Contract

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "./FeeManagerStorage.sol";

/// @title FeeManager
/// @author Angle Core Team
/// @dev This contract interacts with fee parameters for a given stablecoin/collateral pair
/// @dev `FeeManager` contains all the functions that keepers can call to update parameters
/// in the `StableMaster` and `PerpetualManager` contracts
/// @dev These parameters need to be updated by keepers because they depend on variables, like
/// the collateral ratio, that are too expensive to compute each time transactions that would need
/// it occur
contract FeeManager is FeeManagerStorage, IFeeManagerFunctions, AccessControl, Initializable {
    /// @notice Role for `PoolManager` only
    bytes32 public constant POOLMANAGER_ROLE = keccak256("POOLMANAGER_ROLE");
    /// @notice Role for guardians and governors
    bytes32 public constant GUARDIAN_ROLE = keccak256("GUARDIAN_ROLE");

    /// @notice Deploys the `FeeManager` contract for a pair stablecoin/collateral
    /// @param _poolManager `PoolManager` contract handling the collateral
    /// @dev The `_poolManager` address is used to grant the correct role. It does not need to be stored by the
    /// contract
    /// @dev There is no need to do a zero address check on the `_poolManager` as if the zero address is passed
    /// the function will revert when trying to fetch the `StableMaster`
    constructor(IPoolManager _poolManager) {
        stableMaster = IStableMaster(_poolManager.stableMaster());
        // Once a `FeeManager` contract has been initialized with a `PoolManager` contract, this
        // reference cannot be modified
        _setupRole(POOLMANAGER_ROLE, address(_poolManager));

        _setRoleAdmin(POOLMANAGER_ROLE, POOLMANAGER_ROLE);
        _setRoleAdmin(GUARDIAN_ROLE, POOLMANAGER_ROLE);
    }

    /// @notice Initializes the governor and guardian roles of the contract as well as the reference to
    /// the `perpetualManager` contract
    /// @param governorList List of the governor addresses of the protocol
    /// @param guardian Guardian address of the protocol
    /// @param _perpetualManager `PerpetualManager` contract handling the perpetuals of the pool
    /// @dev `GUARDIAN_ROLE` can then directly be granted or revoked by the corresponding `PoolManager`
    /// As `POOLMANAGER_ROLE` is admin of `GUARDIAN_ROLE`, it corresponds to the intended behaviour of roles
    function deployCollateral(
        address[] memory governorList,
        address guardian,
        address _perpetualManager
    ) external override onlyRole(POOLMANAGER_ROLE) initializer {
        for (uint256 i = 0; i < governorList.length; i++) {
            _grantRole(GUARDIAN_ROLE, governorList[i]);
        }
        _grantRole(GUARDIAN_ROLE, guardian);
        perpetualManager = IPerpetualManager(_perpetualManager);
    }

    // ============================ `StableMaster` =================================

    /// @notice Updates the SLP and Users fees associated to the pair stablecoin/collateral in
    /// the `StableMaster` contract
    /// @dev This function updates:
    /// 	-	`bonusMalusMint`: part of the fee induced by a user minting depending on the collateral ratio
    ///                   In normal times, no fees are taken for that, and so this fee should be equal to `BASE_PARAMS`
    ///		-	`bonusMalusBurn`: part of the fee induced by a user burning depending on the collateral ratio
    ///		-	Slippage: what's given to SLPs compared with their claim when they exit
    ///		-	SlippageFee: that is the portion of fees that is put aside because the protocol
    ///         is not well collateralized
    /// @dev `bonusMalusMint` and `bonusMalusBurn` allow governance to add penalties or bonuses for users minting
    /// and burning in some situations of collateral ratio. These parameters are multiplied to the fee amount depending
    /// on the hedge ratio by Hedging Agents to get the exact fee induced to the users
    function updateUsersSLP() external override {
        // Computing the collateral ratio, expressed in `BASE_PARAMS`
        uint256 collatRatio = stableMaster.getCollateralRatio();
        // Computing the fees based on this collateral ratio
        uint64 bonusMalusMint = _piecewiseLinearCollatRatio(collatRatio, xBonusMalusMint, yBonusMalusMint);
        uint64 bonusMalusBurn = _piecewiseLinearCollatRatio(collatRatio, xBonusMalusBurn, yBonusMalusBurn);
        uint64 slippage = _piecewiseLinearCollatRatio(collatRatio, xSlippage, ySlippage);
        uint64 slippageFee = _piecewiseLinearCollatRatio(collatRatio, xSlippageFee, ySlippageFee);

        emit UserAndSLPFeesUpdated(collatRatio, bonusMalusMint, bonusMalusBurn, slippage, slippageFee);
        stableMaster.setFeeKeeper(bonusMalusMint, bonusMalusBurn, slippage, slippageFee);
    }

    // ============================= PerpetualManager ==============================

    /// @notice Updates HA fees associated to the pair stablecoin/collateral in the `PerpetualManager` contract
    /// @dev This function updates:
    ///     - The part of the fee taken from HAs when they open a perpetual or add collateral in it. This allows
    ///        governance to add penalties or bonuses in some occasions to HAs opening their perpetuals
    ///     - The part of the fee taken from the HA when they withdraw collateral from a perpetual. This allows
    ///       governance to add penalty or bonuses in some occasions to HAs closing their perpetuals
    /// @dev Penalties or bonuses for HAs should almost never be used
    /// @dev In the `PerpetualManager` contract, these parameters are multiplied to the fee amount depending on the HA
    /// hedge ratio to get the exact fee amount for HAs
    /// @dev For the moment, these parameters do not depend on the collateral ratio, and they are just an extra
    /// element that governance can play on to correct fees taken for HAs
    function updateHA() external override {
        emit HaFeesUpdated(haFeeDeposit, haFeeWithdraw);
        perpetualManager.setFeeKeeper(haFeeDeposit, haFeeWithdraw);
    }

    // ============================= Governance ====================================

    /// @notice Sets the x (i.e. thresholds of collateral ratio) array / y (i.e. value of fees at threshold)-array
    /// for users minting, burning, for SLPs withdrawal slippage or for the slippage fee when updating
    /// the exchange rate between sanTokens and collateral
    /// @param xArray New collateral ratio thresholds (in ascending order)
    /// @param yArray New fees or values for the parameters at thresholds
    /// @param typeChange Type of parameter to change
    /// @dev For `typeChange = 1`, `bonusMalusMint` fees are updated
    /// @dev For `typeChange = 2`, `bonusMalusBurn` fees are updated
    /// @dev For `typeChange = 3`, `slippage` values are updated
    /// @dev For other values of `typeChange`, `slippageFee` values are updated
    function setFees(
        uint256[] memory xArray,
        uint64[] memory yArray,
        uint8 typeChange
    ) external override onlyRole(GUARDIAN_ROLE) {
        require(xArray.length == yArray.length && yArray.length > 0, "5");
        for (uint256 i = 0; i <= yArray.length - 1; i++) {
            if (i > 0) {
                require(xArray[i] > xArray[i - 1], "7");
            }
        }
        if (typeChange == 1) {
            xBonusMalusMint = xArray;
            yBonusMalusMint = yArray;
            emit FeeMintUpdated(xBonusMalusMint, yBonusMalusMint);
        } else if (typeChange == 2) {
            xBonusMalusBurn = xArray;
            yBonusMalusBurn = yArray;
            emit FeeBurnUpdated(xBonusMalusBurn, yBonusMalusBurn);
        } else if (typeChange == 3) {
            xSlippage = xArray;
            ySlippage = yArray;
            _checkSlippageCompatibility();
            emit SlippageUpdated(xSlippage, ySlippage);
        } else {
            xSlippageFee = xArray;
            ySlippageFee = yArray;
            _checkSlippageCompatibility();
            emit SlippageFeeUpdated(xSlippageFee, ySlippageFee);
        }
    }

    /// @notice Sets the extra fees that can be used when HAs deposit or withdraw collateral from the
    /// protocol
    /// @param _haFeeDeposit New parameter to modify deposit fee for HAs
    /// @param _haFeeWithdraw New parameter to modify withdraw fee for HAs
    function setHAFees(uint64 _haFeeDeposit, uint64 _haFeeWithdraw) external override onlyRole(GUARDIAN_ROLE) {
        haFeeDeposit = _haFeeDeposit;
        haFeeWithdraw = _haFeeWithdraw;
    }

    /// @notice Helps to make sure that the `slippageFee` and the `slippage` will in most situations be compatible
    /// with one another
    /// @dev Whenever the `slippageFee` is not null, the `slippage` should be non null, as otherwise, there would be
    /// an opportunity cost to increase the collateral ratio to make the `slippage` non null and collect the fees
    /// that have been left aside
    /// @dev This function does not perform an exhaustive check around the fact that whenever the `slippageFee`
    /// is not null the `slippage` is not null neither. It simply checks that each positive value in the `ySlippageFee` array
    /// corresponds to a positive value of the `slippage`
    /// @dev The protocol still relies on governance to make sure that this condition is always verified, this function
    /// is just here to eliminate potentially extreme errors
    function _checkSlippageCompatibility() internal view {
        // We need this `if` condition because when this function is first called after contract deployment, the length
        // of the two arrays is zero
        if (xSlippage.length >= 1 && xSlippageFee.length >= 1) {
            for (uint256 i = 0; i <= ySlippageFee.length - 1; i++) {
                if (ySlippageFee[i] > 0) {
                    require(ySlippageFee[i] <= BASE_PARAMS_CASTED, "37");
                    require(_piecewiseLinearCollatRatio(xSlippageFee[i], xSlippage, ySlippage) > 0, "38");
                }
            }
        }
    }

    /// @notice Computes the value of a linear by part function at a given point
    /// @param x Point of the function we want to compute
    /// @param xArray List of breaking points (in ascending order) that define the linear by part function
    /// @param yArray List of values at breaking points (not necessarily in ascending order)
    /// @dev The evolution of the linear by part function between two breaking points is linear
    /// @dev Before the first breaking point and after the last one, the function is constant with a value
    /// equal to the first or last value of the `yArray`
    /// @dev The reason for having a function that is different from what's in the `FunctionUtils` contract is that
    /// here the values in `xArray` can be greater than `BASE_PARAMS` meaning that there is a non negligeable risk that
    /// the product between `yArray` and `xArray` values overflows
    function _piecewiseLinearCollatRatio(
        uint256 x,
        uint256[] storage xArray,
        uint64[] storage yArray
    ) internal view returns (uint64 y) {
        if (x >= xArray[xArray.length - 1]) {
            return yArray[xArray.length - 1];
        } else if (x <= xArray[0]) {
            return yArray[0];
        } else {
            uint256 lower;
            uint256 upper = xArray.length - 1;
            uint256 mid;
            while (upper - lower > 1) {
                mid = lower + (upper - lower) / 2;
                if (xArray[mid] <= x) {
                    lower = mid;
                } else {
                    upper = mid;
                }
            }
            uint256 yCasted;
            if (yArray[upper] > yArray[lower]) {
                yCasted =
                    yArray[lower] +
                    ((yArray[upper] - yArray[lower]) * (x - xArray[lower])) /
                    (xArray[upper] - xArray[lower]);
            } else {
                yCasted =
                    yArray[lower] -
                    ((yArray[lower] - yArray[upper]) * (x - xArray[lower])) /
                    (xArray[upper] - xArray[lower]);
            }
            // There is no problem with this cast as `y` was initially a `uint64` and we divided a `uint256` with a `uint256`
            // that is greater
            y = uint64(yCasted);
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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 ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/Strings.sol";

import "../interfaces/IAccessControl.sol";

/**
 * @dev This contract is fully forked from OpenZeppelin `AccessControl`.
 * The only difference is the removal of the ERC165 implementation as it's not
 * needed in Angle.
 *
 * Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{20}) is missing role (0x[0-9a-f]{32})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{20}) is missing role (0x[0-9a-f]{32})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external override {
        require(account == _msgSender(), "71");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal {
        emit RoleAdminChanged(role, getRoleAdmin(role), adminRole);
        _roles[role].adminRole = adminRole;
    }

    function _grantRole(bytes32 role, address account) internal {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) internal {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";

import "../external/AccessControl.sol";

import "../interfaces/IFeeManager.sol";
import "../interfaces/IPoolManager.sol";
import "../interfaces/IStableMaster.sol";
import "../interfaces/IPerpetualManager.sol";

/// @title FeeManagerEvents
/// @author Angle Core Team
/// @dev This file contains all the events that are triggered by the `FeeManager` contract
contract FeeManagerEvents {
    event UserAndSLPFeesUpdated(
        uint256 _collatRatio,
        uint64 _bonusMalusMint,
        uint64 _bonusMalusBurn,
        uint64 _slippage,
        uint64 _slippageFee
    );

    event FeeMintUpdated(uint256[] _xBonusMalusMint, uint64[] _yBonusMalusMint);

    event FeeBurnUpdated(uint256[] _xBonusMalusBurn, uint64[] _yBonusMalusBurn);

    event SlippageUpdated(uint256[] _xSlippage, uint64[] _ySlippage);

    event SlippageFeeUpdated(uint256[] _xSlippageFee, uint64[] _ySlippageFee);

    event HaFeesUpdated(uint64 _haFeeDeposit, uint64 _haFeeWithdraw);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "./FeeManagerEvents.sol";

/// @title FeeManagerStorage
/// @author Angle Core Team
/// @dev `FeeManagerStorage` contains all the parameters (most often fee parameters) to add corrections
/// to fees in the `StableMaster` and `PerpetualManager` contracts
contract FeeManagerStorage is FeeManagerEvents {
    uint64 public constant BASE_PARAMS_CASTED = 10**9;
    // ==================== References to other contracts ==========================

    /// @notice Address of the `StableMaster` contract corresponding to this contract
    /// This reference cannot be modified
    IStableMaster public stableMaster;

    /// @notice Address of the `PerpetualManager` corresponding to this contract
    /// This reference cannot be modified
    IPerpetualManager public perpetualManager;

    // ================= Parameters that can be set by governance ==================

    /// @notice Bonus - Malus Fee, means that if the `fee > BASE_PARAMS` then agents incur a malus and will
    /// have larger fees, while `fee < BASE_PARAMS` they incur a smaller fee than what they would have if fees
    /// just consisted in what was obtained using the hedge ratio
    /// @notice Values of the collateral ratio where mint transaction fees will change for users
    /// It should be ranked in ascending order
    uint256[] public xBonusMalusMint;
    /// @notice Values of the bonus/malus on the mint fees at the points of collateral ratio in the array above
    /// The evolution of the fees when collateral ratio is between two threshold values is linear
    uint64[] public yBonusMalusMint;
    /// @notice Values of the collateral ratio where burn transaction fees will change
    uint256[] public xBonusMalusBurn;
    /// @notice Values of the bonus/malus on the burn fees at the points of collateral ratio in the array above
    uint64[] public yBonusMalusBurn;

    /// @notice Values of the collateral ratio where the slippage factor for SLPs exiting will evolve
    uint256[] public xSlippage;
    /// @notice Slippage factor at the values of collateral ratio above
    uint64[] public ySlippage;
    /// @notice Values of the collateral ratio where the slippage fee, that is the portion of the fees
    /// that does not come to SLPs although changes
    uint256[] public xSlippageFee;
    /// @notice Slippage fee value at the values of collateral ratio above
    uint64[] public ySlippageFee;

    /// @notice Bonus - Malus HA deposit Fee, means that if the `fee > BASE_PARAMS` then HAs incur a malus and
    /// will have larger fees, while `fee < BASE_PARAMS` they incur a smaller fee than what they would have if
    /// fees just consisted in what was obtained using hedge ratio
    uint64 public haFeeDeposit;
    /// @notice Bonus - Malus HA withdraw Fee
    uint64 public haFeeWithdraw;
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

/// @title IAccessControl
/// @author Forked from OpenZeppelin
/// @notice Interface for `AccessControl` contracts
interface IAccessControl {
    function hasRole(bytes32 role, address account) external view returns (bool);

    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    function grantRole(bytes32 role, address account) external;

    function revokeRole(bytes32 role, address account) external;

    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

interface IERC721 is IERC165 {
    function balanceOf(address owner) external view returns (uint256 balance);

    function ownerOf(uint256 tokenId) external view returns (address owner);

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    function approve(address to, uint256 tokenId) external;

    function getApproved(uint256 tokenId) external view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) external;

    function isApprovedForAll(address owner, address operator) external view returns (bool);

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

interface IERC721Metadata is IERC721 {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "./IAccessControl.sol";

/// @title IFeeManagerFunctions
/// @author Angle Core Team
/// @dev Interface for the `FeeManager` contract
interface IFeeManagerFunctions is IAccessControl {
    // ================================= Keepers ===================================

    function updateUsersSLP() external;

    function updateHA() external;

    // ================================= Governance ================================

    function deployCollateral(
        address[] memory governorList,
        address guardian,
        address _perpetualManager
    ) external;

    function setFees(
        uint256[] memory xArray,
        uint64[] memory yArray,
        uint8 typeChange
    ) external;

    function setHAFees(uint64 _haFeeDeposit, uint64 _haFeeWithdraw) external;
}

/// @title IFeeManager
/// @author Angle Core Team
/// @notice Previous interface with additionnal getters for public variables and mappings
/// @dev We need these getters as they are used in other contracts of the protocol
interface IFeeManager is IFeeManagerFunctions {
    function stableMaster() external view returns (address);

    function perpetualManager() external view returns (address);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

/// @title IOracle
/// @author Angle Core Team
/// @notice Interface for Angle's oracle contracts reading oracle rates from both UniswapV3 and Chainlink
/// from just UniswapV3 or from just Chainlink
interface IOracle {
    function read() external view returns (uint256);

    function readAll() external view returns (uint256 lowerRate, uint256 upperRate);

    function readLower() external view returns (uint256);

    function readUpper() external view returns (uint256);

    function readQuote(uint256 baseAmount) external view returns (uint256);

    function readQuoteLower(uint256 baseAmount) external view returns (uint256);

    function inBase() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "./IERC721.sol";
import "./IFeeManager.sol";
import "./IOracle.sol";
import "./IAccessControl.sol";

/// @title Interface of the contract managing perpetuals
/// @author Angle Core Team
/// @dev Front interface, meaning only user-facing functions
interface IPerpetualManagerFront is IERC721Metadata {
    function openPerpetual(
        address owner,
        uint256 amountBrought,
        uint256 amountCommitted,
        uint256 maxOracleRate,
        uint256 minNetMargin
    ) external returns (uint256 perpetualID);

    function closePerpetual(
        uint256 perpetualID,
        address to,
        uint256 minCashOutAmount
    ) external;

    function addToPerpetual(uint256 perpetualID, uint256 amount) external;

    function removeFromPerpetual(
        uint256 perpetualID,
        uint256 amount,
        address to
    ) external;

    function liquidatePerpetuals(uint256[] memory perpetualIDs) external;

    function forceClosePerpetuals(uint256[] memory perpetualIDs) external;

    // ========================= External View Functions =============================

    function getCashOutAmount(uint256 perpetualID, uint256 rate) external view returns (uint256, uint256);

    function isApprovedOrOwner(address spender, uint256 perpetualID) external view returns (bool);
}

/// @title Interface of the contract managing perpetuals
/// @author Angle Core Team
/// @dev This interface does not contain user facing functions, it just has functions that are
/// interacted with in other parts of the protocol
interface IPerpetualManagerFunctions is IAccessControl {
    // ================================= Governance ================================

    function deployCollateral(
        address[] memory governorList,
        address guardian,
        IFeeManager feeManager,
        IOracle oracle_
    ) external;

    function setFeeManager(IFeeManager feeManager_) external;

    function setHAFees(
        uint64[] memory _xHAFees,
        uint64[] memory _yHAFees,
        uint8 deposit
    ) external;

    function setTargetAndLimitHAHedge(uint64 _targetHAHedge, uint64 _limitHAHedge) external;

    function setKeeperFeesLiquidationRatio(uint64 _keeperFeesLiquidationRatio) external;

    function setKeeperFeesCap(uint256 _keeperFeesLiquidationCap, uint256 _keeperFeesClosingCap) external;

    function setKeeperFeesClosing(uint64[] memory _xKeeperFeesClosing, uint64[] memory _yKeeperFeesClosing) external;

    function setLockTime(uint64 _lockTime) external;

    function setBoundsPerpetual(uint64 _maxLeverage, uint64 _maintenanceMargin) external;

    function pause() external;

    function unpause() external;

    // ==================================== Keepers ================================

    function setFeeKeeper(uint64 feeDeposit, uint64 feesWithdraw) external;

    // =============================== StableMaster ================================

    function setOracle(IOracle _oracle) external;
}

/// @title IPerpetualManager
/// @author Angle Core Team
/// @notice Previous interface with additionnal getters for public variables
interface IPerpetualManager is IPerpetualManagerFunctions {
    function poolManager() external view returns (address);

    function oracle() external view returns (address);

    function targetHAHedge() external view returns (uint64);

    function totalHedgeAmount() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "./IFeeManager.sol";
import "./IPerpetualManager.sol";
import "./IOracle.sol";

// Struct for the parameters associated to a strategy interacting with a collateral `PoolManager`
// contract
struct StrategyParams {
    // Timestamp of last report made by this strategy
    // It is also used to check if a strategy has been initialized
    uint256 lastReport;
    // Total amount the strategy is expected to have
    uint256 totalStrategyDebt;
    // The share of the total assets in the `PoolManager` contract that the `strategy` can access to.
    uint256 debtRatio;
}

/// @title IPoolManagerFunctions
/// @author Angle Core Team
/// @notice Interface for the collateral poolManager contracts handling each one type of collateral for
/// a given stablecoin
/// @dev Only the functions used in other contracts of the protocol are left here
interface IPoolManagerFunctions {
    // ============================ Constructor ====================================

    function deployCollateral(
        address[] memory governorList,
        address guardian,
        IPerpetualManager _perpetualManager,
        IFeeManager feeManager,
        IOracle oracle
    ) external;

    // ============================ Yield Farming ==================================

    function creditAvailable() external view returns (uint256);

    function debtOutstanding() external view returns (uint256);

    function report(
        uint256 _gain,
        uint256 _loss,
        uint256 _debtPayment
    ) external;

    // ============================ Governance =====================================

    function addGovernor(address _governor) external;

    function removeGovernor(address _governor) external;

    function setGuardian(address _guardian, address guardian) external;

    function revokeGuardian(address guardian) external;

    function setFeeManager(IFeeManager _feeManager) external;

    // ============================= Getters =======================================

    function getBalance() external view returns (uint256);

    function getTotalAsset() external view returns (uint256);
}

/// @title IPoolManager
/// @author Angle Core Team
/// @notice Previous interface with additionnal getters for public variables and mappings
/// @dev Used in other contracts of the protocol
interface IPoolManager is IPoolManagerFunctions {
    function stableMaster() external view returns (address);

    function perpetualManager() external view returns (address);

    function token() external view returns (address);

    function feeManager() external view returns (address);

    function totalDebt() external view returns (uint256);

    function strategies(address _strategy) external view returns (StrategyParams memory);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";

/// @title ISanToken
/// @author Angle Core Team
/// @notice Interface for Angle's `SanToken` contract that handles sanTokens, tokens that are given to SLPs
/// contributing to a collateral for a given stablecoin
interface ISanToken is IERC20Upgradeable {
    // ================================== StableMaster =============================

    function mint(address account, uint256 amount) external;

    function burnFrom(
        uint256 amount,
        address burner,
        address sender
    ) external;

    function burnSelf(uint256 amount, address burner) external;

    function stableMaster() external view returns (address);

    function poolManager() external view returns (address);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

// Normally just importing `IPoolManager` should be sufficient, but for clarity here
// we prefer to import all concerned interfaces
import "./IPoolManager.sol";
import "./IOracle.sol";
import "./IPerpetualManager.sol";
import "./ISanToken.sol";

// Struct to handle all the parameters to manage the fees
// related to a given collateral pool (associated to the stablecoin)
struct MintBurnData {
    // Values of the thresholds to compute the minting fees
    // depending on HA hedge (scaled by `BASE_PARAMS`)
    uint64[] xFeeMint;
    // Values of the fees at thresholds (scaled by `BASE_PARAMS`)
    uint64[] yFeeMint;
    // Values of the thresholds to compute the burning fees
    // depending on HA hedge (scaled by `BASE_PARAMS`)
    uint64[] xFeeBurn;
    // Values of the fees at thresholds (scaled by `BASE_PARAMS`)
    uint64[] yFeeBurn;
    // Max proportion of collateral from users that can be covered by HAs
    // It is exactly the same as the parameter of the same name in `PerpetualManager`, whenever one is updated
    // the other changes accordingly
    uint64 targetHAHedge;
    // Minting fees correction set by the `FeeManager` contract: they are going to be multiplied
    // to the value of the fees computed using the hedge curve
    // Scaled by `BASE_PARAMS`
    uint64 bonusMalusMint;
    // Burning fees correction set by the `FeeManager` contract: they are going to be multiplied
    // to the value of the fees computed using the hedge curve
    // Scaled by `BASE_PARAMS`
    uint64 bonusMalusBurn;
    // Parameter used to limit the number of stablecoins that can be issued using the concerned collateral
    uint256 capOnStableMinted;
}

// Struct to handle all the variables and parameters to handle SLPs in the protocol
// including the fraction of interests they receive or the fees to be distributed to
// them
struct SLPData {
    // Last timestamp at which the `sanRate` has been updated for SLPs
    uint256 lastBlockUpdated;
    // Fees accumulated from previous blocks and to be distributed to SLPs
    uint256 lockedInterests;
    // Max interests used to update the `sanRate` in a single block
    // Should be in collateral token base
    uint256 maxInterestsDistributed;
    // Amount of fees left aside for SLPs and that will be distributed
    // when the protocol is collateralized back again
    uint256 feesAside;
    // Part of the fees normally going to SLPs that is left aside
    // before the protocol is collateralized back again (depends on collateral ratio)
    // Updated by keepers and scaled by `BASE_PARAMS`
    uint64 slippageFee;
    // Portion of the fees from users minting and burning
    // that goes to SLPs (the rest goes to surplus)
    uint64 feesForSLPs;
    // Slippage factor that's applied to SLPs exiting (depends on collateral ratio)
    // If `slippage = BASE_PARAMS`, SLPs can get nothing, if `slippage = 0` they get their full claim
    // Updated by keepers and scaled by `BASE_PARAMS`
    uint64 slippage;
    // Portion of the interests from lending
    // that goes to SLPs (the rest goes to surplus)
    uint64 interestsForSLPs;
}

/// @title IStableMasterFunctions
/// @author Angle Core Team
/// @notice Interface for the `StableMaster` contract
interface IStableMasterFunctions {
    function deploy(
        address[] memory _governorList,
        address _guardian,
        address _agToken
    ) external;

    // ============================== Lending ======================================

    function accumulateInterest(uint256 gain) external;

    function signalLoss(uint256 loss) external;

    // ============================== HAs ==========================================

    function getStocksUsers() external view returns (uint256 maxCAmountInStable);

    function convertToSLP(uint256 amount, address user) external;

    // ============================== Keepers ======================================

    function getCollateralRatio() external returns (uint256);

    function setFeeKeeper(
        uint64 feeMint,
        uint64 feeBurn,
        uint64 _slippage,
        uint64 _slippageFee
    ) external;

    // ============================== AgToken ======================================

    function updateStocksUsers(uint256 amount, address poolManager) external;

    // ============================= Governance ====================================

    function setCore(address newCore) external;

    function addGovernor(address _governor) external;

    function removeGovernor(address _governor) external;

    function setGuardian(address newGuardian, address oldGuardian) external;

    function revokeGuardian(address oldGuardian) external;

    function setCapOnStableAndMaxInterests(
        uint256 _capOnStableMinted,
        uint256 _maxInterestsDistributed,
        IPoolManager poolManager
    ) external;

    function setIncentivesForSLPs(
        uint64 _feesForSLPs,
        uint64 _interestsForSLPs,
        IPoolManager poolManager
    ) external;

    function setUserFees(
        IPoolManager poolManager,
        uint64[] memory _xFee,
        uint64[] memory _yFee,
        uint8 _mint
    ) external;

    function setTargetHAHedge(uint64 _targetHAHedge) external;

    function pause(bytes32 agent, IPoolManager poolManager) external;

    function unpause(bytes32 agent, IPoolManager poolManager) external;
}

/// @title IStableMaster
/// @author Angle Core Team
/// @notice Previous interface with additionnal getters for public variables and mappings
interface IStableMaster is IStableMasterFunctions {
    function agToken() external view returns (address);

    function collateralMap(IPoolManager poolManager)
        external
        view
        returns (
            IERC20 token,
            ISanToken sanToken,
            IPerpetualManager perpetualManager,
            IOracle oracle,
            uint256 stocksUsers,
            uint256 sanRate,
            uint256 collatBase,
            SLPData memory slpData,
            MintBurnData memory feeData
        );
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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IPerpetualManager","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"xArray","type":"uint256[]"},{"internalType":"uint64[]","name":"yArray","type":"uint64[]"},{"internalType":"uint8","name":"typeChange","type":"uint8"}],"name":"setFees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint64","name":"_haFeeDeposit","type":"uint64"},{"internalType":"uint64","name":"_haFeeWithdraw","type":"uint64"}],"name":"setHAFees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stableMaster","outputs":[{"internalType":"contract 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000000000000000000000000c9daabc677f3d1301006e723bd21c60be57a5915

-----Decoded View---------------
Arg [0] : _poolManager (address): 0xc9daabC677F3d1301006e723bD21C60be57a5915

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000c9daabc677f3d1301006e723bd21c60be57a5915