByMerkleProof(bytes32[] memory _proof, uint256 _amount, bool _isFullWithdrawal) public isCancelable returns(bool) {
        require(lastRewardRequestTime[msg.sender] < merkleRootLastUpdateTime, "already withdrawn in this period");
        require(_amount > 0, "amount should be not zero");
        if (!_isFullWithdrawal) {
            require(calculateShortAmount(_amount) > 0, "amount too low"); 
        }
        require(checkProof(_proof, leafFromAddressAndAmount(msg.sender, _amount)), "proof is not correct");
        return requestReward(_amount, _isFullWithdrawal);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../GSN/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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public 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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.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 SafeMath for uint256;
    using Address for address;

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

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);
    }

    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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

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, 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;
    }
}

// SPDX-License-Identifier: MIT

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;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_tokenContract","type":"address"},{"internalType":"bool","name":"_cancelable","type":"bool"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"ethereumAddress","type":"address"},{"indexed":false,"internalType":"string","name":"target","type":"string"},{"indexed":false,"internalType":"bytes","name":"signature","type":"bytes"},{"indexed":false,"internalType":"string","name":"message","type":"string"}],"name":"AddLink","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"target","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":true,"internalType":"bool","name":"isWithdrowedByNominator","type":"bool"}],"name":"ReceiveReward","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"target","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"bool","name":"isFullWithdrawal","type":"bool"}],"name":"RequestReward","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"merkleRoot","type":"bytes32"}],"name":"UpdateMerkleRoot","type":"event"},{"inputs":[],"name":"cancelable","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"contractTokenBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fullRewardTimeoutPeriod","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"}],"name":"getReceivedRewardArray","outputs":[{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"bool","name":"isWithdrowedByNominator","type":"bool"},{"internalType":"bool","name":"isFullWithdrawal","type":"bool"}],"internalType":"struct RewardProgram.AmountWithTime[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"}],"name":"getRequestedRewardArray","outputs":[{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"bool","name":"isWithdrowedByNominator","type":"bool"},{"internalType":"bool","name":"isFullWithdrawal","type":"bool"}],"internalType":"struct RewardProgram.AmountWithTime[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastRewardRequestTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"target","type":"string"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"string","name":"message","type":"string"}],"name":"linkAddresses","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"merkleRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"merkleRootLastUpdateBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"merkleRootLastUpdateTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"},{"internalType":"uint256","name":"item","type":"uint256"},{"internalType":"address","name":"receiver","type":"address"}],"name":"receiveResidue","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"item","type":"uint256"}],"name":"receiveReward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"receivedRewards","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"bool","name":"isWithdrowedByNominator","type":"bool"},{"internalType":"bool","name":"isFullWithdrawal","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"_proof","type":"bytes32[]"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bool","name":"_isFullWithdrawal","type":"bool"}],"name":"requestTokensByMerkleProof","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"requestedRewards","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"bool","name":"isWithdrowedByNominator","type":"bool"},{"internalType":"bool","name":"isFullWithdrawal","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bool","name":"_cancelable","type":"bool"}],"name":"setCancelable","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"period","type":"uint256"}],"name":"setFullRewardTimeoutPeriod","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_merkleRoot","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"setRoot","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"percentage","type":"uint256"}],"name":"setShortRewardPercentage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"period","type":"uint256"}],"name":"setShortRewardTimeoutPeriod","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"shortRewardPercentage","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"shortRewardTimeoutPeriod","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenContract","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"transferAllTokensToOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000003593d125a4f7849a1b059e64f4517a86dd60c95d0000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _tokenContract (address): 0x3593D125a4f7849a1B059E64F4517A86Dd60c95d
Arg [1] : _cancelable (bool): False

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000003593d125a4f7849a1b059e64f4517a86dd60c95d
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000