ERC-721
Overview
Max Total Supply
0 FOF
Holders
101
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
11 FOFLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
FountainOfFortune
Compiler Version
v0.8.4+commit.c7e474f2
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
//SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./Standards/ERC721/ERC721.sol"; import "./Interfaces/IFountainOfFortune.sol"; import "./Interfaces/IWETH.sol"; import "./Utils/Counters.sol"; import "./Chainlink/VRFConsumerBase.sol"; /** * @title Fountain Of Fortune * @author Myobu Devs */ contract FountainOfFortune is VRFConsumerBase( 0xf0d54349aDdcf704F77AE15b96510dEA15cb7952, 0x514910771AF9Ca656af840dff83E8264EcF986CA ), IFountainOfFortune, ERC721("Fountain of Fortune", "FOF") { /// @dev Using counters for lottery ID's using Counters for Counters.Counter; /** * @dev * _myobu: The Myobu token contract * _WETH: The WETH contract used to wrap ETH * _chainlinkKeyHash: The chainlink key hash * _chainlinkFee: The amount of link to pay for random numbers * _feeReceiver: Where all the ticket sale fees will be sent to * _tokenID: Used to mint NFTs, increases for each NFT minted * _lastClaimedTokenID: Used to store the last tokenID that fees were claimed for * _rewardClaimed: Used to store if the reward has been claimed for the current lottery, resets per lottery * _inClaimReward: Used to store if its waiting for an oracle response, so claimReward() can't be called multiple times * and waste all the LINK in the contract * _lotteryID: A counter of how much lotteries there have been, increases by 1 each new lottery * _lottery: A mapping of Lottery ID => The lottery struct that stores information * _ticketsBought: A mapping of Address => Lottery ID => Amount of tickets bought */ IERC20 private _myobu; // solhint-disable-next-line IWETH private _WETH; bytes32 private _chainlinkKeyHash; uint256 private _chainlinkFee; address private _feeReceiver; uint256 private _tokenID; uint256 private _lastClaimedTokenID; bool private _rewardClaimed; bool private _inClaimReward; Counters.Counter private _lotteryID; mapping(uint256 => Lottery) private _lottery; mapping(address => mapping(uint256 => uint256)) private _ticketsBought; /** * @dev Modifier that requires that there is no lottery ongoing (ended) */ modifier onlyEnded { require( _lottery[_lotteryID.current()].endTimestamp <= block.timestamp, "FoF: Lottery needs to have ended for this" ); _; } /** * @dev Modifier that requires that there is a lottery in progress (on) */ modifier onlyOn { require( _lottery[_lotteryID.current()].endTimestamp > block.timestamp, "FoF: No lottery is on right now" ); _; } /** * @dev Defines the Myobu and WETH token contracts, the chainlink fee and keyhash */ constructor() { _myobu = IERC20(0x75D12E4F91Df721faFCae4c6cD1d5280381370AC); _feeReceiver = address(0xdD5FD50DcB8Db2B41357f8E655b941A04b566Cb5); _WETH = IWETH(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2); _chainlinkKeyHash = 0xAA77729D3466CA35AE8D28B3BBAC7CC36A5031EFDC430821C02BC31A238AF445; _chainlinkFee = 2e18; /// @dev So the owner can be able to start the lottery _rewardClaimed = true; /// @dev Start ID's at 1 _tokenID = 1; _lastClaimedTokenID = 1; } /** * @dev Attempt to transfer ETH, if failed wrap the ETH and send WETH. So that the * transfer always succeeds * @param to: The address to send ETH to * @param amount: The amount to send */ function transferOrWrapETH(address to, uint256 amount) internal { // solhint-disable-next-line if (!payable(to).send(amount)) { _WETH.deposit{value: amount}(); _WETH.transfer(to, amount); } } /** * @dev Make the lottery tickets untransferable * So that nobody makes a new address, buys myobu and then sends the tickets to another address * And then sells the myobu. And if he wins the lottery, it won't count it. * * While it could transfer the ticketsBought, that would make it so anyone can buy tickets, and * send to someone else. And then if the person that it was sent to wins from their * old lottery tickets, they wouldn't get the reward because not enough myobu to cover * the new tickets that they have been sent */ function _beforeTokenTransfer( address from, address to, uint256 ) internal pure override { /// @dev Only mint or burn is allowed require( from == address(0) || to == address(0), "FoF: Cannot transfer tickets" ); } /** * @return The amount of myobu that someone needs to hold to buy lottery tickets * @param user: The address * @param amount: The amount of tickets */ function myobuNeededForTickets(address user, uint256 amount) public view override returns (uint256) { uint256 minimumMyobuBalance = _lottery[_lotteryID.current()] .minimumMyobuBalance; uint256 myobuNeededForEachTicket = _lottery[_lotteryID.current()] .myobuNeededForEachTicket; uint256 ticketsBought_ = _ticketsBought[user][_lotteryID.current()]; uint256 totalTickets = (ticketsBought_ + amount) - 1; uint256 _myobuNeededForTickets = totalTickets * myobuNeededForEachTicket; return minimumMyobuBalance + _myobuNeededForTickets; } /** * @dev Buys tickets with ETH, requires that he has at least (myobuNeededForTickets()) myobu, * and then loops over how much tickets he needs and mints the ERC721 tokens * If there is too much ETH sent, refund unneeded ETH * Emits TicketsBought() */ function buyTickets() external payable override onlyOn { uint256 ticketPrice = _lottery[_lotteryID.current()].ticketPrice; uint256 amountOfTickets = msg.value / ticketPrice; require(amountOfTickets != 0, "FoF: Not enough ETH"); require( _myobu.balanceOf(_msgSender()) >= myobuNeededForTickets(_msgSender(), amountOfTickets), "FoF: You don't have enough $MYOBU" ); uint256 neededETH = amountOfTickets * ticketPrice; /// @dev Refund unneeded eth if (msg.value > neededETH) { transferOrWrapETH(_msgSender(), msg.value - neededETH); } uint256 tokenID_ = _tokenID; _tokenID += amountOfTickets; _ticketsBought[_msgSender()][_lotteryID.current()] += amountOfTickets; for (uint256 i = tokenID_; i < amountOfTickets + tokenID_; i++) { _mint(_msgSender(), i); } emit TicketsBought(_msgSender(), amountOfTickets, ticketPrice); } /** * @dev Function to calculate how much fees that will be taken * @return The amount of fees that will be taken * @param currentTokenID: The latest tokenID * @param ticketPrice: The price of 1 ticket * @param ticketFee: The percentage of the ticket to take as a fee * @param lastClaimedTokenID_: The last token ID that fees have been claimed for */ function calculateFees( uint256 currentTokenID, uint256 ticketPrice, uint256 ticketFee, uint256 lastClaimedTokenID_ ) public pure override returns (uint256) { uint256 unclaimedTicketSales = currentTokenID - lastClaimedTokenID_; return ((unclaimedTicketSales * ticketPrice) * ticketFee) / 10000; } /** * @return The amount of unclaimed fees, can be claimed using claimFees() */ function unclaimedFees() public view override returns (uint256) { return calculateFees( _tokenID, _lottery[_lotteryID.current()].ticketPrice, _lottery[_lotteryID.current()].ticketFee, _lastClaimedTokenID ); } /** * @return The amount of fees taken for the current lottery */ function claimedFees() public view override returns (uint256) { return calculateFees( _lastClaimedTokenID, _lottery[_lotteryID.current()].ticketPrice, _lottery[_lotteryID.current()].ticketFee, _lottery[_lotteryID.current()].startingTokenID ); } /** * @dev Function that claims fees, saves gas so that its doesn't happen per ticket buy. * Emits FeesClaimed() */ function claimFees() public override { uint256 fee = unclaimedFees(); _lastClaimedTokenID = _tokenID; transferOrWrapETH(_feeReceiver, fee); emit FeesClaimed(fee, _msgSender()); } /** * @dev Function that distributes the reward, requests for randomness, completes at fulfillRandomness() * If nobody bought a ticket, makes rewardsClaimed true and returns nothing * Checks for _inClaimReward so that its not called more than once, wasting LINK. */ function claimReward() external override onlyEnded returns (bytes32 requestId) { require(!_rewardClaimed, "FoF: Reward already claimed"); require(!_inClaimReward, "FoF: Reward is being claimed"); /// @dev So it doesn't fail if nobody bought any tickets if (_lottery[_lotteryID.current()].startingTokenID == _tokenID) { _rewardClaimed = true; return 0; } require( LINK.balanceOf(address(this)) >= _chainlinkFee, "FoF: Put some LINK into the contract" ); _inClaimReward = true; return requestRandomness(_chainlinkKeyHash, _chainlinkFee); } /** * @dev Gets a winner and sends him the jackpot, if he doesn't have myobu at the time of winning * send the _feeReceiver the jackpot * Emits LotteryWon(); */ function fulfillRandomness(bytes32, uint256 randomness) internal override { /// @dev Get a random number in range of the token IDs uint256 x = _lottery[_lotteryID.current()].startingTokenID; uint256 y = _tokenID; /// @dev The winning token ID uint256 resultInRange = x + (randomness % (y - x)); address winner = ownerOf(resultInRange); uint256 amountWon = jackpot(); uint256 myobuNeeded = myobuNeededForTickets(winner, 0); if (_myobu.balanceOf(winner) < myobuNeeded) { /// @dev He sold his myobu, give the jackpot to the fee receiver and deduct based on the percentage to keep uint256 amountToKeepForNextLottery = (amountWon * _lottery[_lotteryID.current()] .percentageToKeepOnNotEnoughMyobu) / 10000; amountWon -= amountToKeepForNextLottery; winner = _feeReceiver; } transferOrWrapETH(winner, amountWon); _rewardClaimed = true; delete _inClaimReward; emit LotteryWon(winner, amountWon, resultInRange); } /** * @dev Starts a new lottery, Can only be done by the owner. * Emits LotteryCreated() * @param lotteryLength: How long the lottery will be in seconds * @param ticketPrice: The price of a ticket in ETH * @param ticketFee: The percentage of the ticket price that is sent to the fee receiver * @param percentageToKeepForNextLottery: The percentage that will be kept as reward for the lottery after * @param minimumMyobuBalance: The minimum amount of myobu someone needs to buy tickets or get the reward * @param myobuNeededForEachTicket: The amount of myobu that someone needs to hold for each ticket they buy * @param percentageToKeepOnNotEnoughMyobu: If someone doesn't have myobu at the time of winning, this will define the * percentage of the reward that will be kept in the contract for the next lottery */ function createLottery( uint256 lotteryLength, uint256 ticketPrice, uint256 ticketFee, uint256 percentageToKeepForNextLottery, uint256 minimumMyobuBalance, uint256 myobuNeededForEachTicket, uint256 percentageToKeepOnNotEnoughMyobu ) external onlyOwner onlyEnded { /// @dev Cannot execute it now, must be executed seperately require( _rewardClaimed, "FoF: Claim the reward before starting a new lottery" ); require( percentageToKeepForNextLottery + ticketFee < 10000, "FoF: You can not take everything or more as a fee" ); require( lotteryLength <= 2629744, "FoF: Must be under or equal to 1 month" ); /// @dev Check if fees haven't been claimed, if they haven't claim them if (unclaimedFees() != 0) { claimFees(); } /// @dev For the new lottery _lotteryID.increment(); uint256 newLotteryID = _lotteryID.current(); _lottery[newLotteryID] = Lottery( _tokenID, block.timestamp, block.timestamp + lotteryLength, ticketPrice, ticketFee, minimumMyobuBalance, percentageToKeepForNextLottery, myobuNeededForEachTicket, percentageToKeepOnNotEnoughMyobu ); delete _rewardClaimed; emit LotteryCreated( newLotteryID, lotteryLength, ticketPrice, ticketFee, minimumMyobuBalance, percentageToKeepForNextLottery, myobuNeededForEachTicket, percentageToKeepOnNotEnoughMyobu ); } /** * @dev Returns the amount of tokens to keep for the next lottery */ function toNextLottery() public view override returns (uint256) { uint256 percentageToKeepForNextLottery = _lottery[_lotteryID.current()] .percentageToKeepForNextLottery; uint256 totalFees = claimedFees(); return ((address(this).balance + totalFees) * percentageToKeepForNextLottery) / 10000; } /** * @return The current jackpot * @dev Balance - The percentage for the next lottery - Unclaimed Fees */ function jackpot() public view override returns (uint256) { uint256 balance = address(this).balance; uint256 _unclaimedFees = unclaimedFees(); uint256 amountToKeepForNextLottery = toNextLottery(); return balance - amountToKeepForNextLottery - _unclaimedFees; } /** * @dev Function so that anyone can contribute to the jackpot when there is a lottery ongoing */ // solhint-disable-next-line receive() external payable onlyOn {} /// @dev Getter functions : Start /** * @return The Myobu Token */ function myobu() external view override returns (IERC20) { return _myobu; } /** * @return The amount of link to pay for a VRF call */ function chainlinkFee() external view override returns (uint256) { return _chainlinkFee; } /** * @return Where all the ticket fees will be sent to */ function feeReceiver() external view override returns (address) { return _feeReceiver; } /** * @return The current lottery ID */ function currentLotteryID() external view override returns (uint256) { return _lotteryID.current(); } /** * @dev The current token ID */ function tokenID() external view override returns (uint256) { return _tokenID; } /** * @return The info of a lottery (A struct) * See the Lottery struct for more info * @param lotteryID: The ID of the lottery to get info for */ function lottery(uint256 lotteryID) external view override returns (Lottery memory) { return _lottery[lotteryID]; } /** * @return Returns if the reward has been claimed, can only be viewed when there is no * lottery in progress or will return false. */ function rewardClaimed() external view override onlyEnded returns (bool) { return _rewardClaimed; } /** * @return The last token ID fees have been claimed on for the current lottery */ function lastClaimedTokenID() external view override returns (uint256) { return _lastClaimedTokenID; } /** * @return The amount of tickets someone bought * @param user: The address * @param lotteryID: The ID of the lottery */ function ticketsBought(address user, uint256 lotteryID) external view override returns (uint256) { return _ticketsBought[user][lotteryID]; } /// @dev Getter functions : End /** * @dev If there is unneeded LINK in the contract, the owner can recover them using this function */ function recoverLINK(uint256 amount) external onlyOwner { LINK.transfer(_msgSender(), amount); } /// @dev Optional functions, commented out by default /** * @dev In case the Myobu token gets changed later on, the owner can call this to change it * @param newMyobu: The new myobu token contract function setMyobu(IERC20 newMyobu) external onlyOwner { _myobu = newMyobu; } */ /** * @dev Sets the address that receives all the fees * @param newFeeReceiver: The new address that will recieve all the fees function setFeeReceiver(address newFeeReceiver) external onlyOwner { _feeReceiver = newFeeReceiver; } */ /** * @dev Changes the chainlink VRF oracle fee in case it needs to be changed later on * @param newChainlinkFee: The new amount of LINK to pay for a VRF Oracle call */ function setChainlinkFee(uint256 newChainlinkFee) external onlyOwner { _chainlinkFee = newChainlinkFee; } /** * @dev Extends the duration of the current lottery and checks if its the new duration is over 1 month, reverts if it is * @param extraTime: The time in seconds to extend it by */ function extendCurrentLottery(uint256 extraTime) external onlyOwner onlyOn { uint256 currentLotteryEnd = _lottery[_lotteryID.current()].endTimestamp; uint256 currentLotteryStart = _lottery[_lotteryID.current()] .startTimestamp; require( currentLotteryEnd + extraTime <= currentLotteryStart + 2629744, "FoF: Must be under or equal to 1 month" ); _lottery[_lotteryID.current()].endTimestamp += extraTime; } }
// 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 constuctor(<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 constant private 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 immutable internal LINK; address immutable private vrfCoordinator; // Nonces for each VRF key from which randomness has been requested. // // Must stay in sync with VRFCoordinator[_keyHash][this] mapping(bytes32 /* keyHash */ => uint256 /* 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 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 pragma solidity ^0.8.0; import "./IERC20.sol"; interface IWETH is IERC20 { function deposit() external payable; function withdraw(uint256 amount) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC20.sol"; import "../Chainlink/interfaces/LinkTokenInterface.sol"; /** * @title Myobu Lottery Interface * @author Myobu Devs */ interface IFountainOfFortune { /** * @dev Event emmited when tickets are bought * @param buyer: The address of the buyer * @param amount: The amount of tickets bought * @param price: The price of each ticket * */ event TicketsBought(address buyer, uint256 amount, uint256 price); /** * @dev Event emmited when fees are claimed * @param amountClaimed: The amount of fees claimed in ETH * @param claimer: The address that claimed the fees */ event FeesClaimed(uint256 amountClaimed, address claimer); /** * @dev Event emmited when a lottery is created * @param lotteryID: The ID of the lottery created * @param lotteryLength: How long the lottery will be in seconds * @param ticketPrice: The price of a ticket in ETH * @param ticketFee: The percentage of the ticket price that is sent to the fee receiver * @param minimumMyobuBalance: The minimum amount of Myobu someone needs to buy tickets or get rewarded * @param percentageToKeepForNextLottery: The percentage that will be kept as reward for the next lottery * @param myobuNeededForEachTicket: The amount of myobu that someone needs to hold for each ticket they buy * @param percentageToKeepOnNotEnoughMyobu: If someone doesn't have myobu at the time of winning, this will define the * percentage of the reward that will be kept in the contract for the next lottery */ event LotteryCreated( uint256 lotteryID, uint256 lotteryLength, uint256 ticketPrice, uint256 ticketFee, uint256 minimumMyobuBalance, uint256 percentageToKeepForNextLottery, uint256 myobuNeededForEachTicket, uint256 percentageToKeepOnNotEnoughMyobu ); /** * @dev Event emmited when the someone wins the lottery * @param winner: The address of the the lottery winner * @param amountWon: The amount of ETH won * @param tokenID: The winning tokenID */ event LotteryWon(address winner, uint256 amountWon, uint256 tokenID); /** * @dev Event emitted when the lottery is extended * @param extendedBy: The amount of seconds the lottery is extended by */ event LotteryExtended(uint256 extendedBy); /** * @dev Struct of a lottery * @param startingTokenID: The token ID that the lottery starts at * @param startTimestamp: A timestamp of when the lottery started * @param endTimestamp: A timestamp of when the lottery will end * @param ticketPrice: The price of a ticket in ETH * @param ticketFee: The percentage of ticket sales that go to the _feeReceiver * @param minimumMyobuBalance: The minimum amount of myobu you need to buy tickets * @param percentageToKeepForNextLottery: The percentage of the jackpot to keep for the next lottery * @param myobuNeededForEachTicket: The amount of myobu that someone needs to hold for each ticket they buy * @param percentageToKeepOnNotEnoughMyobu: If someone doesn't have myobu at the time of winning, this will define the * percentage of the reward that will be kept in the contract for the next lottery */ struct Lottery { uint256 startingTokenID; uint256 startTimestamp; uint256 endTimestamp; uint256 ticketPrice; uint256 ticketFee; uint256 minimumMyobuBalance; uint256 percentageToKeepForNextLottery; uint256 myobuNeededForEachTicket; uint256 percentageToKeepOnNotEnoughMyobu; } /** * @dev Buys lottery tickets with ETH */ function buyTickets() external payable; function ticketsBought(address user, uint256 lotteryID) external view returns (uint256); /** * @return The amount of unclaimed fees, can be claimed using claimFees() */ function unclaimedFees() external view returns (uint256); /** * @return The amount of fees claimed for the current lottery */ function claimedFees() external view returns (uint256); /** * @dev Function to calculate the fees that will be taken * @return The amount of fees that will be taken * @param currentTokenID: The latest tokenID * @param ticketPrice: The price of 1 ticket * @param ticketFee: The percentage of the ticket to take as a fee * @param lastClaimedTokenID_: The last token ID that fees have been claimed for */ function calculateFees( uint256 currentTokenID, uint256 ticketPrice, uint256 ticketFee, uint256 lastClaimedTokenID_ ) external pure returns (uint256); /** * @dev Function that claims fees and sends to _feeReceiver. */ function claimFees() external; /** * @return The amount of myobu that someone needs to hold to buy lottery tickets * @param user: The address * @param amount: The amount of tickets */ function myobuNeededForTickets(address user, uint256 amount) external view returns (uint256); /** * @dev Function that gets a random winner and sends the reward */ function claimReward() external returns (bytes32 requestId); /** * @dev Returns the amount of tokens to keep for the next lottery */ function toNextLottery() external view returns (uint256); /** * @return The current jackpot */ function jackpot() external view returns (uint256); /** * @return The current token being used */ function myobu() external view returns (IERC20); /** * @return The amount of link to pay */ function chainlinkFee() external view returns (uint256); /** * @return Where all the ticket sale fees will be sent to */ function feeReceiver() external view returns (address); /** * @return A counter of how much lotteries there have been, increases by 1 each new lottery. */ function currentLotteryID() external view returns (uint256); /** * @return The current token ID */ function tokenID() external view returns (uint256); /** * @return The info of a lottery (The Lottery Struct) */ function lottery(uint256 lotteryID) external view returns (Lottery memory); /** * @return Returns if the reward has been claimed for the current lottery */ function rewardClaimed() external view returns (bool); /** * @return The last tokenID that fees have been claimed on for the current lottery */ function lastClaimedTokenID() external view returns (uint256); }
// SPDX-License-Identifier: MIT /// @dev Same openzeppelin contract but imported ownable here pragma solidity ^0.8.0; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "./extensions/IERC721Metadata.sol"; import "../../Utils/Address.sol"; import "../../Utils/Ownable.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}. */ abstract contract ERC721 is Ownable, 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 { require(operator != _msgSender(), "ERC721: approve to caller"); _operatorApprovals[_msgSender()][operator] = approved; emit ApprovalForAll(_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); } /** * @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); } /** * @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 of token that is not own"); 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); } /** * @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 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(to).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 {} }
// SPDX-License-Identifier: MIT 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 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 pragma solidity ^0.8.0; import "./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() { _setOwner(_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 { _setOwner(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"); _setOwner(newOwner); } function _setOwner(address newOwner) private { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @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 * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 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); } function _verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) private 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 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 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; 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 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 `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, 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; 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; 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; /** * @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 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; } }
{ "optimizer": { "enabled": false, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
Contract Security Audit
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:[],"name":"currentLotteryID","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"extraTime","type":"uint256"}],"name":"extendCurrentLottery","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"feeReceiver","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"jackpot","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastClaimedTokenID","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"lotteryID","type":"uint256"}],"name":"lottery","outputs":[{"components":[{"internalType":"uint256","name":"startingTokenID","type":"uint256"},{"internalType":"uint256","name":"startTimestamp","type":"uint256"},{"internalType":"uint256","name":"endTimestamp","type":"uint256"},{"internalType":"uint256","name":"ticketPrice","type":"uint256"},{"internalType":"uint256","name":"ticketFee","type":"uint256"},{"internalType":"uint256","name":"minimumMyobuBalance","type":"uint256"},{"internalType":"uint256","name":"percentageToKeepForNextLottery","type":"uint256"},{"internalType":"uint256","name":"myobuNeededForEachTicket","type":"uint256"},{"internalType":"uint256","name":"percentageToKeepOnNotEnoughMyobu","type":"uint256"}],"internalType":"struct IFountainOfFortune.Lottery","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"myobu","outputs":[{"internalType":"contract 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Contract Creation Code
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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.