ERC-721
Overview
Max Total Supply
100 SQUARES
Holders
97
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
1 SQUARESLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Source Code Verified (Exact Match)
Contract Name:
Squares
Compiler Version
v0.8.11+commit.d7f03943
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.11; import "@openzeppelin/contracts/token/ERC721/IERC721.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/utils/math/SafeMath.sol"; import "./AdAuction.sol"; import "./SportsDataAPIConsumer.sol"; import "./RandomGameBoard.sol"; import "./SquaresNFT.sol"; import "./Tag.sol"; /** * @author Atlas Corporation * @title Squares on Chain */ contract Squares is Ownable, SquaresNFT, RandomGameBoard, SportsDataAPIConsumer, AdAuction { using SafeMath for uint256; mapping(uint256 => bool) public quarterPrizeClaimed; uint256 public totalPrizeCollected; constructor() SportsDataAPIConsumer(0x0aefab6f66d0278B99B6eCbFa8a03f9828cD90b0) AdAuction("Atlas Corp",0xe64581F067Cfdce58657E3c0F58175e638C30f2B) { } function getGameBoardRandomness() public override(RandomGameBoard) onlyOwner returns (bytes32) { return super.getGameBoardRandomness(); } function assignGameBoard() public override(RandomGameBoard) onlyOwner { super.assignGameBoard(); } function getGameScores() public override(SportsDataAPIConsumer) onlyOwner { super.getGameScores(); } function getTile(uint256 _homeScore, uint256 _awayScore) public view returns (uint256) { require(gameState == GameState.Set, "Game not set"); require(_homeScore >= 0 && _homeScore <= 9,"Home score must be within the bounds 0 to 9"); require(_awayScore >= 0 && _awayScore <= 9,"Home score must be within the bounds 0 to 9"); if(teamAssignment){ return calculateTileNumber(homeTeamMap[_homeScore], awayTeamMap[_awayScore]); } else{ return calculateTileNumber(awayTeamMap[_awayScore], homeTeamMap[_homeScore]); } } function calculateTileNumber(uint256 _x, uint256 _y) public pure returns (uint256){ require(_x >= 0 && _x <= 9, "X out of bounds"); require(_y >= 0 && _y <= 9, "Y out of bounds"); return _y.mul(10).add(_x).add(1); } function getScorePair(uint256 _tokenId) public view returns (uint256 _homeScore, uint256 _awayScore){ require(gameState == GameState.Set, "Game not set"); require(_tokenId > 0, "TokenID must be greater than 0"); require(_tokenId <= 100, "TokenID must be less than 100"); uint256 x = _tokenId.sub(1).mod(10); uint256 y = _tokenId.sub(1).sub(x).div(10); if(teamAssignment){ return (homeTeam[x],awayTeam[y]); } else{ return (homeTeam[y],awayTeam[x]); } } function startAdSale() public override(AdAuction) onlyOwner { require(gameState != GameState.Complete, "Game is complete. No more ads"); super.startAdSale(); } function stopAdSale() public override(AdAuction) onlyOwner { totalPrizeCollected = address(this).balance; super.stopAdSale(); } function claimPrize(uint256 _quarter) public { require(_quarter >= 1 && _quarter <= 4, "Quarter must be 1 through 4"); require(quarter[_quarter].homeDataState == DataState.Complete, "Home Score Not Set"); require(quarter[_quarter].awayDataState == DataState.Complete, "Away Score Not Set"); require(!quarterPrizeClaimed[_quarter],"Prize already claimed"); require(ownerOf(quarterWinner(_quarter))==msg.sender,"Caller does not own winning tile"); require(!adSaleActive,"Prizes cannot be claimed while Ad Auction is live"); require(totalPrizeCollected!=0,"No prize pool"); require(payable(msg.sender).send(totalPrizeCollected.div(4))); quarterPrizeClaimed[_quarter] = true; } function quarterWinner(uint256 _quarter) public view returns (uint256) { require(_quarter >= 1 && _quarter <= 4, "Quarter must be 1 through 4"); require(quarter[_quarter].homeDataState == DataState.Complete, "Home Score Not Set"); require(quarter[_quarter].awayDataState == DataState.Complete, "Away Score Not Set"); if(_quarter == 4){ return getTile( quarter[5].homeScoreTotal.mod(10), quarter[5].awayScoreTotal.mod(10) ); } else { return getTile( quarter[_quarter].homeScoreTotal.mod(10), quarter[_quarter].awayScoreTotal.mod(10) ); } } function setBaseURI(string memory _URI) public override(SquaresNFT) onlyOwner { super.setBaseURI(_URI); } function startClaim() public override(SquaresNFT) onlyOwner { super.startClaim(); } function withdrawBalance() public onlyOwner { require(quarterPrizeClaimed[1],"Quarter 1 prize not claimed"); require(quarterPrizeClaimed[2],"Quarter 1 prize not claimed"); require(quarterPrizeClaimed[3],"Quarter 1 prize not claimed"); require(quarterPrizeClaimed[4],"Quarter 1 prize not claimed"); require(payable(owner()).send(address(this).balance)); } // To be used in the event of an emergency. Should there be a contract failure, having this // function in place will allow winners to be paid manually. // If this function is called, expect a post mortem from: MorrisMustang.eth, howieDoin.eth function emergencyRug() public onlyOwner { require(payable(owner()).send(address(this).balance)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.10; // ---------------[ ]--------------- // -------[ ]-------------[ ]------- // --------------------------------- // ----[ ]--------[ ]--------[ ]---- // --------------------------------- // -------[ ]-------------[ ]------- // ---------------[ ]---------------
// SPDX-License-Identifier: MIT pragma solidity ^0.8.11; import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; import "@openzeppelin/contracts/utils/math/SafeMath.sol"; import "@openzeppelin/contracts/utils/Counters.sol"; import "@openzeppelin/contracts/utils/Address.sol"; enum ClaimState { Off, Active, SoldOut } contract SquaresNFT is ERC721, ERC721Enumerable { using SafeMath for uint256; using Address for address; using Counters for Counters.Counter; uint256 public constant MAX_TILE_NUMBER = 100; Counters.Counter private tileCounter; ClaimState public claimState; string public baseURI; mapping(uint256 => bool) public tilePurchased; mapping(address => bool) public addressHasPurchased; constructor() ERC721("SQUARES", "SQUARES") { claimState = ClaimState.Off; } function mint(uint256 _tile) external payable { require(claimState == ClaimState.Active, "Sale not active"); require(_tile <= MAX_TILE_NUMBER, "Tile number must be below 100"); require(_tile > 0,"Tile 0 is not valid"); require(!tilePurchased[_tile], "Tile already purchased"); require(!addressHasPurchased[msg.sender], "Caller has already purchased a tile"); require(!msg.sender.isContract(),"Caller cannot be a smart contract"); _safeMint(msg.sender, _tile); tileCounter.increment(); addressHasPurchased[msg.sender] = true; tilePurchased[_tile] = true; if(tileCounter.current()==100){ stopClaim(); } } function startClaim() public virtual{ require(claimState == ClaimState.Off, "Sale already started and/or completed"); claimState = ClaimState.Active; } function stopClaim() private { claimState = ClaimState.SoldOut; } function setBaseURI(string memory _URI) public virtual { baseURI = _URI; } function _baseURI() internal view override(ERC721) returns (string memory) { return baseURI; } // Read only, not to be used in smart contract calls function getTileOwners(uint256 _lower, uint256 _upper) public view returns (address[] memory) { require(_upper < 101, "Upper cannot exceed 100"); require(_lower > 0, "Lower must be greater than zero"); require(_upper > _lower, "Upper must be larger than lower"); address[] memory tileOwners = new address[](100); for(uint256 i = _lower; i <= _upper; i++ ){ if(tilePurchased[i]){ tileOwners[i-1] = ownerOf(i); } else{ tileOwners[i-1] = address(0); } } return tileOwners; } function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal override(ERC721, ERC721Enumerable) { super._beforeTokenTransfer(from, to, tokenId); } function supportsInterface(bytes4 interfaceId) public view override(ERC721, ERC721Enumerable) returns (bool) { return super.supportsInterface(interfaceId); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.11; import "@openzeppelin/contracts/utils/math/SafeMath.sol"; import "@chainlink/contracts/src/v0.8/VRFConsumerBase.sol"; enum GameState { PreReveal, GettingVRF, ReceivedVRF, Set, Complete } contract RandomGameBoard is VRFConsumerBase { using SafeMath for uint256; GameState public gameState; uint256[] internal homeTeam = new uint256[](10); uint256[] internal awayTeam = new uint256[](10); mapping(uint256 => uint256) public homeTeamMap; mapping(uint256 => uint256) public awayTeamMap; bool public teamAssignment; uint256[] public possibleScores = [0,1,2,3,4,5,6,7,8,9]; uint256[] public homeTeamRandomness; uint256[] public awayTeamRandomness; uint256 public teamAssignmentRandomness; bytes32 internal keyHash; uint256 internal VRFfee; bytes32 internal VRFRequestId; constructor() VRFConsumerBase( 0xf0d54349aDdcf704F77AE15b96510dEA15cb7952, // VRF Coordinator 0x514910771AF9Ca656af840dff83E8264EcF986CA // LINK Token ) { gameState = GameState.PreReveal; keyHash = 0xAA77729D3466CA35AE8D28B3BBAC7CC36A5031EFDC430821C02BC31A238AF445; VRFfee = 2 ether; homeTeamRandomness = new uint256[](9); awayTeamRandomness = new uint256[](9); } function getGameBoardRandomness() public virtual returns (bytes32) { require(LINK.balanceOf(address(this)) >= VRFfee, "Not enough LINK - fill contract with faucet"); return requestRandomness(keyHash, VRFfee); } /** * Callback function used by VRF Coordinator */ function fulfillRandomness(bytes32 requestId, uint256 randomness) internal override { require(gameState == GameState.PreReveal,"Game must be in initial state"); gameState = GameState.GettingVRF; assignRandomness(randomness); } function assignRandomness(uint256 _randomness) internal { require(gameState == GameState.GettingVRF,"Game must be in initial state"); gameState = GameState.ReceivedVRF; uint256 nextRandomNumber = uint256(keccak256(abi.encode(_randomness))); for(uint256 i=0; i < 9; i++){ nextRandomNumber = uint256(keccak256(abi.encode(nextRandomNumber))); homeTeamRandomness[i] = nextRandomNumber; } for(uint256 i=0; i < 9; i++){ nextRandomNumber = uint256(keccak256(abi.encode(nextRandomNumber))); awayTeamRandomness[i] = nextRandomNumber; } nextRandomNumber = uint256(keccak256(abi.encode(nextRandomNumber))); teamAssignmentRandomness = nextRandomNumber; } function assignGameBoard() public virtual { require(gameState == GameState.ReceivedVRF, "Game in wrong state"); gameState = GameState.Set; uint256[] memory digits = possibleScores; uint256 randomNumberInRange = 0; for(uint256 i = 0; i < 9; i++){ randomNumberInRange = getRandomNumberInRange(homeTeamRandomness[i],0+i,9); digits = swapArrayElement(digits,i,randomNumberInRange); homeTeamMap[digits[i]] = i; } homeTeam = digits; digits = possibleScores; for(uint256 i = 0; i < 9; i++){ randomNumberInRange = getRandomNumberInRange(awayTeamRandomness[i],0+i,9); digits = swapArrayElement(digits,i,randomNumberInRange); awayTeamMap[digits[i]] = i; } awayTeam = digits; randomNumberInRange = getRandomNumberInRange(teamAssignmentRandomness, 0, 1); if(randomNumberInRange == 0){ teamAssignment = false; } else{ teamAssignment = true; } } function swapArrayElement(uint256[] memory initialArray, uint256 firstElement, uint256 secondElement) public pure returns (uint256[] memory){ uint256 temp = initialArray[firstElement]; initialArray[firstElement] = initialArray[secondElement]; initialArray[secondElement] = temp; return initialArray; } function getRandomNumberInRange(uint256 randomness, uint256 lowerBound, uint256 upperBound) public pure returns (uint256){ return randomness.mod(upperBound.sub(lowerBound).add(1)).add(lowerBound); } function getHomeTeamArray() public view returns (uint256[] memory){ uint256[] memory homeTeamArray = new uint256[](10); for(uint256 i = 0; i < 10; i++){ homeTeamArray[i] = homeTeam[i]; } return homeTeamArray; } function getAwayTeamArray() public view returns (uint256[] memory){ uint256[] memory awayTeamArray = new uint256[](10); for(uint256 i = 0; i < 10; i++){ awayTeamArray[i] = awayTeam[i]; } return awayTeamArray; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.11; import "@chainlink/contracts/src/v0.8/ChainlinkClient.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; enum DataState { Waiting, Getting, SetRaw, Complete } struct Quarter { uint256 homeScoreQuarter; uint256 awayScoreQuarter; uint256 homeScoreTotal; uint256 awayScoreTotal; DataState homeDataState; DataState awayDataState; string homePath; string awayPath; } contract SportsDataAPIConsumer is ChainlinkClient { using Chainlink for Chainlink.Request; struct JobSpec { uint256 quarter; // 1 - home, 2 - away uint256 team; } mapping(uint256 => Quarter) public quarter; mapping(bytes32 => JobSpec) public jobSpecs; bytes32 private jobId; uint256 public dataFee; DataState public gameScoreDataState; event ScoresReceived(uint256 _quarter, uint256 _team, uint256 _score); /** * Network: Mainnet * Oracle: 0x0aefab6f66d0278B99B6eCbFa8a03f9828cD90b0 (Atlas Chainlink Node) * Job ID: 47a7f197fec844fc8c1fe259441bd3dc * Fee: 2 LINK */ constructor(address _oracleAddress){ setPublicChainlinkToken(); setChainlinkOracle(_oracleAddress); // Mainnet jobId = "47a7f197fec844fc8c1fe259441bd3dc"; dataFee = 2 ether; gameScoreDataState = DataState.Waiting; quarter[1].homePath = "0,HomeScoreQuarter1"; quarter[1].awayPath = "0,AwayScoreQuarter1"; quarter[2].homePath = "0,HomeScoreQuarter2"; quarter[2].awayPath = "0,AwayScoreQuarter2"; quarter[3].homePath = "0,HomeScoreQuarter3"; quarter[3].awayPath = "0,AwayScoreQuarter3"; quarter[4].homePath = "0,HomeScoreQuarter4"; quarter[4].awayPath = "0,AwayScoreQuarter4"; quarter[5].homePath = "0,HomeScoreOvertime"; quarter[5].awayPath = "0,AwayScoreOvertime"; } function getGameScores() public virtual { for(uint256 i = 1; i <= 5; i++){ requestQuarterScoreData(i); } } function requestQuarterScoreData(uint256 _quarter) internal { require(_quarter > 0, "Quarter must be greater than 0"); require(_quarter <= 5, "Quarter must be less than or equal to 5, includes overtime"); require(quarter[_quarter].homeDataState == DataState.Waiting, "Quarter score lookup already initiated"); require(quarter[_quarter].awayDataState == DataState.Waiting, "Quarter score lookup already initiated"); jobSpecs[requestScoreData(quarter[_quarter].homePath)] = JobSpec({quarter: _quarter, team: 1}); jobSpecs[requestScoreData(quarter[_quarter].awayPath)] = JobSpec({quarter: _quarter, team: 2}); quarter[_quarter].homeDataState = DataState.Getting; quarter[_quarter].awayDataState = DataState.Getting; } function requestScoreData(string memory _dataPath) private returns (bytes32 requestId) { require(IERC20(chainlinkTokenAddress()).balanceOf(address(this)) >= dataFee, "Not enough LINK - fill contract with faucet"); Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfill.selector); request.add("path", _dataPath); return sendChainlinkRequest(request, dataFee); } /** * Receive the response in the form of uint256 */ function fulfill(bytes32 _requestId, uint256 _score) public recordChainlinkFulfillment(_requestId) { // home team score if(jobSpecs[_requestId].team==1){ quarter[jobSpecs[_requestId].quarter].homeScoreQuarter = _score; quarter[jobSpecs[_requestId].quarter].homeDataState = DataState.SetRaw; emit ScoresReceived(jobSpecs[_requestId].quarter, 1, _score); } else if (jobSpecs[_requestId].team==2){ quarter[jobSpecs[_requestId].quarter].awayScoreQuarter = _score; quarter[jobSpecs[_requestId].quarter].awayDataState = DataState.SetRaw; emit ScoresReceived(jobSpecs[_requestId].quarter, 2, _score); } if(allQuartersScoresReturned()){ sumQuarterScores(); gameScoreDataState = DataState.Complete; } } function sumQuarterScores() private { quarter[1].homeScoreTotal = quarter[1].homeScoreQuarter; quarter[1].homeDataState = DataState.Complete; quarter[1].awayScoreTotal = quarter[1].awayScoreQuarter; quarter[1].awayDataState = DataState.Complete; for(uint256 i = 2; i <= 5; i++ ){ quarter[i].homeScoreTotal = quarter[i].homeScoreQuarter + quarter[i-1].homeScoreTotal; quarter[i].homeDataState = DataState.Complete; quarter[i].awayScoreTotal = quarter[i].awayScoreQuarter + quarter[i-1].awayScoreTotal; quarter[i].awayDataState = DataState.Complete; } } function allQuartersScoresReturned() private view returns (bool){ for(uint256 i = 1; i <= 5; i++){ if ( quarter[i].homeDataState != DataState.SetRaw || quarter[i].awayDataState != DataState.SetRaw ) { return false; } } return true; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.11; import "@openzeppelin/contracts/utils/Counters.sol"; import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol"; contract AdAuction { using Counters for Counters.Counter; using EnumerableSet for EnumerableSet.AddressSet; bool public adSaleActive; string public diamondSponsorAd; address public diamondSponsor; uint256 public lastAmountPaid; uint256 public diamondSponsorshipBlockNumber; uint256 public minimumAirtimeInBlocks; Counters.Counter private diamondSponsorshipCounter; EnumerableSet.AddressSet private platinumSponsors; uint256 public platinumSponsorshipRate; EnumerableSet.AddressSet private goldSponsors; uint256 public goldSponsorshipRate; EnumerableSet.AddressSet private silverSponsors; uint256 public silverSponsorshipRate; event DiamondSponsorReplaced(address _address, uint256 _amount); event PlatinumSponsorAdded(address _address); event GoldSponsorAdded(address _address); event SilverSponsorAdded(address _address); constructor(string memory _initialDiamondSponsorAd, address _initialDiamondSponsor){ diamondSponsorAd = _initialDiamondSponsorAd; diamondSponsor = _initialDiamondSponsor; lastAmountPaid = 0; minimumAirtimeInBlocks = 20; platinumSponsorshipRate = 0.25 ether; goldSponsorshipRate = 0.1 ether; silverSponsorshipRate = 0.05 ether; } function diamondSponsorship(string calldata _ad) public payable { require(bytes(_ad).length<=32,"Ad cannot be greater than 32 characters"); require(msg.value > lastAmountPaid, "Caller must pay more than previous Advertiser"); require(block.timestamp >= diamondSponsorshipBlockNumber + minimumAirtimeInBlocks,"Must wait at leaast 10 blocks between ads"); require(adSaleActive,"Ad sale not active"); diamondSponsorAd = _ad; diamondSponsor = msg.sender; diamondSponsorshipBlockNumber = block.timestamp; lastAmountPaid = msg.value; diamondSponsorshipCounter.increment(); emit DiamondSponsorReplaced(msg.sender, msg.value); } function platinumSponsorship() public payable { require(msg.value >= platinumSponsorshipRate, "Caller must send correct amount"); require(platinumSponsors.add(msg.sender),"Caller already a Platinum Sponsor"); require(adSaleActive,"Ad sale not active"); emit PlatinumSponsorAdded(msg.sender); } function goldSponsorship() public payable { require(msg.value >= goldSponsorshipRate, "Caller must send correct amount"); require(goldSponsors.add(msg.sender),"Caller already a Gold Sponsor"); require(adSaleActive,"Ad sale not active"); emit GoldSponsorAdded(msg.sender); } function silverSponsorship() public payable { require(msg.value >= silverSponsorshipRate, "Caller must send correct amount"); require(silverSponsors.add(msg.sender),"Caller already a Silver Sponsor"); require(adSaleActive,"Ad sale not active"); emit SilverSponsorAdded(msg.sender); } function startAdSale() public virtual { require(!adSaleActive, "Ad sale already active"); adSaleActive = true; } function stopAdSale() public virtual { require(adSaleActive, "Ad sale off"); adSaleActive = false; } function getPlatinumSponsors() public view returns (address[] memory){ return platinumSponsors.values(); } function getGoldSponsors() public view returns (address[] memory){ return goldSponsors.values(); } function getSilverSponsors() public view returns (address[] memory){ return silverSponsors.values(); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/math/SafeMath.sol) pragma solidity ^0.8.0; // CAUTION // This version of SafeMath should only be used with Solidity 0.8 or later, // because it relies on the compiler's built in overflow checks. /** * @dev Wrappers over Solidity's arithmetic operations. * * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler * now has built in overflow checking. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b > a) return (false, 0); return (true, a - b); } } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a / b); } } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a % b); } } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { return a + b; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { return a * b; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b <= a, errorMessage); return a - b; } } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a / b; } } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a % b; } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (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`, 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 be 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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * * 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 Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @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 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); /** * @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; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (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 * ==== * * [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://diligence.consensys.net/posts/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/v0.5.11/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 functionCall(target, data, "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"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(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) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(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) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason 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 { // 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 assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Counters.sol) pragma solidity ^0.8.0; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` */ library Counters { struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { unchecked { counter._value += 1; } } function decrement(Counter storage counter) internal { uint256 value = counter._value; require(value > 0, "Counter: decrement overflow"); unchecked { counter._value = value - 1; } } function reset(Counter storage counter) internal { counter._value = 0; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol) pragma solidity ^0.8.0; import "../ERC721.sol"; import "./IERC721Enumerable.sol"; /** * @dev This implements an optional extension of {ERC721} defined in the EIP that adds * enumerability of all the token ids in the contract as well as all token ids owned by each * account. */ abstract contract ERC721Enumerable is ERC721, IERC721Enumerable { // Mapping from owner to list of owned token IDs mapping(address => mapping(uint256 => uint256)) private _ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) private _ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] private _allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) private _allTokensIndex; /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) { return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}. */ function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) { require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds"); return _ownedTokens[owner][index]; } /** * @dev See {IERC721Enumerable-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _allTokens.length; } /** * @dev See {IERC721Enumerable-tokenByIndex}. */ function tokenByIndex(uint256 index) public view virtual override returns (uint256) { require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds"); return _allTokens[index]; } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` cannot be the zero address. * - `to` cannot be the zero address. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual override { super._beforeTokenTransfer(from, to, tokenId); if (from == address(0)) { _addTokenToAllTokensEnumeration(tokenId); } else if (from != to) { _removeTokenFromOwnerEnumeration(from, tokenId); } if (to == address(0)) { _removeTokenFromAllTokensEnumeration(tokenId); } else if (to != from) { _addTokenToOwnerEnumeration(to, tokenId); } } /** * @dev Private function to add a token to this extension's ownership-tracking data structures. * @param to address representing the new owner of the given token ID * @param tokenId uint256 ID of the token to be added to the tokens list of the given address */ function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { uint256 length = ERC721.balanceOf(to); _ownedTokens[to][length] = tokenId; _ownedTokensIndex[tokenId] = length; } /** * @dev Private function to add a token to this extension's token tracking data structures. * @param tokenId uint256 ID of the token to be added to the tokens list */ function _addTokenToAllTokensEnumeration(uint256 tokenId) private { _allTokensIndex[tokenId] = _allTokens.length; _allTokens.push(tokenId); } /** * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for * gas optimizations e.g. when performing a transfer operation (avoiding double writes). * This has O(1) time complexity, but alters the order of the _ownedTokens array. * @param from address representing the previous owner of the given token ID * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private { // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = ERC721.balanceOf(from) - 1; uint256 tokenIndex = _ownedTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary if (tokenIndex != lastTokenIndex) { uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index } // This also deletes the contents at the last position of the array delete _ownedTokensIndex[tokenId]; delete _ownedTokens[from][lastTokenIndex]; } /** * @dev Private function to remove a token from this extension's token tracking data structures. * This has O(1) time complexity, but alters the order of the _allTokens array. * @param tokenId uint256 ID of the token to be removed from the tokens list */ function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = _allTokens.length - 1; uint256 tokenIndex = _allTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding // an 'if' statement (like in _removeTokenFromOwnerEnumeration) uint256 lastTokenId = _allTokens[lastTokenIndex]; _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index // This also deletes the contents at the last position of the array delete _allTokensIndex[tokenId]; _allTokens.pop(); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (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: balance query for the zero address"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _owners[tokenId]; require(owner != address(0), "ERC721: owner query for nonexistent token"); 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) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); 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 overriden 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 owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); 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: transfer caller is not owner nor 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: transfer caller is not owner nor 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 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 _owners[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) { require(_exists(tokenId), "ERC721: operator query for nonexistent token"); address owner = ERC721.ownerOf(tokenId); return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, 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); _balances[to] += 1; _owners[tokenId] = to; emit Transfer(address(0), to, tokenId); _afterTokenTransfer(address(0), to, tokenId); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId); // Clear approvals _approve(address(0), tokenId); _balances[owner] -= 1; delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); _afterTokenTransfer(owner, address(0), tokenId); } /** * @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); // Clear approvals from the previous owner _approve(address(0), tokenId); _balances[from] -= 1; _balances[to] += 1; _owners[tokenId] = to; emit Transfer(from, to, tokenId); _afterTokenTransfer(from, to, tokenId); } /** * @dev Approve `to` to operate on `tokenId` * * Emits a {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 a {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 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 { assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 tokenId ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./Chainlink.sol"; import "./interfaces/ENSInterface.sol"; import "./interfaces/LinkTokenInterface.sol"; import "./interfaces/ChainlinkRequestInterface.sol"; import "./interfaces/OperatorInterface.sol"; import "./interfaces/PointerInterface.sol"; import {ENSResolver as ENSResolver_Chainlink} from "./vendor/ENSResolver.sol"; /** * @title The ChainlinkClient contract * @notice Contract writers can inherit this contract in order to create requests for the * Chainlink network */ abstract contract ChainlinkClient { using Chainlink for Chainlink.Request; uint256 internal constant LINK_DIVISIBILITY = 10**18; uint256 private constant AMOUNT_OVERRIDE = 0; address private constant SENDER_OVERRIDE = address(0); uint256 private constant ORACLE_ARGS_VERSION = 1; uint256 private constant OPERATOR_ARGS_VERSION = 2; bytes32 private constant ENS_TOKEN_SUBNAME = keccak256("link"); bytes32 private constant ENS_ORACLE_SUBNAME = keccak256("oracle"); address private constant LINK_TOKEN_POINTER = 0xC89bD4E1632D3A43CB03AAAd5262cbe4038Bc571; ENSInterface private s_ens; bytes32 private s_ensNode; LinkTokenInterface private s_link; OperatorInterface private s_oracle; uint256 private s_requestCount = 1; mapping(bytes32 => address) private s_pendingRequests; event ChainlinkRequested(bytes32 indexed id); event ChainlinkFulfilled(bytes32 indexed id); event ChainlinkCancelled(bytes32 indexed id); /** * @notice Creates a request that can hold additional parameters * @param specId The Job Specification ID that the request will be created for * @param callbackAddr address to operate the callback on * @param callbackFunctionSignature function signature to use for the callback * @return A Chainlink Request struct in memory */ function buildChainlinkRequest( bytes32 specId, address callbackAddr, bytes4 callbackFunctionSignature ) internal pure returns (Chainlink.Request memory) { Chainlink.Request memory req; return req.initialize(specId, callbackAddr, callbackFunctionSignature); } /** * @notice Creates a request that can hold additional parameters * @param specId The Job Specification ID that the request will be created for * @param callbackFunctionSignature function signature to use for the callback * @return A Chainlink Request struct in memory */ function buildOperatorRequest(bytes32 specId, bytes4 callbackFunctionSignature) internal view returns (Chainlink.Request memory) { Chainlink.Request memory req; return req.initialize(specId, address(this), callbackFunctionSignature); } /** * @notice Creates a Chainlink request to the stored oracle address * @dev Calls `chainlinkRequestTo` with the stored oracle address * @param req The initialized Chainlink Request * @param payment The amount of LINK to send for the request * @return requestId The request ID */ function sendChainlinkRequest(Chainlink.Request memory req, uint256 payment) internal returns (bytes32) { return sendChainlinkRequestTo(address(s_oracle), req, payment); } /** * @notice Creates a Chainlink request to the specified oracle address * @dev Generates and stores a request ID, increments the local nonce, and uses `transferAndCall` to * send LINK which creates a request on the target oracle contract. * Emits ChainlinkRequested event. * @param oracleAddress The address of the oracle for the request * @param req The initialized Chainlink Request * @param payment The amount of LINK to send for the request * @return requestId The request ID */ function sendChainlinkRequestTo( address oracleAddress, Chainlink.Request memory req, uint256 payment ) internal returns (bytes32 requestId) { uint256 nonce = s_requestCount; s_requestCount = nonce + 1; bytes memory encodedRequest = abi.encodeWithSelector( ChainlinkRequestInterface.oracleRequest.selector, SENDER_OVERRIDE, // Sender value - overridden by onTokenTransfer by the requesting contract's address AMOUNT_OVERRIDE, // Amount value - overridden by onTokenTransfer by the actual amount of LINK sent req.id, address(this), req.callbackFunctionId, nonce, ORACLE_ARGS_VERSION, req.buf.buf ); return _rawRequest(oracleAddress, nonce, payment, encodedRequest); } /** * @notice Creates a Chainlink request to the stored oracle address * @dev This function supports multi-word response * @dev Calls `sendOperatorRequestTo` with the stored oracle address * @param req The initialized Chainlink Request * @param payment The amount of LINK to send for the request * @return requestId The request ID */ function sendOperatorRequest(Chainlink.Request memory req, uint256 payment) internal returns (bytes32) { return sendOperatorRequestTo(address(s_oracle), req, payment); } /** * @notice Creates a Chainlink request to the specified oracle address * @dev This function supports multi-word response * @dev Generates and stores a request ID, increments the local nonce, and uses `transferAndCall` to * send LINK which creates a request on the target oracle contract. * Emits ChainlinkRequested event. * @param oracleAddress The address of the oracle for the request * @param req The initialized Chainlink Request * @param payment The amount of LINK to send for the request * @return requestId The request ID */ function sendOperatorRequestTo( address oracleAddress, Chainlink.Request memory req, uint256 payment ) internal returns (bytes32 requestId) { uint256 nonce = s_requestCount; s_requestCount = nonce + 1; bytes memory encodedRequest = abi.encodeWithSelector( OperatorInterface.operatorRequest.selector, SENDER_OVERRIDE, // Sender value - overridden by onTokenTransfer by the requesting contract's address AMOUNT_OVERRIDE, // Amount value - overridden by onTokenTransfer by the actual amount of LINK sent req.id, req.callbackFunctionId, nonce, OPERATOR_ARGS_VERSION, req.buf.buf ); return _rawRequest(oracleAddress, nonce, payment, encodedRequest); } /** * @notice Make a request to an oracle * @param oracleAddress The address of the oracle for the request * @param nonce used to generate the request ID * @param payment The amount of LINK to send for the request * @param encodedRequest data encoded for request type specific format * @return requestId The request ID */ function _rawRequest( address oracleAddress, uint256 nonce, uint256 payment, bytes memory encodedRequest ) private returns (bytes32 requestId) { requestId = keccak256(abi.encodePacked(this, nonce)); s_pendingRequests[requestId] = oracleAddress; emit ChainlinkRequested(requestId); require(s_link.transferAndCall(oracleAddress, payment, encodedRequest), "unable to transferAndCall to oracle"); } /** * @notice Allows a request to be cancelled if it has not been fulfilled * @dev Requires keeping track of the expiration value emitted from the oracle contract. * Deletes the request from the `pendingRequests` mapping. * Emits ChainlinkCancelled event. * @param requestId The request ID * @param payment The amount of LINK sent for the request * @param callbackFunc The callback function specified for the request * @param expiration The time of the expiration for the request */ function cancelChainlinkRequest( bytes32 requestId, uint256 payment, bytes4 callbackFunc, uint256 expiration ) internal { OperatorInterface requested = OperatorInterface(s_pendingRequests[requestId]); delete s_pendingRequests[requestId]; emit ChainlinkCancelled(requestId); requested.cancelOracleRequest(requestId, payment, callbackFunc, expiration); } /** * @notice the next request count to be used in generating a nonce * @dev starts at 1 in order to ensure consistent gas cost * @return returns the next request count to be used in a nonce */ function getNextRequestCount() internal view returns (uint256) { return s_requestCount; } /** * @notice Sets the stored oracle address * @param oracleAddress The address of the oracle contract */ function setChainlinkOracle(address oracleAddress) internal { s_oracle = OperatorInterface(oracleAddress); } /** * @notice Sets the LINK token address * @param linkAddress The address of the LINK token contract */ function setChainlinkToken(address linkAddress) internal { s_link = LinkTokenInterface(linkAddress); } /** * @notice Sets the Chainlink token address for the public * network as given by the Pointer contract */ function setPublicChainlinkToken() internal { setChainlinkToken(PointerInterface(LINK_TOKEN_POINTER).getAddress()); } /** * @notice Retrieves the stored address of the LINK token * @return The address of the LINK token */ function chainlinkTokenAddress() internal view returns (address) { return address(s_link); } /** * @notice Retrieves the stored address of the oracle contract * @return The address of the oracle contract */ function chainlinkOracleAddress() internal view returns (address) { return address(s_oracle); } /** * @notice Allows for a request which was created on another contract to be fulfilled * on this contract * @param oracleAddress The address of the oracle contract that will fulfill the request * @param requestId The request ID used for the response */ function addChainlinkExternalRequest(address oracleAddress, bytes32 requestId) internal notPendingRequest(requestId) { s_pendingRequests[requestId] = oracleAddress; } /** * @notice Sets the stored oracle and LINK token contracts with the addresses resolved by ENS * @dev Accounts for subnodes having different resolvers * @param ensAddress The address of the ENS contract * @param node The ENS node hash */ function useChainlinkWithENS(address ensAddress, bytes32 node) internal { s_ens = ENSInterface(ensAddress); s_ensNode = node; bytes32 linkSubnode = keccak256(abi.encodePacked(s_ensNode, ENS_TOKEN_SUBNAME)); ENSResolver_Chainlink resolver = ENSResolver_Chainlink(s_ens.resolver(linkSubnode)); setChainlinkToken(resolver.addr(linkSubnode)); updateChainlinkOracleWithENS(); } /** * @notice Sets the stored oracle contract with the address resolved by ENS * @dev This may be called on its own as long as `useChainlinkWithENS` has been called previously */ function updateChainlinkOracleWithENS() internal { bytes32 oracleSubnode = keccak256(abi.encodePacked(s_ensNode, ENS_ORACLE_SUBNAME)); ENSResolver_Chainlink resolver = ENSResolver_Chainlink(s_ens.resolver(oracleSubnode)); setChainlinkOracle(resolver.addr(oracleSubnode)); } /** * @notice Ensures that the fulfillment is valid for this contract * @dev Use if the contract developer prefers methods instead of modifiers for validation * @param requestId The request ID for fulfillment */ function validateChainlinkCallback(bytes32 requestId) internal recordChainlinkFulfillment(requestId) // solhint-disable-next-line no-empty-blocks { } /** * @dev Reverts if the sender is not the oracle of the request. * Emits ChainlinkFulfilled event. * @param requestId The request ID for fulfillment */ modifier recordChainlinkFulfillment(bytes32 requestId) { require(msg.sender == s_pendingRequests[requestId], "Source must be the oracle of the request"); delete s_pendingRequests[requestId]; emit ChainlinkFulfilled(requestId); _; } /** * @dev Reverts if the request is already pending * @param requestId The request ID for fulfillment */ modifier notPendingRequest(bytes32 requestId) { require(s_pendingRequests[requestId] == address(0), "Request is already pending"); _; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./interfaces/LinkTokenInterface.sol"; import "./VRFRequestIDBase.sol"; /** **************************************************************************** * @notice Interface for contracts using VRF randomness * ***************************************************************************** * @dev PURPOSE * * @dev Reggie the Random Oracle (not his real job) wants to provide randomness * @dev to Vera the verifier in such a way that Vera can be sure he's not * @dev making his output up to suit himself. Reggie provides Vera a public key * @dev to which he knows the secret key. Each time Vera provides a seed to * @dev Reggie, he gives back a value which is computed completely * @dev deterministically from the seed and the secret key. * * @dev Reggie provides a proof by which Vera can verify that the output was * @dev correctly computed once Reggie tells it to her, but without that proof, * @dev the output is indistinguishable to her from a uniform random sample * @dev from the output space. * * @dev The purpose of this contract is to make it easy for unrelated contracts * @dev to talk to Vera the verifier about the work Reggie is doing, to provide * @dev simple access to a verifiable source of randomness. * ***************************************************************************** * @dev USAGE * * @dev Calling contracts must inherit from VRFConsumerBase, and can * @dev initialize VRFConsumerBase's attributes in their constructor as * @dev shown: * * @dev contract VRFConsumer { * @dev constructor(<other arguments>, address _vrfCoordinator, address _link) * @dev VRFConsumerBase(_vrfCoordinator, _link) public { * @dev <initialization with other arguments goes here> * @dev } * @dev } * * @dev The oracle will have given you an ID for the VRF keypair they have * @dev committed to (let's call it keyHash), and have told you the minimum LINK * @dev price for VRF service. Make sure your contract has sufficient LINK, and * @dev call requestRandomness(keyHash, fee, seed), where seed is the input you * @dev want to generate randomness from. * * @dev Once the VRFCoordinator has received and validated the oracle's response * @dev to your request, it will call your contract's fulfillRandomness method. * * @dev The randomness argument to fulfillRandomness is the actual random value * @dev generated from your seed. * * @dev The requestId argument is generated from the keyHash and the seed by * @dev makeRequestId(keyHash, seed). If your contract could have concurrent * @dev requests open, you can use the requestId to track which seed is * @dev associated with which randomness. See VRFRequestIDBase.sol for more * @dev details. (See "SECURITY CONSIDERATIONS" for principles to keep in mind, * @dev if your contract could have multiple requests in flight simultaneously.) * * @dev Colliding `requestId`s are cryptographically impossible as long as seeds * @dev differ. (Which is critical to making unpredictable randomness! See the * @dev next section.) * * ***************************************************************************** * @dev SECURITY CONSIDERATIONS * * @dev A method with the ability to call your fulfillRandomness method directly * @dev could spoof a VRF response with any random value, so it's critical that * @dev it cannot be directly called by anything other than this base contract * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method). * * @dev For your users to trust that your contract's random behavior is free * @dev from malicious interference, it's best if you can write it so that all * @dev behaviors implied by a VRF response are executed *during* your * @dev fulfillRandomness method. If your contract must store the response (or * @dev anything derived from it) and use it later, you must ensure that any * @dev user-significant behavior which depends on that stored value cannot be * @dev manipulated by a subsequent VRF request. * * @dev Similarly, both miners and the VRF oracle itself have some influence * @dev over the order in which VRF responses appear on the blockchain, so if * @dev your contract could have multiple VRF requests in flight simultaneously, * @dev you must ensure that the order in which the VRF responses arrive cannot * @dev be used to manipulate your contract's user-significant behavior. * * @dev Since the ultimate input to the VRF is mixed with the block hash of the * @dev block in which the request is made, user-provided seeds have no impact * @dev on its economic security properties. They are only included for API * @dev compatability with previous versions of this contract. * * @dev Since the block hash of the block which contains the requestRandomness * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful * @dev miner could, in principle, fork the blockchain to evict the block * @dev containing the request, forcing the request to be included in a * @dev different block with a different hash, and therefore a different input * @dev to the VRF. However, such an attack would incur a substantial economic * @dev cost. This cost scales with the number of blocks the VRF oracle waits * @dev until it calls responds to a request. */ abstract contract VRFConsumerBase is VRFRequestIDBase { /** * @notice fulfillRandomness handles the VRF response. Your contract must * @notice implement it. See "SECURITY CONSIDERATIONS" above for important * @notice principles to keep in mind when implementing your fulfillRandomness * @notice method. * * @dev VRFConsumerBase expects its subcontracts to have a method with this * @dev signature, and will call it once it has verified the proof * @dev associated with the randomness. (It is triggered via a call to * @dev rawFulfillRandomness, below.) * * @param requestId The Id initially returned by requestRandomness * @param randomness the VRF output */ function fulfillRandomness(bytes32 requestId, uint256 randomness) internal virtual; /** * @dev In order to keep backwards compatibility we have kept the user * seed field around. We remove the use of it because given that the blockhash * enters later, it overrides whatever randomness the used seed provides. * Given that it adds no security, and can easily lead to misunderstandings, * we have removed it from usage and can now provide a simpler API. */ uint256 private constant USER_SEED_PLACEHOLDER = 0; /** * @notice requestRandomness initiates a request for VRF output given _seed * * @dev The fulfillRandomness method receives the output, once it's provided * @dev by the Oracle, and verified by the vrfCoordinator. * * @dev The _keyHash must already be registered with the VRFCoordinator, and * @dev the _fee must exceed the fee specified during registration of the * @dev _keyHash. * * @dev The _seed parameter is vestigial, and is kept only for API * @dev compatibility with older versions. It can't *hurt* to mix in some of * @dev your own randomness, here, but it's not necessary because the VRF * @dev oracle will mix the hash of the block containing your request into the * @dev VRF seed it ultimately uses. * * @param _keyHash ID of public key against which randomness is generated * @param _fee The amount of LINK to send with the request * * @return requestId unique ID for this request * * @dev The returned requestId can be used to distinguish responses to * @dev concurrent requests. It is passed as the first argument to * @dev fulfillRandomness. */ function requestRandomness(bytes32 _keyHash, uint256 _fee) internal returns (bytes32 requestId) { LINK.transferAndCall(vrfCoordinator, _fee, abi.encode(_keyHash, USER_SEED_PLACEHOLDER)); // This is the seed passed to VRFCoordinator. The oracle will mix this with // the hash of the block containing this request to obtain the seed/input // which is finally passed to the VRF cryptographic machinery. uint256 vRFSeed = makeVRFInputSeed(_keyHash, USER_SEED_PLACEHOLDER, address(this), nonces[_keyHash]); // nonces[_keyHash] must stay in sync with // VRFCoordinator.nonces[_keyHash][this], which was incremented by the above // successful LINK.transferAndCall (in VRFCoordinator.randomnessRequest). // This provides protection against the user repeating their input seed, // which would result in a predictable/duplicate output, if multiple such // requests appeared in the same block. nonces[_keyHash] = nonces[_keyHash] + 1; return makeRequestId(_keyHash, vRFSeed); } LinkTokenInterface internal immutable LINK; address private immutable vrfCoordinator; // Nonces for each VRF key from which randomness has been requested. // // Must stay in sync with VRFCoordinator[_keyHash][this] mapping(bytes32 => uint256) /* keyHash */ /* nonce */ private nonces; /** * @param _vrfCoordinator address of VRFCoordinator contract * @param _link address of LINK token contract * * @dev https://docs.chain.link/docs/link-token-contracts */ constructor(address _vrfCoordinator, address _link) { vrfCoordinator = _vrfCoordinator; LINK = LinkTokenInterface(_link); } // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF // proof. rawFulfillRandomness then calls fulfillRandomness, after validating // the origin of the call function rawFulfillRandomness(bytes32 requestId, uint256 randomness) external { require(msg.sender == vrfCoordinator, "Only VRFCoordinator can fulfill"); fulfillRandomness(requestId, randomness); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/structs/EnumerableSet.sol) pragma solidity ^0.8.0; /** * @dev Library for managing * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive * types. * * Sets have the following properties: * * - Elements are added, removed, and checked for existence in constant time * (O(1)). * - Elements are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableSet for EnumerableSet.AddressSet; * * // Declare a set state variable * EnumerableSet.AddressSet private mySet; * } * ``` * * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`) * and `uint256` (`UintSet`) are supported. */ library EnumerableSet { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Set type with // bytes32 values. // The Set implementation uses private functions, and user-facing // implementations (such as AddressSet) are just wrappers around the // underlying Set. // This means that we can only create new EnumerableSets for types that fit // in bytes32. struct Set { // Storage of set values bytes32[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping(bytes32 => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function _add(Set storage set, bytes32 value) private returns (bool) { if (!_contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function _remove(Set storage set, bytes32 value) private returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; if (lastIndex != toDeleteIndex) { bytes32 lastvalue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastvalue; // Update the index for the moved value set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex } // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function _contains(Set storage set, bytes32 value) private view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function _length(Set storage set) private view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Set storage set, uint256 index) private view returns (bytes32) { return set._values[index]; } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function _values(Set storage set) private view returns (bytes32[] memory) { return set._values; } // Bytes32Set struct Bytes32Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _add(set._inner, value); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values in the set. O(1). */ function length(Bytes32Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) { return _at(set._inner, index); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(Bytes32Set storage set) internal view returns (bytes32[] memory) { return _values(set._inner); } // AddressSet struct AddressSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { return _add(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { return _remove(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return _contains(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns the number of values in the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { return address(uint160(uint256(_at(set._inner, index)))); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(AddressSet storage set) internal view returns (address[] memory) { bytes32[] memory store = _values(set._inner); address[] memory result; assembly { result := store } return result; } // UintSet struct UintSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UintSet storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UintSet storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UintSet storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values on the set. O(1). */ function length(UintSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintSet storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(UintSet storage set) internal view returns (uint256[] memory) { bytes32[] memory store = _values(set._inner); uint256[] memory result; assembly { result := store } return result; } }
// 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 v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol) pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Enumerable is IERC721 { /** * @dev Returns the total amount of tokens stored by the contract. */ function totalSupply() external view returns (uint256); /** * @dev Returns a token ID owned by `owner` at a given `index` of its token list. * Use along with {balanceOf} to enumerate all of ``owner``'s tokens. */ function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256); /** * @dev Returns a token ID at a given `index` of all the tokens stored by the contract. * Use along with {totalSupply} to enumerate all tokens. */ function tokenByIndex(uint256 index) external view returns (uint256); }
// 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/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @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] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// 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 v4.4.1 (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 `IERC721.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract VRFRequestIDBase { /** * @notice returns the seed which is actually input to the VRF coordinator * * @dev To prevent repetition of VRF output due to repetition of the * @dev user-supplied seed, that seed is combined in a hash with the * @dev user-specific nonce, and the address of the consuming contract. The * @dev risk of repetition is mostly mitigated by inclusion of a blockhash in * @dev the final seed, but the nonce does protect against repetition in * @dev requests which are included in a single block. * * @param _userSeed VRF seed input provided by user * @param _requester Address of the requesting contract * @param _nonce User-specific nonce at the time of the request */ function makeVRFInputSeed( bytes32 _keyHash, uint256 _userSeed, address _requester, uint256 _nonce ) internal pure returns (uint256) { return uint256(keccak256(abi.encode(_keyHash, _userSeed, _requester, _nonce))); } /** * @notice Returns the id for this request * @param _keyHash The serviceAgreement ID to be used for this request * @param _vRFInputSeed The seed to be passed directly to the VRF * @return The id for this request * * @dev Note that _vRFInputSeed is not the seed passed by the consuming * @dev contract, but the one generated by makeVRFInputSeed */ function makeRequestId(bytes32 _keyHash, uint256 _vRFInputSeed) internal pure returns (bytes32) { return keccak256(abi.encodePacked(_keyHash, _vRFInputSeed)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface LinkTokenInterface { function allowance(address owner, address spender) external view returns (uint256 remaining); function approve(address spender, uint256 value) external returns (bool success); function balanceOf(address owner) external view returns (uint256 balance); function decimals() external view returns (uint8 decimalPlaces); function decreaseApproval(address spender, uint256 addedValue) external returns (bool success); function increaseApproval(address spender, uint256 subtractedValue) external; function name() external view returns (string memory tokenName); function symbol() external view returns (string memory tokenSymbol); function totalSupply() external view returns (uint256 totalTokensIssued); function transfer(address to, uint256 value) external returns (bool success); function transferAndCall( address to, uint256 value, bytes calldata data ) external returns (bool success); function transferFrom( address from, address to, uint256 value ) external returns (bool success); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; abstract contract ENSResolver { function addr(bytes32 node) public view virtual returns (address); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface PointerInterface { function getAddress() external view returns (address); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./OracleInterface.sol"; import "./ChainlinkRequestInterface.sol"; interface OperatorInterface is OracleInterface, ChainlinkRequestInterface { function operatorRequest( address sender, uint256 payment, bytes32 specId, bytes4 callbackFunctionId, uint256 nonce, uint256 dataVersion, bytes calldata data ) external; function fulfillOracleRequest2( bytes32 requestId, uint256 payment, address callbackAddress, bytes4 callbackFunctionId, uint256 expiration, bytes calldata data ) external returns (bool); function ownerTransferAndCall( address to, uint256 value, bytes calldata data ) external returns (bool success); function distributeFunds(address payable[] calldata receivers, uint256[] calldata amounts) external payable; function getAuthorizedSenders() external returns (address[] memory); function setAuthorizedSenders(address[] calldata senders) external; function getForwarder() external returns (address); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface ChainlinkRequestInterface { function oracleRequest( address sender, uint256 requestPrice, bytes32 serviceAgreementID, address callbackAddress, bytes4 callbackFunctionId, uint256 nonce, uint256 dataVersion, bytes calldata data ) external; function cancelOracleRequest( bytes32 requestId, uint256 payment, bytes4 callbackFunctionId, uint256 expiration ) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface ENSInterface { // Logged when the owner of a node assigns a new owner to a subnode. event NewOwner(bytes32 indexed node, bytes32 indexed label, address owner); // Logged when the owner of a node transfers ownership to a new account. event Transfer(bytes32 indexed node, address owner); // Logged when the resolver for a node changes. event NewResolver(bytes32 indexed node, address resolver); // Logged when the TTL of a node changes event NewTTL(bytes32 indexed node, uint64 ttl); function setSubnodeOwner( bytes32 node, bytes32 label, address owner ) external; function setResolver(bytes32 node, address resolver) external; function setOwner(bytes32 node, address owner) external; function setTTL(bytes32 node, uint64 ttl) external; function owner(bytes32 node) external view returns (address); function resolver(bytes32 node) external view returns (address); function ttl(bytes32 node) external view returns (uint64); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import {CBORChainlink} from "./vendor/CBORChainlink.sol"; import {BufferChainlink} from "./vendor/BufferChainlink.sol"; /** * @title Library for common Chainlink functions * @dev Uses imported CBOR library for encoding to buffer */ library Chainlink { uint256 internal constant defaultBufferSize = 256; // solhint-disable-line const-name-snakecase using CBORChainlink for BufferChainlink.buffer; struct Request { bytes32 id; address callbackAddress; bytes4 callbackFunctionId; uint256 nonce; BufferChainlink.buffer buf; } /** * @notice Initializes a Chainlink request * @dev Sets the ID, callback address, and callback function signature on the request * @param self The uninitialized request * @param jobId The Job Specification ID * @param callbackAddr The callback address * @param callbackFunc The callback function signature * @return The initialized request */ function initialize( Request memory self, bytes32 jobId, address callbackAddr, bytes4 callbackFunc ) internal pure returns (Chainlink.Request memory) { BufferChainlink.init(self.buf, defaultBufferSize); self.id = jobId; self.callbackAddress = callbackAddr; self.callbackFunctionId = callbackFunc; return self; } /** * @notice Sets the data for the buffer without encoding CBOR on-chain * @dev CBOR can be closed with curly-brackets {} or they can be left off * @param self The initialized request * @param data The CBOR data */ function setBuffer(Request memory self, bytes memory data) internal pure { BufferChainlink.init(self.buf, data.length); BufferChainlink.append(self.buf, data); } /** * @notice Adds a string value to the request with a given key name * @param self The initialized request * @param key The name of the key * @param value The string value to add */ function add( Request memory self, string memory key, string memory value ) internal pure { self.buf.encodeString(key); self.buf.encodeString(value); } /** * @notice Adds a bytes value to the request with a given key name * @param self The initialized request * @param key The name of the key * @param value The bytes value to add */ function addBytes( Request memory self, string memory key, bytes memory value ) internal pure { self.buf.encodeString(key); self.buf.encodeBytes(value); } /** * @notice Adds a int256 value to the request with a given key name * @param self The initialized request * @param key The name of the key * @param value The int256 value to add */ function addInt( Request memory self, string memory key, int256 value ) internal pure { self.buf.encodeString(key); self.buf.encodeInt(value); } /** * @notice Adds a uint256 value to the request with a given key name * @param self The initialized request * @param key The name of the key * @param value The uint256 value to add */ function addUint( Request memory self, string memory key, uint256 value ) internal pure { self.buf.encodeString(key); self.buf.encodeUInt(value); } /** * @notice Adds an array of strings to the request with a given key name * @param self The initialized request * @param key The name of the key * @param values The array of string values to add */ function addStringArray( Request memory self, string memory key, string[] memory values ) internal pure { self.buf.encodeString(key); self.buf.startArray(); for (uint256 i = 0; i < values.length; i++) { self.buf.encodeString(values[i]); } self.buf.endSequence(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface OracleInterface { function fulfillOracleRequest( bytes32 requestId, uint256 payment, address callbackAddress, bytes4 callbackFunctionId, uint256 expiration, bytes32 data ) external returns (bool); function isAuthorizedSender(address node) external view returns (bool); function withdraw(address recipient, uint256 amount) external; function withdrawable() external view returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev A library for working with mutable byte buffers in Solidity. * * Byte buffers are mutable and expandable, and provide a variety of primitives * for writing to them. At any time you can fetch a bytes object containing the * current contents of the buffer. The bytes object should not be stored between * operations, as it may change due to resizing of the buffer. */ library BufferChainlink { /** * @dev Represents a mutable buffer. Buffers have a current value (buf) and * a capacity. The capacity may be longer than the current value, in * which case it can be extended without the need to allocate more memory. */ struct buffer { bytes buf; uint256 capacity; } /** * @dev Initializes a buffer with an initial capacity. * @param buf The buffer to initialize. * @param capacity The number of bytes of space to allocate the buffer. * @return The buffer, for chaining. */ function init(buffer memory buf, uint256 capacity) internal pure returns (buffer memory) { if (capacity % 32 != 0) { capacity += 32 - (capacity % 32); } // Allocate space for the buffer data buf.capacity = capacity; assembly { let ptr := mload(0x40) mstore(buf, ptr) mstore(ptr, 0) mstore(0x40, add(32, add(ptr, capacity))) } return buf; } /** * @dev Initializes a new buffer from an existing bytes object. * Changes to the buffer may mutate the original value. * @param b The bytes object to initialize the buffer with. * @return A new buffer. */ function fromBytes(bytes memory b) internal pure returns (buffer memory) { buffer memory buf; buf.buf = b; buf.capacity = b.length; return buf; } function resize(buffer memory buf, uint256 capacity) private pure { bytes memory oldbuf = buf.buf; init(buf, capacity); append(buf, oldbuf); } function max(uint256 a, uint256 b) private pure returns (uint256) { if (a > b) { return a; } return b; } /** * @dev Sets buffer length to 0. * @param buf The buffer to truncate. * @return The original buffer, for chaining.. */ function truncate(buffer memory buf) internal pure returns (buffer memory) { assembly { let bufptr := mload(buf) mstore(bufptr, 0) } return buf; } /** * @dev Writes a byte string to a buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param off The start offset to write to. * @param data The data to append. * @param len The number of bytes to copy. * @return The original buffer, for chaining. */ function write( buffer memory buf, uint256 off, bytes memory data, uint256 len ) internal pure returns (buffer memory) { require(len <= data.length); if (off + len > buf.capacity) { resize(buf, max(buf.capacity, len + off) * 2); } uint256 dest; uint256 src; assembly { // Memory address of the buffer data let bufptr := mload(buf) // Length of existing buffer data let buflen := mload(bufptr) // Start address = buffer address + offset + sizeof(buffer length) dest := add(add(bufptr, 32), off) // Update buffer length if we're extending it if gt(add(len, off), buflen) { mstore(bufptr, add(len, off)) } src := add(data, 32) } // Copy word-length chunks while possible for (; len >= 32; len -= 32) { assembly { mstore(dest, mload(src)) } dest += 32; src += 32; } // Copy remaining bytes unchecked { uint256 mask = (256**(32 - len)) - 1; assembly { let srcpart := and(mload(src), not(mask)) let destpart := and(mload(dest), mask) mstore(dest, or(destpart, srcpart)) } } return buf; } /** * @dev Appends a byte string to a buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @param len The number of bytes to copy. * @return The original buffer, for chaining. */ function append( buffer memory buf, bytes memory data, uint256 len ) internal pure returns (buffer memory) { return write(buf, buf.buf.length, data, len); } /** * @dev Appends a byte string to a buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @return The original buffer, for chaining. */ function append(buffer memory buf, bytes memory data) internal pure returns (buffer memory) { return write(buf, buf.buf.length, data, data.length); } /** * @dev Writes a byte to the buffer. Resizes if doing so would exceed the * capacity of the buffer. * @param buf The buffer to append to. * @param off The offset to write the byte at. * @param data The data to append. * @return The original buffer, for chaining. */ function writeUint8( buffer memory buf, uint256 off, uint8 data ) internal pure returns (buffer memory) { if (off >= buf.capacity) { resize(buf, buf.capacity * 2); } assembly { // Memory address of the buffer data let bufptr := mload(buf) // Length of existing buffer data let buflen := mload(bufptr) // Address = buffer address + sizeof(buffer length) + off let dest := add(add(bufptr, off), 32) mstore8(dest, data) // Update buffer length if we extended it if eq(off, buflen) { mstore(bufptr, add(buflen, 1)) } } return buf; } /** * @dev Appends a byte to the buffer. Resizes if doing so would exceed the * capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @return The original buffer, for chaining. */ function appendUint8(buffer memory buf, uint8 data) internal pure returns (buffer memory) { return writeUint8(buf, buf.buf.length, data); } /** * @dev Writes up to 32 bytes to the buffer. Resizes if doing so would * exceed the capacity of the buffer. * @param buf The buffer to append to. * @param off The offset to write at. * @param data The data to append. * @param len The number of bytes to write (left-aligned). * @return The original buffer, for chaining. */ function write( buffer memory buf, uint256 off, bytes32 data, uint256 len ) private pure returns (buffer memory) { if (len + off > buf.capacity) { resize(buf, (len + off) * 2); } unchecked { uint256 mask = (256**len) - 1; // Right-align data data = data >> (8 * (32 - len)); assembly { // Memory address of the buffer data let bufptr := mload(buf) // Address = buffer address + sizeof(buffer length) + off + len let dest := add(add(bufptr, off), len) mstore(dest, or(and(mload(dest), not(mask)), data)) // Update buffer length if we extended it if gt(add(off, len), mload(bufptr)) { mstore(bufptr, add(off, len)) } } } return buf; } /** * @dev Writes a bytes20 to the buffer. Resizes if doing so would exceed the * capacity of the buffer. * @param buf The buffer to append to. * @param off The offset to write at. * @param data The data to append. * @return The original buffer, for chaining. */ function writeBytes20( buffer memory buf, uint256 off, bytes20 data ) internal pure returns (buffer memory) { return write(buf, off, bytes32(data), 20); } /** * @dev Appends a bytes20 to the buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @return The original buffer, for chhaining. */ function appendBytes20(buffer memory buf, bytes20 data) internal pure returns (buffer memory) { return write(buf, buf.buf.length, bytes32(data), 20); } /** * @dev Appends a bytes32 to the buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @return The original buffer, for chaining. */ function appendBytes32(buffer memory buf, bytes32 data) internal pure returns (buffer memory) { return write(buf, buf.buf.length, data, 32); } /** * @dev Writes an integer to the buffer. Resizes if doing so would exceed * the capacity of the buffer. * @param buf The buffer to append to. * @param off The offset to write at. * @param data The data to append. * @param len The number of bytes to write (right-aligned). * @return The original buffer, for chaining. */ function writeInt( buffer memory buf, uint256 off, uint256 data, uint256 len ) private pure returns (buffer memory) { if (len + off > buf.capacity) { resize(buf, (len + off) * 2); } uint256 mask = (256**len) - 1; assembly { // Memory address of the buffer data let bufptr := mload(buf) // Address = buffer address + off + sizeof(buffer length) + len let dest := add(add(bufptr, off), len) mstore(dest, or(and(mload(dest), not(mask)), data)) // Update buffer length if we extended it if gt(add(off, len), mload(bufptr)) { mstore(bufptr, add(off, len)) } } return buf; } /** * @dev Appends a byte to the end of the buffer. Resizes if doing so would * exceed the capacity of the buffer. * @param buf The buffer to append to. * @param data The data to append. * @return The original buffer. */ function appendInt( buffer memory buf, uint256 data, uint256 len ) internal pure returns (buffer memory) { return writeInt(buf, buf.buf.length, data, len); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.4.19; import {BufferChainlink} from "./BufferChainlink.sol"; library CBORChainlink { using BufferChainlink for BufferChainlink.buffer; uint8 private constant MAJOR_TYPE_INT = 0; uint8 private constant MAJOR_TYPE_NEGATIVE_INT = 1; uint8 private constant MAJOR_TYPE_BYTES = 2; uint8 private constant MAJOR_TYPE_STRING = 3; uint8 private constant MAJOR_TYPE_ARRAY = 4; uint8 private constant MAJOR_TYPE_MAP = 5; uint8 private constant MAJOR_TYPE_TAG = 6; uint8 private constant MAJOR_TYPE_CONTENT_FREE = 7; uint8 private constant TAG_TYPE_BIGNUM = 2; uint8 private constant TAG_TYPE_NEGATIVE_BIGNUM = 3; function encodeFixedNumeric(BufferChainlink.buffer memory buf, uint8 major, uint64 value) private pure { if(value <= 23) { buf.appendUint8(uint8((major << 5) | value)); } else if (value <= 0xFF) { buf.appendUint8(uint8((major << 5) | 24)); buf.appendInt(value, 1); } else if (value <= 0xFFFF) { buf.appendUint8(uint8((major << 5) | 25)); buf.appendInt(value, 2); } else if (value <= 0xFFFFFFFF) { buf.appendUint8(uint8((major << 5) | 26)); buf.appendInt(value, 4); } else { buf.appendUint8(uint8((major << 5) | 27)); buf.appendInt(value, 8); } } function encodeIndefiniteLengthType(BufferChainlink.buffer memory buf, uint8 major) private pure { buf.appendUint8(uint8((major << 5) | 31)); } function encodeUInt(BufferChainlink.buffer memory buf, uint value) internal pure { if(value > 0xFFFFFFFFFFFFFFFF) { encodeBigNum(buf, value); } else { encodeFixedNumeric(buf, MAJOR_TYPE_INT, uint64(value)); } } function encodeInt(BufferChainlink.buffer memory buf, int value) internal pure { if(value < -0x10000000000000000) { encodeSignedBigNum(buf, value); } else if(value > 0xFFFFFFFFFFFFFFFF) { encodeBigNum(buf, uint(value)); } else if(value >= 0) { encodeFixedNumeric(buf, MAJOR_TYPE_INT, uint64(uint256(value))); } else { encodeFixedNumeric(buf, MAJOR_TYPE_NEGATIVE_INT, uint64(uint256(-1 - value))); } } function encodeBytes(BufferChainlink.buffer memory buf, bytes memory value) internal pure { encodeFixedNumeric(buf, MAJOR_TYPE_BYTES, uint64(value.length)); buf.append(value); } function encodeBigNum(BufferChainlink.buffer memory buf, uint value) internal pure { buf.appendUint8(uint8((MAJOR_TYPE_TAG << 5) | TAG_TYPE_BIGNUM)); encodeBytes(buf, abi.encode(value)); } function encodeSignedBigNum(BufferChainlink.buffer memory buf, int input) internal pure { buf.appendUint8(uint8((MAJOR_TYPE_TAG << 5) | TAG_TYPE_NEGATIVE_BIGNUM)); encodeBytes(buf, abi.encode(uint256(-1 - input))); } function encodeString(BufferChainlink.buffer memory buf, string memory value) internal pure { encodeFixedNumeric(buf, MAJOR_TYPE_STRING, uint64(bytes(value).length)); buf.append(bytes(value)); } function startArray(BufferChainlink.buffer memory buf) internal pure { encodeIndefiniteLengthType(buf, MAJOR_TYPE_ARRAY); } function startMap(BufferChainlink.buffer memory buf) internal pure { encodeIndefiniteLengthType(buf, MAJOR_TYPE_MAP); } function endSequence(BufferChainlink.buffer memory buf) internal pure { encodeIndefiniteLengthType(buf, MAJOR_TYPE_CONTENT_FREE); } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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ship","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawBalance","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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