Contract

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "./CoreEvents.sol";

/// @title Core
/// @author Angle Core Team
/// @notice Keeps track of all the `StableMaster` contracts and facilitates governance by allowing the propagation
/// of changes across most contracts of the protocol (does not include oracle contract, `RewardsDistributor`, and some
/// other side contracts like `BondingCurve` or `CollateralSettler`)
contract Core is CoreEvents, ICore {
    /// @notice Map to track the addresses with a `GOVERNOR_ROLE` within Angle protocol
    mapping(address => bool) public governorMap;

    /// @notice Map to track the addresses of the `stableMaster` contracts that have already been deployed
    /// This is used to avoid deploying a revoked `stableMaster` contract again and hence potentially creating
    /// inconsistencies in the `GOVERNOR_ROLE` and `GUARDIAN_ROLE` of this `stableMaster`
    mapping(address => bool) public deployedStableMasterMap;

    /// @notice Address of the guardian, it can be revoked by Angle's governance
    /// The protocol has only one guardian address
    address public override guardian;

    /// @notice List of the addresses of the `StableMaster` contracts accepted by the system
    address[] internal _stablecoinList;

    // List of all the governor addresses of Angle's protocol
    // Initially only the timelock will be appointed governor but new addresses can be added along the way
    address[] internal _governorList;

    /// @notice Checks to see if the caller is a `governor`
    /// The reason for having such modifiers rather than OpenZeppelin's Access Control logic is to make
    /// sure that governors cannot bypass the `addGovernor` or `revokeGovernor` functions
    modifier onlyGovernor() {
        require(governorMap[msg.sender], "1");
        _;
    }

    /// @notice Checks to see if the caller is a `guardian` or a `governor`
    /// Same here, we do not use OpenZeppelin's Access Control logic to make sure that the `guardian`
    /// cannot bypass the functions defined on purpose in this contract
    modifier onlyGuardian() {
        require(governorMap[msg.sender] || msg.sender == guardian, "1");
        _;
    }

    /// @notice Checks if the new address given is not null
    /// @param newAddress Address to check
    modifier zeroCheck(address newAddress) {
        require(newAddress != address(0), "0");
        _;
    }

    // =============================== CONSTRUCTOR =================================

    /// @notice Initializes the `Core` contract
    /// @param _governor Address of the governor
    /// @param _guardian Address of the guardian
    constructor(address _governor, address _guardian) {
        // Creating references
        require(_guardian != address(0) && _governor != address(0), "0");
        require(_guardian != _governor, "39");
        _governorList.push(_governor);
        guardian = _guardian;
        governorMap[_governor] = true;

        emit GovernorRoleGranted(_governor);
        emit GuardianRoleChanged(address(0), _guardian);
    }

    // ========================= GOVERNOR FUNCTIONS ================================

    // ======================== Interactions with `StableMasters` ==================

    /// @notice Changes the `Core` contract of the protocol
    /// @param newCore Address of the new `Core` contract
    /// @dev To maintain consistency, checks are performed. The governance of the new `Core`
    /// contract should be exactly the same as this one, and the `_stablecoinList` should be
    /// identical
    function setCore(ICore newCore) external onlyGovernor zeroCheck(address(newCore)) {
        require(address(this) != address(newCore), "40");
        require(guardian == newCore.guardian(), "41");
        // The length of the lists are stored as cache variables to avoid duplicate reads in storage
        // Checking the consistency of the `_governorList` and of the `_stablecoinList`
        uint256 governorListLength = _governorList.length;
        address[] memory _newCoreGovernorList = newCore.governorList();
        uint256 stablecoinListLength = _stablecoinList.length;
        address[] memory _newStablecoinList = newCore.stablecoinList();
        require(
            governorListLength == _newCoreGovernorList.length && stablecoinListLength == _newStablecoinList.length,
            "42"
        );
        uint256 indexMet;
        for (uint256 i = 0; i < governorListLength; i++) {
            if (!governorMap[_newCoreGovernorList[i]]) {
                indexMet = 1;
                break;
            }
        }
        for (uint256 i = 0; i < stablecoinListLength; i++) {
            // The stablecoin lists should preserve exactly the same order of elements
            if (_stablecoinList[i] != _newStablecoinList[i]) {
                indexMet = 1;
                break;
            }
        }
        // Only performing one require, hence making it cheaper for a governance with a correct initialization
        require(indexMet == 0, "43");
        // Propagates the change
        for (uint256 i = 0; i < stablecoinListLength; i++) {
            IStableMaster(_stablecoinList[i]).setCore(address(newCore));
        }
        emit CoreChanged(address(newCore));
    }

    /// @notice Adds a new stablecoin to the system
    /// @param agToken Address of the new `AgToken` contract
    /// @dev To maintain consistency, the address of the `StableMaster` contract corresponding to the
    /// `AgToken` is automatically retrieved
    /// @dev The `StableMaster` receives the reference to the governor and guardian addresses of the protocol
    /// @dev The `AgToken` and `StableMaster` contracts should have previously been initialized with correct references
    /// in it, with for the `StableMaster` a reference to the `Core` contract and for the `AgToken` a reference to the
    /// `StableMaster`
    function deployStableMaster(address agToken) external onlyGovernor zeroCheck(agToken) {
        address stableMaster = IAgToken(agToken).stableMaster();
        // Checking if `stableMaster` has not already been deployed
        require(!deployedStableMasterMap[stableMaster], "44");

        // Storing and initializing information about the stablecoin
        _stablecoinList.push(stableMaster);
        // Adding this `stableMaster` in the `deployedStableMasterMap`: it is not going to be possible
        // to revoke and then redeploy this contract
        deployedStableMasterMap[stableMaster] = true;

        IStableMaster(stableMaster).deploy(_governorList, guardian, agToken);

        emit StableMasterDeployed(address(stableMaster), agToken);
    }

    /// @notice Revokes a `StableMaster` contract
    /// @param stableMaster Address of  the `StableMaster` to revoke
    /// @dev This function just removes a `StableMaster` contract from the `_stablecoinList`
    /// @dev The consequence is that the `StableMaster` contract will no longer be affected by changes in
    /// governor or guardian occuring from the protocol
    /// @dev This function is mostly here to clean the mappings and save some storage space
    function revokeStableMaster(address stableMaster) external override onlyGovernor {
        uint256 stablecoinListLength = _stablecoinList.length;
        // Checking if `stableMaster` is correct and removing the stablecoin from the `_stablecoinList`
        require(stablecoinListLength >= 1, "45");
        uint256 indexMet;
        for (uint256 i = 0; i < stablecoinListLength - 1; i++) {
            if (_stablecoinList[i] == stableMaster) {
                indexMet = 1;
                _stablecoinList[i] = _stablecoinList[stablecoinListLength - 1];
                break;
            }
        }
        require(indexMet == 1 || _stablecoinList[stablecoinListLength - 1] == stableMaster, "45");
        _stablecoinList.pop();
        // Deleting the stablecoin from the list
        emit StableMasterRevoked(stableMaster);
    }

    // =============================== Access Control ==============================
    // The following functions do not propagate the changes they induce to some bricks of the protocol
    // like the `CollateralSettler`, the `BondingCurve`, the staking and rewards distribution contracts
    // and the oracle contracts using Uniswap. Governance should be wary when calling these functions and
    // make equivalent changes in these contracts to maintain consistency at the scale of the protocol

    /// @notice Adds a new governor address
    /// @param _governor New governor address
    /// @dev This function propagates the new governor role across most contracts of the protocol
    /// @dev Governor is also guardian everywhere in all contracts
    function addGovernor(address _governor) external override onlyGovernor zeroCheck(_governor) {
        require(!governorMap[_governor], "46");
        governorMap[_governor] = true;
        _governorList.push(_governor);
        // Propagates the changes to maintain consistency across all the contracts that are attached to this
        // `Core` contract
        for (uint256 i = 0; i < _stablecoinList.length; i++) {
            // Since a zero address check has already been performed in this contract, there is no need
            // to repeat this check in underlying contracts
            IStableMaster(_stablecoinList[i]).addGovernor(_governor);
        }

        emit GovernorRoleGranted(_governor);
    }

    /// @notice Removes a governor address
    /// @param _governor Governor address to remove
    /// @dev There must always be one governor in the protocol
    function removeGovernor(address _governor) external override onlyGovernor {
        // Checking if removing the governor will leave with at least more than one governor
        uint256 governorListLength = _governorList.length;
        require(governorListLength > 1, "47");
        // Removing the governor from the list of governors
        // We still need to check if the address provided was well in the list
        uint256 indexMet;
        for (uint256 i = 0; i < governorListLength - 1; i++) {
            if (_governorList[i] == _governor) {
                indexMet = 1;
                _governorList[i] = _governorList[governorListLength - 1];
                break;
            }
        }
        require(indexMet == 1 || _governorList[governorListLength - 1] == _governor, "48");
        _governorList.pop();
        // Once it has been checked that the given address was a correct address, we can proceed to other changes
        delete governorMap[_governor];
        // Maintaining consistency across all contracts
        for (uint256 i = 0; i < _stablecoinList.length; i++) {
            // We have checked in this contract that the mentionned `_governor` here was well a governor
            // There is no need to check this in the underlying contracts where this is going to be updated
            IStableMaster(_stablecoinList[i]).removeGovernor(_governor);
        }

        emit GovernorRoleRevoked(_governor);
    }

    // ============================== GUARDIAN FUNCTIONS ===========================

    /// @notice Changes the guardian address
    /// @param _newGuardian New guardian address
    /// @dev Guardian is able to change by itself the address corresponding to its role
    /// @dev There can only be one guardian address in the protocol
    /// @dev The guardian address cannot be a governor address
    function setGuardian(address _newGuardian) external override onlyGuardian zeroCheck(_newGuardian) {
        require(!governorMap[_newGuardian], "39");
        require(guardian != _newGuardian, "49");
        address oldGuardian = guardian;
        guardian = _newGuardian;
        for (uint256 i = 0; i < _stablecoinList.length; i++) {
            IStableMaster(_stablecoinList[i]).setGuardian(_newGuardian, oldGuardian);
        }
        emit GuardianRoleChanged(oldGuardian, _newGuardian);
    }

    /// @notice Revokes the guardian address
    /// @dev Guardian is able to auto-revoke itself
    /// @dev There can only be one `guardian` address in the protocol
    function revokeGuardian() external override onlyGuardian {
        address oldGuardian = guardian;
        guardian = address(0);
        for (uint256 i = 0; i < _stablecoinList.length; i++) {
            IStableMaster(_stablecoinList[i]).revokeGuardian(oldGuardian);
        }
        emit GuardianRoleChanged(oldGuardian, address(0));
    }

    // ========================= VIEW FUNCTIONS ====================================

    /// @notice Returns the list of all the governor addresses of the protocol
    /// @return `_governorList`
    /// @dev This getter is used by `StableMaster` contracts deploying new collateral types
    /// and initializing them with correct references
    function governorList() external view override returns (address[] memory) {
        return _governorList;
    }

    /// @notice Returns the list of all the `StableMaster` addresses of the protocol
    /// @return `_stablecoinList`
    /// @dev This getter is used by the `Core` contract when setting a new `Core`
    function stablecoinList() external view override returns (address[] memory) {
        return _stablecoinList;
    }
}

// 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: GPL-3.0

pragma solidity ^0.8.7;

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

import "../interfaces/ICore.sol";
import "../interfaces/IAgToken.sol";
import "../interfaces/IStableMaster.sol";

/// @title CoreEvents
/// @author Angle Core Team
/// @notice All the events used in the `Core` contract
contract CoreEvents {
    event StableMasterDeployed(address indexed _stableMaster, address indexed _agToken);

    event StableMasterRevoked(address indexed _stableMaster);

    event GovernorRoleGranted(address indexed governor);

    event GovernorRoleRevoked(address indexed governor);

    event GuardianRoleChanged(address indexed oldGuardian, address indexed newGuardian);

    event CoreChanged(address indexed newCore);
}

// 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;

/// @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-upgradeable/token/ERC20/IERC20Upgradeable.sol";

/// @title IAgToken
/// @author Angle Core Team
/// @notice Interface for the stablecoins `AgToken` contracts
/// @dev The only functions that are left in the interface are the functions which are used
/// at another point in the protocol by a different contract
interface IAgToken is IERC20Upgradeable {
    // ======================= `StableMaster` functions ============================
    function mint(address account, uint256 amount) external;

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

    function burnSelf(uint256 amount, address burner) external;

    // ========================= External function =================================

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

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "./IStableMaster.sol";

/// @title ICore
/// @author Angle Core Team
/// @dev Interface for the functions of the `Core` contract
interface ICore {
    function revokeStableMaster(address stableMaster) external;

    function addGovernor(address _governor) external;

    function removeGovernor(address _governor) external;

    function setGuardian(address _guardian) external;

    function revokeGuardian() external;

    function governorList() external view returns (address[] memory);

    function stablecoinList() external view returns (address[] memory);

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

// 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"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000fda462548ce04282f4b6d6619823a7c64fdc01850000000000000000000000000c2553e4b9dfa9f83b1a6d3eab96c4baab42d430

-----Decoded View---------------
Arg [0] : _governor (address): 0xfdA462548Ce04282f4B6D6619823a7C64Fdc0185
Arg [1] : _guardian (address): 0x0C2553e4B9dFA9f83b1A6D3EAB96c4bAaB42d430

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000fda462548ce04282f4b6d6619823a7c64fdc0185
Arg [1] : 0000000000000000000000000c2553e4b9dfa9f83b1a6d3eab96c4baab42d430