Contract

Contract Source Code (Solidity)

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• library Math
•    - function max(uint256 a, uint256 b)
•    - function min(uint256 a, uint256 b)
•    - function average(uint256 a, uint256 b ...
• interface IVat
•    - function hope(address)
•    - function nope(address)
•    - function live()
•    - function ilks(bytes32)
•    - function urns(bytes32, address)
•    - function gem(bytes32, address)
•    - function frob(bytes32, address, addre ...
•    - function fork(bytes32, address, addre ...
•    - function move(address, address, uint)
•    - function flux(bytes32, address, addre ...
• interface IPot
•    - function chi()
•    - function pie(address)
•    - function rho()
•    - function drip()
•    - function join(uint256)
•    - function exit(uint256)
• 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, ...
• interface IWeth
•    - function deposit()
•    - function withdraw(uint)
•    - function approve(address, uint)
•    - function transfer(address, uint)
•    - function transferFrom(address, addres ...
• interface IGemJoin
•    - function rely(address usr)
•    - function deny(address usr)
•    - function cage()
•    - function join(address usr, uint WAD)
•    - function exit(address usr, uint WAD)
• interface IDaiJoin
•    - function rely(address usr)
•    - function deny(address usr)
•    - function cage()
•    - function join(address usr, uint WAD)
•    - function exit(address usr, uint WAD)
• interface IChai
•    - function balanceOf(address account)
•    - function transfer(address dst, uint w ...
•    - function move(address src, address ds ...
•    - function transferFrom(address src, ad ...
•    - function approve(address usr, uint wa ...
•    - function dai(address usr)
•    - function join(address dst, uint wad)
•    - function exit(address src, uint wad)
•    - function draw(address src, uint wad)
•    - function permit(address holder, addre ...
•    - function nonces(address account)
• interface ITreasury
•    - function debt()
•    - function savings()
•    - function pushDai(address user, uint25 ...
•    - function pullDai(address user, uint25 ...
•    - function pushChai(address user, uint2 ...
•    - function pullChai(address user, uint2 ...
•    - function pushWeth(address to, uint256 ...
•    - function pullWeth(address to, uint256 ...
•    - function shutdown()
•    - function live()
•    - function vat()
•    - function weth()
•    - function dai()
•    - function daiJoin()
•    - function wethJoin()
•    - function pot()
•    - function chai()
• interface IERC2612
•    - function permit(address owner, addres ...
•    - function nonces(address owner)
• interface IFYDai is IERC20, IERC2612
•    - function isMature()
•    - function maturity()
•    - function chi0()
•    - function rate0()
•    - function chiGrowth()
•    - function rateGrowth()
•    - function mature()
•    - function unlocked()
•    - function mint(address, uint)
•    - function burn(address, uint)
•    - function flashMint(uint, bytes callda ...
•    - function redeem(address, address, uin ...
• interface IFlashMinter
•    - function executeOnFlashMint(uint256 f ...
• interface IDelegable
•    - function addDelegate(address)
•    - function addDelegateBySignature(addre ...
•  contract Delegable is IDelegable
•    - function addDelegate(address delegate ...
•    - function revokeDelegate(address deleg ...
•    - function addDelegateBySignature(addre ...
•    - function _addDelegate(address user, a ...
•    - function _revokeDelegate(address user ...
• 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 ...
•  contract DecimalMath
•    - function muld(uint256 x, uint256 y)
•    - function divd(uint256 x, uint256 y)
•    - function muldrup(uint256 x, uint256 y ...
•    - function divdrup(uint256 x, uint256 y ...
•    - function _msgSender()
•    - function _msgData()
•  contract Ownable is Context
•    - function owner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•  contract Orchestrated is Ownable
•    - function orchestrate(address user, by ...
•    - function batchOrchestrate(address use ...
• library Address
•    - function isContract(address account)
•    - function sendValue(address payable re ...
•    - function functionCall(address target, ...
•    - function functionCall(address target, ...
•    - function functionCallWithValue(addres ...
•    - function functionCallWithValue(addres ...
•    - function _functionCallWithValue(addre ...
•  contract ERC20 is Context, IERC20
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
•    - function increaseAllowance(address sp ...
•    - function decreaseAllowance(address sp ...
•    - function _transfer(address sender, ad ...
•    - function _mint(address account, uint2 ...
•    - function _burn(address account, uint2 ...
•    - function _approve(address owner, addr ...
•    - function _setupDecimals(uint8 decimal ...
•    - function _beforeTokenTransfer(address ...
•    - function permit(address owner, addres ...
•  contract FYDai is IFYDai, Orchestr ... *
•    - function chiGrowth()
•    - function rateGrowth()
•    - function mature()
•    - function redeem(address from, address ...
•    - function flashMint(uint256 fyDaiAmoun ...
•    - function mint(address to, uint256 fyD ...
•    - function burn(address from, uint256 f ...
•    - function _mint(address to, uint256 fy ...

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/**
 *Submitted for verification at Etherscan.io on 2020-10-16
*/

// File: @openzeppelin/contracts/math/Math.sol


pragma solidity ^0.6.0;

/**
 * @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);
    }
}

// File: contracts/interfaces/IVat.sol

pragma solidity ^0.6.10;


/// @dev Interface to interact with the vat contract from MakerDAO
/// Taken from https://github.com/makerdao/developerguides/blob/master/devtools/working-with-dsproxy/working-with-dsproxy.md
interface IVat {
    // function can(address, address) external view returns (uint);
    function hope(address) external;
    function nope(address) external;
    function live() external view returns (uint);
    function ilks(bytes32) external view returns (uint, uint, uint, uint, uint);
    function urns(bytes32, address) external view returns (uint, uint);
    function gem(bytes32, address) external view returns (uint);
    // function dai(address) external view returns (uint);
    function frob(bytes32, address, address, address, int, int) external;
    function fork(bytes32, address, address, int, int) external;
    function move(address, address, uint) external;
    function flux(bytes32, address, address, uint) external;
}

// File: contracts/interfaces/IPot.sol

pragma solidity ^0.6.10;


/// @dev interface for the pot contract from MakerDao
/// Taken from https://github.com/makerdao/developerguides/blob/master/dai/dsr-integration-guide/dsr.sol
interface IPot {
    function chi() external view returns (uint256);
    function pie(address) external view returns (uint256); // Not a function, but a public variable.
    function rho() external returns (uint256);
    function drip() external returns (uint256);
    function join(uint256) external;
    function exit(uint256) external;
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


pragma solidity ^0.6.0;

/**
 * @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);
}

// File: contracts/interfaces/IWeth.sol

pragma solidity ^0.6.10;


interface IWeth {
    function deposit() external payable;
    function withdraw(uint) external;
    function approve(address, uint) external returns (bool) ;
    function transfer(address, uint) external returns (bool);
    function transferFrom(address, address, uint) external returns (bool);
}

// File: contracts/interfaces/IGemJoin.sol

pragma solidity ^0.6.10;


/// @dev Interface to interact with the `Join.sol` contract from MakerDAO using ERC20
interface IGemJoin {
    function rely(address usr) external;
    function deny(address usr) external;
    function cage() external;
    function join(address usr, uint WAD) external;
    function exit(address usr, uint WAD) external;
}

// File: contracts/interfaces/IDaiJoin.sol

pragma solidity ^0.6.10;


/// @dev Interface to interact with the `Join.sol` contract from MakerDAO using Dai
interface IDaiJoin {
    function rely(address usr) external;
    function deny(address usr) external;
    function cage() external;
    function join(address usr, uint WAD) external;
    function exit(address usr, uint WAD) external;
}

// File: contracts/interfaces/IChai.sol

pragma solidity ^0.6.10;


/// @dev interface for the chai contract
/// Taken from https://github.com/makerdao/developerguides/blob/master/dai/dsr-integration-guide/dsr.sol
interface IChai {
    function balanceOf(address account) external view returns (uint256);
    function transfer(address dst, uint wad) external returns (bool);
    function move(address src, address dst, uint wad) external returns (bool);
    function transferFrom(address src, address dst, uint wad) external returns (bool);
    function approve(address usr, uint wad) external returns (bool);
    function dai(address usr) external returns (uint wad);
    function join(address dst, uint wad) external;
    function exit(address src, uint wad) external;
    function draw(address src, uint wad) external;
    function permit(address holder, address spender, uint256 nonce, uint256 expiry, bool allowed, uint8 v, bytes32 r, bytes32 s) external;
    function nonces(address account) external view returns (uint256);
}

// File: contracts/interfaces/ITreasury.sol

pragma solidity ^0.6.10;








interface ITreasury {
    function debt() external view returns(uint256);
    function savings() external view returns(uint256);
    function pushDai(address user, uint256 dai) external;
    function pullDai(address user, uint256 dai) external;
    function pushChai(address user, uint256 chai) external;
    function pullChai(address user, uint256 chai) external;
    function pushWeth(address to, uint256 weth) external;
    function pullWeth(address to, uint256 weth) external;
    function shutdown() external;
    function live() external view returns(bool);

    function vat() external view returns (IVat);
    function weth() external view returns (IWeth);
    function dai() external view returns (IERC20);
    function daiJoin() external view returns (IDaiJoin);
    function wethJoin() external view returns (IGemJoin);
    function pot() external view returns (IPot);
    function chai() external view returns (IChai);
}

// File: contracts/interfaces/IERC2612.sol

// Code adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2237/
pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC2612 standard as defined in the EIP.
 *
 * Adds the {permit} method, which can be used to change one's
 * {IERC20-allowance} without having to send a transaction, by signing a
 * message. This allows users to spend tokens without having to hold Ether.
 *
 * See https://eips.ethereum.org/EIPS/eip-2612.
 */
interface IERC2612 {
    /**
     * @dev Sets `amount` as the allowance of `spender` over `owner`'s tokens,
     * given `owner`'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;

    /**
     * @dev Returns the current ERC2612 nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);
}

// File: contracts/interfaces/IFYDai.sol

pragma solidity ^0.6.10;



interface IFYDai is IERC20, IERC2612 {
    function isMature() external view returns(bool);
    function maturity() external view returns(uint);
    function chi0() external view returns(uint);
    function rate0() external view returns(uint);
    function chiGrowth() external view returns(uint);
    function rateGrowth() external view returns(uint);
    function mature() external;
    function unlocked() external view returns (uint);
    function mint(address, uint) external;
    function burn(address, uint) external;
    function flashMint(uint, bytes calldata) external;
    function redeem(address, address, uint256) external returns (uint256);
    // function transfer(address, uint) external returns (bool);
    // function transferFrom(address, address, uint) external returns (bool);
    // function approve(address, uint) external returns (bool);
}

// File: contracts/interfaces/IFlashMinter.sol

pragma solidity ^0.6.10;


interface IFlashMinter {
    function executeOnFlashMint(uint256 fyDaiAmount, bytes calldata data) external;
}

// File: contracts/interfaces/IDelegable.sol

pragma solidity ^0.6.10;


interface IDelegable {
    function addDelegate(address) external;
    function addDelegateBySignature(address, address, uint, uint8, bytes32, bytes32) external;
}

// File: contracts/helpers/Delegable.sol

pragma solidity ^0.6.10;



/// @dev Delegable enables users to delegate their account management to other users.
/// Delegable implements addDelegateBySignature, to add delegates using a signature instead of a separate transaction.
contract Delegable is IDelegable {
    event Delegate(address indexed user, address indexed delegate, bool enabled);

    // keccak256("Signature(address user,address delegate,uint256 nonce,uint256 deadline)");
    bytes32 public immutable SIGNATURE_TYPEHASH = 0x0d077601844dd17f704bafff948229d27f33b57445915754dfe3d095fda2beb7;
    bytes32 public immutable DELEGABLE_DOMAIN;
    mapping(address => uint) public signatureCount;

    mapping(address => mapping(address => bool)) public delegated;

    constructor () public {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }

        DELEGABLE_DOMAIN = keccak256(
            abi.encode(
                keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
                keccak256(bytes('Yield')),
                keccak256(bytes('1')),
                chainId,
                address(this)
            )
        );
    }

    /// @dev Require that msg.sender is the account holder or a delegate
    modifier onlyHolderOrDelegate(address holder, string memory errorMessage) {
        require(
            msg.sender == holder || delegated[holder][msg.sender],
            errorMessage
        );
        _;
    }

    /// @dev Enable a delegate to act on the behalf of caller
    function addDelegate(address delegate) public override {
        _addDelegate(msg.sender, delegate);
    }

    /// @dev Stop a delegate from acting on the behalf of caller
    function revokeDelegate(address delegate) public {
        _revokeDelegate(msg.sender, delegate);
    }

    /// @dev Add a delegate through an encoded signature
    function addDelegateBySignature(address user, address delegate, uint deadline, uint8 v, bytes32 r, bytes32 s) public override {
        require(deadline >= block.timestamp, 'Delegable: Signature expired');

        bytes32 hashStruct = keccak256(
            abi.encode(
                SIGNATURE_TYPEHASH,
                user,
                delegate,
                signatureCount[user]++,
                deadline
            )
        );

        bytes32 digest = keccak256(
            abi.encodePacked(
                '\x19\x01',
                DELEGABLE_DOMAIN,
                hashStruct
            )
        );
        address signer = ecrecover(digest, v, r, s);
        require(
            signer != address(0) && signer == user,
            'Delegable: Invalid signature'
        );

        _addDelegate(user, delegate);
    }

    /// @dev Enable a delegate to act on the behalf of an user
    function _addDelegate(address user, address delegate) internal {
        require(!delegated[user][delegate], "Delegable: Already delegated");
        delegated[user][delegate] = true;
        emit Delegate(user, delegate, true);
    }

    /// @dev Stop a delegate from acting on the behalf of an user
    function _revokeDelegate(address user, address delegate) internal {
        require(delegated[user][delegate], "Delegable: Already undelegated");
        delegated[user][delegate] = false;
        emit Delegate(user, delegate, false);
    }
}

// File: @openzeppelin/contracts/math/SafeMath.sol


pragma solidity ^0.6.0;

/**
 * @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;
    }
}

// File: contracts/helpers/DecimalMath.sol

pragma solidity ^0.6.10;



/// @dev Implements simple fixed point math mul and div operations for 27 decimals.
contract DecimalMath {
    using SafeMath for uint256;

    uint256 constant public UNIT = 1e27;

    /// @dev Multiplies x and y, assuming they are both fixed point with 27 digits.
    function muld(uint256 x, uint256 y) internal pure returns (uint256) {
        return x.mul(y).div(UNIT);
    }

    /// @dev Divides x between y, assuming they are both fixed point with 27 digits.
    function divd(uint256 x, uint256 y) internal pure returns (uint256) {
        return x.mul(UNIT).div(y);
    }

    /// @dev Multiplies x and y, rounding up to the closest representable number.
    /// Assumes x and y are both fixed point with `decimals` digits.
    function muldrup(uint256 x, uint256 y) internal pure returns (uint256)
    {
        uint256 z = x.mul(y);
        return z.mod(UNIT) == 0 ? z.div(UNIT) : z.div(UNIT).add(1);
    }

    /// @dev Divides x between y, rounding up to the closest representable number.
    /// Assumes x and y are both fixed point with `decimals` digits.
    function divdrup(uint256 x, uint256 y) internal pure returns (uint256)
    {
        uint256 z = x.mul(UNIT);
        return z.mod(y) == 0 ? z.div(y) : z.div(y).add(1);
    }
}

// File: @openzeppelin/contracts/GSN/Context.sol


pragma solidity ^0.6.0;

/*
 * @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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


pragma solidity ^0.6.0;

/**
 * @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.
 */
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;
    }
}

// File: contracts/helpers/Orchestrated.sol

pragma solidity ^0.6.10;



/**
 * @dev Orchestrated allows to define static access control between multiple contracts.
 * This contract would be used as a parent contract of any contract that needs to restrict access to some methods,
 * which would be marked with the `onlyOrchestrated` modifier.
 * During deployment, the contract deployer (`owner`) can register any contracts that have privileged access by calling `orchestrate`.
 * Once deployment is completed, `owner` should call `transferOwnership(address(0))` to avoid any more contracts ever gaining privileged access.
 */

contract Orchestrated is Ownable {
    event GrantedAccess(address access, bytes4 signature);

    mapping(address => mapping (bytes4 => bool)) public orchestration;

    constructor () public Ownable() {}

    /// @dev Restrict usage to authorized users
    /// @param err The error to display if the validation fails 
    modifier onlyOrchestrated(string memory err) {
        require(orchestration[msg.sender][msg.sig], err);
        _;
    }

    /// @dev Add orchestration
    /// @param user Address of user or contract having access to this contract.
    /// @param signature bytes4 signature of the function we are giving orchestrated access to.
    /// It seems to me a bad idea to give access to humans, and would use this only for predictable smart contracts.
    function orchestrate(address user, bytes4 signature) public onlyOwner {
        orchestration[user][signature] = true;
        emit GrantedAccess(user, signature);
    }

    /// @dev Adds orchestration for the provided function signatures
    function batchOrchestrate(address user, bytes4[] memory signatures) public onlyOwner {
        for (uint256 i = 0; i < signatures.length; i++) {
            orchestrate(user, signatures[i]);
        }
    }
}

// File: @openzeppelin/contracts/utils/Address.sol


pragma solidity ^0.6.2;

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

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

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

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

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

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

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

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol


pragma solidity ^0.6.0;





/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// File: contracts/helpers/ERC20Permit.sol

// Adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/53516bc555a454862470e7860a9b5254db4d00f5/contracts/token/ERC20/ERC20Permit.sol
pragma solidity ^0.6.0;



/**
 * @dev Extension of {ERC20} that allows token holders to use their tokens
 * without sending any transactions by setting {IERC20-allowance} with a
 * signature using the {permit} method, and then spend them via
 * {IERC20-transferFrom}.
 *
 * The {permit} signature mechanism conforms to the {IERC2612} interface.
 */
abstract contract ERC20Permit is ERC20, IERC2612 {
    mapping (address => uint256) public override nonces;

    bytes32 public immutable PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public immutable DOMAIN_SEPARATOR;

    constructor(string memory name_, string memory symbol_) internal ERC20(name_, symbol_) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }

        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name_)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }

    /**
     * @dev See {IERC2612-permit}.
     *
     * In cases where the free option is not a concern, deadline can simply be
     * set to uint(-1), so it should be seen as an optional parameter
     */
    function permit(address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public virtual override {
        require(deadline >= block.timestamp, "ERC20Permit: expired deadline");

        bytes32 hashStruct = keccak256(
            abi.encode(
                PERMIT_TYPEHASH,
                owner,
                spender,
                amount,
                nonces[owner]++,
                deadline
            )
        );

        bytes32 hash = keccak256(
            abi.encodePacked(
                '\x19\x01',
                DOMAIN_SEPARATOR,
                hashStruct
            )
        );

        address signer = ecrecover(hash, v, r, s);
        require(
            signer != address(0) && signer == owner,
            "ERC20Permit: invalid signature"
        );

        _approve(owner, spender, amount);
    }
}

// File: contracts/FYDai.sol

pragma solidity ^0.6.10;













/**
 * @dev fyDai is an fyToken targeting Chai.
 * Each fyDai contract has a specific maturity time. One fyDai is worth one Chai at or after maturity time.
 * At maturity, the fyDai can be triggered to mature, which records the current rate and chi from MakerDAO and enables redemption.
 * Redeeming an fyDai means burning it, and the contract will retrieve Dai from Treasury equal to one Dai times the growth in chi since maturity.
 * fyDai also tracks the MakerDAO stability fee accumulator at the time of maturity, and the growth since. This is not used internally.
 * Minting and burning of fyDai is restricted to orchestrated contracts. Redeeming and flash-minting is allowed to anyone.
 */

contract FYDai is IFYDai, Orchestrated(), Delegable(), DecimalMath, ERC20Permit  {

    event Redeemed(address indexed from, address indexed to, uint256 fyDaiIn, uint256 daiOut);
    event Matured(uint256 rate, uint256 chi);

    bytes32 public constant WETH = "ETH-A";

    uint256 constant internal MAX_TIME_TO_MATURITY = 126144000; // seconds in four years

    IVat public vat;
    IPot public pot;
    ITreasury public treasury;

    bool public override isMature;
    uint256 public override maturity;
    uint256 public override chi0;      // Chi at maturity
    uint256 public override rate0;     // Rate at maturity

    uint public override unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'FYDai: Locked');
        unlocked = 0;
        _;
        unlocked = 1;
    }
    
    /// @dev The constructor:
    /// Sets the name and symbol for the fyDai token.
    /// Connects to Vat, Jug, Pot and Treasury.
    /// Sets the maturity date for the fyDai, in unix time.
    /// Initializes chi and rate at maturity time as 1.0 with 27 decimals.
    constructor(
        address treasury_,
        uint256 maturity_,
        string memory name,
        string memory symbol
    ) public ERC20Permit(name, symbol) {
        // solium-disable-next-line security/no-block-members
        require(maturity_ > now && maturity_ < now + MAX_TIME_TO_MATURITY, "FYDai: Invalid maturity");
        treasury = ITreasury(treasury_);
        vat = treasury.vat();
        pot = treasury.pot();
        maturity = maturity_;
        chi0 = UNIT;
        rate0 = UNIT;
    }

    /// @dev Chi differential between maturity and now in RAY. Returns 1.0 if not mature.
    /// If rateGrowth < chiGrowth, returns rate.
    //
    //          chi_now
    // chi() = ---------
    //          chi_mat
    //
    function chiGrowth() public view override returns(uint256){
        if (isMature != true) return chi0;
        return Math.min(rateGrowth(), divd(pot.chi(), chi0)); // Rounding in favour of the protocol
    }

    /// @dev Rate differential between maturity and now in RAY. Returns 1.0 if not mature.
    /// rateGrowth is floored to 1.0.
    //
    //                 rate_now
    // rateGrowth() = ----------
    //                 rate_mat
    //
    function rateGrowth() public view override returns(uint256){
        if (isMature != true) return rate0;
        (, uint256 rate,,,) = vat.ilks(WETH);
        return Math.max(UNIT, divdrup(rate, rate0)); // Rounding in favour of the protocol
    }

    /// @dev Mature fyDai and capture chi and rate
    function mature() public override {
        require(
            // solium-disable-next-line security/no-block-members
            now > maturity,
            "FYDai: Too early to mature"
        );
        require(
            isMature != true,
            "FYDai: Already matured"
        );
        (, rate0,,,) = vat.ilks(WETH); // Retrieve the MakerDAO Vat
        rate0 = Math.max(rate0, UNIT); // Floor it at 1.0
        chi0 = pot.chi();
        isMature = true;
        emit Matured(rate0, chi0);
    }

    /// @dev Burn fyDai and return their dai equivalent value, pulled from the Treasury
    /// During unwind, `treasury.pullDai()` will revert which is right.
    /// `from` needs to tell fyDai to approve the burning of the fyDai tokens.
    /// `from` can delegate to other addresses to redeem his fyDai and put the Dai proceeds in the `to` wallet.
    /// The collateral needed changes according to series maturity and MakerDAO rate and chi, depending on collateral type.
    /// @param from Wallet to burn fyDai from.
    /// @param to Wallet to put the Dai in.
    /// @param fyDaiAmount Amount of fyDai to burn.
    // from --- fyDai ---> us
    // us   --- Dai  ---> to
    function redeem(address from, address to, uint256 fyDaiAmount)
        public onlyHolderOrDelegate(from, "FYDai: Only Holder Or Delegate") lock override 
        returns (uint256)
    {
        require(
            isMature == true,
            "FYDai: fyDai is not mature"
        );
        _burn(from, fyDaiAmount);                              // Burn fyDai from `from`
        uint256 daiAmount = muld(fyDaiAmount, chiGrowth());    // User gets interest for holding after maturity
        treasury.pullDai(to, daiAmount);                     // Give dai to `to`, from Treasury
        emit Redeemed(from, to, fyDaiAmount, daiAmount);
        return daiAmount;
    }

    /// @dev Flash-mint fyDai. Calls back on `IFlashMinter.executeOnFlashMint()`
    /// @param fyDaiAmount Amount of fyDai to mint.
    /// @param data User-defined data to pass on to `executeOnFlashMint()`
    function flashMint(uint256 fyDaiAmount, bytes calldata data) external lock override {
        _mint(msg.sender, fyDaiAmount);
        IFlashMinter(msg.sender).executeOnFlashMint(fyDaiAmount, data);
        _burn(msg.sender, fyDaiAmount);
    }

    /// @dev Mint fyDai. Only callable by Controller contracts.
    /// This function can only be called by other Yield contracts, not users directly.
    /// @param to Wallet to mint the fyDai in.
    /// @param fyDaiAmount Amount of fyDai to mint.
    function mint(address to, uint256 fyDaiAmount) public override onlyOrchestrated("FYDai: Not Authorized") {
        _mint(to, fyDaiAmount);
    }

    /// @dev Burn fyDai. Only callable by Controller contracts.
    /// This function can only be called by other Yield contracts, not users directly.
    /// @param from Wallet to burn the fyDai from.
    /// @param fyDaiAmount Amount of fyDai to burn.
    function burn(address from, uint256 fyDaiAmount) public override onlyOrchestrated("FYDai: Not Authorized") {
        _burn(from, fyDaiAmount);
    }

    /// @dev Creates `fyDaiAmount` tokens and assigns them to `to`, increasing the total supply, up to a limit of 2**112.
    /// @param to Wallet to mint the fyDai in.
    /// @param fyDaiAmount Amount of fyDai to mint.
    function _mint(address to, uint256 fyDaiAmount) internal override {
        super._mint(to, fyDaiAmount);
        require(totalSupply() <= 5192296858534827628530496329220096, "FYDai: Total supply limit exceeded"); // 2**112
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"delegated","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"fyDaiAmount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"flashMint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"isMature","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mature","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"maturity","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"fyDaiAmount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"},{"internalType":"bytes4","name":"signature","type":"bytes4"}],"name":"orchestrate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"bytes4","name":"","type":"bytes4"}],"name":"orchestration","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":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"pot","outputs":[{"internalType":"contract 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

-----Decoded View---------------
Arg [0] : treasury_ (address): 0xFa21DE6f225c25b8F13264f1bFF5e1e44a37F96E
Arg [1] : maturity_ (uint256): 1640995199
Arg [2] : name (string): Yield Dai - 2021-12-31
Arg [3] : symbol (string): fyDai21Dec

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000fa21de6f225c25b8f13264f1bff5e1e44a37f96e
Arg [1] : 0000000000000000000000000000000000000000000000000000000061cf997f
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000016
Arg [5] : 5969656c6420446169202d20323032312d31322d333100000000000000000000
Arg [6] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [7] : 6679446169323144656300000000000000000000000000000000000000000000

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