Contract Name:
YourContract
Contract Source Code:
pragma solidity >=0.8.0 <0.9.0;
//SPDX-License-Identifier: MIT
//import "hardhat/console.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import 'base64-sol/base64.sol';
import "./SnakerMaker.sol";
// import "@openzeppelin/contracts/access/Ownable.sol";
// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol
contract YourContract is ERC721, ERC721Enumerable, ReentrancyGuard, Ownable {
constructor() ERC721("SNAKESONACHAIN", "SNKS") {}
using Strings for uint256;
using Counters for Counters.Counter;
Counters.Counter private _tokenIds;
uint256 public constant MAX_SUPPLY = 2000;
uint256 public constant PRICE = 0.015 ether;
function contractURI() public view returns (string memory) {
return "https://snakesonachain.club/my-metadata";
}
function mintItem(uint256 numTokens)
public
payable
virtual
{
_mintItem(numTokens, _msgSender());
}
function mintForFriend(uint256 numTokens, address walletAddress)
public
payable
virtual
{
_mintItem(numTokens, walletAddress);
}
function _mintItem(uint256 numTokens, address destination) private {
require(numTokens > 0, "Negative");
require(PRICE * numTokens == msg.value, "amount wrong");
require(totalSupply() < MAX_SUPPLY, "sold out");
require(totalSupply() + numTokens <= MAX_SUPPLY, "Too many");
require( numTokens < 21, "Too many");
for (uint256 i = 0; i < numTokens; i++) {
uint256 id = _tokenIds.current();
_safeMint(destination, id);
_tokenIds.increment();
}
}
function getTotalSupply() public view returns (uint256) {
return totalSupply();
}
function withdrawAll() public payable nonReentrant onlyOwner {
require(payable(_msgSender()).send(address(this).balance));
}
function tokenURI(uint256 id) public view override returns (string memory) {
require(_exists(id), "id does not exist");
SnakerMaker.Snake memory snk;
string memory svg;
string[3] memory backgroundNames = [
"WATER",
"DESERT",
"SPACE"
];
string[5] memory thicknessNames = [
"SKINNY",
"WHIMSY",
"BASIC",
"NOICE",
"THICC"
];
string memory name = string(abi.encodePacked('Snake on a chain #',id.toString()));
string memory description = string(abi.encodePacked('Every snake follows its own path (in life)'));
(snk, svg) = SnakerMaker.generateSVGofTokenById(id);
string memory image = Base64.encode(bytes(svg));
return
string(
abi.encodePacked(
'data:application/json;base64,',
Base64.encode(
bytes(
abi.encodePacked(
'{"name":"',
name,
'", "description":"',
description,
'", "attributes": [{"trait_type": "Color", "value": "',
//SnakerMaker.toHSLString(snk.color),
'"},{"trait_type": "Background", "value": "',
backgroundNames[snk.bgIdx],
'"},{"trait_type": "Thickness", "value": "',
thicknessNames[snk.thickIdx],
'"}], "image": "',
'data:image/svg+xml;base64,',
image,
'"}'
)
)
)
)
);
}
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal override(ERC721, ERC721Enumerable) {
super._beforeTokenTransfer(from, to, tokenId);
}
function supportsInterface(bytes4 interfaceId)
public
view
override(ERC721, ERC721Enumerable)
returns (bool)
{
return super.supportsInterface(interfaceId);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/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 "../ERC721.sol";
import "./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.
*/
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
// Mapping from owner to list of owned token IDs
mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
// Mapping from token ID to index of the owner tokens list
mapping(uint256 => uint256) private _ownedTokensIndex;
// Array with all token ids, used for enumeration
uint256[] private _allTokens;
// Mapping from token id to position in the allTokens array
mapping(uint256 => uint256) private _allTokensIndex;
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
return _ownedTokens[owner][index];
}
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _allTokens.length;
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
return _allTokens[index];
}
/**
* @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` cannot be the zero address.
* - `to` cannot be the zero address.
*
* 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 override {
super._beforeTokenTransfer(from, to, tokenId);
if (from == address(0)) {
_addTokenToAllTokensEnumeration(tokenId);
} else if (from != to) {
_removeTokenFromOwnerEnumeration(from, tokenId);
}
if (to == address(0)) {
_removeTokenFromAllTokensEnumeration(tokenId);
} else if (to != from) {
_addTokenToOwnerEnumeration(to, tokenId);
}
}
/**
* @dev Private function to add a token to this extension's ownership-tracking data structures.
* @param to address representing the new owner of the given token ID
* @param tokenId uint256 ID of the token to be added to the tokens list of the given address
*/
function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
uint256 length = ERC721.balanceOf(to);
_ownedTokens[to][length] = tokenId;
_ownedTokensIndex[tokenId] = length;
}
/**
* @dev Private function to add a token to this extension's token tracking data structures.
* @param tokenId uint256 ID of the token to be added to the tokens list
*/
function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
_allTokensIndex[tokenId] = _allTokens.length;
_allTokens.push(tokenId);
}
/**
* @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
* while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
* gas optimizations e.g. when performing a transfer operation (avoiding double writes).
* This has O(1) time complexity, but alters the order of the _ownedTokens array.
* @param from address representing the previous owner of the given token ID
* @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
*/
function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
uint256 tokenIndex = _ownedTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary
if (tokenIndex != lastTokenIndex) {
uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
}
// This also deletes the contents at the last position of the array
delete _ownedTokensIndex[tokenId];
delete _ownedTokens[from][lastTokenIndex];
}
/**
* @dev Private function to remove a token from this extension's token tracking data structures.
* This has O(1) time complexity, but alters the order of the _allTokens array.
* @param tokenId uint256 ID of the token to be removed from the tokens list
*/
function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = _allTokens.length - 1;
uint256 tokenIndex = _allTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
// an 'if' statement (like in _removeTokenFromOwnerEnumeration)
uint256 lastTokenId = _allTokens[lastTokenIndex];
_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
// This also deletes the contents at the last position of the array
delete _allTokensIndex[tokenId];
_allTokens.pop();
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^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.
*/
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;
/**
* @title Counters
* @author Matt Condon (@shrugs)
* @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
* of elements in a mapping, issuing ERC721 ids, or counting request ids.
*
* Include with `using Counters for Counters.Counter;`
*/
library Counters {
struct Counter {
// This variable should never be directly accessed by users of the library: interactions must be restricted to
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
// this feature: see https://github.com/ethereum/solidity/issues/4637
uint256 _value; // default: 0
}
function current(Counter storage counter) internal view returns (uint256) {
return counter._value;
}
function increment(Counter storage counter) internal {
unchecked {
counter._value += 1;
}
}
function decrement(Counter storage counter) internal {
uint256 value = counter._value;
require(value > 0, "Counter: decrement overflow");
unchecked {
counter._value = value - 1;
}
}
function reset(Counter storage counter) internal {
counter._value = 0;
}
}
// 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 >=0.6.0;
/// @title Base64
/// @author Brecht Devos - <[email protected]>
/// @notice Provides functions for encoding/decoding base64
library Base64 {
string internal constant TABLE_ENCODE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
bytes internal constant TABLE_DECODE = hex"0000000000000000000000000000000000000000000000000000000000000000"
hex"00000000000000000000003e0000003f3435363738393a3b3c3d000000000000"
hex"00000102030405060708090a0b0c0d0e0f101112131415161718190000000000"
hex"001a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132330000000000";
function encode(bytes memory data) internal pure returns (string memory) {
if (data.length == 0) return '';
// load the table into memory
string memory table = TABLE_ENCODE;
// multiply by 4/3 rounded up
uint256 encodedLen = 4 * ((data.length + 2) / 3);
// add some extra buffer at the end required for the writing
string memory result = new string(encodedLen + 32);
assembly {
// set the actual output length
mstore(result, encodedLen)
// prepare the lookup table
let tablePtr := add(table, 1)
// input ptr
let dataPtr := data
let endPtr := add(dataPtr, mload(data))
// result ptr, jump over length
let resultPtr := add(result, 32)
// run over the input, 3 bytes at a time
for {} lt(dataPtr, endPtr) {}
{
// read 3 bytes
dataPtr := add(dataPtr, 3)
let input := mload(dataPtr)
// write 4 characters
mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))
resultPtr := add(resultPtr, 1)
mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))
resultPtr := add(resultPtr, 1)
mstore8(resultPtr, mload(add(tablePtr, and(shr( 6, input), 0x3F))))
resultPtr := add(resultPtr, 1)
mstore8(resultPtr, mload(add(tablePtr, and( input, 0x3F))))
resultPtr := add(resultPtr, 1)
}
// padding with '='
switch mod(mload(data), 3)
case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) }
case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) }
}
return result;
}
function decode(string memory _data) internal pure returns (bytes memory) {
bytes memory data = bytes(_data);
if (data.length == 0) return new bytes(0);
require(data.length % 4 == 0, "invalid base64 decoder input");
// load the table into memory
bytes memory table = TABLE_DECODE;
// every 4 characters represent 3 bytes
uint256 decodedLen = (data.length / 4) * 3;
// add some extra buffer at the end required for the writing
bytes memory result = new bytes(decodedLen + 32);
assembly {
// padding with '='
let lastBytes := mload(add(data, mload(data)))
if eq(and(lastBytes, 0xFF), 0x3d) {
decodedLen := sub(decodedLen, 1)
if eq(and(lastBytes, 0xFFFF), 0x3d3d) {
decodedLen := sub(decodedLen, 1)
}
}
// set the actual output length
mstore(result, decodedLen)
// prepare the lookup table
let tablePtr := add(table, 1)
// input ptr
let dataPtr := data
let endPtr := add(dataPtr, mload(data))
// result ptr, jump over length
let resultPtr := add(result, 32)
// run over the input, 4 characters at a time
for {} lt(dataPtr, endPtr) {}
{
// read 4 characters
dataPtr := add(dataPtr, 4)
let input := mload(dataPtr)
// write 3 bytes
let output := add(
add(
shl(18, and(mload(add(tablePtr, and(shr(24, input), 0xFF))), 0xFF)),
shl(12, and(mload(add(tablePtr, and(shr(16, input), 0xFF))), 0xFF))),
add(
shl( 6, and(mload(add(tablePtr, and(shr( 8, input), 0xFF))), 0xFF)),
and(mload(add(tablePtr, and( input , 0xFF))), 0xFF)
)
)
mstore(resultPtr, shl(232, output))
resultPtr := add(resultPtr, 3)
}
}
return result;
}
}
pragma solidity >=0.8.0 <0.9.0;
//SPDX-License-Identifier: MIT
import "@openzeppelin/contracts/utils/Strings.sol";
import 'base64-sol/base64.sol';
//import "hardhat/console.sol";
//learn more: https://docs.openzeppelin.com/contracts/3.x/erc721
// GET LISTED ON OPENSEA: https://testnets.opensea.io/get-listed/step-two
library SnakerMaker {
using Strings for uint256;
struct Snake {
Color color;
Color bg_color;
Color bg_color_2;
uint256[2] bg_x;
uint256[2] bg_y;
string path1;
string path2;
uint256 bgIdx;
uint256 thickIdx;
uint256 thickness;
uint256 head;
uint256 head_mark;
Color head_mark_color;
uint256 snakiness_s;
uint256 snakiness_d;
uint256 skin_pattern_scale;
string skin_pattern_freq;
uint256 skin_pattern_octaves;
}
struct Color {
uint256 hue;
uint256 saturation;
uint256 lightness;
}
struct Rands {
uint256[4] x;
uint256[4] y;
}
// Visibility is `public` to enable it being called by other contracts for composition.
function generateSVGofTokenById(uint256 id) internal pure returns (Snake memory, string memory) {
string memory seed = Strings.toString(id * 4209);
Snake memory snk;
Rands memory randVal;
// Snake color
snk.color = randomColor(seed, 0, 359, 40, 100, 20, 60);
//console.log("rand color %s", toHSLString(snk.color));
// Head mark color
snk.head_mark_color = randomColor(string(abi.encodePacked(seed, "HEADCOLOR")), 0, 359, 40, 100, 20, 60);
// Background
randVal.x[0] = random(seed, "backzies") % 100;
//console.log("rand bg %s", randVal.x[0]);
if (randVal.x[0] < 30) {
//water
snk.bgIdx = 0;
snk.bg_color = randomColor(string(abi.encodePacked(seed, "bgcolor")), 160, 230, 70, 100, 25, 65);
snk.bg_color_2.hue = snk.bg_color.hue + 8;
snk.bg_color_2.lightness = snk.bg_color.lightness - 25;
snk.bg_color_2.saturation = snk.bg_color.saturation;
} else if (randVal.x[0] < 60) {
//desert
snk.bgIdx = 1;
snk.bg_x[0] = random(seed, "bgx0") % 250;
snk.bg_y[0] = random(seed, "bgy0") % 250;
snk.bg_x[1] = (random(seed, "bgx1") % 250) + 250;
snk.bg_y[1] = (random(seed, "bgy1") % 250) + 250;
} else {
// space
snk.bg_color = randomColor(string(abi.encodePacked(seed, "bgcolorspace")), 0, 359, 80, 100, 25, 60);
snk.bg_x[0] = (random(seed, "bgx0") % 2) + 1;
snk.bg_y[0] = (random(seed, "bgy0") % 60) + 15;
snk.bgIdx = 2;
}
// Snake thickness
{
snk.thickIdx = random(seed, "thicc") % 5;
//console.log("rand thick %s", snk.thickIdx);
if (snk.thickIdx < 1) {
snk.thickness = 12;
snk.head = 24;
snk.head_mark = 10;
} else if (snk.thickIdx < 2) {
snk.thickness = 21;
snk.head = 30;
snk.head_mark = 12;
} else if (snk.thickIdx < 3) {
snk.thickness =30;
snk.head = 39;
snk.head_mark = 14;
} else if (snk.thickIdx < 4) {
snk.thickness = 39;
snk.head = 42;
snk.head_mark = 16;
} else {
snk.thickness = 48;
snk.head = 48;
snk.head_mark = 18;
}
}
// Snakiness
snk.snakiness_s = (random(seed, "snakinessS") % 15) + 2;
//console.log("rand snak %s", snk.snakiness_s);
snk.snakiness_d = (random(seed, "snakiness__D") % 30) + 20;
if (snk.snakiness_d < 25) {
snk.snakiness_d = 0;
}
//console.log("rand snakd %s", snk.snakiness_d);
// Snake pattern
snk.skin_pattern_scale = (random(seed, "patternscale") % 350) + 50;
//console.log("rand scale %s", snk.skin_pattern_scale);
randVal.x[0] = random(seed, "patternfreq") % 6;
string[6] memory freq = ["0.02", "0.04", "0.06", "0.08", "0.1", "0.15"];
snk.skin_pattern_freq = freq[randVal.x[0]];
//console.log("rand freq %s", snk.skin_pattern_freq);
snk.skin_pattern_octaves = (random(seed, "patternoctaves") % 3) + 2;
//console.log("rand octaves %s", snk.skin_pattern_octaves);
// Snake path
randVal.x[0] = 250;
randVal.y[0] = randomMaxMin(seed, "ypos0", 300, 470);
randVal.x[1] = randomMaxMin(seed, "xpos1", 300, 470);
randVal.y[1] = 250;
randVal.x[2] = 250;
randVal.y[2] = randomMaxMin(seed, "ypos2", 30, 200);
randVal.x[3] = randomMaxMin(seed, "xpos3", 30, 200);
randVal.y[3] = 250;
snk.path1 = string(
abi.encodePacked(
'M250 ',
Strings.toString(randVal.y[0]),
'S',
Strings.toString(randVal.x[1]),
',',
Strings.toString(randVal.y[0]),
' ',
Strings.toString(randVal.x[1]),
',250S',
Strings.toString(randVal.x[1]),
',',
Strings.toString(randVal.y[2]),
' 250,',
Strings.toString(randVal.y[2])
));
snk.path2 = string(
abi.encodePacked(
'M250 ',
Strings.toString(randVal.y[2]),
'C',
Strings.toString(500 - randVal.x[1] ),
',',
Strings.toString(randVal.y[2]),
' ',
Strings.toString(randVal.x[3])
));
snk.path2 = string(
abi.encodePacked(
snk.path2,
',',
Strings.toString(randVal.y[2]),
' ',
Strings.toString(randVal.x[3]),
',250S',
Strings.toString(randVal.x[3]),
',',
Strings.toString(randVal.y[0]),
' 250,',
Strings.toString(randVal.y[0])
));
//console.log("path1 %s", snk.path1);
//console.log("path2 %s", snk.path2);
// backgrounds
string memory bg;
if (snk.bgIdx < 1) {
bg = string(
abi.encodePacked(
'<path fill="',
toHSLString(snk.bg_color),
'" d="M0 0h500v500H0z"/><pattern id="y" width="40" height="40" patternUnits="userSpaceOnUse"><circle cx="20" cy="20" r="10" fill="',
toHSLString(snk.bg_color_2),
'" opacity=".2"/></pattern><filter id="m"><feTurbulence type="fractalNoise" baseFrequency=".03" numOctaves="2" seed="5515"/><feDisplacementMap in="SourceGraphic" scale="100"/></filter><g filter="url(#m)"><rect x="-50%" y="-50%" width="200%" height="200%" fill="url(#y)"><animateTransform attributeName="transform" type="translate" dur="5s" values="0,0; 40,40;" repeatCount="indefinite"/></rect></g>'
)
);
} else if (snk.bgIdx < 2) {
bg = string(
abi.encodePacked(
'<defs><linearGradient id="z" gradientTransform="rotate(90)"><stop offset="5%" stop-color="#e89f00"/><stop offset="95%" stop-color="#e8ba00"/></linearGradient></defs><path fill="#e8ba00" style="filter:url(#x)" d="M0 0h500v500H0z"/><circle cx="',
Strings.toString(snk.bg_x[0]),
'" cy="',
Strings.toString(snk.bg_y[0]),
'" r="100" fill="url(#z)" filter="url(#m)"/><circle cx="',
Strings.toString(snk.bg_x[1]),
'" cy="',
Strings.toString(snk.bg_y[1]),
'" r="100" fill="url(#z)" filter="url(#m)"/><defs><filter id="x"><feSpecularLighting result="specOut" specularExponent="12" lighting-color="#bbb"><fePointLight x="250" y="-100" z="20"><animate attributeName="x" values="250;375;600" dur="30s" repeatCount="indefinite"/><animate attributeName="y" values="-100;75;250" dur="30s" repeatCount="indefinite"/></fePointLight></feSpecularLighting><feComposite in="SourceGraphic" in2="specOut" operator="arithmetic" k1=".1" k2="1" k3="2"/></filter><filter id="m" filterUnits="userSpaceOnUse"><feTurbulence baseFrequency=".011" type="fractalNoise"/><feDisplacementMap in="SourceGraphic" scale="100"><animate attributeName="scale" begin="0s" dur="3s" values="3000;3400;2700;3200;2800;3000" repeatCount="indefinite"/></feDisplacementMap></filter></defs>'
)
);
} else {
bg = string(
abi.encodePacked(
'<defs><linearGradient id="z" gradientTransform="rotate(90)"><stop offset="5%"/><stop offset="95%" stop-color="',
toHSLString(snk.bg_color),
'"/></linearGradient></defs><path fill="#e3eee" d="M0 0h500v500H0z"/><pattern id="x" width="40" height="40" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="',
Strings.toString(snk.bg_x[0]),
'" fill="transparent" stroke="#fcfbe6" opacity=".6"/></pattern><g filter="url(#m)"><rect x="-50%" y="-50%" width="200%" height="200%" fill="url(#x)"><animateTransform attributeName="transform" type="translate" dur="',
Strings.toString(snk.bg_y[0]),
's" values="0,0; 0,50; 0,0" repeatCount="indefinite"/></rect></g><filter id="n" x="-50%" y="-50%" width="200%" height="200%"><feTurbulence baseFrequency=".08" numOctaves="10" result="lol"/><feDisplacementMap in2="turbulence" in="SourceGraphic" scale="20" xChannelSelector="R" yChannelSelector="G"/><feComposite operator="in" in2="SourceGraphic"/></filter><filter id="m"><feTurbulence type="fractalNoise" baseFrequency=".1" seed="39996"/><feDisplacementMap in="SourceGraphic" xChannelSelector="B" scale="200"/></filter>'
)
);
}
string memory planet = '<circle cx="400" cy="100" r="50" fill="url(#z)"/><circle cx="400" cy="100" r="50" fill="url(#z)" filter="url(#n)"/>';
// Snake
string[5] memory snakeParts;
snakeParts[0] = string(
abi.encodePacked(
'<defs><path stroke-dasharray="1000" pathLength="1000" fill="none" stroke-linejoin="round" stroke-dashoffset="1000" stroke-linecap="round" stroke-width="',
Strings.toString(snk.thickness),
'" id="a" d="',
snk.path1,
'"/><path stroke-dasharray="1000" pathLength="1000" fill="none" stroke-linejoin="round" stroke-dashoffset="0" stroke-linecap="round" stroke-width="',
Strings.toString(snk.thickness),
'" id="c" d="',
snk.path2,
'"/><circle cx="0" cy="0" r="',
Strings.toString(snk.head),
'" id="f"/></defs><use xlink:href="#a" filter="url(#b) url(#S)" stroke="'
));
snakeParts[1] = string(
abi.encodePacked(
snk.bgIdx == 2 ? "#FFF" : "#000",
'" opacity="',
snk.bgIdx == 2 ? ".3" : ".7",
'" transform="translate(6 6)"/><use xlink:href="#c" filter="url(#b) url(#S)" stroke="',
snk.bgIdx == 2 ? "#FFF" : "#000",
'" opacity="',
snk.bgIdx == 2 ? ".3" : ".7",
'" transform="translate(6 6)"/><use xlink:href="#a" filter="url(#b)" stroke="'
));
snakeParts[2] =
string(
abi.encodePacked(
toHSLString(snk.color),
'"/><use xlink:href="#c" filter="url(#b)" stroke="',
toHSLString(snk.color),
'"/><use xlink:href="#a" filter="url(#d) url(#b)" stroke="',
toHSLString(snk.color),
'"/><use xlink:href="#c" filter="url(#d) url(#b)" stroke="',
toHSLString(snk.color),
'"/><g transform="translate(-250 -48)" id="h" filter="url(#b)"><g id="j" opacity="0" transform="translate(170 20)" filter="url(#e)"><line id="line1" x1="30" y1="30" x2="70" y2="30" stroke="red" stroke-width="3" /><line id="line1" x1="30" y1="30" x2="10" y2="10" stroke="red" stroke-width="3" /><line id="line1" x1="30" y1="30" x2="10" y2="50" stroke="red" stroke-width="3" /></g><use x="250" y="48" xlink:href="#f" filter="url(#b)" fill="',
toHSLString(snk.color),
'"/><use x="250" y="48" xlink:href="#f" filter="url(#d) url(#b)" fill="',
toHSLString(snk.color)
));
snakeParts[3] =
string(
abi.encodePacked(
'"/><path transform="rotate(45 89.216 337.812)" fill="',
toHSLString(snk.head_mark_color),
'" d="M0 0h',
Strings.toString(snk.head_mark),
'v',
Strings.toString(snk.head_mark),
'H0z"/></g>',
snk.bgIdx == 2 ? planet : "",
'<animate attributeName="stroke-dashoffset" fill="freeze" begin="0s;g.end+1s" from="0" dur="3s" xlink:href="#c" to="1000"/><animate attributeName="stroke-dashoffset" fill="freeze" begin="0s;g.end+1s" from="1000" id="i" dur="3s" xlink:href="#a" to="2000"/><animateMotion fill="freeze" begin="0s;g.end+1s" keyTimes="0 ; 1" dur="3s" xlink:href="#h" keyPoints="1 ; 0" rotate="auto" calcMode="linear"><mpath xlink:href="#a"/></animateMotion><animate attributeName="stroke-dashoffset" fill="freeze" begin="i.end" from="0" dur="3s" xlink:href="#a" to="1000"/><animate attributeName="stroke-dashoffset" fill="freeze" begin="i.end" from="1000" id="g" dur="3s" xlink:href="#c" to="2000"/><animateMotion fill="freeze" begin="i.end" keyTimes="0 ; 1" dur="3s" xlink:href="#h" keyPoints="1 ; 0" rotate="auto" calcMode="linear"><mpath xlink:href="#c"/></animateMotion><animate attributeName="opacity" fill="freeze" begin="g.end" from="0" dur="0.1s" xlink:href="#j" to="1"/><animate attributeName="opacity" fill="freeze" begin="g.end+1s" from="1" dur="0.1s" xlink:href="#j" to="0"/><defs><filter id="b" filterUnits="userSpaceOnUse"><feTurbulence baseFrequency=".35" type="fractalNoise"><animate attributeName="baseFrequency" begin="0s" dur="',
Strings.toString(snk.snakiness_s)
));
snakeParts[4] =
string(
abi.encodePacked(
's" values="0.0052;0.00753;0.0041;0.00924;0.0070;0.0052" repeatCount="indefinite"/></feTurbulence><feDisplacementMap in="SourceGraphic" scale="',
Strings.toString(snk.snakiness_d),
'"/></filter><filter id="e" width="200%" height="200%"><feTurbulence baseFrequency=".35" type="fractalNoise"><animate attributeName="baseFrequency" begin="0s" dur="0.1s" values="0.0052;0.00753;0.0041;0.00924;0.0070;0.004" repeatCount="indefinite"/></feTurbulence><feDisplacementMap in="SourceGraphic" scale="60"/></filter><filter id="d" filterUnits="userSpaceOnUse"><feTurbulence baseFrequency="',
snk.skin_pattern_freq,
'" type="fractalNoise" numOctaves="',
Strings.toString(snk.skin_pattern_octaves),
'"/><feDisplacementMap in="SourceGraphic" scale="',
Strings.toString(snk.skin_pattern_scale),
'"/><feComposite operator="in" in2="SourceGraphic"/></filter><filter id="S" width="200%" height="200%"><feGaussianBlur in="SourceGraphic" stdDeviation="4"/></filter></defs>'
));
string memory render = string(abi.encodePacked(
'<svg xmlns="http://www.w3.org/2000/svg" version="1.2" xmlns:xlink="http://www.w3.org/1999/xlink" width="500" height="500" viewBox="0 0 500 500">',
bg,
snakeParts[0],
snakeParts[1],
snakeParts[2],
snakeParts[3],
snakeParts[4],
'</svg>'
));
return (snk, render);
}
function toHSLString(Color memory color) public pure returns (string memory) {
return
string(
abi.encodePacked(
"hsl(",
color.hue.toString(),
",",
color.saturation.toString(),
"%,",
color.lightness.toString(),
"%)"
)
);
}
function randomColor(
string memory seed,
uint256 hMin,
uint256 hMax,
uint256 sMin,
uint256 sMax,
uint256 lMin,
uint256 lMax
) internal pure returns (Color memory) {
return
Color(
randomMaxMin(seed, "hue", hMin, hMax),
randomMaxMin(seed, "saturation", sMin, sMax),
randomMaxMin(seed, "lightness", lMin, lMax)
);
}
function randomMaxMin(
string memory seed,
string memory key,
uint256 min,
uint256 max
) internal pure returns (uint256) {
return
(uint256(keccak256(abi.encodePacked("mainnet", seed, key))) % (max - min)) +
min;
}
function random(string memory seed, string memory key)
internal
pure
returns (uint256)
{
return uint256(keccak256(abi.encodePacked(key, seed)));
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../../utils/introspection/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;
/**
* @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;
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;
/**
* @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;
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);
}