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{
"language": "Solidity",
"sources": {
"@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"
},
"@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/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/ReentrancyGuard.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\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 */\nabstract contract ReentrancyGuard {\n // Booleans are more expensive than uint256 or any type that takes up a full\n // word because each write operation emits an extra SLOAD to first read the\n // slot's contents, replace the bits taken up by the boolean, and then write\n // back. This is the compiler's defense against contract upgrades and\n // pointer aliasing, and it cannot be disabled.\n\n // The values being non-zero value makes deployment a bit more expensive,\n // but in exchange the refund on every call to nonReentrant will be lower in\n // amount. Since refunds are capped to a percentage of the total\n // transaction's gas, it is best to keep them low in cases like this one, to\n // increase the likelihood of the full refund coming into effect.\n uint256 private constant _NOT_ENTERED = 1;\n uint256 private constant _ENTERED = 2;\n\n uint256 private _status;\n\n constructor() {\n _status = _NOT_ENTERED;\n }\n\n /**\n * @dev Prevents a contract from calling itself, directly or indirectly.\n * Calling a `nonReentrant` function from another `nonReentrant`\n * function is not supported. It is possible to prevent this from happening\n * by making the `nonReentrant` function external, and making it call a\n * `private` function that does the actual work.\n */\n modifier nonReentrant() {\n _nonReentrantBefore();\n _;\n _nonReentrantAfter();\n }\n\n function _nonReentrantBefore() private {\n // On the first call to nonReentrant, _status will be _NOT_ENTERED\n require(_status != _ENTERED, \"ReentrancyGuard: reentrant call\");\n\n // Any calls to nonReentrant after this point will fail\n _status = _ENTERED;\n }\n\n function _nonReentrantAfter() private {\n // By storing the original value once again, a refund is triggered (see\n // https://eips.ethereum.org/EIPS/eip-2200)\n _status = _NOT_ENTERED;\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"
},
"src/backend/contracts/Lottery.sol": {
"content": "// SPDX-License-Identifier: MIT\r\npragma solidity ^0.8.4;\r\n\r\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\r\nimport \"@openzeppelin/contracts/security/ReentrancyGuard.sol\";\r\nimport \"@chainlink/contracts/src/v0.8/interfaces/VRFCoordinatorV2Interface.sol\";\r\nimport \"@chainlink/contracts/src/v0.8/VRFConsumerBaseV2.sol\";\r\n\r\ncontract Lottery is Ownable, ReentrancyGuard, VRFConsumerBaseV2 {\r\n // bytes32 keyHash = 0x79d3d8832d904592c0bf9818b621522c988bb8b0c05cdc3b15aea1b6e8db0c15; // goerli\r\n bytes32 keyHash = 0x8af398995b04c28e9951adb9721ef74c74f93e6a478f39e7e0777be13527e7ef; // mainnet\r\n uint64 s_subscriptionId;\r\n VRFCoordinatorV2Interface COORDINATOR;\r\n uint32 callbackGasLimit = 200000;\r\n uint16 requestConfirmations = 3;\r\n uint32 numWords = 1;\r\n uint256[] public s_randomWords;\r\n uint256 public s_requestId;\r\n\r\n uint256 public entryPrice = 0.005 ether;\r\n uint256 public totalSupply = 100;\r\n uint256 public remainingSupply = 100;\r\n address[] betsQueue;\r\n mapping(address => uint256) public rewardsPerAddress;\r\n\r\n uint256[] rewardWeights;\r\n\r\n event BetStarted(\r\n address user\r\n );\r\n\r\n event BetSettled(\r\n address user,\r\n uint256 result\r\n );\r\n\r\n constructor(address _vrfCoordinator, uint64 subscriptionId) VRFConsumerBaseV2(_vrfCoordinator) {\r\n // Initialize Chainlink Coordinator\r\n COORDINATOR = VRFCoordinatorV2Interface(_vrfCoordinator);\r\n s_subscriptionId = subscriptionId;\r\n\r\n rewardWeights.push(1);\r\n rewardWeights.push(6);\r\n rewardWeights.push(20);\r\n }\r\n\r\n function buyTicket() payable public nonReentrant {\r\n require(remainingSupply > 0, \"No remaining tickets.\");\r\n require(msg.value >= entryPrice, \"Not enough ETH sent; check price!\");\r\n require(rewardsPerAddress[msg.sender] == 0, \"You can only participate once to the lottery.\");\r\n\r\n betsQueue.push(msg.sender);\r\n s_requestId = COORDINATOR.requestRandomWords(\r\n keyHash,\r\n s_subscriptionId,\r\n requestConfirmations,\r\n callbackGasLimit,\r\n numWords\r\n );\r\n \r\n emit BetStarted(msg.sender);\r\n }\r\n\r\n // Callback function when random number from Chainlink is generated\r\n function fulfillRandomWords(\r\n uint256, /* requestId */\r\n uint256[] memory randomWords\r\n ) internal override {\r\n s_randomWords = randomWords;\r\n \r\n uint256 betsQueueLength = betsQueue.length;\r\n require(betsQueueLength > 0, \"No bets in queue\");\r\n\r\n // Here we take the last bet in queue and handle it\r\n address lastBet = betsQueue[betsQueueLength - 1];\r\n require(rewardsPerAddress[lastBet] == 0, \"You can only participate once to the lottery.\");\r\n require(remainingSupply > 0, \"No remaining tickets.\");\r\n remainingSupply --;\r\n\r\n uint256 _random100 = s_randomWords[0] % 100;\r\n uint256 _result;\r\n\r\n if (_random100 < rewardWeights[0]) {\r\n _result = 1;\r\n } else if (_random100 < rewardWeights[1]) {\r\n _result = 2;\r\n } else if (_random100 < rewardWeights[2]) {\r\n _result = 3;\r\n } else {\r\n _result = 4;\r\n }\r\n rewardsPerAddress[lastBet] = _result;\r\n\r\n emit BetSettled(lastBet, _result);\r\n betsQueue.pop();\r\n }\r\n\r\n function startLottery(uint256 _totalSupply) public onlyOwner {\r\n totalSupply = _totalSupply;\r\n remainingSupply = _totalSupply;\r\n }\r\n\r\n function setRewardWeight(uint256 _index, uint256 _weight) public onlyOwner {\r\n require(_index < rewardWeights.length, \"Reward weight index out of bound\");\r\n rewardWeights[_index] = _weight;\r\n }\r\n\r\n function setEntryPrice(uint256 _entryPrice) public onlyOwner {\r\n entryPrice = _entryPrice;\r\n }\r\n \r\n function withdraw() public onlyOwner {\r\n payable(msg.sender).transfer(address(this).balance);\r\n }\r\n}\r\n"
}
},
"settings": {
"optimizer": {
"enabled": false,
"runs": 200
},
"outputSelection": {
"*": {
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} |