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 isSubdomainOf(
        bytes memory self,
        bytes memory other
    ) internal pure returns (bool) {
        uint256 off = 0;
        uint256 counts = labelCount(self, 0);
        uint256 othercounts = labelCount(other, 0);

        while (counts > othercounts) {
            off = progress(self, off);
            counts--;
        }

        return self.equals(off, other, 0);
    }

    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) {
        unchecked {
            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);
        }
    }
}

// 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 RNS node.
     * May only be called by the owner of that node in the RNS 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);
    }
}

pragma solidity >=0.8.4;
import "@openzeppelin/contracts/access/Ownable.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 "./profiles/ExtendedResolver.sol";

/**
 * A simple resolver anyone can use; only allows the owner of a node to set its
 * address.
 */
contract OwnedResolver is
    Ownable,
    ABIResolver,
    AddrResolver,
    ContentHashResolver,
    DNSResolver,
    InterfaceResolver,
    NameResolver,
    PubkeyResolver,
    TextResolver,
    ExtendedResolver
{
    function isAuthorised(bytes32) internal view override returns (bool) {
        return msg.sender == owner();
    }

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

pragma solidity ^0.8.4;

library BytesUtils {
    error OffsetOutOfBoundsError(uint256 offset, uint256 length);

    /*
     * @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) {
        if (offset + len > self.length) {
            revert OffsetOutOfBoundsError(offset + len, self.length);
        }
        if (otheroffset + otherlen > other.length) {
            revert OffsetOutOfBoundsError(otheroffset + otherlen, other.length);
        }

        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 - idx >= 32) {
                    mask = type(uint256).max;
                } else {
                    mask = ~(2 ** (8 * (idx + 32 - shortest)) - 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;
    }
}

// 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;
    }
}

// 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;
    }
}

// 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);
    }
}

// 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 RNS 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 RNS node.
     * Defined in EIP205.
     * @param node The RNS 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);
    }
}

// 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 RNS 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 RNS 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);
        }
    }
}

// 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 RNS node.
     * May only be called by the owner of that node in the RNS 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 RNS node.
     * @param node The RNS 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)))
        }
    }
}

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

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

    /**
     * Returns the ABI associated with an RNS node.
     * Defined in EIP205.
     * @param node The RNS 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);
}

// 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 RNS node, for reverse records.
     * May only be called by the owner of that node in the RNS 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 RNS node, for reverse records.
     * Defined in EIP181.
     * @param node The RNS 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);
    }
}

// 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 RNS node and key.
     * May only be called by the owner of that node in the RNS 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 RNS node and key.
     * @param node The RNS 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);
    }
}

// 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 RNS node.
     * @param node The RNS node to query.
     * @return The associated address.
     */
    function addr(bytes32 node) external view returns (address payable);
}

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

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

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

// 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 RNS node and key.
     * @param node The RNS 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);
}

// 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 RNS node.
     * @param node The RNS 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 RNS node.
     * Defined in EIP 619.
     * @param node The RNS 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);
    }
}

// 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 RNS node.
     * Defined in EIP 619.
     * @param node The RNS 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);
}

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

contract ExtendedResolver {
    function resolve(
        bytes memory /* name */,
        bytes memory data
    ) external view returns (bytes memory) {
        (bool success, bytes memory result) = address(this).staticcall(data);
        if (success) {
            return result;
        } else {
            // Revert with the reason provided by the call
            assembly {
                revert(add(result, 0x20), mload(result))
            }
        }
    }
}

// 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);
}

// 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 RNS node to query.
     * @return The associated contenthash.
     */
    function zonehash(bytes32 node) external view returns (bytes memory);
}

// 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 RNS 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);
    }
}