Contract Name:
CoolKidsNextGen
Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;
import "Strings.sol";
import "ERC721Enum.sol";
// _____ _ _ ___ _ _ _ _ _____
// / ____| | | |/ (_) | | | \ | | | | / ____|
// | | ___ ___ | | ' / _ __| |___| \| | _____ _| |_| | __ ___ _ __
// | | / _ \ / _ \| | < | |/ _` / __| . ` |/ _ \ \/ / __| | |_ |/ _ \ '_ \
// | |___| (_) | (_) | | . \| | (_| \__ \ |\ | __/> <| |_| |__| | __/ | | |
// \_____\___/ \___/|_|_|\_\_|\__,_|___/_| \_|\___/_/\_\\__|\_____|\___|_| |_|
// XXXXXXXXXXXXXXXXXXXXXX0OOKXXXXXXXXXKOOOOOOOOOOOOOOOOOOOOOOkxdolcccccld0X0KXXXXXXXXXXXXXXXX
// XXXXXXXXXXXXXXXXXXXXX0kOKXXXXXXXXXKOOOOOOOOOOOOOOOOOOOxl:,,,;;;::cc,. oX0OKXXXXXXXXXXXXXXX
// XXXXXXXXXXXXXXXXXXXX0kxkKXXXXXXXXKOkOOOkdolc::;,;;;,,;;;cldkOOOOOOd'.:xOKOOKXXXXXXXXXXXXXX
// XXXXXXXXXXXXXXXXKKK0kxxxkKKKKXXXKkl::,'..'';:ccloxxooxOOOOOOOOOOkc..,;,'ckO0XXXXXXXXXXXXXX
// XXXXXXXXXXXXXXXKOkOOkxkOkkkxOXKx;..,;:loxkOOOOxldOOOOOOOOOOOOOOo' .'cxc.;kOKXXXXXXXXXXXXX
// XXXXXXXXXXXXXXKOkkkOOkkkkkxlc:'.'lkOOOOOOOOxc,,lkOOOOOOOOOOOOkc. .cxOOx'.lkOKXXXXXXXXXXXX
// XXXXXXXXXXXXXKOkOOOK0kkxc;'. 'lkOOOOOOOOkc,;ldOOOOOOOOOOOOOd' .cxOOOOO: ;kOKXXXXXXXXXXXX
// XXXXXXXXXXXXK0k0XXXX0d:'','.,okOOOOOOOOOkc,oOOOOOOOOOOOOOOk:. 'lkOOOOOOOl.,kOOKXXXXXXXXXXX
// XXXXXXXXXXXK0k0XXKx:'.;ol,;oOOOOOOOOOOOOOkOOOOOOOOOOOOOOOd'.,okOOOOOOOOOd..x0kOOOKXXXXXXXX
// XXXXXXXXXXX0kOX0o'.,lxOxcokOOOOOOOOOOOOOOOOOOOOOOOOOOOOOl';dOOOOOOOOOOOOx'.dXK0Ok0XXXXXXXX
// XXXXXXXXXXKOOKO,.;dOOOOOOOOOOkkOOOOOOOOOOOOOOOOOOOOOOOOxcoOOOOOOOOOOOOOOd..xXXXKOOKXXXXXXX
// XXXXXXXXXXOk0Xo ,kOOOOOOOOOOd:dOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOk, ,lkXXX0k0XXXXXXX
// XXXXXXXXX0kOXXc ,kOOOOOOOOOd,cOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOk: ..cKXXKOOKXXXXXX
// XXXXXXXXKOOKXo. ,kOOOOOOOOO;;kOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOc ,d:'kXXX0k0XXXXXX
// XXXXXXXKOk0Xk. ,kOOOOOOOOk,;kOOOOOOOOOOOOOOOOOxxOOOOOOOOOOOOOOOOOOOOl.'okOl.lXKX0kOKXXXXX
// XXXXXXX0kOX0;.,.'kOOOOOOOOO;.dOOOOOOOOOOOOOOO0o.:OOOOOOOOkolokOOOOOOklckOOOo.:0OOkkkO00KXX
// XXXXXXKOOKXd.'dooOOOOOOOOOOl.;OOOOOOOOOOxoc:cl, ;kOOOxl:'...ckOOOOOOOOOOOOOd.;0OkkkOkxxk0X
// XXXXXX0k0XXl ,kOOOOOOOOOOOko..oOOOOOOkl,.,cdOKo..ll;'.';ld,.dOOOOOOOOOOOOOOd.,xkkkkkkkOOKX
// XXXXXKOO0XXd..dOOOxoxOOxl;.';..dOOOOd'.,d0XKXXO, ..;lx0KXKc.lOOOOOOOOOOOOOOd.,kkkkOOk0XXXX
// XXXXX0kkOKX0; :OOk,.cl,..,oO0l.'dOOo..oKKKKKKKKOxdl;,;xKKK: cOOOOOOOOOOOOOOd.,xxkOKKOOKXXX
// XXXXKOkxx0XXx..oOc .':ccccc::;..ll..oKKKKKKKKKKx;;oo,,xX0; ;oc;'',:dOOOOOOd.;kOOOKXOk000K
// XXXX0kxxxOKK0c ,o' .oKKKKOxoox0x;..'dKKKKKKKKKXKOk0KK0O0KKl... .. .lOOOOOc'dXXXXXX0kkOkO
// KO00Oxxkkkkkkd,....o0OxxxxxkOKKKKOk0KKKKXKKKKKKKKKKKK0KKKKKkxoclkO, ;kOOkc.cKXXXXXXX00K0k
// OkkOkxkOOOOOOOd' .;kKo'..:;.,kXKKKKKKKKKKKKKKKKd,'',;:;;xXKKKKx;oO, cOOx;.:OKXXXXXXXXXXKO
// Okkkkkkkkkkkkxxd:',xXKo.:N0,.kXKKKKKKKKKKKKKKXKOd,.l0Kc.lXKKKKxdk: :kOd'.,ccxXXXXXXXXXXX0
// kOkkOKKKKKKKkxkkxc:xKKk,.:,.:0KKKKKKKKKKKKKKKKKKXo.,xd'.xXKKK0dc. .ckOd' . ,xKXXXXXXXXXXK
// OK00KXXXXXXKOkkkxxdxkkkxl::o0KKKKKKKKKXXXKX0OO0KKKd;'.,xKKKKXk' ,dOOOx:...ckOO0XXXXXXXXXX
// 0XXXXXXXXXXXX0OOOl';k00KKXXKKKKKKK0xdoollol;lk0XKKKK00KKKKKKKK: ,kOOOo;..cxOOOOk0XXXXXXXXX
// KXXXXXXXXXXXK0OOOk;.;kKKKKXKKKKKKKkl::;:::cd0XKKKKKKKKKKKKKKKKl ,kkl,.'lkOOOOOOkOKXXXXXXXX
// XXXXXXXXXXXX0OOOOOkc..:d0XKKKKKKKXXXXXXXXXXXKKKKKKKKKKKKKKKKKXo .;'.'lkOOOOOOOOOOKXXXXXXXX
// XXXXXXXXXXXKOOOOOOOOxl'.'cdOKXXKKKKKKKKKKKKKKKXKKKKKKKKKKKKKOd, 'oOOOOOOOOOOOOk0XXXXXXXX
// XXXXXXXXXK00OOOOOOOOOOOdc,..,coxO0KXKKKKKKKKKKKKKKKXKKKKKX0d, . .':lxOOOOOOOOOO0XXXXXXXX
// XXXXXXXXKOOOOOOOOOOOOOOOkl'. ':xKXKKKKKKKKKKKKKKKKKKKKKKKd' ';. ',...,cdOOOkkkkk0KKKXXXX
// XXXXXXXXOkOOOOOOOOOOOOd:... ...l0KKKKKKKKKKKKKKKKKKKKKKKKx:..,;. 'lllc;'..,dOOkkxxxkkkOO0K
// XXXXXXXKkkOOOOOOOOOOo,..,cc..'..,okKKXKKKKKKKKKKKKKKK0xl,..'::. 'cllllllc. .lkOkkxkOkxxkk0
// XXXXXXX0kkOOOOOOOOOc..,clll' .:,...':lxkOOOO000OOkdl:'..';cc,. ,lllllllc. ...,dxxkkkkkOOOk
// XXXXXXKOxxOOOOOOOOo. .cllll; .:lc:;'.................,;ccc:' .;lllllll;. 'cc' 'okkkOOOOOOk
// XXXXXX0kxxkOOOOOOd. . .:llll' .;cccccc:::;;;;;;;::cccccc;'..'cllllllc, .;cc,. 'xOOOOOOOOO
// XXXXXKOxxkxkOOOOk, 'c' .:llll;. .;ccccccccccccccccccc:'...':lllllllc. .::'..'c;.,kOOOOOOOO
// XXXXX0kxkOkkkkkko' .:c, .:llllc,. .,:ccccccccccccc:,...';cllllllll;. ';'..:x0XO; :OOOOOOOO
// XXXXKOkxkOOOOOOOkc...';. 'llllllc,. .';cccccccc;....;cllllllllll,..'...ckKKKKXx..oOOOOOOO
// XXXX0kkkkkkkkkxkkoldc. 'lllllllll:,.....,;,'....,cllllllllllll, ...cOKKKKKKKKc ,kOOOOOO
// XXXKOkOOOOOOOOkkkkxxkl. ;lllllllllllll:,'.....,:llllllllllllll:. .;xKKKKKKKKKXk'.lOOOOOO
// XXX0kkOOOOOOOOkc:dOkkkl..:lllllllllllllllllclllllllllllllllllll:. 'dKKKKKKKKKKKKKc ,kOOOOO
// XXKOkOOOOOOOOOd..dXKKKo .collllllllllllllllllllllllllllllllllllc..oXKKKKKKKKKKKKXx..dOOOOO
contract CoolKidsNextGen is ERC721Enum {
using Strings for uint256;
uint256 public constant COOL_KIDS_NEXT_GEN_SUPPLY = 5000;
uint256 public constant MAX_MINT_PER_TX = 10;
uint256 public coolKidsFree = 1000;
uint256 public price = 0.01 ether;
address private constant addressOne = 0xb0039C1f0b355CBE011b97bb75827291Ba6D78Cb
;
address private constant addressTwo = 0x642559efb3C1E94A30ABbCbA431f818FbD507820
;
address private constant addressThree = 0x1D3c99D01329b2D98CC3a7Fa5178aB4A31F7c155
;
bool public pauseMint = true;
string public baseURI;
string internal baseExtension = ".json";
address public immutable owner;
constructor() ERC721P("CoolKidsNextGen", "CKNG") {
owner = msg.sender;
}
modifier mintOpen() {
require(!pauseMint, "mint paused");
_;
}
modifier onlyOwner() {
_onlyOwner();
_;
}
/** INTERNAL */
function _onlyOwner() private view {
require(msg.sender == owner, "onlyOwner");
}
function _baseURI() internal view virtual returns (string memory) {
return baseURI;
}
/** Mint CoolKidsNextGen */
function mint(uint16 amountPurchase) external payable mintOpen {
uint256 currentSupply = totalSupply();
require(
amountPurchase <= MAX_MINT_PER_TX,
"Max10perTX"
);
require(
currentSupply + amountPurchase <= COOL_KIDS_NEXT_GEN_SUPPLY,
"soldout"
);
if(currentSupply > coolKidsFree) {
require(msg.value >= price * amountPurchase, "not enougth eth");
}
for (uint8 i; i < amountPurchase; i++) {
_safeMint(msg.sender, currentSupply + i);
}
}
/** Get tokenURI */
function tokenURI(uint256 tokenId)
public
view
virtual
override
returns (string memory)
{
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent meow");
string memory currentBaseURI = _baseURI();
return (
bytes(currentBaseURI).length > 0
? string(
abi.encodePacked(currentBaseURI, tokenId.toString(), baseExtension)
)
: ""
);
}
/** ADMIN SetPauseMint*/
function setPauseMint(bool _setPauseMint) external onlyOwner {
pauseMint = _setPauseMint;
}
/** ADMIN SetBaseURI*/
function setBaseURI(string memory _newBaseURI) external onlyOwner {
baseURI = _newBaseURI;
}
/** ADMIN SetFreeSupply*/
function setFreeSupply(uint256 _freeSupply) external onlyOwner {
coolKidsFree = _freeSupply;
}
/** ADMIN SetPrice*/
function setPrice(uint256 _price) external onlyOwner {
price = _price;
}
/** ADMIN withdraw*/
function withdrawAll() external onlyOwner {
uint256 balance = address(this).balance;
require(balance > 0, "No money");
_withdraw(addressOne, (balance * 30) / 100);
_withdraw(addressTwo, (balance * 30) / 100);
_withdraw(addressThree, (balance * 30) / 100);
_withdraw(msg.sender, address(this).balance);
}
function _withdraw(address _address, uint256 _amount) private {
(bool success, ) = _address.call{ value: _amount }("");
require(success, "Transfer failed");
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Strings.sol)
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: GPL-3.0
pragma solidity ^0.8.10;
import "ERC721P.sol";
import "IERC721Enumerable.sol";
abstract contract ERC721Enum is ERC721P, IERC721Enumerable {
function supportsInterface(bytes4 interfaceId)
public
view
virtual
override(IERC165, ERC721P)
returns (bool)
{
return
interfaceId == type(IERC721Enumerable).interfaceId ||
super.supportsInterface(interfaceId);
}
function tokenOfOwnerByIndex(address owner, uint256 index)
public
view
override
returns (uint256 tokenId)
{
require(index < ERC721P.balanceOf(owner), "ERC721Enum: owner ioob");
uint256 count;
for (uint256 i; i < _owners.length; ++i) {
if (owner == _owners[i]) {
if (count == index) return i;
else ++count;
}
}
require(false, "ERC721Enum: owner ioob");
}
function tokensOfOwner(address owner) public view returns (uint256[] memory) {
require(0 < ERC721P.balanceOf(owner), "ERC721Enum: owner ioob");
uint256 tokenCount = balanceOf(owner);
uint256[] memory tokenIds = new uint256[](tokenCount);
for (uint256 i = 0; i < tokenCount; i++) {
tokenIds[i] = tokenOfOwnerByIndex(owner, i);
}
return tokenIds;
}
function totalSupply() public view virtual override returns (uint256) {
return _owners.length;
}
function tokenByIndex(uint256 index)
public
view
virtual
override
returns (uint256)
{
require(index < ERC721Enum.totalSupply(), "ERC721Enum: global ioob");
return index;
}
}
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.10;
import "IERC721.sol";
import "IERC721Receiver.sol";
import "IERC721Metadata.sol";
import "Address.sol";
import "Context.sol";
import "ERC165.sol";
abstract contract ERC721P is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
string private _name;
string private _symbol;
address[] internal _owners;
mapping(uint256 => address) private _tokenApprovals;
mapping(address => mapping(address => bool)) private _operatorApprovals;
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
function supportsInterface(bytes4 interfaceId)
public
view
virtual
override(ERC165, IERC165)
returns (bool)
{
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}
function balanceOf(address owner)
public
view
virtual
override
returns (uint256)
{
require(owner != address(0), "ERC721: balance query for the zero address");
uint256 count = 0;
uint256 length = _owners.length;
for (uint256 i = 0; i < length; ++i) {
if (owner == _owners[i]) {
++count;
}
}
delete length;
return count;
}
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;
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
function approve(address to, uint256 tokenId) public virtual override {
address owner = ERC721P.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);
}
function getApproved(uint256 tokenId)
public
view
virtual
override
returns (address)
{
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
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);
}
function isApprovedForAll(address owner, address operator)
public
view
virtual
override
returns (bool)
{
return _operatorApprovals[owner][operator];
}
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);
}
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}
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);
}
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"
);
}
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return tokenId < _owners.length && _owners[tokenId] != address(0);
}
function _isApprovedOrOwner(address spender, uint256 tokenId)
internal
view
virtual
returns (bool)
{
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ERC721P.ownerOf(tokenId);
return (spender == owner ||
getApproved(tokenId) == spender ||
isApprovedForAll(owner, spender));
}
function _safeMint(address to, uint256 tokenId) internal virtual {
_safeMint(to, tokenId, "");
}
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"
);
}
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);
_owners.push(to);
emit Transfer(address(0), to, tokenId);
}
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721P.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
_owners[tokenId] = address(0);
emit Transfer(owner, address(0), tokenId);
}
function _transfer(
address from,
address to,
uint256 tokenId
) internal virtual {
require(
ERC721P.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);
}
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721P.ownerOf(tokenId), to, tokenId);
}
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;
}
}
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721.sol)
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
// OpenZeppelin Contracts v4.4.0 (utils/introspection/IERC165.sol)
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
// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721Receiver.sol)
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
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Metadata.sol)
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
// OpenZeppelin Contracts v4.4.0 (utils/Address.sol)
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
// OpenZeppelin Contracts v4.4.0 (utils/Context.sol)
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
// OpenZeppelin Contracts v4.4.0 (utils/introspection/ERC165.sol)
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
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Enumerable.sol)
pragma solidity ^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
*/
interface IERC721Enumerable is IERC721 {
/**
* @dev Returns the total amount of tokens stored by the contract.
*/
function totalSupply() external view returns (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.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (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.
*/
function tokenByIndex(uint256 index) external view returns (uint256);
}