Contract

/**
 *Submitted for verification at Etherscan.io on 2020-01-30
*/

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

pragma solidity >=0.4.24;

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/Deed.sol

pragma solidity >=0.4.24;

interface Deed {

    function setOwner(address payable newOwner) external;
    function setRegistrar(address newRegistrar) external;
    function setBalance(uint newValue, bool throwOnFailure) external;
    function closeDeed(uint refundRatio) external;
    function destroyDeed() external;

    function owner() external view returns (address);
    function previousOwner() external view returns (address);
    function value() external view returns (uint);
    function creationDate() external view returns (uint);

}

// File: @ensdomains/ens/contracts/Registrar.sol

pragma solidity >=0.4.24;


interface Registrar {

    enum Mode { Open, Auction, Owned, Forbidden, Reveal, NotYetAvailable }

    event AuctionStarted(bytes32 indexed hash, uint registrationDate);
    event NewBid(bytes32 indexed hash, address indexed bidder, uint deposit);
    event BidRevealed(bytes32 indexed hash, address indexed owner, uint value, uint8 status);
    event HashRegistered(bytes32 indexed hash, address indexed owner, uint value, uint registrationDate);
    event HashReleased(bytes32 indexed hash, uint value);
    event HashInvalidated(bytes32 indexed hash, string indexed name, uint value, uint registrationDate);

    function state(bytes32 _hash) external view returns (Mode);
    function startAuction(bytes32 _hash) external;
    function startAuctions(bytes32[] calldata _hashes) external;
    function newBid(bytes32 sealedBid) external payable;
    function startAuctionsAndBid(bytes32[] calldata hashes, bytes32 sealedBid) external payable;
    function unsealBid(bytes32 _hash, uint _value, bytes32 _salt) external;
    function cancelBid(address bidder, bytes32 seal) external;
    function finalizeAuction(bytes32 _hash) external;
    function transfer(bytes32 _hash, address payable newOwner) external;
    function releaseDeed(bytes32 _hash) external;
    function invalidateName(string calldata unhashedName) external;
    function eraseNode(bytes32[] calldata labels) external;
    function transferRegistrars(bytes32 _hash) external;
    function acceptRegistrarTransfer(bytes32 hash, Deed deed, uint registrationDate) external;
    function entries(bytes32 _hash) external view returns (Mode, address, uint, uint, uint);
}

// File: @ensdomains/subdomain-registrar/contracts/Resolver.sol

pragma solidity ^0.5.0;


/**
 * @dev A basic interface for ENS resolvers.
 */
contract Resolver {
    function supportsInterface(bytes4 interfaceID) public pure returns (bool);
    function addr(bytes32 node) public view returns (address);
    function setAddr(bytes32 node, address addr) public;
}

// File: @ensdomains/subdomain-registrar/contracts/RegistrarInterface.sol

pragma solidity ^0.5.0;

contract RegistrarInterface {
    event OwnerChanged(bytes32 indexed label, address indexed oldOwner, address indexed newOwner);
    event DomainConfigured(bytes32 indexed label);
    event DomainUnlisted(bytes32 indexed label);
    event NewRegistration(bytes32 indexed label, string subdomain, address indexed owner, address indexed referrer, uint price);
    event RentPaid(bytes32 indexed label, string subdomain, uint amount, uint expirationDate);

    // InterfaceID of these four methods is 0xc1b15f5a
    function query(bytes32 label, string calldata subdomain) external view returns (string memory domain, uint signupFee, uint rent, uint referralFeePPM);
    function register(bytes32 label, string calldata subdomain, address owner, address payable referrer, address resolver) external payable;

    function rentDue(bytes32 label, string calldata subdomain) external view returns (uint timestamp);
    function payRent(bytes32 label, string calldata subdomain) external payable;
}

// File: @ensdomains/subdomain-registrar/contracts/AbstractSubdomainRegistrar.sol

pragma solidity ^0.5.0;




contract AbstractSubdomainRegistrar is RegistrarInterface {

    // namehash('eth')
    bytes32 constant public TLD_NODE = 0x93cdeb708b7545dc668eb9280176169d1c33cfd8ed6f04690a0bcc88a93fc4ae;

    bool public stopped = false;
    address public registrarOwner;
    address public migration;

    address public registrar;

    ENS public ens;

    modifier owner_only(bytes32 label) {
        require(owner(label) == msg.sender);
        _;
    }

    modifier not_stopped() {
        require(!stopped);
        _;
    }

    modifier registrar_owner_only() {
        require(msg.sender == registrarOwner);
        _;
    }

    event DomainTransferred(bytes32 indexed label, string name);

    constructor(ENS _ens) public {
        ens = _ens;
        registrar = ens.owner(TLD_NODE);
        registrarOwner = msg.sender;
    }

    function doRegistration(bytes32 node, bytes32 label, address subdomainOwner, Resolver resolver) internal {
        // Get the subdomain so we can configure it
        ens.setSubnodeOwner(node, label, address(this));

        bytes32 subnode = keccak256(abi.encodePacked(node, label));
        // Set the subdomain's resolver
        ens.setResolver(subnode, address(resolver));

        // Set the address record on the resolver
        resolver.setAddr(subnode, subdomainOwner);

        // Pass ownership of the new subdomain to the registrant
        ens.setOwner(subnode, subdomainOwner);
    }

    function supportsInterface(bytes4 interfaceID) public pure returns (bool) {
        return (
            (interfaceID == 0x01ffc9a7) // supportsInterface(bytes4)
            || (interfaceID == 0xc1b15f5a) // RegistrarInterface
        );
    }

    function rentDue(bytes32 label, string calldata subdomain) external view returns (uint timestamp) {
        return 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
    }

    /**
     * @dev Sets the resolver record for a name in ENS.
     * @param name The name to set the resolver for.
     * @param resolver The address of the resolver
     */
    function setResolver(string memory name, address resolver) public owner_only(keccak256(bytes(name))) {
        bytes32 label = keccak256(bytes(name));
        bytes32 node = keccak256(abi.encodePacked(TLD_NODE, label));
        ens.setResolver(node, resolver);
    }

    /**
     * @dev Configures a domain for sale.
     * @param name The name to configure.
     * @param price The price in wei to charge for subdomain registrations
     * @param referralFeePPM The referral fee to offer, in parts per million
     */
    function configureDomain(string memory name, uint price, uint referralFeePPM) public {
        configureDomainFor(name, price, referralFeePPM, msg.sender, address(0x0));
    }

    /**
     * @dev Stops the registrar, disabling configuring of new domains.
     */
    function stop() public not_stopped registrar_owner_only {
        stopped = true;
    }

    /**
     * @dev Sets the address where domains are migrated to.
     * @param _migration Address of the new registrar.
     */
    function setMigrationAddress(address _migration) public registrar_owner_only {
        require(stopped);
        migration = _migration;
    }

    function transferOwnership(address newOwner) public registrar_owner_only {
        registrarOwner = newOwner;
    }

    /**
     * @dev Returns information about a subdomain.
     * @param label The label hash for the domain.
     * @param subdomain The label for the subdomain.
     * @return domain The name of the domain, or an empty string if the subdomain
     *                is unavailable.
     * @return price The price to register a subdomain, in wei.
     * @return rent The rent to retain a subdomain, in wei per second.
     * @return referralFeePPM The referral fee for the dapp, in ppm.
     */
    function query(bytes32 label, string calldata subdomain) external view returns (string memory domain, uint price, uint rent, uint referralFeePPM);

    function owner(bytes32 label) public view returns (address);
    function configureDomainFor(string memory name, uint price, uint referralFeePPM, address payable _owner, address _transfer) public;
}

// File: openzeppelin-solidity/contracts/introspection/IERC165.sol

pragma solidity ^0.5.0;

/**
 * @title IERC165
 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
 */
interface IERC165 {
    /**
     * @notice Query if a contract implements an interface
     * @param interfaceId The interface identifier, as specified in ERC-165
     * @dev Interface identification is specified in ERC-165. This function
     * uses less than 30,000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: openzeppelin-solidity/contracts/token/ERC721/IERC721.sol

pragma solidity ^0.5.0;


/**
 * @title ERC721 Non-Fungible Token Standard basic interface
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract IERC721 is IERC165 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    function balanceOf(address owner) public view returns (uint256 balance);
    function ownerOf(uint256 tokenId) public view returns (address owner);

    function approve(address to, uint256 tokenId) public;
    function getApproved(uint256 tokenId) public view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) public;
    function isApprovedForAll(address owner, address operator) public view returns (bool);

    function transferFrom(address from, address to, uint256 tokenId) public;
    function safeTransferFrom(address from, address to, uint256 tokenId) public;

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public;
}

// File: openzeppelin-solidity/contracts/token/ERC721/IERC721Receiver.sol

pragma solidity ^0.5.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
contract IERC721Receiver {
    /**
     * @notice Handle the receipt of an NFT
     * @dev The ERC721 smart contract calls this function on the recipient
     * after a `safeTransfer`. This function MUST return the function selector,
     * otherwise the caller will revert the transaction. The selector to be
     * returned can be obtained as `this.onERC721Received.selector`. This
     * function MAY throw to revert and reject the transfer.
     * Note: the ERC721 contract address is always the message sender.
     * @param operator The address which called `safeTransferFrom` function
     * @param from The address which previously owned the token
     * @param tokenId The NFT identifier which is being transferred
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes memory data)
    public returns (bytes4);
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error
 */
library SafeMath {
    /**
    * @dev Multiplies two unsigned integers, reverts on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    /**
    * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
    * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
    * @dev Adds two unsigned integers, reverts on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
    * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
    * reverts when dividing by zero.
    */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

// File: openzeppelin-solidity/contracts/utils/Address.sol

pragma solidity ^0.5.0;

/**
 * Utility library of inline functions on addresses
 */
library Address {
    /**
     * Returns whether the target address is a contract
     * @dev This function will return false if invoked during the constructor of a contract,
     * as the code is not actually created until after the constructor finishes.
     * @param account address of the account to check
     * @return whether the target address is a contract
     */
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        // XXX Currently there is no better way to check if there is a contract in an address
        // than to check the size of the code at that address.
        // See https://ethereum.stackexchange.com/a/14016/36603
        // for more details about how this works.
        // TODO Check this again before the Serenity release, because all addresses will be
        // contracts then.
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}

// File: openzeppelin-solidity/contracts/introspection/ERC165.sol

pragma solidity ^0.5.0;


/**
 * @title ERC165
 * @author Matt Condon (@shrugs)
 * @dev Implements ERC165 using a lookup table.
 */
contract ERC165 is IERC165 {
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
    /**
     * 0x01ffc9a7 ===
     *     bytes4(keccak256('supportsInterface(bytes4)'))
     */

    /**
     * @dev a mapping of interface id to whether or not it's supported
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    /**
     * @dev A contract implementing SupportsInterfaceWithLookup
     * implement ERC165 itself
     */
    constructor () internal {
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev implement supportsInterface(bytes4) using a lookup table
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev internal method for registering an interface
     */
    function _registerInterface(bytes4 interfaceId) internal {
        require(interfaceId != 0xffffffff);
        _supportedInterfaces[interfaceId] = true;
    }
}

// File: openzeppelin-solidity/contracts/token/ERC721/ERC721.sol

pragma solidity ^0.5.0;






/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721 is ERC165, IERC721 {
    using SafeMath for uint256;
    using Address for address;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

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

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

    // Mapping from owner to number of owned token
    mapping (address => uint256) private _ownedTokensCount;

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

    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;
    /*
     * 0x80ac58cd ===
     *     bytes4(keccak256('balanceOf(address)')) ^
     *     bytes4(keccak256('ownerOf(uint256)')) ^
     *     bytes4(keccak256('approve(address,uint256)')) ^
     *     bytes4(keccak256('getApproved(uint256)')) ^
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) ^
     *     bytes4(keccak256('isApprovedForAll(address,address)')) ^
     *     bytes4(keccak256('transferFrom(address,address,uint256)')) ^
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)'))
     */

    constructor () public {
        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
    }

    /**
     * @dev Gets the balance of the specified address
     * @param owner address to query the balance of
     * @return uint256 representing the amount owned by the passed address
     */
    function balanceOf(address owner) public view returns (uint256) {
        require(owner != address(0));
        return _ownedTokensCount[owner];
    }

    /**
     * @dev Gets the owner of the specified token ID
     * @param tokenId uint256 ID of the token to query the owner of
     * @return owner address currently marked as the owner of the given token ID
     */
    function ownerOf(uint256 tokenId) public view returns (address) {
        address owner = _tokenOwner[tokenId];
        require(owner != address(0));
        return owner;
    }

    /**
     * @dev Approves another address to transfer the given token ID
     * The zero address indicates there is no approved address.
     * There can only be one approved address per token at a given time.
     * Can only be called by the token owner or an approved operator.
     * @param to address to be approved for the given token ID
     * @param tokenId uint256 ID of the token to be approved
     */
    function approve(address to, uint256 tokenId) public {
        address owner = ownerOf(tokenId);
        require(to != owner);
        require(msg.sender == owner || isApprovedForAll(owner, msg.sender));

        _tokenApprovals[tokenId] = to;
        emit Approval(owner, to, tokenId);
    }

    /**
     * @dev Gets the approved address for a token ID, or zero if no address set
     * Reverts if the token ID does not exist.
     * @param tokenId uint256 ID of the token to query the approval of
     * @return address currently approved for the given token ID
     */
    function getApproved(uint256 tokenId) public view returns (address) {
        require(_exists(tokenId));
        return _tokenApprovals[tokenId];
    }

    /**
     * @dev Sets or unsets the approval of a given operator
     * An operator is allowed to transfer all tokens of the sender on their behalf
     * @param to operator address to set the approval
     * @param approved representing the status of the approval to be set
     */
    function setApprovalForAll(address to, bool approved) public {
        require(to != msg.sender);
        _operatorApprovals[msg.sender][to] = approved;
        emit ApprovalForAll(msg.sender, to, approved);
    }

    /**
     * @dev Tells whether an operator is approved by a given owner
     * @param owner owner address which you want to query the approval of
     * @param operator operator address which you want to query the approval of
     * @return bool whether the given operator is approved by the given owner
     */
    function isApprovedForAll(address owner, address operator) public view returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev Transfers the ownership of a given token ID to another address
     * Usage of this method is discouraged, use `safeTransferFrom` whenever possible
     * Requires the msg sender to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
    */
    function transferFrom(address from, address to, uint256 tokenId) public {
        require(_isApprovedOrOwner(msg.sender, tokenId));

        _transferFrom(from, to, tokenId);
    }

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement `onERC721Received`,
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     *
     * Requires the msg sender to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
    */
    function safeTransferFrom(address from, address to, uint256 tokenId) public {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement `onERC721Received`,
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the msg sender to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes data to send along with a safe transfer check
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public {
        transferFrom(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data));
    }

    /**
     * @dev Returns whether the specified token exists
     * @param tokenId uint256 ID of the token to query the existence of
     * @return whether the token exists
     */
    function _exists(uint256 tokenId) internal view returns (bool) {
        address owner = _tokenOwner[tokenId];
        return owner != address(0);
    }

    /**
     * @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 returns (bool) {
        address owner = ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Internal function to mint a new token
     * Reverts if the given token ID already exists
     * @param to The address that will own the minted token
     * @param tokenId uint256 ID of the token to be minted
     */
    function _mint(address to, uint256 tokenId) internal {
        require(to != address(0));
        require(!_exists(tokenId));

        _tokenOwner[tokenId] = to;
        _ownedTokensCount[to] = _ownedTokensCount[to].add(1);

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

    /**
     * @dev Internal function to burn a specific token
     * Reverts if the token does not exist
     * Deprecated, use _burn(uint256) instead.
     * @param owner owner of the token to burn
     * @param tokenId uint256 ID of the token being burned
     */
    function _burn(address owner, uint256 tokenId) internal {
        require(ownerOf(tokenId) == owner);

        _clearApproval(tokenId);

        _ownedTokensCount[owner] = _ownedTokensCount[owner].sub(1);
        _tokenOwner[tokenId] = address(0);

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

    /**
     * @dev Internal function to burn a specific token
     * Reverts if the token does not exist
     * @param tokenId uint256 ID of the token being burned
     */
    function _burn(uint256 tokenId) internal {
        _burn(ownerOf(tokenId), tokenId);
    }

    /**
     * @dev Internal function to transfer ownership of a given token ID to another address.
     * As opposed to transferFrom, this imposes no restrictions on msg.sender.
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
    */
    function _transferFrom(address from, address to, uint256 tokenId) internal {
        require(ownerOf(tokenId) == from);
        require(to != address(0));

        _clearApproval(tokenId);

        _ownedTokensCount[from] = _ownedTokensCount[from].sub(1);
        _ownedTokensCount[to] = _ownedTokensCount[to].add(1);

        _tokenOwner[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Internal function to invoke `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 whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        internal returns (bool)
    {
        if (!to.isContract()) {
            return true;
        }

        bytes4 retval = IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data);
        return (retval == _ERC721_RECEIVED);
    }

    /**
     * @dev Private function to clear current approval of a given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function _clearApproval(uint256 tokenId) private {
        if (_tokenApprovals[tokenId] != address(0)) {
            _tokenApprovals[tokenId] = address(0);
        }
    }
}

// File: openzeppelin-solidity/contracts/ownership/Ownable.sol

pragma solidity ^0.5.0;

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address private _owner;

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

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

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

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

    /**
     * @return true if `msg.sender` is the owner of the contract.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * @notice Renouncing to ownership will leave the contract without an owner.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0));
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @ensdomains/ethregistrar/contracts/BaseRegistrar.sol

pragma solidity >=0.4.24;




contract BaseRegistrar is IERC721, Ownable {
    uint constant public GRACE_PERIOD = 90 days;

    event ControllerAdded(address indexed controller);
    event ControllerRemoved(address indexed controller);
    event NameMigrated(uint256 indexed id, address indexed owner, uint expires);
    event NameRegistered(uint256 indexed id, address indexed owner, uint expires);
    event NameRenewed(uint256 indexed id, uint expires);

    // 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;

    // 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(uint);

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

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

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

    /**
     * @dev Reclaim ownership of a name in ENS, if you own it in the registrar.
     */
    function reclaim(uint256 id, address owner) external;
}

// File: @ensdomains/ethregistrar/contracts/BaseRegistrarImplementation.sol

pragma solidity ^0.5.0;




contract BaseRegistrarImplementation is BaseRegistrar, ERC721 {
    // A map of expiry times
    mapping(uint256=>uint) expiries;

    bytes4 constant private INTERFACE_META_ID = bytes4(keccak256("supportsInterface(bytes4)"));
    bytes4 constant private 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 constant private RECLAIM_ID = bytes4(keccak256("reclaim(uint256,address)"));

    constructor(ENS _ens, bytes32 _baseNode) public {
        ens = _ens;
        baseNode = _baseNode;
    }

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

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

    /**
     * @dev Gets the owner of the specified token ID. Names become unowned
     *      when their registration expires.
     * @param tokenId uint256 ID of the token to query the owner of
     * @return address currently marked as the owner of the given token ID
     */
    function ownerOf(uint256 tokenId) public view returns (address) {
        require(expiries[tokenId] > now);
        return super.ownerOf(tokenId);
    }

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

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

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

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

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

    /**
     * @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, uint duration) external returns(uint) {
      return _register(id, owner, duration, true);
    }

    /**
     * @dev Register a name, without modifying the registry.
     * @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 registerOnly(uint256 id, address owner, uint duration) external returns(uint) {
      return _register(id, owner, duration, false);
    }

    function _register(uint256 id, address owner, uint duration, bool updateRegistry) internal live onlyController returns(uint) {
        require(available(id));
        require(now + duration + GRACE_PERIOD > now + GRACE_PERIOD); // Prevent future overflow

        expiries[id] = now + duration;
        if(_exists(id)) {
            // Name was previously owned, and expired
            _burn(id);
        }
        _mint(owner, id);
        if(updateRegistry) {
            ens.setSubnodeOwner(baseNode, bytes32(id), owner);
        }

        emit NameRegistered(id, owner, now + duration);

        return now + duration;
    }

    function renew(uint256 id, uint duration) external live onlyController returns(uint) {
        require(expiries[id] + GRACE_PERIOD >= now); // 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 supportsInterface(bytes4 interfaceID) external view returns (bool) {
        return interfaceID == INTERFACE_META_ID ||
               interfaceID == ERC721_ID ||
               interfaceID == RECLAIM_ID;
    }
}

// File: @ensdomains/ens/contracts/DeedImplementation.sol

pragma solidity ^0.5.0;


/**
 * @title Deed to hold ether in exchange for ownership of a node
 * @dev The deed can be controlled only by the registrar and can only send ether back to the owner.
 */
contract DeedImplementation is Deed {

    address payable constant burn = address(0xdead);

    address payable private _owner;
    address private _previousOwner;
    address private _registrar;

    uint private _creationDate;
    uint private _value;

    bool active;

    event OwnerChanged(address newOwner);
    event DeedClosed();

    modifier onlyRegistrar {
        require(msg.sender == _registrar);
        _;
    }

    modifier onlyActive {
        require(active);
        _;
    }

    constructor(address payable initialOwner) public payable {
        _owner = initialOwner;
        _registrar = msg.sender;
        _creationDate = now;
        active = true;
        _value = msg.value;
    }

    function setOwner(address payable newOwner) external onlyRegistrar {
        require(newOwner != address(0x0));
        _previousOwner = _owner;  // This allows contracts to check who sent them the ownership
        _owner = newOwner;
        emit OwnerChanged(newOwner);
    }

    function setRegistrar(address newRegistrar) external onlyRegistrar {
        _registrar = newRegistrar;
    }

    function setBalance(uint newValue, bool throwOnFailure) external onlyRegistrar onlyActive {
        // Check if it has enough balance to set the value
        require(_value >= newValue);
        _value = newValue;
        // Send the difference to the owner
        require(_owner.send(address(this).balance - newValue) || !throwOnFailure);
    }

    /**
     * @dev Close a deed and refund a specified fraction of the bid value
     *
     * @param refundRatio The amount*1/1000 to refund
     */
    function closeDeed(uint refundRatio) external onlyRegistrar onlyActive {
        active = false;
        require(burn.send(((1000 - refundRatio) * address(this).balance)/1000));
        emit DeedClosed();
        _destroyDeed();
    }

    /**
     * @dev Close a deed and refund a specified fraction of the bid value
     */
    function destroyDeed() external {
        _destroyDeed();
    }

    function owner() external view returns (address) {
        return _owner;
    }

    function previousOwner() external view returns (address) {
        return _previousOwner;
    }

    function value() external view returns (uint) {
        return _value;
    }

    function creationDate() external view returns (uint) {
        _creationDate;
    }

    function _destroyDeed() internal {
        require(!active);

        // Instead of selfdestruct(owner), invoke owner fallback function to allow
        // owner to log an event if desired; but owner should also be aware that
        // its fallback function can also be invoked by setBalance
        if (_owner.send(address(this).balance)) {
            selfdestruct(burn);
        }
    }
}

// File: @ensdomains/ens/contracts/HashRegistrar.sol

pragma solidity ^0.5.0;


/*

Temporary Hash Registrar
========================

This is a simplified version of a hash registrar. It is purporsefully limited:
names cannot be six letters or shorter, new auctions will stop after 4 years.

The plan is to test the basic features and then move to a new contract in at most
2 years, when some sort of renewal mechanism will be enabled.
*/




/**
 * @title Registrar
 * @dev The registrar handles the auction process for each subnode of the node it owns.
 */
contract HashRegistrar is Registrar {
    ENS public ens;
    bytes32 public rootNode;

    mapping (bytes32 => Entry) _entries;
    mapping (address => mapping (bytes32 => Deed)) public sealedBids;

    uint32 constant totalAuctionLength = 5 days;
    uint32 constant revealPeriod = 48 hours;
    uint32 public constant launchLength = 8 weeks;

    uint constant minPrice = 0.01 ether;
    uint public registryStarted;

    struct Entry {
        Deed deed;
        uint registrationDate;
        uint value;
        uint highestBid;
    }

    modifier inState(bytes32 _hash, Mode _state) {
        require(state(_hash) == _state);
        _;
    }

    modifier onlyOwner(bytes32 _hash) {
        require(state(_hash) == Mode.Owned && msg.sender == _entries[_hash].deed.owner());
        _;
    }

    modifier registryOpen() {
        require(now >= registryStarted && now <= registryStarted + (365 * 4) * 1 days && ens.owner(rootNode) == address(this));
        _;
    }

    /**
     * @dev Constructs a new Registrar, with the provided address as the owner of the root node.
     *
     * @param _ens The address of the ENS
     * @param _rootNode The hash of the rootnode.
     */
    constructor(ENS _ens, bytes32 _rootNode, uint _startDate) public {
        ens = _ens;
        rootNode = _rootNode;
        registryStarted = _startDate > 0 ? _startDate : now;
    }

    /**
     * @dev Start an auction for an available hash
     *
     * @param _hash The hash to start an auction on
     */
    function startAuction(bytes32 _hash) external {
        _startAuction(_hash);
    }

    /**
     * @dev Start multiple auctions for better anonymity
     *
     * Anyone can start an auction by sending an array of hashes that they want to bid for.
     * Arrays are sent so that someone can open up an auction for X dummy hashes when they
     * are only really interested in bidding for one. This will increase the cost for an
     * attacker to simply bid blindly on all new auctions. Dummy auctions that are
     * open but not bid on are closed after a week.
     *
     * @param _hashes An array of hashes, at least one of which you presumably want to bid on
     */
    function startAuctions(bytes32[] calldata _hashes) external {
        _startAuctions(_hashes);
    }

    /**
     * @dev Submit a new sealed bid on a desired hash in a blind auction
     *
     * Bids are sent by sending a message to the main contract with a hash and an amount. The hash
     * contains information about the bid, including the bidded hash, the bid amount, and a random
     * salt. Bids are not tied to any one auction until they are revealed. The value of the bid
     * itself can be masqueraded by sending more than the value of your actual bid. This is
     * followed by a 48h reveal period. Bids revealed after this period will be burned and the ether unrecoverable.
     * Since this is an auction, it is expected that most public hashes, like known domains and common dictionary
     * words, will have multiple bidders pushing the price up.
     *
     * @param sealedBid A sealedBid, created by the shaBid function
     */
    function newBid(bytes32 sealedBid) external payable {
        _newBid(sealedBid);
    }

    /**
     * @dev Start a set of auctions and bid on one of them
     *
     * This method functions identically to calling `startAuctions` followed by `newBid`,
     * but all in one transaction.
     *
     * @param hashes A list of hashes to start auctions on.
     * @param sealedBid A sealed bid for one of the auctions.
     */
    function startAuctionsAndBid(bytes32[] calldata hashes, bytes32 sealedBid) external payable {
        _startAuctions(hashes);
        _newBid(sealedBid);
    }

    /**
     * @dev Submit the properties of a bid to reveal them
     *
     * @param _hash The node in the sealedBid
     * @param _value The bid amount in the sealedBid
     * @param _salt The sale in the sealedBid
     */
    function unsealBid(bytes32 _hash, uint _value, bytes32 _salt) external {
        bytes32 seal = shaBid(_hash, msg.sender, _value, _salt);
        Deed bid = sealedBids[msg.sender][seal];
        require(address(bid) != address(0x0));

        sealedBids[msg.sender][seal] = Deed(address(0x0));
        Entry storage h = _entries[_hash];
        uint value = min(_value, bid.value());
        bid.setBalance(value, true);

        Mode auctionState = state(_hash);
        if (auctionState == Mode.Owned) {
            // Too late! Bidder loses their bid. Gets 0.5% back.
            bid.closeDeed(5);
            emit BidRevealed(_hash, msg.sender, value, 1);
        } else if (auctionState != Mode.Reveal) {
            // Invalid phase
            revert();
        } else if (value < minPrice || bid.creationDate() > h.registrationDate - revealPeriod) {
            // Bid too low or too late, refund 99.5%
            bid.closeDeed(995);
            emit BidRevealed(_hash, msg.sender, value, 0);
        } else if (value > h.highestBid) {
            // New winner
            // Cancel the other bid, refund 99.5%
            if (address(h.deed) != address(0x0)) {
                Deed previousWinner = h.deed;
                previousWinner.closeDeed(995);
            }

            // Set new winner
            // Per the rules of a vickery auction, the value becomes the previous highestBid
            h.value = h.highestBid;  // will be zero if there's only 1 bidder
            h.highestBid = value;
            h.deed = bid;
            emit BidRevealed(_hash, msg.sender, value, 2);
        } else if (value > h.value) {
            // Not winner, but affects second place
            h.value = value;
            bid.closeDeed(995);
            emit BidRevealed(_hash, msg.sender, value, 3);
        } else {
            // Bid doesn't affect auction
            bid.closeDeed(995);
            emit BidRevealed(_hash, msg.sender, value, 4);
        }
    }

    /**
     * @dev Cancel a bid
     *
     * @param seal The value returned by the shaBid function
     */
    function cancelBid(address bidder, bytes32 seal) external {
        Deed bid = sealedBids[bidder][seal];
        
        // If a sole bidder does not `unsealBid` in time, they have a few more days
        // where they can call `startAuction` (again) and then `unsealBid` during
        // the revealPeriod to get back their bid value.
        // For simplicity, they should call `startAuction` within
        // 9 days (2 weeks - totalAuctionLength), otherwise their bid will be
        // cancellable by anyone.
        require(address(bid) != address(0x0) && now >= bid.creationDate() + totalAuctionLength + 2 weeks);

        // Send the canceller 0.5% of the bid, and burn the rest.
        bid.setOwner(msg.sender);
        bid.closeDeed(5);
        sealedBids[bidder][seal] = Deed(0);
        emit BidRevealed(seal, bidder, 0, 5);
    }

    /**
     * @dev Finalize an auction after the registration date has passed
     *
     * @param _hash The hash of the name the auction is for
     */
    function finalizeAuction(bytes32 _hash) external onlyOwner(_hash) {
        Entry storage h = _entries[_hash];
        
        // Handles the case when there's only a single bidder (h.value is zero)
        h.value = max(h.value, minPrice);
        h.deed.setBalance(h.value, true);

        trySetSubnodeOwner(_hash, h.deed.owner());
        emit HashRegistered(_hash, h.deed.owner(), h.value, h.registrationDate);
    }

    /**
     * @dev The owner of a domain may transfer it to someone else at any time.
     *
     * @param _hash The node to transfer
     * @param newOwner The address to transfer ownership to
     */
    function transfer(bytes32 _hash, address payable newOwner) external onlyOwner(_hash) {
        require(newOwner != address(0x0));

        Entry storage h = _entries[_hash];
        h.deed.setOwner(newOwner);
        trySetSubnodeOwner(_hash, newOwner);
    }

    /**
     * @dev After some time, or if we're no longer the registrar, the owner can release
     *      the name and get their ether back.
     *
     * @param _hash The node to release
     */
    function releaseDeed(bytes32 _hash) external onlyOwner(_hash) {
        Entry storage h = _entries[_hash];
        Deed deedContract = h.deed;

        require(now >= h.registrationDate + 365 days || ens.owner(rootNode) != address(this));

        h.value = 0;
        h.highestBid = 0;
        h.deed = Deed(0);

        _tryEraseSingleNode(_hash);
        deedContract.closeDeed(1000);
        emit HashReleased(_hash, h.value);        
    }

    /**
     * @dev Submit a name 6 characters long or less. If it has been registered,
     *      the submitter will earn 50% of the deed value. 
     * 
     * We are purposefully handicapping the simplified registrar as a way 
     * to force it into being restructured in a few years.
     *
     * @param unhashedName An invalid name to search for in the registry.
     */
    function invalidateName(string calldata unhashedName)
        external
        inState(keccak256(abi.encode(unhashedName)), Mode.Owned)
    {
        require(strlen(unhashedName) <= 6);
        bytes32 hash = keccak256(abi.encode(unhashedName));

        Entry storage h = _entries[hash];

        _tryEraseSingleNode(hash);

        if (address(h.deed) != address(0x0)) {
            // Reward the discoverer with 50% of the deed
            // The previous owner gets 50%
            h.value = max(h.value, minPrice);
            h.deed.setBalance(h.value/2, false);
            h.deed.setOwner(msg.sender);
            h.deed.closeDeed(1000);
        }

        emit HashInvalidated(hash, unhashedName, h.value, h.registrationDate);

        h.value = 0;
        h.highestBid = 0;
        h.deed = Deed(0);
    }

    /**
     * @dev Allows anyone to delete the owner and resolver records for a (subdomain of) a
     *      name that is not currently owned in the registrar. If passing, eg, 'foo.bar.eth',
     *      the owner and resolver fields on 'foo.bar.eth' and 'bar.eth' will all be cleared.
     *
     * @param labels A series of label hashes identifying the name to zero out, rooted at the
     *        registrar's root. Must contain at least one element. For instance, to zero 
     *        'foo.bar.eth' on a registrar that owns '.eth', pass an array containing
     *        [keccak256('foo'), keccak256('bar')].
     */
    function eraseNode(bytes32[] calldata labels) external {
        require(labels.length != 0);
        require(state(labels[labels.length - 1]) != Mode.Owned);

        _eraseNodeHierarchy(labels.length - 1, labels, rootNode);
    }

    /**
     * @dev Transfers the deed to the current registrar, if different from this one.
     *
     * Used during the upgrade process to a permanent registrar.
     *
     * @param _hash The name hash to transfer.
     */
    function transferRegistrars(bytes32 _hash) external onlyOwner(_hash) {
        address registrar = ens.owner(rootNode);
        require(registrar != address(this));

        // Migrate the deed
        Entry storage h = _entries[_hash];
        h.deed.setRegistrar(registrar);

        // Call the new registrar to accept the transfer
        Registrar(registrar).acceptRegistrarTransfer(_hash, h.deed, h.registrationDate);

        // Zero out the Entry
        h.deed = Deed(0);
        h.registrationDate = 0;
        h.value = 0;
        h.highestBid = 0;
    }

    /**
     * @dev Accepts a transfer from a previous registrar; stubbed out here since there
     *      is no previous registrar implementing this interface.
     *
     * @param hash The sha3 hash of the label to transfer.
     * @param deed The Deed object for the name being transferred in.
     * @param registrationDate The date at which the name was originally registered.
     */
    function acceptRegistrarTransfer(bytes32 hash, Deed deed, uint registrationDate) external {
        hash; deed; registrationDate; // Don't warn about unused variables
    }

    function entries(bytes32 _hash) external view returns (Mode, address, uint, uint, uint) {
        Entry storage h = _entries[_hash];
        return (state(_hash), address(h.deed), h.registrationDate, h.value, h.highestBid);
    }

    // State transitions for names:
    //   Open -> Auction (startAuction)
    //   Auction -> Reveal
    //   Reveal -> Owned
    //   Reveal -> Open (if nobody bid)
    //   Owned -> Open (releaseDeed or invalidateName)
    function state(bytes32 _hash) public view returns (Mode) {
        Entry storage entry = _entries[_hash];

        if (!isAllowed(_hash, now)) {
            return Mode.NotYetAvailable;
        } else if (now < entry.registrationDate) {
            if (now < entry.registrationDate - revealPeriod) {
                return Mode.Auction;
            } else {
                return Mode.Reveal;
            }
        } else {
            if (entry.highestBid == 0) {
                return Mode.Open;
            } else {
                return Mode.Owned;
            }
        }
    }

    /**
     * @dev Determines if a name is available for registration yet
     *
     * Each name will be assigned a random date in which its auction
     * can be started, from 0 to 8 weeks
     *
     * @param _hash The hash to start an auction on
     * @param _timestamp The timestamp to query about
     */
    function isAllowed(bytes32 _hash, uint _timestamp) public view returns (bool allowed) {
        return _timestamp > getAllowedTime(_hash);
    }

    /**
     * @dev Returns available date for hash
     *
     * The available time from the `registryStarted` for a hash is proportional
     * to its numeric value.
     *
     * @param _hash The hash to start an auction on
     */
    function getAllowedTime(bytes32 _hash) public view returns (uint) {
        return registryStarted + ((launchLength * (uint(_hash) >> 128)) >> 128);
        // Right shift operator: a >> b == a / 2**b
    }

    /**
     * @dev Hash the values required for a secret bid
     *
     * @param hash The node corresponding to the desired namehash
     * @param value The bid amount
     * @param salt A random value to ensure secrecy of the bid
     * @return The hash of the bid values
     */
    function shaBid(bytes32 hash, address owner, uint value, bytes32 salt) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(hash, owner, value, salt));
    }

    function _tryEraseSingleNode(bytes32 label) internal {
        if (ens.owner(rootNode) == address(this)) {
            ens.setSubnodeOwner(rootNode, label, address(this));
            bytes32 node = keccak256(abi.encodePacked(rootNode, label));
            ens.setResolver(node, address(0x0));
            ens.setOwner(node, address(0x0));
        }
    }

    function _startAuction(bytes32 _hash) internal registryOpen() {
        Mode mode = state(_hash);
        if (mode == Mode.Auction) return;
        require(mode == Mode.Open);

        Entry storage newAuction = _entries[_hash];
        newAuction.registrationDate = now + totalAuctionLength;
        newAuction.value = 0;
        newAuction.highestBid = 0;
        emit AuctionStarted(_hash, newAuction.registrationDate);
    }

    function _startAuctions(bytes32[] memory _hashes) internal {
        for (uint i = 0; i < _hashes.length; i ++) {
            _startAuction(_hashes[i]);
        }
    }

    function _newBid(bytes32 sealedBid) internal {
        require(address(sealedBids[msg.sender][sealedBid]) == address(0x0));
        require(msg.value >= minPrice);

        // Creates a new hash contract with the owner
        Deed bid = (new DeedImplementation).value(msg.value)(msg.sender);
        sealedBids[msg.sender][sealedBid] = bid;
        emit NewBid(sealedBid, msg.sender, msg.value);
    }

    function _eraseNodeHierarchy(uint idx, bytes32[] memory labels, bytes32 node) internal {
        // Take ownership of the node
        ens.setSubnodeOwner(node, labels[idx], address(this));
        node = keccak256(abi.encodePacked(node, labels[idx]));

        // Recurse if there are more labels
        if (idx > 0) {
            _eraseNodeHierarchy(idx - 1, labels, node);
        }

        // Erase the resolver and owner records
        ens.setResolver(node, address(0x0));
        ens.setOwner(node, address(0x0));
    }

    /**
     * @dev Assign the owner in ENS, if we're still the registrar
     *
     * @param _hash hash to change owner
     * @param _newOwner new owner to transfer to
     */
    function trySetSubnodeOwner(bytes32 _hash, address _newOwner) internal {
        if (ens.owner(rootNode) == address(this))
            ens.setSubnodeOwner(rootNode, _hash, _newOwner);
    }

    /**
     * @dev Returns the maximum of two unsigned integers
     *
     * @param a A number to compare
     * @param b A number to compare
     * @return The maximum of two unsigned integers
     */
    function max(uint a, uint b) internal pure returns (uint) {
        if (a > b)
            return a;
        else
            return b;
    }

    /**
     * @dev Returns the minimum of two unsigned integers
     *
     * @param a A number to compare
     * @param b A number to compare
     * @return The minimum of two unsigned integers
     */
    function min(uint a, uint b) internal pure returns (uint) {
        if (a < b)
            return a;
        else
            return b;
    }

    /**
     * @dev Returns the length of a given string
     *
     * @param s The string to measure the length of
     * @return The length of the input string
     */
    function strlen(string memory s) internal pure returns (uint) {
        s; // Don't warn about unused variables
        // Starting here means the LSB will be the byte we care about
        uint ptr;
        uint end;
        assembly {
            ptr := add(s, 1)
            end := add(mload(s), ptr)
        }
        uint len = 0;
        for (len; ptr < end; len++) {
            uint8 b;
            assembly { b := and(mload(ptr), 0xFF) }
            if (b < 0x80) {
                ptr += 1;
            } else if (b < 0xE0) {
                ptr += 2;
            } else if (b < 0xF0) {
                ptr += 3;
            } else if (b < 0xF8) {
                ptr += 4;
            } else if (b < 0xFC) {
                ptr += 5;
            } else {
                ptr += 6;
            }
        }
        return len;
    }

}

// File: @ensdomains/ethregistrar/contracts/OldBaseRegistrarImplementation.sol

pragma solidity ^0.5.0;






contract OldBaseRegistrarImplementation is BaseRegistrar, ERC721 {
    // Expiration timestamp for migrated domains.
    uint public transferPeriodEnds;

    // The interim registrar
    Registrar public previousRegistrar;

    // A map of expiry times
    mapping(uint256=>uint) expiries;

    uint constant public MIGRATION_LOCK_PERIOD = 28 days;

    bytes4 constant private INTERFACE_META_ID = bytes4(keccak256("supportsInterface(bytes4)"));
    bytes4 constant private ERC721_ID = bytes4(
        keccak256("balanceOf(uint256)") ^
        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 constant private RECLAIM_ID = bytes4(keccak256("reclaim(uint256,address)"));

    constructor(ENS _ens, HashRegistrar _previousRegistrar, bytes32 _baseNode, uint _transferPeriodEnds) public {
        // Require that people have time to transfer names over.
        require(_transferPeriodEnds > now + 2 * MIGRATION_LOCK_PERIOD);

        ens = _ens;
        baseNode = _baseNode;
        previousRegistrar = _previousRegistrar;
        transferPeriodEnds = _transferPeriodEnds;
    }

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

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

    /**
     * @dev Gets the owner of the specified token ID. Names become unowned
     *      when their registration expires.
     * @param tokenId uint256 ID of the token to query the owner of
     * @return address currently marked as the owner of the given token ID
     */
    function ownerOf(uint256 tokenId) public view returns (address) {
        require(expiries[tokenId] > now);
        return super.ownerOf(tokenId);
    }

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

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

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

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

    // Returns true iff the specified name is available for registration.
    function available(uint256 id) public view returns(bool) {
        // Not available if it's registered here or in its grace period.
        if(expiries[id] + GRACE_PERIOD >= now) {
            return false;
        }
        // Available if we're past the transfer period, or the name isn't
        // registered in the legacy registrar.
        return now > transferPeriodEnds || previousRegistrar.state(bytes32(id)) == Registrar.Mode.Open;
    }

    /**
     * @dev Register a name.
     */
    function register(uint256 id, address owner, uint duration) external returns(uint) {
      return _register(id, owner, duration, true);
    }

    /**
     * @dev Register a name.
     */
    function registerOnly(uint256 id, address owner, uint duration) external returns(uint) {
      return _register(id, owner, duration, false);
    }

    /**
     * @dev Register a name.
     */
    function _register(uint256 id, address owner, uint duration, bool updateRegistry) internal live onlyController returns(uint) {
        require(available(id));
        require(now + duration + GRACE_PERIOD > now + GRACE_PERIOD); // Prevent future overflow

        expiries[id] = now + duration;
        if(_exists(id)) {
            // Name was previously owned, and expired
            _burn(id);
        }
        _mint(owner, id);
        if(updateRegistry) {
            ens.setSubnodeOwner(baseNode, bytes32(id), owner);
        }

        emit NameRegistered(id, owner, now + duration);

        return now + duration;
    }

    function renew(uint256 id, uint duration) external live onlyController returns(uint) {
        require(expiries[id] + GRACE_PERIOD >= now); // 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);
    }

    /**
     * @dev Transfers a registration from the initial registrar.
     * This function is called by the initial registrar when a user calls `transferRegistrars`.
     */
    function acceptRegistrarTransfer(bytes32 label, Deed deed, uint) external live {
        uint256 id = uint256(label);

        require(msg.sender == address(previousRegistrar));
        require(expiries[id] == 0);
        require(transferPeriodEnds > now);

        uint registrationDate;
        (,,registrationDate,,) = previousRegistrar.entries(label);
        require(registrationDate < now - MIGRATION_LOCK_PERIOD);

        address owner = deed.owner();

        // Destroy the deed and transfer the funds back to the registrant.
        deed.closeDeed(1000);

        // Register the name
        expiries[id] = transferPeriodEnds;
        _mint(owner, id);

        ens.setSubnodeOwner(baseNode, label, owner);

        emit NameMigrated(id, owner, transferPeriodEnds);
        emit NameRegistered(id, owner, transferPeriodEnds);
    }

    function supportsInterface(bytes4 interfaceID) external view returns (bool) {
        return interfaceID == INTERFACE_META_ID ||
               interfaceID == ERC721_ID ||
               interfaceID == RECLAIM_ID;
    }
}

// File: @ensdomains/ethregistrar/contracts/RegistrarMigration.sol

pragma solidity ^0.5.0;






contract RegistrarMigration {
    using SafeMath for uint;

    bytes constant private UNUSED_SUBDOMAIN = hex'ffffffffffffffff';

    Registrar public legacyRegistrar;
    uint transferPeriodEnds;
    OldBaseRegistrarImplementation public oldRegistrar;
    BaseRegistrarImplementation public newRegistrar;
    ENS public oldENS;
    ENS public newENS;
    AbstractSubdomainRegistrar public oldSubdomainRegistrar;
    AbstractSubdomainRegistrar public newSubdomainRegistrar;

    bytes32 public baseNode;

    constructor(OldBaseRegistrarImplementation _old, BaseRegistrarImplementation _new, AbstractSubdomainRegistrar _oldSubdomainRegistrar, AbstractSubdomainRegistrar _newSubdomainRegistrar) public {
        oldRegistrar = _old;
        oldENS = _old.ens();
        baseNode = _old.baseNode();
        legacyRegistrar = _old.previousRegistrar();
        transferPeriodEnds = _old.transferPeriodEnds();
        oldSubdomainRegistrar = _oldSubdomainRegistrar;

        newRegistrar = _new;
        newENS = _new.ens();
        require(_new.baseNode() == baseNode);
        newSubdomainRegistrar = _newSubdomainRegistrar;
    }

    function doMigration(uint256 tokenId, address registrant, uint expires) internal {
        bytes32 node = keccak256(abi.encodePacked(baseNode, bytes32(tokenId)));
        address controller = oldENS.owner(node);

        if(address(registrant) != address(oldSubdomainRegistrar) && hasCode(controller)) {
            // For names controlled by a contract or not in ENS, only migrate over the registration
            newRegistrar.registerOnly(tokenId, registrant, expires.sub(now));
            return;
        }

        // Register the name on the new registry with the same expiry time.
        newRegistrar.register(tokenId, address(this), expires.sub(now));

        // Copy over resolver, TTL and owner to the new registry.
        address resolver = oldENS.resolver(node);
        if(resolver != address(0)) {
            newENS.setResolver(node, resolver);
        }

        uint64 ttl = oldENS.ttl(node);
        if(ttl != 0) {
            newENS.setTTL(node, ttl);
        }

        if(address(registrant) == address(oldSubdomainRegistrar) && address(registrant) != address(0)) {
            // Handle subdomain registrar domains
            // Fetch data from the old subdomain registrar
            (string memory label, uint price,, uint referralFeePPM) = oldSubdomainRegistrar.query(bytes32(tokenId), string(UNUSED_SUBDOMAIN));
            address owner = oldSubdomainRegistrar.owner(bytes32(tokenId));
            if(bytes(label).length == 0) {
              revert("Unable to migrate domain on subdomain registrar");
            }

            // Transfer to the new subdomain registrar
            newRegistrar.approve(address(newSubdomainRegistrar), tokenId);
            newSubdomainRegistrar.configureDomainFor(label, price, referralFeePPM, address(uint160(owner)), address(0));
        } else {
            newENS.setOwner(node, controller);

            // Transfer the registration to the registrant.
            newRegistrar.transferFrom(address(this), registrant, tokenId);
        }

        // Replace ownership on the old registry so it can't be updated any further.
        oldENS.setSubnodeOwner(baseNode, bytes32(tokenId), address(this));
    }

    /**
     * @dev Migrate a name from the previous version of the BaseRegistrar
     */
    function migrate(uint256 tokenId) public {
        address registrant = oldRegistrar.ownerOf(tokenId);
        doMigration(tokenId, registrant, oldRegistrar.nameExpires(tokenId));
    }

    /**
     * @dev Migrate a list of names from the previous version of the BaseRegistrar.
     */
    function migrateAll(uint256[] calldata tokenIds) external {
        for(uint i = 0; i < tokenIds.length; i++) {
            migrate(tokenIds[i]);
        }
    }

    /**
     * @dev Migrate a name from the legacy (auction-based) registrar.
     */
    function migrateLegacy(bytes32 label) public {
        (Registrar.Mode mode, address deed, , ,) = legacyRegistrar.entries(label);
        require(mode == Registrar.Mode.Owned);
        address owner = Deed(deed).owner();
        doMigration(uint256(label), owner, transferPeriodEnds);
    }

    /**
     * @dev Migrate a list of names from the legacy (auction-based) registrar.
     */
    function migrateAllLegacy(bytes32[] calldata labels) external {
        for(uint i = 0; i < labels.length; i++) {
            migrateLegacy(labels[i]);
        }
    }

    function hasCode(address addr) private view returns(bool ret) {
        assembly {
            ret := not(not(extcodesize(addr)))
        }
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract OldBaseRegistrarImplementation","name":"_old","type":"address"},{"internalType":"contract BaseRegistrarImplementation","name":"_new","type":"address"},{"internalType":"contract AbstractSubdomainRegistrar","name":"_oldSubdomainRegistrar","type":"address"},{"internalType":"contract AbstractSubdomainRegistrar","name":"_newSubdomainRegistrar","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"constant":true,"inputs":[],"name":"baseNode","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"legacyRegistrar","outputs":[{"internalType":"contract Registrar","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"migrate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256[]","name":"tokenIds","type":"uint256[]"}],"name":"migrateAll","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32[]","name":"labels","type":"bytes32[]"}],"name":"migrateAllLegacy","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"label","type":"bytes32"}],"name":"migrateLegacy","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"newENS","outputs":[{"internalType":"contract ENS","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"newRegistrar","outputs":[{"internalType":"contract BaseRegistrarImplementation","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"newSubdomainRegistrar","outputs":[{"internalType":"contract AbstractSubdomainRegistrar","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"oldENS","outputs":[{"internalType":"contract ENS","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"oldRegistrar","outputs":[{"internalType":"contract OldBaseRegistrarImplementation","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"oldSubdomainRegistrar","outputs":[{"internalType":"contract AbstractSubdomainRegistrar","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"}]

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000000000000000000000000fac7bea255a6990f749363002136af6556b31e0400000000000000000000000057f1887a8bf19b14fc0df6fd9b2acc9af147ea85000000000000000000000000c32659651d137a18b79925449722855aa327231d000000000000000000000000e65d8aaf34cb91087d1598e0a15b582f57f217d9

-----Decoded View---------------
Arg [0] : _old (address): 0xFaC7BEA255a6990f749363002136aF6556b31e04
Arg [1] : _new (address): 0x57f1887a8BF19b14fC0dF6Fd9B2acc9Af147eA85
Arg [2] : _oldSubdomainRegistrar (address): 0xC32659651D137A18b79925449722855aA327231d
Arg [3] : _newSubdomainRegistrar (address): 0xe65d8AAF34CB91087D1598e0A15B582F57F217d9

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000fac7bea255a6990f749363002136af6556b31e04
Arg [1] : 00000000000000000000000057f1887a8bf19b14fc0df6fd9b2acc9af147ea85
Arg [2] : 000000000000000000000000c32659651d137a18b79925449722855aa327231d
Arg [3] : 000000000000000000000000e65d8aaf34cb91087d1598e0a15b582f57f217d9

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