文件 1 的 15：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 15：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 3 的 15：ECDSA.sol
pragma solidity ^0.8.0;
import "../Strings.sol";
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 {
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 = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
uint8 v = uint8((uint256(vs) >> 255) + 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 toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
}
function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
}
}
文件 4 的 15：ERC721A.sol
pragma solidity ^0.8.4;
import './IERC721A.sol';
interface ERC721A__IERC721Receiver {
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
contract ERC721A is IERC721A {
struct TokenApprovalRef {
address value;
}
uint256 private constant _BITMASK_ADDRESS_DATA_ENTRY = (1 << 64) - 1;
uint256 private constant _BITPOS_NUMBER_MINTED = 64;
uint256 private constant _BITPOS_NUMBER_BURNED = 128;
uint256 private constant _BITPOS_AUX = 192;
uint256 private constant _BITMASK_AUX_COMPLEMENT = (1 << 192) - 1;
uint256 private constant _BITPOS_START_TIMESTAMP = 160;
uint256 private constant _BITMASK_BURNED = 1 << 224;
uint256 private constant _BITPOS_NEXT_INITIALIZED = 225;
uint256 private constant _BITMASK_NEXT_INITIALIZED = 1 << 225;
uint256 private constant _BITPOS_EXTRA_DATA = 232;
uint256 private constant _BITMASK_EXTRA_DATA_COMPLEMENT = (1 << 232) - 1;
uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1;
uint256 private constant _MAX_MINT_ERC2309_QUANTITY_LIMIT = 5000;
bytes32 private constant _TRANSFER_EVENT_SIGNATURE =
0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;
uint256 private _currentIndex;
uint256 private _burnCounter;
string private _name;
string private _symbol;
mapping(uint256 => uint256) private _packedOwnerships;
mapping(address => uint256) private _packedAddressData;
mapping(uint256 => TokenApprovalRef) private _tokenApprovals;
mapping(address => mapping(address => bool)) private _operatorApprovals;
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
_currentIndex = _startTokenId();
}
function _startTokenId() internal view virtual returns (uint256) {
return 0;
}
function _nextTokenId() internal view virtual returns (uint256) {
return _currentIndex;
}
function totalSupply() public view virtual override returns (uint256) {
unchecked {
return _currentIndex - _burnCounter - _startTokenId();
}
}
function _totalMinted() internal view virtual returns (uint256) {
unchecked {
return _currentIndex - _startTokenId();
}
}
function _totalBurned() internal view virtual returns (uint256) {
return _burnCounter;
}
function balanceOf(address owner) public view virtual override returns (uint256) {
if (owner == address(0)) revert BalanceQueryForZeroAddress();
return _packedAddressData[owner] & _BITMASK_ADDRESS_DATA_ENTRY;
}
function _numberMinted(address owner) internal view returns (uint256) {
return (_packedAddressData[owner] >> _BITPOS_NUMBER_MINTED) & _BITMASK_ADDRESS_DATA_ENTRY;
}
function _numberBurned(address owner) internal view returns (uint256) {
return (_packedAddressData[owner] >> _BITPOS_NUMBER_BURNED) & _BITMASK_ADDRESS_DATA_ENTRY;
}
function _getAux(address owner) internal view returns (uint64) {
return uint64(_packedAddressData[owner] >> _BITPOS_AUX);
}
function _setAux(address owner, uint64 aux) internal virtual {
uint256 packed = _packedAddressData[owner];
uint256 auxCasted;
assembly {
auxCasted := aux
}
packed = (packed & _BITMASK_AUX_COMPLEMENT) | (auxCasted << _BITPOS_AUX);
_packedAddressData[owner] = packed;
}
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return
interfaceId == 0x01ffc9a7 ||
interfaceId == 0x80ac58cd ||
interfaceId == 0x5b5e139f;
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
if (!_exists(tokenId)) revert URIQueryForNonexistentToken();
string memory baseURI = _baseURI();
return bytes(baseURI).length != 0 ? string(abi.encodePacked(baseURI, _toString(tokenId))) : '';
}
function _baseURI() internal view virtual returns (string memory) {
return '';
}
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
return address(uint160(_packedOwnershipOf(tokenId)));
}
function _ownershipOf(uint256 tokenId) internal view virtual returns (TokenOwnership memory) {
return _unpackedOwnership(_packedOwnershipOf(tokenId));
}
function _ownershipAt(uint256 index) internal view virtual returns (TokenOwnership memory) {
return _unpackedOwnership(_packedOwnerships[index]);
}
function _initializeOwnershipAt(uint256 index) internal virtual {
if (_packedOwnerships[index] == 0) {
_packedOwnerships[index] = _packedOwnershipOf(index);
}
}
function _packedOwnershipOf(uint256 tokenId) private view returns (uint256) {
uint256 curr = tokenId;
unchecked {
if (_startTokenId() <= curr)
if (curr < _currentIndex) {
uint256 packed = _packedOwnerships[curr];
if (packed & _BITMASK_BURNED == 0) {
while (packed == 0) {
packed = _packedOwnerships[--curr];
}
return packed;
}
}
}
revert OwnerQueryForNonexistentToken();
}
function _unpackedOwnership(uint256 packed) private pure returns (TokenOwnership memory ownership) {
ownership.addr = address(uint160(packed));
ownership.startTimestamp = uint64(packed >> _BITPOS_START_TIMESTAMP);
ownership.burned = packed & _BITMASK_BURNED != 0;
ownership.extraData = uint24(packed >> _BITPOS_EXTRA_DATA);
}
function _packOwnershipData(address owner, uint256 flags) private view returns (uint256 result) {
assembly {
owner := and(owner, _BITMASK_ADDRESS)
result := or(owner, or(shl(_BITPOS_START_TIMESTAMP, timestamp()), flags))
}
}
function _nextInitializedFlag(uint256 quantity) private pure returns (uint256 result) {
assembly {
result := shl(_BITPOS_NEXT_INITIALIZED, eq(quantity, 1))
}
}
function approve(address to, uint256 tokenId) public payable virtual override {
address owner = ownerOf(tokenId);
if (_msgSenderERC721A() != owner)
if (!isApprovedForAll(owner, _msgSenderERC721A())) {
revert ApprovalCallerNotOwnerNorApproved();
}
_tokenApprovals[tokenId].value = to;
emit Approval(owner, to, tokenId);
}
function getApproved(uint256 tokenId) public view virtual override returns (address) {
if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();
return _tokenApprovals[tokenId].value;
}
function setApprovalForAll(address operator, bool approved) public virtual override {
_operatorApprovals[_msgSenderERC721A()][operator] = approved;
emit ApprovalForAll(_msgSenderERC721A(), operator, approved);
}
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return
_startTokenId() <= tokenId &&
tokenId < _currentIndex &&
_packedOwnerships[tokenId] & _BITMASK_BURNED == 0;
}
function _isSenderApprovedOrOwner(
address approvedAddress,
address owner,
address msgSender
) private pure returns (bool result) {
assembly {
owner := and(owner, _BITMASK_ADDRESS)
msgSender := and(msgSender, _BITMASK_ADDRESS)
result := or(eq(msgSender, owner), eq(msgSender, approvedAddress))
}
}
function _getApprovedSlotAndAddress(uint256 tokenId)
private
view
returns (uint256 approvedAddressSlot, address approvedAddress)
{
TokenApprovalRef storage tokenApproval = _tokenApprovals[tokenId];
assembly {
approvedAddressSlot := tokenApproval.slot
approvedAddress := sload(approvedAddressSlot)
}
}
function transferFrom(
address from,
address to,
uint256 tokenId
) public payable virtual override {
uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);
if (address(uint160(prevOwnershipPacked)) != from) revert TransferFromIncorrectOwner();
(uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId);
if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))
if (!isApprovedForAll(from, _msgSenderERC721A())) revert TransferCallerNotOwnerNorApproved();
if (to == address(0)) revert TransferToZeroAddress();
_beforeTokenTransfers(from, to, tokenId, 1);
assembly {
if approvedAddress {
sstore(approvedAddressSlot, 0)
}
}
unchecked {
--_packedAddressData[from];
++_packedAddressData[to];
_packedOwnerships[tokenId] = _packOwnershipData(
to,
_BITMASK_NEXT_INITIALIZED | _nextExtraData(from, to, prevOwnershipPacked)
);
if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {
uint256 nextTokenId = tokenId + 1;
if (_packedOwnerships[nextTokenId] == 0) {
if (nextTokenId != _currentIndex) {
_packedOwnerships[nextTokenId] = prevOwnershipPacked;
}
}
}
}
emit Transfer(from, to, tokenId);
_afterTokenTransfers(from, to, tokenId, 1);
}
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public payable virtual override {
safeTransferFrom(from, to, tokenId, '');
}
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public payable virtual override {
transferFrom(from, to, tokenId);
if (to.code.length != 0)
if (!_checkContractOnERC721Received(from, to, tokenId, _data)) {
revert TransferToNonERC721ReceiverImplementer();
}
}
function _beforeTokenTransfers(
address from,
address to,
uint256 startTokenId,
uint256 quantity
) internal virtual {}
function _afterTokenTransfers(
address from,
address to,
uint256 startTokenId,
uint256 quantity
) internal virtual {}
function _checkContractOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
try ERC721A__IERC721Receiver(to).onERC721Received(_msgSenderERC721A(), from, tokenId, _data) returns (
bytes4 retval
) {
return retval == ERC721A__IERC721Receiver(to).onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert TransferToNonERC721ReceiverImplementer();
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
}
function _mint(address to, uint256 quantity) internal virtual {
uint256 startTokenId = _currentIndex;
if (quantity == 0) revert MintZeroQuantity();
_beforeTokenTransfers(address(0), to, startTokenId, quantity);
unchecked {
_packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1);
_packedOwnerships[startTokenId] = _packOwnershipData(
to,
_nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)
);
uint256 toMasked;
uint256 end = startTokenId + quantity;
assembly {
toMasked := and(to, _BITMASK_ADDRESS)
log4(
0,
0,
_TRANSFER_EVENT_SIGNATURE,
0,
toMasked,
startTokenId
)
for {
let tokenId := add(startTokenId, 1)
} iszero(eq(tokenId, end)) {
tokenId := add(tokenId, 1)
} {
log4(0, 0, _TRANSFER_EVENT_SIGNATURE, 0, toMasked, tokenId)
}
}
if (toMasked == 0) revert MintToZeroAddress();
_currentIndex = end;
}
_afterTokenTransfers(address(0), to, startTokenId, quantity);
}
function _mintERC2309(address to, uint256 quantity) internal virtual {
uint256 startTokenId = _currentIndex;
if (to == address(0)) revert MintToZeroAddress();
if (quantity == 0) revert MintZeroQuantity();
if (quantity > _MAX_MINT_ERC2309_QUANTITY_LIMIT) revert MintERC2309QuantityExceedsLimit();
_beforeTokenTransfers(address(0), to, startTokenId, quantity);
unchecked {
_packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1);
_packedOwnerships[startTokenId] = _packOwnershipData(
to,
_nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)
);
emit ConsecutiveTransfer(startTokenId, startTokenId + quantity - 1, address(0), to);
_currentIndex = startTokenId + quantity;
}
_afterTokenTransfers(address(0), to, startTokenId, quantity);
}
function _safeMint(
address to,
uint256 quantity,
bytes memory _data
) internal virtual {
_mint(to, quantity);
unchecked {
if (to.code.length != 0) {
uint256 end = _currentIndex;
uint256 index = end - quantity;
do {
if (!_checkContractOnERC721Received(address(0), to, index++, _data)) {
revert TransferToNonERC721ReceiverImplementer();
}
} while (index < end);
if (_currentIndex != end) revert();
}
}
}
function _safeMint(address to, uint256 quantity) internal virtual {
_safeMint(to, quantity, '');
}
function _burn(uint256 tokenId) internal virtual {
_burn(tokenId, false);
}
function _burn(uint256 tokenId, bool approvalCheck) internal virtual {
uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);
address from = address(uint160(prevOwnershipPacked));
(uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId);
if (approvalCheck) {
if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))
if (!isApprovedForAll(from, _msgSenderERC721A())) revert TransferCallerNotOwnerNorApproved();
}
_beforeTokenTransfers(from, address(0), tokenId, 1);
assembly {
if approvedAddress {
sstore(approvedAddressSlot, 0)
}
}
unchecked {
_packedAddressData[from] += (1 << _BITPOS_NUMBER_BURNED) - 1;
_packedOwnerships[tokenId] = _packOwnershipData(
from,
(_BITMASK_BURNED | _BITMASK_NEXT_INITIALIZED) | _nextExtraData(from, address(0), prevOwnershipPacked)
);
if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {
uint256 nextTokenId = tokenId + 1;
if (_packedOwnerships[nextTokenId] == 0) {
if (nextTokenId != _currentIndex) {
_packedOwnerships[nextTokenId] = prevOwnershipPacked;
}
}
}
}
emit Transfer(from, address(0), tokenId);
_afterTokenTransfers(from, address(0), tokenId, 1);
unchecked {
_burnCounter++;
}
}
function _setExtraDataAt(uint256 index, uint24 extraData) internal virtual {
uint256 packed = _packedOwnerships[index];
if (packed == 0) revert OwnershipNotInitializedForExtraData();
uint256 extraDataCasted;
assembly {
extraDataCasted := extraData
}
packed = (packed & _BITMASK_EXTRA_DATA_COMPLEMENT) | (extraDataCasted << _BITPOS_EXTRA_DATA);
_packedOwnerships[index] = packed;
}
function _extraData(
address from,
address to,
uint24 previousExtraData
) internal view virtual returns (uint24) {}
function _nextExtraData(
address from,
address to,
uint256 prevOwnershipPacked
) private view returns (uint256) {
uint24 extraData = uint24(prevOwnershipPacked >> _BITPOS_EXTRA_DATA);
return uint256(_extraData(from, to, extraData)) << _BITPOS_EXTRA_DATA;
}
function _msgSenderERC721A() internal view virtual returns (address) {
return msg.sender;
}
function _toString(uint256 value) internal pure virtual returns (string memory str) {
assembly {
let m := add(mload(0x40), 0xa0)
mstore(0x40, m)
str := sub(m, 0x20)
mstore(str, 0)
let end := str
for { let temp := value } 1 {} {
str := sub(str, 1)
mstore8(str, add(48, mod(temp, 10)))
temp := div(temp, 10)
if iszero(temp) { break }
}
let length := sub(end, str)
str := sub(str, 0x20)
mstore(str, length)
}
}
}
文件 5 的 15：ERC721AQueryable.sol
pragma solidity ^0.8.4;
import './IERC721AQueryable.sol';
import '../ERC721A.sol';
abstract contract ERC721AQueryable is ERC721A, IERC721AQueryable {
function explicitOwnershipOf(uint256 tokenId) public view virtual override returns (TokenOwnership memory) {
TokenOwnership memory ownership;
if (tokenId < _startTokenId() || tokenId >= _nextTokenId()) {
return ownership;
}
ownership = _ownershipAt(tokenId);
if (ownership.burned) {
return ownership;
}
return _ownershipOf(tokenId);
}
function explicitOwnershipsOf(uint256[] calldata tokenIds)
external
view
virtual
override
returns (TokenOwnership[] memory)
{
unchecked {
uint256 tokenIdsLength = tokenIds.length;
TokenOwnership[] memory ownerships = new TokenOwnership[](tokenIdsLength);
for (uint256 i; i != tokenIdsLength; ++i) {
ownerships[i] = explicitOwnershipOf(tokenIds[i]);
}
return ownerships;
}
}
function tokensOfOwnerIn(
address owner,
uint256 start,
uint256 stop
) external view virtual override returns (uint256[] memory) {
unchecked {
if (start >= stop) revert InvalidQueryRange();
uint256 tokenIdsIdx;
uint256 stopLimit = _nextTokenId();
if (start < _startTokenId()) {
start = _startTokenId();
}
if (stop > stopLimit) {
stop = stopLimit;
}
uint256 tokenIdsMaxLength = balanceOf(owner);
if (start < stop) {
uint256 rangeLength = stop - start;
if (rangeLength < tokenIdsMaxLength) {
tokenIdsMaxLength = rangeLength;
}
} else {
tokenIdsMaxLength = 0;
}
uint256[] memory tokenIds = new uint256[](tokenIdsMaxLength);
if (tokenIdsMaxLength == 0) {
return tokenIds;
}
TokenOwnership memory ownership = explicitOwnershipOf(start);
address currOwnershipAddr;
if (!ownership.burned) {
currOwnershipAddr = ownership.addr;
}
for (uint256 i = start; i != stop && tokenIdsIdx != tokenIdsMaxLength; ++i) {
ownership = _ownershipAt(i);
if (ownership.burned) {
continue;
}
if (ownership.addr != address(0)) {
currOwnershipAddr = ownership.addr;
}
if (currOwnershipAddr == owner) {
tokenIds[tokenIdsIdx++] = i;
}
}
assembly {
mstore(tokenIds, tokenIdsIdx)
}
return tokenIds;
}
}
function tokensOfOwner(address owner) external view virtual override returns (uint256[] memory) {
unchecked {
uint256 tokenIdsIdx;
address currOwnershipAddr;
uint256 tokenIdsLength = balanceOf(owner);
uint256[] memory tokenIds = new uint256[](tokenIdsLength);
TokenOwnership memory ownership;
for (uint256 i = _startTokenId(); tokenIdsIdx != tokenIdsLength; ++i) {
ownership = _ownershipAt(i);
if (ownership.burned) {
continue;
}
if (ownership.addr != address(0)) {
currOwnershipAddr = ownership.addr;
}
if (currOwnershipAddr == owner) {
tokenIds[tokenIdsIdx++] = i;
}
}
return tokenIds;
}
}
}
文件 6 的 15：ERC721M.sol
pragma solidity ^0.8.4;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import "@openzeppelin/contracts/utils/cryptography/SignatureChecker.sol";
import "erc721a/contracts/extensions/ERC721AQueryable.sol";
import "./IERC721M.sol";
contract ERC721M is IERC721M, ERC721AQueryable, Ownable, ReentrancyGuard {
using ECDSA for bytes32;
uint64 public constant MIN_STAGE_INTERVAL_SECONDS = 60;
uint64 public constant CROSSMINT_TIMESTAMP_EXPIRY_SECONDS = 300;
bool private _mintable;
string private _currentBaseURI;
uint256 private _activeStage;
uint256 private _maxMintableSupply;
uint256 private _globalWalletLimit;
string private _tokenURISuffix;
bool private _baseURIPermanent;
address private _cosigner;
address private _crossmintAddress;
MintStageInfo[] private _mintStages;
mapping(uint256 => mapping(address => uint32))
private _stageMintedCountsPerWallet;
mapping(uint256 => uint256) private _stageMintedCounts;
constructor(
string memory collectionName,
string memory collectionSymbol,
string memory tokenURISuffix,
uint256 maxMintableSupply,
uint256 globalWalletLimit,
address cosigner
) ERC721A(collectionName, collectionSymbol) {
if (globalWalletLimit > maxMintableSupply)
revert GlobalWalletLimitOverflow();
_mintable = false;
_maxMintableSupply = maxMintableSupply;
_globalWalletLimit = globalWalletLimit;
_tokenURISuffix = tokenURISuffix;
_cosigner = cosigner;
}
modifier canMint() {
if (!_mintable) revert NotMintable();
_;
}
modifier cannotMint() {
if (_mintable) revert Mintable();
_;
}
modifier hasSupply(uint256 qty) {
if (totalSupply() + qty > _maxMintableSupply) revert NoSupplyLeft();
_;
}
function getCosigner() external view override returns (address) {
return _cosigner;
}
function getCosignNonce(address minter) public view returns (uint256) {
return _numberMinted(minter);
}
function setCosigner(address cosigner) external onlyOwner {
_cosigner = cosigner;
emit SetCosigner(cosigner);
}
function getCrossmintAddress() external view override returns (address) {
return _crossmintAddress;
}
function setCrossmintAddress(address crossmintAddress) external onlyOwner {
_crossmintAddress = crossmintAddress;
emit SetCrossmintAddress(crossmintAddress);
}
function setStages(MintStageInfo[] calldata newStages) external onlyOwner {
uint256 originalSize = _mintStages.length;
for (uint256 i = 0; i < originalSize; i++) {
_mintStages.pop();
}
for (uint256 i = 0; i < newStages.length; i++) {
if (i >= 1) {
if (
newStages[i].startTimeUnixSeconds <
newStages[i - 1].endTimeUnixSeconds +
MIN_STAGE_INTERVAL_SECONDS
) {
revert InsufficientStageTimeGap();
}
}
_assertValidStartAndEndTimestamp(
newStages[i].startTimeUnixSeconds,
newStages[i].endTimeUnixSeconds
);
_mintStages.push(
MintStageInfo({
price: newStages[i].price,
walletLimit: newStages[i].walletLimit,
merkleRoot: newStages[i].merkleRoot,
maxStageSupply: newStages[i].maxStageSupply,
startTimeUnixSeconds: newStages[i].startTimeUnixSeconds,
endTimeUnixSeconds: newStages[i].endTimeUnixSeconds
})
);
emit UpdateStage(
i,
newStages[i].price,
newStages[i].walletLimit,
newStages[i].merkleRoot,
newStages[i].maxStageSupply,
newStages[i].startTimeUnixSeconds,
newStages[i].endTimeUnixSeconds
);
}
}
function getMintable() external view override returns (bool) {
return _mintable;
}
function setMintable(bool mintable) external onlyOwner {
_mintable = mintable;
emit SetMintable(mintable);
}
function getNumberStages() external view override returns (uint256) {
return _mintStages.length;
}
function getMaxMintableSupply() external view override returns (uint256) {
return _maxMintableSupply;
}
function setMaxMintableSupply(uint256 maxMintableSupply)
external
onlyOwner
{
if (maxMintableSupply > _maxMintableSupply) {
revert CannotIncreaseMaxMintableSupply();
}
_maxMintableSupply = maxMintableSupply;
emit SetMaxMintableSupply(maxMintableSupply);
}
function getGlobalWalletLimit() external view override returns (uint256) {
return _globalWalletLimit;
}
function setGlobalWalletLimit(uint256 globalWalletLimit)
external
onlyOwner
{
if (globalWalletLimit > _maxMintableSupply)
revert GlobalWalletLimitOverflow();
_globalWalletLimit = globalWalletLimit;
emit SetGlobalWalletLimit(globalWalletLimit);
}
function getActiveStage() external view override returns (uint256) {
return _activeStage;
}
function setActiveStage(uint256 activeStage) external onlyOwner {
if (activeStage >= _mintStages.length) revert InvalidStage();
_activeStage = activeStage;
emit SetActiveStage(activeStage);
}
function totalMintedByAddress(address a)
external
view
override
returns (uint256)
{
return _numberMinted(a);
}
function getStageInfo(uint256 index)
external
view
override
returns (
MintStageInfo memory,
uint32,
uint256
)
{
if (index >= _mintStages.length) {
revert("InvalidStage");
}
uint32 walletMinted = _stageMintedCountsPerWallet[index][msg.sender];
uint256 stageMinted = _stageMintedCounts[index];
return (_mintStages[index], walletMinted, stageMinted);
}
function updateStage(
uint256 index,
uint80 price,
uint32 walletLimit,
bytes32 merkleRoot,
uint24 maxStageSupply,
uint64 startTimeUnixSeconds,
uint64 endTimeUnixSeconds
) external onlyOwner {
if (index >= _mintStages.length) revert InvalidStage();
if (index >= 1) {
if (
startTimeUnixSeconds <
_mintStages[index - 1].endTimeUnixSeconds +
MIN_STAGE_INTERVAL_SECONDS
) {
revert InsufficientStageTimeGap();
}
}
_assertValidStartAndEndTimestamp(
startTimeUnixSeconds,
endTimeUnixSeconds
);
_mintStages[index].price = price;
_mintStages[index].walletLimit = walletLimit;
_mintStages[index].merkleRoot = merkleRoot;
_mintStages[index].maxStageSupply = maxStageSupply;
_mintStages[index].startTimeUnixSeconds = startTimeUnixSeconds;
_mintStages[index].endTimeUnixSeconds = endTimeUnixSeconds;
emit UpdateStage(
index,
price,
walletLimit,
merkleRoot,
maxStageSupply,
startTimeUnixSeconds,
endTimeUnixSeconds
);
}
function mint(
uint32 qty,
bytes32[] calldata proof,
uint64 timestamp,
bytes calldata signature
) external payable nonReentrant {
_mintInternal(qty, msg.sender, proof, timestamp, signature);
}
function crossmint(
uint32 qty,
address to,
bytes32[] calldata proof,
uint64 timestamp,
bytes calldata signature
) external payable nonReentrant {
if (_crossmintAddress == address(0)) revert CrossmintAddressNotSet();
if (msg.sender != _crossmintAddress) revert CrossmintOnly();
_mintInternal(qty, to, proof, timestamp, signature);
}
function _mintInternal(
uint32 qty,
address to,
bytes32[] calldata proof,
uint64 timestamp,
bytes calldata signature
) internal canMint hasSupply(qty) {
uint256 activeStage = _activeStage;
if (activeStage >= _mintStages.length) revert InvalidStage();
MintStageInfo memory stage;
if (_cosigner != address(0)) {
assertValidCosign(msg.sender, qty, timestamp, signature);
_assertValidTimestamp(timestamp);
activeStage = getActiveStageFromTimestamp(timestamp);
}
stage = _mintStages[activeStage];
if (msg.value < stage.price * qty) revert NotEnoughValue();
if (stage.maxStageSupply > 0) {
if (_stageMintedCounts[activeStage] + qty > stage.maxStageSupply)
revert StageSupplyExceeded();
}
if (_globalWalletLimit > 0) {
if (_numberMinted(to) + qty > _globalWalletLimit)
revert WalletGlobalLimitExceeded();
}
if (stage.walletLimit > 0) {
if (
_stageMintedCountsPerWallet[activeStage][to] + qty >
stage.walletLimit
) revert WalletStageLimitExceeded();
}
if (stage.merkleRoot != 0) {
if (
MerkleProof.processProof(
proof,
keccak256(abi.encodePacked(to))
) != stage.merkleRoot
) revert InvalidProof();
}
_stageMintedCountsPerWallet[activeStage][to] += qty;
_stageMintedCounts[activeStage] += qty;
_safeMint(to, qty);
}
function ownerMint(uint32 qty, address to)
external
onlyOwner
hasSupply(qty)
{
_safeMint(to, qty);
}
function withdraw() external onlyOwner {
uint256 value = address(this).balance;
(bool success, ) = msg.sender.call{value: value}("");
if (!success) revert WithdrawFailed();
emit Withdraw(value);
}
function setBaseURI(string calldata baseURI) external onlyOwner {
if (_baseURIPermanent) revert CannotUpdatePermanentBaseURI();
_currentBaseURI = baseURI;
emit SetBaseURI(baseURI);
}
function setBaseURIPermanent() external onlyOwner {
_baseURIPermanent = true;
emit PermanentBaseURI(_currentBaseURI);
}
function getTokenURISuffix()
external
view
override
returns (string memory)
{
return _tokenURISuffix;
}
function setTokenURISuffix(string calldata suffix) external onlyOwner {
_tokenURISuffix = suffix;
}
function tokenURI(uint256 tokenId)
public
view
override(ERC721A, IERC721A)
returns (string memory)
{
if (!_exists(tokenId)) revert URIQueryForNonexistentToken();
string memory baseURI = _currentBaseURI;
return
bytes(baseURI).length != 0
? string(
abi.encodePacked(
baseURI,
_toString(tokenId),
_tokenURISuffix
)
)
: "";
}
function getCosignDigest(
address minter,
uint32 qty,
uint64 timestamp
) public view returns (bytes32) {
if (_cosigner == address(0)) revert CosignerNotSet();
return
keccak256(
abi.encodePacked(
address(this),
minter,
qty,
_cosigner,
timestamp,
_chainID(),
getCosignNonce(minter)
)
).toEthSignedMessageHash();
}
function assertValidCosign(
address minter,
uint32 qty,
uint64 timestamp,
bytes memory signature
) public view override {
if (
!SignatureChecker.isValidSignatureNow(
_cosigner,
getCosignDigest(minter, qty, timestamp),
signature
)
) revert InvalidCosignSignature();
}
function getActiveStageFromTimestamp(uint64 timestamp)
public
view
override
returns (uint256)
{
for (uint256 i = 0; i < _mintStages.length; i++) {
if (
timestamp >= _mintStages[i].startTimeUnixSeconds &&
timestamp < _mintStages[i].endTimeUnixSeconds
) {
return i;
}
}
revert InvalidStage();
}
function _assertValidTimestamp(uint64 timestamp) internal view {
uint64 threshold = msg.sender == _crossmintAddress
? CROSSMINT_TIMESTAMP_EXPIRY_SECONDS
: MIN_STAGE_INTERVAL_SECONDS;
if (timestamp < block.timestamp - threshold) revert TimestampExpired();
}
function _assertValidStartAndEndTimestamp(uint64 start, uint64 end)
internal
pure
{
if (start >= end) revert InvalidStartAndEndTimestamp();
}
function _chainID() private view returns (uint256) {
uint256 chainID;
assembly {
chainID := chainid()
}
return chainID;
}
}
文件 7 的 15：IERC1271.sol
pragma solidity ^0.8.0;
interface IERC1271 {
function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
}
文件 8 的 15：IERC721A.sol
pragma solidity ^0.8.4;
interface IERC721A {
error ApprovalCallerNotOwnerNorApproved();
error ApprovalQueryForNonexistentToken();
error BalanceQueryForZeroAddress();
error MintToZeroAddress();
error MintZeroQuantity();
error OwnerQueryForNonexistentToken();
error TransferCallerNotOwnerNorApproved();
error TransferFromIncorrectOwner();
error TransferToNonERC721ReceiverImplementer();
error TransferToZeroAddress();
error URIQueryForNonexistentToken();
error MintERC2309QuantityExceedsLimit();
error OwnershipNotInitializedForExtraData();
struct TokenOwnership {
address addr;
uint64 startTimestamp;
bool burned;
uint24 extraData;
}
function totalSupply() external view returns (uint256);
function supportsInterface(bytes4 interfaceId) external view returns (bool);
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,
bytes calldata data
) external payable;
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external payable;
function transferFrom(
address from,
address to,
uint256 tokenId
) external payable;
function approve(address to, uint256 tokenId) external payable;
function setApprovalForAll(address operator, bool _approved) external;
function getApproved(uint256 tokenId) external view returns (address operator);
function isApprovedForAll(address owner, address operator) external view returns (bool);
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function tokenURI(uint256 tokenId) external view returns (string memory);
event ConsecutiveTransfer(uint256 indexed fromTokenId, uint256 toTokenId, address indexed from, address indexed to);
}
文件 9 的 15：IERC721AQueryable.sol
pragma solidity ^0.8.4;
import '../IERC721A.sol';
interface IERC721AQueryable is IERC721A {
error InvalidQueryRange();
function explicitOwnershipOf(uint256 tokenId) external view returns (TokenOwnership memory);
function explicitOwnershipsOf(uint256[] memory tokenIds) external view returns (TokenOwnership[] memory);
function tokensOfOwnerIn(
address owner,
uint256 start,
uint256 stop
) external view returns (uint256[] memory);
function tokensOfOwner(address owner) external view returns (uint256[] memory);
}
文件 10 的 15：IERC721M.sol
pragma solidity ^0.8.4;
import "erc721a/contracts/extensions/IERC721AQueryable.sol";
interface IERC721M is IERC721AQueryable {
error CannotIncreaseMaxMintableSupply();
error CannotUpdatePermanentBaseURI();
error CosignerNotSet();
error CrossmintAddressNotSet();
error CrossmintOnly();
error GlobalWalletLimitOverflow();
error InsufficientStageTimeGap();
error InvalidCosignSignature();
error InvalidProof();
error InvalidStage();
error InvalidStageArgsLength();
error InvalidStartAndEndTimestamp();
error NoSupplyLeft();
error NotEnoughValue();
error NotMintable();
error Mintable();
error StageSupplyExceeded();
error TimestampExpired();
error WalletGlobalLimitExceeded();
error WalletStageLimitExceeded();
error WithdrawFailed();
struct MintStageInfo {
uint80 price;
uint32 walletLimit;
bytes32 merkleRoot;
uint24 maxStageSupply;
uint64 startTimeUnixSeconds;
uint64 endTimeUnixSeconds;
}
event UpdateStage(
uint256 stage,
uint80 price,
uint32 walletLimit,
bytes32 merkleRoot,
uint24 maxStageSupply,
uint64 startTimeUnixSeconds,
uint64 endTimeUnixSeconds
);
event SetCosigner(address cosigner);
event SetCrossmintAddress(address crossmintAddress);
event SetMintable(bool mintable);
event SetMaxMintableSupply(uint256 maxMintableSupply);
event SetGlobalWalletLimit(uint256 globalWalletLimit);
event SetActiveStage(uint256 activeStage);
event SetBaseURI(string baseURI);
event PermanentBaseURI(string baseURI);
event Withdraw(uint256 value);
function getCosigner() external view returns (address);
function getCrossmintAddress() external view returns (address);
function getNumberStages() external view returns (uint256);
function getGlobalWalletLimit() external view returns (uint256);
function getMaxMintableSupply() external view returns (uint256);
function getMintable() external view returns (bool);
function totalMintedByAddress(address a) external view returns (uint256);
function getTokenURISuffix() external view returns (string memory);
function getStageInfo(uint256 index)
external
view
returns (
MintStageInfo memory,
uint32,
uint256
);
function getActiveStage() external view returns (uint256);
function getActiveStageFromTimestamp(uint64 timestamp)
external
view
returns (uint256);
function assertValidCosign(
address minter,
uint32 qty,
uint64 timestamp,
bytes memory signature
) external view;
}
文件 11 的 15：MerkleProof.sol
pragma solidity ^0.8.0;
library MerkleProof {
function verify(
bytes32[] memory proof,
bytes32 root,
bytes32 leaf
) internal pure returns (bool) {
return processProof(proof, leaf) == root;
}
function verifyCalldata(
bytes32[] calldata proof,
bytes32 root,
bytes32 leaf
) internal pure returns (bool) {
return processProofCalldata(proof, leaf) == root;
}
function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
bytes32 computedHash = leaf;
for (uint256 i = 0; i < proof.length; i++) {
computedHash = _hashPair(computedHash, proof[i]);
}
return computedHash;
}
function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
bytes32 computedHash = leaf;
for (uint256 i = 0; i < proof.length; i++) {
computedHash = _hashPair(computedHash, proof[i]);
}
return computedHash;
}
function multiProofVerify(
bytes32[] memory proof,
bool[] memory proofFlags,
bytes32 root,
bytes32[] memory leaves
) internal pure returns (bool) {
return processMultiProof(proof, proofFlags, leaves) == root;
}
function multiProofVerifyCalldata(
bytes32[] calldata proof,
bool[] calldata proofFlags,
bytes32 root,
bytes32[] memory leaves
) internal pure returns (bool) {
return processMultiProofCalldata(proof, proofFlags, leaves) == root;
}
function processMultiProof(
bytes32[] memory proof,
bool[] memory proofFlags,
bytes32[] memory leaves
) internal pure returns (bytes32 merkleRoot) {
uint256 leavesLen = leaves.length;
uint256 totalHashes = proofFlags.length;
require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");
bytes32[] memory hashes = new bytes32[](totalHashes);
uint256 leafPos = 0;
uint256 hashPos = 0;
uint256 proofPos = 0;
for (uint256 i = 0; i < totalHashes; i++) {
bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++];
hashes[i] = _hashPair(a, b);
}
if (totalHashes > 0) {
return hashes[totalHashes - 1];
} else if (leavesLen > 0) {
return leaves[0];
} else {
return proof[0];
}
}
function processMultiProofCalldata(
bytes32[] calldata proof,
bool[] calldata proofFlags,
bytes32[] memory leaves
) internal pure returns (bytes32 merkleRoot) {
uint256 leavesLen = leaves.length;
uint256 totalHashes = proofFlags.length;
require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");
bytes32[] memory hashes = new bytes32[](totalHashes);
uint256 leafPos = 0;
uint256 hashPos = 0;
uint256 proofPos = 0;
for (uint256 i = 0; i < totalHashes; i++) {
bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++];
hashes[i] = _hashPair(a, b);
}
if (totalHashes > 0) {
return hashes[totalHashes - 1];
} else if (leavesLen > 0) {
return leaves[0];
} else {
return proof[0];
}
}
function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
}
function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
assembly {
mstore(0x00, a)
mstore(0x20, b)
value := keccak256(0x00, 0x40)
}
}
}
文件 12 的 15：Ownable.sol
pragma solidity ^0.8.0;
import "../utils/Context.sol";
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() {
_transferOwnership(_msgSender());
}
modifier onlyOwner() {
_checkOwner();
_;
}
function owner() public view virtual returns (address) {
return _owner;
}
function _checkOwner() internal view virtual {
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 15：ReentrancyGuard.sol
pragma solidity ^0.8.0;
abstract contract ReentrancyGuard {
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
modifier nonReentrant() {
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
_status = _ENTERED;
_;
_status = _NOT_ENTERED;
}
}
文件 14 的 15：SignatureChecker.sol
pragma solidity ^0.8.0;
import "./ECDSA.sol";
import "../Address.sol";
import "../../interfaces/IERC1271.sol";
library SignatureChecker {
function isValidSignatureNow(
address signer,
bytes32 hash,
bytes memory signature
) internal view returns (bool) {
(address recovered, ECDSA.RecoverError error) = ECDSA.tryRecover(hash, signature);
if (error == ECDSA.RecoverError.NoError && recovered == signer) {
return true;
}
(bool success, bytes memory result) = signer.staticcall(
abi.encodeWithSelector(IERC1271.isValidSignature.selector, hash, signature)
);
return (success &&
result.length == 32 &&
abi.decode(result, (bytes32)) == bytes32(IERC1271.isValidSignature.selector));
}
}
文件 15 的 15：Strings.sol
pragma solidity ^0.8.0;
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
uint8 private constant _ADDRESS_LENGTH = 20;
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);
}
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
}
}
{
"compilationTarget": {
"contracts/ERC721M.sol": "ERC721M"
},
"evmVersion": "london",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
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