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// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
// OpenZeppelin may update its version of the ERC20PermitUpgradeable token
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-ERC20PermitUpgradeable.sol";

import "../interfaces/IPoolManager.sol";
import "../interfaces/ISanToken.sol";
import "../interfaces/IStableMaster.sol";

/// @title SanToken
/// @author Angle Core Team
/// @notice Base contract for sanTokens, these tokens are used to mark the debt the contract has to SLPs
/// @dev The exchange rate between sanTokens and collateral will automatically change as interests and transaction fees accrue to SLPs
/// @dev There is one `SanToken` contract per pair stablecoin/collateral
contract SanToken is ISanToken, ERC20PermitUpgradeable {
    /// @notice Number of decimals used for this ERC20
    uint8 public decimal;

    // ========================= References to other contracts =====================

    /// @notice Address of the corresponding `StableMaster` contract
    /// This address cannot be modified
    address public override stableMaster;

    /// @notice Address of the corresponding `PoolManager` contract
    /// This address cannot be modified
    /// Although it is not used in the functions of the contract, this address is stored in
    /// order to make sure that there cannot be a shared sanToken for multiple `PoolManager` contracts
    address public override poolManager;

    // =============================== Constructor =================================

    /// @notice Initializes the `SanToken` contract
    /// @param name_ Name of the token
    /// @param symbol_ Symbol of the token
    /// @param _poolManager Reference to the `PoolManager` contract associated to this `SanToken`
    function initialize(
        string memory name_,
        string memory symbol_,
        address _poolManager
    ) public initializer {
        __ERC20Permit_init(name_);
        __ERC20_init(name_, symbol_);

        poolManager = _poolManager;
        stableMaster = IPoolManager(poolManager).stableMaster();

        // It is possible that some ERC20 tokens do not implement this interface, in which case
        // we will have to change the constructor
        // The number of decimals of a sanToken is the number of decimals of the collateral that
        // corresponds to it
        decimal = IERC20MetadataUpgradeable(IPoolManager(poolManager).token()).decimals();
    }

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() initializer {}

    /// @notice Checks to see if it is the `StableMaster` calling this contract
    /// @dev There is no Access Control here, because it can be handled cheaply through these modifiers
    modifier onlyStableMaster() {
        require(msg.sender == stableMaster, "1");
        _;
    }

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

    /// @notice Returns the number of decimals used to get its user representation.
    /// @dev For example, if `decimals` equals `2`, a balance of `505` tokens should
    /// be displayed to a user as `5,05` (`505 / 10 ** 2`)
    /// @dev Tokens usually opt for a value of 18, imitating the relationship between
    /// Ether and Wei. This is the value {ERC20} uses, unless this function is overridden
    function decimals() public view override returns (uint8) {
        return decimal;
    }

    /// @notice Destroys `amount` token for the caller without giving collateral back
    /// @param amount Amount to burn
    function burnNoRedeem(uint256 amount) external {
        _burn(msg.sender, amount);
    }

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

    /// @notice Lets the `StableMaster` contract mint sanTokens
    /// @param account Address to mint to
    /// @param amount Amount to mint
    /// @dev Only the `StableMaster` contract can issue sanTokens
    /// @dev There is no need to make this function pausable (as well as the `StableMaster` functions below)
    /// as the corresponding function can directly be paused from the `StableMaster`
    function mint(address account, uint256 amount) external override onlyStableMaster {
        _mint(account, amount);
    }

    /// @notice Lets an address burn sanTokens
    /// @param amount Amount of sanTokens to burn from caller
    /// @dev This can only be called by the `StableMaster` which performs all the security checks
    /// to see for instance if the `burner` was the initial `msg.sender`
    function burnSelf(uint256 amount, address burner) external override onlyStableMaster {
        _burn(burner, amount);
    }

    /// @notice Lets a `sender` address burn sanTokens from another `burner` address
    /// @param burner Address to burn from and to redeem collateral to
    /// @param amount Amount of sanTokens to burn
    /// @dev Only the `StableMaster` can call this function
    function burnFrom(
        uint256 amount,
        address burner,
        address sender
    ) external override onlyStableMaster {
        uint256 currentAllowance = allowance(burner, sender);
        require(currentAllowance >= amount, "23");
        _approve(burner, sender, currentAllowance - amount);
        _burn(burner, amount);
    }
}

// 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;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal initializer {
        __Context_init_unchained();
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal initializer {
        _name = name_;
        _symbol = symbol_;
    }

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

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

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

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

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

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

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

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

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

        return true;
    }

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

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

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

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

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

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

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

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

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

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

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
    uint256[45] private __gap;
}

// 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;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./draft-IERC20PermitUpgradeable.sol";
import "../ERC20Upgradeable.sol";
import "../../../utils/cryptography/draft-EIP712Upgradeable.sol";
import "../../../utils/cryptography/ECDSAUpgradeable.sol";
import "../../../utils/CountersUpgradeable.sol";
import "../../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * _Available since v3.4._
 */
abstract contract ERC20PermitUpgradeable is Initializable, ERC20Upgradeable, IERC20PermitUpgradeable, EIP712Upgradeable {
    using CountersUpgradeable for CountersUpgradeable.Counter;

    mapping(address => CountersUpgradeable.Counter) private _nonces;

    // solhint-disable-next-line var-name-mixedcase
    bytes32 private _PERMIT_TYPEHASH;

    /**
     * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.
     *
     * It's a good idea to use the same `name` that is defined as the ERC20 token name.
     */
    function __ERC20Permit_init(string memory name) internal initializer {
        __Context_init_unchained();
        __EIP712_init_unchained(name, "1");
        __ERC20Permit_init_unchained(name);
    }

    function __ERC20Permit_init_unchained(string memory name) internal initializer {
        _PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");}

    /**
     * @dev See {IERC20Permit-permit}.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

        bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline));

        bytes32 hash = _hashTypedDataV4(structHash);

        address signer = ECDSAUpgradeable.recover(hash, v, r, s);
        require(signer == owner, "ERC20Permit: invalid signature");

        _approve(owner, spender, value);
    }

    /**
     * @dev See {IERC20Permit-nonces}.
     */
    function nonces(address owner) public view virtual override returns (uint256) {
        return _nonces[owner].current();
    }

    /**
     * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view override returns (bytes32) {
        return _domainSeparatorV4();
    }

    /**
     * @dev "Consume a nonce": return the current value and increment.
     *
     * _Available since v4.1._
     */
    function _useNonce(address owner) internal virtual returns (uint256 current) {
        CountersUpgradeable.Counter storage nonce = _nonces[owner];
        current = nonce.current();
        nonce.increment();
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library CountersUpgradeable {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSAUpgradeable {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./ECDSAUpgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712Upgradeable is Initializable {
    /* solhint-disable var-name-mixedcase */
    bytes32 private _HASHED_NAME;
    bytes32 private _HASHED_VERSION;
    bytes32 private constant _TYPE_HASH = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    function __EIP712_init(string memory name, string memory version) internal initializer {
        __EIP712_init_unchained(name, version);
    }

    function __EIP712_init_unchained(string memory name, string memory version) internal initializer {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        return _buildDomainSeparator(_TYPE_HASH, _EIP712NameHash(), _EIP712VersionHash());
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSAUpgradeable.toTypedDataHash(_domainSeparatorV4(), structHash);
    }

    /**
     * @dev The hash of the name parameter for the EIP712 domain.
     *
     * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs
     * are a concern.
     */
    function _EIP712NameHash() internal virtual view returns (bytes32) {
        return _HASHED_NAME;
    }

    /**
     * @dev The hash of the version parameter for the EIP712 domain.
     *
     * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs
     * are a concern.
     */
    function _EIP712VersionHash() internal virtual view returns (bytes32) {
        return _HASHED_VERSION;
    }
    uint256[50] private __gap;
}

// 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 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;

/// @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"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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me":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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