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pragma solidity >=0.4.21 <0.6.0; | |
/** | |
* @dev Utility library of inline functions on addresses. | |
* @notice Based on: | |
* https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Address.sol | |
* Requires EIP-1052. | |
*/ | |
library AddressUtils | |
{ | |
/** | |
* @dev Returns whether the target address is a contract. | |
* @param _addr Address to check. | |
* @return True if _addr is a contract, false if not. | |
*/ | |
function isContract( | |
address _addr | |
) | |
internal | |
view | |
returns (bool addressCheck) | |
{ | |
// This method relies in extcodesize, which returns 0 for contracts in | |
// construction, since the code is only stored at the end of the | |
// constructor execution. | |
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts | |
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned | |
// for accounts without code, i.e. `keccak256('')` | |
bytes32 codehash; | |
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; | |
assembly { codehash := extcodehash(_addr) } // solhint-disable-line | |
addressCheck = (codehash != 0x0 && codehash != accountHash); | |
} | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
import "./nf-token-metadata.sol"; | |
import "./ownable.sol"; | |
import "./Fynya_Token.sol"; | |
contract Asset is | |
NFTokenMetadata, | |
Ownable | |
{ | |
struct Certificate { | |
uint certificate_id; | |
string consignment_name; | |
string consignment_quantity; | |
string consignment_standard; | |
int assay_transaction_id; | |
int LCApproval_transaction_id; | |
int insurance_transaction_id; | |
int customs_transaction_id; | |
int shipping_transaction_id; | |
int paymentApprovedTransaction_id; | |
address consignment_owner; | |
address warehousePublicAddress; | |
} | |
mapping(uint => bool) isAssayed; | |
mapping(uint => bool) isLCApproved; | |
mapping(uint => bool) isInsured; | |
mapping(uint => bool) isCustomsCleared; | |
mapping(uint => bool) isShippingCleared; | |
mapping(uint => bool) isPaymentApproved; | |
uint[] CertificatesAssayedList; | |
uint[] CertificatesLCApprovedList; | |
uint[] CertificatesInsuredList; | |
uint[] CertificatesCutsomsClearedList; | |
uint[] CertificatesShippedList; | |
uint[] CertificatesPaymentApprovedList; | |
mapping(address => bool) isAssayingAuthority; | |
mapping(address => bool) isInsuringAuthority; | |
mapping(address => bool) isBank; | |
mapping(address => bool) isCustomsAuthority; | |
mapping(address => bool) isShippingAuthority; | |
mapping(address => bool) isWarehouse; | |
address[] AssayerList; | |
address[] BankList; | |
address[] InsurerList; | |
address[] CustomsList; | |
address[] ShipperList; | |
address[] WarehouseList; | |
Certificate[] public Certificates; | |
uint token_balance; | |
Fynya_Token _token = Fynya_Token(address(0x94A008C18020905a1E2c4fa81136528694a9834D)); | |
constructor() | |
public | |
{ | |
nftName = "Fynya Token"; | |
nftSymbol = "FYN"; | |
} | |
function addAssayer(address _newAssayer) public onlyOwner returns (bool) { | |
AssayerList.push(_newAssayer); | |
isAssayingAuthority[_newAssayer] = true; | |
return true; | |
} | |
function addBank(address _newBank) public onlyOwner returns (bool) { | |
BankList.push(_newBank); | |
isBank[_newBank] = true; | |
return true; | |
} | |
function addInsurer(address _newInsurer) public onlyOwner returns (bool) { | |
InsurerList.push(_newInsurer); | |
isInsuringAuthority[_newInsurer] = true; | |
return true; | |
} | |
function addCustoms (address _newCustoms) public onlyOwner returns (bool) { | |
CustomsList.push(_newCustoms); | |
isInsuringAuthority[_newCustoms] = true; | |
return true; | |
} | |
function addShipper(address _newShipper) public onlyOwner returns (bool) { | |
ShipperList.push(_newShipper); | |
isShippingAuthority[_newShipper] = true; | |
return true; | |
} | |
function addWarehouse(address _warehouse) public onlyOwner returns (bool) { | |
WarehouseList.push(_warehouse); | |
isWarehouse[_warehouse] = true; | |
return true; | |
} | |
// function mint(address _to ) external onlyOwner returns(uint) { | |
// uint _tokenId=Certificates.length; | |
// super._mint(_to, _tokenId); | |
// super._setTokenUri(_tokenId, ""); | |
// return(_tokenId); | |
// } | |
function fynyaTokenBalance(address _enquire) public view returns (uint balance) { | |
return(_token.fynyatokenbalance(_enquire)); | |
} | |
function fynyaTokenApprove(address _to, uint _value) public payable returns (bool success) { | |
return _token.approve(_to, _value); | |
} | |
function fynyaTokenTransfer(address _to, uint _value) public payable returns (bool success) { | |
return _token.transfer(_to, _value); | |
} | |
function findSender() public view returns (address sender) { | |
return _token.getMsgSender(); | |
} | |
function toAssay( | |
string calldata _consignment_name, | |
string calldata _consignment_quantity, | |
string calldata _consignment_standard, | |
int _assay_transaction_id, | |
address _consignment_owner, | |
address _warehousePublicAddress | |
) external OnlyAssayer returns(uint) { | |
Certificate memory newCertificate = Certificate({ | |
certificate_id: Certificates.length, | |
consignment_quantity: _consignment_quantity, | |
consignment_standard: _consignment_standard, | |
consignment_owner: _consignment_owner, | |
assay_transaction_id: _assay_transaction_id, | |
LCApproval_transaction_id: -1, | |
insurance_transaction_id: -1, | |
customs_transaction_id: -1, | |
shipping_transaction_id: -1, | |
paymentApprovedTransaction_id: -1, | |
warehousePublicAddress: _warehousePublicAddress, | |
consignment_name: _consignment_name | |
}); | |
super._mint(_consignment_owner, Certificates.length); | |
super._setTokenUri(Certificates.length, ""); | |
Certificates.push(newCertificate); | |
isAssayed[Certificates.length - 1] = true; | |
CertificatesAssayedList.push(Certificates.length - 1); | |
return(Certificates.length - 1); | |
} | |
function toInsure(uint _tokenId, int _insurance_transaction_id) external OnlyInsurer returns(uint) { | |
isInsured[_tokenId] = true; | |
Certificates[_tokenId].insurance_transaction_id = _insurance_transaction_id; | |
CertificatesInsuredList.push(_tokenId); | |
return(_tokenId); | |
} | |
function LCApprove(uint _tokenId, int _lc_approve_transaction_id) external OnlyBank returns(uint) { | |
isLCApproved[_tokenId] = true; | |
Certificates[_tokenId].LCApproval_transaction_id = _lc_approve_transaction_id; | |
CertificatesLCApprovedList.push(_tokenId); | |
return(_tokenId); | |
} | |
function toCustoms(uint _tokenId, int _customs_transaction_id) external OnlyCustoms returns(uint) { | |
isCustomsCleared[_tokenId] = true; | |
Certificates[_tokenId].customs_transaction_id = _customs_transaction_id; | |
CertificatesCutsomsClearedList.push(_tokenId); | |
return(_tokenId); | |
} | |
function toShipping(uint _tokenId, int _shipping_transaction_id) external OnlyShipper returns(uint) { | |
isShippingCleared[_tokenId] = true; | |
Certificates[_tokenId].shipping_transaction_id = _shipping_transaction_id; | |
CertificatesShippedList.push(_tokenId); | |
return(_tokenId); | |
} | |
function PaymentApprove(uint _tokenId, int _payment_approve_transaction_id) external OnlyBank returns(uint) { | |
isPaymentApproved[_tokenId] = true; | |
Certificates[_tokenId].paymentApprovedTransaction_id = _payment_approve_transaction_id; | |
CertificatesPaymentApprovedList.push(_tokenId); | |
return(_tokenId); | |
} | |
modifier OnlyAssayer { | |
require(isAssayingAuthority[msg.sender] == true); | |
_; | |
} | |
modifier OnlyInsurer { | |
require(isInsuringAuthority[msg.sender] == true); | |
_; | |
} | |
modifier OnlyCustoms { | |
require(isCustomsAuthority[msg.sender] == true); | |
_; | |
} | |
modifier OnlyShipper { | |
require(isShippingAuthority[msg.sender] == true); | |
_; | |
} | |
modifier OnlyBank { | |
require(isBank[msg.sender] == true); | |
_; | |
} | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
contract Fynya_Token { | |
string public name = "Fynya Gold June 2020 Token"; | |
string public symbol = "FYNJunGold2020"; | |
string public standard = "Fynya Gold June 2020 Token v0.1"; | |
string public strStartDate = "23-06-2020 12:00:00"; | |
string public strEndDate = "23-09-2020 12:00:00"; | |
string public TradingPeriod = "Monday to Friday"; | |
string public TradingUnit = "1 FYNJunGold2020 = 1 kg"; | |
uint256 public totalSupply; | |
uint256 public startDate = 1592913600; | |
uint256 public endDate = 1600862400; | |
event Transfer( | |
address indexed _from, | |
address indexed _to, | |
uint256 _value | |
); | |
event TransferFromApp( | |
address indexed _from, | |
address indexed _to, | |
uint256 _value, | |
uint256 _token | |
); | |
event Approval( | |
address indexed _owner, | |
address indexed _spender, | |
uint256 _value | |
); | |
mapping(address => uint256) public balanceOf; | |
mapping(address => mapping(address => uint256)) public allowance; | |
constructor (uint256 _initialSupply) public { | |
balanceOf[msg.sender] = _initialSupply; | |
totalSupply = _initialSupply; | |
} | |
function test() public view notExpired returns (uint) { | |
return now; | |
} | |
function transfer(address _to, uint256 _value) public notExpired returns (bool success) { | |
require(balanceOf[msg.sender] >= _value); | |
balanceOf[msg.sender] -= _value; | |
balanceOf[_to] += _value; | |
emit Transfer(msg.sender, _to, _value); | |
return true; | |
} | |
function _transfer(address _to, uint256 _value, uint _token) public notExpired returns (bool success) { | |
require(balanceOf[msg.sender] >= _value); | |
balanceOf[msg.sender] -= _value; | |
balanceOf[_to] += _value; | |
emit TransferFromApp(msg.sender, _to, _value, _token); | |
return true; | |
} | |
function approve(address _spender, uint256 _value) public notExpired returns (bool success) { | |
allowance[msg.sender][_spender] = _value; | |
emit Approval(msg.sender, _spender, _value); | |
return true; | |
} | |
function transferFrom(address _from, address _to, uint256 _value) public notExpired returns (bool success) { | |
require(_value <= balanceOf[_from]); | |
require(_value <= allowance[_from][msg.sender]); | |
balanceOf[_from] -= _value; | |
balanceOf[_to] += _value; | |
allowance[_from][msg.sender] -= _value; | |
emit Transfer(_from, _to, _value); | |
return true; | |
} | |
modifier notExpired { | |
require(now < endDate); | |
_; | |
} | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
/** | |
* @dev A standard for detecting smart contract interfaces. | |
* See: https://eips.ethereum.org/EIPS/eip-165. | |
*/ | |
interface ERC165 | |
{ | |
/** | |
* @dev Checks if the smart contract includes a specific interface. | |
* @notice This function uses less than 30,000 gas. | |
* @param _interfaceID The interface identifier, as specified in ERC-165. | |
* @return True if _interfaceID is supported, false otherwise. | |
*/ | |
function supportsInterface( | |
bytes4 _interfaceID | |
) | |
external | |
view | |
returns (bool); | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
/** | |
* @dev Optional enumeration extension for ERC-721 non-fungible token standard. | |
* See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md. | |
*/ | |
interface ERC721Enumerable | |
{ | |
/** | |
* @dev Returns a count of valid NFTs tracked by this contract, where each one of them has an | |
* assigned and queryable owner not equal to the zero address. | |
* @return Total supply of NFTs. | |
*/ | |
function totalSupply() | |
external | |
view | |
returns (uint256); | |
/** | |
* @dev Returns the token identifier for the `_index`th NFT. Sort order is not specified. | |
* @param _index A counter less than `totalSupply()`. | |
* @return Token id. | |
*/ | |
function tokenByIndex( | |
uint256 _index | |
) | |
external | |
view | |
returns (uint256); | |
/** | |
* @dev Returns the token identifier for the `_index`th NFT assigned to `_owner`. Sort order is | |
* not specified. It throws if `_index` >= `balanceOf(_owner)` or if `_owner` is the zero address, | |
* representing invalid NFTs. | |
* @param _owner An address where we are interested in NFTs owned by them. | |
* @param _index A counter less than `balanceOf(_owner)`. | |
* @return Token id. | |
*/ | |
function tokenOfOwnerByIndex( | |
address _owner, | |
uint256 _index | |
) | |
external | |
view | |
returns (uint256); | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
/** | |
* @dev Optional metadata extension for ERC-721 non-fungible token standard. | |
* See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md. | |
*/ | |
interface ERC721Metadata | |
{ | |
/** | |
* @dev Returns a descriptive name for a collection of NFTs in this contract. | |
* @return Representing name. | |
*/ | |
function name() | |
external | |
view | |
returns (string memory _name); | |
/** | |
* @dev Returns a abbreviated name for a collection of NFTs in this contract. | |
* @return Representing symbol. | |
*/ | |
function symbol() | |
external | |
view | |
returns (string memory _symbol); | |
/** | |
* @dev Returns a distinct Uniform Resource Identifier (URI) for a given asset. It Throws if | |
* `_tokenId` is not a valid NFT. URIs are defined in RFC3986. The URI may point to a JSON file | |
* that conforms to the "ERC721 Metadata JSON Schema". | |
* @return URI of _tokenId. | |
*/ | |
function tokenURI(uint256 _tokenId) | |
external | |
view | |
returns (string memory); | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
/** | |
* @dev ERC-721 interface for accepting safe transfers. | |
* See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md. | |
*/ | |
interface ERC721TokenReceiver | |
{ | |
/** | |
* @dev Handle the receipt of a NFT. The ERC721 smart contract calls this function on the | |
* recipient after a `transfer`. This function MAY throw to revert and reject the transfer. Return | |
* of other than the magic value MUST result in the transaction being reverted. | |
* Returns `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` unless throwing. | |
* @notice The contract address is always the message sender. A wallet/broker/auction application | |
* MUST implement the wallet interface if it will accept safe transfers. | |
* @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 Returns `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`. | |
*/ | |
function onERC721Received( | |
address _operator, | |
address _from, | |
uint256 _tokenId, | |
bytes calldata _data | |
) | |
external | |
returns(bytes4); | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
/** | |
* @dev ERC-721 non-fungible token standard. | |
* See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md. | |
*/ | |
interface ERC721 | |
{ | |
/** | |
* @dev Emits when ownership of any NFT changes by any mechanism. This event emits when NFTs are | |
* created (`from` == 0) and destroyed (`to` == 0). Exception: during contract creation, any | |
* number of NFTs may be created and assigned without emitting Transfer. At the time of any | |
* transfer, the approved address for that NFT (if any) is reset to none. | |
*/ | |
event Transfer( | |
address indexed _from, | |
address indexed _to, | |
uint256 indexed _tokenId | |
); | |
/** | |
* @dev This emits when the approved address for an NFT is changed or reaffirmed. The zero | |
* address indicates there is no approved address. When a Transfer event emits, this also | |
* indicates that the approved address for that NFT (if any) is reset to none. | |
*/ | |
event Approval( | |
address indexed _owner, | |
address indexed _approved, | |
uint256 indexed _tokenId | |
); | |
/** | |
* @dev This emits when an operator is enabled or disabled for an owner. The operator can manage | |
* all NFTs of the owner. | |
*/ | |
event ApprovalForAll( | |
address indexed _owner, | |
address indexed _operator, | |
bool _approved | |
); | |
/** | |
* @dev Transfers the ownership of an NFT from one address to another address. | |
* @notice Throws unless `msg.sender` is the current owner, an authorized operator, or the | |
* approved address for this NFT. Throws if `_from` is not the current owner. Throws if `_to` is | |
* the zero address. Throws if `_tokenId` is not a valid NFT. When transfer is complete, this | |
* function checks if `_to` is a smart contract (code size > 0). If so, it calls | |
* `onERC721Received` on `_to` and throws if the return value is not | |
* `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`. | |
* @param _from The current owner of the NFT. | |
* @param _to The new owner. | |
* @param _tokenId The NFT to transfer. | |
* @param _data Additional data with no specified format, sent in call to `_to`. | |
*/ | |
function safeTransferFrom( | |
address _from, | |
address _to, | |
uint256 _tokenId, | |
bytes calldata _data | |
) | |
external; | |
/** | |
* @dev Transfers the ownership of an NFT from one address to another address. | |
* @notice This works identically to the other function with an extra data parameter, except this | |
* function just sets data to "" | |
* @param _from The current owner of the NFT. | |
* @param _to The new owner. | |
* @param _tokenId The NFT to transfer. | |
*/ | |
function safeTransferFrom( | |
address _from, | |
address _to, | |
uint256 _tokenId | |
) | |
external; | |
/** | |
* @dev Throws unless `msg.sender` is the current owner, an authorized operator, or the approved | |
* address for this NFT. Throws if `_from` is not the current owner. Throws if `_to` is the zero | |
* address. Throws if `_tokenId` is not a valid NFT. | |
* @notice The caller is responsible to confirm that `_to` is capable of receiving NFTs or else | |
* they mayb be permanently lost. | |
* @param _from The current owner of the NFT. | |
* @param _to The new owner. | |
* @param _tokenId The NFT to transfer. | |
*/ | |
function transferFrom( | |
address _from, | |
address _to, | |
uint256 _tokenId | |
) | |
external; | |
/** | |
* @dev Set or reaffirm the approved address for an NFT. | |
* @notice The zero address indicates there is no approved address. Throws unless `msg.sender` is | |
* the current NFT owner, or an authorized operator of the current owner. | |
* @param _approved The new approved NFT controller. | |
* @param _tokenId The NFT to approve. | |
*/ | |
function approve( | |
address _approved, | |
uint256 _tokenId | |
) | |
external; | |
/** | |
* @dev Enables or disables approval for a third party ("operator") to manage all of | |
* `msg.sender`'s assets. It also emits the ApprovalForAll event. | |
* @notice The contract MUST allow multiple operators per owner. | |
* @param _operator Address to add to the set of authorized operators. | |
* @param _approved True if the operators is approved, false to revoke approval. | |
*/ | |
function setApprovalForAll( | |
address _operator, | |
bool _approved | |
) | |
external; | |
/** | |
* @dev Returns the number of NFTs owned by `_owner`. NFTs assigned to the zero address are | |
* considered invalid, and this function throws for queries about the zero address. | |
* @param _owner Address for whom to query the balance. | |
* @return Balance of _owner. | |
*/ | |
function balanceOf( | |
address _owner | |
) | |
external | |
view | |
returns (uint256); | |
/** | |
* @dev Returns the address of the owner of the NFT. NFTs assigned to zero address are considered | |
* invalid, and queries about them do throw. | |
* @param _tokenId The identifier for an NFT. | |
* @return Address of _tokenId owner. | |
*/ | |
function ownerOf( | |
uint256 _tokenId | |
) | |
external | |
view | |
returns (address); | |
/** | |
* @dev Get the approved address for a single NFT. | |
* @notice Throws if `_tokenId` is not a valid NFT. | |
* @param _tokenId The NFT to find the approved address for. | |
* @return Address that _tokenId is approved for. | |
*/ | |
function getApproved( | |
uint256 _tokenId | |
) | |
external | |
view | |
returns (address); | |
/** | |
* @dev Returns true if `_operator` is an approved operator for `_owner`, false otherwise. | |
* @param _owner The address that owns the NFTs. | |
* @param _operator The address that acts on behalf of the owner. | |
* @return True if approved for all, false otherwise. | |
*/ | |
function isApprovedForAll( | |
address _owner, | |
address _operator | |
) | |
external | |
view | |
returns (bool); | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
contract Fynya_Token { | |
string public name = "Fynya Token"; | |
string public symbol = "FYN"; | |
string public standard = "Fynya Token v1.0"; | |
uint256 public totalSupply; | |
event Transfer( | |
address indexed _from, | |
address indexed _to, | |
uint256 _value | |
); | |
event TransferFromApp( | |
address indexed _from, | |
address indexed _to, | |
uint256 _value, | |
uint256 _token | |
); | |
event TransferFuture( | |
address indexed _from, | |
address indexed _to, | |
uint256 _value, | |
uint256 token_code | |
); | |
event Approval( | |
address indexed _owner, | |
address indexed _spender, | |
uint256 _value | |
); | |
mapping(address => uint256) public balanceOf; | |
mapping(address => mapping(address => uint256)) public allowance; | |
constructor (uint256 _initialSupply) public { | |
balanceOf[msg.sender] = _initialSupply; | |
totalSupply = _initialSupply; | |
} | |
function fynyatokenbalance (address _enquire) public view returns(uint) { | |
return balanceOf[_enquire]; | |
} | |
function transfer(address _to, uint256 _value) public returns (bool success) { | |
require(balanceOf[msg.sender] >= _value); | |
balanceOf[msg.sender] -= _value; | |
balanceOf[_to] += _value; | |
emit Transfer(msg.sender, _to, _value); | |
return true; | |
} | |
function _transfer(address _to, uint256 _value, uint _token) public returns (bool success) { | |
require(balanceOf[msg.sender] >= _value); | |
balanceOf[msg.sender] -= _value; | |
balanceOf[_to] += _value; | |
emit TransferFromApp(msg.sender, _to, _value, _token); | |
return true; | |
} | |
function transfer_future(address _to, uint256 _value, uint256 token_code) public returns (bool success) { | |
require(balanceOf[msg.sender] >= _value); | |
balanceOf[msg.sender] -= _value; | |
balanceOf[_to] += _value; | |
emit TransferFuture(msg.sender, _to, _value, token_code); | |
return true; | |
} | |
function approve(address _spender, uint256 _value) public returns (bool success) { | |
allowance[msg.sender][_spender] = _value; | |
emit Approval(msg.sender, _spender, _value); | |
return true; | |
} | |
function getMsgSender() public view returns (address sender) { | |
return msg.sender; | |
} | |
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) { | |
require(_value <= balanceOf[_from]); | |
require(_value <= allowance[_from][msg.sender]); | |
balanceOf[_from] -= _value; | |
balanceOf[_to] += _value; | |
allowance[_from][msg.sender] -= _value; | |
emit Transfer(_from, _to, _value); | |
return true; | |
} | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
import "./nf-token.sol"; | |
import "./erc721-enumerable.sol"; | |
/** | |
* @dev Optional enumeration implementation for ERC-721 non-fungible token standard. | |
*/ | |
contract NFTokenEnumerable is | |
NFToken, | |
ERC721Enumerable | |
{ | |
/** | |
* @dev Array of all NFT IDs. | |
*/ | |
uint256[] internal tokens; | |
/** | |
* @dev Mapping from token ID to its index in global tokens array. | |
*/ | |
mapping(uint256 => uint256) internal idToIndex; | |
/** | |
* @dev Mapping from owner to list of owned NFT IDs. | |
*/ | |
mapping(address => uint256[]) internal ownerToIds; | |
/** | |
* @dev Mapping from NFT ID to its index in the owner tokens list. | |
*/ | |
mapping(uint256 => uint256) internal idToOwnerIndex; | |
/** | |
* @dev Contract constructor. | |
*/ | |
constructor() | |
public | |
{ | |
supportedInterfaces[0x780e9d63] = true; // ERC721Enumerable | |
} | |
/** | |
* @dev Returns the count of all existing NFTokens. | |
* @return Total supply of NFTs. | |
*/ | |
function totalSupply() | |
external | |
view | |
returns (uint256) | |
{ | |
return tokens.length; | |
} | |
/** | |
* @dev Returns NFT ID by its index. | |
* @param _index A counter less than `totalSupply()`. | |
* @return Token id. | |
*/ | |
function tokenByIndex( | |
uint256 _index | |
) | |
external | |
view | |
returns (uint256) | |
{ | |
require(_index < tokens.length); | |
return tokens[_index]; | |
} | |
/** | |
* @dev returns the n-th NFT ID from a list of owner's tokens. | |
* @param _owner Token owner's address. | |
* @param _index Index number representing n-th token in owner's list of tokens. | |
* @return Token id. | |
*/ | |
function tokenOfOwnerByIndex( | |
address _owner, | |
uint256 _index | |
) | |
external | |
view | |
returns (uint256) | |
{ | |
require(_index < ownerToIds[_owner].length); | |
return ownerToIds[_owner][_index]; | |
} | |
/** | |
* @dev Mints a new NFT. | |
* @notice This is an internal function which should be called from user-implemented external | |
* mint function. Its purpose is to show and properly initialize data structures when using this | |
* implementation. | |
* @param _to The address that will own the minted NFT. | |
* @param _tokenId of the NFT to be minted by the msg.sender. | |
*/ | |
function _mint( | |
address _to, | |
uint256 _tokenId | |
) | |
internal | |
{ | |
super._mint(_to, _tokenId); | |
uint256 length = tokens.push(_tokenId); | |
idToIndex[_tokenId] = length - 1; | |
} | |
/** | |
* @dev Burns a NFT. | |
* @notice This is an internal function which should be called from user-implemented external | |
* burn function. Its purpose is to show and properly initialize data structures when using this | |
* implementation. Also, note that this burn implementation allows the minter to re-mint a burned | |
* NFT. | |
* @param _tokenId ID of the NFT to be burned. | |
*/ | |
function _burn( | |
uint256 _tokenId | |
) | |
internal | |
{ | |
super._burn(_tokenId); | |
uint256 tokenIndex = idToIndex[_tokenId]; | |
uint256 lastTokenIndex = tokens.length - 1; | |
uint256 lastToken = tokens[lastTokenIndex]; | |
tokens[tokenIndex] = lastToken; | |
tokens.length--; | |
// This wastes gas if you are burning the last token but saves a little gas if you are not. | |
idToIndex[lastToken] = tokenIndex; | |
idToIndex[_tokenId] = 0; | |
} | |
/** | |
* @dev Removes a NFT from an address. | |
* @notice Use and override this function with caution. Wrong usage can have serious consequences. | |
* @param _from Address from wich we want to remove the NFT. | |
* @param _tokenId Which NFT we want to remove. | |
*/ | |
function _removeNFToken( | |
address _from, | |
uint256 _tokenId | |
) | |
internal | |
{ | |
require(idToOwner[_tokenId] == _from); | |
delete idToOwner[_tokenId]; | |
uint256 tokenToRemoveIndex = idToOwnerIndex[_tokenId]; | |
uint256 lastTokenIndex = ownerToIds[_from].length - 1; | |
if (lastTokenIndex != tokenToRemoveIndex) | |
{ | |
uint256 lastToken = ownerToIds[_from][lastTokenIndex]; | |
ownerToIds[_from][tokenToRemoveIndex] = lastToken; | |
idToOwnerIndex[lastToken] = tokenToRemoveIndex; | |
} | |
ownerToIds[_from].length--; | |
} | |
/** | |
* @dev Assignes a new NFT to an address. | |
* @notice Use and override this function with caution. Wrong usage can have serious consequences. | |
* @param _to Address to wich we want to add the NFT. | |
* @param _tokenId Which NFT we want to add. | |
*/ | |
function _addNFToken( | |
address _to, | |
uint256 _tokenId | |
) | |
internal | |
{ | |
require(idToOwner[_tokenId] == address(0)); | |
idToOwner[_tokenId] = _to; | |
uint256 length = ownerToIds[_to].push(_tokenId); | |
idToOwnerIndex[_tokenId] = length - 1; | |
} | |
/** | |
* @dev Helper function that gets NFT count of owner. This is needed for overriding in enumerable | |
* extension to remove double storage(gas optimization) of owner nft count. | |
* @param _owner Address for whom to query the count. | |
* @return Number of _owner NFTs. | |
*/ | |
function _getOwnerNFTCount( | |
address _owner | |
) | |
internal | |
view | |
returns (uint256) | |
{ | |
return ownerToIds[_owner].length; | |
} | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
import "./nf-token.sol"; | |
import "./erc721-metadata.sol"; | |
/** | |
* @dev Optional metadata implementation for ERC-721 non-fungible token standard. | |
*/ | |
contract NFTokenMetadata is | |
NFToken, | |
ERC721Metadata | |
{ | |
/** | |
* @dev A descriptive name for a collection of NFTs. | |
*/ | |
string internal nftName; | |
/** | |
* @dev An abbreviated name for NFTokens. | |
*/ | |
string internal nftSymbol; | |
/** | |
* @dev Mapping from NFT ID to metadata uri. | |
*/ | |
mapping (uint256 => string) internal idToUri; | |
/** | |
* @dev Contract constructor. | |
* @notice When implementing this contract don't forget to set nftName and nftSymbol. | |
*/ | |
constructor() | |
public | |
{ | |
supportedInterfaces[0x5b5e139f] = true; // ERC721Metadata | |
} | |
/** | |
* @dev Returns a descriptive name for a collection of NFTokens. | |
* @return Representing name. | |
*/ | |
function name() | |
external | |
view | |
returns (string memory _name) | |
{ | |
_name = nftName; | |
} | |
/** | |
* @dev Returns an abbreviated name for NFTokens. | |
* @return Representing symbol. | |
*/ | |
function symbol() | |
external | |
view | |
returns (string memory _symbol) | |
{ | |
_symbol = nftSymbol; | |
} | |
/** | |
* @dev A distinct URI (RFC 3986) for a given NFT. | |
* @param _tokenId Id for which we want uri. | |
* @return URI of _tokenId. | |
*/ | |
function tokenURI( | |
uint256 _tokenId | |
) | |
external | |
view | |
validNFToken(_tokenId) | |
returns (string memory) | |
{ | |
return idToUri[_tokenId]; | |
} | |
/** | |
* @dev Burns a NFT. | |
* @notice This is an internal function which should be called from user-implemented external | |
* burn function. Its purpose is to show and properly initialize data structures when using this | |
* implementation. Also, note that this burn implementation allows the minter to re-mint a burned | |
* NFT. | |
* @param _tokenId ID of the NFT to be burned. | |
*/ | |
function _burn( | |
uint256 _tokenId | |
) | |
internal | |
{ | |
super._burn(_tokenId); | |
if (bytes(idToUri[_tokenId]).length != 0) | |
{ | |
delete idToUri[_tokenId]; | |
} | |
} | |
/** | |
* @dev Set a distinct URI (RFC 3986) for a given NFT ID. | |
* @notice This is an internal function which should be called from user-implemented external | |
* function. Its purpose is to show and properly initialize data structures when using this | |
* implementation. | |
* @param _tokenId Id for which we want uri. | |
* @param _uri String representing RFC 3986 URI. | |
*/ | |
function _setTokenUri( | |
uint256 _tokenId, | |
string memory _uri | |
) | |
internal | |
validNFToken(_tokenId) | |
{ | |
idToUri[_tokenId] = _uri; | |
} | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
import "./erc721.sol"; | |
import "./erc721-token-receiver.sol"; | |
import "./safe-math.sol"; | |
import "./supports-interface.sol"; | |
import "./address-utils.sol"; | |
/** | |
* @dev Implementation of ERC-721 non-fungible token standard. | |
*/ | |
contract NFToken is | |
ERC721, | |
SupportsInterface | |
{ | |
using SafeMath for uint256; | |
using AddressUtils for address; | |
/** | |
* @dev Magic value of a smart contract that can recieve NFT. | |
* Equal to: bytes4(keccak256("onERC721Received(address,address,uint256,bytes)")). | |
*/ | |
bytes4 internal constant MAGIC_ON_ERC721_RECEIVED = 0x150b7a02; | |
/** | |
* @dev A mapping from NFT ID to the address that owns it. | |
*/ | |
mapping (uint256 => address) internal idToOwner; | |
/** | |
* @dev Mapping from NFT ID to approved address. | |
*/ | |
mapping (uint256 => address) internal idToApproval; | |
/** | |
* @dev Mapping from owner address to count of his tokens. | |
*/ | |
mapping (address => uint256) private ownerToNFTokenCount; | |
/** | |
* @dev Mapping from owner address to mapping of operator addresses. | |
*/ | |
mapping (address => mapping (address => bool)) internal ownerToOperators; | |
/** | |
* @dev Emits when ownership of any NFT changes by any mechanism. This event emits when NFTs are | |
* created (`from` == 0) and destroyed (`to` == 0). Exception: during contract creation, any | |
* number of NFTs may be created and assigned without emitting Transfer. At the time of any | |
* transfer, the approved address for that NFT (if any) is reset to none. | |
* @param _from Sender of NFT (if address is zero address it indicates token creation). | |
* @param _to Receiver of NFT (if address is zero address it indicates token destruction). | |
* @param _tokenId The NFT that got transfered. | |
*/ | |
event Transfer( | |
address indexed _from, | |
address indexed _to, | |
uint256 indexed _tokenId | |
); | |
/** | |
* @dev This emits when the approved address for an NFT is changed or reaffirmed. The zero | |
* address indicates there is no approved address. When a Transfer event emits, this also | |
* indicates that the approved address for that NFT (if any) is reset to none. | |
* @param _owner Owner of NFT. | |
* @param _approved Address that we are approving. | |
* @param _tokenId NFT which we are approving. | |
*/ | |
event Approval( | |
address indexed _owner, | |
address indexed _approved, | |
uint256 indexed _tokenId | |
); | |
/** | |
* @dev This emits when an operator is enabled or disabled for an owner. The operator can manage | |
* all NFTs of the owner. | |
* @param _owner Owner of NFT. | |
* @param _operator Address to which we are setting operator rights. | |
* @param _approved Status of operator rights(true if operator rights are given and false if | |
* revoked). | |
*/ | |
event ApprovalForAll( | |
address indexed _owner, | |
address indexed _operator, | |
bool _approved | |
); | |
/** | |
* @dev Guarantees that the msg.sender is an owner or operator of the given NFT. | |
* @param _tokenId ID of the NFT to validate. | |
*/ | |
modifier canOperate( | |
uint256 _tokenId | |
) | |
{ | |
address tokenOwner = idToOwner[_tokenId]; | |
require(tokenOwner == msg.sender || ownerToOperators[tokenOwner][msg.sender]); | |
_; | |
} | |
/** | |
* @dev Guarantees that the msg.sender is allowed to transfer NFT. | |
* @param _tokenId ID of the NFT to transfer. | |
*/ | |
modifier canTransfer( | |
uint256 _tokenId | |
) | |
{ | |
address tokenOwner = idToOwner[_tokenId]; | |
require( | |
tokenOwner == msg.sender | |
|| idToApproval[_tokenId] == msg.sender | |
|| ownerToOperators[tokenOwner][msg.sender] | |
); | |
_; | |
} | |
/** | |
* @dev Guarantees that _tokenId is a valid Token. | |
* @param _tokenId ID of the NFT to validate. | |
*/ | |
modifier validNFToken( | |
uint256 _tokenId | |
) | |
{ | |
require(idToOwner[_tokenId] != address(0)); | |
_; | |
} | |
/** | |
* @dev Contract constructor. | |
*/ | |
constructor() | |
public | |
{ | |
supportedInterfaces[0x80ac58cd] = true; // ERC721 | |
} | |
/** | |
* @dev Transfers the ownership of an NFT from one address to another address. This function can | |
* be changed to payable. | |
* @notice Throws unless `msg.sender` is the current owner, an authorized operator, or the | |
* approved address for this NFT. Throws if `_from` is not the current owner. Throws if `_to` is | |
* the zero address. Throws if `_tokenId` is not a valid NFT. When transfer is complete, this | |
* function checks if `_to` is a smart contract (code size > 0). If so, it calls | |
* `onERC721Received` on `_to` and throws if the return value is not | |
* `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`. | |
* @param _from The current owner of the NFT. | |
* @param _to The new owner. | |
* @param _tokenId The NFT to transfer. | |
* @param _data Additional data with no specified format, sent in call to `_to`. | |
*/ | |
function safeTransferFrom( | |
address _from, | |
address _to, | |
uint256 _tokenId, | |
bytes calldata _data | |
) | |
external | |
{ | |
_safeTransferFrom(_from, _to, _tokenId, _data); | |
} | |
/** | |
* @dev Transfers the ownership of an NFT from one address to another address. This function can | |
* be changed to payable. | |
* @notice This works identically to the other function with an extra data parameter, except this | |
* function just sets data to "" | |
* @param _from The current owner of the NFT. | |
* @param _to The new owner. | |
* @param _tokenId The NFT to transfer. | |
*/ | |
function safeTransferFrom( | |
address _from, | |
address _to, | |
uint256 _tokenId | |
) | |
external | |
{ | |
_safeTransferFrom(_from, _to, _tokenId, ""); | |
} | |
/** | |
* @dev Throws unless `msg.sender` is the current owner, an authorized operator, or the approved | |
* address for this NFT. Throws if `_from` is not the current owner. Throws if `_to` is the zero | |
* address. Throws if `_tokenId` is not a valid NFT. This function can be changed to payable. | |
* @notice The caller is responsible to confirm that `_to` is capable of receiving NFTs or else | |
* they maybe be permanently lost. | |
* @param _from The current owner of the NFT. | |
* @param _to The new owner. | |
* @param _tokenId The NFT to transfer. | |
*/ | |
function transferFrom( | |
address _from, | |
address _to, | |
uint256 _tokenId | |
) | |
external | |
canTransfer(_tokenId) | |
validNFToken(_tokenId) | |
{ | |
address tokenOwner = idToOwner[_tokenId]; | |
require(tokenOwner == _from); | |
require(_to != address(0)); | |
_transfer(_to, _tokenId); | |
} | |
/** | |
* @dev Set or reaffirm the approved address for an NFT. This function can be changed to payable. | |
* @notice The zero address indicates there is no approved address. Throws unless `msg.sender` is | |
* the current NFT owner, or an authorized operator of the current owner. | |
* @param _approved Address to be approved for the given NFT ID. | |
* @param _tokenId ID of the token to be approved. | |
*/ | |
function approve( | |
address _approved, | |
uint256 _tokenId | |
) | |
external | |
canOperate(_tokenId) | |
validNFToken(_tokenId) | |
{ | |
address tokenOwner = idToOwner[_tokenId]; | |
require(_approved != tokenOwner); | |
idToApproval[_tokenId] = _approved; | |
emit Approval(tokenOwner, _approved, _tokenId); | |
} | |
/** | |
* @dev Enables or disables approval for a third party ("operator") to manage all of | |
* `msg.sender`'s assets. It also emits the ApprovalForAll event. | |
* @notice This works even if sender doesn't own any tokens at the time. | |
* @param _operator Address to add to the set of authorized operators. | |
* @param _approved True if the operators is approved, false to revoke approval. | |
*/ | |
function setApprovalForAll( | |
address _operator, | |
bool _approved | |
) | |
external | |
{ | |
ownerToOperators[msg.sender][_operator] = _approved; | |
emit ApprovalForAll(msg.sender, _operator, _approved); | |
} | |
/** | |
* @dev Returns the number of NFTs owned by `_owner`. NFTs assigned to the zero address are | |
* considered invalid, and this function throws for queries about the zero address. | |
* @param _owner Address for whom to query the balance. | |
* @return Balance of _owner. | |
*/ | |
function balanceOf( | |
address _owner | |
) | |
external | |
view | |
returns (uint256) | |
{ | |
require(_owner != address(0)); | |
return _getOwnerNFTCount(_owner); | |
} | |
/** | |
* @dev Returns the address of the owner of the NFT. NFTs assigned to zero address are considered | |
* invalid, and queries about them do throw. | |
* @param _tokenId The identifier for an NFT. | |
* @return Address of _tokenId owner. | |
*/ | |
function ownerOf( | |
uint256 _tokenId | |
) | |
external | |
view | |
returns (address _owner) | |
{ | |
_owner = idToOwner[_tokenId]; | |
require(_owner != address(0)); | |
} | |
/** | |
* @dev Get the approved address for a single NFT. | |
* @notice Throws if `_tokenId` is not a valid NFT. | |
* @param _tokenId ID of the NFT to query the approval of. | |
* @return Address that _tokenId is approved for. | |
*/ | |
function getApproved( | |
uint256 _tokenId | |
) | |
external | |
view | |
validNFToken(_tokenId) | |
returns (address) | |
{ | |
return idToApproval[_tokenId]; | |
} | |
/** | |
* @dev Checks if `_operator` is an approved operator for `_owner`. | |
* @param _owner The address that owns the NFTs. | |
* @param _operator The address that acts on behalf of the owner. | |
* @return True if approved for all, false otherwise. | |
*/ | |
function isApprovedForAll( | |
address _owner, | |
address _operator | |
) | |
external | |
view | |
returns (bool) | |
{ | |
return ownerToOperators[_owner][_operator]; | |
} | |
/** | |
* @dev Actually preforms the transfer. | |
* @notice Does NO checks. | |
* @param _to Address of a new owner. | |
* @param _tokenId The NFT that is being transferred. | |
*/ | |
function _transfer( | |
address _to, | |
uint256 _tokenId | |
) | |
internal | |
{ | |
address from = idToOwner[_tokenId]; | |
_clearApproval(_tokenId); | |
_removeNFToken(from, _tokenId); | |
_addNFToken(_to, _tokenId); | |
emit Transfer(from, _to, _tokenId); | |
} | |
/** | |
* @dev Mints a new NFT. | |
* @notice This is an internal function which should be called from user-implemented external | |
* mint function. Its purpose is to show and properly initialize data structures when using this | |
* implementation. | |
* @param _to The address that will own the minted NFT. | |
* @param _tokenId of the NFT to be minted by the msg.sender. | |
*/ | |
function _mint( | |
address _to, | |
uint256 _tokenId | |
) | |
internal | |
{ | |
require(_to != address(0)); | |
require(idToOwner[_tokenId] == address(0)); | |
_addNFToken(_to, _tokenId); | |
emit Transfer(address(0), _to, _tokenId); | |
} | |
/** | |
* @dev Burns a NFT. | |
* @notice This is an internal function which should be called from user-implemented external burn | |
* function. Its purpose is to show and properly initialize data structures when using this | |
* implementation. Also, note that this burn implementation allows the minter to re-mint a burned | |
* NFT. | |
* @param _tokenId ID of the NFT to be burned. | |
*/ | |
function _burn( | |
uint256 _tokenId | |
) | |
internal | |
validNFToken(_tokenId) | |
{ | |
address tokenOwner = idToOwner[_tokenId]; | |
_clearApproval(_tokenId); | |
_removeNFToken(tokenOwner, _tokenId); | |
emit Transfer(tokenOwner, address(0), _tokenId); | |
} | |
/** | |
* @dev Removes a NFT from owner. | |
* @notice Use and override this function with caution. Wrong usage can have serious consequences. | |
* @param _from Address from wich we want to remove the NFT. | |
* @param _tokenId Which NFT we want to remove. | |
*/ | |
function _removeNFToken( | |
address _from, | |
uint256 _tokenId | |
) | |
internal | |
{ | |
require(idToOwner[_tokenId] == _from); | |
ownerToNFTokenCount[_from] = ownerToNFTokenCount[_from] - 1; | |
delete idToOwner[_tokenId]; | |
} | |
/** | |
* @dev Assignes a new NFT to owner. | |
* @notice Use and override this function with caution. Wrong usage can have serious consequences. | |
* @param _to Address to wich we want to add the NFT. | |
* @param _tokenId Which NFT we want to add. | |
*/ | |
function _addNFToken( | |
address _to, | |
uint256 _tokenId | |
) | |
internal | |
{ | |
require(idToOwner[_tokenId] == address(0)); | |
idToOwner[_tokenId] = _to; | |
ownerToNFTokenCount[_to] = ownerToNFTokenCount[_to].add(1); | |
} | |
/** | |
* @dev Helper function that gets NFT count of owner. This is needed for overriding in enumerable | |
* extension to remove double storage (gas optimization) of owner nft count. | |
* @param _owner Address for whom to query the count. | |
* @return Number of _owner NFTs. | |
*/ | |
function _getOwnerNFTCount( | |
address _owner | |
) | |
internal | |
view | |
returns (uint256) | |
{ | |
return ownerToNFTokenCount[_owner]; | |
} | |
/** | |
* @dev Actually perform the safeTransferFrom. | |
* @param _from The current owner of the NFT. | |
* @param _to The new owner. | |
* @param _tokenId The NFT to transfer. | |
* @param _data Additional data with no specified format, sent in call to `_to`. | |
*/ | |
function _safeTransferFrom( | |
address _from, | |
address _to, | |
uint256 _tokenId, | |
bytes memory _data | |
) | |
private | |
canTransfer(_tokenId) | |
validNFToken(_tokenId) | |
{ | |
address tokenOwner = idToOwner[_tokenId]; | |
require(tokenOwner == _from); | |
require(_to != address(0)); | |
_transfer(_to, _tokenId); | |
if (_to.isContract()) | |
{ | |
bytes4 retval = ERC721TokenReceiver(_to).onERC721Received(msg.sender, _from, _tokenId, _data); | |
require(retval == MAGIC_ON_ERC721_RECEIVED); | |
} | |
} | |
/** | |
* @dev Clears the current approval of a given NFT ID. | |
* @param _tokenId ID of the NFT to be transferred. | |
*/ | |
function _clearApproval( | |
uint256 _tokenId | |
) | |
private | |
{ | |
if (idToApproval[_tokenId] != address(0)) | |
{ | |
delete idToApproval[_tokenId]; | |
} | |
} | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
/** | |
* @dev The contract has an owner address, and provides basic authorization control whitch | |
* simplifies the implementation of user permissions. This contract is based on the source code at: | |
* https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/contracts/ownership/Ownable.sol | |
*/ | |
contract Ownable | |
{ | |
/** | |
* @dev Error constants. | |
*/ | |
string public constant NOT_OWNER = "018001"; | |
string public constant ZERO_ADDRESS = "018002"; | |
/** | |
* @dev Current owner address. | |
*/ | |
address public owner; | |
/** | |
* @dev An event which is triggered when the owner is changed. | |
* @param previousOwner The address of the previous owner. | |
* @param newOwner The address of the new owner. | |
*/ | |
event OwnershipTransferred( | |
address indexed previousOwner, | |
address indexed newOwner | |
); | |
/** | |
* @dev The 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, NOT_OWNER); | |
_; | |
} | |
/** | |
* @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 | |
{ | |
require(_newOwner != address(0), ZERO_ADDRESS); | |
emit OwnershipTransferred(owner, _newOwner); | |
owner = _newOwner; | |
} | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
/** | |
* @dev Math operations with safety checks that throw on error. This contract is based on the | |
* source code at: | |
* https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/contracts/math/SafeMath.sol. | |
*/ | |
library SafeMath | |
{ | |
/** | |
* @dev Multiplies two numbers, reverts on overflow. | |
* @param _factor1 Factor number. | |
* @param _factor2 Factor number. | |
* @return The product of the two factors. | |
*/ | |
function mul( | |
uint256 _factor1, | |
uint256 _factor2 | |
) | |
internal | |
pure | |
returns (uint256 product) | |
{ | |
// 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 (_factor1 == 0) | |
{ | |
return 0; | |
} | |
product = _factor1 * _factor2; | |
require(product / _factor1 == _factor2); | |
} | |
/** | |
* @dev Integer division of two numbers, truncating the quotient, reverts on division by zero. | |
* @param _dividend Dividend number. | |
* @param _divisor Divisor number. | |
* @return The quotient. | |
*/ | |
function div( | |
uint256 _dividend, | |
uint256 _divisor | |
) | |
internal | |
pure | |
returns (uint256 quotient) | |
{ | |
// Solidity automatically asserts when dividing by 0, using all gas. | |
require(_divisor > 0); | |
quotient = _dividend / _divisor; | |
// assert(_dividend == _divisor * quotient + _dividend % _divisor); // There is no case in which this doesn't hold. | |
} | |
/** | |
* @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend). | |
* @param _minuend Minuend number. | |
* @param _subtrahend Subtrahend number. | |
* @return Difference. | |
*/ | |
function sub( | |
uint256 _minuend, | |
uint256 _subtrahend | |
) | |
internal | |
pure | |
returns (uint256 difference) | |
{ | |
require(_subtrahend <= _minuend); | |
difference = _minuend - _subtrahend; | |
} | |
/** | |
* @dev Adds two numbers, reverts on overflow. | |
* @param _addend1 Number. | |
* @param _addend2 Number. | |
* @return Sum. | |
*/ | |
function add( | |
uint256 _addend1, | |
uint256 _addend2 | |
) | |
internal | |
pure | |
returns (uint256 sum) | |
{ | |
sum = _addend1 + _addend2; | |
require(sum >= _addend1); | |
} | |
/** | |
* @dev Divides two numbers and returns the remainder (unsigned integer modulo), reverts when | |
* dividing by zero. | |
* @param _dividend Number. | |
* @param _divisor Number. | |
* @return Remainder. | |
*/ | |
function mod( | |
uint256 _dividend, | |
uint256 _divisor | |
) | |
internal | |
pure | |
returns (uint256 remainder) | |
{ | |
require(_divisor != 0); | |
remainder = _dividend % _divisor; | |
} | |
} |
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pragma solidity >=0.4.21 <0.6.0; | |
import "./erc165.sol"; | |
/** | |
* @dev Implementation of standard for detect smart contract interfaces. | |
*/ | |
contract SupportsInterface is | |
ERC165 | |
{ | |
/** | |
* @dev Mapping of supported intefraces. | |
* @notice You must not set element 0xffffffff to true. | |
*/ | |
mapping(bytes4 => bool) internal supportedInterfaces; | |
/** | |
* @dev Contract constructor. | |
*/ | |
constructor() | |
public | |
{ | |
supportedInterfaces[0x01ffc9a7] = true; // ERC165 | |
} | |
/** | |
* @dev Function to check which interfaces are suported by this contract. | |
* @param _interfaceID Id of the interface. | |
* @return True if _interfaceID is supported, false otherwise. | |
*/ | |
function supportsInterface( | |
bytes4 _interfaceID | |
) | |
external | |
view | |
returns (bool) | |
{ | |
return supportedInterfaces[_interfaceID]; | |
} | |
} |
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