文件 1 的 17:Address.sol
pragma solidity ^0.8.0;
library Address {
function isContract(address account) internal view returns (bool) {
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
if (returndata.length > 0) {
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
文件 2 的 17:AshleyMetagolden.sol
pragma solidity ^0.8.0;
import './ERC721EnumerableLite.sol';
import './Signed.sol';
import "./Strings.sol";
contract AshleyMetagolden is ERC721EnumerableLite, Signed {
using Strings for uint;
uint public MGOLD_MaxMint = 10;
uint public MGOLD_MaxSupply = 862;
uint public MGOLD_MintPrice = 0.16 ether;
bool public MGOLD_SaleActive = false;
string private MGOLD_TokenURI = 'https://gateway.pinata.cloud/ipfs/QmXtR8i3EbZDgio9rz24KUWBcqg3S5avZdA34VqEvUYv4v/';
address public MGOLD_Address1 = 0xAE8EaBB58327f856D93248c2a009291d26BfdE18;
address public MGOLD_Address2 = 0xAE8EaBB58327f856D93248c2a009291d26BfdE18;
constructor()
Delegated()
ERC721B("Ashley Longshore x Metagolden", "MGOLD", 0){
}
fallback() external payable {}
receive() external payable {}
function tokenURI(uint tokenId) external view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
return string(abi.encodePacked(MGOLD_TokenURI, tokenId.toString() ));
}
function mint( uint quantity ) external payable {
require( MGOLD_SaleActive, "Ashley Longshore x Metagolden Sale is not active" );
require( quantity <= MGOLD_MaxMint, "Ashley Longshore x Metagolden mint is too big" );
require( msg.value >= MGOLD_MintPrice * quantity, "Invalid Ether Amount" );
uint supply = totalSupply();
require( supply + quantity <= MGOLD_MaxSupply, "Not enough NFTs left :(" );
for(uint i; i < quantity; ++i){
_mint( msg.sender, supply++ );
}
}
function burnTokens(address account, uint[] calldata tokenIds) external payable onlyDelegates {
for(uint i; i < tokenIds.length; ++i ){
require( _owners[ tokenIds[i] ] == account, "Could not verify owner" );
_burn( tokenIds[i] );
}
}
function fiat_mint(uint[] calldata quantity, address[] calldata recipient) external payable onlyDelegates {
require(quantity.length == recipient.length, "Quantity array and recipient array are not equal" );
uint totalQuantity;
uint supply = totalSupply();
for(uint i; i < quantity.length; ++i){
totalQuantity += quantity[i];
}
require( supply + totalQuantity <= MGOLD_MaxSupply, "Not enough NFTs left :(" );
delete totalQuantity;
for(uint i; i < recipient.length; ++i){
for(uint j; j < quantity[i]; ++j){
_mint( recipient[i], supply++ );
}
}
}
function Set_MGOLD_SaleActive(bool MGOLD_SaleActive_ ) external onlyDelegates{
require( MGOLD_SaleActive != MGOLD_SaleActive_ , "Same value as before" );
MGOLD_SaleActive = MGOLD_SaleActive_;
}
function setBaseURI( string calldata baseURI ) external onlyDelegates {
MGOLD_TokenURI = baseURI;
}
function setValues(uint _MGOLD_MaxMint, uint _MGOLD_MaxSupply, uint _price, address _MGOLD_Address1, address _MGOLD_Address2 ) external onlyDelegates {
require( MGOLD_MaxMint != _MGOLD_MaxMint || MGOLD_MaxSupply != _MGOLD_MaxSupply || MGOLD_MintPrice != _price || MGOLD_Address1 != _MGOLD_Address1 || MGOLD_Address2 != _MGOLD_Address2, "Same values as before" );
require(_MGOLD_MaxSupply >= totalSupply(), "New supply is less than previous supply" );
MGOLD_MaxMint = _MGOLD_MaxMint;
MGOLD_MaxSupply = _MGOLD_MaxSupply;
MGOLD_MintPrice = _price;
MGOLD_Address1 = _MGOLD_Address1;
MGOLD_Address2 = _MGOLD_Address2;
}
function finalize() external onlyOwner {
selfdestruct(payable(owner()));
}
function emergency_withdraw() external onlyOwner {
(bool emergency_withdraw_status,) = MGOLD_Address1.call{value: address(this).balance}("");
require(emergency_withdraw_status, "Failed Emergency Withdraw");
}
function withdraw() external {
require(address(this).balance > 0, "Not enough ether to withdraw");
uint256 walletBalance = address(this).balance;
(bool withdrew_address1,) = MGOLD_Address1.call{value: walletBalance * 50 / 100}("");
(bool withdrew_address2,) = MGOLD_Address2.call{value: walletBalance * 50 / 100}("");
require(withdrew_address1 && withdrew_address2, "Failed withdraw");
}
function _beforeTokenTransfer(address from, address to, uint tokenId) internal override {
if( from != address(0) )
--_balances[from];
if( to != address(0) )
++_balances[to];
}
function _burn(uint tokenId) internal override {
address from = ownerOf(tokenId);
_approve(owner(), tokenId);
_beforeTokenTransfer( from, address(0), tokenId );
++_burned;
_owners[tokenId] = address(0);
emit Transfer(from, address(0), tokenId);
}
function _mint(address to, uint tokenId) internal override {
_beforeTokenTransfer( address(0), to, tokenId );
_owners.push(to);
emit Transfer(address(0), to, tokenId);
}
}
文件 3 的 17:Context.sol
pragma solidity ^0.8.0;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
文件 4 的 17:Delegated.sol
pragma solidity ^0.8.0;
import "./Ownable.sol";
contract Delegated is Ownable{
mapping(address => bool) internal _delegates;
constructor(){
_delegates[owner()] = true;
}
modifier onlyDelegates {
require(_delegates[msg.sender], "Invalid delegate" );
_;
}
function isDelegate( address addr ) external view onlyOwner returns ( bool ){
return _delegates[addr];
}
function setDelegate( address addr, bool isDelegate_ ) external onlyOwner{
_delegates[addr] = isDelegate_;
}
function transferOwnership(address newOwner) public virtual override onlyOwner {
_delegates[newOwner] = true;
super.transferOwnership( newOwner );
}
}
文件 5 的 17:ECDSA.sol
pragma solidity ^0.8.0;
library ECDSA {
enum RecoverError {
NoError,
InvalidSignature,
InvalidSignatureLength,
InvalidSignatureS,
InvalidSignatureV
}
function _throwError(RecoverError error) private pure {
if (error == RecoverError.NoError) {
return;
} else if (error == RecoverError.InvalidSignature) {
revert("ECDSA: invalid signature");
} else if (error == RecoverError.InvalidSignatureLength) {
revert("ECDSA: invalid signature length");
} else if (error == RecoverError.InvalidSignatureS) {
revert("ECDSA: invalid signature 's' value");
} else if (error == RecoverError.InvalidSignatureV) {
revert("ECDSA: invalid signature 'v' value");
}
}
function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
if (signature.length == 65) {
bytes32 r;
bytes32 s;
uint8 v;
assembly {
r := mload(add(signature, 0x20))
s := mload(add(signature, 0x40))
v := byte(0, mload(add(signature, 0x60)))
}
return tryRecover(hash, v, r, s);
} else if (signature.length == 64) {
bytes32 r;
bytes32 vs;
assembly {
r := mload(add(signature, 0x20))
vs := mload(add(signature, 0x40))
}
return tryRecover(hash, r, vs);
} else {
return (address(0), RecoverError.InvalidSignatureLength);
}
}
function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
(address recovered, RecoverError error) = tryRecover(hash, signature);
_throwError(error);
return recovered;
}
function tryRecover(
bytes32 hash,
bytes32 r,
bytes32 vs
) internal pure returns (address, RecoverError) {
bytes32 s;
uint8 v;
assembly {
s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
v := add(shr(255, vs), 27)
}
return tryRecover(hash, v, r, s);
}
function recover(
bytes32 hash,
bytes32 r,
bytes32 vs
) internal pure returns (address) {
(address recovered, RecoverError error) = tryRecover(hash, r, vs);
_throwError(error);
return recovered;
}
function tryRecover(
bytes32 hash,
uint8 v,
bytes32 r,
bytes32 s
) internal pure returns (address, RecoverError) {
if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
return (address(0), RecoverError.InvalidSignatureS);
}
if (v != 27 && v != 28) {
return (address(0), RecoverError.InvalidSignatureV);
}
address signer = ecrecover(hash, v, r, s);
if (signer == address(0)) {
return (address(0), RecoverError.InvalidSignature);
}
return (signer, RecoverError.NoError);
}
function recover(
bytes32 hash,
uint8 v,
bytes32 r,
bytes32 s
) internal pure returns (address) {
(address recovered, RecoverError error) = tryRecover(hash, v, r, s);
_throwError(error);
return recovered;
}
function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
}
function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
}
}
文件 6 的 17:ERC165.sol
pragma solidity ^0.8.0;
import "./IERC165.sol";
abstract contract ERC165 is IERC165 {
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
文件 7 的 17:ERC721B.sol
pragma solidity ^0.8.0;
import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./IERC721Metadata.sol";
import "./Address.sol";
import "./Context.sol";
import "./ERC165.sol";
abstract contract ERC721B is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
string private _name;
string private _symbol;
uint internal _burned;
uint internal _offset;
address[] internal _owners;
mapping(uint => address) internal _tokenApprovals;
mapping(address => mapping(address => bool)) private _operatorApprovals;
constructor(string memory name_, string memory symbol_, uint offset) {
_name = name_;
_symbol = symbol_;
_offset = offset;
for(uint i; i < _offset; ++i ){
_owners.push(address(0));
}
}
function balanceOf(address owner) public view virtual override returns (uint) {
require(owner != address(0), "ERC721: balance query for the zero address");
uint count;
for( uint i; i < _owners.length; ++i ){
if( owner == _owners[i] )
++count;
}
return count;
}
function name() external view virtual override returns (string memory) {
return _name;
}
function ownerOf(uint tokenId) public view virtual override returns (address) {
address owner = _owners[tokenId];
require(owner != address(0), "ERC721: owner query for nonexistent token");
return owner;
}
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}
function symbol() external view virtual override returns (string memory) {
return _symbol;
}
function totalSupply() public view virtual returns (uint) {
return _owners.length - (_offset + _burned);
}
function approve(address to, uint tokenId) external virtual override {
address owner = ERC721B.ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(
_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not owner nor approved for all"
);
_approve(to, tokenId);
}
function getApproved(uint tokenId) public view virtual override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
function setApprovalForAll(address operator, bool approved) external virtual override {
require(operator != _msgSender(), "ERC721: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
function transferFrom(
address from,
address to,
uint tokenId
) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_transfer(from, to, tokenId);
}
function safeTransferFrom(
address from,
address to,
uint tokenId
) external virtual override {
safeTransferFrom(from, to, tokenId, "");
}
function safeTransferFrom(
address from,
address to,
uint tokenId,
bytes memory _data
) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_safeTransfer(from, to, tokenId, _data);
}
function _approve(address to, uint tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721B.ownerOf(tokenId), to, tokenId);
}
function _beforeTokenTransfer(
address from,
address to,
uint tokenId
) internal virtual {}
function _burn(uint tokenId) internal virtual {
address owner = ERC721B.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
_approve(address(0), tokenId);
_owners[tokenId] = address(0);
emit Transfer(owner, address(0), tokenId);
}
function _checkOnERC721Received(
address from,
address to,
uint tokenId,
bytes memory _data
) private returns (bool) {
if (to.isContract()) {
try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721Receiver.onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert("ERC721: transfer to non ERC721Receiver implementer");
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
function _exists(uint tokenId) internal view virtual returns (bool) {
return tokenId < _owners.length && _owners[tokenId] != address(0);
}
function _isApprovedOrOwner(address spender, uint tokenId) internal view virtual returns (bool) {
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ERC721B.ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}
function _mint(address to, uint tokenId) internal virtual {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_beforeTokenTransfer(address(0), to, tokenId);
_owners.push(to);
emit Transfer(address(0), to, tokenId);
}
function _next() internal view virtual returns( uint ){
return _owners.length;
}
function _safeMint(address to, uint tokenId) internal virtual {
_safeMint(to, tokenId, "");
}
function _safeMint(
address to,
uint tokenId,
bytes memory _data
) internal virtual {
_mint(to, tokenId);
require(
_checkOnERC721Received(address(0), to, tokenId, _data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}
function _safeTransfer(
address from,
address to,
uint tokenId,
bytes memory _data
) internal virtual {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
}
function _transfer(
address from,
address to,
uint tokenId
) internal virtual {
require(ERC721B.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
require(to != address(0), "ERC721: transfer to the zero address");
_beforeTokenTransfer(from, to, tokenId);
_approve(address(0), tokenId);
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
}
}
文件 8 的 17:ERC721EnumerableLite.sol
pragma solidity ^0.8.0;
import "./ERC721B.sol";
import "./IERC721Batch.sol";
import "./IERC721Enumerable.sol";
abstract contract ERC721EnumerableLite is ERC721B, IERC721Batch, IERC721Enumerable {
mapping(address => uint) internal _balances;
function isOwnerOf( address account, uint[] calldata tokenIds ) external view virtual override returns( bool ){
for(uint i; i < tokenIds.length; ++i ){
if( _owners[ tokenIds[i] ] != account )
return false;
}
return true;
}
function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721B) returns (bool) {
return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
}
function tokenOfOwnerByIndex(address owner, uint index) public view override returns (uint tokenId) {
uint count;
for( uint i; i < _owners.length; ++i ){
if( owner == _owners[i] ){
if( count == index )
return i;
else
++count;
}
}
revert("ERC721Enumerable: owner index out of bounds");
}
function tokenByIndex(uint index) external view virtual override returns (uint) {
require(index < totalSupply(), "ERC721Enumerable: global index out of bounds");
return index;
}
function totalSupply() public view virtual override( ERC721B, IERC721Enumerable ) returns (uint) {
return _owners.length - (_offset + _burned);
}
function transferBatch( address from, address to, uint[] calldata tokenIds, bytes calldata data ) external override{
for(uint i; i < tokenIds.length; ++i ){
safeTransferFrom( from, to, tokenIds[i], data );
}
}
function walletOfOwner( address account ) external view virtual override returns( uint[] memory ){
uint quantity = balanceOf( account );
uint[] memory wallet = new uint[]( quantity );
for( uint i; i < quantity; ++i ){
wallet[i] = tokenOfOwnerByIndex( account, i );
}
return wallet;
}
}
文件 9 的 17:IERC165.sol
pragma solidity ^0.8.0;
interface IERC165 {
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
文件 10 的 17:IERC721.sol
pragma solidity ^0.8.0;
import "./IERC165.sol";
interface 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) external view returns (uint256 balance);
function ownerOf(uint256 tokenId) external view returns (address owner);
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
function approve(address to, uint256 tokenId) external;
function getApproved(uint256 tokenId) external view returns (address operator);
function setApprovalForAll(address operator, bool _approved) external;
function isApprovedForAll(address owner, address operator) external view returns (bool);
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
文件 11 的 17:IERC721Batch.sol
pragma solidity ^0.8.0;
interface IERC721Batch {
function isOwnerOf( address account, uint[] calldata tokenIds ) external view returns( bool );
function transferBatch( address from, address to, uint[] calldata tokenIds, bytes calldata data ) external;
function walletOfOwner( address account ) external view returns( uint[] memory );
}
文件 12 的 17:IERC721Enumerable.sol
pragma solidity ^0.8.0;
import "./IERC721.sol";
interface IERC721Enumerable is IERC721 {
function totalSupply() external view returns (uint256);
function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
function tokenByIndex(uint256 index) external view returns (uint256);
}
文件 13 的 17:IERC721Metadata.sol
pragma solidity ^0.8.0;
import "./IERC721.sol";
interface 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);
}
文件 14 的 17:IERC721Receiver.sol
pragma solidity ^0.8.0;
interface IERC721Receiver {
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
文件 15 的 17:Ownable.sol
pragma solidity ^0.8.0;
import "./Context.sol";
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() {
_setOwner(_msgSender());
}
function owner() public view virtual returns (address) {
return _owner;
}
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
_setOwner(address(0));
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
文件 16 的 17:Signed.sol
pragma solidity ^0.8.0;
import './Delegated.sol';
import "./Strings.sol";
import "./ECDSA.sol";
contract Signed is Delegated{
using Strings for uint256;
using ECDSA for bytes32;
string private _secret;
address private _signer;
function setSecret( string calldata secret ) external onlyOwner{
_secret = secret;
}
function setSigner( address signer ) external onlyOwner{
_signer = signer;
}
function createHash( string memory data ) internal view returns ( bytes32 ){
return keccak256( abi.encodePacked( address(this), msg.sender, data, _secret ) );
}
function getSigner( bytes32 hash, bytes memory signature ) internal pure returns( address ){
return hash.toEthSignedMessageHash().recover( signature );
}
function isAuthorizedSigner( address extracted ) internal view virtual returns( bool ){
return extracted == _signer;
}
function verifySignature( string memory data, bytes calldata signature ) internal view {
address extracted = getSigner( createHash( data ), signature );
require( isAuthorizedSigner( extracted ), "Signature verification failed" );
}
}
文件 17 的 17:Strings.sol
pragma solidity ^0.8.0;
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
function toString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0x00";
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
}
{
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},
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"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
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