Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "ThreePerWallet.sol";
import "Ownable.sol";
import "ERC721.sol";
import "IERC721.sol";
import "IOpenDAO.sol";
/***************************************************************************************************
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***************************************************************************************************/
contract KaijuDAO is ERC721, ThreePerWallet, Ownable{
using Address for address;
using Strings for uint256;
address private signer;
address payable public treasury;
bool private publicGen0Sale;
bool private publicGen1Sale;
bool private preGen0Sale;
uint16 public minted;
//uint256 public constant MINT_PRICE_SOS_GEN0 = 50000000000000000000000000;
uint256 public MINT_PRICE_ETH_GEN0_PRESALE = 0.03 ether;
uint256 public MINT_PRICE_ETH_GEN0 = 0.04 ether;
uint256 public MINT_PRICE_ETH_GEN1 = 0.04 ether;
uint256 public MINT_PRICE_SOS_GEN0_PRESALE = 23000000000000000000000000;
uint256 public MINT_PRICE_SOS_GEN0 = 31000000000000000000000000;
uint256 public MINT_PRICE_SOS_GEN1 = 31000000000000000000000000;
uint256 public MAX_TOKENS_GEN0 = 10000;
uint256 public MAX_TOKENS_GEN1 = 10000;
uint256 public MAX_AIRDROPS_GEN0 = 100;
uint256 public MAX_AIRDROPS_GEN1 = 100;
uint256 public remain_airdrops_gen0 = 100;
uint256 public remain_airdrops_gen1 = 100;
uint16 public round_gen0;
uint16 public round_gen1;
address[] public power_leaders;
address[] public money_leaders;
address[] public music_leaders;
address[] public alien_leaders;
address[] public zombie_leaders;
mapping(uint256 => uint16) public traits;
uint256[] public power_list;
uint256[] public money_list;
uint256[] public music_list;
uint256[] public alien_list;
uint256[] public zombie_list;
IOpenDAO private openDAO;
uint256 private accum_eth_gen0 = 0 ether;
uint256 private accum_eth_gen1 = 0 ether;
uint256 private accum_sos_gen0 = 0;
uint256 private accum_sos_gen1 = 0;
constructor(address _openDAOAddress) ERC721("ChubbyKaijuDAO", "CKAIJU"){
openDAO = IOpenDAO(_openDAOAddress);
}
function initialize(uint256 supply0, uint256 supply1, uint256 airdrop0, uint256 airdrop1, address _signer, address payable _treasury) public onlyOwner {
openDAO.approve(address(this), 1000000000000000000000000000000);
MAX_TOKENS_GEN0=supply0;
MAX_TOKENS_GEN1=supply1;
MAX_AIRDROPS_GEN0 = airdrop0;
remain_airdrops_gen0 = MAX_AIRDROPS_GEN0;
MAX_AIRDROPS_GEN1 = airdrop1;
remain_airdrops_gen1 = MAX_AIRDROPS_GEN1;
signer = _signer;
treasury = _treasury;
}
function _setTrait(uint256 tokenId) internal {
uint256 seed = uint256(keccak256(abi.encodePacked(block.timestamp, tokenId)));
if(tokenId<MAX_TOKENS_GEN0+1){
uint16 mod = uint16(seed % 3);
traits[tokenId] = mod;
if(mod == 0 && power_list.length<uint256(MAX_TOKENS_GEN0/3)){
power_list.push(tokenId);
}else if(mod == 1 && money_list.length<uint256(MAX_TOKENS_GEN0/3)){
money_list.push(tokenId);
}else{
music_list.push(tokenId);
}
}else{
uint16 mod = uint16(seed % 2)+3;
traits[tokenId] = mod;
if(mod==3 && alien_list.length < MAX_TOKENS_GEN1/2) alien_list.push(tokenId);
else zombie_list.push(tokenId);
}
}
function airdropGEN0(address[] calldata airdropAddresses) public onlyOwner {
require(remain_airdrops_gen0-airdropAddresses.length>=0, "Too many airdrops");
for(uint256 i = 0; i < airdropAddresses.length; i++) {
minted++;
_setTrait(minted);
_mint(airdropAddresses[i], minted);
_autoTransfer();
}
remain_airdrops_gen0 -= airdropAddresses.length;
}
function airdropGEN1(address[] calldata airdropAddresses) public onlyOwner {
require(remain_airdrops_gen1-airdropAddresses.length>=0, "Too many airdrops");
for(uint256 i = 0; i < airdropAddresses.length; i++) {
minted++;
_setTrait(minted);
_mint(airdropAddresses[i], minted);
_autoTransfer();
}
remain_airdrops_gen1 -= airdropAddresses.length;
}
function preSaleETH(bytes memory signature, uint16 amount) external payable threePerWallet(msg.sender, minted+1){
require(preGen0Sale, "preSale closed");
require(isWhitelisted(msg.sender, signature), "Not Whitelisted");
require(MINT_PRICE_ETH_GEN0_PRESALE * amount == msg.value, "Invalid payment amount");
require(amount < 4, "Too many amount");
require(minted + amount <= MAX_TOKENS_GEN0-remain_airdrops_gen0, "minted out");
for(uint i=0; i<amount; i++){
minted++;
accum_eth_gen0 += MINT_PRICE_ETH_GEN0_PRESALE;
_setTrait(minted);
_mint(msg.sender, minted);
_autoTransfer();
}
}
function publicETH(uint16 amount) external payable threePerWallet(msg.sender, minted+1){
if(minted<MAX_TOKENS_GEN0){
require(publicGen0Sale, "publicGen0Sale not open");
require(MINT_PRICE_ETH_GEN0 * amount == msg.value, "Invalid payment amount");
require(minted + amount <= MAX_TOKENS_GEN0-remain_airdrops_gen0, "minted out");
}else{
require(publicGen1Sale, "publicGen1Sale not open");
require(MINT_PRICE_ETH_GEN1 * amount == msg.value, "Invalid payment amount");
require(minted + amount <= MAX_TOKENS_GEN0+MAX_TOKENS_GEN1-remain_airdrops_gen1, "minted out");
}
require(amount < 4, "Too many amount");
for(uint i=0; i<amount; i++){
minted++;
if(minted < MAX_TOKENS_GEN0+1) accum_eth_gen0 += MINT_PRICE_ETH_GEN0;
else accum_eth_gen1 += MINT_PRICE_ETH_GEN1;
_setTrait(minted);
_mint(msg.sender, minted);
_autoTransfer();
}
}
function preSaleSOS(bytes memory signature, uint16 amount) external threePerWallet(msg.sender, minted+1){
require(preGen0Sale, "preSale closed");
require(isWhitelisted(msg.sender, signature), "Not Whitelisted");
require(amount < 4, "Too many amount");
require(minted + amount <= MAX_TOKENS_GEN0-remain_airdrops_gen0, "minted out");
require(MINT_PRICE_SOS_GEN0_PRESALE * amount <= openDAO.balanceOf(msg.sender), "not enough balance");
require(MINT_PRICE_SOS_GEN0_PRESALE * amount <= openDAO.allowance(msg.sender, address(this)), "low allowance");
openDAO.transferFrom(msg.sender, address(this), MINT_PRICE_SOS_GEN0_PRESALE * amount);
for(uint i=0; i<amount; i++){
minted++;
accum_sos_gen0 += MINT_PRICE_SOS_GEN0_PRESALE;
_setTrait(minted);
_mint(msg.sender, minted);
_autoTransfer();
}
}
function publicSOS(uint16 amount) external threePerWallet(msg.sender, minted+1){
if(minted<MAX_TOKENS_GEN0){
require(publicGen0Sale, "publicGen0Sale not open");
require(minted + amount <= MAX_TOKENS_GEN0-remain_airdrops_gen0, "minted out");
require(MINT_PRICE_SOS_GEN0 * amount <= openDAO.balanceOf(msg.sender), "not enough balance");
require(MINT_PRICE_SOS_GEN0 * amount <= openDAO.allowance(msg.sender, address(this)), "low allowance");
}else{
require(publicGen1Sale, "publicGen1Sale not open");
require(minted + amount <= MAX_TOKENS_GEN0+MAX_TOKENS_GEN1-remain_airdrops_gen1, "minted out");
require(MINT_PRICE_SOS_GEN1 * amount <= openDAO.balanceOf(msg.sender), "not enough balance");
require(MINT_PRICE_SOS_GEN1 * amount <= openDAO.allowance(msg.sender, address(this)), "low allowance");
}
require(amount < 4, "Too many amount");
openDAO.transferFrom(msg.sender, address(this), MINT_PRICE_SOS_GEN0_PRESALE * amount);
for(uint i=0; i<amount; i++){
minted++;
if(minted < MAX_TOKENS_GEN0+1) accum_sos_gen0 += MINT_PRICE_SOS_GEN0;
else accum_sos_gen1 += MINT_PRICE_SOS_GEN1;
_setTrait(minted);
_mint(msg.sender, minted);
_autoTransfer();
}
}
function ownerOf(uint256 tokenId) public view override(ERC721) returns (address) {
return super.ownerOf(tokenId);
}
function contractURI() public pure returns (string memory) {
//TODO change contractURI
return "https://raw.githubusercontent.com/KaijuDAO/kaijudao/main/contracturi";
}
function tokenURI(uint256 tokenId) public view override returns (string memory) {
require(_exists(tokenId), "nonexistent token");
string memory baseURI = _baseURI();
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
}
function _baseURI() override internal pure returns (string memory) {
//TODO change baseURI
return "https://raw.githubusercontent.com/KaijuDAO/kaijudao/main/tokenuri/";
}
function _mint(address to, uint256 tokenId) internal override(ERC721, ThreePerWallet) {
ThreePerWallet._mint(to, tokenId);
}
function setLeadersGen0(address power, address money, address music) external onlyOwner {
power_leaders.push(power);
money_leaders.push(money);
music_leaders.push(music);
round_gen0++;
}
function setLeadersGen1(address alien, address zombie) external onlyOwner {
alien_leaders.push(alien);
zombie_leaders.push(zombie);
round_gen1++;
}
function getEthSignedMessageHash(bytes32 _messageHash) public pure returns (bytes32) {
/*
Signature is produced by signing a keccak256 hash with the following format:
"\x19Ethereum Signed Message\n" + len(msg) + msg
*/
return
keccak256(
abi.encodePacked("\x19Ethereum Signed Message:\n32", _messageHash)
);
}
function isWhitelisted(address user, bytes memory signature) public view returns (bool) {
bytes32 messageHash = keccak256(abi.encode(user));
bytes32 ethSignedMessageHash = getEthSignedMessageHash(messageHash);
return recoverSigner(ethSignedMessageHash, signature) == signer;
}
function recoverSigner(bytes32 _ethSignedMessageHash, bytes memory _signature) private pure returns (address) {
(bytes32 r, bytes32 s, uint8 v) = splitSignature(_signature);
return ecrecover(_ethSignedMessageHash, v, r, s);
}
function splitSignature(bytes memory sig) private pure returns (bytes32 r, bytes32 s, uint8 v) {
require(sig.length == 65, "sig invalid");
assembly {
/*
First 32 bytes stores the length of the signature
add(sig, 32) = pointer of sig + 32
effectively, skips first 32 bytes of signature
mload(p) loads next 32 bytes starting at the memory address p into memory
*/
// first 32 bytes, after the length prefix
r := mload(add(sig, 32))
// second 32 bytes
s := mload(add(sig, 64))
// final byte (first byte of the next 32 bytes)
v := byte(0, mload(add(sig, 96)))
}
// implicitly return (r, s, v)
}
function setPreGen0Sale(bool isPre) public onlyOwner {
preGen0Sale = isPre;
}
function setpublicGen0Sale(bool isPublic) public onlyOwner {
publicGen0Sale = isPublic;
}
function setpublicGen1Sale(bool isPublic) public onlyOwner {
publicGen1Sale = isPublic;
}
function setSupplyGen0(uint256 supply) public onlyOwner {
MAX_TOKENS_GEN0=supply;
}
function setSupplyGen1(uint256 supply) public onlyOwner {
MAX_TOKENS_GEN1=supply;
}
function setSigner(address _signer) public onlyOwner {
signer = _signer;
}
function setTreasury(address payable _treasury) public onlyOwner {
treasury = _treasury;
}
function setAirdropGen0(uint256 airdrop) public onlyOwner{
MAX_AIRDROPS_GEN0 = airdrop;
}
function setAirdropGen1(uint256 airdrop) public onlyOwner{
MAX_AIRDROPS_GEN1 = airdrop;
}
function setGen0SOSPrice(uint256 price) public onlyOwner{
MINT_PRICE_SOS_GEN0 = price;
}
function setGen1SOSPrice(uint256 price) public onlyOwner{
MINT_PRICE_SOS_GEN1 = price;
}
function _autoTransfer() internal {
if(minted < MAX_TOKENS_GEN0+1){
if(minted%1000 == 0){
require(address(this).balance>=accum_eth_gen0);
treasury.transfer(accum_eth_gen0/4);
openDAO.transferFrom(address(this), treasury, uint256(accum_sos_gen0/4));
accum_eth_gen0=0 ether;
accum_sos_gen0=0 ;
}
}else{
// TODO: Gen1 treasury autotransfer
if(minted%1000 == 0){
require(address(this).balance>=accum_eth_gen1);
treasury.transfer(accum_eth_gen1/4);
openDAO.transferFrom(address(this), treasury, uint256(accum_sos_gen1/4));
accum_eth_gen1=0 ether;
accum_sos_gen1=0 ;
}
}
}
function withdraw() public onlyOwner{
payable(owner()).transfer(address(this).balance);
openDAO.transferFrom(address(this), owner(), openDAO.balanceOf(address(this)));
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "ERC721.sol";
/// @author 1001.digital
/// @title An extension that enables checking that an address only holds one token.
abstract contract ThreePerWallet is ERC721 {
// Mapping owner address to token
mapping (address => uint256) private _ownedGen0;
mapping (address => uint256) private _ownedGen1;
/// Require an externally owned account to only hold one token.
/// @param wallet the address of
/// @dev Only allow one token per wallet
modifier threePerWallet(address wallet, uint256 tokenId) {
if (_isExternal(wallet)) {
if(tokenId<10001){
require(_ownedGen0[wallet] < 3, "Can only hold three tokens per wallet");
}else{
require(_ownedGen1[wallet] < 3, "Can only hold three tokens per wallet");
}
}
_;
}
/// Store `_ownedGen0` instead of `_balances`.
/// @param to the address to which to mint the token
/// @param tokenId the tokenId that should be minted
/// @dev overrides the OpenZeppelin `_mint` method to accomodate for our own balance tracker
function _mint(address to, uint256 tokenId) internal virtual override threePerWallet(to, tokenId) {
super._mint(to, tokenId);
// We add one to account for 0-index based collections
if(msg.sender==to){
if(tokenId<10001){
_ownedGen0[to] += 1;
}else{
_ownedGen1[to] += 1;
}
}
}
/*
/// Track transfers in `_ownedGen0` instead of `_balances`
/// @param from the address from which to transfer the token
/// @param to the address to which to transfer the token
/// @param tokenId the tokenId that is being transferred
/// @dev overrides the OpenZeppelin `_transfer` method to accomodate for our own balance tracker
function _transfer(address from, address to, uint256 tokenId) internal virtual override threePerWallet(to, tokenId) {
super._transfer(from, to, tokenId);
if(tokenId<10001){
_ownedGen0[from] -= 1;
// We add one to account for 0-index based collections
_ownedGen0[to] += 1;
}else{
_ownedGen1[from] -= 1;
// We add one to account for 0-index based collections
_ownedGen1[to] += 1;
}
}
*/
function _isContract(address account) internal view returns (bool) {
return _getSize(account) > 0;
}
/// Check whether an address is an external wallet.
/// @param account the address to check
/// @dev checks if the `extcodesize` of `address` is zero
/// @return true for external wallets
function _isExternal(address account) internal view returns (bool) {
return _getSize(account) == 0;
}
/// Get the size of the code of an address
/// @param account the address to check
/// @dev gets the `extcodesize` of `address`
/// @return the size of the address
function _getSize(address account) internal view returns (uint256) {
uint256 size;
assembly {
size := extcodesize(account)
}
return size;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "IERC721.sol";
import "IERC721Receiver.sol";
import "IERC721Metadata.sol";
import "Address.sol";
import "Context.sol";
import "Strings.sol";
import "ERC165.sol";
/**
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
* the Metadata extension, but not including the Enumerable extension, which is available separately as
* {ERC721Enumerable}.
*/
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
using Strings for uint256;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Mapping from token ID to owner address
mapping(uint256 => address) private _owners;
// Mapping owner address to token count
mapping(address => uint256) private _balances;
// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721-balanceOf}.
*/
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), "ERC721: balance query for the zero address");
return _balances[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
address owner = _owners[tokenId];
require(owner != address(0), "ERC721: owner query for nonexistent token");
return owner;
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
string memory baseURI = _baseURI();
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
}
/**
* @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
* token will be the concatenation of the `baseURI` and the `tokenId`. Empty
* by default, can be overriden in child contracts.
*/
function _baseURI() internal view virtual returns (string memory) {
return "";
}
/**
* @dev See {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) public virtual override {
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}.
*/
function getApproved(uint256 tokenId) public view virtual override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual override {
require(operator != _msgSender(), "ERC721: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public virtual override {
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(
address from,
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_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) internal view virtual returns (bool) {
return _owners[tokenId] != address(0);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (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) internal virtual {
_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,
bytes memory _data
) internal virtual {
_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) internal virtual {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_beforeTokenTransfer(address(0), to, tokenId);
_balances[to] += 1;
_owners[tokenId] = 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) internal virtual {
address owner = ERC721.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
_balances[owner] -= 1;
delete _owners[tokenId];
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(
address from,
address to,
uint256 tokenId
) internal virtual {
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);
_balances[from] -= 1;
_balances[to] += 1;
_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) internal virtual {
_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(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
if (to.isContract()) {
try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721Receiver.onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert("ERC721: transfer to non ERC721Receiver implementer");
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
/**
* @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(
address from,
address to,
uint256 tokenId
) internal virtual {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (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.
*/
function safeTransferFrom(
address from,
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.
*/
function transferFrom(
address from,
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.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (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.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (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.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^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}.
*/
interface IERC165 {
/**
* @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.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721Receiver {
/**
* @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`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Metadata is IERC721 {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @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
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 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].
*/
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");
}
/**
* @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._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
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._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
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._
*/
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");
}
/**
* @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._
*/
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);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
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._
*/
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);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
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._
*/
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);
}
/**
* @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._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^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.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
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);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
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);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed 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);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^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.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "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.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_setOwner(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
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.
*/
function renounceOwnership() public virtual onlyOwner {
_setOwner(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IOpenDAO {
function balanceOf(address owner) external view returns(uint256);
function transferFrom(address, address, uint256) external;
function allowance(address owner, address spender) external view returns(uint256);
function approve(address spender, uint256 amount) external returns(bool);
}