// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

import {Safe} from "../../Safe.sol";
import {HandlerContext} from "../HandlerContext.sol";
import {MarshalLib} from "./MarshalLib.sol";

interface IFallbackMethod {
    function handle(Safe safe, address sender, uint256 value, bytes calldata data) external returns (bytes memory result);
}

interface IStaticFallbackMethod {
    function handle(Safe safe, address sender, uint256 value, bytes calldata data) external view returns (bytes memory result);
}

/**
 * @title Base contract for Extensible Fallback Handlers
 * @dev This contract provides the base for storage and modifiers for extensible fallback handlers
 * @author mfw78 <mfw78@rndlabs.xyz>
 */
abstract contract ExtensibleBase is HandlerContext {
    // --- events ---
    event AddedSafeMethod(Safe indexed safe, bytes4 selector, bytes32 method);
    event ChangedSafeMethod(Safe indexed safe, bytes4 selector, bytes32 oldMethod, bytes32 newMethod);
    event RemovedSafeMethod(Safe indexed safe, bytes4 selector);

    // --- storage ---

    // A mapping of Safe => selector => method
    // The method is a bytes32 that is encoded as follows:
    // - The first byte is 0x00 if the method is static and 0x01 if the method is not static
    // - The last 20 bytes are the address of the handler contract
    // The method is encoded / decoded using the MarshalLib
    mapping(Safe => mapping(bytes4 => bytes32)) public safeMethods;

    // --- modifiers ---
    modifier onlySelf() {
        // Use the `HandlerContext._msgSender()` to get the caller of the fallback function
        // Use the `HandlerContext._manager()` to get the manager, which should be the Safe
        // Require that the caller is the Safe itself
        require(_msgSender() == _manager(), "only safe can call this method");
        _;
    }

    // --- internal ---

    function _setSafeMethod(Safe safe, bytes4 selector, bytes32 newMethod) internal {
        (, address newHandler) = MarshalLib.decode(newMethod);
        bytes32 oldMethod = safeMethods[safe][selector];
        (, address oldHandler) = MarshalLib.decode(oldMethod);

        if (address(newHandler) == address(0) && address(oldHandler) != address(0)) {
            delete safeMethods[safe][selector];
            emit RemovedSafeMethod(safe, selector);
        } else {
            safeMethods[safe][selector] = newMethod;
            if (address(oldHandler) == address(0)) {
                emit AddedSafeMethod(safe, selector, newMethod);
            } else {
                emit ChangedSafeMethod(safe, selector, oldMethod, newMethod);
            }
        }
    }

    /**
     * Dry code to get the Safe and the original `msg.sender` from the FallbackManager
     * @return safe The safe whose FallbackManager is making this call
     * @return sender The original `msg.sender` (as received by the FallbackManager)
     */
    function _getContext() internal view returns (Safe safe, address sender) {
        safe = Safe(payable(_manager()));
        sender = _msgSender();
    }

    /**
     * Get the context and the method handler applicable to the current call
     * @return safe The safe whose FallbackManager is making this call
     * @return sender The original `msg.sender` (as received by the FallbackManager)
     * @return isStatic Whether the method is static (`view`) or not
     * @return handler the address of the handler contract
     */
    function _getContextAndHandler() internal view returns (Safe safe, address sender, bool isStatic, address handler) {
        (safe, sender) = _getContext();
        (isStatic, handler) = MarshalLib.decode(safeMethods[safe][msg.sig]);
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

// Note: The ERC-165 identifier for this interface is 0x4e2312e0.
interface ERC1155TokenReceiver {
    /**
     * @notice Handle the receipt of a single ERC1155 token type.
     * @dev An ERC1155-compliant smart contract MUST call this function on the token recipient contract, at the end of a `safeTransferFrom` after the balance has been updated.
     *      This function MUST return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` (i.e. 0xf23a6e61) if it accepts the transfer.
     *      This function MUST revert if it rejects the transfer.
     *      Return of any other value than the prescribed keccak256 generated value MUST result in the transaction being reverted by the caller.
     * @param _operator  The address which initiated the transfer (i.e. msg.sender).
     * @param _from      The address which previously owned the token.
     * @param _id        The ID of the token being transferred.
     * @param _value     The amount of tokens being transferred.
     * @param _data      Additional data with no specified format.
     * @return           `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`.
     */
    function onERC1155Received(
        address _operator,
        address _from,
        uint256 _id,
        uint256 _value,
        bytes calldata _data
    ) external returns (bytes4);

    /**
     * @notice Handle the receipt of multiple ERC1155 token types.
     * @dev An ERC1155-compliant smart contract MUST call this function on the token recipient contract, at the end of a `safeBatchTransferFrom` after the balances have been updated.
     *      This function MUST return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` (i.e. 0xbc197c81) if it accepts the transfer(s).
     *      This function MUST revert if it rejects the transfer(s).
     *      Return of any other value than the prescribed keccak256 generated value MUST result in the transaction being reverted by the caller.
     * @param _operator  The address which initiated the batch transfer (i.e. msg.sender).
     * @param _from      The address which previously owned the token.
     * @param _ids       An array containing ids of each token being transferred (order and length must match _values array).
     * @param _values    An array containing amounts of each token being transferred (order and length must match _ids array).
     * @param _data      Additional data with no specified format.
     * @return           `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`.
     */
    function onERC1155BatchReceived(
        address _operator,
        address _from,
        uint256[] calldata _ids,
        uint256[] calldata _values,
        bytes calldata _data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

import {IERC165} from "../../interfaces/IERC165.sol";

import "./Base.sol";

interface IERC165Handler {
    function safeInterfaces(Safe safe, bytes4 interfaceId) external view returns (bool);

    function setSupportedInterface(bytes4 interfaceId, bool supported) external;

    function addSupportedInterfaceBatch(bytes4 interfaceId, bytes32[] calldata handlerWithSelectors) external;

    function removeSupportedInterfaceBatch(bytes4 interfaceId, bytes4[] calldata selectors) external;
}

abstract contract ERC165Handler is ExtensibleBase, IERC165Handler {
    // --- events ---

    event AddedInterface(Safe indexed safe, bytes4 interfaceId);
    event RemovedInterface(Safe indexed safe, bytes4 interfaceId);

    // --- storage ---

    mapping(Safe => mapping(bytes4 => bool)) public override safeInterfaces;

    // --- setters ---

    /**
     * Setter to indicate if an interface is supported (and thus reported by ERC165 supportsInterface)
     * @param interfaceId The interface id whose support is to be set
     * @param supported True if the interface is supported, false otherwise
     */
    function setSupportedInterface(bytes4 interfaceId, bool supported) public override onlySelf {
        Safe safe = Safe(payable(_manager()));
        // invalid interface id per ERC165 spec
        require(interfaceId != 0xffffffff, "invalid interface id");
        bool current = safeInterfaces[safe][interfaceId];
        if (supported && !current) {
            safeInterfaces[safe][interfaceId] = true;
            emit AddedInterface(safe, interfaceId);
        } else if (!supported && current) {
            delete safeInterfaces[safe][interfaceId];
            emit RemovedInterface(safe, interfaceId);
        }
    }

    /**
     * Batch add selectors for an interface.
     * @param _interfaceId The interface id to set
     * @param handlerWithSelectors The handlers encoded with the 4-byte selectors of the methods
     */
    function addSupportedInterfaceBatch(bytes4 _interfaceId, bytes32[] calldata handlerWithSelectors) external override onlySelf {
        Safe safe = Safe(payable(_msgSender()));
        bytes4 interfaceId;
        for (uint256 i = 0; i < handlerWithSelectors.length; i++) {
            (bool isStatic, bytes4 selector, address handlerAddress) = MarshalLib.decodeWithSelector(handlerWithSelectors[i]);
            _setSafeMethod(safe, selector, MarshalLib.encode(isStatic, handlerAddress));
            if (i > 0) {
                interfaceId ^= selector;
            } else {
                interfaceId = selector;
            }
        }

        require(interfaceId == _interfaceId, "interface id mismatch");
        setSupportedInterface(_interfaceId, true);
    }

    /**
     * Batch remove selectors for an interface.
     * @param _interfaceId the interface id to remove
     * @param selectors The selectors of the methods to remove
     */
    function removeSupportedInterfaceBatch(bytes4 _interfaceId, bytes4[] calldata selectors) external override onlySelf {
        Safe safe = Safe(payable(_msgSender()));
        bytes4 interfaceId;
        for (uint256 i = 0; i < selectors.length; i++) {
            _setSafeMethod(safe, selectors[i], bytes32(0));
            if (i > 0) {
                interfaceId ^= selectors[i];
            } else {
                interfaceId = selectors[i];
            }
        }

        require(interfaceId == _interfaceId, "interface id mismatch");
        setSupportedInterface(_interfaceId, false);
    }

    /**
     * @notice Implements ERC165 interface detection for the supported interfaces
     * @dev Inheriting contracts should override `_supportsInterface` to add support for additional interfaces
     * @param interfaceId The ERC165 interface id to check
     * @return True if the interface is supported
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool) {
        return
            interfaceId == type(IERC165).interfaceId ||
            interfaceId == type(IERC165Handler).interfaceId ||
            _supportsInterface(interfaceId) ||
            safeInterfaces[Safe(payable(_manager()))][interfaceId];
    }

    // --- internal ---

    /**
     * A stub function to be overridden by inheriting contracts to add support for additional interfaces
     * @param interfaceId The interface id to check support for
     * @return True if the interface is supported
     */
    function _supportsInterface(bytes4 interfaceId) internal view virtual returns (bool);
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/// @dev Note: the ERC-165 identifier for this interface is 0x150b7a02.
interface ERC721TokenReceiver {
    /**
     * @notice Handle the receipt of an NFT
     * @dev The ERC721 smart contract calls this function on the recipient
     *  after a `transfer`. This function MAY throw to revert and reject the
     *  transfer. Return of other than the magic value MUST result in the
     *  transaction being reverted.
     *  Note: the contract address is always the message sender.
     * @param _operator The address which called `safeTransferFrom` function.
     * @param _from The address which previously owned the token.
     * @param _tokenId The NFT identifier which is being transferred.
     * @param _data Additional data with no specified format.
     * @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`.
     *  unless throwing
     */
    function onERC721Received(address _operator, address _from, uint256 _tokenId, bytes calldata _data) external returns (bytes4);
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Enum - Collection of enums used in Safe contracts.
 * @author Richard Meissner - @rmeissner
 */
abstract contract Enum {
    enum Operation {
        Call,
        DelegateCall
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/Enum.sol";

/**
 * @title Executor - A contract that can execute transactions
 * @author Richard Meissner - @rmeissner
 */
abstract contract Executor {
    /**
     * @notice Executes either a delegatecall or a call with provided parameters.
     * @dev This method doesn't perform any sanity check of the transaction, such as:
     *      - if the contract at `to` address has code or not
     *      It is the responsibility of the caller to perform such checks.
     * @param to Destination address.
     * @param value Ether value.
     * @param data Data payload.
     * @param operation Operation type.
     * @return success boolean flag indicating if the call succeeded.
     */
    function execute(
        address to,
        uint256 value,
        bytes memory data,
        Enum.Operation operation,
        uint256 txGas
    ) internal returns (bool success) {
        if (operation == Enum.Operation.DelegateCall) {
            // solhint-disable-next-line no-inline-assembly
            assembly {
                success := delegatecall(txGas, to, add(data, 0x20), mload(data), 0, 0)
            }
        } else {
            // solhint-disable-next-line no-inline-assembly
            assembly {
                success := call(txGas, to, value, add(data, 0x20), mload(data), 0, 0)
            }
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

import "./extensible/FallbackHandler.sol";
import "./extensible/SignatureVerifierMuxer.sol";
import "./extensible/TokenCallbacks.sol";
import "./extensible/ERC165Handler.sol";

/**
 * @title ExtensibleFallbackHandler - A fully extensible fallback handler for Safes
 * @dev Designed to be used with Safe >= 1.3.0.
 * @author mfw78 <mfw78@rndlabs.xyz>
 */
contract ExtensibleFallbackHandler is FallbackHandler, SignatureVerifierMuxer, TokenCallbacks, ERC165Handler {
    /**
     * Specify specific interfaces (ERC721 + ERC1155) that this contract supports.
     * @param interfaceId The interface ID to check for support
     */
    function _supportsInterface(bytes4 interfaceId) internal pure override returns (bool) {
        return
            interfaceId == type(ERC1271).interfaceId ||
            interfaceId == type(ISignatureVerifierMuxer).interfaceId ||
            interfaceId == type(ERC165Handler).interfaceId ||
            interfaceId == type(IFallbackHandler).interfaceId ||
            interfaceId == type(ERC721TokenReceiver).interfaceId ||
            interfaceId == type(ERC1155TokenReceiver).interfaceId;
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

import "./Base.sol";

interface IFallbackHandler {
    function setSafeMethod(bytes4 selector, bytes32 newMethod) external;
}

/**
 * @title FallbackHandler - A fully extensible fallback handler for Safes
 * @dev This contract provides a fallback handler for Safes that can be extended with custom fallback handlers
 *      for specific methods.
 * @author mfw78 <mfw78@rndlabs.xyz>
 */
abstract contract FallbackHandler is ExtensibleBase, IFallbackHandler {
    // --- setters ---

    /**
     * Setter for custom method handlers
     * @param selector The `bytes4` selector of the method to set the handler for
     * @param newMethod A contract that implements the `IFallbackMethod` or `IStaticFallbackMethod` interface
     */
    function setSafeMethod(bytes4 selector, bytes32 newMethod) public override onlySelf {
        _setSafeMethod(Safe(payable(_msgSender())), selector, newMethod);
    }

    // --- fallback ---

    fallback(bytes calldata) external returns (bytes memory result) {
        require(msg.data.length >= 24, "invalid method selector");
        (Safe safe, address sender, bool isStatic, address handler) = _getContextAndHandler();
        require(handler != address(0), "method handler not set");

        if (isStatic) {
            result = IStaticFallbackMethod(handler).handle(safe, sender, 0, msg.data[:msg.data.length - 20]);
        } else {
            result = IFallbackMethod(handler).handle(safe, sender, 0, msg.data[:msg.data.length - 20]);
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

import "../common/SelfAuthorized.sol";

/**
 * @title Fallback Manager - A contract managing fallback calls made to this contract
 * @author Richard Meissner - @rmeissner
 */
abstract contract FallbackManager is SelfAuthorized {
    event ChangedFallbackHandler(address indexed handler);

    // keccak256("fallback_manager.handler.address")
    bytes32 internal constant FALLBACK_HANDLER_STORAGE_SLOT = 0x6c9a6c4a39284e37ed1cf53d337577d14212a4870fb976a4366c693b939918d5;

    /**
     *  @notice Internal function to set the fallback handler.
     *  @param handler contract to handle fallback calls.
     */
    function internalSetFallbackHandler(address handler) internal {
        /*
            If a fallback handler is set to self, then the following attack vector is opened:
            Imagine we have a function like this:
            function withdraw() internal authorized {
                withdrawalAddress.call.value(address(this).balance)("");
            }

            If the fallback method is triggered, the fallback handler appends the msg.sender address to the calldata and calls the fallback handler.
            A potential attacker could call a Safe with the 3 bytes signature of a withdraw function. Since 3 bytes do not create a valid signature,
            the call would end in a fallback handler. Since it appends the msg.sender address to the calldata, the attacker could craft an address 
            where the first 3 bytes of the previous calldata + the first byte of the address make up a valid function signature. The subsequent call would result in unsanctioned access to Safe's internal protected methods.
            For some reason, solidity matches the first 4 bytes of the calldata to a function signature, regardless if more data follow these 4 bytes.
        */
        require(handler != address(this), "GS400");

        bytes32 slot = FALLBACK_HANDLER_STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, handler)
        }
    }

    /**
     * @notice Set Fallback Handler to `handler` for the Safe.
     * @dev Only fallback calls without value and with data will be forwarded.
     *      This can only be done via a Safe transaction.
     *      Cannot be set to the Safe itself.
     * @param handler contract to handle fallback calls.
     */
    function setFallbackHandler(address handler) public authorized {
        internalSetFallbackHandler(handler);
        emit ChangedFallbackHandler(handler);
    }

    // @notice Forwards all calls to the fallback handler if set. Returns 0 if no handler is set.
    // @dev Appends the non-padded caller address to the calldata to be optionally used in the handler
    //      The handler can make us of `HandlerContext.sol` to extract the address.
    //      This is done because in the next call frame the `msg.sender` will be FallbackManager's address
    //      and having the original caller address may enable additional verification scenarios.
    // solhint-disable-next-line payable-fallback,no-complex-fallback
    fallback() external {
        bytes32 slot = FALLBACK_HANDLER_STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let handler := sload(slot)
            if iszero(handler) {
                return(0, 0)
            }
            calldatacopy(0, 0, calldatasize())
            // The msg.sender address is shifted to the left by 12 bytes to remove the padding
            // Then the address without padding is stored right after the calldata
            mstore(calldatasize(), shl(96, caller()))
            // Add 20 bytes for the address appended add the end
            let success := call(gas(), handler, 0, 0, add(calldatasize(), 20), 0, 0)
            returndatacopy(0, 0, returndatasize())
            if iszero(success) {
                revert(0, returndatasize())
            }
            return(0, returndatasize())
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

import "../common/Enum.sol";
import "../common/SelfAuthorized.sol";
import "../interfaces/IERC165.sol";

interface Guard is IERC165 {
    function checkTransaction(
        address to,
        uint256 value,
        bytes memory data,
        Enum.Operation operation,
        uint256 safeTxGas,
        uint256 baseGas,
        uint256 gasPrice,
        address gasToken,
        address payable refundReceiver,
        bytes memory signatures,
        address msgSender
    ) external;

    function checkAfterExecution(bytes32 txHash, bool success) external;
}

abstract contract BaseGuard is Guard {
    function supportsInterface(bytes4 interfaceId) external view virtual override returns (bool) {
        return
            interfaceId == type(Guard).interfaceId || // 0xe6d7a83a
            interfaceId == type(IERC165).interfaceId; // 0x01ffc9a7
    }
}

/**
 * @title Guard Manager - A contract managing transaction guards which perform pre and post-checks on Safe transactions.
 * @author Richard Meissner - @rmeissner
 */
abstract contract GuardManager is SelfAuthorized {
    event ChangedGuard(address indexed guard);

    // keccak256("guard_manager.guard.address")
    bytes32 internal constant GUARD_STORAGE_SLOT = 0x4a204f620c8c5ccdca3fd54d003badd85ba500436a431f0cbda4f558c93c34c8;

    /**
     * @dev Set a guard that checks transactions before execution
     *      This can only be done via a Safe transaction.
     *      ⚠️ IMPORTANT: Since a guard has full power to block Safe transaction execution,
     *        a broken guard can cause a denial of service for the Safe. Make sure to carefully
     *        audit the guard code and design recovery mechanisms.
     * @notice Set Transaction Guard `guard` for the Safe. Make sure you trust the guard.
     * @param guard The address of the guard to be used or the 0 address to disable the guard
     */
    function setGuard(address guard) external authorized {
        if (guard != address(0)) {
            require(Guard(guard).supportsInterface(type(Guard).interfaceId), "GS300");
        }
        bytes32 slot = GUARD_STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, guard)
        }
        emit ChangedGuard(guard);
    }

    /**
     * @dev Internal method to retrieve the current guard
     *      We do not have a public method because we're short on bytecode size limit,
     *      to retrieve the guard address, one can use `getStorageAt` from `StorageAccessible` contract
     *      with the slot `GUARD_STORAGE_SLOT`
     * @return guard The address of the guard
     */
    function getGuard() internal view returns (address guard) {
        bytes32 slot = GUARD_STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            guard := sload(slot)
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Handler Context - Allows the fallback handler to extract addition context from the calldata
 * @dev The fallback manager appends the following context to the calldata:
 *      1. Fallback manager caller address (non-padded)
 * based on https://github.com/OpenZeppelin/openzeppelin-contracts/blob/f8cc8b844a9f92f63dc55aa581f7d643a1bc5ac1/contracts/metatx/ERC2771Context.sol
 * @author Richard Meissner - @rmeissner
 */
abstract contract HandlerContext {
    /**
     * @notice Allows fetching the original caller address.
     * @dev This is only reliable in combination with a FallbackManager that supports this (e.g. Safe contract >=1.3.0).
     *      When using this functionality make sure that the linked _manager (aka msg.sender) supports this.
     *      This function does not rely on a trusted forwarder. Use the returned value only to
     *      check information against the calling manager.
     * @return sender Original caller address.
     */
    function _msgSender() internal pure returns (address sender) {
        require(msg.data.length >= 20, "Invalid calldata length");
        // The assembly code is more direct than the Solidity version using `abi.decode`.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sender := shr(96, calldataload(sub(calldatasize(), 20)))
        }
    }

    /**
     * @notice Returns the FallbackManager address
     * @return Fallback manager address
     */
    function _manager() internal view returns (address) {
        return msg.sender;
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/// @notice More details at https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/introspection/IERC165.sol
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by `interfaceId`.
     * See the corresponding EIP section
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

contract ISignatureValidatorConstants {
    // bytes4(keccak256("isValidSignature(bytes,bytes)")
    bytes4 internal constant EIP1271_MAGIC_VALUE = 0x20c13b0b;
}

abstract contract ISignatureValidator is ISignatureValidatorConstants {
    /**
     * @notice Legacy EIP1271 method to validate a signature.
     * @param _data Arbitrary length data signed on the behalf of address(this).
     * @param _signature Signature byte array associated with _data.
     *
     * MUST return the bytes4 magic value 0x20c13b0b when function passes.
     * MUST NOT modify state (using STATICCALL for solc < 0.5, view modifier for solc > 0.5)
     * MUST allow external calls
     */
    function isValidSignature(bytes memory _data, bytes memory _signature) public view virtual returns (bytes4);
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

library MarshalLib {
    /**
     * Encode a method handler into a `bytes32` value
     * @dev The first byte of the `bytes32` value is set to 0x01 if the method is not static (`view`)
     * @dev The last 20 bytes of the `bytes32` value are set to the address of the handler contract
     * @param isStatic Whether the method is static (`view`) or not
     * @param handler The address of the handler contract implementing the `IFallbackMethod` or `IStaticFallbackMethod` interface
     */
    function encode(bool isStatic, address handler) internal pure returns (bytes32 data) {
        data = bytes32(uint256(uint160(handler)) | (isStatic ? 0 : (1 << 248)));
    }

    function encodeWithSelector(bool isStatic, bytes4 selector, address handler) internal pure returns (bytes32 data) {
        data = bytes32(uint256(uint160(handler)) | (isStatic ? 0 : (1 << 248)) | (uint256(uint32(selector)) << 216));
    }

    /**
     * Given a `bytes32` value, decode it into a method handler and return it
     * @param data The packed data to decode
     * @return isStatic Whether the method is static (`view`) or not
     * @return handler The address of the handler contract implementing the `IFallbackMethod` or `IStaticFallbackMethod` interface
     */
    function decode(bytes32 data) internal pure returns (bool isStatic, address handler) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // set isStatic to true if the left-most byte of the data is not 0x00
            isStatic := iszero(shr(248, data))
            handler := shr(96, shl(96, data))
        }
    }

    function decodeWithSelector(bytes32 data) internal pure returns (bool isStatic, bytes4 selector, address handler) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // set isStatic to true if the left-most byte of the data is not 0x00
            isStatic := iszero(shr(248, data))
            handler := shr(96, shl(96, data))
            selector := shl(168, shr(160, data))
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/Enum.sol";
import "../common/SelfAuthorized.sol";
import "./Executor.sol";

/**
 * @title Module Manager - A contract managing Safe modules
 * @notice Modules are extensions with unlimited access to a Safe that can be added to a Safe by its owners.
           ⚠️ WARNING: Modules are a security risk since they can execute arbitrary transactions, 
           so only trusted and audited modules should be added to a Safe. A malicious module can
           completely takeover a Safe.
 * @author Stefan George - @Georgi87
 * @author Richard Meissner - @rmeissner
 */
abstract contract ModuleManager is SelfAuthorized, Executor {
    event EnabledModule(address indexed module);
    event DisabledModule(address indexed module);
    event ExecutionFromModuleSuccess(address indexed module);
    event ExecutionFromModuleFailure(address indexed module);

    address internal constant SENTINEL_MODULES = address(0x1);

    mapping(address => address) internal modules;

    /**
     * @notice Setup function sets the initial storage of the contract.
     *         Optionally executes a delegate call to another contract to setup the modules.
     * @param to Optional destination address of call to execute.
     * @param data Optional data of call to execute.
     */
    function setupModules(address to, bytes memory data) internal {
        require(modules[SENTINEL_MODULES] == address(0), "GS100");
        modules[SENTINEL_MODULES] = SENTINEL_MODULES;
        if (to != address(0)) {
            require(isContract(to), "GS002");
            // Setup has to complete successfully or transaction fails.
            require(execute(to, 0, data, Enum.Operation.DelegateCall, type(uint256).max), "GS000");
        }
    }

    /**
     * @notice Enables the module `module` for the Safe.
     * @dev This can only be done via a Safe transaction.
     * @param module Module to be whitelisted.
     */
    function enableModule(address module) public authorized {
        // Module address cannot be null or sentinel.
        require(module != address(0) && module != SENTINEL_MODULES, "GS101");
        // Module cannot be added twice.
        require(modules[module] == address(0), "GS102");
        modules[module] = modules[SENTINEL_MODULES];
        modules[SENTINEL_MODULES] = module;
        emit EnabledModule(module);
    }

    /**
     * @notice Disables the module `module` for the Safe.
     * @dev This can only be done via a Safe transaction.
     * @param prevModule Previous module in the modules linked list.
     * @param module Module to be removed.
     */
    function disableModule(address prevModule, address module) public authorized {
        // Validate module address and check that it corresponds to module index.
        require(module != address(0) && module != SENTINEL_MODULES, "GS101");
        require(modules[prevModule] == module, "GS103");
        modules[prevModule] = modules[module];
        modules[module] = address(0);
        emit DisabledModule(module);
    }

    /**
     * @notice Execute `operation` (0: Call, 1: DelegateCall) to `to` with `value` (Native Token)
     * @dev Function is virtual to allow overriding for L2 singleton to emit an event for indexing.
     * @param to Destination address of module transaction.
     * @param value Ether value of module transaction.
     * @param data Data payload of module transaction.
     * @param operation Operation type of module transaction.
     * @return success Boolean flag indicating if the call succeeded.
     */
    function execTransactionFromModule(
        address to,
        uint256 value,
        bytes memory data,
        Enum.Operation operation
    ) public virtual returns (bool success) {
        // Only whitelisted modules are allowed.
        require(msg.sender != SENTINEL_MODULES && modules[msg.sender] != address(0), "GS104");
        // Execute transaction without further confirmations.
        success = execute(to, value, data, operation, type(uint256).max);
        if (success) emit ExecutionFromModuleSuccess(msg.sender);
        else emit ExecutionFromModuleFailure(msg.sender);
    }

    /**
     * @notice Execute `operation` (0: Call, 1: DelegateCall) to `to` with `value` (Native Token) and return data
     * @param to Destination address of module transaction.
     * @param value Ether value of module transaction.
     * @param data Data payload of module transaction.
     * @param operation Operation type of module transaction.
     * @return success Boolean flag indicating if the call succeeded.
     * @return returnData Data returned by the call.
     */
    function execTransactionFromModuleReturnData(
        address to,
        uint256 value,
        bytes memory data,
        Enum.Operation operation
    ) public returns (bool success, bytes memory returnData) {
        success = execTransactionFromModule(to, value, data, operation);
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Load free memory location
            let ptr := mload(0x40)
            // We allocate memory for the return data by setting the free memory location to
            // current free memory location + data size + 32 bytes for data size value
            mstore(0x40, add(ptr, add(returndatasize(), 0x20)))
            // Store the size
            mstore(ptr, returndatasize())
            // Store the data
            returndatacopy(add(ptr, 0x20), 0, returndatasize())
            // Point the return data to the correct memory location
            returnData := ptr
        }
    }

    /**
     * @notice Returns if an module is enabled
     * @return True if the module is enabled
     */
    function isModuleEnabled(address module) public view returns (bool) {
        return SENTINEL_MODULES != module && modules[module] != address(0);
    }

    /**
     * @notice Returns an array of modules.
     *         If all entries fit into a single page, the next pointer will be 0x1.
     *         If another page is present, next will be the last element of the returned array.
     * @param start Start of the page. Has to be a module or start pointer (0x1 address)
     * @param pageSize Maximum number of modules that should be returned. Has to be > 0
     * @return array Array of modules.
     * @return next Start of the next page.
     */
    function getModulesPaginated(address start, uint256 pageSize) external view returns (address[] memory array, address next) {
        require(start == SENTINEL_MODULES || isModuleEnabled(start), "GS105");
        require(pageSize > 0, "GS106");
        // Init array with max page size
        array = new address[](pageSize);

        // Populate return array
        uint256 moduleCount = 0;
        next = modules[start];
        while (next != address(0) && next != SENTINEL_MODULES && moduleCount < pageSize) {
            array[moduleCount] = next;
            next = modules[next];
            moduleCount++;
        }

        /**
          Because of the argument validation, we can assume that the loop will always iterate over the valid module list values
          and the `next` variable will either be an enabled module or a sentinel address (signalling the end). 
          
          If we haven't reached the end inside the loop, we need to set the next pointer to the last element of the modules array
          because the `next` variable (which is a module by itself) acting as a pointer to the start of the next page is neither 
          included to the current page, nor will it be included in the next one if you pass it as a start.
        */
        if (next != SENTINEL_MODULES) {
            next = array[moduleCount - 1];
        }
        // Set correct size of returned array
        // solhint-disable-next-line no-inline-assembly
        assembly {
            mstore(array, moduleCount)
        }
    }

    /**
     * @notice Returns true if `account` is a contract.
     * @dev This function will return false if invoked during the constructor of a contract,
     *      as the code is not actually created until after the constructor finishes.
     * @param account The address being queried
     */
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/**
 * @title NativeCurrencyPaymentFallback - A contract that has a fallback to accept native currency payments.
 * @author Richard Meissner - @rmeissner
 */
abstract contract NativeCurrencyPaymentFallback {
    event SafeReceived(address indexed sender, uint256 value);

    /**
     * @notice Receive function accepts native currency transactions.
     * @dev Emits an event with sender and received value.
     */
    receive() external payable {
        emit SafeReceived(msg.sender, msg.value);
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/SelfAuthorized.sol";

/**
 * @title OwnerManager - Manages Safe owners and a threshold to authorize transactions.
 * @dev Uses a linked list to store the owners because the code generate by the solidity compiler
 *      is more efficient than using a dynamic array.
 * @author Stefan George - @Georgi87
 * @author Richard Meissner - @rmeissner
 */
abstract contract OwnerManager is SelfAuthorized {
    event AddedOwner(address indexed owner);
    event RemovedOwner(address indexed owner);
    event ChangedThreshold(uint256 threshold);

    address internal constant SENTINEL_OWNERS = address(0x1);

    mapping(address => address) internal owners;
    uint256 internal ownerCount;
    uint256 internal threshold;

    /**
     * @notice Sets the initial storage of the contract.
     * @param _owners List of Safe owners.
     * @param _threshold Number of required confirmations for a Safe transaction.
     */
    function setupOwners(address[] memory _owners, uint256 _threshold) internal {
        // Threshold can only be 0 at initialization.
        // Check ensures that setup function can only be called once.
        require(threshold == 0, "GS200");
        // Validate that threshold is smaller than number of added owners.
        require(_threshold <= _owners.length, "GS201");
        // There has to be at least one Safe owner.
        require(_threshold >= 1, "GS202");
        // Initializing Safe owners.
        address currentOwner = SENTINEL_OWNERS;
        for (uint256 i = 0; i < _owners.length; i++) {
            // Owner address cannot be null.
            address owner = _owners[i];
            require(owner != address(0) && owner != SENTINEL_OWNERS && owner != address(this) && currentOwner != owner, "GS203");
            // No duplicate owners allowed.
            require(owners[owner] == address(0), "GS204");
            owners[currentOwner] = owner;
            currentOwner = owner;
        }
        owners[currentOwner] = SENTINEL_OWNERS;
        ownerCount = _owners.length;
        threshold = _threshold;
    }

    /**
     * @notice Adds the owner `owner` to the Safe and updates the threshold to `_threshold`.
     * @dev This can only be done via a Safe transaction.
     * @param owner New owner address.
     * @param _threshold New threshold.
     */
    function addOwnerWithThreshold(address owner, uint256 _threshold) public authorized {
        // Owner address cannot be null, the sentinel or the Safe itself.
        require(owner != address(0) && owner != SENTINEL_OWNERS && owner != address(this), "GS203");
        // No duplicate owners allowed.
        require(owners[owner] == address(0), "GS204");
        owners[owner] = owners[SENTINEL_OWNERS];
        owners[SENTINEL_OWNERS] = owner;
        ownerCount++;
        emit AddedOwner(owner);
        // Change threshold if threshold was changed.
        if (threshold != _threshold) changeThreshold(_threshold);
    }

    /**
     * @notice Removes the owner `owner` from the Safe and updates the threshold to `_threshold`.
     * @dev This can only be done via a Safe transaction.
     * @param prevOwner Owner that pointed to the owner to be removed in the linked list
     * @param owner Owner address to be removed.
     * @param _threshold New threshold.
     */
    function removeOwner(address prevOwner, address owner, uint256 _threshold) public authorized {
        // Only allow to remove an owner, if threshold can still be reached.
        require(ownerCount - 1 >= _threshold, "GS201");
        // Validate owner address and check that it corresponds to owner index.
        require(owner != address(0) && owner != SENTINEL_OWNERS, "GS203");
        require(owners[prevOwner] == owner, "GS205");
        owners[prevOwner] = owners[owner];
        owners[owner] = address(0);
        ownerCount--;
        emit RemovedOwner(owner);
        // Change threshold if threshold was changed.
        if (threshold != _threshold) changeThreshold(_threshold);
    }

    /**
     * @notice Replaces the owner `oldOwner` in the Safe with `newOwner`.
     * @dev This can only be done via a Safe transaction.
     * @param prevOwner Owner that pointed to the owner to be replaced in the linked list
     * @param oldOwner Owner address to be replaced.
     * @param newOwner New owner address.
     */
    function swapOwner(address prevOwner, address oldOwner, address newOwner) public authorized {
        // Owner address cannot be null, the sentinel or the Safe itself.
        require(newOwner != address(0) && newOwner != SENTINEL_OWNERS && newOwner != address(this), "GS203");
        // No duplicate owners allowed.
        require(owners[newOwner] == address(0), "GS204");
        // Validate oldOwner address and check that it corresponds to owner index.
        require(oldOwner != address(0) && oldOwner != SENTINEL_OWNERS, "GS203");
        require(owners[prevOwner] == oldOwner, "GS205");
        owners[newOwner] = owners[oldOwner];
        owners[prevOwner] = newOwner;
        owners[oldOwner] = address(0);
        emit RemovedOwner(oldOwner);
        emit AddedOwner(newOwner);
    }

    /**
     * @notice Changes the threshold of the Safe to `_threshold`.
     * @dev This can only be done via a Safe transaction.
     * @param _threshold New threshold.
     */
    function changeThreshold(uint256 _threshold) public authorized {
        // Validate that threshold is smaller than number of owners.
        require(_threshold <= ownerCount, "GS201");
        // There has to be at least one Safe owner.
        require(_threshold >= 1, "GS202");
        threshold = _threshold;
        emit ChangedThreshold(threshold);
    }

    /**
     * @notice Returns the number of required confirmations for a Safe transaction aka the threshold.
     * @return Threshold number.
     */
    function getThreshold() public view returns (uint256) {
        return threshold;
    }

    /**
     * @notice Returns if `owner` is an owner of the Safe.
     * @return Boolean if owner is an owner of the Safe.
     */
    function isOwner(address owner) public view returns (bool) {
        return owner != SENTINEL_OWNERS && owners[owner] != address(0);
    }

    /**
     * @notice Returns a list of Safe owners.
     * @return Array of Safe owners.
     */
    function getOwners() public view returns (address[] memory) {
        address[] memory array = new address[](ownerCount);

        // populate return array
        uint256 index = 0;
        address currentOwner = owners[SENTINEL_OWNERS];
        while (currentOwner != SENTINEL_OWNERS) {
            array[index] = currentOwner;
            currentOwner = owners[currentOwner];
            index++;
        }
        return array;
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

import "./base/ModuleManager.sol";
import "./base/OwnerManager.sol";
import "./base/FallbackManager.sol";
import "./base/GuardManager.sol";
import "./common/NativeCurrencyPaymentFallback.sol";
import "./common/Singleton.sol";
import "./common/SignatureDecoder.sol";
import "./common/SecuredTokenTransfer.sol";
import "./common/StorageAccessible.sol";
import "./interfaces/ISignatureValidator.sol";
import "./external/SafeMath.sol";

/**
 * @title Safe - A multisignature wallet with support for confirmations using signed messages based on EIP-712.
 * @dev Most important concepts:
 *      - Threshold: Number of required confirmations for a Safe transaction.
 *      - Owners: List of addresses that control the Safe. They are the only ones that can add/remove owners, change the threshold and
 *        approve transactions. Managed in `OwnerManager`.
 *      - Transaction Hash: Hash of a transaction is calculated using the EIP-712 typed structured data hashing scheme.
 *      - Nonce: Each transaction should have a different nonce to prevent replay attacks.
 *      - Signature: A valid signature of an owner of the Safe for a transaction hash.
 *      - Guard: Guard is a contract that can execute pre- and post- transaction checks. Managed in `GuardManager`.
 *      - Modules: Modules are contracts that can be used to extend the write functionality of a Safe. Managed in `ModuleManager`.
 *      - Fallback: Fallback handler is a contract that can provide additional read-only functional for Safe. Managed in `FallbackManager`.
 *      Note: This version of the implementation contract doesn't emit events for the sake of gas efficiency and therefore requires a tracing node for indexing/
 *      For the events-based implementation see `SafeL2.sol`.
 * @author Stefan George - @Georgi87
 * @author Richard Meissner - @rmeissner
 */
contract Safe is
    Singleton,
    NativeCurrencyPaymentFallback,
    ModuleManager,
    OwnerManager,
    SignatureDecoder,
    SecuredTokenTransfer,
    ISignatureValidatorConstants,
    FallbackManager,
    StorageAccessible,
    GuardManager
{
    using SafeMath for uint256;

    string public constant VERSION = "1.4.1";

    // keccak256(
    //     "EIP712Domain(uint256 chainId,address verifyingContract)"
    // );
    bytes32 private constant DOMAIN_SEPARATOR_TYPEHASH = 0x47e79534a245952e8b16893a336b85a3d9ea9fa8c573f3d803afb92a79469218;

    // keccak256(
    //     "SafeTx(address to,uint256 value,bytes data,uint8 operation,uint256 safeTxGas,uint256 baseGas,uint256 gasPrice,address gasToken,address refundReceiver,uint256 nonce)"
    // );
    bytes32 private constant SAFE_TX_TYPEHASH = 0xbb8310d486368db6bd6f849402fdd73ad53d316b5a4b2644ad6efe0f941286d8;

    event SafeSetup(address indexed initiator, address[] owners, uint256 threshold, address initializer, address fallbackHandler);
    event ApproveHash(bytes32 indexed approvedHash, address indexed owner);
    event SignMsg(bytes32 indexed msgHash);
    event ExecutionFailure(bytes32 indexed txHash, uint256 payment);
    event ExecutionSuccess(bytes32 indexed txHash, uint256 payment);

    uint256 public nonce;
    bytes32 private _deprecatedDomainSeparator;
    // Mapping to keep track of all message hashes that have been approved by ALL REQUIRED owners
    mapping(bytes32 => uint256) public signedMessages;
    // Mapping to keep track of all hashes (message or transaction) that have been approved by ANY owners
    mapping(address => mapping(bytes32 => uint256)) public approvedHashes;

    // This constructor ensures that this contract can only be used as a singleton for Proxy contracts
    constructor() {
        /**
         * By setting the threshold it is not possible to call setup anymore,
         * so we create a Safe with 0 owners and threshold 1.
         * This is an unusable Safe, perfect for the singleton
         */
        threshold = 1;
    }

    /**
     * @notice Sets an initial storage of the Safe contract.
     * @dev This method can only be called once.
     *      If a proxy was created without setting up, anyone can call setup and claim the proxy.
     * @param _owners List of Safe owners.
     * @param _threshold Number of required confirmations for a Safe transaction.
     * @param to Contract address for optional delegate call.
     * @param data Data payload for optional delegate call.
     * @param fallbackHandler Handler for fallback calls to this contract
     * @param paymentToken Token that should be used for the payment (0 is ETH)
     * @param payment Value that should be paid
     * @param paymentReceiver Address that should receive the payment (or 0 if tx.origin)
     */
    function setup(
        address[] calldata _owners,
        uint256 _threshold,
        address to,
        bytes calldata data,
        address fallbackHandler,
        address paymentToken,
        uint256 payment,
        address payable paymentReceiver
    ) external {
        // setupOwners checks if the Threshold is already set, therefore preventing that this method is called twice
        setupOwners(_owners, _threshold);
        if (fallbackHandler != address(0)) internalSetFallbackHandler(fallbackHandler);
        // As setupOwners can only be called if the contract has not been initialized we don't need a check for setupModules
        setupModules(to, data);

        if (payment > 0) {
            // To avoid running into issues with EIP-170 we reuse the handlePayment function (to avoid adjusting code of that has been verified we do not adjust the method itself)
            // baseGas = 0, gasPrice = 1 and gas = payment => amount = (payment + 0) * 1 = payment
            handlePayment(payment, 0, 1, paymentToken, paymentReceiver);
        }
        emit SafeSetup(msg.sender, _owners, _threshold, to, fallbackHandler);
    }

    /** @notice Executes a `operation` {0: Call, 1: DelegateCall}} transaction to `to` with `value` (Native Currency)
     *          and pays `gasPrice` * `gasLimit` in `gasToken` token to `refundReceiver`.
     * @dev The fees are always transferred, even if the user transaction fails.
     *      This method doesn't perform any sanity check of the transaction, such as:
     *      - if the contract at `to` address has code or not
     *      - if the `gasToken` is a contract or not
     *      It is the responsibility of the caller to perform such checks.
     * @param to Destination address of Safe transaction.
     * @param value Ether value of Safe transaction.
     * @param data Data payload of Safe transaction.
     * @param operation Operation type of Safe transaction.
     * @param safeTxGas Gas that should be used for the Safe transaction.
     * @param baseGas Gas costs that are independent of the transaction execution(e.g. base transaction fee, signature check, payment of the refund)
     * @param gasPrice Gas price that should be used for the payment calculation.
     * @param gasToken Token address (or 0 if ETH) that is used for the payment.
     * @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
     * @param signatures Signature data that should be verified.
     *                   Can be packed ECDSA signature ({bytes32 r}{bytes32 s}{uint8 v}), contract signature (EIP-1271) or approved hash.
     * @return success Boolean indicating transaction's success.
     */
    function execTransaction(
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation,
        uint256 safeTxGas,
        uint256 baseGas,
        uint256 gasPrice,
        address gasToken,
        address payable refundReceiver,
        bytes memory signatures
    ) public payable virtual returns (bool success) {
        bytes32 txHash;
        // Use scope here to limit variable lifetime and prevent `stack too deep` errors
        {
            bytes memory txHashData = encodeTransactionData(
                // Transaction info
                to,
                value,
                data,
                operation,
                safeTxGas,
                // Payment info
                baseGas,
                gasPrice,
                gasToken,
                refundReceiver,
                // Signature info
                nonce
            );
            // Increase nonce and execute transaction.
            nonce++;
            txHash = keccak256(txHashData);
            checkSignatures(txHash, txHashData, signatures);
        }
        address guard = getGuard();
        {
            if (guard != address(0)) {
                Guard(guard).checkTransaction(
                    // Transaction info
                    to,
                    value,
                    data,
                    operation,
                    safeTxGas,
                    // Payment info
                    baseGas,
                    gasPrice,
                    gasToken,
                    refundReceiver,
                    // Signature info
                    signatures,
                    msg.sender
                );
            }
        }
        // We require some gas to emit the events (at least 2500) after the execution and some to perform code until the execution (500)
        // We also include the 1/64 in the check that is not send along with a call to counteract potential shortings because of EIP-150
        require(gasleft() >= ((safeTxGas * 64) / 63).max(safeTxGas + 2500) + 500, "GS010");
        // Use scope here to limit variable lifetime and prevent `stack too deep` errors
        {
            uint256 gasUsed = gasleft();
            // If the gasPrice is 0 we assume that nearly all available gas can be used (it is always more than safeTxGas)
            // We only substract 2500 (compared to the 3000 before) to ensure that the amount passed is still higher than safeTxGas
            success = execute(to, value, data, operation, gasPrice == 0 ? (gasleft() - 2500) : safeTxGas);
            gasUsed = gasUsed.sub(gasleft());
            // If no safeTxGas and no gasPrice was set (e.g. both are 0), then the internal tx is required to be successful
            // This makes it possible to use `estimateGas` without issues, as it searches for the minimum gas where the tx doesn't revert
            require(success || safeTxGas != 0 || gasPrice != 0, "GS013");
            // We transfer the calculated tx costs to the tx.origin to avoid sending it to intermediate contracts that have made calls
            uint256 payment = 0;
            if (gasPrice > 0) {
                payment = handlePayment(gasUsed, baseGas, gasPrice, gasToken, refundReceiver);
            }
            if (success) emit ExecutionSuccess(txHash, payment);
            else emit ExecutionFailure(txHash, payment);
        }
        {
            if (guard != address(0)) {
                Guard(guard).checkAfterExecution(txHash, success);
            }
        }
    }

    /**
     * @notice Handles the payment for a Safe transaction.
     * @param gasUsed Gas used by the Safe transaction.
     * @param baseGas Gas costs that are independent of the transaction execution (e.g. base transaction fee, signature check, payment of the refund).
     * @param gasPrice Gas price that should be used for the payment calculation.
     * @param gasToken Token address (or 0 if ETH) that is used for the payment.
     * @return payment The amount of payment made in the specified token.
     */
    function handlePayment(
        uint256 gasUsed,
        uint256 baseGas,
        uint256 gasPrice,
        address gasToken,
        address payable refundReceiver
    ) private returns (uint256 payment) {
        // solhint-disable-next-line avoid-tx-origin
        address payable receiver = refundReceiver == address(0) ? payable(tx.origin) : refundReceiver;
        if (gasToken == address(0)) {
            // For ETH we will only adjust the gas price to not be higher than the actual used gas price
            payment = gasUsed.add(baseGas).mul(gasPrice < tx.gasprice ? gasPrice : tx.gasprice);
            require(receiver.send(payment), "GS011");
        } else {
            payment = gasUsed.add(baseGas).mul(gasPrice);
            require(transferToken(gasToken, receiver, payment), "GS012");
        }
    }

    /**
     * @notice Checks whether the signature provided is valid for the provided data and hash. Reverts otherwise.
     * @param dataHash Hash of the data (could be either a message hash or transaction hash)
     * @param data That should be signed (this is passed to an external validator contract)
     * @param signatures Signature data that should be verified.
     *                   Can be packed ECDSA signature ({bytes32 r}{bytes32 s}{uint8 v}), contract signature (EIP-1271) or approved hash.
     */
    function checkSignatures(bytes32 dataHash, bytes memory data, bytes memory signatures) public view {
        // Load threshold to avoid multiple storage loads
        uint256 _threshold = threshold;
        // Check that a threshold is set
        require(_threshold > 0, "GS001");
        checkNSignatures(dataHash, data, signatures, _threshold);
    }

    /**
     * @notice Checks whether the signature provided is valid for the provided data and hash. Reverts otherwise.
     * @dev Since the EIP-1271 does an external call, be mindful of reentrancy attacks.
     * @param dataHash Hash of the data (could be either a message hash or transaction hash)
     * @param data That should be signed (this is passed to an external validator contract)
     * @param signatures Signature data that should be verified.
     *                   Can be packed ECDSA signature ({bytes32 r}{bytes32 s}{uint8 v}), contract signature (EIP-1271) or approved hash.
     * @param requiredSignatures Amount of required valid signatures.
     */
    function checkNSignatures(bytes32 dataHash, bytes memory data, bytes memory signatures, uint256 requiredSignatures) public view {
        // Check that the provided signature data is not too short
        require(signatures.length >= requiredSignatures.mul(65), "GS020");
        // There cannot be an owner with address 0.
        address lastOwner = address(0);
        address currentOwner;
        uint8 v;
        bytes32 r;
        bytes32 s;
        uint256 i;
        for (i = 0; i < requiredSignatures; i++) {
            (v, r, s) = signatureSplit(signatures, i);
            if (v == 0) {
                require(keccak256(data) == dataHash, "GS027");
                // If v is 0 then it is a contract signature
                // When handling contract signatures the address of the contract is encoded into r
                currentOwner = address(uint160(uint256(r)));

                // Check that signature data pointer (s) is not pointing inside the static part of the signatures bytes
                // This check is not completely accurate, since it is possible that more signatures than the threshold are send.
                // Here we only check that the pointer is not pointing inside the part that is being processed
                require(uint256(s) >= requiredSignatures.mul(65), "GS021");

                // Check that signature data pointer (s) is in bounds (points to the length of data -> 32 bytes)
                require(uint256(s).add(32) <= signatures.length, "GS022");

                // Check if the contract signature is in bounds: start of data is s + 32 and end is start + signature length
                uint256 contractSignatureLen;
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    contractSignatureLen := mload(add(add(signatures, s), 0x20))
                }
                require(uint256(s).add(32).add(contractSignatureLen) <= signatures.length, "GS023");

                // Check signature
                bytes memory contractSignature;
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    // The signature data for contract signatures is appended to the concatenated signatures and the offset is stored in s
                    contractSignature := add(add(signatures, s), 0x20)
                }
                require(ISignatureValidator(currentOwner).isValidSignature(data, contractSignature) == EIP1271_MAGIC_VALUE, "GS024");
            } else if (v == 1) {
                // If v is 1 then it is an approved hash
                // When handling approved hashes the address of the approver is encoded into r
                currentOwner = address(uint160(uint256(r)));
                // Hashes are automatically approved by the sender of the message or when they have been pre-approved via a separate transaction
                require(msg.sender == currentOwner || approvedHashes[currentOwner][dataHash] != 0, "GS025");
            } else if (v > 30) {
                // If v > 30 then default va (27,28) has been adjusted for eth_sign flow
                // To support eth_sign and similar we adjust v and hash the messageHash with the Ethereum message prefix before applying ecrecover
                currentOwner = ecrecover(keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", dataHash)), v - 4, r, s);
            } else {
                // Default is the ecrecover flow with the provided data hash
                // Use ecrecover with the messageHash for EOA signatures
                currentOwner = ecrecover(dataHash, v, r, s);
            }
            require(currentOwner > lastOwner && owners[currentOwner] != address(0) && currentOwner != SENTINEL_OWNERS, "GS026");
            lastOwner = currentOwner;
        }
    }

    /**
     * @notice Marks hash `hashToApprove` as approved.
     * @dev This can be used with a pre-approved hash transaction signature.
     *      IMPORTANT: The approved hash stays approved forever. There's no revocation mechanism, so it behaves similarly to ECDSA signatures
     * @param hashToApprove The hash to mark as approved for signatures that are verified by this contract.
     */
    function approveHash(bytes32 hashToApprove) external {
        require(owners[msg.sender] != address(0), "GS030");
        approvedHashes[msg.sender][hashToApprove] = 1;
        emit ApproveHash(hashToApprove, msg.sender);
    }

    /**
     * @notice Returns the ID of the chain the contract is currently deployed on.
     * @return The ID of the current chain as a uint256.
     */
    function getChainId() public view returns (uint256) {
        uint256 id;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            id := chainid()
        }
        return id;
    }

    /**
     * @dev Returns the domain separator for this contract, as defined in the EIP-712 standard.
     * @return bytes32 The domain separator hash.
     */
    function domainSeparator() public view returns (bytes32) {
        return keccak256(abi.encode(DOMAIN_SEPARATOR_TYPEHASH, getChainId(), this));
    }

    /**
     * @notice Returns the pre-image of the transaction hash (see getTransactionHash).
     * @param to Destination address.
     * @param value Ether value.
     * @param data Data payload.
     * @param operation Operation type.
     * @param safeTxGas Gas that should be used for the safe transaction.
     * @param baseGas Gas costs for that are independent of the transaction execution(e.g. base transaction fee, signature check, payment of the refund)
     * @param gasPrice Maximum gas price that should be used for this transaction.
     * @param gasToken Token address (or 0 if ETH) that is used for the payment.
     * @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
     * @param _nonce Transaction nonce.
     * @return Transaction hash bytes.
     */
    function encodeTransactionData(
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation,
        uint256 safeTxGas,
        uint256 baseGas,
        uint256 gasPrice,
        address gasToken,
        address refundReceiver,
        uint256 _nonce
    ) public view returns (bytes memory) {
        bytes32 safeTxHash = keccak256(
            abi.encode(
                SAFE_TX_TYPEHASH,
                to,
                value,
                keccak256(data),
                operation,
                safeTxGas,
                baseGas,
                gasPrice,
                gasToken,
                refundReceiver,
                _nonce
            )
        );
        return abi.encodePacked(bytes1(0x19), bytes1(0x01), domainSeparator(), safeTxHash);
    }

    /**
     * @notice Returns transaction hash to be signed by owners.
     * @param to Destination address.
     * @param value Ether value.
     * @param data Data payload.
     * @param operation Operation type.
     * @param safeTxGas Fas that should be used for the safe transaction.
     * @param baseGas Gas costs for data used to trigger the safe transaction.
     * @param gasPrice Maximum gas price that should be used for this transaction.
     * @param gasToken Token address (or 0 if ETH) that is used for the payment.
     * @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
     * @param _nonce Transaction nonce.
     * @return Transaction hash.
     */
    function getTransactionHash(
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation,
        uint256 safeTxGas,
        uint256 baseGas,
        uint256 gasPrice,
        address gasToken,
        address refundReceiver,
        uint256 _nonce
    ) public view returns (bytes32) {
        return keccak256(encodeTransactionData(to, value, data, operation, safeTxGas, baseGas, gasPrice, gasToken, refundReceiver, _nonce));
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/**
 * @title SafeMath
 * @notice Math operations with safety checks that revert on error (overflow/underflow)
 */
library SafeMath {
    /**
     * @notice Multiplies two numbers, reverts on overflow.
     * @param a First number
     * @param b Second number
     * @return Product of a and b
     */
    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-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    /**
     * @notice Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     * @param a First number
     * @param b Second number
     * @return Difference of a and b
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
     * @notice Adds two numbers, reverts on overflow.
     * @param a First number
     * @param b Second number
     * @return Sum of a and b
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
     * @notice Returns the largest of two numbers.
     * @param a First number
     * @param b Second number
     * @return Largest of a and b
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/**
 * @title SecuredTokenTransfer - Secure token transfer.
 * @author Richard Meissner - @rmeissner
 */
abstract contract SecuredTokenTransfer {
    /**
     * @notice Transfers a token and returns a boolean if it was a success
     * @dev It checks the return data of the transfer call and returns true if the transfer was successful.
     *      It doesn't check if the `token` address is a contract or not.
     * @param token Token that should be transferred
     * @param receiver Receiver to whom the token should be transferred
     * @param amount The amount of tokens that should be transferred
     * @return transferred Returns true if the transfer was successful
     */
    function transferToken(address token, address receiver, uint256 amount) internal returns (bool transferred) {
        // 0xa9059cbb - keccack("transfer(address,uint256)")
        bytes memory data = abi.encodeWithSelector(0xa9059cbb, receiver, amount);
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // We write the return value to scratch space.
            // See https://docs.soliditylang.org/en/v0.7.6/internals/layout_in_memory.html#layout-in-memory
            let success := call(sub(gas(), 10000), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            switch returndatasize()
            case 0 {
                transferred := success
            }
            case 0x20 {
                transferred := iszero(or(iszero(success), iszero(mload(0))))
            }
            default {
                transferred := 0
            }
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/**
 * @title SelfAuthorized - Authorizes current contract to perform actions to itself.
 * @author Richard Meissner - @rmeissner
 */
abstract contract SelfAuthorized {
    function requireSelfCall() private view {
        require(msg.sender == address(this), "GS031");
    }

    modifier authorized() {
        // Modifiers are copied around during compilation. This is a function call as it minimized the bytecode size
        requireSelfCall();
        _;
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/**
 * @title SignatureDecoder - Decodes signatures encoded as bytes
 * @author Richard Meissner - @rmeissner
 */
abstract contract SignatureDecoder {
    /**
     * @notice Splits signature bytes into `uint8 v, bytes32 r, bytes32 s`.
     * @dev Make sure to perform a bounds check for @param pos, to avoid out of bounds access on @param signatures
     *      The signature format is a compact form of {bytes32 r}{bytes32 s}{uint8 v}
     *      Compact means uint8 is not padded to 32 bytes.
     * @param pos Which signature to read.
     *            A prior bounds check of this parameter should be performed, to avoid out of bounds access.
     * @param signatures Concatenated {r, s, v} signatures.
     * @return v Recovery ID or Safe signature type.
     * @return r Output value r of the signature.
     * @return s Output value s of the signature.
     */
    function signatureSplit(bytes memory signatures, uint256 pos) internal pure returns (uint8 v, bytes32 r, bytes32 s) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let signaturePos := mul(0x41, pos)
            r := mload(add(signatures, add(signaturePos, 0x20)))
            s := mload(add(signatures, add(signaturePos, 0x40)))
            /**
             * Here we are loading the last 32 bytes, including 31 bytes
             * of 's'. There is no 'mload8' to do this.
             * 'byte' is not working due to the Solidity parser, so lets
             * use the second best option, 'and'
             */
            v := and(mload(add(signatures, add(signaturePos, 0x41))), 0xff)
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

import "./Base.sol";
import "../../interfaces/ISignatureValidator.sol";

interface ERC1271 {
    function isValidSignature(bytes32 hash, bytes calldata signature) external view returns (bytes4 magicValue);
}

/**
 * @title Safe Signature Verifier Interface
 * @author mfw78 <mfw78@rndlabs.xyz>
 * @notice This interface provides an standard for external contracts that are verifying signatures
 *         for a Safe.
 */
interface ISafeSignatureVerifier {
    /**
     * @dev If called by `SignatureVerifierMuxer`, the following has already been checked:
     *      _hash = h(abi.encodePacked("\x19\x01", domainSeparator, h(typeHash || encodeData)));
     * @param safe The Safe that has delegated the signature verification
     * @param sender The address that originally called the Safe's `isValidSignature` method
     * @param _hash The EIP-712 hash whose signature will be verified
     * @param domainSeparator The EIP-712 domainSeparator
     * @param typeHash The EIP-712 typeHash
     * @param encodeData The EIP-712 encoded data
     * @param payload An arbitrary payload that can be used to pass additional data to the verifier
     * @return magic The magic value that should be returned if the signature is valid (0x1626ba7e)
     */
    function isValidSafeSignature(
        Safe safe,
        address sender,
        bytes32 _hash,
        bytes32 domainSeparator,
        bytes32 typeHash,
        bytes calldata encodeData,
        bytes calldata payload
    ) external view returns (bytes4 magic);
}

interface ISignatureVerifierMuxer {
    function domainVerifiers(Safe safe, bytes32 domainSeparator) external view returns (ISafeSignatureVerifier);

    function setDomainVerifier(bytes32 domainSeparator, ISafeSignatureVerifier verifier) external;
}

/**
 * @title ERC-1271 Signature Verifier Multiplexer (Muxer)
 * @author mfw78 <mfw78@rndlabs.xyz>
 * @notice Allows delegating EIP-712 domains to an arbitray `ISafeSignatureVerifier`
 * @dev This multiplexer enforces a strict authorisation per domainSeparator. This is to prevent a malicious
 *     `ISafeSignatureVerifier` from being able to verify signatures for any domainSeparator. This does not prevent
 *      an `ISafeSignatureVerifier` from being able to verify signatures for multiple domainSeparators, however
 *      each domainSeparator requires specific approval by Safe.
 */
abstract contract SignatureVerifierMuxer is ExtensibleBase, ERC1271, ISignatureVerifierMuxer {
    // --- constants ---
    // keccak256("SafeMessage(bytes message)");
    bytes32 private constant SAFE_MSG_TYPEHASH = 0x60b3cbf8b4a223d68d641b3b6ddf9a298e7f33710cf3d3a9d1146b5a6150fbca;
    // keccak256("safeSignature(bytes32,bytes32,bytes,bytes)");
    bytes4 private constant SAFE_SIGNATURE_MAGIC_VALUE = 0x5fd7e97d;

    // --- storage ---
    mapping(Safe => mapping(bytes32 => ISafeSignatureVerifier)) public override domainVerifiers;

    // --- events ---
    event AddedDomainVerifier(Safe indexed safe, bytes32 domainSeparator, ISafeSignatureVerifier verifier);
    event ChangedDomainVerifier(
        Safe indexed safe,
        bytes32 domainSeparator,
        ISafeSignatureVerifier oldVerifier,
        ISafeSignatureVerifier newVerifier
    );
    event RemovedDomainVerifier(Safe indexed safe, bytes32 domainSeparator);

    /**
     * Setter for the signature muxer
     * @param domainSeparator The domainSeparator authorised for the `ISafeSignatureVerifier`
     * @param newVerifier A contract that implements `ISafeSignatureVerifier`
     */
    function setDomainVerifier(bytes32 domainSeparator, ISafeSignatureVerifier newVerifier) public override onlySelf {
        Safe safe = Safe(payable(_msgSender()));
        ISafeSignatureVerifier oldVerifier = domainVerifiers[safe][domainSeparator];
        if (address(newVerifier) == address(0) && address(oldVerifier) != address(0)) {
            delete domainVerifiers[safe][domainSeparator];
            emit RemovedDomainVerifier(safe, domainSeparator);
        } else {
            domainVerifiers[safe][domainSeparator] = newVerifier;
            if (address(oldVerifier) == address(0)) {
                emit AddedDomainVerifier(safe, domainSeparator, newVerifier);
            } else {
                emit ChangedDomainVerifier(safe, domainSeparator, oldVerifier, newVerifier);
            }
        }
    }

    /**
     * @notice Implements ERC1271 interface for smart contract EIP-712 signature validation
     * @dev The signature format is the same as the one used by the Safe contract
     * @param _hash Hash of the data that is signed
     * @param signature The signature to be verified
     * @return magic Standardised ERC1271 return value
     */
    function isValidSignature(bytes32 _hash, bytes calldata signature) external view override returns (bytes4 magic) {
        (Safe safe, address sender) = _getContext();

        // Check if the signature is for an `ISafeSignatureVerifier` and if it is valid for the domain.
        if (signature.length >= 4) {
            bytes4 sigSelector;
            // solhint-disable-next-line no-inline-assembly
            assembly {
                sigSelector := shl(224, shr(224, calldataload(signature.offset)))
            }

            // Guard against short signatures that would cause abi.decode to revert.
            if (sigSelector == SAFE_SIGNATURE_MAGIC_VALUE && signature.length >= 68) {
                // Signature is for an `ISafeSignatureVerifier` - decode the signature.
                // Layout of the `signature`:
                // 0x00 - 0x04: selector
                // 0x04 - 0x36: domainSeparator
                // 0x36 - 0x68: typeHash
                // 0x68 - 0x6C: encodeData length
                // 0x6C - 0x6C + encodeData length: encodeData
                // 0x6C + encodeData length - 0x6C + encodeData length + 0x20: payload length
                // 0x6C + encodeData length + 0x20 - end: payload
                //
                // Get the domainSeparator from the signature.
                (bytes32 domainSeparator, bytes32 typeHash) = abi.decode(signature[4:68], (bytes32, bytes32));

                ISafeSignatureVerifier verifier = domainVerifiers[safe][domainSeparator];
                // Check if there is an `ISafeSignatureVerifier` for the domain.
                if (address(verifier) != address(0)) {
                    (, , bytes memory encodeData, bytes memory payload) = abi.decode(signature[4:], (bytes32, bytes32, bytes, bytes));

                    // Check that the signature is valid for the domain.
                    if (keccak256(EIP712.encodeMessageData(domainSeparator, typeHash, encodeData)) == _hash) {
                        // Preserving the context, call the Safe's authorised `ISafeSignatureVerifier` to verify.
                        return verifier.isValidSafeSignature(safe, sender, _hash, domainSeparator, typeHash, encodeData, payload);
                    }
                }
            }
        }

        // domainVerifier doesn't exist or the signature is invalid for the domain - fall back to the default
        return defaultIsValidSignature(safe, _hash, signature);
    }

    /**
     * Default Safe signature validation (approved hashes / threshold signatures)
     * @param safe The safe being asked to validate the signature
     * @param _hash Hash of the data that is signed
     * @param signature The signature to be verified
     */
    function defaultIsValidSignature(Safe safe, bytes32 _hash, bytes memory signature) internal view returns (bytes4 magic) {
        bytes memory messageData = EIP712.encodeMessageData(
            safe.domainSeparator(),
            SAFE_MSG_TYPEHASH,
            abi.encode(keccak256(abi.encode(_hash)))
        );
        bytes32 messageHash = keccak256(messageData);
        if (signature.length == 0) {
            // approved hashes
            require(safe.signedMessages(messageHash) != 0, "Hash not approved");
        } else {
            // threshold signatures
            safe.checkSignatures(messageHash, messageData, signature);
        }
        magic = ERC1271.isValidSignature.selector;
    }
}

library EIP712 {
    function encodeMessageData(bytes32 domainSeparator, bytes32 typeHash, bytes memory message) internal pure returns (bytes memory) {
        return abi.encodePacked(bytes1(0x19), bytes1(0x01), domainSeparator, keccak256(abi.encodePacked(typeHash, message)));
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Singleton - Base for singleton contracts (should always be the first super contract)
 *        This contract is tightly coupled to our proxy contract (see `proxies/SafeProxy.sol`)
 * @author Richard Meissner - @rmeissner
 */
abstract contract Singleton {
    // singleton always has to be the first declared variable to ensure the same location as in the Proxy contract.
    // It should also always be ensured the address is stored alone (uses a full word)
    address private singleton;
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/**
 * @title StorageAccessible - A generic base contract that allows callers to access all internal storage.
 * @notice See https://github.com/gnosis/util-contracts/blob/bb5fe5fb5df6d8400998094fb1b32a178a47c3a1/contracts/StorageAccessible.sol
 *         It removes a method from the original contract not needed for the Safe contracts.
 * @author Gnosis Developers
 */
abstract contract StorageAccessible {
    /**
     * @notice Reads `length` bytes of storage in the currents contract
     * @param offset - the offset in the current contract's storage in words to start reading from
     * @param length - the number of words (32 bytes) of data to read
     * @return the bytes that were read.
     */
    function getStorageAt(uint256 offset, uint256 length) public view returns (bytes memory) {
        bytes memory result = new bytes(length * 32);
        for (uint256 index = 0; index < length; index++) {
            // solhint-disable-next-line no-inline-assembly
            assembly {
                let word := sload(add(offset, index))
                mstore(add(add(result, 0x20), mul(index, 0x20)), word)
            }
        }
        return result;
    }

    /**
     * @dev Performs a delegatecall on a targetContract in the context of self.
     * Internally reverts execution to avoid side effects (making it static).
     *
     * This method reverts with data equal to `abi.encode(bool(success), bytes(response))`.
     * Specifically, the `returndata` after a call to this method will be:
     * `success:bool || response.length:uint256 || response:bytes`.
     *
     * @param targetContract Address of the contract containing the code to execute.
     * @param calldataPayload Calldata that should be sent to the target contract (encoded method name and arguments).
     */
    function simulateAndRevert(address targetContract, bytes memory calldataPayload) external {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let success := delegatecall(gas(), targetContract, add(calldataPayload, 0x20), mload(calldataPayload), 0, 0)

            mstore(0x00, success)
            mstore(0x20, returndatasize())
            returndatacopy(0x40, 0, returndatasize())
            revert(0, add(returndatasize(), 0x40))
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

import "../../interfaces/ERC1155TokenReceiver.sol";
import "../../interfaces/ERC721TokenReceiver.sol";

import "./Base.sol";

/**
 * @title TokenCallbacks - ERC1155 and ERC721 token callbacks for Safes
 * @author mfw78 <mfw78@rndlabs.xyz>
 * @notice Refactored from https://github.com/safe-global/safe-contracts/blob/3c3fc80f7f9aef1d39aaae2b53db5f4490051b0d/contracts/handler/TokenCallbackHandler.sol
 */
abstract contract TokenCallbacks is ExtensibleBase, ERC1155TokenReceiver, ERC721TokenReceiver {
    /**
     * @notice Handles ERC1155 Token callback.
     * return Standardized onERC1155Received return value.
     */
    function onERC1155Received(address, address, uint256, uint256, bytes calldata) external pure override returns (bytes4) {
        // Else return the standard value
        return 0xf23a6e61;
    }

    /**
     * @notice Handles ERC1155 Token batch callback.
     * return Standardized onERC1155BatchReceived return value.
     */
    function onERC1155BatchReceived(
        address,
        address,
        uint256[] calldata,
        uint256[] calldata,
        bytes calldata
    ) external pure override returns (bytes4) {
        // Else return the standard value
        return 0xbc197c81;
    }

    /**
     * @notice Handles ERC721 Token callback.
     *  return Standardized onERC721Received return value.
     */
    function onERC721Received(address, address, uint256, bytes calldata) external pure override returns (bytes4) {
        // Else return the standard value
        return 0x150b7a02;
    }
}

{
  "compilationTarget": {
    "lib/safe/contracts/handler/ExtensibleFallbackHandler.sol": "ExtensibleFallbackHandler"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 20000
  },
  "remappings": [
    ":@openzeppelin/=lib/@openzeppelin/contracts/",
    ":@openzeppelin/contracts/=lib/@openzeppelin/contracts/",
    ":balancer/=lib/balancer/src/",
    ":canonical-weth/=lib/canonical-weth/src/",
    ":cowprotocol/=lib/cowprotocol/src/contracts/",
    ":ds-test/=lib/forge-std/lib/ds-test/src/",
    ":erc4626-tests/=lib/@openzeppelin/lib/erc4626-tests/",
    ":forge-std/=lib/forge-std/src/",
    ":helpers/=lib/balancer/src/lib/helpers/",
    ":math/=lib/balancer/src/lib/math/",
    ":murky/=lib/murky/src/",
    ":openzeppelin-contracts/=lib/murky/lib/openzeppelin-contracts/",
    ":openzeppelin/=lib/@openzeppelin/contracts/",
    ":safe/=lib/safe/contracts/"
  ]
}