zellic-audit
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{
"language": "Solidity",
"sources": {
"contracts/Raffle.sol": {
"content": "// SPDX-License-Identifier: MIT\r\npragma solidity ^0.8.9;\r\n\r\nimport \"contracts/ICryptoPunk.sol\";\r\nimport \"contracts/TicketStorage.sol\";\r\n\r\nimport \"@chainlink/contracts/src/v0.8/interfaces/VRFCoordinatorV2Interface.sol\";\r\nimport \"@chainlink/contracts/src/v0.8/VRFConsumerBaseV2.sol\";\r\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\r\nimport \"@openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol\";\r\nimport \"@openzeppelin/contracts/token/ERC1155/IERC1155.sol\";\r\nimport \"@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol\";\r\nimport \"@openzeppelin/contracts/token/ERC721/IERC721.sol\";\r\nimport \"@openzeppelin/contracts/security/PullPayment.sol\";\r\n\r\n/**\r\n * @dev This contract is used to represent BoredLucky raffle. It supports CryptoPunks, ERC721 and ERC1155 NFTs.\r\n *\r\n * Raffle relies on Chainlink VRF to draw the winner.\r\n *\r\n * Raffle ensures that buyers will get a fair chance of winning (proportional to the number of purchased tickets), or\r\n * a way to get ETH back if raffle gets cancelled.\r\n *\r\n * Raffle can start only after the correct NFT is transferred to the account.\r\n *\r\n * Each raffle has an `owner`, the admin account that has the following abilities:\r\n * - gets ETH after the raffle is completed\r\n * - gets back the NFT if raffle is cancelled\r\n * - able to giveaway tickets\r\n * - able to cancel raffle before it has started (e.g. created with wrong parameters)\r\n *\r\n * Raffle gets cancelled if:\r\n * - not all tickets are sold before `endTimestamp`\r\n * - `owner` cancels it before start\r\n * - for some reason we do not have response from Chainlink VRF for one day after we request random number\r\n *\r\n * In any scenario, raffle cannot get stuck and users have a fair chance to win or get ETH back.\r\n *\r\n * `PullPayments` are used where possible to increase security.\r\n *\r\n * The lifecycle of raffle consist of following states:\r\n * - WaitingForNFT: after raffle is created, it waits for\r\n * - WaitingForStart: correct NFT is transferred and we wait for `startTimestamp`\r\n * - SellingTickets: it possible to purchase tickets\r\n * - WaitingForRNG: all tickets are sold, we wait for Chainlink VRF to send random number\r\n * - Completed (terminal) -- we know the winner, it can get NFT, raffle owner can get ETH\r\n * - Cancelled (terminal) -- raffle cancelled, buyers can get back their ETH, owner can get NFT\r\n */\r\ncontract Raffle is Ownable, TicketStorage, ERC1155Holder, ERC721Holder, PullPayment, VRFConsumerBaseV2 {\r\n event WinnerDrawn(uint16 ticketNumber, address owner);\r\n\r\n enum State {\r\n WaitingForNFT,\r\n WaitingForStart,\r\n SellingTickets,\r\n WaitingForRNG,\r\n Completed,\r\n Cancelled\r\n }\r\n State private _state;\r\n\r\n address public immutable nftContract;\r\n uint256 public immutable nftTokenId;\r\n enum NFTStandard {\r\n CryptoPunks,\r\n ERC721,\r\n ERC1155\r\n }\r\n NFTStandard public immutable nftStandard;\r\n\r\n uint256 public immutable ticketPrice;\r\n uint256 public immutable startTimestamp;\r\n uint256 public immutable endTimestamp;\r\n\r\n uint16 private _soldTickets;\r\n uint16 private _giveawayTickets;\r\n mapping(address => uint16) private _addressToPurchasedCountMap;\r\n\r\n uint256 private _cancelTimestamp;\r\n uint256 private _transferNFTToWinnerTimestamp;\r\n\r\n uint256 private _winnerDrawTimestamp;\r\n uint16 private _winnerTicketNumber;\r\n address private _winnerAddress;\r\n\r\n VRFCoordinatorV2Interface immutable VRF_COORDINATOR;\r\n uint64 immutable vrfSubscriptionId;\r\n bytes32 immutable vrfKeyHash;\r\n uint256[] public vrfRandomWords;\r\n uint256 public vrfRequestId;\r\n\r\n uint32 constant VRF_CALLBACK_GAS_LIMIT = 300_000;\r\n uint16 constant VRF_REQUEST_CONFIRMATIONS = 20;\r\n uint16 constant VRF_NUM_WORDS = 1;\r\n\r\n constructor(\r\n address _nftContract,\r\n uint256 _nftTokenId,\r\n uint256 _nftStandardId,\r\n uint16 _tickets,\r\n uint256 _ticketPrice,\r\n uint256 _startTimestamp,\r\n uint256 _endTimestamp,\r\n uint64 _vrfSubscriptionId,\r\n address _vrfCoordinator,\r\n bytes32 _vrfKeyHash\r\n ) TicketStorage(_tickets) VRFConsumerBaseV2(_vrfCoordinator) {\r\n require(block.timestamp < _startTimestamp, \"Start timestamp cannot be in the past\");\r\n require(_endTimestamp > _startTimestamp, \"End timestamp must be after start timestamp\");\r\n require(_nftContract != address(0), \"NFT contract cannot be 0x0\");\r\n nftStandard = NFTStandard(_nftStandardId);\r\n require(\r\n nftStandard == NFTStandard.CryptoPunks || nftStandard == NFTStandard.ERC721 || nftStandard == NFTStandard.ERC1155,\r\n \"Not supported NFT standard\"\r\n );\r\n\r\n nftContract = _nftContract;\r\n nftTokenId = _nftTokenId;\r\n ticketPrice = _ticketPrice;\r\n startTimestamp = _startTimestamp;\r\n endTimestamp = _endTimestamp;\r\n VRF_COORDINATOR = VRFCoordinatorV2Interface(_vrfCoordinator);\r\n vrfKeyHash = _vrfKeyHash;\r\n vrfSubscriptionId = _vrfSubscriptionId;\r\n\r\n _state = State.WaitingForNFT;\r\n }\r\n\r\n /**\r\n * @dev Purchases raffle tickets.\r\n *\r\n * If last ticket is sold, triggers {_requestRandomWords} to request random number from Chainlink VRF.\r\n *\r\n * Requirements:\r\n * - must be in SellingTickets state\r\n * - cannot purchase after `endTimestamp`\r\n * - cannot purchase 0 tickets\r\n * - must have correct `value` of ETH\r\n */\r\n function purchaseTicket(uint16 count) external payable {\r\n if (_state == State.WaitingForStart) {\r\n if (block.timestamp > startTimestamp && block.timestamp < endTimestamp) {\r\n _state = State.SellingTickets;\r\n }\r\n }\r\n require(_state == State.SellingTickets, \"Must be in SellingTickets\");\r\n require(block.timestamp < endTimestamp, \"End timestamp must be in the future\");\r\n require(count > 0, \"Ticket count must be more than 0\");\r\n require(msg.value == ticketPrice * count, \"Incorrect purchase amount (must be ticketPrice * count)\");\r\n\r\n _assignTickets(msg.sender, count);\r\n _soldTickets += count;\r\n assert(_tickets == _ticketsLeft + _soldTickets + _giveawayTickets);\r\n\r\n _addressToPurchasedCountMap[msg.sender] += count;\r\n\r\n if (_ticketsLeft == 0) {\r\n _state = State.WaitingForRNG;\r\n _requestRandomWords();\r\n }\r\n }\r\n\r\n struct AddressAndCount {\r\n address receiverAddress;\r\n uint16 count;\r\n }\r\n\r\n /**\r\n * @dev Giveaway tickets. `owner` of raffle can giveaway free tickets, used for promotion.\r\n *\r\n * It is possible to giveaway tickets before start, ensuring that promised tickets for promotions can be assigned,\r\n * otherwise if raffle is quickly sold out, we may not able to do it in time.\r\n *\r\n * If last ticket is given out, triggers {_requestRandomWords} to request random number from Chainlink VRF.\r\n *\r\n * Requirements:\r\n * - must be in WaitingForStart or SellingTickets state\r\n * - cannot giveaway after `endTimestamp`\r\n */\r\n function giveawayTicket(AddressAndCount[] memory receivers) external onlyOwner {\r\n require(\r\n _state == State.WaitingForStart || _state == State.SellingTickets,\r\n \"Must be in WaitingForStart or SellingTickets\"\r\n );\r\n\r\n if (_state == State.WaitingForStart) {\r\n if (block.timestamp > startTimestamp && block.timestamp < endTimestamp) {\r\n _state = State.SellingTickets;\r\n }\r\n }\r\n require(block.timestamp < endTimestamp, \"End timestamp must be in the future\");\r\n\r\n for (uint256 i = 0; i < receivers.length; i++) {\r\n AddressAndCount memory item = receivers[i];\r\n\r\n _assignTickets(item.receiverAddress, item.count);\r\n _giveawayTickets += item.count;\r\n assert(_tickets == _ticketsLeft + _soldTickets + _giveawayTickets);\r\n }\r\n\r\n if (_ticketsLeft == 0) {\r\n _state = State.WaitingForRNG;\r\n _requestRandomWords();\r\n }\r\n }\r\n\r\n /**\r\n * @dev After the correct NFT (specified in raffle constructor) is transferred to raffle contract,\r\n * this method must be invoked to verify it and move raffle into WaitingForStart state.\r\n *\r\n * Requirements:\r\n * - must be in WaitingForNFT state\r\n */\r\n function verifyNFTPresenceBeforeStart() external {\r\n require(_state == State.WaitingForNFT, \"Must be in WaitingForNFT\");\r\n\r\n if (nftStandard == NFTStandard.CryptoPunks) {\r\n if (ICryptoPunk(nftContract).punkIndexToAddress(nftTokenId) == address(this)) {\r\n _state = State.WaitingForStart;\r\n }\r\n }\r\n else if (nftStandard == NFTStandard.ERC721) {\r\n if (IERC721(nftContract).ownerOf(nftTokenId) == address(this)) {\r\n _state = State.WaitingForStart;\r\n }\r\n }\r\n else if (nftStandard == NFTStandard.ERC1155) {\r\n if (IERC1155(nftContract).balanceOf(address(this), nftTokenId) == 1) {\r\n _state = State.WaitingForStart;\r\n }\r\n }\r\n }\r\n\r\n /**\r\n * @dev Cancels raffle before it has started.\r\n *\r\n * Only raffle `owner` can do it and it is needed in case raffle was created incorrectly.\r\n *\r\n * Requirements:\r\n * - must be in WaitingForNFT or WaitingForStart state\r\n */\r\n function cancelBeforeStart() external onlyOwner {\r\n require(\r\n _state == State.WaitingForNFT || _state == State.WaitingForStart,\r\n \"Must be in WaitingForNFT or WaitingForStart\"\r\n );\r\n\r\n _state = State.Cancelled;\r\n _cancelTimestamp = block.timestamp;\r\n }\r\n\r\n /**\r\n * @dev Cancels raffle if not all tickets were sold.\r\n *\r\n * Anyone can call this method after `endTimestamp`.\r\n *\r\n * Requirements:\r\n * - must be in SellingTickets state\r\n */\r\n function cancelIfUnsold() external {\r\n require(\r\n _state == State.WaitingForStart || _state == State.SellingTickets,\r\n \"Must be in WaitingForStart or SellingTickets\"\r\n );\r\n require(block.timestamp > endTimestamp, \"End timestamp must be in the past\");\r\n\r\n _state = State.Cancelled;\r\n _cancelTimestamp = block.timestamp;\r\n }\r\n\r\n /**\r\n * @dev Cancels raffle if there is no response from Chainlink VRF.\r\n *\r\n * Anyone can call this method after `endTimestamp` + 1 day.\r\n *\r\n * Requirements:\r\n * - must be in WaitingForRNG state\r\n */\r\n function cancelIfNoRNG() external {\r\n require(_state == State.WaitingForRNG, \"Must be in WaitingForRNG\");\r\n require(block.timestamp > endTimestamp + 1 days, \"End timestamp + 1 day must be in the past\");\r\n\r\n _state = State.Cancelled;\r\n _cancelTimestamp = block.timestamp;\r\n }\r\n\r\n /**\r\n * @dev Transfers purchased ticket refund into internal escrow, after that user can claim ETH\r\n * using {PullPayment-withdrawPayments}.\r\n *\r\n * Requirements:\r\n * - must be in Cancelled state\r\n */\r\n function transferTicketRefundIfCancelled() external {\r\n require(_state == State.Cancelled, \"Must be in Cancelled\");\r\n\r\n uint256 refundAmount = _addressToPurchasedCountMap[msg.sender] * ticketPrice;\r\n if (refundAmount > 0) {\r\n _addressToPurchasedCountMap[msg.sender] = 0;\r\n _asyncTransfer(msg.sender, refundAmount);\r\n }\r\n }\r\n\r\n /**\r\n * @dev Transfers specified NFT to raffle `owner`. This method is used to recover NFT (including other NFTs,\r\n * that could have been transferred to raffle by mistake) if raffle gets cancelled.\r\n *\r\n * Requirements:\r\n * - must be in Cancelled state\r\n */\r\n function transferNFTToOwnerIfCancelled(NFTStandard nftStandard, address contractAddress, uint256 tokenId) external {\r\n require(_state == State.Cancelled, \"Must be in Cancelled\");\r\n\r\n if (nftStandard == NFTStandard.CryptoPunks) {\r\n ICryptoPunk(contractAddress).transferPunk(address(owner()), tokenId);\r\n }\r\n else if (nftStandard == NFTStandard.ERC721) {\r\n IERC721(contractAddress).safeTransferFrom(address(this), owner(), tokenId);\r\n }\r\n else if (nftStandard == NFTStandard.ERC1155) {\r\n IERC1155(contractAddress).safeTransferFrom(address(this), owner(), tokenId, 1, \"\");\r\n }\r\n }\r\n\r\n /**\r\n * @dev Transfers raffle NFT to `_winnerAddress` after the raffle has completed.\r\n *\r\n * Requirements:\r\n * - must be in Completed state\r\n */\r\n function transferNFTToWinnerIfCompleted() external {\r\n require(_state == State.Completed, \"Must be in Completed\");\r\n assert(_winnerAddress != address(0));\r\n\r\n _transferNFTToWinnerTimestamp = block.timestamp;\r\n if (nftStandard == NFTStandard.CryptoPunks) {\r\n ICryptoPunk(nftContract).transferPunk(_winnerAddress, nftTokenId);\r\n }\r\n else if (nftStandard == NFTStandard.ERC721) {\r\n IERC721(nftContract).safeTransferFrom(address(this), _winnerAddress, nftTokenId);\r\n }\r\n else if (nftStandard == NFTStandard.ERC1155) {\r\n IERC1155(nftContract).safeTransferFrom(address(this), _winnerAddress, nftTokenId, 1, \"\");\r\n }\r\n }\r\n\r\n /**\r\n * @dev Transfers raffle ETHinto internal escrow, after that raffle `owner` can claim it\r\n * using {PullPayment-withdrawPayments}.\r\n *\r\n * Requirements:\r\n * - must be in Completed state\r\n */\r\n function transferETHToOwnerIfCompleted() external {\r\n require(_state == State.Completed, \"Must be in Completed\");\r\n\r\n _asyncTransfer(owner(), address(this).balance);\r\n }\r\n\r\n /**\r\n * @dev Returns the number of purchased tickets for given `owner`.\r\n */\r\n function getPurchasedTicketCount(address owner) public view returns (uint16) {\r\n return _addressToPurchasedCountMap[owner];\r\n }\r\n\r\n /**\r\n * @dev Returns raffle state.\r\n *\r\n * If `Completed`, it is possible to use {getWinnerAddress}, {getWinnerDrawTimestamp} and {getWinnerTicketNumber}.\r\n */\r\n function getState() public view returns (State) {\r\n return _state;\r\n }\r\n\r\n function getCancelTimestamp() public view returns (uint256) {\r\n return _cancelTimestamp;\r\n }\r\n\r\n function getTransferNFTToWinnerTimestamp() public view returns (uint256) {\r\n return _transferNFTToWinnerTimestamp;\r\n }\r\n\r\n function getWinnerAddress() public view returns (address) {\r\n return _winnerAddress;\r\n }\r\n\r\n function getWinnerDrawTimestamp() public view returns (uint256) {\r\n return _winnerDrawTimestamp;\r\n }\r\n\r\n function getWinnerTicketNumber() public view returns (uint16) {\r\n return _winnerTicketNumber;\r\n }\r\n\r\n /**\r\n * @dev Chainlink VRF callback function.\r\n *\r\n * Returned `randomWords` are stored in `vrfRandomWords`, we determine winner and store all relevant information in\r\n * `_winnerTicketNumber`, `_winnerDrawTimestamp` and `_winnerAddress`.\r\n *\r\n * Requirements:\r\n * - must have correct `requestId`\r\n * - must be in WaitingForRNG state\r\n *\r\n * Emits a {WinnerDrawn} event.\r\n */\r\n function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords) internal override {\r\n require(vrfRequestId == requestId, \"Unexpected VRF request id\");\r\n require(_state == State.WaitingForRNG, \"Must be in WaitingForRNG\");\r\n\r\n vrfRandomWords = randomWords;\r\n _winnerTicketNumber = uint16(randomWords[0] % _tickets);\r\n _winnerDrawTimestamp = block.timestamp;\r\n _winnerAddress = findOwnerOfTicketNumber(_winnerTicketNumber);\r\n _state = State.Completed;\r\n emit WinnerDrawn(_winnerTicketNumber, _winnerAddress);\r\n }\r\n\r\n /**\r\n * @dev Requests random number from Chainlink VRF. Called when last ticked is sold or given out.\r\n *\r\n * Requirements:\r\n * - must be in WaitingForRNG state\r\n */\r\n function _requestRandomWords() private {\r\n require(_state == State.WaitingForRNG, \"Must be in WaitingForRNG\");\r\n\r\n vrfRequestId = VRF_COORDINATOR.requestRandomWords(\r\n vrfKeyHash,\r\n vrfSubscriptionId,\r\n VRF_REQUEST_CONFIRMATIONS,\r\n VRF_CALLBACK_GAS_LIMIT,\r\n VRF_NUM_WORDS\r\n );\r\n }\r\n}\r\n"
},
"contracts/ICryptoPunk.sol": {
"content": "// SPDX-License-Identifier: MIT\r\npragma solidity ^0.8.9;\r\n\r\n/**\r\n * @dev This contract is used to represent `CryptoPunksMarket` and interact with CryptoPunk NFTs.\r\n */\r\ninterface ICryptoPunk {\r\n function punkIndexToAddress(uint256 punkIndex) external view returns (address);\r\n\r\n function transferPunk(address to, uint256 punkIndex) external;\r\n}\r\n"
},
"contracts/TicketStorage.sol": {
"content": "// SPDX-License-Identifier: MIT\r\npragma solidity ^0.8.9;\r\n\r\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\r\n\r\n/**\r\n * @dev This contract is used to store numbered ticket ranges and their owners.\r\n *\r\n * Ticket range is represented using {TicketNumberRange}, a struct of `owner, `from` and `to`. If account `0x1` buys\r\n * first ticket, then we store it as `(0x1, 0, 0)`, if then account `0x2` buys ten tickets, then we store next record as\r\n * `(0x2, 1, 10)`. If after that third account `0x3` buys ten tickets, we store it as `(0x3, 11, 20)`. And so on.\r\n *\r\n * Storing ticket numbers in such way allows compact representation of accounts who buy a lot of tickets at once.\r\n *\r\n * We set 25000 as limit of how many tickets we can support.\r\n */\r\nabstract contract TicketStorage {\r\n event TicketsAssigned(TicketNumberRange ticketNumberRange, uint16 ticketsLeft);\r\n\r\n struct TicketNumberRange {\r\n address owner;\r\n uint16 from;\r\n uint16 to;\r\n }\r\n\r\n uint16 internal immutable _tickets;\r\n uint16 internal _ticketsLeft;\r\n\r\n TicketNumberRange[] private _ticketNumberRanges;\r\n mapping(address => uint16) private _addressToAssignedCountMap;\r\n mapping(address => uint16[]) private _addressToAssignedTicketNumberRangesMap;\r\n\r\n constructor(uint16 tickets) {\r\n require(tickets > 0, \"Number of tickets must be greater than 0\");\r\n require(tickets <= 25_000, \"Number of tickets cannot exceed 25_000\");\r\n\r\n _tickets = tickets;\r\n _ticketsLeft = tickets;\r\n }\r\n\r\n /**\r\n * @dev Returns total amount of tickets.\r\n */\r\n function getTickets() public view returns (uint16) {\r\n return _tickets;\r\n }\r\n\r\n /**\r\n * @dev Returns amount of unassigned tickets.\r\n */\r\n function getTicketsLeft() public view returns (uint16) {\r\n return _ticketsLeft;\r\n }\r\n\r\n /**\r\n * @dev Returns {TicketNumberRange} for given `index`.\r\n */\r\n function getTicketNumberRange(uint16 index) public view returns (TicketNumberRange memory) {\r\n return _ticketNumberRanges[index];\r\n }\r\n\r\n /**\r\n * @dev Returns how many tickets are assigned to given `owner`.\r\n */\r\n function getAssignedTicketCount(address owner) public view returns (uint16) {\r\n return _addressToAssignedCountMap[owner];\r\n }\r\n\r\n /**\r\n * @dev Returns the index of {TicketNumberRange} in `_ticketNumberRanges` that is assigned to `owner`.\r\n *\r\n * For example, if `owner` purchased tickets three times ({getAssignedTicketNumberRanges} will return `3`),\r\n * we can use this method with `index` of 0, 1 and 2, to get indexes of {TicketNumberRange} in `_ticketNumberRanges`.\r\n */\r\n function getAssignedTicketNumberRange(address owner, uint16 index) public view returns (uint16) {\r\n return _addressToAssignedTicketNumberRangesMap[owner][index];\r\n }\r\n\r\n /**\r\n * @dev Returns how many {TicketNumberRange} are assigned for given `owner`.\r\n *\r\n * Can be used in combination with {getAssignedTicketNumberRange} and {getTicketNumberRange} to show\r\n * all actual ticket numbers that are assigned to the `owner`.\r\n */\r\n function getAssignedTicketNumberRanges(address owner) public view returns (uint16) {\r\n return uint16(_addressToAssignedTicketNumberRangesMap[owner].length);\r\n }\r\n\r\n /**\r\n * @dev Assigns `count` amount of tickets to `owner` address.\r\n *\r\n * Requirements:\r\n * - there must be enough tickets left\r\n *\r\n * Emits a {TicketsAssigned} event.\r\n */\r\n function _assignTickets(address owner, uint16 count) internal {\r\n require(_ticketsLeft > 0, \"All tickets are assigned\");\r\n require(_ticketsLeft >= count, \"Assigning too many tickets at once\");\r\n\r\n uint16 from = _tickets - _ticketsLeft;\r\n _ticketsLeft -= count;\r\n TicketNumberRange memory ticketNumberRange = TicketNumberRange({\r\n owner: owner,\r\n from: from,\r\n to: from + count - 1\r\n });\r\n _ticketNumberRanges.push(ticketNumberRange);\r\n _addressToAssignedCountMap[owner] += count;\r\n _addressToAssignedTicketNumberRangesMap[owner].push(uint16(_ticketNumberRanges.length - 1));\r\n\r\n assert(_ticketNumberRanges[_ticketNumberRanges.length - 1].to == _tickets - _ticketsLeft - 1);\r\n\r\n emit TicketsAssigned(ticketNumberRange, _ticketsLeft);\r\n }\r\n\r\n /**\r\n * @dev Returns address of the `owner` of given ticket number.\r\n *\r\n * Uses binary search on `_ticketNumberRanges` to find it.\r\n *\r\n * Requirements:\r\n * - all tickets must be assigned\r\n */\r\n function findOwnerOfTicketNumber(uint16 ticketNumber) public view returns (address) {\r\n require(ticketNumber < _tickets, \"Ticket number does not exist\");\r\n require(_ticketsLeft == 0, \"Not all tickets are assigned\");\r\n\r\n uint16 ticketNumberRangesLength = uint16(_ticketNumberRanges.length);\r\n assert(_ticketNumberRanges[0].from == 0);\r\n assert(_ticketNumberRanges[ticketNumberRangesLength - 1].to == _tickets - 1);\r\n\r\n uint16 left = 0;\r\n uint16 right = ticketNumberRangesLength - 1;\r\n uint16 pivot = (left + right) / 2;\r\n address ownerAddress = address(0);\r\n while (ownerAddress == address(0)) {\r\n pivot = (left + right) / 2;\r\n TicketNumberRange memory ticketNumberRange = _ticketNumberRanges[pivot];\r\n if (ticketNumberRange.to < ticketNumber) {\r\n left = pivot + 1;\r\n } else if (ticketNumberRange.from > ticketNumber) {\r\n right = pivot - 1;\r\n } else {\r\n ownerAddress = ticketNumberRange.owner;\r\n }\r\n }\r\n\r\n return ownerAddress;\r\n }\r\n}\r\n"
},
"@openzeppelin/contracts/access/Ownable.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../utils/Context.sol\";\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n address private _owner;\n\n event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n /**\n * @dev Initializes the contract setting the deployer as the initial owner.\n */\n constructor() {\n _transferOwnership(_msgSender());\n }\n\n /**\n * @dev Throws if called by any account other than the owner.\n */\n modifier onlyOwner() {\n _checkOwner();\n _;\n }\n\n /**\n * @dev Returns the address of the current owner.\n */\n function owner() public view virtual returns (address) {\n return _owner;\n }\n\n /**\n * @dev Throws if the sender is not the owner.\n */\n function _checkOwner() internal view virtual {\n require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n }\n\n /**\n * @dev Leaves the contract without owner. It will not be possible to call\n * `onlyOwner` functions anymore. Can only be called by the current owner.\n *\n * NOTE: Renouncing ownership will leave the contract without an owner,\n * thereby removing any functionality that is only available to the owner.\n */\n function renounceOwnership() public virtual onlyOwner {\n _transferOwnership(address(0));\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Can only be called by the current owner.\n */\n function transferOwnership(address newOwner) public virtual onlyOwner {\n require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n _transferOwnership(newOwner);\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Internal function without access restriction.\n */\n function _transferOwnership(address newOwner) internal virtual {\n address oldOwner = _owner;\n _owner = newOwner;\n emit OwnershipTransferred(oldOwner, newOwner);\n }\n}\n"
},
"@openzeppelin/contracts/security/PullPayment.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (security/PullPayment.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../utils/escrow/Escrow.sol\";\n\n/**\n * @dev Simple implementation of a\n * https://consensys.github.io/smart-contract-best-practices/recommendations/#favor-pull-over-push-for-external-calls[pull-payment]\n * strategy, where the paying contract doesn't interact directly with the\n * receiver account, which must withdraw its payments itself.\n *\n * Pull-payments are often considered the best practice when it comes to sending\n * Ether, security-wise. It prevents recipients from blocking execution, and\n * eliminates reentrancy concerns.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n *\n * To use, derive from the `PullPayment` contract, and use {_asyncTransfer}\n * instead of Solidity's `transfer` function. Payees can query their due\n * payments with {payments}, and retrieve them with {withdrawPayments}.\n */\nabstract contract PullPayment {\n Escrow private immutable _escrow;\n\n constructor() {\n _escrow = new Escrow();\n }\n\n /**\n * @dev Withdraw accumulated payments, forwarding all gas to the recipient.\n *\n * Note that _any_ account can call this function, not just the `payee`.\n * This means that contracts unaware of the `PullPayment` protocol can still\n * receive funds this way, by having a separate account call\n * {withdrawPayments}.\n *\n * WARNING: Forwarding all gas opens the door to reentrancy vulnerabilities.\n * Make sure you trust the recipient, or are either following the\n * checks-effects-interactions pattern or using {ReentrancyGuard}.\n *\n * @param payee Whose payments will be withdrawn.\n *\n * Causes the `escrow` to emit a {Withdrawn} event.\n */\n function withdrawPayments(address payable payee) public virtual {\n _escrow.withdraw(payee);\n }\n\n /**\n * @dev Returns the payments owed to an address.\n * @param dest The creditor's address.\n */\n function payments(address dest) public view returns (uint256) {\n return _escrow.depositsOf(dest);\n }\n\n /**\n * @dev Called by the payer to store the sent amount as credit to be pulled.\n * Funds sent in this way are stored in an intermediate {Escrow} contract, so\n * there is no danger of them being spent before withdrawal.\n *\n * @param dest The destination address of the funds.\n * @param amount The amount to transfer.\n *\n * Causes the `escrow` to emit a {Deposited} event.\n */\n function _asyncTransfer(address dest, uint256 amount) internal virtual {\n _escrow.deposit{value: amount}(dest);\n }\n}\n"
},
"@chainlink/contracts/src/v0.8/VRFConsumerBaseV2.sol": {
"content": "// SPDX-License-Identifier: MIT\npragma solidity ^0.8.4;\n\n/** ****************************************************************************\n * @notice Interface for contracts using VRF randomness\n * *****************************************************************************\n * @dev PURPOSE\n *\n * @dev Reggie the Random Oracle (not his real job) wants to provide randomness\n * @dev to Vera the verifier in such a way that Vera can be sure he's not\n * @dev making his output up to suit himself. Reggie provides Vera a public key\n * @dev to which he knows the secret key. Each time Vera provides a seed to\n * @dev Reggie, he gives back a value which is computed completely\n * @dev deterministically from the seed and the secret key.\n *\n * @dev Reggie provides a proof by which Vera can verify that the output was\n * @dev correctly computed once Reggie tells it to her, but without that proof,\n * @dev the output is indistinguishable to her from a uniform random sample\n * @dev from the output space.\n *\n * @dev The purpose of this contract is to make it easy for unrelated contracts\n * @dev to talk to Vera the verifier about the work Reggie is doing, to provide\n * @dev simple access to a verifiable source of randomness. It ensures 2 things:\n * @dev 1. The fulfillment came from the VRFCoordinator\n * @dev 2. The consumer contract implements fulfillRandomWords.\n * *****************************************************************************\n * @dev USAGE\n *\n * @dev Calling contracts must inherit from VRFConsumerBase, and can\n * @dev initialize VRFConsumerBase's attributes in their constructor as\n * @dev shown:\n *\n * @dev contract VRFConsumer {\n * @dev constructor(<other arguments>, address _vrfCoordinator, address _link)\n * @dev VRFConsumerBase(_vrfCoordinator) public {\n * @dev <initialization with other arguments goes here>\n * @dev }\n * @dev }\n *\n * @dev The oracle will have given you an ID for the VRF keypair they have\n * @dev committed to (let's call it keyHash). Create subscription, fund it\n * @dev and your consumer contract as a consumer of it (see VRFCoordinatorInterface\n * @dev subscription management functions).\n * @dev Call requestRandomWords(keyHash, subId, minimumRequestConfirmations,\n * @dev callbackGasLimit, numWords),\n * @dev see (VRFCoordinatorInterface for a description of the arguments).\n *\n * @dev Once the VRFCoordinator has received and validated the oracle's response\n * @dev to your request, it will call your contract's fulfillRandomWords method.\n *\n * @dev The randomness argument to fulfillRandomWords is a set of random words\n * @dev generated from your requestId and the blockHash of the request.\n *\n * @dev If your contract could have concurrent requests open, you can use the\n * @dev requestId returned from requestRandomWords to track which response is associated\n * @dev with which randomness request.\n * @dev See \"SECURITY CONSIDERATIONS\" for principles to keep in mind,\n * @dev if your contract could have multiple requests in flight simultaneously.\n *\n * @dev Colliding `requestId`s are cryptographically impossible as long as seeds\n * @dev differ.\n *\n * *****************************************************************************\n * @dev SECURITY CONSIDERATIONS\n *\n * @dev A method with the ability to call your fulfillRandomness method directly\n * @dev could spoof a VRF response with any random value, so it's critical that\n * @dev it cannot be directly called by anything other than this base contract\n * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).\n *\n * @dev For your users to trust that your contract's random behavior is free\n * @dev from malicious interference, it's best if you can write it so that all\n * @dev behaviors implied by a VRF response are executed *during* your\n * @dev fulfillRandomness method. If your contract must store the response (or\n * @dev anything derived from it) and use it later, you must ensure that any\n * @dev user-significant behavior which depends on that stored value cannot be\n * @dev manipulated by a subsequent VRF request.\n *\n * @dev Similarly, both miners and the VRF oracle itself have some influence\n * @dev over the order in which VRF responses appear on the blockchain, so if\n * @dev your contract could have multiple VRF requests in flight simultaneously,\n * @dev you must ensure that the order in which the VRF responses arrive cannot\n * @dev be used to manipulate your contract's user-significant behavior.\n *\n * @dev Since the block hash of the block which contains the requestRandomness\n * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful\n * @dev miner could, in principle, fork the blockchain to evict the block\n * @dev containing the request, forcing the request to be included in a\n * @dev different block with a different hash, and therefore a different input\n * @dev to the VRF. However, such an attack would incur a substantial economic\n * @dev cost. This cost scales with the number of blocks the VRF oracle waits\n * @dev until it calls responds to a request. It is for this reason that\n * @dev that you can signal to an oracle you'd like them to wait longer before\n * @dev responding to the request (however this is not enforced in the contract\n * @dev and so remains effective only in the case of unmodified oracle software).\n */\nabstract contract VRFConsumerBaseV2 {\n error OnlyCoordinatorCanFulfill(address have, address want);\n address private immutable vrfCoordinator;\n\n /**\n * @param _vrfCoordinator address of VRFCoordinator contract\n */\n constructor(address _vrfCoordinator) {\n vrfCoordinator = _vrfCoordinator;\n }\n\n /**\n * @notice fulfillRandomness handles the VRF response. Your contract must\n * @notice implement it. See \"SECURITY CONSIDERATIONS\" above for important\n * @notice principles to keep in mind when implementing your fulfillRandomness\n * @notice method.\n *\n * @dev VRFConsumerBaseV2 expects its subcontracts to have a method with this\n * @dev signature, and will call it once it has verified the proof\n * @dev associated with the randomness. (It is triggered via a call to\n * @dev rawFulfillRandomness, below.)\n *\n * @param requestId The Id initially returned by requestRandomness\n * @param randomWords the VRF output expanded to the requested number of words\n */\n function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords) internal virtual;\n\n // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF\n // proof. rawFulfillRandomness then calls fulfillRandomness, after validating\n // the origin of the call\n function rawFulfillRandomWords(uint256 requestId, uint256[] memory randomWords) external {\n if (msg.sender != vrfCoordinator) {\n revert OnlyCoordinatorCanFulfill(msg.sender, vrfCoordinator);\n }\n fulfillRandomWords(requestId, randomWords);\n }\n}\n"
},
"@openzeppelin/contracts/token/ERC721/IERC721.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../../utils/introspection/IERC165.sol\";\n\n/**\n * @dev Required interface of an ERC721 compliant contract.\n */\ninterface IERC721 is IERC165 {\n /**\n * @dev Emitted when `tokenId` token is transferred from `from` to `to`.\n */\n event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\n\n /**\n * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\n */\n event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\n\n /**\n * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.\n */\n event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\n\n /**\n * @dev Returns the number of tokens in ``owner``'s account.\n */\n function balanceOf(address owner) external view returns (uint256 balance);\n\n /**\n * @dev Returns the owner of the `tokenId` token.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function ownerOf(uint256 tokenId) external view returns (address owner);\n\n /**\n * @dev Safely transfers `tokenId` token from `from` to `to`.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must exist and be owned by `from`.\n * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function safeTransferFrom(\n address from,\n address to,\n uint256 tokenId,\n bytes calldata data\n ) external;\n\n /**\n * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\n * are aware of the ERC721 protocol to prevent tokens from being forever locked.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must exist and be owned by `from`.\n * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function safeTransferFrom(\n address from,\n address to,\n uint256 tokenId\n ) external;\n\n /**\n * @dev Transfers `tokenId` token from `from` to `to`.\n *\n * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must be owned by `from`.\n * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n *\n * Emits a {Transfer} event.\n */\n function transferFrom(\n address from,\n address to,\n uint256 tokenId\n ) external;\n\n /**\n * @dev Gives permission to `to` to transfer `tokenId` token to another account.\n * The approval is cleared when the token is transferred.\n *\n * Only a single account can be approved at a time, so approving the zero address clears previous approvals.\n *\n * Requirements:\n *\n * - The caller must own the token or be an approved operator.\n * - `tokenId` must exist.\n *\n * Emits an {Approval} event.\n */\n function approve(address to, uint256 tokenId) external;\n\n /**\n * @dev Approve or remove `operator` as an operator for the caller.\n * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.\n *\n * Requirements:\n *\n * - The `operator` cannot be the caller.\n *\n * Emits an {ApprovalForAll} event.\n */\n function setApprovalForAll(address operator, bool _approved) external;\n\n /**\n * @dev Returns the account approved for `tokenId` token.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function getApproved(uint256 tokenId) external view returns (address operator);\n\n /**\n * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.\n *\n * See {setApprovalForAll}\n */\n function isApprovedForAll(address owner, address operator) external view returns (bool);\n}\n"
},
"@openzeppelin/contracts/token/ERC1155/IERC1155.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/IERC1155.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../../utils/introspection/IERC165.sol\";\n\n/**\n * @dev Required interface of an ERC1155 compliant contract, as defined in the\n * https://eips.ethereum.org/EIPS/eip-1155[EIP].\n *\n * _Available since v3.1._\n */\ninterface IERC1155 is IERC165 {\n /**\n * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.\n */\n event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);\n\n /**\n * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all\n * transfers.\n */\n event TransferBatch(\n address indexed operator,\n address indexed from,\n address indexed to,\n uint256[] ids,\n uint256[] values\n );\n\n /**\n * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to\n * `approved`.\n */\n event ApprovalForAll(address indexed account, address indexed operator, bool approved);\n\n /**\n * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.\n *\n * If an {URI} event was emitted for `id`, the standard\n * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value\n * returned by {IERC1155MetadataURI-uri}.\n */\n event URI(string value, uint256 indexed id);\n\n /**\n * @dev Returns the amount of tokens of token type `id` owned by `account`.\n *\n * Requirements:\n *\n * - `account` cannot be the zero address.\n */\n function balanceOf(address account, uint256 id) external view returns (uint256);\n\n /**\n * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.\n *\n * Requirements:\n *\n * - `accounts` and `ids` must have the same length.\n */\n function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)\n external\n view\n returns (uint256[] memory);\n\n /**\n * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,\n *\n * Emits an {ApprovalForAll} event.\n *\n * Requirements:\n *\n * - `operator` cannot be the caller.\n */\n function setApprovalForAll(address operator, bool approved) external;\n\n /**\n * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.\n *\n * See {setApprovalForAll}.\n */\n function isApprovedForAll(address account, address operator) external view returns (bool);\n\n /**\n * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.\n *\n * Emits a {TransferSingle} event.\n *\n * Requirements:\n *\n * - `to` cannot be the zero address.\n * - If the caller is not `from`, it must have been approved to spend ``from``'s tokens via {setApprovalForAll}.\n * - `from` must have a balance of tokens of type `id` of at least `amount`.\n * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the\n * acceptance magic value.\n */\n function safeTransferFrom(\n address from,\n address to,\n uint256 id,\n uint256 amount,\n bytes calldata data\n ) external;\n\n /**\n * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.\n *\n * Emits a {TransferBatch} event.\n *\n * Requirements:\n *\n * - `ids` and `amounts` must have the same length.\n * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the\n * acceptance magic value.\n */\n function safeBatchTransferFrom(\n address from,\n address to,\n uint256[] calldata ids,\n uint256[] calldata amounts,\n bytes calldata data\n ) external;\n}\n"
},
"@chainlink/contracts/src/v0.8/interfaces/VRFCoordinatorV2Interface.sol": {
"content": "// SPDX-License-Identifier: MIT\npragma solidity ^0.8.0;\n\ninterface VRFCoordinatorV2Interface {\n /**\n * @notice Get configuration relevant for making requests\n * @return minimumRequestConfirmations global min for request confirmations\n * @return maxGasLimit global max for request gas limit\n * @return s_provingKeyHashes list of registered key hashes\n */\n function getRequestConfig()\n external\n view\n returns (\n uint16,\n uint32,\n bytes32[] memory\n );\n\n /**\n * @notice Request a set of random words.\n * @param keyHash - Corresponds to a particular oracle job which uses\n * that key for generating the VRF proof. Different keyHash's have different gas price\n * ceilings, so you can select a specific one to bound your maximum per request cost.\n * @param subId - The ID of the VRF subscription. Must be funded\n * with the minimum subscription balance required for the selected keyHash.\n * @param minimumRequestConfirmations - How many blocks you'd like the\n * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS\n * for why you may want to request more. The acceptable range is\n * [minimumRequestBlockConfirmations, 200].\n * @param callbackGasLimit - How much gas you'd like to receive in your\n * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords\n * may be slightly less than this amount because of gas used calling the function\n * (argument decoding etc.), so you may need to request slightly more than you expect\n * to have inside fulfillRandomWords. The acceptable range is\n * [0, maxGasLimit]\n * @param numWords - The number of uint256 random values you'd like to receive\n * in your fulfillRandomWords callback. Note these numbers are expanded in a\n * secure way by the VRFCoordinator from a single random value supplied by the oracle.\n * @return requestId - A unique identifier of the request. Can be used to match\n * a request to a response in fulfillRandomWords.\n */\n function requestRandomWords(\n bytes32 keyHash,\n uint64 subId,\n uint16 minimumRequestConfirmations,\n uint32 callbackGasLimit,\n uint32 numWords\n ) external returns (uint256 requestId);\n\n /**\n * @notice Create a VRF subscription.\n * @return subId - A unique subscription id.\n * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.\n * @dev Note to fund the subscription, use transferAndCall. For example\n * @dev LINKTOKEN.transferAndCall(\n * @dev address(COORDINATOR),\n * @dev amount,\n * @dev abi.encode(subId));\n */\n function createSubscription() external returns (uint64 subId);\n\n /**\n * @notice Get a VRF subscription.\n * @param subId - ID of the subscription\n * @return balance - LINK balance of the subscription in juels.\n * @return reqCount - number of requests for this subscription, determines fee tier.\n * @return owner - owner of the subscription.\n * @return consumers - list of consumer address which are able to use this subscription.\n */\n function getSubscription(uint64 subId)\n external\n view\n returns (\n uint96 balance,\n uint64 reqCount,\n address owner,\n address[] memory consumers\n );\n\n /**\n * @notice Request subscription owner transfer.\n * @param subId - ID of the subscription\n * @param newOwner - proposed new owner of the subscription\n */\n function requestSubscriptionOwnerTransfer(uint64 subId, address newOwner) external;\n\n /**\n * @notice Request subscription owner transfer.\n * @param subId - ID of the subscription\n * @dev will revert if original owner of subId has\n * not requested that msg.sender become the new owner.\n */\n function acceptSubscriptionOwnerTransfer(uint64 subId) external;\n\n /**\n * @notice Add a consumer to a VRF subscription.\n * @param subId - ID of the subscription\n * @param consumer - New consumer which can use the subscription\n */\n function addConsumer(uint64 subId, address consumer) external;\n\n /**\n * @notice Remove a consumer from a VRF subscription.\n * @param subId - ID of the subscription\n * @param consumer - Consumer to remove from the subscription\n */\n function removeConsumer(uint64 subId, address consumer) external;\n\n /**\n * @notice Cancel a subscription\n * @param subId - ID of the subscription\n * @param to - Where to send the remaining LINK to\n */\n function cancelSubscription(uint64 subId, address to) external;\n\n /*\n * @notice Check to see if there exists a request commitment consumers\n * for all consumers and keyhashes for a given sub.\n * @param subId - ID of the subscription\n * @return true if there exists at least one unfulfilled request for the subscription, false\n * otherwise.\n */\n function pendingRequestExists(uint64 subId) external view returns (bool);\n}\n"
},
"@openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/utils/ERC1155Holder.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./ERC1155Receiver.sol\";\n\n/**\n * Simple implementation of `ERC1155Receiver` that will allow a contract to hold ERC1155 tokens.\n *\n * IMPORTANT: When inheriting this contract, you must include a way to use the received tokens, otherwise they will be\n * stuck.\n *\n * @dev _Available since v3.1._\n */\ncontract ERC1155Holder is ERC1155Receiver {\n function onERC1155Received(\n address,\n address,\n uint256,\n uint256,\n bytes memory\n ) public virtual override returns (bytes4) {\n return this.onERC1155Received.selector;\n }\n\n function onERC1155BatchReceived(\n address,\n address,\n uint256[] memory,\n uint256[] memory,\n bytes memory\n ) public virtual override returns (bytes4) {\n return this.onERC1155BatchReceived.selector;\n }\n}\n"
},
"@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/utils/ERC721Holder.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../IERC721Receiver.sol\";\n\n/**\n * @dev Implementation of the {IERC721Receiver} interface.\n *\n * Accepts all token transfers.\n * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.\n */\ncontract ERC721Holder is IERC721Receiver {\n /**\n * @dev See {IERC721Receiver-onERC721Received}.\n *\n * Always returns `IERC721Receiver.onERC721Received.selector`.\n */\n function onERC721Received(\n address,\n address,\n uint256,\n bytes memory\n ) public virtual override returns (bytes4) {\n return this.onERC721Received.selector;\n }\n}\n"
},
"@openzeppelin/contracts/utils/Context.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n function _msgSender() internal view virtual returns (address) {\n return msg.sender;\n }\n\n function _msgData() internal view virtual returns (bytes calldata) {\n return msg.data;\n }\n}\n"
},
"@openzeppelin/contracts/utils/escrow/Escrow.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (utils/escrow/Escrow.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../../access/Ownable.sol\";\nimport \"../Address.sol\";\n\n/**\n * @title Escrow\n * @dev Base escrow contract, holds funds designated for a payee until they\n * withdraw them.\n *\n * Intended usage: This contract (and derived escrow contracts) should be a\n * standalone contract, that only interacts with the contract that instantiated\n * it. That way, it is guaranteed that all Ether will be handled according to\n * the `Escrow` rules, and there is no need to check for payable functions or\n * transfers in the inheritance tree. The contract that uses the escrow as its\n * payment method should be its owner, and provide public methods redirecting\n * to the escrow's deposit and withdraw.\n */\ncontract Escrow is Ownable {\n using Address for address payable;\n\n event Deposited(address indexed payee, uint256 weiAmount);\n event Withdrawn(address indexed payee, uint256 weiAmount);\n\n mapping(address => uint256) private _deposits;\n\n function depositsOf(address payee) public view returns (uint256) {\n return _deposits[payee];\n }\n\n /**\n * @dev Stores the sent amount as credit to be withdrawn.\n * @param payee The destination address of the funds.\n *\n * Emits a {Deposited} event.\n */\n function deposit(address payee) public payable virtual onlyOwner {\n uint256 amount = msg.value;\n _deposits[payee] += amount;\n emit Deposited(payee, amount);\n }\n\n /**\n * @dev Withdraw accumulated balance for a payee, forwarding all gas to the\n * recipient.\n *\n * WARNING: Forwarding all gas opens the door to reentrancy vulnerabilities.\n * Make sure you trust the recipient, or are either following the\n * checks-effects-interactions pattern or using {ReentrancyGuard}.\n *\n * @param payee The address whose funds will be withdrawn and transferred to.\n *\n * Emits a {Withdrawn} event.\n */\n function withdraw(address payable payee) public virtual onlyOwner {\n uint256 payment = _deposits[payee];\n\n _deposits[payee] = 0;\n\n payee.sendValue(payment);\n\n emit Withdrawn(payee, payment);\n }\n}\n"
},
"@openzeppelin/contracts/utils/Address.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)\n\npragma solidity ^0.8.1;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n /**\n * @dev Returns true if `account` is a contract.\n *\n * [IMPORTANT]\n * ====\n * It is unsafe to assume that an address for which this function returns\n * false is an externally-owned account (EOA) and not a contract.\n *\n * Among others, `isContract` will return false for the following\n * types of addresses:\n *\n * - an externally-owned account\n * - a contract in construction\n * - an address where a contract will be created\n * - an address where a contract lived, but was destroyed\n * ====\n *\n * [IMPORTANT]\n * ====\n * You shouldn't rely on `isContract` to protect against flash loan attacks!\n *\n * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets\n * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract\n * constructor.\n * ====\n */\n function isContract(address account) internal view returns (bool) {\n // This method relies on extcodesize/address.code.length, which returns 0\n // for contracts in construction, since the code is only stored at the end\n // of the constructor execution.\n\n return account.code.length > 0;\n }\n\n /**\n * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n * `recipient`, forwarding all available gas and reverting on errors.\n *\n * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n * of certain opcodes, possibly making contracts go over the 2300 gas limit\n * imposed by `transfer`, making them unable to receive funds via\n * `transfer`. {sendValue} removes this limitation.\n *\n * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n *\n * IMPORTANT: because control is transferred to `recipient`, care must be\n * taken to not create reentrancy vulnerabilities. Consider using\n * {ReentrancyGuard} or the\n * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n */\n function sendValue(address payable recipient, uint256 amount) internal {\n require(address(this).balance >= amount, \"Address: insufficient balance\");\n\n (bool success, ) = recipient.call{value: amount}(\"\");\n require(success, \"Address: unable to send value, recipient may have reverted\");\n }\n\n /**\n * @dev Performs a Solidity function call using a low level `call`. A\n * plain `call` is an unsafe replacement for a function call: use this\n * function instead.\n *\n * If `target` reverts with a revert reason, it is bubbled up by this\n * function (like regular Solidity function calls).\n *\n * Returns the raw returned data. To convert to the expected return value,\n * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n *\n * Requirements:\n *\n * - `target` must be a contract.\n * - calling `target` with `data` must not revert.\n *\n * _Available since v3.1._\n */\n function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n return functionCall(target, data, \"Address: low-level call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n * `errorMessage` as a fallback revert reason when `target` reverts.\n *\n * _Available since v3.1._\n */\n function functionCall(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal returns (bytes memory) {\n return functionCallWithValue(target, data, 0, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but also transferring `value` wei to `target`.\n *\n * Requirements:\n *\n * - the calling contract must have an ETH balance of at least `value`.\n * - the called Solidity function must be `payable`.\n *\n * _Available since v3.1._\n */\n function functionCallWithValue(\n address target,\n bytes memory data,\n uint256 value\n ) internal returns (bytes memory) {\n return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n * with `errorMessage` as a fallback revert reason when `target` reverts.\n *\n * _Available since v3.1._\n */\n function functionCallWithValue(\n address target,\n bytes memory data,\n uint256 value,\n string memory errorMessage\n ) internal returns (bytes memory) {\n require(address(this).balance >= value, \"Address: insufficient balance for call\");\n require(isContract(target), \"Address: call to non-contract\");\n\n (bool success, bytes memory returndata) = target.call{value: value}(data);\n return verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but performing a static call.\n *\n * _Available since v3.3._\n */\n function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n return functionStaticCall(target, data, \"Address: low-level static call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n * but performing a static call.\n *\n * _Available since v3.3._\n */\n function functionStaticCall(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal view returns (bytes memory) {\n require(isContract(target), \"Address: static call to non-contract\");\n\n (bool success, bytes memory returndata) = target.staticcall(data);\n return verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but performing a delegate call.\n *\n * _Available since v3.4._\n */\n function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n * but performing a delegate call.\n *\n * _Available since v3.4._\n */\n function functionDelegateCall(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal returns (bytes memory) {\n require(isContract(target), \"Address: delegate call to non-contract\");\n\n (bool success, bytes memory returndata) = target.delegatecall(data);\n return verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the\n * revert reason using the provided one.\n *\n * _Available since v4.3._\n */\n function verifyCallResult(\n bool success,\n bytes memory returndata,\n string memory errorMessage\n ) internal pure returns (bytes memory) {\n if (success) {\n return returndata;\n } else {\n // Look for revert reason and bubble it up if present\n if (returndata.length > 0) {\n // The easiest way to bubble the revert reason is using memory via assembly\n /// @solidity memory-safe-assembly\n assembly {\n let returndata_size := mload(returndata)\n revert(add(32, returndata), returndata_size)\n }\n } else {\n revert(errorMessage);\n }\n }\n }\n}\n"
},
"@openzeppelin/contracts/utils/introspection/IERC165.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC165 standard, as defined in the\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\n *\n * Implementers can declare support of contract interfaces, which can then be\n * queried by others ({ERC165Checker}).\n *\n * For an implementation, see {ERC165}.\n */\ninterface IERC165 {\n /**\n * @dev Returns true if this contract implements the interface defined by\n * `interfaceId`. See the corresponding\n * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]\n * to learn more about how these ids are created.\n *\n * This function call must use less than 30 000 gas.\n */\n function supportsInterface(bytes4 interfaceId) external view returns (bool);\n}\n"
},
"@openzeppelin/contracts/token/ERC1155/utils/ERC1155Receiver.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC1155/utils/ERC1155Receiver.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../IERC1155Receiver.sol\";\nimport \"../../../utils/introspection/ERC165.sol\";\n\n/**\n * @dev _Available since v3.1._\n */\nabstract contract ERC1155Receiver is ERC165, IERC1155Receiver {\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {\n return interfaceId == type(IERC1155Receiver).interfaceId || super.supportsInterface(interfaceId);\n }\n}\n"
},
"@openzeppelin/contracts/utils/introspection/ERC165.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./IERC165.sol\";\n\n/**\n * @dev Implementation of the {IERC165} interface.\n *\n * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check\n * for the additional interface id that will be supported. For example:\n *\n * ```solidity\n * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);\n * }\n * ```\n *\n * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.\n */\nabstract contract ERC165 is IERC165 {\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n return interfaceId == type(IERC165).interfaceId;\n }\n}\n"
},
"@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../../utils/introspection/IERC165.sol\";\n\n/**\n * @dev _Available since v3.1._\n */\ninterface IERC1155Receiver is IERC165 {\n /**\n * @dev Handles the receipt of a single ERC1155 token type. This function is\n * called at the end of a `safeTransferFrom` after the balance has been updated.\n *\n * NOTE: To accept the transfer, this must return\n * `bytes4(keccak256(\"onERC1155Received(address,address,uint256,uint256,bytes)\"))`\n * (i.e. 0xf23a6e61, or its own function selector).\n *\n * @param operator The address which initiated the transfer (i.e. msg.sender)\n * @param from The address which previously owned the token\n * @param id The ID of the token being transferred\n * @param value The amount of tokens being transferred\n * @param data Additional data with no specified format\n * @return `bytes4(keccak256(\"onERC1155Received(address,address,uint256,uint256,bytes)\"))` if transfer is allowed\n */\n function onERC1155Received(\n address operator,\n address from,\n uint256 id,\n uint256 value,\n bytes calldata data\n ) external returns (bytes4);\n\n /**\n * @dev Handles the receipt of a multiple ERC1155 token types. This function\n * is called at the end of a `safeBatchTransferFrom` after the balances have\n * been updated.\n *\n * NOTE: To accept the transfer(s), this must return\n * `bytes4(keccak256(\"onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)\"))`\n * (i.e. 0xbc197c81, or its own function selector).\n *\n * @param operator The address which initiated the batch transfer (i.e. msg.sender)\n * @param from The address which previously owned the token\n * @param ids An array containing ids of each token being transferred (order and length must match values array)\n * @param values An array containing amounts of each token being transferred (order and length must match ids array)\n * @param data Additional data with no specified format\n * @return `bytes4(keccak256(\"onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)\"))` if transfer is allowed\n */\n function onERC1155BatchReceived(\n address operator,\n address from,\n uint256[] calldata ids,\n uint256[] calldata values,\n bytes calldata data\n ) external returns (bytes4);\n}\n"
},
"@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @title ERC721 token receiver interface\n * @dev Interface for any contract that wants to support safeTransfers\n * from ERC721 asset contracts.\n */\ninterface IERC721Receiver {\n /**\n * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}\n * by `operator` from `from`, this function is called.\n *\n * It must return its Solidity selector to confirm the token transfer.\n * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.\n *\n * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.\n */\n function onERC721Received(\n address operator,\n address from,\n uint256 tokenId,\n bytes calldata data\n ) external returns (bytes4);\n}\n"
}
},
"settings": {
"optimizer": {
"enabled": true,
"runs": 200
},
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"libraries": {}
}
}