Overview
TokenID
10080081
Total Transfers
-
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
LandSectorAsset
Compiler Version
v0.5.4+commit.9549d8ff
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2019-02-28 */ pragma solidity ^0.5.0; // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/introspection/IERC165.sol /** * @title IERC165 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md */ interface IERC165 { /** * @notice Query if a contract implements an interface * @param interfaceId The interface identifier, as specified in ERC-165 * @dev Interface identification is specified in ERC-165. This function * uses less than 30,000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/IERC721.sol /** * @title ERC721 Non-Fungible Token Standard basic interface * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract IERC721 is IERC165 { event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); event ApprovalForAll(address indexed owner, address indexed operator, bool approved); function balanceOf(address owner) public view returns (uint256 balance); function ownerOf(uint256 tokenId) public view returns (address owner); function approve(address to, uint256 tokenId) public; function getApproved(uint256 tokenId) public view returns (address operator); function setApprovalForAll(address operator, bool _approved) public; function isApprovedForAll(address owner, address operator) public view returns (bool); function transferFrom(address from, address to, uint256 tokenId) public; function safeTransferFrom(address from, address to, uint256 tokenId) public; function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public; } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/IERC721Receiver.sol /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ contract IERC721Receiver { /** * @notice Handle the receipt of an NFT * @dev The ERC721 smart contract calls this function on the recipient * after a `safeTransfer`. This function MUST return the function selector, * otherwise the caller will revert the transaction. The selector to be * returned can be obtained as `this.onERC721Received.selector`. This * function MAY throw to revert and reject the transfer. * Note: the ERC721 contract address is always the message sender. * @param operator The address which called `safeTransferFrom` function * @param from The address which previously owned the token * @param tokenId The NFT identifier which is being transferred * @param data Additional data with no specified format * @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` */ function onERC721Received(address operator, address from, uint256 tokenId, bytes memory data) public returns (bytes4); } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/math/SafeMath.sol /** * @title SafeMath * @dev Unsigned math operations with safety checks that revert on error */ library SafeMath { /** * @dev Multiplies two unsigned integers, reverts on overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b); return c; } /** * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a); uint256 c = a - b; return c; } /** * @dev Adds two unsigned integers, reverts on overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a); return c; } /** * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo), * reverts when dividing by zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b != 0); return a % b; } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/utils/Address.sol /** * Utility library of inline functions on addresses */ library Address { /** * Returns whether the target address is a contract * @dev This function will return false if invoked during the constructor of a contract, * as the code is not actually created until after the constructor finishes. * @param account address of the account to check * @return whether the target address is a contract */ function isContract(address account) internal view returns (bool) { uint256 size; // XXX Currently there is no better way to check if there is a contract in an address // than to check the size of the code at that address. // See https://ethereum.stackexchange.com/a/14016/36603 // for more details about how this works. // TODO Check this again before the Serenity release, because all addresses will be // contracts then. // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/introspection/ERC165.sol /** * @title ERC165 * @author Matt Condon (@shrugs) * @dev Implements ERC165 using a lookup table. */ contract ERC165 is IERC165 { bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; /** * 0x01ffc9a7 === * bytes4(keccak256('supportsInterface(bytes4)')) */ /** * @dev a mapping of interface id to whether or not it's supported */ mapping(bytes4 => bool) private _supportedInterfaces; /** * @dev A contract implementing SupportsInterfaceWithLookup * implement ERC165 itself */ constructor () internal { _registerInterface(_INTERFACE_ID_ERC165); } /** * @dev implement supportsInterface(bytes4) using a lookup table */ function supportsInterface(bytes4 interfaceId) external view returns (bool) { return _supportedInterfaces[interfaceId]; } /** * @dev internal method for registering an interface */ function _registerInterface(bytes4 interfaceId) internal { require(interfaceId != 0xffffffff); _supportedInterfaces[interfaceId] = true; } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721.sol /** * @title ERC721 Non-Fungible Token Standard basic implementation * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721 is ERC165, IERC721 { using SafeMath for uint256; using Address for address; // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector` bytes4 private constant _ERC721_RECEIVED = 0x150b7a02; // Mapping from token ID to owner mapping (uint256 => address) private _tokenOwner; // Mapping from token ID to approved address mapping (uint256 => address) private _tokenApprovals; // Mapping from owner to number of owned token mapping (address => uint256) private _ownedTokensCount; // Mapping from owner to operator approvals mapping (address => mapping (address => bool)) private _operatorApprovals; bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd; /* * 0x80ac58cd === * bytes4(keccak256('balanceOf(address)')) ^ * bytes4(keccak256('ownerOf(uint256)')) ^ * bytes4(keccak256('approve(address,uint256)')) ^ * bytes4(keccak256('getApproved(uint256)')) ^ * bytes4(keccak256('setApprovalForAll(address,bool)')) ^ * bytes4(keccak256('isApprovedForAll(address,address)')) ^ * bytes4(keccak256('transferFrom(address,address,uint256)')) ^ * bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^ * bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) */ constructor () public { // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(_INTERFACE_ID_ERC721); } /** * @dev Gets the balance of the specified address * @param owner address to query the balance of * @return uint256 representing the amount owned by the passed address */ function balanceOf(address owner) public view returns (uint256) { require(owner != address(0)); return _ownedTokensCount[owner]; } /** * @dev Gets the owner of the specified token ID * @param tokenId uint256 ID of the token to query the owner of * @return owner address currently marked as the owner of the given token ID */ function ownerOf(uint256 tokenId) public view returns (address) { address owner = _tokenOwner[tokenId]; require(owner != address(0)); return owner; } /** * @dev Approves another address to transfer the given token ID * The zero address indicates there is no approved address. * There can only be one approved address per token at a given time. * Can only be called by the token owner or an approved operator. * @param to address to be approved for the given token ID * @param tokenId uint256 ID of the token to be approved */ function approve(address to, uint256 tokenId) public { address owner = ownerOf(tokenId); require(to != owner); require(msg.sender == owner || isApprovedForAll(owner, msg.sender)); _tokenApprovals[tokenId] = to; emit Approval(owner, to, tokenId); } /** * @dev Gets the approved address for a token ID, or zero if no address set * Reverts if the token ID does not exist. * @param tokenId uint256 ID of the token to query the approval of * @return address currently approved for the given token ID */ function getApproved(uint256 tokenId) public view returns (address) { require(_exists(tokenId)); return _tokenApprovals[tokenId]; } /** * @dev Sets or unsets the approval of a given operator * An operator is allowed to transfer all tokens of the sender on their behalf * @param to operator address to set the approval * @param approved representing the status of the approval to be set */ function setApprovalForAll(address to, bool approved) public { require(to != msg.sender); _operatorApprovals[msg.sender][to] = approved; emit ApprovalForAll(msg.sender, to, approved); } /** * @dev Tells whether an operator is approved by a given owner * @param owner owner address which you want to query the approval of * @param operator operator address which you want to query the approval of * @return bool whether the given operator is approved by the given owner */ function isApprovedForAll(address owner, address operator) public view returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev Transfers the ownership of a given token ID to another address * Usage of this method is discouraged, use `safeTransferFrom` whenever possible * Requires the msg sender to be the owner, approved, or operator * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred */ function transferFrom(address from, address to, uint256 tokenId) public { require(_isApprovedOrOwner(msg.sender, tokenId)); _transferFrom(from, to, tokenId); } /** * @dev Safely transfers the ownership of a given token ID to another address * If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * * Requires the msg sender to be the owner, approved, or operator * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred */ function safeTransferFrom(address from, address to, uint256 tokenId) public { safeTransferFrom(from, to, tokenId, ""); } /** * @dev Safely transfers the ownership of a given token ID to another address * If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * Requires the msg sender to be the owner, approved, or operator * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred * @param _data bytes data to send along with a safe transfer check */ function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public { transferFrom(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, _data)); } /** * @dev Returns whether the specified token exists * @param tokenId uint256 ID of the token to query the existence of * @return whether the token exists */ function _exists(uint256 tokenId) internal view returns (bool) { address owner = _tokenOwner[tokenId]; return owner != address(0); } /** * @dev Returns whether the given spender can transfer a given token ID * @param spender address of the spender to query * @param tokenId uint256 ID of the token to be transferred * @return bool whether the msg.sender is approved for the given token ID, * is an operator of the owner, or is the owner of the token */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) { address owner = ownerOf(tokenId); return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender)); } /** * @dev Internal function to mint a new token * Reverts if the given token ID already exists * @param to The address that will own the minted token * @param tokenId uint256 ID of the token to be minted */ function _mint(address to, uint256 tokenId) internal { require(to != address(0)); require(!_exists(tokenId)); _tokenOwner[tokenId] = to; _ownedTokensCount[to] = _ownedTokensCount[to].add(1); emit Transfer(address(0), to, tokenId); } /** * @dev Internal function to burn a specific token * Reverts if the token does not exist * Deprecated, use _burn(uint256) instead. * @param owner owner of the token to burn * @param tokenId uint256 ID of the token being burned */ function _burn(address owner, uint256 tokenId) internal { require(ownerOf(tokenId) == owner); _clearApproval(tokenId); _ownedTokensCount[owner] = _ownedTokensCount[owner].sub(1); _tokenOwner[tokenId] = address(0); emit Transfer(owner, address(0), tokenId); } /** * @dev Internal function to burn a specific token * Reverts if the token does not exist * @param tokenId uint256 ID of the token being burned */ function _burn(uint256 tokenId) internal { _burn(ownerOf(tokenId), tokenId); } /** * @dev Internal function to transfer ownership of a given token ID to another address. * As opposed to transferFrom, this imposes no restrictions on msg.sender. * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred */ function _transferFrom(address from, address to, uint256 tokenId) internal { require(ownerOf(tokenId) == from); require(to != address(0)); _clearApproval(tokenId); _ownedTokensCount[from] = _ownedTokensCount[from].sub(1); _ownedTokensCount[to] = _ownedTokensCount[to].add(1); _tokenOwner[tokenId] = to; emit Transfer(from, to, tokenId); } /** * @dev Internal function to invoke `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 whether the call correctly returned the expected magic value */ function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data) internal returns (bool) { if (!to.isContract()) { return true; } bytes4 retval = IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data); return (retval == _ERC721_RECEIVED); } /** * @dev Private function to clear current approval of a given token ID * @param tokenId uint256 ID of the token to be transferred */ function _clearApproval(uint256 tokenId) private { if (_tokenApprovals[tokenId] != address(0)) { _tokenApprovals[tokenId] = address(0); } } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/access/Roles.sol /** * @title Roles * @dev Library for managing addresses assigned to a Role. */ library Roles { struct Role { mapping (address => bool) bearer; } /** * @dev give an account access to this role */ function add(Role storage role, address account) internal { require(account != address(0)); require(!has(role, account)); role.bearer[account] = true; } /** * @dev remove an account's access to this role */ function remove(Role storage role, address account) internal { require(account != address(0)); require(has(role, account)); role.bearer[account] = false; } /** * @dev check if an account has this role * @return bool */ function has(Role storage role, address account) internal view returns (bool) { require(account != address(0)); return role.bearer[account]; } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/access/roles/MinterRole.sol contract MinterRole { using Roles for Roles.Role; event MinterAdded(address indexed account); event MinterRemoved(address indexed account); Roles.Role private _minters; constructor () internal { _addMinter(msg.sender); } modifier onlyMinter() { require(isMinter(msg.sender)); _; } function isMinter(address account) public view returns (bool) { return _minters.has(account); } function addMinter(address account) public onlyMinter { _addMinter(account); } function renounceMinter() public { _removeMinter(msg.sender); } function _addMinter(address account) internal { _minters.add(account); emit MinterAdded(account); } function _removeMinter(address account) internal { _minters.remove(account); emit MinterRemoved(account); } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721Mintable.sol /** * @title ERC721Mintable * @dev ERC721 minting logic */ contract ERC721Mintable is ERC721, MinterRole { /** * @dev Function to mint tokens * @param to The address that will receive the minted tokens. * @param tokenId The token id to mint. * @return A boolean that indicates if the operation was successful. */ function mint(address to, uint256 tokenId) public onlyMinter returns (bool) { _mint(to, tokenId); return true; } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/access/roles/PauserRole.sol contract PauserRole { using Roles for Roles.Role; event PauserAdded(address indexed account); event PauserRemoved(address indexed account); Roles.Role private _pausers; constructor () internal { _addPauser(msg.sender); } modifier onlyPauser() { require(isPauser(msg.sender)); _; } function isPauser(address account) public view returns (bool) { return _pausers.has(account); } function addPauser(address account) public onlyPauser { _addPauser(account); } function renouncePauser() public { _removePauser(msg.sender); } function _addPauser(address account) internal { _pausers.add(account); emit PauserAdded(account); } function _removePauser(address account) internal { _pausers.remove(account); emit PauserRemoved(account); } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/lifecycle/Pausable.sol /** * @title Pausable * @dev Base contract which allows children to implement an emergency stop mechanism. */ contract Pausable is PauserRole { event Paused(address account); event Unpaused(address account); bool private _paused; constructor () internal { _paused = false; } /** * @return true if the contract is paused, false otherwise. */ function paused() public view returns (bool) { return _paused; } /** * @dev Modifier to make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!_paused); _; } /** * @dev Modifier to make a function callable only when the contract is paused. */ modifier whenPaused() { require(_paused); _; } /** * @dev called by the owner to pause, triggers stopped state */ function pause() public onlyPauser whenNotPaused { _paused = true; emit Paused(msg.sender); } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() public onlyPauser whenPaused { _paused = false; emit Unpaused(msg.sender); } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721Pausable.sol /** * @title ERC721 Non-Fungible Pausable token * @dev ERC721 modified with pausable transfers. **/ contract ERC721Pausable is ERC721, Pausable { function approve(address to, uint256 tokenId) public whenNotPaused { super.approve(to, tokenId); } function setApprovalForAll(address to, bool approved) public whenNotPaused { super.setApprovalForAll(to, approved); } function transferFrom(address from, address to, uint256 tokenId) public whenNotPaused { super.transferFrom(from, to, tokenId); } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/IERC721Enumerable.sol /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract IERC721Enumerable is IERC721 { function totalSupply() public view returns (uint256); function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256 tokenId); function tokenByIndex(uint256 index) public view returns (uint256); } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721Enumerable.sol /** * @title ERC-721 Non-Fungible Token with optional enumeration extension logic * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Enumerable is ERC165, ERC721, IERC721Enumerable { // Mapping from owner to list of owned token IDs mapping(address => 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; bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63; /** * 0x780e9d63 === * bytes4(keccak256('totalSupply()')) ^ * bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^ * bytes4(keccak256('tokenByIndex(uint256)')) */ /** * @dev Constructor function */ constructor () public { // register the supported interface to conform to ERC721 via ERC165 _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE); } /** * @dev Gets the token ID at a given index of the tokens list of the requested owner * @param owner address owning the tokens list to be accessed * @param index uint256 representing the index to be accessed of the requested tokens list * @return uint256 token ID at the given index of the tokens list owned by the requested address */ function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) { require(index < balanceOf(owner)); return _ownedTokens[owner][index]; } /** * @dev Gets the total amount of tokens stored by the contract * @return uint256 representing the total amount of tokens */ function totalSupply() public view returns (uint256) { return _allTokens.length; } /** * @dev Gets the token ID at a given index of all the tokens in this contract * Reverts if the index is greater or equal to the total number of tokens * @param index uint256 representing the index to be accessed of the tokens list * @return uint256 token ID at the given index of the tokens list */ function tokenByIndex(uint256 index) public view returns (uint256) { require(index < totalSupply()); return _allTokens[index]; } /** * @dev Internal function to transfer ownership of a given token ID to another address. * As opposed to transferFrom, this imposes no restrictions on msg.sender. * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred */ function _transferFrom(address from, address to, uint256 tokenId) internal { super._transferFrom(from, to, tokenId); _removeTokenFromOwnerEnumeration(from, tokenId); _addTokenToOwnerEnumeration(to, tokenId); } /** * @dev Internal function to mint a new token * Reverts if the given token ID already exists * @param to address the beneficiary that will own the minted token * @param tokenId uint256 ID of the token to be minted */ function _mint(address to, uint256 tokenId) internal { super._mint(to, tokenId); _addTokenToOwnerEnumeration(to, tokenId); _addTokenToAllTokensEnumeration(tokenId); } /** * @dev Internal function to burn a specific token * Reverts if the token does not exist * Deprecated, use _burn(uint256) instead * @param owner owner of the token to burn * @param tokenId uint256 ID of the token being burned */ function _burn(address owner, uint256 tokenId) internal { super._burn(owner, tokenId); _removeTokenFromOwnerEnumeration(owner, tokenId); // Since tokenId will be deleted, we can clear its slot in _ownedTokensIndex to trigger a gas refund _ownedTokensIndex[tokenId] = 0; _removeTokenFromAllTokensEnumeration(tokenId); } /** * @dev Gets the list of token IDs of the requested owner * @param owner address owning the tokens * @return uint256[] List of token IDs owned by the requested address */ function _tokensOfOwner(address owner) internal view returns (uint256[] storage) { return _ownedTokens[owner]; } /** * @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 { _ownedTokensIndex[tokenId] = _ownedTokens[to].length; _ownedTokens[to].push(tokenId); } /** * @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 = _ownedTokens[from].length.sub(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 _ownedTokens[from].length--; // Note that _ownedTokensIndex[tokenId] hasn't been cleared: it still points to the old slot (now occcupied by // lasTokenId, or just over the end of the array if the token was the last one). } /** * @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.sub(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 _allTokens.length--; _allTokensIndex[tokenId] = 0; } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/IERC721Metadata.sol /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract IERC721Metadata is IERC721 { function name() external view returns (string memory); function symbol() external view returns (string memory); function tokenURI(uint256 tokenId) external view returns (string memory); } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721Metadata.sol contract ERC721Metadata is ERC165, ERC721, IERC721Metadata { // Token name string private _name; // Token symbol string private _symbol; // Optional mapping for token URIs mapping(uint256 => string) private _tokenURIs; bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f; /** * 0x5b5e139f === * bytes4(keccak256('name()')) ^ * bytes4(keccak256('symbol()')) ^ * bytes4(keccak256('tokenURI(uint256)')) */ /** * @dev Constructor function */ constructor (string memory name, string memory symbol) public { _name = name; _symbol = symbol; // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(_INTERFACE_ID_ERC721_METADATA); } /** * @dev Gets the token name * @return string representing the token name */ function name() external view returns (string memory) { return _name; } /** * @dev Gets the token symbol * @return string representing the token symbol */ function symbol() external view returns (string memory) { return _symbol; } /** * @dev Returns an URI for a given token ID * Throws if the token ID does not exist. May return an empty string. * @param tokenId uint256 ID of the token to query */ function tokenURI(uint256 tokenId) external view returns (string memory) { require(_exists(tokenId)); return _tokenURIs[tokenId]; } /** * @dev Internal function to set the token URI for a given token * Reverts if the token ID does not exist * @param tokenId uint256 ID of the token to set its URI * @param uri string URI to assign */ function _setTokenURI(uint256 tokenId, string memory uri) internal { require(_exists(tokenId)); _tokenURIs[tokenId] = uri; } /** * @dev Internal function to burn a specific token * Reverts if the token does not exist * Deprecated, use _burn(uint256) instead * @param owner owner of the token to burn * @param tokenId uint256 ID of the token being burned by the msg.sender */ function _burn(address owner, uint256 tokenId) internal { super._burn(owner, tokenId); // Clear metadata (if any) if (bytes(_tokenURIs[tokenId]).length != 0) { delete _tokenURIs[tokenId]; } } } // File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721FUll.sol /** * @title Full ERC721 Token * This implementation includes all the required and some optional functionality of the ERC721 standard * Moreover, it includes approve all functionality using operator terminology * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Full is ERC721, ERC721Enumerable, ERC721Metadata { constructor (string memory name, string memory symbol) public ERC721Metadata(name, symbol) { // solhint-disable-previous-line no-empty-blocks } } // File: contracts/LandSectorAsset.sol /* solhint-disable indent*/ pragma solidity 0.5.4; contract LandSectorAsset is ERC721Full, ERC721Mintable, ERC721Pausable { uint256 public constant SHARE_RATE_DECIMAL = 10**18; uint16 public constant LEGENDARY_RARITY = 5; uint16 public constant EPIC_RARITY = 4; uint16 public constant RARE_RARITY = 3; uint16 public constant UNCOMMON_RARITY = 2; uint16 public constant COMMON_RARITY = 1; uint16 public constant NO_LAND = 0; string public tokenURIPrefix = "https://www.mycryptoheroes.net/metadata/land/"; mapping(uint16 => uint256) private landTypeToTotalVolume; mapping(uint16 => uint256) private landTypeToSectorSupplyLimit; mapping(uint16 => mapping(uint16 => uint256)) private landTypeAndRarityToSectorSupply; mapping(uint16 => uint256[]) private landTypeToLandSectorList; mapping(uint16 => uint256) private landTypeToLandSectorIndex; mapping(uint16 => mapping(uint16 => uint256)) private landTypeAndRarityToLandSectorCount; mapping(uint16 => uint256) private rarityToSectorVolume; mapping(uint256 => bool) private allowed; event MintEvent( address indexed assetOwner, uint256 tokenId, uint256 at, bytes32 indexed eventHash ); constructor() public ERC721Full("MyCryptoHeroes:Land", "MCHL") { rarityToSectorVolume[5] = 100; rarityToSectorVolume[4] = 20; rarityToSectorVolume[3] = 5; rarityToSectorVolume[2] = 2; rarityToSectorVolume[1] = 1; landTypeToTotalVolume[NO_LAND] = 0; } function setSupplyAndSector( uint16 _landType, uint256 _totalVolume, uint256 _sectorSupplyLimit, uint256 legendarySupply, uint256 epicSupply, uint256 rareSupply, uint256 uncommonSupply, uint256 commonSupply ) external onlyMinter { require(_landType != 0, "landType 0 is noland"); require(_totalVolume != 0, "totalVolume must not be 0"); require(getMintedSectorCount(_landType) == 0, "This LandType already exists"); require( legendarySupply.mul(rarityToSectorVolume[LEGENDARY_RARITY]) .add(epicSupply.mul(rarityToSectorVolume[EPIC_RARITY])) .add(rareSupply.mul(rarityToSectorVolume[RARE_RARITY])) .add(uncommonSupply.mul(rarityToSectorVolume[UNCOMMON_RARITY])) .add(commonSupply.mul(rarityToSectorVolume[COMMON_RARITY])) == _totalVolume ); require( legendarySupply .add(epicSupply) .add(rareSupply) .add(uncommonSupply) .add(commonSupply) == _sectorSupplyLimit ); landTypeToTotalVolume[_landType] = _totalVolume; landTypeToSectorSupplyLimit[_landType] = _sectorSupplyLimit; landTypeAndRarityToSectorSupply[_landType][LEGENDARY_RARITY] = legendarySupply; landTypeAndRarityToSectorSupply[_landType][EPIC_RARITY] = epicSupply; landTypeAndRarityToSectorSupply[_landType][RARE_RARITY] = rareSupply; landTypeAndRarityToSectorSupply[_landType][UNCOMMON_RARITY] = uncommonSupply; landTypeAndRarityToSectorSupply[_landType][COMMON_RARITY] = commonSupply; } function approve(address _to, uint256 _tokenId) public { require(allowed[_tokenId]); super.approve(_to, _tokenId); } function transferFrom(address _from, address _to, uint256 _tokenId) public { require(allowed[_tokenId]); super.transferFrom(_from, _to, _tokenId); } function unLockToken(uint256 _tokenId) public onlyMinter { allowed[_tokenId] = true; } function setTokenURIPrefix(string calldata _tokenURIPrefix) external onlyMinter { tokenURIPrefix = _tokenURIPrefix; } function isAlreadyMinted(uint256 _tokenId) public view returns (bool) { return _exists(_tokenId); } function isValidLandSector(uint256 _tokenId) public view returns (bool) { uint16 rarity = getRarity(_tokenId); if (!(rarityToSectorVolume[rarity] > 0)) { return false; } uint16 landType = getLandType(_tokenId); if (!(landTypeToTotalVolume[landType] > 0)) { return false; } uint256 serial = _tokenId % 10000; if (serial == 0) { return false; } if (serial > landTypeAndRarityToSectorSupply[landType][rarity]) { return false; } return true; } function canTransfer(uint256 _tokenId) public view returns (bool) { return allowed[_tokenId]; } function getTotalVolume(uint16 _landType) public view returns (uint256) { return landTypeToTotalVolume[_landType]; } function getSectorSupplyLimit(uint16 _landType) public view returns (uint256) { return landTypeToSectorSupplyLimit[_landType]; } function getLandType(uint256 _landSector) public view returns (uint16) { uint16 _landType = uint16((_landSector.div(10000)) % 1000); return _landType; } function getRarity(uint256 _landSector) public view returns (uint16) { return uint16(_landSector.div(10**7)); } function getMintedSectorCount(uint16 _landType) public view returns (uint256) { return landTypeToLandSectorIndex[_landType]; } function getMintedSectorCountByRarity(uint16 _landType, uint16 _rarity) public view returns (uint256) { return landTypeAndRarityToLandSectorCount[_landType][_rarity]; } function getSectorSupplyByRarity(uint16 _landType, uint16 _rarity) public view returns (uint256) { return landTypeAndRarityToSectorSupply[_landType][_rarity]; } function getMintedSectorList(uint16 _landType) public view returns (uint256[] memory) { return landTypeToLandSectorList[_landType]; } function getSectorVolumeByRarity(uint16 _rarity) public view returns (uint256) { return rarityToSectorVolume[_rarity]; } function getShareRateWithDecimal(uint256 _landSector) public view returns (uint256, uint256) { return ( getSectorVolumeByRarity(getRarity(_landSector)) .mul(SHARE_RATE_DECIMAL) .div(getTotalVolume(getLandType(_landSector))), SHARE_RATE_DECIMAL ); } function mintLandSector(address _owner, uint256 _landSector, bytes32 _eventHash) public onlyMinter { require(!isAlreadyMinted(_landSector)); require(isValidLandSector(_landSector)); uint16 _landType = getLandType(_landSector); require(landTypeToLandSectorIndex[_landType] < landTypeToSectorSupplyLimit[_landType]); uint16 rarity = getRarity(_landSector); require(landTypeAndRarityToLandSectorCount[_landType][rarity] < landTypeAndRarityToSectorSupply[_landType][rarity], "supply over"); _mint(_owner, _landSector); landTypeToLandSectorList[_landType].push(_landSector); landTypeToLandSectorIndex[_landType]++; landTypeAndRarityToLandSectorCount[_landType][rarity]++; emit MintEvent( _owner, _landSector, block.timestamp, _eventHash ); } function tokenURI(uint256 _tokenId) public view returns (string memory) { bytes32 tokenIdBytes; if (_tokenId == 0) { tokenIdBytes = "0"; } else { uint256 value = _tokenId; while (value > 0) { tokenIdBytes = bytes32(uint256(tokenIdBytes) / (2 ** 8)); tokenIdBytes |= bytes32(((value % 10) + 48) * 2 ** (8 * 31)); value /= 10; } } bytes memory prefixBytes = bytes(tokenURIPrefix); bytes memory tokenURIBytes = new bytes(prefixBytes.length + tokenIdBytes.length); uint8 i; uint8 index = 0; for (i = 0; i < prefixBytes.length; i++) { tokenURIBytes[index] = prefixBytes[i]; index++; } for (i = 0; i < tokenIdBytes.length; i++) { tokenURIBytes[index] = tokenIdBytes[i]; index++; } return string(tokenURIBytes); } } /* solhint-enable indent*/
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Contract Creation Code
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Swarm Source
bzzr://2d55f3f64a7864fddc72ceac42316a206adc1b7d217743a6240457b925e8f6cc
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