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/// Copyright (C) 2022 Portals.fi

/// @author Portals.fi
/// @notice This contract removes liquidity from Curve pools into any ERC20 token or the network token.

/// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.11;

import "../base/PortalBaseV1_1.sol";
import "./interface/ICurveAddressProvider.sol";
import "./interface/ICurvePool.sol";
import "./interface/ICurveRegistry.sol";

/// Thrown when insufficient liquidity is received after withdrawal
/// @param buyAmount The amount of tokens received
/// @param minBuyAmount The minimum acceptable quantity of buyAmount
error InsufficientBuy(uint256 buyAmount, uint256 minBuyAmount);

contract CurvePortalOut is PortalBaseV1_1 {
    using SafeTransferLib for address;
    using SafeTransferLib for ERC20;

    /// @notice Emitted when a portal is exited
    /// @param sellToken The ERC20 token address to spend (address(0) if network token)
    /// @param sellAmount The quantity of sellToken to Portal out
    /// @param buyToken The ERC20 token address to buy (address(0) if network token)
    /// @param buyAmount The quantity of buyToken received
    /// @param fee The fee in BPS
    /// @param sender The  msg.sender
    /// @param partner The front end operator address
    event PortalOut(
        address sellToken,
        uint256 sellAmount,
        address buyToken,
        uint256 buyAmount,
        uint256 fee,
        address indexed sender,
        address indexed partner
    );

    constructor(
        bytes32 protocolId,
        PortalType portalType,
        IPortalRegistry registry,
        address exchange,
        address wrappedNetworkToken,
        uint256 fee
    )
        PortalBaseV1_1(
            protocolId,
            portalType,
            registry,
            exchange,
            wrappedNetworkToken,
            fee
        )
    {}

    /// @notice Removes liquidity from Curve pools into network tokens/ERC20 tokens
    /// @param sellToken The curve pool token address
    /// @param sellAmount The quantity of sellToken to Portal out
    /// @param buyToken The ERC20 token address to buy (address(0) if network token)
    /// @param minBuyAmount The minimum quantity of buyTokens to receive. Reverts otherwise
    /// @param target The excecution target for the intermediate swap
    /// @param data  The encoded call for the intermediate swap
    /// @param partner The front end operator address
    /// @param poolData Encoded pool data including the following for the pool and metapool sequentially (if applicable):
    /// pool The address of the swap/deposit contract (address(0) for metapool set if not metapool)
    /// intermediateToken The address of the token at the index
    /// The index of the token being removed from the pool (i.e the index of intermediateToken)
    /// isInt128 A boolean value specifying whether the index is int128 or uint256
    /// removeUnderlying A boolean value specifying whether to withdraw the unwrapped version of the token
    /// @return buyAmount The quantity of buyToken acquired
    function portalOut(
        address sellToken,
        uint256 sellAmount,
        address buyToken,
        uint256 minBuyAmount,
        address target,
        bytes calldata data,
        address partner,
        bytes calldata poolData
    ) external payable pausable returns (uint256 buyAmount) {
        sellAmount = _transferFromCaller(sellToken, sellAmount);

        address intermediateToken;
        (sellAmount, intermediateToken) = _remove(
            sellToken,
            sellAmount,
            poolData
        );

        buyAmount = _execute(
            intermediateToken,
            sellAmount,
            buyToken,
            target,
            data
        );

        buyAmount = _getFeeAmount(buyAmount, fee);

        if (buyAmount < minBuyAmount)
            revert InsufficientBuy(buyAmount, minBuyAmount);

        buyToken == address(0)
            ? msg.sender.safeTransferETH(buyAmount)
            : ERC20(buyToken).safeTransfer(msg.sender, buyAmount);

        emit PortalOut(
            sellToken,
            sellAmount,
            buyToken,
            buyAmount,
            fee,
            msg.sender,
            partner
        );
    }

    /// @notice Handles removal of tokens and parsing of pooldata for pools and metapools
    /// @param sellToken The curve pool token address
    /// @param sellAmount The quantity of sellToken to Portal out
    /// @param poolData Encoded pool data including the following for the pool and metapool sequentially (if applicable):
    /// pool The address of the swap/deposit contract (address(0) for metapool set if not metapool)
    /// intermediateToken The address of the token at the index
    /// The index of the token being removed from the pool (i.e the index of intermediateToken)
    /// isInt128 A boolean value specifying whether the index is int128 or uint256
    /// removeUnderlying A boolean value specifying whether to withdraw the unwrapped version of the token
    /// @return buyAmount The quantity buyToken acquired
    /// @return intermediateToken The address of the intermediate token to swap to buyToken
    function _remove(
        address sellToken,
        uint256 sellAmount,
        bytes calldata poolData
    ) internal returns (uint256 buyAmount, address intermediateToken) {
        address pool;
        uint256 coinIndex;
        bool isInt128;
        bool removeUnderlying;

        (
            pool,
            intermediateToken,
            coinIndex,
            isInt128,
            removeUnderlying
        ) = _parsePoolData(poolData, false);

        buyAmount = _exitCurve(
            sellToken,
            sellAmount,
            pool,
            intermediateToken,
            coinIndex,
            isInt128,
            removeUnderlying
        );

        if (
            keccak256(abi.encodePacked(poolData[160:180])) !=
            keccak256(abi.encodePacked(address(0)))
        ) {
            address poolToken = intermediateToken;
            (
                pool,
                intermediateToken,
                coinIndex,
                isInt128,
                removeUnderlying
            ) = _parsePoolData(poolData, true);

            buyAmount = _exitCurve(
                poolToken,
                buyAmount,
                pool,
                intermediateToken,
                coinIndex,
                isInt128,
                removeUnderlying
            );
        }
    }

    /// @notice Removes liquidity from the pool
    /// @param sellToken The curve pool token address
    /// @param sellAmount The quantity of sellToken to Portal out
    /// @param pool The address of the swap/deposit contract (address(0) for metapool set if not metapool)
    /// @param coinIndex The index of the token being removed from the pool (i.e the index of intermediateToken)
    /// @param isInt128 A boolean value specifying whether the index is int128 or uint256
    /// @param removeUnderlying A boolean value specifying whether to withdraw the unwrapped version of the token
    /// @return buyAmount The quantity buyToken acquired
    function _exitCurve(
        address sellToken,
        uint256 sellAmount,
        address pool,
        address buyToken,
        uint256 coinIndex,
        bool isInt128,
        bool removeUnderlying
    ) internal returns (uint256) {
        _approve(sellToken, pool, sellAmount);

        uint256 balance = _getBalance(address(this), buyToken);

        ICurvePool _pool = ICurvePool(pool);

        if (isInt128) {
            if (removeUnderlying) {
                _pool.remove_liquidity_one_coin(
                    sellAmount,
                    int128(uint128(coinIndex)),
                    0,
                    true
                );
            } else {
                _pool.remove_liquidity_one_coin(
                    sellAmount,
                    int128(uint128(coinIndex)),
                    0
                );
            }
        } else {
            if (removeUnderlying) {
                _pool.remove_liquidity_one_coin(sellAmount, coinIndex, 0, true);
            } else {
                _pool.remove_liquidity_one_coin(sellAmount, coinIndex, 0);
            }
        }

        return _getBalance(address(this), buyToken) - balance;
    }

    function _parsePoolData(bytes calldata poolData, bool isMetapool)
        internal
        pure
        returns (
            address pool,
            address intermediateToken,
            uint256 coinIndex,
            bool isInt128,
            bool removeUnderlying
        )
    {
        if (isMetapool) {
            (
                ,
                ,
                ,
                ,
                ,
                pool,
                intermediateToken,
                coinIndex,
                isInt128,
                removeUnderlying
            ) = abi.decode(
                poolData,
                (
                    address,
                    address,
                    uint256,
                    bool,
                    bool,
                    address,
                    address,
                    uint256,
                    bool,
                    bool
                )
            );
        } else {
            (
                pool,
                intermediateToken,
                coinIndex,
                isInt128,
                removeUnderlying,
                ,
                ,
                ,
                ,

            ) = abi.decode(
                poolData,
                (
                    address,
                    address,
                    uint256,
                    bool,
                    bool,
                    address,
                    address,
                    uint256,
                    bool,
                    bool
                )
            );
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

/// Copyright (C) 2022 Portals.fi

/// @author Portals.fi
/// @notice Base contract inherited by Portals

/// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.11;

import "@openzeppelin/contracts/access/Ownable.sol";
import "../libraries/solmate/utils/SafeTransferLib.sol";
import "../interface/IWETH.sol";
import "../interface/IPortalFactory.sol";
import "../interface/IPortalRegistry.sol";

abstract contract PortalBaseV1_1 is Ownable {
    using SafeTransferLib for address;
    using SafeTransferLib for ERC20;

    // Active status of this contract. If false, contract is active (i.e un-paused)
    bool public paused;

    // Fee in basis points (bps)
    uint256 public fee;

    // Address of the Portal Registry
    IPortalRegistry public registry;

    // Address of the exchange used for swaps
    address public immutable exchange;

    // Address of the wrapped network token (e.g. WETH, wMATIC, wFTM, wAVAX, etc.)
    address public immutable wrappedNetworkToken;

    // Circuit breaker
    modifier pausable() {
        require(!paused, "Paused");
        _;
    }

    constructor(
        bytes32 protocolId,
        PortalType portalType,
        IPortalRegistry _registry,
        address _exchange,
        address _wrappedNetworkToken,
        uint256 _fee
    ) {
        wrappedNetworkToken = _wrappedNetworkToken;
        setFee(_fee);
        exchange = _exchange;
        registry = _registry;
        registry.addPortal(address(this), portalType, protocolId);
        transferOwnership(registry.owner());
    }

    /// @notice Transfers tokens or the network token from the caller to this contract
    /// @param token The address of the token to transfer (address(0) if network token)
    /// @param quantity The quantity of tokens to transfer from the caller
    /// @dev quantity must == msg.value when token == address(0)
    /// @dev msg.value must == 0 when token != address(0)
    /// @return The quantity of tokens or network tokens transferred from the caller to this contract
    function _transferFromCaller(address token, uint256 quantity)
        internal
        virtual
        returns (uint256)
    {
        if (token == address(0)) {
            require(
                msg.value > 0 && msg.value == quantity,
                "Invalid quantity or msg.value"
            );

            return msg.value;
        }

        require(
            quantity > 0 && msg.value == 0,
            "Invalid quantity or msg.value"
        );

        ERC20(token).safeTransferFrom(msg.sender, address(this), quantity);

        return quantity;
    }

    /// @notice Returns the quantity of tokens or network tokens after accounting for the fee
    /// @param quantity The quantity of tokens to subtract the fee from
    /// @param feeBps The fee in basis points (BPS)
    /// @return The quantity of tokens or network tokens to transact with less the fee
    function _getFeeAmount(uint256 quantity, uint256 feeBps)
        internal
        view
        returns (uint256)
    {
        return
            registry.isPortal(msg.sender)
                ? quantity
                : quantity - (quantity * feeBps) / 10000;
    }

    /// @notice Executes swap or portal data at the target address
    /// @param sellToken The sell token
    /// @param sellAmount The quantity of sellToken (in sellToken base units) to send
    /// @param buyToken The buy token
    /// @param target The execution target for the data
    /// @param data The swap or portal data
    /// @return amountBought Quantity of buyToken acquired
    function _execute(
        address sellToken,
        uint256 sellAmount,
        address buyToken,
        address target,
        bytes memory data
    ) internal virtual returns (uint256 amountBought) {
        if (sellToken == buyToken) {
            return sellAmount;
        }

        if (sellToken == address(0) && buyToken == wrappedNetworkToken) {
            IWETH(wrappedNetworkToken).deposit{ value: sellAmount }();
            return sellAmount;
        }

        if (sellToken == wrappedNetworkToken && buyToken == address(0)) {
            IWETH(wrappedNetworkToken).withdraw(sellAmount);
            return sellAmount;
        }

        uint256 valueToSend;
        if (sellToken == address(0)) {
            valueToSend = sellAmount;
        } else {
            _approve(sellToken, target, sellAmount);
        }

        uint256 initialBalance = _getBalance(address(this), buyToken);

        require(
            target == exchange || registry.isPortal(target),
            "Unauthorized target"
        );
        (bool success, bytes memory returnData) = target.call{
            value: valueToSend
        }(data);
        require(success, string(returnData));

        amountBought = _getBalance(address(this), buyToken) - initialBalance;

        require(amountBought > 0, "Invalid execution");
    }

    /// @notice Get the token or network token balance of an account
    /// @param account The owner of the tokens or network tokens whose balance is being queried
    /// @param token The address of the token (address(0) if network token)
    /// @return The owner's token or network token balance
    function _getBalance(address account, address token)
        internal
        view
        returns (uint256)
    {
        if (token == address(0)) {
            return account.balance;
        } else {
            return ERC20(token).balanceOf(account);
        }
    }

    /// @notice Approve a token for spending with finite allowance
    /// @param token The ERC20 token to approve
    /// @param spender The spender of the token
    /// @param amount The allowance to grant to the spender
    function _approve(
        address token,
        address spender,
        uint256 amount
    ) internal {
        ERC20 _token = ERC20(token);
        _token.safeApprove(spender, 0);
        _token.safeApprove(spender, amount);
    }

    /// @notice Collects tokens or network tokens from this contract
    /// @param tokens An array of the tokens to withdraw (address(0) if network token)
    function collect(address[] calldata tokens) external {
        address collector = registry.collector();

        for (uint256 i = 0; i < tokens.length; i++) {
            uint256 qty;

            if (tokens[i] == address(0)) {
                qty = address(this).balance;
                collector.safeTransferETH(qty);
            } else {
                qty = ERC20(tokens[i]).balanceOf(address(this));
                ERC20(tokens[i]).safeTransfer(collector, qty);
            }
        }
    }

    /// @dev Pause or unpause the contract
    function pause() external onlyOwner {
        paused = !paused;
    }

    /// @notice Sets the fee
    /// @param _fee The new fee amount between 0.06-1%
    function setFee(uint256 _fee) public onlyOwner {
        require(_fee >= 6 && _fee <= 100, "Invalid Fee");
        fee = _fee;
    }

    /// @notice Updates the registry
    /// @param _registry The address of the new registry
    function updateRegistry(IPortalRegistry _registry) external onlyOwner {
        registry = _registry;
    }

    /// @notice Reverts if networks tokens are sent directly to this contract
    receive() external payable {
        require(msg.sender != tx.origin);
    }
}

/// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.11;

interface ICurveAddressProvider {
    function get_registry() external view returns (address);

    function get_address(uint256 _id) external view returns (address);
}

/// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.11;

interface ICurvePool {
    function add_liquidity(uint256[2] memory _amounts, uint256 _min_mint_amount)
        external
        payable;

    function add_liquidity(
        uint256[2] memory _amounts,
        uint256 _min_mint_amount,
        bool _use_underlying
    ) external payable;

    function add_liquidity(uint256[3] memory _amounts, uint256 _min_mint_amount)
        external
        payable;

    function add_liquidity(
        uint256[3] memory _amounts,
        uint256 _min_mint_amount,
        bool _use_underlying
    ) external payable;

    function add_liquidity(uint256[4] memory _amounts, uint256 _min_mint_amount)
        external
        payable;

    function add_liquidity(
        uint256[4] memory _amounts,
        uint256 _min_mint_amount,
        bool _use_underlying
    ) external payable;

    function coins(uint256 i) external view returns (address);

    function remove_liquidity_one_coin(
        uint256 _token_amount,
        int128 i,
        uint256 min_amount
    ) external;

    function remove_liquidity_one_coin(
        uint256 token_amount,
        uint256 i,
        uint256 min_amount
    ) external;

    function remove_liquidity_one_coin(
        uint256 token_amount,
        uint256 i,
        uint256 min_amount,
        bool _use_underlying
    ) external;

    function remove_liquidity_one_coin(
        uint256 token_amount,
        int128 i,
        uint256 min_amount,
        bool _use_underlying
    ) external;
}

/// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.11;

interface ICurveRegistry {
    function get_coins(address _pool) external view returns (address[8] memory);

    function get_n_coins(address _pool) external view returns (uint256);
}

/// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.11;

import "./IPortalRegistry.sol";

interface IPortalFactory {
    function fee() external view returns (uint256 fee);

    function registry() external view returns (IPortalRegistry registry);
}

/// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.11;

enum PortalType {
    IN,
    OUT
}

interface IPortalRegistry {
    function addPortal(
        address portal,
        PortalType portalType,
        bytes32 protocolId
    ) external;

    function addPortalFactory(
        address portalFactory,
        PortalType portalType,
        bytes32 protocolId
    ) external;

    function removePortal(bytes32 protocolId, PortalType portalType) external;

    function owner() external view returns (address owner);

    function registrars(address origin) external view returns (bool isDeployer);

    function collector() external view returns (address collector);

    function isPortal(address portal) external view returns (bool isPortal);
}

/// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.11;

interface IWETH {
    function deposit() external payable;

    function withdraw(uint256 wad) external;
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 amount
    );

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount)
        public
        virtual
        returns (bool)
    {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount)
        public
        virtual
        returns (bool)
    {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max)
            allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(
                recoveredAddress != address(0) && recoveredAddress == owner,
                "INVALID_SIGNER"
            );

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return
            block.chainid == INITIAL_CHAIN_ID
                ? INITIAL_DOMAIN_SEPARATOR
                : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256(
                        "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
                    ),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import { ERC20 } from "../tokens/ERC20.sol";

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
/// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller.
library SafeTransferLib {
    event Debug(bool one, bool two, uint256 retsize);

    /*//////////////////////////////////////////////////////////////
                             ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferETH(address to, uint256 amount) internal {
        bool success;

        assembly {
            // Transfer the ETH and store if it succeeded or not.
            success := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(success, "ETH_TRANSFER_FAILED");
    }

    /*//////////////////////////////////////////////////////////////
                            ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool success;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(
                freeMemoryPointer,
                0x23b872dd00000000000000000000000000000000000000000000000000000000
            )
            mstore(add(freeMemoryPointer, 4), from) // Append the "from" argument.
            mstore(add(freeMemoryPointer, 36), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(
                    and(eq(mload(0), 1), gt(returndatasize(), 31)),
                    iszero(returndatasize())
                ),
                // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
            )
        }

        require(success, "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(
                freeMemoryPointer,
                0xa9059cbb00000000000000000000000000000000000000000000000000000000
            )
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(
                    and(eq(mload(0), 1), gt(returndatasize(), 31)),
                    iszero(returndatasize())
                ),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(
                freeMemoryPointer,
                0x095ea7b300000000000000000000000000000000000000000000000000000000
            )
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(
                    and(eq(mload(0), 1), gt(returndatasize(), 31)),
                    iszero(returndatasize())
                ),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "APPROVE_FAILED");
    }
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"bytes32","name":"protocolId","type":"bytes32"},{"internalType":"enum PortalType","name":"portalType","type":"uint8"},{"internalType":"contract IPortalRegistry","name":"registry","type":"address"},{"internalType":"address","name":"exchange","type":"address"},{"internalType":"address","name":"wrappedNetworkToken","type":"address"},{"internalType":"uint256","name":"fee","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"uint256","name":"buyAmount","type":"uint256"},{"internalType":"uint256","name":"minBuyAmount","type":"uint256"}],"name":"InsufficientBuy","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"sellToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"sellAmount","type":"uint256"},{"indexed":false,"internalType":"address","name":"buyToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"buyAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"fee","type":"uint256"},{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"address","name":"partner","type":"address"}],"name":"PortalOut","type":"event"},{"inputs":[{"internalType":"address[]","name":"tokens","type":"address[]"}],"name":"collect","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"exchange","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"sellToken","type":"address"},{"internalType":"uint256","name":"sellAmount","type":"uint256"},{"internalType":"address","name":"buyToken","type":"address"},{"internalType":"uint256","name":"minBuyAmount","type":"uint256"},{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"address","name":"partner","type":"address"},{"internalType":"bytes","name":"poolData","type":"bytes"}],"name":"portalOut","outputs":[{"internalType":"uint256","name":"buyAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"registry","outputs":[{"internalType":"contract IPortalRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_fee","type":"uint256"}],"name":"setFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IPortalRegistry","name":"_registry","type":"address"}],"name":"updateRegistry","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"wrappedNetworkToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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63757276650000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000ea49d02c248b357b99670d9e9741f54f72df9cb3000000000000000000000000def1c0ded9bec7f1a1670819833240f027b25eff000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2000000000000000000000000000000000000000000000000000000000000001e

-----Decoded View---------------
Arg [0] : protocolId (bytes32): 0x6375727665000000000000000000000000000000000000000000000000000000
Arg [1] : portalType (uint8): 1
Arg [2] : registry (address): 0xEa49D02c248b357B99670d9E9741F54f72dF9Cb3
Arg [3] : exchange (address): 0xDef1C0ded9bec7F1a1670819833240f027b25EfF
Arg [4] : wrappedNetworkToken (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [5] : fee (uint256): 30

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 6375727665000000000000000000000000000000000000000000000000000000
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [2] : 000000000000000000000000ea49d02c248b357b99670d9e9741f54f72df9cb3
Arg [3] : 000000000000000000000000def1c0ded9bec7f1a1670819833240f027b25eff
Arg [4] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [5] : 000000000000000000000000000000000000000000000000000000000000001e