// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.8.17 <0.9.0;

import "./Types.sol";

contract MultiSendUnwrapper is ITransactionUnwrapper {
    uint256 private constant OFFSET_START = 68;

    error UnsupportedMode();
    error MalformedHeader();
    error MalformedBody();

    function unwrap(
        address,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation
    ) external pure returns (UnwrappedTransaction[] memory) {
        if (value != 0) {
            revert UnsupportedMode();
        }
        if (operation != Enum.Operation.DelegateCall) {
            revert UnsupportedMode();
        }
        _validateHeader(data);
        uint256 count = _validateEntries(data);
        return _unwrapEntries(data, count);
    }

    function _validateHeader(bytes calldata data) private pure {
        // first 4 bytes are the selector for multiSend(bytes)
        if (bytes4(data) != IMultiSend.multiSend.selector) {
            revert MalformedHeader();
        }

        // the following 32 bytes are the offset to the bytes param
        // (always 0x20)
        if (bytes32(data[4:]) != bytes32(uint256(0x20))) {
            revert MalformedHeader();
        }

        // the following 32 bytes are the length of the bytes param
        uint256 length = uint256(bytes32(data[36:]));

        // validate that the total calldata length matches
        // it's the 4 + 32 + 32 bytes checked above + the <length> bytes
        // padded to a multiple of 32
        if (4 + _ceil32(32 + 32 + length) != data.length) {
            revert MalformedHeader();
        }
    }

    function _validateEntries(
        bytes calldata data
    ) private pure returns (uint256 count) {
        uint256 offset = OFFSET_START;

        // data is padded to 32 bytes we can't simply do offset < data.length
        for (; offset + 32 < data.length; ) {
            // Per transaction:
            // Operation   1  bytes
            // To          20 bytes
            // Value       32 bytes
            // Length      32 bytes
            // Data        Length bytes
            uint8 operation = uint8(bytes1(data[offset:]));
            if (operation > 1) {
                revert MalformedBody();
            }

            uint256 length = uint256(bytes32(data[offset + 53:]));
            if (offset + 85 + length > data.length) {
                revert MalformedBody();
            }

            offset += 85 + length;
            count++;
        }

        if (count == 0) {
            revert MalformedBody();
        }
    }

    function _unwrapEntries(
        bytes calldata data,
        uint256 count
    ) private pure returns (UnwrappedTransaction[] memory result) {
        result = new UnwrappedTransaction[](count);

        uint256 offset = OFFSET_START;
        for (uint256 i; i < count; ) {
            result[i].operation = Enum.Operation(uint8(bytes1(data[offset:])));
            offset += 1;

            result[i].to = address(bytes20(data[offset:]));
            offset += 20;

            result[i].value = uint256(bytes32(data[offset:]));
            offset += 32;

            uint256 size = uint256(bytes32(data[offset:]));
            offset += 32;

            result[i].dataLocation = offset;
            result[i].dataSize = size;
            offset += size;

            unchecked {
                ++i;
            }
        }
    }

    function _ceil32(uint256 length) private pure returns (uint256) {
        // pad size. Source: http://www.cs.nott.ac.uk/~psarb2/G51MPC/slides/NumberLogic.pdf
        return ((length + 32 - 1) / 32) * 32;
    }
}

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

/// @title Enum - Collection of enums
/// @author Richard Meissner - <[email protected]>
contract Enum {
    enum Operation {Call, DelegateCall}
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.8.17 <0.9.0;

import "@gnosis.pm/safe-contracts/contracts/common/Enum.sol";

interface IMultiSend {
    function multiSend(bytes memory transactions) external payable;
}

struct UnwrappedTransaction {
    Enum.Operation operation;
    address to;
    uint256 value;
    // We wanna deal in calldata slices. We return location, let invoker slice
    uint256 dataLocation;
    uint256 dataSize;
}

interface ITransactionUnwrapper {
    function unwrap(
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation
    ) external view returns (UnwrappedTransaction[] memory result);
}

interface ICustomCondition {
    function check(
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation,
        uint256 location,
        uint256 size,
        bytes12 extra
    ) external view returns (bool success, bytes32 reason);
}

{
  "evmVersion": "shanghai",
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"name":"MalformedBody","type":"error"},{"inputs":[],"name":"MalformedHeader","type":"error"},{"inputs":[],"name":"UnsupportedMode","type":"error"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"enum Enum.Operation","name":"operation","type":"uint8"}],"name":"unwrap","outputs":[{"components":[{"internalType":"enum Enum.Operation","name":"operation","type":"uint8"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"dataLocation","type":"uint256"},{"internalType":"uint256","name":"dataSize","type":"uint256"}],"internalType":"struct UnwrappedTransaction[]","name":"","type":"tuple[]"}],"stateMutability":"pure","type":"function"}]

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