Contract Source Code:
File 1 of 1 : PixlPets
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
//
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
/**
* @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);
}
//
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.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;
}
//
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
/**
* @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);
}
//
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.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);
}
//
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
/**
* @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;
}
}
//
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
/**
* @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);
}
}
//
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.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;
}
}
//
library AddressGasOptimized {
function isContract(address account) internal view returns (bool) {
uint size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
}
//
abstract contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using AddressGasOptimized for address;
using Strings for uint256;
string private _name;
string private _symbol;
// Mapping from token ID to owner address
address[] internal _owners;
mapping(uint256 => address) private _tokenApprovals;
mapping(address => mapping(address => bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor(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 (uint)
{
require(owner != address(0), "ERC721: balance query for the zero address");
uint count;
for( uint i; i < _owners.length; ++i ){
if( owner == _owners[i] )
++count;
}
return count;
}
/**
* @dev See {IERC721-ownerOf}.
*/
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 {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 tokenId < _owners.length && _owners[tokenId] != address(0);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId)
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);
_owners.push(to);
emit Transfer(address(0), to, tokenId);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
_owners[tokenId] = address(0);
emit Transfer(owner, address(0), tokenId);
}
/**
* @dev Transfers `tokenId` from `from` to `to`.
* As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
*
* Emits a {Transfer} event.
*/
function _transfer(
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);
_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 {}
}
//
// OpenZeppelin Contracts v4.4.1 (access/Ownable.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() {
_transferOwnership(_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 {
_transferOwnership(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");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
//
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/MerkleProof.sol)
/**
* @dev These functions deal with verification of Merkle Trees proofs.
*
* The proofs can be generated using the JavaScript library
* https://github.com/miguelmota/merkletreejs[merkletreejs].
* Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
*
* See `test/utils/cryptography/MerkleProof.test.js` for some examples.
*/
library MerkleProof {
/**
* @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
* defined by `root`. For this, a `proof` must be provided, containing
* sibling hashes on the branch from the leaf to the root of the tree. Each
* pair of leaves and each pair of pre-images are assumed to be sorted.
*/
function verify(
bytes32[] memory proof,
bytes32 root,
bytes32 leaf
) internal pure returns (bool) {
return processProof(proof, leaf) == root;
}
/**
* @dev Returns the rebuilt hash obtained by traversing a Merklee tree up
* from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
* hash matches the root of the tree. When processing the proof, the pairs
* of leafs & pre-images are assumed to be sorted.
*
* _Available since v4.4._
*/
function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
bytes32 computedHash = leaf;
for (uint256 i = 0; i < proof.length; i++) {
bytes32 proofElement = proof[i];
if (computedHash <= proofElement) {
// Hash(current computed hash + current element of the proof)
computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
} else {
// Hash(current element of the proof + current computed hash)
computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
}
}
return computedHash;
}
}
//
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)
/**
* @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 making 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;
}
}
//
/**
* ______ __ __ __ __ ______ ______ ______ ______
* /\ == \ /\ \ /\_\_\_\ /\ \ /\ == \ /\ ___\ /\__ _\ /\ ___\
* \ \ _-/ \ \ \ \/_/\_\/_ \ \ \____ \ \ _-/ \ \ __\ \/_/\ \/ \ \___ \
* \ \_\ \ \_\ /\_\/\_\ \ \_____\ \ \_\ \ \_____\ \ \_\ \/\_____\
* \/_/ \/_/ \/_/\/_/ \/_____/ \/_/ \/_____/ \/_/ \/_____/
*/
contract PixlPets is ERC721, Ownable, ReentrancyGuard {
bool public IS_PUBLIC_SALE_ACTIVE = false;
uint256 public constant FREE_MINT_MAPPING_ID = 0;
uint256 public constant PRESALE_MAPPING_ID = 1;
uint256 public constant PUBLIC_MAPPING_ID = 2;
uint256 public constant MAX_PER_FREE_MINT = 1;
uint256 public MAX_PER_PS_SPOT = 2;
uint256 public MAX_PER_PUBLIC_MINT = 10;
uint256 public PRESALE_MINT_PRICE = 0.088 ether;
uint256 public PUBLIC_MINT_PRICE = 0.12 ether;
uint256 public MAX_SUPPLY = 15000;
uint256 public PHASE_ID = 1;
bytes32 public presaleMerkleRoot;
bytes32 public freeMintMerkleRoot;
string public baseURI;
/**
* @dev Allow for multiple "phases" of mints to take place on a single contract,
* keeping track of wallet supply limits for each phase.
*/
mapping(uint => mapping(uint => mapping(address => uint))) public phaseToMappingIdToSupplyMap;
modifier isCorrectPayment(uint256 price, uint256 numberOfTokens) {
require(
price * numberOfTokens == msg.value,
"Incorrect ETH value sent"
);
_;
}
modifier hasAvailableSupply(uint256 potentialNewBalance, uint256 limit) {
require(potentialNewBalance <= limit,
"Exceeds allocated supply for this user via attempted mint function.");
_;
}
modifier isValidMerkleProof(bytes32 root, bytes32[] calldata proof) {
require(_verify(msg.sender, root, proof), "Sender not in MerkleTree");
_;
}
constructor(string memory _baseURI) ERC721("Pixl Pets", "PIXLP") {
baseURI = _baseURI;
address purgatory = 0x0000000000000000000000000000000000000000;
_owners.push(purgatory); // Offest to create gas optimized 1-indexed id space
}
/******** Read-only Functions *********/
function totalSupply() external view virtual returns (uint256) {
return _owners.length - 1;
}
function tokenURI(uint256 _tokenId) external view override returns (string memory) {
require(_exists(_tokenId), "Token does not exist.");
return string(abi.encodePacked(baseURI, Strings.toString(_tokenId)));
}
/**
* @dev Use in front end to render counts for user's Mint UI in single SC call,
* drastically reducing load on Infura for pageLoads:
* (numFreeMintsRemaining, numPresaleMintsRemaining, numPublicMintsRemaining,
* totalMinted, totalRemainingSupply)
*/
function getMintProgress(address userWallet, bytes32[] calldata freeMintProof, bytes32[] calldata presaleProof)
external
view
returns (uint, uint, uint, uint, uint)
{
uint totalMinted = _owners.length - 1;
uint freeMintsRemaining = 0;
uint psMintsRemaining = 0;
uint publicMintsRemaining = MAX_PER_PUBLIC_MINT
- phaseToMappingIdToSupplyMap[PHASE_ID][PUBLIC_MAPPING_ID][userWallet];
if (_verify(userWallet, freeMintMerkleRoot, freeMintProof)) {
freeMintsRemaining += (MAX_PER_FREE_MINT
- phaseToMappingIdToSupplyMap[PHASE_ID][FREE_MINT_MAPPING_ID][userWallet]);
}
if (_verify(userWallet, presaleMerkleRoot, presaleProof)) {
psMintsRemaining += (MAX_PER_PS_SPOT
- phaseToMappingIdToSupplyMap[PHASE_ID][PRESALE_MAPPING_ID][userWallet]);
}
return (
freeMintsRemaining,
psMintsRemaining,
publicMintsRemaining,
totalMinted,
MAX_SUPPLY - totalMinted
);
}
/******** Minting Functions *********/
/**
* @dev Combine full free claim and presale in single transaction to save ~30k wei gas.
* @notice Congratulations!!! You're saving some gas by combining your free claim and WL mint txns!
*/
function omegaMint(bytes32[] calldata freeMintProof, bytes32[] calldata presaleProof)
external
payable
isCorrectPayment(PRESALE_MINT_PRICE, MAX_PER_PS_SPOT)
hasAvailableSupply(
phaseToMappingIdToSupplyMap[PHASE_ID][FREE_MINT_MAPPING_ID][msg.sender] + MAX_PER_FREE_MINT,
MAX_PER_FREE_MINT)
hasAvailableSupply(
phaseToMappingIdToSupplyMap[PHASE_ID][PRESALE_MAPPING_ID][msg.sender] + MAX_PER_PS_SPOT,
MAX_PER_PS_SPOT)
isValidMerkleProof(presaleMerkleRoot, presaleProof)
isValidMerkleProof(freeMintMerkleRoot, freeMintProof)
nonReentrant
{
uint256 totalSupplySaveFunctionGas = _owners.length - 1;
require(
totalSupplySaveFunctionGas + MAX_PER_PS_SPOT + MAX_PER_FREE_MINT <= MAX_SUPPLY,
"Exceeds max supply, collection is sold out!"
);
phaseToMappingIdToSupplyMap[PHASE_ID][FREE_MINT_MAPPING_ID][msg.sender] += MAX_PER_FREE_MINT;
phaseToMappingIdToSupplyMap[PHASE_ID][PRESALE_MAPPING_ID][msg.sender] += MAX_PER_PS_SPOT;
for(uint i; i < MAX_PER_FREE_MINT + MAX_PER_PS_SPOT; i++) {
_mint(msg.sender, totalSupplySaveFunctionGas + i + 1);
}
}
/**
* @dev Check MerkleTree to see if able to claim, then GIMME THAT PIXL PET!!!
* @notice Congratulations lucky Founder's Pass holder or giveaway winner: you've earned a free PIXL Pet!
*/
function claimFreeMint(bytes32[] calldata proof)
external
hasAvailableSupply(
phaseToMappingIdToSupplyMap[PHASE_ID][FREE_MINT_MAPPING_ID][msg.sender] + 1,
MAX_PER_FREE_MINT)
isValidMerkleProof(freeMintMerkleRoot, proof)
nonReentrant
{
uint256 totalSupplySaveFunctionGas = _owners.length - 1;
require(
totalSupplySaveFunctionGas + 1 <= MAX_SUPPLY,
"Exceeds max supply, should've claimed sooner :/"
);
phaseToMappingIdToSupplyMap[PHASE_ID][FREE_MINT_MAPPING_ID][msg.sender] += 1;
_mint(msg.sender, totalSupplySaveFunctionGas + 1);
}
/**
* @dev Check preset MerkleRoot for inclusion of wallet in Presale set before minting up to .
* @notice Congratulations lucky Founder's Pass holder or giveaway winner: you've earned PIXL Pet Presale spots!
*/
function presaleMint(uint256 amount, bytes32[] calldata proof)
external
payable
isCorrectPayment(PRESALE_MINT_PRICE, amount)
hasAvailableSupply(
phaseToMappingIdToSupplyMap[PHASE_ID][PRESALE_MAPPING_ID][msg.sender] + amount,
MAX_PER_PS_SPOT)
isValidMerkleProof(presaleMerkleRoot, proof)
nonReentrant
{
uint256 totalSupplySaveFunctionGas = _owners.length - 1;
require(totalSupplySaveFunctionGas + amount <= MAX_SUPPLY, "Exceeds Max supply, Pixl Pets are sold out!");
phaseToMappingIdToSupplyMap[PHASE_ID][PRESALE_MAPPING_ID][msg.sender] += amount;
for(uint i; i < amount; i++) {
_mint(msg.sender, totalSupplySaveFunctionGas + i + 1);
}
}
function publicMint(uint256 amount)
external
payable
isCorrectPayment(PUBLIC_MINT_PRICE, amount)
hasAvailableSupply(
phaseToMappingIdToSupplyMap[PHASE_ID][PUBLIC_MAPPING_ID][msg.sender] + amount,
MAX_PER_PUBLIC_MINT)
nonReentrant
{
uint256 totalSupplySaveFunctionGas = _owners.length - 1;
require(IS_PUBLIC_SALE_ACTIVE, 'Public sale is inactive! pls stop');
require(totalSupplySaveFunctionGas + amount <= MAX_SUPPLY, "Exceeds max supply, Pixl Pets are sold out!");
phaseToMappingIdToSupplyMap[PHASE_ID][PUBLIC_MAPPING_ID][msg.sender] += amount;
for(uint i; i < amount; i++) {
_mint(msg.sender, totalSupplySaveFunctionGas + i + 1);
}
}
function burn(uint256 tokenId) external {
require(_isApprovedOrOwner(msg.sender, tokenId), "Not approved to burn.");
_burn(tokenId);
}
/*********** ADMIN FUNCTIONS ************/
function adminMint(uint256 amount, address _to)
external
onlyOwner
{
uint256 totalSupplySaveFunctionGas = _owners.length - 1;
require(totalSupplySaveFunctionGas + amount <= MAX_SUPPLY, "Exceeds max supply.");
for(uint i; i < amount; i++) {
_mint(_to, totalSupplySaveFunctionGas + i + 1);
}
}
/** @dev Will enable presale mints! */
function setPresaleMerkleRoot(bytes32 _presaleMerkleRoot) external onlyOwner {
presaleMerkleRoot = _presaleMerkleRoot;
}
/** @dev Will enable claimable free mints! */
function setFreeMintMerkleRoot(bytes32 _freeMintMerkleRoot) external onlyOwner {
freeMintMerkleRoot = _freeMintMerkleRoot;
}
function setBaseURI(string memory _baseURI) external onlyOwner {
baseURI = _baseURI;
}
function updateMaxSupply(uint256 _MAX_SUPPLY) external onlyOwner {
MAX_SUPPLY = _MAX_SUPPLY;
}
function toggleIsPublicSaleActive() external onlyOwner {
IS_PUBLIC_SALE_ACTIVE = !IS_PUBLIC_SALE_ACTIVE;
}
function updateMaxPresaleSupply(uint256 _MAX_PER_PS_SPOT) external onlyOwner {
MAX_PER_PS_SPOT = _MAX_PER_PS_SPOT;
}
function updateMaxPublicSupply(uint256 _MAX_PER_PUBLIC_MINT) external onlyOwner {
MAX_PER_PUBLIC_MINT = _MAX_PER_PUBLIC_MINT;
}
/** @dev Value in wei (ether_value * (10 ** 18)) aka add 18 zeroes */
function updatePresaleMintPrice(uint256 _PRESALE_MINT_PRICE) external onlyOwner {
PRESALE_MINT_PRICE = _PRESALE_MINT_PRICE;
}
/** @dev Value in wei (ether_value * (10 ** 18)) aka add 18 zeroes */
function updatePublicMintPrice(uint256 _PUBLIC_MINT_PRICE) external onlyOwner {
PUBLIC_MINT_PRICE = _PUBLIC_MINT_PRICE;
}
/** @dev Effectively reset wallet supply mappings by allocating a new spot in memory */
function incrementPhaseVersion()
external
onlyOwner
{
PHASE_ID += 1;
}
/** @dev Revert to a previous wallet supply mapping */
function decrementPhaseVersion()
external
onlyOwner
{
PHASE_ID -= 1;
}
function batchSafeTransferFrom(address _from, address _to, uint256[] memory _tokenIds, bytes memory data_)
external
onlyOwner
{
for (uint256 i = 0; i < _tokenIds.length; i++) {
safeTransferFrom(_from, _to, _tokenIds[i], data_);
}
}
function withdrawETH() external onlyOwner {
(bool success, ) = (msg.sender).call{value: address(this).balance}("");
require(success, "Failed to send ETH.");
}
/********** PRIVATE FUNCTIONS *********/
function _mint(address to, uint256 tokenId) internal virtual override {
_owners.push(to);
emit Transfer(address(0), to, tokenId);
}
/** @dev Turn msg.sender into a string, hash it, and check if its valid within merkle root + proof */
function _verify(
address _buyerAddress,
bytes32 _merkleRoot,
bytes32[] memory _proof) internal pure returns (bool) {
return _merkleRoot != 0
&& MerkleProof.verify(_proof, _merkleRoot, keccak256(abi.encodePacked(_buyerAddress)));
}
}