Giving Garden

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

/**************************************************************\
 * GivingGarden Diamond authored by @0xJonesDev
 * 
 * This contract has been written specifically for
 * GivingGarden by makeitrad x 0xJones
 * 
 * Adapted from work by Nick Mudge @mudgen
 * This contract is part of a project which adheres to
 * EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/**************************************************************/

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

contract GivingGarden {
    constructor(address _diamondCutFacet) payable {
        GlobalState.getState().owner = msg.sender;

        IDiamondCut.FacetCut[] memory cut = new IDiamondCut.FacetCut[](1);
        bytes4[] memory functionSelectors = new bytes4[](1);
        functionSelectors[0] = IDiamondCut.diamondCut.selector;
        cut[0] = IDiamondCut.FacetCut({
            facetAddress: _diamondCutFacet,
            action: IDiamondCut.FacetCutAction.Add,
            functionSelectors: functionSelectors
        });
        LibDiamond.diamondCut(cut, address(0), "");
    }

    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;

/**************************************************************\
 * Global Storage Library for NFT Smart Contracts v0.2.1
 * Authored by Lab Monster
 * 
 * This library is designed to provide diamond storage and
 * shared functionality to all facets of a diamond used for an
 * NFT collection.
/**************************************************************/

library GlobalState {
    bytes32 constant DIAMOND_STORAGE_POSITION =
        keccak256("globalstate.storage");

    struct state {
        address owner;
        mapping(address => bool) admins;
        bool paused;
    }

    /**
     * @dev Return stored state struct.
     */
    function getState() internal pure returns (state storage _state) {
        bytes32 position = DIAMOND_STORAGE_POSITION;
        assembly {
            _state.slot := position
        }
    }

    // GLOBAL FUNCTIONS //

    /**
     * @dev Returns true if provided address is an admin or the
     *      contract owner.
     */
    function isAdmin(address _addr) internal view returns (bool) {
        state storage s = getState();
        return s.owner == _addr || s.admins[_addr];
    }

    /**
     * @dev Reverts if caller is not an admin or contract owner.
     */
    function requireCallerIsAdmin() internal view {
        require(
            isAdmin(msg.sender),
            "GlobalState: caller is not admin or owner"
        );
    }

    /**
     * @dev Reverts if contract is paused.
     */
    function requireContractIsNotPaused() internal view {
        require(
            !getState().paused || isAdmin(msg.sender),
            "GlobalState: contract is paused"
        );
    }
}

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

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 ^0.8.0;

/**************************************************************\
 * Diamond Library v0.1.0 authored by Lab Monster
 * 
 * Adapted from work by Nick Mudge
 * <nick@perfectabstractions.com> (https://twitter.com/mudgen)
 * 
 * This contract is part of a project which adheres to
 * EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/**************************************************************/

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

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;
    }

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

    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;
            facetIndex++
        ) {
            (selectorCount, selectorSlot) = addReplaceRemoveFacetSelectors(
                selectorCount,
                selectorSlot,
                _diamondCut[facetIndex].facetAddress,
                _diamondCut[facetIndex].action,
                _diamondCut[facetIndex].functionSelectors
            );
        }
        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;
                selectorIndex++
            ) {
                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++;
            }
        } else if (_action == IDiamondCut.FacetCutAction.Replace) {
            enforceHasContractCode(
                _newFacetAddress,
                "LibDiamondCut: Replace facet has no code"
            );
            for (
                uint256 selectorIndex;
                selectorIndex < _selectors.length;
                selectorIndex++
            ) {
                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);
            }
        } 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;
                selectorIndex++
            ) {
                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;
                }
            }
            _selectorCount = selectorSlotCount * 8 + selectorInSlotIndex;
        } else {
            revert("LibDiamondCut: Incorrect FacetCutAction");
        }
        return (_selectorCount, _selectorSlot);
    }

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

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

{
  "compilationTarget": {
    "contracts/Diamond.sol": "GivingGarden"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}