Address Details
contract
token
0xb70b639f29C45882b4c39e7611d2BA8E171dc561
- Token
- Kolor Land NFT (KLand)
- Creator
- 0xf600c2–fea2f2 at 0xa0056a–2b89a1
- Balance
- 0 CELO ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
Fetching tokens...
- Transactions
- 18 Transactions
- Transfers
- 0 Transfers
- Gas Used
- 7,382,598
- Last Balance Update
- 11245989
This contract has been verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- KolorLandNFT
- Optimization enabled
- true
- Compiler version
- v0.8.0+commit.c7dfd78e
- Optimization runs
- 50
- EVM Version
- istanbul
- Verified at
- 2022-04-30T17:37:04.106187Z
project:/contracts/KolorLandNFT.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0; import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/utils/Counters.sol"; import "./IKolorLandNFT.sol"; struct GeoSpatialPoint { int256 latitude; int256 longitude; uint256 decimals; uint256 creationDate; uint256 updateDate; } struct Species { string speciesAlias; string scientificName; uint256 density; uint256 size; uint256 decimals; uint256 TCO2perSecond; uint256 TCO2perYear; uint256 landId; uint256 creationDate; uint256 updateDate; } struct NFTInfo { string name; string identifier; address landOwner; string landOwnerAlias; uint256 decimals; uint256 size; string country; string stateOrRegion; string city; State state; uint256 initialTCO2perYear; uint256 soldTCO2; uint256 creationDate; } contract KolorLandNFT is ERC721, ERC721Enumerable, ERC721Burnable, Ownable, IKolorLandNFT { using Counters for Counters.Counter; Counters.Counter private _tokenIdCounter; address public marketplace; constructor() ERC721("Kolor Land NFT", "KLand") { isAuthorized[msg.sender] = true; } string public baseURI; // NFT info mapping(uint256 => NFTInfo) private mintedNFTSInfo; // Owned lands to use in enumeration mapping(address => mapping(uint256 => uint256)) private ownedLands; mapping(uint256 => uint256) private landIndex; mapping(address => uint256) private _totalLandOwned; // mapping to get buyers of a land mapping(uint256 => mapping(address => bool)) public buyers; mapping(uint256 => uint256) public totalBuyers; // mappings of conflictive data such as species and location mapping(uint256 => mapping(uint256 => Species)) public species; mapping(uint256 => uint256) public totalSpecies; mapping(uint256 => mapping(uint256 => GeoSpatialPoint)) public points; mapping(uint256 => uint256) public totalPoints; mapping(address => bool) public isAuthorized; function safeMint( address to, string memory name, string memory identifier, address landOwner, string memory landOwnerAlias, uint256 decimals, uint256 size, string memory country, string memory stateOrRegion, string memory city, uint256 initialTCO2 ) public onlyAuthorized { uint256 currentTokenId = _tokenIdCounter.current(); _tokenIdCounter.increment(); _safeMint(to, currentTokenId); // Set all NFT information mintedNFTSInfo[currentTokenId].name = name; mintedNFTSInfo[currentTokenId].identifier = identifier; mintedNFTSInfo[currentTokenId].landOwner = landOwner; mintedNFTSInfo[currentTokenId].landOwnerAlias = landOwnerAlias; mintedNFTSInfo[currentTokenId].decimals = decimals; mintedNFTSInfo[currentTokenId].size = size; mintedNFTSInfo[currentTokenId].country = country; mintedNFTSInfo[currentTokenId].stateOrRegion = stateOrRegion; mintedNFTSInfo[currentTokenId].city = city; mintedNFTSInfo[currentTokenId].initialTCO2perYear = initialTCO2; mintedNFTSInfo[currentTokenId].creationDate = block.timestamp; mintedNFTSInfo[currentTokenId].state = State.Created; uint256 _landsOwned = _totalLandOwned[landOwner]; // set the tokenId to current landowner collection index ownedLands[to][_landsOwned] = currentTokenId; // update the tokenId index in landowner collection landIndex[currentTokenId] = _landsOwned; // increase total lands owned by address _totalLandOwned[to]++; } function authorize(address manager) public onlyOwner { isAuthorized[manager] = !isAuthorized[manager]; } function setMarketplace(address _marketplace) public onlyAuthorized { marketplace = _marketplace; isAuthorized[marketplace] = true; } modifier onlyMarketplace() { require( marketplace == msg.sender, "Kolor Land NFT: You're not allowed to do that!" ); _; } modifier onlyAuthorized() { require( isAuthorized[msg.sender], "Kolor Land NFT: You're not allowed to do that!" ); _; } modifier notBurned(uint256 tokenId) { require(_exists(tokenId), "ERC721Metadata: operation on burned token!"); _; } modifier notPublishedNorRemoved(uint256 tokenId) { require( !isRemoved(tokenId) && !isPublished(tokenId), "Kolor Land NFT: This land can't be transfered to Marketplace" ); _; } function isLandOwner(address landOwner, uint256 tokenId) internal view returns (bool) { return mintedNFTSInfo[tokenId].landOwner == landOwner; } function isRemoved(uint256 tokenId) public view returns (bool) { return mintedNFTSInfo[tokenId].state == State.Removed; } function isPublished(uint256 tokenId) public view returns (bool) { return mintedNFTSInfo[tokenId].state == State.Published; } /** @dev Override of functions defined on interface ILandNFT */ function updateLandState(uint256 tokenId, State _state) public override notBurned(tokenId) onlyAuthorized { require(_state != State.Created, "Kolor Land NFT: Invalid State"); mintedNFTSInfo[tokenId].state = _state; } function updateLandOwner( uint256 tokenId, address newLandOwner, string memory name ) public override onlyAuthorized notBurned(tokenId) { mintedNFTSInfo[tokenId].landOwner = newLandOwner; mintedNFTSInfo[tokenId].landOwnerAlias = name; } /** @dev adds a new buyer to this land */ function addBuyer(uint256 tokenId, address newBuyer) public override onlyMarketplace notBurned(tokenId) { buyers[tokenId][newBuyer] = true; totalBuyers[tokenId]++; } function updateName(uint256 tokenId, string memory newName) public override onlyAuthorized notBurned(tokenId) { mintedNFTSInfo[tokenId].name = newName; } function landOwnerOf(uint256 tokenId) public view override returns (address) { address landOwner = mintedNFTSInfo[tokenId].landOwner; return landOwner; } function isBuyerOf(uint256 tokenId, address buyer) public view override returns (bool) { return buyers[tokenId][buyer]; } function initialTCO2Of(uint256 tokenId) public view override returns (uint256) { return mintedNFTSInfo[tokenId].initialTCO2perYear; } function stateOf(uint256 tokenId) public view override returns (State) { return mintedNFTSInfo[tokenId].state; } /** @dev transfers the token to the marketplace and marks it as published for buyers to invest */ function safeTransferToMarketplace(address from, uint256 tokenId) public override notBurned(tokenId) onlyAuthorized notPublishedNorRemoved(tokenId) { // Transfer to the marketplace updateLandState(tokenId, State.Published); safeTransferFrom(from, marketplace, tokenId); } function getNFTInfo(uint256 tokenId) public view returns (NFTInfo memory) { return mintedNFTSInfo[tokenId]; } function landOfOwnerByIndex(address landOwner, uint256 index) public view returns (uint256) { require( index < balanceOf(landOwner) + 1, "landowner index out of bounds" ); return ownedLands[landOwner][index]; } function totalLandOwnedOf(address landOwner) public view returns (uint256) { return _totalLandOwned[landOwner]; } function totalSpeciesOf(uint256 tokenId) public view returns (uint256) { return totalSpecies[tokenId]; } function totalPointsOf(uint256 tokenId) public view returns (uint256) { return totalPoints[tokenId]; } /** @dev set all species of a certain land */ function setSpecies(uint256 tokenId, Species[] memory _species) public onlyAuthorized notBurned(tokenId) { require( totalSpeciesOf(tokenId) == 0, "Kolor Land NFT: Species of this land already been set" ); uint256 _totalSpecies = _species.length; for (uint256 i = 0; i < _totalSpecies; i++) { species[tokenId][i].speciesAlias = _species[i].speciesAlias; species[tokenId][i].scientificName = _species[i].scientificName; species[tokenId][i].density = _species[i].density; species[tokenId][i].size = _species[i].size; species[tokenId][i].decimals = _species[i].decimals; species[tokenId][i].TCO2perSecond = _species[i].TCO2perSecond; species[tokenId][i].TCO2perYear = _species[i].TCO2perYear; species[tokenId][i].landId = tokenId; species[tokenId][i].creationDate = block.timestamp; } totalSpecies[tokenId] = _totalSpecies; } function addSpecies(uint256 tokenId, Species memory _species) public onlyAuthorized notBurned(tokenId) { uint256 _totalSpecies = totalSpeciesOf(tokenId); species[tokenId][_totalSpecies].speciesAlias = _species.speciesAlias; species[tokenId][_totalSpecies].scientificName = _species .scientificName; species[tokenId][_totalSpecies].density = _species.density; species[tokenId][_totalSpecies].size = _species.size; species[tokenId][_totalSpecies].decimals = _species.decimals; species[tokenId][_totalSpecies].TCO2perYear = _species.TCO2perYear; species[tokenId][_totalSpecies].landId = tokenId; species[tokenId][_totalSpecies].creationDate = block.timestamp; species[tokenId][_totalSpecies].TCO2perSecond = _species.TCO2perSecond; totalSpecies[tokenId]++; } function updateSpecies( uint256 tokenId, uint256 speciesIndex, Species memory _species ) public onlyAuthorized notBurned(tokenId) { require( validSpecie(speciesIndex, tokenId), "Kolor Land NFT: Invalid specie to update" ); species[tokenId][speciesIndex].speciesAlias = _species.speciesAlias; species[tokenId][speciesIndex].scientificName = _species.scientificName; species[tokenId][speciesIndex].density = _species.density; species[tokenId][speciesIndex].size = _species.size; species[tokenId][speciesIndex].TCO2perYear = _species.TCO2perYear; species[tokenId][speciesIndex].landId = tokenId; species[tokenId][speciesIndex].updateDate = block.timestamp; species[tokenId][speciesIndex].TCO2perSecond = _species.TCO2perSecond; } function setPoints(uint256 tokenId, GeoSpatialPoint[] memory _points) public onlyAuthorized notBurned(tokenId) { require( totalPointsOf(tokenId) == 0, "Kolor Land NFT: Geospatial points of this land already been set" ); uint256 _totalPoints = _points.length; for (uint256 i = 0; i < _totalPoints; i++) { points[tokenId][i].latitude = _points[i].latitude; points[tokenId][i].longitude = _points[i].longitude; points[tokenId][i].decimals = _points[i].decimals; points[tokenId][i].creationDate = block.timestamp; totalPoints[tokenId]++; } } function addPoint(uint256 tokenId, GeoSpatialPoint memory point) public onlyAuthorized notBurned(tokenId) { uint256 _totalPoints = totalPoints[tokenId]; points[tokenId][_totalPoints].latitude = point.latitude; points[tokenId][_totalPoints].longitude = point.longitude; points[tokenId][_totalPoints].decimals = point.decimals; totalPoints[tokenId]++; } function updatePoint( uint256 tokenId, uint256 pointIndex, GeoSpatialPoint memory point ) public onlyAuthorized notBurned(tokenId) { require( validPoint(pointIndex, tokenId), "Kolor Land NFT: Invalid point to update" ); points[tokenId][pointIndex].latitude = point.latitude; points[tokenId][pointIndex].longitude = point.longitude; points[tokenId][pointIndex].decimals = point.decimals; } function validSpecie(uint256 specieIndex, uint256 tokenId) internal view returns (bool) { if (specieIndex >= 0 && specieIndex < totalSpeciesOf(tokenId)) { return true; } return false; } function validPoint(uint256 pointIndex, uint256 tokenId) internal view returns (bool) { if (pointIndex >= 0 && pointIndex < totalPointsOf(tokenId)) { return true; } return false; } function offsetEmissions(uint256 tokenId, uint256 amount) public onlyMarketplace notBurned(tokenId) { mintedNFTSInfo[tokenId].soldTCO2 += amount; } function totalVCUBySpecies(uint256 tokenId, uint256 index) public view returns (uint256) { // Get the seconds elapsed until now uint256 speciesCreationDate = species[tokenId][index].creationDate; uint256 secondsElapsed = timestampDifference( speciesCreationDate, block.timestamp ); // now we get the total vcus emitted until now return secondsElapsed * species[tokenId][index].TCO2perSecond; } function totalVCUSEmitedBy(uint256 tokenId) public view returns (uint256) { // Get total species of a land uint256 _totalSpecies = totalSpeciesOf(tokenId); uint256 totalVCUSEmitted = 0; // Iterate over all species and calculate its total vcu for (uint256 i = 0; i < _totalSpecies; i++) { uint256 currentVCUSEmitted = totalVCUBySpecies(tokenId, i); totalVCUSEmitted += currentVCUSEmitted; } return totalVCUSEmitted; } /** @dev returns vcus emitted from this land that are available for sale */ function getVCUSLeft(uint256 tokenId) public view override returns (uint256) { // Get the ideal vcutokens from creation date until now uint256 totalVCUSEmited = totalVCUSEmitedBy(tokenId); // get the difference between the ideal minus the sold TCO2 return totalVCUSEmited - mintedNFTSInfo[tokenId].soldTCO2; } function timestampDifference(uint256 timestamp1, uint256 timestamp2) public pure returns (uint256) { return timestamp2 - timestamp1; } function setBaseURI(string memory _baseURI) public onlyOwner { baseURI = _baseURI; } function tokenURI(uint256 tokenId) public view override returns (string memory) { require( _exists(tokenId), "ERC721Metadata: URI query for nonexistent token" ); return string( abi.encodePacked(baseURI, mintedNFTSInfo[tokenId].identifier) ); } // The following functions are overrides required by Solidity. function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal override(ERC721, ERC721Enumerable) { super._beforeTokenTransfer(from, to, tokenId); } function supportsInterface(bytes4 interfaceId) public view override(ERC721, ERC721Enumerable) returns (bool) { return super.supportsInterface(interfaceId); } }
/_openzeppelin/contracts/access/Ownable.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_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 { _transferOwnership(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"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
/_openzeppelin/contracts/token/ERC721/ERC721.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/ERC721.sol) pragma solidity ^0.8.0; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "./extensions/IERC721Metadata.sol"; import "../../utils/Address.sol"; import "../../utils/Context.sol"; import "../../utils/Strings.sol"; import "../../utils/introspection/ERC165.sol"; /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension, but not including the Enumerable extension, which is available separately as * {ERC721Enumerable}. */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { using Address for address; using Strings for uint256; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to owner address mapping(uint256 => address) private _owners; // Mapping owner address to token count mapping(address => uint256) private _balances; // Mapping from token ID to approved address mapping(uint256 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: balance query for the zero address"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _owners[tokenId]; require(owner != address(0), "ERC721: owner query for nonexistent token"); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ""; } /** * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. Empty * by default, can be overriden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721.ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require( _msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { _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: 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 Approve `operator` to operate on all of `owner` tokens * * Emits a {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 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 {} }
/_openzeppelin/contracts/token/ERC721/IERC721.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol) pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool _approved) external; /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes calldata data ) external; }
/_openzeppelin/contracts/token/ERC721/IERC721Receiver.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol) 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); }
/_openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Burnable.sol) pragma solidity ^0.8.0; import "../ERC721.sol"; import "../../../utils/Context.sol"; /** * @title ERC721 Burnable Token * @dev ERC721 Token that can be irreversibly burned (destroyed). */ abstract contract ERC721Burnable is Context, ERC721 { /** * @dev Burns `tokenId`. See {ERC721-_burn}. * * Requirements: * * - The caller must own `tokenId` or be an approved operator. */ function burn(uint256 tokenId) public virtual { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved"); _burn(tokenId); } }
/_openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol
// 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 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(); } }
/_openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol) 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); }
/_openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol) 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); }
/_openzeppelin/contracts/utils/Address.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Address.sol) 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); } } } }
/_openzeppelin/contracts/utils/Context.sol
// 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; } }
/_openzeppelin/contracts/utils/Counters.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Counters.sol) pragma solidity ^0.8.0; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` */ library Counters { struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { unchecked { counter._value += 1; } } function decrement(Counter storage counter) internal { uint256 value = counter._value; require(value > 0, "Counter: decrement overflow"); unchecked { counter._value = value - 1; } } function reset(Counter storage counter) internal { counter._value = 0; } }
/_openzeppelin/contracts/utils/Strings.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Strings.sol) 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); } }
/_openzeppelin/contracts/utils/introspection/ERC165.sol
// 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; } }
/_openzeppelin/contracts/utils/introspection/IERC165.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol) 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); }
/project_/contracts/IKolorLandNFT.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; enum State { Created, Paused, Removed, Published } interface IKolorLandNFT { /** @dev Updates the availibility of tokenized land to be purchased in a marketplace */ function updateLandState(uint256 tokenId, State state) external; function updateLandOwner( uint256 tokenId, address newLandOwner, string memory name ) external; function addBuyer(uint256 tokenId, address newBuyer) external; function updateName(uint256 tokenId, string memory name) external; function landOwnerOf(uint256 tokenId) external view returns (address landOwner); function isBuyerOf(uint256 tokenId, address buyer) external view returns (bool); function initialTCO2Of(uint256 tokenId) external view returns (uint256 initialTCO2); function stateOf(uint256 tokenId) external view returns (State state); function safeTransferToMarketplace(address from, uint256 tokenId) external; function getVCUSLeft(uint256 tokenId) external view returns (uint256 vcus); }
Contract ABI
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GeoSpatialPoint","components":[{"type":"int256","name":"latitude","internalType":"int256"},{"type":"int256","name":"longitude","internalType":"int256"},{"type":"uint256","name":"decimals","internalType":"uint256"},{"type":"uint256","name":"creationDate","internalType":"uint256"},{"type":"uint256","name":"updateDate","internalType":"uint256"}]}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"addSpecies","inputs":[{"type":"uint256","name":"tokenId","internalType":"uint256"},{"type":"tuple","name":"_species","internalType":"struct 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NFTInfo","components":[{"type":"string","name":"name","internalType":"string"},{"type":"string","name":"identifier","internalType":"string"},{"type":"address","name":"landOwner","internalType":"address"},{"type":"string","name":"landOwnerAlias","internalType":"string"},{"type":"uint256","name":"decimals","internalType":"uint256"},{"type":"uint256","name":"size","internalType":"uint256"},{"type":"string","name":"country","internalType":"string"},{"type":"string","name":"stateOrRegion","internalType":"string"},{"type":"string","name":"city","internalType":"string"},{"type":"uint8","name":"state","internalType":"enum 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int256","name":"tokenId","internalType":"uint256"},{"type":"bytes","name":"_data","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"safeTransferToMarketplace","inputs":[{"type":"address","name":"from","internalType":"address"},{"type":"uint256","name":"tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setApprovalForAll","inputs":[{"type":"address","name":"operator","internalType":"address"},{"type":"bool","name":"approved","internalType":"bool"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setBaseURI","inputs":[{"type":"string","name":"_baseURI","internalType":"string"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setMarketplace","inputs":[{"type":"address","name":"_marketplace","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setPoints","inputs":[{"type":"uint256","name":"tokenId","internalType":"uint256"},{"type":"tuple[]","name":"_points","internalType":"struct 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Contract Creation Code
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