Contract Address Details

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;
pragma abicoder v2;

import "@rarible/exchange-interfaces/contracts/IRoyaltiesProvider.sol";
import "@rarible/royalties/contracts/LibRoyaltiesV2.sol";
import "@rarible/royalties/contracts/LibRoyaltiesV1.sol";
import "@rarible/royalties/contracts/LibRoyalties2981.sol";
import "@rarible/royalties/contracts/RoyaltiesV1.sol";
import "@rarible/royalties/contracts/RoyaltiesV2.sol";
import "@rarible/royalties/contracts/IERC2981.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

contract RoyaltiesRegistry is IRoyaltiesProvider, OwnableUpgradeable {
    /// @dev deprecated
    event RoyaltiesSetForToken(address indexed token, uint indexed tokenId, LibPart.Part[] royalties);
    /// @dev emitted when royalties set for token in 
    event RoyaltiesSetForContract(address indexed token, LibPart.Part[] royalties);

    /// @dev struct to store royalties in royaltiesByToken
    struct RoyaltiesSet {
        bool initialized;
        LibPart.Part[] royalties;
    }

    /// @dev deprecated
    mapping(bytes32 => RoyaltiesSet) public royaltiesByTokenAndTokenId;
    /// @dev stores royalties for token contract, set in setRoyaltiesByToken() method
    mapping(address => RoyaltiesSet) public royaltiesByToken;
    /// @dev stores external provider and royalties type for token contract
    mapping(address => uint) public royaltiesProviders;

    /// @dev total amount or supported royalties types
    // 0 - royalties type is unset
    // 1 - royaltiesByToken, 2 - v2, 3 - v1,
    // 4 - external provider, 5 - EIP-2981
    // 6 - unsupported/nonexistent royalties type
    uint constant royaltiesTypesAmount = 6;

    function __RoyaltiesRegistry_init() external initializer {
        __Ownable_init_unchained();
    }

    /// @dev sets external provider for token contract, and royalties type = 4
    function setProviderByToken(address token, address provider) external {
        checkOwner(token);
        setRoyaltiesType(token, 4, provider);
    }

    /// @dev returns provider address for token contract from royaltiesProviders mapping
    function getProvider(address token) public view returns(address) {
        return address(royaltiesProviders[token]);
    }

    /// @dev returns royalties type for token contract
    function getRoyaltiesType(address token) external view returns(uint) {
        return _getRoyaltiesType(royaltiesProviders[token]);
    }

    /// @dev returns royalties type from uint
    function _getRoyaltiesType(uint data) internal pure returns(uint) {
        for (uint i = 1; i <= royaltiesTypesAmount; ++i) {
            if (data / 2**(256-i) == 1) {
                return i;
            }
        }
        return 0;
    }

    /// @dev sets royalties type for token contract
    function setRoyaltiesType(address token, uint royaltiesType, address royaltiesProvider) internal {
        require(royaltiesType > 0 && royaltiesType <= royaltiesTypesAmount, "wrong royaltiesType");
        royaltiesProviders[token] = uint(royaltiesProvider) + 2**(256 - royaltiesType);
    }

    /// @dev clears and sets new royalties type for token contract
    function forceSetRoyaltiesType(address token, uint royaltiesType) external {
        checkOwner(token);
        setRoyaltiesType(token, royaltiesType, getProvider(token));
    }

    /// @dev clears royalties type for token contract
    function clearRoyaltiesType(address token) external {
        checkOwner(token);
        royaltiesProviders[token] = uint(getProvider(token));
    }

    /// @dev sets royalties for token contract in royaltiesByToken mapping and royalties type = 1
    function setRoyaltiesByToken(address token, LibPart.Part[] memory royalties) external {
        checkOwner(token);
        //clearing royaltiesProviders value for the token
        delete royaltiesProviders[token];
        // setting royaltiesType = 1 for the token
        setRoyaltiesType(token, 1, address(0));
        uint sumRoyalties = 0;
        delete royaltiesByToken[token];
        for (uint i = 0; i < royalties.length; ++i) {
            require(royalties[i].account != address(0x0), "RoyaltiesByToken recipient should be present");
            require(royalties[i].value != 0, "Royalty value for RoyaltiesByToken should be > 0");
            royaltiesByToken[token].royalties.push(royalties[i]);
            sumRoyalties += royalties[i].value;
        }
        require(sumRoyalties < 10000, "Set by token royalties sum more, than 100%");
        royaltiesByToken[token].initialized = true;
        emit RoyaltiesSetForContract(token, royalties);
    }

    /// @dev checks if msg.sender is owner of this contract or owner of the token contract
    function checkOwner(address token) internal view {
        if ((owner() != _msgSender()) && (OwnableUpgradeable(token).owner() != _msgSender())) {
            revert("Token owner not detected");
        }
    }

    /// @dev calculates royalties type for token contract
    function calculateRoyaltiesType(address token, address royaltiesProvider ) internal view returns(uint) {   
        try IERC165Upgradeable(token).supportsInterface(LibRoyaltiesV2._INTERFACE_ID_ROYALTIES) returns(bool result) {
            if (result) {
                return 2;
            }
        } catch { }

        try IERC165Upgradeable(token).supportsInterface(LibRoyaltiesV1._INTERFACE_ID_FEES) returns(bool result) {
            if (result) {
                return 3;
            }
        } catch { }
        
        try IERC165Upgradeable(token).supportsInterface(LibRoyalties2981._INTERFACE_ID_ROYALTIES) returns(bool result) {
            if (result) {
                return 5;
            }
        } catch { }
        
        if (royaltiesProvider != address(0)) {
            return 4;
        }

        if (royaltiesByToken[token].initialized) {
            return 1;
        }

        return 6;
    }

    /// @dev returns royalties for token contract and token id
    function getRoyalties(address token, uint tokenId) override external returns (LibPart.Part[] memory) {
        uint royaltiesProviderData = royaltiesProviders[token];

        address royaltiesProvider = address(royaltiesProviderData);
        uint royaltiesType = _getRoyaltiesType(royaltiesProviderData);

        // case when royaltiesType is not set
        if (royaltiesType == 0) {
            // calculating royalties type for token
            royaltiesType = calculateRoyaltiesType(token, royaltiesProvider);
            
            //saving royalties type
            setRoyaltiesType(token, royaltiesType, royaltiesProvider);
        }

        //case royaltiesType = 1, royalties are set in royaltiesByToken
        if (royaltiesType == 1) {
            return royaltiesByToken[token].royalties;
        }

        //case royaltiesType = 2, royalties rarible v2
        if (royaltiesType == 2) {
            return getRoyaltiesRaribleV2(token,tokenId);
        }

        //case royaltiesType = 3, royalties rarible v1
        if (royaltiesType == 3) {
            return getRoyaltiesRaribleV1(token, tokenId);
        }

        //case royaltiesType = 4, royalties from external provider
        if (royaltiesType == 4) {
            return providerExtractor(token, tokenId, royaltiesProvider);
        }

        //case royaltiesType = 5, royalties EIP-2981
        if (royaltiesType == 5) {
            return getRoyaltiesEIP2981(token, tokenId);
        }

        // case royaltiesType = 6, unknown/empty royalties
        if (royaltiesType == 6) {
            return new LibPart.Part[](0);
        } 

        revert("something wrong in getRoyalties");
    }

    /// @dev tries to get royalties rarible-v2 for token and tokenId
    function getRoyaltiesRaribleV2(address token, uint tokenId) internal view returns (LibPart.Part[] memory) {
        try RoyaltiesV2(token).getRaribleV2Royalties(tokenId) returns (LibPart.Part[] memory result) {
            return result;
        } catch {
            return new LibPart.Part[](0);
        }
    }

    /// @dev tries to get royalties rarible-v1 for token and tokenId
    function getRoyaltiesRaribleV1(address token, uint tokenId) internal view returns (LibPart.Part[] memory) {
        RoyaltiesV1 v1 = RoyaltiesV1(token);
        address payable[] memory recipients;
        try v1.getFeeRecipients(tokenId) returns (address payable[] memory resultRecipients) {
            recipients = resultRecipients;
        } catch {
            return new LibPart.Part[](0);
        }
        uint[] memory values;
        try v1.getFeeBps(tokenId) returns (uint[] memory resultValues) {
            values = resultValues;
        } catch {
            return new LibPart.Part[](0);
        }
        if (values.length != recipients.length) {
            return new LibPart.Part[](0);
        }
        LibPart.Part[] memory result = new LibPart.Part[](values.length);
        for (uint256 i = 0; i < values.length; ++i) {
            result[i].value = uint96(values[i]);
            result[i].account = recipients[i];
        }
        return result;
    }

    /// @dev tries to get royalties EIP-2981 for token and tokenId
    function getRoyaltiesEIP2981(address token, uint tokenId) internal view returns (LibPart.Part[] memory) {
        try IERC2981(token).royaltyInfo(tokenId, LibRoyalties2981._WEIGHT_VALUE) returns (address receiver, uint256 royaltyAmount) {
            return LibRoyalties2981.calculateRoyalties(receiver, royaltyAmount);
        } catch {
            return new LibPart.Part[](0);
        }
    }

    /// @dev tries to get royalties for token and tokenId from external provider set in royaltiesProviders
    function providerExtractor(address token, uint tokenId, address providerAddress) internal returns (LibPart.Part[] memory) {
        try IRoyaltiesProvider(providerAddress).getRoyalties(token, tokenId) returns (LibPart.Part[] memory result) {
            return result;
        } catch {
            return new LibPart.Part[](0);
        }
    }

    uint256[46] private __gap;
}
        

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

library LibRoyaltiesV1 {
    /*
     * bytes4(keccak256('getFeeBps(uint256)')) == 0x0ebd4c7f
     * bytes4(keccak256('getFeeRecipients(uint256)')) == 0xb9c4d9fb
     *
     * => 0x0ebd4c7f ^ 0xb9c4d9fb == 0xb7799584
     */
    bytes4 constant _INTERFACE_ID_FEES = 0xb7799584;
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

library LibRoyaltiesV2 {
    /*
     * bytes4(keccak256('getRaribleV2Royalties(uint256)')) == 0xcad96cca
     */
    bytes4 constant _INTERFACE_ID_ROYALTIES = 0xcad96cca;
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

interface RoyaltiesV1 {
    event SecondarySaleFees(uint256 tokenId, address[] recipients, uint[] bps);

    function getFeeRecipients(uint256 id) external view returns (address payable[] memory);
    function getFeeBps(uint256 id) external view returns (uint[] memory);
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;
pragma abicoder v2;

import "@rarible/lib-part/contracts/LibPart.sol";

interface RoyaltiesV2 {
    event RoyaltiesSet(uint256 tokenId, LibPart.Part[] royalties);

    function getRaribleV2Royalties(uint256 id) external view returns (LibPart.Part[] memory);
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/Initializable.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
    uint256[49] private __gap;
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
          

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <0.8.0;

import "../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

import "../../introspection/IERC165Upgradeable.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
      * @dev Safely transfers `tokenId` token from `from` to `to`.
      *
      * Requirements:
      *
      * - `from` cannot be the zero address.
      * - `to` cannot be the zero address.
      * - `tokenId` token must exist and be owned by `from`.
      * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
      * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
      *
      * Emits a {Transfer} event.
      */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/Initializable.sol";

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
    uint256[50] private __gap;
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;
pragma abicoder v2;

import "@rarible/lib-part/contracts/LibPart.sol";

interface IRoyaltiesProvider {
    function getRoyalties(address token, uint tokenId) external returns (LibPart.Part[] memory);
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

library LibPart {
    bytes32 public constant TYPE_HASH = keccak256("Part(address account,uint96 value)");

    struct Part {
        address payable account;
        uint96 value;
    }

    function hash(Part memory part) internal pure returns (bytes32) {
        return keccak256(abi.encode(TYPE_HASH, part.account, part.value));
    }
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;
import "@rarible/lib-part/contracts/LibPart.sol";
///
/// @dev Interface for the NFT Royalty Standard
///
//interface IERC2981 is IERC165 {
interface IERC2981 {
    /// ERC165 bytes to add to interface array - set in parent contract
    /// implementing this standard
    ///
    /// bytes4(keccak256("royaltyInfo(uint256,uint256)")) == 0x2a55205a
    /// bytes4 private constant _INTERFACE_ID_ERC2981 = 0x2a55205a;
    /// _registerInterface(_INTERFACE_ID_ERC2981);

    /// @notice Called with the sale price to determine how much royalty
    //          is owed and to whom.
    /// @param _tokenId - the NFT asset queried for royalty information
    /// @param _salePrice - the sale price of the NFT asset specified by _tokenId
    /// @return receiver - address of who should be sent the royalty payment
    /// @return royaltyAmount - the royalty payment amount for _salePrice
    function royaltyInfo(
        uint256 _tokenId,
        uint256 _salePrice
    ) external view returns (
        address receiver,
        uint256 royaltyAmount
    );
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

import "@rarible/lib-part/contracts/LibPart.sol";

library LibRoyalties2981 {
    /*
     * https://eips.ethereum.org/EIPS/eip-2981: bytes4 private constant _INTERFACE_ID_ERC2981 = 0x2a55205a;
     */
    bytes4 constant _INTERFACE_ID_ROYALTIES = 0x2a55205a;
    uint96 constant _WEIGHT_VALUE = 1000000;

    /*Method for converting amount to percent and forming LibPart*/
    function calculateRoyalties(address to, uint256 amount) internal view returns (LibPart.Part[] memory) {
        LibPart.Part[] memory result;
        if (amount == 0) {
            return result;
        }
        uint256 percent = amount * 10000 / _WEIGHT_VALUE;
        require(percent < 10000, "Royalties 2981 exceeds 100%");
        result = new LibPart.Part[](1);
        result[0].account = payable(to);
        result[0].value = uint96(percent);
        return result;
    }
}