Overview
TokenID
8
Total Transfers
-
Market
Onchain Market Cap
-
Circulating Supply Market Cap
-
Other Info
Token Contract
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Contract Name:
ZNSRegistry
Compiler Version
v0.8.21+commit.d9974bed
Optimization Enabled:
Yes with 200 runs
Other Settings:
paris EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.21;
pragma abicoder v2;
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import { ZNSOracle } from "./ZNSOracle.sol";
import { ZNSGiftCard } from "./ZNSGiftCard.sol";
contract ZNSRegistry is
ERC721URIStorage,
Pausable,
ReentrancyGuard,
AccessControl
{
using Strings for uint256;
/*//////////////////////////////////////////////////////////////
INITIALIZATION
//////////////////////////////////////////////////////////////*/
uint256 public tokenID;
bytes32 public constant MAINTAINER_ROLE = keccak256("MAINTAINER_ROLE");
string public tld;
string public baseUri;
address[] profitSharingPartners = [
0xD00c70F9b78C63a36519C488F862DF95b7A73d90
];
uint256[] profitSharesOfPartners = [10000];
address public oracle;
address public giftCard;
struct RegistryData {
address owner;
string domainName;
uint16 lengthOfDomain;
uint256 expirationDate;
}
struct UserData {
uint256[] ownedGiftCards;
uint256 credits;
}
struct UserConfig {
uint256 primaryDomain;
uint256[] allOwnedDomains;
uint256 numberOfReferrals;
uint256 totalEarnings;
}
enum domainStatus {
AVAILABLE,
REGISTERED,
EXPIRED
}
mapping(uint256 => RegistryData) internal registryLookup;
mapping(address => UserConfig) internal userLookup;
mapping(string => uint256) public domainLookup;
mapping(uint256 => string) public idToDomain;
mapping(string => bool) public protectedDomains;
mapping(address => uint256) public partnerReferrals;
mapping(uint256 => uint256) public mintToExpire;
uint256[] public totalRegisteredDomains;
uint256[5] internal domainPricing = [990e18, 490e18, 90e18, 20e18, 5e18];
uint256[5] internal renewPricing = [99e18, 49e18, 9e18, 2e18, 5e17];
// 1 invites - 5%
// 10 invites - 10-%
// 30 invites - 15%
// 60 invites - 20%
// 100 invites - 25%
uint256[5] referTicks = [500, 1000, 1500, 2000, 2500];
constructor(
address _oracle,
address _giftCard,
string memory _symbol,
string memory _tld
) ERC721("ZNS Connect", _symbol) {
tokenID++;
_grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
_grantRole(MAINTAINER_ROLE, msg.sender);
oracle = _oracle;
giftCard = _giftCard;
tld = _tld;
baseUri = "https://api.znsconnect.io/v1/metadata";
}
/*//////////////////////////////////////////////////////////////
CUSTOM MODIFIERS
//////////////////////////////////////////////////////////////*/
modifier onlyMaintainer() {
require(
hasRole(MAINTAINER_ROLE, msg.sender),
"maintainer role required"
);
_;
}
modifier onlyAdmin() {
require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "admin role required");
_;
}
/*//////////////////////////////////////////////////////////////
CUSTOM ERRORS
//////////////////////////////////////////////////////////////*/
error InvalidLength();
error AlreadyRegistered();
error SelfReferral();
error DomainExpired();
error NotRegistered();
error cannotBeMoreThan100Percent();
error InvalidAddress();
error LengthsDoNotMatch();
error NoCredits();
error NotOwner();
error NotEnoughCredits();
error RefferalEarningCannotBeCalculated();
error DomainNotExpired();
error NotEnoughNativeTokenPaid();
error DomainIn30dayPeriod();
error PriceCannotBeZero();
error DomainExpiredButNotBurned();
error InvalidExpiry();
error DomainIsProtected();
error AmountMoreThanShare();
error InvalidDomainName();
/*//////////////////////////////////////////////////////////////
CUSTOM EVENTS
//////////////////////////////////////////////////////////////*/
event MintedDomain(
string domainName,
uint256 indexed tokenId,
address indexed owner,
uint256 indexed expiry
);
event PrimaryDomainSet(
uint256 indexed tokenId,
address indexed owner,
string domainName
);
event RenewedDomain(
uint256 indexed tokenId,
uint256 indexed expiry,
string domainName
);
event TransferredDomain(
string domainName,
uint256 indexed tokenId,
address indexed from,
address indexed to
);
/*//////////////////////////////////////////////////////////////
PUBLIC READ FUNCTIONS
//////////////////////////////////////////////////////////////*/
function registryLookupByName(
string memory domainName
) external view returns (RegistryData memory) {
if (checkDomainStatus(domainLookup[domainName]) == domainStatus.EXPIRED)
revert DomainExpired();
return registryLookup[domainLookup[domainName]];
}
function registryLookupById(
uint256 tokenId
) external view returns (RegistryData memory) {
if (checkDomainStatus(tokenId) == domainStatus.EXPIRED)
revert DomainExpired();
return registryLookup[tokenId];
}
function checkDomainStatus(
uint256 tokenId
) public view returns (domainStatus status) {
RegistryData memory _registryData = registryLookup[tokenId];
if (
_registryData.owner == address(0) &&
_registryData.expirationDate == 0 &&
_registryData.lengthOfDomain == 0
) return domainStatus.AVAILABLE;
else if (
_registryData.owner != address(0) &&
_registryData.expirationDate > block.timestamp
) return domainStatus.REGISTERED;
else if (
_registryData.owner != address(0) &&
_registryData.expirationDate < block.timestamp
) return domainStatus.EXPIRED;
}
function priceToRegister(uint16 len) public view returns (uint256) {
uint256 currentUSDPrice = getOraclePrice();
if (len <= 0 || len > 24) revert InvalidLength();
if (len == 1) return (domainPricing[0] * 1e18) / currentUSDPrice;
else if (len == 2) return (domainPricing[1] * 1e18) / currentUSDPrice;
else if (len == 3) return (domainPricing[2] * 1e18) / currentUSDPrice;
else if (len == 4) return (domainPricing[3] * 1e18) / currentUSDPrice;
else if (len >= 5 && len <= 24)
return (domainPricing[4] * 1e18) / currentUSDPrice;
else revert InvalidLength();
}
function priceToRenew(uint16 len) public view returns (uint256) {
uint256 currentUSDPrice = getOraclePrice();
if (len <= 0 || len > 24) revert InvalidLength();
if (len == 1) return (renewPricing[0] * 1e18) / currentUSDPrice;
else if (len == 2) return (renewPricing[1] * 1e18) / currentUSDPrice;
else if (len == 3) return (renewPricing[2] * 1e18) / currentUSDPrice;
else if (len == 4) return (renewPricing[3] * 1e18) / currentUSDPrice;
else if (len >= 5 && len <= 24)
return (renewPricing[4] * 1e18) / currentUSDPrice;
else revert InvalidLength();
}
function userLookupByAddress(
address user
) external view returns (UserConfig memory) {
return userLookup[user];
}
function getOraclePrice() public view returns (uint256) {
return ZNSOracle(oracle).priceToUSD();
}
function getTotalRegisteredDomains()
external
view
returns (uint256[] memory)
{
return totalRegisteredDomains;
}
/*//////////////////////////////////////////////////////////////
ADMIN WRITE FUNCTIONS
//////////////////////////////////////////////////////////////*/
function setPartnerReferral(
address referral,
uint sharePercent
) public onlyAdmin nonReentrant whenNotPaused {
if (sharePercent > 10000) {
revert cannotBeMoreThan100Percent();
}
partnerReferrals[referral] = sharePercent;
}
function setProfitSharingData(
address[] memory _partners,
uint256[] memory _percentages
) public onlyAdmin nonReentrant whenNotPaused {
if (_partners.length != _percentages.length) {
revert LengthsDoNotMatch();
}
uint256 sum;
for (uint256 i = 0; i < _percentages.length; i++) {
sum += _percentages[i];
if (isInvalidAddress(_partners[i])) revert InvalidAddress();
}
if (sum > 10000) {
revert cannotBeMoreThan100Percent();
}
profitSharingPartners = _partners;
profitSharesOfPartners = _percentages;
}
function setOracle(address _oracleAddress) public onlyAdmin nonReentrant {
if (isInvalidAddress(_oracleAddress)) revert InvalidAddress();
oracle = _oracleAddress;
}
function setGiftCard(
address _giftCardAddress
) public onlyAdmin nonReentrant {
if (isInvalidAddress(_giftCardAddress)) revert InvalidAddress();
giftCard = _giftCardAddress;
}
function setReferTicks(
uint256[5] memory _ticks
) public onlyAdmin nonReentrant whenNotPaused {
for (uint256 i = 0; i < 5; i++) {
if (_ticks[i] > 10000) {
revert cannotBeMoreThan100Percent();
}
}
referTicks = _ticks;
}
function setDomainPricing(
uint256[5] memory _domainPricing
) external onlyAdmin nonReentrant whenNotPaused {
if (_domainPricing.length != 5) revert InvalidLength();
for (uint256 i = 0; i < _domainPricing.length; i++) {
if (_domainPricing[i] == 0) revert PriceCannotBeZero();
}
domainPricing = _domainPricing;
}
function setRenewPricing(
uint256[5] memory _renewPricing
) external onlyAdmin nonReentrant {
if (_renewPricing.length != 5) revert InvalidLength();
for (uint256 i = 0; i < _renewPricing.length; i++) {
if (_renewPricing[i] == 0) revert PriceCannotBeZero();
}
renewPricing = _renewPricing;
}
function adminWithdraw() public onlyAdmin nonReentrant {
payable(msg.sender).transfer(address(this).balance);
}
function adminRegisterDomains(
address[] memory owners,
string[] memory domainNames,
uint256[] memory expiries
) public onlyAdmin nonReentrant whenNotPaused {
uint16[] memory lengthsOfDomains = new uint16[](domainNames.length);
for (uint256 i = 0; i < domainNames.length; i++) {
uint16 lengthOfDomain = uint16(strlen(domainNames[i]));
lengthsOfDomains[i] = lengthOfDomain;
}
mintDomains(owners, domainNames, lengthsOfDomains, expiries);
}
function pause() external onlyAdmin nonReentrant {
_pause();
}
function unpause() external onlyAdmin nonReentrant {
_unpause();
}
function protectDomains(
string[] memory domainNames,
bool[] memory isProtectedValues
) external onlyAdmin nonReentrant whenNotPaused {
if (domainNames.length != isProtectedValues.length) {
revert LengthsDoNotMatch();
}
for (uint256 i = 0; i < domainNames.length; i++) {
protectedDomains[domainNames[i]] = isProtectedValues[i];
}
}
function burnExpiredDomains(
uint256[] memory tokenIds
) external onlyMaintainer nonReentrant whenNotPaused {
for (uint256 i = 0; i < tokenIds.length; i++) {
uint256 tokenId = tokenIds[i];
if (registryLookup[tokenId].expirationDate > block.timestamp)
revert DomainNotExpired();
if (
registryLookup[tokenId].expirationDate + 30 days >
block.timestamp
) revert DomainIn30dayPeriod();
maintainerBurn(tokenId);
}
}
function setBaseUri(string memory _baseUri) public onlyAdmin {
baseUri = _baseUri;
}
function setTld(string memory _tld) public onlyAdmin {
tld = _tld;
}
function transferAdminRole(address _newAdmin) public onlyAdmin {
_grantRole(DEFAULT_ADMIN_ROLE, _newAdmin);
}
function transferMaintainerRole(address _newMaintainer) public onlyAdmin {
_grantRole(MAINTAINER_ROLE, _newMaintainer);
}
function transferAdminAndMaintainerRole(
address _newOwner
) public onlyAdmin {
_grantRole(DEFAULT_ADMIN_ROLE, _newOwner);
_grantRole(MAINTAINER_ROLE, _newOwner);
}
/*//////////////////////////////////////////////////////////////
PUBLIC WRITE FUNCTIONS
//////////////////////////////////////////////////////////////*/
function registerDomains(
address[] memory owners,
string[] memory domainNames,
uint256[] memory expiries,
address referral,
uint256 credits
) external payable nonReentrant whenNotPaused {
uint256 totalPrice;
uint16[] memory lengthsOfDomains = new uint16[](domainNames.length);
for (uint256 i = 0; i < domainNames.length; i++) {
uint256 expiry = expiries[i];
string memory domainName = domainNames[i];
if (!isValidDomainName(domainName)) {
revert InvalidDomainName();
}
if (protectedDomains[domainName]) revert DomainIsProtected();
uint16 lengthOfDomain = uint16(strlen(domainName));
lengthsOfDomains[i] = lengthOfDomain;
if (!isValidLength(lengthOfDomain)) revert InvalidLength();
if (referral == msg.sender) revert SelfReferral();
uint256 price = priceToRegister(lengthOfDomain);
totalPrice += price;
if (expiry > 1) {
totalPrice += priceToRenew(lengthOfDomain) * (expiry - 1);
}
}
if (credits > 0) {
if (ZNSGiftCard(giftCard).getUserCredits(msg.sender) < credits) {
revert NotEnoughCredits();
}
uint256 creditValue = getValueFromCredits(credits);
ZNSGiftCard(giftCard).registryBurnCredits(msg.sender, credits);
totalPrice -= creditValue;
}
if (msg.value < totalPrice) revert NotEnoughNativeTokenPaid();
uint256 earnings = totalPrice;
if (referral != address(0)) {
uint256 referralBand = getReferralBand(referral);
uint256 referralInBIPS = calculateActualFromBIPS(
totalPrice,
referralBand
);
userLookup[referral].numberOfReferrals += domainNames.length;
userLookup[referral].totalEarnings += referralInBIPS;
payable(referral).transfer(referralInBIPS);
earnings -= referralInBIPS;
}
for (uint256 i = 0; i < profitSharingPartners.length; i++) {
payable(profitSharingPartners[i]).transfer(
calculateActualFromBIPS(earnings, profitSharesOfPartners[i])
);
}
mintDomains(owners, domainNames, lengthsOfDomains, expiries);
}
function renewDomain(
uint256 _tokenId,
uint256 _years
) external payable nonReentrant whenNotPaused {
if (registryLookup[_tokenId].owner != msg.sender) revert NotOwner();
if (_years == 0) revert InvalidExpiry();
uint256 price = priceToRenew(registryLookup[_tokenId].lengthOfDomain) *
_years;
if (msg.value < price) revert NotEnoughNativeTokenPaid();
for (uint256 i = 0; i < profitSharingPartners.length; i++) {
payable(profitSharingPartners[i]).transfer(
calculateActualFromBIPS(price, profitSharesOfPartners[i])
);
}
registryLookup[_tokenId].expirationDate += 365 days * _years;
emit RenewedDomain(
_tokenId,
registryLookup[_tokenId].expirationDate,
addTLD(registryLookup[_tokenId].domainName)
);
}
function setPrimaryDomain(
uint256 _tokenId
) external nonReentrant whenNotPaused {
address owner = registryLookup[_tokenId].owner;
if (owner != msg.sender) revert NotOwner();
userLookup[owner].primaryDomain = _tokenId;
emit PrimaryDomainSet(
_tokenId,
owner,
addTLD(registryLookup[_tokenId].domainName)
);
}
function burnDomain(uint256 _tokenId) external nonReentrant whenNotPaused {
address owner = registryLookup[_tokenId].owner;
if (owner != msg.sender) revert NotOwner();
uint256[] memory ownedDomains = userLookup[owner].allOwnedDomains;
uint256[] memory newOwnedDomains = new uint256[](
ownedDomains.length - 1
);
uint256 counter = 0;
for (uint256 i = 0; i < ownedDomains.length; i++) {
if (ownedDomains[i] != _tokenId) {
newOwnedDomains[counter] = ownedDomains[i];
counter++;
}
}
userLookup[owner].allOwnedDomains = newOwnedDomains;
if (
newOwnedDomains.length > 0 &&
userLookup[owner].primaryDomain == _tokenId
) {
userLookup[owner].primaryDomain = newOwnedDomains[0];
emit PrimaryDomainSet(
newOwnedDomains[0],
owner,
addTLD(registryLookup[newOwnedDomains[0]].domainName)
);
} else {
userLookup[owner].primaryDomain = 0;
emit PrimaryDomainSet(0, owner, "");
}
delete registryLookup[_tokenId];
_burn(_tokenId);
clearDomain(_tokenId);
}
/*//////////////////////////////////////////////////////////////
INTERNAL FUNCTIONS
//////////////////////////////////////////////////////////////*/
function addTLD(
string memory domainName
) internal view returns (string memory) {
return string.concat(domainName, string.concat(".", tld));
}
function getValueFromCredits(
uint256 credits
) internal view returns (uint256) {
uint256 currentUSDPrice = getOraclePrice();
return (credits * 1e18) / currentUSDPrice;
}
function isValidDomainName(
string memory domainName
) internal pure returns (bool) {
bytes memory domainBytes = bytes(domainName);
for (uint i = 0; i < domainBytes.length; i++) {
// Check for lowercase letters, numbers, and the "-" character
if (
!(domainBytes[i] >= 0x30 && domainBytes[i] <= 0x39) && // 0-9
!(domainBytes[i] >= 0x61 && domainBytes[i] <= 0x7A) && // a-z
!(domainBytes[i] == 0x2D) && // "-" character
!(domainBytes[i] > 0x7F) // Allow non-ASCII characters (basic check for emojis and other languages)
) {
// If the character is not a lowercase letter, number, "-", or > 0x7F (basic non-ASCII),
// then it's invalid based on our criteria.
return false;
}
}
// Passed all checks
return true;
}
function createTokenURI(
uint256 _tokenId
) internal view returns (string memory) {
string memory tokenId = _tokenId.toString();
uint256 id;
assembly {
id := chainid()
}
string memory tokenUri = string(
abi.encodePacked(baseUri, "/", id.toString(), "/", tokenId)
);
return tokenUri;
}
function strlen(string memory s) internal pure returns (uint256) {
uint256 len;
uint256 i = 0;
uint256 bytelength = bytes(s).length;
for (len = 0; i < bytelength; len++) {
bytes1 b = bytes(s)[i];
if (b < 0x80) {
i += 1;
} else if (b < 0xE0) {
i += 2;
} else if (b < 0xF0) {
i += 3;
} else if (b < 0xF8) {
i += 4;
} else if (b < 0xFC) {
i += 5;
} else {
i += 6;
}
}
return len;
}
function isInvalidAddress(address _address) internal view returns (bool) {
return _address == address(this) || _address == address(0);
}
function isValidLength(uint16 len) internal pure returns (bool) {
return len > 0 && len <= 24;
}
function getReferralBand(address referral) public view returns (uint256) {
if (partnerReferrals[referral] != 0) {
return partnerReferrals[referral];
}
uint256 numberOfReferrals = userLookup[referral].numberOfReferrals;
if (numberOfReferrals >= 0 && numberOfReferrals < 10)
return referTicks[0];
else if (numberOfReferrals >= 10 && numberOfReferrals < 30)
return referTicks[1];
else if (numberOfReferrals >= 30 && numberOfReferrals < 60)
return referTicks[2];
else if (numberOfReferrals >= 60 && numberOfReferrals < 100)
return referTicks[3];
else if (numberOfReferrals >= 100) return referTicks[4];
else revert RefferalEarningCannotBeCalculated();
}
function calculateActualFromBIPS(
uint256 price,
uint256 bips
) public pure returns (uint256) {
return (price * bips) / 10000;
}
function mintDomains(
address[] memory owners,
string[] memory domainNames,
uint16[] memory lengthsOfDomains,
uint256[] memory expiries
) internal whenNotPaused {
if (
domainNames.length != owners.length ||
owners.length != expiries.length ||
lengthsOfDomains.length != owners.length
) {
revert LengthsDoNotMatch();
}
uint256[] memory newTokenIds = new uint256[](domainNames.length);
for (uint256 i = 0; i < domainNames.length; i++) {
address owner = owners[i];
string memory domainName = domainNames[i];
uint256 expiry = expiries[i];
uint16 lengthOfDomain = lengthsOfDomains[i];
uint256 newRecordId = tokenID;
newTokenIds[i] = newRecordId;
if (isInvalidAddress(owners[i])) revert InvalidAddress();
if (
checkDomainStatus(domainLookup[domainName]) ==
domainStatus.REGISTERED
) revert AlreadyRegistered();
if (
checkDomainStatus(domainLookup[domainName]) ==
domainStatus.EXPIRED
) revert DomainExpiredButNotBurned();
unchecked {
tokenID++;
}
registryLookup[newRecordId] = RegistryData({
owner: owner,
domainName: domainName,
lengthOfDomain: lengthOfDomain,
expirationDate: block.timestamp + (365 days * expiry)
});
userLookup[owner].allOwnedDomains.push(newRecordId);
domainLookup[domainName] = newRecordId;
if (userLookup[owner].primaryDomain == 0) {
userLookup[owner].primaryDomain = newRecordId;
emit PrimaryDomainSet(newRecordId, owner, addTLD(domainName));
}
_safeMint(owner, newRecordId);
_setTokenURI(newRecordId, createTokenURI(newRecordId));
totalRegisteredDomains.push(newRecordId);
idToDomain[newRecordId] = domainName;
mintToExpire[newRecordId] = expiry;
emit MintedDomain(
addTLD(domainName),
newRecordId,
owner,
registryLookup[newRecordId].expirationDate
);
}
}
function _beforeTokenTransfer(
address from,
address to,
uint256 firstTokenId,
uint256 batchSize
) internal virtual override {
super._beforeTokenTransfer(from, to, firstTokenId, batchSize);
if (from != address(0) && to != address(0)) {
if (checkDomainStatus(firstTokenId) == domainStatus.EXPIRED)
revert DomainExpired();
uint256[] memory ownedDomains = userLookup[from].allOwnedDomains;
uint256[] memory newOwnedDomains = new uint256[](
ownedDomains.length - batchSize
);
uint256 counter = 0;
for (uint256 i = 0; i < ownedDomains.length; i++) {
if (ownedDomains[i] != firstTokenId) {
newOwnedDomains[counter] = ownedDomains[i];
counter++;
}
}
userLookup[from].allOwnedDomains = newOwnedDomains;
if (
newOwnedDomains.length > 0 &&
userLookup[from].primaryDomain == firstTokenId
) {
userLookup[from].primaryDomain = newOwnedDomains[0];
emit PrimaryDomainSet(
newOwnedDomains[0],
from,
addTLD(registryLookup[newOwnedDomains[0]].domainName)
);
} else {
userLookup[from].primaryDomain = 0;
emit PrimaryDomainSet(0, from, "");
}
userLookup[to].allOwnedDomains.push(firstTokenId);
if (userLookup[to].primaryDomain == 0) {
userLookup[to].primaryDomain = firstTokenId;
emit PrimaryDomainSet(
firstTokenId,
to,
addTLD(registryLookup[firstTokenId].domainName)
);
}
registryLookup[firstTokenId].owner = to;
}
emit TransferredDomain(
addTLD(registryLookup[firstTokenId].domainName),
firstTokenId,
from,
to
);
}
function maintainerBurn(uint256 tokenId) internal {
if (tokenId == 0) revert NotRegistered();
address owner = registryLookup[tokenId].owner;
uint256[] memory ownedDomains = userLookup[owner].allOwnedDomains;
uint256[] memory newOwnedDomains = new uint256[](
ownedDomains.length - 1
);
uint256 counter = 0;
for (uint256 i = 0; i < ownedDomains.length; i++) {
if (ownedDomains[i] != tokenId) {
newOwnedDomains[counter] = ownedDomains[i];
counter++;
}
}
userLookup[owner].allOwnedDomains = newOwnedDomains;
if (
newOwnedDomains.length > 0 &&
userLookup[owner].primaryDomain == tokenId
) {
userLookup[owner].primaryDomain = newOwnedDomains[0];
emit PrimaryDomainSet(
newOwnedDomains[0],
owner,
addTLD(registryLookup[newOwnedDomains[0]].domainName)
);
} else {
userLookup[owner].primaryDomain = 0;
emit PrimaryDomainSet(0, owner, "");
}
delete registryLookup[tokenId];
_burn(tokenId);
clearDomain(tokenId);
}
function clearDomain(uint256 _tokenId) internal {
idToDomain[_tokenId] = "";
for (uint256 i = 0; i < totalRegisteredDomains.length; i++) {
if (totalRegisteredDomains[i] == _tokenId) {
totalRegisteredDomains[i] = totalRegisteredDomains[
totalRegisteredDomains.length - 1
];
totalRegisteredDomains.pop();
}
}
}
/*//////////////////////////////////////////////////////////////
DEPENDANCY FUNCTIONS
//////////////////////////////////////////////////////////////*/
function supportsInterface(
bytes4 interfaceId
)
public
view
virtual
override(ERC721URIStorage, AccessControl)
returns (bool)
{
return super.supportsInterface(interfaceId);
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)
pragma solidity ^0.8.0;
import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";
/**
* @dev Contract module that allows children to implement role-based access
* control mechanisms. This is a lightweight version that doesn't allow enumerating role
* members except through off-chain means by accessing the contract event logs. Some
* applications may benefit from on-chain enumerability, for those cases see
* {AccessControlEnumerable}.
*
* Roles are referred to by their `bytes32` identifier. These should be exposed
* in the external API and be unique. The best way to achieve this is by
* using `public constant` hash digests:
*
* ```solidity
* bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
* ```
*
* Roles can be used to represent a set of permissions. To restrict access to a
* function call, use {hasRole}:
*
* ```solidity
* function foo() public {
* require(hasRole(MY_ROLE, msg.sender));
* ...
* }
* ```
*
* Roles can be granted and revoked dynamically via the {grantRole} and
* {revokeRole} functions. Each role has an associated admin role, and only
* accounts that have a role's admin role can call {grantRole} and {revokeRole}.
*
* By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
* that only accounts with this role will be able to grant or revoke other
* roles. More complex role relationships can be created by using
* {_setRoleAdmin}.
*
* WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
* grant and revoke this role. Extra precautions should be taken to secure
* accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
* to enforce additional security measures for this role.
*/
abstract contract AccessControl is Context, IAccessControl, ERC165 {
struct RoleData {
mapping(address => bool) members;
bytes32 adminRole;
}
mapping(bytes32 => RoleData) private _roles;
bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
/**
* @dev Modifier that checks that an account has a specific role. Reverts
* with a standardized message including the required role.
*
* The format of the revert reason is given by the following regular expression:
*
* /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
*
* _Available since v4.1._
*/
modifier onlyRole(bytes32 role) {
_checkRole(role);
_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
}
/**
* @dev Returns `true` if `account` has been granted `role`.
*/
function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
return _roles[role].members[account];
}
/**
* @dev Revert with a standard message if `_msgSender()` is missing `role`.
* Overriding this function changes the behavior of the {onlyRole} modifier.
*
* Format of the revert message is described in {_checkRole}.
*
* _Available since v4.6._
*/
function _checkRole(bytes32 role) internal view virtual {
_checkRole(role, _msgSender());
}
/**
* @dev Revert with a standard message if `account` is missing `role`.
*
* The format of the revert reason is given by the following regular expression:
*
* /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
*/
function _checkRole(bytes32 role, address account) internal view virtual {
if (!hasRole(role, account)) {
revert(
string(
abi.encodePacked(
"AccessControl: account ",
Strings.toHexString(account),
" is missing role ",
Strings.toHexString(uint256(role), 32)
)
)
);
}
}
/**
* @dev Returns the admin role that controls `role`. See {grantRole} and
* {revokeRole}.
*
* To change a role's admin, use {_setRoleAdmin}.
*/
function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
return _roles[role].adminRole;
}
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*
* May emit a {RoleGranted} event.
*/
function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
_grantRole(role, account);
}
/**
* @dev Revokes `role` from `account`.
*
* If `account` had been granted `role`, emits a {RoleRevoked} event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*
* May emit a {RoleRevoked} event.
*/
function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
_revokeRole(role, account);
}
/**
* @dev Revokes `role` from the calling account.
*
* Roles are often managed via {grantRole} and {revokeRole}: this function's
* purpose is to provide a mechanism for accounts to lose their privileges
* if they are compromised (such as when a trusted device is misplaced).
*
* If the calling account had been revoked `role`, emits a {RoleRevoked}
* event.
*
* Requirements:
*
* - the caller must be `account`.
*
* May emit a {RoleRevoked} event.
*/
function renounceRole(bytes32 role, address account) public virtual override {
require(account == _msgSender(), "AccessControl: can only renounce roles for self");
_revokeRole(role, account);
}
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event. Note that unlike {grantRole}, this function doesn't perform any
* checks on the calling account.
*
* May emit a {RoleGranted} event.
*
* [WARNING]
* ====
* This function should only be called from the constructor when setting
* up the initial roles for the system.
*
* Using this function in any other way is effectively circumventing the admin
* system imposed by {AccessControl}.
* ====
*
* NOTE: This function is deprecated in favor of {_grantRole}.
*/
function _setupRole(bytes32 role, address account) internal virtual {
_grantRole(role, account);
}
/**
* @dev Sets `adminRole` as ``role``'s admin role.
*
* Emits a {RoleAdminChanged} event.
*/
function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
bytes32 previousAdminRole = getRoleAdmin(role);
_roles[role].adminRole = adminRole;
emit RoleAdminChanged(role, previousAdminRole, adminRole);
}
/**
* @dev Grants `role` to `account`.
*
* Internal function without access restriction.
*
* May emit a {RoleGranted} event.
*/
function _grantRole(bytes32 role, address account) internal virtual {
if (!hasRole(role, account)) {
_roles[role].members[account] = true;
emit RoleGranted(role, account, _msgSender());
}
}
/**
* @dev Revokes `role` from `account`.
*
* Internal function without access restriction.
*
* May emit a {RoleRevoked} event.
*/
function _revokeRole(bytes32 role, address account) internal virtual {
if (hasRole(role, account)) {
_roles[role].members[account] = false;
emit RoleRevoked(role, account, _msgSender());
}
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)
pragma solidity ^0.8.0;
/**
* @dev External interface of AccessControl declared to support ERC165 detection.
*/
interface IAccessControl {
/**
* @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
*
* `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
* {RoleAdminChanged} not being emitted signaling this.
*
* _Available since v3.1._
*/
event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
/**
* @dev Emitted when `account` is granted `role`.
*
* `sender` is the account that originated the contract call, an admin role
* bearer except when using {AccessControl-_setupRole}.
*/
event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
/**
* @dev Emitted when `account` is revoked `role`.
*
* `sender` is the account that originated the contract call:
* - if using `revokeRole`, it is the admin role bearer
* - if using `renounceRole`, it is the role bearer (i.e. `account`)
*/
event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
/**
* @dev Returns `true` if `account` has been granted `role`.
*/
function hasRole(bytes32 role, address account) external view returns (bool);
/**
* @dev Returns the admin role that controls `role`. See {grantRole} and
* {revokeRole}.
*
* To change a role's admin, use {AccessControl-_setRoleAdmin}.
*/
function getRoleAdmin(bytes32 role) external view returns (bytes32);
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*/
function grantRole(bytes32 role, address account) external;
/**
* @dev Revokes `role` from `account`.
*
* If `account` had been granted `role`, emits a {RoleRevoked} event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*/
function revokeRole(bytes32 role, address account) external;
/**
* @dev Revokes `role` from the calling account.
*
* Roles are often managed via {grantRole} and {revokeRole}: this function's
* purpose is to provide a mechanism for accounts to lose their privileges
* if they are compromised (such as when a trusted device is misplaced).
*
* If the calling account had been granted `role`, emits a {RoleRevoked}
* event.
*
* Requirements:
*
* - the caller must be `account`.
*/
function renounceRole(bytes32 role, address account) external;
}// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (interfaces/IERC165.sol) pragma solidity ^0.8.0; import "../utils/introspection/IERC165.sol";
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC4906.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
import "./IERC721.sol";
/// @title EIP-721 Metadata Update Extension
interface IERC4906 is IERC165, IERC721 {
/// @dev This event emits when the metadata of a token is changed.
/// So that the third-party platforms such as NFT market could
/// timely update the images and related attributes of the NFT.
event MetadataUpdate(uint256 _tokenId);
/// @dev This event emits when the metadata of a range of tokens is changed.
/// So that the third-party platforms such as NFT market could
/// timely update the images and related attributes of the NFTs.
event BatchMetadataUpdate(uint256 _fromTokenId, uint256 _toTokenId);
}// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (interfaces/IERC721.sol) pragma solidity ^0.8.0; import "../token/ERC721/IERC721.sol";
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which allows children to implement an emergency stop
* mechanism that can be triggered by an authorized account.
*
* This module is used through inheritance. It will make available the
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to
* the functions of your contract. Note that they will not be pausable by
* simply including this module, only once the modifiers are put in place.
*/
abstract contract Pausable is Context {
/**
* @dev Emitted when the pause is triggered by `account`.
*/
event Paused(address account);
/**
* @dev Emitted when the pause is lifted by `account`.
*/
event Unpaused(address account);
bool private _paused;
/**
* @dev Initializes the contract in unpaused state.
*/
constructor() {
_paused = false;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
_requireNotPaused();
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
_requirePaused();
_;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view virtual returns (bool) {
return _paused;
}
/**
* @dev Throws if the contract is paused.
*/
function _requireNotPaused() internal view virtual {
require(!paused(), "Pausable: paused");
}
/**
* @dev Throws if the contract is not paused.
*/
function _requirePaused() internal view virtual {
require(paused(), "Pausable: not paused");
}
/**
* @dev Triggers stopped state.
*
* Requirements:
*
* - The contract must not be paused.
*/
function _pause() internal virtual whenNotPaused {
_paused = true;
emit Paused(_msgSender());
}
/**
* @dev Returns to normal state.
*
* Requirements:
*
* - The contract must be paused.
*/
function _unpause() internal virtual whenPaused {
_paused = false;
emit Unpaused(_msgSender());
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)
pragma solidity ^0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, _status will be _NOT_ENTERED
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
}
function _nonReentrantAfter() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns (bool) {
return _status == _ENTERED;
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/ERC721.sol)
pragma solidity ^0.8.0;
import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";
/**
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
* the Metadata extension, but not including the Enumerable extension, which is available separately as
* {ERC721Enumerable}.
*/
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
using Strings for uint256;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Mapping from token ID to owner address
mapping(uint256 => address) private _owners;
// Mapping owner address to token count
mapping(address => uint256) private _balances;
// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721-balanceOf}.
*/
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), "ERC721: address zero is not a valid owner");
return _balances[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
address owner = _ownerOf(tokenId);
require(owner != address(0), "ERC721: invalid token ID");
return owner;
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
_requireMinted(tokenId);
string memory baseURI = _baseURI();
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
}
/**
* @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
* token will be the concatenation of the `baseURI` and the `tokenId`. Empty
* by default, can be overridden in child contracts.
*/
function _baseURI() internal view virtual returns (string memory) {
return "";
}
/**
* @dev See {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) public virtual override {
address owner = ERC721.ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(
_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not token owner or approved for all"
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual override returns (address) {
_requireMinted(tokenId);
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual override {
_setApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(address from, address to, uint256 tokenId) public virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
_safeTransfer(from, to, tokenId, data);
}
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* `data` is additional data, it has no specified format and it is sent in call to `to`.
*
* This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
}
/**
* @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
*/
function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
return _owners[tokenId];
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted (`_mint`),
* and stop existing when they are burned (`_burn`).
*/
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return _ownerOf(tokenId) != address(0);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
address owner = ERC721.ownerOf(tokenId);
return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
}
/**
* @dev Safely mints `tokenId` and transfers it to `to`.
*
* Requirements:
*
* - `tokenId` must not exist.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeMint(address to, uint256 tokenId) internal virtual {
_safeMint(to, tokenId, "");
}
/**
* @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
* forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
*/
function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {
_mint(to, tokenId);
require(
_checkOnERC721Received(address(0), to, tokenId, data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}
/**
* @dev Mints `tokenId` and transfers it to `to`.
*
* WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
*
* Requirements:
*
* - `tokenId` must not exist.
* - `to` cannot be the zero address.
*
* Emits a {Transfer} event.
*/
function _mint(address to, uint256 tokenId) internal virtual {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_beforeTokenTransfer(address(0), to, tokenId, 1);
// Check that tokenId was not minted by `_beforeTokenTransfer` hook
require(!_exists(tokenId), "ERC721: token already minted");
unchecked {
// Will not overflow unless all 2**256 token ids are minted to the same owner.
// Given that tokens are minted one by one, it is impossible in practice that
// this ever happens. Might change if we allow batch minting.
// The ERC fails to describe this case.
_balances[to] += 1;
}
_owners[tokenId] = to;
emit Transfer(address(0), to, tokenId);
_afterTokenTransfer(address(0), to, tokenId, 1);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
* This is an internal function that does not check if the sender is authorized to operate on the token.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId, 1);
// Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
owner = ERC721.ownerOf(tokenId);
// Clear approvals
delete _tokenApprovals[tokenId];
unchecked {
// Cannot overflow, as that would require more tokens to be burned/transferred
// out than the owner initially received through minting and transferring in.
_balances[owner] -= 1;
}
delete _owners[tokenId];
emit Transfer(owner, address(0), tokenId);
_afterTokenTransfer(owner, address(0), tokenId, 1);
}
/**
* @dev Transfers `tokenId` from `from` to `to`.
* As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
*
* Emits a {Transfer} event.
*/
function _transfer(address from, address to, uint256 tokenId) internal virtual {
require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
require(to != address(0), "ERC721: transfer to the zero address");
_beforeTokenTransfer(from, to, tokenId, 1);
// Check that tokenId was not transferred by `_beforeTokenTransfer` hook
require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
// Clear approvals from the previous owner
delete _tokenApprovals[tokenId];
unchecked {
// `_balances[from]` cannot overflow for the same reason as described in `_burn`:
// `from`'s balance is the number of token held, which is at least one before the current
// transfer.
// `_balances[to]` could overflow in the conditions described in `_mint`. That would require
// all 2**256 token ids to be minted, which in practice is impossible.
_balances[from] -= 1;
_balances[to] += 1;
}
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
_afterTokenTransfer(from, to, tokenId, 1);
}
/**
* @dev Approve `to` to operate on `tokenId`
*
* Emits an {Approval} event.
*/
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
}
/**
* @dev Approve `operator` to operate on all of `owner` tokens
*
* Emits an {ApprovalForAll} event.
*/
function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
require(owner != operator, "ERC721: approve to caller");
_operatorApprovals[owner][operator] = approved;
emit ApprovalForAll(owner, operator, approved);
}
/**
* @dev Reverts if the `tokenId` has not been minted yet.
*/
function _requireMinted(uint256 tokenId) internal view virtual {
require(_exists(tokenId), "ERC721: invalid token ID");
}
/**
* @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
* The call is not executed if the target address is not a contract.
*
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory data
) private returns (bool) {
if (to.isContract()) {
try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
return retval == IERC721Receiver.onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert("ERC721: transfer to non ERC721Receiver implementer");
} else {
/// @solidity memory-safe-assembly
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
/**
* @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
* used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
* - When `from` is zero, the tokens will be minted for `to`.
* - When `to` is zero, ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
* - `batchSize` is non-zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}
/**
* @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
* used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
* - When `from` is zero, the tokens were minted for `to`.
* - When `to` is zero, ``from``'s tokens were burned.
* - `from` and `to` are never both zero.
* - `batchSize` is non-zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}
/**
* @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
*
* WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
* being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
* that `ownerOf(tokenId)` is `a`.
*/
// solhint-disable-next-line func-name-mixedcase
function __unsafe_increaseBalance(address account, uint256 amount) internal {
_balances[account] += amount;
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/extensions/ERC721URIStorage.sol)
pragma solidity ^0.8.0;
import "../ERC721.sol";
import "../../../interfaces/IERC4906.sol";
/**
* @dev ERC721 token with storage based token URI management.
*/
abstract contract ERC721URIStorage is IERC4906, ERC721 {
using Strings for uint256;
// Optional mapping for token URIs
mapping(uint256 => string) private _tokenURIs;
/**
* @dev See {IERC165-supportsInterface}
*/
function supportsInterface(
bytes4 interfaceId
) public view virtual override(ERC721, IERC165) returns (bool) {
return
interfaceId == bytes4(0x49064906) ||
super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(
uint256 tokenId
) public view virtual override returns (string memory) {
_requireMinted(tokenId);
string memory _tokenURI = _tokenURIs[tokenId];
string memory base = _baseURI();
// If there is no base URI, return the token URI.
if (bytes(base).length == 0) {
return _tokenURI;
}
// If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
if (bytes(_tokenURI).length > 0) {
return string(abi.encodePacked(base, _tokenURI));
}
return super.tokenURI(tokenId);
}
/**
* @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
*
* Emits {MetadataUpdate}.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _setTokenURI(
uint256 tokenId,
string memory _tokenURI
) internal virtual {
require(
_exists(tokenId),
"ERC721URIStorage: URI set of nonexistent token"
);
_tokenURIs[tokenId] = _tokenURI;
emit MetadataUpdate(tokenId);
}
/**
* @dev See {ERC721-_burn}. This override additionally checks to see if a
* token-specific URI was set for the token, and if so, it deletes the token URI from
* the storage mapping.
*/
function _burn(uint256 tokenId) internal virtual override {
super._burn(tokenId);
if (bytes(_tokenURIs[tokenId]).length != 0) {
delete _tokenURIs[tokenId];
}
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Metadata is IERC721 {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
* or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
* understand this adds an external call which potentially creates a reentrancy vulnerability.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool approved) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721Receiver {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
*
* Furthermore, `isContract` will also return true if the target contract within
* the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
* which only has an effect at the end of a transaction.
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
* the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if (success) {
if (returndata.length == 0) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require(isContract(target), "Address: call to non-contract");
}
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (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;
}
function _contextSuffixLength() internal view virtual returns (uint256) {
return 0;
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)
pragma solidity ^0.8.0;
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
enum Rounding {
Down, // Toward negative infinity
Up, // Toward infinity
Zero // Toward zero
}
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow.
return (a & b) + (a ^ b) / 2;
}
/**
* @dev Returns the ceiling of the division of two numbers.
*
* This differs from standard division with `/` in that it rounds up instead
* of rounding down.
*/
function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b - 1) / b can overflow on addition, so we distribute.
return a == 0 ? 0 : (a - 1) / b + 1;
}
/**
* @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
* @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
* with further edits by Uniswap Labs also under MIT license.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
unchecked {
// 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
// use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
// variables such that product = prod1 * 2^256 + prod0.
uint256 prod0; // Least significant 256 bits of the product
uint256 prod1; // Most significant 256 bits of the product
assembly {
let mm := mulmod(x, y, not(0))
prod0 := mul(x, y)
prod1 := sub(sub(mm, prod0), lt(mm, prod0))
}
// Handle non-overflow cases, 256 by 256 division.
if (prod1 == 0) {
// Solidity will revert if denominator == 0, unlike the div opcode on its own.
// The surrounding unchecked block does not change this fact.
// See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
return prod0 / denominator;
}
// Make sure the result is less than 2^256. Also prevents denominator == 0.
require(denominator > prod1, "Math: mulDiv overflow");
///////////////////////////////////////////////
// 512 by 256 division.
///////////////////////////////////////////////
// Make division exact by subtracting the remainder from [prod1 prod0].
uint256 remainder;
assembly {
// Compute remainder using mulmod.
remainder := mulmod(x, y, denominator)
// Subtract 256 bit number from 512 bit number.
prod1 := sub(prod1, gt(remainder, prod0))
prod0 := sub(prod0, remainder)
}
// Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
// See https://cs.stackexchange.com/q/138556/92363.
// Does not overflow because the denominator cannot be zero at this stage in the function.
uint256 twos = denominator & (~denominator + 1);
assembly {
// Divide denominator by twos.
denominator := div(denominator, twos)
// Divide [prod1 prod0] by twos.
prod0 := div(prod0, twos)
// Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
twos := add(div(sub(0, twos), twos), 1)
}
// Shift in bits from prod1 into prod0.
prod0 |= prod1 * twos;
// Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
// that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
// four bits. That is, denominator * inv = 1 mod 2^4.
uint256 inverse = (3 * denominator) ^ 2;
// Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
// in modular arithmetic, doubling the correct bits in each step.
inverse *= 2 - denominator * inverse; // inverse mod 2^8
inverse *= 2 - denominator * inverse; // inverse mod 2^16
inverse *= 2 - denominator * inverse; // inverse mod 2^32
inverse *= 2 - denominator * inverse; // inverse mod 2^64
inverse *= 2 - denominator * inverse; // inverse mod 2^128
inverse *= 2 - denominator * inverse; // inverse mod 2^256
// Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
// This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
// less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
// is no longer required.
result = prod0 * inverse;
return result;
}
}
/**
* @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
uint256 result = mulDiv(x, y, denominator);
if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
result += 1;
}
return result;
}
/**
* @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
*
* Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
*/
function sqrt(uint256 a) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
// For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
//
// We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
// `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
//
// This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
// → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
// → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
//
// Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
uint256 result = 1 << (log2(a) >> 1);
// At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
// since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
// every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
// into the expected uint128 result.
unchecked {
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
return min(result, a / result);
}
}
/**
* @notice Calculates sqrt(a), following the selected rounding direction.
*/
function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = sqrt(a);
return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
}
}
/**
* @dev Return the log in base 2, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 128;
}
if (value >> 64 > 0) {
value >>= 64;
result += 64;
}
if (value >> 32 > 0) {
value >>= 32;
result += 32;
}
if (value >> 16 > 0) {
value >>= 16;
result += 16;
}
if (value >> 8 > 0) {
value >>= 8;
result += 8;
}
if (value >> 4 > 0) {
value >>= 4;
result += 4;
}
if (value >> 2 > 0) {
value >>= 2;
result += 2;
}
if (value >> 1 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 2, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log2(value);
return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 10, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >= 10 ** 64) {
value /= 10 ** 64;
result += 64;
}
if (value >= 10 ** 32) {
value /= 10 ** 32;
result += 32;
}
if (value >= 10 ** 16) {
value /= 10 ** 16;
result += 16;
}
if (value >= 10 ** 8) {
value /= 10 ** 8;
result += 8;
}
if (value >= 10 ** 4) {
value /= 10 ** 4;
result += 4;
}
if (value >= 10 ** 2) {
value /= 10 ** 2;
result += 2;
}
if (value >= 10 ** 1) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 10, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log10(value);
return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 256, rounded down, of a positive value.
* Returns 0 if given 0.
*
* Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
*/
function log256(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 16;
}
if (value >> 64 > 0) {
value >>= 64;
result += 8;
}
if (value >> 32 > 0) {
value >>= 32;
result += 4;
}
if (value >> 16 > 0) {
value >>= 16;
result += 2;
}
if (value >> 8 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 256, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log256(value);
return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
}
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)
pragma solidity ^0.8.0;
/**
* @dev Standard signed math utilities missing in the Solidity language.
*/
library SignedMath {
/**
* @dev Returns the largest of two signed numbers.
*/
function max(int256 a, int256 b) internal pure returns (int256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two signed numbers.
*/
function min(int256 a, int256 b) internal pure returns (int256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two signed numbers without overflow.
* The result is rounded towards zero.
*/
function average(int256 a, int256 b) internal pure returns (int256) {
// Formula from the book "Hacker's Delight"
int256 x = (a & b) + ((a ^ b) >> 1);
return x + (int256(uint256(x) >> 255) & (a ^ b));
}
/**
* @dev Returns the absolute unsigned value of a signed value.
*/
function abs(int256 n) internal pure returns (uint256) {
unchecked {
// must be unchecked in order to support `n = type(int256).min`
return uint256(n >= 0 ? n : -n);
}
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)
pragma solidity ^0.8.0;
import "./math/Math.sol";
import "./math/SignedMath.sol";
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _SYMBOLS = "0123456789abcdef";
uint8 private constant _ADDRESS_LENGTH = 20;
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
unchecked {
uint256 length = Math.log10(value) + 1;
string memory buffer = new string(length);
uint256 ptr;
/// @solidity memory-safe-assembly
assembly {
ptr := add(buffer, add(32, length))
}
while (true) {
ptr--;
/// @solidity memory-safe-assembly
assembly {
mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
}
value /= 10;
if (value == 0) break;
}
return buffer;
}
}
/**
* @dev Converts a `int256` to its ASCII `string` decimal representation.
*/
function toString(int256 value) internal pure returns (string memory) {
return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
unchecked {
return toHexString(value, Math.log256(value) + 1);
}
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
/**
* @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
*/
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
}
/**
* @dev Returns true if the two strings are equal.
*/
function equal(string memory a, string memory b) internal pure returns (bool) {
return keccak256(bytes(a)) == keccak256(bytes(b));
}
}// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.21;
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import { ZNSOracle } from "./ZNSOracle.sol";
contract ZNSGiftCard is
ERC721URIStorage,
Pausable,
ReentrancyGuard,
AccessControl
{
/*//////////////////////////////////////////////////////////////
INITIALIZATION
//////////////////////////////////////////////////////////////*/
uint256 public giftTokenID;
mapping(uint256 => uint256) public giftCardBalances;
string public tokenURI;
address public oracle = 0xc11eE6C94A86e18481d9206c29ECDd3B40C59898;
struct UserData {
uint256 credits;
uint256[] ownedGiftCards;
}
mapping(address => UserData) internal userData;
address public treasury = 0xD00c70F9b78C63a36519C488F862DF95b7A73d90;
address public registry;
bytes32 public constant MAINTAINER_ROLE = keccak256("MAINTAINER_ROLE");
constructor(
string memory _tokenURI
) ERC721("ZNS Gift Cards", "ZNSGiftCard") {
tokenURI = _tokenURI;
giftTokenID++;
_grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
_grantRole(MAINTAINER_ROLE, msg.sender);
}
/*//////////////////////////////////////////////////////////////
CUSTOM MODIFIERS
//////////////////////////////////////////////////////////////*/
modifier onlyMaintainer() {
require(
hasRole(MAINTAINER_ROLE, msg.sender),
"maintainer role required"
);
_;
}
modifier onlyAdmin() {
require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "admin role required");
_;
}
/*//////////////////////////////////////////////////////////////
CUSTOM ERRORS
//////////////////////////////////////////////////////////////*/
error InvalidAddress();
error NotEnoughNativeTokenPaid();
error AmountMustBeGreaterThanZero();
error NotOwner();
error NotEnoughCredits();
error LengthsDoNotMatch();
/*//////////////////////////////////////////////////////////////
USER READ FUNCTIONS
//////////////////////////////////////////////////////////////*/
function getUserCredits(address _user) public view returns (uint256) {
return userData[_user].credits;
}
function getUserOwnedGiftCards(
address _user
) public view returns (uint256[] memory) {
return userData[_user].ownedGiftCards;
}
function getOraclePrice() public view returns (uint256) {
return ZNSOracle(oracle).priceToUSD();
}
/*//////////////////////////////////////////////////////////////
USER WRITE FUNCTIONS
//////////////////////////////////////////////////////////////*/
function mintGiftCard(
address _to
) public payable whenNotPaused nonReentrant {
if (msg.value <= 0) revert AmountMustBeGreaterThanZero();
if (isInvalidAddress(_to)) revert InvalidAddress();
uint256 credits = getCreditsFromValue(msg.value);
if (credits <= 0) revert NotEnoughNativeTokenPaid();
giftCardBalances[giftTokenID] = credits;
userData[_to].ownedGiftCards.push(giftTokenID);
_safeMint(_to, giftTokenID);
_setTokenURI(giftTokenID, tokenURI);
payable(treasury).transfer(msg.value);
unchecked {
giftTokenID++;
}
}
function burnGiftCard(uint256 _tokenId) public whenNotPaused nonReentrant {
if (msg.sender != ownerOf(_tokenId)) revert NotOwner();
userData[msg.sender].credits += giftCardBalances[_tokenId];
giftCardBalances[_tokenId] = 0;
uint256[] memory newOwnedCards = new uint256[](
userData[msg.sender].ownedGiftCards.length - 1
);
uint256 counter = 0;
uint256[] memory ownedCards = userData[msg.sender].ownedGiftCards;
for (uint256 i = 0; i < ownedCards.length; i++) {
if (ownedCards[i] != _tokenId) {
newOwnedCards[counter] = ownedCards[i];
counter++;
}
}
userData[msg.sender].ownedGiftCards = newOwnedCards;
_burn(_tokenId);
}
/*//////////////////////////////////////////////////////////////
ADMIN WRITE FUNCTIONS
//////////////////////////////////////////////////////////////*/
function adminMintGiftCards(
address[] memory _to,
uint256[] memory _amountOfCredits
) public onlyAdmin nonReentrant whenNotPaused {
if (_to.length != _amountOfCredits.length) revert LengthsDoNotMatch();
for (uint256 i = 0; i < _to.length; i++) {
if (isInvalidAddress(_to[i])) revert InvalidAddress();
uint newGiftTokenID = giftTokenID;
userData[_to[i]].ownedGiftCards.push(newGiftTokenID);
giftCardBalances[newGiftTokenID] = _amountOfCredits[i];
_safeMint(_to[i], newGiftTokenID);
_setTokenURI(newGiftTokenID, tokenURI);
unchecked {
giftTokenID++;
}
}
}
function setTreasury(
address _treasury
) public onlyAdmin nonReentrant whenNotPaused {
if (isInvalidAddress(_treasury)) revert InvalidAddress();
treasury = _treasury;
}
function adminWithdraw() public onlyAdmin nonReentrant whenNotPaused {
payable(msg.sender).transfer(address(this).balance);
}
function setRegistry(
address _registry
) public onlyAdmin nonReentrant whenNotPaused {
if (isInvalidAddress(_registry)) revert InvalidAddress();
registry = _registry;
_grantRole(MAINTAINER_ROLE, registry);
}
function registryBurnCredits(
address _to,
uint256 _amountOfCredits
) public onlyMaintainer nonReentrant whenNotPaused {
if (_amountOfCredits <= 0) revert AmountMustBeGreaterThanZero();
if (isInvalidAddress(_to)) revert InvalidAddress();
if (userData[_to].credits < _amountOfCredits) revert NotEnoughCredits();
userData[_to].credits -= _amountOfCredits;
}
function setTokenURI(
string memory _tokenURI
) public onlyAdmin whenNotPaused nonReentrant {
tokenURI = _tokenURI;
}
function setOracle(
address _oracleAddress
) public onlyAdmin nonReentrant whenNotPaused {
if (isInvalidAddress(_oracleAddress)) revert InvalidAddress();
oracle = _oracleAddress;
}
/*//////////////////////////////////////////////////////////////
INTERNAL FUNCTIONS
//////////////////////////////////////////////////////////////*/
function isInvalidAddress(address _address) internal view returns (bool) {
return _address == address(this) || _address == address(0);
}
function getCreditsFromValue(
uint256 _value
) internal view returns (uint256) {
uint256 currentUSDPrice = getOraclePrice();
return (_value * currentUSDPrice) / 1e18;
}
/*//////////////////////////////////////////////////////////////
DEPENDANCY FUNCTIONS
//////////////////////////////////////////////////////////////*/
function supportsInterface(
bytes4 interfaceId
)
public
view
virtual
override(ERC721URIStorage, AccessControl)
returns (bool)
{
return super.supportsInterface(interfaceId);
}
}// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.21;
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
contract ZNSOracle is AccessControl, ReentrancyGuard, Pausable {
/*//////////////////////////////////////////////////////////////
INITIALIZATION
//////////////////////////////////////////////////////////////*/
uint256 public priceToUSD = 1e18;
bytes32 public constant MAINTAINER_ROLE = keccak256("MAINTAINER_ROLE");
constructor() {
_grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
_grantRole(MAINTAINER_ROLE, msg.sender);
}
/*//////////////////////////////////////////////////////////////
CUSTOM MODIFIERS
//////////////////////////////////////////////////////////////*/
modifier onlyMaintainer() {
require(
hasRole(MAINTAINER_ROLE, msg.sender),
"maintainer role required"
);
_;
}
modifier onlyAdmin() {
require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "admin role required");
_;
}
/*//////////////////////////////////////////////////////////////
ADMIN WRITE FUNCTIONS
//////////////////////////////////////////////////////////////*/
function setPrice(
uint256 _currentPrice
) public onlyMaintainer nonReentrant whenNotPaused {
priceToUSD = _currentPrice;
}
}{
"optimizer": {
"enabled": true,
"runs": 200
},
"evmVersion": "paris",
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"metadata": {
"useLiteralContent": true
},
"libraries": {}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : _oracle (address): 0xc11eE6C94A86e18481d9206c29ECDd3B40C59898
Arg [1] : _giftCard (address): 0x0246D65bA41Da3DB6dB55e489146eB25ca3634E5
Arg [2] : _symbol (string): .speed
Arg [3] : _tld (string): speed
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000c11ee6c94a86e18481d9206c29ecdd3b40c59898
Arg [1] : 0000000000000000000000000246d65ba41da3db6db55e489146eb25ca3634e5
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [5] : 2e73706565640000000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [7] : 7370656564000000000000000000000000000000000000000000000000000000
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