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// File: openzeppelin-solidity/contracts/introspection/IERC165.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @title IERC165 | |
* @dev https://eips.ethereum.org/EIPS/eip-165 | |
*/ | |
interface IERC165 { | |
/** | |
* @notice Query if a contract implements an interface | |
* @param interfaceId The interface identifier, as specified in ERC-165 | |
* @dev Interface identification is specified in ERC-165. This function | |
* uses less than 30,000 gas. | |
*/ | |
function supportsInterface(bytes4 interfaceId) external view returns (bool); | |
} | |
// File: openzeppelin-solidity/contracts/token/ERC721/IERC721.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @title ERC721 Non-Fungible Token Standard basic interface | |
* @dev see https://eips.ethereum.org/EIPS/eip-721 | |
*/ | |
contract IERC721 is IERC165 { | |
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); | |
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); | |
event ApprovalForAll(address indexed owner, address indexed operator, bool approved); | |
function balanceOf(address owner) public view returns (uint256 balance); | |
function ownerOf(uint256 tokenId) public view returns (address owner); | |
function approve(address to, uint256 tokenId) public; | |
function getApproved(uint256 tokenId) public view returns (address operator); | |
function setApprovalForAll(address operator, bool _approved) public; | |
function isApprovedForAll(address owner, address operator) public view returns (bool); | |
function transferFrom(address from, address to, uint256 tokenId) public; | |
function safeTransferFrom(address from, address to, uint256 tokenId) public; | |
function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public; | |
} | |
// File: openzeppelin-solidity/contracts/token/ERC721/IERC721Receiver.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @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: openzeppelin-solidity/contracts/math/SafeMath.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @title SafeMath | |
* @dev Unsigned math operations with safety checks that revert on error | |
*/ | |
library SafeMath { | |
/** | |
* @dev Multiplies two unsigned integers, reverts on overflow. | |
*/ | |
function mul(uint256 a, uint256 b) internal pure returns (uint256) { | |
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the | |
// benefit is lost if 'b' is also tested. | |
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522 | |
if (a == 0) { | |
return 0; | |
} | |
uint256 c = a * b; | |
require(c / a == b); | |
return c; | |
} | |
/** | |
* @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero. | |
*/ | |
function div(uint256 a, uint256 b) internal pure returns (uint256) { | |
// Solidity only automatically asserts when dividing by 0 | |
require(b > 0); | |
uint256 c = a / b; | |
// assert(a == b * c + a % b); // There is no case in which this doesn't hold | |
return c; | |
} | |
/** | |
* @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend). | |
*/ | |
function sub(uint256 a, uint256 b) internal pure returns (uint256) { | |
require(b <= a); | |
uint256 c = a - b; | |
return c; | |
} | |
/** | |
* @dev Adds two unsigned integers, reverts on overflow. | |
*/ | |
function add(uint256 a, uint256 b) internal pure returns (uint256) { | |
uint256 c = a + b; | |
require(c >= a); | |
return c; | |
} | |
/** | |
* @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo), | |
* reverts when dividing by zero. | |
*/ | |
function mod(uint256 a, uint256 b) internal pure returns (uint256) { | |
require(b != 0); | |
return a % b; | |
} | |
} | |
// File: openzeppelin-solidity/contracts/utils/Address.sol | |
pragma solidity ^0.5.2; | |
/** | |
* Utility library of inline functions on addresses | |
*/ | |
library Address { | |
/** | |
* Returns whether the target address is a contract | |
* @dev This function will return false if invoked during the constructor of a contract, | |
* as the code is not actually created until after the constructor finishes. | |
* @param account address of the account to check | |
* @return whether the target address is a contract | |
*/ | |
function isContract(address account) internal view returns (bool) { | |
uint256 size; | |
// XXX Currently there is no better way to check if there is a contract in an address | |
// than to check the size of the code at that address. | |
// See https://ethereum.stackexchange.com/a/14016/36603 | |
// for more details about how this works. | |
// TODO Check this again before the Serenity release, because all addresses will be | |
// contracts then. | |
// solhint-disable-next-line no-inline-assembly | |
assembly { size := extcodesize(account) } | |
return size > 0; | |
} | |
} | |
// File: openzeppelin-solidity/contracts/drafts/Counters.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @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: openzeppelin-solidity/contracts/introspection/ERC165.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @title ERC165 | |
* @author Matt Condon (@shrugs) | |
* @dev Implements ERC165 using a lookup table. | |
*/ | |
contract ERC165 is IERC165 { | |
bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; | |
/* | |
* 0x01ffc9a7 === | |
* bytes4(keccak256('supportsInterface(bytes4)')) | |
*/ | |
/** | |
* @dev a mapping of interface id to whether or not it's supported | |
*/ | |
mapping(bytes4 => bool) private _supportedInterfaces; | |
/** | |
* @dev A contract implementing SupportsInterfaceWithLookup | |
* implement ERC165 itself | |
*/ | |
constructor () internal { | |
_registerInterface(_INTERFACE_ID_ERC165); | |
} | |
/** | |
* @dev implement supportsInterface(bytes4) using a lookup table | |
*/ | |
function supportsInterface(bytes4 interfaceId) external view returns (bool) { | |
return _supportedInterfaces[interfaceId]; | |
} | |
/** | |
* @dev internal method for registering an interface | |
*/ | |
function _registerInterface(bytes4 interfaceId) internal { | |
require(interfaceId != 0xffffffff); | |
_supportedInterfaces[interfaceId] = true; | |
} | |
} | |
// File: openzeppelin-solidity/contracts/token/ERC721/ERC721.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @title ERC721 Non-Fungible Token Standard basic implementation | |
* @dev see https://eips.ethereum.org/EIPS/eip-721 | |
*/ | |
contract ERC721 is ERC165, IERC721 { | |
using SafeMath for uint256; | |
using Address for address; | |
using Counters for Counters.Counter; | |
// 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 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd; | |
/* | |
* 0x80ac58cd === | |
* bytes4(keccak256('balanceOf(address)')) ^ | |
* bytes4(keccak256('ownerOf(uint256)')) ^ | |
* bytes4(keccak256('approve(address,uint256)')) ^ | |
* bytes4(keccak256('getApproved(uint256)')) ^ | |
* bytes4(keccak256('setApprovalForAll(address,bool)')) ^ | |
* bytes4(keccak256('isApprovedForAll(address,address)')) ^ | |
* bytes4(keccak256('transferFrom(address,address,uint256)')) ^ | |
* bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^ | |
* bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) | |
*/ | |
constructor () public { | |
// register the supported interfaces to conform to ERC721 via ERC165 | |
_registerInterface(_INTERFACE_ID_ERC721); | |
} | |
/** | |
* @dev Gets the balance of the specified address | |
* @param owner address to query the balance of | |
* @return uint256 representing the amount owned by the passed address | |
*/ | |
function balanceOf(address owner) public view returns (uint256) { | |
require(owner != address(0)); | |
return _ownedTokensCount[owner].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)); | |
return owner; | |
} | |
/** | |
* @dev Approves another address to transfer the given token ID | |
* The zero address indicates there is no approved address. | |
* There can only be one approved address per token at a given time. | |
* Can only be called by the token owner or an approved operator. | |
* @param to address to be approved for the given token ID | |
* @param tokenId uint256 ID of the token to be approved | |
*/ | |
function approve(address to, uint256 tokenId) public { | |
address owner = ownerOf(tokenId); | |
require(to != owner); | |
require(msg.sender == owner || isApprovedForAll(owner, msg.sender)); | |
_tokenApprovals[tokenId] = to; | |
emit Approval(owner, to, tokenId); | |
} | |
/** | |
* @dev Gets the approved address for a token ID, or zero if no address set | |
* Reverts if the token ID does not exist. | |
* @param tokenId uint256 ID of the token to query the approval of | |
* @return address currently approved for the given token ID | |
*/ | |
function getApproved(uint256 tokenId) public view returns (address) { | |
require(_exists(tokenId)); | |
return _tokenApprovals[tokenId]; | |
} | |
/** | |
* @dev Sets or unsets the approval of a given operator | |
* An operator is allowed to transfer all tokens of the sender on their behalf | |
* @param to operator address to set the approval | |
* @param approved representing the status of the approval to be set | |
*/ | |
function setApprovalForAll(address to, bool approved) public { | |
require(to != msg.sender); | |
_operatorApprovals[msg.sender][to] = approved; | |
emit ApprovalForAll(msg.sender, to, approved); | |
} | |
/** | |
* @dev Tells whether an operator is approved by a given owner | |
* @param owner owner address which you want to query the approval of | |
* @param operator operator address which you want to query the approval of | |
* @return bool whether the given operator is approved by the given owner | |
*/ | |
function isApprovedForAll(address owner, address operator) public view returns (bool) { | |
return _operatorApprovals[owner][operator]; | |
} | |
/** | |
* @dev Transfers the ownership of a given token ID to another address | |
* Usage of this method is discouraged, use `safeTransferFrom` whenever possible | |
* Requires the msg.sender to be the owner, approved, or operator | |
* @param from current owner of the token | |
* @param to address to receive the ownership of the given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
*/ | |
function transferFrom(address from, address to, uint256 tokenId) public { | |
require(_isApprovedOrOwner(msg.sender, tokenId)); | |
_transferFrom(from, to, tokenId); | |
} | |
/** | |
* @dev Safely transfers the ownership of a given token ID to another address | |
* If the target address is a contract, it must implement `onERC721Received`, | |
* which is called upon a safe transfer, and return the magic value | |
* `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, | |
* the transfer is reverted. | |
* Requires the msg.sender to be the owner, approved, or operator | |
* @param from current owner of the token | |
* @param to address to receive the ownership of the given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
*/ | |
function safeTransferFrom(address from, address to, uint256 tokenId) public { | |
safeTransferFrom(from, to, tokenId, ""); | |
} | |
/** | |
* @dev Safely transfers the ownership of a given token ID to another address | |
* If the target address is a contract, it must implement `onERC721Received`, | |
* which is called upon a safe transfer, and return the magic value | |
* `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, | |
* the transfer is reverted. | |
* Requires the msg.sender to be the owner, approved, or operator | |
* @param from current owner of the token | |
* @param to address to receive the ownership of the given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
* @param _data bytes data to send along with a safe transfer check | |
*/ | |
function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public { | |
transferFrom(from, to, tokenId); | |
require(_checkOnERC721Received(from, to, tokenId, _data)); | |
} | |
/** | |
* @dev Returns whether the specified token exists | |
* @param tokenId uint256 ID of the token to query the existence of | |
* @return 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) { | |
address owner = ownerOf(tokenId); | |
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender)); | |
} | |
/** | |
* @dev Internal function to mint a new token | |
* Reverts if the given token ID already exists | |
* @param to The address that will own the minted token | |
* @param tokenId uint256 ID of the token to be minted | |
*/ | |
function _mint(address to, uint256 tokenId) internal { | |
require(to != address(0)); | |
require(!_exists(tokenId)); | |
_tokenOwner[tokenId] = to; | |
_ownedTokensCount[to].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); | |
_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); | |
require(to != address(0)); | |
_clearApproval(tokenId); | |
_ownedTokensCount[from].decrement(); | |
_ownedTokensCount[to].increment(); | |
_tokenOwner[tokenId] = to; | |
emit Transfer(from, to, tokenId); | |
} | |
/** | |
* @dev Internal function to invoke `onERC721Received` on a target address | |
* The call is not executed if the target address is not a contract | |
* @param from address representing the previous owner of the given token ID | |
* @param to target address that will receive the tokens | |
* @param tokenId uint256 ID of the token to be transferred | |
* @param _data bytes optional data to send along with the call | |
* @return bool whether the call correctly returned the expected magic value | |
*/ | |
function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data) | |
internal returns (bool) | |
{ | |
if (!to.isContract()) { | |
return true; | |
} | |
bytes4 retval = IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data); | |
return (retval == _ERC721_RECEIVED); | |
} | |
/** | |
* @dev Private function to clear current approval of a given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
*/ | |
function _clearApproval(uint256 tokenId) private { | |
if (_tokenApprovals[tokenId] != address(0)) { | |
_tokenApprovals[tokenId] = address(0); | |
} | |
} | |
} | |
// File: openzeppelin-solidity/contracts/access/Roles.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @title Roles | |
* @dev Library for managing addresses assigned to a Role. | |
*/ | |
library Roles { | |
struct Role { | |
mapping (address => bool) bearer; | |
} | |
/** | |
* @dev give an account access to this role | |
*/ | |
function add(Role storage role, address account) internal { | |
require(account != address(0)); | |
require(!has(role, account)); | |
role.bearer[account] = true; | |
} | |
/** | |
* @dev remove an account's access to this role | |
*/ | |
function remove(Role storage role, address account) internal { | |
require(account != address(0)); | |
require(has(role, account)); | |
role.bearer[account] = false; | |
} | |
/** | |
* @dev check if an account has this role | |
* @return bool | |
*/ | |
function has(Role storage role, address account) internal view returns (bool) { | |
require(account != address(0)); | |
return role.bearer[account]; | |
} | |
} | |
// File: openzeppelin-solidity/contracts/access/roles/MinterRole.sol | |
pragma solidity ^0.5.2; | |
contract MinterRole { | |
using Roles for Roles.Role; | |
event MinterAdded(address indexed account); | |
event MinterRemoved(address indexed account); | |
Roles.Role private _minters; | |
constructor () internal { | |
_addMinter(msg.sender); | |
} | |
modifier onlyMinter() { | |
require(isMinter(msg.sender)); | |
_; | |
} | |
function isMinter(address account) public view returns (bool) { | |
return _minters.has(account); | |
} | |
function addMinter(address account) public onlyMinter { | |
_addMinter(account); | |
} | |
function renounceMinter() public { | |
_removeMinter(msg.sender); | |
} | |
function _addMinter(address account) internal { | |
_minters.add(account); | |
emit MinterAdded(account); | |
} | |
function _removeMinter(address account) internal { | |
_minters.remove(account); | |
emit MinterRemoved(account); | |
} | |
} | |
// File: openzeppelin-solidity/contracts/token/ERC721/ERC721Mintable.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @title ERC721Mintable | |
* @dev ERC721 minting logic | |
*/ | |
contract ERC721Mintable is ERC721, MinterRole { | |
/** | |
* @dev Function to mint tokens | |
* @param to The address that will receive the minted tokens. | |
* @param tokenId The token id to mint. | |
* @return A boolean that indicates if the operation was successful. | |
*/ | |
function mint(address to, uint256 tokenId) public onlyMinter returns (bool) { | |
_mint(to, tokenId); | |
return true; | |
} | |
} | |
// File: openzeppelin-solidity/contracts/token/ERC721/IERC721Metadata.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension | |
* @dev See https://eips.ethereum.org/EIPS/eip-721 | |
*/ | |
contract IERC721Metadata is IERC721 { | |
function name() external view returns (string memory); | |
function symbol() external view returns (string memory); | |
function tokenURI(uint256 tokenId) external view returns (string memory); | |
} | |
// File: openzeppelin-solidity/contracts/token/ERC721/ERC721Metadata.sol | |
pragma solidity ^0.5.2; | |
contract ERC721Metadata is ERC165, ERC721, IERC721Metadata { | |
// Token name | |
string private _name; | |
// Token symbol | |
string private _symbol; | |
// Optional mapping for token URIs | |
mapping(uint256 => string) private _tokenURIs; | |
bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f; | |
/* | |
* 0x5b5e139f === | |
* bytes4(keccak256('name()')) ^ | |
* bytes4(keccak256('symbol()')) ^ | |
* bytes4(keccak256('tokenURI(uint256)')) | |
*/ | |
/** | |
* @dev Constructor function | |
*/ | |
constructor (string memory name, string memory symbol) public { | |
_name = name; | |
_symbol = symbol; | |
// register the supported interfaces to conform to ERC721 via ERC165 | |
_registerInterface(_INTERFACE_ID_ERC721_METADATA); | |
} | |
/** | |
* @dev Gets the token name | |
* @return string representing the token name | |
*/ | |
function name() external view returns (string memory) { | |
return _name; | |
} | |
/** | |
* @dev Gets the token symbol | |
* @return string representing the token symbol | |
*/ | |
function symbol() external view returns (string memory) { | |
return _symbol; | |
} | |
/** | |
* @dev Returns an URI for a given token ID | |
* Throws if the token ID does not exist. May return an empty string. | |
* @param tokenId uint256 ID of the token to query | |
*/ | |
function tokenURI(uint256 tokenId) external view returns (string memory) { | |
require(_exists(tokenId)); | |
return _tokenURIs[tokenId]; | |
} | |
/** | |
* @dev Internal function to set the token URI for a given token | |
* Reverts if the token ID does not exist | |
* @param tokenId uint256 ID of the token to set its URI | |
* @param uri string URI to assign | |
*/ | |
function _setTokenURI(uint256 tokenId, string memory uri) internal { | |
require(_exists(tokenId)); | |
_tokenURIs[tokenId] = uri; | |
} | |
/** | |
* @dev Internal function to burn a specific token | |
* Reverts if the token does not exist | |
* Deprecated, use _burn(uint256) instead | |
* @param owner owner of the token to burn | |
* @param tokenId uint256 ID of the token being burned by the msg.sender | |
*/ | |
function _burn(address owner, uint256 tokenId) internal { | |
super._burn(owner, tokenId); | |
// Clear metadata (if any) | |
if (bytes(_tokenURIs[tokenId]).length != 0) { | |
delete _tokenURIs[tokenId]; | |
} | |
} | |
} | |
// File: openzeppelin-solidity/contracts/token/ERC721/ERC721MetadataMintable.sol | |
pragma solidity ^0.5.2; | |
/** | |
* @title ERC721MetadataMintable | |
* @dev ERC721 minting logic with metadata | |
*/ | |
contract ERC721MetadataMintable is ERC721, ERC721Metadata, MinterRole { | |
/** | |
* @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/common/tokens/ERC721PlasmaMintable.sol | |
pragma solidity ^0.5.2; | |
contract ERC721PlasmaMintable is ERC721Mintable, ERC721MetadataMintable { | |
constructor(string memory name, string memory symbol) | |
public | |
ERC721Metadata(name, symbol) | |
{} | |
/** | |
* @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) public view returns (bool) { | |
return _exists(tokenId); | |
} | |
} |
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