Contract Name:
DeltaTimeNFT
Contract Source Code:
File 1 of 1 : DeltaTimeNFT
pragma solidity ^0.5.0;
/**
* @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);
}
/**
* @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;
}
}
/**
* @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);
}
/**
* @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;
}
/**
* @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);
}
/**
* @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];
}
}
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);
}
}
/**
* @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);
}
}
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);
}
}
/**
* @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;
}
}
/**
* 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;
}
}
library Strings {
function strConcat(string memory _a, string memory _b, string memory _c, string memory _d, string memory _e) internal pure returns (string memory _concatenatedString) {
bytes memory _ba = bytes(_a);
bytes memory _bb = bytes(_b);
bytes memory _bc = bytes(_c);
bytes memory _bd = bytes(_d);
bytes memory _be = bytes(_e);
bytes memory babcde = new bytes(_ba.length + _bb.length + _bc.length + _bd.length + _be.length);
uint k = 0;
uint i = 0;
for (i = 0; i < _ba.length; i++) {
babcde[k++] = _ba[i];
}
for (i = 0; i < _bb.length; i++) {
babcde[k++] = _bb[i];
}
for (i = 0; i < _bc.length; i++) {
babcde[k++] = _bc[i];
}
for (i = 0; i < _bd.length; i++) {
babcde[k++] = _bd[i];
}
for (i = 0; i < _be.length; i++) {
babcde[k++] = _be[i];
}
return string(babcde);
}
function strConcat(string memory _a, string memory _b, string memory _c, string memory _d) internal pure returns (string memory) {
return strConcat(_a, _b, _c, _d, "");
}
function strConcat(string memory _a, string memory _b, string memory _c) internal pure returns (string memory) {
return strConcat(_a, _b, _c, "", "");
}
function strConcat(string memory _a, string memory _b) internal pure returns (string memory) {
return strConcat(_a, _b, "", "", "");
}
function uint2str(uint _i) internal pure returns (string memory _uintAsString) {
if (_i == 0) {
return "0";
}
uint j = _i;
uint len;
while (j != 0) {
len++;
j /= 10;
}
bytes memory bstr = new bytes(len);
uint k = len - 1;
while (_i != 0) {
bstr[k--] = byte(uint8(48 + _i % 10));
_i /= 10;
}
return string(bstr);
}
function split(bytes memory _base, uint8[] memory _lengths) internal pure returns (bytes[] memory arr) {
uint _offset = 0;
bytes[] memory splitArr = new bytes[](_lengths.length);
for(uint i = 0; i < _lengths.length; i++) {
bytes memory _tmpBytes = new bytes(_lengths[i]);
for(uint j = 0; j < _lengths[i]; j++)
_tmpBytes[j] = _base[_offset+j];
splitArr[i] = _tmpBytes;
_offset += _lengths[i];
}
return splitArr;
}
}
/**
* @title F1 Delta Time Non-Fungible Token
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract DeltaTimeNFTBase is ERC165, IERC721, IERC721Metadata, Pausable, MinterRole {
using SafeMath for uint256;
using Address for address;
using Strings for string;
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)'))
*/
bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;
/**
* 0x5b5e139f ===
* bytes4(keccak256('name()')) ^
* bytes4(keccak256('symbol()')) ^
* bytes4(keccak256('tokenURI(uint256)'))
*/
// 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;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Token URI prefix
string private _baseTokenURI;
// Flag representing if metadata migrated to IPFS
bool private _ipfsMigrated;
// Token total Supply
uint256 private _totalSupply;
// Mapping from token ID to owner
mapping (uint256 => address) private _tokenOwner;
// Mapping from token ID to approved address
mapping (uint256 => address) private _tokenApprovals;
// Mapping Mapping from token ID to token URI
mapping(uint256 => string) private _tokenURIs;
// Mapping Mapping from token ID to token properties
mapping (uint256 => uint256) private _tokenProperties;
// 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;
event TokenURI(uint256 indexed tokenId, string uri);
/**
* @dev Constructor function
*/
constructor (string memory name, string memory symbol, string memory baseTokenURI) public {
_name = name;
_symbol = symbol;
_totalSupply = 0;
_baseTokenURI = baseTokenURI;
_ipfsMigrated = false;
// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(_INTERFACE_ID_ERC721);
_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 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 _totalSupply;
}
/**
* @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) external view returns (bool) {
return _exists(tokenId);
}
/**
* @dev Sets IPFS migration flag true
*/
function ipfsMigrationDone() public onlyMinter {
_ipfsMigrated = true;
}
/**
* @dev public function to set the token URI for a given token
* Reverts if the token ID does not exist or metadata has migrated to IPFS
* @param tokenId uint256 ID of the token to set its URI
* @param uri string URI to assign
*/
function setTokenURI(uint256 tokenId, string memory uri) public onlyMinter {
require(!_ipfsMigrated);
_setTokenURI(tokenId, uri);
}
/**
* @dev Returns the 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));
if (bytes(_tokenURIs[tokenId]).length > 0)
return _tokenURIs[tokenId];
return Strings.strConcat(baseTokenURI(),Strings.uint2str(tokenId));
}
/**
* @dev Sets the prefix of token URI
* @param baseTokenURI token URI prefix to be set
*/
function setBaseTokenURI(string memory baseTokenURI) public onlyMinter {
_baseTokenURI = baseTokenURI;
}
/**
* @dev Returns prefix of token URI
* @return string representing the token URI prefix
*/
function baseTokenURI() public view returns (string memory) {
return _baseTokenURI;
}
/**
* @dev Returns the properties for a given token ID
* Throws if the token ID does not exist.
* @param tokenId uint256 ID of the token to query
*/
function tokenProperties(uint256 tokenId) public view returns (uint256) {
require(_exists(tokenId));
return _tokenProperties[tokenId];
}
/**
* @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 whenNotPaused {
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 whenNotPaused {
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 whenNotPaused {
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 Public function to mint a new token
* Reverts if the given token ID already exists
* @param to address The address that will own the minted token
* @param tokenId uint256 ID of the token to be minted
* @param uri string Metadata URI of the token to be minted
* @param tokenProps uint256 Properties of the token to be minted
*/
function mint(address to, uint256 tokenId, string memory uri, uint256 tokenProps)
public onlyMinter
{
_mint(to, tokenId, uri, tokenProps);
_totalSupply += 1;
}
/**
* @dev Public function to mint a batch of new tokens
* Reverts if some the given token IDs already exist
* @param to address[] List of addresses that will own the minted tokens
* @param tokenIds uint256[] List of IDs of the tokens to be minted
* @param tokenURIs bytes[] Concatenated metadata URIs of the tokens to be minted
* @param urisLengths uint8[] Lengths of the metadata URIs in the tokenURIs parameter
* @param tokenProps uint256[] List of properties of the tokens to be minted
*/
function batchMint(
address[] memory to,
uint256[] memory tokenIds,
bytes memory tokenURIs,
uint8[] memory urisLengths,
uint256[] memory tokenProps)
public onlyMinter
{
require(tokenIds.length == to.length &&
tokenIds.length == urisLengths.length &&
tokenIds.length == tokenProps.length);
bytes[] memory uris = Strings.split(tokenURIs, urisLengths);
for (uint i = 0; i < tokenIds.length; i++) {
_mint(to[i], tokenIds[i], string(uris[i]), tokenProps[i]);
}
_totalSupply += tokenIds.length;
}
/**
* @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
* @param uri string URI of the token to be minted metadata
* @param tokenProps uint256 properties of the token to be minted
*/
function _mint(address to, uint256 tokenId, string memory uri, uint256 tokenProps) internal {
require(to != address(0));
require(!_exists(tokenId));
_tokenOwner[tokenId] = to;
_ownedTokensCount[to] = _ownedTokensCount[to].add(1);
_setTokenURI(tokenId, uri);
_tokenProperties[tokenId] = tokenProps;
emit Transfer(address(0), to, 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;
emit TokenURI(tokenId, uri);
}
/**
* @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);
}
}
}
contract DeltaTimeNFT is DeltaTimeNFTBase {
constructor (string memory baseTokenURI) public DeltaTimeNFTBase("F1® Delta Time", "F1DT", baseTokenURI) {
}
function tokenType(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return properties & 0xFF;
}
function tokenSubType(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFF << 8)) >> 8;
}
function tokenTeam(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFF << 16)) >> 16;
}
function tokenSeason(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFF << 24)) >> 24;
}
function tokenRarity(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFF << 32)) >> 32;
}
function tokenTrack(uint256 tokenId) public view returns (uint256) {
// only CarNFT, DriverNFT, CarCompNFT, DriverCompNFT and TyreNFT has a track id
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFF << 40)) >> 40;
}
function tokenCollection(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFFFF << 48)) >> 48;
}
function tokenDriverNumber(uint256 tokenId) public view returns (uint256) {
// only Car and Driver has a driver id
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFFFF << 64)) >> 64;
}
function tokenRacingProperty1(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFFFF << 80)) >> 80;
}
function tokenRacingProperty2(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFFFF << 96)) >> 96;
}
function tokenRacingProperty3(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFFFF << 112)) >> 112;
}
function tokenLuck(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFFFF << 128)) >> 128;
}
function tokenEffect(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFF << 144)) >> 144;
}
function tokenSpecial1(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFFFF << 152)) >> 152;
}
function tokenSpecial2(uint256 tokenId) public view returns (uint256) {
uint256 properties = tokenProperties(tokenId);
return (properties & (0xFFFF << 168)) >> 168;
}
}