// 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: 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 4 of 14: ERC721.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.7;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/utils/Context.sol";
import"@openzeppelin/contracts/utils/Strings.sol";
import"@openzeppelin/contracts/utils/introspection/ERC165.sol";
import"./Address.sol";
abstractcontractERC721isContext, ERC165, IERC721, IERC721Metadata{
usingAddressforaddress;
usingStringsforuint256;
stringprivate _name;
stringprivate _symbol;
// Mapping from token ID to owner address. An optimization that saves users gasaddress[] internal _owners;
mapping(uint256=>address) private _tokenApprovals;
mapping(address=>mapping(address=>bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/constructor(stringmemory name_, stringmemory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/functionsupportsInterface(bytes4 interfaceId)
publicviewvirtualoverride(ERC165, IERC165)
returns (bool)
{
return
interfaceId ==type(IERC721).interfaceId||
interfaceId ==type(IERC721Metadata).interfaceId||super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721-balanceOf}.
*/functionbalanceOf(address owner)
publicviewvirtualoverridereturns (uint)
{
require(owner !=address(0), "ERC721: balance query for the zero address");
uint count;
for( uint i; i < _owners.length; ++i ){
if( owner == _owners[i] )
++count;
}
return count;
}
/**
* @dev See {IERC721-ownerOf}.
*/functionownerOf(uint256 tokenId)
publicviewvirtualoverridereturns (address)
{
address owner = _owners[tokenId];
require(
owner !=address(0),
"ERC721: owner query for nonexistent token"
);
return owner;
}
/**
* @dev See {IERC721Metadata-name}.
*/functionname() publicviewvirtualoverridereturns (stringmemory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/functionsymbol() publicviewvirtualoverridereturns (stringmemory) {
return _symbol;
}
/**
* @dev See {IERC721-approve}.
*/functionapprove(address to, uint256 tokenId) publicvirtualoverride{
address owner = ERC721.ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(
_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not owner nor approved for all"
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/functiongetApproved(uint256 tokenId)
publicviewvirtualoverridereturns (address)
{
require(
_exists(tokenId),
"ERC721: approved query for nonexistent token"
);
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/functionsetApprovalForAll(address operator, bool approved)
publicvirtualoverride{
require(operator != _msgSender(), "ERC721: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/functionisApprovedForAll(address owner, address operator)
publicviewvirtualoverridereturns (bool)
{
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/functiontransferFrom(addressfrom,
address to,
uint256 tokenId
) publicvirtualoverride{
//solhint-disable-next-line max-line-lengthrequire(
_isApprovedOrOwner(_msgSender(), tokenId),
"ERC721: transfer caller is not owner nor approved"
);
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/functionsafeTransferFrom(addressfrom,
address to,
uint256 tokenId
) publicvirtualoverride{
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/functionsafeTransferFrom(addressfrom,
address to,
uint256 tokenId,
bytesmemory _data
) publicvirtualoverride{
require(
_isApprovedOrOwner(_msgSender(), tokenId),
"ERC721: transfer caller is not owner nor approved"
);
_safeTransfer(from, to, tokenId, _data);
}
/**
* @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.
*
* `_data` is additional data, it has no specified format and it is sent in call to `to`.
*
* This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/function_safeTransfer(addressfrom,
address to,
uint256 tokenId,
bytesmemory _data
) internalvirtual{
_transfer(from, to, tokenId);
require(
_checkOnERC721Received(from, to, tokenId, _data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted (`_mint`),
* and stop existing when they are burned (`_burn`).
*/function_exists(uint256 tokenId) internalviewvirtualreturns (bool) {
return tokenId < _owners.length&& _owners[tokenId] !=address(0);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/function_isApprovedOrOwner(address spender, uint256 tokenId)
internalviewvirtualreturns (bool)
{
require(
_exists(tokenId),
"ERC721: operator query for nonexistent token"
);
address owner = ERC721.ownerOf(tokenId);
return (spender == owner ||
getApproved(tokenId) == spender ||
isApprovedForAll(owner, spender));
}
/**
* @dev Safely mints `tokenId` and transfers it to `to`.
*
* Requirements:
*
* - `tokenId` must not exist.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/function_safeMint(address to, uint256 tokenId) internalvirtual{
_safeMint(to, tokenId, "");
}
/**
* @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
* forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
*/function_safeMint(address to,
uint256 tokenId,
bytesmemory _data
) internalvirtual{
_mint(to, tokenId);
require(
_checkOnERC721Received(address(0), to, tokenId, _data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}
/**
* @dev Mints `tokenId` and transfers it to `to`.
*
* WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
*
* Requirements:
*
* - `tokenId` must not exist.
* - `to` cannot be the zero address.
*
* Emits a {Transfer} event.
*/function_mint(address to, uint256 tokenId) internalvirtual{
require(to !=address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_beforeTokenTransfer(address(0), to, tokenId);
_owners.push(to);
emit Transfer(address(0), to, tokenId);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/function_burn(uint256 tokenId) internalvirtual{
address owner = ERC721.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
_owners[tokenId] =address(0);
emit Transfer(owner, address(0), tokenId);
}
/**
* @dev Transfers `tokenId` from `from` to `to`.
* As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
*
* Emits a {Transfer} event.
*/function_transfer(addressfrom,
address to,
uint256 tokenId
) internalvirtual{
require(
ERC721.ownerOf(tokenId) ==from,
"ERC721: transfer of token that is not own"
);
require(to !=address(0), "ERC721: transfer to the zero address");
_beforeTokenTransfer(from, to, tokenId);
// Clear approvals from the previous owner
_approve(address(0), tokenId);
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
}
/**
* @dev Approve `to` to operate on `tokenId`
*
* Emits a {Approval} event.
*/function_approve(address to, uint256 tokenId) internalvirtual{
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
}
/**
* @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
* The call is not executed if the target address is not a contract.
*
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/function_checkOnERC721Received(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.onERC721Received.selector;
} catch (bytesmemory reason) {
if (reason.length==0) {
revert(
"ERC721: transfer to non ERC721Receiver implementer"
);
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
returntrue;
}
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/function_beforeTokenTransfer(addressfrom,
address to,
uint256 tokenId
) internalvirtual{}
}
Contract Source Code
File 5 of 14: ERC721Enumerable.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.7;import"./ERC721.sol";
import"@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
/**
* @dev This implements an optional extension of {ERC721} defined in the EIP that adds
* enumerability of all the token ids in the contract as well as all token ids owned by each
* account but rips out the core of the gas-wasting processing that comes from OpenZeppelin.
*/abstractcontractERC721EnumerableisERC721, IERC721Enumerable{
/**
* @dev See {IERC165-supportsInterface}.
*/functionsupportsInterface(bytes4 interfaceId) publicviewvirtualoverride(IERC165, ERC721) returns (bool) {
return interfaceId ==type(IERC721Enumerable).interfaceId||super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/functiontotalSupply() publicviewvirtualoverridereturns (uint256) {
return _owners.length;
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/functiontokenByIndex(uint256 index) publicviewvirtualoverridereturns (uint256) {
require(index < _owners.length, "ERC721Enumerable: global index out of bounds");
return index;
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
*/functiontokenOfOwnerByIndex(address owner, uint256 index) publicviewvirtualoverridereturns (uint256 tokenId) {
require(index < balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
uint count;
for(uint i; i < _owners.length; i++){
if(owner == _owners[i]){
if(count == index) return i;
else count++;
}
}
revert("ERC721Enumerable: owner index out of bounds");
}
}
Contract Source Code
File 6 of 14: HappyKoalas.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.7;/*
(: @Happy_Koalas : 6,666 evolving Koalas on the Ethereum blockchain :)
developer: @BlockDaddyy (twitter)
founder: @SpartNFTs (twitter)
This contract has some unique tokenomics that **have never been done before.**
Koalas start as 2D cuties and evolve to 3D versions. Then holders will have the
option to revert their koalas back to 2D for limited times periods. I would also like
to take it to the next level with another idea TBA.
This contract is gas optimized.
Shoutout @nftchance and @squeebo_nft
https://medium.com/coinmonks/the-cannibalization-of-nfts-by-openzeppelin-by-insanely-high-gas-prices-cd2c9a7c1e7
Future iterations should inherit from ERC721a (shoutout Azuki)
(original contract requirements did not allow for 721a to be implemented
because honoraries were initially spread randomly throughout the collection
but needed to be minted to a specific address.
(721a is required to use amounts rather than indexes in important functions))
Auditor: @moonfarm_eth
*/import"@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import"@openzeppelin/contracts/access/Ownable.sol";
import"./ERC721Enumerable.sol";
contractHappyKoalasisERC721Enumerable, Ownable{
stringpublic baseURI_2D;
stringpublic baseURI_3D;
stringpublic baseExtension =".json";
eventProjectStateChanged(uintindexed newState);
addresspublic proxyRegistryAddress; // opensea proxy for no-cost approval// Opensea (wyvern): 0xa5409ec958C83C3f309868babACA7c86DCB077c1// Opensea Rinkeby: 0xf57b2c51ded3a29e6891aba85459d600256cf317bytes32public whitelistMerkleRoot =0xec28c287910698953b8023cd36742c38840e4b3225917bf1f49b7fd07408f3af;
uint256publicconstant MAX_SUPPLY =6666;
uint256publicconstant MAX_WL_MINT =2;
uint256publicconstant MAX_PER_PUBLIC_TX =10;
uint256publicconstant WLPriceInWei =0.036ether;
uint256publicconstant publicPriceInWei =0.046ether;
// a lot of profits will be poured back into the communityaddresspublic founderPayoutAddress =0xDbc80CDCD242Eb27c3832465528A8dAE34B612b3;
addresspublic developerPayoutAddress =0x4E9f7618F72F3d497f4e252eBB6a731d715e7af5; //B5addresspublic adminPayoutAddress =0x07c47A72c65ce8A37622Ea8B15765dAD60163120;
/**
* this comment is duplicated later in the contract for clarity
* projectState :
* 0 = Koalas have evolved / devolve paused / sale inactive :
* 1 = Koalas have evolved / devolve active / sale inactive :
* 2 = sale paused or inactive
* 3 = whitelist Sale
* 4 = public sale
* @dev IMPORTANT: Project State should never be kept above 1 once koalas have evolved to 3D !
* @dev IMPORTANT: make sure baseURI_3D is set before dropping state below 2 (which will reveal 3D)
* Likely Flow: 2 -> 3 -> 4 -> 2 -> 0 (3D released, devolve inactive) -> 1 -> (optional switching between 1 and 0)
*/uint8public projectState =2; // start pausedmapping(address=>bool) public projectProxy; // Lets avoid opensea approval fee! see overwritten isApprovedForAll at bottommapping(address=>uint8) public addressMintAmount; // track the amount whitelisters have mintedmapping (uint256=>bool) public tokenHasDevolved; // returns whether token has devolvedconstructor(address _proxyRegistryAddress // opensea: wyvern proxy 0xa5409ec958C83C3f309868babACA7c86DCB077c1;)
ERC721("Happy Koalas", "HAPPY KOALAS")
{
proxyRegistryAddress = _proxyRegistryAddress; // opensea wyvern
}
/**
* @dev include trailing /
*/functionsetBaseURI_2D(stringmemory _baseURI_2D) publiconlyOwner{
baseURI_2D = _baseURI_2D;
}
/**
@dev include trailing /
*/functionsetBaseURI_3D(stringmemory _baseURI_3D) publiconlyOwner{
baseURI_3D = _baseURI_3D;
}
/**
* @dev default: .json
*/functionsetBaseExtension(stringmemory _newBaseExtension) publiconlyOwner{
baseExtension = _newBaseExtension;
}
/**
* projectState :
* 0 = Koalas have evolved / devolve paused / sale inactive :
* 1 = Koalas have evolved / devolve active / sale inactive :
* 2 = sale paused or inactive
* 3 = whitelist Sale
* 4 = public sale
* @dev Project State should never be kept above 1 once koalas have evolved to 3D , unless a new set of metadata is used!
* @dev Make sure baseURI_3D is set before dropping state below 2
* Likely Flow: 2 -> 3 -> 4 -> 2 -> 0 (3D released, devolve inactive) -> 1 -> (optional switching between 1 and 0)
*/functionsetProjectState(uint8 _projectState) externalonlyOwner{
projectState = _projectState;
emit ProjectStateChanged(_projectState);
}
// reminder : team should refresh entire project's metadata for our members when we reveal and evolve to 3D/**
* Koala owner can call this function with the ID of their Koala if they want to revert it back to 2D Forever
* (warning: this can't be undone)
*/functiondevolveTo2D(uint256 _tokenId) external{
require(projectState ==1, "You can't devolve to 2D right now");
require(_owners[_tokenId] == _msgSender(), "You can't change someone else's Koala"); // This also makes sure the token existsrequire(tokenHasDevolved[_tokenId] ==false, "This token has already devolved");
tokenHasDevolved[_tokenId] =true;
}
functiontokenURI(uint256 _tokenId) publicviewoverridereturns (stringmemory) {
require(_exists(_tokenId), "Token does not exist.");
if (projectState <=1&&!tokenHasDevolved[_tokenId]){ // 3D stage of the projectreturnstring(abi.encodePacked(baseURI_3D, Strings.toString(_tokenId), baseExtension));
}
// 2D stage of the project (with option to do even cooler things after 3D)returnstring(abi.encodePacked(baseURI_2D, Strings.toString(_tokenId), baseExtension));
}
functionsetProxyRegistryAddress(address _proxyRegistryAddress) externalonlyOwner{
proxyRegistryAddress = _proxyRegistryAddress; // whitelist opensea and maybe looksrare
}
functionflipProxyState(address proxyAddress) publiconlyOwner{
projectProxy[proxyAddress] =!projectProxy[proxyAddress];
} // proxy state must be flipped on opensea wyvern to allow for no approval fee/**
* This function reserves 24 Honorary's (which will be given as gifts + a couple special raffles)
* and 30 normal koalas for more raffles, rewards, etc.
*/functionallocateHonoraryAndReserves() externalonlyOwner{
require(_owners.length==0, "Honoraries and reserves already minted.");
for(uint256 i; i <54; i++) {
_mint(0x525fc77C38020EcF09087FC69B3b07888316624C, i);
}
}
functionsetWhitelistMerkleRoot(bytes32 _whitelistMerkleRoot) externalonlyOwner{
whitelistMerkleRoot = _whitelistMerkleRoot;
}
function_verifyWL(bytes32[] memory proof, bytes32 leaf) internalviewreturns (bool) {
return MerkleProof.verify(proof, whitelistMerkleRoot, leaf);
}
functionwhitelistMint(uint8 count, bytes32[] calldata _merkleProof) externalpayable{
require(projectState >2, "Whitelist Sale is not active"); //this function can be called during public sale as well. this reduces chance of failed tx'srequire(addressMintAmount[_msgSender()] + count <= MAX_WL_MINT, "You are trying to mint more than your limit.");
require(_verifyWL(_merkleProof, keccak256(abi.encodePacked(_msgSender()))), "Invalid Merkle proof or address supplied.");
require(count * WLPriceInWei ==msg.value, "Invalid funds provided.");
uint256 totalSupply = _owners.length;
require(totalSupply + count <= MAX_SUPPLY, "Excedes max supply.");
addressMintAmount[_msgSender()] = addressMintAmount[_msgSender()] + count; // count the total they have minted. avoids transfer exploitfor(uint i; i < count; i++) {
_mint(_msgSender(), totalSupply + i); // _mint overwritten below to save gas
}
}
functionpublicMint(uint256 count) externalpayable{
uint256 totalSupply = _owners.length;
require(totalSupply + count <= MAX_SUPPLY, "Sorry, sold out!");
require(projectState ==4, "Public Sale is not active");
require(count <= MAX_PER_PUBLIC_TX, "Exceeds max per transaction.");
require(count * publicPriceInWei ==msg.value, "Invalid funds provided.");
for(uint i; i < count; i++) {
_mint(_msgSender(), totalSupply + i); //_mint overwritten below to save gas
}
}
functionsendEth(address to, uint256 amount) internal{
(bool success, ) = to.call{value: amount}("");
require(success, "Failed to send ether");
}
// TODO : triple checkfunctionwithdraw() publiconlyOwner{
uint256 balance =address(this).balance;
sendEth(founderPayoutAddress, balance *87/100);
sendEth(developerPayoutAddress, balance *12/100);
sendEth(adminPayoutAddress, balance *1/100);
}
functionwalletOfOwner(address _owner) publicviewreturns (uint256[] memory) {
uint256 tokenCount = balanceOf(_owner);
if (tokenCount ==0) returnnewuint256[](0);
uint256[] memory tokensId =newuint256[](tokenCount);
for (uint256 i; i < tokenCount; i++) {
tokensId[i] = tokenOfOwnerByIndex(_owner, i);
}
return tokensId;
}
functionbatchTransferFrom(address _from, address _to, uint256[] memory _tokenIds) public{
for (uint256 i =0; i < _tokenIds.length; i++) {
transferFrom(_from, _to, _tokenIds[i]);
}
}
functionbatchSafeTransferFrom(address _from, address _to, uint256[] memory _tokenIds, bytesmemory data_) public{
for (uint256 i =0; i < _tokenIds.length; i++) {
safeTransferFrom(_from, _to, _tokenIds[i], data_);
}
}
functionisOwnerOf(address account, uint256[] calldata _tokenIds) externalviewreturns (bool){
for(uint256 i; i < _tokenIds.length; ++i ){
if(_owners[_tokenIds[i]] != account)
returnfalse;
}
returntrue;
}
// save gas with _ownersfunction_mint(address to, uint256 tokenId) internalvirtualoverride{
_owners.push(to);
emit Transfer(address(0), to, tokenId);
}
// approve Ooensea proxy for easy tradingfunctionisApprovedForAll(address _owner, address operator) publicviewoverridereturns (bool) {
OpenSeaProxyRegistry proxyRegistry = OpenSeaProxyRegistry(proxyRegistryAddress);
if (address(proxyRegistry.proxies(_owner)) == operator || projectProxy[operator]){
returntrue;
}
returnsuper.isApprovedForAll(_owner, operator);
}
}
contractOwnableDelegateProxy{ }
contractOpenSeaProxyRegistry{
mapping(address=> OwnableDelegateProxy) public proxies;
}
Contract Source Code
File 7 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 8 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 9 of 14: IERC721Enumerable.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (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 tokenId);
/**
* @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 12 of 14: MerkleProof.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (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 =keccak256(abi.encodePacked(computedHash, proofElement));
} else {
// Hash(current element of the proof + current computed hash)
computedHash =keccak256(abi.encodePacked(proofElement, computedHash));
}
}
return computedHash;
}
}
Contract Source Code
File 13 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 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);
}
}