Contract Source Code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import {INiftyKitAppRegistry} from "../interfaces/INiftyKitAppRegistry.sol";
import {INiftyKitV3} from "../interfaces/INiftyKitV3.sol";

library BaseStorage {
    enum Transfer {
        AllowAll,
        AllowedOperatorsOnly,
        BlockAll
    }

    struct URIEntry {
        bool isValue;
        string tokenURI;
    }

    bytes32 private constant STORAGE_SLOT = keccak256("niftykit.base.storage");

    uint256 public constant ADMIN_ROLE = 1 << 0;
    uint256 public constant MANAGER_ROLE = 1 << 1;
    uint256 public constant API_ROLE = 1 << 2;

    struct Layout {
        mapping(bytes32 => INiftyKitAppRegistry.App) _apps;
        mapping(address => bool) _allowedOperators;
        mapping(uint256 => bool) _blockedTokenIds;
        mapping(uint256 => URIEntry) _tokenURIs;
        bool _operatorFilteringEnabled;
        Transfer _transferStatus;
        INiftyKitV3 _niftyKit;
        uint8 _baseVersion;
        address _treasury;
        string _baseURI;
        address _mintSigner;
        address _trustedForwarder;
    }

    function layout() internal pure returns (Layout storage ds) {
        bytes32 position = STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            ds.slot := position
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import {INiftyKitAppRegistry} from "../interfaces/INiftyKitAppRegistry.sol";
import {INiftyKitV3} from "../interfaces/INiftyKitV3.sol";
import {IDiamondCut} from "../interfaces/IDiamondCut.sol";
import {LibDiamond} from "../libraries/LibDiamond.sol";
import {BaseStorage} from "./BaseStorage.sol";

contract DiamondCollection {
    constructor(INiftyKitV3.DiamondArgs memory args) {
        BaseStorage.Layout storage layout = BaseStorage.layout();
        layout._niftyKit = INiftyKitV3(msg.sender);
        INiftyKitAppRegistry registry = INiftyKitAppRegistry(
            layout._niftyKit.appRegistry()
        );
        INiftyKitAppRegistry.Base memory base = registry.getBase();
        IDiamondCut.FacetCut[] memory facetCuts = new IDiamondCut.FacetCut[](
            args.apps.length + 1
        );

        layout._treasury = args.treasury;
        layout._baseVersion = base.version;
        layout._baseURI = args.baseURI;
        layout._trustedForwarder = args.trustedForwarder;
        facetCuts = _appFacets(facetCuts, layout, registry, args.apps);
        facetCuts = _baseFacet(facetCuts, base);

        LibDiamond.diamondCut(
            facetCuts,
            base.implementation,
            abi.encodeWithSignature(
                "_initialize(address,address,string,string,address,uint16)",
                args.owner,
                args.admin,
                args.name,
                args.symbol,
                args.royalty,
                args.royaltyBps
            )
        );
    }

    function _appFacets(
        IDiamondCut.FacetCut[] memory facetCuts,
        BaseStorage.Layout storage layout,
        INiftyKitAppRegistry registry,
        bytes32[] memory apps
    ) internal returns (IDiamondCut.FacetCut[] memory) {
        LibDiamond.DiamondStorage storage ds = LibDiamond.diamondStorage();
        uint256 appsLength = apps.length;
        for (uint256 i = 0; i < appsLength; ) {
            INiftyKitAppRegistry.App memory app = registry.getApp(apps[i]);
            if (app.version == 0) revert("App does not exist");

            facetCuts[i] = IDiamondCut.FacetCut({
                facetAddress: app.implementation,
                action: IDiamondCut.FacetCutAction.Add,
                functionSelectors: app.selectors
            });

            ds.supportedInterfaces[app.interfaceId] = true;
            layout._apps[apps[i]] = app;

            unchecked {
                i++;
            }
        }

        return facetCuts;
    }

    function _baseFacet(
        IDiamondCut.FacetCut[] memory facetCuts,
        INiftyKitAppRegistry.Base memory base
    ) internal returns (IDiamondCut.FacetCut[] memory) {
        LibDiamond.DiamondStorage storage ds = LibDiamond.diamondStorage();
        facetCuts[facetCuts.length - 1] = IDiamondCut.FacetCut({
            facetAddress: base.implementation,
            action: IDiamondCut.FacetCutAction.Add,
            functionSelectors: base.selectors
        });

        uint256 idsLength = base.interfaceIds.length;
        for (uint256 i = 0; i < idsLength; ) {
            ds.supportedInterfaces[base.interfaceIds[i]] = true;

            unchecked {
                i++;
            }
        }

        return facetCuts;
    }

    // Find facet for function that is called and execute the
    // function if a facet is found and return any value.
    fallback() external payable {
        LibDiamond.DiamondStorage storage ds;
        bytes32 position = LibDiamond.DIAMOND_STORAGE_POSITION;
        // get diamond storage
        assembly {
            ds.slot := position
        }
        // get facet from function selector
        address facet = address(bytes20(ds.facets[msg.sig]));
        require(facet != address(0), "Diamond: Function does not exist");
        // Execute external function from facet using delegatecall and return any value.
        assembly {
            // copy function selector and any arguments
            calldatacopy(0, 0, calldatasize())
            // execute function call using the facet
            let result := delegatecall(gas(), facet, 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: MIT
pragma solidity ^0.8.0;

/******************************************************************************\
* Author: Nick Mudge <[email protected]> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

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

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

    /// @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;

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

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

interface INiftyKitAppRegistry {
    struct App {
        address implementation;
        bytes4 interfaceId;
        bytes4[] selectors;
        uint8 version;
    }

    struct Base {
        address implementation;
        bytes4[] interfaceIds;
        bytes4[] selectors;
        uint8 version;
    }

    /**
     * Get App Facet by app name
     * @param name app name
     */
    function getApp(bytes32 name) external view returns (App memory);

    /**
     * Get base Facet
     */
    function getBase() external view returns (Base memory);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

interface INiftyKitV3 {
    struct DiamondArgs {
        address owner;
        address admin;
        address treasury;
        address royalty;
        address trustedForwarder;
        uint16 royaltyBps;
        string name;
        string symbol;
        string baseURI;
        bytes32[] apps;
    }

    /**
     * @dev Returns app registry address.
     */
    function appRegistry() external returns (address);

    /**
     * @dev Returns the commission amount (sellerFee, buyerFee).
     */
    function commission(
        address collection,
        uint256 amount
    ) external view returns (uint256, uint256);

    /**
     * @dev Get fees by amount (called from collection)
     */
    function getFees(uint256 amount) external view returns (uint256, uint256);
}

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

/******************************************************************************\
* Author: Nick Mudge <[email protected]> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/
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 InitializationFunctionReverted(address _initializationContractAddress, bytes _calldata);

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

    struct DiamondStorage {
        // maps function selectors to the facets that execute the functions.
        // and maps the selectors to their position in the selectorSlots array.
        // func selector => address facet, selector position
        mapping(bytes4 => bytes32) facets;
        // array of slots of function selectors.
        // each slot holds 8 function selectors.
        mapping(uint256 => bytes32) selectorSlots;
        // The number of function selectors in selectorSlots
        uint16 selectorCount;
        // 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 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 {
        require(msg.sender == diamondStorage().contractOwner, "LibDiamond: Must be contract owner");
    }

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

    bytes32 constant CLEAR_ADDRESS_MASK = bytes32(uint256(0xffffffffffffffffffffffff));
    bytes32 constant CLEAR_SELECTOR_MASK = bytes32(uint256(0xffffffff << 224));

    // Internal function version of diamondCut
    // This code is almost the same as the external diamondCut,
    // except it is using 'Facet[] memory _diamondCut' instead of
    // 'Facet[] calldata _diamondCut'.
    // The code is duplicated to prevent copying calldata to memory which
    // causes an error for a two dimensional array.
    function diamondCut(
        IDiamondCut.FacetCut[] memory _diamondCut,
        address _init,
        bytes memory _calldata
    ) internal {
        DiamondStorage storage ds = diamondStorage();
        uint256 originalSelectorCount = ds.selectorCount;
        uint256 selectorCount = originalSelectorCount;
        bytes32 selectorSlot;
        // Check if last selector slot is not full
        // "selectorCount & 7" is a gas efficient modulo by eight "selectorCount % 8" 
        if (selectorCount & 7 > 0) {
            // get last selectorSlot
            // "selectorSlot >> 3" is a gas efficient division by 8 "selectorSlot / 8"
            selectorSlot = ds.selectorSlots[selectorCount >> 3];
        }
        // loop through diamond cut
        for (uint256 facetIndex; facetIndex < _diamondCut.length; ) {
            (selectorCount, selectorSlot) = addReplaceRemoveFacetSelectors(
                selectorCount,
                selectorSlot,
                _diamondCut[facetIndex].facetAddress,
                _diamondCut[facetIndex].action,
                _diamondCut[facetIndex].functionSelectors
            );

            unchecked {
                facetIndex++;
            }
        }
        if (selectorCount != originalSelectorCount) {
            ds.selectorCount = uint16(selectorCount);
        }
        // If last selector slot is not full
        // "selectorCount & 7" is a gas efficient modulo by eight "selectorCount % 8" 
        if (selectorCount & 7 > 0) {
            // "selectorSlot >> 3" is a gas efficient division by 8 "selectorSlot / 8"
            ds.selectorSlots[selectorCount >> 3] = selectorSlot;
        }
        emit DiamondCut(_diamondCut, _init, _calldata);
        initializeDiamondCut(_init, _calldata);
    }

    function addReplaceRemoveFacetSelectors(
        uint256 _selectorCount,
        bytes32 _selectorSlot,
        address _newFacetAddress,
        IDiamondCut.FacetCutAction _action,
        bytes4[] memory _selectors
    ) internal returns (uint256, bytes32) {
        DiamondStorage storage ds = diamondStorage();
        require(_selectors.length > 0, "LibDiamondCut: No selectors in facet to cut");
        if (_action == IDiamondCut.FacetCutAction.Add) {
            enforceHasContractCode(_newFacetAddress, "LibDiamondCut: Add facet has no code");
            for (uint256 selectorIndex; selectorIndex < _selectors.length; ) {
                bytes4 selector = _selectors[selectorIndex];
                bytes32 oldFacet = ds.facets[selector];
                require(address(bytes20(oldFacet)) == address(0), "LibDiamondCut: Can't add function that already exists");
                // add facet for selector
                ds.facets[selector] = bytes20(_newFacetAddress) | bytes32(_selectorCount);
                // "_selectorCount & 7" is a gas efficient modulo by eight "_selectorCount % 8" 
                // " << 5 is the same as multiplying by 32 ( * 32)
                uint256 selectorInSlotPosition = (_selectorCount & 7) << 5;
                // clear selector position in slot and add selector
                _selectorSlot = (_selectorSlot & ~(CLEAR_SELECTOR_MASK >> selectorInSlotPosition)) | (bytes32(selector) >> selectorInSlotPosition);
                // if slot is full then write it to storage
                if (selectorInSlotPosition == 224) {
                    // "_selectorSlot >> 3" is a gas efficient division by 8 "_selectorSlot / 8"
                    ds.selectorSlots[_selectorCount >> 3] = _selectorSlot;
                    _selectorSlot = 0;
                }
                _selectorCount++;

                unchecked {
                    selectorIndex++;
                }
            }
        } else if (_action == IDiamondCut.FacetCutAction.Replace) {
            enforceHasContractCode(_newFacetAddress, "LibDiamondCut: Replace facet has no code");
            for (uint256 selectorIndex; selectorIndex < _selectors.length; ) {
                bytes4 selector = _selectors[selectorIndex];
                bytes32 oldFacet = ds.facets[selector];
                address oldFacetAddress = address(bytes20(oldFacet));
                // only useful if immutable functions exist
                require(oldFacetAddress != address(this), "LibDiamondCut: Can't replace immutable function");
                require(oldFacetAddress != _newFacetAddress, "LibDiamondCut: Can't replace function with same function");
                require(oldFacetAddress != address(0), "LibDiamondCut: Can't replace function that doesn't exist");
                // replace old facet address
                ds.facets[selector] = (oldFacet & CLEAR_ADDRESS_MASK) | bytes20(_newFacetAddress);

                unchecked {
                    selectorIndex++;
                }
            }
        } else if (_action == IDiamondCut.FacetCutAction.Remove) {
            require(_newFacetAddress == address(0), "LibDiamondCut: Remove facet address must be address(0)");
            // "_selectorCount >> 3" is a gas efficient division by 8 "_selectorCount / 8"
            uint256 selectorSlotCount = _selectorCount >> 3;
            // "_selectorCount & 7" is a gas efficient modulo by eight "_selectorCount % 8" 
            uint256 selectorInSlotIndex = _selectorCount & 7;
            for (uint256 selectorIndex; selectorIndex < _selectors.length; ) {
                if (_selectorSlot == 0) {
                    // get last selectorSlot
                    selectorSlotCount--;
                    _selectorSlot = ds.selectorSlots[selectorSlotCount];
                    selectorInSlotIndex = 7;
                } else {
                    selectorInSlotIndex--;
                }
                bytes4 lastSelector;
                uint256 oldSelectorsSlotCount;
                uint256 oldSelectorInSlotPosition;
                // adding a block here prevents stack too deep error
                {
                    bytes4 selector = _selectors[selectorIndex];
                    bytes32 oldFacet = ds.facets[selector];
                    require(address(bytes20(oldFacet)) != address(0), "LibDiamondCut: Can't remove function that doesn't exist");
                    // only useful if immutable functions exist
                    require(address(bytes20(oldFacet)) != address(this), "LibDiamondCut: Can't remove immutable function");
                    // replace selector with last selector in ds.facets
                    // gets the last selector
                    // " << 5 is the same as multiplying by 32 ( * 32)
                    lastSelector = bytes4(_selectorSlot << (selectorInSlotIndex << 5));
                    if (lastSelector != selector) {
                        // update last selector slot position info
                        ds.facets[lastSelector] = (oldFacet & CLEAR_ADDRESS_MASK) | bytes20(ds.facets[lastSelector]);
                    }
                    delete ds.facets[selector];
                    uint256 oldSelectorCount = uint16(uint256(oldFacet));
                    // "oldSelectorCount >> 3" is a gas efficient division by 8 "oldSelectorCount / 8"
                    oldSelectorsSlotCount = oldSelectorCount >> 3;
                    // "oldSelectorCount & 7" is a gas efficient modulo by eight "oldSelectorCount % 8" 
                    // " << 5 is the same as multiplying by 32 ( * 32)
                    oldSelectorInSlotPosition = (oldSelectorCount & 7) << 5;
                }
                if (oldSelectorsSlotCount != selectorSlotCount) {
                    bytes32 oldSelectorSlot = ds.selectorSlots[oldSelectorsSlotCount];
                    // clears the selector we are deleting and puts the last selector in its place.
                    oldSelectorSlot =
                        (oldSelectorSlot & ~(CLEAR_SELECTOR_MASK >> oldSelectorInSlotPosition)) |
                        (bytes32(lastSelector) >> oldSelectorInSlotPosition);
                    // update storage with the modified slot
                    ds.selectorSlots[oldSelectorsSlotCount] = oldSelectorSlot;
                } else {
                    // clears the selector we are deleting and puts the last selector in its place.
                    _selectorSlot =
                        (_selectorSlot & ~(CLEAR_SELECTOR_MASK >> oldSelectorInSlotPosition)) |
                        (bytes32(lastSelector) >> oldSelectorInSlotPosition);
                }
                if (selectorInSlotIndex == 0) {
                    delete ds.selectorSlots[selectorSlotCount];
                    _selectorSlot = 0;
                }

                unchecked {
                    selectorIndex++;
                }
            }
            _selectorCount = selectorSlotCount * 8 + selectorInSlotIndex;
        } else {
            revert("LibDiamondCut: Incorrect FacetCutAction");
        }
        return (_selectorCount, _selectorSlot);
    }

    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)
        }
        require(contractSize > 0, _errorMessage);
    }
}