Contract Name:
IBISChessclub
Contract Source Code:
File 1 of 1 : IBISChessclub
// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/utils/cryptography/MerkleProof.sol
// 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)
}
}
}
// File: @openzeppelin/contracts/utils/Strings.sol
// OpenZeppelin Contracts v4.4.1 (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);
}
}
// File: @openzeppelin/contracts/utils/Context.sol
// OpenZeppelin Contracts v4.4.1 (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;
}
}
// File: @openzeppelin/contracts/access/Ownable.sol
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
/**
* @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);
}
}
// File: @openzeppelin/contracts/utils/Address.sol
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @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
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 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);
}
}
}
}
// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol
// OpenZeppelin Contracts v4.4.1 (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);
}
// File: @openzeppelin/contracts/utils/introspection/IERC165.sol
// OpenZeppelin Contracts v4.4.1 (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);
}
// File: @openzeppelin/contracts/utils/introspection/ERC165.sol
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
/**
* @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;
}
}
// File: @openzeppelin/contracts/token/ERC721/IERC721.sol
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
/**
* @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;
}
// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.0;
/**
* @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);
}
// File: @openzeppelin/contracts/token/ERC721/ERC721.sol
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/ERC721.sol)
pragma solidity ^0.8.0;
/**
* @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 {
_setApprovalForAll(_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);
_afterTokenTransfer(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);
_afterTokenTransfer(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 from incorrect owner");
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);
_afterTokenTransfer(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 Approve `operator` to operate on all of `owner` tokens
*
* Emits a {ApprovalForAll} event.
*/
function _setApprovalForAll(
address owner,
address operator,
bool approved
) internal virtual {
require(owner != operator, "ERC721: approve to caller");
_operatorApprovals[owner][operator] = approved;
emit ApprovalForAll(owner, operator, approved);
}
/**
* @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 {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
}
// File: IBISChessclub.sol
pragma solidity ^0.8.7;
abstract contract CATS {
function balanceOf(address owner) external virtual view returns (uint256 balance);
}
abstract contract FLS {
function balanceOf(address owner) external virtual view returns (uint256 balance);
}
contract IBISChessclub is ERC721, Ownable {
CATS private cats;
FLS private fls;
using Strings for uint256;
address catsAdress = 0x568a1f8554Edcea5CB5F94E463ac69A9C49c0A2d;
address flsAddress = 0xf11B3a52e636dD04aa740cC97C5813CAAb0b75d0;
uint256 public firstPawnId = 382;
uint256 public firstKnightId = 748;
uint256 public firstBishopId = 1196;
uint256 public firstRookId = 1617;
uint256 public firstQueenId = 2053;
uint256 public firstKingId = 2517;
uint256 public firstSpecialId = 2967;
uint256 public MAX_SUPPLY_PAWNS = 366;
uint256 public MAX_SUPPLY_KNIGHTS = 448;
uint256 public MAX_SUPPLY_BISHOPS = 421;
uint256 public MAX_SUPPLY_ROOKS = 436;
uint256 public MAX_SUPPLY_QUEENS = 464;
uint256 public MAX_SUPPLY_KINGS = 450;
uint256 public MAX_SUPPLY_SPECIAL = 175;
uint256 public numSpecial = 0;
uint256 public numKings = 0;
uint256 public numQueens = 0;
uint256 public numRooks = 0;
uint256 public numBishops = 0;
uint256 public numKnights = 0;
uint256 public numPawns = 0;
uint256 public pawnPrice = 31400000000000000;
uint256 public knightPrice = 42000000000000000;
uint256 public bishopPrice = 69000000000000000;
uint256 public rookPrice = 89000000000000000;
uint256 public queenPrice = 111100000000000000;
uint256 public kingPrice = 130000000000000000;
uint256 public specialPrice = 210000000000000000;
uint256 public saleState = 0; // 0 = no sale, 1 = freemint, 2 = presale, 3 = public sale
string private baseURI;
bytes32 public freeMintRoot = 0x2b97f8602f78fbab8ac7bb9fef77d88b04f5c2b152c727328ced917ffae3ca13;
bytes32 public whitelistRoot;
mapping(address => uint256) public whiteListTx;
mapping(address => uint256) public freemintTx;
enum ChessPiece { Pawn, Knight, Bishop, Rook, Queen, King, Special }
constructor() ERC721("Ibis Chess Club", "IBIS") {
baseURI = "http://ibis.mintthepieces.com/metadata/";
cats = CATS(catsAdress);
fls = FLS(flsAddress);
}
function setSaleStatus(uint256 _saleState) external onlyOwner { // 0 = no sale, 1 = freemint, 2 = presale, 3 = public sale
require(_saleState >= 0 && _saleState < 4, "No such sale state");
saleState = _saleState;
}
function getPiecePrices() external view returns(uint256[7] memory prices) {
return [pawnPrice, knightPrice, bishopPrice, rookPrice, queenPrice, kingPrice, specialPrice];
}
function reservePieces(uint256 amount) external onlyOwner {
uint256 nonce = 0;
uint256 rand;
for (uint256 i = 0; i < amount; i++) {
rand = uint256(keccak256(abi.encodePacked(block.timestamp, msg.sender, nonce))) % 100;
if (rand < 14) {
// pawn
randomMintPiece(ChessPiece.Pawn, 1);
} else if (rand < 29) {
// knight
randomMintPiece(ChessPiece.Knight, 1);
} else if (rand < 44) {
// bishop
randomMintPiece(ChessPiece.Bishop, 1);
} else if (rand < 60) {
// rook
randomMintPiece(ChessPiece.Rook, 1);
} else if (rand < 78) {
// queen
randomMintPiece(ChessPiece.Queen, 1);
} else if (rand < 93) {
// king
randomMintPiece(ChessPiece.King, 1);
} else {
// special
randomMintPiece(ChessPiece.Special, 1);
}
nonce++;
}
}
function setPiecePrices(uint256[] calldata prices) external onlyOwner {
require(prices.length == 7, "Wrong number of parameters given");
if (prices[0] > 0) {
pawnPrice = prices[0];
}
if (prices[1] > 0) {
knightPrice = prices[1];
}
if (prices[2] > 0) {
bishopPrice = prices[2];
}
if (prices[3] > 0) {
rookPrice = prices[3];
}
if (prices[4] > 0) {
queenPrice = prices[4];
}
if (prices[5] > 0) {
kingPrice = prices[5];
}
if (prices[6] > 0) {
kingPrice = prices[6];
}
}
function _baseURI() internal view override returns (string memory) {
return baseURI;
}
function tokenURI(uint256 tokenId) public override view returns (string memory) {
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString(), ".json")) : "";
}
// set new freemint root
function setFreeMintRoot(bytes32 _root) external onlyOwner {
freeMintRoot = _root;
}
// set new whitelist root
function setWhitelistRoot(bytes32 _root) external onlyOwner {
whitelistRoot = _root;
}
function setBaseURI(string memory uri) public onlyOwner {
baseURI = uri;
}
// emergency claim function if someone forgets to claim their free token
function ownerClaimToken(uint256 id) external onlyOwner {
require(!_exists(id), "Token already exists");
_safeMint(msg.sender, id);
}
function freeClaimMint(bytes32[] calldata proof, uint256[] calldata tokenIds) external {
require(saleState == 1, "Free claim not available right now");
require(freemintTx[msg.sender] == 0, "Already claimed your tokens");
bytes32 node = keccak256(abi.encodePacked(msg.sender));
require(MerkleProof.verify(proof, freeMintRoot, node), "Address is not available for free claim mint");
for (uint256 i = 0; i < tokenIds.length; i++) {
require(!_exists(tokenIds[i]), "Token already claimed");
}
freemintTx[msg.sender] = 1;
for (uint256 i = 0; i < tokenIds.length; i++) {
_safeMint(msg.sender, tokenIds[i]);
}
}
function whitelistMint(bytes32[] calldata proof, uint256 typeId) external payable {
require(saleState == 2, "Whitelist minting closed");
require(whiteListTx[msg.sender] == 0, "Already have minted during presale");
require(hasEnoughTokensSingle(typeId), "Would exceed maximum supply of this piece");
require(checkValueOne(typeId, msg.value), "Incorrect value sent");
bytes32 node = keccak256(abi.encodePacked(msg.sender));
require(MerkleProof.verify(proof, whitelistRoot, node), "Address is not on whitelist");
whiteListTx[msg.sender] = 1;
randomMintPiece(ChessPiece(typeId), 1);
}
function mintFlsCats(uint256 typeId) external payable {
require(saleState == 2, "Whitelist minting closed");
require(whiteListTx[msg.sender] == 0, "Already have minted during presale");
require(hasEnoughTokensSingle(typeId), "Would exceed maximum supply of this piece");
require(checkValueOne(typeId, msg.value), "Incorrect value sent");
require(fls.balanceOf(msg.sender) > 0 || cats.balanceOf(msg.sender) > 0, "Address does not own a Stranger nor a Cat");
whiteListTx[msg.sender] = 1;
randomMintPiece(ChessPiece(typeId), 1);
}
function randomNumber(uint256 max, uint256 offset, uint256 nonce) private view returns(uint256) {
uint256 rand = uint256(keccak256(abi.encodePacked(block.timestamp, msg.sender, nonce))) % max + offset;
return rand;
}
function randomMintPiece(ChessPiece piece, uint256 amount) private {
uint256 index;
uint256 nonce = 0;
if (piece == ChessPiece.Pawn) {
for (uint256 i = 0; i < amount; i++) {
nonce = randomNumber(MAX_SUPPLY_PAWNS, firstPawnId, nonce);
index = randomNumber(MAX_SUPPLY_PAWNS, firstPawnId, nonce);
while (_exists(index)) {
nonce++;
index = randomNumber(MAX_SUPPLY_PAWNS, firstPawnId, nonce);
}
numPawns++;
_safeMint(msg.sender, index);
}
}
if (piece == ChessPiece.Knight) {
for (uint256 i = 0; i < amount; i++) {
nonce = randomNumber(MAX_SUPPLY_KNIGHTS, firstKnightId, nonce);
index = randomNumber(MAX_SUPPLY_KNIGHTS, firstKnightId, nonce);
while (_exists(index)) {
nonce++;
index = randomNumber(MAX_SUPPLY_KNIGHTS, firstKnightId, nonce);
}
numKnights++;
_safeMint(msg.sender, index);
}
}
if (piece == ChessPiece.Bishop) {
for (uint256 i = 0; i < amount; i++) {
nonce = randomNumber(MAX_SUPPLY_BISHOPS, firstBishopId, nonce);
index = randomNumber(MAX_SUPPLY_BISHOPS, firstBishopId, nonce);
while (_exists(index)) {
nonce++;
index = randomNumber(MAX_SUPPLY_BISHOPS, firstBishopId, nonce);
}
numBishops++;
_safeMint(msg.sender, index);
}
}
if (piece == ChessPiece.Rook) {
for (uint256 i = 0; i < amount; i++) {
nonce = randomNumber(MAX_SUPPLY_ROOKS, firstRookId, nonce);
index = randomNumber(MAX_SUPPLY_ROOKS, firstRookId, nonce);
while (_exists(index)) {
nonce++;
index = randomNumber(MAX_SUPPLY_ROOKS, firstRookId, nonce);
}
numRooks++;
_safeMint(msg.sender, index);
}
}
if (piece == ChessPiece.Queen) {
for (uint256 i = 0; i < amount; i++) {
nonce = randomNumber(MAX_SUPPLY_QUEENS, firstQueenId, nonce);
index = randomNumber(MAX_SUPPLY_QUEENS, firstQueenId, nonce);
while (_exists(index)) {
nonce++;
index = randomNumber(MAX_SUPPLY_QUEENS, firstQueenId, nonce);
}
numQueens++;
_safeMint(msg.sender, index);
}
}
if (piece == ChessPiece.King) {
for (uint256 i = 0; i < amount; i++) {
nonce = randomNumber(MAX_SUPPLY_KINGS, firstKingId, nonce);
index = randomNumber(MAX_SUPPLY_KINGS, firstKingId, nonce);
while (_exists(index)) {
nonce++;
index = randomNumber(MAX_SUPPLY_KINGS, firstKingId, nonce);
}
numKings++;
_safeMint(msg.sender, index);
}
}
if (piece == ChessPiece.Special) {
for (uint256 i = 0; i < amount; i++) {
nonce = randomNumber(MAX_SUPPLY_SPECIAL, firstSpecialId, nonce);
index = randomNumber(MAX_SUPPLY_SPECIAL, firstSpecialId, nonce);
while (_exists(index)) {
nonce++;
index = randomNumber(MAX_SUPPLY_SPECIAL, firstSpecialId, nonce);
}
numSpecial++;
_safeMint(msg.sender, index);
}
}
}
function hasEnoughTokensMultiple(uint256[] calldata ids) private view returns(bool) {
return ids[0] + numPawns <= MAX_SUPPLY_PAWNS
&& ids[1] + numKnights <= MAX_SUPPLY_KNIGHTS
&& ids[2] + numBishops <= MAX_SUPPLY_BISHOPS
&& ids[3] + numRooks <= MAX_SUPPLY_ROOKS
&& ids[4] + numQueens <= MAX_SUPPLY_QUEENS
&& ids[5] + numKings <= MAX_SUPPLY_KINGS
&& ids[6] + numSpecial <= MAX_SUPPLY_SPECIAL;
}
function hasEnoughTokensSingle(uint256 typeId) private view returns(bool) {
if (typeId == 0) {
return numPawns + 1 <= MAX_SUPPLY_PAWNS;
} else if (typeId == 1) {
return numKnights + 1 <= MAX_SUPPLY_KNIGHTS;
} else if (typeId == 2) {
return numBishops + 1 <= MAX_SUPPLY_BISHOPS;
} else if (typeId == 3) {
return numRooks + 1 <= MAX_SUPPLY_ROOKS;
} else if (typeId == 4) {
return numQueens + 1 <= MAX_SUPPLY_QUEENS;
} else if (typeId == 5) {
return numKings + 1 <= MAX_SUPPLY_KINGS;
} else {
return numSpecial + 1 <= MAX_SUPPLY_SPECIAL;
}
}
function checkValueMultiple(uint256[] calldata ids, uint256 value) private view returns(bool) {
uint256 price = (ids[0] * pawnPrice) + (ids[1] * knightPrice) + (ids[2] * bishopPrice) + (ids[3] * rookPrice) + (ids[4] * queenPrice) + (ids[5] * kingPrice) + (ids[6] * specialPrice);
return price == value;
}
function checkValueOne(uint256 typeId, uint256 value) private view returns(bool) {
uint256 price;
if (typeId == 0) {
price = pawnPrice;
} else if (typeId == 1) {
price = knightPrice;
} else if (typeId == 2) {
price = bishopPrice;
} else if (typeId == 3) {
price = rookPrice;
} else if (typeId == 4) {
price = queenPrice;
} else if (typeId == 5) {
price = kingPrice;
} else {
price = specialPrice;
}
return price == value;
}
function publicMint(uint256[] calldata ids) external payable {
require(saleState == 3, "Sale currently closed");
require(checkValueMultiple(ids, msg.value), "Incorrect value sent");
require(hasEnoughTokensMultiple(ids), "Order will exceed max number of tokens");
if (ids[0] > 0) {
randomMintPiece(ChessPiece.Pawn, ids[0]);
}
if (ids[1] > 0) {
randomMintPiece(ChessPiece.Knight, ids[1]);
}
if (ids[2] > 0) {
randomMintPiece(ChessPiece.Bishop, ids[2]);
}
if (ids[3] > 0) {
randomMintPiece(ChessPiece.Rook, ids[3]);
}
if (ids[4] > 0) {
randomMintPiece(ChessPiece.Queen, ids[4]);
}
if (ids[5] > 0) {
randomMintPiece(ChessPiece.King, ids[5]);
}
if (ids[6] > 0) {
randomMintPiece(ChessPiece.Special, ids[6]);
}
}
function withdraw() public onlyOwner {
uint256 balance = address(this).balance;
address acct = 0x88110386fC2e19C7aECb9Ed242E65d5eEd165EE0;
address studio = 0x388CcBf8c1A37F444DcFF6eDE0014DfA85BeDC1B;
uint256 acct_share = balance / 100 * 85;
uint256 studio_share = balance / 100 * 15;
payable(acct).transfer(acct_share);
payable(studio).transfer(studio_share);
}
function burn(uint256 tokenId) public virtual {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved");
_burn(tokenId);
}
}