ERC-721
NFT
Overview
Max Total Supply
7,500 FBL
Holders
1,011
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
69 FBLLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
Furballs
Compiler Version
v0.8.7+commit.e28d00a7
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.6; // import "hardhat/console.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; import "@openzeppelin/contracts/utils/Counters.sol"; import "./editions/IFurballEdition.sol"; import "./engines/ILootEngine.sol"; import "./engines/EngineA.sol"; import "./utils/FurLib.sol"; import "./utils/FurDefs.sol"; import "./utils/FurProxy.sol"; import "./utils/Moderated.sol"; import "./utils/Governance.sol"; import "./Fur.sol"; import "./Furgreement.sol"; // import "hardhat/console.sol"; /// @title Furballs /// @author LFG Gaming LLC /// @notice Mints Furballs on the Ethereum blockchain /// @dev https://furballs.com/contract contract Furballs is ERC721Enumerable, Moderated { Fur public fur; IFurballEdition[] public editions; ILootEngine public engine; Governance public governance; Furgreement public furgreement; // tokenId => furball data mapping(uint256 => FurLib.Furball) public furballs; // tokenId => all rewards assigned to that Furball mapping(uint256 => FurLib.Rewards) public collect; // The amount of time over which FUR/EXP is accrued (usually 3600=>1hour); used with test servers uint256 public intervalDuration; // When play/collect runs, returns rewards event Collection(uint256 tokenId, uint256 responseId); // Inventory change event event Inventory(uint256 tokenId, uint128 lootId, uint16 dropped); constructor(uint256 interval) ERC721("Furballs", "FBL") { intervalDuration = interval; } // ----------------------------------------------------------------------------------------------- // Public transactions // ----------------------------------------------------------------------------------------------- /// @notice Mints a new furball from the current edition (if there are any remaining) /// @dev Limits and fees are set by IFurballEdition function mint(address[] memory to, uint8 editionIndex, address actor) external { (address sender, uint8 permissions) = _approvedSender(actor); require(to.length == 1 || permissions >= FurLib.PERMISSION_MODERATOR, "MULT"); for (uint8 i=0; i<to.length; i++) { fur.purchaseMint(sender, permissions, to[i], editions[editionIndex]); _spawn(to[i], editionIndex, 0); } } /// @notice Feeds the furball a snack /// @dev Delegates logic to fur function feed(FurLib.Feeding[] memory feedings, address actor) external { (address sender, uint8 permissions) = _approvedSender(actor); uint256 len = feedings.length; for (uint256 i=0; i<len; i++) { fur.purchaseSnack(sender, permissions, feedings[i].tokenId, feedings[i].snackId, feedings[i].count); } } /// @notice Begins exploration mode with the given furballs /// @dev Multiple furballs accepted at once to reduce gas fees /// @param tokenIds The furballs which should start exploring /// @param zone The explore zone (otherwize, zero for battle mode) function playMany(uint256[] memory tokenIds, uint32 zone, address actor) external { (address sender, uint8 permissions) = _approvedSender(actor); for (uint256 i=0; i<tokenIds.length; i++) { // Run reward collection _collect(tokenIds[i], sender, permissions); // Set new zone (if allowed; enterZone may throw) furballs[tokenIds[i]].zone = uint32(engine.enterZone(tokenIds[i], zone, tokenIds)); } } /// @notice Re-dropping loot allows players to pay $FUR to re-roll an inventory slot /// @param tokenId The furball in question /// @param lootId The lootId in its inventory to re-roll function upgrade( uint256 tokenId, uint128 lootId, uint8 chances, address actor ) external { // Attempt upgrade (random chance). (address sender, uint8 permissions) = _approvedSender(actor); uint128 up = fur.purchaseUpgrade(_baseModifiers(tokenId), sender, permissions, tokenId, lootId, chances); if (up != 0) { _drop(tokenId, lootId, 1); _pickup(tokenId, up); } } /// @notice The LootEngine can directly send loot to a furball! /// @dev This allows for gameplay expansion, i.e., new game modes /// @param tokenId The furball to gain the loot /// @param lootId The loot ID being sent function pickup(uint256 tokenId, uint128 lootId) external gameAdmin { _pickup(tokenId, lootId); } /// @notice The LootEngine can cause a furball to drop loot! /// @dev This allows for gameplay expansion, i.e., new game modes /// @param tokenId The furball /// @param lootId The item to drop /// @param count the number of that item to drop function drop(uint256 tokenId, uint128 lootId, uint8 count) external gameAdmin { _drop(tokenId, lootId, count); } // ----------------------------------------------------------------------------------------------- // Internal // ----------------------------------------------------------------------------------------------- function _slotNum(uint256 tokenId, uint128 lootId) internal view returns(uint256) { for (uint8 i=0; i<furballs[tokenId].inventory.length; i++) { if (furballs[tokenId].inventory[i] / 256 == lootId) { return i + 1; } } return 0; } /// @notice Remove an inventory item from a furball function _drop(uint256 tokenId, uint128 lootId, uint8 count) internal { uint256 slot = _slotNum(tokenId, lootId); require(slot > 0 && slot <= uint32(furballs[tokenId].inventory.length), "SLOT"); slot -= 1; uint8 stackSize = uint8(furballs[tokenId].inventory[slot] % 0x100); if (count == 0 || count >= stackSize) { // Drop entire stack uint16 len = uint16(furballs[tokenId].inventory.length); if (len > 1) { furballs[tokenId].inventory[slot] = furballs[tokenId].inventory[len - 1]; } furballs[tokenId].inventory.pop(); count = stackSize; } else { stackSize -= count; furballs[tokenId].inventory[slot] = uint256(lootId) * 0x100 + stackSize; } furballs[tokenId].weight -= count * engine.weightOf(lootId); emit Inventory(tokenId, lootId, count); } /// @notice Internal implementation of adding a single known loot item to a Furball function _pickup(uint256 tokenId, uint128 lootId) internal { require(lootId > 0, "LOOT"); uint256 slotNum = _slotNum(tokenId, lootId); uint8 stackSize = 1; if (slotNum == 0) { furballs[tokenId].inventory.push(uint256(lootId) * 0x100 + stackSize); } else { stackSize += uint8(furballs[tokenId].inventory[slotNum - 1] % 0x100); require(stackSize < 0x100, "STACK"); furballs[tokenId].inventory[slotNum - 1] = uint256(lootId) * 0x100 + stackSize; } furballs[tokenId].weight += engine.weightOf(lootId); emit Inventory(tokenId, lootId, 0); } /// @notice Calculates full reward modifier stack for a furball in a zone. function _rewardModifiers( FurLib.Furball memory fb, uint256 tokenId, address ownerContext, uint256 snackData ) internal view returns(FurLib.RewardModifiers memory reward) { uint16 energy = uint16(FurLib.extractBytes(snackData, FurLib.SNACK_BYTE_ENERGY, 2)); uint16 happiness = uint16(FurLib.extractBytes(snackData, FurLib.SNACK_BYTE_HAPPINESS, 2)); bool context = ownerContext != address(0); uint32 editionIndex = uint32(tokenId % 0x100); reward = FurLib.RewardModifiers( uint16(100 + fb.rarity), uint16(100 + fb.rarity - (editionIndex < 4 ? (editionIndex * 20) : 80)), uint16(100), happiness, energy, context ? fb.zone : 0 ); // Engine will consider inventory and team size in zone (17k) return engine.modifyReward( fb, editions[editionIndex].modifyReward(reward, tokenId), governance.getAccount(ownerContext), context ); } /// @notice Common version of _rewardModifiers which excludes contextual data function _baseModifiers(uint256 tokenId) internal view returns(FurLib.RewardModifiers memory) { return _rewardModifiers(furballs[tokenId], tokenId, address(0), 0); } /// @notice Ends the current explore/battle and dispenses rewards /// @param tokenId The furball function _collect(uint256 tokenId, address sender, uint8 permissions) internal { FurLib.Furball memory furball = furballs[tokenId]; address owner = ownerOf(tokenId); // The engine is allowed to force furballs into exploration mode // This allows it to end a battle early, which will be necessary in PvP require(owner == sender || permissions >= FurLib.PERMISSION_ADMIN, "OWN"); // Scale duration to the time the edition has been live if (furball.last == 0) { uint64 launchedAt = uint64(editions[tokenId % 0x100].liveAt()); require(launchedAt > 0 && launchedAt < uint64(block.timestamp), "PRE"); furball.last = furball.birth > launchedAt ? furball.birth : launchedAt; } // Calculate modifiers to be used with this collection FurLib.RewardModifiers memory mods = _rewardModifiers(furball, tokenId, owner, fur.cleanSnacks(tokenId)); // Reset the collection for this furball uint32 duration = uint32(uint64(block.timestamp) - furball.last); collect[tokenId].fur = 0; collect[tokenId].experience = 0; collect[tokenId].levels = 0; if (mods.zone >= 0x10000) { // Battle zones earn FUR and assign to the owner uint32 f = uint32(_calculateReward(duration, FurLib.FUR_PER_INTERVAL, mods.furPercent)); if (f > 0) { fur.earn(owner, f); collect[tokenId].fur = f; } } else { // Explore zones earn EXP... uint32 exp = uint32(_calculateReward(duration, FurLib.EXP_PER_INTERVAL, mods.expPercent)); (uint32 totalExp, uint16 levels) = engine.onExperience(furballs[tokenId], owner, exp); collect[tokenId].experience = exp; collect[tokenId].levels = levels; furballs[tokenId].level += levels; furballs[tokenId].experience = totalExp; } // Generate loot and assign to furball uint32 interval = uint32(intervalDuration); uint128 lootId = engine.dropLoot(duration / interval, mods); collect[tokenId].loot = lootId; if (lootId > 0) { _pickup(tokenId, lootId); } // Timestamp the last interaction for next cycle. furballs[tokenId].last = uint64(block.timestamp); // Emit the reward ID for frontend uint32 moves = furball.moves + 1; furballs[tokenId].moves = moves; emit Collection(tokenId, moves); } /// @notice Mints a new furball /// @dev Recursive function; generates randomization seed for the edition /// @param to The recipient of the furball /// @param nonce A recursive counter to prevent infinite loops function _spawn(address to, uint8 editionIndex, uint8 nonce) internal { require(nonce < 10, "SUPPLY"); require(editionIndex < editions.length, "ED"); IFurballEdition edition = editions[editionIndex]; // Generate a random furball tokenId; if it fails to be unique, recurse! (uint256 tokenId, uint16 rarity) = edition.spawn(); tokenId += editionIndex; if (_exists(tokenId)) return _spawn(to, editionIndex, nonce + 1); // Ensure that this wallet has not exceeded its per-edition mint-cap uint32 owned = edition.minted(to); require(owned < edition.maxMintable(to), "LIMIT"); // Check the current edition's constraints (caller should have checked costs) uint16 cnt = edition.count(); require(cnt < edition.maxCount(), "MAX"); // Initialize the memory struct that represents the furball furballs[tokenId].number = uint32(totalSupply() + 1); furballs[tokenId].count = cnt; furballs[tokenId].rarity = rarity; furballs[tokenId].birth = uint64(block.timestamp); // Finally, mint the token and increment internal counters _mint(to, tokenId); edition.addCount(to, 1); } /// @notice Happens each time a furball changes wallets /// @dev Keeps track of the furball timestamp function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal override { super._beforeTokenTransfer(from, to, tokenId); // Update internal data states furballs[tokenId].trade = uint64(block.timestamp); // Delegate other logic to the engine engine.onTrade(furballs[tokenId], from, to); } // ----------------------------------------------------------------------------------------------- // Game Engine & Moderation // ----------------------------------------------------------------------------------------------- function stats(uint256 tokenId, bool contextual) public view returns(FurLib.FurballStats memory) { // Base stats are calculated without team size so this doesn't effect public metadata FurLib.Furball memory furball = furballs[tokenId]; FurLib.RewardModifiers memory mods = _rewardModifiers( furball, tokenId, contextual ? ownerOf(tokenId) : address(0), contextual ? fur.snackEffects(tokenId) : 0 ); return FurLib.FurballStats( uint16(_calculateReward(intervalDuration, FurLib.EXP_PER_INTERVAL, mods.expPercent)), uint16(_calculateReward(intervalDuration, FurLib.FUR_PER_INTERVAL, mods.furPercent)), mods, furball, fur.snacks(tokenId) ); } /// @notice This utility function is useful because it force-casts arguments to uint256 function _calculateReward( uint256 duration, uint256 perInterval, uint256 percentBoost ) internal view returns(uint256) { uint256 interval = intervalDuration; return (duration * percentBoost * perInterval) / (100 * interval); } // ----------------------------------------------------------------------------------------------- // Public Views/Accessors (for outside world) // ----------------------------------------------------------------------------------------------- /// @notice Provides the OpenSea storefront /// @dev see https://docs.opensea.io/docs/contract-level-metadata function contractURI() public view returns (string memory) { return governance.metaURI(); } /// @notice Provides the on-chain Furball asset /// @dev see https://docs.opensea.io/docs/metadata-standards function tokenURI(uint256 tokenId) public view override returns (string memory) { require(_exists(tokenId)); return string(abi.encodePacked("data:application/json;base64,", FurLib.encode(abi.encodePacked( editions[tokenId % 0x100].tokenMetadata( engine.attributesMetadata(tokenId), tokenId, furballs[tokenId].number ) )))); } // ----------------------------------------------------------------------------------------------- // OpenSea Proxy // ----------------------------------------------------------------------------------------------- /// @notice Whitelisting the proxy registies for secondary market transactions /// @dev See OpenSea ERC721Tradable function isApprovedForAll(address owner, address operator) override public view returns (bool) { return engine.canProxyTrades(owner, operator) || super.isApprovedForAll(owner, operator); } /// @notice This is used instead of msg.sender as transactions won't be sent by the original token owner, but by OpenSea. /// @dev See OpenSea ContentMixin function _msgSender() internal override view returns (address sender) { if (msg.sender == address(this)) { bytes memory array = msg.data; uint256 index = msg.data.length; assembly { // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those. sender := and( mload(add(array, index)), 0xffffffffffffffffffffffffffffffffffffffff ) } } else { sender = msg.sender; } return sender; } // ----------------------------------------------------------------------------------------------- // Configuration / Admin // ----------------------------------------------------------------------------------------------- function setFur(address furAddress) external onlyAdmin { fur = Fur(furAddress); } function setFurgreement(address furgAddress) external onlyAdmin { furgreement = Furgreement(furgAddress); } function setGovernance(address addr) public onlyAdmin { governance = Governance(payable(addr)); } function setEngine(address addr) public onlyAdmin { engine = ILootEngine(addr); } function addEdition(address addr, uint8 idx) public onlyAdmin { if (idx >= editions.length) { editions.push(IFurballEdition(addr)); } else { editions[idx] = IFurballEdition(addr); } } function _isReady() internal view returns(bool) { return address(engine) != address(0) && editions.length > 0 && address(fur) != address(0) && address(governance) != address(0); } /// @notice Handles auth of msg.sender against cheating and/or banning. /// @dev Pass nonzero sender to act as a proxy against the furgreement function _approvedSender(address sender) internal view returns (address, uint8) { // No sender (for gameplay) is approved until the necessary parts are online require(_isReady(), "!RDY"); if (sender != address(0) && sender != msg.sender) { // Only the furgreement may request a proxied sender. require(msg.sender == address(furgreement), "PROXY"); } else { // Zero input triggers sender calculation from msg args sender = _msgSender(); } // All senders are validated thru engine logic. uint8 permissions = uint8(engine.approveSender(sender)); // Zero-permissions indicate unauthorized. require(permissions > 0, "PLR"); return (sender, permissions); } modifier gameAdmin() { (address sender, uint8 permissions) = _approvedSender(address(0)); require(permissions >= FurLib.PERMISSION_ADMIN, "GAME"); _; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../ERC721.sol"; import "./IERC721Enumerable.sol"; /** * @dev This implements an optional extension of {ERC721} defined in the EIP that adds * enumerability of all the token ids in the contract as well as all token ids owned by each * account. */ abstract contract ERC721Enumerable is ERC721, IERC721Enumerable { // Mapping from owner to list of owned token IDs mapping(address => mapping(uint256 => uint256)) private _ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) private _ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] private _allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) private _allTokensIndex; /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) { return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}. */ function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) { require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds"); return _ownedTokens[owner][index]; } /** * @dev See {IERC721Enumerable-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _allTokens.length; } /** * @dev See {IERC721Enumerable-tokenByIndex}. */ function tokenByIndex(uint256 index) public view virtual override returns (uint256) { require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds"); return _allTokens[index]; } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` cannot be the zero address. * - `to` cannot be the zero address. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual override { super._beforeTokenTransfer(from, to, tokenId); if (from == address(0)) { _addTokenToAllTokensEnumeration(tokenId); } else if (from != to) { _removeTokenFromOwnerEnumeration(from, tokenId); } if (to == address(0)) { _removeTokenFromAllTokensEnumeration(tokenId); } else if (to != from) { _addTokenToOwnerEnumeration(to, tokenId); } } /** * @dev Private function to add a token to this extension's ownership-tracking data structures. * @param to address representing the new owner of the given token ID * @param tokenId uint256 ID of the token to be added to the tokens list of the given address */ function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { uint256 length = ERC721.balanceOf(to); _ownedTokens[to][length] = tokenId; _ownedTokensIndex[tokenId] = length; } /** * @dev Private function to add a token to this extension's token tracking data structures. * @param tokenId uint256 ID of the token to be added to the tokens list */ function _addTokenToAllTokensEnumeration(uint256 tokenId) private { _allTokensIndex[tokenId] = _allTokens.length; _allTokens.push(tokenId); } /** * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for * gas optimizations e.g. when performing a transfer operation (avoiding double writes). * This has O(1) time complexity, but alters the order of the _ownedTokens array. * @param from address representing the previous owner of the given token ID * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private { // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = ERC721.balanceOf(from) - 1; uint256 tokenIndex = _ownedTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary if (tokenIndex != lastTokenIndex) { uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index } // This also deletes the contents at the last position of the array delete _ownedTokensIndex[tokenId]; delete _ownedTokens[from][lastTokenIndex]; } /** * @dev Private function to remove a token from this extension's token tracking data structures. * This has O(1) time complexity, but alters the order of the _allTokens array. * @param tokenId uint256 ID of the token to be removed from the tokens list */ function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = _allTokens.length - 1; uint256 tokenIndex = _allTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding // an 'if' statement (like in _removeTokenFromOwnerEnumeration) uint256 lastTokenId = _allTokens[lastTokenIndex]; _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index // This also deletes the contents at the last position of the array delete _allTokensIndex[tokenId]; _allTokens.pop(); } }
// SPDX-License-Identifier: MIT 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: UNLICENSED pragma solidity ^0.8.6; import "../utils/FurLib.sol"; import "@openzeppelin/contracts/utils/introspection/IERC165.sol"; /// @title IFurballEdition /// @author LFG Gaming LLC /// @notice Interface for a single edition within Furballs interface IFurballEdition is IERC165 { function index() external view returns(uint8); function count() external view returns(uint16); function maxCount() external view returns (uint16); // total max count in this edition function addCount(address to, uint16 amount) external returns(bool); function liveAt() external view returns(uint64); function minted(address addr) external view returns(uint16); function maxMintable(address addr) external view returns(uint16); function maxAdoptable() external view returns (uint16); // how many can be adopted, out of the max? function purchaseFur() external view returns(uint256); // amount of FUR for buying function spawn() external returns (uint256, uint16); /// @notice Calculates the effects of the loot in a Furball's inventory function modifyReward( FurLib.RewardModifiers memory modifiers, uint256 tokenId ) external view returns(FurLib.RewardModifiers memory); /// @notice Renders a JSON object for tokenURI function tokenMetadata( bytes memory attributes, uint256 tokenId, uint256 number ) external view returns(bytes memory); }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.6; import "@openzeppelin/contracts/utils/introspection/IERC165.sol"; import "../editions/IFurballEdition.sol"; import "../utils/FurLib.sol"; /// @title ILootEngine /// @author LFG Gaming LLC /// @notice The loot engine is patchable by replacing the Furballs' engine with a new version interface ILootEngine is IERC165 { /// @notice When a Furball comes back from exploration, potentially give it some loot. function dropLoot(uint32 intervals, FurLib.RewardModifiers memory mods) external returns(uint128); /// @notice Players can pay to re-roll their loot drop on a Furball function upgradeLoot( FurLib.RewardModifiers memory modifiers, address owner, uint128 lootId, uint8 chances ) external returns(uint128); /// @notice Some zones may have preconditions function enterZone(uint256 tokenId, uint32 zone, uint256[] memory team) external returns(uint256); /// @notice Calculates the effects of the loot in a Furball's inventory function modifyReward( FurLib.Furball memory furball, FurLib.RewardModifiers memory baseModifiers, FurLib.Account memory account, bool contextual ) external view returns(FurLib.RewardModifiers memory); /// @notice Loot can have different weight to help prevent over-powering a furball function weightOf(uint128 lootId) external pure returns (uint16); /// @notice JSON object for displaying metadata on OpenSea, etc. function attributesMetadata(uint256 tokenId) external view returns(bytes memory); /// @notice Get a potential snack for the furball by its ID function getSnack(uint32 snack) external view returns(FurLib.Snack memory); /// @notice Proxy registries are allowed to act as 3rd party trading platforms function canProxyTrades(address owner, address operator) external view returns(bool); /// @notice Authorization mechanics are upgradeable to account for security patches function approveSender(address sender) external view returns(uint); /// @notice Called when a Furball is traded to update delegate logic function onTrade( FurLib.Furball memory furball, address from, address to ) external; /// @notice Handles experience gain during collection function onExperience( FurLib.Furball memory furball, address owner, uint32 experience ) external returns(uint32 totalExp, uint16 level); /// @notice Gets called at the beginning of token render; could add underlaid artwork function render(uint256 tokenId) external view returns(string memory); /// @notice The loot engine can add descriptions to furballs metadata function furballDescription(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.6; import "./LootEngine.sol"; /// @title EngineA /// @author LFG Gaming LLC /// @notice Concrete implementation of LootEngine contract EngineA is LootEngine { constructor(address furballs, address tradeProxy, address companyProxy) LootEngine(furballs, tradeProxy, companyProxy) { } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.6; /// @title FurLib /// @author LFG Gaming LLC /// @notice Utilities for Furballs /// @dev Each of the structs are designed to fit within 256 library FurLib { // Metadata about a wallet. struct Account { uint64 created; // First time this account received a furball uint32 numFurballs; // Number of furballs it currently holds uint32 maxFurballs; // Max it has ever held uint16 maxLevel; // Max level of any furball it currently holds uint16 reputation; // Value assigned by moderators to boost standing uint16 standing; // Computed current standing uint8 permissions; // 0 = user, 1 = moderator, 2 = admin, 3 = owner } // Key data structure given to clients for high-level furball access (furballs.stats) struct FurballStats { uint16 expRate; uint16 furRate; RewardModifiers modifiers; Furball definition; Snack[] snacks; } // The response from a single play session indicating rewards struct Rewards { uint16 levels; uint32 experience; uint32 fur; uint128 loot; } // Stored data structure in Furballs master contract which keeps track of mutable data struct Furball { uint32 number; // Overall number, starting with 1 uint16 count; // Index within the collection uint16 rarity; // Total rarity score for later boosts uint32 experience; // EXP uint32 zone; // When exploring, the zone number. Otherwise, battling. uint16 level; // Current EXP => level; can change based on level up during collect uint16 weight; // Total weight (number of items in inventory) uint64 birth; // Timestamp of furball creation uint64 trade; // Timestamp of last furball trading wallets uint64 last; // Timestamp of last action (battle/explore) uint32 moves; // The size of the collection array for this furball, which is move num. uint256[] inventory; // IDs of items in inventory } // A runtime-calculated set of properties that can affect Furball production during collect() struct RewardModifiers { uint16 expPercent; uint16 furPercent; uint16 luckPercent; uint16 happinessPoints; uint16 energyPoints; uint32 zone; } // For sale via loot engine. struct Snack { uint32 snackId; // Unique ID uint32 duration; // How long it lasts, !expressed in intervals! uint16 furCost; // How much FUR uint16 happiness; // +happiness bost points uint16 energy; // +energy boost points uint16 count; // How many in stack? uint64 fed; // When was it fed (if it is active)? } // Input to the feed() function for multi-play struct Feeding { uint256 tokenId; uint32 snackId; uint16 count; } uint32 public constant Max32 = type(uint32).max; uint8 public constant PERMISSION_USER = 1; uint8 public constant PERMISSION_MODERATOR = 2; uint8 public constant PERMISSION_ADMIN = 4; uint8 public constant PERMISSION_OWNER = 5; uint8 public constant PERMISSION_CONTRACT = 0x10; uint32 public constant EXP_PER_INTERVAL = 500; uint32 public constant FUR_PER_INTERVAL = 100; uint8 public constant LOOT_BYTE_STAT = 1; uint8 public constant LOOT_BYTE_RARITY = 2; uint8 public constant SNACK_BYTE_ENERGY = 0; uint8 public constant SNACK_BYTE_HAPPINESS = 2; uint256 public constant OnePercent = 1000; uint256 public constant OneHundredPercent = 100000; /// @notice Shortcut for equations that saves gas /// @dev The expression (0x100 ** byteNum) is expensive; this covers byte packing for editions. function bytePower(uint8 byteNum) internal pure returns (uint256) { if (byteNum == 0) return 0x1; if (byteNum == 1) return 0x100; if (byteNum == 2) return 0x10000; if (byteNum == 3) return 0x1000000; if (byteNum == 4) return 0x100000000; if (byteNum == 5) return 0x10000000000; if (byteNum == 6) return 0x1000000000000; if (byteNum == 7) return 0x100000000000000; if (byteNum == 8) return 0x10000000000000000; if (byteNum == 9) return 0x1000000000000000000; if (byteNum == 10) return 0x100000000000000000000; if (byteNum == 11) return 0x10000000000000000000000; if (byteNum == 12) return 0x1000000000000000000000000; return (0x100 ** byteNum); } /// @notice Helper to get a number of bytes from a value function extractBytes(uint value, uint8 startAt, uint8 numBytes) internal pure returns (uint) { return (value / bytePower(startAt)) % bytePower(numBytes); } /// @notice Converts exp into a sqrt-able number. function expToLevel(uint32 exp, uint32 maxExp) internal pure returns(uint256) { exp = exp > maxExp ? maxExp : exp; return sqrt(exp < 100 ? 0 : ((exp + exp - 100) / 100)); } /// @notice Simple square root function using the Babylonian method function sqrt(uint32 x) internal pure returns(uint256) { if (x < 1) return 0; if (x < 4) return 1; uint z = (x + 1) / 2; uint y = x; while (z < y) { y = z; z = (x / z + z) / 2; } return y; } /// @notice Convert bytes into a hex str, e.g., an address str function bytesHex(bytes memory data) internal pure returns(string memory) { bytes memory alphabet = "0123456789abcdef"; bytes memory str = new bytes(data.length * 2); for (uint i = 0; i < data.length; i++) { str[i*2] = alphabet[uint(uint8(data[i] >> 4))]; str[1 + i*2] = alphabet[uint(uint8(data[i] & 0x0f))]; } return string(str); } function uint2str(uint _i) internal pure returns (string memory _uintAsString) { if (_i == 0) { return "0"; } uint j = _i; uint len; while (j != 0) { len++; j /= 10; } bytes memory bstr = new bytes(len); uint k = len; while (_i != 0) { k = k-1; uint8 temp = (48 + uint8(_i - _i / 10 * 10)); bytes1 b1 = bytes1(temp); bstr[k] = b1; _i /= 10; } return string(bstr); } function encode(bytes memory data) internal pure returns (string memory) { if (data.length == 0) return ""; string memory table = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; uint256 encodedLen = 4 * ((data.length + 2) / 3); string memory result = new string(encodedLen + 32); assembly { mstore(result, encodedLen) let tablePtr := add(table, 1) let dataPtr := data let endPtr := add(dataPtr, mload(data)) let resultPtr := add(result, 32) for { } lt(dataPtr, endPtr) { } { dataPtr := add(dataPtr, 3) let input := mload(dataPtr) mstore( resultPtr, shl(248, mload(add(tablePtr, and(shr(18, input), 0x3F)))) ) resultPtr := add(resultPtr, 1) mstore( resultPtr, shl(248, mload(add(tablePtr, and(shr(12, input), 0x3F)))) ) resultPtr := add(resultPtr, 1) mstore( resultPtr, shl(248, mload(add(tablePtr, and(shr(6, input), 0x3F)))) ) resultPtr := add(resultPtr, 1) mstore( resultPtr, shl(248, mload(add(tablePtr, and(input, 0x3F)))) ) resultPtr := add(resultPtr, 1) } switch mod(mload(data), 3) case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) } case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) } } return result; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.6; import "./FurLib.sol"; /// @title FurLib /// @author LFG Gaming LLC /// @notice Public utility library around game-specific equations and constants library FurDefs { function rarityName(uint8 rarity) internal pure returns(string memory) { if (rarity == 0) return "Common"; if (rarity == 1) return "Elite"; if (rarity == 2) return "Mythic"; if (rarity == 3) return "Legendary"; return "Ultimate"; } function raritySuffix(uint8 rarity) internal pure returns(string memory) { return rarity == 0 ? "" : string(abi.encodePacked(" (", rarityName(rarity), ")")); } function renderPoints(uint64 ptr, bytes memory data) internal pure returns (uint64, bytes memory) { uint8 cnt = uint8(data[ptr]); ptr++; bytes memory points = ""; for (uint256 i=0; i<cnt; i++) { uint16 x = uint8(data[ptr]) * 256 + uint8(data[ptr + 1]); uint16 y = uint8(data[ptr + 2]) * 256 + uint8(data[ptr + 3]); points = abi.encodePacked(points, FurLib.uint2str(x), ',', FurLib.uint2str(y), i == (cnt - 1) ? '': ' '); ptr += 4; } return (ptr, abi.encodePacked('points="', points, '" ')); } function renderTransform(uint64 ptr, bytes memory data) internal pure returns (uint64, bytes memory) { uint8 len = uint8(data[ptr]); ptr++; bytes memory points = ""; for (uint256 i=0; i<len; i++) { bytes memory point = ""; (ptr, point) = unpackFloat(ptr, data); points = i == (len - 1) ? abi.encodePacked(points, point) : abi.encodePacked(points, point, ' '); } return (ptr, abi.encodePacked('transform="matrix(', points, ')" ')); } function renderDisplay(uint64 ptr, bytes memory data) internal pure returns (uint64, bytes memory) { string[2] memory vals = ['inline', 'none']; return (ptr + 1, abi.encodePacked('display="', vals[uint8(data[ptr])], '" ')); } function renderFloat(uint64 ptr, bytes memory data) internal pure returns (uint64, bytes memory) { uint8 propType = uint8(data[ptr]); string[2] memory floatMap = ['opacity', 'offset']; bytes memory floatVal = ""; (ptr, floatVal) = unpackFloat(ptr + 1, data); return (ptr, abi.encodePacked(floatMap[propType], '="', floatVal,'" ')); } function unpackFloat(uint64 ptr, bytes memory data) internal pure returns(uint64, bytes memory) { uint8 decimals = uint8(data[ptr]); ptr++; if (decimals == 0) return (ptr, '0'); uint8 hi = decimals / 16; uint16 wholeNum = 0; decimals = decimals % 16; if (hi >= 10) { wholeNum = uint16(uint8(data[ptr]) * 256 + uint8(data[ptr + 1])); ptr += 2; } else if (hi >= 8) { wholeNum = uint16(uint8(data[ptr])); ptr++; } if (decimals == 0) return (ptr, abi.encodePacked(hi % 2 == 1 ? '-' : '', FurLib.uint2str(wholeNum))); bytes memory remainder = new bytes(decimals); for (uint8 d=0; d<decimals; d+=2) { remainder[d] = bytes1(48 + uint8(data[ptr] >> 4)); if ((d + 1) < decimals) { remainder[d+1] = bytes1(48 + uint8(data[ptr] & 0x0f)); } ptr++; } return (ptr, abi.encodePacked(hi % 2 == 1 ? '-' : '', FurLib.uint2str(wholeNum), '.', remainder)); } function renderInt(uint64 ptr, bytes memory data) internal pure returns (uint64, bytes memory) { uint8 propType = uint8(data[ptr]); string[13] memory intMap = ['cx', 'cy', 'x', 'x1', 'x2', 'y', 'y1', 'y2', 'r', 'rx', 'ry', 'width', 'height']; uint16 val = uint16(uint8(data[ptr + 1]) * 256) + uint8(data[ptr + 2]); if (val >= 0x8000) { return (ptr + 3, abi.encodePacked(intMap[propType], '="-', FurLib.uint2str(uint32(0x10000 - val)),'" ')); } return (ptr + 3, abi.encodePacked(intMap[propType], '="', FurLib.uint2str(val),'" ')); } function renderStr(uint64 ptr, bytes memory data) internal pure returns(uint64, bytes memory) { string[4] memory strMap = ['id', 'enable-background', 'gradientUnits', 'gradientTransform']; uint8 t = uint8(data[ptr]); require(t < 4, 'STR'); bytes memory str = ""; (ptr, str) = unpackStr(ptr + 1, data); return (ptr, abi.encodePacked(strMap[t], '="', str, '" ')); } function unpackStr(uint64 ptr, bytes memory data) internal pure returns(uint64, bytes memory) { uint8 len = uint8(data[ptr]); bytes memory str = bytes(new string(len)); for (uint8 i=0; i<len; i++) { str[i] = data[ptr + 1 + i]; } return (ptr + 1 + len, str); } }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.6; import "../Furballs.sol"; import "./FurLib.sol"; /// @title FurProxy /// @author LFG Gaming LLC /// @notice Manages a link from a sub-contract back to the master Furballs contract /// @dev Provides permissions by means of proxy abstract contract FurProxy { Furballs public furballs; constructor(address furballsAddress) { furballs = Furballs(furballsAddress); } /// @notice Allow upgrading contract links function setFurballs(address addr) external onlyOwner { furballs = Furballs(addr); } /// @notice Proxied from permissions lookup modifier onlyOwner() { require(_permissions(msg.sender) >= FurLib.PERMISSION_OWNER, "OWN"); _; } /// @notice Permission modifier for moderators (covers owner) modifier gameAdmin() { require(_permissions(msg.sender) >= FurLib.PERMISSION_ADMIN, "GAME"); _; } /// @notice Permission modifier for moderators (covers admin) modifier gameModerators() { require(_permissions(msg.sender) >= FurLib.PERMISSION_MODERATOR, "MOD"); _; } modifier onlyFurballs() { require(msg.sender == address(furballs), "FBL"); _; } /// @notice Generalized permissions flag for a given address function _permissions(address addr) internal view returns (uint8) { // User permissions will return "zero" quickly if this didn't come from a wallet. uint8 permissions = _userPermissions(addr); if (permissions > 0) return permissions; if (addr == address(furballs) || addr == address(furballs.engine()) || addr == address(furballs.furgreement()) || addr == address(furballs.governance()) || addr == address(furballs.fur()) ) { return FurLib.PERMISSION_CONTRACT; } return 0; } function _userPermissions(address addr) internal view returns (uint8) { // Invalid addresses include contracts an non-wallet interactions, which have no permissions if (addr == address(0)) return 0; uint256 size; assembly { size := extcodesize(addr) } if (addr != tx.origin || size != 0) return 0; if (addr == furballs.owner()) return FurLib.PERMISSION_OWNER; if (furballs.isAdmin(addr)) return FurLib.PERMISSION_ADMIN; if (furballs.isModerator(addr)) return FurLib.PERMISSION_MODERATOR; return FurLib.PERMISSION_USER; } }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.6; import "@openzeppelin/contracts/access/Ownable.sol"; /// @title Moderated /// @author LFG Gaming LLC /// @notice Administration & moderation permissions utilities abstract contract Moderated is Ownable { mapping (address => bool) public admins; mapping (address => bool) public moderators; function setAdmin(address addr, bool set) external onlyOwner { require(addr != address(0)); admins[addr] = set; } /// @notice Moderated ownables may not be renounced (only transferred) function renounceOwnership() public override onlyOwner { require(false, 'OWN'); } function setModerator(address mod, bool set) external onlyAdmin { require(mod != address(0)); moderators[mod] = set; } function isAdmin(address addr) public virtual view returns(bool) { return owner() == addr || admins[addr]; } function isModerator(address addr) public virtual view returns(bool) { return isAdmin(addr) || moderators[addr]; } modifier onlyModerators() { require(isModerator(msg.sender), 'MOD'); _; } modifier onlyAdmin() { require(isAdmin(msg.sender), 'ADMIN'); _; } }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.6; import "./Stakeholders.sol"; import "./Community.sol"; import "./FurLib.sol"; /// @title Governance /// @author LFG Gaming LLC /// @notice Meta-tracker for Furballs; looks at the ecosystem (metadata, wallet counts, etc.) /// @dev Shares is an ERC20; stakeholders is a payable contract Governance is Stakeholders { /// @notice Where transaction fees are deposited address payable public treasury; /// @notice How much is the transaction fee, in basis points? uint16 public transactionFee = 250; /// @notice Used in contractURI for Furballs itself. string public metaName = "Furballs.com (Official)"; /// @notice Used in contractURI for Furballs itself. string public metaDescription = "Furballs are entirely on-chain, with a full interactive gameplay experience at Furballs.com. " "There are 88 billion+ possible furball combinations in the first edition, each with their own special abilities" "... but only thousands minted per edition. Each edition has new artwork, game modes, and surprises."; // Tracks the MAX which are ever owned by a given address. mapping(address => FurLib.Account) private _account; // List of all addresses which have ever owned a furball. address[] public accounts; Community public community; constructor(address furballsAddress) Stakeholders(furballsAddress) { treasury = payable(this); } /// @notice Generic form of contractURI for on-chain packing. /// @dev Proxied from Furballs, but not called contractURI so as to not imply this ERC20 is tradeable. function metaURI() public view returns(string memory) { return string(abi.encodePacked("data:application/json;base64,", FurLib.encode(abi.encodePacked( '{"name": "', metaName,'", "description": "', metaDescription,'"', ', "external_link": "https://furballs.com"', ', "image": "https://furballs.com/images/pfp.png"', ', "seller_fee_basis_points": ', FurLib.uint2str(transactionFee), ', "fee_recipient": "0x', FurLib.bytesHex(abi.encodePacked(treasury)), '"}' )))); } /// @notice total count of accounts function numAccounts() external view returns(uint256) { return accounts.length; } /// @notice Update metadata for main contractURI function setMeta(string memory nameVal, string memory descVal) external gameAdmin { metaName = nameVal; metaDescription = descVal; } /// @notice The transaction fee can be adjusted function setTransactionFee(uint16 basisPoints) external gameAdmin { transactionFee = basisPoints; } /// @notice The treasury can be changed in only rare circumstances. function setTreasury(address treasuryAddress) external onlyOwner { treasury = payable(treasuryAddress); } /// @notice The treasury can be changed in only rare circumstances. function setCommunity(address communityAddress) external onlyOwner { community = Community(communityAddress); } /// @notice public accessor updates permissions function getAccount(address addr) external view returns (FurLib.Account memory) { FurLib.Account memory acc = _account[addr]; acc.permissions = _userPermissions(addr); return acc; } /// @notice Public function allowing manual update of standings function updateStandings(address[] memory addrs) public { for (uint32 i=0; i<addrs.length; i++) { _updateStanding(addrs[i]); } } /// @notice Moderators may assign reputation to accounts function setReputation(address addr, uint16 rep) external gameModerators { _account[addr].reputation = rep; } /// @notice Tracks the max level an account has *obtained* function updateMaxLevel(address addr, uint16 level) external gameAdmin { if (_account[addr].maxLevel >= level) return; _account[addr].maxLevel = level; _updateStanding(addr); } /// @notice Recompute max stats for the account. function updateAccount(address addr, uint256 numFurballs) external gameAdmin { FurLib.Account memory acc = _account[addr]; // Recompute account permissions for internal rewards uint8 permissions = _userPermissions(addr); if (permissions != acc.permissions) _account[addr].permissions = permissions; // New account created? if (acc.created == 0) _account[addr].created = uint64(block.timestamp); if (acc.numFurballs != numFurballs) _account[addr].numFurballs = uint32(numFurballs); // New max furballs? if (numFurballs > acc.maxFurballs) { if (acc.maxFurballs == 0) accounts.push(addr); _account[addr].maxFurballs = uint32(numFurballs); } _updateStanding(addr); } /// @notice Re-computes the account's standing function _updateStanding(address addr) internal { uint256 standing = 0; FurLib.Account memory acc = _account[addr]; if (address(community) != address(0)) { // If community is patched in later... standing = community.update(acc, addr); } else { // Default computation of standing uint32 num = acc.numFurballs; if (num > 0) { standing = num * 10 + acc.maxLevel + acc.reputation; } } _account[addr].standing = uint16(standing); } }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.6; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "./Furballs.sol"; import "./editions/IFurballEdition.sol"; import "./utils/FurProxy.sol"; /// @title Fur /// @author LFG Gaming LLC /// @notice Utility token for in-game rewards in Furballs contract Fur is ERC20, FurProxy { // n.b., this contract has some unusual tight-coupling between FUR and Furballs // Simple reason: this contract had more space, and is the only other allowed to know about ownership // Thus it serves as a sort of shop meta-store for Furballs // tokenId => mapping of fed _snacks mapping(uint256 => FurLib.Snack[]) public _snacks; // Internal cache for speed. uint256 private _intervalDuration; constructor(address furballsAddress) FurProxy(furballsAddress) ERC20("Fur", "FUR") { _intervalDuration = furballs.intervalDuration(); } // ----------------------------------------------------------------------------------------------- // Public // ----------------------------------------------------------------------------------------------- /// @notice Returns the snacks currently applied to a Furball function snacks(uint256 tokenId) external view returns(FurLib.Snack[] memory) { return _snacks[tokenId]; } /// @notice Write-function to cleanup the snacks for a token (remove expired) function cleanSnacks(uint256 tokenId) public returns (uint256) { if (_snacks[tokenId].length == 0) return 0; return _cleanSnack(tokenId, 0); } /// @notice The public accessor calculates the snack boosts function snackEffects(uint256 tokenId) external view returns(uint256) { uint16 hap = 0; uint16 en = 0; for (uint32 i=0; i<_snacks[tokenId].length && i <= FurLib.Max32; i++) { uint256 remaining = _snackTimeRemaning(_snacks[tokenId][i]); if (remaining > 0) { hap += _snacks[tokenId][i].happiness; en += _snacks[tokenId][i].energy; } } return (hap * 0x10000) + (en); } // ----------------------------------------------------------------------------------------------- // GameAdmin // ----------------------------------------------------------------------------------------------- /// @notice FUR can only be minted by furballs doing battle. function earn(address addr, uint256 amount) external gameAdmin { if (amount == 0) return; _mint(addr, amount); } /// @notice FUR can be spent by Furballs, or by the LootEngine (shopping, in the future) function spend(address addr, uint256 amount) external gameAdmin { _burn(addr, amount); } /// @notice Pay any necessary fees to mint a furball /// @dev Delegated logic from Furballs; function purchaseMint( address from, uint8 permissions, address to, IFurballEdition edition ) external gameAdmin returns (bool) { require(edition.maxMintable(to) > 0, "LIVE"); uint32 cnt = edition.count(); uint32 adoptable = edition.maxAdoptable(); bool requiresPurchase = cnt >= adoptable; if (requiresPurchase) { // _gift will throw if cannot gift or cannot afford cost _gift(from, permissions, to, edition.purchaseFur()); } return requiresPurchase; } /// @notice Attempts to purchase an upgrade for a loot item /// @dev Delegated logic from Furballs function purchaseUpgrade( FurLib.RewardModifiers memory modifiers, address from, uint8 permissions, uint256 tokenId, uint128 lootId, uint8 chances ) external gameAdmin returns(uint128) { address owner = furballs.ownerOf(tokenId); // _gift will throw if cannot gift or cannot afford cost _gift(from, permissions, owner, 500 * uint256(chances)); return furballs.engine().upgradeLoot(modifiers, owner, lootId, chances); } /// @notice Attempts to purchase a snack using templates found in the engine /// @dev Delegated logic from Furballs function purchaseSnack( address from, uint8 permissions, uint256 tokenId, uint32 snackId, uint16 count ) external gameAdmin { FurLib.Snack memory snack = furballs.engine().getSnack(snackId); require(snack.count > 0, "COUNT"); require(snack.fed == 0, "FED"); // _gift will throw if cannot gift or cannot afford costQ _gift(from, permissions, furballs.ownerOf(tokenId), snack.furCost * count); uint256 snackData = _cleanSnack(tokenId, snack.snackId); uint32 existingSnackNumber = uint32(snackData / 0x100000000); snack.count *= count; if (existingSnackNumber > 0) { // Adding count effectively adds duration to the active snack _snacks[tokenId][existingSnackNumber - 1].count += snack.count; } else { // A new snack just gets pushed onto the array snack.fed = uint64(block.timestamp); _snacks[tokenId].push(snack); } } // ----------------------------------------------------------------------------------------------- // Internal // ----------------------------------------------------------------------------------------------- /// @notice Both removes inactive _snacks from a token and searches for a specific snack Id index /// @dev Both at once saves some size & ensures that the _snacks are frequently cleaned. /// @return The index+1 of the existing snack function _cleanSnack(uint256 tokenId, uint32 snackId) internal returns(uint256) { uint32 ret = 0; uint16 hap = 0; uint16 en = 0; for (uint32 i=1; i<=_snacks[tokenId].length && i <= FurLib.Max32; i++) { FurLib.Snack memory snack = _snacks[tokenId][i-1]; // Has the snack transitioned from active to inactive? if (_snackTimeRemaning(snack) == 0) { if (_snacks[tokenId].length > 1) { _snacks[tokenId][i-1] = _snacks[tokenId][_snacks[tokenId].length - 1]; } _snacks[tokenId].pop(); i--; // Repeat this idx continue; } hap += snack.happiness; en += snack.energy; if (snackId != 0 && snack.snackId == snackId) { ret = i; } } return (ret * 0x100000000) + (hap * 0x10000) + (en); } /// @notice Check if the snack is active; returns 0 if inactive, otherwise the duration function _snackTimeRemaning(FurLib.Snack memory snack) internal view returns(uint256) { if (snack.fed == 0) return 0; uint256 expiresAt = uint256(snack.fed + (snack.count * snack.duration * _intervalDuration)); return expiresAt <= block.timestamp ? 0 : (expiresAt - block.timestamp); } /// @notice Enforces (requires) only admins/game may give gifts /// @param to Whom is this being sent to? /// @return If this is a gift or not. function _gift(address from, uint8 permissions, address to, uint256 furCost) internal returns(bool) { bool isGift = to != from; // Only admins or game engine can send gifts (to != self), which are always free. require(!isGift || permissions >= FurLib.PERMISSION_ADMIN, "GIFT"); if (!isGift && furCost > 0) { _burn(from, furCost); } return isGift; } }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.6; import "./Furballs.sol"; import "./utils/FurProxy.sol"; import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol"; import "@openzeppelin/contracts/utils/cryptography/draft-EIP712.sol"; /// @title Furballs /// @author LFG Gaming LLC /// @notice Has permissions to act as a proxy to the Furballs contract /// @dev https://soliditydeveloper.com/ecrecover contract Furgreement is EIP712, FurProxy { mapping(address => uint256) private nonces; address[] public addressQueue; mapping(address => PlayMove) public pendingMoves; // A "move to be made" in the sig queue struct PlayMove { uint32 zone; uint256[] tokenIds; } constructor(address furballsAddress) EIP712("Furgreement", "1") FurProxy(furballsAddress) { } /// @notice Proxy playMany to Furballs contract function playFromSignature( bytes memory signature, address owner, PlayMove memory move, uint256 deadline ) external { bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( keccak256("playMany(address owner,PlayMove memory move,uint256 nonce,uint256 deadline)"), owner, move, nonces[owner], deadline ))); address signer = ECDSA.recover(digest, signature); require(signer == owner, "playMany: invalid signature"); require(signer != address(0), "ECDSA: invalid signature"); require(block.timestamp < deadline, "playMany: signed transaction expired"); nonces[owner]++; if (pendingMoves[owner].tokenIds.length == 0) { addressQueue.push(owner); } pendingMoves[owner] = move; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "./extensions/IERC721Metadata.sol"; import "../../utils/Address.sol"; import "../../utils/Context.sol"; import "../../utils/Strings.sol"; import "../../utils/introspection/ERC165.sol"; /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension, but not including the Enumerable extension, which is available separately as * {ERC721Enumerable}. */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { using Address for address; using Strings for uint256; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to owner address mapping(uint256 => address) private _owners; // Mapping owner address to token count mapping(address => uint256) private _balances; // Mapping from token ID to approved address mapping(uint256 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: balance query for the zero address"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _owners[tokenId]; require(owner != address(0), "ERC721: owner query for nonexistent token"); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ""; } /** * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. Empty * by default, can be overriden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721.ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require( _msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { 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.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 "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Enumerable is IERC721 { /** * @dev Returns the total amount of tokens stored by the contract. */ function totalSupply() external view returns (uint256); /** * @dev Returns a token ID owned by `owner` at a given `index` of its token list. * Use along with {balanceOf} to enumerate all of ``owner``'s tokens. */ function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId); /** * @dev Returns a token ID at a given `index` of all the tokens stored by the contract. * Use along with {totalSupply} to enumerate all tokens. */ function tokenByIndex(uint256 index) external view returns (uint256); }
// SPDX-License-Identifier: MIT 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; /** * @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 "../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; /** * @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); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT 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 "./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 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: UNLICENSED pragma solidity ^0.8.6; import "./ILootEngine.sol"; import "../editions/IFurballEdition.sol"; import "../Furballs.sol"; import "../utils/FurLib.sol"; import "../utils/FurProxy.sol"; import "../utils/ProxyRegistry.sol"; import "../utils/Dice.sol"; import "../utils/Governance.sol"; import "../utils/MetaData.sol"; import "@openzeppelin/contracts/utils/introspection/ERC165.sol"; /// @title LootEngine /// @author LFG Gaming LLC /// @notice Base implementation of the loot engine abstract contract LootEngine is ERC165, ILootEngine, Dice, FurProxy { ProxyRegistry private _proxies; // An address which may act on behalf of the owner (company) address public companyWalletProxy; // snackId to "definition" of the snack mapping(uint32 => FurLib.Snack) private _snacks; uint32 maxExperience = 2010000; constructor( address furballsAddress, address tradeProxy, address companyProxy ) FurProxy(furballsAddress) { _proxies = ProxyRegistry(tradeProxy); companyWalletProxy = companyProxy; _defineSnack(0x100, 24 , 250, 15, 0); _defineSnack(0x200, 24 * 3, 750, 20, 0); _defineSnack(0x300, 24 * 7, 1500, 25, 0); } /// @notice Allows admins to configure the snack store. function setSnack( uint32 snackId, uint32 duration, uint16 furCost, uint16 hap, uint16 en ) external gameAdmin { _defineSnack(snackId, duration, furCost, hap, en); } /// @notice Loot can have different weight to help prevent over-powering a furball /// @dev Each point of weight can be offset by a point of energy; the result reduces luck function weightOf(uint128 lootId) external virtual override pure returns (uint16) { return 2; } /// @notice Gets called for Metadata function furballDescription(uint256 tokenId) external virtual override view returns (string memory) { return ""; } /// @notice Gets called at the beginning of token render; could add underlaid artwork function render(uint256 tokenId) external virtual override view returns(string memory) { return ""; } /// @notice Checking the zone may use _require to detect preconditions. function enterZone( uint256 tokenId, uint32 zone, uint256[] memory team ) external virtual override returns(uint256) { // Nothing to see here. return uint256(zone); } /// @notice Proxy logic is presently delegated to OpenSea-like contract function canProxyTrades( address owner, address operator ) external virtual override view onlyFurballs returns(bool) { if (address(_proxies) == address(0)) return false; return address(_proxies.proxies(owner)) == operator; } /// @notice Allow a player to play? Throws on error if not. /// @dev This is core gameplay security logic function approveSender(address sender) external virtual override view onlyFurballs returns(uint) { if (sender == companyWalletProxy && sender != address(0)) return FurLib.PERMISSION_OWNER; return _permissions(sender); } /// @notice Calculates new level for experience function onExperience( FurLib.Furball memory furball, address owner, uint32 experience ) external virtual override onlyFurballs returns(uint32 totalExp, uint16 levels) { if (experience == 0) return (0, 0); uint32 has = furball.experience; uint32 max = maxExperience; totalExp = (experience < max && has < (max - experience)) ? (has + experience) : max; // Calculate new level & check for level-up uint16 oldLevel = furball.level; uint16 level = uint16(FurLib.expToLevel(totalExp, max)); levels = level > oldLevel ? (level - oldLevel) : 0; if (levels > 0) { // Update community standing furballs.governance().updateMaxLevel(owner, level); } return (totalExp, levels); } /// @notice The trade hook can update balances or assign rewards function onTrade( FurLib.Furball memory furball, address from, address to ) external virtual override onlyFurballs { Governance gov = furballs.governance(); if (from != address(0)) gov.updateAccount(from, furballs.balanceOf(from) - 1); if (to != address(0)) gov.updateAccount(to, furballs.balanceOf(to) + 1); } /// @notice Attempt to upgrade a given piece of loot (item ID) function upgradeLoot( FurLib.RewardModifiers memory modifiers, address owner, uint128 lootId, uint8 chances ) external virtual override returns(uint128) { (uint8 rarity, uint8 stat) = _itemRarityStat(lootId); require(rarity > 0 && rarity < 3, "RARITY"); uint32 chance = (rarity == 1 ? 75 : 25) * uint32(chances) + uint32(modifiers.luckPercent * 10); // Remove the 100% from loot, with 5% minimum chance chance = chance > 1050 ? (chance - 1000) : 50; // Even with many chances, odds are capped: if (chance > 750) chance = 750; uint32 threshold = (FurLib.Max32 / 1000) * (1000 - chance); uint256 rolled = (uint256(roll(modifiers.expPercent))); return rolled < threshold ? 0 : _packLoot(rarity + 1, stat); } /// @notice Main loot-drop functionm function dropLoot( uint32 intervals, FurLib.RewardModifiers memory modifiers ) external virtual override onlyFurballs returns(uint128) { // Only battles drop loot. if (modifiers.zone >= 0x10000) return 0; (uint8 rarity, uint8 stat) = rollRarityStat( uint32((intervals * uint256(modifiers.luckPercent)) /100), 0); return _packLoot(rarity, stat); } function _packLoot(uint16 rarity, uint16 stat) internal pure returns(uint128) { return rarity == 0 ? 0 : (uint16(rarity) * 0x10000) + (stat * 0x100); } /// @notice Core loot drop rarity randomization /// @dev exposes an interface helpful for the unit tests, but is not otherwise called publicly function rollRarityStat(uint32 chance, uint32 seed) public returns(uint8, uint8) { if (chance == 0) return (0, 0); uint32 threshold = 4320; uint32 rolled = roll(seed) % threshold; uint8 stat = uint8(rolled % 2); if (chance > threshold || rolled >= (threshold - chance)) return (3, stat); threshold -= chance; if (chance * 3 > threshold || rolled >= (threshold - chance * 3)) return (2, stat); threshold -= chance * 3; if (chance * 6 > threshold || rolled >= (threshold - chance * 6)) return (1, stat); return (0, stat); } /// @notice The snack shop has IDs for each snack definition function getSnack(uint32 snackId) external view virtual override returns(FurLib.Snack memory) { return _snacks[snackId]; } /// @notice Layers on LootEngine modifiers to rewards function modifyReward( FurLib.Furball memory furball, FurLib.RewardModifiers memory modifiers, FurLib.Account memory account, bool contextual ) external virtual override view returns(FurLib.RewardModifiers memory) { // Use temporary variables instead of re-assignment uint16 energy = modifiers.energyPoints; uint16 weight = furball.weight; uint16 expPercent = modifiers.expPercent + modifiers.happinessPoints; uint16 luckPercent = modifiers.luckPercent + modifiers.happinessPoints; uint16 furPercent = modifiers.furPercent + _furBoost(furball.level) + energy; // First add in the inventory for (uint256 i=0; i<furball.inventory.length; i++) { uint128 lootId = uint128(furball.inventory[i] / 0x100); uint32 stackSize = uint32(furball.inventory[i] % 0x100); (uint8 rarity, uint8 stat) = _itemRarityStat(lootId); uint16 boost = uint16(_lootRarityBoost(rarity) * stackSize); if (stat == 0) { expPercent += boost; } else { furPercent += boost; } } // Team size boosts! uint256 teamSize = account.permissions < 2 ? account.numFurballs : 0; if (teamSize < 10 && teamSize > 1) { uint16 amt = uint16(2 * (teamSize - 1)); expPercent += amt; furPercent += amt; } // --------------------------------------------------------------------------------------------- // Negative impacts come last, so subtraction does not underflow. // --------------------------------------------------------------------------------------------- // Penalties for whales. if (teamSize > 10) { uint16 amt = uint16(5 * (teamSize > 20 ? 10 : (teamSize - 10))); expPercent -= amt; furPercent -= amt; } // Calculate weight & reduce luck if (weight > 0) { if (energy > 0) { weight = (energy >= weight) ? 0 : (weight - energy); } if (weight > 0) { luckPercent = weight >= luckPercent ? 0 : (luckPercent - weight); } } modifiers.expPercent = expPercent; modifiers.furPercent = furPercent; modifiers.luckPercent = luckPercent; return modifiers; } /// @notice OpenSea metadata function attributesMetadata( uint256 tokenId ) external virtual override view returns(bytes memory) { FurLib.FurballStats memory stats = furballs.stats(tokenId, false); return abi.encodePacked( MetaData.traitValue("Level", stats.definition.level), MetaData.traitValue("Rare Genes Boost", stats.definition.rarity), MetaData.traitNumber("Edition", (tokenId % 0x100) + 1), MetaData.traitNumber("Unique Loot Collected", stats.definition.inventory.length), MetaData.traitBoost("EXP Boost", stats.modifiers.expPercent), MetaData.traitBoost("FUR Boost", stats.modifiers.furPercent), MetaData.traitDate("Acquired", stats.definition.trade), MetaData.traitDate("Birthday", stats.definition.birth) ); } /// @notice Store a new snack definition function _defineSnack( uint32 snackId, uint32 duration, uint16 furCost, uint16 hap, uint16 en ) internal { _snacks[snackId].snackId = snackId; _snacks[snackId].duration = duration; _snacks[snackId].furCost = furCost; _snacks[snackId].happiness = hap; _snacks[snackId].energy = en; _snacks[snackId].count = 1; _snacks[snackId].fed = 0; } function _lootRarityBoost(uint16 rarity) internal pure returns (uint16) { if (rarity == 1) return 5; else if (rarity == 2) return 15; else if (rarity == 3) return 30; return 0; } /// @notice Gets the FUR boost for a given level function _furBoost(uint16 level) internal pure returns (uint16) { if (level >= 200) return 581; if (level < 25) return (2 * level); if (level < 50) return (5000 + (level - 25) * 225) / 100; if (level < 75) return (10625 + (level - 50) * 250) / 100; if (level < 100) return (16875 + (level - 75) * 275) / 100; if (level < 125) return (23750 + (level - 100) * 300) / 100; if (level < 150) return (31250 + (level - 125) * 325) / 100; if (level < 175) return (39375 + (level - 150) * 350) / 100; return (48125 + (level - 175) * 375) / 100; } /// @notice Unpacks an item, giving its rarity + stat function _itemRarityStat(uint128 lootId) internal pure returns (uint8, uint8) { return ( uint8(FurLib.extractBytes(lootId, FurLib.LOOT_BYTE_RARITY, 1)), uint8(FurLib.extractBytes(lootId, FurLib.LOOT_BYTE_STAT, 1))); } function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(ILootEngine).interfaceId || super.supportsInterface(interfaceId); } }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.6; // Contract doesn't really provide anything... contract OwnableDelegateProxy {} // Required format for OpenSea of proxy delegate store // https://github.com/ProjectOpenSea/opensea-creatures/blob/f7257a043e82fae8251eec2bdde37a44fee474c4/contracts/ERC721Tradable.sol // https://etherscan.io/address/0xa5409ec958c83c3f309868babaca7c86dcb077c1#code contract ProxyRegistry { mapping(address => OwnableDelegateProxy) public proxies; }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.6; import "./FurLib.sol"; /// @title Dice /// @author LFG Gaming LLC /// @notice Math utility functions that leverage storage and thus cannot be pure abstract contract Dice { uint32 private LAST = 0; // Re-seed for PRNG /// @notice A PRNG which re-seeds itself with block information & another PRNG /// @dev This is unit-tested with monobit (frequency) and longestRunOfOnes function roll(uint32 seed) public returns (uint32) { LAST = uint32(uint256(keccak256( abi.encodePacked(block.timestamp, block.basefee, _prng(LAST == 0 ? seed : LAST))) )); return LAST; } /// @notice A PRNG based upon a Lehmer (Park-Miller) method /// @dev https://en.wikipedia.org/wiki/Lehmer_random_number_generator function _prng(uint32 seed) internal view returns (uint32) { uint64 nonce = seed == 0 ? uint32(block.timestamp) : seed; uint64 product = uint64(nonce) * 48271; uint32 x = uint32((product % 0x7fffffff) + (product >> 31)); return (x & 0x7fffffff) + (x >> 31); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.6; import "./FurLib.sol"; /// @title MetaData /// @author LFG Gaming LLC /// @notice Utilities for creating MetaData (e.g., OpenSea) library MetaData { function trait(string memory traitType, string memory value) internal pure returns (bytes memory) { return abi.encodePacked('{"trait_type": "', traitType,'", "value": "', value, '"}, '); } function traitNumberDisplay( string memory traitType, string memory displayType, uint256 value ) internal pure returns (bytes memory) { return abi.encodePacked( '{"trait_type": "', traitType, bytes(displayType).length > 0 ? '", "display_type": "' : '', displayType, '", "value": ', FurLib.uint2str(value), '}, ' ); } function traitValue(string memory traitType, uint256 value) internal pure returns (bytes memory) { return traitNumberDisplay(traitType, "", value); } /// @notice Convert a modifier percentage (120%) into a metadata +20% boost function traitBoost( string memory traitType, uint256 percent ) internal pure returns (bytes memory) { return traitNumberDisplay(traitType, "boost_percentage", percent > 100 ? (percent - 100) : 0); } function traitNumber( string memory traitType, uint256 value ) internal pure returns (bytes memory) { return traitNumberDisplay(traitType, "number", value); } function traitDate( string memory traitType, uint256 value ) internal pure returns (bytes memory) { return traitNumberDisplay(traitType, "date", value); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _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: UNLICENSED pragma solidity ^0.8.6; import "./FurProxy.sol"; import "./FurLib.sol"; import "../Furballs.sol"; /// @title Stakeholders /// @author LFG Gaming LLC /// @notice Tracks "percent ownership" of a smart contract, paying out according to schedule /// @dev Acts as a treasury, receiving ETH funds and distributing them to stakeholders abstract contract Stakeholders is FurProxy { // stakeholder values, in 1/1000th of a percent (received during withdrawls) mapping(address => uint64) public stakes; // List of stakeholders. address[] public stakeholders; // Where any remaining funds should be deposited. Defaults to contract creator. address payable public poolAddress; constructor(address furballsAddress) FurProxy(furballsAddress) { poolAddress = payable(msg.sender); } /// @notice Overflow pool of funds. Contains remaining funds from withdrawl. function setPool(address addr) public onlyOwner { poolAddress = payable(addr); } /// @notice Changes payout percentages. function setStakeholder(address addr, uint64 stake) public onlyOwner { if (!_hasStakeholder(addr)) { stakeholders.push(addr); } uint64 percent = stake; for (uint256 i=0; i<stakeholders.length; i++) { if (stakeholders[i] != addr) { percent += stakes[stakeholders[i]]; } } require(percent <= FurLib.OneHundredPercent, "Invalid stake (exceeds 100%)"); stakes[addr] = stake; } /// @notice Empties this contract's balance, paying out to stakeholders. function withdraw() external gameAdmin { uint256 balance = address(this).balance; require(balance >= FurLib.OneHundredPercent, "Insufficient balance"); for (uint256 i=0; i<stakeholders.length; i++) { address addr = stakeholders[i]; uint256 payout = balance * uint256(stakes[addr]) / FurLib.OneHundredPercent; if (payout > 0) { payable(addr).transfer(payout); } } uint256 remaining = address(this).balance; poolAddress.transfer(remaining); } /// @notice Check function _hasStakeholder(address addr) internal view returns(bool) { for (uint256 i=0; i<stakeholders.length; i++) { if (stakeholders[i] == addr) { return true; } } return false; } // ----------------------------------------------------------------------------------------------- // Payable // ----------------------------------------------------------------------------------------------- /// @notice This contract can be paid transaction fees, e.g., from OpenSea /// @dev The contractURI specifies itself as the recipient of transaction fees receive() external payable { } }
// SPDX-License-Identifier: BSD-3-Clause /// @title Vote checkpointing for an ERC-721 token /// @dev This ERC20 has been adopted from /// https://github.com/nounsDAO/nouns-monorepo/blob/master/packages/nouns-contracts/contracts/base/ERC721Checkpointable.sol /********************************* * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ * * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ * * ░░░░░░█████████░░█████████░░░ * * ░░░░░░██░░░████░░██░░░████░░░ * * ░░██████░░░████████░░░████░░░ * * ░░██░░██░░░████░░██░░░████░░░ * * ░░██░░██░░░████░░██░░░████░░░ * * ░░░░░░█████████░░█████████░░░ * * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ * * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ * *********************************/ // LICENSE // Community.sol uses and modifies part of Compound Lab's Comp.sol: // https://github.com/compound-finance/compound-protocol/blob/ae4388e780a8d596d97619d9704a931a2752c2bc/contracts/Governance/Comp.sol // // Comp.sol source code Copyright 2020 Compound Labs, Inc. licensed under the BSD-3-Clause license. // With modifications by Nounders DAO. // // Additional conditions of BSD-3-Clause can be found here: https://opensource.org/licenses/BSD-3-Clause // // MODIFICATIONS // Checkpointing logic from Comp.sol has been used with the following modifications: // - `delegates` is renamed to `_delegates` and is set to private // - `delegates` is a public function that uses the `_delegates` mapping look-up, but unlike // Comp.sol, returns the delegator's own address if there is no delegate. // This avoids the delegator needing to "delegate to self" with an additional transaction // - `_transferTokens()` is renamed `_beforeTokenTransfer()` and adapted to hook into OpenZeppelin's ERC721 hooks. pragma solidity ^0.8.6; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "./FurLib.sol"; /// @title Community /// @author LFG Gaming LLC /// @notice This is a derived token; it represents a weighted balance of the ERC721 token (Furballs). /// @dev There is no fiscal interest in Community. This is simply a measured value of community voice. contract Community is ERC20 { /// @notice A record of each accounts delegate mapping(address => address) private _delegates; /// @notice A checkpoint for marking number of votes from a given block struct Checkpoint { uint32 fromBlock; uint96 votes; } constructor() ERC20("FurballsCommunity", "FBLS") { } /// @notice A record of votes checkpoints for each account, by index mapping(address => mapping(uint32 => Checkpoint)) public checkpoints; /// @notice The number of checkpoints for each account mapping(address => uint32) public numCheckpoints; /// @notice The EIP-712 typehash for the contract's domain bytes32 public constant DOMAIN_TYPEHASH = keccak256('EIP712Domain(string name,uint256 chainId,address verifyingContract)'); /// @notice The EIP-712 typehash for the delegation struct used by the contract bytes32 public constant DELEGATION_TYPEHASH = keccak256('Delegation(address delegatee,uint256 nonce,uint256 expiry)'); /// @notice A record of states for signing / validating signatures mapping(address => uint256) public nonces; /// @notice An event thats emitted when an account changes its delegate event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate); /// @notice An event thats emitted when a delegate account's vote balance changes event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance); /** * @notice The votes a delegator can delegate, which is the current balance of the delegator. * @dev Used when calling `_delegate()` */ function votesToDelegate(address delegator) public view returns (uint96) { return safe96(balanceOf(delegator), 'Community::votesToDelegate: amount exceeds 96 bits'); } /** * @notice Overrides the standard `Comp.sol` delegates mapping to return * the delegator's own address if they haven't delegated. * This avoids having to delegate to oneself. */ function delegates(address delegator) public view returns (address) { address current = _delegates[delegator]; return current == address(0) ? delegator : current; } /// @notice Sets the addresses' standing directly function update(FurLib.Account memory account, address addr) external returns (uint256) { require(false, 'NEED SECURITY'); // uint256 balance = balanceOf(addr); // if (standing > balance) { // _mint(addr, standing - balance); // } else if (standing < balance) { // _burn(addr, balance - standing); // } } /** * @notice Adapted from `_transferTokens()` in `Comp.sol` to update delegate votes. * @dev hooks into OpenZeppelin's `ERC721._transfer` */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal override { super._beforeTokenTransfer(from, to, amount); require(from == address(0), "Votes may not be traded."); /// @notice Differs from `_transferTokens()` to use `delegates` override method to simulate auto-delegation _moveDelegates(delegates(from), delegates(to), uint96(amount)); } /** * @notice Delegate votes from `msg.sender` to `delegatee` * @param delegatee The address to delegate votes to */ function delegate(address delegatee) public { if (delegatee == address(0)) delegatee = msg.sender; return _delegate(msg.sender, delegatee); } /** * @notice Delegates votes from signatory to `delegatee` * @param delegatee The address to delegate votes to * @param nonce The contract state required to match the signature * @param expiry The time at which to expire the signature * @param v The recovery byte of the signature * @param r Half of the ECDSA signature pair * @param s Half of the ECDSA signature pair */ function delegateBySig( address delegatee, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s ) public { bytes32 domainSeparator = keccak256( abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name())), getChainId(), address(this)) ); bytes32 structHash = keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry)); bytes32 digest = keccak256(abi.encodePacked('\x19\x01', domainSeparator, structHash)); address signatory = ecrecover(digest, v, r, s); require(signatory != address(0), 'Community::delegateBySig: invalid signature'); require(nonce == nonces[signatory]++, 'Community::delegateBySig: invalid nonce'); require(block.timestamp <= expiry, 'Community::delegateBySig: signature expired'); return _delegate(signatory, delegatee); } /** * @notice Gets the current votes balance for `account` * @param account The address to get votes balance * @return The number of current votes for `account` */ function getCurrentVotes(address account) external view returns (uint96) { uint32 nCheckpoints = numCheckpoints[account]; return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0; } /** * @notice Determine the prior number of votes for an account as of a block number * @dev Block number must be a finalized block or else this function will revert to prevent misinformation. * @param account The address of the account to check * @param blockNumber The block number to get the vote balance at * @return The number of votes the account had as of the given block */ function getPriorVotes(address account, uint256 blockNumber) public view returns (uint96) { require(blockNumber < block.number, 'Community::getPriorVotes: not yet determined'); uint32 nCheckpoints = numCheckpoints[account]; if (nCheckpoints == 0) { return 0; } // First check most recent balance if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) { return checkpoints[account][nCheckpoints - 1].votes; } // Next check implicit zero balance if (checkpoints[account][0].fromBlock > blockNumber) { return 0; } uint32 lower = 0; uint32 upper = nCheckpoints - 1; while (upper > lower) { uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow Checkpoint memory cp = checkpoints[account][center]; if (cp.fromBlock == blockNumber) { return cp.votes; } else if (cp.fromBlock < blockNumber) { lower = center; } else { upper = center - 1; } } return checkpoints[account][lower].votes; } function _delegate(address delegator, address delegatee) internal { /// @notice differs from `_delegate()` in `Comp.sol` to use `delegates` override method to simulate auto-delegation address currentDelegate = delegates(delegator); _delegates[delegator] = delegatee; emit DelegateChanged(delegator, currentDelegate, delegatee); uint96 amount = votesToDelegate(delegator); _moveDelegates(currentDelegate, delegatee, amount); } function _moveDelegates( address srcRep, address dstRep, uint96 amount ) internal { if (srcRep != dstRep && amount > 0) { if (srcRep != address(0)) { uint32 srcRepNum = numCheckpoints[srcRep]; uint96 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0; uint96 srcRepNew = sub96(srcRepOld, amount, 'Community::_moveDelegates: amount underflows'); _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew); } if (dstRep != address(0)) { uint32 dstRepNum = numCheckpoints[dstRep]; uint96 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0; uint96 dstRepNew = add96(dstRepOld, amount, 'Community::_moveDelegates: amount overflows'); _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew); } } } function _writeCheckpoint( address delegatee, uint32 nCheckpoints, uint96 oldVotes, uint96 newVotes ) internal { uint32 blockNumber = safe32( block.number, 'Community::_writeCheckpoint: block number exceeds 32 bits' ); if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) { checkpoints[delegatee][nCheckpoints - 1].votes = newVotes; } else { checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes); numCheckpoints[delegatee] = nCheckpoints + 1; } emit DelegateVotesChanged(delegatee, oldVotes, newVotes); } function safe32(uint256 n, string memory errorMessage) internal pure returns (uint32) { require(n < 2**32, errorMessage); return uint32(n); } function safe96(uint256 n, string memory errorMessage) internal pure returns (uint96) { require(n < 2**96, errorMessage); return uint96(n); } function add96( uint96 a, uint96 b, string memory errorMessage ) internal pure returns (uint96) { uint96 c = a + b; require(c >= a, errorMessage); return c; } function sub96( uint96 a, uint96 b, string memory errorMessage ) internal pure returns (uint96) { require(b <= a, errorMessage); return a - b; } function getChainId() internal view returns (uint256) { uint256 chainId; assembly { chainId := chainid() } return chainId; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); unchecked { _approve(sender, _msgSender(), currentAllowance - amount); } return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(_msgSender(), spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `sender` to `recipient`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[sender] = senderBalance - amount; } _balances[recipient] += amount; emit Transfer(sender, recipient, amount); _afterTokenTransfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens 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 amount ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// 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; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } else if (error == RecoverError.InvalidSignatureV) { revert("ECDSA: invalid signature 'v' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else if (signature.length == 64) { bytes32 r; bytes32 vs; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) vs := mload(add(signature, 0x40)) } return tryRecover(hash, r, vs); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s; uint8 v; assembly { s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) v := add(shr(255, vs), 27) } return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } if (v != 27 && v != 28) { return (address(0), RecoverError.InvalidSignatureV); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./ECDSA.sol"; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712 { /* solhint-disable var-name-mixedcase */ // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to // invalidate the cached domain separator if the chain id changes. bytes32 private immutable _CACHED_DOMAIN_SEPARATOR; uint256 private immutable _CACHED_CHAIN_ID; bytes32 private immutable _HASHED_NAME; bytes32 private immutable _HASHED_VERSION; bytes32 private immutable _TYPE_HASH; /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ constructor(string memory name, string memory version) { bytes32 hashedName = keccak256(bytes(name)); bytes32 hashedVersion = keccak256(bytes(version)); bytes32 typeHash = keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" ); _HASHED_NAME = hashedName; _HASHED_VERSION = hashedVersion; _CACHED_CHAIN_ID = block.chainid; _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion); _TYPE_HASH = typeHash; } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view returns (bytes32) { if (block.chainid == _CACHED_CHAIN_ID) { return _CACHED_DOMAIN_SEPARATOR; } else { return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION); } } function _buildDomainSeparator( bytes32 typeHash, bytes32 nameHash, bytes32 versionHash ) private view returns (bytes32) { return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this))); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash); } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
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[{"inputs":[{"internalType":"uint256","name":"interval","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"responseId","type":"uint256"}],"name":"Collection","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint128","name":"lootId","type":"uint128"},{"indexed":false,"internalType":"uint16","name":"dropped","type":"uint16"}],"name":"Inventory","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"addr","type":"address"},{"internalType":"uint8","name":"idx","type":"uint8"}],"name":"addEdition","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"admins","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"collect","outputs":[{"internalType":"uint16","name":"levels","type":"uint16"},{"internalType":"uint32","name":"experience","type":"uint32"},{"internalType":"uint32","name":"fur","type":"uint32"},{"internalType":"uint128","name":"loot","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"contractURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint128","name":"lootId","type":"uint128"},{"internalType":"uint8","name":"count","type":"uint8"}],"name":"drop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"editions","outputs":[{"internalType":"contract IFurballEdition","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"engine","outputs":[{"internalType":"contract ILootEngine","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint32","name":"snackId","type":"uint32"},{"internalType":"uint16","name":"count","type":"uint16"}],"internalType":"struct FurLib.Feeding[]","name":"feedings","type":"tuple[]"},{"internalType":"address","name":"actor","type":"address"}],"name":"feed","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"fur","outputs":[{"internalType":"contract Fur","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"furballs","outputs":[{"internalType":"uint32","name":"number","type":"uint32"},{"internalType":"uint16","name":"count","type":"uint16"},{"internalType":"uint16","name":"rarity","type":"uint16"},{"internalType":"uint32","name":"experience","type":"uint32"},{"internalType":"uint32","name":"zone","type":"uint32"},{"internalType":"uint16","name":"level","type":"uint16"},{"internalType":"uint16","name":"weight","type":"uint16"},{"internalType":"uint64","name":"birth","type":"uint64"},{"internalType":"uint64","name":"trade","type":"uint64"},{"internalType":"uint64","name":"last","type":"uint64"},{"internalType":"uint32","name":"moves","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"furgreement","outputs":[{"internalType":"contract Furgreement","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":[],"name":"governance","outputs":[{"internalType":"contract Governance","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"intervalDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"isAdmin","outputs":[{"internalType":"bool","name":"","type":"bool"}],"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":[{"internalType":"address","name":"addr","type":"address"}],"name":"isModerator","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"to","type":"address[]"},{"internalType":"uint8","name":"editionIndex","type":"uint8"},{"internalType":"address","name":"actor","type":"address"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"moderators","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint128","name":"lootId","type":"uint128"}],"name":"pickup","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"tokenIds","type":"uint256[]"},{"internalType":"uint32","name":"zone","type":"uint32"},{"internalType":"address","name":"actor","type":"address"}],"name":"playMany","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"},{"internalType":"bool","name":"set","type":"bool"}],"name":"setAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"setEngine","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"furAddress","type":"address"}],"name":"setFur","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"furgAddress","type":"address"}],"name":"setFurgreement","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"setGovernance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"mod","type":"address"},{"internalType":"bool","name":"set","type":"bool"}],"name":"setModerator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bool","name":"contextual","type":"bool"}],"name":"stats","outputs":[{"components":[{"internalType":"uint16","name":"expRate","type":"uint16"},{"internalType":"uint16","name":"furRate","type":"uint16"},{"components":[{"internalType":"uint16","name":"expPercent","type":"uint16"},{"internalType":"uint16","name":"furPercent","type":"uint16"},{"internalType":"uint16","name":"luckPercent","type":"uint16"},{"internalType":"uint16","name":"happinessPoints","type":"uint16"},{"internalType":"uint16","name":"energyPoints","type":"uint16"},{"internalType":"uint32","name":"zone","type":"uint32"}],"internalType":"struct FurLib.RewardModifiers","name":"modifiers","type":"tuple"},{"components":[{"internalType":"uint32","name":"number","type":"uint32"},{"internalType":"uint16","name":"count","type":"uint16"},{"internalType":"uint16","name":"rarity","type":"uint16"},{"internalType":"uint32","name":"experience","type":"uint32"},{"internalType":"uint32","name":"zone","type":"uint32"},{"internalType":"uint16","name":"level","type":"uint16"},{"internalType":"uint16","name":"weight","type":"uint16"},{"internalType":"uint64","name":"birth","type":"uint64"},{"internalType":"uint64","name":"trade","type":"uint64"},{"internalType":"uint64","name":"last","type":"uint64"},{"internalType":"uint32","name":"moves","type":"uint32"},{"internalType":"uint256[]","name":"inventory","type":"uint256[]"}],"internalType":"struct FurLib.Furball","name":"definition","type":"tuple"},{"components":[{"internalType":"uint32","name":"snackId","type":"uint32"},{"internalType":"uint32","name":"duration","type":"uint32"},{"internalType":"uint16","name":"furCost","type":"uint16"},{"internalType":"uint16","name":"happiness","type":"uint16"},{"internalType":"uint16","name":"energy","type":"uint16"},{"internalType":"uint16","name":"count","type":"uint16"},{"internalType":"uint64","name":"fed","type":"uint64"}],"internalType":"struct FurLib.Snack[]","name":"snacks","type":"tuple[]"}],"internalType":"struct FurLib.FurballStats","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint128","name":"lootId","type":"uint128"},{"internalType":"uint8","name":"chances","type":"uint8"},{"internalType":"address","name":"actor","type":"address"}],"name":"upgrade","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000000000000000000000000000000000000000000e10
-----Decoded View---------------
Arg [0] : interval (uint256): 3600
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000e10
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