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// File: contracts/introspection/IKIP13.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @dev Interface of the KIP-13 standard, as defined in the | |
* [KIP-13](http://kips.klaytn.com/KIPs/kip-13-interface_query_standard). | |
* | |
* Implementers can declare support of contract interfaces, which can then be | |
* queried by others. | |
* | |
* For an implementation, see `KIP13`. | |
*/ | |
interface IKIP13 { | |
/** | |
* @dev Returns true if this contract implements the interface defined by | |
* `interfaceId`. See the corresponding | |
* [KIP-13 section](http://kips.klaytn.com/KIPs/kip-13-interface_query_standard#how-interface-identifiers-are-defined) | |
* to learn more about how these ids are created. | |
* | |
* This function call must use less than 30 000 gas. | |
*/ | |
function supportsInterface(bytes4 interfaceId) external view returns (bool); | |
} | |
// File: contracts/token/KIP17/IKIP17.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @dev Required interface of an KIP17 compliant contract. | |
*/ | |
contract IKIP17 is IKIP13 { | |
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 | |
); | |
/** | |
* @dev Returns the number of NFTs in `owner`'s account. | |
*/ | |
function balanceOf(address owner) public view returns (uint256 balance); | |
/** | |
* @dev Returns the owner of the NFT specified by `tokenId`. | |
*/ | |
function ownerOf(uint256 tokenId) public view returns (address owner); | |
/** | |
* @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to | |
* another (`to`). | |
* | |
* Requirements: | |
* - `from`, `to` cannot be zero. | |
* - `tokenId` must be owned by `from`. | |
* - If the caller is not `from`, it must be have been allowed to move this | |
* NFT by either `approve` or `setApproveForAll`. | |
*/ | |
function safeTransferFrom( | |
address from, | |
address to, | |
uint256 tokenId | |
) public; | |
/** | |
* @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to | |
* another (`to`). | |
* | |
* Requirements: | |
* - If the caller is not `from`, it must be approved to move this NFT by | |
* either `approve` or `setApproveForAll`. | |
*/ | |
function transferFrom( | |
address from, | |
address to, | |
uint256 tokenId | |
) public; | |
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 safeTransferFrom( | |
address from, | |
address to, | |
uint256 tokenId, | |
bytes memory data | |
) public; | |
} | |
// File: contracts/token/KIP17/IERC721Receiver.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title ERC721 token receiver interface | |
* @dev Interface for any contract that wants to support safeTransfers | |
* from ERC721 asset contracts. | |
*/ | |
contract IERC721Receiver { | |
/** | |
* @notice Handle the receipt of an NFT | |
* @dev The ERC721 smart contract calls this function on the recipient | |
* after a `safeTransfer`. This function MUST return the function selector, | |
* otherwise the caller will revert the transaction. The selector to be | |
* returned can be obtained as `this.onERC721Received.selector`. This | |
* function MAY throw to revert and reject the transfer. | |
* Note: the ERC721 contract address is always the message sender. | |
* @param operator The address which called `safeTransferFrom` function | |
* @param from The address which previously owned the token | |
* @param tokenId The NFT identifier which is being transferred | |
* @param data Additional data with no specified format | |
* @return bytes4 `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` | |
*/ | |
function onERC721Received( | |
address operator, | |
address from, | |
uint256 tokenId, | |
bytes memory data | |
) public returns (bytes4); | |
} | |
// File: contracts/token/KIP17/IKIP17Receiver.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title KIP17 token receiver interface | |
* @dev Interface for any contract that wants to support safeTransfers | |
* from KIP17 asset contracts. | |
* @dev see http://kips.klaytn.com/KIPs/kip-17-non_fungible_token | |
*/ | |
contract IKIP17Receiver { | |
/** | |
* @notice Handle the receipt of an NFT | |
* @dev The KIP17 smart contract calls this function on the recipient | |
* after a `safeTransfer`. This function MUST return the function selector, | |
* otherwise the caller will revert the transaction. The selector to be | |
* returned can be obtained as `this.onKIP17Received.selector`. This | |
* function MAY throw to revert and reject the transfer. | |
* Note: the KIP17 contract address is always the message sender. | |
* @param operator The address which called `safeTransferFrom` function | |
* @param from The address which previously owned the token | |
* @param tokenId The NFT identifier which is being transferred | |
* @param data Additional data with no specified format | |
* @return bytes4 `bytes4(keccak256("onKIP17Received(address,address,uint256,bytes)"))` | |
*/ | |
function onKIP17Received( | |
address operator, | |
address from, | |
uint256 tokenId, | |
bytes memory data | |
) public returns (bytes4); | |
} | |
// File: contracts/math/SafeMath.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @dev Wrappers over Solidity's arithmetic operations with added overflow | |
* checks. | |
* | |
* Arithmetic operations in Solidity wrap on overflow. This can easily result | |
* in bugs, because programmers usually assume that an overflow raises an | |
* error, which is the standard behavior in high level programming languages. | |
* `SafeMath` restores this intuition by reverting the transaction when an | |
* operation overflows. | |
* | |
* Using this library instead of the unchecked operations eliminates an entire | |
* class of bugs, so it's recommended to use it always. | |
*/ | |
library SafeMath { | |
/** | |
* @dev Returns the addition of two unsigned integers, reverting on | |
* overflow. | |
* | |
* Counterpart to Solidity's `+` operator. | |
* | |
* Requirements: | |
* - Addition cannot overflow. | |
*/ | |
function add(uint256 a, uint256 b) internal pure returns (uint256) { | |
uint256 c = a + b; | |
require(c >= a, "SafeMath: addition overflow"); | |
return c; | |
} | |
/** | |
* @dev Returns the subtraction of two unsigned integers, reverting on | |
* overflow (when the result is negative). | |
* | |
* Counterpart to Solidity's `-` operator. | |
* | |
* Requirements: | |
* - Subtraction cannot overflow. | |
*/ | |
function sub(uint256 a, uint256 b) internal pure returns (uint256) { | |
return sub(a, b, "SafeMath: subtraction overflow"); | |
} | |
/** | |
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on | |
* overflow (when the result is negative). | |
* | |
* Counterpart to Solidity's `-` operator. | |
* | |
* Requirements: | |
* - Subtraction cannot overflow. | |
* | |
* _Available since v2.4.0._ | |
*/ | |
function sub( | |
uint256 a, | |
uint256 b, | |
string memory errorMessage | |
) internal pure returns (uint256) { | |
require(b <= a, errorMessage); | |
uint256 c = a - b; | |
return c; | |
} | |
/** | |
* @dev Returns the multiplication of two unsigned integers, reverting on | |
* overflow. | |
* | |
* Counterpart to Solidity's `*` operator. | |
* | |
* Requirements: | |
* - Multiplication cannot overflow. | |
*/ | |
function mul(uint256 a, uint256 b) internal pure returns (uint256) { | |
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the | |
// benefit is lost if 'b' is also tested. | |
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 | |
if (a == 0) { | |
return 0; | |
} | |
uint256 c = a * b; | |
require(c / a == b, "SafeMath: multiplication overflow"); | |
return c; | |
} | |
/** | |
* @dev Returns the integer division of two unsigned integers. Reverts on | |
* division by zero. The result is rounded towards zero. | |
* | |
* Counterpart to Solidity's `/` operator. Note: this function uses a | |
* `revert` opcode (which leaves remaining gas untouched) while Solidity | |
* uses an invalid opcode to revert (consuming all remaining gas). | |
* | |
* Requirements: | |
* - The divisor cannot be zero. | |
*/ | |
function div(uint256 a, uint256 b) internal pure returns (uint256) { | |
return div(a, b, "SafeMath: division by zero"); | |
} | |
/** | |
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on | |
* division by zero. The result is rounded towards zero. | |
* | |
* Counterpart to Solidity's `/` operator. Note: this function uses a | |
* `revert` opcode (which leaves remaining gas untouched) while Solidity | |
* uses an invalid opcode to revert (consuming all remaining gas). | |
* | |
* Requirements: | |
* - The divisor cannot be zero. | |
* | |
* _Available since v2.4.0._ | |
*/ | |
function div( | |
uint256 a, | |
uint256 b, | |
string memory errorMessage | |
) internal pure returns (uint256) { | |
// Solidity only automatically asserts when dividing by 0 | |
require(b > 0, errorMessage); | |
uint256 c = a / b; | |
// assert(a == b * c + a % b); // There is no case in which this doesn't hold | |
return c; | |
} | |
/** | |
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), | |
* Reverts when dividing by zero. | |
* | |
* Counterpart to Solidity's `%` operator. This function uses a `revert` | |
* opcode (which leaves remaining gas untouched) while Solidity uses an | |
* invalid opcode to revert (consuming all remaining gas). | |
* | |
* Requirements: | |
* - The divisor cannot be zero. | |
*/ | |
function mod(uint256 a, uint256 b) internal pure returns (uint256) { | |
return mod(a, b, "SafeMath: modulo by zero"); | |
} | |
/** | |
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), | |
* Reverts with custom message when dividing by zero. | |
* | |
* Counterpart to Solidity's `%` operator. This function uses a `revert` | |
* opcode (which leaves remaining gas untouched) while Solidity uses an | |
* invalid opcode to revert (consuming all remaining gas). | |
* | |
* Requirements: | |
* - The divisor cannot be zero. | |
* | |
* _Available since v2.4.0._ | |
*/ | |
function mod( | |
uint256 a, | |
uint256 b, | |
string memory errorMessage | |
) internal pure returns (uint256) { | |
require(b != 0, errorMessage); | |
return a % b; | |
} | |
} | |
// File: contracts/utils/Address.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @dev Collection of functions related to the address type, | |
*/ | |
library Address { | |
/** | |
* @dev Returns true if `account` is a contract. | |
* | |
* This test is non-exhaustive, and there may be false-negatives: during the | |
* execution of a contract's constructor, its address will be reported as | |
* not containing a contract. | |
* | |
* > It is unsafe to assume that an address for which this function returns | |
* false is an externally-owned account (EOA) and not a contract. | |
*/ | |
function isContract(address account) internal view returns (bool) { | |
// 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. | |
uint256 size; | |
// solhint-disable-next-line no-inline-assembly | |
assembly { | |
size := extcodesize(account) | |
} | |
return size > 0; | |
} | |
} | |
// File: contracts/drafts/Counters.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title Counters | |
* @author Matt Condon (@shrugs) | |
* @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number | |
* of elements in a mapping, issuing ERC721 ids, or counting request ids. | |
* | |
* Include with `using Counters for Counters.Counter;` | |
* Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the SafeMath | |
* overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never | |
* directly accessed. | |
*/ | |
library Counters { | |
using SafeMath for uint256; | |
struct Counter { | |
// This variable should never be directly accessed by users of the library: interactions must be restricted to | |
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add | |
// this feature: see https://github.com/ethereum/solidity/issues/4637 | |
uint256 _value; // default: 0 | |
} | |
function current(Counter storage counter) internal view returns (uint256) { | |
return counter._value; | |
} | |
function increment(Counter storage counter) internal { | |
counter._value += 1; | |
} | |
function decrement(Counter storage counter) internal { | |
counter._value = counter._value.sub(1); | |
} | |
} | |
// File: contracts/introspection/KIP13.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @dev Implementation of the `IKIP13` interface. | |
* | |
* Contracts may inherit from this and call `_registerInterface` to declare | |
* their support of an interface. | |
*/ | |
contract KIP13 is IKIP13 { | |
/* | |
* bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 | |
*/ | |
bytes4 private constant _INTERFACE_ID_KIP13 = 0x01ffc9a7; | |
/** | |
* @dev Mapping of interface ids to whether or not it's supported. | |
*/ | |
mapping(bytes4 => bool) private _supportedInterfaces; | |
constructor() internal { | |
// Derived contracts need only register support for their own interfaces, | |
// we register support for KIP13 itself here | |
_registerInterface(_INTERFACE_ID_KIP13); | |
} | |
/** | |
* @dev See `IKIP13.supportsInterface`. | |
* | |
* Time complexity O(1), guaranteed to always use less than 30 000 gas. | |
*/ | |
function supportsInterface(bytes4 interfaceId) | |
external | |
view | |
returns (bool) | |
{ | |
return _supportedInterfaces[interfaceId]; | |
} | |
/** | |
* @dev Registers the contract as an implementer of the interface defined by | |
* `interfaceId`. Support of the actual KIP13 interface is automatic and | |
* registering its interface id is not required. | |
* | |
* See `IKIP13.supportsInterface`. | |
* | |
* Requirements: | |
* | |
* - `interfaceId` cannot be the KIP13 invalid interface (`0xffffffff`). | |
*/ | |
function _registerInterface(bytes4 interfaceId) internal { | |
require(interfaceId != 0xffffffff, "KIP13: invalid interface id"); | |
_supportedInterfaces[interfaceId] = true; | |
} | |
} | |
// File: contracts/token/KIP17/KIP17.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title KIP17 Non-Fungible Token Standard basic implementation | |
* @dev see http://kips.klaytn.com/KIPs/kip-17-non_fungible_token | |
*/ | |
contract KIP17 is KIP13, IKIP17 { | |
using SafeMath for uint256; | |
using Address for address; | |
using Counters for Counters.Counter; | |
// Equals to `bytes4(keccak256("onKIP17Received(address,address,uint256,bytes)"))` | |
// which can be also obtained as `IKIP17Receiver(0).onKIP17Received.selector` | |
bytes4 private constant _KIP17_RECEIVED = 0x6745782b; | |
// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` | |
// which can be also obtained as `IERC721Receiver(0).onERC721Received.selector` | |
bytes4 private constant _ERC721_RECEIVED = 0x150b7a02; | |
// Mapping from token ID to owner | |
mapping(uint256 => address) private _tokenOwner; | |
// Mapping from token ID to approved address | |
mapping(uint256 => address) private _tokenApprovals; | |
// Mapping from owner to number of owned token | |
mapping(address => Counters.Counter) private _ownedTokensCount; | |
// Mapping from owner to operator approvals | |
mapping(address => mapping(address => bool)) private _operatorApprovals; | |
/* | |
* bytes4(keccak256('balanceOf(address)')) == 0x70a08231 | |
* bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e | |
* bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3 | |
* bytes4(keccak256('getApproved(uint256)')) == 0x081812fc | |
* bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465 | |
* bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c | |
* bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd | |
* bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e | |
* bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde | |
* | |
* => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^ | |
* 0xa22cb465 ^ 0xe985e9c ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd | |
*/ | |
bytes4 private constant _INTERFACE_ID_KIP17 = 0x80ac58cd; | |
constructor() public { | |
// register the supported interfaces to conform to KIP17 via KIP13 | |
_registerInterface(_INTERFACE_ID_KIP17); | |
} | |
/** | |
* @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), | |
"KIP17: balance query for the zero address" | |
); | |
return _ownedTokensCount[owner].current(); | |
} | |
/** | |
* @dev Gets the owner of the specified token ID. | |
* @param tokenId uint256 ID of the token to query the owner of | |
* @return 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), | |
"KIP17: owner query for nonexistent token" | |
); | |
return owner; | |
} | |
/** | |
* @dev Approves another address to transfer the given token ID | |
* The zero address indicates there is no approved address. | |
* There can only be one approved address per token at a given time. | |
* Can only be called by the token owner or an approved operator. | |
* @param to address to be approved for the given token ID | |
* @param tokenId uint256 ID of the token to be approved | |
*/ | |
function approve(address to, uint256 tokenId) public { | |
address owner = ownerOf(tokenId); | |
require(to != owner, "KIP17: approval to current owner"); | |
require( | |
msg.sender == owner || isApprovedForAll(owner, msg.sender), | |
"KIP17: approve caller is not owner nor approved for all" | |
); | |
_tokenApprovals[tokenId] = to; | |
emit Approval(owner, to, tokenId); | |
} | |
/** | |
* @dev Gets the approved address for a token ID, or zero if no address set | |
* Reverts if the token ID does not exist. | |
* @param tokenId uint256 ID of the token to query the approval of | |
* @return address currently approved for the given token ID | |
*/ | |
function getApproved(uint256 tokenId) public view returns (address) { | |
require( | |
_exists(tokenId), | |
"KIP17: approved query for nonexistent token" | |
); | |
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, "KIP17: approve to caller"); | |
_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 { | |
//solhint-disable-next-line max-line-length | |
require( | |
_isApprovedOrOwner(msg.sender, tokenId), | |
"KIP17: transfer caller is not owner nor approved" | |
); | |
_transferFrom(from, to, tokenId); | |
} | |
/** | |
* @dev Safely transfers the ownership of a given token ID to another address | |
* If the target address is a contract, it must implement `onKIP17Received`, | |
* which is called upon a safe transfer, and return the magic value | |
* `bytes4(keccak256("onKIP17Received(address,address,uint256,bytes)"))`; otherwise, | |
* the transfer is reverted. | |
* Requires the msg.sender to be the owner, approved, or operator | |
* @param from current owner of the token | |
* @param to address to receive the ownership of the given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
*/ | |
function safeTransferFrom( | |
address from, | |
address to, | |
uint256 tokenId | |
) public { | |
safeTransferFrom(from, to, tokenId, ""); | |
} | |
/** | |
* @dev Safely transfers the ownership of a given token ID to another address | |
* If the target address is a contract, it must implement `onKIP17Received`, | |
* which is called upon a safe transfer, and return the magic value | |
* `bytes4(keccak256("onKIP17Received(address,address,uint256,bytes)"))`; otherwise, | |
* the transfer is reverted. | |
* Requires the msg.sender to be the owner, approved, or operator | |
* @param from current owner of the token | |
* @param to address to receive the ownership of the given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
* @param _data bytes data to send along with a safe transfer check | |
*/ | |
function safeTransferFrom( | |
address from, | |
address to, | |
uint256 tokenId, | |
bytes memory _data | |
) public { | |
transferFrom(from, to, tokenId); | |
require( | |
_checkOnKIP17Received(from, to, tokenId, _data), | |
"KIP17: transfer to non KIP17Receiver implementer" | |
); | |
} | |
/** | |
* @dev Returns whether the specified token exists. | |
* @param tokenId uint256 ID of the token to query the existence of | |
* @return bool whether the token exists | |
*/ | |
function _exists(uint256 tokenId) internal view returns (bool) { | |
address owner = _tokenOwner[tokenId]; | |
return owner != address(0); | |
} | |
/** | |
* @dev Returns whether the given spender can transfer a given token ID. | |
* @param spender address of the spender to query | |
* @param tokenId uint256 ID of the token to be transferred | |
* @return bool whether the msg.sender is approved for the given token ID, | |
* is an operator of the owner, or is the owner of the token | |
*/ | |
function _isApprovedOrOwner(address spender, uint256 tokenId) | |
internal | |
view | |
returns (bool) | |
{ | |
require( | |
_exists(tokenId), | |
"KIP17: operator query for nonexistent token" | |
); | |
address owner = ownerOf(tokenId); | |
return (spender == owner || | |
getApproved(tokenId) == spender || | |
isApprovedForAll(owner, spender)); | |
} | |
/** | |
* @dev Internal function to mint a new token. | |
* Reverts if the given token ID already exists. | |
* @param to The address that will own the minted token | |
* @param tokenId uint256 ID of the token to be minted | |
*/ | |
function _mint(address to, uint256 tokenId) internal { | |
require(to != address(0), "KIP17: mint to the zero address"); | |
require(!_exists(tokenId), "KIP17: token already minted"); | |
_tokenOwner[tokenId] = to; | |
_ownedTokensCount[to].increment(); | |
emit Transfer(address(0), to, tokenId); | |
} | |
/** | |
* @dev Internal function to burn a specific token. | |
* Reverts if the token does not exist. | |
* Deprecated, use _burn(uint256) instead. | |
* @param owner owner of the token to burn | |
* @param tokenId uint256 ID of the token being burned | |
*/ | |
function _burn(address owner, uint256 tokenId) internal { | |
require( | |
ownerOf(tokenId) == owner, | |
"KIP17: burn of token that is not own" | |
); | |
_clearApproval(tokenId); | |
_ownedTokensCount[owner].decrement(); | |
_tokenOwner[tokenId] = address(0); | |
emit Transfer(owner, address(0), tokenId); | |
} | |
/** | |
* @dev Internal function to burn a specific token. | |
* Reverts if the token does not exist. | |
* @param tokenId uint256 ID of the token being burned | |
*/ | |
function _burn(uint256 tokenId) internal { | |
_burn(ownerOf(tokenId), tokenId); | |
} | |
/** | |
* @dev Internal function to transfer ownership of a given token ID to another address. | |
* As opposed to transferFrom, this imposes no restrictions on msg.sender. | |
* @param from current owner of the token | |
* @param to address to receive the ownership of the given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
*/ | |
function _transferFrom( | |
address from, | |
address to, | |
uint256 tokenId | |
) internal { | |
require( | |
ownerOf(tokenId) == from, | |
"KIP17: transfer of token that is not own" | |
); | |
require(to != address(0), "KIP17: transfer to the zero address"); | |
_clearApproval(tokenId); | |
_ownedTokensCount[from].decrement(); | |
_ownedTokensCount[to].increment(); | |
_tokenOwner[tokenId] = to; | |
emit Transfer(from, to, tokenId); | |
} | |
/** | |
* @dev Internal function to invoke `onKIP17Received` on a target address. | |
* The call is not executed if the target address is not a contract. | |
* | |
* This function is deprecated. | |
* @param from address representing the previous owner of the given token ID | |
* @param to target address that will receive the tokens | |
* @param tokenId uint256 ID of the token to be transferred | |
* @param _data bytes optional data to send along with the call | |
* @return bool whether the call correctly returned the expected magic value | |
*/ | |
function _checkOnKIP17Received( | |
address from, | |
address to, | |
uint256 tokenId, | |
bytes memory _data | |
) internal returns (bool) { | |
bool success; | |
bytes memory returndata; | |
if (!to.isContract()) { | |
return true; | |
} | |
// Logic for compatibility with ERC721. | |
(success, returndata) = to.call( | |
abi.encodeWithSelector( | |
_ERC721_RECEIVED, | |
msg.sender, | |
from, | |
tokenId, | |
_data | |
) | |
); | |
if ( | |
returndata.length != 0 && | |
abi.decode(returndata, (bytes4)) == _ERC721_RECEIVED | |
) { | |
return true; | |
} | |
(success, returndata) = to.call( | |
abi.encodeWithSelector( | |
_KIP17_RECEIVED, | |
msg.sender, | |
from, | |
tokenId, | |
_data | |
) | |
); | |
if ( | |
returndata.length != 0 && | |
abi.decode(returndata, (bytes4)) == _KIP17_RECEIVED | |
) { | |
return true; | |
} | |
return false; | |
} | |
/** | |
* @dev Private function to clear current approval of a given token ID. | |
* @param tokenId uint256 ID of the token to be transferred | |
*/ | |
function _clearApproval(uint256 tokenId) private { | |
if (_tokenApprovals[tokenId] != address(0)) { | |
_tokenApprovals[tokenId] = address(0); | |
} | |
} | |
} | |
// File: contracts/token/KIP17/IKIP17Enumerable.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title KIP-17 Non-Fungible Token Standard, optional enumeration extension | |
* @dev See http://kips.klaytn.com/KIPs/kip-17-non_fungible_token | |
*/ | |
contract IKIP17Enumerable is IKIP17 { | |
function totalSupply() public view returns (uint256); | |
function tokenOfOwnerByIndex(address owner, uint256 index) | |
public | |
view | |
returns (uint256 tokenId); | |
function tokenByIndex(uint256 index) public view returns (uint256); | |
} | |
// File: contracts/token/KIP17/KIP17Enumerable.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title KIP-17 Non-Fungible Token with optional enumeration extension logic | |
* @dev See http://kips.klaytn.com/KIPs/kip-17-non_fungible_token | |
*/ | |
contract KIP17Enumerable is KIP13, KIP17, IKIP17Enumerable { | |
// Mapping from owner to list of owned token IDs | |
mapping(address => uint256[]) private _ownedTokens; | |
// Mapping from token ID to index of the owner tokens list | |
mapping(uint256 => uint256) private _ownedTokensIndex; | |
// Array with all token ids, used for enumeration | |
uint256[] private _allTokens; | |
// Mapping from token id to position in the allTokens array | |
mapping(uint256 => uint256) private _allTokensIndex; | |
/* | |
* bytes4(keccak256('totalSupply()')) == 0x18160ddd | |
* bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59 | |
* bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7 | |
* | |
* => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63 | |
*/ | |
bytes4 private constant _INTERFACE_ID_KIP17_ENUMERABLE = 0x780e9d63; | |
/** | |
* @dev Constructor function. | |
*/ | |
constructor() public { | |
// register the supported interface to conform to KIP17Enumerable via KIP13 | |
_registerInterface(_INTERFACE_ID_KIP17_ENUMERABLE); | |
} | |
/** | |
* @dev Gets the token ID at a given index of the tokens list of the requested owner. | |
* @param owner address owning the tokens list to be accessed | |
* @param index uint256 representing the index to be accessed of the requested tokens list | |
* @return uint256 token ID at the given index of the tokens list owned by the requested address | |
*/ | |
function tokenOfOwnerByIndex(address owner, uint256 index) | |
public | |
view | |
returns (uint256) | |
{ | |
require( | |
index < balanceOf(owner), | |
"KIP17Enumerable: owner index out of bounds" | |
); | |
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(), | |
"KIP17Enumerable: global index out of bounds" | |
); | |
return _allTokens[index]; | |
} | |
/** | |
* @dev Internal function to transfer ownership of a given token ID to another address. | |
* As opposed to transferFrom, this imposes no restrictions on msg.sender. | |
* @param from current owner of the token | |
* @param to address to receive the ownership of the given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
*/ | |
function _transferFrom( | |
address from, | |
address to, | |
uint256 tokenId | |
) internal { | |
super._transferFrom(from, to, tokenId); | |
_removeTokenFromOwnerEnumeration(from, tokenId); | |
_addTokenToOwnerEnumeration(to, tokenId); | |
} | |
/** | |
* @dev Internal function to mint a new token. | |
* Reverts if the given token ID already exists. | |
* @param to address the beneficiary that will own the minted token | |
* @param tokenId uint256 ID of the token to be minted | |
*/ | |
function _mint(address to, uint256 tokenId) internal { | |
super._mint(to, tokenId); | |
_addTokenToOwnerEnumeration(to, tokenId); | |
_addTokenToAllTokensEnumeration(tokenId); | |
} | |
/** | |
* @dev Internal function to burn a specific token. | |
* Reverts if the token does not exist. | |
* Deprecated, use _burn(uint256) instead. | |
* @param owner owner of the token to burn | |
* @param tokenId uint256 ID of the token being burned | |
*/ | |
function _burn(address owner, uint256 tokenId) internal { | |
super._burn(owner, tokenId); | |
_removeTokenFromOwnerEnumeration(owner, tokenId); | |
// Since tokenId will be deleted, we can clear its slot in _ownedTokensIndex to trigger a gas refund | |
_ownedTokensIndex[tokenId] = 0; | |
_removeTokenFromAllTokensEnumeration(tokenId); | |
} | |
/** | |
* @dev Gets the list of token IDs of the requested owner. | |
* @param owner address owning the tokens | |
* @return uint256[] List of token IDs owned by the requested address | |
*/ | |
function _tokensOfOwner(address owner) | |
internal | |
view | |
returns (uint256[] storage) | |
{ | |
return _ownedTokens[owner]; | |
} | |
/** | |
* @dev Private function to add a token to this extension's ownership-tracking data structures. | |
* @param to address representing the new owner of the given token ID | |
* @param tokenId uint256 ID of the token to be added to the tokens list of the given address | |
*/ | |
function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { | |
_ownedTokensIndex[tokenId] = _ownedTokens[to].length; | |
_ownedTokens[to].push(tokenId); | |
} | |
/** | |
* @dev Private function to add a token to this extension's token tracking data structures. | |
* @param tokenId uint256 ID of the token to be added to the tokens list | |
*/ | |
function _addTokenToAllTokensEnumeration(uint256 tokenId) private { | |
_allTokensIndex[tokenId] = _allTokens.length; | |
_allTokens.push(tokenId); | |
} | |
/** | |
* @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that | |
* while the token is not assigned a new owner, the _ownedTokensIndex mapping is _not_ updated: this allows for | |
* gas optimizations e.g. when performing a transfer operation (avoiding double writes). | |
* This has O(1) time complexity, but alters the order of the _ownedTokens array. | |
* @param from address representing the previous owner of the given token ID | |
* @param tokenId uint256 ID of the token to be removed from the tokens list of the given address | |
*/ | |
function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) | |
private | |
{ | |
// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and | |
// then delete the last slot (swap and pop). | |
uint256 lastTokenIndex = _ownedTokens[from].length.sub(1); | |
uint256 tokenIndex = _ownedTokensIndex[tokenId]; | |
// When the token to delete is the last token, the swap operation is unnecessary | |
if (tokenIndex != lastTokenIndex) { | |
uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; | |
_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token | |
_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index | |
} | |
// This also deletes the contents at the last position of the array | |
_ownedTokens[from].length--; | |
// Note that _ownedTokensIndex[tokenId] hasn't been cleared: it still points to the old slot (now occupied by | |
// lastTokenId, or just over the end of the array if the token was the last one). | |
} | |
/** | |
* @dev Private function to remove a token from this extension's token tracking data structures. | |
* This has O(1) time complexity, but alters the order of the _allTokens array. | |
* @param tokenId uint256 ID of the token to be removed from the tokens list | |
*/ | |
function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { | |
// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and | |
// then delete the last slot (swap and pop). | |
uint256 lastTokenIndex = _allTokens.length.sub(1); | |
uint256 tokenIndex = _allTokensIndex[tokenId]; | |
// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so | |
// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding | |
// an 'if' statement (like in _removeTokenFromOwnerEnumeration) | |
uint256 lastTokenId = _allTokens[lastTokenIndex]; | |
_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token | |
_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index | |
// This also deletes the contents at the last position of the array | |
_allTokens.length--; | |
_allTokensIndex[tokenId] = 0; | |
} | |
} | |
// File: contracts/token/KIP17/IKIP17Metadata.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title KIP-17 Non-Fungible Token Standard, optional metadata extension | |
* @dev See http://kips.klaytn.com/KIPs/kip-17-non_fungible_token | |
*/ | |
contract IKIP17Metadata is IKIP17 { | |
function name() external view returns (string memory); | |
function symbol() external view returns (string memory); | |
function tokenURI(uint256 tokenId) external view returns (string memory); | |
} | |
// File: contracts/token/KIP17/KIP17Metadata.sol | |
pragma solidity ^0.5.0; | |
contract KIP17Metadata is KIP13, KIP17, IKIP17Metadata { | |
// Token name | |
string private _name; | |
// Token symbol | |
string private _symbol; | |
// Optional mapping for token URIs | |
mapping(uint256 => string) private _tokenURIs; | |
/* | |
* bytes4(keccak256('name()')) == 0x06fdde03 | |
* bytes4(keccak256('symbol()')) == 0x95d89b41 | |
* bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd | |
* | |
* => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f | |
*/ | |
bytes4 private constant _INTERFACE_ID_KIP17_METADATA = 0x5b5e139f; | |
/** | |
* @dev Constructor function | |
*/ | |
constructor(string memory name, string memory symbol) public { | |
_name = name; | |
_symbol = symbol; | |
// register the supported interfaces to conform to KIP17 via KIP13 | |
_registerInterface(_INTERFACE_ID_KIP17_METADATA); | |
} | |
/** | |
* @dev Gets the token name. | |
* @return string representing the token name | |
*/ | |
function name() external view returns (string memory) { | |
return _name; | |
} | |
/** | |
* @dev Gets the token symbol. | |
* @return string representing the token symbol | |
*/ | |
function symbol() external view returns (string memory) { | |
return _symbol; | |
} | |
/** | |
* @dev Returns an URI for a given token ID. | |
* Throws if the token ID does not exist. May return an empty string. | |
* @param tokenId uint256 ID of the token to query | |
*/ | |
function tokenURI(uint256 tokenId) external view returns (string memory) { | |
require( | |
_exists(tokenId), | |
"KIP17Metadata: URI query for nonexistent token" | |
); | |
return _tokenURIs[tokenId]; | |
} | |
/** | |
* @dev Internal function to set the token URI for a given token. | |
* Reverts if the token ID does not exist. | |
* @param tokenId uint256 ID of the token to set its URI | |
* @param uri string URI to assign | |
*/ | |
function _setTokenURI(uint256 tokenId, string memory uri) internal { | |
require( | |
_exists(tokenId), | |
"KIP17Metadata: URI set of nonexistent token" | |
); | |
_tokenURIs[tokenId] = uri; | |
} | |
/** | |
* @dev Internal function to burn a specific token. | |
* Reverts if the token does not exist. | |
* Deprecated, use _burn(uint256) instead. | |
* @param owner owner of the token to burn | |
* @param tokenId uint256 ID of the token being burned by the msg.sender | |
*/ | |
function _burn(address owner, uint256 tokenId) internal { | |
super._burn(owner, tokenId); | |
// Clear metadata (if any) | |
if (bytes(_tokenURIs[tokenId]).length != 0) { | |
delete _tokenURIs[tokenId]; | |
} | |
} | |
} | |
// File: contracts/token/KIP17/KIP17Full.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title Full KIP-17 Token | |
* This implementation includes all the required and some optional functionality of the KIP-17 standard | |
* Moreover, it includes approve all functionality using operator terminology | |
* @dev see http://kips.klaytn.com/KIPs/kip-17-non_fungible_token | |
*/ | |
contract KIP17Full is KIP17, KIP17Enumerable, KIP17Metadata { | |
constructor(string memory name, string memory symbol) | |
public | |
KIP17Metadata(name, symbol) | |
{ | |
// solhint-disable-previous-line no-empty-blocks | |
} | |
} | |
// File: contracts/access/Roles.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title Roles | |
* @dev Library for managing addresses assigned to a Role. | |
*/ | |
library Roles { | |
struct Role { | |
mapping(address => bool) bearer; | |
} | |
/** | |
* @dev Give an account access to this role. | |
*/ | |
function add(Role storage role, address account) internal { | |
require(!has(role, account), "Roles: account already has role"); | |
role.bearer[account] = true; | |
} | |
/** | |
* @dev Remove an account's access to this role. | |
*/ | |
function remove(Role storage role, address account) internal { | |
require(has(role, account), "Roles: account does not have role"); | |
role.bearer[account] = false; | |
} | |
/** | |
* @dev Check if an account has this role. | |
* @return bool | |
*/ | |
function has(Role storage role, address account) | |
internal | |
view | |
returns (bool) | |
{ | |
require(account != address(0), "Roles: account is the zero address"); | |
return role.bearer[account]; | |
} | |
} | |
// File: contracts/access/roles/MinterRole.sol | |
pragma solidity ^0.5.0; | |
contract MinterRole { | |
using Roles for Roles.Role; | |
event MinterAdded(address indexed account); | |
event MinterRemoved(address indexed account); | |
Roles.Role private _minters; | |
constructor() internal { | |
_addMinter(msg.sender); | |
} | |
modifier onlyMinter() { | |
require( | |
isMinter(msg.sender), | |
"MinterRole: caller does not have the Minter role" | |
); | |
_; | |
} | |
function isMinter(address account) public view returns (bool) { | |
return _minters.has(account); | |
} | |
function addMinter(address account) public onlyMinter { | |
_addMinter(account); | |
} | |
function renounceMinter() public { | |
_removeMinter(msg.sender); | |
} | |
function _addMinter(address account) internal { | |
_minters.add(account); | |
emit MinterAdded(account); | |
} | |
function _removeMinter(address account) internal { | |
_minters.remove(account); | |
emit MinterRemoved(account); | |
} | |
} | |
// File: contracts/token/KIP17/KIP17MetadataMintable.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title KIP17MetadataMintable | |
* @dev KIP17 minting logic with metadata. | |
*/ | |
contract KIP17MetadataMintable is KIP13, KIP17, KIP17Metadata, MinterRole { | |
/* | |
* bytes4(keccak256('mintWithTokenURI(address,uint256,string)')) == 0x50bb4e7f | |
* bytes4(keccak256('isMinter(address)')) == 0xaa271e1a | |
* bytes4(keccak256('addMinter(address)')) == 0x983b2d56 | |
* bytes4(keccak256('renounceMinter()')) == 0x98650275 | |
* | |
* => 0x50bb4e7f ^ 0xaa271e1a ^ 0x983b2d56 ^ 0x98650275 == 0xfac27f46 | |
*/ | |
bytes4 private constant _INTERFACE_ID_KIP17_METADATA_MINTABLE = 0xfac27f46; | |
/** | |
* @dev Constructor function. | |
*/ | |
constructor() public { | |
// register the supported interface to conform to KIP17Mintable via KIP13 | |
_registerInterface(_INTERFACE_ID_KIP17_METADATA_MINTABLE); | |
} | |
/** | |
* @dev Function to mint tokens. | |
* @param to The address that will receive the minted tokens. | |
* @param tokenId The token id to mint. | |
* @param tokenURI The token URI of the minted token. | |
* @return A boolean that indicates if the operation was successful. | |
*/ | |
function mintWithTokenURI( | |
address to, | |
uint256 tokenId, | |
string memory tokenURI | |
) public onlyMinter returns (bool) { | |
_mint(to, tokenId); | |
_setTokenURI(tokenId, tokenURI); | |
return true; | |
} | |
} | |
// File: contracts/token/KIP17/KIP17Mintable.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title KIP17Mintable | |
* @dev KIP17 minting logic. | |
*/ | |
contract KIP17Mintable is KIP17, MinterRole { | |
/* | |
* bytes4(keccak256('isMinter(address)')) == 0xaa271e1a | |
* bytes4(keccak256('addMinter(address)')) == 0x983b2d56 | |
* bytes4(keccak256('renounceMinter()')) == 0x98650275 | |
* bytes4(keccak256('mint(address,uint256)')) == 0x40c10f19 | |
* | |
* => 0xaa271e1a ^ 0x983b2d56 ^ 0x98650275 ^ 0x40c10f19 == 0xeab83e20 | |
*/ | |
bytes4 private constant _INTERFACE_ID_KIP17_MINTABLE = 0xeab83e20; | |
/** | |
* @dev Constructor function. | |
*/ | |
constructor() public { | |
// register the supported interface to conform to KIP17Mintable via KIP13 | |
_registerInterface(_INTERFACE_ID_KIP17_MINTABLE); | |
} | |
/** | |
* @dev Function to mint tokens. | |
* @param to The address that will receive the minted tokens. | |
* @param tokenId The token id to mint. | |
* @return A boolean that indicates if the operation was successful. | |
*/ | |
function mint(address to, uint256 tokenId) | |
public | |
onlyMinter | |
returns (bool) | |
{ | |
_mint(to, tokenId); | |
return true; | |
} | |
} | |
// File: contracts/token/KIP17/KIP17Burnable.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title KIP17 Burnable Token | |
* @dev KIP17 Token that can be irreversibly burned (destroyed). | |
* See http://kips.klaytn.com/KIPs/kip-17-non_fungible_token | |
*/ | |
contract KIP17Burnable is KIP13, KIP17 { | |
/* | |
* bytes4(keccak256('burn(uint256)')) == 0x42966c68 | |
* | |
* => 0x42966c68 == 0x42966c68 | |
*/ | |
bytes4 private constant _INTERFACE_ID_KIP17_BURNABLE = 0x42966c68; | |
/** | |
* @dev Constructor function. | |
*/ | |
constructor() public { | |
// register the supported interface to conform to KIP17Burnable via KIP13 | |
_registerInterface(_INTERFACE_ID_KIP17_BURNABLE); | |
} | |
/** | |
* @dev Burns a specific KIP17 token. | |
* @param tokenId uint256 id of the KIP17 token to be burned. | |
*/ | |
function burn(uint256 tokenId) public { | |
//solhint-disable-next-line max-line-length | |
require( | |
_isApprovedOrOwner(msg.sender, tokenId), | |
"KIP17Burnable: caller is not owner nor approved" | |
); | |
_burn(tokenId); | |
} | |
} | |
// File: contracts/access/roles/PauserRole.sol | |
pragma solidity ^0.5.0; | |
contract PauserRole { | |
using Roles for Roles.Role; | |
event PauserAdded(address indexed account); | |
event PauserRemoved(address indexed account); | |
Roles.Role private _pausers; | |
constructor() internal { | |
_addPauser(msg.sender); | |
} | |
modifier onlyPauser() { | |
require( | |
isPauser(msg.sender), | |
"PauserRole: caller does not have the Pauser role" | |
); | |
_; | |
} | |
function isPauser(address account) public view returns (bool) { | |
return _pausers.has(account); | |
} | |
function addPauser(address account) public onlyPauser { | |
_addPauser(account); | |
} | |
function renouncePauser() public { | |
_removePauser(msg.sender); | |
} | |
function _addPauser(address account) internal { | |
_pausers.add(account); | |
emit PauserAdded(account); | |
} | |
function _removePauser(address account) internal { | |
_pausers.remove(account); | |
emit PauserRemoved(account); | |
} | |
} | |
// File: contracts/lifecycle/Pausable.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @dev Contract module which allows children to implement an emergency stop | |
* mechanism that can be triggered by an authorized account. | |
* | |
* This module is used through inheritance. It will make available the | |
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to | |
* the functions of your contract. Note that they will not be pausable by | |
* simply including this module, only once the modifiers are put in place. | |
*/ | |
contract Pausable is PauserRole { | |
/** | |
* @dev Emitted when the pause is triggered by a pauser (`account`). | |
*/ | |
event Paused(address account); | |
/** | |
* @dev Emitted when the pause is lifted by a pauser (`account`). | |
*/ | |
event Unpaused(address account); | |
bool private _paused; | |
/** | |
* @dev Initializes the contract in unpaused state. Assigns the Pauser role | |
* to the deployer. | |
*/ | |
constructor() internal { | |
_paused = false; | |
} | |
/** | |
* @dev Returns true if the contract is paused, and false otherwise. | |
*/ | |
function paused() public view returns (bool) { | |
return _paused; | |
} | |
/** | |
* @dev Modifier to make a function callable only when the contract is not paused. | |
*/ | |
modifier whenNotPaused() { | |
require(!_paused, "Pausable: paused"); | |
_; | |
} | |
/** | |
* @dev Modifier to make a function callable only when the contract is paused. | |
*/ | |
modifier whenPaused() { | |
require(_paused, "Pausable: not paused"); | |
_; | |
} | |
/** | |
* @dev Called by a pauser to pause, triggers stopped state. | |
*/ | |
function pause() public onlyPauser whenNotPaused { | |
_paused = true; | |
emit Paused(msg.sender); | |
} | |
/** | |
* @dev Called by a pauser to unpause, returns to normal state. | |
*/ | |
function unpause() public onlyPauser whenPaused { | |
_paused = false; | |
emit Unpaused(msg.sender); | |
} | |
} | |
// File: contracts/token/KIP17/KIP17Pausable.sol | |
pragma solidity ^0.5.0; | |
/** | |
* @title KIP17 Non-Fungible Pausable token | |
* @dev KIP17 modified with pausable transfers. | |
*/ | |
contract KIP17Pausable is KIP13, KIP17, Pausable { | |
/* | |
* bytes4(keccak256('paused()')) == 0x5c975abb | |
* bytes4(keccak256('pause()')) == 0x8456cb59 | |
* bytes4(keccak256('unpause()')) == 0x3f4ba83a | |
* bytes4(keccak256('isPauser(address)')) == 0x46fbf68e | |
* bytes4(keccak256('addPauser(address)')) == 0x82dc1ec4 | |
* bytes4(keccak256('renouncePauser()')) == 0x6ef8d66d | |
* | |
* => 0x5c975abb ^ 0x8456cb59 ^ 0x3f4ba83a ^ 0x46fbf68e ^ 0x82dc1ec4 ^ 0x6ef8d66d == 0x4d5507ff | |
*/ | |
bytes4 private constant _INTERFACE_ID_KIP17_PAUSABLE = 0x4d5507ff; | |
/** | |
* @dev Constructor function. | |
*/ | |
constructor() public { | |
// register the supported interface to conform to KIP17Pausable via KIP13 | |
_registerInterface(_INTERFACE_ID_KIP17_PAUSABLE); | |
} | |
function approve(address to, uint256 tokenId) public whenNotPaused { | |
super.approve(to, tokenId); | |
} | |
function setApprovalForAll(address to, bool approved) public whenNotPaused { | |
super.setApprovalForAll(to, approved); | |
} | |
function transferFrom( | |
address from, | |
address to, | |
uint256 tokenId | |
) public whenNotPaused { | |
super.transferFrom(from, to, tokenId); | |
} | |
} | |
// File: contracts/token/KIP17/KIP17Token.sol | |
pragma solidity ^0.5.0; | |
contract KIP17Token is | |
KIP17Full, | |
KIP17Mintable, | |
KIP17MetadataMintable, | |
KIP17Burnable, | |
KIP17Pausable | |
{ | |
constructor(string memory name, string memory symbol) | |
public | |
KIP17Full(name, symbol) | |
{} | |
} |
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