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// Copyright (C) 2018  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

import "./common/BaseFeature.sol";
import "../../lib/other/ERC20.sol";
import "../../lib/paraswap/IAugustusSwapper.sol";
import "../infrastructure/ITokenPriceRegistry.sol";
import "../infrastructure/IDexRegistry.sol";

/**
 * @title TokenExchanger
 * @notice Module to trade tokens (ETH or ERC20) using ParaSwap.
 * @author Olivier VDB - <[email protected]>
 */
contract TokenExchanger is BaseFeature {

    bytes32 constant NAME = "TokenExchanger";

    using SafeMath for uint256;

    // Mock token address for ETH
    address constant internal ETH_TOKEN_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    // Signatures of Paraswap's trade methods
    // solhint-disable-next-line max-line-length
    bytes4 constant internal MULTISWAP = 0xcbd1603e; // bytes4(keccak256("multiSwap(address,address,uint256,uint256,uint256,(address,uint256,(address,address,uint256,bytes,uint256)[])[],uint256,address,uint256,string)"))
    // solhint-disable-next-line max-line-length
    bytes4 constant internal BUY = 0xbb2a349b; // bytes4(keccak256("buy(address,address,uint256,uint256,uint256,(address,address,uint256,uint256,bytes,uint256)[],uint256,address,uint256,string)"))

    // The address of the Paraswap Proxy contract
    address public paraswapProxy;
    // The address of the Paraswap contract
    address public paraswapSwapper;
    // The label of the referrer
    string public referrer;
    // Registry of authorised exchanges
    IDexRegistry public dexRegistry;
    // The token price registry
    ITokenPriceRegistry public tokenPriceRegistry;

    event TokenExchanged(address indexed wallet, address srcToken, uint srcAmount, address destToken, uint destAmount);


    // *************** Constructor ********************** //

    constructor(
        ILockStorage _lockStorage,
        ITokenPriceRegistry _tokenPriceRegistry,
        IVersionManager _versionManager,
        IDexRegistry _dexRegistry,
        address _paraswap,
        string memory _referrer
    )
        BaseFeature(_lockStorage, _versionManager, NAME)
        public
    {
        tokenPriceRegistry = _tokenPriceRegistry;
        dexRegistry = _dexRegistry;
        paraswapSwapper = _paraswap;
        paraswapProxy = IAugustusSwapper(_paraswap).getTokenTransferProxy();
        referrer = _referrer;
    }

    /**
     * @inheritdoc IFeature
     */
    function getRequiredSignatures(address, bytes calldata) external view override returns (uint256, OwnerSignature) {
        return (1, OwnerSignature.Required);
    }

    /**
     * @notice Lets the owner of the wallet execute a "sell" trade (fixed source amount, variable destination amount).
     * @param _wallet The target wallet
     * @param _srcToken The address of the source token.
     * @param _destToken The address of the destination token.
     * @param _srcAmount The exact amount of source tokens to sell.
     * @param _minDestAmount The minimum amount of destination tokens required for the trade.
     * @param _expectedDestAmount The expected amount of destination tokens (used only in ParaSwap's Swapped event).
     * @param _path Sequence of sets of weighted ParaSwap routes. Each route specifies an exchange to use to convert a given (exact) amount of
     * a given source token into a given (minimum) amount of a given destination token. The path is a sequence of sets of weighted routes where
     * the destination token of a set of weighted routes matches the source token of the next set of weighted routes in the path.
     * @param _mintPrice gasPrice (in wei) at the time the gas tokens were minted by ParaSwap. 0 means gas token will not be used by ParaSwap
     */
    function sell(
        address _wallet,
        address _srcToken,
        address _destToken,
        uint256 _srcAmount,
        uint256 _minDestAmount,
        uint256 _expectedDestAmount,
        IAugustusSwapper.Path[] calldata _path,
        uint256 _mintPrice
    )
        external
        onlyWalletOwnerOrFeature(_wallet)
        onlyWhenUnlocked(_wallet)
    {
        // Verify that the destination token is tradable
        verifyTradable(_destToken);
        // Verify that the exchange adapters used have been authorised
        verifyExchangeAdapters(_path);
        // Approve source amount if required
        uint previousAllowance = approveToken(_wallet, _srcToken, _srcAmount);
        // Perform trade and emit event
        doSell(
            _wallet,
            _srcToken,
            _destToken,
            _srcAmount,
            _minDestAmount,
            _expectedDestAmount,
            _path,
            _mintPrice);
        // Restore the previous allowance if needed. This should only be needed when the previous allowance
        // was infinite. In other cases, paraswap.multiSwap() should have used exactly the additional allowance
        // granted to it and therefore the previous allowance should have been restored.
        restoreAllowance(_wallet, _srcToken, previousAllowance);
    }

    /**
     * @notice Lets the owner of the wallet execute a "buy" trade (fixed destination amount, variable source amount).
     * @param _wallet The target wallet
     * @param _srcToken The address of the source token.
     * @param _destToken The address of the destination token.
     * @param _maxSrcAmount The maximum amount of source tokens to use for the trade.
     * @param _destAmount The exact amount of destination tokens to buy.
     * @param _expectedSrcAmount The expected amount of source tokens (used only in ParaSwap's Bought event).
     * @param _routes Set of weighted ParaSwap routes. Each route specifies an exchange to use to convert a given (maximum) amount of a given
     * source token into a given (exact) amount of a given destination token.
     * @param _mintPrice gasPrice (in wei) at the time the gas tokens were minted by ParaSwap. 0 means gas token will not be used by ParaSwap
     */
    function buy(
        address _wallet,
        address _srcToken,
        address _destToken,
        uint256 _maxSrcAmount,
        uint256 _destAmount,
        uint256 _expectedSrcAmount,
        IAugustusSwapper.BuyRoute[] calldata _routes,
        uint256 _mintPrice
    )
        external
        onlyWalletOwnerOrFeature(_wallet)
        onlyWhenUnlocked(_wallet)
    {
        // Verify that the destination token is tradable
        verifyTradable(_destToken);
        // Verify that the exchange adapters used have been authorised
        verifyExchangeAdapters(_routes);
        // Approve source amount if required
        uint previousAllowance = approveToken(_wallet, _srcToken, _maxSrcAmount);
        // Perform trade and emit event
        doBuy(
            _wallet,
            _srcToken,
            _destToken,
            _maxSrcAmount,
            _destAmount,
            _expectedSrcAmount,
            _routes,
            _mintPrice);
        // Restore the previous allowance if needed (paraswap.buy() may not have used exactly the additional allowance granted to it)
        restoreAllowance(_wallet, _srcToken, previousAllowance);
    }

    // Internal & Private Methods

    function verifyTradable(address _token) internal view {
        require((_token == ETH_TOKEN_ADDRESS) || tokenPriceRegistry.isTokenTradable(_token), "TE: Token not tradable");
    }

    function verifyExchangeAdapters(IAugustusSwapper.Path[] calldata _path) internal view {
        dexRegistry.verifyExchangeAdapters(_path);
    }

    function verifyExchangeAdapters(IAugustusSwapper.BuyRoute[] calldata _routes) internal view {
        dexRegistry.verifyExchangeAdapters(_routes);
    }

    function approveToken(address _wallet, address _token, uint _amount) internal returns (uint256 _existingAllowance) {
        // TODO: Use a "safe approve" logic similar to the one implemented below in other modules
        if (_token != ETH_TOKEN_ADDRESS) {
            _existingAllowance = ERC20(_token).allowance(_wallet, paraswapProxy);
            if (_existingAllowance < uint256(-1)) {
                if (_existingAllowance > 0) {
                    // Clear the existing allowance to avoid issues with tokens like USDT that do not allow changing a non-zero allowance
                    invokeWallet(_wallet, _token, 0, abi.encodeWithSignature("approve(address,uint256)", paraswapProxy, 0));
                }
                // Increase the allowance to include the required amount
                uint256 newAllowance = SafeMath.add(_existingAllowance, _amount);
                invokeWallet(
                    _wallet,
                    _token,
                    0,
                    abi.encodeWithSignature("approve(address,uint256)", paraswapProxy, newAllowance)
                );
            }
        }
    }

    function restoreAllowance(address _wallet, address _token, uint _previousAllowance) internal {
        if (_token != ETH_TOKEN_ADDRESS) {
            uint allowance = ERC20(_token).allowance(_wallet, paraswapProxy);
            if (allowance != _previousAllowance) {
                invokeWallet(
                    _wallet,
                    _token,
                    0,
                    abi.encodeWithSignature("approve(address,uint256)", paraswapProxy, _previousAllowance)
                );
            }
        }
    }

    function doTradeAndEmitEvent(
        address _wallet,
        address _srcToken,
        address _destToken,
        uint256 _srcAmount,
        uint256 _destAmount,
        bytes memory tradeData
    )
        internal
    {
        // Perform the trade
        bytes memory swapRes = invokeWallet(
            _wallet,
            paraswapSwapper,
            _srcToken == ETH_TOKEN_ADDRESS ? _srcAmount : 0, tradeData
        );

        // Emit event with best possible estimate of destination amount
        uint256 estimatedDestAmount;
        if (swapRes.length > 0) {
            (estimatedDestAmount) = abi.decode(swapRes, (uint256));
        } else {
            estimatedDestAmount = _destAmount;
        }
        emit TokenExchanged(_wallet, _srcToken, _srcAmount, _destToken, estimatedDestAmount);
    }

    function doSell(
        address _wallet,
        address _srcToken,
        address _destToken,
        uint256 _srcAmount,
        uint256 _minDestAmount,
        uint256 _expectedDestAmount,
        IAugustusSwapper.Path[] calldata _path,
        uint256 _mintPrice
    )
        internal
    {
        // Build the calldata
        string memory ref = referrer;
        bytes memory tradeData = abi.encodeWithSelector(MULTISWAP,
            _srcToken, _destToken, _srcAmount, _minDestAmount, _expectedDestAmount, _path, _mintPrice, address(0), 0, ref);

        // Perform the trade
        doTradeAndEmitEvent(_wallet, _srcToken, _destToken, _srcAmount, _minDestAmount, tradeData);
    }

    function doBuy(
        address _wallet,
        address _srcToken,
        address _destToken,
        uint256 _maxSrcAmount,
        uint256 _destAmount,
        uint256 _expectedSrcAmount,
        IAugustusSwapper.BuyRoute[] calldata _routes,
        uint256 _mintPrice
    )
        internal
    {
        // Build the calldata
        string memory ref = referrer;
        bytes memory tradeData = abi.encodeWithSelector(BUY,
            _srcToken, _destToken, _maxSrcAmount, _destAmount, _expectedSrcAmount, _routes, _mintPrice, address(0), 0, ref);

        // Perform the trade
        doTradeAndEmitEvent(_wallet, _srcToken, _destToken, _maxSrcAmount, _destAmount, tradeData);
    }

}

// Copyright (C) 2020  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

import "../../lib/paraswap/IAugustusSwapper.sol";

/**
 * @title IDexRegistry
 * @notice Interface for DexRegistry.
 * @author Olivier VDB - <[email protected]>
 */
interface IDexRegistry {
    function verifyExchangeAdapters(IAugustusSwapper.Path[] calldata _path) external view;
    function verifyExchangeAdapters(IAugustusSwapper.BuyRoute[] calldata _routes) external view;
}

// Copyright (C) 2020  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.5.4 <0.7.0;

/**
 * @title IModuleRegistry
 * @notice Interface for the registry of authorised modules.
 */
interface IModuleRegistry {
    function registerModule(address _module, bytes32 _name) external;

    function deregisterModule(address _module) external;

    function registerUpgrader(address _upgrader, bytes32 _name) external;

    function deregisterUpgrader(address _upgrader) external;

    function recoverToken(address _token) external;

    function moduleInfo(address _module) external view returns (bytes32);

    function upgraderInfo(address _upgrader) external view returns (bytes32);

    function isRegisteredModule(address _module) external view returns (bool);

    function isRegisteredModule(address[] calldata _modules) external view returns (bool);

    function isRegisteredUpgrader(address _upgrader) external view returns (bool);
}

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.6.12;

/**
 * @title ITokenPriceRegistry
 * @notice TokenPriceRegistry interface
 */
interface ITokenPriceRegistry {
    function getTokenPrice(address _token) external view returns (uint184 _price);
    function isTokenTradable(address _token) external view returns (bool _isTradable);
}

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

/**
 * @title ILimitStorage
 * @notice LimitStorage interface
 */
interface ILimitStorage {

    struct Limit {
        // the current limit
        uint128 current;
        // the pending limit if any
        uint128 pending;
        // when the pending limit becomes the current limit
        uint64 changeAfter;
    }

    struct DailySpent {
        // The amount already spent during the current period
        uint128 alreadySpent;
        // The end of the current period
        uint64 periodEnd;
    }

    function setLimit(address _wallet, Limit memory _limit) external;

    function getLimit(address _wallet) external view returns (Limit memory _limit);

    function setDailySpent(address _wallet, DailySpent memory _dailySpent) external;

    function getDailySpent(address _wallet) external view returns (DailySpent memory _dailySpent);

    function setLimitAndDailySpent(address _wallet, Limit memory _limit, DailySpent memory _dailySpent) external;

    function getLimitAndDailySpent(address _wallet) external view returns (Limit memory _limit, DailySpent memory _dailySpent);
}

// Copyright (C) 2018  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.5.4 <0.7.0;

interface ILockStorage {
    function isLocked(address _wallet) external view returns (bool);

    function getLock(address _wallet) external view returns (uint256);

    function getLocker(address _wallet) external view returns (address);

    function setLock(address _wallet, address _locker, uint256 _releaseAfter) external;
}

// Copyright (C) 2018  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.s

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.6.12;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "../../wallet/IWallet.sol";
import "../../infrastructure/IModuleRegistry.sol";
import "../../infrastructure/storage/ILockStorage.sol";
import "./IFeature.sol";
import "../../../lib/other/ERC20.sol";
import "./IVersionManager.sol";

/**
 * @title BaseFeature
 * @notice Base Feature contract that contains methods common to all Feature contracts.
 * @author Julien Niset - <[email protected]>, Olivier VDB - <[email protected]>
 */
contract BaseFeature is IFeature {

    // Empty calldata
    bytes constant internal EMPTY_BYTES = "";
    // Mock token address for ETH
    address constant internal ETH_TOKEN = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    // The address of the Lock storage
    ILockStorage internal lockStorage;
    // The address of the Version Manager
    IVersionManager internal versionManager;

    event FeatureCreated(bytes32 name);

    /**
     * @notice Throws if the wallet is locked.
     */
    modifier onlyWhenUnlocked(address _wallet) {
        require(!lockStorage.isLocked(_wallet), "BF: wallet locked");
        _;
    }

    /**
     * @notice Throws if the sender is not the VersionManager.
     */
    modifier onlyVersionManager() {
        require(msg.sender == address(versionManager), "BF: caller must be VersionManager");
        _;
    }

    /**
     * @notice Throws if the sender is not the owner of the target wallet.
     */
    modifier onlyWalletOwner(address _wallet) {
        require(isOwner(_wallet, msg.sender), "BF: must be wallet owner");
        _;
    }

    /**
     * @notice Throws if the sender is not an authorised feature of the target wallet.
     */
    modifier onlyWalletFeature(address _wallet) {
        require(versionManager.isFeatureAuthorised(_wallet, msg.sender), "BF: must be a wallet feature");
        _;
    }

    /**
     * @notice Throws if the sender is not the owner of the target wallet or the feature itself.
     */
    modifier onlyWalletOwnerOrFeature(address _wallet) {
        // Wrapping in an internal method reduces deployment cost by avoiding duplication of inlined code
        verifyOwnerOrAuthorisedFeature(_wallet, msg.sender);
        _;
    }

    constructor(
        ILockStorage _lockStorage,
        IVersionManager _versionManager,
        bytes32 _name
    ) public {
        lockStorage = _lockStorage;
        versionManager = _versionManager;
        emit FeatureCreated(_name);
    }

    /**
    * @inheritdoc IFeature
    */
    function recoverToken(address _token) external virtual override {
        uint total = ERC20(_token).balanceOf(address(this));
        _token.call(abi.encodeWithSelector(ERC20(_token).transfer.selector, address(versionManager), total));
    }

    /**
     * @notice Inits the feature for a wallet by doing nothing.
     * @dev !! Overriding methods need make sure `init()` can only be called by the VersionManager !!
     * @param _wallet The wallet.
     */
    function init(address _wallet) external virtual override  {}

    /**
     * @inheritdoc IFeature
     */
    function getRequiredSignatures(address, bytes calldata) external virtual view override returns (uint256, OwnerSignature) {
        revert("BF: disabled method");
    }

    /**
     * @inheritdoc IFeature
     */
    function getStaticCallSignatures() external virtual override view returns (bytes4[] memory _sigs) {}

    /**
     * @inheritdoc IFeature
     */
    function isFeatureAuthorisedInVersionManager(address _wallet, address _feature) public override view returns (bool) {
        return versionManager.isFeatureAuthorised(_wallet, _feature);
    }

    /**
    * @notice Checks that the wallet address provided as the first parameter of _data matches _wallet
    * @return false if the addresses are different.
    */
    function verifyData(address _wallet, bytes calldata _data) internal pure returns (bool) {
        require(_data.length >= 36, "RM: Invalid dataWallet");
        address dataWallet = abi.decode(_data[4:], (address));
        return dataWallet == _wallet;
    }
    
     /**
     * @notice Helper method to check if an address is the owner of a target wallet.
     * @param _wallet The target wallet.
     * @param _addr The address.
     */
    function isOwner(address _wallet, address _addr) internal view returns (bool) {
        return IWallet(_wallet).owner() == _addr;
    }

    /**
     * @notice Verify that the caller is an authorised feature or the wallet owner.
     * @param _wallet The target wallet.
     * @param _sender The caller.
     */
    function verifyOwnerOrAuthorisedFeature(address _wallet, address _sender) internal view {
        require(isFeatureAuthorisedInVersionManager(_wallet, _sender) || isOwner(_wallet, _sender), "BF: must be owner or feature");
    }

    /**
     * @notice Helper method to invoke a wallet.
     * @param _wallet The target wallet.
     * @param _to The target address for the transaction.
     * @param _value The value of the transaction.
     * @param _data The data of the transaction.
     */
    function invokeWallet(address _wallet, address _to, uint256 _value, bytes memory _data)
        internal
        returns (bytes memory _res) 
    {
        _res = versionManager.checkAuthorisedFeatureAndInvokeWallet(_wallet, _to, _value, _data);
    }

}

// Copyright (C) 2018  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.5.4 <0.7.0;

/**
 * @title IFeature
 * @notice Interface for a Feature.
 * @author Julien Niset - <[email protected]>, Olivier VDB - <[email protected]>
 */
interface IFeature {

    enum OwnerSignature {
        Anyone,             // Anyone
        Required,           // Owner required
        Optional,           // Owner and/or guardians
        Disallowed          // guardians only
    }

    /**
    * @notice Utility method to recover any ERC20 token that was sent to the Feature by mistake.
    * @param _token The token to recover.
    */
    function recoverToken(address _token) external;

    /**
     * @notice Inits a Feature for a wallet by e.g. setting some wallet specific parameters in storage.
     * @param _wallet The wallet.
     */
    function init(address _wallet) external;

    /**
     * @notice Helper method to check if an address is an authorised feature of a target wallet.
     * @param _wallet The target wallet.
     * @param _feature The address.
     */
    function isFeatureAuthorisedInVersionManager(address _wallet, address _feature) external view returns (bool);

    /**
    * @notice Gets the number of valid signatures that must be provided to execute a
    * specific relayed transaction.
    * @param _wallet The target wallet.
    * @param _data The data of the relayed transaction.
    * @return The number of required signatures and the wallet owner signature requirement.
    */
    function getRequiredSignatures(address _wallet, bytes calldata _data) external view returns (uint256, OwnerSignature);

    /**
    * @notice Gets the list of static call signatures that this feature responds to on behalf of wallets
    */
    function getStaticCallSignatures() external view returns (bytes4[] memory);
}

// Copyright (C) 2018  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.5.4 <0.7.0;
pragma experimental ABIEncoderV2;

import "../../infrastructure/storage/ILimitStorage.sol";

/**
 * @title IVersionManager
 * @notice Interface for the VersionManager module.
 * @author Olivier VDB - <[email protected]>
 */
interface IVersionManager {
    /**
     * @notice Returns true if the feature is authorised for the wallet
     * @param _wallet The target wallet.
     * @param _feature The feature.
     */
    function isFeatureAuthorised(address _wallet, address _feature) external view returns (bool);

    /**
     * @notice Lets a feature (caller) invoke a wallet.
     * @param _wallet The target wallet.
     * @param _to The target address for the transaction.
     * @param _value The value of the transaction.
     * @param _data The data of the transaction.
     */
    function checkAuthorisedFeatureAndInvokeWallet(
        address _wallet,
        address _to,
        uint256 _value,
        bytes calldata _data
    ) external returns (bytes memory _res);

    /* ******* Backward Compatibility with old Storages and BaseWallet *************** */

    /**
     * @notice Sets a new owner for the wallet.
     * @param _newOwner The new owner.
     */
    function setOwner(address _wallet, address _newOwner) external;

    /**
     * @notice Lets a feature write data to a storage contract.
     * @param _wallet The target wallet.
     * @param _storage The storage contract.
     * @param _data The data of the call
     */
    function invokeStorage(address _wallet, address _storage, bytes calldata _data) external;

    /**
     * @notice Upgrade a wallet to a new version.
     * @param _wallet the wallet to upgrade
     * @param _toVersion the new version
     */
    function upgradeWallet(address _wallet, uint256 _toVersion) external;
 
}

// Copyright (C) 2018  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.5.4 <0.7.0;

/**
 * @title IWallet
 * @notice Interface for the BaseWallet
 */
interface IWallet {
    /**
     * @notice Returns the wallet owner.
     * @return The wallet owner address.
     */
    function owner() external view returns (address);

    /**
     * @notice Returns the number of authorised modules.
     * @return The number of authorised modules.
     */
    function modules() external view returns (uint);

    /**
     * @notice Sets a new owner for the wallet.
     * @param _newOwner The new owner.
     */
    function setOwner(address _newOwner) external;

    /**
     * @notice Checks if a module is authorised on the wallet.
     * @param _module The module address to check.
     * @return `true` if the module is authorised, otherwise `false`.
     */
    function authorised(address _module) external view returns (bool);

    /**
     * @notice Returns the module responsible for a static call redirection.
     * @param _sig The signature of the static call.
     * @return the module doing the redirection
     */
    function enabled(bytes4 _sig) external view returns (address);

    /**
     * @notice Enables/Disables a module.
     * @param _module The target module.
     * @param _value Set to `true` to authorise the module.
     */
    function authoriseModule(address _module, bool _value) external;

    /**
    * @notice Enables a static method by specifying the target module to which the call must be delegated.
    * @param _module The target module.
    * @param _method The static method signature.
    */
    function enableStaticCall(address _module, bytes4 _method) external;
}

pragma solidity >=0.5.4 <0.7.0;

/**
 * ERC20 contract interface.
 */
interface ERC20 {
    function totalSupply() external view returns (uint);
    function decimals() external view returns (uint);
    function balanceOf(address tokenOwner) external view returns (uint balance);
    function allowance(address tokenOwner, address spender) external view returns (uint remaining);
    function transfer(address to, uint tokens) external returns (bool success);
    function approve(address spender, uint tokens) external returns (bool success);
    function transferFrom(address from, address to, uint tokens) external returns (bool success);
}

pragma solidity >=0.5.4 <0.7.0;

interface IAugustusSwapper {
    function getTokenTransferProxy() external view returns (address);

    struct Route {
        address payable exchange;
        address targetExchange;
        uint percent;
        bytes payload;
        uint256 networkFee; // only used for 0xV3
    }

    struct Path {
        address to;
        uint256 totalNetworkFee; // only used for 0xV3
        Route[] routes;
    }

    struct BuyRoute {
        address payable exchange;
        address targetExchange;
        uint256 fromAmount;
        uint256 toAmount;
        bytes payload;
        uint256 networkFee; // only used for 0xV3
    }
}

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 999
  },
  "evmVersion": "istanbul",
  "libraries": {
    "": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract ILockStorage","name":"_lockStorage","type":"address"},{"internalType":"contract ITokenPriceRegistry","name":"_tokenPriceRegistry","type":"address"},{"internalType":"contract IVersionManager","name":"_versionManager","type":"address"},{"internalType":"contract IDexRegistry","name":"_dexRegistry","type":"address"},{"internalType":"address","name":"_paraswap","type":"address"},{"internalType":"string","name":"_referrer","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"name","type":"bytes32"}],"name":"FeatureCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"wallet","type":"address"},{"indexed":false,"internalType":"address","name":"srcToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"srcAmount","type":"uint256"},{"indexed":false,"internalType":"address","name":"destToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"destAmount","type":"uint256"}],"name":"TokenExchanged","type":"event"},{"inputs":[{"internalType":"address","name":"_wallet","type":"address"},{"internalType":"address","name":"_srcToken","type":"address"},{"internalType":"address","name":"_destToken","type":"address"},{"internalType":"uint256","name":"_maxSrcAmount","type":"uint256"},{"internalType":"uint256","name":"_destAmount","type":"uint256"},{"internalType":"uint256","name":"_expectedSrcAmount","type":"uint256"},{"components":[{"internalType":"address payable","name":"exchange","type":"address"},{"internalType":"address","name":"targetExchange","type":"address"},{"internalType":"uint256","name":"fromAmount","type":"uint256"},{"internalType":"uint256","name":"toAmount","type":"uint256"},{"internalType":"bytes","name":"payload","type":"bytes"},{"internalType":"uint256","name":"networkFee","type":"uint256"}],"internalType":"struct IAugustusSwapper.BuyRoute[]","name":"_routes","type":"tuple[]"},{"internalType":"uint256","name":"_mintPrice","type":"uint256"}],"name":"buy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"dexRegistry","outputs":[{"internalType":"contract IDexRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"getRequiredSignatures","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"enum IFeature.OwnerSignature","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getStaticCallSignatures","outputs":[{"internalType":"bytes4[]","name":"_sigs","type":"bytes4[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_wallet","type":"address"}],"name":"init","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_wallet","type":"address"},{"internalType":"address","name":"_feature","type":"address"}],"name":"isFeatureAuthorisedInVersionManager","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"paraswapProxy","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"paraswapSwapper","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"recoverToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"referrer","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_wallet","type":"address"},{"internalType":"address","name":"_srcToken","type":"address"},{"internalType":"address","name":"_destToken","type":"address"},{"internalType":"uint256","name":"_srcAmount","type":"uint256"},{"internalType":"uint256","name":"_minDestAmount","type":"uint256"},{"internalType":"uint256","name":"_expectedDestAmount","type":"uint256"},{"components":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"totalNetworkFee","type":"uint256"},{"components":[{"internalType":"address payable","name":"exchange","type":"address"},{"internalType":"address","name":"targetExchange","type":"address"},{"internalType":"uint256","name":"percent","type":"uint256"},{"internalType":"bytes","name":"payload","type":"bytes"},{"internalType":"uint256","name":"networkFee","type":"uint256"}],"internalType":"struct IAugustusSwapper.Route[]","name":"routes","type":"tuple[]"}],"internalType":"struct IAugustusSwapper.Path[]","name":"_path","type":"tuple[]"},{"internalType":"uint256","name":"_mintPrice","type":"uint256"}],"name":"sell","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"tokenPriceRegistry","outputs":[{"internalType":"contract ITokenPriceRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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