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Overview
ETH Balance
0 ETH
Eth Value
$0.00Token Holdings
- ERC-20 Tokens (1)View All Holdings77.5 EBK
Ebakus
More Info
Private Name Tags
ContractCreator
Latest 25 from a total of 52 transactions
| Transaction Hash |
Method
|
Block
|
From
|
To
|
|||||
|---|---|---|---|---|---|---|---|---|---|
| Withdraw | 9556697 | 1716 days ago | IN | 0 ETH | 0.00025304 | ||||
| Withdraw | 9556412 | 1716 days ago | IN | 0 ETH | 0.00015809 | ||||
| Purchase | 7136911 | 2110 days ago | IN | 0.5 ETH | 0.00018671 | ||||
| Withdraw | 6767993 | 2174 days ago | IN | 0 ETH | 0.00011182 | ||||
| Set Addresses | 6767993 | 2174 days ago | IN | 0 ETH | 0.00011431 | ||||
| Set Addresses | 6767993 | 2174 days ago | IN | 0 ETH | 0.00011431 | ||||
| Purchase | 6689850 | 2187 days ago | IN | 0.25 ETH | 0.00257609 | ||||
| Purchase | 6689841 | 2187 days ago | IN | 0.5 ETH | 0.00631975 | ||||
| Purchase | 6689787 | 2187 days ago | IN | 0.25 ETH | 0.00225945 | ||||
| Set Withdrawer | 6689362 | 2187 days ago | IN | 0 ETH | 0.00021793 | ||||
| Purchase | 6687616 | 2187 days ago | IN | 2.5 ETH | 0.02299532 | ||||
| Purchase | 6687600 | 2187 days ago | IN | 2.5 ETH | 0.02294771 | ||||
| Purchase | 6687590 | 2187 days ago | IN | 2.5 ETH | 0.02292416 | ||||
| Purchase | 6687585 | 2187 days ago | IN | 2.5 ETH | 0.0233319 | ||||
| Purchase | 6687575 | 2187 days ago | IN | 2.5 ETH | 0.02306835 | ||||
| Purchase | 6687544 | 2187 days ago | IN | 2.5 ETH | 0.02302073 | ||||
| Purchase | 6687508 | 2187 days ago | IN | 2.5 ETH | 0.01738106 | ||||
| Purchase | 6687497 | 2187 days ago | IN | 2.5 ETH | 0.02001759 | ||||
| Purchase | 6687459 | 2187 days ago | IN | 2.5 ETH | 0.01432026 | ||||
| Purchase | 6687441 | 2187 days ago | IN | 2.5 ETH | 0.01440308 | ||||
| Purchase | 6687437 | 2187 days ago | IN | 2.5 ETH | 0.01750807 | ||||
| Purchase | 6687425 | 2187 days ago | IN | 2.5 ETH | 0.01446456 | ||||
| Purchase | 6687386 | 2187 days ago | IN | 2.5 ETH | 0.01173673 | ||||
| Purchase | 6687361 | 2187 days ago | IN | 2.5 ETH | 0.01151072 | ||||
| Purchase | 6687344 | 2187 days ago | IN | 2.5 ETH | 0.01168353 |
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Contract Name:
CryptantCrabPresale
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/**
*Submitted for verification at Etherscan.io on 2018-11-12
*/
pragma solidity 0.4.24;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
/**
* @dev Multiplies two numbers, throws on overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
// Gas optimization: this is cheaper than asserting '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;
}
c = a * b;
assert(c / a == b);
return c;
}
/**
* @dev Integer division of two numbers, truncating the quotient.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
// uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return a / b;
}
/**
* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
/**
* @dev Adds two numbers, throws on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
c = a + b;
assert(c >= a);
return c;
}
}
/**
* @title Roles
* @author Francisco Giordano (@frangio)
* @dev Library for managing addresses assigned to a Role.
* See RBAC.sol for example usage.
*/
library Roles {
struct Role {
mapping (address => bool) bearer;
}
/**
* @dev give an address access to this role
*/
function add(Role storage role, address addr)
internal
{
role.bearer[addr] = true;
}
/**
* @dev remove an address' access to this role
*/
function remove(Role storage role, address addr)
internal
{
role.bearer[addr] = false;
}
/**
* @dev check if an address has this role
* // reverts
*/
function check(Role storage role, address addr)
view
internal
{
require(has(role, addr));
}
/**
* @dev check if an address has this role
* @return bool
*/
function has(Role storage role, address addr)
view
internal
returns (bool)
{
return role.bearer[addr];
}
}
/**
* @title RBAC (Role-Based Access Control)
* @author Matt Condon (@Shrugs)
* @dev Stores and provides setters and getters for roles and addresses.
* Supports unlimited numbers of roles and addresses.
* See //contracts/mocks/RBACMock.sol for an example of usage.
* This RBAC method uses strings to key roles. It may be beneficial
* for you to write your own implementation of this interface using Enums or similar.
* It's also recommended that you define constants in the contract, like ROLE_ADMIN below,
* to avoid typos.
*/
contract RBAC {
using Roles for Roles.Role;
mapping (string => Roles.Role) private roles;
event RoleAdded(address indexed operator, string role);
event RoleRemoved(address indexed operator, string role);
/**
* @dev reverts if addr does not have role
* @param _operator address
* @param _role the name of the role
* // reverts
*/
function checkRole(address _operator, string _role)
view
public
{
roles[_role].check(_operator);
}
/**
* @dev determine if addr has role
* @param _operator address
* @param _role the name of the role
* @return bool
*/
function hasRole(address _operator, string _role)
view
public
returns (bool)
{
return roles[_role].has(_operator);
}
/**
* @dev add a role to an address
* @param _operator address
* @param _role the name of the role
*/
function addRole(address _operator, string _role)
internal
{
roles[_role].add(_operator);
emit RoleAdded(_operator, _role);
}
/**
* @dev remove a role from an address
* @param _operator address
* @param _role the name of the role
*/
function removeRole(address _operator, string _role)
internal
{
roles[_role].remove(_operator);
emit RoleRemoved(_operator, _role);
}
/**
* @dev modifier to scope access to a single role (uses msg.sender as addr)
* @param _role the name of the role
* // reverts
*/
modifier onlyRole(string _role)
{
checkRole(msg.sender, _role);
_;
}
/**
* @dev modifier to scope access to a set of roles (uses msg.sender as addr)
* @param _roles the names of the roles to scope access to
* // reverts
*
* @TODO - when solidity supports dynamic arrays as arguments to modifiers, provide this
* see: https://github.com/ethereum/solidity/issues/2467
*/
// modifier onlyRoles(string[] _roles) {
// bool hasAnyRole = false;
// for (uint8 i = 0; i < _roles.length; i++) {
// if (hasRole(msg.sender, _roles[i])) {
// hasAnyRole = true;
// break;
// }
// }
// require(hasAnyRole);
// _;
// }
}
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;
event OwnershipRenounced(address indexed previousOwner);
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
constructor() public {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to relinquish control of the contract.
* @notice Renouncing to ownership will leave the contract without an owner.
* It will not be possible to call the functions with the `onlyOwner`
* modifier anymore.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipRenounced(owner);
owner = address(0);
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param _newOwner The address to transfer ownership to.
*/
function transferOwnership(address _newOwner) public onlyOwner {
_transferOwnership(_newOwner);
}
/**
* @dev Transfers control of the contract to a newOwner.
* @param _newOwner The address to transfer ownership to.
*/
function _transferOwnership(address _newOwner) internal {
require(_newOwner != address(0));
emit OwnershipTransferred(owner, _newOwner);
owner = _newOwner;
}
}
/**
* @title Contracts that should not own Ether
* @author Remco Bloemen <remco@2π.com>
* @dev This tries to block incoming ether to prevent accidental loss of Ether. Should Ether end up
* in the contract, it will allow the owner to reclaim this ether.
* @notice Ether can still be sent to this contract by:
* calling functions labeled `payable`
* `selfdestruct(contract_address)`
* mining directly to the contract address
*/
contract HasNoEther is Ownable {
/**
* @dev Constructor that rejects incoming Ether
* The `payable` flag is added so we can access `msg.value` without compiler warning. If we
* leave out payable, then Solidity will allow inheriting contracts to implement a payable
* constructor. By doing it this way we prevent a payable constructor from working. Alternatively
* we could use assembly to access msg.value.
*/
constructor() public payable {
require(msg.value == 0);
}
/**
* @dev Disallows direct send by settings a default function without the `payable` flag.
*/
function() external {
}
/**
* @dev Transfer all Ether held by the contract to the owner.
*/
function reclaimEther() external onlyOwner {
owner.transfer(address(this).balance);
}
}
/**
* @title Whitelist
* @dev The Whitelist contract has a whitelist of addresses, and provides basic authorization control functions.
* This simplifies the implementation of "user permissions".
*/
contract Whitelist is Ownable, RBAC {
string public constant ROLE_WHITELISTED = "whitelist";
/**
* @dev Throws if operator is not whitelisted.
* @param _operator address
*/
modifier onlyIfWhitelisted(address _operator) {
checkRole(_operator, ROLE_WHITELISTED);
_;
}
/**
* @dev add an address to the whitelist
* @param _operator address
* @return true if the address was added to the whitelist, false if the address was already in the whitelist
*/
function addAddressToWhitelist(address _operator)
onlyOwner
public
{
addRole(_operator, ROLE_WHITELISTED);
}
/**
* @dev getter to determine if address is in whitelist
*/
function whitelist(address _operator)
public
view
returns (bool)
{
return hasRole(_operator, ROLE_WHITELISTED);
}
/**
* @dev add addresses to the whitelist
* @param _operators addresses
* @return true if at least one address was added to the whitelist,
* false if all addresses were already in the whitelist
*/
function addAddressesToWhitelist(address[] _operators)
onlyOwner
public
{
for (uint256 i = 0; i < _operators.length; i++) {
addAddressToWhitelist(_operators[i]);
}
}
/**
* @dev remove an address from the whitelist
* @param _operator address
* @return true if the address was removed from the whitelist,
* false if the address wasn't in the whitelist in the first place
*/
function removeAddressFromWhitelist(address _operator)
onlyOwner
public
{
removeRole(_operator, ROLE_WHITELISTED);
}
/**
* @dev remove addresses from the whitelist
* @param _operators addresses
* @return true if at least one address was removed from the whitelist,
* false if all addresses weren't in the whitelist in the first place
*/
function removeAddressesFromWhitelist(address[] _operators)
onlyOwner
public
{
for (uint256 i = 0; i < _operators.length; i++) {
removeAddressFromWhitelist(_operators[i]);
}
}
}
/**
* Utility library of inline functions on addresses
*/
library AddressUtils {
/**
* 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 addr address to check
* @return whether the target address is a contract
*/
function isContract(address addr) 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.
// solium-disable-next-line security/no-inline-assembly
assembly { size := extcodesize(addr) }
return size > 0;
}
}
/**
* @title ERC165
* @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
*/
interface ERC165 {
/**
* @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 SupportsInterfaceWithLookup
* @author Matt Condon (@shrugs)
* @dev Implements ERC165 using a lookup table.
*/
contract SupportsInterfaceWithLookup is ERC165 {
bytes4 public constant InterfaceId_ERC165 = 0x01ffc9a7;
/**
* 0x01ffc9a7 ===
* bytes4(keccak256('supportsInterface(bytes4)'))
*/
/**
* @dev a mapping of interface id to whether or not it's supported
*/
mapping(bytes4 => bool) internal supportedInterfaces;
/**
* @dev A contract implementing SupportsInterfaceWithLookup
* implement ERC165 itself
*/
constructor()
public
{
_registerInterface(InterfaceId_ERC165);
}
/**
* @dev implement supportsInterface(bytes4) using a lookup table
*/
function supportsInterface(bytes4 _interfaceId)
external
view
returns (bool)
{
return supportedInterfaces[_interfaceId];
}
/**
* @dev private method for registering an interface
*/
function _registerInterface(bytes4 _interfaceId)
internal
{
require(_interfaceId != 0xffffffff);
supportedInterfaces[_interfaceId] = true;
}
}
/**
* @title ERC721 Non-Fungible Token Standard basic interface
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Basic is ERC165 {
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 exists(uint256 _tokenId) public view returns (bool _exists);
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 _data
)
public;
}
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
contract ERC721Receiver {
/**
* @dev Magic value to be returned upon successful reception of an NFT
* Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`,
* which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
*/
bytes4 internal constant ERC721_RECEIVED = 0x150b7a02;
/**
* @notice Handle the receipt of an NFT
* @dev The ERC721 smart contract calls this function on the recipient
* after a `safetransfer`. This function MAY throw to revert and reject the
* transfer. Return of other than the magic value MUST result in the
* transaction being reverted.
* Note: the 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 transfered
* @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 _data
)
public
returns(bytes4);
}
/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Enumerable is ERC721Basic {
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);
}
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Metadata is ERC721Basic {
function name() external view returns (string _name);
function symbol() external view returns (string _symbol);
function tokenURI(uint256 _tokenId) public view returns (string);
}
/**
* @title ERC-721 Non-Fungible Token Standard, full implementation interface
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721 is ERC721Basic, ERC721Enumerable, ERC721Metadata {
}
/**
* @title ERC721 Non-Fungible Token Standard basic implementation
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721BasicToken is SupportsInterfaceWithLookup, ERC721Basic {
bytes4 private constant InterfaceId_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 InterfaceId_ERC721Exists = 0x4f558e79;
/*
* 0x4f558e79 ===
* bytes4(keccak256('exists(uint256)'))
*/
using SafeMath for uint256;
using AddressUtils for address;
// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
// which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
bytes4 private constant ERC721_RECEIVED = 0x150b7a02;
// Mapping from token ID to owner
mapping (uint256 => address) internal tokenOwner;
// Mapping from token ID to approved address
mapping (uint256 => address) internal tokenApprovals;
// Mapping from owner to number of owned token
mapping (address => uint256) internal ownedTokensCount;
// Mapping from owner to operator approvals
mapping (address => mapping (address => bool)) internal operatorApprovals;
/**
* @dev Guarantees msg.sender is owner of the given token
* @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender
*/
modifier onlyOwnerOf(uint256 _tokenId) {
require(ownerOf(_tokenId) == msg.sender);
_;
}
/**
* @dev Checks msg.sender can transfer a token, by being owner, approved, or operator
* @param _tokenId uint256 ID of the token to validate
*/
modifier canTransfer(uint256 _tokenId) {
require(isApprovedOrOwner(msg.sender, _tokenId));
_;
}
constructor()
public
{
// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(InterfaceId_ERC721);
_registerInterface(InterfaceId_ERC721Exists);
}
/**
* @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 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) public view returns (bool) {
address owner = tokenOwner[_tokenId];
return owner != address(0);
}
/**
* @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
* @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) {
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
canTransfer(_tokenId)
{
require(_from != address(0));
require(_to != address(0));
clearApproval(_from, _tokenId);
removeTokenFrom(_from, _tokenId);
addTokenTo(_to, _tokenId);
emit Transfer(_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
canTransfer(_tokenId)
{
// solium-disable-next-line arg-overflow
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 _data
)
public
canTransfer(_tokenId)
{
transferFrom(_from, _to, _tokenId);
// solium-disable-next-line arg-overflow
require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
}
/**
* @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);
// Disable solium check because of
// https://github.com/duaraghav8/Solium/issues/175
// solium-disable-next-line operator-whitespace
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 by the msg.sender
*/
function _mint(address _to, uint256 _tokenId) internal {
require(_to != address(0));
addTokenTo(_to, _tokenId);
emit Transfer(address(0), _to, _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 by the msg.sender
*/
function _burn(address _owner, uint256 _tokenId) internal {
clearApproval(_owner, _tokenId);
removeTokenFrom(_owner, _tokenId);
emit Transfer(_owner, address(0), _tokenId);
}
/**
* @dev Internal function to clear current approval of a given token ID
* Reverts if the given address is not indeed the owner of the token
* @param _owner owner of the token
* @param _tokenId uint256 ID of the token to be transferred
*/
function clearApproval(address _owner, uint256 _tokenId) internal {
require(ownerOf(_tokenId) == _owner);
if (tokenApprovals[_tokenId] != address(0)) {
tokenApprovals[_tokenId] = address(0);
}
}
/**
* @dev Internal function to add a token ID to the list of a given address
* @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 addTokenTo(address _to, uint256 _tokenId) internal {
require(tokenOwner[_tokenId] == address(0));
tokenOwner[_tokenId] = _to;
ownedTokensCount[_to] = ownedTokensCount[_to].add(1);
}
/**
* @dev Internal function to remove a token ID from the list of a given address
* @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 removeTokenFrom(address _from, uint256 _tokenId) internal {
require(ownerOf(_tokenId) == _from);
ownedTokensCount[_from] = ownedTokensCount[_from].sub(1);
tokenOwner[_tokenId] = address(0);
}
/**
* @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 checkAndCallSafeTransfer(
address _from,
address _to,
uint256 _tokenId,
bytes _data
)
internal
returns (bool)
{
if (!_to.isContract()) {
return true;
}
bytes4 retval = ERC721Receiver(_to).onERC721Received(
msg.sender, _from, _tokenId, _data);
return (retval == ERC721_RECEIVED);
}
}
/**
* @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 ERC721Token is SupportsInterfaceWithLookup, ERC721BasicToken, ERC721 {
bytes4 private constant InterfaceId_ERC721Enumerable = 0x780e9d63;
/**
* 0x780e9d63 ===
* bytes4(keccak256('totalSupply()')) ^
* bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
* bytes4(keccak256('tokenByIndex(uint256)'))
*/
bytes4 private constant InterfaceId_ERC721Metadata = 0x5b5e139f;
/**
* 0x5b5e139f ===
* bytes4(keccak256('name()')) ^
* bytes4(keccak256('symbol()')) ^
* bytes4(keccak256('tokenURI(uint256)'))
*/
// Token name
string internal name_;
// Token symbol
string internal symbol_;
// Mapping from owner to list of owned token IDs
mapping(address => uint256[]) internal ownedTokens;
// Mapping from token ID to index of the owner tokens list
mapping(uint256 => uint256) internal ownedTokensIndex;
// Array with all token ids, used for enumeration
uint256[] internal allTokens;
// Mapping from token id to position in the allTokens array
mapping(uint256 => uint256) internal allTokensIndex;
// Optional mapping for token URIs
mapping(uint256 => string) internal tokenURIs;
/**
* @dev Constructor function
*/
constructor(string _name, string _symbol) public {
name_ = _name;
symbol_ = _symbol;
// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(InterfaceId_ERC721Enumerable);
_registerInterface(InterfaceId_ERC721Metadata);
}
/**
* @dev Gets the token name
* @return string representing the token name
*/
function name() external view returns (string) {
return name_;
}
/**
* @dev Gets the token symbol
* @return string representing the token symbol
*/
function symbol() external view returns (string) {
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) public view returns (string) {
require(exists(_tokenId));
return tokenURIs[_tokenId];
}
/**
* @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 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 _uri) internal {
require(exists(_tokenId));
tokenURIs[_tokenId] = _uri;
}
/**
* @dev Internal function to add a token ID to the list of a given address
* @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 addTokenTo(address _to, uint256 _tokenId) internal {
super.addTokenTo(_to, _tokenId);
uint256 length = ownedTokens[_to].length;
ownedTokens[_to].push(_tokenId);
ownedTokensIndex[_tokenId] = length;
}
/**
* @dev Internal function to remove a token ID from the list of a given address
* @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 removeTokenFrom(address _from, uint256 _tokenId) internal {
super.removeTokenFrom(_from, _tokenId);
uint256 tokenIndex = ownedTokensIndex[_tokenId];
uint256 lastTokenIndex = ownedTokens[_from].length.sub(1);
uint256 lastToken = ownedTokens[_from][lastTokenIndex];
ownedTokens[_from][tokenIndex] = lastToken;
ownedTokens[_from][lastTokenIndex] = 0;
// Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to
// be zero. Then we can make sure that we will remove _tokenId from the ownedTokens list since we are first swapping
// the lastToken to the first position, and then dropping the element placed in the last position of the list
ownedTokens[_from].length--;
ownedTokensIndex[_tokenId] = 0;
ownedTokensIndex[lastToken] = tokenIndex;
}
/**
* @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 by the msg.sender
*/
function _mint(address _to, uint256 _tokenId) internal {
super._mint(_to, _tokenId);
allTokensIndex[_tokenId] = allTokens.length;
allTokens.push(_tokenId);
}
/**
* @dev Internal function to burn a specific token
* Reverts if the token does not exist
* @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];
}
// Reorg all tokens array
uint256 tokenIndex = allTokensIndex[_tokenId];
uint256 lastTokenIndex = allTokens.length.sub(1);
uint256 lastToken = allTokens[lastTokenIndex];
allTokens[tokenIndex] = lastToken;
allTokens[lastTokenIndex] = 0;
allTokens.length--;
allTokensIndex[_tokenId] = 0;
allTokensIndex[lastToken] = tokenIndex;
}
}
contract CryptantCrabStoreInterface {
function createAddress(bytes32 key, address value) external returns (bool);
function createAddresses(bytes32[] keys, address[] values) external returns (bool);
function updateAddress(bytes32 key, address value) external returns (bool);
function updateAddresses(bytes32[] keys, address[] values) external returns (bool);
function removeAddress(bytes32 key) external returns (bool);
function removeAddresses(bytes32[] keys) external returns (bool);
function readAddress(bytes32 key) external view returns (address);
function readAddresses(bytes32[] keys) external view returns (address[]);
// Bool related functions
function createBool(bytes32 key, bool value) external returns (bool);
function createBools(bytes32[] keys, bool[] values) external returns (bool);
function updateBool(bytes32 key, bool value) external returns (bool);
function updateBools(bytes32[] keys, bool[] values) external returns (bool);
function removeBool(bytes32 key) external returns (bool);
function removeBools(bytes32[] keys) external returns (bool);
function readBool(bytes32 key) external view returns (bool);
function readBools(bytes32[] keys) external view returns (bool[]);
// Bytes32 related functions
function createBytes32(bytes32 key, bytes32 value) external returns (bool);
function createBytes32s(bytes32[] keys, bytes32[] values) external returns (bool);
function updateBytes32(bytes32 key, bytes32 value) external returns (bool);
function updateBytes32s(bytes32[] keys, bytes32[] values) external returns (bool);
function removeBytes32(bytes32 key) external returns (bool);
function removeBytes32s(bytes32[] keys) external returns (bool);
function readBytes32(bytes32 key) external view returns (bytes32);
function readBytes32s(bytes32[] keys) external view returns (bytes32[]);
// uint256 related functions
function createUint256(bytes32 key, uint256 value) external returns (bool);
function createUint256s(bytes32[] keys, uint256[] values) external returns (bool);
function updateUint256(bytes32 key, uint256 value) external returns (bool);
function updateUint256s(bytes32[] keys, uint256[] values) external returns (bool);
function removeUint256(bytes32 key) external returns (bool);
function removeUint256s(bytes32[] keys) external returns (bool);
function readUint256(bytes32 key) external view returns (uint256);
function readUint256s(bytes32[] keys) external view returns (uint256[]);
// int256 related functions
function createInt256(bytes32 key, int256 value) external returns (bool);
function createInt256s(bytes32[] keys, int256[] values) external returns (bool);
function updateInt256(bytes32 key, int256 value) external returns (bool);
function updateInt256s(bytes32[] keys, int256[] values) external returns (bool);
function removeInt256(bytes32 key) external returns (bool);
function removeInt256s(bytes32[] keys) external returns (bool);
function readInt256(bytes32 key) external view returns (int256);
function readInt256s(bytes32[] keys) external view returns (int256[]);
// internal functions
function parseKey(bytes32 key) internal pure returns (bytes32);
function parseKeys(bytes32[] _keys) internal pure returns (bytes32[]);
}
interface GenesisCrabInterface {
function generateCrabGene(bool isPresale, bool hasLegendaryPart) external returns (uint256 _gene, uint256 _skin, uint256 _heartValue, uint256 _growthValue);
function mutateCrabPart(uint256 _part, uint256 _existingPartGene, uint256 _legendaryPercentage) external view returns (uint256);
function generateCrabHeart() external view returns (uint256, uint256);
}
contract CrabData {
modifier crabDataLength(uint256[] memory _crabData) {
require(_crabData.length == 8);
_;
}
struct CrabPartData {
uint256 hp;
uint256 dps;
uint256 blockRate;
uint256 resistanceBonus;
uint256 hpBonus;
uint256 dpsBonus;
uint256 blockBonus;
uint256 mutiplierBonus;
}
function arrayToCrabPartData(
uint256[] _partData
)
internal
pure
crabDataLength(_partData)
returns (CrabPartData memory _parsedData)
{
_parsedData = CrabPartData(
_partData[0], // hp
_partData[1], // dps
_partData[2], // block rate
_partData[3], // resistance bonus
_partData[4], // hp bonus
_partData[5], // dps bonus
_partData[6], // block bonus
_partData[7]); // multiplier bonus
}
function crabPartDataToArray(CrabPartData _crabPartData) internal pure returns (uint256[] memory _resultData) {
_resultData = new uint256[](8);
_resultData[0] = _crabPartData.hp;
_resultData[1] = _crabPartData.dps;
_resultData[2] = _crabPartData.blockRate;
_resultData[3] = _crabPartData.resistanceBonus;
_resultData[4] = _crabPartData.hpBonus;
_resultData[5] = _crabPartData.dpsBonus;
_resultData[6] = _crabPartData.blockBonus;
_resultData[7] = _crabPartData.mutiplierBonus;
}
}
contract GeneSurgeon {
//0 - filler, 1 - body, 2 - leg, 3 - left claw, 4 - right claw
uint256[] internal crabPartMultiplier = [0, 10**9, 10**6, 10**3, 1];
function extractElementsFromGene(uint256 _gene) internal view returns (uint256[] memory _elements) {
_elements = new uint256[](4);
_elements[0] = _gene / crabPartMultiplier[1] / 100 % 10;
_elements[1] = _gene / crabPartMultiplier[2] / 100 % 10;
_elements[2] = _gene / crabPartMultiplier[3] / 100 % 10;
_elements[3] = _gene / crabPartMultiplier[4] / 100 % 10;
}
function extractPartsFromGene(uint256 _gene) internal view returns (uint256[] memory _parts) {
_parts = new uint256[](4);
_parts[0] = _gene / crabPartMultiplier[1] % 100;
_parts[1] = _gene / crabPartMultiplier[2] % 100;
_parts[2] = _gene / crabPartMultiplier[3] % 100;
_parts[3] = _gene / crabPartMultiplier[4] % 100;
}
}
contract CryptantCrabNFT is ERC721Token, Whitelist, CrabData, GeneSurgeon {
event CrabPartAdded(uint256 hp, uint256 dps, uint256 blockAmount);
event GiftTransfered(address indexed _from, address indexed _to, uint256 indexed _tokenId);
event DefaultMetadataURIChanged(string newUri);
/**
* @dev Pre-generated keys to save gas
* keys are generated with:
* CRAB_BODY = bytes4(keccak256("crab_body")) = 0xc398430e
* CRAB_LEG = bytes4(keccak256("crab_leg")) = 0x889063b1
* CRAB_LEFT_CLAW = bytes4(keccak256("crab_left_claw")) = 0xdb6290a2
* CRAB_RIGHT_CLAW = bytes4(keccak256("crab_right_claw")) = 0x13453f89
*/
bytes4 internal constant CRAB_BODY = 0xc398430e;
bytes4 internal constant CRAB_LEG = 0x889063b1;
bytes4 internal constant CRAB_LEFT_CLAW = 0xdb6290a2;
bytes4 internal constant CRAB_RIGHT_CLAW = 0x13453f89;
/**
* @dev Stores all the crab data
*/
mapping(bytes4 => mapping(uint256 => CrabPartData[])) internal crabPartData;
/**
* @dev Mapping from tokenId to its corresponding special skin
* tokenId with default skin will not be stored.
*/
mapping(uint256 => uint256) internal crabSpecialSkins;
/**
* @dev default MetadataURI
*/
string public defaultMetadataURI = "https://www.cryptantcrab.io/md/";
constructor(string _name, string _symbol) public ERC721Token(_name, _symbol) {
// constructor
initiateCrabPartData();
}
/**
* @dev Returns an URI for a given token ID
* Throws if the token ID does not exist.
* Will return the token's metadata URL if it has one,
* otherwise will just return base on the default metadata URI
* @param _tokenId uint256 ID of the token to query
*/
function tokenURI(uint256 _tokenId) public view returns (string) {
require(exists(_tokenId));
string memory _uri = tokenURIs[_tokenId];
if(bytes(_uri).length == 0) {
_uri = getMetadataURL(bytes(defaultMetadataURI), _tokenId);
}
return _uri;
}
/**
* @dev Returns the data of a specific parts
* @param _partIndex the part to retrieve. 1 = Body, 2 = Legs, 3 = Left Claw, 4 = Right Claw
* @param _element the element of part to retrieve. 1 = Fire, 2 = Earth, 3 = Metal, 4 = Spirit, 5 = Water
* @param _setIndex the set index of for the specified part. This will starts from 1.
*/
function dataOfPart(uint256 _partIndex, uint256 _element, uint256 _setIndex) public view returns (uint256[] memory _resultData) {
bytes4 _key;
if(_partIndex == 1) {
_key = CRAB_BODY;
} else if(_partIndex == 2) {
_key = CRAB_LEG;
} else if(_partIndex == 3) {
_key = CRAB_LEFT_CLAW;
} else if(_partIndex == 4) {
_key = CRAB_RIGHT_CLAW;
} else {
revert();
}
CrabPartData storage _crabPartData = crabPartData[_key][_element][_setIndex];
_resultData = crabPartDataToArray(_crabPartData);
}
/**
* @dev Gift(Transfer) a token to another address. Caller must be token owner
* @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 giftToken(address _from, address _to, uint256 _tokenId) external {
safeTransferFrom(_from, _to, _tokenId);
emit GiftTransfered(_from, _to, _tokenId);
}
/**
* @dev External function to mint a new token, for whitelisted address only.
* Reverts if the given token ID already exists
* @param _tokenOwner address the beneficiary that will own the minted token
* @param _tokenId uint256 ID of the token to be minted by the msg.sender
* @param _skinId the skin ID to be applied for all the token minted
*/
function mintToken(address _tokenOwner, uint256 _tokenId, uint256 _skinId) external onlyIfWhitelisted(msg.sender) {
super._mint(_tokenOwner, _tokenId);
if(_skinId > 0) {
crabSpecialSkins[_tokenId] = _skinId;
}
}
/**
* @dev Returns crab data base on the gene provided
* @param _gene the gene info where crab data will be retrieved base on it
* @return 4 uint arrays:
* 1st Array = Body's Data
* 2nd Array = Leg's Data
* 3rd Array = Left Claw's Data
* 4th Array = Right Claw's Data
*/
function crabPartDataFromGene(uint256 _gene) external view returns (
uint256[] _bodyData,
uint256[] _legData,
uint256[] _leftClawData,
uint256[] _rightClawData
) {
uint256[] memory _parts = extractPartsFromGene(_gene);
uint256[] memory _elements = extractElementsFromGene(_gene);
_bodyData = dataOfPart(1, _elements[0], _parts[0]);
_legData = dataOfPart(2, _elements[1], _parts[1]);
_leftClawData = dataOfPart(3, _elements[2], _parts[2]);
_rightClawData = dataOfPart(4, _elements[3], _parts[3]);
}
/**
* @dev For developer to add new parts, notice that this is the only method to add crab data
* so that developer can add extra content. there's no other method for developer to modify
* the data. This is to assure token owner actually owns their data.
* @param _partIndex the part to add. 1 = Body, 2 = Legs, 3 = Left Claw, 4 = Right Claw
* @param _element the element of part to add. 1 = Fire, 2 = Earth, 3 = Metal, 4 = Spirit, 5 = Water
* @param _partDataArray data of the parts.
*/
function setPartData(uint256 _partIndex, uint256 _element, uint256[] _partDataArray) external onlyOwner {
CrabPartData memory _partData = arrayToCrabPartData(_partDataArray);
bytes4 _key;
if(_partIndex == 1) {
_key = CRAB_BODY;
} else if(_partIndex == 2) {
_key = CRAB_LEG;
} else if(_partIndex == 3) {
_key = CRAB_LEFT_CLAW;
} else if(_partIndex == 4) {
_key = CRAB_RIGHT_CLAW;
}
// if index 1 is empty will fill at index 1
if(crabPartData[_key][_element][1].hp == 0 && crabPartData[_key][_element][1].dps == 0) {
crabPartData[_key][_element][1] = _partData;
} else {
crabPartData[_key][_element].push(_partData);
}
emit CrabPartAdded(_partDataArray[0], _partDataArray[1], _partDataArray[2]);
}
/**
* @dev Updates the default metadata URI
* @param _defaultUri the new metadata URI
*/
function setDefaultMetadataURI(string _defaultUri) external onlyOwner {
defaultMetadataURI = _defaultUri;
emit DefaultMetadataURIChanged(_defaultUri);
}
/**
* @dev Updates the metadata URI for existing token
* @param _tokenId the tokenID that metadata URI to be changed
* @param _uri the new metadata URI for the specified token
*/
function setTokenURI(uint256 _tokenId, string _uri) external onlyIfWhitelisted(msg.sender) {
_setTokenURI(_tokenId, _uri);
}
/**
* @dev Returns the special skin of the provided tokenId
* @param _tokenId cryptant crab's tokenId
* @return Special skin belongs to the _tokenId provided.
* 0 will be returned if no special skin found.
*/
function specialSkinOfTokenId(uint256 _tokenId) external view returns (uint256) {
return crabSpecialSkins[_tokenId];
}
/**
* @dev This functions will adjust the length of crabPartData
* so that when adding data the index can start with 1.
* Reason of doing this is because gene cannot have parts with index 0.
*/
function initiateCrabPartData() internal {
require(crabPartData[CRAB_BODY][1].length == 0);
for(uint256 i = 1 ; i <= 5 ; i++) {
crabPartData[CRAB_BODY][i].length = 2;
crabPartData[CRAB_LEG][i].length = 2;
crabPartData[CRAB_LEFT_CLAW][i].length = 2;
crabPartData[CRAB_RIGHT_CLAW][i].length = 2;
}
}
/**
* @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,
* or has been whitelisted by contract owner
*/
function isApprovedOrOwner(address _spender, uint256 _tokenId) internal view returns (bool) {
address owner = ownerOf(_tokenId);
return _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender) || whitelist(_spender);
}
/**
* @dev Will merge the uri and tokenId together.
* @param _uri URI to be merge. This will be the first part of the result URL.
* @param _tokenId tokenID to be merge. This will be the last part of the result URL.
* @return the merged urL
*/
function getMetadataURL(bytes _uri, uint256 _tokenId) internal pure returns (string) {
uint256 _tmpTokenId = _tokenId;
uint256 _tokenLength;
// Getting the length(number of digits) of token ID
do {
_tokenLength++;
_tmpTokenId /= 10;
} while (_tmpTokenId > 0);
// creating a byte array with the length of URL + token digits
bytes memory _result = new bytes(_uri.length + _tokenLength);
// cloning the uri bytes into the result bytes
for(uint256 i = 0 ; i < _uri.length ; i ++) {
_result[i] = _uri[i];
}
// appending the tokenId to the end of the result bytes
uint256 lastIndex = _result.length - 1;
for(_tmpTokenId = _tokenId ; _tmpTokenId > 0 ; _tmpTokenId /= 10) {
_result[lastIndex--] = byte(48 + _tmpTokenId % 10);
}
return string(_result);
}
}
contract CryptantCrabBase is Ownable {
GenesisCrabInterface public genesisCrab;
CryptantCrabNFT public cryptantCrabToken;
CryptantCrabStoreInterface public cryptantCrabStorage;
constructor(address _genesisCrabAddress, address _cryptantCrabTokenAddress, address _cryptantCrabStorageAddress) public {
// constructor
_setAddresses(_genesisCrabAddress, _cryptantCrabTokenAddress, _cryptantCrabStorageAddress);
}
function setAddresses(
address _genesisCrabAddress,
address _cryptantCrabTokenAddress,
address _cryptantCrabStorageAddress
)
external onlyOwner {
_setAddresses(_genesisCrabAddress, _cryptantCrabTokenAddress, _cryptantCrabStorageAddress);
}
function _setAddresses(
address _genesisCrabAddress,
address _cryptantCrabTokenAddress,
address _cryptantCrabStorageAddress
)
internal
{
if(_genesisCrabAddress != address(0)) {
GenesisCrabInterface genesisCrabContract = GenesisCrabInterface(_genesisCrabAddress);
genesisCrab = genesisCrabContract;
}
if(_cryptantCrabTokenAddress != address(0)) {
CryptantCrabNFT cryptantCrabTokenContract = CryptantCrabNFT(_cryptantCrabTokenAddress);
cryptantCrabToken = cryptantCrabTokenContract;
}
if(_cryptantCrabStorageAddress != address(0)) {
CryptantCrabStoreInterface cryptantCrabStorageContract = CryptantCrabStoreInterface(_cryptantCrabStorageAddress);
cryptantCrabStorage = cryptantCrabStorageContract;
}
}
}
contract CryptantCrabInformant is CryptantCrabBase{
constructor
(
address _genesisCrabAddress,
address _cryptantCrabTokenAddress,
address _cryptantCrabStorageAddress
)
public
CryptantCrabBase
(
_genesisCrabAddress,
_cryptantCrabTokenAddress,
_cryptantCrabStorageAddress
) {
// constructor
}
function _getCrabData(uint256 _tokenId) internal view returns
(
uint256 _gene,
uint256 _level,
uint256 _exp,
uint256 _mutationCount,
uint256 _trophyCount,
uint256 _heartValue,
uint256 _growthValue
) {
require(cryptantCrabStorage != address(0));
bytes32[] memory keys = new bytes32[](7);
uint256[] memory values;
keys[0] = keccak256(abi.encodePacked(_tokenId, "gene"));
keys[1] = keccak256(abi.encodePacked(_tokenId, "level"));
keys[2] = keccak256(abi.encodePacked(_tokenId, "exp"));
keys[3] = keccak256(abi.encodePacked(_tokenId, "mutationCount"));
keys[4] = keccak256(abi.encodePacked(_tokenId, "trophyCount"));
keys[5] = keccak256(abi.encodePacked(_tokenId, "heartValue"));
keys[6] = keccak256(abi.encodePacked(_tokenId, "growthValue"));
values = cryptantCrabStorage.readUint256s(keys);
// process heart value
uint256 _processedHeartValue;
for(uint256 i = 1 ; i <= 1000 ; i *= 10) {
if(uint256(values[5]) / i % 10 > 0) {
_processedHeartValue += i;
}
}
_gene = values[0];
_level = values[1];
_exp = values[2];
_mutationCount = values[3];
_trophyCount = values[4];
_heartValue = _processedHeartValue;
_growthValue = values[6];
}
function _geneOfCrab(uint256 _tokenId) internal view returns (uint256 _gene) {
require(cryptantCrabStorage != address(0));
_gene = cryptantCrabStorage.readUint256(keccak256(abi.encodePacked(_tokenId, "gene")));
}
}
contract CryptantCrabPurchasable is CryptantCrabInformant {
using SafeMath for uint256;
event CrabHatched(address indexed owner, uint256 tokenId, uint256 gene, uint256 specialSkin, uint256 crabPrice, uint256 growthValue);
event CryptantFragmentsAdded(address indexed cryptantOwner, uint256 amount, uint256 newBalance);
event CryptantFragmentsRemoved(address indexed cryptantOwner, uint256 amount, uint256 newBalance);
event Refund(address indexed refundReceiver, uint256 reqAmt, uint256 paid, uint256 refundAmt);
constructor
(
address _genesisCrabAddress,
address _cryptantCrabTokenAddress,
address _cryptantCrabStorageAddress
)
public
CryptantCrabInformant
(
_genesisCrabAddress,
_cryptantCrabTokenAddress,
_cryptantCrabStorageAddress
) {
// constructor
}
function getCryptantFragments(address _sender) public view returns (uint256) {
return cryptantCrabStorage.readUint256(keccak256(abi.encodePacked(_sender, "cryptant")));
}
function createCrab(uint256 _customTokenId, uint256 _crabPrice, uint256 _customGene, uint256 _customSkin, uint256 _customHeart, bool _hasLegendary) external onlyOwner {
return _createCrab(false, _customTokenId, _crabPrice, _customGene, _customSkin, _customHeart, _hasLegendary);
}
function _addCryptantFragments(address _cryptantOwner, uint256 _amount) internal returns (uint256 _newBalance) {
_newBalance = getCryptantFragments(_cryptantOwner).add(_amount);
cryptantCrabStorage.updateUint256(keccak256(abi.encodePacked(_cryptantOwner, "cryptant")), _newBalance);
emit CryptantFragmentsAdded(_cryptantOwner, _amount, _newBalance);
}
function _removeCryptantFragments(address _cryptantOwner, uint256 _amount) internal returns (uint256 _newBalance) {
_newBalance = getCryptantFragments(_cryptantOwner).sub(_amount);
cryptantCrabStorage.updateUint256(keccak256(abi.encodePacked(_cryptantOwner, "cryptant")), _newBalance);
emit CryptantFragmentsRemoved(_cryptantOwner, _amount, _newBalance);
}
function _createCrab(bool _isPresale, uint256 _tokenId, uint256 _crabPrice, uint256 _customGene, uint256 _customSkin, uint256 _customHeart, bool _hasLegendary) internal {
uint256[] memory _values = new uint256[](4);
bytes32[] memory _keys = new bytes32[](4);
uint256 _gene;
uint256 _specialSkin;
uint256 _heartValue;
uint256 _growthValue;
if(_customGene == 0) {
(_gene, _specialSkin, _heartValue, _growthValue) = genesisCrab.generateCrabGene(_isPresale, _hasLegendary);
} else {
_gene = _customGene;
}
if(_customSkin != 0) {
_specialSkin = _customSkin;
}
if(_customHeart != 0) {
_heartValue = _customHeart;
} else if (_heartValue == 0) {
(_heartValue, _growthValue) = genesisCrab.generateCrabHeart();
}
cryptantCrabToken.mintToken(msg.sender, _tokenId, _specialSkin);
// Gene pair
_keys[0] = keccak256(abi.encodePacked(_tokenId, "gene"));
_values[0] = _gene;
// Level pair
_keys[1] = keccak256(abi.encodePacked(_tokenId, "level"));
_values[1] = 1;
// Heart Value pair
_keys[2] = keccak256(abi.encodePacked(_tokenId, "heartValue"));
_values[2] = _heartValue;
// Growth Value pair
_keys[3] = keccak256(abi.encodePacked(_tokenId, "growthValue"));
_values[3] = _growthValue;
require(cryptantCrabStorage.createUint256s(_keys, _values));
emit CrabHatched(msg.sender, _tokenId, _gene, _specialSkin, _crabPrice, _growthValue);
}
function _refundExceededValue(uint256 _senderValue, uint256 _requiredValue) internal {
uint256 _exceededValue = _senderValue.sub(_requiredValue);
if(_exceededValue > 0) {
msg.sender.transfer(_exceededValue);
emit Refund(msg.sender, _requiredValue, _senderValue, _exceededValue);
}
}
}
contract Withdrawable is Ownable {
address public withdrawer;
/**
* @dev Throws if called by any account other than the withdrawer.
*/
modifier onlyWithdrawer() {
require(msg.sender == withdrawer);
_;
}
function setWithdrawer(address _newWithdrawer) external onlyOwner {
withdrawer = _newWithdrawer;
}
/**
* @dev withdraw the specified amount of ether from contract.
* @param _amount the amount of ether to withdraw. Units in wei.
*/
function withdraw(uint256 _amount) external onlyWithdrawer returns(bool) {
require(_amount <= address(this).balance);
withdrawer.transfer(_amount);
return true;
}
}
contract Randomable {
// Generates a random number base on last block hash
function _generateRandom(bytes32 seed) view internal returns (bytes32) {
return keccak256(abi.encodePacked(blockhash(block.number-1), seed));
}
function _generateRandomNumber(bytes32 seed, uint256 max) view internal returns (uint256) {
return uint256(_generateRandom(seed)) % max;
}
}
contract CryptantCrabPresale is CryptantCrabPurchasable, HasNoEther, Withdrawable, Randomable {
event PresalePurchased(address indexed owner, uint256 amount, uint256 cryptant, uint256 refund);
uint256 constant public PRESALE_LIMIT = 5000;
/**
* @dev Currently is set to 17/11/2018 00:00:00
*/
uint256 public presaleEndTime = 1542412800;
/**
* @dev Initial presale price is 0.25 ether
*/
uint256 public currentPresalePrice = 250 finney;
/**
* @dev tracks the current token id, starts from 721
*/
uint256 public currentTokenId = 721;
/**
* @dev tracks the current giveaway token id, starts from 5102
*/
uint256 public giveawayTokenId = 5102;
constructor
(
address _genesisCrabAddress,
address _cryptantCrabTokenAddress,
address _cryptantCrabStorageAddress
)
public
CryptantCrabPurchasable
(
_genesisCrabAddress,
_cryptantCrabTokenAddress,
_cryptantCrabStorageAddress
) {
// constructor
}
function setCurrentTokenId(uint256 _newTokenId) external onlyOwner {
currentTokenId = _newTokenId;
}
function setPresaleEndtime(uint256 _newEndTime) external onlyOwner {
presaleEndTime = _newEndTime;
}
function getPresalePrice() public view returns (uint256) {
return currentPresalePrice;
}
function purchase(uint256 _amount) external payable {
require(genesisCrab != address(0));
require(cryptantCrabToken != address(0));
require(cryptantCrabStorage != address(0));
require(_amount > 0 && _amount <= 10);
require(isPresale());
require(PRESALE_LIMIT >= currentTokenId + _amount);
uint256 _value = msg.value;
uint256 _currentPresalePrice = getPresalePrice();
uint256 _totalRequiredAmount = _currentPresalePrice * _amount;
require(_value >= _totalRequiredAmount);
// Purchase 10 crabs will have 1 crab with legendary part
// Default value for _crabWithLegendaryPart is just a unreacable number
uint256 _crabWithLegendaryPart = 100;
if(_amount == 10) {
// decide which crab will have the legendary part
_crabWithLegendaryPart = _generateRandomNumber(bytes32(currentTokenId), 10);
}
for(uint256 i = 0 ; i < _amount ; i++) {
currentTokenId++;
_createCrab(true, currentTokenId, _currentPresalePrice, 0, 0, 0, _crabWithLegendaryPart == i);
}
// Presale crab will get free cryptant fragments
_addCryptantFragments(msg.sender, (i * 3000));
// Refund exceeded value
_refundExceededValue(_value, _totalRequiredAmount);
emit PresalePurchased(msg.sender, _amount, i * 3000, _value - _totalRequiredAmount);
}
function createCrab(uint256 _customTokenId, uint256 _crabPrice, uint256 _customGene, uint256 _customSkin, uint256 _customHeart, bool _hasLegendary) external onlyOwner {
return _createCrab(true, _customTokenId, _crabPrice, _customGene, _customSkin, _customHeart, _hasLegendary);
}
function generateGiveawayCrabs(uint256 _amount) external onlyOwner {
for(uint256 i = 0 ; i < _amount ; i++) {
_createCrab(false, giveawayTokenId++, 120 finney, 0, 0, 0, false);
}
}
function isPresale() internal view returns (bool) {
return now < presaleEndTime;
}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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nymous":false,"inputs":[{"indexed":true,"name":"cryptantOwner","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"newBalance","type":"uint256"}],"name":"CryptantFragmentsAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"cryptantOwner","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"newBalance","type":"uint256"}],"name":"CryptantFragmentsRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"refundReceiver","type":"address"},{"indexed":false,"name":"reqAmt","type":"uint256"},{"indexed":false,"name":"paid","type":"uint256"},{"indexed":false,"name":"refundAmt","type":"uint256"}],"name":"Refund","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"}],"name":"OwnershipRenounced","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"}]Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000003aeef44884383a170363d0053524712db80d4af00000000000000000000000002d00c17edbc2757ca33b76cc2465fa65b591a36700000000000000000000000030491d19a0a912a928c7e04cb8627e361d5cd434
-----Decoded View---------------
Arg [0] : _genesisCrabAddress (address): 0x3aEEf44884383A170363d0053524712dB80D4af0
Arg [1] : _cryptantCrabTokenAddress (address): 0x2d00c17EdBc2757Ca33b76cC2465Fa65B591A367
Arg [2] : _cryptantCrabStorageAddress (address): 0x30491d19a0A912a928c7E04CB8627E361d5Cd434
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000003aeef44884383a170363d0053524712db80d4af0
Arg [1] : 0000000000000000000000002d00c17edbc2757ca33b76cc2465fa65b591a367
Arg [2] : 00000000000000000000000030491d19a0a912a928c7e04cb8627e361d5cd434
Swarm Source
bzzr://9402982b42e1a1b857b05945b4e5a7dc5e8900789f969fbae7e799fb0748b339
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Multichain Portfolio | 30 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.