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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@airswap/staking/contracts/interfaces/IStaking.sol";
import "./interfaces/IPool.sol";

/**
 * @title AirSwap: Rewards Pool
 * @notice https://www.airswap.io/
 */
contract Pool is IPool, Ownable {
  using SafeERC20 for IERC20;

  bytes32 public constant DOMAIN_TYPEHASH =
    keccak256(
      abi.encodePacked(
        "EIP712Domain(",
        "string name,",
        "string version,",
        "uint256 chainId,",
        "address verifyingContract",
        ")"
      )
    );

  bytes32 public constant CLAIM_TYPEHASH =
    keccak256(
      abi.encodePacked(
        "Claim(",
        "uint256 nonce,",
        "uint256 expiry,",
        "address participant,",
        "uint256 score",
        ")"
      )
    );

  bytes32 public constant DOMAIN_NAME = keccak256("POOL");
  bytes32 public constant DOMAIN_VERSION = keccak256("1");
  uint256 public immutable DOMAIN_CHAIN_ID;
  bytes32 public immutable DOMAIN_SEPARATOR;

  uint256 internal constant MAX_PERCENTAGE = 100;
  uint256 internal constant MAX_SCALE = 77;

  // Larger the scale, lower the output for a claim
  uint256 public scale;

  // Max percentage for a claim with infinite score
  uint256 public max;

  // Mapping of address to boolean to enable admin accounts
  mapping(address => bool) public admins;

  /**
   * @notice Double mapping of signers to nonce groups to nonce states
   * @dev The nonce group is computed as nonce / 256, so each group of 256 sequential nonces uses the same key
   * @dev The nonce states are encoded as 256 bits, for each nonce in the group 0 means available and 1 means used
   */
  mapping(address => mapping(uint256 => uint256)) internal noncesClaimed;

  // Staking contract address
  address public stakingContract;

  // Staking token address
  address public stakingToken;

  /**
   * @notice Constructor
   * @param _scale uint256
   * @param _max uint256
   * @param _stakingContract address
   * @param _stakingToken address
   */
  constructor(
    uint256 _scale,
    uint256 _max,
    address _stakingContract,
    address _stakingToken
  ) {
    require(_max <= MAX_PERCENTAGE, "MAX_TOO_HIGH");
    require(_scale <= MAX_SCALE, "SCALE_TOO_HIGH");
    scale = _scale;
    max = _max;
    stakingContract = _stakingContract;
    stakingToken = _stakingToken;
    admins[msg.sender] = true;

    uint256 currentChainId = getChainId();
    DOMAIN_CHAIN_ID = currentChainId;
    DOMAIN_SEPARATOR = keccak256(
      abi.encode(
        DOMAIN_TYPEHASH,
        DOMAIN_NAME,
        DOMAIN_VERSION,
        currentChainId,
        this
      )
    );

    IERC20(stakingToken).safeApprove(stakingContract, 2**256 - 1);
  }

  /**
   * @notice Set scale
   * @dev Only owner
   * @param _scale uint256
   */
  function setScale(uint256 _scale) external override onlyOwner {
    require(_scale <= MAX_SCALE, "SCALE_TOO_HIGH");
    scale = _scale;
    emit SetScale(scale);
  }

  /**
   * @notice Set max
   * @dev Only owner
   * @param _max uint256
   */
  function setMax(uint256 _max) external override onlyOwner {
    require(_max <= MAX_PERCENTAGE, "MAX_TOO_HIGH");
    max = _max;
    emit SetMax(max);
  }

  /**
   * @notice Add admin address
   * @dev Only owner
   * @param _admin address
   */
  function addAdmin(address _admin) external override onlyOwner {
    require(_admin != address(0), "INVALID_ADDRESS");
    admins[_admin] = true;
  }

  /**
   * @notice Remove admin address
   * @dev Only owner
   * @param _admin address
   */
  function removeAdmin(address _admin) external override onlyOwner {
    require(admins[_admin] == true, "ADMIN_NOT_SET");
    admins[_admin] = false;
  }

  /**
   * @notice Set staking contract address
   * @dev Only owner
   * @param _stakingContract address
   */
  function setStakingContract(address _stakingContract)
    external
    override
    onlyOwner
  {
    require(_stakingContract != address(0), "INVALID_ADDRESS");
    // set allowance on old staking contract to zero
    IERC20(stakingToken).safeApprove(stakingContract, 0);
    stakingContract = _stakingContract;
    IERC20(stakingToken).safeApprove(stakingContract, 2**256 - 1);
  }

  /**
   * @notice Set staking token address
   * @dev Only owner
   * @param _stakingToken address
   */
  function setStakingToken(address _stakingToken) external override onlyOwner {
    require(_stakingToken != address(0), "INVALID_ADDRESS");
    // set allowance on old staking token to zero
    IERC20(stakingToken).safeApprove(stakingContract, 0);
    stakingToken = _stakingToken;
    IERC20(stakingToken).safeApprove(stakingContract, 2**256 - 1);
  }

  /**
   * @notice Admin function to migrate funds
   * @dev Only owner
   * @param tokens address[]
   * @param dest address
   */
  function drainTo(address[] calldata tokens, address dest)
    external
    override
    onlyOwner
  {
    for (uint256 i = 0; i < tokens.length; i++) {
      uint256 bal = IERC20(tokens[i]).balanceOf(address(this));
      IERC20(tokens[i]).safeTransfer(dest, bal);
    }
    emit DrainTo(tokens, dest);
  }

  /**
   * @notice Withdraw tokens from the pool using a signed claim
   * @param recipient address
   * @param minimum uint256
   * @param token address
   * @param nonce uint256
   * @param expiry uint256
   * @param score uint256
   * @param v uint8 "v" value of the ECDSA signature
   * @param r bytes32 "r" value of the ECDSA signature
   * @param s bytes32 "s" value of the ECDSA signature
   */
  function withdraw(
    address recipient,
    uint256 minimum,
    address token,
    uint256 nonce,
    uint256 expiry,
    uint256 score,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external override returns (uint256) {
    _checkValidClaim(nonce, expiry, score, v, r, s);
    uint256 amount = _withdrawCheck(score, token, minimum);
    IERC20(token).safeTransfer(recipient, amount);
    emit Withdraw(nonce, expiry, msg.sender, token, amount, score);
    return amount;
  }

  /**
   * @notice Withdraw tokens from the pool using signature and stake for a recipient
   * @param recipient address
   * @param minimum uint256
   * @param token address
   * @param nonce uint256
   * @param expiry uint256
   * @param score uint256
   * @param v uint8 "v" value of the ECDSA signature
   * @param r bytes32 "r" value of the ECDSA signature
   * @param s bytes32 "s" value of the ECDSA signature
   */
  function withdrawAndStake(
    address recipient,
    uint256 minimum,
    address token,
    uint256 nonce,
    uint256 expiry,
    uint256 score,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external override returns (uint256) {
    require(token == address(stakingToken), "INVALID_TOKEN");
    _checkValidClaim(nonce, expiry, score, v, r, s);
    uint256 amount = _withdrawCheck(score, token, minimum);
    IStaking(stakingContract).stakeFor(recipient, amount);
    emit Withdraw(nonce, expiry, msg.sender, token, amount, score);
    return amount;
  }

  /**
   * @notice Calculate output amount for an input score
   * @param score uint256
   * @param token address
   * @return amount uint256 amount to claim based on balance, scale, and max
   */
  function calculate(uint256 score, address token)
    public
    view
    override
    returns (uint256 amount)
  {
    uint256 balance = IERC20(token).balanceOf(address(this));
    uint256 divisor = (uint256(10)**scale) + score;
    return (max * score * balance) / divisor / 100;
  }

  /**
   * @notice Verify a signature
   * @param nonce uint256
   * @param expiry uint256
   * @param participant address
   * @param score uint256
   * @param v uint8 "v" value of the ECDSA signature
   * @param r bytes32 "r" value of the ECDSA signature
   * @param s bytes32 "s" value of the ECDSA signature
   */
  function verify(
    uint256 nonce,
    uint256 expiry,
    address participant,
    uint256 score,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) public view override returns (bool valid) {
    require(DOMAIN_CHAIN_ID == getChainId(), "CHAIN_ID_CHANGED");
    require(expiry > block.timestamp, "EXPIRY_PASSED");
    bytes32 claimHash = keccak256(
      abi.encode(CLAIM_TYPEHASH, nonce, expiry, participant, score)
    );
    address signatory = ecrecover(
      keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, claimHash)),
      v,
      r,
      s
    );
    admins[signatory] && !nonceUsed(participant, nonce)
      ? valid = true
      : valid = false;
  }

  /**
   * @notice Returns true if the nonce has been used
   * @param participant address
   * @param nonce uint256
   */
  function nonceUsed(address participant, uint256 nonce)
    public
    view
    override
    returns (bool)
  {
    uint256 groupKey = nonce / 256;
    uint256 indexInGroup = nonce % 256;
    return (noncesClaimed[participant][groupKey] >> indexInGroup) & 1 == 1;
  }

  /**
   * @notice Returns the current chainId using the chainid opcode
   * @return id uint256 The chain id
   */
  function getChainId() public view returns (uint256 id) {
    // no-inline-assembly
    assembly {
      id := chainid()
    }
  }

  /**
   * @notice Checks Claim Nonce, Expiry, Participant, Score, Signature
   * @param nonce uint256
   * @param expiry uint256
   * @param score uint256
   * @param v uint8 "v" value of the ECDSA signature
   * @param r bytes32 "r" value of the ECDSA signature
   * @param s bytes32 "s" value of the ECDSA signature
   */
  function _checkValidClaim(
    uint256 nonce,
    uint256 expiry,
    uint256 score,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) internal {
    require(DOMAIN_CHAIN_ID == getChainId(), "CHAIN_ID_CHANGED");
    require(expiry > block.timestamp, "EXPIRY_PASSED");
    bytes32 claimHash = keccak256(
      abi.encode(CLAIM_TYPEHASH, nonce, expiry, msg.sender, score)
    );
    address signatory = ecrecover(
      keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, claimHash)),
      v,
      r,
      s
    );
    require(admins[signatory], "UNAUTHORIZED");
    require(_markNonceAsUsed(msg.sender, nonce), "NONCE_ALREADY_USED");
  }

  /**
   * @notice Marks a nonce as used for the given participant
   * @param participant address
   * @param nonce uint256
   * @return bool True if nonce was not marked as used already
   */
  function _markNonceAsUsed(address participant, uint256 nonce)
    internal
    returns (bool)
  {
    uint256 groupKey = nonce / 256;
    uint256 indexInGroup = nonce % 256;
    uint256 group = noncesClaimed[participant][groupKey];

    // If it is already used, return false
    if ((group >> indexInGroup) & 1 == 1) {
      return false;
    }

    noncesClaimed[participant][groupKey] = group | (uint256(1) << indexInGroup);

    return true;
  }

  /**
   * @notice Withdraw tokens from the pool using a score
   * @param score uint256
   * @param token address
   * @param minimumAmount uint256
   */
  function _withdrawCheck(
    uint256 score,
    address token,
    uint256 minimumAmount
  ) internal view returns (uint256) {
    require(score > 0, "SCORE_MUST_BE_PROVIDED");
    uint256 amount = calculate(score, token);
    require(amount >= minimumAmount, "INSUFFICIENT_AMOUNT");
    return amount;
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^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
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.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));
        }
    }

    /**
     * @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

pragma solidity ^0.8.0;

interface IStaking {
  struct Stake {
    uint256 duration;
    uint256 balance;
    uint256 timestamp;
  }

  // ERC-20 Transfer event
  event Transfer(address indexed from, address indexed to, uint256 tokens);

  // Schedule timelock event
  event ScheduleDurationChange(uint256 indexed unlockTimestamp);

  // Cancel timelock event
  event CancelDurationChange();

  // Complete timelock event
  event CompleteDurationChange(uint256 indexed newDuration);

  // Propose Delegate event
  event ProposeDelegate(address indexed delegate, address indexed account);

  // Set Delegate event
  event SetDelegate(address indexed delegate, address indexed account);

  /**
   * @notice Stake tokens
   * @param amount uint256
   */
  function stake(uint256 amount) external;

  /**
   * @notice Unstake tokens
   * @param amount uint256
   */
  function unstake(uint256 amount) external;

  /**
   * @notice Receive stakes for an account
   * @param account address
   */
  function getStakes(address account)
    external
    view
    returns (Stake memory accountStake);

  /**
   * @notice Total balance of all accounts (ERC-20)
   */
  function totalSupply() external view returns (uint256);

  /**
   * @notice Balance of an account (ERC-20)
   */
  function balanceOf(address account) external view returns (uint256);

  /**
   * @notice Decimals of underlying token (ERC-20)
   */
  function decimals() external view returns (uint8);

  /**
   * @notice Stake tokens for an account
   * @param account address
   * @param amount uint256
   */
  function stakeFor(address account, uint256 amount) external;

  /**
   * @notice Available amount for an account
   * @param account uint256
   */
  function available(address account) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IPool {
  event Withdraw(
    uint256 indexed nonce,
    uint256 indexed expiry,
    address indexed account,
    address token,
    uint256 amount,
    uint256 score
  );
  event SetScale(uint256 scale);
  event SetMax(uint256 max);
  event DrainTo(address[] tokens, address dest);

  function setScale(uint256 _scale) external;

  function setMax(uint256 _max) external;

  function addAdmin(address _admin) external;

  function removeAdmin(address _admin) external;

  function setStakingContract(address _stakingContract) external;

  function setStakingToken(address _stakingToken) external;

  function drainTo(address[] calldata tokens, address dest) external;

  function withdraw(
    address recipient,
    uint256 minimum,
    address token,
    uint256 nonce,
    uint256 expiry,
    uint256 score,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external returns (uint256);

  function withdrawAndStake(
    address recipient,
    uint256 minimum,
    address token,
    uint256 nonce,
    uint256 expiry,
    uint256 score,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external returns (uint256);

  function calculate(uint256 score, address token)
    external
    view
    returns (uint256 amount);

  function verify(
    uint256 nonce,
    uint256 expiry,
    address participant,
    uint256 score,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external view returns (bool valid);

  function nonceUsed(address participant, uint256 nonce)
    external
    view
    returns (bool);
}

// 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 v4.4.1 (utils/Address.sol)

pragma solidity ^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;
        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");

        (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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"uint256","name":"_scale","type":"uint256"},{"internalType":"uint256","name":"_max","type":"uint256"},{"internalType":"address","name":"_stakingContract","type":"address"},{"internalType":"address","name":"_stakingToken","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address[]","name":"tokens","type":"address[]"},{"indexed":false,"internalType":"address","name":"dest","type":"address"}],"name":"DrainTo","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":"uint256","name":"max","type":"uint256"}],"name":"SetMax","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"scale","type":"uint256"}],"name":"SetScale","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"nonce","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"expiry","type":"uint256"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"score","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"CLAIM_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DOMAIN_CHAIN_ID","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DOMAIN_NAME","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DOMAIN_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DOMAIN_VERSION","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_admin","type":"address"}],"name":"addAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"admins","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"score","type":"uint256"},{"internalType":"address","name":"token","type":"address"}],"name":"calculate","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"tokens","type":"address[]"},{"internalType":"address","name":"dest","type":"address"}],"name":"drainTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getChainId","outputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"max","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"participant","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"}],"name":"nonceUsed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_admin","type":"address"}],"name":"removeAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"scale","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_max","type":"uint256"}],"name":"setMax","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_scale","type":"uint256"}],"name":"setScale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_stakingContract","type":"address"}],"name":"setStakingContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_stakingToken","type":"address"}],"name":"setStakingToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakingContract","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stakingToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"address","name":"participant","type":"address"},{"internalType":"uint256","name":"score","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"verify","outputs":[{"internalType":"bool","name":"valid","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"minimum","type":"uint256"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint256","name":"score","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"minimum","type":"uint256"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint256","name":"score","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"withdrawAndStake","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000640000000000000000000000006d88b09805b90dad911e5c5a512eedd984d6860b00000000000000000000000027054b13b1b798b345b591a4d22e6562d47ea75a

-----Decoded View---------------
Arg [0] : _scale (uint256): 10
Arg [1] : _max (uint256): 100
Arg [2] : _stakingContract (address): 0x6d88B09805b90dad911E5C5A512eEDd984D6860B
Arg [3] : _stakingToken (address): 0x27054b13b1B798B345b591a4d22e6562d47eA75a

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000064
Arg [2] : 0000000000000000000000006d88b09805b90dad911e5c5a512eedd984d6860b
Arg [3] : 00000000000000000000000027054b13b1b798b345b591a4d22e6562d47ea75a