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// SPDX-License-Identifier: GPL-3.0

/*
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*/

pragma solidity ^0.8.12;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "../interfaces/IAngleRouterSidechain.sol";
import "../interfaces/ICoreBorrow.sol";
import "../interfaces/ISwapper.sol";
import "../interfaces/external/lido/IWStETH.sol";
import "../interfaces/external/uniswap/IUniswapRouter.sol";

// ==================================== ENUM ===================================

/// @notice All possible swaps
enum SwapType {
    UniswapV3,
    oneInch,
    AngleRouter,
    Leverage,
    None
}

/// @title Swapper
/// @author Angle Labs, Inc.
/// @notice Swapper contract facilitating interactions with Angle VaultManager contracts, notably
/// liquidation and leverage transactions
contract Swapper is ISwapper {
    using SafeERC20 for IERC20;

    // ===================== CONSTANTS AND IMMUTABLE VARIABLES =====================

    /// @notice Reference to the `CoreBorrow` contract of the module which handles all AccessControl logic
    ICoreBorrow public immutable core;
    /// @notice Uniswap Router contract
    IUniswapV3Router public immutable uniV3Router;
    /// @notice 1inch Router
    address public immutable oneInch;
    /// @notice AngleRouter
    IAngleRouterSidechain public immutable angleRouter;

    // =================================== ERRORS ==================================

    error EmptyReturnMessage();
    error IncompatibleLengths();
    error NotGovernorOrGuardian();
    error TooSmallAmountOut();
    error ZeroAddress();

    /// @notice Constructor of the contract
    /// @param _core Core address
    /// @param _uniV3Router UniswapV3 Router address
    /// @param _oneInch 1inch Router address
    /// @param _angleRouter AngleRouter contract address
    constructor(
        ICoreBorrow _core,
        IUniswapV3Router _uniV3Router,
        address _oneInch,
        IAngleRouterSidechain _angleRouter
    ) {
        if (address(_core) == address(0) || _oneInch == address(0) || address(_angleRouter) == address(0))
            revert ZeroAddress();
        core = _core;
        uniV3Router = _uniV3Router;
        oneInch = _oneInch;
        angleRouter = _angleRouter;
    }

    // ========================= EXTERNAL ACCESS FUNCTIONS =========================

    /// @inheritdoc ISwapper
    /// @dev This function swaps the `inToken` to the `outToken` by doing a UniV3 swap, a 1inch swap or by interacting
    /// with the `AngleRouter` contract
    /// @dev One slippage check is performed at the end of the call
    /// @dev In this implementation, the function tries to make sure that the `outTokenRecipient` address has at the end
    /// of the call `outTokenOwed`, leftover tokens are sent to a `to` address which by default is the `outTokenRecipient`
    function swap(
        IERC20 inToken,
        IERC20 outToken,
        address outTokenRecipient,
        uint256 outTokenOwed,
        uint256 inTokenObtained,
        bytes memory data
    ) external {
        // Address to receive the surplus amount of token at the end of the call
        address to;
        // For slippage protection, it is checked at the end of the call
        uint256 minAmountOut;
        // Type of the swap to execute: if `swapType == 4`, then it is optional to swap
        uint256 swapType;
        // We're reusing the `data` variable (it can be `path` on UniswapV3, a payload for 1inch or like encoded actions
        // for a router call)
        (to, minAmountOut, swapType, data) = abi.decode(data, (address, uint256, uint256, bytes));

        to = (to == address(0)) ? outTokenRecipient : to;

        _swap(inToken, inTokenObtained, SwapType(swapType), data);

        // A final slippage check is performed after the swaps
        uint256 outTokenBalance = outToken.balanceOf(address(this));
        if (outTokenBalance < minAmountOut) revert TooSmallAmountOut();

        // The `outTokenRecipient` may already have enough in balance, in which case there's no need to transfer
        // to this address the token and everything can be given to the `to` address
        uint256 outTokenBalanceRecipient = outToken.balanceOf(outTokenRecipient);
        if (outTokenBalanceRecipient >= outTokenOwed || to == outTokenRecipient)
            outToken.safeTransfer(to, outTokenBalance);
        else {
            // The `outTokenRecipient` should receive the delta to make sure its end balance is equal to `outTokenOwed`
            // Any leftover in this case is sent to the `to` address
            // The function reverts if it did not obtain more than `outTokenOwed - outTokenBalanceRecipient` from the swap
            outToken.safeTransfer(outTokenRecipient, outTokenOwed - outTokenBalanceRecipient);
            outToken.safeTransfer(to, outTokenBalanceRecipient + outTokenBalance - outTokenOwed);
        }
        // Reusing the `inTokenObtained` variable for the `inToken` balance
        // Sending back the remaining amount of inTokens to the `to` address: it is possible that not the full `inTokenObtained`
        // is swapped to `outToken` if we're using the `1inch` payload
        inTokenObtained = inToken.balanceOf(address(this));
        if (inTokenObtained != 0) inToken.safeTransfer(to, inTokenObtained);
    }

    // ============================ GOVERNANCE FUNCTION ============================

    /// @notice Changes allowances of this contract for different tokens
    /// @param tokens Addresses of the tokens to allow
    /// @param spenders Addresses to allow transfer
    /// @param amounts Amounts to allow
    function changeAllowance(
        IERC20[] calldata tokens,
        address[] calldata spenders,
        uint256[] calldata amounts
    ) external {
        if (!core.isGovernorOrGuardian(msg.sender)) revert NotGovernorOrGuardian();
        uint256 tokensLength = tokens.length;
        if (tokensLength != spenders.length || tokensLength != amounts.length) revert IncompatibleLengths();
        for (uint256 i; i < tokensLength; ++i) {
            _changeAllowance(tokens[i], spenders[i], amounts[i]);
        }
    }

    // ========================= INTERNAL UTILITY FUNCTIONS ========================

    /// @notice Internal version of the `_changeAllowance` function
    function _changeAllowance(
        IERC20 token,
        address spender,
        uint256 amount
    ) internal {
        uint256 currentAllowance = token.allowance(address(this), spender);
        if (currentAllowance < amount) {
            token.safeIncreaseAllowance(spender, amount - currentAllowance);
        } else if (currentAllowance > amount) {
            token.safeDecreaseAllowance(spender, currentAllowance - amount);
        }
    }

    /// @notice Checks the allowance for a contract and updates it to the max if it is not big enough
    /// @param token Token for which allowance should be checked
    /// @param spender Address to grant allowance to
    /// @param amount Minimum amount of tokens needed for the allowance
    function _checkAllowance(
        IERC20 token,
        address spender,
        uint256 amount
    ) internal {
        uint256 currentAllowance = token.allowance(address(this), spender);
        if (currentAllowance < amount) token.safeIncreaseAllowance(spender, type(uint256).max - currentAllowance);
    }

    /// @notice Performs a swap using either Uniswap, 1inch. This function can also stake stETH to wstETH
    /// @param inToken Token to swap
    /// @param amount Amount of tokens to swap
    /// @param swapType Type of the swap to perform
    /// @param args Extra args for the swap: in the case of Uniswap it should be a path, for 1inch it should be
    /// a payload
    /// @dev This function does nothing if `swapType` is None and it simply passes on the `amount` it received
    /// @dev No slippage is specified in the actions given here as a final slippage check is performed
    /// after the call to this function
    function _swap(
        IERC20 inToken,
        uint256 amount,
        SwapType swapType,
        bytes memory args
    ) internal {
        if (swapType == SwapType.UniswapV3) _swapOnUniswapV3(inToken, amount, args);
        else if (swapType == SwapType.oneInch) _swapOn1inch(inToken, args);
        else if (swapType == SwapType.AngleRouter) _angleRouterActions(inToken, args);
        else if (swapType == SwapType.Leverage) _swapLeverage(args);
    }

    /// @notice Performs a UniswapV3 swap
    /// @param inToken Token to swap
    /// @param amount Amount of tokens to swap
    /// @param path Path for the UniswapV3 swap: this encodes the out token that is going to be obtained
    /// @dev This function does not check the out token obtained here: if it is wrongly specified, either
    /// the `swap` function could fail or these tokens could stay on the contract
    function _swapOnUniswapV3(
        IERC20 inToken,
        uint256 amount,
        bytes memory path
    ) internal returns (uint256 amountOut) {
        // We need more than `amount` of allowance to the contract
        _checkAllowance(inToken, address(uniV3Router), amount);
        amountOut = uniV3Router.exactInput(ExactInputParams(path, address(this), block.timestamp, amount, 0));
    }

    /// @notice Allows to swap any token to an accepted collateral via 1inch API
    /// @param inToken Token received for the 1inch swap
    /// @param payload Bytes needed for 1inch API
    function _swapOn1inch(IERC20 inToken, bytes memory payload) internal returns (uint256 amountOut) {
        _changeAllowance(inToken, oneInch, type(uint256).max);
        //solhint-disable-next-line
        (bool success, bytes memory result) = oneInch.call(payload);
        if (!success) _revertBytes(result);
        amountOut = abi.decode(result, (uint256));
    }

    /// @notice Performs actions with the router contract of the protocol on the corresponding chain
    /// @param inToken Token concerned by the action and for which
    function _angleRouterActions(IERC20 inToken, bytes memory args) internal {
        (ActionType[] memory actions, bytes[] memory actionData) = abi.decode(args, (ActionType[], bytes[]));
        _changeAllowance(inToken, address(angleRouter), type(uint256).max);
        PermitType[] memory permits;
        angleRouter.mixer(permits, actions, actionData);
    }

    /// @notice Allows to take leverage or deleverage via a specific contract
    /// @param payload Bytes needed for 1inch API
    /// @dev This function is to be implemented if the swapper concerns a token that requires some actions
    /// not supported by 1inch or UniV3
    function _swapLeverage(bytes memory payload) internal virtual returns (uint256 amountOut) {}

    /// @notice Internal function used for error handling
    /// @param errMsg Error message received
    function _revertBytes(bytes memory errMsg) internal pure {
        if (errMsg.length != 0) {
            //solhint-disable-next-line
            assembly {
                revert(add(32, errMsg), mload(errMsg))
            }
        }
        revert EmptyReturnMessage();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

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 IERC20Permit {
    /**
     * @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
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

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

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.12;

/// @notice Action types
enum ActionType {
    transfer,
    wrap,
    wrapNative,
    sweep,
    sweepNative,
    unwrap,
    unwrapNative,
    swapIn,
    swapOut,
    uniswapV3,
    oneInch,
    claimRewards,
    gaugeDeposit,
    borrower
}

/// @notice Data needed to get permits
struct PermitType {
    address token;
    address owner;
    uint256 value;
    uint256 deadline;
    uint8 v;
    bytes32 r;
    bytes32 s;
}

/// @title IAngleRouterSidechain
/// @author Angle Labs, Inc.
/// @notice Interface for the `AngleRouter` contract on other chains
interface IAngleRouterSidechain {
    function mixer(
        PermitType[] memory paramsPermit,
        ActionType[] memory actions,
        bytes[] calldata data
    ) external;
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.12;

/// @title ICoreBorrow
/// @author Angle Labs, Inc.
/// @notice Interface for the `CoreBorrow` contract
/// @dev This interface only contains functions of the `CoreBorrow` contract which are called by other contracts
/// of this module
interface ICoreBorrow {
    /// @notice Checks if an address corresponds to a treasury of a stablecoin with a flash loan
    /// module initialized on it
    /// @param treasury Address to check
    /// @return Whether the address has the `FLASHLOANER_TREASURY_ROLE` or not
    function isFlashLoanerTreasury(address treasury) external view returns (bool);

    /// @notice Checks whether an address is governor of the Angle Protocol or not
    /// @param admin Address to check
    /// @return Whether the address has the `GOVERNOR_ROLE` or not
    function isGovernor(address admin) external view returns (bool);

    /// @notice Checks whether an address is governor or a guardian of the Angle Protocol or not
    /// @param admin Address to check
    /// @return Whether the address has the `GUARDIAN_ROLE` or not
    /// @dev Governance should make sure when adding a governor to also give this governor the guardian
    /// role by calling the `addGovernor` function
    function isGovernorOrGuardian(address admin) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.12;

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

/// @title ISwapper
/// @author Angle Labs, Inc.
/// @notice Interface for Swapper contracts
/// @dev This interface defines the key functions `Swapper` contracts should have when interacting with
/// Angle
interface ISwapper {
    /// @notice Notifies a contract that an address should be given `outToken` from `inToken`
    /// @param inToken Address of the token received
    /// @param outToken Address of the token to obtain
    /// @param outTokenRecipient Address to which the outToken should be sent
    /// @param outTokenOwed Minimum amount of outToken the `outTokenRecipient` address should have at the end of the call
    /// @param inTokenObtained Amount of collateral obtained by a related address prior
    /// to the call to this function
    /// @param data Extra data needed (to encode Uniswap swaps for instance)
    function swap(
        IERC20 inToken,
        IERC20 outToken,
        address outTokenRecipient,
        uint256 outTokenOwed,
        uint256 inTokenObtained,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.12;

/// @title IWStETH
/// @author Angle Labs, Inc.
/// @notice Interface for the `WStETH` contract
/// @dev This interface only contains functions of the `WStETH` which are called by other contracts
/// of this module
interface IWStETH {
    function wrap(uint256 _stETHAmount) external returns (uint256);

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

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.12;

struct ExactInputParams {
    bytes path;
    address recipient;
    uint256 deadline;
    uint256 amountIn;
    uint256 amountOutMinimum;
}

/// @title Router token swapping functionality
/// @notice Functions for swapping tokens via Uniswap V3
interface IUniswapV3Router {
    /// @notice Swaps `amountIn` of one token for as much as possible of another along the specified path
    /// @param params The parameters necessary for the multi-hop swap, encoded as `ExactInputParams` in calldata
    /// @return amountOut The amount of the received token
    function exactInput(ExactInputParams calldata params) external payable returns (uint256 amountOut);
}

/// @title Router for price estimation functionality
/// @notice Functions for getting the price of one token with respect to another using Uniswap V2
/// @dev This interface is only used for non critical elements of the protocol
interface IUniswapV2Router {
    /// @notice Given an input asset amount, returns the maximum output amount of the
    /// other asset (accounting for fees) given reserves.
    /// @param path Addresses of the pools used to get prices
    function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint256[] memory amounts);

    function swapExactTokensForTokens(
        uint256 swapAmount,
        uint256 minExpected,
        address[] calldata path,
        address receiver,
        uint256 swapDeadline
    ) external;
}

{
  "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

[{"inputs":[{"internalType":"contract ICoreBorrow","name":"_core","type":"address"},{"internalType":"contract IUniswapV3Router","name":"_uniV3Router","type":"address"},{"internalType":"address","name":"_oneInch","type":"address"},{"internalType":"contract IAngleRouterSidechain","name":"_angleRouter","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"EmptyReturnMessage","type":"error"},{"inputs":[],"name":"IncompatibleLengths","type":"error"},{"inputs":[],"name":"NotGovernorOrGuardian","type":"error"},{"inputs":[],"name":"TooSmallAmountOut","type":"error"},{"inputs":[],"name":"ZeroAddress","type":"error"},{"inputs":[],"name":"angleRouter","outputs":[{"internalType":"contract IAngleRouterSidechain","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20[]","name":"tokens","type":"address[]"},{"internalType":"address[]","name":"spenders","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"changeAllowance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"core","outputs":[{"internalType":"contract ICoreBorrow","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"oneInch","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"inToken","type":"address"},{"internalType":"contract IERC20","name":"outToken","type":"address"},{"internalType":"address","name":"outTokenRecipient","type":"address"},{"internalType":"uint256","name":"outTokenOwed","type":"uint256"},{"internalType":"uint256","name":"inTokenObtained","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"swap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"uniV3Router","outputs":[{"internalType":"contract IUniswapV3Router","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000005bc6bef80da563ebf6df6d6913513fa9a7ec89be000000000000000000000000e592427a0aece92de3edee1f18e0157c058615640000000000000000000000001111111254eeb25477b68fb85ed929f73a9605820000000000000000000000004579709627ca36bce92f51ac975746f431890930

-----Decoded View---------------
Arg [0] : _core (address): 0x5bc6BEf80DA563EBf6Df6D6913513fa9A7ec89BE
Arg [1] : _uniV3Router (address): 0xE592427A0AEce92De3Edee1F18E0157C05861564
Arg [2] : _oneInch (address): 0x1111111254EEB25477B68fb85Ed929f73A960582
Arg [3] : _angleRouter (address): 0x4579709627CA36BCe92f51ac975746f431890930

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000005bc6bef80da563ebf6df6d6913513fa9a7ec89be
Arg [1] : 000000000000000000000000e592427a0aece92de3edee1f18e0157c05861564
Arg [2] : 0000000000000000000000001111111254eeb25477b68fb85ed929f73a960582
Arg [3] : 0000000000000000000000004579709627ca36bce92f51ac975746f431890930