文件 1 的 13：Address.sol
pragma solidity ^0.8.1;
library Address {
function isContract(address account) internal view returns (bool) {
return account.code.length > 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 13：Base64.sol
pragma solidity ^0.8.0;
library Base64 {
bytes internal constant TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
function encode(bytes memory data) internal pure returns (string memory) {
uint256 len = data.length;
if (len == 0) return "";
uint256 encodedLen = 4 * ((len + 2) / 3);
bytes memory result = new bytes(encodedLen + 32);
bytes memory table = TABLE;
assembly {
let tablePtr := add(table, 1)
let resultPtr := add(result, 32)
for {
let i := 0
} lt(i, len) {
} {
i := add(i, 3)
let input := and(mload(add(data, i)), 0xffffff)
let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))
out := shl(8, out)
out := add(
out,
and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF)
)
out := shl(8, out)
out := add(
out,
and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF)
)
out := shl(8, out)
out := add(
out,
and(mload(add(tablePtr, and(input, 0x3F))), 0xFF)
)
out := shl(224, out)
mstore(resultPtr, out)
resultPtr := add(resultPtr, 4)
}
switch mod(len, 3)
case 1 {
mstore(sub(resultPtr, 2), shl(240, 0x3d3d))
}
case 2 {
mstore(sub(resultPtr, 1), shl(248, 0x3d))
}
mstore(result, encodedLen)
}
return string(result);
}
}文件 3 的 13：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 13：ERC1155.sol
pragma solidity ^0.8.0;
import "./IERC1155.sol";
import "./IERC1155Receiver.sol";
import "./IERC1155MetadataURI.sol";
import "./Address.sol";
import "./Context.sol";
import "./ERC165.sol";
contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
using Address for address;
mapping(uint256 => mapping(address => uint256)) private _balances;
mapping(address => mapping(address => bool)) private _operatorApprovals;
string private _uri;
constructor(string memory uri_) {
_setURI(uri_);
}
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return
interfaceId == type(IERC1155).interfaceId ||
interfaceId == type(IERC1155MetadataURI).interfaceId ||
super.supportsInterface(interfaceId);
}
function uri(uint256) public view virtual override returns (string memory) {
return _uri;
}
function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
require(account != address(0), "ERC1155: balance query for the zero address");
return _balances[id][account];
}
function balanceOfBatch(address[] memory accounts, uint256[] memory ids)
public
view
virtual
override
returns (uint256[] memory)
{
require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch");
uint256[] memory batchBalances = new uint256[](accounts.length);
for (uint256 i = 0; i < accounts.length; ++i) {
batchBalances[i] = balanceOf(accounts[i], ids[i]);
}
return batchBalances;
}
function setApprovalForAll(address operator, bool approved) public virtual override {
_setApprovalForAll(_msgSender(), operator, approved);
}
function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {
return _operatorApprovals[account][operator];
}
function safeTransferFrom(
address from,
address to,
uint256 id,
uint256 amount,
bytes memory data
) public virtual override {
require(
from == _msgSender() || isApprovedForAll(from, _msgSender()),
"ERC1155: caller is not owner nor approved"
);
_safeTransferFrom(from, to, id, amount, data);
}
function safeBatchTransferFrom(
address from,
address to,
uint256[] memory ids,
uint256[] memory amounts,
bytes memory data
) public virtual override {
require(
from == _msgSender() || isApprovedForAll(from, _msgSender()),
"ERC1155: transfer caller is not owner nor approved"
);
_safeBatchTransferFrom(from, to, ids, amounts, data);
}
function _safeTransferFrom(
address from,
address to,
uint256 id,
uint256 amount,
bytes memory data
) internal virtual {
require(to != address(0), "ERC1155: transfer to the zero address");
address operator = _msgSender();
_beforeTokenTransfer(operator, from, to, _asSingletonArray(id), _asSingletonArray(amount), data);
uint256 fromBalance = _balances[id][from];
require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
unchecked {
_balances[id][from] = fromBalance - amount;
}
_balances[id][to] += amount;
emit TransferSingle(operator, from, to, id, amount);
_doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);
}
function _safeBatchTransferFrom(
address from,
address to,
uint256[] memory ids,
uint256[] memory amounts,
bytes memory data
) internal virtual {
require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
require(to != address(0), "ERC1155: transfer to the zero address");
address operator = _msgSender();
_beforeTokenTransfer(operator, from, to, ids, amounts, data);
for (uint256 i = 0; i < ids.length; ++i) {
uint256 id = ids[i];
uint256 amount = amounts[i];
uint256 fromBalance = _balances[id][from];
require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
unchecked {
_balances[id][from] = fromBalance - amount;
}
_balances[id][to] += amount;
}
emit TransferBatch(operator, from, to, ids, amounts);
_doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data);
}
function _setURI(string memory newuri) internal virtual {
_uri = newuri;
}
function _mint(
address to,
uint256 id,
uint256 amount,
bytes memory data
) internal virtual {
require(to != address(0), "ERC1155: mint to the zero address");
address operator = _msgSender();
_beforeTokenTransfer(operator, address(0), to, _asSingletonArray(id), _asSingletonArray(amount), data);
_balances[id][to] += amount;
emit TransferSingle(operator, address(0), to, id, amount);
_doSafeTransferAcceptanceCheck(operator, address(0), to, id, amount, data);
}
function _mintBatch(
address to,
uint256[] memory ids,
uint256[] memory amounts,
bytes memory data
) internal virtual {
require(to != address(0), "ERC1155: mint to the zero address");
require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
address operator = _msgSender();
_beforeTokenTransfer(operator, address(0), to, ids, amounts, data);
for (uint256 i = 0; i < ids.length; i++) {
_balances[ids[i]][to] += amounts[i];
}
emit TransferBatch(operator, address(0), to, ids, amounts);
_doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data);
}
function _burn(
address from,
uint256 id,
uint256 amount
) internal virtual {
require(from != address(0), "ERC1155: burn from the zero address");
address operator = _msgSender();
_beforeTokenTransfer(operator, from, address(0), _asSingletonArray(id), _asSingletonArray(amount), "");
uint256 fromBalance = _balances[id][from];
require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
unchecked {
_balances[id][from] = fromBalance - amount;
}
emit TransferSingle(operator, from, address(0), id, amount);
}
function _burnBatch(
address from,
uint256[] memory ids,
uint256[] memory amounts
) internal virtual {
require(from != address(0), "ERC1155: burn from the zero address");
require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
address operator = _msgSender();
_beforeTokenTransfer(operator, from, address(0), ids, amounts, "");
for (uint256 i = 0; i < ids.length; i++) {
uint256 id = ids[i];
uint256 amount = amounts[i];
uint256 fromBalance = _balances[id][from];
require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
unchecked {
_balances[id][from] = fromBalance - amount;
}
}
emit TransferBatch(operator, from, address(0), ids, amounts);
}
function _setApprovalForAll(
address owner,
address operator,
bool approved
) internal virtual {
require(owner != operator, "ERC1155: setting approval status for self");
_operatorApprovals[owner][operator] = approved;
emit ApprovalForAll(owner, operator, approved);
}
function _beforeTokenTransfer(
address operator,
address from,
address to,
uint256[] memory ids,
uint256[] memory amounts,
bytes memory data
) internal virtual {}
function _doSafeTransferAcceptanceCheck(
address operator,
address from,
address to,
uint256 id,
uint256 amount,
bytes memory data
) private {
if (to.isContract()) {
try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
if (response != IERC1155Receiver.onERC1155Received.selector) {
revert("ERC1155: ERC1155Receiver rejected tokens");
}
} catch Error(string memory reason) {
revert(reason);
} catch {
revert("ERC1155: transfer to non ERC1155Receiver implementer");
}
}
}
function _doSafeBatchTransferAcceptanceCheck(
address operator,
address from,
address to,
uint256[] memory ids,
uint256[] memory amounts,
bytes memory data
) private {
if (to.isContract()) {
try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (
bytes4 response
) {
if (response != IERC1155Receiver.onERC1155BatchReceived.selector) {
revert("ERC1155: ERC1155Receiver rejected tokens");
}
} catch Error(string memory reason) {
revert(reason);
} catch {
revert("ERC1155: transfer to non ERC1155Receiver implementer");
}
}
}
function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) {
uint256[] memory array = new uint256[](1);
array[0] = element;
return array;
}
}
文件 5 的 13：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 6 的 13：FiveDegrees.sol
pragma solidity >= 0.8.0;
import "./ERC1155.sol";
import "./Ownable.sol";
import "./Base64.sol";
import "./Strings.sol";
import "./IPayProxy.sol";
contract FiveDegrees is ERC1155, Ownable {
using Strings for uint256;
struct TokenURIInfo {
string name;
string image;
uint256 maxSupply;
string properties;
}
mapping(uint256 => TokenURIInfo) private _uri;
mapping(uint256 => uint256) private _tokenSupply;
mapping(uint256 => uint256) private _totalBalance;
uint256 private _max_supply = 8195;
address public PAY_PROXY;
event Mint(address indexed account, address indexed owner, uint256 tokenId);
event MintBatch(address[] indexed accounts, address indexed owner, uint256[] tokenIds);
event Burn(address indexed account, address indexed owner, uint256 tokenId);
event BurnBatch(address[] indexed accounts, address indexed owner, uint256[] tokenIds);
constructor() ERC1155("") Ownable() public {
uint256 tokenId = uint256(uint160(address(this)));
_uri[tokenId].maxSupply = 2022;
}
function setProtocolInfo(string memory name, string memory image, string memory properties) public onlyOwner {
uint256 tokenId = uint256(uint160(address(this)));
_uri[tokenId].name = name;
_uri[tokenId].image = image;
_uri[tokenId].properties = properties;
emit URI(uri(tokenId), tokenId);
}
function uri(uint256 tokenId) public view virtual override returns (string memory) {
TokenURIInfo memory info = _uri[tokenId];
if (info.maxSupply == 0) {
info.maxSupply = _max_supply;
}
uint256 followers = _tokenSupply[tokenId];
uint256 followings = _totalBalance[tokenId];
string memory json = Base64.encode(
bytes(
string(
abi.encodePacked(
'{ "name": "',
info.name,
'", ',
'"image": "',
info.image,
'", ',
'"maxSupply": "',
info.maxSupply.toString(),
'", ',
'"tokenSupply": "',
followers.toString(),
'", ',
'"totalBalance": "',
followings.toString(),
'", ',
'"properties": "',
info.properties,
'" }'
)
)
)
);
return string(abi.encodePacked("data:application/json;base64,", json));
}
function baseInfo(address account) public view returns (string memory name, string memory image) {
TokenURIInfo memory info = _uri[uint256(uint160(account))];
name = info.name;
image = info.image;
}
function metrics(address account) public view virtual returns (uint256 tokenSupply, uint256 totalBalance) {
tokenSupply = _tokenSupply[uint256(uint160(account))];
totalBalance = _totalBalance[uint256(uint160(account))];
}
function setPayProxy(address proxy) public onlyOwner {
PAY_PROXY = proxy;
}
function setInfo(string memory name, string memory image, string memory properties) public {
uint256 tokenId = uint256(uint160(msg.sender));
_uri[tokenId].name = name;
_uri[tokenId].image = image;
_uri[tokenId].properties = properties;
emit URI(uri(tokenId), tokenId);
}
function increaseMaxSupply(uint256 newMax) public payable {
uint256 tokenId = uint256(uint160(msg.sender));
TokenURIInfo memory info = _uri[tokenId];
if (info.maxSupply == 0) {
info.maxSupply = _max_supply;
}
uint256 theMax = info.maxSupply;
require(theMax < newMax, "5Degrees: support increase only");
if (PAY_PROXY != address(0)) {
(address token, address receiver, uint256 amount) = IPayProxy(PAY_PROXY).queryPay(msg.sender, newMax, theMax);
if (amount > 0) {
if (token == address(0)) {
require(msg.value >= amount, "5Degrees: invalid msg.value");
payable(receiver).transfer(msg.value);
} else {
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, msg.sender, receiver, amount));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'transfer_from_failed');
}
}
}
_uri[tokenId].maxSupply = newMax;
emit URI(uri(tokenId), tokenId);
}
function decreaseMaxSupply(uint256 newMax) public {
uint256 tokenId = uint256(uint160(msg.sender));
TokenURIInfo memory info = _uri[tokenId];
if (info.maxSupply == 0) {
info.maxSupply = _max_supply;
}
require(newMax >= _tokenSupply[tokenId], "5Degrees: must be larger than the supply");
require(info.maxSupply > newMax, "5Degrees: support decrease only");
_uri[tokenId].maxSupply = newMax;
emit URI(uri(tokenId), tokenId);
}
function mint(address account) public {
address operator = msg.sender;
_internal_mint(account, operator);
}
function mintByOrigin(address account) public {
address operator = tx.origin;
_internal_mint(account, operator);
}
function _internal_mint(address account, address operator) internal {
uint256 tokenId = uint256(uint160(account));
require(operator != account, "5Degrees: cannot mint your own NFT");
require(super.balanceOf(operator, tokenId) == 0, "5Degrees: already minted");
if (_uri[tokenId].maxSupply == 0) {
_uri[tokenId].maxSupply = _max_supply;
} else {
require(_tokenSupply[tokenId] + 1 <= _uri[tokenId].maxSupply, "5Degrees: larger than max supply");
}
_mint(operator, tokenId, 1, "");
_totalBalance[uint256(uint160(operator))] += 1;
_tokenSupply[tokenId] += 1;
emit Mint(account, operator, tokenId);
}
function mintBatch(address[] memory accounts) public {
address operator = msg.sender;
_internal_mintBatch(operator, accounts);
}
function mintBatchByOrigin(address[] memory accounts) public {
address operator = tx.origin;
_internal_mintBatch(operator, accounts);
}
function _internal_mintBatch(address operator, address[] memory accounts) internal {
uint256[] memory ids = new uint256[](accounts.length);
uint256[] memory amounts = new uint256[](accounts.length);
for (uint256 i; i < accounts.length; i++) {
uint256 tokenId = uint256(uint160(accounts[i]));
if (operator == accounts[i] || super.balanceOf(operator, tokenId) > 0 || _tokenSupply[tokenId] + 1 > _uri[tokenId].maxSupply) {
continue;
}
if (_uri[tokenId].maxSupply == 0) {
_uri[tokenId].maxSupply = _max_supply;
}
_totalBalance[uint256(uint160(operator))] += 1;
_tokenSupply[tokenId] += 1;
ids[i] = tokenId;
amounts[i] = 1;
}
_mintBatch(operator, ids, amounts, "");
emit MintBatch(accounts, operator, ids);
}
function burn(address account) public {
address operator = msg.sender;
_internal_burn(account, operator);
}
function burnOrigin(address account) public {
address operator = tx.origin;
_internal_burn(account, operator);
}
function _internal_burn(address account, address operator) internal {
uint256 tokenId = uint256(uint160(account));
require(super.balanceOf(operator, tokenId) > 0, "5Degrees: token not existed");
_burn(operator, tokenId, 1);
_totalBalance[uint256(uint160(operator))] -= 1;
_tokenSupply[tokenId] -= 1;
emit Burn(account, operator, tokenId);
}
function burnBatch(address[] memory accounts) public {
address operator = msg.sender;
_internal_brunBatch(operator, accounts);
}
function burnBatchByOrigin(address[] memory accounts) public {
address operator = tx.origin;
_internal_brunBatch(operator, accounts);
}
function _internal_brunBatch(address operator, address[] memory accounts) internal {
uint256[] memory ids = new uint256[](accounts.length);
uint256[] memory amounts = new uint256[](accounts.length);
for (uint256 i; i < accounts.length; i++) {
uint256 tokenId = uint256(uint160(accounts[i]));
if (super.balanceOf(operator, tokenId) == 0) {
continue;
}
_totalBalance[uint256(uint160(operator))] -= 1;
_tokenSupply[tokenId] -= 1;
ids[i] = tokenId;
amounts[i] = 1;
}
_burnBatch(operator, ids, amounts);
emit BurnBatch(accounts, operator, ids);
}
function safeTransferFrom(
address from,
address to,
uint256 id,
uint256 amount,
bytes calldata data
) public override {
require(super.balanceOf(to, id) == 0, "5Degrees: already minted");
require(super.balanceOf(to, uint256(uint160(msg.sender))) > 0, "5Degrees: receiver hasn't minted sender's NFT");
super.safeTransferFrom(from, to, id, amount, data);
_totalBalance[uint256(uint160(from))] -= amount;
_totalBalance[uint256(uint160(to))] += amount;
}
function safeBatchTransferFrom(
address from,
address to,
uint256[] calldata ids,
uint256[] calldata amounts,
bytes calldata data
) public override {
require(ids.length == amounts.length, "5Degrees: length of ids and amounts mismatch");
uint256 amount = 0;
for (uint256 i = 0; i < ids.length; i++) {
require(super.balanceOf(to, ids[i]) == 0, "5Degrees: already minted");
amount += amounts[i];
}
require(super.balanceOf(to, uint256(uint160(msg.sender))) > 0, "5Degrees: receiver hasn't minted sender's NFT");
super.safeBatchTransferFrom(from, to, ids, amounts, data);
_totalBalance[uint256(uint160(from))] -= amount;
_totalBalance[uint256(uint160(to))] += amount;
}
function toString(bytes memory data) private pure returns (string memory) {
bytes memory alphabet = "0123456789abcdef";
bytes memory str = new bytes(2 + data.length * 2);
str[0] = "0";
str[1] = "x";
for (uint i = 0; i < data.length; i++) {
str[2 + i * 2] = alphabet[uint(uint8(data[i] >> 4))];
str[3 + i * 2] = alphabet[uint(uint8(data[i] & 0x0f))];
}
return string(str);
}
}
文件 7 的 13：IERC1155.sol
pragma solidity ^0.8.0;
import "./IERC165.sol";
interface IERC1155 is IERC165 {
event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);
event TransferBatch(
address indexed operator,
address indexed from,
address indexed to,
uint256[] ids,
uint256[] values
);
event ApprovalForAll(address indexed account, address indexed operator, bool approved);
event URI(string value, uint256 indexed id);
function balanceOf(address account, uint256 id) external view returns (uint256);
function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
external
view
returns (uint256[] memory);
function setApprovalForAll(address operator, bool approved) external;
function isApprovedForAll(address account, address operator) external view returns (bool);
function safeTransferFrom(
address from,
address to,
uint256 id,
uint256 amount,
bytes calldata data
) external;
function safeBatchTransferFrom(
address from,
address to,
uint256[] calldata ids,
uint256[] calldata amounts,
bytes calldata data
) external;
}
文件 8 的 13：IERC1155MetadataURI.sol
pragma solidity ^0.8.0;
import "./IERC1155.sol";
interface IERC1155MetadataURI is IERC1155 {
function uri(uint256 id) external view returns (string memory);
}
文件 9 的 13：IERC1155Receiver.sol
pragma solidity ^0.8.0;
import "./IERC165.sol";
interface IERC1155Receiver is IERC165 {
function onERC1155Received(
address operator,
address from,
uint256 id,
uint256 value,
bytes calldata data
) external returns (bytes4);
function onERC1155BatchReceived(
address operator,
address from,
uint256[] calldata ids,
uint256[] calldata values,
bytes calldata data
) external returns (bytes4);
}
文件 10 的 13：IERC165.sol
pragma solidity ^0.8.0;
interface IERC165 {
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
文件 11 的 13：IPayProxy.sol
pragma solidity >= 0.8.0;
interface IPayProxy {
function queryPay(address account, uint256 newMax, uint256 theMax) view external returns (address token, address receiver, uint amount);
}
文件 12 的 13：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() {
_transferOwnership(_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 {
_transferOwnership(address(0));
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
文件 13 的 13：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);
}
}{
"compilationTarget": {
"FiveDegrees.sol": "FiveDegrees"
},
"evmVersion": "london",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
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