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// @author Unstoppable Domains, Inc.
// @date June 16th, 2021

pragma solidity ^0.8.0;

import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';
import '@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol';
import '@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol';

import './IUNSRegistry.sol';
import './RecordStorage.sol';
import './metatx/ERC2771RegistryContext.sol';
import './metatx/RegistryForwarder.sol';

/**
 * @title UNSRegistry
 * @dev An ERC721 Token see https://eips.ethereum.org/EIPS/eip-721. With
 * additional functions so other trusted contracts to interact with the tokens.
 */
contract UNSRegistry is
    Initializable,
    ContextUpgradeable,
    ERC721Upgradeable,
    ERC2771RegistryContext,
    RecordStorage,
    RegistryForwarder,
    IUNSRegistry
{
    using AddressUpgradeable for address;

    string public constant NAME = 'UNS: Registry';
    string public constant VERSION = '0.1.0';

    string internal _prefix;

    address internal _mintingManager;

    modifier onlyApprovedOrOwner(uint256 tokenId) {
        require(_isApprovedOrOwner(_msgSender(), tokenId), 'Registry: SENDER_IS_NOT_APPROVED_OR_OWNER');
        _;
    }

    modifier onlyMintingManager() {
        require(_msgSender() == _mintingManager, 'Registry: SENDER_IS_NOT_MINTING_MANAGER');
        _;
    }

    modifier protectTokenOperation(uint256 tokenId) {
        if (isTrustedForwarder(msg.sender)) {
            require(tokenId == _msgToken(), 'Registry: TOKEN_INVALID');
        }
        _invalidateNonce(tokenId);
        _;
    }

    function initialize(address mintingManager) public initializer {
        _mintingManager = mintingManager;

        __ERC721_init_unchained('Unstoppable Domains', 'UD');
        __ERC2771RegistryContext_init_unchained();
        __RegistryForwarder_init_unchained();
    }

    /// ERC721 Metadata extension

    function setTokenURIPrefix(string calldata prefix) external override onlyMintingManager {
        _prefix = prefix;
        emit NewURIPrefix(prefix);
    }

    /// Ownership

    function isApprovedOrOwner(address spender, uint256 tokenId) external view override returns (bool) {
        return _isApprovedOrOwner(spender, tokenId);
    }

    function approve(address to, uint256 tokenId)
        public
        override(IERC721Upgradeable, ERC721Upgradeable)
        protectTokenOperation(tokenId)
    {
        super.approve(to, tokenId);
    }

    /// Registry Constants

    function root() public pure returns (uint256) {
        return 0;
    }

    function childIdOf(uint256 tokenId, string calldata label) external pure override returns (uint256) {
        return _childId(tokenId, label);
    }

    function exists(uint256 tokenId) external view override returns (bool) {
        return _exists(tokenId);
    }

    /// Minting

    function mint(
        address to,
        uint256 tokenId,
        string calldata uri
    ) external override onlyMintingManager {
        _mint(to, tokenId, uri);
    }

    function safeMint(
        address to,
        uint256 tokenId,
        string calldata uri
    ) external override onlyMintingManager {
        _safeMint(to, tokenId, uri, '');
    }

    function safeMint(
        address to,
        uint256 tokenId,
        string calldata uri,
        bytes calldata data
    ) external override onlyMintingManager {
        _safeMint(to, tokenId, uri, data);
    }

    function mintWithRecords(
        address to,
        uint256 tokenId,
        string calldata uri,
        string[] calldata keys,
        string[] calldata values
    ) external override onlyMintingManager {
        _mint(to, tokenId, uri);
        _setMany(keys, values, tokenId);
    }

    function safeMintWithRecords(
        address to,
        uint256 tokenId,
        string calldata uri,
        string[] calldata keys,
        string[] calldata values
    ) external override onlyMintingManager {
        _safeMintWithRecords(to, tokenId, uri, keys, values, '');
    }

    function safeMintWithRecords(
        address to,
        uint256 tokenId,
        string calldata uri,
        string[] calldata keys,
        string[] calldata values,
        bytes calldata data
    ) external override onlyMintingManager {
        _safeMintWithRecords(to, tokenId, uri, keys, values, data);
    }

    /// Transfering

    function setOwner(address to, uint256 tokenId)
        external
        override
        onlyApprovedOrOwner(tokenId)
        protectTokenOperation(tokenId)
    {
        _transfer(ownerOf(tokenId), to, tokenId);
    }

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    )
        public
        override(IERC721Upgradeable, ERC721Upgradeable)
        onlyApprovedOrOwner(tokenId)
        protectTokenOperation(tokenId)
    {
        _reset(tokenId);
        _transfer(from, to, tokenId);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    )
        public
        override(IERC721Upgradeable, ERC721Upgradeable)
        onlyApprovedOrOwner(tokenId)
        protectTokenOperation(tokenId)
    {
        _reset(tokenId);
        _safeTransfer(from, to, tokenId, data);
    }

    /// Burning

    function burn(uint256 tokenId) external override onlyApprovedOrOwner(tokenId) protectTokenOperation(tokenId) {
        _reset(tokenId);
        _burn(tokenId);
    }

    /// Resolution

    function resolverOf(uint256 tokenId) external view override returns (address) {
        return _exists(tokenId) ? address(this) : address(0x0);
    }

    function set(
        string calldata key,
        string calldata value,
        uint256 tokenId
    ) external override onlyApprovedOrOwner(tokenId) protectTokenOperation(tokenId) {
        _set(key, value, tokenId);
    }

    function setMany(
        string[] calldata keys,
        string[] calldata values,
        uint256 tokenId
    ) external override onlyApprovedOrOwner(tokenId) protectTokenOperation(tokenId) {
        _setMany(keys, values, tokenId);
    }

    function setByHash(
        uint256 keyHash,
        string calldata value,
        uint256 tokenId
    ) external override onlyApprovedOrOwner(tokenId) protectTokenOperation(tokenId) {
        _setByHash(keyHash, value, tokenId);
    }

    function setManyByHash(
        uint256[] calldata keyHashes,
        string[] calldata values,
        uint256 tokenId
    ) external override onlyApprovedOrOwner(tokenId) protectTokenOperation(tokenId) {
        _setManyByHash(keyHashes, values, tokenId);
    }

    function reconfigure(
        string[] calldata keys,
        string[] calldata values,
        uint256 tokenId
    ) external override onlyApprovedOrOwner(tokenId) protectTokenOperation(tokenId) {
        _reconfigure(keys, values, tokenId);
    }

    function reset(uint256 tokenId) external override onlyApprovedOrOwner(tokenId) protectTokenOperation(tokenId) {
        _reset(tokenId);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721Upgradeable, IERC165Upgradeable)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }

    /// Internal

    function _childId(uint256 tokenId, string memory label) internal pure returns (uint256) {
        require(bytes(label).length != 0, 'Registry: LABEL_EMPTY');
        return uint256(keccak256(abi.encodePacked(tokenId, keccak256(abi.encodePacked(label)))));
    }

    function _mint(
        address to,
        uint256 tokenId,
        string memory uri
    ) internal {
        _mint(to, tokenId);
        emit NewURI(tokenId, uri);
    }

    function _safeMint(
        address to,
        uint256 tokenId,
        string memory uri,
        bytes memory data
    ) internal {
        _safeMint(to, tokenId, data);
        emit NewURI(tokenId, uri);
    }

    function _safeMintWithRecords(
        address to,
        uint256 tokenId,
        string calldata uri,
        string[] calldata keys,
        string[] calldata values,
        bytes memory data
    ) internal {
        _safeMint(to, tokenId, uri, data);
        _setMany(keys, values, tokenId);
    }

    function _baseURI() internal view override(ERC721Upgradeable) returns (string memory) {
        return _prefix;
    }

    function _msgSender() internal view override(ContextUpgradeable, ERC2771RegistryContext) returns (address sender) {
        return super._msgSender();
    }

    function _msgData() internal view override(ContextUpgradeable, ERC2771RegistryContext) returns (bytes calldata) {
        return super._msgData();
    }

    // Reserved storage space to allow for layout changes in the future.
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity ^0.8.0;

/**
 * @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 {ERC1967Proxy-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 || !_initialized, "Initializable: contract is already initialized");

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721Upgradeable.sol";
import "./IERC721ReceiverUpgradeable.sol";
import "./extensions/IERC721MetadataUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../utils/StringsUpgradeable.sol";
import "../../utils/introspection/ERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable {
    using AddressUpgradeable for address;
    using StringsUpgradeable for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping (uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping (address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping (address => mapping (address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    function __ERC721_init(string memory name_, string memory symbol_) internal initializer {
        __Context_init_unchained();
        __ERC165_init_unchained();
        __ERC721_init_unchained(name_, symbol_);
    }

    function __ERC721_init_unchained(string memory name_, string memory symbol_) internal initializer {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {
        return interfaceId == type(IERC721Upgradeable).interfaceId
            || interfaceId == type(IERC721MetadataUpgradeable).interfaceId
            || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0
            ? string(abi.encodePacked(baseURI, tokenId.toString()))
            : '';
    }

    /**
     * @dev Base URI for computing {tokenURI}. Empty by default, can be overriden
     * in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721Upgradeable.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @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.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721Upgradeable.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory _data) internal virtual {
        _mint(to, tokenId);
        require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721Upgradeable.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        private returns (bool)
    {
        if (to.isContract()) {
            try IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721ReceiverUpgradeable(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    // solhint-disable-next-line no-inline-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { }
    uint256[44] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^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 ^0.8.0;
import "../proxy/utils/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 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) {
        return msg.sender;
    }

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

// @author Unstoppable Domains, Inc.
// @date June 16th, 2021

pragma solidity ^0.8.0;

import '@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721MetadataUpgradeable.sol';

import './IRecordStorage.sol';

interface IUNSRegistry is IERC721MetadataUpgradeable, IRecordStorage {
    event NewURI(uint256 indexed tokenId, string uri);

    event NewURIPrefix(string prefix);

    /**
     * @dev Function to set the token URI Prefix for all tokens.
     * @param prefix string URI to assign
     */
    function setTokenURIPrefix(string calldata prefix) external;

    /**
     * @dev Returns whether the given spender can transfer a given token ID.
     * @param spender address of the spender to query
     * @param tokenId uint256 ID of the token to be transferred
     * @return bool whether the msg.sender is approved for the given token ID,
     * is an operator of the owner, or is the owner of the token
     */
    function isApprovedOrOwner(address spender, uint256 tokenId) external view returns (bool);

    /**
     * @dev Gets the resolver of the specified token ID.
     * @param tokenId uint256 ID of the token to query the resolver of
     * @return address currently marked as the resolver of the given token ID
     */
    function resolverOf(uint256 tokenId) external view returns (address);

    /**
     * @dev Provides child token (subdomain) of provided tokenId.
     * @param tokenId uint256 ID of the token
     * @param label label of subdomain (for `aaa.bbb.crypto` it will be `aaa`)
     */
    function childIdOf(uint256 tokenId, string calldata label) external pure returns (uint256);

    /**
     * @dev Existence of token.
     * @param tokenId uint256 ID of the token
     */
    function exists(uint256 tokenId) external view returns (bool);

    /**
     * @dev Transfer domain ownership without resetting domain records.
     * @param to address of new domain owner
     * @param tokenId uint256 ID of the token to be transferred
     */
    function setOwner(address to, uint256 tokenId) external;

    /**
     * @dev Burns `tokenId`. See {ERC721-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 tokenId) external;

    /**
     * @dev Mints token.
     * @param to address to mint the new SLD to.
     * @param tokenId id of token.
     * @param uri domain URI.
     */
    function mint(
        address to,
        uint256 tokenId,
        string calldata uri
    ) external;

    /**
     * @dev Safely mints token.
     * Implements a ERC721Reciever check unlike mint.
     * @param to address to mint the new SLD to.
     * @param tokenId id of token.
     * @param uri domain URI.
     */
    function safeMint(
        address to,
        uint256 tokenId,
        string calldata uri
    ) external;

    /**
     * @dev Safely mints token.
     * Implements a ERC721Reciever check unlike mint.
     * @param to address to mint the new SLD to.
     * @param tokenId id of token.
     * @param uri domain URI.
     * @param data bytes data to send along with a safe transfer check
     */
    function safeMint(
        address to,
        uint256 tokenId,
        string calldata uri,
        bytes calldata data
    ) external;

    /**
     * @dev Mints token with records
     * @param to address to mint the new SLD to
     * @param tokenId id of token
     * @param keys New record keys
     * @param values New record values
     * @param uri domain URI
     */
    function mintWithRecords(
        address to,
        uint256 tokenId,
        string calldata uri,
        string[] calldata keys,
        string[] calldata values
    ) external;

    /**
     * @dev Safely mints token with records
     * @param to address to mint the new SLD to
     * @param tokenId id of token
     * @param keys New record keys
     * @param values New record values
     * @param uri domain URI
     */
    function safeMintWithRecords(
        address to,
        uint256 tokenId,
        string calldata uri,
        string[] calldata keys,
        string[] calldata values
    ) external;

    /**
     * @dev Safely mints token with records
     * @param to address to mint the new SLD to
     * @param tokenId id of token
     * @param keys New record keys
     * @param values New record values
     * @param uri domain URI
     * @param data bytes data to send along with a safe transfer check
     */
    function safeMintWithRecords(
        address to,
        uint256 tokenId,
        string calldata uri,
        string[] calldata keys,
        string[] calldata values,
        bytes calldata data
    ) external;
}

// @author Unstoppable Domains, Inc.
// @date June 16th, 2021

pragma solidity ^0.8.0;

import './IRecordStorage.sol';
import './KeyStorage.sol';

abstract contract RecordStorage is KeyStorage, IRecordStorage {
    /// @dev mapping of presetIds to keyIds to values
    mapping(uint256 => mapping(uint256 => string)) internal _records;

    /// @dev mapping of tokenIds to presetIds
    mapping(uint256 => uint256) internal _tokenPresets;

    function get(string calldata key, uint256 tokenId) external view override returns (string memory value) {
        value = _get(key, tokenId);
    }

    function getMany(string[] calldata keys, uint256 tokenId) external view override returns (string[] memory values) {
        values = new string[](keys.length);
        for (uint256 i = 0; i < keys.length; i++) {
            values[i] = _get(keys[i], tokenId);
        }
    }

    function getByHash(uint256 keyHash, uint256 tokenId)
        external
        view
        override
        returns (string memory key, string memory value)
    {
        (key, value) = _getByHash(keyHash, tokenId);
    }

    function getManyByHash(uint256[] calldata keyHashes, uint256 tokenId)
        external
        view
        override
        returns (string[] memory keys, string[] memory values)
    {
        keys = new string[](keyHashes.length);
        values = new string[](keyHashes.length);
        for (uint256 i = 0; i < keyHashes.length; i++) {
            (keys[i], values[i]) = _getByHash(keyHashes[i], tokenId);
        }
    }

    function _presetOf(uint256 tokenId) internal view virtual returns (uint256) {
        return _tokenPresets[tokenId] == 0 ? tokenId : _tokenPresets[tokenId];
    }

    function _set(
        string calldata key,
        string calldata value,
        uint256 tokenId
    ) internal {
        uint256 keyHash = uint256(keccak256(abi.encodePacked(key)));
        _addKey(keyHash, key);
        _set(keyHash, key, value, tokenId);
    }

    function _setMany(
        string[] calldata keys,
        string[] calldata values,
        uint256 tokenId
    ) internal {
        for (uint256 i = 0; i < keys.length; i++) {
            _set(keys[i], values[i], tokenId);
        }
    }

    function _setByHash(
        uint256 keyHash,
        string calldata value,
        uint256 tokenId
    ) internal {
        require(_existsKey(keyHash), 'RecordStorage: KEY_NOT_FOUND');
        _set(keyHash, getKey(keyHash), value, tokenId);
    }

    function _setManyByHash(
        uint256[] calldata keyHashes,
        string[] calldata values,
        uint256 tokenId
    ) internal {
        for (uint256 i = 0; i < keyHashes.length; i++) {
            _setByHash(keyHashes[i], values[i], tokenId);
        }
    }

    function _reconfigure(
        string[] calldata keys,
        string[] calldata values,
        uint256 tokenId
    ) internal {
        _reset(tokenId);
        _setMany(keys, values, tokenId);
    }

    function _reset(uint256 tokenId) internal {
        _tokenPresets[tokenId] = uint256(keccak256(abi.encodePacked(_presetOf(tokenId))));
        emit ResetRecords(tokenId);
    }

    function _get(string memory key, uint256 tokenId) private view returns (string memory) {
        return _get(uint256(keccak256(abi.encodePacked(key))), tokenId);
    }

    function _getByHash(uint256 keyHash, uint256 tokenId)
        private
        view
        returns (string memory key, string memory value)
    {
        key = getKey(keyHash);
        value = _get(keyHash, tokenId);
    }

    function _get(uint256 keyHash, uint256 tokenId) private view returns (string memory) {
        return _records[_presetOf(tokenId)][keyHash];
    }

    function _set(
        uint256 keyHash,
        string memory key,
        string memory value,
        uint256 tokenId
    ) private {
        if (bytes(_records[_presetOf(tokenId)][keyHash]).length == 0) {
            emit NewKey(tokenId, key, key);
        }

        _records[_presetOf(tokenId)][keyHash] = value;
        emit Set(tokenId, key, value, key, value);
    }
}

// @author Unstoppable Domains, Inc.
// @date June 16th, 2021

pragma solidity ^0.8.0;

import '@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';

/**
 * @dev https://eips.ethereum.org/EIPS/eip-2771[EIP 2771] is a standard for native meta transactions.
 *
 * A base contract to be inherited by any contract that want to receive forwarded transactions.
 * The contract designed to be stateless, it supports a scenario when a inherited contract is
 * TrustedForwarder and Recipient at the same time.
 *
 * The contract supports token based nonce, that is why standard calldata extended by tokenId.
 *
 * Forwarded calldata layout: {bytes:data}{address:from}{uint256:tokenId}
 */
abstract contract ERC2771RegistryContext is Initializable, ContextUpgradeable {
    // solhint-disable-next-line func-name-mixedcase
    function __ERC2771RegistryContext_init() internal initializer {
        __Context_init_unchained();
        __ERC2771RegistryContext_init_unchained();
    }

    // solhint-disable-next-line func-name-mixedcase
    function __ERC2771RegistryContext_init_unchained() internal initializer {}

    /**
     * @dev Return bool whether provided address is the trusted forwarder.
     */
    function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
        return forwarder == address(this);
    }

    /**
     * @dev Return the tokenId of this call.
     * If the call came through our trusted forwarder, return the original tokenId.
     * otherwise, return zero tokenId.
     */
    function _msgToken() internal view virtual returns (uint256 tokenId) {
        if (isTrustedForwarder(msg.sender)) {
            assembly {
                tokenId := calldataload(sub(calldatasize(), 32))
            }
        }
    }

    /**
     * @dev Return the sender of this call.
     * If the call came through our trusted forwarder, return the original sender.
     * otherwise, return `msg.sender`.
     * Should be used in the contract anywhere instead of msg.sender
     */
    function _msgSender() internal view virtual override returns (address sender) {
        if (isTrustedForwarder(msg.sender)) {
            // The assembly code is more direct than the Solidity version using `abi.decode`.
            assembly {
                sender := shr(96, calldataload(sub(calldatasize(), 52)))
            }
        } else {
            return super._msgSender();
        }
    }

    /**
     * @dev Return the data of this call.
     * If the call came through our trusted forwarder, return the original data.
     * otherwise, return `msg.data`.
     * Should be used in the contract anywhere instead of msg.data
     */
    function _msgData() internal view virtual override returns (bytes calldata) {
        if (isTrustedForwarder(msg.sender)) {
            return msg.data[:msg.data.length - 52];
        } else {
            return super._msgData();
        }
    }

    uint256[50] private __gap;
}

// @author Unstoppable Domains, Inc.
// @date June 16th, 2021

pragma solidity ^0.8.0;

import '@openzeppelin/contracts-upgradeable/utils/cryptography/ECDSAUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/utils/cryptography/draft-EIP712Upgradeable.sol';
import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';

/**
 * @dev https://eips.ethereum.org/EIPS/eip-2771[EIP 2771] is a standard for native meta transactions.
 *
 * A base contract to be inherited by any contract that want to forward transactions.
 */
abstract contract RegistryForwarder is Initializable, EIP712Upgradeable {
    using ECDSAUpgradeable for bytes32;

    struct ForwardRequest {
        address from;
        uint256 gas;
        uint256 tokenId;
        uint256 nonce;
        bytes data;
    }

    bytes32 private constant _TYPEHASH =
        keccak256('ForwardRequest(address from,uint256 gas,uint256 tokenId,uint256 nonce,bytes data)');

    mapping(uint256 => uint256) private _nonces;

    // solhint-disable-next-line func-name-mixedcase
    function __RegistryForwarder_init() internal initializer {
        __RegistryForwarder_init_unchained();
    }

    // solhint-disable-next-line func-name-mixedcase
    function __RegistryForwarder_init_unchained() internal initializer {
        __EIP712_init_unchained('RegistryForwarder', '0.0.1');
    }

    /*
     * 0x23b872dd == bytes4(keccak256('transferFrom(address,address,uint256)'))
     */
    function transferFromFor(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata signature
    ) external {
        _executeFor(abi.encodeWithSelector(0x23b872dd, from, to, tokenId), tokenId, signature);
    }

    /*
     * 0x42842e0e == bytes4(keccak256('safeTransferFrom(address,address,uint256)'))
     */
    function safeTransferFromFor(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata signature
    ) external {
        _executeFor(abi.encodeWithSelector(0x42842e0e, from, to, tokenId), tokenId, signature);
    }

    /*
     * 0xb88d4fde == bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)'))
     */
    function safeTransferFromFor(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data,
        bytes calldata signature
    ) external {
        _executeFor(abi.encodeWithSelector(0xb88d4fde, from, to, tokenId, data), tokenId, signature);
    }

    /*
     * 0x42966c68 == bytes4(keccak256('burn(uint256)'))
     */
    function burnFor(uint256 tokenId, bytes calldata signature) external {
        _executeFor(abi.encodeWithSelector(0x42966c68, tokenId), tokenId, signature);
    }

    /*
     * 0x310bd74b == bytes4(keccak256('reset(uint256)'))
     */
    function resetFor(uint256 tokenId, bytes calldata signature) external {
        _executeFor(abi.encodeWithSelector(0x310bd74b, tokenId), tokenId, signature);
    }

    /*
     * 0x47c81699 == bytes4(keccak256('set(string,string,uint256)'))
     */
    function setFor(
        string calldata key,
        string calldata value,
        uint256 tokenId,
        bytes calldata signature
    ) external {
        _executeFor(abi.encodeWithSelector(0x47c81699, key, value, tokenId), tokenId, signature);
    }

    /*
     * 0xce92b33e == bytes4(keccak256('setMany(string[],string[],uint256)'))
     */
    function setManyFor(
        string[] calldata keys,
        string[] calldata values,
        uint256 tokenId,
        bytes calldata signature
    ) external {
        _executeFor(abi.encodeWithSelector(0xce92b33e, keys, values, tokenId), tokenId, signature);
    }

    /*
     * 0xec129eea == bytes4(keccak256('reconfigure(string[],string[],uint256)'))
     */
    function reconfigureFor(
        string[] calldata keys,
        string[] calldata values,
        uint256 tokenId,
        bytes calldata signature
    ) public {
        _executeFor(abi.encodeWithSelector(0xec129eea, keys, values, tokenId), tokenId, signature);
    }

    function nonceOf(uint256 tokenId) public view returns (uint256) {
        return _nonces[tokenId];
    }

    function verify(ForwardRequest calldata req, bytes calldata signature) public view returns (bool) {
        address signer =
            _hashTypedDataV4(
                keccak256(abi.encode(_TYPEHASH, req.from, req.gas, req.tokenId, req.nonce, keccak256(req.data)))
            )
                .recover(signature);
        return _nonces[req.tokenId] == req.nonce && signer == req.from;
    }

    function execute(ForwardRequest calldata req, bytes calldata signature) public returns (bool, bytes memory) {
        require(verify(req, signature), 'RegistryForwarder: SIGNATURE_INVALID');
        _nonces[req.tokenId] = req.nonce + 1;

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) =
            address(this).call{gas: req.gas}(abi.encodePacked(req.data, req.from, req.tokenId));
        // Validate that the relayer has sent enough gas for the call.
        // See https://ronan.eth.link/blog/ethereum-gas-dangers/
        assert(gasleft() > req.gas / 63);

        return (success, returndata);
    }

    function _recover(
        bytes32 digest,
        uint256 tokenId,
        bytes memory signature
    ) internal returns (address signer) {
        signer = keccak256(abi.encodePacked(digest, address(this), _nonces[tokenId])).toEthSignedMessageHash().recover(
            signature
        );
        _invalidateNonce(tokenId);
    }

    function _invalidateNonce(uint256 tokenId) internal {
        _nonces[tokenId] = _nonces[tokenId] + 1;
    }

    function _executeFor(
        bytes memory data,
        uint256 tokenId,
        bytes memory signature
    ) private returns (bytes memory) {
        uint256 gas = gasleft();
        address from = _recover(keccak256(data), tokenId, signature);

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(this).call{gas: gas}(abi.encodePacked(data, from, tokenId));
        // Validate that the relayer has sent enough gas for the call.
        // See https://ronan.eth.link/blog/ethereum-gas-dangers/
        assert(gasleft() > gas / 63);

        return _verifyCallResult(success, returndata, 'RegistryForwarder: CALL_FAILED');
    }

    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);
            }
        }
    }

    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../../utils/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 ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721ReceiverUpgradeable {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721MetadataUpgradeable is IERC721Upgradeable {

    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant alphabet = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = alphabet[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
    function __ERC165_init() internal initializer {
        __ERC165_init_unchained();
    }

    function __ERC165_init_unchained() internal initializer {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165Upgradeable).interfaceId;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^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);
}

// @author Unstoppable Domains, Inc.
// @date June 16th, 2021

pragma solidity ^0.8.0;

import './IRecordReader.sol';

interface IRecordStorage is IRecordReader {
    event Set(uint256 indexed tokenId, string indexed keyIndex, string indexed valueIndex, string key, string value);

    event NewKey(uint256 indexed tokenId, string indexed keyIndex, string key);

    event ResetRecords(uint256 indexed tokenId);

    /**
     * @dev Set record by key
     * @param key The key set the value of
     * @param value The value to set key to
     * @param tokenId ERC-721 token id to set
     */
    function set(
        string calldata key,
        string calldata value,
        uint256 tokenId
    ) external;

    /**
     * @dev Set records by keys
     * @param keys The keys set the values of
     * @param values Records values
     * @param tokenId ERC-721 token id of the domain
     */
    function setMany(
        string[] memory keys,
        string[] memory values,
        uint256 tokenId
    ) external;

    /**
     * @dev Set record by key hash
     * @param keyHash The key hash set the value of
     * @param value The value to set key to
     * @param tokenId ERC-721 token id to set
     */
    function setByHash(
        uint256 keyHash,
        string calldata value,
        uint256 tokenId
    ) external;

    /**
     * @dev Set records by key hashes
     * @param keyHashes The key hashes set the values of
     * @param values Records values
     * @param tokenId ERC-721 token id of the domain
     */
    function setManyByHash(
        uint256[] calldata keyHashes,
        string[] calldata values,
        uint256 tokenId
    ) external;

    /**
     * @dev Reset all domain records and set new ones
     * @param keys New record keys
     * @param values New record values
     * @param tokenId ERC-721 token id of the domain
     */
    function reconfigure(
        string[] memory keys,
        string[] memory values,
        uint256 tokenId
    ) external;

    /**
     * @dev Function to reset all existing records on a domain.
     * @param tokenId ERC-721 token id to set.
     */
    function reset(uint256 tokenId) external;
}

// @author Unstoppable Domains, Inc.
// @date June 16th, 2021

pragma solidity ^0.8.0;

interface IRecordReader {
    /**
     * @dev Function to get record.
     * @param key The key to query the value of.
     * @param tokenId The token id to fetch.
     * @return The value string.
     */
    function get(string calldata key, uint256 tokenId) external view returns (string memory);

    /**
     * @dev Function to get multiple record.
     * @param keys The keys to query the value of.
     * @param tokenId The token id to fetch.
     * @return The values.
     */
    function getMany(string[] calldata keys, uint256 tokenId) external view returns (string[] memory);

    /**
     * @dev Function get value by provied key hash.
     * @param keyHash The key to query the value of.
     * @param tokenId The token id to set.
     */
    function getByHash(uint256 keyHash, uint256 tokenId) external view returns (string memory key, string memory value);

    /**
     * @dev Function get values by provied key hashes.
     * @param keyHashes The key to query the value of.
     * @param tokenId The token id to set.
     */
    function getManyByHash(uint256[] calldata keyHashes, uint256 tokenId)
        external
        view
        returns (string[] memory keys, string[] memory values);
}

// @author Unstoppable Domains, Inc.
// @date June 16th, 2021

pragma solidity ^0.8.0;

abstract contract KeyStorage {
    mapping(uint256 => string) private _keys;

    function getKey(uint256 keyHash) public view returns (string memory) {
        return _keys[keyHash];
    }

    function getKeys(uint256[] calldata hashes) public view returns (string[] memory values) {
        values = new string[](hashes.length);
        for (uint256 i = 0; i < hashes.length; i++) {
            values[i] = getKey(hashes[i]);
        }
    }

    function addKey(string memory key) external {
        _addKey(uint256(keccak256(abi.encodePacked(key))), key);
    }

    function _existsKey(uint256 keyHash) internal view returns (bool) {
        return bytes(_keys[keyHash]).length > 0;
    }

    function _addKey(uint256 keyHash, string memory key) internal {
        if (!_existsKey(keyHash)) {
            _keys[keyHash] = key;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSAUpgradeable {
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        // Divide the signature in r, s and v variables
        bytes32 r;
        bytes32 s;
        uint8 v;

        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            // solhint-disable-next-line no-inline-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
        } else if (signature.length == 64) {
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            // solhint-disable-next-line no-inline-assembly
            assembly {
                let vs := mload(add(signature, 0x40))
                r := mload(add(signature, 0x20))
                s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
                v := add(shr(255, vs), 27)
            }
        } else {
            revert("ECDSA: invalid signature length");
        }

        return recover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");
        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        require(signer != address(0), "ECDSA: invalid signature");

        return signer;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./ECDSAUpgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712Upgradeable is Initializable {
    /* solhint-disable var-name-mixedcase */
    bytes32 private _HASHED_NAME;
    bytes32 private _HASHED_VERSION;
    bytes32 private constant _TYPE_HASH = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    function __EIP712_init(string memory name, string memory version) internal initializer {
        __EIP712_init_unchained(name, version);
    }

    function __EIP712_init_unchained(string memory name, string memory version) internal initializer {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        return _buildDomainSeparator(_TYPE_HASH, _EIP712NameHash(), _EIP712VersionHash());
    }

    function _buildDomainSeparator(bytes32 typeHash, bytes32 name, bytes32 version) private view returns (bytes32) {
        return keccak256(
            abi.encode(
                typeHash,
                name,
                version,
                block.chainid,
                address(this)
            )
        );
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSAUpgradeable.toTypedDataHash(_domainSeparatorV4(), structHash);
    }

    /**
     * @dev The hash of the name parameter for the EIP712 domain.
     *
     * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs
     * are a concern.
     */
    function _EIP712NameHash() internal virtual view returns (bytes32) {
        return _HASHED_NAME;
    }

    /**
     * @dev The hash of the version parameter for the EIP712 domain.
     *
     * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs
     * are a concern.
     */
    function _EIP712VersionHash() internal virtual view returns (bytes32) {
        return _HASHED_VERSION;
    }
    uint256[50] private __gap;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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RegistryForwarder.ForwardRequest","name":"req","type":"tuple"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"verify","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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