// File: contracts/deploy.sol



pragma solidity >=0.8.0;

import "@ensdomains/ens-contracts/contracts/resolvers/PublicResolver.sol";
import "@ensdomains/ens-contracts/contracts/resolvers/Resolver.sol";
import "@ensdomains/ens-contracts/contracts/root/Controllable.sol";
import "@ensdomains/ens-contracts/contracts/registry/ENSRegistry.sol";
import "@ensdomains/ens-contracts/contracts/registry/ENS.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

interface IBaseRegistrar is IERC721 {
    event ControllerAdded(address indexed controller);
    event ControllerRemoved(address indexed controller);
    event NameMigrated(
        uint256 indexed id,
        address indexed owner,
        uint256 expires
    );
    event NameRegistered(
        uint256 indexed id,
        address indexed owner,
        uint256 expires
    );
    event NameRenewed(uint256 indexed id, uint256 expires);

    // Authorises a controller, who can register and renew domains.
    function addController(address controller) external;

    // Revoke controller permission for an address.
    function removeController(address controller) external;

    // Set the resolver for the TLD this registrar manages.
    function setResolver(address resolver) external;

    // Returns the expiration timestamp of the specified label hash.
    function nameExpires(uint256 id) external view returns (uint256);

    // Returns true iff the specified name is available for registration.
    function available(uint256 id) external view returns (bool);

    /**
     * @dev Register a name.
     */
    function register(
        uint256 id,
        address owner,
        uint256 duration,
        bool avoidable
    ) external returns (uint256);

    function renew(uint256 id, uint256 duration) external returns (uint256);
}

contract Registrar is ERC721, IBaseRegistrar, Ownable {

    using Strings for uint256;

    // A map of expiry times
    mapping(uint256 => uint256) expiries;
    // The ENS registry
    ENS public ens;
    // The namehash of the TLD this registrar owns (eg, .eth)
    bytes32 public baseNode;
    // A map of addresses that are authorised to register and renew names.
    mapping(address => bool) public controllers;

    string private baseURI;


    uint256 public constant GRACE_PERIOD = 90 days;
    bytes4 private constant INTERFACE_META_ID =
        bytes4(keccak256("supportsInterface(bytes4)"));
    bytes4 private constant ERC721_ID =
        bytes4(
            keccak256("balanceOf(address)") ^
                keccak256("ownerOf(uint256)") ^
                keccak256("approve(address,uint256)") ^
                keccak256("getApproved(uint256)") ^
                keccak256("setApprovalForAll(address,bool)") ^
                keccak256("isApprovedForAll(address,address)") ^
                keccak256("transferFrom(address,address,uint256)") ^
                keccak256("safeTransferFrom(address,address,uint256)") ^
                keccak256("safeTransferFrom(address,address,uint256,bytes)")
        );
    bytes4 private constant RECLAIM_ID =
        bytes4(keccak256("reclaim(uint256,address)"));

    /**
     * v2.1.3 version of _isApprovedOrOwner which calls ownerOf(tokenId) and takes grace period into consideration instead of ERC721.ownerOf(tokenId);
     * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.1.3/contracts/token/ERC721/ERC721.sol#L187
     * @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)
        internal
        view
        override
        returns (bool)
    {
        address owner = ownerOf(tokenId);
        return (spender == owner ||
            getApproved(tokenId) == spender ||
            isApprovedForAll(owner, spender));
    }

    function namehash(bytes32 node, bytes32 label) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(node, label));
    }
    
    constructor(address _ens, bytes32 _baseNode) ERC721("ART Ethereum Name Service", "ART") {
        ens = ENS(_ens);
        baseNode = _baseNode;
    }

    function reconfigure(address _ens, bytes32 _baseNode) public virtual onlyOwner{
        ens = ENS(_ens);
        baseNode = _baseNode;
    }

    modifier live() {
        require(ens.owner(baseNode) == address(this));
        _;
    }

    modifier onlyController() {
        require(controllers[msg.sender]);
        _;
    }

    // Authorises a controller, who can register and renew domains.
    function addController(address controller) external override onlyOwner {
        controllers[controller] = true;
        emit ControllerAdded(controller);
    }

    // Revoke controller permission for an address.
    function removeController(address controller) external override onlyOwner {
        controllers[controller] = false;
        emit ControllerRemoved(controller);
    }

    // Set the resolver for the TLD this registrar manages.
    function setResolver(address resolver) external override onlyOwner {
        ens.setResolver(baseNode, resolver);
    }

    // Returns the expiration timestamp of the specified id.
    function nameExpires(uint256 id) external view override returns (uint256) {
        return expiries[id];
    }

    // Returns true iff the specified name is available for registration.
    function available(uint256 id) public view override returns (bool) {
        // Not available if it's registered here or in its grace period.
        return expiries[id] + GRACE_PERIOD < block.timestamp;
    }

    /**
     * @dev Register a name.
     * @param id The token ID (keccak256 of the label).
     * @param owner The address that should own the registration.
     * @param duration Duration in seconds for the registration.
     */
    function register(
        uint256 id,
        address owner,
        uint256 duration,
        bool avoidable
    ) external returns (uint256) {
        return _register(id, owner, duration, avoidable);
    }

    function _register(
        uint256 id,
        address owner,
        uint256 duration,
        bool avoidable
    ) internal live onlyController returns (uint256) {
        require(available(id));
        require(
            block.timestamp + duration + GRACE_PERIOD >
                block.timestamp + GRACE_PERIOD
        ); // Prevent future 

        if (_exists(id)) {
            // Name was previously owned, and expired
            _burn(id);
        }

        if (avoidable){
            expiries[id] = 0;
        }else{
            expiries[id] = block.timestamp + duration;        
        }
        
        _mint(owner, id);
        
        ens.setSubnodeOwner(baseNode, bytes32(id), owner);
        
        emit NameRegistered(id, owner, block.timestamp + duration);

        return block.timestamp + duration;
    }

    function renew(uint256 id, uint256 duration)
        external
        override
        live
        onlyController
        returns (uint256)
    {
        require(expiries[id] + GRACE_PERIOD >= block.timestamp); // Name must be registered here or in grace period
        require(
            expiries[id] + duration + GRACE_PERIOD > duration + GRACE_PERIOD
        ); // Prevent future overflow

        expiries[id] += duration;
        emit NameRenewed(id, expiries[id]);
        return expiries[id];
    }

    /**
     * @dev Reclaim ownership of a name in ENS, if you own it in the registrar.
     */
    function reclaim(uint256 id, address owner) external  live {
        require(_isApprovedOrOwner(msg.sender, id));
        ens.setSubnodeOwner(baseNode, bytes32(id), owner);
    }

    function setBaseURI(string memory uri) public virtual onlyOwner{
        baseURI = uri;
    }

    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    function ownerOf(uint256 tokenId)
        public
        view
        override(IERC721, ERC721)
        returns (address)
    {
        require(expiries[tokenId] > block.timestamp);
        return super.ownerOf(tokenId);
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        override(ERC721, IERC165)
        returns (bool)
    {
        return
            interfaceID == INTERFACE_META_ID ||
            interfaceID == ERC721_ID ||
            interfaceID == RECLAIM_ID;
    }
}


import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

/**
 * @dev A registrar controller for registering and renewing names at fixed cost.
 */
contract RegistrarController is Ownable {
    using ECDSA for bytes32;

    Registrar base;
    
    event NameRegistered(string name, bytes32 indexed label, address indexed owner, uint cost, uint expires);
    event NameRenewed(string name, bytes32 indexed label, uint cost, uint expires);
    event NewPriceOracle(address indexed oracle);


    address[] private witnesses;

    address private pool;

    constructor(address _base) { 
        base = Registrar(_base);
        pool = msg.sender;
    }

    function setWitnesses(address[] memory _witnesses) public onlyOwner{
        witnesses = _witnesses;
    }

    function setPool(address _pool) public virtual onlyOwner{
        pool = _pool;
    }


    function setRegistrar(address _registrar) public onlyOwner{
        base = Registrar(_registrar);
    }

    function verifyRenew(uint256 id, uint256 price, uint256 duration, uint256 timelock, bytes[] calldata signatures) internal view returns(bool){
        require(timelock>=block.timestamp, "RegistrarController: Call expired");
        for (uint i = 0; i<witnesses.length; i++){
            if (keccak256(abi.encode(id, price,duration,timelock)).toEthSignedMessageHash().recover(signatures[i])!=witnesses[i]){
                return false;
            }
        }
        return true;
    }

    function verifyRegister(uint256 id, address owner, uint256 price, uint256 duration, bool avoidable, address resolver, address addr, uint256 timelock, bytes[] calldata signatures) internal view returns(bool){
        require(timelock>=block.timestamp, "RegistrarController: Call expired");
        for (uint i = 0; i<witnesses.length; i++){
            if (keccak256(abi.encode(id, owner, price, duration, avoidable, resolver, addr, timelock)).toEthSignedMessageHash().recover(signatures[i])!=witnesses[i]){
                return false;
            }
        }
        return true;
    }

    function register(
        string memory name,
        address owner,
        uint256 price,
        uint256 duration,
        bool avoidable,
        address resolver,
        address addr,
        uint256 timelock,
        bytes[] calldata signatures
    ) public payable {
     
       
        bytes32 label = keccak256(bytes(name));
        uint256 tokenId = uint256(label);
        
        require(verifyRegister(tokenId, owner, price, duration, avoidable, resolver, addr, timelock, signatures), "Registrar: Invalid signature");
        require(msg.value==price, "Registrar: Wrong eth value");
        require(payable(pool).send(price), "Registrar: Failed to send eth");
        
        uint expires;
        if(resolver != address(0)) {
            // Set this contract as the (temporary) owner, giving it
            // permission to set up the resolver.
            base.register(tokenId, address(this), duration, true );

            // The nodehash of this label
            bytes32 nodehash = keccak256(abi.encodePacked(base.baseNode(), label));

            // Set the resolver
            base.ens().setResolver(nodehash, resolver);

            // Configure the resolver
            if (addr != address(0)) {
                Resolver(resolver).setAddr(nodehash, addr);
            }

            // Now transfer full ownership to the expeceted owner
            expires = base.register(tokenId, owner, duration, avoidable);

        } else {
            require(addr == address(0));
            expires = base.register(tokenId, owner, duration, avoidable);
        }
        
        emit NameRegistered(name, label, owner, price, expires);


    }

    function renew(string calldata name, uint256 price, uint256 duration, uint256 timelock, bytes[] calldata signatures) external payable {

        bytes32 label = keccak256(bytes(name));
        uint256 tokenId = uint256(label);

        require(verifyRenew(tokenId, price, duration, timelock, signatures), "Registrar: Invalid signature");
        require(msg.value==price, "Registrar: Wrong eth value");
        require(payable(pool).send(price), "Registrar: Failed to send eth");
        
        uint expires = base.renew(tokenId, duration);

        emit NameRenewed(name, label, price, expires);
    }
}


// File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.3) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @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 ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. 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.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @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) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // 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 (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): 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.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @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) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @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 Message, created from `s`. 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(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @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));
    }
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

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 IERC165 {
    /**
     * @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);
}

// File: @openzeppelin/contracts/utils/Strings.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @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] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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 Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.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 Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.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 ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings 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.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        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: invalid token ID");
        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) {
        _requireMinted(tokenId);

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

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden 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 = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

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

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_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: caller is not token 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: caller is not token 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) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == 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);

        _afterTokenTransfer(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 = ERC721.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);

        _afterTokenTransfer(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(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        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);

        _afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @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 IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-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` and `to` are never both zero.
     *
     * 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 {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

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 IERC721Receiver {
    /**
     * @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 `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @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);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @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`.
     *
     * 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;

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

    /**
     * @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);
}

// File: @ensdomains/ens-contracts/contracts/registry/ENS.sol



pragma solidity >=0.8.4;

interface ENS {
    // Logged when the owner of a node assigns a new owner to a subnode.
    event NewOwner(bytes32 indexed node, bytes32 indexed label, address owner);

    // Logged when the owner of a node transfers ownership to a new account.
    event Transfer(bytes32 indexed node, address owner);

    // Logged when the resolver for a node changes.
    event NewResolver(bytes32 indexed node, address resolver);

    // Logged when the TTL of a node changes
    event NewTTL(bytes32 indexed node, uint64 ttl);

    // Logged when an operator is added or removed.
    event ApprovalForAll(
        address indexed owner,
        address indexed operator,
        bool approved
    );

    function setRecord(
        bytes32 node,
        address owner,
        address resolver,
        uint64 ttl
    ) external;

    function setSubnodeRecord(
        bytes32 node,
        bytes32 label,
        address owner,
        address resolver,
        uint64 ttl
    ) external;

    function setSubnodeOwner(
        bytes32 node,
        bytes32 label,
        address owner
    ) external returns (bytes32);

    function setResolver(bytes32 node, address resolver) external;

    function setOwner(bytes32 node, address owner) external;

    function setTTL(bytes32 node, uint64 ttl) external;

    function setApprovalForAll(address operator, bool approved) external;

    function owner(bytes32 node) external view returns (address);

    function resolver(bytes32 node) external view returns (address);

    function ttl(bytes32 node) external view returns (uint64);

    function recordExists(bytes32 node) external view returns (bool);

    function isApprovedForAll(address owner, address operator)
        external
        view
        returns (bool);
}

// File: @ensdomains/ens-contracts/contracts/registry/ENSRegistry.sol



pragma solidity >=0.8.4;

import "./ENS.sol";

/**
 * The ENS registry contract.
 */
contract ENSRegistry is ENS {
    struct Record {
        address owner;
        address resolver;
        uint64 ttl;
    }

    mapping(bytes32 => Record) records;
    mapping(address => mapping(address => bool)) operators;

    // Permits modifications only by the owner of the specified node.
    modifier authorised(bytes32 node) {
        address owner = records[node].owner;
        require(owner == msg.sender || operators[owner][msg.sender]);
        _;
    }

    /**
     * @dev Constructs a new ENS registry.
     */
    constructor() public {
        records[0x0].owner = msg.sender;
    }

    /**
     * @dev Sets the record for a node.
     * @param node The node to update.
     * @param owner The address of the new owner.
     * @param resolver The address of the resolver.
     * @param ttl The TTL in seconds.
     */
    function setRecord(
        bytes32 node,
        address owner,
        address resolver,
        uint64 ttl
    ) external virtual override {
        setOwner(node, owner);
        _setResolverAndTTL(node, resolver, ttl);
    }

    /**
     * @dev Sets the record for a subnode.
     * @param node The parent node.
     * @param label The hash of the label specifying the subnode.
     * @param owner The address of the new owner.
     * @param resolver The address of the resolver.
     * @param ttl The TTL in seconds.
     */
    function setSubnodeRecord(
        bytes32 node,
        bytes32 label,
        address owner,
        address resolver,
        uint64 ttl
    ) external virtual override {
        bytes32 subnode = setSubnodeOwner(node, label, owner);
        _setResolverAndTTL(subnode, resolver, ttl);
    }

    /**
     * @dev Transfers ownership of a node to a new address. May only be called by the current owner of the node.
     * @param node The node to transfer ownership of.
     * @param owner The address of the new owner.
     */
    function setOwner(bytes32 node, address owner)
        public
        virtual
        override
        authorised(node)
    {
        _setOwner(node, owner);
        emit Transfer(node, owner);
    }

    /**
     * @dev Transfers ownership of a subnode keccak256(node, label) to a new address. May only be called by the owner of the parent node.
     * @param node The parent node.
     * @param label The hash of the label specifying the subnode.
     * @param owner The address of the new owner.
     */
    function setSubnodeOwner(
        bytes32 node,
        bytes32 label,
        address owner
    ) public virtual override authorised(node) returns (bytes32) {
        bytes32 subnode = keccak256(abi.encodePacked(node, label));
        _setOwner(subnode, owner);
        emit NewOwner(node, label, owner);
        return subnode;
    }

    /**
     * @dev Sets the resolver address for the specified node.
     * @param node The node to update.
     * @param resolver The address of the resolver.
     */
    function setResolver(bytes32 node, address resolver)
        public
        virtual
        override
        authorised(node)
    {
        emit NewResolver(node, resolver);
        records[node].resolver = resolver;
    }

    /**
     * @dev Sets the TTL for the specified node.
     * @param node The node to update.
     * @param ttl The TTL in seconds.
     */
    function setTTL(bytes32 node, uint64 ttl)
        public
        virtual
        override
        authorised(node)
    {
        emit NewTTL(node, ttl);
        records[node].ttl = ttl;
    }

    /**
     * @dev Enable or disable approval for a third party ("operator") to manage
     *  all of `msg.sender`'s ENS records. Emits the ApprovalForAll event.
     * @param operator Address to add to the set of authorized operators.
     * @param approved True if the operator is approved, false to revoke approval.
     */
    function setApprovalForAll(address operator, bool approved)
        external
        virtual
        override
    {
        operators[msg.sender][operator] = approved;
        emit ApprovalForAll(msg.sender, operator, approved);
    }

    /**
     * @dev Returns the address that owns the specified node.
     * @param node The specified node.
     * @return address of the owner.
     */
    function owner(bytes32 node)
        public
        view
        virtual
        override
        returns (address)
    {
        address addr = records[node].owner;
        if (addr == address(this)) {
            return address(0x0);
        }

        return addr;
    }

    /**
     * @dev Returns the address of the resolver for the specified node.
     * @param node The specified node.
     * @return address of the resolver.
     */
    function resolver(bytes32 node)
        public
        view
        virtual
        override
        returns (address)
    {
        return records[node].resolver;
    }

    /**
     * @dev Returns the TTL of a node, and any records associated with it.
     * @param node The specified node.
     * @return ttl of the node.
     */
    function ttl(bytes32 node) public view virtual override returns (uint64) {
        return records[node].ttl;
    }

    /**
     * @dev Returns whether a record has been imported to the registry.
     * @param node The specified node.
     * @return Bool if record exists
     */
    function recordExists(bytes32 node)
        public
        view
        virtual
        override
        returns (bool)
    {
        return records[node].owner != address(0x0);
    }

    /**
     * @dev Query if an address is an authorized operator for another address.
     * @param owner The address that owns the records.
     * @param operator The address that acts on behalf of the owner.
     * @return True if `operator` is an approved operator for `owner`, false otherwise.
     */
    function isApprovedForAll(address owner, address operator)
        external
        view
        virtual
        override
        returns (bool)
    {
        return operators[owner][operator];
    }

    function _setOwner(bytes32 node, address owner) internal virtual {
        records[node].owner = owner;
    }

    function _setResolverAndTTL(
        bytes32 node,
        address resolver,
        uint64 ttl
    ) internal {
        if (resolver != records[node].resolver) {
            records[node].resolver = resolver;
            emit NewResolver(node, resolver);
        }

        if (ttl != records[node].ttl) {
            records[node].ttl = ttl;
            emit NewTTL(node, ttl);
        }
    }
}

// File: @ensdomains/ens-contracts/contracts/root/Controllable.sol



pragma solidity ^0.8.4;

import "@openzeppelin/contracts/access/Ownable.sol";

contract Controllable is Ownable {
    mapping(address => bool) public controllers;

    event ControllerChanged(address indexed controller, bool enabled);

    modifier onlyController() {
        require(
            controllers[msg.sender],
            "Controllable: Caller is not a controller"
        );
        _;
    }

    function setController(address controller, bool enabled) public onlyOwner {
        controllers[controller] = enabled;
        emit ControllerChanged(controller, enabled);
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/Resolver.sol



//SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import "./profiles/IABIResolver.sol";
import "./profiles/IAddressResolver.sol";
import "./profiles/IAddrResolver.sol";
import "./profiles/IContentHashResolver.sol";
import "./profiles/IDNSRecordResolver.sol";
import "./profiles/IDNSZoneResolver.sol";
import "./profiles/IInterfaceResolver.sol";
import "./profiles/INameResolver.sol";
import "./profiles/IPubkeyResolver.sol";
import "./profiles/ITextResolver.sol";
import "./profiles/IExtendedResolver.sol";

/**
 * A generic resolver interface which includes all the functions including the ones deprecated
 */
interface Resolver is
    IERC165,
    IABIResolver,
    IAddressResolver,
    IAddrResolver,
    IContentHashResolver,
    IDNSRecordResolver,
    IDNSZoneResolver,
    IInterfaceResolver,
    INameResolver,
    IPubkeyResolver,
    ITextResolver,
    IExtendedResolver
{
    /* Deprecated events */
    event ContentChanged(bytes32 indexed node, bytes32 hash);

    function setABI(
        bytes32 node,
        uint256 contentType,
        bytes calldata data
    ) external;

    function setAddr(bytes32 node, address addr) external;

    function setAddr(
        bytes32 node,
        uint256 coinType,
        bytes calldata a
    ) external;

    function setContenthash(bytes32 node, bytes calldata hash) external;

    function setDnsrr(bytes32 node, bytes calldata data) external;

    function setName(bytes32 node, string calldata _name) external;

    function setPubkey(
        bytes32 node,
        bytes32 x,
        bytes32 y
    ) external;

    function setText(
        bytes32 node,
        string calldata key,
        string calldata value
    ) external;

    function setInterface(
        bytes32 node,
        bytes4 interfaceID,
        address implementer
    ) external;

    function multicall(bytes[] calldata data)
        external
        returns (bytes[] memory results);

    function multicallWithNodeCheck(bytes32 nodehash, bytes[] calldata data)
        external
        returns (bytes[] memory results);

    /* Deprecated functions */
    function content(bytes32 node) external view returns (bytes32);

    function multihash(bytes32 node) external view returns (bytes memory);

    function setContent(bytes32 node, bytes32 hash) external;

    function setMultihash(bytes32 node, bytes calldata hash) external;
}

// File: @ensdomains/ens-contracts/contracts/resolvers/PublicResolver.sol



//SPDX-License-Identifier: MIT
pragma solidity >=0.8.17 <0.9.0;

import "../registry/ENS.sol";
import "./profiles/ABIResolver.sol";
import "./profiles/AddrResolver.sol";
import "./profiles/ContentHashResolver.sol";
import "./profiles/DNSResolver.sol";
import "./profiles/InterfaceResolver.sol";
import "./profiles/NameResolver.sol";
import "./profiles/PubkeyResolver.sol";
import "./profiles/TextResolver.sol";
import "./Multicallable.sol";

interface INameWrapper {
    function ownerOf(uint256 id) external view returns (address);
}

/**
 * A simple resolver anyone can use; only allows the owner of a node to set its
 * address.
 */
contract PublicResolver is
    Multicallable,
    ABIResolver,
    AddrResolver,
    ContentHashResolver,
    DNSResolver,
    InterfaceResolver,
    NameResolver,
    PubkeyResolver,
    TextResolver
{
    ENS immutable ens;
    INameWrapper immutable nameWrapper;
    address immutable trustedETHController;
    address immutable trustedReverseRegistrar;

    /**
     * A mapping of operators. An address that is authorised for an address
     * may make any changes to the name that the owner could, but may not update
     * the set of authorisations.
     * (owner, operator) => approved
     */
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    // Logged when an operator is added or removed.
    event ApprovalForAll(
        address indexed owner,
        address indexed operator,
        bool approved
    );

    constructor(
        ENS _ens,
        INameWrapper wrapperAddress,
        address _trustedETHController,
        address _trustedReverseRegistrar
    ) {
        ens = _ens;
        nameWrapper = wrapperAddress;
        trustedETHController = _trustedETHController;
        trustedReverseRegistrar = _trustedReverseRegistrar;
    }

    /**
     * @dev See {IERC1155-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) external {
        require(
            msg.sender != operator,
            "ERC1155: setting approval status for self"
        );

        _operatorApprovals[msg.sender][operator] = approved;
        emit ApprovalForAll(msg.sender, operator, approved);
    }

    /**
     * @dev See {IERC1155-isApprovedForAll}.
     */
    function isApprovedForAll(address account, address operator)
        public
        view
        returns (bool)
    {
        return _operatorApprovals[account][operator];
    }

    function isAuthorised(bytes32 node) internal view override returns (bool) {
        if (
            msg.sender == trustedETHController ||
            msg.sender == trustedReverseRegistrar
        ) {
            return true;
        }
        address owner = ens.owner(node);
        if (owner == address(nameWrapper)) {
            owner = nameWrapper.ownerOf(uint256(node));
        }
        return owner == msg.sender || isApprovedForAll(owner, msg.sender);
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        override(
            Multicallable,
            ABIResolver,
            AddrResolver,
            ContentHashResolver,
            DNSResolver,
            InterfaceResolver,
            NameResolver,
            PubkeyResolver,
            TextResolver
        )
        returns (bool)
    {
        return super.supportsInterface(interfaceID);
    }
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.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 ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/IExtendedResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

interface IExtendedResolver {
    function resolve(bytes memory name, bytes memory data)
        external
        view
        returns (bytes memory, address);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/ITextResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

interface ITextResolver {
    event TextChanged(
        bytes32 indexed node,
        string indexed indexedKey,
        string key,
        string value
    );

    /**
     * Returns the text data associated with an ENS node and key.
     * @param node The ENS node to query.
     * @param key The text data key to query.
     * @return The associated text data.
     */
    function text(bytes32 node, string calldata key)
        external
        view
        returns (string memory);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/IPubkeyResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

interface IPubkeyResolver {
    event PubkeyChanged(bytes32 indexed node, bytes32 x, bytes32 y);

    /**
     * Returns the SECP256k1 public key associated with an ENS node.
     * Defined in EIP 619.
     * @param node The ENS node to query
     * @return x The X coordinate of the curve point for the public key.
     * @return y The Y coordinate of the curve point for the public key.
     */
    function pubkey(bytes32 node) external view returns (bytes32 x, bytes32 y);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/INameResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

interface INameResolver {
    event NameChanged(bytes32 indexed node, string name);

    /**
     * Returns the name associated with an ENS node, for reverse records.
     * Defined in EIP181.
     * @param node The ENS node to query.
     * @return The associated name.
     */
    function name(bytes32 node) external view returns (string memory);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/IInterfaceResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

interface IInterfaceResolver {
    event InterfaceChanged(
        bytes32 indexed node,
        bytes4 indexed interfaceID,
        address implementer
    );

    /**
     * Returns the address of a contract that implements the specified interface for this name.
     * If an implementer has not been set for this interfaceID and name, the resolver will query
     * the contract at `addr()`. If `addr()` is set, a contract exists at that address, and that
     * contract implements EIP165 and returns `true` for the specified interfaceID, its address
     * will be returned.
     * @param node The ENS node to query.
     * @param interfaceID The EIP 165 interface ID to check for.
     * @return The address that implements this interface, or 0 if the interface is unsupported.
     */
    function interfaceImplementer(bytes32 node, bytes4 interfaceID)
        external
        view
        returns (address);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/IDNSZoneResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

interface IDNSZoneResolver {
    // DNSZonehashChanged is emitted whenever a given node's zone hash is updated.
    event DNSZonehashChanged(
        bytes32 indexed node,
        bytes lastzonehash,
        bytes zonehash
    );

    /**
     * zonehash obtains the hash for the zone.
     * @param node The ENS node to query.
     * @return The associated contenthash.
     */
    function zonehash(bytes32 node) external view returns (bytes memory);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/IDNSRecordResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

interface IDNSRecordResolver {
    // DNSRecordChanged is emitted whenever a given node/name/resource's RRSET is updated.
    event DNSRecordChanged(
        bytes32 indexed node,
        bytes name,
        uint16 resource,
        bytes record
    );
    // DNSRecordDeleted is emitted whenever a given node/name/resource's RRSET is deleted.
    event DNSRecordDeleted(bytes32 indexed node, bytes name, uint16 resource);

    /**
     * Obtain a DNS record.
     * @param node the namehash of the node for which to fetch the record
     * @param name the keccak-256 hash of the fully-qualified name for which to fetch the record
     * @param resource the ID of the resource as per https://en.wikipedia.org/wiki/List_of_DNS_record_types
     * @return the DNS record in wire format if present, otherwise empty
     */
    function dnsRecord(
        bytes32 node,
        bytes32 name,
        uint16 resource
    ) external view returns (bytes memory);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/IContentHashResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

interface IContentHashResolver {
    event ContenthashChanged(bytes32 indexed node, bytes hash);

    /**
     * Returns the contenthash associated with an ENS node.
     * @param node The ENS node to query.
     * @return The associated contenthash.
     */
    function contenthash(bytes32 node) external view returns (bytes memory);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/IAddrResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

/**
 * Interface for the legacy (ETH-only) addr function.
 */
interface IAddrResolver {
    event AddrChanged(bytes32 indexed node, address a);

    /**
     * Returns the address associated with an ENS node.
     * @param node The ENS node to query.
     * @return The associated address.
     */
    function addr(bytes32 node) external view returns (address payable);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/IAddressResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

/**
 * Interface for the new (multicoin) addr function.
 */
interface IAddressResolver {
    event AddressChanged(
        bytes32 indexed node,
        uint256 coinType,
        bytes newAddress
    );

    function addr(bytes32 node, uint256 coinType)
        external
        view
        returns (bytes memory);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/IABIResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "./IABIResolver.sol";
import "../ResolverBase.sol";

interface IABIResolver {
    event ABIChanged(bytes32 indexed node, uint256 indexed contentType);

    /**
     * Returns the ABI associated with an ENS node.
     * Defined in EIP205.
     * @param node The ENS node to query
     * @param contentTypes A bitwise OR of the ABI formats accepted by the caller.
     * @return contentType The content type of the return value
     * @return data The ABI data
     */
    function ABI(bytes32 node, uint256 contentTypes)
        external
        view
        returns (uint256, bytes memory);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/Multicallable.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "./IMulticallable.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

abstract contract Multicallable is IMulticallable, ERC165 {
    function _multicall(bytes32 nodehash, bytes[] calldata data)
        internal
        returns (bytes[] memory results)
    {
        results = new bytes[](data.length);
        for (uint256 i = 0; i < data.length; i++) {
            if (nodehash != bytes32(0)) {
                bytes32 txNamehash = bytes32(data[i][4:36]);
                require(
                    txNamehash == nodehash,
                    "multicall: All records must have a matching namehash"
                );
            }
            (bool success, bytes memory result) = address(this).delegatecall(
                data[i]
            );
            require(success);
            results[i] = result;
        }
        return results;
    }

    // This function provides an extra security check when called
    // from priviledged contracts (such as EthRegistrarController)
    // that can set records on behalf of the node owners
    function multicallWithNodeCheck(bytes32 nodehash, bytes[] calldata data)
        external
        returns (bytes[] memory results)
    {
        return _multicall(nodehash, data);
    }

    function multicall(bytes[] calldata data)
        public
        override
        returns (bytes[] memory results)
    {
        return _multicall(bytes32(0), data);
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            interfaceID == type(IMulticallable).interfaceId ||
            super.supportsInterface(interfaceID);
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/TextResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "../ResolverBase.sol";
import "./ITextResolver.sol";

abstract contract TextResolver is ITextResolver, ResolverBase {
    mapping(uint64 => mapping(bytes32 => mapping(string => string))) versionable_texts;

    /**
     * Sets the text data associated with an ENS node and key.
     * May only be called by the owner of that node in the ENS registry.
     * @param node The node to update.
     * @param key The key to set.
     * @param value The text data value to set.
     */
    function setText(
        bytes32 node,
        string calldata key,
        string calldata value
    ) external virtual authorised(node) {
        versionable_texts[recordVersions[node]][node][key] = value;
        emit TextChanged(node, key, key, value);
    }

    /**
     * Returns the text data associated with an ENS node and key.
     * @param node The ENS node to query.
     * @param key The text data key to query.
     * @return The associated text data.
     */
    function text(bytes32 node, string calldata key)
        external
        view
        virtual
        override
        returns (string memory)
    {
        return versionable_texts[recordVersions[node]][node][key];
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            interfaceID == type(ITextResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/PubkeyResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "../ResolverBase.sol";
import "./IPubkeyResolver.sol";

abstract contract PubkeyResolver is IPubkeyResolver, ResolverBase {
    struct PublicKey {
        bytes32 x;
        bytes32 y;
    }

    mapping(uint64 => mapping(bytes32 => PublicKey)) versionable_pubkeys;

    /**
     * Sets the SECP256k1 public key associated with an ENS node.
     * @param node The ENS node to query
     * @param x the X coordinate of the curve point for the public key.
     * @param y the Y coordinate of the curve point for the public key.
     */
    function setPubkey(
        bytes32 node,
        bytes32 x,
        bytes32 y
    ) external virtual authorised(node) {
        versionable_pubkeys[recordVersions[node]][node] = PublicKey(x, y);
        emit PubkeyChanged(node, x, y);
    }

    /**
     * Returns the SECP256k1 public key associated with an ENS node.
     * Defined in EIP 619.
     * @param node The ENS node to query
     * @return x The X coordinate of the curve point for the public key.
     * @return y The Y coordinate of the curve point for the public key.
     */
    function pubkey(bytes32 node)
        external
        view
        virtual
        override
        returns (bytes32 x, bytes32 y)
    {
        uint64 currentRecordVersion = recordVersions[node];
        return (
            versionable_pubkeys[currentRecordVersion][node].x,
            versionable_pubkeys[currentRecordVersion][node].y
        );
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            interfaceID == type(IPubkeyResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/NameResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "../ResolverBase.sol";
import "./INameResolver.sol";

abstract contract NameResolver is INameResolver, ResolverBase {
    mapping(uint64 => mapping(bytes32 => string)) versionable_names;

    /**
     * Sets the name associated with an ENS node, for reverse records.
     * May only be called by the owner of that node in the ENS registry.
     * @param node The node to update.
     */
    function setName(bytes32 node, string calldata newName)
        external
        virtual
        authorised(node)
    {
        versionable_names[recordVersions[node]][node] = newName;
        emit NameChanged(node, newName);
    }

    /**
     * Returns the name associated with an ENS node, for reverse records.
     * Defined in EIP181.
     * @param node The ENS node to query.
     * @return The associated name.
     */
    function name(bytes32 node)
        external
        view
        virtual
        override
        returns (string memory)
    {
        return versionable_names[recordVersions[node]][node];
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            interfaceID == type(INameResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/InterfaceResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import "../ResolverBase.sol";
import "./AddrResolver.sol";
import "./IInterfaceResolver.sol";

abstract contract InterfaceResolver is IInterfaceResolver, AddrResolver {
    mapping(uint64 => mapping(bytes32 => mapping(bytes4 => address))) versionable_interfaces;

    /**
     * Sets an interface associated with a name.
     * Setting the address to 0 restores the default behaviour of querying the contract at `addr()` for interface support.
     * @param node The node to update.
     * @param interfaceID The EIP 165 interface ID.
     * @param implementer The address of a contract that implements this interface for this node.
     */
    function setInterface(
        bytes32 node,
        bytes4 interfaceID,
        address implementer
    ) external virtual authorised(node) {
        versionable_interfaces[recordVersions[node]][node][interfaceID] = implementer;
        emit InterfaceChanged(node, interfaceID, implementer);
    }

    /**
     * Returns the address of a contract that implements the specified interface for this name.
     * If an implementer has not been set for this interfaceID and name, the resolver will query
     * the contract at `addr()`. If `addr()` is set, a contract exists at that address, and that
     * contract implements EIP165 and returns `true` for the specified interfaceID, its address
     * will be returned.
     * @param node The ENS node to query.
     * @param interfaceID The EIP 165 interface ID to check for.
     * @return The address that implements this interface, or 0 if the interface is unsupported.
     */
    function interfaceImplementer(bytes32 node, bytes4 interfaceID)
        external
        view
        virtual
        override
        returns (address)
    {
        address implementer = versionable_interfaces[recordVersions[node]][node][interfaceID];
        if (implementer != address(0)) {
            return implementer;
        }

        address a = addr(node);
        if (a == address(0)) {
            return address(0);
        }

        (bool success, bytes memory returnData) = a.staticcall(
            abi.encodeWithSignature(
                "supportsInterface(bytes4)",
                type(IERC165).interfaceId
            )
        );
        if (!success || returnData.length < 32 || returnData[31] == 0) {
            // EIP 165 not supported by target
            return address(0);
        }

        (success, returnData) = a.staticcall(
            abi.encodeWithSignature("supportsInterface(bytes4)", interfaceID)
        );
        if (!success || returnData.length < 32 || returnData[31] == 0) {
            // Specified interface not supported by target
            return address(0);
        }

        return a;
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            interfaceID == type(IInterfaceResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/DNSResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "../ResolverBase.sol";
import "../../dnssec-oracle/RRUtils.sol";
import "./IDNSRecordResolver.sol";
import "./IDNSZoneResolver.sol";

abstract contract DNSResolver is
    IDNSRecordResolver,
    IDNSZoneResolver,
    ResolverBase
{
    using RRUtils for *;
    using BytesUtils for bytes;

    // Zone hashes for the domains.
    // A zone hash is an EIP-1577 content hash in binary format that should point to a
    // resource containing a single zonefile.
    // node => contenthash
    mapping(uint64 => mapping(bytes32 => bytes)) private versionable_zonehashes;

    // The records themselves.  Stored as binary RRSETs
    // node => version => name => resource => data
    mapping(uint64 => mapping(bytes32 => mapping(bytes32 => mapping(uint16 => bytes))))
        private versionable_records;

    // Count of number of entries for a given name.  Required for DNS resolvers
    // when resolving wildcards.
    // node => version => name => number of records
    mapping(uint64 => mapping(bytes32 => mapping(bytes32 => uint16)))
        private versionable_nameEntriesCount;

    /**
     * Set one or more DNS records.  Records are supplied in wire-format.
     * Records with the same node/name/resource must be supplied one after the
     * other to ensure the data is updated correctly. For example, if the data
     * was supplied:
     *     a.example.com IN A 1.2.3.4
     *     a.example.com IN A 5.6.7.8
     *     www.example.com IN CNAME a.example.com.
     * then this would store the two A records for a.example.com correctly as a
     * single RRSET, however if the data was supplied:
     *     a.example.com IN A 1.2.3.4
     *     www.example.com IN CNAME a.example.com.
     *     a.example.com IN A 5.6.7.8
     * then this would store the first A record, the CNAME, then the second A
     * record which would overwrite the first.
     *
     * @param node the namehash of the node for which to set the records
     * @param data the DNS wire format records to set
     */
    function setDNSRecords(bytes32 node, bytes calldata data)
        external
        virtual
        authorised(node)
    {
        uint16 resource = 0;
        uint256 offset = 0;
        bytes memory name;
        bytes memory value;
        bytes32 nameHash;
        uint64 version = recordVersions[node];
        // Iterate over the data to add the resource records
        for (
            RRUtils.RRIterator memory iter = data.iterateRRs(0);
            !iter.done();
            iter.next()
        ) {
            if (resource == 0) {
                resource = iter.dnstype;
                name = iter.name();
                nameHash = keccak256(abi.encodePacked(name));
                value = bytes(iter.rdata());
            } else {
                bytes memory newName = iter.name();
                if (resource != iter.dnstype || !name.equals(newName)) {
                    setDNSRRSet(
                        node,
                        name,
                        resource,
                        data,
                        offset,
                        iter.offset - offset,
                        value.length == 0,
                        version
                    );
                    resource = iter.dnstype;
                    offset = iter.offset;
                    name = newName;
                    nameHash = keccak256(name);
                    value = bytes(iter.rdata());
                }
            }
        }
        if (name.length > 0) {
            setDNSRRSet(
                node,
                name,
                resource,
                data,
                offset,
                data.length - offset,
                value.length == 0,
                version
            );
        }
    }

    /**
     * Obtain a DNS record.
     * @param node the namehash of the node for which to fetch the record
     * @param name the keccak-256 hash of the fully-qualified name for which to fetch the record
     * @param resource the ID of the resource as per https://en.wikipedia.org/wiki/List_of_DNS_record_types
     * @return the DNS record in wire format if present, otherwise empty
     */
    function dnsRecord(
        bytes32 node,
        bytes32 name,
        uint16 resource
    ) public view virtual override returns (bytes memory) {
        return versionable_records[recordVersions[node]][node][name][resource];
    }

    /**
     * Check if a given node has records.
     * @param node the namehash of the node for which to check the records
     * @param name the namehash of the node for which to check the records
     */
    function hasDNSRecords(bytes32 node, bytes32 name)
        public
        view
        virtual
        returns (bool)
    {
        return (versionable_nameEntriesCount[recordVersions[node]][node][
            name
        ] != 0);
    }

    /**
     * setZonehash sets the hash for the zone.
     * May only be called by the owner of that node in the ENS registry.
     * @param node The node to update.
     * @param hash The zonehash to set
     */
    function setZonehash(bytes32 node, bytes calldata hash)
        external
        virtual
        authorised(node)
    {
        uint64 currentRecordVersion = recordVersions[node];
        bytes memory oldhash = versionable_zonehashes[currentRecordVersion][
            node
        ];
        versionable_zonehashes[currentRecordVersion][node] = hash;
        emit DNSZonehashChanged(node, oldhash, hash);
    }

    /**
     * zonehash obtains the hash for the zone.
     * @param node The ENS node to query.
     * @return The associated contenthash.
     */
    function zonehash(bytes32 node)
        external
        view
        virtual
        override
        returns (bytes memory)
    {
        return versionable_zonehashes[recordVersions[node]][node];
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            interfaceID == type(IDNSRecordResolver).interfaceId ||
            interfaceID == type(IDNSZoneResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }

    function setDNSRRSet(
        bytes32 node,
        bytes memory name,
        uint16 resource,
        bytes memory data,
        uint256 offset,
        uint256 size,
        bool deleteRecord,
        uint64 version
    ) private {
        bytes32 nameHash = keccak256(name);
        bytes memory rrData = data.substring(offset, size);
        if (deleteRecord) {
            if (
                versionable_records[version][node][nameHash][resource].length !=
                0
            ) {
                versionable_nameEntriesCount[version][node][nameHash]--;
            }
            delete (versionable_records[version][node][nameHash][resource]);
            emit DNSRecordDeleted(node, name, resource);
        } else {
            if (
                versionable_records[version][node][nameHash][resource].length ==
                0
            ) {
                versionable_nameEntriesCount[version][node][nameHash]++;
            }
            versionable_records[version][node][nameHash][resource] = rrData;
            emit DNSRecordChanged(node, name, resource, rrData);
        }
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/ContentHashResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "../ResolverBase.sol";
import "./IContentHashResolver.sol";

abstract contract ContentHashResolver is IContentHashResolver, ResolverBase {
    mapping(uint64 => mapping(bytes32 => bytes)) versionable_hashes;

    /**
     * Sets the contenthash associated with an ENS node.
     * May only be called by the owner of that node in the ENS registry.
     * @param node The node to update.
     * @param hash The contenthash to set
     */
    function setContenthash(bytes32 node, bytes calldata hash)
        external
        virtual
        authorised(node)
    {
        versionable_hashes[recordVersions[node]][node] = hash;
        emit ContenthashChanged(node, hash);
    }

    /**
     * Returns the contenthash associated with an ENS node.
     * @param node The ENS node to query.
     * @return The associated contenthash.
     */
    function contenthash(bytes32 node)
        external
        view
        virtual
        override
        returns (bytes memory)
    {
        return versionable_hashes[recordVersions[node]][node];
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            interfaceID == type(IContentHashResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/AddrResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "../ResolverBase.sol";
import "./IAddrResolver.sol";
import "./IAddressResolver.sol";

abstract contract AddrResolver is
    IAddrResolver,
    IAddressResolver,
    ResolverBase
{
    uint256 private constant COIN_TYPE_ETH = 60;

    mapping(uint64 => mapping(bytes32 => mapping(uint256 => bytes))) versionable_addresses;

    /**
     * Sets the address associated with an ENS node.
     * May only be called by the owner of that node in the ENS registry.
     * @param node The node to update.
     * @param a The address to set.
     */
    function setAddr(bytes32 node, address a)
        external
        virtual
        authorised(node)
    {
        setAddr(node, COIN_TYPE_ETH, addressToBytes(a));
    }

    /**
     * Returns the address associated with an ENS node.
     * @param node The ENS node to query.
     * @return The associated address.
     */
    function addr(bytes32 node)
        public
        view
        virtual
        override
        returns (address payable)
    {
        bytes memory a = addr(node, COIN_TYPE_ETH);
        if (a.length == 0) {
            return payable(0);
        }
        return bytesToAddress(a);
    }

    function setAddr(
        bytes32 node,
        uint256 coinType,
        bytes memory a
    ) public virtual authorised(node) {
        emit AddressChanged(node, coinType, a);
        if (coinType == COIN_TYPE_ETH) {
            emit AddrChanged(node, bytesToAddress(a));
        }
        versionable_addresses[recordVersions[node]][node][coinType] = a;
    }

    function addr(bytes32 node, uint256 coinType)
        public
        view
        virtual
        override
        returns (bytes memory)
    {
        return versionable_addresses[recordVersions[node]][node][coinType];
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            interfaceID == type(IAddrResolver).interfaceId ||
            interfaceID == type(IAddressResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }

    function bytesToAddress(bytes memory b)
        internal
        pure
        returns (address payable a)
    {
        require(b.length == 20);
        assembly {
            a := div(mload(add(b, 32)), exp(256, 12))
        }
    }

    function addressToBytes(address a) internal pure returns (bytes memory b) {
        b = new bytes(20);
        assembly {
            mstore(add(b, 32), mul(a, exp(256, 12)))
        }
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/ABIResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "./IABIResolver.sol";
import "../ResolverBase.sol";

abstract contract ABIResolver is IABIResolver, ResolverBase {
    mapping(uint64 => mapping(bytes32 => mapping(uint256 => bytes))) versionable_abis;

    /**
     * Sets the ABI associated with an ENS node.
     * Nodes may have one ABI of each content type. To remove an ABI, set it to
     * the empty string.
     * @param node The node to update.
     * @param contentType The content type of the ABI
     * @param data The ABI data.
     */
    function setABI(
        bytes32 node,
        uint256 contentType,
        bytes calldata data
    ) external virtual authorised(node) {
        // Content types must be powers of 2
        require(((contentType - 1) & contentType) == 0);

        versionable_abis[recordVersions[node]][node][contentType] = data;
        emit ABIChanged(node, contentType);
    }

    /**
     * Returns the ABI associated with an ENS node.
     * Defined in EIP205.
     * @param node The ENS node to query
     * @param contentTypes A bitwise OR of the ABI formats accepted by the caller.
     * @return contentType The content type of the return value
     * @return data The ABI data
     */
    function ABI(bytes32 node, uint256 contentTypes)
        external
        view
        virtual
        override
        returns (uint256, bytes memory)
    {
        mapping(uint256 => bytes) storage abiset = versionable_abis[
            recordVersions[node]
        ][node];

        for (
            uint256 contentType = 1;
            contentType <= contentTypes;
            contentType <<= 1
        ) {
            if (
                (contentType & contentTypes) != 0 &&
                abiset[contentType].length > 0
            ) {
                return (contentType, abiset[contentType]);
            }
        }

        return (0, bytes(""));
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            interfaceID == type(IABIResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/ResolverBase.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
import "./profiles/IVersionableResolver.sol";

abstract contract ResolverBase is ERC165, IVersionableResolver {
    mapping(bytes32 => uint64) public recordVersions;

    function isAuthorised(bytes32 node) internal view virtual returns (bool);

    modifier authorised(bytes32 node) {
        require(isAuthorised(node));
        _;
    }

    /**
     * Increments the record version associated with an ENS node.
     * May only be called by the owner of that node in the ENS registry.
     * @param node The node to update.
     */
    function clearRecords(bytes32 node) public virtual authorised(node) {
        recordVersions[node]++;
        emit VersionChanged(node, recordVersions[node]);
    }

    function supportsInterface(bytes4 interfaceID)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            interfaceID == type(IVersionableResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }
}

// File: @ensdomains/ens-contracts/contracts/dnssec-oracle/RRUtils.sol



pragma solidity ^0.8.4;

import "./BytesUtils.sol";
import "@ensdomains/buffer/contracts/Buffer.sol";

/**
 * @dev RRUtils is a library that provides utilities for parsing DNS resource records.
 */
library RRUtils {
    using BytesUtils for *;
    using Buffer for *;

    /**
     * @dev Returns the number of bytes in the DNS name at 'offset' in 'self'.
     * @param self The byte array to read a name from.
     * @param offset The offset to start reading at.
     * @return The length of the DNS name at 'offset', in bytes.
     */
    function nameLength(bytes memory self, uint256 offset)
        internal
        pure
        returns (uint256)
    {
        uint256 idx = offset;
        while (true) {
            assert(idx < self.length);
            uint256 labelLen = self.readUint8(idx);
            idx += labelLen + 1;
            if (labelLen == 0) {
                break;
            }
        }
        return idx - offset;
    }

    /**
     * @dev Returns a DNS format name at the specified offset of self.
     * @param self The byte array to read a name from.
     * @param offset The offset to start reading at.
     * @return ret The name.
     */
    function readName(bytes memory self, uint256 offset)
        internal
        pure
        returns (bytes memory ret)
    {
        uint256 len = nameLength(self, offset);
        return self.substring(offset, len);
    }

    /**
     * @dev Returns the number of labels in the DNS name at 'offset' in 'self'.
     * @param self The byte array to read a name from.
     * @param offset The offset to start reading at.
     * @return The number of labels in the DNS name at 'offset', in bytes.
     */
    function labelCount(bytes memory self, uint256 offset)
        internal
        pure
        returns (uint256)
    {
        uint256 count = 0;
        while (true) {
            assert(offset < self.length);
            uint256 labelLen = self.readUint8(offset);
            offset += labelLen + 1;
            if (labelLen == 0) {
                break;
            }
            count += 1;
        }
        return count;
    }

    uint256 constant RRSIG_TYPE = 0;
    uint256 constant RRSIG_ALGORITHM = 2;
    uint256 constant RRSIG_LABELS = 3;
    uint256 constant RRSIG_TTL = 4;
    uint256 constant RRSIG_EXPIRATION = 8;
    uint256 constant RRSIG_INCEPTION = 12;
    uint256 constant RRSIG_KEY_TAG = 16;
    uint256 constant RRSIG_SIGNER_NAME = 18;

    struct SignedSet {
        uint16 typeCovered;
        uint8 algorithm;
        uint8 labels;
        uint32 ttl;
        uint32 expiration;
        uint32 inception;
        uint16 keytag;
        bytes signerName;
        bytes data;
        bytes name;
    }

    function readSignedSet(bytes memory data)
        internal
        pure
        returns (SignedSet memory self)
    {
        self.typeCovered = data.readUint16(RRSIG_TYPE);
        self.algorithm = data.readUint8(RRSIG_ALGORITHM);
        self.labels = data.readUint8(RRSIG_LABELS);
        self.ttl = data.readUint32(RRSIG_TTL);
        self.expiration = data.readUint32(RRSIG_EXPIRATION);
        self.inception = data.readUint32(RRSIG_INCEPTION);
        self.keytag = data.readUint16(RRSIG_KEY_TAG);
        self.signerName = readName(data, RRSIG_SIGNER_NAME);
        self.data = data.substring(
            RRSIG_SIGNER_NAME + self.signerName.length,
            data.length - RRSIG_SIGNER_NAME - self.signerName.length
        );
    }

    function rrs(SignedSet memory rrset)
        internal
        pure
        returns (RRIterator memory)
    {
        return iterateRRs(rrset.data, 0);
    }

    /**
     * @dev An iterator over resource records.
     */
    struct RRIterator {
        bytes data;
        uint256 offset;
        uint16 dnstype;
        uint16 class;
        uint32 ttl;
        uint256 rdataOffset;
        uint256 nextOffset;
    }

    /**
     * @dev Begins iterating over resource records.
     * @param self The byte string to read from.
     * @param offset The offset to start reading at.
     * @return ret An iterator object.
     */
    function iterateRRs(bytes memory self, uint256 offset)
        internal
        pure
        returns (RRIterator memory ret)
    {
        ret.data = self;
        ret.nextOffset = offset;
        next(ret);
    }

    /**
     * @dev Returns true iff there are more RRs to iterate.
     * @param iter The iterator to check.
     * @return True iff the iterator has finished.
     */
    function done(RRIterator memory iter) internal pure returns (bool) {
        return iter.offset >= iter.data.length;
    }

    /**
     * @dev Moves the iterator to the next resource record.
     * @param iter The iterator to advance.
     */
    function next(RRIterator memory iter) internal pure {
        iter.offset = iter.nextOffset;
        if (iter.offset >= iter.data.length) {
            return;
        }

        // Skip the name
        uint256 off = iter.offset + nameLength(iter.data, iter.offset);

        // Read type, class, and ttl
        iter.dnstype = iter.data.readUint16(off);
        off += 2;
        iter.class = iter.data.readUint16(off);
        off += 2;
        iter.ttl = iter.data.readUint32(off);
        off += 4;

        // Read the rdata
        uint256 rdataLength = iter.data.readUint16(off);
        off += 2;
        iter.rdataOffset = off;
        iter.nextOffset = off + rdataLength;
    }

    /**
     * @dev Returns the name of the current record.
     * @param iter The iterator.
     * @return A new bytes object containing the owner name from the RR.
     */
    function name(RRIterator memory iter) internal pure returns (bytes memory) {
        return
            iter.data.substring(
                iter.offset,
                nameLength(iter.data, iter.offset)
            );
    }

    /**
     * @dev Returns the rdata portion of the current record.
     * @param iter The iterator.
     * @return A new bytes object containing the RR's RDATA.
     */
    function rdata(RRIterator memory iter)
        internal
        pure
        returns (bytes memory)
    {
        return
            iter.data.substring(
                iter.rdataOffset,
                iter.nextOffset - iter.rdataOffset
            );
    }

    uint256 constant DNSKEY_FLAGS = 0;
    uint256 constant DNSKEY_PROTOCOL = 2;
    uint256 constant DNSKEY_ALGORITHM = 3;
    uint256 constant DNSKEY_PUBKEY = 4;

    struct DNSKEY {
        uint16 flags;
        uint8 protocol;
        uint8 algorithm;
        bytes publicKey;
    }

    function readDNSKEY(
        bytes memory data,
        uint256 offset,
        uint256 length
    ) internal pure returns (DNSKEY memory self) {
        self.flags = data.readUint16(offset + DNSKEY_FLAGS);
        self.protocol = data.readUint8(offset + DNSKEY_PROTOCOL);
        self.algorithm = data.readUint8(offset + DNSKEY_ALGORITHM);
        self.publicKey = data.substring(
            offset + DNSKEY_PUBKEY,
            length - DNSKEY_PUBKEY
        );
    }

    uint256 constant DS_KEY_TAG = 0;
    uint256 constant DS_ALGORITHM = 2;
    uint256 constant DS_DIGEST_TYPE = 3;
    uint256 constant DS_DIGEST = 4;

    struct DS {
        uint16 keytag;
        uint8 algorithm;
        uint8 digestType;
        bytes digest;
    }

    function readDS(
        bytes memory data,
        uint256 offset,
        uint256 length
    ) internal pure returns (DS memory self) {
        self.keytag = data.readUint16(offset + DS_KEY_TAG);
        self.algorithm = data.readUint8(offset + DS_ALGORITHM);
        self.digestType = data.readUint8(offset + DS_DIGEST_TYPE);
        self.digest = data.substring(offset + DS_DIGEST, length - DS_DIGEST);
    }

    function compareNames(bytes memory self, bytes memory other)
        internal
        pure
        returns (int256)
    {
        if (self.equals(other)) {
            return 0;
        }

        uint256 off;
        uint256 otheroff;
        uint256 prevoff;
        uint256 otherprevoff;
        uint256 counts = labelCount(self, 0);
        uint256 othercounts = labelCount(other, 0);

        // Keep removing labels from the front of the name until both names are equal length
        while (counts > othercounts) {
            prevoff = off;
            off = progress(self, off);
            counts--;
        }

        while (othercounts > counts) {
            otherprevoff = otheroff;
            otheroff = progress(other, otheroff);
            othercounts--;
        }

        // Compare the last nonequal labels to each other
        while (counts > 0 && !self.equals(off, other, otheroff)) {
            prevoff = off;
            off = progress(self, off);
            otherprevoff = otheroff;
            otheroff = progress(other, otheroff);
            counts -= 1;
        }

        if (off == 0) {
            return -1;
        }
        if (otheroff == 0) {
            return 1;
        }

        return
            self.compare(
                prevoff + 1,
                self.readUint8(prevoff),
                other,
                otherprevoff + 1,
                other.readUint8(otherprevoff)
            );
    }

    /**
     * @dev Compares two serial numbers using RFC1982 serial number math.
     */
    function serialNumberGte(uint32 i1, uint32 i2)
        internal
        pure
        returns (bool)
    {
        return int32(i1) - int32(i2) >= 0;
    }

    function progress(bytes memory body, uint256 off)
        internal
        pure
        returns (uint256)
    {
        return off + 1 + body.readUint8(off);
    }

    /**
     * @dev Computes the keytag for a chunk of data.
     * @param data The data to compute a keytag for.
     * @return The computed key tag.
     */
    function computeKeytag(bytes memory data) internal pure returns (uint16) {
        /* This function probably deserves some explanation.
         * The DNSSEC keytag function is a checksum that relies on summing up individual bytes
         * from the input string, with some mild bitshifting. Here's a Naive solidity implementation:
         *
         *     function computeKeytag(bytes memory data) internal pure returns (uint16) {
         *         uint ac;
         *         for (uint i = 0; i < data.length; i++) {
         *             ac += i & 1 == 0 ? uint16(data.readUint8(i)) << 8 : data.readUint8(i);
         *         }
         *         return uint16(ac + (ac >> 16));
         *     }
         *
         * The EVM, with its 256 bit words, is exceedingly inefficient at doing byte-by-byte operations;
         * the code above, on reasonable length inputs, consumes over 100k gas. But we can make the EVM's
         * large words work in our favour.
         *
         * The code below works by treating the input as a series of 256 bit words. It first masks out
         * even and odd bytes from each input word, adding them to two separate accumulators `ac1` and `ac2`.
         * The bytes are separated by empty bytes, so as long as no individual sum exceeds 2^16-1, we're
         * effectively summing 16 different numbers with each EVM ADD opcode.
         *
         * Once it's added up all the inputs, it has to add all the 16 bit values in `ac1` and `ac2` together.
         * It does this using the same trick - mask out every other value, shift to align them, add them together.
         * After the first addition on both accumulators, there's enough room to add the two accumulators together,
         * and the remaining sums can be done just on ac1.
         */
        unchecked {
            require(data.length <= 8192, "Long keys not permitted");
            uint256 ac1;
            uint256 ac2;
            for (uint256 i = 0; i < data.length + 31; i += 32) {
                uint256 word;
                assembly {
                    word := mload(add(add(data, 32), i))
                }
                if (i + 32 > data.length) {
                    uint256 unused = 256 - (data.length - i) * 8;
                    word = (word >> unused) << unused;
                }
                ac1 +=
                    (word &
                        0xFF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00) >>
                    8;
                ac2 += (word &
                    0x00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF);
            }
            ac1 =
                (ac1 &
                    0x0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF) +
                ((ac1 &
                    0xFFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000) >>
                    16);
            ac2 =
                (ac2 &
                    0x0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF) +
                ((ac2 &
                    0xFFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000) >>
                    16);
            ac1 = (ac1 << 8) + ac2;
            ac1 =
                (ac1 &
                    0x00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF) +
                ((ac1 &
                    0xFFFFFFFF00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF00000000) >>
                    32);
            ac1 =
                (ac1 &
                    0x0000000000000000FFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF) +
                ((ac1 &
                    0xFFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF0000000000000000) >>
                    64);
            ac1 =
                (ac1 &
                    0x00000000000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF) +
                (ac1 >> 128);
            ac1 += (ac1 >> 16) & 0xFFFF;
            return uint16(ac1);
        }
    }
}

// File: @ensdomains/ens-contracts/contracts/resolvers/IMulticallable.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

interface IMulticallable {
    function multicall(bytes[] calldata data)
        external
        returns (bytes[] memory results);

    function multicallWithNodeCheck(bytes32, bytes[] calldata data)
        external
        returns (bytes[] memory results);
}

// File: @ensdomains/ens-contracts/contracts/resolvers/profiles/IVersionableResolver.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

interface IVersionableResolver {
    event VersionChanged(bytes32 indexed node, uint64 newVersion);

    function recordVersions(bytes32 node) external view returns (uint64);
}

// File: @ensdomains/buffer/contracts/Buffer.sol



// SPDX-License-Identifier: BSD-2-Clause
pragma solidity ^0.8.4;

/**
* @dev A library for working with mutable byte buffers in Solidity.
*
* Byte buffers are mutable and expandable, and provide a variety of primitives
* for appending to them. At any time you can fetch a bytes object containing the
* current contents of the buffer. The bytes object should not be stored between
* operations, as it may change due to resizing of the buffer.
*/
library Buffer {
    /**
    * @dev Represents a mutable buffer. Buffers have a current value (buf) and
    *      a capacity. The capacity may be longer than the current value, in
    *      which case it can be extended without the need to allocate more memory.
    */
    struct buffer {
        bytes buf;
        uint capacity;
    }

    /**
    * @dev Initializes a buffer with an initial capacity.
    * @param buf The buffer to initialize.
    * @param capacity The number of bytes of space to allocate the buffer.
    * @return The buffer, for chaining.
    */
    function init(buffer memory buf, uint capacity) internal pure returns(buffer memory) {
        if (capacity % 32 != 0) {
            capacity += 32 - (capacity % 32);
        }
        // Allocate space for the buffer data
        buf.capacity = capacity;
        assembly {
            let ptr := mload(0x40)
            mstore(buf, ptr)
            mstore(ptr, 0)
            let fpm := add(32, add(ptr, capacity))
            if lt(fpm, ptr) {
                revert(0, 0)
            }
            mstore(0x40, fpm)
        }
        return buf;
    }

    /**
    * @dev Initializes a new buffer from an existing bytes object.
    *      Changes to the buffer may mutate the original value.
    * @param b The bytes object to initialize the buffer with.
    * @return A new buffer.
    */
    function fromBytes(bytes memory b) internal pure returns(buffer memory) {
        buffer memory buf;
        buf.buf = b;
        buf.capacity = b.length;
        return buf;
    }

    function resize(buffer memory buf, uint capacity) private pure {
        bytes memory oldbuf = buf.buf;
        init(buf, capacity);
        append(buf, oldbuf);
    }

    /**
    * @dev Sets buffer length to 0.
    * @param buf The buffer to truncate.
    * @return The original buffer, for chaining..
    */
    function truncate(buffer memory buf) internal pure returns (buffer memory) {
        assembly {
            let bufptr := mload(buf)
            mstore(bufptr, 0)
        }
        return buf;
    }

    /**
    * @dev Appends len bytes of a byte string to a buffer. Resizes if doing so would exceed
    *      the capacity of the buffer.
    * @param buf The buffer to append to.
    * @param data The data to append.
    * @param len The number of bytes to copy.
    * @return The original buffer, for chaining.
    */
    function append(buffer memory buf, bytes memory data, uint len) internal pure returns(buffer memory) {
        require(len <= data.length);

        uint off = buf.buf.length;
        uint newCapacity = off + len;
        if (newCapacity > buf.capacity) {
            resize(buf, newCapacity * 2);
        }

        uint dest;
        uint src;
        assembly {
            // Memory address of the buffer data
            let bufptr := mload(buf)
            // Length of existing buffer data
            let buflen := mload(bufptr)
            // Start address = buffer address + offset + sizeof(buffer length)
            dest := add(add(bufptr, 32), off)
            // Update buffer length if we're extending it
            if gt(newCapacity, buflen) {
                mstore(bufptr, newCapacity)
            }
            src := add(data, 32)
        }

        // Copy word-length chunks while possible
        for (; len >= 32; len -= 32) {
            assembly {
                mstore(dest, mload(src))
            }
            dest += 32;
            src += 32;
        }

        // Copy remaining bytes
        unchecked {
            uint mask = (256 ** (32 - len)) - 1;
            assembly {
                let srcpart := and(mload(src), not(mask))
                let destpart := and(mload(dest), mask)
                mstore(dest, or(destpart, srcpart))
            }
        }

        return buf;
    }

    /**
    * @dev Appends a byte string to a buffer. Resizes if doing so would exceed
    *      the capacity of the buffer.
    * @param buf The buffer to append to.
    * @param data The data to append.
    * @return The original buffer, for chaining.
    */
    function append(buffer memory buf, bytes memory data) internal pure returns (buffer memory) {
        return append(buf, data, data.length);
    }

    /**
    * @dev Appends a byte to the buffer. Resizes if doing so would exceed the
    *      capacity of the buffer.
    * @param buf The buffer to append to.
    * @param data The data to append.
    * @return The original buffer, for chaining.
    */
    function appendUint8(buffer memory buf, uint8 data) internal pure returns(buffer memory) {
        uint off = buf.buf.length;
        uint offPlusOne = off + 1;
        if (off >= buf.capacity) {
            resize(buf, offPlusOne * 2);
        }

        assembly {
            // Memory address of the buffer data
            let bufptr := mload(buf)
            // Address = buffer address + sizeof(buffer length) + off
            let dest := add(add(bufptr, off), 32)
            mstore8(dest, data)
            // Update buffer length if we extended it
            if gt(offPlusOne, mload(bufptr)) {
                mstore(bufptr, offPlusOne)
            }
        }

        return buf;
    }

    /**
    * @dev Appends len bytes of bytes32 to a buffer. Resizes if doing so would
    *      exceed the capacity of the buffer.
    * @param buf The buffer to append to.
    * @param data The data to append.
    * @param len The number of bytes to write (left-aligned).
    * @return The original buffer, for chaining.
    */
    function append(buffer memory buf, bytes32 data, uint len) private pure returns(buffer memory) {
        uint off = buf.buf.length;
        uint newCapacity = len + off;
        if (newCapacity > buf.capacity) {
            resize(buf, newCapacity * 2);
        }

        unchecked {
            uint mask = (256 ** len) - 1;
            // Right-align data
            data = data >> (8 * (32 - len));
            assembly {
                // Memory address of the buffer data
                let bufptr := mload(buf)
                // Address = buffer address + sizeof(buffer length) + newCapacity
                let dest := add(bufptr, newCapacity)
                mstore(dest, or(and(mload(dest), not(mask)), data))
                // Update buffer length if we extended it
                if gt(newCapacity, mload(bufptr)) {
                    mstore(bufptr, newCapacity)
                }
            }
        }
        return buf;
    }

    /**
    * @dev Appends a bytes20 to the buffer. Resizes if doing so would exceed
    *      the capacity of the buffer.
    * @param buf The buffer to append to.
    * @param data The data to append.
    * @return The original buffer, for chhaining.
    */
    function appendBytes20(buffer memory buf, bytes20 data) internal pure returns (buffer memory) {
        return append(buf, bytes32(data), 20);
    }

    /**
    * @dev Appends a bytes32 to the buffer. Resizes if doing so would exceed
    *      the capacity of the buffer.
    * @param buf The buffer to append to.
    * @param data The data to append.
    * @return The original buffer, for chaining.
    */
    function appendBytes32(buffer memory buf, bytes32 data) internal pure returns (buffer memory) {
        return append(buf, data, 32);
    }

    /**
     * @dev Appends a byte to the end of the buffer. Resizes if doing so would
     *      exceed the capacity of the buffer.
     * @param buf The buffer to append to.
     * @param data The data to append.
     * @param len The number of bytes to write (right-aligned).
     * @return The original buffer.
     */
    function appendInt(buffer memory buf, uint data, uint len) internal pure returns(buffer memory) {
        uint off = buf.buf.length;
        uint newCapacity = len + off;
        if (newCapacity > buf.capacity) {
            resize(buf, newCapacity * 2);
        }

        uint mask = (256 ** len) - 1;
        assembly {
            // Memory address of the buffer data
            let bufptr := mload(buf)
            // Address = buffer address + sizeof(buffer length) + newCapacity
            let dest := add(bufptr, newCapacity)
            mstore(dest, or(and(mload(dest), not(mask)), data))
            // Update buffer length if we extended it
            if gt(newCapacity, mload(bufptr)) {
                mstore(bufptr, newCapacity)
            }
        }
        return buf;
    }
}

// File: @ensdomains/ens-contracts/contracts/dnssec-oracle/BytesUtils.sol



pragma solidity ^0.8.4;

library BytesUtils {
    /*
     * @dev Returns the keccak-256 hash of a byte range.
     * @param self The byte string to hash.
     * @param offset The position to start hashing at.
     * @param len The number of bytes to hash.
     * @return The hash of the byte range.
     */
    function keccak(
        bytes memory self,
        uint256 offset,
        uint256 len
    ) internal pure returns (bytes32 ret) {
        require(offset + len <= self.length);
        assembly {
            ret := keccak256(add(add(self, 32), offset), len)
        }
    }

    /*
     * @dev Returns a positive number if `other` comes lexicographically after
     *      `self`, a negative number if it comes before, or zero if the
     *      contents of the two bytes are equal.
     * @param self The first bytes to compare.
     * @param other The second bytes to compare.
     * @return The result of the comparison.
     */
    function compare(bytes memory self, bytes memory other)
        internal
        pure
        returns (int256)
    {
        return compare(self, 0, self.length, other, 0, other.length);
    }

    /*
     * @dev Returns a positive number if `other` comes lexicographically after
     *      `self`, a negative number if it comes before, or zero if the
     *      contents of the two bytes are equal. Comparison is done per-rune,
     *      on unicode codepoints.
     * @param self The first bytes to compare.
     * @param offset The offset of self.
     * @param len    The length of self.
     * @param other The second bytes to compare.
     * @param otheroffset The offset of the other string.
     * @param otherlen    The length of the other string.
     * @return The result of the comparison.
     */
    function compare(
        bytes memory self,
        uint256 offset,
        uint256 len,
        bytes memory other,
        uint256 otheroffset,
        uint256 otherlen
    ) internal pure returns (int256) {
        uint256 shortest = len;
        if (otherlen < len) shortest = otherlen;

        uint256 selfptr;
        uint256 otherptr;

        assembly {
            selfptr := add(self, add(offset, 32))
            otherptr := add(other, add(otheroffset, 32))
        }
        for (uint256 idx = 0; idx < shortest; idx += 32) {
            uint256 a;
            uint256 b;
            assembly {
                a := mload(selfptr)
                b := mload(otherptr)
            }
            if (a != b) {
                // Mask out irrelevant bytes and check again
                uint256 mask;
                if (shortest > 32) {
                    mask = type(uint256).max;
                } else {
                    mask = ~(2**(8 * (32 - shortest + idx)) - 1);
                }
                int256 diff = int256(a & mask) - int256(b & mask);
                if (diff != 0) return diff;
            }
            selfptr += 32;
            otherptr += 32;
        }

        return int256(len) - int256(otherlen);
    }

    /*
     * @dev Returns true if the two byte ranges are equal.
     * @param self The first byte range to compare.
     * @param offset The offset into the first byte range.
     * @param other The second byte range to compare.
     * @param otherOffset The offset into the second byte range.
     * @param len The number of bytes to compare
     * @return True if the byte ranges are equal, false otherwise.
     */
    function equals(
        bytes memory self,
        uint256 offset,
        bytes memory other,
        uint256 otherOffset,
        uint256 len
    ) internal pure returns (bool) {
        return keccak(self, offset, len) == keccak(other, otherOffset, len);
    }

    /*
     * @dev Returns true if the two byte ranges are equal with offsets.
     * @param self The first byte range to compare.
     * @param offset The offset into the first byte range.
     * @param other The second byte range to compare.
     * @param otherOffset The offset into the second byte range.
     * @return True if the byte ranges are equal, false otherwise.
     */
    function equals(
        bytes memory self,
        uint256 offset,
        bytes memory other,
        uint256 otherOffset
    ) internal pure returns (bool) {
        return
            keccak(self, offset, self.length - offset) ==
            keccak(other, otherOffset, other.length - otherOffset);
    }

    /*
     * @dev Compares a range of 'self' to all of 'other' and returns True iff
     *      they are equal.
     * @param self The first byte range to compare.
     * @param offset The offset into the first byte range.
     * @param other The second byte range to compare.
     * @return True if the byte ranges are equal, false otherwise.
     */
    function equals(
        bytes memory self,
        uint256 offset,
        bytes memory other
    ) internal pure returns (bool) {
        return
            self.length >= offset + other.length &&
            equals(self, offset, other, 0, other.length);
    }

    /*
     * @dev Returns true if the two byte ranges are equal.
     * @param self The first byte range to compare.
     * @param other The second byte range to compare.
     * @return True if the byte ranges are equal, false otherwise.
     */
    function equals(bytes memory self, bytes memory other)
        internal
        pure
        returns (bool)
    {
        return
            self.length == other.length &&
            equals(self, 0, other, 0, self.length);
    }

    /*
     * @dev Returns the 8-bit number at the specified index of self.
     * @param self The byte string.
     * @param idx The index into the bytes
     * @return The specified 8 bits of the string, interpreted as an integer.
     */
    function readUint8(bytes memory self, uint256 idx)
        internal
        pure
        returns (uint8 ret)
    {
        return uint8(self[idx]);
    }

    /*
     * @dev Returns the 16-bit number at the specified index of self.
     * @param self The byte string.
     * @param idx The index into the bytes
     * @return The specified 16 bits of the string, interpreted as an integer.
     */
    function readUint16(bytes memory self, uint256 idx)
        internal
        pure
        returns (uint16 ret)
    {
        require(idx + 2 <= self.length);
        assembly {
            ret := and(mload(add(add(self, 2), idx)), 0xFFFF)
        }
    }

    /*
     * @dev Returns the 32-bit number at the specified index of self.
     * @param self The byte string.
     * @param idx The index into the bytes
     * @return The specified 32 bits of the string, interpreted as an integer.
     */
    function readUint32(bytes memory self, uint256 idx)
        internal
        pure
        returns (uint32 ret)
    {
        require(idx + 4 <= self.length);
        assembly {
            ret := and(mload(add(add(self, 4), idx)), 0xFFFFFFFF)
        }
    }

    /*
     * @dev Returns the 32 byte value at the specified index of self.
     * @param self The byte string.
     * @param idx The index into the bytes
     * @return The specified 32 bytes of the string.
     */
    function readBytes32(bytes memory self, uint256 idx)
        internal
        pure
        returns (bytes32 ret)
    {
        require(idx + 32 <= self.length);
        assembly {
            ret := mload(add(add(self, 32), idx))
        }
    }

    /*
     * @dev Returns the 32 byte value at the specified index of self.
     * @param self The byte string.
     * @param idx The index into the bytes
     * @return The specified 32 bytes of the string.
     */
    function readBytes20(bytes memory self, uint256 idx)
        internal
        pure
        returns (bytes20 ret)
    {
        require(idx + 20 <= self.length);
        assembly {
            ret := and(
                mload(add(add(self, 32), idx)),
                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF000000000000000000000000
            )
        }
    }

    /*
     * @dev Returns the n byte value at the specified index of self.
     * @param self The byte string.
     * @param idx The index into the bytes.
     * @param len The number of bytes.
     * @return The specified 32 bytes of the string.
     */
    function readBytesN(
        bytes memory self,
        uint256 idx,
        uint256 len
    ) internal pure returns (bytes32 ret) {
        require(len <= 32);
        require(idx + len <= self.length);
        assembly {
            let mask := not(sub(exp(256, sub(32, len)), 1))
            ret := and(mload(add(add(self, 32), idx)), mask)
        }
    }

    function memcpy(
        uint256 dest,
        uint256 src,
        uint256 len
    ) private pure {
        // Copy word-length chunks while possible
        for (; len >= 32; len -= 32) {
            assembly {
                mstore(dest, mload(src))
            }
            dest += 32;
            src += 32;
        }

        // Copy remaining bytes
        unchecked {
            uint256 mask = (256**(32 - len)) - 1;
            assembly {
                let srcpart := and(mload(src), not(mask))
                let destpart := and(mload(dest), mask)
                mstore(dest, or(destpart, srcpart))
            }
        }
    }

    /*
     * @dev Copies a substring into a new byte string.
     * @param self The byte string to copy from.
     * @param offset The offset to start copying at.
     * @param len The number of bytes to copy.
     */
    function substring(
        bytes memory self,
        uint256 offset,
        uint256 len
    ) internal pure returns (bytes memory) {
        require(offset + len <= self.length);

        bytes memory ret = new bytes(len);
        uint256 dest;
        uint256 src;

        assembly {
            dest := add(ret, 32)
            src := add(add(self, 32), offset)
        }
        memcpy(dest, src, len);

        return ret;
    }

    // Maps characters from 0x30 to 0x7A to their base32 values.
    // 0xFF represents invalid characters in that range.
    bytes constant base32HexTable =
        hex"00010203040506070809FFFFFFFFFFFFFF0A0B0C0D0E0F101112131415161718191A1B1C1D1E1FFFFFFFFFFFFFFFFFFFFF0A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";

    /**
     * @dev Decodes unpadded base32 data of up to one word in length.
     * @param self The data to decode.
     * @param off Offset into the string to start at.
     * @param len Number of characters to decode.
     * @return The decoded data, left aligned.
     */
    function base32HexDecodeWord(
        bytes memory self,
        uint256 off,
        uint256 len
    ) internal pure returns (bytes32) {
        require(len <= 52);

        uint256 ret = 0;
        uint8 decoded;
        for (uint256 i = 0; i < len; i++) {
            bytes1 char = self[off + i];
            require(char >= 0x30 && char <= 0x7A);
            decoded = uint8(base32HexTable[uint256(uint8(char)) - 0x30]);
            require(decoded <= 0x20);
            if (i == len - 1) {
                break;
            }
            ret = (ret << 5) | decoded;
        }

        uint256 bitlen = len * 5;
        if (len % 8 == 0) {
            // Multiple of 8 characters, no padding
            ret = (ret << 5) | decoded;
        } else if (len % 8 == 2) {
            // Two extra characters - 1 byte
            ret = (ret << 3) | (decoded >> 2);
            bitlen -= 2;
        } else if (len % 8 == 4) {
            // Four extra characters - 2 bytes
            ret = (ret << 1) | (decoded >> 4);
            bitlen -= 4;
        } else if (len % 8 == 5) {
            // Five extra characters - 3 bytes
            ret = (ret << 4) | (decoded >> 1);
            bitlen -= 1;
        } else if (len % 8 == 7) {
            // Seven extra characters - 4 bytes
            ret = (ret << 2) | (decoded >> 3);
            bitlen -= 3;
        } else {
            revert();
        }

        return bytes32(ret << (256 - bitlen));
    }

    /**
     * @dev Finds the first occurrence of the byte `needle` in `self`.
     * @param self The string to search
     * @param off The offset to start searching at
     * @param len The number of bytes to search
     * @param needle The byte to search for
     * @return The offset of `needle` in `self`, or 2**256-1 if it was not found.
     */
    function find(
        bytes memory self,
        uint256 off,
        uint256 len,
        bytes1 needle
    ) internal pure returns (uint256) {
        for (uint256 idx = off; idx < off + len; idx++) {
            if (self[idx] == needle) {
                return idx;
            }
        }
        return type(uint256).max;
    }
}