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

    mapping(bytes32=>PublicKey) 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) virtual external authorised(node) {
        pubkeys[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) virtual override external view returns (bytes32 x, bytes32 y) {
        return (pubkeys[node].x, pubkeys[node].y);
    }

    function supportsInterface(bytes4 interfaceID) virtual override public pure returns(bool) {
        return interfaceID == type(IPubkeyResolver).interfaceId || super.supportsInterface(interfaceID);
    }
}
function pubkey(bytes32 node) virtual override external view returns (bytes32 x, bytes32 y) {
    return (pubkeys[node].x, pubkeys[node].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.
 */