Contract Name:
MetaversePlayers
Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.10;
import "./ERC721P.sol";
import "./IERC721Enumerable.sol";
abstract contract ERC721Enum is ERC721P, IERC721Enumerable {
function supportsInterface(bytes4 interfaceId)
public
view
virtual
override(IERC165, ERC721P)
returns (bool)
{
return
interfaceId == type(IERC721Enumerable).interfaceId ||
super.supportsInterface(interfaceId);
}
function tokenOfOwnerByIndex(address owner, uint256 index)
public
view
override
returns (uint256 tokenId)
{
require(index < ERC721P.balanceOf(owner), "ERC721Enum: owner ioob");
uint256 count;
for (uint256 i; i < _owners.length; ++i) {
if (owner == _owners[i]) {
if (count == index) return i;
else ++count;
}
}
require(false, "ERC721Enum: owner ioob");
}
function tokensOfOwner(address owner)
public
view
returns (uint256[] memory)
{
require(0 < ERC721P.balanceOf(owner), "ERC721Enum: owner ioob");
uint256 tokenCount = balanceOf(owner);
uint256[] memory tokenIds = new uint256[](tokenCount);
for (uint256 i = 0; i < tokenCount; i++) {
tokenIds[i] = tokenOfOwnerByIndex(owner, i);
}
return tokenIds;
}
function totalSupply() public view virtual override returns (uint256) {
return _owners.length;
}
function tokenByIndex(uint256 index)
public
view
virtual
override
returns (uint256)
{
require(index < ERC721Enum.totalSupply(), "ERC721Enum: global ioob");
return index;
}
}
// SPDX-License-Identifier: GPL-3.0
// Thank you to ToyBoogers & Pagzi Tech for the optimised ERC721
pragma solidity ^0.8.10;
import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./IERC721Metadata.sol";
import "./Address.sol";
import "./Context.sol";
import "./ERC165.sol";
abstract contract ERC721P is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
string private _name;
string private _symbol;
address[] internal _owners;
mapping(uint256 => address) private _tokenApprovals;
mapping(address => mapping(address => bool)) private _operatorApprovals;
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
function getOwners() external view returns (address[] memory) {
return _owners;
}
function supportsInterface(bytes4 interfaceId)
public
view
virtual
override(ERC165, IERC165)
returns (bool)
{
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}
function balanceOf(address owner)
public
view
virtual
override
returns (uint256)
{
require(
owner != address(0),
"ERC721: balance query for the zero address"
);
uint256 count = 0;
uint256 length = _owners.length;
for (uint256 i = 0; i < length; ++i) {
if (owner == _owners[i]) {
++count;
}
}
delete length;
return count;
}
function ownerOf(uint256 tokenId)
public
view
virtual
override
returns (address)
{
address owner = _owners[tokenId];
require(
owner != address(0),
"ERC721: owner query for nonexistent token"
);
return owner;
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
function approve(address to, uint256 tokenId) public virtual override {
address owner = ERC721P.ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(
_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not owner nor approved for all"
);
_approve(to, tokenId);
}
function getApproved(uint256 tokenId)
public
view
virtual
override
returns (address)
{
require(
_exists(tokenId),
"ERC721: approved query for nonexistent token"
);
return _tokenApprovals[tokenId];
}
function setApprovalForAll(address operator, bool approved)
public
virtual
override
{
require(operator != _msgSender(), "ERC721: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
function isApprovedForAll(address owner, address operator)
public
view
virtual
override
returns (bool)
{
return _operatorApprovals[owner][operator];
}
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
//solhint-disable-next-line max-line-length
require(
_isApprovedOrOwner(_msgSender(), tokenId),
"ERC721: transfer caller is not owner nor approved"
);
_transfer(from, to, tokenId);
}
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public virtual override {
require(
_isApprovedOrOwner(_msgSender(), tokenId),
"ERC721: transfer caller is not owner nor approved"
);
_safeTransfer(from, to, tokenId, _data);
}
function _safeTransfer(
address from,
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_transfer(from, to, tokenId);
require(
_checkOnERC721Received(from, to, tokenId, _data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return tokenId < _owners.length && _owners[tokenId] != address(0);
}
function _isApprovedOrOwner(address spender, uint256 tokenId)
internal
view
virtual
returns (bool)
{
require(
_exists(tokenId),
"ERC721: operator query for nonexistent token"
);
address owner = ERC721P.ownerOf(tokenId);
return (spender == owner ||
getApproved(tokenId) == spender ||
isApprovedForAll(owner, spender));
}
function _safeMint(address to, uint256 tokenId) internal virtual {
_safeMint(to, tokenId, "");
}
function _safeMint(
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_mint(to, tokenId);
require(
_checkOnERC721Received(address(0), to, tokenId, _data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}
function _mint(address to, uint256 tokenId) internal virtual {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_beforeTokenTransfer(address(0), to, tokenId);
_owners.push(to);
emit Transfer(address(0), to, tokenId);
}
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721P.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
_owners[tokenId] = address(0);
emit Transfer(owner, address(0), tokenId);
}
function _transfer(
address from,
address to,
uint256 tokenId
) internal virtual {
require(
ERC721P.ownerOf(tokenId) == from,
"ERC721: transfer of token that is not own"
);
require(to != address(0), "ERC721: transfer to the zero address");
_beforeTokenTransfer(from, to, tokenId);
// Clear approvals from the previous owner
_approve(address(0), tokenId);
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
}
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721P.ownerOf(tokenId), to, tokenId);
}
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
if (to.isContract()) {
try
IERC721Receiver(to).onERC721Received(
_msgSender(),
from,
tokenId,
_data
)
returns (bytes4 retval) {
return retval == IERC721Receiver.onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert(
"ERC721: transfer to non ERC721Receiver implementer"
);
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Enumerable.sol)
pragma solidity ^0.8.0;
import "./IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Enumerable is IERC721 {
/**
* @dev Returns the total amount of tokens stored by the contract.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns a token ID owned by `owner` at a given `index` of its token list.
* Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
/**
* @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
* Use along with {totalSupply} to enumerate all tokens.
*/
function tokenByIndex(uint256 index) external view returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.0;
import "./IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Metadata is IERC721 {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721Receiver {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/MerkleProof.sol)
pragma solidity ^0.8.0;
/**
* @dev These functions deal with verification of Merkle Trees proofs.
*
* The proofs can be generated using the JavaScript library
* https://github.com/miguelmota/merkletreejs[merkletreejs].
* Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
*
* See `test/utils/cryptography/MerkleProof.test.js` for some examples.
*/
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 = _efficientHash(computedHash, proofElement);
} else {
// Hash(current element of the proof + current computed hash)
computedHash = _efficientHash(proofElement, computedHash);
}
}
return computedHash;
}
function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
assembly {
mstore(0x00, a)
mstore(0x20, b)
value := keccak256(0x00, 0x40)
}
}
}
// SPDX-License-Identifier: GPL-3.0
// HOFHOFHOFHOFHOFHOFHOFHOFHOFHOFHHOFHOFHOFHOF
// HOFHOFHOFHOF HOFHOFH HOFHOFHOFHOF
// HOFHOFHOFHOF HOFHF HOFHOFHOFHOF
// HOFHOFHOFHOF HOF HOFHOFHOFHOF
// HOFHOFHOFHOF HOFHOFH HOFHOFHOFHOF
// HOFHOFHOFHOF HOFHOFHOFHOF
// HOFHOFHOFHOF HOFHOFHOFHOF
// HOFHOFHOFHOF HOFHOFH HOFHOFHOFHOF
// HOFHOFHOFHOF HOFHOFH HOFHOFHOFHOF
// HOFHOFHOFHOF HOFHOFH HOFHOFHOFHOF
// HOFHOFHOFHOF HOFHOFH HOFHOFHOFHOF
// HOFHOFHOFHOFHOFHOFHOFHOFHOFHOFHHOFHOFHOFHOF
// ----------- House Of First -----------
// -- Metaverse Players - Butcher Billy --
pragma solidity ^0.8.10;
import "./ERC721Enum.sol";
import "./Ownable.sol";
import "./Strings.sol";
import "./ReentrancyGuard.sol";
import {MerkleProof} from "./MerkleProof.sol";
contract OwnableDelegateProxy {}
/**
* used to delegate ownership of a contract to another address, to save on unneeded transactions to approve contract use for users
*/
contract ProxyRegistry {
mapping(address => OwnableDelegateProxy) public proxies;
}
contract MetaversePlayers is ERC721Enum, Ownable, ReentrancyGuard {
using Strings for uint256;
using MerkleProof for bytes32[];
string public baseURI;
//sale settings
uint256 public SALE_START_TIMESTAMP = 1649894400; // time when sale starts - NOT FINAL VALUE - TBC
uint256 public SALE_END_TIMESTAMP = SALE_START_TIMESTAMP + (86400 * 10); // time when sale ends - NOT FINAL VALUE - TBC
uint256 public price = 0.06 ether; // NOT FINAL VALUE - TBC
uint256 public maxSupply = 10000; // NOT FINAL VALUE - TBC
uint256 public reserved = 300; // 300 NFTs reserved for vault - NOT FINAL VALUE - TBC
uint256 public maxPerTx = 10; // max per transaction - NOT FINAL VALUE - TBC
uint256 public ambassadorAllowance = 2; // max per ambassador
uint256 public allowancePerWallet = 5; // max mintable per wallet - NOT FINAL VALUE - TBC
mapping(address => uint256) public purchases; // mapping of mints per address
mapping(address => uint256) public ambassadorPurchases; // mapping of ambassador mints per address
bool public signatureMode = false; // enable allowlist minting via signature
bool public salePaused = false;
bool public enableAmbassadorSale = true;
bool public enableAllowlistSale = false;
bool public enablePublicSale = false;
// allowlist
address public constant ALLOWLIST_SIGNER = 0x303B711240cF0C4ec9903DF6410B904E0f8E67e9;
string _name = "Metaverse Players";
string _symbol = "MetaversePlayers";
string _initBaseURI = "https://houseoffirst.com:1335/metaverseplayers/opensea/";
bytes32 merkleRoot;
address public proxyRegistryAddress = 0xa5409ec958C83C3f309868babACA7c86DCB077c1; // OpenSea Mainnet Proxy Registry address
constructor() ERC721P(_name, _symbol) {
setBaseURI(_initBaseURI);
}
function _baseURI() internal view virtual returns (string memory) {
return baseURI;
}
function getPurchases(address addr) external view returns (uint256) {
return purchases[addr];
}
function getAmbassadorPurchases(address addr) external view returns (uint256) {
return ambassadorPurchases[addr];
}
function getTotalPurchases(address addr) external view returns (uint256) {
return purchases[addr] + ambassadorPurchases[addr];
}
function mintingHasStarted() public view returns (bool) {
return block.timestamp > SALE_START_TIMESTAMP;
}
function mintingHasEnded() public view returns (bool) {
return block.timestamp > SALE_END_TIMESTAMP;
}
function getMaxSupply() public view returns (uint256) {
return maxSupply;
}
function getAvailableMaxSupply() public view returns (uint256) {
return maxSupply - reserved;
}
function mintingIsActive() public view returns (bool) {
bool timeOk = mintingHasStarted() && !mintingHasEnded();
bool notSoldOut = _owners.length <= getAvailableMaxSupply();
return timeOk && notSoldOut;
}
function getAllowancePerWallet() public view returns (uint256) {
return allowancePerWallet;
}
function getNFTPrice() public view returns (uint256) {
return price;
}
/* allowlist */
function isAllowlisted(address user, bytes memory signature) public pure returns (bool) {
bytes32 messageHash = keccak256(abi.encodePacked(user));
bytes32 ethSignedMessageHash = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", messageHash));
return recoverSigner(ethSignedMessageHash, signature) == ALLOWLIST_SIGNER;
}
function recoverSigner(bytes32 _ethSignedMessageHash, bytes memory _signature) private pure returns (address) {
(bytes32 r, bytes32 s, uint8 v) = splitSignature(_signature);
return ecrecover(_ethSignedMessageHash, v, r, s);
}
function splitSignature(bytes memory sig) private pure returns (bytes32 r, bytes32 s, uint8 v) {
require(sig.length == 65, "invalid signature length");
assembly {
r := mload(add(sig, 32))
s := mload(add(sig, 64))
v := byte(0, mload(add(sig, 96)))
}
}
function _leaf(string memory allowance, string memory payload) internal pure returns (bytes32) {
return keccak256(abi.encodePacked(payload, allowance));
}
function _verify(bytes32 leaf, bytes32[] memory proof) internal view returns (bool) {
return MerkleProof.verify(proof, merkleRoot, leaf);
}
function getAllowance(string memory allowance, bytes32[] calldata proof) public view returns (string memory) {
string memory payload = string(abi.encodePacked(msg.sender));
require(_verify(_leaf(allowance, payload), proof), "Invalid Merkle Tree proof supplied.");
return allowance;
}
/**
* public mint nfts (no signature required)
*/
function mintNFT(uint256 numberOfNfts) public payable nonReentrant {
require(!salePaused && enablePublicSale, "Sale paused or public sale disabled");
require(block.timestamp > SALE_START_TIMESTAMP, "Sale has not started");
require(block.timestamp < SALE_END_TIMESTAMP, "Sale has ended");
uint256 s = _owners.length;
require(numberOfNfts > 0 && numberOfNfts <= maxPerTx, "Invalid numberOfNfts");
require((s + numberOfNfts) <= (maxSupply - reserved), "Exceeds Max Supply");
require(msg.value >= price * numberOfNfts, "Not Enough ETH");
require(purchases[msg.sender] + numberOfNfts <= allowancePerWallet, "Exceeds Allocation");
purchases[msg.sender] += numberOfNfts;
for (uint256 i = 0; i < numberOfNfts; ++i) {
_mint(msg.sender, s + i);
}
delete s;
}
/**
* allowlist mint nfts (signature required)
*/
function allowlistMintNFT(uint256 numberOfNfts, uint256 allowance, bytes32[] memory proof, bytes memory signature) public payable nonReentrant {
require(!salePaused && enableAllowlistSale, "Sale Paused");
require(block.timestamp > SALE_START_TIMESTAMP, "Sale has not started");
require(block.timestamp < SALE_END_TIMESTAMP, "Sale has ended");
require(msg.value >= price * numberOfNfts, "Not Enough ETH");
if(signatureMode) {
// use signature for allowlist validation
allowance = allowancePerWallet;
require(isAllowlisted(msg.sender, signature), "Address not allowlisted");
}
else {
// use merkle tree for allowlist validation
string memory payload = string(abi.encodePacked(msg.sender));
require(_verify(_leaf(Strings.toString(allowance), payload), proof), "Address not allowlisted");
delete payload;
}
uint256 s = _owners.length;
require(numberOfNfts > 0 && numberOfNfts <= maxPerTx, "Invalid numberOfNfts");
require((s + numberOfNfts) <= (maxSupply - reserved), "Exceeds Max Supply");
require(purchases[msg.sender] + numberOfNfts <= allowance, "Exceeds Allocation");
purchases[msg.sender] += numberOfNfts;
for (uint256 i = 0; i < numberOfNfts; ++i) {
_mint(msg.sender, s + i);
}
delete s;
}
/**
* ambassador mint nfts (signature required)
*/
function ambassadorMintNFT(uint256 numberOfNfts, bytes memory signature) public payable nonReentrant {
require(!salePaused && enableAmbassadorSale, "Sale Paused");
require(isAllowlisted(msg.sender, signature), "Address not allowlisted");
uint256 s = _owners.length;
require(numberOfNfts > 0 && numberOfNfts <= maxPerTx, "Invalid numberOfNfts");
require((s + numberOfNfts) <= (maxSupply - reserved), "Exceeds Max Supply");
require(ambassadorPurchases[msg.sender] + numberOfNfts <= ambassadorAllowance, "Exceeds Allocation");
ambassadorPurchases[msg.sender] += numberOfNfts;
for (uint256 i = 0; i < numberOfNfts; ++i) {
_mint(msg.sender, s + i);
}
delete s;
}
/**
* admin minting for reserved nfts (callable by Owner only)
*/
function giftNFT(uint256[] calldata quantity, address[] calldata recipient) external onlyOwner {
require(quantity.length == recipient.length, "Invalid quantities and recipients (length mismatch)");
uint256 totalQuantity = 0;
uint256 s = _owners.length;
for (uint256 i = 0; i < quantity.length; ++i) {
totalQuantity += quantity[i];
}
require(s + totalQuantity <= maxSupply, "Exceeds Max Supply");
require(totalQuantity <= reserved, "Exceeds Max Reserved");
// update remaining reserved count
reserved -= totalQuantity;
delete totalQuantity;
for (uint256 i = 0; i < recipient.length; ++i) {
for (uint256 j = 0; j < quantity[i]; ++j) {
_mint(recipient[i], s++);
}
}
delete s;
}
/**
* admin minting for reserved nfts - sets purchases[recipient] (callable by Owner only)
*/
function giftNFTPurchases(uint256[] calldata quantity, address[] calldata recipient) external onlyOwner {
require(quantity.length == recipient.length, "Invalid quantities and recipients (length mismatch)");
uint256 totalQuantity = 0;
uint256 s = _owners.length;
for (uint256 i = 0; i < quantity.length; ++i) {
totalQuantity += quantity[i];
}
require(s + totalQuantity <= maxSupply, "Exceeds Max Supply");
require(totalQuantity <= reserved, "Exceeds Max Reserved");
// update remaining reserved count
reserved -= totalQuantity;
delete totalQuantity;
for (uint256 i = 0; i < recipient.length; ++i) {
purchases[recipient[i]] += quantity[i];
for (uint256 j = 0; j < quantity[i]; ++j) {
_mint(recipient[i], s++);
}
}
delete s;
}
/**
* admin ambassador minting for reserved nfts (callable by Owner only)
*/
function airdropToAmbassador(uint256 quantity, address recipient) external onlyOwner {
require(ambassadorPurchases[recipient] + quantity <= ambassadorAllowance, "Exceeds ambassador allowance");
uint256 s = _owners.length;
require(s + quantity <= maxSupply, "Exceeds Max Supply");
require(quantity <= reserved, "Exceeds Max Reserved");
// update remaining reserved count
reserved -= quantity;
ambassadorPurchases[recipient] += quantity;
for (uint256 i = 0; i < quantity; ++i) {
_mint(recipient, s++);
}
delete s;
}
function _mint(address to, uint256 tokenId) internal virtual override {
_owners.push(to);
emit Transfer(address(0), to, tokenId);
}
function batchTransferFrom(address _from, address _to, uint256[] memory _tokenIds) public {
for (uint256 i = 0; i < _tokenIds.length; i++) {
transferFrom(_from, _to, _tokenIds[i]);
}
}
function multiTransfer(uint256[] calldata tokenIds, address[] calldata recipient) external onlyOwner {
require(tokenIds.length == recipient.length, "Invalid tokenIds and recipients (length mismatch)");
for (uint256 i = 0; i < recipient.length; ++i) {
for (uint256 j = 0; j < tokenIds[i]; ++j) {
transferFrom(msg.sender, recipient[i], tokenIds[i]);
}
}
}
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: Nonexistent token");
string memory currentBaseURI = _baseURI();
return bytes(currentBaseURI).length > 0 ? string(abi.encodePacked(currentBaseURI, tokenId.toString())) : "";
}
function setMerkleRoot(bytes32 root) public onlyOwner {
merkleRoot = root;
}
function setPurchases(address _addr, uint256 _purchases) public onlyOwner {
purchases[_addr] = _purchases;
}
function setAmbassadorPurchases(address _addr, uint256 _purchases) public onlyOwner {
ambassadorPurchases[_addr] = _purchases;
}
function setPrice(uint256 _newPrice) public onlyOwner {
price = _newPrice;
}
function setReserved(uint256 _reserved) public onlyOwner {
reserved = _reserved;
}
function setMaxPerTx(uint256 _maxPerTx) public onlyOwner {
maxPerTx = _maxPerTx;
}
function setAmbassadorAllowance(uint256 _newAllowance) public onlyOwner {
ambassadorAllowance = _newAllowance;
}
function setAllowancePerWallet(uint256 _allowancePerWallet) public onlyOwner {
allowancePerWallet = _allowancePerWallet;
}
function setMaxSupply(uint256 _newMaxSupply) public onlyOwner {
maxSupply = _newMaxSupply;
}
/**
* adjusts number of reserved nfts to psuedo limit supply (callable by Owner only)
* example: if maxSupply = 10000 & supplyCap = 4000 then set reserved = 6000 (maxSupply - supplyCap)
*/
function setSupplyCap(uint256 _supplyCap) public onlyOwner {
require(_supplyCap <= maxSupply, "Supply cap exceeds max supply");
reserved = maxSupply - _supplyCap;
}
function setBaseURI(string memory _newBaseURI) public onlyOwner {
baseURI = _newBaseURI;
}
function setSalePaused(bool _salePaused) public onlyOwner {
salePaused = _salePaused;
}
function setEnablePublicSale(bool _enablePublicSale) public onlyOwner {
enablePublicSale = _enablePublicSale;
}
function setEnableAllowlistSale(bool _enableAllowlistSale) public onlyOwner {
enableAllowlistSale = _enableAllowlistSale;
}
function setEnableAmbassadorSale(bool _enableAmbassadorSale) public onlyOwner {
enableAmbassadorSale = _enableAmbassadorSale;
}
function setSignatureMode(bool _mode) public onlyOwner {
signatureMode = _mode;
}
function setSaleStartTimestamp(uint256 _timestamp) public onlyOwner {
SALE_START_TIMESTAMP = _timestamp;
}
function setSaleEndTimestamp(uint256 _timestamp) public onlyOwner {
SALE_END_TIMESTAMP = _timestamp;
}
function setSaleStartEndTimestamp(uint256 _startTimestamp, uint256 _endTimestamp) public onlyOwner {
setSaleStartTimestamp(_startTimestamp);
setSaleEndTimestamp(_endTimestamp);
}
function setPhaseConfig(uint256 _startTimestamp, uint256 _endTimestamp, uint256 _maxPerTx, uint256 _allowancePerWallet, uint256 _supplyCap) public onlyOwner {
setSaleStartEndTimestamp(_startTimestamp, _endTimestamp);
setMaxPerTx(_maxPerTx);
setAllowancePerWallet(_allowancePerWallet);
setSupplyCap(_supplyCap);
}
// for transparency regarding ETH raised
uint256 totalWithdrawn = 0;
function getTotalWithdrawn() public view returns (uint256) {
return totalWithdrawn;
}
function getTotalBalance() public view returns (uint256) {
return address(this).balance;
}
function getTotalRaised() public view returns (uint256) {
return getTotalWithdrawn() + getTotalBalance();
}
/**
* withdraw ETH from the contract (callable by Owner only)
*/
function withdraw() public payable onlyOwner {
uint256 val = address(this).balance;
(bool success, ) = payable(msg.sender).call{
value: val
}("");
require(success);
totalWithdrawn += val;
delete val;
}
/**
* whitelist user's OpenSea proxy accounts to enable gas-less listings.
*/
function isApprovedForAll(address owner, address operator) override public view returns (bool) {
// whitelist opensea proxy contract for easy trading
ProxyRegistry proxyRegistry = ProxyRegistry(proxyRegistryAddress);
if (address(proxyRegistry.proxies(owner)) == operator) {
return true;
}
return super.isApprovedForAll(owner, operator);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "./Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_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);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (security/ReentrancyGuard.sol)
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 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;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0x00";
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
}