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pragma solidity ^0.7.0;
import "./ENS.sol";
* A registrar that allocates subdomains to the first person to claim them.
contract FIFSRegistrar {
ENS ens;
bytes32 rootNode;
modifier only_owner(bytes32 label) {
address currentOwner = ens.owner(keccak256(abi.encodePacked(rootNode, label)));
require(currentOwner == address(0x0) || currentOwner == msg.sender);
* Constructor.
* @param ensAddr The address of the ENS registry.
* @param node The node that this registrar administers.
constructor(ENS ensAddr, bytes32 node) public {
ens = ensAddr;
rootNode = node;
* Register a name, or change the owner of an existing registration.
* @param label The hash of the label to register.
* @param owner The address of the new owner.
function register(bytes32 label, address owner) public only_owner(label) {
ens.setSubnodeOwner(rootNode, label, owner);