Contract Library is the blockchain sleuth's favorite tool chest, allowing developers to easily debug, monitor, query, and analyze any deployed smart contract and its actions.

Contract Library by Dedaub

owner

owner_

_newOwner

transferOwnership

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

/// @title ERC-173 Contract Ownership Standard
///  Note: the ERC-165 identifier for this interface is 0x7f5828d0
/* is ERC165 */
interface IERC173 {
    /// @dev This emits when ownership of a contract changes.
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /// @notice Get the address of the owner
    /// @return owner_ The address of the owner.
    function owner() external view returns (address owner_);

    /// @notice Set the address of the new owner of the contract
    /// @dev Set _newOwner to address(0) to renounce any ownership.
    /// @param _newOwner The address of the new owner of the contract
    function transferOwnership(address _newOwner) external;
}


src/interfaces/IERC173.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

/******************************************************************************\
* Author: Nick Mudge <nick@perfectabstractions.com> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

interface IDiamond {
    enum FacetCutAction {
        Add,
        Replace,
        Remove
    }
    // Add=0, Replace=1, Remove=2

    struct FacetCut {
        address facetAddress;
        FacetCutAction action;
        bytes4[] functionSelectors;
    }

    event DiamondCut(FacetCut[] _diamondCut, address _init, bytes _calldata);
}


src/interfaces/IDiamond.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

/******************************************************************************\
* Author: Nick Mudge <nick@perfectabstractions.com> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/
import {IDiamond} from "../interfaces/IDiamond.sol";
import {IDiamondCut} from "../interfaces/IDiamondCut.sol";

// Remember to add the loupe functions from DiamondLoupeFacet to the diamond.
// The loupe functions are required by the EIP2535 Diamonds standard

error NoSelectorsGivenToAdd();
error NotContractOwner(address _user, address _contractOwner);
error NoSelectorsProvidedForFacetForCut(address _facetAddress);
error CannotAddSelectorsToZeroAddress(bytes4[] _selectors);
error NoBytecodeAtAddress(address _contractAddress, string _message);
error IncorrectFacetCutAction(uint8 _action);
error CannotAddFunctionToDiamondThatAlreadyExists(bytes4 _selector);
error CannotReplaceFunctionsFromFacetWithZeroAddress(bytes4[] _selectors);
error CannotReplaceImmutableFunction(bytes4 _selector);
error CannotReplaceFunctionWithTheSameFunctionFromTheSameFacet(
    bytes4 _selector
);
error CannotReplaceFunctionThatDoesNotExists(bytes4 _selector);
error RemoveFacetAddressMustBeZeroAddress(address _facetAddress);
error CannotRemoveFunctionThatDoesNotExist(bytes4 _selector);
error CannotRemoveImmutableFunction(bytes4 _selector);
error InitializationFunctionReverted(
    address _initializationContractAddress,
    bytes _calldata
);

library LibDiamond {
    bytes32 constant DIAMOND_STORAGE_POSITION =
        keccak256("diamond.standard.diamond.storage");

    struct FacetAddressAndSelectorPosition {
        address facetAddress;
        uint16 selectorPosition;
    }

    struct DiamondStorage {
        // function selector => facet address and selector position in selectors array
        mapping(bytes4 => FacetAddressAndSelectorPosition) facetAddressAndSelectorPosition;
        bytes4[] selectors;
        mapping(bytes4 => bool) supportedInterfaces;
        // owner of the contract
        address contractOwner;
    }

    function diamondStorage()
        internal
        pure
        returns (DiamondStorage storage ds)
    {
        bytes32 position = DIAMOND_STORAGE_POSITION;
        assembly {
            ds.slot := position
        }
    }

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

    function setContractOwner(address _newOwner) internal {
        DiamondStorage storage ds = diamondStorage();
        address previousOwner = ds.contractOwner;
        ds.contractOwner = _newOwner;
        emit OwnershipTransferred(previousOwner, _newOwner);
    }

    function contractOwner() internal view returns (address contractOwner_) {
        contractOwner_ = diamondStorage().contractOwner;
    }

    function enforceIsContractOwner() internal view {
        if (msg.sender != diamondStorage().contractOwner) {
            revert NotContractOwner(msg.sender, diamondStorage().contractOwner);
        }
    }

    event DiamondCut(
        IDiamondCut.FacetCut[] _diamondCut,
        address _init,
        bytes _calldata
    );

    // Internal function version of diamondCut
    function diamondCut(
        IDiamondCut.FacetCut[] memory _diamondCut,
        address _init,
        bytes memory _calldata
    ) internal {
        for (
            uint256 facetIndex;
            facetIndex < _diamondCut.length;
            facetIndex++
        ) {
            bytes4[] memory functionSelectors = _diamondCut[facetIndex]
                .functionSelectors;
            address facetAddress = _diamondCut[facetIndex].facetAddress;
            if (functionSelectors.length == 0) {
                revert NoSelectorsProvidedForFacetForCut(facetAddress);
            }
            IDiamondCut.FacetCutAction action = _diamondCut[facetIndex].action;
            if (action == IDiamond.FacetCutAction.Add) {
                addFunctions(facetAddress, functionSelectors);
            } else if (action == IDiamond.FacetCutAction.Replace) {
                replaceFunctions(facetAddress, functionSelectors);
            } else if (action == IDiamond.FacetCutAction.Remove) {
                removeFunctions(facetAddress, functionSelectors);
            } else {
                revert IncorrectFacetCutAction(uint8(action));
            }
        }
        emit DiamondCut(_diamondCut, _init, _calldata);
        initializeDiamondCut(_init, _calldata);
    }

    function addFunctions(
        address _facetAddress,
        bytes4[] memory _functionSelectors
    ) internal {
        if (_facetAddress == address(0)) {
            revert CannotAddSelectorsToZeroAddress(_functionSelectors);
        }
        DiamondStorage storage ds = diamondStorage();
        uint16 selectorCount = uint16(ds.selectors.length);
        enforceHasContractCode(
            _facetAddress,
            "LibDiamondCut: Add facet has no code"
        );
        for (
            uint256 selectorIndex;
            selectorIndex < _functionSelectors.length;
            selectorIndex++
        ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = ds
                .facetAddressAndSelectorPosition[selector]
                .facetAddress;
            if (oldFacetAddress != address(0)) {
                revert CannotAddFunctionToDiamondThatAlreadyExists(selector);
            }
            ds.facetAddressAndSelectorPosition[
                selector
            ] = FacetAddressAndSelectorPosition(_facetAddress, selectorCount);
            ds.selectors.push(selector);
            selectorCount++;
        }
    }

    function replaceFunctions(
        address _facetAddress,
        bytes4[] memory _functionSelectors
    ) internal {
        DiamondStorage storage ds = diamondStorage();
        if (_facetAddress == address(0)) {
            revert CannotReplaceFunctionsFromFacetWithZeroAddress(
                _functionSelectors
            );
        }
        enforceHasContractCode(
            _facetAddress,
            "LibDiamondCut: Replace facet has no code"
        );
        for (
            uint256 selectorIndex;
            selectorIndex < _functionSelectors.length;
            selectorIndex++
        ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = ds
                .facetAddressAndSelectorPosition[selector]
                .facetAddress;
            // can't replace immutable functions -- functions defined directly in the diamond in this case
            if (oldFacetAddress == address(this)) {
                revert CannotReplaceImmutableFunction(selector);
            }
            if (oldFacetAddress == _facetAddress) {
                revert CannotReplaceFunctionWithTheSameFunctionFromTheSameFacet(
                    selector
                );
            }
            if (oldFacetAddress == address(0)) {
                revert CannotReplaceFunctionThatDoesNotExists(selector);
            }
            // replace old facet address
            ds
                .facetAddressAndSelectorPosition[selector]
                .facetAddress = _facetAddress;
        }
    }

    function removeFunctions(
        address _facetAddress,
        bytes4[] memory _functionSelectors
    ) internal {
        DiamondStorage storage ds = diamondStorage();
        uint256 selectorCount = ds.selectors.length;
        if (_facetAddress != address(0)) {
            revert RemoveFacetAddressMustBeZeroAddress(_facetAddress);
        }
        for (
            uint256 selectorIndex;
            selectorIndex < _functionSelectors.length;
            selectorIndex++
        ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            FacetAddressAndSelectorPosition
                memory oldFacetAddressAndSelectorPosition = ds
                    .facetAddressAndSelectorPosition[selector];
            if (oldFacetAddressAndSelectorPosition.facetAddress == address(0)) {
                revert CannotRemoveFunctionThatDoesNotExist(selector);
            }

            // can't remove immutable functions -- functions defined directly in the diamond
            if (
                oldFacetAddressAndSelectorPosition.facetAddress == address(this)
            ) {
                revert CannotRemoveImmutableFunction(selector);
            }
            // replace selector with last selector
            selectorCount--;
            if (
                oldFacetAddressAndSelectorPosition.selectorPosition !=
                selectorCount
            ) {
                bytes4 lastSelector = ds.selectors[selectorCount];
                ds.selectors[
                    oldFacetAddressAndSelectorPosition.selectorPosition
                ] = lastSelector;
                ds
                    .facetAddressAndSelectorPosition[lastSelector]
                    .selectorPosition = oldFacetAddressAndSelectorPosition
                    .selectorPosition;
            }
            // delete last selector
            ds.selectors.pop();
            delete ds.facetAddressAndSelectorPosition[selector];
        }
    }

    function initializeDiamondCut(
        address _init,
        bytes memory _calldata
    ) internal {
        if (_init == address(0)) {
            return;
        }
        enforceHasContractCode(
            _init,
            "LibDiamondCut: _init address has no code"
        );
        (bool success, bytes memory error) = _init.delegatecall(_calldata);
        if (!success) {
            if (error.length > 0) {
                // bubble up error
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(error)
                    revert(add(32, error), returndata_size)
                }
            } else {
                revert InitializationFunctionReverted(_init, _calldata);
            }
        }
    }

    function enforceHasContractCode(
        address _contract,
        string memory _errorMessage
    ) internal view {
        uint256 contractSize;
        assembly {
            contractSize := extcodesize(_contract)
        }
        if (contractSize == 0) {
            revert NoBytecodeAtAddress(_contract, _errorMessage);
        }
    }
}


src/libraries/LibDiamond.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { LibDiamond } from "../libraries/LibDiamond.sol";
import { IERC173 } from "../interfaces/IERC173.sol";

contract OwnershipFacet is IERC173 {
    function transferOwnership(address _newOwner) external override {
        LibDiamond.enforceIsContractOwner();
        LibDiamond.setContractOwner(_newOwner);
    }

    function owner() external override view returns (address owner_) {
        owner_ = LibDiamond.contractOwner();
    }
}


src/facets/OwnershipFacet.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

/******************************************************************************\
* Author: Nick Mudge <nick@perfectabstractions.com> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

import {IDiamond} from "./IDiamond.sol";

interface IDiamondCut is IDiamond {
    /// @notice Add/replace/remove any number of functions and optionally execute
    ///         a function with delegatecall
    /// @param _diamondCut Contains the facet addresses and function selectors
    /// @param _init The address of the contract or facet to execute _calldata
    /// @param _calldata A function call, including function selector and arguments
    ///                  _calldata is executed with delegatecall on _init
    function diamondCut(
        FacetCut[] calldata _diamondCut,
        address _init,
        bytes calldata _calldata
    ) external;
}


0x32692944d214863c50eBeB1c31C0AD2321Cd6851