Contract Source Code (Solidity)

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Outline

• library SafeMath
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b, st ...
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b, st ...
•    - function mod(uint256 a, uint256 b)
•    - function mod(uint256 a, uint256 b, st ...
• library Address
•    - function isContract(address account)
•    - function toPayable(address account)
•    - function sendValue(address payable re ...
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
• library SafeERC20
•    - function safeTransfer(IERC20 token, a ...
•    - function safeTransferFrom(IERC20 toke ...
•    - function safeApprove(IERC20 token, ad ...
•    - function safeIncreaseAllowance(IERC20 ...
•    - function safeDecreaseAllowance(IERC20 ...
•    - function callOptionalReturn(IERC20 to ...
•  contract Context
•    - function _msgSender()
•    - function _msgData()
•  contract Ownable is Context
•    - function owner()
•    - function isOwner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
• interface IERC1820Registry
•    - function setManager(address account, ...
•    - function getManager(address account)
•    - function setInterfaceImplementer(addr ...
•    - function getInterfaceImplementer(addr ...
•    - function interfaceHash(string calldat ...
•    - function updateERC165Cache(address ac ...
•    - function implementsERC165Interface(ad ...
•    - function implementsERC165InterfaceNoC ...
• interface IERC777Recipient
•    - function tokensReceived(
• interface IUniswapV2Pair
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address owner)
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transfer(address to, uint va ...
•    - function transferFrom(address from, a ...
•    - function DOMAIN_SEPARATOR()
•    - function PERMIT_TYPEHASH()
•    - function nonces(address owner)
•    - function permit(address owner, addres ...
•    - function MINIMUM_LIQUIDITY()
•    - function factory()
•    - function token0()
•    - function token1()
•    - function getReserves()
•    - function price0CumulativeLast()
•    - function price1CumulativeLast()
•    - function kLast()
•    - function mint(address to)
•    - function burn(address to)
•    - function swap(uint amount0Out, uint a ...
•    - function skim(address to)
•    - function sync()
•    - function initialize(address, address)
• library UniswapV2Library
•    - function getAmountOut(
•    - function calculateSlippageAmountWithF ...
•    - function calculateRate(uint256 _amoun ...
• library Math
•    - function max(uint256 a, uint256 b)
•    - function min(uint256 a, uint256 b)
•    - function average(uint256 a, uint256 b ...
•  contract IRewardDistributionRecipi ...
•    - function notifyRewardAmount(uint256 r ...
•    - function setRewardDistribution(addres ...
•  contract LPTokenWrapper
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function stakeFor(address _user, uint ...
•    - function stake(uint256 _amount)
•    - function approve(address _user, uint2 ...
•    - function withdraw(uint256 _amount)
•    - function withdrawFrom(address _user, ...
•    - function allowance(address _owner, ad ...
•    - function _stake(address _user, uint25 ...
•    - function _withdraw(address _owner, ui ...
•    - function _approve(
•  contract ModifiedUnipool is LPToke ...
•    - function notifyRewardAmount(uint256 r ...
•    - function exit()
•    - function lastTimeRewardApplicable()
•    - function rewardPerToken()
•    - function earned(address account)
•    - function stake(uint256 amount)
•    - function stakeFor(address _user, uint ...
•    - function withdraw(uint256 amount)
•    - function withdrawFrom(address _user, ...
•    - function getReward()
•    - function getReward(address _user)
•    - function _getReward(address _user)
•  contract RewardedWbtcPbtcUniV2Pair ... *
•    - function setAllowedSlippage(uint256 _ ...
•    - function setAllowedRate(uint256 _allo ...
•    - function tokensReceived(
•    - function unstake()
•    - function _stakeFor(address _user, uin ...

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/**
 *Submitted for verification at Etherscan.io on 2020-09-25
*/

pragma solidity ^0.5.0;


/**
 * @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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing 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.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-call-value
        (bool success, ) = recipient.call.value(amount)("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
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);
}

/**
 * @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 ERC20;` 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));
    }

    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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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");
        }
    }
}

/*
 * @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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

/**
 * @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.
 *
 * 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.
 */
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 {
        _owner = _msgSender();
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @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(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _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 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 onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * @dev Interface of the global ERC1820 Registry, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1820[EIP]. Accounts may register
 * implementers for interfaces in this registry, as well as query support.
 *
 * Implementers may be shared by multiple accounts, and can also implement more
 * than a single interface for each account. Contracts can implement interfaces
 * for themselves, but externally-owned accounts (EOA) must delegate this to a
 * contract.
 *
 * {IERC165} interfaces can also be queried via the registry.
 *
 * For an in-depth explanation and source code analysis, see the EIP text.
 */
interface IERC1820Registry {
    /**
     * @dev Sets `newManager` as the manager for `account`. A manager of an
     * account is able to set interface implementers for it.
     *
     * By default, each account is its own manager. Passing a value of `0x0` in
     * `newManager` will reset the manager to this initial state.
     *
     * Emits a {ManagerChanged} event.
     *
     * Requirements:
     *
     * - the caller must be the current manager for `account`.
     */
    function setManager(address account, address newManager) external;

    /**
     * @dev Returns the manager for `account`.
     *
     * See {setManager}.
     */
    function getManager(address account) external view returns (address);

    /**
     * @dev Sets the `implementer` contract as `account`'s implementer for
     * `interfaceHash`.
     *
     * `account` being the zero address is an alias for the caller's address.
     * The zero address can also be used in `implementer` to remove an old one.
     *
     * See {interfaceHash} to learn how these are created.
     *
     * Emits an {InterfaceImplementerSet} event.
     *
     * Requirements:
     *
     * - the caller must be the current manager for `account`.
     * - `interfaceHash` must not be an {IERC165} interface id (i.e. it must not
     * end in 28 zeroes).
     * - `implementer` must implement {IERC1820Implementer} and return true when
     * queried for support, unless `implementer` is the caller. See
     * {IERC1820Implementer-canImplementInterfaceForAddress}.
     */
    function setInterfaceImplementer(address account, bytes32 interfaceHash, address implementer) external;

    /**
     * @dev Returns the implementer of `interfaceHash` for `account`. If no such
     * implementer is registered, returns the zero address.
     *
     * If `interfaceHash` is an {IERC165} interface id (i.e. it ends with 28
     * zeroes), `account` will be queried for support of it.
     *
     * `account` being the zero address is an alias for the caller's address.
     */
    function getInterfaceImplementer(address account, bytes32 interfaceHash) external view returns (address);

    /**
     * @dev Returns the interface hash for an `interfaceName`, as defined in the
     * corresponding
     * https://eips.ethereum.org/EIPS/eip-1820#interface-name[section of the EIP].
     */
    function interfaceHash(string calldata interfaceName) external pure returns (bytes32);

    /**
     *  @notice Updates the cache with whether the contract implements an ERC165 interface or not.
     *  @param account Address of the contract for which to update the cache.
     *  @param interfaceId ERC165 interface for which to update the cache.
     */
    function updateERC165Cache(address account, bytes4 interfaceId) external;

    /**
     *  @notice Checks whether a contract implements an ERC165 interface or not.
     *  If the result is not cached a direct lookup on the contract address is performed.
     *  If the result is not cached or the cached value is out-of-date, the cache MUST be updated manually by calling
     *  {updateERC165Cache} with the contract address.
     *  @param account Address of the contract to check.
     *  @param interfaceId ERC165 interface to check.
     *  @return True if `account` implements `interfaceId`, false otherwise.
     */
    function implementsERC165Interface(address account, bytes4 interfaceId) external view returns (bool);

    /**
     *  @notice Checks whether a contract implements an ERC165 interface or not without using nor updating the cache.
     *  @param account Address of the contract to check.
     *  @param interfaceId ERC165 interface to check.
     *  @return True if `account` implements `interfaceId`, false otherwise.
     */
    function implementsERC165InterfaceNoCache(address account, bytes4 interfaceId) external view returns (bool);

    event InterfaceImplementerSet(address indexed account, bytes32 indexed interfaceHash, address indexed implementer);

    event ManagerChanged(address indexed account, address indexed newManager);
}

/**
 * @dev Interface of the ERC777TokensRecipient standard as defined in the EIP.
 *
 * Accounts can be notified of {IERC777} tokens being sent to them by having a
 * contract implement this interface (contract holders can be their own
 * implementer) and registering it on the
 * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 global registry].
 *
 * See {IERC1820Registry} and {ERC1820Implementer}.
 */
interface IERC777Recipient {
    /**
     * @dev Called by an {IERC777} token contract whenever tokens are being
     * moved or created into a registered account (`to`). The type of operation
     * is conveyed by `from` being the zero address or not.
     *
     * This call occurs _after_ the token contract's state is updated, so
     * {IERC777-balanceOf}, etc., can be used to query the post-operation state.
     *
     * This function may revert to prevent the operation from being executed.
     */
    function tokensReceived(
        address operator,
        address from,
        address to,
        uint256 amount,
        bytes calldata userData,
        bytes calldata operatorData
    ) external;
}

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

// taken from here: https://github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/libraries/UniswapV2Library.sol
library UniswapV2Library {
    using SafeMath for uint256;

    // given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) internal pure returns (uint256 amountOut) {
        require(amountIn > 0, "UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT");
        require(reserveIn > 0 && reserveOut > 0, "UniswapV2Library: INSUFFICIENT_LIQUIDITY");
        uint256 amountInWithFee = amountIn.mul(997);
        uint256 numerator = amountInWithFee.mul(reserveOut);
        uint256 denominator = reserveIn.mul(1000).add(amountInWithFee);
        amountOut = numerator / denominator;
    }

    /**
     * @author allemanfredi
     * @notice given an input amount, returns the output
     *         amount with slippage and with fees. This fx is
     *         to check approximately onchain the slippage
     *         during a swap
     */
    function calculateSlippageAmountWithFees(
        uint256 _amountIn,
        uint256 _allowedSlippage,
        uint256 _rateIn,
        uint256 _rateOut
    ) internal pure returns (uint256) {
        require(_amountIn > 0, "UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT");
        uint256 slippageAmount = _amountIn
            .mul(_rateOut)
            .div(_rateIn)
            .mul(10000 - _allowedSlippage)
            .div(10000);
        // NOTE: remove fees
        return slippageAmount.mul(997).div(1000);
    }

    /**
     * @author allemanfredi
     * @notice given 2 inputs amount, it returns the
     *         rate percentage between the 2 amounts
     */
    function calculateRate(uint256 _amountIn, uint256 _amountOut) internal pure returns (uint256) {
        require(_amountIn > 0, "UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT");
        require(_amountOut > 0, "UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT");
        return
            _amountIn > _amountOut
                ? (10000 * _amountIn).sub(10000 * _amountOut).div(_amountIn)
                : (10000 * _amountOut).sub(10000 * _amountIn).div(_amountOut);
    }
}

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

contract IRewardDistributionRecipient is Ownable {
    address public rewardDistribution;

    function notifyRewardAmount(uint256 reward) external;

    modifier onlyRewardDistribution() {
        require(_msgSender() == rewardDistribution, "Caller is not reward distribution");
        _;
    }

    function setRewardDistribution(address _rewardDistribution) external onlyOwner {
        rewardDistribution = _rewardDistribution;
    }
}

contract LPTokenWrapper {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    IERC20 public uniV2;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    event Approval(address indexed owner, address indexed spender, uint256 value);

    constructor(address _uniV2) public {
        uniV2 = IERC20(_uniV2);
    }

    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    function stakeFor(address _user, uint256 _amount) public {
        _stake(_user, _amount);
    }

    function stake(uint256 _amount) public {
        _stake(msg.sender, _amount);
    }

    function approve(address _user, uint256 _amount) public {
        _approve(msg.sender, _user, _amount);
    }

    function withdraw(uint256 _amount) public {
        _withdraw(msg.sender, _amount);
    }

    function withdrawFrom(address _user, uint256 _amount) public {
        _withdraw(_user, _amount);
        _approve(
            _user,
            msg.sender,
            _allowances[_user][msg.sender].sub(
                _amount,
                "LPTokenWrapper: transfer amount exceeds allowance"
            )
        );
    }

    function allowance(address _owner, address _spender) public view returns (uint256) {
        return _allowances[_owner][_spender];
    }

    function _stake(address _user, uint256 _amount) internal {
        _totalSupply = _totalSupply.add(_amount);
        _balances[_user] = _balances[_user].add(_amount);
        uniV2.safeTransferFrom(msg.sender, address(this), _amount);
    }

    function _withdraw(address _owner, uint256 _amount) internal {
        _totalSupply = _totalSupply.sub(_amount);
        _balances[_owner] = _balances[_owner].sub(_amount);
        IERC20(uniV2).safeTransfer(msg.sender, _amount);
    }

    function _approve(
        address _owner,
        address _user,
        uint256 _amount
    ) internal returns (bool) {
        require(_user != address(0), "LPTokenWrapper: approve to the zero address");
        _allowances[_owner][_user] = _amount;
        emit Approval(_owner, _user, _amount);
        return true;
    }
}

contract ModifiedUnipool is LPTokenWrapper, IRewardDistributionRecipient {
    address public rewardToken;
    uint256 public constant DURATION = 7 days;

    uint256 public periodFinish = 0;
    uint256 public rewardRate = 0;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;
    mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;

    event RewardAdded(uint256 reward);
    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);

    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

    constructor(address _rewardToken, address _uniV2) public LPTokenWrapper(_uniV2) {
        rewardToken = _rewardToken;
    }

    function notifyRewardAmount(uint256 reward)
        external
        onlyRewardDistribution
        updateReward(address(0))
    {
        if (block.timestamp >= periodFinish) {
            rewardRate = reward.div(DURATION);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = reward.add(leftover).div(DURATION);
        }
        lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp.add(DURATION);
        emit RewardAdded(reward);
    }

    function exit() external {
        withdraw(balanceOf(msg.sender));
        getReward(msg.sender);
    }

    function lastTimeRewardApplicable() public view returns (uint256) {
        return Math.min(block.timestamp, periodFinish);
    }

    function rewardPerToken() public view returns (uint256) {
        if (totalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(
                    totalSupply()
                )
            );
    }

    function earned(address account) public view returns (uint256) {
        return
            balanceOf(account)
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    function stake(uint256 amount) public updateReward(msg.sender) {
        require(amount > 0, "Cannot stake 0");
        super.stake(amount);
        emit Staked(msg.sender, amount);
    }

    function stakeFor(address _user, uint256 _amount) public updateReward(_user) {
        require(_amount > 0, "Cannot stake 0");
        super.stakeFor(_user, _amount);
        emit Staked(_user, _amount);
    }

    function withdraw(uint256 amount) public updateReward(msg.sender) {
        require(amount > 0, "Cannot withdraw 0");
        super.withdraw(amount);
        emit Withdrawn(msg.sender, amount);
    }

    function withdrawFrom(address _user, uint256 amount) public updateReward(_user) {
        require(amount > 0, "Cannot withdraw 0");
        super.withdrawFrom(_user, amount);
        emit Withdrawn(_user, amount);
    }

    function getReward() public {
        _getReward(msg.sender);
    }

    function getReward(address _user) public {
        _getReward(_user);
    }

    function _getReward(address _user) internal updateReward(_user) {
        uint256 reward = earned(_user);
        if (reward > 0) {
            rewards[_user] = 0;
            IERC20(rewardToken).safeTransfer(_user, reward);
            emit RewardPaid(_user, reward);
        }
    }
}

contract RewardedWbtcPbtcUniV2Pair is IERC777Recipient, Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // prettier-ignore
    IERC1820Registry private _erc1820 = IERC1820Registry(0x1820a4B7618BdE71Dce8cdc73aAB6C95905faD24);
    bytes32 private constant TOKENS_RECIPIENT_INTERFACE_HASH = keccak256("ERC777TokensRecipient");

    IERC20 public wbtc;
    IERC20 public pbtc;
    IUniswapV2Pair public uniV2;
    ModifiedUnipool public modifiedUnipool;

    uint256 public allowedSlippage;
    uint256 public allowedRate;

    event Staked(address indexed user, uint256 amount);
    event Unstaked(address indexed user, uint256 amount);
    event AllowedSlippageChanged(uint256 slippage);
    event AllowedRateChanged(uint256 allowedRate);

    /**
     * @param _uniV2 UniV2Pair address
     * @param _modifiedUnipool ModifiedUnipool address
     */
    constructor(address _uniV2, address _modifiedUnipool) public {
        require(Address.isContract(_uniV2), "RewardedWbtcPbtcUniV2Pair: _uniV2 not a contract");

        uniV2 = IUniswapV2Pair(_uniV2);
        modifiedUnipool = ModifiedUnipool(_modifiedUnipool);
        wbtc = IERC20(uniV2.token0());
        pbtc = IERC20(uniV2.token1());
        _erc1820.setInterfaceImplementer(
            address(this),
            TOKENS_RECIPIENT_INTERFACE_HASH,
            address(this)
        );
    }

    /**
     *  @param _allowedSlippage new max allowed in percentage
     */
    function setAllowedSlippage(uint256 _allowedSlippage) external onlyOwner {
        allowedSlippage = _allowedSlippage;
        emit AllowedSlippageChanged(_allowedSlippage);
    }

    /**
     *  @param _allowedRate new allowedRate in percentage
     */
    function setAllowedRate(uint256 _allowedRate) external onlyOwner {
        allowedRate = _allowedRate;
        emit AllowedRateChanged(_allowedRate);
    }

    /**
     * @notice ERC777 hook invoked when this contract receives a token.
     */
    function tokensReceived(
        address _operator,
        address _from,
        address _to,
        uint256 _amount,
        bytes calldata _userData,
        bytes calldata _operatorData
    ) external {
        // NOTE: avoid tx fail during uniV2.burn(address(this))
        if (_from == address(uniV2)) return;

        require(msg.sender == address(pbtc), "RewardedWbtcPbtcUniV2Pair: Invalid token");
        require(_amount > 0, "RewardedWbtcPbtcUniV2Pair: amount must be greater than 0");
        _stakeFor(_from, _amount);
    }

    /**
     * @notice Burn all user's UniV2 staked in the ModifiedUnipool,
     *         swap the corresponding amount of WBTC into PBTC, collect
     *         rewards matured from the UniV2 staking and sent it to msg.sender.
     *         User must approve this contract to to withdraw the corresponing
     *         amount of his UniV2 balance in behalf of him.
     */
    function unstake() public returns (bool) {
        uint256 uniV2SenderBalance = modifiedUnipool.balanceOf(msg.sender);
        require(
            modifiedUnipool.allowance(msg.sender, address(this)) >= uniV2SenderBalance,
            "RewardedWbtcPbtcUniV2Pair: amount not approved"
        );

        modifiedUnipool.withdrawFrom(msg.sender, uniV2SenderBalance);
        modifiedUnipool.getReward(msg.sender);

        uniV2.transfer(address(uniV2), uniV2SenderBalance);
        (uint256 wbtcAmount, uint256 pbtcAmount) = uniV2.burn(address(this));

        (uint256 wbtcReserve, uint256 pbtcReserve, ) = uniV2.getReserves();
        uint256 pbtcAmountOut = UniswapV2Library.getAmountOut(wbtcAmount, wbtcReserve, pbtcReserve);

        wbtc.safeTransfer(address(uniV2), wbtcAmount);
        uniV2.swap(0, pbtcAmountOut, address(this), "");

        uint256 pbtcTotalAmount = pbtcAmount + pbtcAmountOut;
        pbtc.safeTransfer(msg.sender, pbtcTotalAmount);

        emit Unstaked(msg.sender, pbtcTotalAmount);
        return true;
    }

    /**
     * @notice Swap _amount / 2 pBTC sent to this contract
     *         into WBTC and put them into a pBTC/WBTC Uniswap pool.
     *         The amount of UniV2 token will be sent to ModifiedUnipool
     *         in order to mature reward.
     * @param _user address of the user who will have UniV2 tokens in ModifiedUnipool
     * @param _amount amount of pbtc to use to perform this operation
     */
    function _stakeFor(address _user, uint256 _amount) internal {
        uint256 pbtcAmountIn = _amount / 2;
        (uint256 wbtcReserve, uint256 pbtcReserve, ) = uniV2.getReserves();

        uint256 wbtcAmountOut = UniswapV2Library.getAmountOut(
            pbtcAmountIn,
            pbtcReserve,
            wbtcReserve
        );

        require(
            UniswapV2Library.calculateRate(
                pbtcAmountIn,
                wbtcAmountOut.mul(10**10) // 10^18 / 10^8
            ) <= allowedRate,
            "RewardedWbtcPbtcUniV2Pair: rate too high"
        );

        require(
            wbtcAmountOut >=
                UniswapV2Library.calculateSlippageAmountWithFees(
                    pbtcAmountIn,
                    allowedSlippage,
                    10**18,
                    10**8
                ),
            "RewardedWbtcPbtcUniV2Pair: too much slippage"
        );

        pbtc.safeTransfer(address(uniV2), pbtcAmountIn);
        uniV2.swap(wbtcAmountOut, 0, address(this), "");

        pbtc.safeTransfer(address(uniV2), pbtcAmountIn);
        wbtc.safeTransfer(address(uniV2), wbtcAmountOut);
        uint256 liquidity = uniV2.mint(address(this));

        uniV2.approve(address(modifiedUnipool), liquidity);
        modifiedUnipool.stakeFor(_user, liquidity);

        emit Staked(_user, _amount);
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000009f8d8df26d5ab71b492ddce9799f432e36c289df0000000000000000000000007c43ea3bb6921e9b1ac53ba06f196efd296b3fa8

-----Decoded View---------------
Arg [0] : _uniV2 (address): 0x9f8D8Df26d5ab71b492DdCe9799f432E36C289DF
Arg [1] : _modifiedUnipool (address): 0x7c43Ea3bB6921E9B1AC53Ba06f196eFD296b3fa8

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000009f8d8df26d5ab71b492ddce9799f432e36c289df
Arg [1] : 0000000000000000000000007c43ea3bb6921e9b1ac53ba06f196efd296b3fa8