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// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.10;

/******************************************************************************\
* A custom implementation of EIP-2535
* EIP-2535: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

import { CegaEntryLib } from "./lib/CegaEntryLib.sol";
import { ICegaEntry } from "./interfaces/ICegaEntry.sol";

contract CegaEntry is ICegaEntry {
    constructor(address _contractOwner) payable {
        CegaEntryLib.setContractOwner(_contractOwner);
    }

    function diamondCut(
        ProxyImplementation[] calldata _implementationParams,
        address _init,
        bytes calldata _calldata
    ) external override {
        CegaEntryLib.enforceIsContractOwner();
        CegaEntryLib.updateImplementation(
            _implementationParams,
            _init,
            _calldata
        );
    }

    // Find implementation for function that is called and execute the
    // function if a implementation is found and return any value.
    fallback() external payable {
        CegaEntryLib.ProxyStorage storage ds = CegaEntryLib.proxyStorage();

        // get implementation from function selector
        address implementation = ds
            .selectorToImplAndPosition[msg.sig]
            .implAddress;
        require(
            implementation != address(0),
            "CegaEntry: Function does not exist"
        );
        // Execute external function from implementation using delegatecall and return any value.
        assembly {
            // copy function selector and any arguments
            calldatacopy(0, 0, calldatasize())
            // execute function call using the implementation
            let result := delegatecall(
                gas(),
                implementation,
                0,
                calldatasize(),
                0,
                0
            )
            // get any return value
            returndatacopy(0, 0, returndatasize())
            // return any return value or error back to the caller
            switch result
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    receive() external payable {}
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.10;

/******************************************************************************\
* EIP-2535: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

interface ICegaEntry {
    enum ProxyImplementationAction {
        Add,
        Replace,
        Remove
    }
    // Add=0, Replace=1, Remove=2

    struct ProxyImplementation {
        address implAddress;
        ProxyImplementationAction action;
        bytes4[] functionSelectors;
    }

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

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

// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.10;

/******************************************************************************\
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

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

library CegaEntryLib {
    bytes32 constant PROXY_STORAGE_POSITION =
        bytes32(uint256(keccak256("cega.proxy.implementation.storage")) - 1);

    struct ImplementationAddressAndPosition {
        address implAddress;
        uint96 functionSelectorPosition; // position in implementationFunctionSelectors.functionSelectors array
    }

    struct ImplementationFunctionSelectors {
        bytes4[] functionSelectors;
        uint256 implementationAddressPosition; // position of implAddress in implementationAddresses array
    }

    struct ProxyStorage {
        // maps function selector to the implementation address and
        // the position of the selector in the implementationFunctionSelectors.selectors array
        mapping(bytes4 => ImplementationAddressAndPosition) selectorToImplAndPosition;
        // maps implementation addresses to function selectors
        mapping(address => ImplementationFunctionSelectors) implementationFunctionSelectors;
        // implementation addresses
        address[] implementationAddresses;
        // Used to query if a contract implements an interface.
        // Used to implement ERC-165.
        mapping(bytes4 => bool) supportedInterfaces;
        // owner of the contract
        address contractOwner;
    }

    function proxyStorage() internal pure returns (ProxyStorage storage ds) {
        bytes32 position = PROXY_STORAGE_POSITION;
        assembly {
            ds.slot := position
        }
    }

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

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

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

    function enforceIsContractOwner() internal view {
        require(
            msg.sender == proxyStorage().contractOwner,
            "CegaEntry: Must be contract owner"
        );
    }

    event DiamondCut(
        ICegaEntry.ProxyImplementation[] _implementationData,
        address _init,
        bytes _calldata
    );

    // Internal function version of diamondCut
    function updateImplementation(
        ICegaEntry.ProxyImplementation[] memory _implementationData,
        address _init,
        bytes memory _calldata
    ) internal {
        for (
            uint256 implIndex;
            implIndex < _implementationData.length;
            implIndex++
        ) {
            ICegaEntry.ProxyImplementationAction action = _implementationData[
                implIndex
            ].action;
            if (action == ICegaEntry.ProxyImplementationAction.Add) {
                addFunctions(
                    _implementationData[implIndex].implAddress,
                    _implementationData[implIndex].functionSelectors
                );
            } else if (action == ICegaEntry.ProxyImplementationAction.Replace) {
                replaceFunctions(
                    _implementationData[implIndex].implAddress,
                    _implementationData[implIndex].functionSelectors
                );
            } else if (action == ICegaEntry.ProxyImplementationAction.Remove) {
                removeFunctions(
                    _implementationData[implIndex].implAddress,
                    _implementationData[implIndex].functionSelectors
                );
            } else {
                revert("CegaEntry: Incorrect ProxyImplementationAction");
            }
        }
        emit DiamondCut(_implementationData, _init, _calldata);
        initializeImplementation(_init, _calldata);
    }

    function addFunctions(
        address _implementationAddress,
        bytes4[] memory _functionSelectors
    ) internal {
        require(
            _functionSelectors.length > 0,
            "CegaEntry: No selectors in implementation to cut"
        );
        ProxyStorage storage ds = proxyStorage();
        require(
            _implementationAddress != address(0),
            "CegaEntry: Add implementation can't be address(0)"
        );
        uint96 selectorPosition = uint96(
            ds
                .implementationFunctionSelectors[_implementationAddress]
                .functionSelectors
                .length
        );
        // add new implementation address if it does not exist
        if (selectorPosition == 0) {
            addFacet(ds, _implementationAddress);
        }
        for (
            uint256 selectorIndex;
            selectorIndex < _functionSelectors.length;
            selectorIndex++
        ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldImplementationAddress = ds
                .selectorToImplAndPosition[selector]
                .implAddress;
            require(
                oldImplementationAddress == address(0),
                "CegaEntry: Can't add function that already exists"
            );
            addFunction(ds, selector, selectorPosition, _implementationAddress);
            selectorPosition++;
        }
    }

    function replaceFunctions(
        address _implementationAddress,
        bytes4[] memory _functionSelectors
    ) internal {
        require(
            _functionSelectors.length > 0,
            "CegaEntry: No selectors in implementation to cut"
        );
        ProxyStorage storage ds = proxyStorage();
        require(
            _implementationAddress != address(0),
            "CegaEntry: Replace implementation can't be address(0)"
        );
        uint96 selectorPosition = uint96(
            ds
                .implementationFunctionSelectors[_implementationAddress]
                .functionSelectors
                .length
        );
        // add new implementation address if it does not exist
        if (selectorPosition == 0) {
            addFacet(ds, _implementationAddress);
        }
        for (
            uint256 selectorIndex;
            selectorIndex < _functionSelectors.length;
            selectorIndex++
        ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldImplementationAddress = ds
                .selectorToImplAndPosition[selector]
                .implAddress;
            require(
                oldImplementationAddress != _implementationAddress,
                "CegaEntry: Can't replace function with same function"
            );
            removeFunction(ds, oldImplementationAddress, selector);
            addFunction(ds, selector, selectorPosition, _implementationAddress);
            selectorPosition++;
        }
    }

    function removeFunctions(
        address _implementationAddress,
        bytes4[] memory _functionSelectors
    ) internal {
        require(
            _functionSelectors.length > 0,
            "CegaEntry: No selectors in implementation to cut"
        );
        ProxyStorage storage ds = proxyStorage();
        // if function does not exist then do nothing and return
        require(
            _implementationAddress == address(0),
            "CegaEntry: Remove implementation address must be address(0)"
        );
        for (
            uint256 selectorIndex;
            selectorIndex < _functionSelectors.length;
            selectorIndex++
        ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldImplementationAddress = ds
                .selectorToImplAndPosition[selector]
                .implAddress;
            removeFunction(ds, oldImplementationAddress, selector);
        }
    }

    function addFacet(
        ProxyStorage storage ds,
        address _implementationAddress
    ) internal {
        enforceHasContractCode(
            _implementationAddress,
            "CegaEntry: New implementation has no code"
        );
        ds
            .implementationFunctionSelectors[_implementationAddress]
            .implementationAddressPosition = ds.implementationAddresses.length;
        ds.implementationAddresses.push(_implementationAddress);
    }

    function addFunction(
        ProxyStorage storage ds,
        bytes4 _selector,
        uint96 _selectorPosition,
        address _implementationAddress
    ) internal {
        ds
            .selectorToImplAndPosition[_selector]
            .functionSelectorPosition = _selectorPosition;
        ds
            .implementationFunctionSelectors[_implementationAddress]
            .functionSelectors
            .push(_selector);
        ds
            .selectorToImplAndPosition[_selector]
            .implAddress = _implementationAddress;
    }

    function removeFunction(
        ProxyStorage storage ds,
        address _implementationAddress,
        bytes4 _selector
    ) internal {
        require(
            _implementationAddress != address(0),
            "CegaEntry: Can't remove function that doesn't exist"
        );
        // an immutable function is a function defined directly in a cegaEntry
        require(
            _implementationAddress != address(this),
            "CegaEntry: Can't remove immutable function"
        );
        // replace selector with last selector, then delete last selector
        uint256 selectorPosition = ds
            .selectorToImplAndPosition[_selector]
            .functionSelectorPosition;
        uint256 lastSelectorPosition = ds
            .implementationFunctionSelectors[_implementationAddress]
            .functionSelectors
            .length - 1;
        // if not the same then replace _selector with lastSelector
        if (selectorPosition != lastSelectorPosition) {
            bytes4 lastSelector = ds
                .implementationFunctionSelectors[_implementationAddress]
                .functionSelectors[lastSelectorPosition];
            ds
                .implementationFunctionSelectors[_implementationAddress]
                .functionSelectors[selectorPosition] = lastSelector;
            ds
                .selectorToImplAndPosition[lastSelector]
                .functionSelectorPosition = uint96(selectorPosition);
        }
        // delete the last selector
        ds
            .implementationFunctionSelectors[_implementationAddress]
            .functionSelectors
            .pop();
        delete ds.selectorToImplAndPosition[_selector];

        // if no more selectors for implementation address then delete the implementation address
        if (lastSelectorPosition == 0) {
            // replace implementation address with last implementation address and delete last implementation address
            uint256 lastImplementationAddressPosition = ds
                .implementationAddresses
                .length - 1;
            uint256 implementationAddressPosition = ds
                .implementationFunctionSelectors[_implementationAddress]
                .implementationAddressPosition;
            if (
                implementationAddressPosition !=
                lastImplementationAddressPosition
            ) {
                address lastImplementationAddress = ds.implementationAddresses[
                    lastImplementationAddressPosition
                ];
                ds.implementationAddresses[
                    implementationAddressPosition
                ] = lastImplementationAddress;
                ds
                    .implementationFunctionSelectors[lastImplementationAddress]
                    .implementationAddressPosition = implementationAddressPosition;
            }
            ds.implementationAddresses.pop();
            delete ds
                .implementationFunctionSelectors[_implementationAddress]
                .implementationAddressPosition;
        }
    }

    function initializeImplementation(
        address _init,
        bytes memory _calldata
    ) internal {
        if (_init == address(0)) {
            require(
                _calldata.length == 0,
                "CegaEntry: _init is address(0) but _calldata is not empty"
            );
        } else {
            require(
                _calldata.length > 0,
                "CegaEntry: _calldata is empty but _init is not address(0)"
            );
            if (_init != address(this)) {
                enforceHasContractCode(
                    _init,
                    "CegaEntry: _init address has no code"
                );
            }
            (bool success, bytes memory error) = _init.delegatecall(_calldata);
            if (!success) {
                if (error.length > 0) {
                    // bubble up the error
                    assembly {
                        revert(add(error, 0x20), mload(error))
                    }
                } else {
                    revert("CegaEntry: _init function reverted");
                }
            }
        }
    }

    function enforceHasContractCode(
        address _contract,
        string memory _errorMessage
    ) internal view {
        require(_contract.code.length > 0, _errorMessage);
    }
}

{
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "optimizer": {
    "enabled": true,
    "runs": 200,
    "details": {
      "yulDetails": {
        "optimizerSteps": "u"
      }
    }
  },
  "viaIR": true,
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_contractOwner","type":"address"}],"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"components":[{"internalType":"address","name":"implAddress","type":"address"},{"internalType":"enum ICegaEntry.ProxyImplementationAction","name":"action","type":"uint8"},{"internalType":"bytes4[]","name":"functionSelectors","type":"bytes4[]"}],"indexed":false,"internalType":"struct ICegaEntry.ProxyImplementation[]","name":"_diamondCut","type":"tuple[]"},{"indexed":false,"internalType":"address","name":"_init","type":"address"},{"indexed":false,"internalType":"bytes","name":"_calldata","type":"bytes"}],"name":"DiamondCut","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"components":[{"internalType":"address","name":"implAddress","type":"address"},{"internalType":"enum ICegaEntry.ProxyImplementationAction","name":"action","type":"uint8"},{"internalType":"bytes4[]","name":"functionSelectors","type":"bytes4[]"}],"internalType":"struct ICegaEntry.ProxyImplementation[]","name":"_implementationParams","type":"tuple[]"},{"internalType":"address","name":"_init","type":"address"},{"internalType":"bytes","name":"_calldata","type":"bytes"}],"name":"diamondCut","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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0000000000000000000000001ddf7c4c98a78b492bb4a2881358f183d94c9806

-----Decoded View---------------
Arg [0] : _contractOwner (address): 0x1DdF7C4C98a78b492bb4a2881358f183d94c9806

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000001ddf7c4c98a78b492bb4a2881358f183d94c9806