Contract Source Code:

//SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IAdmin {
    function setAdmin(address _admin) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IVaultPriceFeed {
    function adjustmentBasisPoints(address _token) external view returns (uint256);
    function isAdjustmentAdditive(address _token) external view returns (bool);
    function setAdjustment(address _token, bool _isAdditive, uint256 _adjustmentBps) external;
    function setUseV2Pricing(bool _useV2Pricing) external;
    function setIsAmmEnabled(bool _isEnabled) external;
    function setIsSecondaryPriceEnabled(bool _isEnabled) external;
    function setSpreadBasisPoints(address _token, uint256 _spreadBasisPoints) external;
    function setSpreadThresholdBasisPoints(uint256 _spreadThresholdBasisPoints) external;
    function setFavorPrimaryPrice(bool _favorPrimaryPrice) external;
    function setPriceSampleSpace(uint256 _priceSampleSpace) external;
    function setMaxStrictPriceDeviation(uint256 _maxStrictPriceDeviation) external;
    function getPrice(address _token, bool _maximise, bool _includeAmmPrice, bool _useSwapPricing) external view returns (uint256);
    function getAmmPrice(address _token) external view returns (uint256);
    function getLatestPrimaryPrice(address _token) external view returns (uint256);
    function getPrimaryPrice(address _token, bool _maximise) external view returns (uint256);
    function setTokenConfig(
        address _token,
        address _priceFeed,
        uint256 _priceDecimals,
        bool _isStrictStable
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IFastPriceFeed {
    function lastUpdatedAt() external view returns (uint256);
    function lastUpdatedBlock() external view returns (uint256);
    function setSigner(address _account, bool _isActive) external;
    function setUpdater(address _account, bool _isActive) external;
    function setPriceDuration(uint256 _priceDuration) external;
    function setMaxPriceUpdateDelay(uint256 _maxPriceUpdateDelay) external;
    function setSpreadBasisPointsIfInactive(uint256 _spreadBasisPointsIfInactive) external;
    function setSpreadBasisPointsIfChainError(uint256 _spreadBasisPointsIfChainError) external;
    function setMinBlockInterval(uint256 _minBlockInterval) external;
    function setIsSpreadEnabled(bool _isSpreadEnabled) external;
    function setMaxDeviationBasisPoints(uint256 _maxDeviationBasisPoints) external;
    function setMaxCumulativeDeltaDiffs(address[] memory _tokens,  uint256[] memory _maxCumulativeDeltaDiffs) external;
    function setPriceDataInterval(uint256 _priceDataInterval) external;
    function setVaultPriceFeed(address _vaultPriceFeed) external;
    function setPricesWithBits(uint256 _priceBits, uint256 _timestamp) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IHandlerTarget {
    function isHandler(address _account) external returns (bool);
    function setHandler(address _handler, bool _isActive) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface ITimelockTarget {
    function setGov(address _gov) external;
    function withdrawToken(address _token, address _account, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "./interfaces/ITimelockTarget.sol";
import "./interfaces/IHandlerTarget.sol";
import "../access/interfaces/IAdmin.sol";
import "../core/interfaces/IVaultPriceFeed.sol";
import "../oracle/interfaces/IFastPriceFeed.sol";
import "../referrals/interfaces/IReferralStorage.sol";
import "../tokens/interfaces/IYieldToken.sol";
import "../tokens/interfaces/IBaseToken.sol";
import "../tokens/interfaces/IMintable.sol";
import "../tokens/interfaces/IUSDG.sol";
import "../staking/interfaces/IVester.sol";

import "../libraries/math/SafeMath.sol";
import "../libraries/token/IERC20.sol";

contract PriceFeedTimelock {
    using SafeMath for uint256;

    uint256 public constant MAX_BUFFER = 5 days;

    uint256 public buffer;
    address public admin;

    address public tokenManager;

    mapping (bytes32 => uint256) public pendingActions;

    mapping (address => bool) public isHandler;
    mapping (address => bool) public isKeeper;

    event SignalPendingAction(bytes32 action);
    event SignalApprove(address token, address spender, uint256 amount, bytes32 action);
    event SignalWithdrawToken(address target, address token, address receiver, uint256 amount, bytes32 action);
    event SignalSetGov(address target, address gov, bytes32 action);
    event SignalSetPriceFeedWatcher(address fastPriceFeed, address account, bool isActive);
    event SignalPriceFeedSetTokenConfig(
        address vaultPriceFeed,
        address token,
        address priceFeed,
        uint256 priceDecimals,
        bool isStrictStable
    );
    event ClearAction(bytes32 action);

    modifier onlyAdmin() {
        require(msg.sender == admin, "Timelock: forbidden");
        _;
    }

    modifier onlyHandlerAndAbove() {
        require(msg.sender == admin || isHandler[msg.sender], "Timelock: forbidden");
        _;
    }

    modifier onlyKeeperAndAbove() {
        require(msg.sender == admin || isHandler[msg.sender] || isKeeper[msg.sender], "Timelock: forbidden");
        _;
    }

    modifier onlyTokenManager() {
        require(msg.sender == tokenManager, "Timelock: forbidden");
        _;
    }

    constructor(
        address _admin,
        uint256 _buffer,
        address _tokenManager
    ) public {
        require(_buffer <= MAX_BUFFER, "Timelock: invalid _buffer");
        admin = _admin;
        buffer = _buffer;
        tokenManager = _tokenManager;
    }

    function setAdmin(address _admin) external onlyTokenManager {
        admin = _admin;
    }

    function setExternalAdmin(address _target, address _admin) external onlyAdmin {
        require(_target != address(this), "Timelock: invalid _target");
        IAdmin(_target).setAdmin(_admin);
    }

    function setContractHandler(address _handler, bool _isActive) external onlyAdmin {
        isHandler[_handler] = _isActive;
    }

    function setKeeper(address _keeper, bool _isActive) external onlyAdmin {
        isKeeper[_keeper] = _isActive;
    }

    function setBuffer(uint256 _buffer) external onlyAdmin {
        require(_buffer <= MAX_BUFFER, "Timelock: invalid _buffer");
        // require(_buffer > buffer, "Timelock: buffer cannot be decreased");
        buffer = _buffer;
    }

    function setIsAmmEnabled(address _priceFeed, bool _isEnabled) external onlyAdmin {
        IVaultPriceFeed(_priceFeed).setIsAmmEnabled(_isEnabled);
    }

    function setIsSecondaryPriceEnabled(address _priceFeed, bool _isEnabled) external onlyAdmin {
        IVaultPriceFeed(_priceFeed).setIsSecondaryPriceEnabled(_isEnabled);
    }

    function setMaxStrictPriceDeviation(address _priceFeed, uint256 _maxStrictPriceDeviation) external onlyAdmin {
        IVaultPriceFeed(_priceFeed).setMaxStrictPriceDeviation(_maxStrictPriceDeviation);
    }

    function setUseV2Pricing(address _priceFeed, bool _useV2Pricing) external onlyAdmin {
        IVaultPriceFeed(_priceFeed).setUseV2Pricing(_useV2Pricing);
    }

    function setAdjustment(address _priceFeed, address _token, bool _isAdditive, uint256 _adjustmentBps) external onlyKeeperAndAbove {
        IVaultPriceFeed(_priceFeed).setAdjustment(_token, _isAdditive, _adjustmentBps);
    }

    function setSpreadBasisPoints(address _priceFeed, address _token, uint256 _spreadBasisPoints) external onlyKeeperAndAbove {
        IVaultPriceFeed(_priceFeed).setSpreadBasisPoints(_token, _spreadBasisPoints);
    }

    function setPriceSampleSpace(address _priceFeed,uint256 _priceSampleSpace) external onlyHandlerAndAbove {
        require(_priceSampleSpace <= 5, "Invalid _priceSampleSpace");
        IVaultPriceFeed(_priceFeed).setPriceSampleSpace(_priceSampleSpace);
    }

    function setVaultPriceFeed(address _fastPriceFeed, address _vaultPriceFeed) external onlyAdmin {
        IFastPriceFeed(_fastPriceFeed).setVaultPriceFeed(_vaultPriceFeed);
    }

    function setPriceDuration(address _fastPriceFeed, uint256 _priceDuration) external onlyHandlerAndAbove {
        IFastPriceFeed(_fastPriceFeed).setPriceDuration(_priceDuration);
    }

    function setMaxPriceUpdateDelay(address _fastPriceFeed, uint256 _maxPriceUpdateDelay) external onlyHandlerAndAbove {
        IFastPriceFeed(_fastPriceFeed).setMaxPriceUpdateDelay(_maxPriceUpdateDelay);
    }

    function setSpreadBasisPointsIfInactive(address _fastPriceFeed, uint256 _spreadBasisPointsIfInactive) external onlyAdmin {
        IFastPriceFeed(_fastPriceFeed).setSpreadBasisPointsIfInactive(_spreadBasisPointsIfInactive);
    }

    function setSpreadBasisPointsIfChainError(address _fastPriceFeed, uint256 _spreadBasisPointsIfChainError) external onlyAdmin {
        IFastPriceFeed(_fastPriceFeed).setSpreadBasisPointsIfChainError(_spreadBasisPointsIfChainError);
    }

    function setMinBlockInterval(address _fastPriceFeed, uint256 _minBlockInterval) external onlyAdmin {
        IFastPriceFeed(_fastPriceFeed).setMinBlockInterval(_minBlockInterval);
    }

    function setIsSpreadEnabled(address _fastPriceFeed, bool _isSpreadEnabled) external onlyAdmin {
        IFastPriceFeed(_fastPriceFeed).setIsSpreadEnabled(_isSpreadEnabled);
    }

    function transferIn(address _sender, address _token, uint256 _amount) external onlyAdmin {
        IERC20(_token).transferFrom(_sender, address(this), _amount);
    }

    function signalApprove(address _token, address _spender, uint256 _amount) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("approve", _token, _spender, _amount));
        _setPendingAction(action);
        emit SignalApprove(_token, _spender, _amount, action);
    }

    function approve(address _token, address _spender, uint256 _amount) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("approve", _token, _spender, _amount));
        _validateAction(action);
        _clearAction(action);
        IERC20(_token).approve(_spender, _amount);
    }

    function signalWithdrawToken(address _target, address _token, address _receiver, uint256 _amount) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("withdrawToken", _target, _token, _receiver, _amount));
        _setPendingAction(action);
        emit SignalWithdrawToken(_target, _token, _receiver, _amount, action);
    }

    function withdrawToken(address _target, address _token, address _receiver, uint256 _amount) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("withdrawToken", _target, _token, _receiver, _amount));
        _validateAction(action);
        _clearAction(action);
        IBaseToken(_target).withdrawToken(_token, _receiver, _amount);
    }

    function signalSetGov(address _target, address _gov) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setGov", _target, _gov));
        _setPendingAction(action);
        emit SignalSetGov(_target, _gov, action);
    }

    function setGov(address _target, address _gov) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setGov", _target, _gov));
        _validateAction(action);
        _clearAction(action);
        ITimelockTarget(_target).setGov(_gov);
    }

    function signalSetPriceFeedWatcher(address _fastPriceFeed, address _account, bool _isActive) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setPriceFeedWatcher", _fastPriceFeed, _account, _isActive));
        _setPendingAction(action);
        emit SignalSetPriceFeedWatcher(_fastPriceFeed, _account, _isActive);
    }

    function setPriceFeedWatcher(address _fastPriceFeed, address _account, bool _isActive) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setPriceFeedWatcher", _fastPriceFeed, _account, _isActive));
        _validateAction(action);
        _clearAction(action);
        IFastPriceFeed(_fastPriceFeed).setSigner(_account, _isActive);
    }

    function signalSetPriceFeedUpdater(address _fastPriceFeed, address _account, bool _isActive) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setPriceFeedUpdater", _fastPriceFeed, _account, _isActive));
        _setPendingAction(action);
        emit SignalSetPriceFeedWatcher(_fastPriceFeed, _account, _isActive);
    }

    function setPriceFeedUpdater(address _fastPriceFeed, address _account, bool _isActive) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setPriceFeedUpdater", _fastPriceFeed, _account, _isActive));
        _validateAction(action);
        _clearAction(action);
        IFastPriceFeed(_fastPriceFeed).setUpdater(_account, _isActive);
    }

    function signalPriceFeedSetTokenConfig(
        address _vaultPriceFeed,
        address _token,
        address _priceFeed,
        uint256 _priceDecimals,
        bool _isStrictStable
    ) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked(
            "priceFeedSetTokenConfig",
            _vaultPriceFeed,
            _token,
            _priceFeed,
            _priceDecimals,
            _isStrictStable
        ));

        _setPendingAction(action);

        emit SignalPriceFeedSetTokenConfig(
            _vaultPriceFeed,
            _token,
            _priceFeed,
            _priceDecimals,
            _isStrictStable
        );
    }

    function priceFeedSetTokenConfig(
        address _vaultPriceFeed,
        address _token,
        address _priceFeed,
        uint256 _priceDecimals,
        bool _isStrictStable
    ) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked(
            "priceFeedSetTokenConfig",
            _vaultPriceFeed,
            _token,
            _priceFeed,
            _priceDecimals,
            _isStrictStable
        ));

        _validateAction(action);
        _clearAction(action);

        IVaultPriceFeed(_vaultPriceFeed).setTokenConfig(
            _token,
            _priceFeed,
            _priceDecimals,
            _isStrictStable
        );
    }

    function cancelAction(bytes32 _action) external onlyAdmin {
        _clearAction(_action);
    }

    function _setPendingAction(bytes32 _action) private {
        pendingActions[_action] = block.timestamp.add(buffer);
        emit SignalPendingAction(_action);
    }

    function _validateAction(bytes32 _action) private view {
        require(pendingActions[_action] != 0, "Timelock: action not signalled");
        require(pendingActions[_action] < block.timestamp, "Timelock: action time not yet passed");
    }

    function _clearAction(bytes32 _action) private {
        require(pendingActions[_action] != 0, "Timelock: invalid _action");
        delete pendingActions[_action];
        emit ClearAction(_action);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IReferralStorage {
    function codeOwners(bytes32 _code) external view returns (address);
    function traderReferralCodes(address _account) external view returns (bytes32);
    function referrerDiscountShares(address _account) external view returns (uint256);
    function referrerTiers(address _account) external view returns (uint256);
    function getTraderReferralInfo(address _account) external view returns (bytes32, address);
    function setTraderReferralCode(address _account, bytes32 _code) external;
    function setTier(uint256 _tierId, uint256 _totalRebate, uint256 _discountShare) external;
    function setReferrerTier(address _referrer, uint256 _tierId) external;
    function govSetCodeOwner(bytes32 _code, address _newAccount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IVester {
    function rewardTracker() external view returns (address);

    function claimForAccount(address _account, address _receiver) external returns (uint256);

    function claimable(address _account) external view returns (uint256);
    function cumulativeClaimAmounts(address _account) external view returns (uint256);
    function claimedAmounts(address _account) external view returns (uint256);
    function pairAmounts(address _account) external view returns (uint256);
    function getVestedAmount(address _account) external view returns (uint256);
    function transferredAverageStakedAmounts(address _account) external view returns (uint256);
    function transferredCumulativeRewards(address _account) external view returns (uint256);
    function cumulativeRewardDeductions(address _account) external view returns (uint256);
    function bonusRewards(address _account) external view returns (uint256);

    function transferStakeValues(address _sender, address _receiver) external;
    function setTransferredAverageStakedAmounts(address _account, uint256 _amount) external;
    function setTransferredCumulativeRewards(address _account, uint256 _amount) external;
    function setCumulativeRewardDeductions(address _account, uint256 _amount) external;
    function setBonusRewards(address _account, uint256 _amount) external;

    function getMaxVestableAmount(address _account) external view returns (uint256);
    function getCombinedAverageStakedAmount(address _account) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IBaseToken {
    function totalStaked() external view returns (uint256);
    function stakedBalance(address _account) external view returns (uint256);
    function removeAdmin(address _account) external;
    function setInPrivateTransferMode(bool _inPrivateTransferMode) external;
    function withdrawToken(address _token, address _account, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IMintable {
    function isMinter(address _account) external returns (bool);
    function setMinter(address _minter, bool _isActive) external;
    function mint(address _account, uint256 _amount) external;
    function burn(address _account, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IUSDG {
    function addVault(address _vault) external;
    function removeVault(address _vault) external;
    function mint(address _account, uint256 _amount) external;
    function burn(address _account, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IYieldToken {
    function totalStaked() external view returns (uint256);
    function stakedBalance(address _account) external view returns (uint256);
    function removeAdmin(address _account) external;
}