// SPDX-License-Identifier: MIT// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)pragmasolidity ^0.8.1;/**
* @dev Collection of functions related to the address type
*/libraryAddress{
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/functionisContract(address account) internalviewreturns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0// for contracts in construction, since the code is only stored at the end// of the constructor execution.return account.code.length>0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/functionsendValue(addresspayable 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");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/functionfunctionCall(address target, bytesmemory data) internalreturns (bytesmemory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/functionfunctionCall(address target,
bytesmemory data,
stringmemory errorMessage
) internalreturns (bytesmemory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/functionfunctionCallWithValue(address target,
bytesmemory data,
uint256 value
) internalreturns (bytesmemory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/functionfunctionCallWithValue(address target,
bytesmemory data,
uint256 value,
stringmemory errorMessage
) internalreturns (bytesmemory) {
require(address(this).balance>= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytesmemory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/functionfunctionStaticCall(address target, bytesmemory data) internalviewreturns (bytesmemory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/functionfunctionStaticCall(address target,
bytesmemory data,
stringmemory errorMessage
) internalviewreturns (bytesmemory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytesmemory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/functionfunctionDelegateCall(address target, bytesmemory data) internalreturns (bytesmemory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/functionfunctionDelegateCall(address target,
bytesmemory data,
stringmemory errorMessage
) internalreturns (bytesmemory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytesmemory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/functionverifyCallResult(bool success,
bytesmemory returndata,
stringmemory errorMessage
) internalpurereturns (bytesmemory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if presentif (returndata.length>0) {
// The easiest way to bubble the revert reason is using memory via assemblyassembly {
let returndata_size :=mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
Contract Source Code
File 2 of 14: Context.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)pragmasolidity ^0.8.0;/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/abstractcontractContext{
function_msgSender() internalviewvirtualreturns (address) {
returnmsg.sender;
}
function_msgData() internalviewvirtualreturns (bytescalldata) {
returnmsg.data;
}
}
Contract Source Code
File 3 of 14: DegenGangBeastsNFT.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.0;import"@openzeppelin/contracts/access/Ownable.sol";
import"./ERC721A.sol";
import"@openzeppelin/contracts/utils/Strings.sol";
import"@openzeppelin/contracts/utils/math/SafeMath.sol";
import"@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
interfaceIDegenGang{
functiongetTokensOfOwner(address _owner)
externalviewreturns (uint256[] memory);
}
contractDegenGangBeastsNFTisOwnable, ERC721A{
usingSafeMathforuint256;
usingSafeMathforuint8;
stringprivate _baseTokenURI;
uint256publicconstant MAX_DGB =5000;
uint256publicconstant MAX_BREED_ALLOWANCE =2;
uint256publicconstant MAX_BREED_WL =500;
uint256publicconstant MAX_BREED_WL_2 =1000;
uint256publicconstant MAX_PRESALE =1500;
uint256public MAX_PRESALE_ALLOWANCE =2;
uint256publicconstant MAX_SALE_ALLOWANCE =50;
address team1Address;
address team2Address;
address team3Address;
address degenGang;
uint256public price;
uint256public totalPresaleSupply;
bytes32public merkleRoot;
boolpublic hasBreedMintStarted =false;
boolpublic breedMintOver =false;
boolpublic hasPreSaleStarted =false;
boolpublic preSaleOver =false;
boolpublic hasSaleStarted =false;
mapping(uint256=>bool) public tokenIdToIsUsed;
mapping(address=>bool) public userToPresaleMinted;
uint256public breedWhitelistCount;
constructor(stringmemory baseURI_, bytes32 _merkleRoot)
ERC721A("DegenGangBeastsNFT", "DGB1", MAX_SALE_ALLOWANCE, MAX_DGB)
{
price =0.05ether;
team1Address =0x8d0A5BAff67AA982df20bb93d9aE38AC358BA807;
team2Address =0xd5a3383773a45dE394502092f17E9e4F50bf710A;
team3Address =0x5F058DCcffB7862566aBe44F85d409823F5ce921;
degenGang =0x45ebB5FE718F40052fB2DC2463C13717b7b72768;
_baseTokenURI = baseURI_;
merkleRoot = _merkleRoot;
}
functionbreedMint(uint8 _quantity) externalpayable{
require(numberMinted(msg.sender) ==0, "DegenGangBeastsNFT::breedMint: You have already used Breed minting.");
require(hasBreedMintStarted, "DegenGangBeastsNFT::breedMint: Breed minting hasn't started.");
require(!breedMintOver, "DegenGangBeastsNFT::breedMint: Breed minting is over, no more allowances.");
require(_quantity <= MAX_BREED_ALLOWANCE, "DegenGangBeastsNFT::breedMint: You are allowed buy 2 Beasts max.");
if (_quantity >0) {
require(
_quantity ==1 ? breedWhitelistCount <= MAX_BREED_WL_2 : true,
"DegenGangBeastsNFT::breedMint: No more Whitelist spots."
);
require(
_quantity ==2 ? breedWhitelistCount <= MAX_BREED_WL : true,
"DegenGangBeastsNFT::breedMint: No more Whitelist spots."
);
require(
msg.value>= price * _quantity,
"DegenGangBeastsNFT::breedMint: Ether value sent is below the price."
);
breedWhitelistCount = breedWhitelistCount.add(1);
}
uint256[] memory tokensOfUser = IDegenGang(degenGang).getTokensOfOwner(msg.sender);
uint256 breedQuantity;
bool isPrevId =false;
uint256 prevIdIndex;
for (uint256 i =0; i < tokensOfUser.length; i++) {
bool isUsed = tokenIdToIsUsed[tokensOfUser[i]];
if (isPrevId &&!isUsed) {
breedQuantity++;
tokenIdToIsUsed[tokensOfUser[i]] =true;
tokenIdToIsUsed[tokensOfUser[prevIdIndex]] =true;
isPrevId =false;
} elseif (!isUsed) {
isPrevId =true;
prevIdIndex = i;
}
}
require(breedQuantity >0, "DegenGangBeastsNFT::breedMint:You can't breed or mint any beast.");
_safeMint(msg.sender, breedQuantity + _quantity);
}
functionpreMint(uint _quantity, bytes32[] calldata merkleProof) externalpayable{
require(hasPreSaleStarted, "DegenGangBeastsNFT::preMint: Presale hasn't started.");
require(!preSaleOver, "DegenGangBeastsNFT::preMint: Presale is over, no more allowances.");
require(!userToPresaleMinted[msg.sender], "DegenGangBeastsNFT::preMint: A user can do only one presale mint.");
require(totalPresaleSupply < MAX_PRESALE, "DegenGangBeastsNFT::preMint: All presale tokens were minted already.");
require(_quantity >0, "DegenGangBeastsNFT::preMint: Quantity cannot be zero.");
require(_quantity <= MAX_PRESALE_ALLOWANCE, "DegenGangBeastsNFT::preMint: Quantity has to be lower or equal to MAX_PRESALE_ALLOWANCE.");
require(totalSupply() + _quantity <= MAX_DGB, "DegenGangBeastsNFT::preMint: Sold out.");
require(msg.value* _quantity >= price, "DegenGangBeastsNFT::preMint: Ether value sent is below the price.");
bytes32 node =keccak256(abi.encodePacked(msg.sender));
require(MerkleProof.verify(merkleProof, merkleRoot, node), "DegenGangBeastsNFT::preMint: Invalid merkle proof.");
_safeMint(msg.sender, _quantity);
userToPresaleMinted[msg.sender] =true;
totalPresaleSupply = totalPresaleSupply.add(_quantity);
}
functionmint(uint256 _quantity) externalpayable{
require(hasSaleStarted, "DegenGangBeastsNFT::mint: Sale hasn't started.");
require(_quantity >0, "DegenGangBeastsNFT::mint: Quantity cannot be zero.");
require(_quantity <= MAX_SALE_ALLOWANCE, "DegenGangBeastsNFT::mint: Quantity cannot be bigger than MAX_BUYING.");
require(totalSupply() + _quantity <= MAX_DGB, "DegenGangBeastsNFT::mint: Sold out.");
require(msg.value>= price * _quantity, "DegenGangBeastsNFT::mint: Ether value sent is below the price.");
_safeMint(msg.sender, _quantity);
}
functionmintByOwner(address _to, uint256 _quantity) publiconlyOwner{
require(_quantity >0, "DegenGangBeastsNFT::mintByOwner: Quantity cannot be zero.");
require(_quantity <= MAX_SALE_ALLOWANCE, "DegenGangBeastsNFT::mintByOwner: Quantity cannot be bigger than MAX_SALE.");
require(totalSupply() + _quantity <= MAX_DGB, "DegenGangBeastsNFT::mintByOwner: Sold out.");
_safeMint(_to, _quantity);
}
functionbatchMintByOwner(address[] memory _mintAddressList,
uint256[] memory _quantityList
) externalonlyOwner{
require(_mintAddressList.length== _quantityList.length, "DegenGangBeastsNFT::batchMintByOwner: The length should be same");
for (uint256 i =0; i < _mintAddressList.length; i +=1) {
mintByOwner(_mintAddressList[i], _quantityList[i]);
}
}
functionchangePreSaleAllowance(uint256 _preSaleAllowance) externalonlyOwner{
MAX_PRESALE_ALLOWANCE = _preSaleAllowance;
}
functionsetMerkleRoot(bytes32 _merkleRoot) externalonlyOwner{
merkleRoot = _merkleRoot;
}
function_baseURI() internalviewvirtualoverridereturns (stringmemory) {
return _baseTokenURI;
}
functionsetBaseURI(stringcalldata baseURI) externalonlyOwner{
_baseTokenURI = baseURI;
}
functionsetPrice(uint256 _price) externalonlyOwner{
price = _price;
}
functionstartBreedMint() externalonlyOwner{
require(!hasBreedMintStarted, "DegenGangBeastsNFT::startSale: Breed minting is already active.");
require(!breedMintOver, "DegenGangBeastsNFT::startSale: Breed minting is over, cannot start again.");
hasBreedMintStarted =true;
}
functionpauseBreedMint() externalonlyOwner{
require(hasBreedMintStarted, "DegenGangBeastsNFT::pauseSale: Breed minting is not active.");
hasBreedMintStarted =false;
}
functionstartPreSale() externalonlyOwner{
require(!preSaleOver, "DegenGangBeastsNFT::startPreSale: Presale is over, cannot start again.");
require(!hasPreSaleStarted, "DegenGangBeastsNFT::startPreSale: Presale is already active.");
require(hasBreedMintStarted || breedMintOver, "DegenGangBeastsNFT::startPreSale: Breed minting should be active first.");
hasPreSaleStarted =true;
if (!breedMintOver) {
hasBreedMintStarted =false;
breedMintOver =true;
}
}
functionpausePreSale() externalonlyOwner{
require(hasPreSaleStarted, "DegenGangBeastsNFT::pausePreSale: Presale is not active.");
hasPreSaleStarted =false;
}
functionstartSale() externalonlyOwner{
require(!hasSaleStarted, "DegenGangBeastsNFT::startSale: Sale is already active.");
require(hasPreSaleStarted || preSaleOver, "DegenGangBeastsNFT::startSale: Presale should be active first.");
hasSaleStarted =true;
if (!preSaleOver) {
hasPreSaleStarted =false;
preSaleOver =true;
}
}
functionpauseSale() externalonlyOwner{
require(hasSaleStarted, "DegenGangBeastsNFT::pauseSale: Sale is not active.");
hasSaleStarted =false;
}
functionsetTeam1Address(address _team1Address) externalonlyOwner{
team1Address = _team1Address;
}
functionsetTeam2Address(address _team2Address) externalonlyOwner{
team2Address = _team2Address;
}
functionsetTeam3Address(address _team3Address) externalonlyOwner{
team3Address = _team3Address;
}
functionnumberMinted(address owner) publicviewreturns (uint256) {
return _numberMinted(owner);
}
functiongetOwnershipData(uint256 tokenId)
externalviewreturns (TokenOwnership memory)
{
return ownershipOf(tokenId);
}
functionwithdrawETH() externalonlyOwner{
uint256 totalBalance =address(this).balance;
uint256 team3Amount = totalBalance;
uint256 team1Amount = (totalBalance *9000) /10000; // 90%uint256 team2Amount = (totalBalance *500) /10000; // 5%
team3Amount = team3Amount - team1Amount - team2Amount; // 5%
(bool withdrawTeam1, ) = team1Address.call{value: team1Amount}("");
require(withdrawTeam1, "Withdraw Failed To Team 1 address.");
(bool withdrawTeam2, ) = team2Address.call{value: team2Amount}("");
require(withdrawTeam2, "Withdraw Failed To Team 2 address.");
(bool withdrawTeam3, ) = team3Address.call{value: team3Amount}("");
require(withdrawTeam3, "Withdraw Failed To Team 3 address.");
}
}
Contract Source Code
File 4 of 14: ERC165.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)pragmasolidity ^0.8.0;import"./IERC165.sol";
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/abstractcontractERC165isIERC165{
/**
* @dev See {IERC165-supportsInterface}.
*/functionsupportsInterface(bytes4 interfaceId) publicviewvirtualoverridereturns (bool) {
return interfaceId ==type(IERC165).interfaceId;
}
}
Contract Source Code
File 5 of 14: ERC721A.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.0;import"@openzeppelin/contracts/token/ERC721/IERC721.sol";
import"@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import"@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import"@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
import"@openzeppelin/contracts/utils/Address.sol";
import"@openzeppelin/contracts/utils/Context.sol";
import"@openzeppelin/contracts/utils/Strings.sol";
import"@openzeppelin/contracts/utils/introspection/ERC165.sol";
contractERC721AisContext,
ERC165,
IERC721,
IERC721Metadata,
IERC721Enumerable{
usingAddressforaddress;
usingStringsforuint256;
structTokenOwnership {
address addr;
uint64 startTimestamp;
}
structAddressData {
uint128 balance;
uint128 numberMinted;
}
uint256private currentIndex =0;
uint256internalimmutable collectionSize;
uint256internalimmutable maxBatchSize;
// Token namestringprivate _name;
// Token symbolstringprivate _symbol;
// Mapping from token ID to ownership details// An empty struct value does not necessarily mean the token is unowned. See ownershipOf implementation for details.mapping(uint256=> TokenOwnership) private _ownerships;
// Mapping owner address to address datamapping(address=> AddressData) private _addressData;
// Mapping from token ID to approved addressmapping(uint256=>address) private _tokenApprovals;
mapping(address=>mapping(address=>bool)) private _operatorApprovals;
constructor(stringmemory name_,
stringmemory symbol_,
uint256 maxBatchSize_,
uint256 collectionSize_
) {
require(
collectionSize_ >0,
"ERC721A: collection must have a nonzero supply"
);
require(maxBatchSize_ >0, "ERC721A: max batch size must be nonzero");
_name = name_;
_symbol = symbol_;
maxBatchSize = maxBatchSize_;
collectionSize = collectionSize_;
}
functiontotalSupply() publicviewoverridereturns (uint256) {
return currentIndex;
}
functiontokenByIndex(uint256 index) publicviewoverridereturns (uint256) {
require(index < totalSupply(), "ERC721A: global index out of bounds");
return index;
}
functiontokenOfOwnerByIndex(address owner, uint256 index)
publicviewoverridereturns (uint256)
{
require(index < balanceOf(owner), "ERC721A: owner index out of bounds");
uint256 numMintedSoFar = totalSupply();
uint256 tokenIdsIdx =0;
address currOwnershipAddr =address(0);
for (uint256 i =0; i < numMintedSoFar; i++) {
TokenOwnership memory ownership = _ownerships[i];
if (ownership.addr !=address(0)) {
currOwnershipAddr = ownership.addr;
}
if (currOwnershipAddr == owner) {
if (tokenIdsIdx == index) {
return i;
}
tokenIdsIdx++;
}
}
revert("ERC721A: unable to get token of owner by index");
}
functionsupportsInterface(bytes4 interfaceId)
publicviewvirtualoverride(ERC165, IERC165)
returns (bool)
{
return
interfaceId ==type(IERC721).interfaceId||
interfaceId ==type(IERC721Metadata).interfaceId||
interfaceId ==type(IERC721Enumerable).interfaceId||super.supportsInterface(interfaceId);
}
functionbalanceOf(address owner) publicviewoverridereturns (uint256) {
require(owner !=address(0), "ERC721A: balance query for the zero address");
returnuint256(_addressData[owner].balance);
}
function_numberMinted(address owner) internalviewreturns (uint256) {
require(
owner !=address(0),
"ERC721A: number minted query for the zero address"
);
returnuint256(_addressData[owner].numberMinted);
}
functionownershipOf(uint256 tokenId)
internalviewreturns (TokenOwnership memory)
{
require(_exists(tokenId), "ERC721A: owner query for nonexistent token");
uint256 lowestTokenToCheck;
if (tokenId >= maxBatchSize) {
lowestTokenToCheck = tokenId - maxBatchSize +1;
}
for (uint256 curr = tokenId; curr >= lowestTokenToCheck; curr--) {
TokenOwnership memory ownership = _ownerships[curr];
if (ownership.addr !=address(0)) {
return ownership;
}
}
revert("ERC721A: unable to determine the owner of token");
}
functionownerOf(uint256 tokenId) publicviewoverridereturns (address) {
return ownershipOf(tokenId).addr;
}
functionname() publicviewvirtualoverridereturns (stringmemory) {
return _name;
}
functionsymbol() publicviewvirtualoverridereturns (stringmemory) {
return _symbol;
}
functiontokenURI(uint256 tokenId)
publicviewvirtualoverridereturns (stringmemory)
{
require(
_exists(tokenId),
"ERC721Metadata: URI query for nonexistent token"
);
stringmemory baseURI = _baseURI();
returnbytes(baseURI).length>0
? string(abi.encodePacked(baseURI, tokenId.toString()))
: "";
}
function_baseURI() internalviewvirtualreturns (stringmemory) {
return"";
}
functionapprove(address to, uint256 tokenId) publicoverride{
address owner = ERC721A.ownerOf(tokenId);
require(to != owner, "ERC721A: approval to current owner");
require(
_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721A: approve caller is not owner nor approved for all"
);
_approve(to, tokenId, owner);
}
functiongetApproved(uint256 tokenId) publicviewoverridereturns (address) {
require(_exists(tokenId), "ERC721A: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
functionsetApprovalForAll(address operator, bool approved) publicoverride{
require(operator != _msgSender(), "ERC721A: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
functionisApprovedForAll(address owner, address operator)
publicviewvirtualoverridereturns (bool)
{
return _operatorApprovals[owner][operator];
}
functiontransferFrom(addressfrom,
address to,
uint256 tokenId
) publicoverride{
_transfer(from, to, tokenId);
}
functionsafeTransferFrom(addressfrom,
address to,
uint256 tokenId
) publicoverride{
safeTransferFrom(from, to, tokenId, "");
}
functionsafeTransferFrom(addressfrom,
address to,
uint256 tokenId,
bytesmemory _data
) publicoverride{
_transfer(from, to, tokenId);
require(
_checkOnERC721Received(from, to, tokenId, _data),
"ERC721A: transfer to non ERC721Receiver implementer"
);
}
function_exists(uint256 tokenId) internalviewreturns (bool) {
return tokenId < currentIndex;
}
function_safeMint(address to, uint256 quantity) internal{
_safeMint(to, quantity, "");
}
function_safeMint(address to,
uint256 quantity,
bytesmemory _data
) internal{
uint256 startTokenId = currentIndex;
require(to !=address(0), "ERC721A: mint to the zero address");
// We know if the first token in the batch doesn't exist, the other ones don't as well, because of serial ordering.require(!_exists(startTokenId), "ERC721A: token already minted");
require(quantity <= maxBatchSize, "ERC721A: quantity to mint too high");
_beforeTokenTransfers(address(0), to, startTokenId, quantity);
AddressData memory addressData = _addressData[to];
_addressData[to] = AddressData(
addressData.balance+uint128(quantity),
addressData.numberMinted +uint128(quantity)
);
_ownerships[startTokenId] = TokenOwnership(to, uint64(block.timestamp));
uint256 updatedIndex = startTokenId;
for (uint256 i =0; i < quantity; i++) {
emit Transfer(address(0), to, updatedIndex);
require(
_checkOnERC721Received(address(0), to, updatedIndex, _data),
"ERC721A: transfer to non ERC721Receiver implementer"
);
updatedIndex++;
}
currentIndex = updatedIndex;
_afterTokenTransfers(address(0), to, startTokenId, quantity);
}
function_transfer(addressfrom,
address to,
uint256 tokenId
) private{
TokenOwnership memory prevOwnership = ownershipOf(tokenId);
bool isApprovedOrOwner = (_msgSender() == prevOwnership.addr ||
getApproved(tokenId) == _msgSender() ||
isApprovedForAll(prevOwnership.addr, _msgSender()));
require(
isApprovedOrOwner,
"ERC721A: transfer caller is not owner nor approved"
);
require(
prevOwnership.addr ==from,
"ERC721A: transfer from incorrect owner"
);
require(to !=address(0), "ERC721A: transfer to the zero address");
_beforeTokenTransfers(from, to, tokenId, 1);
_approve(address(0), tokenId, prevOwnership.addr);
_addressData[from].balance-=1;
_addressData[to].balance+=1;
_ownerships[tokenId] = TokenOwnership(to, uint64(block.timestamp));
uint256 nextTokenId = tokenId +1;
if (_ownerships[nextTokenId].addr ==address(0)) {
if (_exists(nextTokenId)) {
_ownerships[nextTokenId] = TokenOwnership(
prevOwnership.addr,
prevOwnership.startTimestamp
);
}
}
emit Transfer(from, to, tokenId);
_afterTokenTransfers(from, to, tokenId, 1);
}
function_approve(address to,
uint256 tokenId,
address owner
) private{
_tokenApprovals[tokenId] = to;
emit Approval(owner, to, tokenId);
}
function_checkOnERC721Received(addressfrom,
address to,
uint256 tokenId,
bytesmemory _data
) privatereturns (bool) {
if (to.isContract()) {
try
IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data)
returns (bytes4 retval) {
return retval == IERC721Receiver(to).onERC721Received.selector;
} catch (bytesmemory reason) {
if (reason.length==0) {
revert("ERC721A: transfer to non ERC721Receiver implementer");
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
returntrue;
}
}
function_beforeTokenTransfers(addressfrom,
address to,
uint256 startTokenId,
uint256 quantity
) internalvirtual{}
function_afterTokenTransfers(addressfrom,
address to,
uint256 startTokenId,
uint256 quantity
) internalvirtual{}
}
Contract Source Code
File 6 of 14: IERC165.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)pragmasolidity ^0.8.0;/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/interfaceIERC165{
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/functionsupportsInterface(bytes4 interfaceId) externalviewreturns (bool);
}
Contract Source Code
File 7 of 14: IERC721.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)pragmasolidity ^0.8.0;import"../../utils/introspection/IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/interfaceIERC721isIERC165{
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/eventTransfer(addressindexedfrom, addressindexed to, uint256indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/eventApproval(addressindexed owner, addressindexed approved, uint256indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/eventApprovalForAll(addressindexed owner, addressindexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/functionbalanceOf(address owner) externalviewreturns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/functionownerOf(uint256 tokenId) externalviewreturns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/functionsafeTransferFrom(addressfrom,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/functiontransferFrom(addressfrom,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/functionapprove(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/functiongetApproved(uint256 tokenId) externalviewreturns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/functionsetApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/functionisApprovedForAll(address owner, address operator) externalviewreturns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/functionsafeTransferFrom(addressfrom,
address to,
uint256 tokenId,
bytescalldata data
) external;
}
Contract Source Code
File 8 of 14: IERC721Enumerable.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)pragmasolidity ^0.8.0;import"../IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/interfaceIERC721EnumerableisIERC721{
/**
* @dev Returns the total amount of tokens stored by the contract.
*/functiontotalSupply() externalviewreturns (uint256);
/**
* @dev Returns a token ID owned by `owner` at a given `index` of its token list.
* Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
*/functiontokenOfOwnerByIndex(address owner, uint256 index) externalviewreturns (uint256);
/**
* @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
* Use along with {totalSupply} to enumerate all tokens.
*/functiontokenByIndex(uint256 index) externalviewreturns (uint256);
}
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)pragmasolidity ^0.8.0;/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/interfaceIERC721Receiver{
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
*/functiononERC721Received(address operator,
addressfrom,
uint256 tokenId,
bytescalldata data
) externalreturns (bytes4);
}
Contract Source Code
File 11 of 14: MerkleProof.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/MerkleProof.sol)pragmasolidity ^0.8.0;/**
* @dev These functions deal with verification of Merkle Trees proofs.
*
* The proofs can be generated using the JavaScript library
* https://github.com/miguelmota/merkletreejs[merkletreejs].
* Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
*
* See `test/utils/cryptography/MerkleProof.test.js` for some examples.
*/libraryMerkleProof{
/**
* @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
* defined by `root`. For this, a `proof` must be provided, containing
* sibling hashes on the branch from the leaf to the root of the tree. Each
* pair of leaves and each pair of pre-images are assumed to be sorted.
*/functionverify(bytes32[] memory proof,
bytes32 root,
bytes32 leaf
) internalpurereturns (bool) {
return processProof(proof, leaf) == root;
}
/**
* @dev Returns the rebuilt hash obtained by traversing a Merklee tree up
* from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
* hash matches the root of the tree. When processing the proof, the pairs
* of leafs & pre-images are assumed to be sorted.
*
* _Available since v4.4._
*/functionprocessProof(bytes32[] memory proof, bytes32 leaf) internalpurereturns (bytes32) {
bytes32 computedHash = leaf;
for (uint256 i =0; i < proof.length; i++) {
bytes32 proofElement = proof[i];
if (computedHash <= proofElement) {
// Hash(current computed hash + current element of the proof)
computedHash = _efficientHash(computedHash, proofElement);
} else {
// Hash(current element of the proof + current computed hash)
computedHash = _efficientHash(proofElement, computedHash);
}
}
return computedHash;
}
function_efficientHash(bytes32 a, bytes32 b) privatepurereturns (bytes32 value) {
assembly {
mstore(0x00, a)
mstore(0x20, b)
value :=keccak256(0x00, 0x40)
}
}
}
Contract Source Code
File 12 of 14: Ownable.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)pragmasolidity ^0.8.0;import"../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/abstractcontractOwnableisContext{
addressprivate _owner;
eventOwnershipTransferred(addressindexed previousOwner, addressindexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/functionowner() publicviewvirtualreturns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/modifieronlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/functionrenounceOwnership() publicvirtualonlyOwner{
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/functiontransferOwnership(address newOwner) publicvirtualonlyOwner{
require(newOwner !=address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/function_transferOwnership(address newOwner) internalvirtual{
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
Contract Source Code
File 13 of 14: SafeMath.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (utils/math/SafeMath.sol)pragmasolidity ^0.8.0;// CAUTION// This version of SafeMath should only be used with Solidity 0.8 or later,// because it relies on the compiler's built in overflow checks./**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
* now has built in overflow checking.
*/librarySafeMath{
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/functiontryAdd(uint256 a, uint256 b) internalpurereturns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/functiontrySub(uint256 a, uint256 b) internalpurereturns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/functiontryMul(uint256 a, uint256 b) internalpurereturns (bool, uint256) {
unchecked {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the// benefit is lost if 'b' is also tested.// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522if (a ==0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/functiontryDiv(uint256 a, uint256 b) internalpurereturns (bool, uint256) {
unchecked {
if (b ==0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/functiontryMod(uint256 a, uint256 b) internalpurereturns (bool, uint256) {
unchecked {
if (b ==0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/functionadd(uint256 a, uint256 b) internalpurereturns (uint256) {
return a + b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/functionsub(uint256 a, uint256 b) internalpurereturns (uint256) {
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/functionmul(uint256 a, uint256 b) internalpurereturns (uint256) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/functiondiv(uint256 a, uint256 b) internalpurereturns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/functionmod(uint256 a, uint256 b) internalpurereturns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/functionsub(uint256 a,
uint256 b,
stringmemory errorMessage
) internalpurereturns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/functiondiv(uint256 a,
uint256 b,
stringmemory errorMessage
) internalpurereturns (uint256) {
unchecked {
require(b >0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/functionmod(uint256 a,
uint256 b,
stringmemory errorMessage
) internalpurereturns (uint256) {
unchecked {
require(b >0, errorMessage);
return a % b;
}
}
}
Contract Source Code
File 14 of 14: Strings.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)pragmasolidity ^0.8.0;/**
* @dev String operations.
*/libraryStrings{
bytes16privateconstant _HEX_SYMBOLS ="0123456789abcdef";
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/functiontoString(uint256 value) internalpurereturns (stringmemory) {
// Inspired by OraclizeAPI's implementation - MIT licence// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.solif (value ==0) {
return"0";
}
uint256 temp = value;
uint256 digits;
while (temp !=0) {
digits++;
temp /=10;
}
bytesmemory buffer =newbytes(digits);
while (value !=0) {
digits -=1;
buffer[digits] =bytes1(uint8(48+uint256(value %10)));
value /=10;
}
returnstring(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/functiontoHexString(uint256 value) internalpurereturns (stringmemory) {
if (value ==0) {
return"0x00";
}
uint256 temp = value;
uint256 length =0;
while (temp !=0) {
length++;
temp >>=8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/functiontoHexString(uint256 value, uint256 length) internalpurereturns (stringmemory) {
bytesmemory buffer =newbytes(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");
returnstring(buffer);
}
}