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ERC-721
Overview
Max Total Supply
411 INFT
Holders
312
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
3 INFTLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
DexfaiINFT
Compiler Version
v0.8.19+commit.7dd6d404
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity ^0.8.19; import "DexfaiPool.sol"; import "ERC721Enumerable.sol"; import "IDexfaiINFT.sol"; import "IERC20.sol"; import "IDexfaiFactory.sol"; import "IWETH.sol"; /** * @title Xfai's Infinity NFT contract * @author Xfai * @notice DexfaiINFT is responsible for minting, boosting, and harvesting INFTs */ contract DexfaiINFT is IDexfaiINFT, ERC721Enumerable { /** * @notice The WETH address. * @dev In the case of a chain ID other than Ethereum, the wrapped ERC20 token address of the chain's native coin */ address private WETH; /** * @notice The ERC20 token used as the underlying token for the INFT */ address private underlyingToken; /** * @notice The Factory address of the DEX */ address private dexfaiFactory; string private baseURI; uint private counter; /** * @notice The reserve of underlyingToken within the INFT contract */ uint public override reserve; /** * @notice Total amount of issued shares */ uint public override totalSharesIssued; /** * @notice Initial reserve set at during deployment. Does count as part of INFT reserve */ uint public override initialReserve; uint private constant NOT_ENTERED = 1; uint private constant ENTERED = 2; uint private status; uint private expectedMints; /** * @notice Mapping from token address to harvested amounts. harvestedBalance shows how much of a token has been harvested so far from the contract. */ mapping(address => uint) public override harvestedBalance; /** * @notice Mapping from token ID to share */ mapping(uint => uint) public override INFTShares; /** * @notice Mapping from token address to token ID to token share */ mapping(address => mapping(uint => uint)) public override sharesHarvestedByPool; /** * @notice Mapping from token address to total share for a token */ mapping(address => uint) public override totalSharesHarvestedByPool; /** * @notice Functions with the onlyOwner modifier can be called only by the factory owner */ modifier onlyOwner() { require(msg.sender == IDexfaiFactory(dexfaiFactory).getOwner(), 'DexfaiINFT: NOT_OWNER'); _; } /** * @notice Functions with the lock modifier can be called only once within a transaction */ modifier lock() { require(status != ENTERED, 'DexfaiINFT: REENTRANT_CALL'); status = ENTERED; _; status = NOT_ENTERED; } /** * @notice Construct Xfai's DEX Factory * @param _dexfaiFactory The address of the DexfaiFactory contract * @param _underlyingToken The address of the ERC20 token used as the underlying token for the INFT * @param _initialReserve The initial reserve used during deployment * @param _expectedMints The number of pre-mints before minting is available */ constructor( address _dexfaiFactory, address _WETH, address _underlyingToken, uint _initialReserve, uint _expectedMints ) ERC721('Infinity-NFT', 'INFT') { status = NOT_ENTERED; dexfaiFactory = _dexfaiFactory; WETH = _WETH; underlyingToken = _underlyingToken; initialReserve = _initialReserve; expectedMints = _expectedMints; totalSharesIssued = 1; // permanently lock one share to prevent zero divisions } receive() external payable { assert(msg.sender == WETH); // only accept ETH via fallback from the WETH contract } /** * @notice preMint is used to mint the legacy NFTs before minting is enabled * @dev Can only be called by the owner * @param _legacyLNFTHolders the address array of the legacy nft holders * @param _initialShares the share array of the legacy nft holders */ function premint( address[] memory _legacyLNFTHolders, uint[] memory _initialShares ) external override onlyOwner { require(counter < expectedMints, 'DexfaiINFT: PREMINTS_ENDED'); require(_initialShares.length == _legacyLNFTHolders.length, 'DexfaiINFT: INVALID_VALUES'); for (uint i = 0; i < _initialShares.length; i++) { counter += 1; _safeMint(_legacyLNFTHolders[i], counter); INFTShares[counter] = _initialShares[i]; totalSharesIssued += _initialShares[i]; } } /** * @notice Function used to set the baseURI of the NFT * @dev setBaseURI can be called only by the contract owner * @param _newBaseURI the new baseURI string for the NFT */ function setBaseURI(string memory _newBaseURI) external override onlyOwner { baseURI = _newBaseURI; } function _baseURI() internal view override returns (string memory) { return baseURI; } /** * @notice Function used to fetch contract states * @return The reserve used during contract initialization, the reserve of the underlying token, and the total number of shares issued */ function getStates() external view override returns (uint, uint, uint) { return (initialReserve, reserve, totalSharesIssued); } /** * @notice Computes the amount of _token fees collected for a given _tokenID * @param _tokenID The token ID of an INFT * @param _token the address of an ERC20 token * @return share2amount The total amount of _token that a given _tokenID can harvest * @return inftShare The share of an INFT * @return harvestedShares The amount of shares harvested for a given pool */ function shareToTokenAmount( uint _tokenID, address _token ) external view override returns (uint share2amount, uint inftShare, uint harvestedShares) { inftShare = INFTShares[_tokenID]; harvestedShares = sharesHarvestedByPool[_token][_tokenID]; uint tokenBalance = IERC20(_token).balanceOf(address(this)); uint share = inftShare - harvestedShares; uint totalShare = totalSharesIssued - totalSharesHarvestedByPool[_token]; share2amount = (tokenBalance * share) / totalShare; // zero divisions not possible } /** * @notice Creates a new INFT, the share of which is determined by the amount of the underlying token sent to the DexfaiFactory * @dev This low-level function should be called from a contract which performs important safety checks * @param _to The address to which the newly minted INFT should be sent to * @return tokenID The id of the newly minted INFT * @return share The share value of the INFT */ function mint(address _to) external override lock returns (uint tokenID, uint share) { require(counter >= expectedMints, 'DexfaiINFT: PREMINTS_ONGOING'); uint amount = IERC20(underlyingToken).balanceOf(dexfaiFactory) - reserve; require(amount != 0, 'DexfaiINFT: INSUFICIENT_AMOUNT'); counter += 1; tokenID = counter; reserve += amount; share = (1e18 * amount) / (reserve + initialReserve); INFTShares[tokenID] = share; totalSharesIssued += share; _safeMint(_to, tokenID); emit Mint(msg.sender, _to, share, tokenID); } /** * @notice Boosts the share value of an INFT, the share of which is determined by the amount of the underlying token sent to the DexfaiFactory * @dev This low-level function should be called from a contract which performs important safety checks * @param _tokenID The token ID of an INFT * @return share The share value added to an INFT */ function boost(uint _tokenID) external override lock returns (uint share) { require(_tokenID <= counter, 'DexfaiINFT: Inexistent_ID'); uint amount = IERC20(underlyingToken).balanceOf(dexfaiFactory) - reserve; require(amount != 0, 'DexfaiINFT: INSUFICIENT_AMOUNT'); reserve += amount; share = (1e18 * amount) / (reserve + initialReserve); INFTShares[_tokenID] += share; totalSharesIssued += share; emit Boost(msg.sender, share, _tokenID); } /** * @notice Harvests the fees (in terms of a given ERC20 token) for a given INFT. * @param _token An ERC20 token address * @param _tokenID The token ID of an INFT * @param _amount The amount of _token to harvest */ function _harvest( address _token, uint _tokenID, uint _amount ) private returns (uint harvestedTokenShare) { require(ownerOf(_tokenID) == msg.sender, 'DexfaiINFT: NOT_INFT_OWNER'); uint tokenBalance = IERC20(_token).balanceOf(address(this)); uint share = INFTShares[_tokenID] - sharesHarvestedByPool[_token][_tokenID]; uint totalShare = totalSharesIssued - totalSharesHarvestedByPool[_token]; uint share2amount = (tokenBalance * share) / totalShare; // zero divisions not possible require(_amount <= share2amount, 'DexfaiINFT: AMOUNT_EXCEEDS_SHARE'); harvestedTokenShare = (share * _amount) / share2amount; sharesHarvestedByPool[_token][_tokenID] += harvestedTokenShare; totalSharesHarvestedByPool[_token] += harvestedTokenShare; harvestedBalance[_token] += _amount; } /** * @notice Harvests INFT fees from the INFT contract * @param _token The address of an ERC20 token * @param _tokenID The ID of the INFT * @param _amount The amount to harvest */ function harvestToken( address _token, uint _tokenID, uint _amount ) external override lock returns (uint) { uint harvestedTokenShare = _harvest(_token, _tokenID, _amount); _safeTransfer(_token, ownerOf(_tokenID), _amount); emit HarvestToken(_token, _amount, harvestedTokenShare, _tokenID); return _amount; } /** * @notice Harvests INFT fees from the INFT contract * @param _tokenID The ID of the INFT * @param _amount The amount to harvest */ function harvestETH(uint _tokenID, uint _amount) external override lock returns (uint) { uint harvestedTokenShare = _harvest(WETH, _tokenID, _amount); IWETH(WETH).withdraw(_amount); _safeTransferETH(ownerOf(_tokenID), _amount); emit HarvestETH(_amount, harvestedTokenShare, _tokenID); return _amount; } function _safeTransfer(address _token, address _to, uint256 _value) internal { require(_token.code.length > 0, 'DexfaiINFT: TRANSFER_FAILED'); (bool success, bytes memory data) = _token.call( abi.encodeWithSelector(IERC20.transfer.selector, _to, _value) ); require( success && (data.length == 0 || abi.decode(data, (bool))), 'DexfaiINFT: TRANSFER_FAILED' ); } function _safeTransferETH(address _to, uint _value) internal { (bool success, ) = _to.call{value: _value}(new bytes(0)); require(success, 'DexfaiINFT: ETH_TRANSFER_FAILED'); } }
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity ^0.8.19; import "IDexfaiPool.sol"; import "IERC20.sol"; import "IDexfaiFactory.sol"; /** * @title Xfai's Dexfai Pools * @author Xfai * @notice DexfaiPool are contracts that get generated by the DexfaiFactory. Every hosted token has one unique pool that holds the state (i.e. pool reserve, balance, weights) for the given token. */ contract DexfaiPool is IDexfaiPool { /** * @notice The ERC20 token name for the LP token */ string public override name; /** * @notice The ERC20 token symbol for the LP token */ string public override symbol; /** * @notice The ERC20 token decimals for the LP token */ uint8 public constant override decimals = 18; /** * @notice Structure to capture time period obervations every 15 minutes, used for local oracles */ struct Observation { uint rCumulative; uint wCumulative; uint timestamp; } /** * @notice The amount of time within a period. * @dev Used to capture oracle reading every 15 minutes */ uint private constant PERIOD_SIZE = 900; /** * @notice The total size of the ring buffer * @dev Stores every PERIOD_SIZE a new record. The buffer can store up to 1 week of data */ uint private constant RING_SIZE = 672; /** * @notice The ring buffer counter * @dev Used to determine the latest index within the ring buffer */ uint public ringBufferNonce = 0; /** * @notice The ring buffer array */ Observation[RING_SIZE] public override observations; /** * @notice The pool reserve */ uint private r; /** * @notice Pool weight * @dev w is used to compute the exchange value of a token */ uint private w; /** * @notice The last block timestamp */ uint private blockTimestampLast; /** * @notice The cumulative reserve value * @dev used to compute TWAPs */ uint private rCumulativeLast; /** * @notice The cumulative w value * @dev used to compute TWAPs */ uint private wCumulativeLast; /** * @notice The total supply of LP tokens */ uint public override totalSupply = 0; uint private seeded = 1; IDexfaiFactory private dexfaiFactory; /** * @notice The ERC20 token address for which the pool was created. Not the same with the LP token address */ address public override poolToken; /** * @notice the domain seperator. Used for permits */ bytes32 public override DOMAIN_SEPARATOR; /** * @notice the permit typehash. Used for permits * @dev keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); */ bytes32 public constant override PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9; /** * @notice mapping used to determine the nonce of an address. Used for permits */ mapping(address => uint) public override nonces; /** * @notice mapping used to determine the allowance of an address for another address */ mapping(address => mapping(address => uint)) public override allowance; /** * @notice mapping used to determine the LP token balance of an address */ mapping(address => uint) public override balanceOf; modifier linked() { address core = getDexfaiCore(); require(msg.sender == core, 'DexfaiPool: NOT_CORE'); _; } /** * @notice Construct the DexfaiPool * @dev The parameters of the pool are omitted in the construct and are instead specified via the initialize function */ constructor() { write(0, 0, block.timestamp); DOMAIN_SEPARATOR = keccak256( abi.encode( keccak256( 'EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)' ), keccak256(bytes(name)), keccak256('1'), block.chainid, address(this) ) ); } // **** Oracle Functions **** /** * @notice Computes the latest index within the ring buffer * @dev The returned index will point at the latest 'empty' position within the ring buffer, i.e. the index for which the time period has not yet been reached * @return index The current index within the price oracle ring bufffer */ function getCurrentIndex() public view override returns (uint16 index) { index = uint16(ringBufferNonce % RING_SIZE); } function write(uint _r, uint _w, uint _blockTimestamp) private returns (uint16 index) { index = getCurrentIndex(); observations[index] = Observation(_r, _w, _blockTimestamp); ringBufferNonce += 1; emit Write(_r, _w, _blockTimestamp); } /** * @notice Fetches the N-th latest stored observation from the ring buffer * @dev E.g. If _n = 1, getNthObservation returns the lastest observation. If _n = 2, getNthObservation returns the previous (2nd lastest) observation * @param _n The N-th observation that one wants to fetch * @return rCumulative The rCumulative of the N-th observation * @return wCumulative The wCumulative of the N-th observation * @return timestamp The timestamp of the N-th observation */ function getNthObservation( uint _n ) public view override returns (uint rCumulative, uint wCumulative, uint timestamp) { require(ringBufferNonce >= _n, 'DexfaiPool: INEXISTENT_HISTORY'); require(_n < RING_SIZE, 'DexfaiPool: OVERRIDDEN_HISTORY'); uint16 index = uint16((ringBufferNonce - _n) % RING_SIZE); Observation memory point = observations[index]; rCumulative = point.rCumulative; wCumulative = point.wCumulative; timestamp = point.timestamp; } /** * @notice Fetches the latest cummulativeLast values of the pool * @return rCumulativeLast The cummulative r of the pool * @return wCumulativeLast The cummulative w of the pool * @return blockTimestampLast The cummulative timestamp of the pool */ function getCumulativeLast() public view override returns (uint, uint, uint) { return (rCumulativeLast, wCumulativeLast, blockTimestampLast); } // **** Pool Functions **** /** * @notice Called once by the factory at time of deployment * @param _token The ERC20 token address of the pool * @param _dexfaiFactory The Dexfai Factory of the pool */ function initialize(address _token, address _dexfaiFactory) external override { require(seeded == 1, 'DexfaiPool: DEX_SEEDED'); poolToken = _token; dexfaiFactory = IDexfaiFactory(_dexfaiFactory); name = string(abi.encodePacked(IERC20(_token).name(), '-Xfai')); symbol = string(abi.encodePacked(IERC20(_token).symbol(), '-Xfai')); seeded = 2; } /** * @notice Get the current Dexfai Core that is allowed to modify the pool state */ function getDexfaiCore() public view override returns (address) { return dexfaiFactory.getDexfaiCore(); } /** * @notice Get the current reserve, weight, and last block timestamp of the pool */ function getStates() external view override returns (uint, uint, uint) { return (r, w, blockTimestampLast); } /** * @notice Updates the reserve and weight. On the first call per block updates cumulative states. * @dev This function is linked. Only the latest Dexfai core can call it * @param _balance The latest balance of the pool * @param _r The latest reserve of the pool * @param _w The latest w weight of the pool */ function update(uint _balance, uint _r, uint _w) external override linked { uint blockTimestamp = block.timestamp; uint timeElapsed = blockTimestamp - blockTimestampLast; if (timeElapsed > 0 && _r != 0) { unchecked { rCumulativeLast += _r * timeElapsed; wCumulativeLast += _w * timeElapsed; } } (, , uint timestamp) = getNthObservation(1); timeElapsed = blockTimestamp - timestamp; // compare the last observation with current timestamp, if greater than 15 minutes, record a new event if (timeElapsed > PERIOD_SIZE && _r != 0) { write(rCumulativeLast, wCumulativeLast, blockTimestamp); } r = _balance; w = _w; blockTimestampLast = blockTimestamp; emit Sync(_balance, _w); } /** * @notice transfer the pool's ERC20 token (not LP token) * @dev This function is linked. Only the latest Dexfai core can call it * @param _token The pool's ERC20 token address * @param _to The recipient of the tokens * @param _value The amount of tokens */ function safeTransfer(address _token, address _to, uint256 _value) external override linked { require(_token.code.length > 0, 'DexfaiPool: TRANSFER_FAILED'); (bool success, bytes memory data) = _token.call( abi.encodeWithSelector(IERC20.transfer.selector, _to, _value) ); require( success && (data.length == 0 || abi.decode(data, (bool))), 'DexfaiPool: TRANSFER_FAILED' ); } // **** ERC20 Functions **** /** * @notice This function mints new ERC20 LP tokens * @dev This function is linked. Only the latest Dexfai core can call it * @param _to The recipient of the tokens * @param _amount The amount of tokens */ function mint(address _to, uint _amount) public override linked { _mint(_to, _amount); } /** * @notice This function burns existing ERC20 LP tokens * @dev This function is linked. Only the latest Dexfai core can call it * @param _to The recipient whose tokens get burned * @param _amount The amount of tokens burned */ function burn(address _to, uint _amount) public override linked { _burn(_to, _amount); } function _mint(address _dst, uint _amount) internal { totalSupply += _amount; balanceOf[_dst] += _amount; emit Transfer(address(0), _dst, _amount); } function _burn(address _dst, uint _amount) internal { totalSupply -= _amount; balanceOf[_dst] -= _amount; emit Transfer(_dst, address(0), _amount); } /** * @notice The ERC20 standard approve function */ function approve(address _spender, uint _amount) external override returns (bool) { allowance[msg.sender][_spender] = _amount; emit Approval(msg.sender, _spender, _amount); return true; } /** * @notice The ERC20 standard permit function */ function permit( address _owner, address _spender, uint _value, uint _deadline, uint8 _v, bytes32 _r, bytes32 _s ) external override { require(_deadline >= block.timestamp, 'DexfaiPool: EXPIRED'); bytes32 digest = keccak256( abi.encodePacked( '\x19\x01', DOMAIN_SEPARATOR, keccak256( abi.encode(PERMIT_TYPEHASH, _owner, _spender, _value, nonces[_owner]++, _deadline) ) ) ); address recoveredAddress = ecrecover(digest, _v, _r, _s); require(recoveredAddress != address(0), 'DexfaiPool: INVALID_SIGNATURE'); require(recoveredAddress == _owner, 'DexfaiPool: INVALID_SIGNATURE'); allowance[_owner][_spender] = _value; emit Approval(_owner, _spender, _value); } /** * @notice The ERC20 standard transfer function */ function transfer(address _dst, uint _amount) external override returns (bool) { _transferTokens(msg.sender, _dst, _amount); return true; } /** * @notice The ERC20 standard transferFrom function */ function transferFrom(address _src, address _dst, uint _amount) external override returns (bool) { address spender = msg.sender; uint spenderAllowance = allowance[_src][spender]; if (spender != _src && spenderAllowance != type(uint).max) { uint newAllowance = spenderAllowance - _amount; allowance[_src][spender] = newAllowance; emit Approval(_src, spender, newAllowance); } _transferTokens(_src, _dst, _amount); return true; } function _transferTokens(address _src, address _dst, uint _amount) internal { balanceOf[_src] -= _amount; balanceOf[_dst] += _amount; emit Transfer(_src, _dst, _amount); } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity ^0.8.19; interface IDexfaiPool { function getCurrentIndex() external view returns (uint16 index); function getNthObservation( uint _n ) external view returns (uint timestamp, uint rCumulative, uint wCumulative); function getCumulativeLast() external view returns (uint timestamp, uint rCumulative, uint wCumulative); function ringBufferNonce() external view returns (uint); function observations(uint observation) external view returns (uint, uint, uint); function getDexfaiCore() external view returns (address); function poolToken() external view returns (address); function initialize(address _token, address _dexfaiFactory) external; function getStates() external view returns (uint, uint, uint); function update(uint _balance, uint _r, uint _w) external; function mint(address _to, uint _amount) external; function burn(address _to, uint _amount) external; function safeTransfer(address _token, address _to, uint256 _value) external; function totalSupply() external view returns (uint); function transfer(address _recipient, uint _amount) external returns (bool); function decimals() external view returns (uint8); function balanceOf(address) external view returns (uint); function transferFrom(address _sender, address _recipient, uint _amount) external returns (bool); function approve(address _spender, uint _value) external returns (bool); function allowance(address _owner, address _spender) external view returns (uint256); function symbol() external view returns (string memory); function name() external view returns (string memory); function permit( address _owner, address _spender, uint _value, uint _deadline, uint8 _v, bytes32 _re, bytes32 _s ) external; function nonces(address _owner) external view returns (uint); function PERMIT_TYPEHASH() external view returns (bytes32); function DOMAIN_SEPARATOR() external view returns (bytes32); event Sync(uint _reserve, uint _w); event Transfer(address indexed _from, address indexed _to, uint _amount); event Approval(address indexed _owner, address indexed _spender, uint _amount); event Write(uint _r, uint _w, uint _blockTimestamp); }
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity ^0.8.19; interface IERC20 { function totalSupply() external view returns (uint); function transfer(address recipient, uint amount) external returns (bool); function decimals() external view returns (uint8); function balanceOf(address) external view returns (uint); function transferFrom(address sender, address recipient, uint amount) external returns (bool); function approve(address spender, uint value) external returns (bool); function allowance(address owner, address spender) external view returns (uint256); function symbol() external view returns (string memory); function name() external view returns (string memory); }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity ^0.8.19; interface IDexfaiFactory { function getPool(address _token) external view returns (address pool); function allPools(uint256) external view returns (address pool); function poolCodeHash() external pure returns (bytes32); function allPoolsLength() external view returns (uint); function createPool(address _token) external returns (address pool); function setDexfaiCore(address _core) external; function getDexfaiCore() external view returns (address); function setOwner(address _owner) external; function setWhitelistingPhase(bool _state) external; function getOwner() external view returns (address); event ChangedOwner(address indexed owner); event ChangedCore(address indexed core); event Whitelisting(bool state); event PoolCreated(address indexed token, address indexed pool, uint allPoolsSize); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol) 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 See {ERC721-_beforeTokenTransfer}. */ function _beforeTokenTransfer( address from, address to, uint256 firstTokenId, uint256 batchSize ) internal virtual override { super._beforeTokenTransfer(from, to, firstTokenId, batchSize); if (batchSize > 1) { // Will only trigger during construction. Batch transferring (minting) is not available afterwards. revert('ERC721Enumerable: consecutive transfers not supported'); } uint256 tokenId = firstTokenId; 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 // OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol) 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: address zero is not a valid owner'); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _ownerOf(tokenId); require(owner != address(0), 'ERC721: invalid token ID'); 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) { _requireMinted(tokenId); 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 overridden 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 token owner or approved for all' ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { _requireMinted(tokenId); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { _setApprovalForAll(_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: caller is not token owner or 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: caller is not token owner or 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 the owner of the `tokenId`. Does NOT revert if token doesn't exist */ function _ownerOf(uint256 tokenId) internal view virtual returns (address) { return _owners[tokenId]; } /** * @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 _ownerOf(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) { address owner = ERC721.ownerOf(tokenId); return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == 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, 1); // Check that tokenId was not minted by `_beforeTokenTransfer` hook require(!_exists(tokenId), 'ERC721: token already minted'); unchecked { // Will not overflow unless all 2**256 token ids are minted to the same owner. // Given that tokens are minted one by one, it is impossible in practice that // this ever happens. Might change if we allow batch minting. // The ERC fails to describe this case. _balances[to] += 1; } _owners[tokenId] = to; emit Transfer(address(0), to, tokenId); _afterTokenTransfer(address(0), to, tokenId, 1); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * This is an internal function that does not check if the sender is authorized to operate on the token. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId, 1); // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook owner = ERC721.ownerOf(tokenId); // Clear approvals delete _tokenApprovals[tokenId]; unchecked { // Cannot overflow, as that would require more tokens to be burned/transferred // out than the owner initially received through minting and transferring in. _balances[owner] -= 1; } delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); _afterTokenTransfer(owner, address(0), tokenId, 1); } /** * @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 from incorrect owner'); require(to != address(0), 'ERC721: transfer to the zero address'); _beforeTokenTransfer(from, to, tokenId, 1); // Check that tokenId was not transferred by `_beforeTokenTransfer` hook require(ERC721.ownerOf(tokenId) == from, 'ERC721: transfer from incorrect owner'); // Clear approvals from the previous owner delete _tokenApprovals[tokenId]; unchecked { // `_balances[from]` cannot overflow for the same reason as described in `_burn`: // `from`'s balance is the number of token held, which is at least one before the current // transfer. // `_balances[to]` could overflow in the conditions described in `_mint`. That would require // all 2**256 token ids to be minted, which in practice is impossible. _balances[from] -= 1; _balances[to] += 1; } _owners[tokenId] = to; emit Transfer(from, to, tokenId); _afterTokenTransfer(from, to, tokenId, 1); } /** * @dev Approve `to` to operate on `tokenId` * * Emits an {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(ERC721.ownerOf(tokenId), to, tokenId); } /** * @dev Approve `operator` to operate on all of `owner` tokens * * Emits an {ApprovalForAll} event. */ function _setApprovalForAll(address owner, address operator, bool approved) internal virtual { require(owner != operator, 'ERC721: approve to caller'); _operatorApprovals[owner][operator] = approved; emit ApprovalForAll(owner, operator, approved); } /** * @dev Reverts if the `tokenId` has not been minted yet. */ function _requireMinted(uint256 tokenId) internal view virtual { require(_exists(tokenId), 'ERC721: invalid token ID'); } /** * @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 { /// @solidity memory-safe-assembly assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`. * - When `from` is zero, the tokens will be minted for `to`. * - When `to` is zero, ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * - `batchSize` is non-zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 /* firstTokenId */, uint256 batchSize ) internal virtual { if (batchSize > 1) { if (from != address(0)) { _balances[from] -= batchSize; } if (to != address(0)) { _balances[to] += batchSize; } } } /** * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`. * - When `from` is zero, the tokens were minted for `to`. * - When `to` is zero, ``from``'s tokens were burned. * - `from` and `to` are never both zero. * - `batchSize` is non-zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 firstTokenId, uint256 batchSize ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol) pragma solidity ^0.8.19; 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`. * * 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; /** * @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 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: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721 * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must * understand this adds an external call which potentially creates a reentrancy vulnerability. * * 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 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 the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol) pragma solidity ^0.8.19; /** * @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 // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol) pragma solidity ^0.8.19; /** * @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 `IERC721Receiver.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol) pragma solidity ^0.8.19; 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 // OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @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 * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 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://consensys.net/diligence/blog/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 functionCallWithValue(target, data, 0, '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'); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), 'Address: call to non-contract'); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or 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 { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // 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 /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) 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 // OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol) pragma solidity ^0.8.0; import "OZMath.sol"; /** * @dev String operations. */ library Strings { bytes16 private constant _SYMBOLS = '0123456789abcdef'; uint8 private constant _ADDRESS_LENGTH = 20; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { unchecked { uint256 length = OZMath.log10(value) + 1; string memory buffer = new string(length); uint256 ptr; /// @solidity memory-safe-assembly assembly { ptr := add(buffer, add(32, length)) } while (true) { ptr--; /// @solidity memory-safe-assembly assembly { mstore8(ptr, byte(mod(value, 10), _SYMBOLS)) } value /= 10; if (value == 0) break; } return buffer; } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { unchecked { return toHexString(value, OZMath.log256(value) + 1); } } /** * @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] = _SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, 'Strings: hex length insufficient'); return string(buffer); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library OZMath { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10 ** 64) { value /= 10 ** 64; result += 64; } if (value >= 10 ** 32) { value /= 10 ** 32; result += 32; } if (value >= 10 ** 16) { value /= 10 ** 16; result += 16; } if (value >= 10 ** 8) { value /= 10 ** 8; result += 8; } if (value >= 10 ** 4) { value /= 10 ** 4; result += 4; } if (value >= 10 ** 2) { value /= 10 ** 2; result += 2; } if (value >= 10 ** 1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol) 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 // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol) pragma solidity ^0.8.19; 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); /** * @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: GPL-3.0-only pragma solidity ^0.8.19; interface IDexfaiINFT { function reserve() external view returns (uint); function totalSharesIssued() external view returns (uint); function initialReserve() external view returns (uint); function harvestedBalance(address _token) external view returns (uint); function INFTShares(uint _id) external view returns (uint); function sharesHarvestedByPool(address _token, uint _id) external view returns (uint); function totalSharesHarvestedByPool(address _token) external view returns (uint); function setBaseURI(string memory _baseURI) external; function getStates() external view returns (uint, uint, uint); function shareToTokenAmount( uint _tokenID, address _token ) external view returns (uint share2amount, uint inftShare, uint harvestedShares); function premint(address[] memory _legacyLNFTHolders, uint[] memory _initialShares) external; function mint(address _to) external returns (uint tokenID, uint share); function boost(uint _tokenID) external returns (uint share); function harvestToken(address _token, uint _tokenID, uint _amount) external returns (uint); function harvestETH(uint _tokenID, uint _amount) external returns (uint); event Mint(address indexed from, address indexed to, uint share, uint id); event Boost(address indexed from, uint share, uint id); event HarvestToken(address token, uint harvestedAmount, uint harvestedShare, uint id); event HarvestETH(uint harvestedAmount, uint harvestedShare, uint id); }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity ^0.8.19; interface IWETH { function deposit() external payable; function transfer(address to, uint value) external returns (bool); function withdraw(uint) external; }
{ "evmVersion": "london", "optimizer": { "enabled": true, "runs": 200 }, "libraries": { "DexfaiINFT.sol": {} }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
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bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"}],"name":"mint","outputs":[{"internalType":"uint256","name":"tokenID","type":"uint256"},{"internalType":"uint256","name":"share","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"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":"address[]","name":"_legacyLNFTHolders","type":"address[]"},{"internalType":"uint256[]","name":"_initialShares","type":"uint256[]"}],"name":"premint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"reserve","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":"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":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_newBaseURI","type":"string"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenID","type":"uint256"},{"internalType":"address","name":"_token","type":"address"}],"name":"shareToTokenAmount","outputs":[{"internalType":"uint256","name":"share2amount","type":"uint256"},{"internalType":"uint256","name":"inftShare","type":"uint256"},{"internalType":"uint256","name":"harvestedShares","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"sharesHarvestedByPool","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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":[{"internalType":"address","name":"","type":"address"}],"name":"totalSharesHarvestedByPool","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSharesIssued","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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"},{"stateMutability":"payable","type":"receive"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000ee9c77cc985dcc4fd81e7804ce4c2f380430c333000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc20000000000000000000000004aa41bc1649c9c3177ed16caaa11482295fc744100000000000000000000000000000000000000000031a17e847807b1bc0000000000000000000000000000000000000000000000000000000000000000000194
-----Decoded View---------------
Arg [0] : _dexfaiFactory (address): 0xEe9c77Cc985dcC4fd81e7804ce4C2f380430C333
Arg [1] : _WETH (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [2] : _underlyingToken (address): 0x4aa41bC1649C9C3177eD16CaaA11482295fC7441
Arg [3] : _initialReserve (uint256): 60000000000000000000000000
Arg [4] : _expectedMints (uint256): 404
-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000ee9c77cc985dcc4fd81e7804ce4c2f380430c333
Arg [1] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [2] : 0000000000000000000000004aa41bc1649c9c3177ed16caaa11482295fc7441
Arg [3] : 00000000000000000000000000000000000000000031a17e847807b1bc000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000194
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