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//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.3;

import "./ZkSyncBridgeSwapper.sol";
import "./interfaces/IZkSync.sol";
import "./interfaces/IWstETH.sol";
import "./interfaces/ILido.sol";
import "./interfaces/ICurvePool.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/**
* Exchanges between ETH and wStETH
* index 0: ETH
* index 1: wStETH
*/
contract LidoBridgeSwapper is ZkSyncBridgeSwapper {

    // The address of the stEth token
    address public immutable stEth;
    // The address of the wrapped stEth token
    address public immutable wStEth;
    // The address of the stEth/Eth Curve pool
    address public immutable stEthPool;
    // The referral address for Lido
    address public immutable lidoReferral;

    constructor(
        address _zkSync,
        address _l2Account,
        address _wStEth,
        address _stEthPool,
        address _lidoReferral
    )
        ZkSyncBridgeSwapper(_zkSync, _l2Account)
    {
        wStEth = _wStEth;
        address _stEth = IWstETH(_wStEth).stETH();
        require(_stEth == ICurvePool(_stEthPool).coins(1), "stEth mismatch");
        stEth = _stEth;
        stEthPool = _stEthPool;
        lidoReferral = _lidoReferral;
    }

    function exchange(
        uint256 _indexIn,
        uint256 _indexOut,
        uint256 _amountIn,
        uint256 _minAmountOut
    ) 
        onlyOwner
        external 
        override 
        returns (uint256 amountOut) 
    {
        require(_indexIn + _indexOut == 1, "invalid indexes");

        if (_indexIn == 0) {
            transferFromZkSync(ETH_TOKEN);
            amountOut = swapEthForWstEth(_amountIn);
            require(amountOut >= _minAmountOut, "slippage");
            transferToZkSync(wStEth, amountOut);
            emit Swapped(ETH_TOKEN, _amountIn, wStEth, amountOut);
        } else {
            transferFromZkSync(wStEth);
            amountOut = swapWstEthForEth(_amountIn);
            require(amountOut >= _minAmountOut, "slippage");
            transferToZkSync(ETH_TOKEN, amountOut);
            emit Swapped(wStEth, _amountIn, ETH_TOKEN, amountOut);
        }
    }

    /**
    * @dev Swaps ETH for wrapped stETH and deposits the resulting wstETH to the ZkSync bridge.
    * First withdraws ETH from the bridge if there is a pending balance.
    * @param _amountIn The amount of ETH to swap.
    */
    function swapEthForWstEth(uint256 _amountIn) internal returns (uint256) {
        uint256 dy = ICurvePool(stEthPool).get_dy(0, 1, _amountIn);
        uint256 stEthAmount;

        // if stETH below parity on Curve get it there, otherwise stake on Lido contract
        if (dy > _amountIn) {
            stEthAmount = ICurvePool(stEthPool).exchange{value: _amountIn}(0, 1, _amountIn, 1);
        } else {
            ILido(stEth).submit{value: _amountIn}(lidoReferral);
            stEthAmount = _amountIn;
        }

        // approve the wStEth contract to take the stEth
        IERC20(stEth).approve(wStEth, stEthAmount);
        // wrap to wStEth and return deposited amount
        return IWstETH(wStEth).wrap(stEthAmount);
    }

    /**
    * @dev Swaps wrapped stETH for ETH and deposits the resulting ETH to the ZkSync bridge.
    * First withdraws wrapped stETH from the bridge if there is a pending balance.
    * @param _amountIn The amount of wrapped stETH to swap.
    */
    function swapWstEthForEth(uint256 _amountIn) internal returns (uint256) {
        // unwrap to stEth
        uint256 unwrapped = IWstETH(wStEth).unwrap(_amountIn);
        // approve pool
        bool success = IERC20(stEth).approve(stEthPool, unwrapped);
        require(success, "approve failed");
        // swap stEth for ETH on Curve and return deposited amount
        return ICurvePool(stEthPool).exchange(1, 0, unwrapped, 1);
    }
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.3;

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

abstract contract ZkSyncBridgeSwapper is IBridgeSwapper {

    // The owner of the contract
    address public owner;

    // The ZkSync bridge contract
    address public immutable zkSync;
    // The L2 market maker account
    address public immutable l2Account;

    address constant internal ETH_TOKEN = address(0);

    event OwnerChanged(address _owner, address _newOwner);
    event SlippageChanged(uint256 _slippagePercent);

    modifier onlyOwner {
        require(msg.sender == owner, "unauthorised");
        _;
    }

    constructor(address _zkSync, address _l2Account) {
        zkSync = _zkSync;
        l2Account = _l2Account;
        owner = msg.sender;
    }

    function changeOwner(address _newOwner) external onlyOwner {
        require(_newOwner != address(0), "invalid input");
        owner = _newOwner;
        emit OwnerChanged(owner, _newOwner);
    }

    /**
    * @dev Check if there is a pending balance to withdraw in zkSync and withdraw it if applicable.
    * @param _token The token to withdraw.
    */
    function transferFromZkSync(address _token) internal {
        uint128 pendingBalance = IZkSync(zkSync).getPendingBalance(address(this), _token);
        if (pendingBalance > 0) {
            IZkSync(zkSync).withdrawPendingBalance(payable(address(this)), _token, pendingBalance);
        }
    }

    /**
    * @dev Deposit the ETH or ERC20 token to zkSync.
    * @param _outputToken The token that was given.
    * @param _amountOut The amount of given token.
    */
    function transferToZkSync(address _outputToken, uint256 _amountOut) internal {
        if (_outputToken == ETH_TOKEN) {
            // deposit Eth to L2 bridge
            IZkSync(zkSync).depositETH{value: _amountOut}(l2Account);
        } else {
            // approve the zkSync bridge to take the output token
            IERC20(_outputToken).approve(zkSync, _amountOut);
            // deposit the output token to the L2 bridge
            IZkSync(zkSync).depositERC20(IERC20(_outputToken), toUint104(_amountOut), l2Account);
        }
    }

    /**
    * @dev Safety method to recover ETH or ERC20 tokens that are sent to the contract by error.
    * @param _token The token to recover.
    */
    function recoverToken(address _recipient, address _token) external onlyOwner returns (uint256 balance) {
        bool success;
        if (_token == ETH_TOKEN) {
            balance = address(this).balance;
            (success, ) = _recipient.call{value: balance}("");
        } else {
            balance = IERC20(_token).balanceOf(address(this));
            success = IERC20(_token).transfer(_recipient, balance);
        }
        require(success, "failed to recover");
    }

    /**
     * @dev fallback method to make sure we can receive ETH
     */
    receive() external payable {
        
    }

    /**
     * @dev Returns the downcasted uint104 from uint256, reverting on
     * overflow (when the input is greater than largest uint104).
     */
    function toUint104(uint256 value) internal pure returns (uint104) {
        require(value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits");
        return uint104(value);
    }
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.3;

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

interface IZkSync {
    function getPendingBalance(address _address, address _token) external view returns (uint128);
    function withdrawPendingBalance(address payable _owner, address _token, uint128 _amount) external;
    function depositETH(address _zkSyncAddress) external payable;
    function depositERC20(IERC20 _token, uint104 _amount, address _zkSyncAddress) external;
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.3;

interface IWstETH {
    function stETH() external returns (address);
    function wrap(uint256 _stETHAmount) external returns (uint256);
    function unwrap(uint256 _wstETHAmount) external returns (uint256);
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.3;

interface ILido {
    function submit(address _referral) external payable returns (uint256);
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.3;

interface ICurvePool {
    function coins(uint256 _i) external view returns (address);
    function lp_token() external view returns (address);
    function get_virtual_price() external view returns (uint256);
    function get_dy(int128 _i, int128 _j, uint256 _dx) external view returns (uint256);

    function exchange(int128 _i, int128 _j, uint256 _dx, uint256 _minDy) external payable returns (uint256);
    function add_liquidity(uint256[2] calldata _amounts, uint256 _minMintAmount) external payable returns (uint256);
    function remove_liquidity_one_coin(uint256 _amount, int128 _i, uint256 _minAmount) external payable returns (uint256);
    function calc_token_amount(uint256[2] calldata _amounts, bool _isDeposit) external view returns (uint256);
    function calc_withdraw_one_coin(uint256 _amount, int128 _i) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC20/IERC20.sol)

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: Unlicense
pragma solidity ^0.8.3;

interface IBridgeSwapper {
    event Swapped(address _inputToken, uint256 _amountIn, address _outputToken, uint256 _amountOut);

    /**
    * @notice Perform an exchange between two tokens
    * @dev Index values can usually be found via the constructor arguments (if not hardcoded)
    * @param _indexIn Index value for the token to send
    * @param _indexOut Index valie of the token to receive
    * @param _amountIn Amount of `_indexIn` being exchanged
    * @return Actual amount of `_indexOut` received
    */
    function exchange(uint256 _indexIn, uint256 _indexOut, uint256 _amountIn, uint256 _minAmountOut) external returns (uint256);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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000000000000000000000000abea9132b05a70803a4e85094fd0e1800777fbef0000000000000000000000004d4c6545c17396bdfb7c635ca5c5361d00335aa20000000000000000000000007f39c581f595b53c5cb19bd0b3f8da6c935e2ca0000000000000000000000000dc24316b9ae028f1497c275eb9192a3ea0f67022000000000000000000000000ef8e1b4b676a5285db79d55d3288bc5fe65c71cc

-----Decoded View---------------
Arg [0] : _zkSync (address): 0xaBEA9132b05A70803a4E85094fD0e1800777fBEF
Arg [1] : _l2Account (address): 0x4D4c6545C17396bDFB7c635Ca5C5361D00335aa2
Arg [2] : _wStEth (address): 0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0
Arg [3] : _stEthPool (address): 0xDC24316b9AE028F1497c275EB9192a3Ea0f67022
Arg [4] : _lidoReferral (address): 0xef8e1b4b676A5285db79d55d3288bC5FE65C71cc

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000abea9132b05a70803a4e85094fd0e1800777fbef
Arg [1] : 0000000000000000000000004d4c6545c17396bdfb7c635ca5c5361d00335aa2
Arg [2] : 0000000000000000000000007f39c581f595b53c5cb19bd0b3f8da6c935e2ca0
Arg [3] : 000000000000000000000000dc24316b9ae028f1497c275eb9192a3ea0f67022
Arg [4] : 000000000000000000000000ef8e1b4b676a5285db79d55d3288bc5fe65c71cc