ERC-20
Gaming
Overview
Max Total Supply
1,578,659,482.119909666511303424 WOOL
Holders
7,054 (0.00%)
Market
Price
$0.00 @ 0.000000 ETH (-5.13%)
Onchain Market Cap
$2,100,816.89
Circulating Supply Market Cap
$0.00
Other Info
Token Contract (WITH 18 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
WOOL
Compiler Version
v0.8.7+commit.e28d00a7
Contract Source Code (Solidity Multiple files format)
// SPDX-License-Identifier: MIT LICENSE pragma solidity ^0.8.0; import "./ERC20.sol"; import "./Ownable.sol"; contract WOOL is ERC20, Ownable { // a mapping from an address to whether or not it can mint / burn mapping(address => bool) controllers; constructor() ERC20("WOOL", "WOOL") { } /** * mints $WOOL to a recipient * @param to the recipient of the $WOOL * @param amount the amount of $WOOL to mint */ function mint(address to, uint256 amount) external { require(controllers[msg.sender], "Only controllers can mint"); _mint(to, amount); } /** * burns $WOOL from a holder * @param from the holder of the $WOOL * @param amount the amount of $WOOL to burn */ function burn(address from, uint256 amount) external { require(controllers[msg.sender], "Only controllers can burn"); _burn(from, amount); } /** * enables an address to mint / burn * @param controller the address to enable */ function addController(address controller) external onlyOwner { controllers[controller] = true; } /** * disables an address from minting / burning * @param controller the address to disbale */ function removeController(address controller) external onlyOwner { controllers[controller] = false; } }
// 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 LICENSE pragma solidity ^0.8.0; import "./IERC721Receiver.sol"; import "./Pausable.sol"; import "./Woolf.sol"; import "./WOOL.sol"; contract Barn is Ownable, IERC721Receiver, Pausable { // maximum alpha score for a Wolf uint8 public constant MAX_ALPHA = 8; // struct to store a stake's token, owner, and earning values struct Stake { uint16 tokenId; uint80 value; address owner; } event TokenStaked(address owner, uint256 tokenId, uint256 value); event SheepClaimed(uint256 tokenId, uint256 earned, bool unstaked); event WolfClaimed(uint256 tokenId, uint256 earned, bool unstaked); // reference to the Woolf NFT contract Woolf woolf; // reference to the $WOOL contract for minting $WOOL earnings WOOL wool; // maps tokenId to stake mapping(uint256 => Stake) public barn; // maps alpha to all Wolf stakes with that alpha mapping(uint256 => Stake[]) public pack; // tracks location of each Wolf in Pack mapping(uint256 => uint256) public packIndices; // total alpha scores staked uint256 public totalAlphaStaked = 0; // any rewards distributed when no wolves are staked uint256 public unaccountedRewards = 0; // amount of $WOOL due for each alpha point staked uint256 public woolPerAlpha = 0; // sheep earn 10000 $WOOL per day uint256 public constant DAILY_WOOL_RATE = 10000 ether; // sheep must have 2 days worth of $WOOL to unstake or else it's too cold uint256 public constant MINIMUM_TO_EXIT = 2 days; // wolves take a 20% tax on all $WOOL claimed uint256 public constant WOOL_CLAIM_TAX_PERCENTAGE = 20; // there will only ever be (roughly) 2.4 billion $WOOL earned through staking uint256 public constant MAXIMUM_GLOBAL_WOOL = 2400000000 ether; // amount of $WOOL earned so far uint256 public totalWoolEarned; // number of Sheep staked in the Barn uint256 public totalSheepStaked; // the last time $WOOL was claimed uint256 public lastClaimTimestamp; // emergency rescue to allow unstaking without any checks but without $WOOL bool public rescueEnabled = false; /** * @param _woolf reference to the Woolf NFT contract * @param _wool reference to the $WOOL token */ constructor(address _woolf, address _wool) { woolf = Woolf(_woolf); wool = WOOL(_wool); } /** STAKING */ /** * adds Sheep and Wolves to the Barn and Pack * @param account the address of the staker * @param tokenIds the IDs of the Sheep and Wolves to stake */ function addManyToBarnAndPack(address account, uint16[] calldata tokenIds) external { require(account == _msgSender() || _msgSender() == address(woolf), "DONT GIVE YOUR TOKENS AWAY"); for (uint i = 0; i < tokenIds.length; i++) { if (_msgSender() != address(woolf)) { // dont do this step if its a mint + stake require(woolf.ownerOf(tokenIds[i]) == _msgSender(), "AINT YO TOKEN"); woolf.transferFrom(_msgSender(), address(this), tokenIds[i]); } else if (tokenIds[i] == 0) { continue; // there may be gaps in the array for stolen tokens } if (isSheep(tokenIds[i])) _addSheepToBarn(account, tokenIds[i]); else _addWolfToPack(account, tokenIds[i]); } } /** * adds a single Sheep to the Barn * @param account the address of the staker * @param tokenId the ID of the Sheep to add to the Barn */ function _addSheepToBarn(address account, uint256 tokenId) internal whenNotPaused _updateEarnings { barn[tokenId] = Stake({ owner: account, tokenId: uint16(tokenId), value: uint80(block.timestamp) }); totalSheepStaked += 1; emit TokenStaked(account, tokenId, block.timestamp); } /** * adds a single Wolf to the Pack * @param account the address of the staker * @param tokenId the ID of the Wolf to add to the Pack */ function _addWolfToPack(address account, uint256 tokenId) internal { uint256 alpha = _alphaForWolf(tokenId); totalAlphaStaked += alpha; // Portion of earnings ranges from 8 to 5 packIndices[tokenId] = pack[alpha].length; // Store the location of the wolf in the Pack pack[alpha].push(Stake({ owner: account, tokenId: uint16(tokenId), value: uint80(woolPerAlpha) })); // Add the wolf to the Pack emit TokenStaked(account, tokenId, woolPerAlpha); } /** CLAIMING / UNSTAKING */ /** * realize $WOOL earnings and optionally unstake tokens from the Barn / Pack * to unstake a Sheep it will require it has 2 days worth of $WOOL unclaimed * @param tokenIds the IDs of the tokens to claim earnings from * @param unstake whether or not to unstake ALL of the tokens listed in tokenIds */ function claimManyFromBarnAndPack(uint16[] calldata tokenIds, bool unstake) external whenNotPaused _updateEarnings { uint256 owed = 0; for (uint i = 0; i < tokenIds.length; i++) { if (isSheep(tokenIds[i])) owed += _claimSheepFromBarn(tokenIds[i], unstake); else owed += _claimWolfFromPack(tokenIds[i], unstake); } if (owed == 0) return; wool.mint(_msgSender(), owed); } /** * realize $WOOL earnings for a single Sheep and optionally unstake it * if not unstaking, pay a 20% tax to the staked Wolves * if unstaking, there is a 50% chance all $WOOL is stolen * @param tokenId the ID of the Sheep to claim earnings from * @param unstake whether or not to unstake the Sheep * @return owed - the amount of $WOOL earned */ function _claimSheepFromBarn(uint256 tokenId, bool unstake) internal returns (uint256 owed) { Stake memory stake = barn[tokenId]; require(stake.owner == _msgSender(), "SWIPER, NO SWIPING"); require(!(unstake && block.timestamp - stake.value < MINIMUM_TO_EXIT), "GONNA BE COLD WITHOUT TWO DAY'S WOOL"); if (totalWoolEarned < MAXIMUM_GLOBAL_WOOL) { owed = (block.timestamp - stake.value) * DAILY_WOOL_RATE / 1 days; } else if (stake.value > lastClaimTimestamp) { owed = 0; // $WOOL production stopped already } else { owed = (lastClaimTimestamp - stake.value) * DAILY_WOOL_RATE / 1 days; // stop earning additional $WOOL if it's all been earned } if (unstake) { if (random(tokenId) & 1 == 1) { // 50% chance of all $WOOL stolen _payWolfTax(owed); owed = 0; } woolf.safeTransferFrom(address(this), _msgSender(), tokenId, ""); // send back Sheep delete barn[tokenId]; totalSheepStaked -= 1; } else { _payWolfTax(owed * WOOL_CLAIM_TAX_PERCENTAGE / 100); // percentage tax to staked wolves owed = owed * (100 - WOOL_CLAIM_TAX_PERCENTAGE) / 100; // remainder goes to Sheep owner barn[tokenId] = Stake({ owner: _msgSender(), tokenId: uint16(tokenId), value: uint80(block.timestamp) }); // reset stake } emit SheepClaimed(tokenId, owed, unstake); } /** * realize $WOOL earnings for a single Wolf and optionally unstake it * Wolves earn $WOOL proportional to their Alpha rank * @param tokenId the ID of the Wolf to claim earnings from * @param unstake whether or not to unstake the Wolf * @return owed - the amount of $WOOL earned */ function _claimWolfFromPack(uint256 tokenId, bool unstake) internal returns (uint256 owed) { require(woolf.ownerOf(tokenId) == address(this), "AINT A PART OF THE PACK"); uint256 alpha = _alphaForWolf(tokenId); Stake memory stake = pack[alpha][packIndices[tokenId]]; require(stake.owner == _msgSender(), "SWIPER, NO SWIPING"); owed = (alpha) * (woolPerAlpha - stake.value); // Calculate portion of tokens based on Alpha if (unstake) { totalAlphaStaked -= alpha; // Remove Alpha from total staked woolf.safeTransferFrom(address(this), _msgSender(), tokenId, ""); // Send back Wolf Stake memory lastStake = pack[alpha][pack[alpha].length - 1]; pack[alpha][packIndices[tokenId]] = lastStake; // Shuffle last Wolf to current position packIndices[lastStake.tokenId] = packIndices[tokenId]; pack[alpha].pop(); // Remove duplicate delete packIndices[tokenId]; // Delete old mapping } else { pack[alpha][packIndices[tokenId]] = Stake({ owner: _msgSender(), tokenId: uint16(tokenId), value: uint80(woolPerAlpha) }); // reset stake } emit WolfClaimed(tokenId, owed, unstake); } /** * emergency unstake tokens * @param tokenIds the IDs of the tokens to claim earnings from */ function rescue(uint256[] calldata tokenIds) external { require(rescueEnabled, "RESCUE DISABLED"); uint256 tokenId; Stake memory stake; Stake memory lastStake; uint256 alpha; for (uint i = 0; i < tokenIds.length; i++) { tokenId = tokenIds[i]; if (isSheep(tokenId)) { stake = barn[tokenId]; require(stake.owner == _msgSender(), "SWIPER, NO SWIPING"); woolf.safeTransferFrom(address(this), _msgSender(), tokenId, ""); // send back Sheep delete barn[tokenId]; totalSheepStaked -= 1; emit SheepClaimed(tokenId, 0, true); } else { alpha = _alphaForWolf(tokenId); stake = pack[alpha][packIndices[tokenId]]; require(stake.owner == _msgSender(), "SWIPER, NO SWIPING"); totalAlphaStaked -= alpha; // Remove Alpha from total staked woolf.safeTransferFrom(address(this), _msgSender(), tokenId, ""); // Send back Wolf lastStake = pack[alpha][pack[alpha].length - 1]; pack[alpha][packIndices[tokenId]] = lastStake; // Shuffle last Wolf to current position packIndices[lastStake.tokenId] = packIndices[tokenId]; pack[alpha].pop(); // Remove duplicate delete packIndices[tokenId]; // Delete old mapping emit WolfClaimed(tokenId, 0, true); } } } /** ACCOUNTING */ /** * add $WOOL to claimable pot for the Pack * @param amount $WOOL to add to the pot */ function _payWolfTax(uint256 amount) internal { if (totalAlphaStaked == 0) { // if there's no staked wolves unaccountedRewards += amount; // keep track of $WOOL due to wolves return; } // makes sure to include any unaccounted $WOOL woolPerAlpha += (amount + unaccountedRewards) / totalAlphaStaked; unaccountedRewards = 0; } /** * tracks $WOOL earnings to ensure it stops once 2.4 billion is eclipsed */ modifier _updateEarnings() { if (totalWoolEarned < MAXIMUM_GLOBAL_WOOL) { totalWoolEarned += (block.timestamp - lastClaimTimestamp) * totalSheepStaked * DAILY_WOOL_RATE / 1 days; lastClaimTimestamp = block.timestamp; } _; } /** ADMIN */ /** * allows owner to enable "rescue mode" * simplifies accounting, prioritizes tokens out in emergency */ function setRescueEnabled(bool _enabled) external onlyOwner { rescueEnabled = _enabled; } /** * enables owner to pause / unpause minting */ function setPaused(bool _paused) external onlyOwner { if (_paused) _pause(); else _unpause(); } /** READ ONLY */ /** * checks if a token is a Sheep * @param tokenId the ID of the token to check * @return sheep - whether or not a token is a Sheep */ function isSheep(uint256 tokenId) public view returns (bool sheep) { (sheep, , , , , , , , , ) = woolf.tokenTraits(tokenId); } /** * gets the alpha score for a Wolf * @param tokenId the ID of the Wolf to get the alpha score for * @return the alpha score of the Wolf (5-8) */ function _alphaForWolf(uint256 tokenId) internal view returns (uint8) { ( , , , , , , , , , uint8 alphaIndex) = woolf.tokenTraits(tokenId); return MAX_ALPHA - alphaIndex; // alpha index is 0-3 } /** * chooses a random Wolf thief when a newly minted token is stolen * @param seed a random value to choose a Wolf from * @return the owner of the randomly selected Wolf thief */ function randomWolfOwner(uint256 seed) external view returns (address) { if (totalAlphaStaked == 0) return address(0x0); uint256 bucket = (seed & 0xFFFFFFFF) % totalAlphaStaked; // choose a value from 0 to total alpha staked uint256 cumulative; seed >>= 32; // loop through each bucket of Wolves with the same alpha score for (uint i = MAX_ALPHA - 3; i <= MAX_ALPHA; i++) { cumulative += pack[i].length * i; // if the value is not inside of that bucket, keep going if (bucket >= cumulative) continue; // get the address of a random Wolf with that alpha score return pack[i][seed % pack[i].length].owner; } return address(0x0); } /** * generates a pseudorandom number * @param seed a value ensure different outcomes for different sources in the same block * @return a pseudorandom value */ function random(uint256 seed) internal view returns (uint256) { return uint256(keccak256(abi.encodePacked( tx.origin, blockhash(block.number - 1), block.timestamp, seed ))); } function onERC721Received( address, address from, uint256, bytes calldata ) external pure override returns (bytes4) { require(from == address(0x0), "Cannot send tokens to Barn directly"); return IERC721Receiver.onERC721Received.selector; } }
// 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; 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; import "./IERC20.sol"; import "./IERC20Metadata.sol"; import "./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; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "./IERC721Metadata.sol"; import "./Address.sol"; import "./Context.sol"; import "./Strings.sol"; import "./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 "./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 LICENSE pragma solidity ^0.8.0; interface IBarn { function addManyToBarnAndPack(address account, uint16[] calldata tokenIds) external; function randomWolfOwner(uint256 seed) external view returns (address); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev 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; import "./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; 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 "./IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Metadata is IERC721 { /** * @dev Returns the token collection name. */ function name() external view returns (string memory); /** * @dev Returns the token collection symbol. */ function symbol() external view returns (string memory); /** * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token. */ function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ interface IERC721Receiver { /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
// SPDX-License-Identifier: MIT LICENSE pragma solidity ^0.8.0; interface ITraits { function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT LICENSE pragma solidity ^0.8.0; interface IWoolf { // struct to store each token's traits struct SheepWolf { bool isSheep; uint8 fur; uint8 head; uint8 ears; uint8 eyes; uint8 nose; uint8 mouth; uint8 neck; uint8 feet; uint8 alphaIndex; } function getPaidTokens() external view returns (uint256); function getTokenTraits(uint256 tokenId) external view returns (SheepWolf memory); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _setOwner(_msgSender()); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _setOwner(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _setOwner(newOwner); } function _setOwner(address newOwner) private { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./Context.sol"; /** * @dev Contract module which allows children to implement an emergency stop * mechanism that can be triggered by an authorized account. * * This module is used through inheritance. It will make available the * modifiers `whenNotPaused` and `whenPaused`, which can be applied to * the functions of your contract. Note that they will not be pausable by * simply including this module, only once the modifiers are put in place. */ abstract contract Pausable is Context { /** * @dev Emitted when the pause is triggered by `account`. */ event Paused(address account); /** * @dev Emitted when the pause is lifted by `account`. */ event Unpaused(address account); bool private _paused; /** * @dev Initializes the contract in unpaused state. */ constructor() { _paused = false; } /** * @dev Returns true if the contract is paused, and false otherwise. */ function paused() public view virtual returns (bool) { return _paused; } /** * @dev Modifier to make a function callable only when the contract is not paused. * * Requirements: * * - The contract must not be paused. */ modifier whenNotPaused() { require(!paused(), "Pausable: paused"); _; } /** * @dev Modifier to make a function callable only when the contract is paused. * * Requirements: * * - The contract must be paused. */ modifier whenPaused() { require(paused(), "Pausable: not paused"); _; } /** * @dev Triggers stopped state. * * Requirements: * * - The contract must not be paused. */ function _pause() internal virtual whenNotPaused { _paused = true; emit Paused(_msgSender()); } /** * @dev Returns to normal state. * * Requirements: * * - The contract must be paused. */ function _unpause() internal virtual whenPaused { _paused = false; emit Unpaused(_msgSender()); } }
// 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 LICENSE pragma solidity ^0.8.0; import "./Ownable.sol"; import "./Strings.sol"; import "./ITraits.sol"; import "./IWoolf.sol"; contract Traits is Ownable, ITraits { using Strings for uint256; // struct to store each trait's data for metadata and rendering struct Trait { string name; string png; } // mapping from trait type (index) to its name string[9] _traitTypes = [ "Fur", "Head", "Ears", "Eyes", "Nose", "Mouth", "Neck", "Feet", "Alpha" ]; // storage of each traits name and base64 PNG data mapping(uint8 => mapping(uint8 => Trait)) public traitData; // mapping from alphaIndex to its score string[4] _alphas = [ "8", "7", "6", "5" ]; IWoolf public woolf; constructor() {} /** ADMIN */ function setWoolf(address _woolf) external onlyOwner { woolf = IWoolf(_woolf); } /** * administrative to upload the names and images associated with each trait * @param traitType the trait type to upload the traits for (see traitTypes for a mapping) * @param traits the names and base64 encoded PNGs for each trait */ function uploadTraits(uint8 traitType, uint8[] calldata traitIds, Trait[] calldata traits) external onlyOwner { require(traitIds.length == traits.length, "Mismatched inputs"); for (uint i = 0; i < traits.length; i++) { traitData[traitType][traitIds[i]] = Trait( traits[i].name, traits[i].png ); } } /** RENDER */ /** * generates an <image> element using base64 encoded PNGs * @param trait the trait storing the PNG data * @return the <image> element */ function drawTrait(Trait memory trait) internal pure returns (string memory) { return string(abi.encodePacked( '<image x="4" y="4" width="32" height="32" image-rendering="pixelated" preserveAspectRatio="xMidYMid" xlink:href="data:image/png;base64,', trait.png, '"/>' )); } /** * generates an entire SVG by composing multiple <image> elements of PNGs * @param tokenId the ID of the token to generate an SVG for * @return a valid SVG of the Sheep / Wolf */ function drawSVG(uint256 tokenId) public view returns (string memory) { IWoolf.SheepWolf memory s = woolf.getTokenTraits(tokenId); uint8 shift = s.isSheep ? 0 : 9; string memory svgString = string(abi.encodePacked( drawTrait(traitData[0 + shift][s.fur]), s.isSheep ? drawTrait(traitData[1 + shift][s.head]) : drawTrait(traitData[1 + shift][s.alphaIndex]), s.isSheep ? drawTrait(traitData[2 + shift][s.ears]) : '', drawTrait(traitData[3 + shift][s.eyes]), s.isSheep ? drawTrait(traitData[4 + shift][s.nose]) : '', drawTrait(traitData[5 + shift][s.mouth]), s.isSheep ? '' : drawTrait(traitData[6 + shift][s.neck]), s.isSheep ? drawTrait(traitData[7 + shift][s.feet]) : '' )); return string(abi.encodePacked( '<svg id="woolf" width="100%" height="100%" version="1.1" viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">', svgString, "</svg>" )); } /** * generates an attribute for the attributes array in the ERC721 metadata standard * @param traitType the trait type to reference as the metadata key * @param value the token's trait associated with the key * @return a JSON dictionary for the single attribute */ function attributeForTypeAndValue(string memory traitType, string memory value) internal pure returns (string memory) { return string(abi.encodePacked( '{"trait_type":"', traitType, '","value":"', value, '"}' )); } /** * generates an array composed of all the individual traits and values * @param tokenId the ID of the token to compose the metadata for * @return a JSON array of all of the attributes for given token ID */ function compileAttributes(uint256 tokenId) public view returns (string memory) { IWoolf.SheepWolf memory s = woolf.getTokenTraits(tokenId); string memory traits; if (s.isSheep) { traits = string(abi.encodePacked( attributeForTypeAndValue(_traitTypes[0], traitData[0][s.fur].name),',', attributeForTypeAndValue(_traitTypes[1], traitData[1][s.head].name),',', attributeForTypeAndValue(_traitTypes[2], traitData[2][s.ears].name),',', attributeForTypeAndValue(_traitTypes[3], traitData[3][s.eyes].name),',', attributeForTypeAndValue(_traitTypes[4], traitData[4][s.nose].name),',', attributeForTypeAndValue(_traitTypes[5], traitData[5][s.mouth].name),',', attributeForTypeAndValue(_traitTypes[7], traitData[7][s.feet].name),',' )); } else { traits = string(abi.encodePacked( attributeForTypeAndValue(_traitTypes[0], traitData[9][s.fur].name),',', attributeForTypeAndValue(_traitTypes[1], traitData[10][s.alphaIndex].name),',', attributeForTypeAndValue(_traitTypes[3], traitData[12][s.eyes].name),',', attributeForTypeAndValue(_traitTypes[5], traitData[14][s.mouth].name),',', attributeForTypeAndValue(_traitTypes[6], traitData[15][s.neck].name),',', attributeForTypeAndValue("Alpha Score", _alphas[s.alphaIndex]),',' )); } return string(abi.encodePacked( '[', traits, '{"trait_type":"Generation","value":', tokenId <= woolf.getPaidTokens() ? '"Gen 0"' : '"Gen 1"', '},{"trait_type":"Type","value":', s.isSheep ? '"Sheep"' : '"Wolf"', '}]' )); } /** * generates a base64 encoded metadata response without referencing off-chain content * @param tokenId the ID of the token to generate the metadata for * @return a base64 encoded JSON dictionary of the token's metadata and SVG */ function tokenURI(uint256 tokenId) public view override returns (string memory) { IWoolf.SheepWolf memory s = woolf.getTokenTraits(tokenId); string memory metadata = string(abi.encodePacked( '{"name": "', s.isSheep ? 'Sheep #' : 'Wolf #', tokenId.toString(), '", "description": "Thousands of Sheep and Wolves compete on a farm in the metaverse. A tempting prize of $WOOL awaits, with deadly high stakes. All the metadata and images are generated and stored 100% on-chain. No IPFS. NO API. Just the Ethereum blockchain.", "image": "data:image/svg+xml;base64,', base64(bytes(drawSVG(tokenId))), '", "attributes":', compileAttributes(tokenId), "}" )); return string(abi.encodePacked( "data:application/json;base64,", base64(bytes(metadata)) )); } /** BASE 64 - Written by Brech Devos */ string internal constant TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; function base64(bytes memory data) internal pure returns (string memory) { if (data.length == 0) return ''; // load the table into memory string memory table = TABLE; // multiply by 4/3 rounded up uint256 encodedLen = 4 * ((data.length + 2) / 3); // add some extra buffer at the end required for the writing string memory result = new string(encodedLen + 32); assembly { // set the actual output length mstore(result, encodedLen) // prepare the lookup table let tablePtr := add(table, 1) // input ptr let dataPtr := data let endPtr := add(dataPtr, mload(data)) // result ptr, jump over length let resultPtr := add(result, 32) // run over the input, 3 bytes at a time for {} lt(dataPtr, endPtr) {} { dataPtr := add(dataPtr, 3) // read 3 bytes let input := mload(dataPtr) // write 4 characters 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) } // padding with '=' 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 LICENSE pragma solidity ^0.8.0; import "./Ownable.sol"; import "./Pausable.sol"; import "./ERC721Enumerable.sol"; import "./IWoolf.sol"; import "./IBarn.sol"; import "./ITraits.sol"; import "./WOOL.sol"; contract Woolf is IWoolf, ERC721Enumerable, Ownable, Pausable { // mint price uint256 public constant MINT_PRICE = .069420 ether; // max number of tokens that can be minted - 50000 in production uint256 public immutable MAX_TOKENS; // number of tokens that can be claimed for free - 20% of MAX_TOKENS uint256 public PAID_TOKENS; // number of tokens have been minted so far uint16 public minted; // mapping from tokenId to a struct containing the token's traits mapping(uint256 => SheepWolf) public tokenTraits; // mapping from hashed(tokenTrait) to the tokenId it's associated with // used to ensure there are no duplicates mapping(uint256 => uint256) public existingCombinations; // list of probabilities for each trait type // 0 - 9 are associated with Sheep, 10 - 18 are associated with Wolves uint8[][18] public rarities; // list of aliases for Walker's Alias algorithm // 0 - 9 are associated with Sheep, 10 - 18 are associated with Wolves uint8[][18] public aliases; // reference to the Barn for choosing random Wolf thieves IBarn public barn; // reference to $WOOL for burning on mint WOOL public wool; // reference to Traits ITraits public traits; /** * instantiates contract and rarity tables */ constructor(address _wool, address _traits, uint256 _maxTokens) ERC721("Wolf Game", 'WGAME') { wool = WOOL(_wool); traits = ITraits(_traits); MAX_TOKENS = _maxTokens; PAID_TOKENS = _maxTokens / 5; // I know this looks weird but it saves users gas by making lookup O(1) // A.J. Walker's Alias Algorithm // sheep // fur rarities[0] = [15, 50, 200, 250, 255]; aliases[0] = [4, 4, 4, 4, 4]; // head rarities[1] = [190, 215, 240, 100, 110, 135, 160, 185, 80, 210, 235, 240, 80, 80, 100, 100, 100, 245, 250, 255]; aliases[1] = [1, 2, 4, 0, 5, 6, 7, 9, 0, 10, 11, 17, 0, 0, 0, 0, 4, 18, 19, 19]; // ears rarities[2] = [255, 30, 60, 60, 150, 156]; aliases[2] = [0, 0, 0, 0, 0, 0]; // eyes rarities[3] = [221, 100, 181, 140, 224, 147, 84, 228, 140, 224, 250, 160, 241, 207, 173, 84, 254, 220, 196, 140, 168, 252, 140, 183, 236, 252, 224, 255]; aliases[3] = [1, 2, 5, 0, 1, 7, 1, 10, 5, 10, 11, 12, 13, 14, 16, 11, 17, 23, 13, 14, 17, 23, 23, 24, 27, 27, 27, 27]; // nose rarities[4] = [175, 100, 40, 250, 115, 100, 185, 175, 180, 255]; aliases[4] = [3, 0, 4, 6, 6, 7, 8, 8, 9, 9]; // mouth rarities[5] = [80, 225, 227, 228, 112, 240, 64, 160, 167, 217, 171, 64, 240, 126, 80, 255]; aliases[5] = [1, 2, 3, 8, 2, 8, 8, 9, 9, 10, 13, 10, 13, 15, 13, 15]; // neck rarities[6] = [255]; aliases[6] = [0]; // feet rarities[7] = [243, 189, 133, 133, 57, 95, 152, 135, 133, 57, 222, 168, 57, 57, 38, 114, 114, 114, 255]; aliases[7] = [1, 7, 0, 0, 0, 0, 0, 10, 0, 0, 11, 18, 0, 0, 0, 1, 7, 11, 18]; // alphaIndex rarities[8] = [255]; aliases[8] = [0]; // wolves // fur rarities[9] = [210, 90, 9, 9, 9, 150, 9, 255, 9]; aliases[9] = [5, 0, 0, 5, 5, 7, 5, 7, 5]; // head rarities[10] = [255]; aliases[10] = [0]; // ears rarities[11] = [255]; aliases[11] = [0]; // eyes rarities[12] = [135, 177, 219, 141, 183, 225, 147, 189, 231, 135, 135, 135, 135, 246, 150, 150, 156, 165, 171, 180, 186, 195, 201, 210, 243, 252, 255]; aliases[12] = [1, 2, 3, 4, 5, 6, 7, 8, 13, 3, 6, 14, 15, 16, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 26, 26]; // nose rarities[13] = [255]; aliases[13] = [0]; // mouth rarities[14] = [239, 244, 249, 234, 234, 234, 234, 234, 234, 234, 130, 255, 247]; aliases[14] = [1, 2, 11, 0, 11, 11, 11, 11, 11, 11, 11, 11, 11]; // neck rarities[15] = [75, 180, 165, 120, 60, 150, 105, 195, 45, 225, 75, 45, 195, 120, 255]; aliases[15] = [1, 9, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 14, 12, 14]; // feet rarities[16] = [255]; aliases[16] = [0]; // alphaIndex rarities[17] = [8, 160, 73, 255]; aliases[17] = [2, 3, 3, 3]; } /** EXTERNAL */ /** * mint a token - 90% Sheep, 10% Wolves * The first 20% are free to claim, the remaining cost $WOOL */ function mint(uint256 amount, bool stake) external payable whenNotPaused { require(tx.origin == _msgSender(), "Only EOA"); require(minted + amount <= MAX_TOKENS, "All tokens minted"); require(amount > 0 && amount <= 10, "Invalid mint amount"); if (minted < PAID_TOKENS) { require(minted + amount <= PAID_TOKENS, "All tokens on-sale already sold"); require(amount * MINT_PRICE == msg.value, "Invalid payment amount"); } else { require(msg.value == 0); } uint256 totalWoolCost = 0; uint16[] memory tokenIds = stake ? new uint16[](amount) : new uint16[](0); uint256 seed; for (uint i = 0; i < amount; i++) { minted++; seed = random(minted); generate(minted, seed); address recipient = selectRecipient(seed); if (!stake || recipient != _msgSender()) { _safeMint(recipient, minted); } else { _safeMint(address(barn), minted); tokenIds[i] = minted; } totalWoolCost += mintCost(minted); } if (totalWoolCost > 0) wool.burn(_msgSender(), totalWoolCost); if (stake) barn.addManyToBarnAndPack(_msgSender(), tokenIds); } /** * the first 20% are paid in ETH * the next 20% are 20000 $WOOL * the next 40% are 40000 $WOOL * the final 20% are 80000 $WOOL * @param tokenId the ID to check the cost of to mint * @return the cost of the given token ID */ function mintCost(uint256 tokenId) public view returns (uint256) { if (tokenId <= PAID_TOKENS) return 0; if (tokenId <= MAX_TOKENS * 2 / 5) return 20000 ether; if (tokenId <= MAX_TOKENS * 4 / 5) return 40000 ether; return 80000 ether; } function transferFrom( address from, address to, uint256 tokenId ) public virtual override { // Hardcode the Barn's approval so that users don't have to waste gas approving if (_msgSender() != address(barn)) require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _transfer(from, to, tokenId); } /** INTERNAL */ /** * generates traits for a specific token, checking to make sure it's unique * @param tokenId the id of the token to generate traits for * @param seed a pseudorandom 256 bit number to derive traits from * @return t - a struct of traits for the given token ID */ function generate(uint256 tokenId, uint256 seed) internal returns (SheepWolf memory t) { t = selectTraits(seed); if (existingCombinations[structToHash(t)] == 0) { tokenTraits[tokenId] = t; existingCombinations[structToHash(t)] = tokenId; return t; } return generate(tokenId, random(seed)); } /** * uses A.J. Walker's Alias algorithm for O(1) rarity table lookup * ensuring O(1) instead of O(n) reduces mint cost by more than 50% * probability & alias tables are generated off-chain beforehand * @param seed portion of the 256 bit seed to remove trait correlation * @param traitType the trait type to select a trait for * @return the ID of the randomly selected trait */ function selectTrait(uint16 seed, uint8 traitType) internal view returns (uint8) { uint8 trait = uint8(seed) % uint8(rarities[traitType].length); if (seed >> 8 < rarities[traitType][trait]) return trait; return aliases[traitType][trait]; } /** * the first 20% (ETH purchases) go to the minter * the remaining 80% have a 10% chance to be given to a random staked wolf * @param seed a random value to select a recipient from * @return the address of the recipient (either the minter or the Wolf thief's owner) */ function selectRecipient(uint256 seed) internal view returns (address) { if (minted <= PAID_TOKENS || ((seed >> 245) % 10) != 0) return _msgSender(); // top 10 bits haven't been used address thief = barn.randomWolfOwner(seed >> 144); // 144 bits reserved for trait selection if (thief == address(0x0)) return _msgSender(); return thief; } /** * selects the species and all of its traits based on the seed value * @param seed a pseudorandom 256 bit number to derive traits from * @return t - a struct of randomly selected traits */ function selectTraits(uint256 seed) internal view returns (SheepWolf memory t) { t.isSheep = (seed & 0xFFFF) % 10 != 0; uint8 shift = t.isSheep ? 0 : 9; seed >>= 16; t.fur = selectTrait(uint16(seed & 0xFFFF), 0 + shift); seed >>= 16; t.head = selectTrait(uint16(seed & 0xFFFF), 1 + shift); seed >>= 16; t.ears = selectTrait(uint16(seed & 0xFFFF), 2 + shift); seed >>= 16; t.eyes = selectTrait(uint16(seed & 0xFFFF), 3 + shift); seed >>= 16; t.nose = selectTrait(uint16(seed & 0xFFFF), 4 + shift); seed >>= 16; t.mouth = selectTrait(uint16(seed & 0xFFFF), 5 + shift); seed >>= 16; t.neck = selectTrait(uint16(seed & 0xFFFF), 6 + shift); seed >>= 16; t.feet = selectTrait(uint16(seed & 0xFFFF), 7 + shift); seed >>= 16; t.alphaIndex = selectTrait(uint16(seed & 0xFFFF), 8 + shift); } /** * converts a struct to a 256 bit hash to check for uniqueness * @param s the struct to pack into a hash * @return the 256 bit hash of the struct */ function structToHash(SheepWolf memory s) internal pure returns (uint256) { return uint256(bytes32( abi.encodePacked( s.isSheep, s.fur, s.head, s.eyes, s.mouth, s.neck, s.ears, s.feet, s.alphaIndex ) )); } /** * generates a pseudorandom number * @param seed a value ensure different outcomes for different sources in the same block * @return a pseudorandom value */ function random(uint256 seed) internal view returns (uint256) { return uint256(keccak256(abi.encodePacked( tx.origin, blockhash(block.number - 1), block.timestamp, seed ))); } /** READ */ function getTokenTraits(uint256 tokenId) external view override returns (SheepWolf memory) { return tokenTraits[tokenId]; } function getPaidTokens() external view override returns (uint256) { return PAID_TOKENS; } /** ADMIN */ /** * called after deployment so that the contract can get random wolf thieves * @param _barn the address of the Barn */ function setBarn(address _barn) external onlyOwner { barn = IBarn(_barn); } /** * allows owner to withdraw funds from minting */ function withdraw() external onlyOwner { payable(owner()).transfer(address(this).balance); } /** * updates the number of tokens for sale */ function setPaidTokens(uint256 _paidTokens) external onlyOwner { PAID_TOKENS = _paidTokens; } /** * enables owner to pause / unpause minting */ function setPaused(bool _paused) external onlyOwner { if (_paused) _pause(); else _unpause(); } /** RENDER */ function tokenURI(uint256 tokenId) public view override returns (string memory) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); return traits.tokenURI(tokenId); } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Swarm Source
ipfs://10e740239ccd08bc9391399fdcda3262148860fd9e4f003e38f4318f7cb1028b
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