/**
*Submitted for verification at Etherscan.io on 2021-04-22
*/
// File: @openzeppelin/contracts/utils/Context.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN 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 payable) {
return payable(msg.sender);
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// File: @openzeppelin/contracts/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/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/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/IERC721Enumerable.sol
pragma solidity ^0.8.0;
/**
* @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);
}
// File: @openzeppelin/contracts/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/introspection/ERC165.sol
pragma solidity ^0.8.0;
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts may inherit from this and call {_registerInterface} to declare
* their support of an interface.
*/
abstract contract ERC165 is IERC165 {
/*
* bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
*/
bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
/**
* @dev Mapping of interface ids to whether or not it's supported.
*/
mapping(bytes4 => bool) private _supportedInterfaces;
constructor () internal {
// Derived contracts need only register support for their own interfaces,
// we register support for ERC165 itself here
_registerInterface(_INTERFACE_ID_ERC165);
}
/**
* @dev See {IERC165-supportsInterface}.
*
* Time complexity O(1), guaranteed to always use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return _supportedInterfaces[interfaceId];
}
/**
* @dev Registers the contract as an implementer of the interface defined by
* `interfaceId`. Support of the actual ERC165 interface is automatic and
* registering its interface id is not required.
*
* See {IERC165-supportsInterface}.
*
* Requirements:
*
* - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
*/
function _registerInterface(bytes4 interfaceId) internal virtual {
require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
_supportedInterfaces[interfaceId] = true;
}
}
// File: @openzeppelin/contracts/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;
// solhint-disable-next-line no-inline-assembly
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");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(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");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: value }(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// File: @openzeppelin/contracts/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/token/ERC721/ERC721.sol
pragma solidity ^0.8.0;
/**
* @title ERC721 Non-Fungible Token Standard basic implementation
* @dev see https://eips.ethereum.org/EIPS/eip-721
*/
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
//using EnumerableSet for EnumerableSet.UintSet;
//using EnumerableMap for EnumerableMap.UintToAddressMap;
using Strings for uint256;
// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
// which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
// Mapping from holder address to their (enumerable) set of owned tokens
//mapping (address => EnumerableSet.UintSet) private _holderTokens;
// Enumerable mapping from token ids to their owners
//EnumerableMap.UintToAddressMap private _tokenOwners;
// 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;
mapping (address => uint256) private tokenBalance;
mapping (uint256 => address) private tokenOwner;
mapping (uint256 => bool) private tokenExists;
uint256 public tokensMinted = 0;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Optional mapping for token URIs
//mapping (uint256 => string) private _tokenURIs;
// Base URI
string private _baseURI = "QmRXCkcUALpkZ7ympEfqyihcmHkpjqTvsuWCPqu4zLYy2H";
/*
* bytes4(keccak256('balanceOf(address)')) == 0x70a08231
* bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
* bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
* bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
* bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
* bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
* bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
* bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
* bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
*
* => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
* 0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
*/
bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;
/*
* bytes4(keccak256('name()')) == 0x06fdde03
* bytes4(keccak256('symbol()')) == 0x95d89b41
* bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
*
* => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
*/
bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;
/*
* bytes4(keccak256('totalSupply()')) == 0x18160ddd
* bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
* bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
*
* => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
*/
bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor (string memory name_, string memory symbol_) public {
_name = name_;
_symbol = symbol_;
// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(_INTERFACE_ID_ERC721);
_registerInterface(_INTERFACE_ID_ERC721_METADATA);
_registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
}
/**
* @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 _holderTokens[owner].length();
return tokenBalance[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
//return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
require(tokenId > 0, "ERC721: owner query for nonexistent token");
return tokenOwner[tokenId];
}
/**
* @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 _tokenURI = _tokenURIs[tokenId];
string memory base = baseURI();
// If there is no base URI, return the token URI.
/*if (bytes(base).length == 0) {
return _tokenURI;
}*/
// If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
/*if (bytes(_tokenURI).length > 0) {
return string(abi.encodePacked(base, _tokenURI));
}*/
// If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
return string(abi.encodePacked("ipfs://", base, "/", tokenId.toString()));
}
/**
* @dev Returns the base URI set via {_setBaseURI}. This will be
* automatically added as a prefix in {tokenURI} to each token's URI, or
* to the token ID if no specific URI is set for that token ID.
*/
function baseURI() public view virtual returns (string memory) {
return _baseURI;
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
*/
/*function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
return _holderTokens[owner].at(index);
}*/
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() public view virtual returns (uint256) {
// _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
//return _tokenOwners.length();
//return tokenBalance[];
return tokensMinted;
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
/*function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
(uint256 tokenId, ) = _tokenOwners.at(index);
return tokenId;
}*/
/**
* @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 || ERC721.isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not owner nor approved for all"
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual override {
require(operator != _msgSender(), "ERC721: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(address from, address to, uint256 tokenId) public virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_safeTransfer(from, to, tokenId, _data);
}
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* `_data` is additional data, it has no specified format and it is sent in call to `to`.
*
* This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted (`_mint`),
* and stop existing when they are burned (`_burn`).
*/
function _exists(uint256 tokenId) internal view virtual returns (bool) {
//return _tokenOwners.contains(tokenId);
return tokenExists[tokenId];
}
/**
* @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 || ERC721.isApprovedForAll(owner, spender));
}
/**
* @dev Safely mints `tokenId` and transfers it to `to`.
*
* Requirements:
d*
* - `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);
//_holderTokens[to].add(tokenId);
tokenOwner[tokenId] = to;
tokenExists[tokenId] = true;
//_tokenOwners.set(tokenId, to);
tokenBalance[to] = tokenBalance[to] + 1;
tokensMinted = tokensMinted + 1;
emit Transfer(address(0), to, tokenId);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/
/**
* @dev Transfers `tokenId` from `from` to `to`.
* As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
*
* Emits a {Transfer} event.
*/
function _transfer(address from, address to, uint256 tokenId) internal virtual {
require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); // internal 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);
tokenBalance[from]--;
tokenOwner[tokenId] = to;
tokenBalance[to]++;
emit Transfer(from, to, tokenId);
}
/**
* @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
/*function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
_tokenURIs[tokenId] = _tokenURI;
}*/
/**
* @dev Internal function to set the base URI for all token IDs. It is
* automatically added as a prefix to the value returned in {tokenURI},
* or to the token ID if {tokenURI} is empty.
*/
function _setBaseURI(string memory baseURI_) internal virtual {
_baseURI = baseURI_;
}
/**
* @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()) {
return true;
}
bytes memory returndata = to.functionCall(abi.encodeWithSelector(
IERC721Receiver(to).onERC721Received.selector,
_msgSender(),
from,
tokenId,
_data
), "ERC721: transfer to non ERC721Receiver implementer");
bytes4 retval = abi.decode(returndata, (bytes4));
return (retval == _ERC721_RECEIVED);
}
/**
* @dev Approve `to` to operate on `tokenId`
*
* Emits an {Approval} event.
*/
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId); // internal owner
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { }
}
// File: @openzeppelin/contracts/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 () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), 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 {
emit OwnershipTransferred(_owner, address(0));
_owner = 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");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}*/
}
pragma solidity ^0.8.0;
abstract contract wordleGame is Ownable, ERC721 {
struct GameDayStruct {
uint256 pot;
}
struct WithdrawStruct {
bool nft;
bool winnings;
}
struct GamerStruct {
uint roundsRemaining;
uint lastWithdrawDay;
}
mapping (address => GamerStruct) public gamers;
//mapping (uint256 => mapping (address => bool)) public withdrawn;
//mapping (uint256 => mapping (address => bool)) public allNFTwithdrawn;
mapping (uint256 => mapping (address => WithdrawStruct)) public withdrawn;
mapping (uint256 => GameDayStruct) public gameDay;
mapping (uint256 => uint256[]) public previousHash;
uint256[] public weights;
mapping (uint256 => mapping (uint => mapping (address => uint))) public winner;
mapping (uint256 => mapping (uint256 => uint256)) public winners;
mapping (uint256 => mapping (uint256 => uint256)) public roundWinners;
mapping (uint256 => mapping (address => bool)) public firstTry;
mapping (uint256 => mapping (uint256 => mapping (address => bool))) public recorded;
mapping (uint256 => mapping (uint256 => mapping (address => uint256))) public myWins;
mapping (uint256 => uint256) winnersOfDay;
mapping (uint256 => uint256) roundsOfDay;
uint256 public roundCount = 0;
uint256 public currentRound = 0;
uint256 public currentDay = 0;
bool public gameStarted = false;
uint256 public constant singleRoundPrice = 10000000000000000; //0.01 ETH
//uint256 public constant fullDayPrice = 180000000000000000; //0.14 ETH
uint256 public MAX_NWD;
function newRound(uint32[] memory prevHash, bool resetDay) public onlyOwner {
if (!gameStarted) {
gameStarted = true;
}
if (resetDay) {
currentRound = 0;
previousHash[currentDay] = prevHash;
currentDay = currentDay + 1;
}
currentRound = currentRound + 1;
roundsOfDay[currentDay] = roundsOfDay[currentDay] + 1;
}
function changeWeights(uint256[] memory newWeights) public onlyOwner {
require(newWeights.length == 5, "E30");
weights = newWeights;
}
function remaining(address checkAddress) public view returns (uint remRounds) {
if (gamers[checkAddress].roundsRemaining >= 1) {
return gamers[checkAddress].roundsRemaining;
} else {
return 0;
}
}
function buyRounds() public payable {
require(msg.value >= singleRoundPrice, "E01");
if (msg.value >= (singleRoundPrice * 24)) {
gamers[msg.sender].roundsRemaining = gamers[msg.sender].roundsRemaining + 24;
//if (firstTry[currentDay][msg.sender]) {
// gameDay[currentDay].pot = gameDay[currentDay].pot + (singleRoundPrice * 24);
//}
} else if (msg.value >= singleRoundPrice) {
gamers[msg.sender].roundsRemaining = gamers[msg.sender].roundsRemaining + 1;
//if (firstTry[currentDay][msg.sender]) {
// gameDay[currentDay].pot = gameDay[currentDay].pot + singleRoundPrice;
//}
}
}
function buyAndRecordWin(uint32 guessHash2) public payable {
uint256 guessHash = guessHash2;
require(gameStarted, "E90");
require(msg.value >= singleRoundPrice, "E01");
gamers[msg.sender].roundsRemaining = gamers[msg.sender].roundsRemaining + 1;
require(!recorded[currentDay][currentRound][msg.sender], "E91");
winner[guessHash][currentDay][msg.sender] = winner[guessHash][currentDay][msg.sender] + 1;
winners[guessHash][currentDay] = winners[guessHash][currentDay] + 1;
roundWinners[currentDay][currentRound] = roundWinners[currentDay][currentRound] + 1;
winnersOfDay[currentDay] = winnersOfDay[currentDay] + 1;
gamers[msg.sender].roundsRemaining = gamers[msg.sender].roundsRemaining - 1;
recorded[currentDay][currentRound][msg.sender] = true;
gameDay[currentDay].pot = gameDay[currentDay].pot + singleRoundPrice;
}
function recordWin(uint32 guessHash2) public {
uint256 guessHash = guessHash2;
require(gameStarted, "E90");
require(gamers[msg.sender].roundsRemaining > 0, "E17");
require(!recorded[currentDay][currentRound][msg.sender], "E91");
winner[guessHash][currentDay][msg.sender] = winner[guessHash][currentDay][msg.sender] + 1;
winners[guessHash][currentDay] = winners[guessHash][currentDay] + 1;
roundWinners[currentDay][currentRound] = roundWinners[currentDay][currentRound] + 1;
winnersOfDay[currentDay] = winnersOfDay[currentDay] + 1;
gamers[msg.sender].roundsRemaining = gamers[msg.sender].roundsRemaining - 1;
recorded[currentDay][currentRound][msg.sender] = true;
gameDay[currentDay].pot = gameDay[currentDay].pot + singleRoundPrice;
}
function earnings(uint8 isNFT, address whothis) public view returns (uint256 myBalance) {
require(gameStarted, "E90");
uint256 myAmount = 0;
require(currentDay > 1, "E05");
uint256 tempDay = gamers[whothis].lastWithdrawDay + 1;
uint256 totalWeight;
for (uint256 counter = 0; counter < weights.length; counter++) {
totalWeight = totalWeight + weights[counter];
}
for (uint256 withdrawDay = tempDay; withdrawDay < currentDay; withdrawDay++) {
if (isNFT == 1) {
require(!withdrawn[withdrawDay][whothis].nft, "E06");
require(balanceOf(whothis) > 0, "E95");
uint256 tokenCount = balanceOf(whothis);
require(tokenCount > 0, "E07");
uint256 supply = totalSupply();
myAmount = tokenCount * ((gameDay[withdrawDay].pot * 30) / 100) / supply;
} else {
//63%
for (uint256 counter = 0; counter < previousHash[withdrawDay].length; counter++) {
if (
winner[previousHash[withdrawDay][counter]][withdrawDay][whothis] > 0 &&
!withdrawn[withdrawDay][whothis].winnings
) {
myAmount = myAmount +
(
winner[previousHash[withdrawDay][counter]][withdrawDay][whothis]
*
(
weights[counter] *
((gameDay[withdrawDay].pot * 63) / 100)
/ totalWeight
)
/
winners[previousHash[withdrawDay][counter]][withdrawDay]
);
}
}
}
}
return myAmount;
}
function withdrawEarnings(uint8 isNFT, address whothis) public returns (uint256 myBalance) {
require(gameStarted, "E90");
require(whothis == msg.sender, "E97");
uint256 tempDay = gamers[msg.sender].lastWithdrawDay + 1;
if (currentDay == tempDay) {
return 0;
}
uint256 myAmount = earnings(isNFT, whothis);
if (myAmount <= 0) {
return 0;
}
for (uint256 withdrawDay = tempDay; withdrawDay < currentDay; withdrawDay++) {
if (isNFT == 1) {
withdrawn[withdrawDay][msg.sender].nft = true;
} else {
withdrawn[withdrawDay][msg.sender].winnings = true;
}
}
gamers[msg.sender].lastWithdrawDay = currentDay - 1;
payable(msg.sender).transfer(myAmount);
return myAmount;
}
}
pragma solidity ^0.8.0;
/*
* @title NFTWordle contract
*/
contract NFTWordle is wordleGame {
uint256 public NWDPrice = 50000000000000000; //0.05 ETH
//uint256 public constant NWDWhitelistPrice = 25000000000000000; //0.03 ETH
uint256 public constant maxNWDPurchase = 10;
uint256 public constant maxWLPurchase = 2;
bool public saleIsActive = false;
bool public wlState = false;
bool public ogState = false;
bool public noOGState = false;
uint256 public mintContrib;
struct OgStruct {
uint8 ogs;
uint8 wls;
}
uint16 public freeMints = 0;
mapping (address => OgStruct) public addies;
uint256 lastGRWithdraw;
constructor(string memory name, string memory symbol, uint256 maxNftSupply) ERC721(name, symbol) {
MAX_NWD = maxNftSupply;
weights = [10, 8, 4, 2, 1];
}
function gameWallet() public view returns (uint256 balance) {
//uint256 balance = address(this).balance;
uint256 tempDay = lastGRWithdraw + 1;
if (currentDay == tempDay) {
return 0;
}
uint256 totalAmount;
for (uint256 withdrawDay = tempDay; withdrawDay < currentDay; withdrawDay++) {
totalAmount = totalAmount + (gameDay[withdrawDay].pot * 7) / 100;
}
return totalAmount;
}
function potBalance(uint startingFrom) public view onlyOwner returns (uint256 balance) {
uint256 totalAmount;
for (uint256 withdrawDay = startingFrom; withdrawDay < currentDay; withdrawDay++) {
totalAmount = totalAmount + gameDay[withdrawDay].pot;
}
return totalAmount;
}
function withdraw(uint256 amount) public onlyOwner {
payable(msg.sender).transfer(amount);
}
function withdrawMintContrib() public onlyOwner {
payable(msg.sender).transfer(mintContrib);
}
function updateMintPrice(uint256 newPrice) public onlyOwner {
NWDPrice = newPrice;
}
/**
* Set some NWD aside
*/
function reserveNWD() public onlyOwner {
uint256 supply = totalSupply();
uint256 i;
for (i = 1; i < 10; i++) {
_safeMint(msg.sender, supply + i);
}
}
function setBaseURI(string memory baseURI) public onlyOwner {
_setBaseURI(baseURI);
}
/*
* Pause sale if active, make active if paused
*/
function flipState(uint8 sale) public onlyOwner {
if (sale == 1) {
saleIsActive = !saleIsActive;
if (saleIsActive) {
wlState = false;
}
}
if (sale == 2) {
wlState = !wlState;
}
if (sale == 3) {
ogState = !ogState;
}
if (sale == 4) {
noOGState = !noOGState;
}
}
function addAddresses(bool isOg, address[] memory addressList) public onlyOwner {
for (uint i = 0; i < addressList.length; i++) {
if (isOg) {
addies[addressList[i]].ogs = 1;
addies[addressList[i]].wls = 1;
} else {
addies[addressList[i]].wls = 1;
}
}
}
/**
* Mint free for OG
*/
function freeMint() public {
uint256 supply = totalSupply();
require(ogState, "E20");
require(addies[msg.sender].ogs == 1, "E21");
require(addies[msg.sender].ogs != 2, "E55");
require(supply < MAX_NWD, "E23");
addies[msg.sender].ogs = 2;
freeMints = freeMints + 1;
_safeMint(msg.sender, supply + 1);
}
/**
* Mints NWD
*/
function mintNWD(uint8 numberOfTokens) public payable {
uint256 delta = 0;
if (!noOGState) {
delta = 500 - freeMints;
}
uint256 supply = totalSupply();
require(numberOfTokens <= maxNWDPurchase, "E11");
require((supply + numberOfTokens) <= (MAX_NWD - delta), "E12");
if (addies[msg.sender].wls > 0 && addies[msg.sender].wls < (maxWLPurchase + 1)) {
require(wlState, "E30");
require(numberOfTokens <= (maxWLPurchase - (addies[msg.sender].wls - 1)), "E13");
//require(NWDWhitelistPrice * numberOfTokens <= msg.value, "E14");
require(NWDPrice * numberOfTokens <= msg.value, "E15");
addies[msg.sender].wls = addies[msg.sender].wls + numberOfTokens;
} else {
require(saleIsActive, "E10");
require(NWDPrice * numberOfTokens <= msg.value, "E15");
}
mintContrib = mintContrib + (NWDPrice * numberOfTokens);
for(uint256 i = 1; i <= numberOfTokens; i++) {
if (supply < (MAX_NWD - delta)) {
_safeMint(msg.sender, supply + i);
}
}
}
}
{
"compilationTarget": {
"NFTWordle.sol": "NFTWordle"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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