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/**
?*Submitted for verification at polygonscan.com on 2022-02-24
*/
// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/utils/Counters.sol
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)
pragma solidity ^0.8.0;
/**
?* @title Counters
?* @author Matt Condon (@shrugs)
?* @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
?* of elements in a mapping, issuing ERC721 ids, or counting request ids.
?*
?* Include with `using Counters for Counters.Counter;`
?*/
library Counters {
? ? struct Counter {
? ? ? ? // This variable should never be directly accessed by users of the library: interactions must be restricted to
? ? ? ? // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
? ? ? ? // this feature: see https://github.com/ethereum/solidity/issues/4637
? ? ? ? uint256 _value; // default: 0
? ? }
? ? function current(Counter storage counter) internal view returns (uint256) {
? ? ? ? return counter._value;
? ? }
? ? function increment(Counter storage counter) internal {
? ? ? ? unchecked {
? ? ? ? ? ? counter._value += 1;
? ? ? ? }
? ? }
? ? function decrement(Counter storage counter) internal {
? ? ? ? uint256 value = counter._value;
? ? ? ? require(value > 0, "Counter: decrement overflow");
? ? ? ? unchecked {
? ? ? ? ? ? counter._value = value - 1;
? ? ? ? }
? ? }
? ? function reset(Counter storage counter) internal {
? ? ? ? counter._value = 0;
? ? }
}
// 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: contracts/invisibleFriende.sol
// Amended by HashLips
/**
? ? !Disclaimer!
? ? These contracts have been used to create tutorials,
? ? and was created for the purpose to teach people
? ? how to create smart contracts on the blockchain.
? ? please review this code on your own before using any of
? ? the following code for production.
? ? The developer will not be responsible or liable for all loss or?
? ? damage whatsoever caused by you participating in any way in the?
? ? experimental code, whether putting money into the contract or?
? ? using the code for your own project.
*/
pragma solidity >=0.7.0 <0.9.0;
contract invisibleFriende is ERC721, Ownable {
? using Strings for uint256;
? using Counters for Counters.Counter;
? Counters.Counter private supply;
? string public uriPrefix = "";
? string public uriSuffix = ".json";
? string public hiddenMetadataUri;
??
? uint256 public cost = 0.25 ether;
? uint256 public maxSupply = 5000;
? uint256 public maxMintAmountPerTx = 2;
? bool public paused = true;
? bool public revealed = false;
? constructor() ERC721("Invisible Friende", "INVSBLE") {
? ? setHiddenMetadataUri("ipfs://QmPva2rFAN5L3rhTARhxSYSSi4BR9cPXqrfycjqMT3raJy/hidden.json");
? }
? modifier mintCompliance(uint256 _mintAmount) {
? ? require(_mintAmount > 0 && _mintAmount <= maxMintAmountPerTx, "Invalid mint amount!");
? ? require(supply.current() + _mintAmount <= maxSupply, "Max supply exceeded!");
? ? _;
? }
? function totalSupply() public view returns (uint256) {
? ? return supply.current();
? }
? function mint(uint256 _mintAmount) public payable mintCompliance(_mintAmount) {
? ? require(!paused, "The contract is paused!");
? ? require(msg.value >= cost * _mintAmount, "Insufficient funds!");
? ? _mintLoop(msg.sender, _mintAmount);
? }
??
? function mintForAddress(uint256 _mintAmount, address _receiver) public mintCompliance(_mintAmount) onlyOwner {
? ? _mintLoop(_receiver, _mintAmount);
? }
? function walletOfOwner(address _owner)
? ? public
? ? view
? ? returns (uint256[] memory)
? {
? ? uint256 ownerTokenCount = balanceOf(_owner);
? ? uint256[] memory ownedTokenIds = new uint256[](ownerTokenCount);
? ? uint256 currentTokenId = 1;
? ? uint256 ownedTokenIndex = 0;
? ? while (ownedTokenIndex < ownerTokenCount && currentTokenId <= maxSupply) {
? ? ? address currentTokenOwner = ownerOf(currentTokenId);
? ? ? if (currentTokenOwner == _owner) {
? ? ? ? ownedTokenIds[ownedTokenIndex] = currentTokenId;
? ? ? ? ownedTokenIndex++;
? ? ? }
? ? ? currentTokenId++;
? ? }
? ? return ownedTokenIds;
? }
? function tokenURI(uint256 _tokenId)
? ? public
? ? view
? ? virtual
? ? override
? ? returns (string memory)
? {
? ? require(
? ? ? _exists(_tokenId),
? ? ? "ERC721Metadata: URI query for nonexistent token"
? ? );
? ? if (revealed == false) {
? ? ? return hiddenMetadataUri;
? ? }
? ? string memory currentBaseURI = _baseURI();
? ? return bytes(currentBaseURI).length > 0
? ? ? ? ? string(abi.encodePacked(currentBaseURI, _tokenId.toString(), uriSuffix))
? ? ? ? : "";
? }
? function setRevealed(bool _state) public onlyOwner {
? ? revealed = _state;
? }
? function setCost(uint256 _cost) public onlyOwner {
? ? cost = _cost;
? }
? function setMaxMintAmountPerTx(uint256 _maxMintAmountPerTx) public onlyOwner {
? ? maxMintAmountPerTx = _maxMintAmountPerTx;
? }
? function setHiddenMetadataUri(string memory _hiddenMetadataUri) public onlyOwner {
? ? hiddenMetadataUri = _hiddenMetadataUri;
? }
? function setUriPrefix(string memory _uriPrefix) public onlyOwner {
? ? uriPrefix = _uriPrefix;
? }
? function setUriSuffix(string memory _uriSuffix) public onlyOwner {
? ? uriSuffix = _uriSuffix;
? }
? function setPaused(bool _state) public onlyOwner {
? ? paused = _state;
? }
? function withdraw() public onlyOwner {
? ? // This will pay HashLips 5% of the initial sale.
? ? // You can remove this if you want, or keep it in to support HashLips and his channel.
? ? // =============================================================================
? ? (bool hs, ) = payable(0x943590A42C27D08e3744202c4Ae5eD55c2dE240D).call{value: address(this).balance * 5 / 100}("");
? ? require(hs);
? ? // =============================================================================
? ? // This will transfer the remaining contract balance to the owner.
? ? // Do not remove this otherwise you will not be able to withdraw the funds.
? ? // =============================================================================
? ? (bool os, ) = payable(owner()).call{value: address(this).balance}("");
? ? require(os);
? ? // =============================================================================
? }
? function _mintLoop(address _receiver, uint256 _mintAmount) internal {
? ? for (uint256 i = 0; i < _mintAmount; i++) {
? ? ? supply.increment();
? ? ? _safeMint(_receiver, supply.current());
? ? }
? }
? function _baseURI() internal view virtual override returns (string memory) {
? ? return uriPrefix;
? }
}
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