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Contract Name:
XENStake
Compiler Version
v0.8.17+commit.8df45f5f
Contract Source Code (Solidity)
/**
*Submitted for verification at testnet.ftmscan.com on 2023-02-16
*/
// 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/token/ERC721/IERC721.sol
// OpenZeppelin Contracts (last updated v4.7.0) (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`.
*
* 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;
/**
* @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 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 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 the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @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);
}
// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721Receiver {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
// 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/utils/Address.sol
// OpenZeppelin Contracts (last updated v4.7.0) (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
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// 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/utils/Strings.sol
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
uint8 private constant _ADDRESS_LENGTH = 20;
/**
* @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);
}
/**
* @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
*/
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
}
}
// 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/ERC721.sol
// OpenZeppelin Contracts (last updated v4.7.0) (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: address zero is not a valid owner");
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: invalid token ID");
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) {
_requireMinted(tokenId);
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 overridden 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 token owner nor approved for all"
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual override returns (address) {
_requireMinted(tokenId);
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: caller is not token 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: caller is not token 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) {
address owner = ERC721.ownerOf(tokenId);
return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == 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 an {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 an {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 Reverts if the `tokenId` has not been minted yet.
*/
function _requireMinted(uint256 tokenId) internal view virtual {
require(_exists(tokenId), "ERC721: invalid token ID");
}
/**
* @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 {
/// @solidity memory-safe-assembly
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: @openzeppelin/contracts/interfaces/IERC2981.sol
// OpenZeppelin Contracts (last updated v4.6.0) (interfaces/IERC2981.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface for the NFT Royalty Standard.
*
* A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal
* support for royalty payments across all NFT marketplaces and ecosystem participants.
*
* _Available since v4.5._
*/
interface IERC2981 is IERC165 {
/**
* @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of
* exchange. The royalty amount is denominated and should be paid in that same unit of exchange.
*/
function royaltyInfo(uint256 tokenId, uint256 salePrice)
external
view
returns (address receiver, uint256 royaltyAmount);
}
// File: @openzeppelin/contracts/utils/Base64.sol
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Base64.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides a set of functions to operate with Base64 strings.
*
* _Available since v4.5._
*/
library Base64 {
/**
* @dev Base64 Encoding/Decoding Table
*/
string internal constant _TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/**
* @dev Converts a `bytes` to its Bytes64 `string` representation.
*/
function encode(bytes memory data) internal pure returns (string memory) {
/**
* Inspired by Brecht Devos (Brechtpd) implementation - MIT licence
* https://github.com/Brechtpd/base64/blob/e78d9fd951e7b0977ddca77d92dc85183770daf4/base64.sol
*/
if (data.length == 0) return "";
// Loads the table into memory
string memory table = _TABLE;
// Encoding takes 3 bytes chunks of binary data from `bytes` data parameter
// and split into 4 numbers of 6 bits.
// The final Base64 length should be `bytes` data length multiplied by 4/3 rounded up
// - `data.length + 2` -> Round up
// - `/ 3` -> Number of 3-bytes chunks
// - `4 *` -> 4 characters for each chunk
string memory result = new string(4 * ((data.length + 2) / 3));
/// @solidity memory-safe-assembly
assembly {
// Prepare the lookup table (skip the first "length" byte)
let tablePtr := add(table, 1)
// Prepare result pointer, jump over length
let resultPtr := add(result, 32)
// Run over the input, 3 bytes at a time
for {
let dataPtr := data
let endPtr := add(data, mload(data))
} lt(dataPtr, endPtr) {
} {
// Advance 3 bytes
dataPtr := add(dataPtr, 3)
let input := mload(dataPtr)
// To write each character, shift the 3 bytes (18 bits) chunk
// 4 times in blocks of 6 bits for each character (18, 12, 6, 0)
// and apply logical AND with 0x3F which is the number of
// the previous character in the ASCII table prior to the Base64 Table
// The result is then added to the table to get the character to write,
// and finally write it in the result pointer but with a left shift
// of 256 (1 byte) - 8 (1 ASCII char) = 248 bits
mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))
resultPtr := add(resultPtr, 1) // Advance
mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))
resultPtr := add(resultPtr, 1) // Advance
mstore8(resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F))))
resultPtr := add(resultPtr, 1) // Advance
mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F))))
resultPtr := add(resultPtr, 1) // Advance
}
// When data `bytes` is not exactly 3 bytes long
// it is padded with `=` characters at the end
switch mod(mload(data), 3)
case 1 {
mstore8(sub(resultPtr, 1), 0x3d)
mstore8(sub(resultPtr, 2), 0x3d)
}
case 2 {
mstore8(sub(resultPtr, 1), 0x3d)
}
}
return result;
}
}
// File: abdk-libraries-solidity/ABDKMath64x64.sol
/*
* ABDK Math 64.64 Smart Contract Library. Copyright © 2019 by ABDK Consulting.
* Author: Mikhail Vladimirov <[email protected]>
*/
pragma solidity ^0.8.0;
/**
* Smart contract library of mathematical functions operating with signed
* 64.64-bit fixed point numbers. Signed 64.64-bit fixed point number is
* basically a simple fraction whose numerator is signed 128-bit integer and
* denominator is 2^64. As long as denominator is always the same, there is no
* need to store it, thus in Solidity signed 64.64-bit fixed point numbers are
* represented by int128 type holding only the numerator.
*/
library ABDKMath64x64 {
/*
* Minimum value signed 64.64-bit fixed point number may have.
*/
int128 private constant MIN_64x64 = -0x80000000000000000000000000000000;
/*
* Maximum value signed 64.64-bit fixed point number may have.
*/
int128 private constant MAX_64x64 = 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
/**
* Convert signed 256-bit integer number into signed 64.64-bit fixed point
* number. Revert on overflow.
*
* @param x signed 256-bit integer number
* @return signed 64.64-bit fixed point number
*/
function fromInt (int256 x) internal pure returns (int128) {
unchecked {
require (x >= -0x8000000000000000 && x <= 0x7FFFFFFFFFFFFFFF);
return int128 (x << 64);
}
}
/**
* Convert signed 64.64 fixed point number into signed 64-bit integer number
* rounding down.
*
* @param x signed 64.64-bit fixed point number
* @return signed 64-bit integer number
*/
function toInt (int128 x) internal pure returns (int64) {
unchecked {
return int64 (x >> 64);
}
}
/**
* Convert unsigned 256-bit integer number into signed 64.64-bit fixed point
* number. Revert on overflow.
*
* @param x unsigned 256-bit integer number
* @return signed 64.64-bit fixed point number
*/
function fromUInt (uint256 x) internal pure returns (int128) {
unchecked {
require (x <= 0x7FFFFFFFFFFFFFFF);
return int128 (int256 (x << 64));
}
}
/**
* Convert signed 64.64 fixed point number into unsigned 64-bit integer
* number rounding down. Revert on underflow.
*
* @param x signed 64.64-bit fixed point number
* @return unsigned 64-bit integer number
*/
function toUInt (int128 x) internal pure returns (uint64) {
unchecked {
require (x >= 0);
return uint64 (uint128 (x >> 64));
}
}
/**
* Convert signed 128.128 fixed point number into signed 64.64-bit fixed point
* number rounding down. Revert on overflow.
*
* @param x signed 128.128-bin fixed point number
* @return signed 64.64-bit fixed point number
*/
function from128x128 (int256 x) internal pure returns (int128) {
unchecked {
int256 result = x >> 64;
require (result >= MIN_64x64 && result <= MAX_64x64);
return int128 (result);
}
}
/**
* Convert signed 64.64 fixed point number into signed 128.128 fixed point
* number.
*
* @param x signed 64.64-bit fixed point number
* @return signed 128.128 fixed point number
*/
function to128x128 (int128 x) internal pure returns (int256) {
unchecked {
return int256 (x) << 64;
}
}
/**
* Calculate x + y. Revert on overflow.
*
* @param x signed 64.64-bit fixed point number
* @param y signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function add (int128 x, int128 y) internal pure returns (int128) {
unchecked {
int256 result = int256(x) + y;
require (result >= MIN_64x64 && result <= MAX_64x64);
return int128 (result);
}
}
/**
* Calculate x - y. Revert on overflow.
*
* @param x signed 64.64-bit fixed point number
* @param y signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function sub (int128 x, int128 y) internal pure returns (int128) {
unchecked {
int256 result = int256(x) - y;
require (result >= MIN_64x64 && result <= MAX_64x64);
return int128 (result);
}
}
/**
* Calculate x * y rounding down. Revert on overflow.
*
* @param x signed 64.64-bit fixed point number
* @param y signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function mul (int128 x, int128 y) internal pure returns (int128) {
unchecked {
int256 result = int256(x) * y >> 64;
require (result >= MIN_64x64 && result <= MAX_64x64);
return int128 (result);
}
}
/**
* Calculate x * y rounding towards zero, where x is signed 64.64 fixed point
* number and y is signed 256-bit integer number. Revert on overflow.
*
* @param x signed 64.64 fixed point number
* @param y signed 256-bit integer number
* @return signed 256-bit integer number
*/
function muli (int128 x, int256 y) internal pure returns (int256) {
unchecked {
if (x == MIN_64x64) {
require (y >= -0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF &&
y <= 0x1000000000000000000000000000000000000000000000000);
return -y << 63;
} else {
bool negativeResult = false;
if (x < 0) {
x = -x;
negativeResult = true;
}
if (y < 0) {
y = -y; // We rely on overflow behavior here
negativeResult = !negativeResult;
}
uint256 absoluteResult = mulu (x, uint256 (y));
if (negativeResult) {
require (absoluteResult <=
0x8000000000000000000000000000000000000000000000000000000000000000);
return -int256 (absoluteResult); // We rely on overflow behavior here
} else {
require (absoluteResult <=
0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
return int256 (absoluteResult);
}
}
}
}
/**
* Calculate x * y rounding down, where x is signed 64.64 fixed point number
* and y is unsigned 256-bit integer number. Revert on overflow.
*
* @param x signed 64.64 fixed point number
* @param y unsigned 256-bit integer number
* @return unsigned 256-bit integer number
*/
function mulu (int128 x, uint256 y) internal pure returns (uint256) {
unchecked {
if (y == 0) return 0;
require (x >= 0);
uint256 lo = (uint256 (int256 (x)) * (y & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)) >> 64;
uint256 hi = uint256 (int256 (x)) * (y >> 128);
require (hi <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
hi <<= 64;
require (hi <=
0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF - lo);
return hi + lo;
}
}
/**
* Calculate x / y rounding towards zero. Revert on overflow or when y is
* zero.
*
* @param x signed 64.64-bit fixed point number
* @param y signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function div (int128 x, int128 y) internal pure returns (int128) {
unchecked {
require (y != 0);
int256 result = (int256 (x) << 64) / y;
require (result >= MIN_64x64 && result <= MAX_64x64);
return int128 (result);
}
}
/**
* Calculate x / y rounding towards zero, where x and y are signed 256-bit
* integer numbers. Revert on overflow or when y is zero.
*
* @param x signed 256-bit integer number
* @param y signed 256-bit integer number
* @return signed 64.64-bit fixed point number
*/
function divi (int256 x, int256 y) internal pure returns (int128) {
unchecked {
require (y != 0);
bool negativeResult = false;
if (x < 0) {
x = -x; // We rely on overflow behavior here
negativeResult = true;
}
if (y < 0) {
y = -y; // We rely on overflow behavior here
negativeResult = !negativeResult;
}
uint128 absoluteResult = divuu (uint256 (x), uint256 (y));
if (negativeResult) {
require (absoluteResult <= 0x80000000000000000000000000000000);
return -int128 (absoluteResult); // We rely on overflow behavior here
} else {
require (absoluteResult <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
return int128 (absoluteResult); // We rely on overflow behavior here
}
}
}
/**
* Calculate x / y rounding towards zero, where x and y are unsigned 256-bit
* integer numbers. Revert on overflow or when y is zero.
*
* @param x unsigned 256-bit integer number
* @param y unsigned 256-bit integer number
* @return signed 64.64-bit fixed point number
*/
function divu (uint256 x, uint256 y) internal pure returns (int128) {
unchecked {
require (y != 0);
uint128 result = divuu (x, y);
require (result <= uint128 (MAX_64x64));
return int128 (result);
}
}
/**
* Calculate -x. Revert on overflow.
*
* @param x signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function neg (int128 x) internal pure returns (int128) {
unchecked {
require (x != MIN_64x64);
return -x;
}
}
/**
* Calculate |x|. Revert on overflow.
*
* @param x signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function abs (int128 x) internal pure returns (int128) {
unchecked {
require (x != MIN_64x64);
return x < 0 ? -x : x;
}
}
/**
* Calculate 1 / x rounding towards zero. Revert on overflow or when x is
* zero.
*
* @param x signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function inv (int128 x) internal pure returns (int128) {
unchecked {
require (x != 0);
int256 result = int256 (0x100000000000000000000000000000000) / x;
require (result >= MIN_64x64 && result <= MAX_64x64);
return int128 (result);
}
}
/**
* Calculate arithmetics average of x and y, i.e. (x + y) / 2 rounding down.
*
* @param x signed 64.64-bit fixed point number
* @param y signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function avg (int128 x, int128 y) internal pure returns (int128) {
unchecked {
return int128 ((int256 (x) + int256 (y)) >> 1);
}
}
/**
* Calculate geometric average of x and y, i.e. sqrt (x * y) rounding down.
* Revert on overflow or in case x * y is negative.
*
* @param x signed 64.64-bit fixed point number
* @param y signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function gavg (int128 x, int128 y) internal pure returns (int128) {
unchecked {
int256 m = int256 (x) * int256 (y);
require (m >= 0);
require (m <
0x4000000000000000000000000000000000000000000000000000000000000000);
return int128 (sqrtu (uint256 (m)));
}
}
/**
* Calculate x^y assuming 0^0 is 1, where x is signed 64.64 fixed point number
* and y is unsigned 256-bit integer number. Revert on overflow.
*
* @param x signed 64.64-bit fixed point number
* @param y uint256 value
* @return signed 64.64-bit fixed point number
*/
function pow (int128 x, uint256 y) internal pure returns (int128) {
unchecked {
bool negative = x < 0 && y & 1 == 1;
uint256 absX = uint128 (x < 0 ? -x : x);
uint256 absResult;
absResult = 0x100000000000000000000000000000000;
if (absX <= 0x10000000000000000) {
absX <<= 63;
while (y != 0) {
if (y & 0x1 != 0) {
absResult = absResult * absX >> 127;
}
absX = absX * absX >> 127;
if (y & 0x2 != 0) {
absResult = absResult * absX >> 127;
}
absX = absX * absX >> 127;
if (y & 0x4 != 0) {
absResult = absResult * absX >> 127;
}
absX = absX * absX >> 127;
if (y & 0x8 != 0) {
absResult = absResult * absX >> 127;
}
absX = absX * absX >> 127;
y >>= 4;
}
absResult >>= 64;
} else {
uint256 absXShift = 63;
if (absX < 0x1000000000000000000000000) { absX <<= 32; absXShift -= 32; }
if (absX < 0x10000000000000000000000000000) { absX <<= 16; absXShift -= 16; }
if (absX < 0x1000000000000000000000000000000) { absX <<= 8; absXShift -= 8; }
if (absX < 0x10000000000000000000000000000000) { absX <<= 4; absXShift -= 4; }
if (absX < 0x40000000000000000000000000000000) { absX <<= 2; absXShift -= 2; }
if (absX < 0x80000000000000000000000000000000) { absX <<= 1; absXShift -= 1; }
uint256 resultShift = 0;
while (y != 0) {
require (absXShift < 64);
if (y & 0x1 != 0) {
absResult = absResult * absX >> 127;
resultShift += absXShift;
if (absResult > 0x100000000000000000000000000000000) {
absResult >>= 1;
resultShift += 1;
}
}
absX = absX * absX >> 127;
absXShift <<= 1;
if (absX >= 0x100000000000000000000000000000000) {
absX >>= 1;
absXShift += 1;
}
y >>= 1;
}
require (resultShift < 64);
absResult >>= 64 - resultShift;
}
int256 result = negative ? -int256 (absResult) : int256 (absResult);
require (result >= MIN_64x64 && result <= MAX_64x64);
return int128 (result);
}
}
/**
* Calculate sqrt (x) rounding down. Revert if x < 0.
*
* @param x signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function sqrt (int128 x) internal pure returns (int128) {
unchecked {
require (x >= 0);
return int128 (sqrtu (uint256 (int256 (x)) << 64));
}
}
/**
* Calculate binary logarithm of x. Revert if x <= 0.
*
* @param x signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function log_2 (int128 x) internal pure returns (int128) {
unchecked {
require (x > 0);
int256 msb = 0;
int256 xc = x;
if (xc >= 0x10000000000000000) { xc >>= 64; msb += 64; }
if (xc >= 0x100000000) { xc >>= 32; msb += 32; }
if (xc >= 0x10000) { xc >>= 16; msb += 16; }
if (xc >= 0x100) { xc >>= 8; msb += 8; }
if (xc >= 0x10) { xc >>= 4; msb += 4; }
if (xc >= 0x4) { xc >>= 2; msb += 2; }
if (xc >= 0x2) msb += 1; // No need to shift xc anymore
int256 result = msb - 64 << 64;
uint256 ux = uint256 (int256 (x)) << uint256 (127 - msb);
for (int256 bit = 0x8000000000000000; bit > 0; bit >>= 1) {
ux *= ux;
uint256 b = ux >> 255;
ux >>= 127 + b;
result += bit * int256 (b);
}
return int128 (result);
}
}
/**
* Calculate natural logarithm of x. Revert if x <= 0.
*
* @param x signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function ln (int128 x) internal pure returns (int128) {
unchecked {
require (x > 0);
return int128 (int256 (
uint256 (int256 (log_2 (x))) * 0xB17217F7D1CF79ABC9E3B39803F2F6AF >> 128));
}
}
/**
* Calculate binary exponent of x. Revert on overflow.
*
* @param x signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function exp_2 (int128 x) internal pure returns (int128) {
unchecked {
require (x < 0x400000000000000000); // Overflow
if (x < -0x400000000000000000) return 0; // Underflow
uint256 result = 0x80000000000000000000000000000000;
if (x & 0x8000000000000000 > 0)
result = result * 0x16A09E667F3BCC908B2FB1366EA957D3E >> 128;
if (x & 0x4000000000000000 > 0)
result = result * 0x1306FE0A31B7152DE8D5A46305C85EDEC >> 128;
if (x & 0x2000000000000000 > 0)
result = result * 0x1172B83C7D517ADCDF7C8C50EB14A791F >> 128;
if (x & 0x1000000000000000 > 0)
result = result * 0x10B5586CF9890F6298B92B71842A98363 >> 128;
if (x & 0x800000000000000 > 0)
result = result * 0x1059B0D31585743AE7C548EB68CA417FD >> 128;
if (x & 0x400000000000000 > 0)
result = result * 0x102C9A3E778060EE6F7CACA4F7A29BDE8 >> 128;
if (x & 0x200000000000000 > 0)
result = result * 0x10163DA9FB33356D84A66AE336DCDFA3F >> 128;
if (x & 0x100000000000000 > 0)
result = result * 0x100B1AFA5ABCBED6129AB13EC11DC9543 >> 128;
if (x & 0x80000000000000 > 0)
result = result * 0x10058C86DA1C09EA1FF19D294CF2F679B >> 128;
if (x & 0x40000000000000 > 0)
result = result * 0x1002C605E2E8CEC506D21BFC89A23A00F >> 128;
if (x & 0x20000000000000 > 0)
result = result * 0x100162F3904051FA128BCA9C55C31E5DF >> 128;
if (x & 0x10000000000000 > 0)
result = result * 0x1000B175EFFDC76BA38E31671CA939725 >> 128;
if (x & 0x8000000000000 > 0)
result = result * 0x100058BA01FB9F96D6CACD4B180917C3D >> 128;
if (x & 0x4000000000000 > 0)
result = result * 0x10002C5CC37DA9491D0985C348C68E7B3 >> 128;
if (x & 0x2000000000000 > 0)
result = result * 0x1000162E525EE054754457D5995292026 >> 128;
if (x & 0x1000000000000 > 0)
result = result * 0x10000B17255775C040618BF4A4ADE83FC >> 128;
if (x & 0x800000000000 > 0)
result = result * 0x1000058B91B5BC9AE2EED81E9B7D4CFAB >> 128;
if (x & 0x400000000000 > 0)
result = result * 0x100002C5C89D5EC6CA4D7C8ACC017B7C9 >> 128;
if (x & 0x200000000000 > 0)
result = result * 0x10000162E43F4F831060E02D839A9D16D >> 128;
if (x & 0x100000000000 > 0)
result = result * 0x100000B1721BCFC99D9F890EA06911763 >> 128;
if (x & 0x80000000000 > 0)
result = result * 0x10000058B90CF1E6D97F9CA14DBCC1628 >> 128;
if (x & 0x40000000000 > 0)
result = result * 0x1000002C5C863B73F016468F6BAC5CA2B >> 128;
if (x & 0x20000000000 > 0)
result = result * 0x100000162E430E5A18F6119E3C02282A5 >> 128;
if (x & 0x10000000000 > 0)
result = result * 0x1000000B1721835514B86E6D96EFD1BFE >> 128;
if (x & 0x8000000000 > 0)
result = result * 0x100000058B90C0B48C6BE5DF846C5B2EF >> 128;
if (x & 0x4000000000 > 0)
result = result * 0x10000002C5C8601CC6B9E94213C72737A >> 128;
if (x & 0x2000000000 > 0)
result = result * 0x1000000162E42FFF037DF38AA2B219F06 >> 128;
if (x & 0x1000000000 > 0)
result = result * 0x10000000B17217FBA9C739AA5819F44F9 >> 128;
if (x & 0x800000000 > 0)
result = result * 0x1000000058B90BFCDEE5ACD3C1CEDC823 >> 128;
if (x & 0x400000000 > 0)
result = result * 0x100000002C5C85FE31F35A6A30DA1BE50 >> 128;
if (x & 0x200000000 > 0)
result = result * 0x10000000162E42FF0999CE3541B9FFFCF >> 128;
if (x & 0x100000000 > 0)
result = result * 0x100000000B17217F80F4EF5AADDA45554 >> 128;
if (x & 0x80000000 > 0)
result = result * 0x10000000058B90BFBF8479BD5A81B51AD >> 128;
if (x & 0x40000000 > 0)
result = result * 0x1000000002C5C85FDF84BD62AE30A74CC >> 128;
if (x & 0x20000000 > 0)
result = result * 0x100000000162E42FEFB2FED257559BDAA >> 128;
if (x & 0x10000000 > 0)
result = result * 0x1000000000B17217F7D5A7716BBA4A9AE >> 128;
if (x & 0x8000000 > 0)
result = result * 0x100000000058B90BFBE9DDBAC5E109CCE >> 128;
if (x & 0x4000000 > 0)
result = result * 0x10000000002C5C85FDF4B15DE6F17EB0D >> 128;
if (x & 0x2000000 > 0)
result = result * 0x1000000000162E42FEFA494F1478FDE05 >> 128;
if (x & 0x1000000 > 0)
result = result * 0x10000000000B17217F7D20CF927C8E94C >> 128;
if (x & 0x800000 > 0)
result = result * 0x1000000000058B90BFBE8F71CB4E4B33D >> 128;
if (x & 0x400000 > 0)
result = result * 0x100000000002C5C85FDF477B662B26945 >> 128;
if (x & 0x200000 > 0)
result = result * 0x10000000000162E42FEFA3AE53369388C >> 128;
if (x & 0x100000 > 0)
result = result * 0x100000000000B17217F7D1D351A389D40 >> 128;
if (x & 0x80000 > 0)
result = result * 0x10000000000058B90BFBE8E8B2D3D4EDE >> 128;
if (x & 0x40000 > 0)
result = result * 0x1000000000002C5C85FDF4741BEA6E77E >> 128;
if (x & 0x20000 > 0)
result = result * 0x100000000000162E42FEFA39FE95583C2 >> 128;
if (x & 0x10000 > 0)
result = result * 0x1000000000000B17217F7D1CFB72B45E1 >> 128;
if (x & 0x8000 > 0)
result = result * 0x100000000000058B90BFBE8E7CC35C3F0 >> 128;
if (x & 0x4000 > 0)
result = result * 0x10000000000002C5C85FDF473E242EA38 >> 128;
if (x & 0x2000 > 0)
result = result * 0x1000000000000162E42FEFA39F02B772C >> 128;
if (x & 0x1000 > 0)
result = result * 0x10000000000000B17217F7D1CF7D83C1A >> 128;
if (x & 0x800 > 0)
result = result * 0x1000000000000058B90BFBE8E7BDCBE2E >> 128;
if (x & 0x400 > 0)
result = result * 0x100000000000002C5C85FDF473DEA871F >> 128;
if (x & 0x200 > 0)
result = result * 0x10000000000000162E42FEFA39EF44D91 >> 128;
if (x & 0x100 > 0)
result = result * 0x100000000000000B17217F7D1CF79E949 >> 128;
if (x & 0x80 > 0)
result = result * 0x10000000000000058B90BFBE8E7BCE544 >> 128;
if (x & 0x40 > 0)
result = result * 0x1000000000000002C5C85FDF473DE6ECA >> 128;
if (x & 0x20 > 0)
result = result * 0x100000000000000162E42FEFA39EF366F >> 128;
if (x & 0x10 > 0)
result = result * 0x1000000000000000B17217F7D1CF79AFA >> 128;
if (x & 0x8 > 0)
result = result * 0x100000000000000058B90BFBE8E7BCD6D >> 128;
if (x & 0x4 > 0)
result = result * 0x10000000000000002C5C85FDF473DE6B2 >> 128;
if (x & 0x2 > 0)
result = result * 0x1000000000000000162E42FEFA39EF358 >> 128;
if (x & 0x1 > 0)
result = result * 0x10000000000000000B17217F7D1CF79AB >> 128;
result >>= uint256 (int256 (63 - (x >> 64)));
require (result <= uint256 (int256 (MAX_64x64)));
return int128 (int256 (result));
}
}
/**
* Calculate natural exponent of x. Revert on overflow.
*
* @param x signed 64.64-bit fixed point number
* @return signed 64.64-bit fixed point number
*/
function exp (int128 x) internal pure returns (int128) {
unchecked {
require (x < 0x400000000000000000); // Overflow
if (x < -0x400000000000000000) return 0; // Underflow
return exp_2 (
int128 (int256 (x) * 0x171547652B82FE1777D0FFDA0D23A7D12 >> 128));
}
}
/**
* Calculate x / y rounding towards zero, where x and y are unsigned 256-bit
* integer numbers. Revert on overflow or when y is zero.
*
* @param x unsigned 256-bit integer number
* @param y unsigned 256-bit integer number
* @return unsigned 64.64-bit fixed point number
*/
function divuu (uint256 x, uint256 y) private pure returns (uint128) {
unchecked {
require (y != 0);
uint256 result;
if (x <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)
result = (x << 64) / y;
else {
uint256 msb = 192;
uint256 xc = x >> 192;
if (xc >= 0x100000000) { xc >>= 32; msb += 32; }
if (xc >= 0x10000) { xc >>= 16; msb += 16; }
if (xc >= 0x100) { xc >>= 8; msb += 8; }
if (xc >= 0x10) { xc >>= 4; msb += 4; }
if (xc >= 0x4) { xc >>= 2; msb += 2; }
if (xc >= 0x2) msb += 1; // No need to shift xc anymore
result = (x << 255 - msb) / ((y - 1 >> msb - 191) + 1);
require (result <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
uint256 hi = result * (y >> 128);
uint256 lo = result * (y & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
uint256 xh = x >> 192;
uint256 xl = x << 64;
if (xl < lo) xh -= 1;
xl -= lo; // We rely on overflow behavior here
lo = hi << 128;
if (xl < lo) xh -= 1;
xl -= lo; // We rely on overflow behavior here
assert (xh == hi >> 128);
result += xl / y;
}
require (result <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
return uint128 (result);
}
}
/**
* Calculate sqrt (x) rounding down, where x is unsigned 256-bit integer
* number.
*
* @param x unsigned 256-bit integer number
* @return unsigned 128-bit integer number
*/
function sqrtu (uint256 x) private pure returns (uint128) {
unchecked {
if (x == 0) return 0;
else {
uint256 xx = x;
uint256 r = 1;
if (xx >= 0x100000000000000000000000000000000) { xx >>= 128; r <<= 64; }
if (xx >= 0x10000000000000000) { xx >>= 64; r <<= 32; }
if (xx >= 0x100000000) { xx >>= 32; r <<= 16; }
if (xx >= 0x10000) { xx >>= 16; r <<= 8; }
if (xx >= 0x100) { xx >>= 8; r <<= 4; }
if (xx >= 0x10) { xx >>= 4; r <<= 2; }
if (xx >= 0x4) { r <<= 1; }
r = (r + x / r) >> 1;
r = (r + x / r) >> 1;
r = (r + x / r) >> 1;
r = (r + x / r) >> 1;
r = (r + x / r) >> 1;
r = (r + x / r) >> 1;
r = (r + x / r) >> 1; // Seven iterations should be enough
uint256 r1 = x / r;
return uint128 (r < r1 ? r : r1);
}
}
}
}
// File: @faircrypto/xen-crypto/contracts/Math.sol
pragma solidity ^0.8.10;
library Math {
function min(uint256 a, uint256 b) external pure returns (uint256) {
if (a > b) return b;
return a;
}
function max(uint256 a, uint256 b) external pure returns (uint256) {
if (a > b) return a;
return b;
}
function logX64(uint256 x) external pure returns (int128) {
return ABDKMath64x64.log_2(ABDKMath64x64.fromUInt(x));
}
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `from` to `to` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 amount
) external returns (bool);
}
// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// File: @openzeppelin/contracts/token/ERC20/ERC20.sol
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin Contracts guidelines: functions revert
* instead returning `false` on failure. This behavior is nonetheless
* conventional and does not conflict with the expectations of ERC20
* applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overridden;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
function transferFrom(
address from,
address to,
uint256 amount
) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + addedValue);
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `from` to `to`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
*/
function _transfer(
address from,
address to,
uint256 amount
) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
}
_balances[to] += amount;
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
}
_totalSupply -= amount;
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Updates `owner` s allowance for `spender` based on spent `amount`.
*
* Does not update the allowance amount in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Might emit an {Approval} event.
*/
function _spendAllowance(
address owner,
address spender,
uint256 amount
) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens 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 amount
) 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, `amount` of ``from``'s tokens
* has been transferred to `to`.
* - when `from` is zero, `amount` tokens have been minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
// File: @openzeppelin/contracts/interfaces/IERC165.sol
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC165.sol)
pragma solidity ^0.8.0;
// File: @faircrypto/xen-crypto/contracts/interfaces/IStakingToken.sol
pragma solidity ^0.8.10;
interface IStakingToken {
event Staked(address indexed user, uint256 amount, uint256 term);
event Withdrawn(address indexed user, uint256 amount, uint256 reward);
function stake(uint256 amount, uint256 term) external;
function withdraw() external;
}
// File: @faircrypto/xen-crypto/contracts/interfaces/IRankedMintingToken.sol
pragma solidity ^0.8.10;
interface IRankedMintingToken {
event RankClaimed(address indexed user, uint256 term, uint256 rank);
event MintClaimed(address indexed user, uint256 rewardAmount);
function claimRank(uint256 term) external;
function claimMintReward() external;
}
// File: @faircrypto/xen-crypto/contracts/interfaces/IBurnableToken.sol
pragma solidity ^0.8.10;
interface IBurnableToken {
function burn(address user, uint256 amount) external;
}
// File: @faircrypto/xen-crypto/contracts/interfaces/IBurnRedeemable.sol
pragma solidity ^0.8.10;
interface IBurnRedeemable {
event Redeemed(
address indexed user,
address indexed xenContract,
address indexed tokenContract,
uint256 xenAmount,
uint256 tokenAmount
);
function onTokenBurned(address user, uint256 amount) external;
}
// File: @faircrypto/xen-crypto/contracts/XENCrypto.sol
pragma solidity ^0.8.10;
contract XENCrypto is Context, IRankedMintingToken, IStakingToken, IBurnableToken, ERC20("XEN Crypto", "XEN") {
using Math for uint256;
using ABDKMath64x64 for int128;
using ABDKMath64x64 for uint256;
// INTERNAL TYPE TO DESCRIBE A XEN MINT INFO
struct MintInfo {
address user;
uint256 term;
uint256 maturityTs;
uint256 rank;
uint256 amplifier;
uint256 eaaRate;
}
// INTERNAL TYPE TO DESCRIBE A XEN STAKE
struct StakeInfo {
uint256 term;
uint256 maturityTs;
uint256 amount;
uint256 apy;
}
// PUBLIC CONSTANTS
uint256 public constant SECONDS_IN_DAY = 3_600 * 24;
uint256 public constant DAYS_IN_YEAR = 365;
uint256 public constant GENESIS_RANK = 1;
uint256 public constant MIN_TERM = 1 * SECONDS_IN_DAY - 1;
uint256 public constant MAX_TERM_START = 100 * SECONDS_IN_DAY;
uint256 public constant MAX_TERM_END = 1_000 * SECONDS_IN_DAY;
uint256 public constant TERM_AMPLIFIER = 15;
uint256 public constant TERM_AMPLIFIER_THRESHOLD = 5_000;
uint256 public constant REWARD_AMPLIFIER_START = 3_000;
uint256 public constant REWARD_AMPLIFIER_END = 1;
uint256 public constant EAA_PM_START = 100;
uint256 public constant EAA_PM_STEP = 1;
uint256 public constant EAA_RANK_STEP = 100_000;
uint256 public constant WITHDRAWAL_WINDOW_DAYS = 7;
uint256 public constant MAX_PENALTY_PCT = 99;
uint256 public constant XEN_MIN_STAKE = 0;
uint256 public constant XEN_MIN_BURN = 0;
uint256 public constant XEN_APY_START = 20;
uint256 public constant XEN_APY_DAYS_STEP = 90;
uint256 public constant XEN_APY_END = 2;
string public constant AUTHORS = "@MrJackLevin @lbelyaev faircrypto.org";
// PUBLIC STATE, READABLE VIA NAMESAKE GETTERS
uint256 public immutable genesisTs;
uint256 public globalRank = GENESIS_RANK;
uint256 public activeMinters;
uint256 public activeStakes;
uint256 public totalXenStaked;
// user address => XEN mint info
mapping(address => MintInfo) public userMints;
// user address => XEN stake info
mapping(address => StakeInfo) public userStakes;
// user address => XEN burn amount
mapping(address => uint256) public userBurns;
// CONSTRUCTOR
constructor() {
genesisTs = block.timestamp;
}
// PRIVATE METHODS
/**
* @dev calculates current MaxTerm based on Global Rank
* (if Global Rank crosses over TERM_AMPLIFIER_THRESHOLD)
*/
function _calculateMaxTerm() private view returns (uint256) {
if (globalRank > TERM_AMPLIFIER_THRESHOLD) {
uint256 delta = globalRank.fromUInt().log_2().mul(TERM_AMPLIFIER.fromUInt()).toUInt();
uint256 newMax = MAX_TERM_START + delta * SECONDS_IN_DAY;
return Math.min(newMax, MAX_TERM_END);
}
return MAX_TERM_START;
}
/**
* @dev calculates Withdrawal Penalty depending on lateness
*/
function _penalty(uint256 secsLate) private pure returns (uint256) {
// =MIN(2^(daysLate+3)/window-1,99)
uint256 daysLate = secsLate / SECONDS_IN_DAY;
if (daysLate > WITHDRAWAL_WINDOW_DAYS - 1) return MAX_PENALTY_PCT;
uint256 penalty = (uint256(1) << (daysLate + 3)) / WITHDRAWAL_WINDOW_DAYS - 1;
return Math.min(penalty, MAX_PENALTY_PCT);
}
/**
* @dev calculates net Mint Reward (adjusted for Penalty)
*/
function _calculateMintReward(
uint256 cRank,
uint256 term,
uint256 maturityTs,
uint256 amplifier,
uint256 eeaRate
) private view returns (uint256) {
uint256 secsLate = block.timestamp - maturityTs;
uint256 penalty = _penalty(secsLate);
uint256 rankDelta = Math.max(globalRank - cRank, 2);
uint256 EAA = (1_000 + eeaRate);
uint256 reward = getGrossReward(rankDelta, amplifier, term, EAA);
return (reward * (100 - penalty)) / 100;
}
/**
* @dev cleans up User Mint storage (gets some Gas credit;))
*/
function _cleanUpUserMint() private {
delete userMints[_msgSender()];
activeMinters--;
}
/**
* @dev calculates XEN Stake Reward
*/
function _calculateStakeReward(
uint256 amount,
uint256 term,
uint256 maturityTs,
uint256 apy
) private view returns (uint256) {
if (block.timestamp > maturityTs) {
uint256 rate = (apy * term * 1_000_000) / DAYS_IN_YEAR;
return (amount * rate) / 100_000_000;
}
return 0;
}
/**
* @dev calculates Reward Amplifier
*/
function _calculateRewardAmplifier() private view returns (uint256) {
uint256 amplifierDecrease = (block.timestamp - genesisTs) / SECONDS_IN_DAY;
if (amplifierDecrease < REWARD_AMPLIFIER_START) {
return Math.max(REWARD_AMPLIFIER_START - amplifierDecrease, REWARD_AMPLIFIER_END);
} else {
return REWARD_AMPLIFIER_END;
}
}
/**
* @dev calculates Early Adopter Amplifier Rate (in 1/000ths)
* actual EAA is (1_000 + EAAR) / 1_000
*/
function _calculateEAARate() private view returns (uint256) {
uint256 decrease = (EAA_PM_STEP * globalRank) / EAA_RANK_STEP;
if (decrease > EAA_PM_START) return 0;
return EAA_PM_START - decrease;
}
/**
* @dev calculates APY (in %)
*/
function _calculateAPY() private view returns (uint256) {
uint256 decrease = (block.timestamp - genesisTs) / (SECONDS_IN_DAY * XEN_APY_DAYS_STEP);
if (XEN_APY_START - XEN_APY_END < decrease) return XEN_APY_END;
return XEN_APY_START - decrease;
}
/**
* @dev creates User Stake
*/
function _createStake(uint256 amount, uint256 term) private {
userStakes[_msgSender()] = StakeInfo({
term: term,
maturityTs: block.timestamp + term * SECONDS_IN_DAY,
amount: amount,
apy: _calculateAPY()
});
activeStakes++;
totalXenStaked += amount;
}
// PUBLIC CONVENIENCE GETTERS
/**
* @dev calculates gross Mint Reward
*/
function getGrossReward(
uint256 rankDelta,
uint256 amplifier,
uint256 term,
uint256 eaa
) public pure returns (uint256) {
int128 log128 = rankDelta.fromUInt().log_2();
int128 reward128 = log128.mul(amplifier.fromUInt()).mul(term.fromUInt()).mul(eaa.fromUInt());
return reward128.div(uint256(1_000).fromUInt()).toUInt();
}
/**
* @dev returns User Mint object associated with User account address
*/
function getUserMint() external view returns (MintInfo memory) {
return userMints[_msgSender()];
}
/**
* @dev returns XEN Stake object associated with User account address
*/
function getUserStake() external view returns (StakeInfo memory) {
return userStakes[_msgSender()];
}
/**
* @dev returns current AMP
*/
function getCurrentAMP() external view returns (uint256) {
return _calculateRewardAmplifier();
}
/**
* @dev returns current EAA Rate
*/
function getCurrentEAAR() external view returns (uint256) {
return _calculateEAARate();
}
/**
* @dev returns current APY
*/
function getCurrentAPY() external view returns (uint256) {
return _calculateAPY();
}
/**
* @dev returns current MaxTerm
*/
function getCurrentMaxTerm() external view returns (uint256) {
return _calculateMaxTerm();
}
// PUBLIC STATE-CHANGING METHODS
/**
* @dev accepts User cRank claim provided all checks pass (incl. no current claim exists)
*/
function claimRank(uint256 term) external {
uint256 termSec = term * SECONDS_IN_DAY;
require(termSec > MIN_TERM, "CRank: Term less than min");
require(termSec < _calculateMaxTerm() + 1, "CRank: Term more than current max term");
require(userMints[_msgSender()].rank == 0, "CRank: Mint already in progress");
// create and store new MintInfo
MintInfo memory mintInfo = MintInfo({
user: _msgSender(),
term: term,
maturityTs: block.timestamp + termSec,
rank: globalRank,
amplifier: _calculateRewardAmplifier(),
eaaRate: _calculateEAARate()
});
userMints[_msgSender()] = mintInfo;
activeMinters++;
emit RankClaimed(_msgSender(), term, globalRank++);
}
/**
* @dev ends minting upon maturity (and within permitted Withdrawal Time Window), gets minted XEN
*/
function claimMintReward() external {
MintInfo memory mintInfo = userMints[_msgSender()];
require(mintInfo.rank > 0, "CRank: No mint exists");
require(block.timestamp > mintInfo.maturityTs, "CRank: Mint maturity not reached");
// calculate reward and mint tokens
uint256 rewardAmount = _calculateMintReward(
mintInfo.rank,
mintInfo.term,
mintInfo.maturityTs,
mintInfo.amplifier,
mintInfo.eaaRate
) * 1 ether;
_mint(_msgSender(), rewardAmount);
_cleanUpUserMint();
emit MintClaimed(_msgSender(), rewardAmount);
}
/**
* @dev ends minting upon maturity (and within permitted Withdrawal time Window)
* mints XEN coins and splits them between User and designated other address
*/
function claimMintRewardAndShare(address other, uint256 pct) external {
MintInfo memory mintInfo = userMints[_msgSender()];
require(other != address(0), "CRank: Cannot share with zero address");
require(pct > 0, "CRank: Cannot share zero percent");
require(pct < 101, "CRank: Cannot share 100+ percent");
require(mintInfo.rank > 0, "CRank: No mint exists");
require(block.timestamp > mintInfo.maturityTs, "CRank: Mint maturity not reached");
// calculate reward
uint256 rewardAmount = _calculateMintReward(
mintInfo.rank,
mintInfo.term,
mintInfo.maturityTs,
mintInfo.amplifier,
mintInfo.eaaRate
) * 1 ether;
uint256 sharedReward = (rewardAmount * pct) / 100;
uint256 ownReward = rewardAmount - sharedReward;
// mint reward tokens
_mint(_msgSender(), ownReward);
_mint(other, sharedReward);
_cleanUpUserMint();
emit MintClaimed(_msgSender(), rewardAmount);
}
/**
* @dev ends minting upon maturity (and within permitted Withdrawal time Window)
* mints XEN coins and stakes 'pct' of it for 'term'
*/
function claimMintRewardAndStake(uint256 pct, uint256 term) external {
MintInfo memory mintInfo = userMints[_msgSender()];
// require(pct > 0, "CRank: Cannot share zero percent");
require(pct < 101, "CRank: Cannot share >100 percent");
require(mintInfo.rank > 0, "CRank: No mint exists");
require(block.timestamp > mintInfo.maturityTs, "CRank: Mint maturity not reached");
// calculate reward
uint256 rewardAmount = _calculateMintReward(
mintInfo.rank,
mintInfo.term,
mintInfo.maturityTs,
mintInfo.amplifier,
mintInfo.eaaRate
) * 1 ether;
uint256 stakedReward = (rewardAmount * pct) / 100;
uint256 ownReward = rewardAmount - stakedReward;
// mint reward tokens part
_mint(_msgSender(), ownReward);
_cleanUpUserMint();
emit MintClaimed(_msgSender(), rewardAmount);
// nothing to burn since we haven't minted this part yet
// stake extra tokens part
require(stakedReward > XEN_MIN_STAKE, "XEN: Below min stake");
require(term * SECONDS_IN_DAY > MIN_TERM, "XEN: Below min stake term");
require(term * SECONDS_IN_DAY < MAX_TERM_END + 1, "XEN: Above max stake term");
require(userStakes[_msgSender()].amount == 0, "XEN: stake exists");
_createStake(stakedReward, term);
emit Staked(_msgSender(), stakedReward, term);
}
/**
* @dev initiates XEN Stake in amount for a term (days)
*/
function stake(uint256 amount, uint256 term) external {
require(balanceOf(_msgSender()) >= amount, "XEN: not enough balance");
require(amount > XEN_MIN_STAKE, "XEN: Below min stake");
require(term * SECONDS_IN_DAY > MIN_TERM, "XEN: Below min stake term");
require(term * SECONDS_IN_DAY < MAX_TERM_END + 1, "XEN: Above max stake term");
require(userStakes[_msgSender()].amount == 0, "XEN: stake exists");
// burn staked XEN
_burn(_msgSender(), amount);
// create XEN Stake
_createStake(amount, term);
emit Staked(_msgSender(), amount, term);
}
/**
* @dev ends XEN Stake and gets reward if the Stake is mature
*/
function withdraw() external {
StakeInfo memory userStake = userStakes[_msgSender()];
require(userStake.amount > 0, "XEN: no stake exists");
uint256 xenReward = _calculateStakeReward(
userStake.amount,
userStake.term,
userStake.maturityTs,
userStake.apy
);
activeStakes--;
totalXenStaked -= userStake.amount;
// mint staked XEN (+ reward)
_mint(_msgSender(), userStake.amount + xenReward);
emit Withdrawn(_msgSender(), userStake.amount, xenReward);
delete userStakes[_msgSender()];
}
/**
* @dev burns XEN tokens and creates Proof-Of-Burn record to be used by connected DeFi services
*/
function burn(address user, uint256 amount) public {
require(amount > XEN_MIN_BURN, "Burn: Below min limit");
require(
IERC165(_msgSender()).supportsInterface(type(IBurnRedeemable).interfaceId),
"Burn: not a supported contract"
);
_spendAllowance(user, _msgSender(), amount);
_burn(user, amount);
userBurns[user] += amount;
IBurnRedeemable(_msgSender()).onTokenBurned(user, amount);
}
}
// File: @faircrypto/magic-numbers/contracts/MagicNumbers.sol
pragma solidity ^0.8.10;
/*
\\ // ||||||||||| |\ || A CRYPTOCURRENCY FOR THE MASSES
\\ // || |\\ ||
\\ // || ||\\ || PRINCIPLES OF XEN:
\\// || || \\ || - No pre-mint; starts with zero supply
XX |||||||| || \\ || - No admin keys
//\\ || || \\ || - Immutable contract
// \\ || || \\||
// \\ || || \\|
// \\ ||||||||||| || \| Copyright (C) FairCrypto Foundation 2022-2023
*/
library MagicNumbers {
uint256 constant VERSION = 1;
string public constant AUTHORS = "@MrJackLevin @lbelyaev faircrypto.org";
// There's 370 fibs that fit in uint256 number
uint256 constant MAX_UINT256_FIB_IDX = 370;
// Max fib number that fits into uint256 size
uint256 constant MAX_UINT256_FIB = 94611056096305838013295371573764256526437182762229865607320618320601813254535;
// Max fib index supported by this Library
uint256 constant MAX_FIB_IDX = 90;
// Max number that could be safely tested by this Library
uint256 constant MAX_SUPPORTED_FIB_CANDIDATE = 2 ** 62 - 1;
/**
@dev First 60 Fibonacci numbers, which fit into uint64
*/
function fibs64() internal pure returns (uint64[60] memory) {
return [
uint64(0), 1, 1,
2, 3, 5,
8, 13, 21,
34, 55, 89,
144, 233, 377,
610, 987, 1597,
2584, 4181, 6765,
10946, 17711, 28657,
46368, 75025, 121393,
196418, 317811, 514229,
832040, 1346269, 2178309,
3524578, 5702887, 9227465,
14930352, 24157817, 39088169,
63245986, 102334155, 165580141,
267914296, 433494437, 701408733,
1134903170, 1836311903, 2971215073,
4807526976, 7778742049, 12586269025,
20365011074, 32951280099, 53316291173,
86267571272, 139583862445, 225851433717,
365435296162, 591286729879, 956722026041
];
}
/**
@dev Tests if number is a fib via a linear lookup in the table above
*/
function isFibs64(uint256 n) internal pure returns (bool) {
for(uint i = 0; i < 60; i++) if (fibs64()[i] == n) return true;
return false;
}
/**
@dev Next 38 Fibonacci numbers, which fit into uint128
*/
function fibs128() internal pure returns (uint128[39] memory) {
return [
uint128(1548008755920),2504730781961, 4052739537881,
6557470319842, 10610209857723, 17167680177565,
27777890035288, 44945570212853, 72723460248141,
117669030460994, 190392490709135, 308061521170129,
498454011879264, 806515533049393, 1304969544928657,
2111485077978050, 3416454622906707, 5527939700884757,
8944394323791464, 14472334024676221, 23416728348467685,
37889062373143906, 61305790721611591, 99194853094755497,
160500643816367088, 259695496911122585, 420196140727489673,
679891637638612258, 1100087778366101931, 1779979416004714189,
2880067194370816120, 4660046610375530309, 7540113804746346429,
12200160415121876738, 19740274219868223167, 31940434634990099905,
51680708854858323072, 83621143489848422977, 135301852344706746049
];
}
/**
@dev Tests if number is a fib via a linear lookup in the table above
*/
function isFibs128(uint256 n) internal pure returns (bool) {
for(uint i = 0; i < 39; i++) if (fibs128()[i] == n) return true;
return false;
}
/**
@dev Helper for Miller-Rabin probabilistic primality test
*/
// Write (n - 1) as 2^s * d
function getValues(uint256 n) internal pure returns (uint256[2] memory) {
uint256 s = 0;
uint256 d = n - 1;
while (d % 2 == 0) {
d = d / 2;
s++;
}
uint256[2] memory ret;
ret[0] = s;
ret[1] = d;
return ret;
}
/**
@dev Wrapper around EVM precompiled function for modular exponentiation, deployed at 0x05 address
*/
function modExp(uint256 base, uint256 e, uint256 m) internal view returns (uint o) {
assembly {
// define pointer
let p := mload(0x40)
// store data assembly-favouring ways
mstore(p, 0x20) // Length of Base
mstore(add(p, 0x20), 0x20) // Length of Exponent
mstore(add(p, 0x40), 0x20) // Length of Modulus
mstore(add(p, 0x60), base) // Base
mstore(add(p, 0x80), e) // Exponent
mstore(add(p, 0xa0), m) // Modulus
if iszero(staticcall(sub(gas(), 2000), 0x05, p, 0xc0, p, 0x20)) {
revert(0, 0)
}
// data
o := mload(p)
}
}
/**
@dev Miller-Rabin test probabilistic primality test
see https://en.wikipedia.org/wiki/Miller–Rabin_primality_test
*/
function probablyPrime(uint256 n, uint256 prime) internal view returns (bool) {
if (n == 2 || n == 3) {
return true;
}
if (n % 2 == 0 || n < 2) {
return false;
}
uint256[2] memory values = getValues(n);
uint256 s = values[0];
uint256 d = values[1];
uint256 x = modExp(prime, d, n);
if (x == 1 || x == n - 1) {
return true;
}
for (uint256 i = s - 1; i > 0; i--) {
x = modExp(x, 2, n);
if (x == 1) {
return false;
}
if (x == n - 1) {
return true;
}
}
return false;
}
/**
@dev Determines if a number is prime, using Miller-Rabin test probabilistic primality test
plus deterministic checking to sift out pseudo-primes
see https://en.wikipedia.org/wiki/Miller–Rabin_primality_test
*/
function isPrime(uint256 n) public view returns (bool) {
if (n < 2_047)
return probablyPrime(n, 2);
else if (n < 1_373_653)
return probablyPrime(n, 2) && probablyPrime(n, 3);
else if (n < 9_080_191)
return probablyPrime(n, 31) && probablyPrime(n, 73);
else if (n < 25_326_001)
return probablyPrime(n, 2) && probablyPrime(n, 3)
&& probablyPrime(n, 5);
else if (n < 3_215_031_751)
return probablyPrime(n, 2) && probablyPrime(n, 3)
&& probablyPrime(n, 5) && probablyPrime(n, 7);
else if (n < 4_759_123_141)
return probablyPrime(n, 2) && probablyPrime(n, 7)
&& probablyPrime(n, 61);
else if (n < 1_122_004_669_633)
return probablyPrime(n, 2) && probablyPrime(n, 13)
&& probablyPrime(n, 23) && probablyPrime(n, 1662803);
else if (n < 2_152_302_898_747)
return probablyPrime(n, 2) && probablyPrime(n, 3)
&& probablyPrime(n, 5) && probablyPrime(n, 7)
&& probablyPrime(n, 11);
else if (n < 3_474_749_660_383)
return probablyPrime(n, 2) && probablyPrime(n, 3)
&& probablyPrime(n, 5) && probablyPrime(n, 7)
&& probablyPrime(n, 11) && probablyPrime(n, 13);
else if (n < 341_550_071_728_321)
return probablyPrime(n, 2) && probablyPrime(n, 3)
&& probablyPrime(n, 5) && probablyPrime(n, 7)
&& probablyPrime(n, 11) && probablyPrime(n, 13)
&& probablyPrime(n, 17);
return false;
// TODO: consider reverting ???
// revert('number too big');
}
/**
@dev Count prime numbers occurring between `from` and `to` numbers
*/
function findPrimes(uint256 from, uint256 to) external view returns (uint256 count) {
require(to > 0, "findPrimes: to should be natural");
require(to > from, "findPrimes: to should be larger than from");
count = 0;
for(uint i = from; i < to; i++) {
if (isPrime(i)) count++;
}
}
/**
@dev Helper to get N-th Fibonacci number (0 returns 0)
*/
function getFib(uint256 n) internal pure returns (uint256 a) {
if (n == 0) {
return 0;
}
uint256 h = n / 2;
uint256 mask = 1;
// find highest set bit in n
while(mask <= h) {
mask <<= 1;
}
mask >>= 1;
a = 1;
uint256 b = 1;
uint256 c;
while(mask > 0) {
c = a * a+b * b;
if (n & mask > 0) {
b = b * (b + 2 * a);
a = c;
} else {
a = a * (2 * b - a);
b = c;
}
mask >>= 1;
}
return a;
}
/**
@dev Helper to check if a number is a perfect square
*/
function isPerfectSquare(uint256 n) internal pure returns (bool) {
uint256 low = 0;
uint256 high = n;
while (low <= high) {
uint mid = (low + high) / 2;
uint square = mid * mid;
if (square == n) {
return true;
} else if (square > n) {
high = mid - 1;
} else {
low = mid + 1;
}
}
return false;
}
/**
@dev Test if the number is a fib
note the upper limit of 2 ** 62 - 1, to avoid overflow while preforming tests
*/
function isFib(uint256 n) public pure returns (bool) {
if (n == 0) return false;
require(n < MAX_SUPPORTED_FIB_CANDIDATE, 'isFib: number too big');
uint256 base = n * n * 5;
uint256 p1 = base + 4;
uint256 p2 = base - 4;
return (isPerfectSquare(p1) || isPerfectSquare(p2));
}
}
// File: operator-filter-registry/src/IOperatorFilterRegistry.sol
pragma solidity ^0.8.13;
interface IOperatorFilterRegistry {
function isOperatorAllowed(address registrant, address operator) external view returns (bool);
function register(address registrant) external;
function registerAndSubscribe(address registrant, address subscription) external;
function registerAndCopyEntries(address registrant, address registrantToCopy) external;
function unregister(address addr) external;
function updateOperator(address registrant, address operator, bool filtered) external;
function updateOperators(address registrant, address[] calldata operators, bool filtered) external;
function updateCodeHash(address registrant, bytes32 codehash, bool filtered) external;
function updateCodeHashes(address registrant, bytes32[] calldata codeHashes, bool filtered) external;
function subscribe(address registrant, address registrantToSubscribe) external;
function unsubscribe(address registrant, bool copyExistingEntries) external;
function subscriptionOf(address addr) external returns (address registrant);
function subscribers(address registrant) external returns (address[] memory);
function subscriberAt(address registrant, uint256 index) external returns (address);
function copyEntriesOf(address registrant, address registrantToCopy) external;
function isOperatorFiltered(address registrant, address operator) external returns (bool);
function isCodeHashOfFiltered(address registrant, address operatorWithCode) external returns (bool);
function isCodeHashFiltered(address registrant, bytes32 codeHash) external returns (bool);
function filteredOperators(address addr) external returns (address[] memory);
function filteredCodeHashes(address addr) external returns (bytes32[] memory);
function filteredOperatorAt(address registrant, uint256 index) external returns (address);
function filteredCodeHashAt(address registrant, uint256 index) external returns (bytes32);
function isRegistered(address addr) external returns (bool);
function codeHashOf(address addr) external returns (bytes32);
}
// File: operator-filter-registry/src/OperatorFilterer.sol
pragma solidity ^0.8.13;
/**
* @title OperatorFilterer
* @notice Abstract contract whose constructor automatically registers and optionally subscribes to or copies another
* registrant's entries in the OperatorFilterRegistry.
* @dev This smart contract is meant to be inherited by token contracts so they can use the following:
* - `onlyAllowedOperator` modifier for `transferFrom` and `safeTransferFrom` methods.
* - `onlyAllowedOperatorApproval` modifier for `approve` and `setApprovalForAll` methods.
*/
abstract contract OperatorFilterer {
error OperatorNotAllowed(address operator);
IOperatorFilterRegistry public constant OPERATOR_FILTER_REGISTRY =
IOperatorFilterRegistry(0x000000000000AAeB6D7670E522A718067333cd4E);
constructor(address subscriptionOrRegistrantToCopy, bool subscribe) {
// If an inheriting token contract is deployed to a network without the registry deployed, the modifier
// will not revert, but the contract will need to be registered with the registry once it is deployed in
// order for the modifier to filter addresses.
if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
if (subscribe) {
OPERATOR_FILTER_REGISTRY.registerAndSubscribe(address(this), subscriptionOrRegistrantToCopy);
} else {
if (subscriptionOrRegistrantToCopy != address(0)) {
OPERATOR_FILTER_REGISTRY.registerAndCopyEntries(address(this), subscriptionOrRegistrantToCopy);
} else {
OPERATOR_FILTER_REGISTRY.register(address(this));
}
}
}
}
modifier onlyAllowedOperator(address from) virtual {
// Allow spending tokens from addresses with balance
// Note that this still allows listings and marketplaces with escrow to transfer tokens if transferred
// from an EOA.
if (from != msg.sender) {
_checkFilterOperator(msg.sender);
}
_;
}
modifier onlyAllowedOperatorApproval(address operator) virtual {
_checkFilterOperator(operator);
_;
}
function _checkFilterOperator(address operator) internal view virtual {
// Check registry code length to facilitate testing in environments without a deployed registry.
if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
if (!OPERATOR_FILTER_REGISTRY.isOperatorAllowed(address(this), operator)) {
revert OperatorNotAllowed(operator);
}
}
}
}
// File: operator-filter-registry/src/DefaultOperatorFilterer.sol
pragma solidity ^0.8.13;
/**
* @title DefaultOperatorFilterer
* @notice Inherits from OperatorFilterer and automatically subscribes to the default OpenSea subscription.
*/
abstract contract DefaultOperatorFilterer is OperatorFilterer {
address constant DEFAULT_SUBSCRIPTION = address(0x3cc6CddA760b79bAfa08dF41ECFA224f810dCeB6);
constructor() OperatorFilterer(DEFAULT_SUBSCRIPTION, true) {}
}
// File: contracts/libs/ERC2771Context.sol
// OpenZeppelin Contracts (last updated v4.7.0) (metatx/ERC2771Context.sol)
pragma solidity ^0.8.10;
/**
* @dev Context variant with ERC2771 support.
*/
abstract contract ERC2771Context is Context {
/// @custom:oz-upgrades-unsafe-allow state-variable-immutable
// one-time settable var
address internal _trustedForwarder;
/// @custom:oz-upgrades-unsafe-allow constructor
constructor(address trustedForwarder) {
_trustedForwarder = trustedForwarder;
}
function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
return forwarder == _trustedForwarder;
}
function _msgSender() internal view virtual override returns (address sender) {
if (isTrustedForwarder(msg.sender)) {
// The assembly code is more direct than the Solidity version using `abi.decode`.
/// @solidity memory-safe-assembly
assembly {
sender := shr(96, calldataload(sub(calldatasize(), 20)))
}
} else {
return super._msgSender();
}
}
function _msgData() internal view virtual override returns (bytes calldata) {
if (isTrustedForwarder(msg.sender)) {
return msg.data[:msg.data.length - 20];
} else {
return super._msgData();
}
}
}
// File: contracts/interfaces/IERC2771.sol
pragma solidity ^0.8.10;
interface IERC2771 {
function isTrustedForwarder(address forwarder) external;
}
// File: contracts/libs/StakeInfo.sol
pragma solidity ^0.8.10;
// mapping: NFT tokenId => StakeInfo (used in tokenURI generation + other contracts)
// StakeInfo encoded as:
// term (uint16)
// | maturityTs (uint64)
// | amount (uint128) TODO: storing here vs. separately as full uint256 ???
// | apy (uint16)
// | rarityScore (uint16)
// | rarityBits (uint16):
// [15] tokenIdIsPrime
// [14] tokenIdIsFib
// [14] blockIdIsPrime
// [13] blockIdIsFib
// [0-13] ...
library StakeInfo {
/**
@dev helper to convert Bool to U256 type and make compiler happy
*/
// TODO: remove if not needed ???
function toU256(bool x) internal pure returns (uint256 r) {
assembly {
r := x
}
}
/**
@dev encodes StakeInfo record from its props
*/
function encodeStakeInfo(
uint256 term,
uint256 maturityTs,
uint256 amount,
uint256 apy,
uint256 rarityScore,
uint256 rarityBits
) public pure returns (uint256 info) {
info = info | (rarityBits & 0xFFFF);
info = info | ((rarityScore & 0xFFFF) << 16);
info = info | ((apy & 0xFFFF) << 32);
info = info | ((amount & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF) << 48);
info = info | ((maturityTs & 0xFFFFFFFFFFFFFFFF) << 176);
info = info | ((term & 0xFFFF) << 240);
}
/**
@dev decodes StakeInfo record and extracts all of its props
*/
function decodeStakeInfo(
uint256 info
)
public
pure
returns (uint256 term, uint256 maturityTs, uint256 amount, uint256 apy, uint256 rarityScore, uint256 rarityBits)
{
term = uint16(info >> 240);
maturityTs = uint64(info >> 176);
amount = uint128(info >> 48);
apy = uint16(info >> 32);
rarityScore = uint16(info >> 16);
rarityBits = uint16(info);
}
/**
@dev extracts `term` prop from encoded StakeInfo
*/
function getTerm(uint256 info) public pure returns (uint256 term) {
(term, , , , , ) = decodeStakeInfo(info);
}
/**
@dev extracts `maturityTs` prop from encoded StakeInfo
*/
function getMaturityTs(uint256 info) public pure returns (uint256 maturityTs) {
(, maturityTs, , , , ) = decodeStakeInfo(info);
}
/**
@dev extracts `amount` prop from encoded StakeInfo
*/
function getAmount(uint256 info) public pure returns (uint256 amount) {
(, , amount, , , ) = decodeStakeInfo(info);
}
/**
@dev extracts `APY` prop from encoded StakeInfo
*/
function getAPY(uint256 info) public pure returns (uint256 apy) {
(, , , apy, , ) = decodeStakeInfo(info);
}
/**
@dev extracts `rarityScore` prop from encoded StakeInfo
*/
function getRarityScore(uint256 info) public pure returns (uint256 rarityScore) {
(, , , , rarityScore, ) = decodeStakeInfo(info);
}
/**
@dev extracts `rarityBits` prop from encoded StakeInfo
*/
function getRarityBits(uint256 info) public pure returns (uint256 rarityBits) {
(, , , , , rarityBits) = decodeStakeInfo(info);
}
/**
@dev decodes boolean flags from `rarityBits` prop
*/
function decodeRarityBits(
uint256 rarityBits
) public pure returns (bool isPrime, bool isFib, bool blockIsPrime, bool blockIsFib) {
isPrime = rarityBits & 0x0008 > 0;
isFib = rarityBits & 0x0004 > 0;
blockIsPrime = rarityBits & 0x0002 > 0;
blockIsFib = rarityBits & 0x0001 > 0;
}
/**
@dev encodes boolean flags to `rarityBits` prop
*/
function encodeRarityBits(
bool isPrime,
bool isFib,
bool blockIsPrime,
bool blockIsFib
) public pure returns (uint256 rarityBits) {
rarityBits = rarityBits | ((toU256(isPrime) << 3) & 0xFFFF);
rarityBits = rarityBits | ((toU256(isFib) << 2) & 0xFFFF);
rarityBits = rarityBits | ((toU256(blockIsPrime) << 1) & 0xFFFF);
rarityBits = rarityBits | ((toU256(blockIsFib)) & 0xFFFF);
}
/**
@dev extracts `rarityBits` prop from encoded StakeInfo
*/
function getRarityBitsDecoded(
uint256 info
) public pure returns (bool isPrime, bool isFib, bool blockIsPrime, bool blockIsFib) {
(, , , , , uint256 rarityBits) = decodeStakeInfo(info);
(isPrime, isFib, blockIsPrime, blockIsFib) = decodeRarityBits(rarityBits);
}
}
// File: contracts/libs/BokkyPooBahsDateTimeLibrary.sol
pragma solidity ^0.8.10;
// ----------------------------------------------------------------------------
// BokkyPooBah's DateTime Library v1.01
//
// A gas-efficient Solidity date and time library
//
// https://github.com/bokkypoobah/BokkyPooBahsDateTimeLibrary
//
// Tested date range 1970/01/01 to 2345/12/31
//
// Conventions:
// Unit | Range | Notes
// :-------- |:-------------:|:-----
// timestamp | >= 0 | Unix timestamp, number of seconds since 1970/01/01 00:00:00 UTC
// year | 1970 ... 2345 |
// month | 1 ... 12 |
// day | 1 ... 31 |
// hour | 0 ... 23 |
// minute | 0 ... 59 |
// second | 0 ... 59 |
// dayOfWeek | 1 ... 7 | 1 = Monday, ..., 7 = Sunday
//
//
// Enjoy. (c) BokkyPooBah / Bok Consulting Pty Ltd 2018-2019. The MIT Licence.
// ----------------------------------------------------------------------------
library BokkyPooBahsDateTimeLibrary {
uint256 constant _SECONDS_PER_DAY = 24 * 60 * 60;
uint256 constant _SECONDS_PER_HOUR = 60 * 60;
uint256 constant _SECONDS_PER_MINUTE = 60;
int256 constant _OFFSET19700101 = 2440588;
uint256 constant _DOW_FRI = 5;
uint256 constant _DOW_SAT = 6;
// ------------------------------------------------------------------------
// Calculate the number of days from 1970/01/01 to year/month/day using
// the date conversion algorithm from
// https://aa.usno.navy.mil/faq/JD_formula.html
// and subtracting the offset 2440588 so that 1970/01/01 is day 0
//
// days = day
// - 32075
// + 1461 * (year + 4800 + (month - 14) / 12) / 4
// + 367 * (month - 2 - (month - 14) / 12 * 12) / 12
// - 3 * ((year + 4900 + (month - 14) / 12) / 100) / 4
// - offset
// ------------------------------------------------------------------------
function _daysFromDate(uint256 year, uint256 month, uint256 day) private pure returns (uint256 _days) {
require(year >= 1970);
int256 _year = int256(year);
int256 _month = int256(month);
int256 _day = int256(day);
int256 __days = _day -
32075 +
(1461 * (_year + 4800 + (_month - 14) / 12)) /
4 +
(367 * (_month - 2 - ((_month - 14) / 12) * 12)) /
12 -
(3 * ((_year + 4900 + (_month - 14) / 12) / 100)) /
4 -
_OFFSET19700101;
_days = uint256(__days);
}
// ------------------------------------------------------------------------
// Calculate year/month/day from the number of days since 1970/01/01 using
// the date conversion algorithm from
// http://aa.usno.navy.mil/faq/docs/JD_Formula.php
// and adding the offset 2440588 so that 1970/01/01 is day 0
//
// int L = days + 68569 + offset
// int N = 4 * L / 146097
// L = L - (146097 * N + 3) / 4
// year = 4000 * (L + 1) / 1461001
// L = L - 1461 * year / 4 + 31
// month = 80 * L / 2447
// dd = L - 2447 * month / 80
// L = month / 11
// month = month + 2 - 12 * L
// year = 100 * (N - 49) + year + L
// ------------------------------------------------------------------------
function _daysToDate(uint256 _days) private pure returns (uint256 year, uint256 month, uint256 day) {
int256 __days = int256(_days);
int256 L = __days + 68569 + _OFFSET19700101;
int256 N = (4 * L) / 146097;
L = L - (146097 * N + 3) / 4;
int256 _year = (4000 * (L + 1)) / 1461001;
L = L - (1461 * _year) / 4 + 31;
int256 _month = (80 * L) / 2447;
int256 _day = L - (2447 * _month) / 80;
L = _month / 11;
_month = _month + 2 - 12 * L;
_year = 100 * (N - 49) + _year + L;
year = uint256(_year);
month = uint256(_month);
day = uint256(_day);
}
function timestampFromDate(uint256 year, uint256 month, uint256 day) internal pure returns (uint256 timestamp) {
timestamp = _daysFromDate(year, month, day) * _SECONDS_PER_DAY;
}
function timestampFromDateTime(
uint256 year,
uint256 month,
uint256 day,
uint256 hour,
uint256 minute,
uint256 second
) internal pure returns (uint256 timestamp) {
timestamp =
_daysFromDate(year, month, day) *
_SECONDS_PER_DAY +
hour *
_SECONDS_PER_HOUR +
minute *
_SECONDS_PER_MINUTE +
second;
}
function timestampToDate(uint256 timestamp) internal pure returns (uint256 year, uint256 month, uint256 day) {
(year, month, day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
}
function timestampToDateTime(
uint256 timestamp
) internal pure returns (uint256 year, uint256 month, uint256 day, uint256 hour, uint256 minute, uint256 second) {
(year, month, day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
uint256 secs = timestamp % _SECONDS_PER_DAY;
hour = secs / _SECONDS_PER_HOUR;
secs = secs % _SECONDS_PER_HOUR;
minute = secs / _SECONDS_PER_MINUTE;
second = secs % _SECONDS_PER_MINUTE;
}
function isValidDate(uint256 year, uint256 month, uint256 day) internal pure returns (bool valid) {
if (year >= 1970 && month > 0 && month <= 12) {
uint256 daysInMonth = _getDaysInMonth(year, month);
if (day > 0 && day <= daysInMonth) {
valid = true;
}
}
}
function isValidDateTime(
uint256 year,
uint256 month,
uint256 day,
uint256 hour,
uint256 minute,
uint256 second
) internal pure returns (bool valid) {
if (isValidDate(year, month, day)) {
if (hour < 24 && minute < 60 && second < 60) {
valid = true;
}
}
}
function isLeapYear(uint256 timestamp) internal pure returns (bool leapYear) {
(uint256 year, , ) = _daysToDate(timestamp / _SECONDS_PER_DAY);
leapYear = _isLeapYear(year);
}
function _isLeapYear(uint256 year) private pure returns (bool leapYear) {
leapYear = ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
}
function isWeekDay(uint256 timestamp) internal pure returns (bool weekDay) {
weekDay = getDayOfWeek(timestamp) <= _DOW_FRI;
}
function isWeekEnd(uint256 timestamp) internal pure returns (bool weekEnd) {
weekEnd = getDayOfWeek(timestamp) >= _DOW_SAT;
}
function getDaysInMonth(uint256 timestamp) internal pure returns (uint256 daysInMonth) {
(uint256 year, uint256 month, ) = _daysToDate(timestamp / _SECONDS_PER_DAY);
daysInMonth = _getDaysInMonth(year, month);
}
function _getDaysInMonth(uint256 year, uint256 month) private pure returns (uint256 daysInMonth) {
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
daysInMonth = 31;
} else if (month != 2) {
daysInMonth = 30;
} else {
daysInMonth = _isLeapYear(year) ? 29 : 28;
}
}
// 1 = Monday, 7 = Sunday
function getDayOfWeek(uint256 timestamp) internal pure returns (uint256 dayOfWeek) {
uint256 _days = timestamp / _SECONDS_PER_DAY;
dayOfWeek = ((_days + 3) % 7) + 1;
}
function getYear(uint256 timestamp) internal pure returns (uint256 year) {
(year, , ) = _daysToDate(timestamp / _SECONDS_PER_DAY);
}
function getMonth(uint256 timestamp) internal pure returns (uint256 month) {
(, month, ) = _daysToDate(timestamp / _SECONDS_PER_DAY);
}
function getDay(uint256 timestamp) internal pure returns (uint256 day) {
(, , day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
}
function getHour(uint256 timestamp) internal pure returns (uint256 hour) {
uint256 secs = timestamp % _SECONDS_PER_DAY;
hour = secs / _SECONDS_PER_HOUR;
}
function getMinute(uint256 timestamp) internal pure returns (uint256 minute) {
uint256 secs = timestamp % _SECONDS_PER_HOUR;
minute = secs / _SECONDS_PER_MINUTE;
}
function getSecond(uint256 timestamp) internal pure returns (uint256 second) {
second = timestamp % _SECONDS_PER_MINUTE;
}
function addYears(uint256 timestamp, uint256 _years) internal pure returns (uint256 newTimestamp) {
(uint256 year, uint256 month, uint256 day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
year += _years;
uint256 daysInMonth = _getDaysInMonth(year, month);
if (day > daysInMonth) {
day = daysInMonth;
}
newTimestamp = _daysFromDate(year, month, day) * _SECONDS_PER_DAY + (timestamp % _SECONDS_PER_DAY);
require(newTimestamp >= timestamp);
}
function addMonths(uint256 timestamp, uint256 _months) internal pure returns (uint256 newTimestamp) {
(uint256 year, uint256 month, uint256 day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
month += _months;
year += (month - 1) / 12;
month = ((month - 1) % 12) + 1;
uint256 daysInMonth = _getDaysInMonth(year, month);
if (day > daysInMonth) {
day = daysInMonth;
}
newTimestamp = _daysFromDate(year, month, day) * _SECONDS_PER_DAY + (timestamp % _SECONDS_PER_DAY);
require(newTimestamp >= timestamp);
}
function addDays(uint256 timestamp, uint256 _days) internal pure returns (uint256 newTimestamp) {
newTimestamp = timestamp + _days * _SECONDS_PER_DAY;
require(newTimestamp >= timestamp);
}
function addHours(uint256 timestamp, uint256 _hours) internal pure returns (uint256 newTimestamp) {
newTimestamp = timestamp + _hours * _SECONDS_PER_HOUR;
require(newTimestamp >= timestamp);
}
function addMinutes(uint256 timestamp, uint256 _minutes) internal pure returns (uint256 newTimestamp) {
newTimestamp = timestamp + _minutes * _SECONDS_PER_MINUTE;
require(newTimestamp >= timestamp);
}
function addSeconds(uint256 timestamp, uint256 _seconds) internal pure returns (uint256 newTimestamp) {
newTimestamp = timestamp + _seconds;
require(newTimestamp >= timestamp);
}
function subYears(uint256 timestamp, uint256 _years) internal pure returns (uint256 newTimestamp) {
(uint256 year, uint256 month, uint256 day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
year -= _years;
uint256 daysInMonth = _getDaysInMonth(year, month);
if (day > daysInMonth) {
day = daysInMonth;
}
newTimestamp = _daysFromDate(year, month, day) * _SECONDS_PER_DAY + (timestamp % _SECONDS_PER_DAY);
require(newTimestamp <= timestamp);
}
function subMonths(uint256 timestamp, uint256 _months) internal pure returns (uint256 newTimestamp) {
(uint256 year, uint256 month, uint256 day) = _daysToDate(timestamp / _SECONDS_PER_DAY);
uint256 yearMonth = year * 12 + (month - 1) - _months;
year = yearMonth / 12;
month = (yearMonth % 12) + 1;
uint256 daysInMonth = _getDaysInMonth(year, month);
if (day > daysInMonth) {
day = daysInMonth;
}
newTimestamp = _daysFromDate(year, month, day) * _SECONDS_PER_DAY + (timestamp % _SECONDS_PER_DAY);
require(newTimestamp <= timestamp);
}
function subDays(uint256 timestamp, uint256 _days) internal pure returns (uint256 newTimestamp) {
newTimestamp = timestamp - _days * _SECONDS_PER_DAY;
require(newTimestamp <= timestamp);
}
function subHours(uint256 timestamp, uint256 _hours) internal pure returns (uint256 newTimestamp) {
newTimestamp = timestamp - _hours * _SECONDS_PER_HOUR;
require(newTimestamp <= timestamp);
}
function subMinutes(uint256 timestamp, uint256 _minutes) internal pure returns (uint256 newTimestamp) {
newTimestamp = timestamp - _minutes * _SECONDS_PER_MINUTE;
require(newTimestamp <= timestamp);
}
function subSeconds(uint256 timestamp, uint256 _seconds) internal pure returns (uint256 newTimestamp) {
newTimestamp = timestamp - _seconds;
require(newTimestamp <= timestamp);
}
function diffYears(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _years) {
require(fromTimestamp <= toTimestamp);
(uint256 fromYear, , ) = _daysToDate(fromTimestamp / _SECONDS_PER_DAY);
(uint256 toYear, , ) = _daysToDate(toTimestamp / _SECONDS_PER_DAY);
_years = toYear - fromYear;
}
function diffMonths(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _months) {
require(fromTimestamp <= toTimestamp);
(uint256 fromYear, uint256 fromMonth, ) = _daysToDate(fromTimestamp / _SECONDS_PER_DAY);
(uint256 toYear, uint256 toMonth, ) = _daysToDate(toTimestamp / _SECONDS_PER_DAY);
_months = toYear * 12 + toMonth - fromYear * 12 - fromMonth;
}
function diffDays(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _days) {
require(fromTimestamp <= toTimestamp);
_days = (toTimestamp - fromTimestamp) / _SECONDS_PER_DAY;
}
function diffHours(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _hours) {
require(fromTimestamp <= toTimestamp);
_hours = (toTimestamp - fromTimestamp) / _SECONDS_PER_HOUR;
}
function diffMinutes(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _minutes) {
require(fromTimestamp <= toTimestamp);
_minutes = (toTimestamp - fromTimestamp) / _SECONDS_PER_MINUTE;
}
function diffSeconds(uint256 fromTimestamp, uint256 toTimestamp) internal pure returns (uint256 _seconds) {
require(fromTimestamp <= toTimestamp);
_seconds = toTimestamp - fromTimestamp;
}
}
// File: contracts/libs/DateTime.sol
pragma solidity ^0.8.10;
/*
@dev Library to convert epoch timestamp to a human-readable Date-Time string
@dependency uses BokkyPooBahsDateTimeLibrary.sol library internally
*/
library DateTime {
using Strings for uint256;
bytes public constant MONTHS = bytes("JanFebMarAprMayJunJulAugSepOctNovDec");
/**
* @dev returns month as short (3-letter) string
*/
function monthAsString(uint256 idx) internal pure returns (string memory) {
require(idx > 0, "bad idx");
bytes memory str = new bytes(3);
uint256 offset = (idx - 1) * 3;
str[0] = bytes1(MONTHS[offset]);
str[1] = bytes1(MONTHS[offset + 1]);
str[2] = bytes1(MONTHS[offset + 2]);
return string(str);
}
/**
* @dev returns string representation of number left-padded for 2 symbols
*/
function asPaddedString(uint256 n) internal pure returns (string memory) {
if (n == 0) return "00";
if (n < 10) return string.concat("0", n.toString());
return n.toString();
}
/**
* @dev returns string of format 'Jan 01, 2022 18:00 UTC' for a given timestamp
*/
function asString(uint256 ts) external pure returns (string memory) {
(uint256 year, uint256 month, uint256 day, uint256 hour, uint256 minute, ) = BokkyPooBahsDateTimeLibrary
.timestampToDateTime(ts);
return
string(
abi.encodePacked(
monthAsString(month),
" ",
day.toString(),
", ",
year.toString(),
" ",
asPaddedString(hour),
":",
asPaddedString(minute),
" UTC"
)
);
}
/**
* @dev returns (year, month as string) components of a date by timestamp
*/
function yearAndMonth(uint256 ts) external pure returns (uint256, string memory) {
(uint256 year, uint256 month, , , , ) = BokkyPooBahsDateTimeLibrary.timestampToDateTime(ts);
return (year, monthAsString(month));
}
}
// File: contracts/libs/FormattedStrings.sol
pragma solidity ^0.8.10;
library FormattedStrings {
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
Base on OpenZeppelin `toString` method from `String` library
*/
function toFormattedString(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;
}
uint256 pos;
uint256 comas = digits / 3;
digits = digits + (digits % 3 == 0 ? comas - 1 : comas);
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
if (pos == 3) {
buffer[digits] = ",";
pos = 0;
} else {
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
pos++;
}
}
return string(buffer);
}
}
// File: contracts/libs/StakeSVG.sol
pragma solidity ^0.8.10;
/*
@dev Library to create SVG image for XENFT metadata
@dependency depends on DataTime.sol and StringData.sol libraries
*/
library StakeSVG {
// Type to encode all data params for SVG image generation
struct SvgParams {
string symbol;
address xenAddress;
uint256 tokenId;
uint256 term;
uint256 maturityTs;
uint256 amount;
uint256 apy;
uint256 rarityScore;
uint256 rarityBits;
}
// Type to encode SVG gradient stop color on HSL color scale
struct Color {
uint256 h;
uint256 s;
uint256 l;
uint256 a;
uint256 off;
}
// Type to encode SVG gradient
struct Gradient {
Color[] colors;
uint256 id;
uint256[4] coords;
}
using DateTime for uint256;
using Strings for uint256;
using FormattedStrings for uint256;
using Strings for address;
string private constant _STYLE =
"<style> "
".base {fill: #ededed;font-family:Montserrat,arial,sans-serif;font-size:30px;font-weight:400;} "
".series {text-transform: uppercase} "
".logo {font-size:200px;font-weight:100;} "
".meta {font-size:12px;} "
".small {font-size:8px;} "
".burn {font-weight:500;font-size:16px;} }"
"</style>";
string private constant _STAKE =
"<g>"
"<path "
'stroke="#ededed" '
'fill="none" '
'transform="translate(250,379), scale(0.7)" '
'd="m 0 5 a 5 5 0 0 1 5 -5 l 40 0 a 5 5 0 0 1 5 5 l 0 40 a 5 5 0 0 1 -5 5 l -40 0 a 5 5 0 0 1 -5 -5 l 0 -40z m 25 0 l 20 10 l -20 10 l -20 -10 l 20 -10 m 10 15 l 10 5 l -20 10 l -20 -10 l 10 -5 m 20 10 l 10 5 l -20 10 l -20 -10 l 10 -5"/>'
"</g>";
string private constant _LOGO =
'<path fill="#ededed" '
'd="M122.7,227.1 l-4.8,0l55.8,-74l0,3.2l-51.8,-69.2l5,0l48.8,65.4l-1.2,0l48.8,-65.4l4.8,0l-51.2,68.4l0,-1.6l55.2,73.2l-5,0l-52.8,-70.2l1.2,0l-52.8,70.2z" '
'vector-effect="non-scaling-stroke" />';
/**
@dev internal helper to create HSL-encoded color prop for SVG tags
*/
function colorHSL(Color memory c) internal pure returns (bytes memory) {
return abi.encodePacked("hsl(", c.h.toString(), ", ", c.s.toString(), "%, ", c.l.toString(), "%)");
}
/**
@dev internal helper to create `stop` SVG tag
*/
function colorStop(Color memory c) internal pure returns (bytes memory) {
return
abi.encodePacked(
'<stop stop-color="',
colorHSL(c),
'" stop-opacity="',
c.a.toString(),
'" offset="',
c.off.toString(),
'%"/>'
);
}
/**
@dev internal helper to encode position for `Gradient` SVG tag
*/
function pos(uint256[4] memory coords) internal pure returns (bytes memory) {
return
abi.encodePacked(
'x1="',
coords[0].toString(),
'%" '
'y1="',
coords[1].toString(),
'%" '
'x2="',
coords[2].toString(),
'%" '
'y2="',
coords[3].toString(),
'%" '
);
}
/**
@dev internal helper to create `Gradient` SVG tag
*/
function linearGradient(
Color[] memory colors,
uint256 id,
uint256[4] memory coords
) internal pure returns (bytes memory) {
string memory stops = "";
for (uint256 i = 0; i < colors.length; i++) {
if (colors[i].h != 0) {
stops = string.concat(stops, string(colorStop(colors[i])));
}
}
return
abi.encodePacked(
"<linearGradient ",
pos(coords),
'id="g',
id.toString(),
'">',
stops,
"</linearGradient>"
);
}
/**
@dev internal helper to create `Defs` SVG tag
*/
function defs(Gradient memory grad) internal pure returns (bytes memory) {
return abi.encodePacked("<defs>", linearGradient(grad.colors, 0, grad.coords), "</defs>");
}
/**
@dev internal helper to create `Rect` SVG tag
*/
function rect(uint256 id) internal pure returns (bytes memory) {
return
abi.encodePacked(
"<rect "
'width="100%" '
'height="100%" '
'fill="url(#g',
id.toString(),
')" '
'rx="10px" '
'ry="10px" '
'stroke-linejoin="round" '
"/>"
);
}
/**
@dev internal helper to create border `Rect` SVG tag
*/
function border() internal pure returns (string memory) {
return
"<rect "
'width="94%" '
'height="96%" '
'fill="transparent" '
'rx="10px" '
'ry="10px" '
'stroke-linejoin="round" '
'x="3%" '
'y="2%" '
'stroke-dasharray="1,6" '
'stroke="white" '
"/>";
}
/**
@dev internal helper to create group `G` SVG tag
*/
function g(uint256 gradientsCount) internal pure returns (bytes memory) {
string memory background = "";
for (uint256 i = 0; i < gradientsCount; i++) {
background = string.concat(background, string(rect(i)));
}
return abi.encodePacked("<g>", background, border(), "</g>");
}
/**
@dev internal helper to create XEN logo line pattern with 2 SVG `lines`
*/
function logo() internal pure returns (bytes memory) {
return abi.encodePacked();
}
/**
@dev internal helper to create `Text` SVG tag with XEN Crypto contract data
*/
function contractData(string memory symbol, address xenAddress) internal pure returns (bytes memory) {
return
abi.encodePacked(
"<text "
'x="50%" '
'y="5%" '
'class="base small" '
'dominant-baseline="middle" '
'text-anchor="middle">',
symbol,
unicode"・",
xenAddress.toHexString(),
"</text>"
);
}
/**
@dev internal helper to create 1st part of metadata section of SVG
*/
function meta1(
uint256 tokenId,
uint256 amount,
uint256 apy,
uint256 rarityScore
) internal pure returns (bytes memory) {
bytes memory part1 = abi.encodePacked(
"<text "
'x="50%" '
'y="50%" '
'class="base " '
'dominant-baseline="middle" '
'text-anchor="middle">'
"XEN CRYPTO"
"</text>"
"<text "
'x="50%" '
'y="56%" '
'class="base burn" '
'text-anchor="middle" '
'dominant-baseline="middle"> ',
amount > 0 ? string.concat(amount.toFormattedString(), " X") : "",
"</text>"
"<text "
'x="18%" '
'y="62%" '
'class="base meta" '
'dominant-baseline="middle"> '
"#",
tokenId.toString(),
"</text>"
"<text "
'x="82%" '
'y="62%" '
'class="base meta series" '
'dominant-baseline="middle" '
'text-anchor="end" >STAKE</text>'
);
bytes memory part2 = abi.encodePacked(
"<text "
'x="18%" '
'y="68%" '
'class="base meta" '
'dominant-baseline="middle" >'
"APY: ",
apy.toString(),
"%"
"</text>"
"<text "
'x="18%" '
'y="72%" '
'class="base meta" '
'dominant-baseline="middle" >'
"Rarity: ",
rarityScore.toString(),
"</text>"
);
return abi.encodePacked(part1, part2);
}
/**
@dev internal helper to create 2nd part of metadata section of SVG
*/
function meta2(uint256 term, uint256 maturityTs) internal pure returns (bytes memory) {
bytes memory part3 = abi.encodePacked(
"<text "
'x="18%" '
'y="76%" '
'class="base meta" '
'dominant-baseline="middle" >'
"Term: ",
term.toString(),
" days"
"</text>"
"<text "
'x="18%" '
'y="80%" '
'class="base meta" '
'dominant-baseline="middle" >'
"Maturity: ",
maturityTs.asString(),
"</text>"
);
return abi.encodePacked(part3);
}
/**
@dev main internal helper to create SVG file representing XENFT
*/
function image(SvgParams memory params, Gradient[] memory gradients) internal pure returns (bytes memory) {
string memory mark = _STAKE;
bytes memory graphics = abi.encodePacked(defs(gradients[0]), _STYLE, g(gradients.length), _LOGO, mark);
bytes memory metadata = abi.encodePacked(
contractData(params.symbol, params.xenAddress),
meta1(params.tokenId, params.amount, params.apy, params.rarityScore),
meta2(params.term, params.maturityTs)
);
return
abi.encodePacked(
"<svg "
'xmlns="http://www.w3.org/2000/svg" '
'preserveAspectRatio="xMinYMin meet" '
'viewBox="0 0 350 566">',
graphics,
metadata,
"</svg>"
);
}
}
// File: contracts/libs/StakeMetadata.sol
pragma solidity ^0.8.10;
/**
@dev Library contains methods to generate on-chain NFT metadata
*/
library StakeMetadata {
using DateTime for uint256;
using StakeInfo for uint256;
using Strings for uint256;
// PRIVATE HELPERS
// The following pure methods returning arrays are workaround to use array constants,
// not yet available in Solidity
/**
@dev private helper to generate SVG gradients
*/
function _commonCategoryGradients() private pure returns (StakeSVG.Gradient[] memory gradients) {
StakeSVG.Color[] memory colors = new StakeSVG.Color[](3);
colors[0] = StakeSVG.Color({h: 50, s: 10, l: 36, a: 1, off: 0});
colors[1] = StakeSVG.Color({h: 50, s: 10, l: 12, a: 1, off: 50});
colors[2] = StakeSVG.Color({h: 50, s: 10, l: 5, a: 1, off: 100});
gradients = new StakeSVG.Gradient[](1);
gradients[0] = StakeSVG.Gradient({colors: colors, id: 0, coords: [uint256(50), 0, 50, 100]});
}
// PUBLIC INTERFACE
/**
@dev public interface to generate SVG image based on XENFT params
*/
function svgData(uint256 tokenId, uint256 info, address token) external view returns (bytes memory) {
string memory symbol = IERC20Metadata(token).symbol();
StakeSVG.SvgParams memory params = StakeSVG.SvgParams({
symbol: symbol,
xenAddress: token,
tokenId: tokenId,
term: info.getTerm(),
maturityTs: info.getMaturityTs(),
amount: info.getAmount(),
apy: info.getAPY(),
rarityScore: info.getRarityScore(),
rarityBits: info.getRarityBits()
});
return StakeSVG.image(params, _commonCategoryGradients());
}
function _attr1(uint256 amount, uint256 apy) private pure returns (bytes memory) {
return
abi.encodePacked(
'{"trait_type":"Amount","value":"',
amount.toString(),
'"},'
'{"trait_type":"APY","value":"',
apy.toString(),
'%"},'
);
}
function _attr2(uint256 term, uint256 maturityTs) private pure returns (bytes memory) {
(uint256 year, string memory month) = DateTime.yearAndMonth(maturityTs);
return
abi.encodePacked(
'{"trait_type":"Maturity DateTime","value":"',
maturityTs.asString(),
'"},'
'{"trait_type":"Term","value":"',
term.toString(),
'"},'
'{"trait_type":"Maturity Year","value":"',
year.toString(),
'"},'
'{"trait_type":"Maturity Month","value":"',
month,
'"},'
);
}
function _attr3(uint256 rarityScore, uint256) private pure returns (bytes memory) {
return abi.encodePacked('{"trait_type":"Rarity","value":"', rarityScore.toString(), '"}');
}
/**
@dev private helper to construct attributes portion of NFT metadata
*/
function attributes(uint256 stakeInfo) external pure returns (bytes memory) {
(
uint256 term,
uint256 maturityTs,
uint256 amount,
uint256 apy,
uint256 rarityScore,
uint256 rarityBits
) = StakeInfo.decodeStakeInfo(stakeInfo);
return
abi.encodePacked("[", _attr1(amount, apy), _attr2(term, maturityTs), _attr3(rarityScore, rarityBits), "]");
}
function formattedString(uint256 n) public pure returns (string memory) {
return FormattedStrings.toFormattedString(n);
}
}
// File: contracts/libs/Array.sol
pragma solidity ^0.8.10;
library Array {
function idx(uint256[] memory arr, uint256 item) internal pure returns (uint256 i) {
for (i = 1; i <= arr.length; i++) {
if (arr[i - 1] == item) {
return i;
}
}
i = 0;
}
function addItem(uint256[] storage arr, uint256 item) internal {
if (idx(arr, item) == 0) {
arr.push(item);
}
}
function removeItem(uint256[] storage arr, uint256 item) internal {
uint256 i = idx(arr, item);
if (i > 0) {
arr[i - 1] = arr[arr.length - 1];
arr.pop();
}
}
function contains(uint256[] memory container, uint256[] memory items) internal pure returns (bool) {
if (items.length == 0) return true;
for (uint256 i = 0; i < items.length; i++) {
bool itemIsContained = false;
for (uint256 j = 0; j < container.length; j++) {
itemIsContained = items[i] == container[j];
}
if (!itemIsContained) return false;
}
return true;
}
function asSingletonArray(uint256 element) internal pure returns (uint256[] memory) {
uint256[] memory array = new uint256[](1);
array[0] = element;
return array;
}
function hasDuplicatesOrZeros(uint256[] memory array) internal pure returns (bool) {
for (uint256 i = 0; i < array.length; i++) {
if (array[i] == 0) return true;
for (uint256 j = 0; j < array.length; j++) {
if (array[i] == array[j] && i != j) return true;
}
}
return false;
}
function hasRoguesOrZeros(uint256[] memory array) internal pure returns (bool) {
uint256 _first = array[0];
for (uint256 i = 0; i < array.length; i++) {
if (array[i] == 0 || array[i] != _first) return true;
}
return false;
}
}
// File: contracts/interfaces/IXENStake.sol
pragma solidity ^0.8.10;
interface IXENStake {
event CreateStake(address indexed user, uint256 indexed tokenId, uint256 amount, uint256 term);
event EndStake(address indexed user, uint256 indexed tokenId);
function createStake(uint256 amount, uint256 term) external returns (uint256);
function endStake(uint256 tokenId) external;
}
// File: contracts/interfaces/IXENStakeProxying.sol
pragma solidity ^0.8.10;
interface IXENStakeProxying {
function callStake(uint256 amount, uint256 term) external;
function callTransfer(address to) external;
function callWithdraw() external;
function powerDown() external;
}
// File: contracts/XENStake.sol
pragma solidity ^0.8.10;
/*
\\ // ||||||||||| |\ || A CRYPTOCURRENCY FOR THE MASSES
\\ // || |\\ ||
\\ // || ||\\ || PRINCIPLES OF XEN:
\\// || || \\ || - No pre-mint; starts with zero supply
XX |||||||| || \\ || - No admin keys
//\\ || || \\ || - Immutable contract
// \\ || || \\||
// \\ || || \\|
// \\ ||||||||||| || \| Copyright (C) FairCrypto Foundation 2022-23
XENFT XEN Stake props:
- amount, term, maturityTs, APY, rarityScore
*/
contract XENStake is
DefaultOperatorFilterer, // required to support OpenSea royalties
IXENStake,
IXENStakeProxying,
IBurnableToken,
ERC2771Context, // required to support meta transactions
IERC2981, // required to support NFT royalties
ERC721("XEN Stake", "fmXENS")
{
using Strings for uint256;
using StakeInfo for uint256;
using MagicNumbers for uint256;
using Array for uint256[];
// PUBLIC CONSTANTS
// XENFT common business logic
uint256 public constant SECONDS_IN_DAY = 24 * 3_600;
uint256 public constant BLACKOUT_TERM = 7 * SECONDS_IN_DAY;
string public constant AUTHORS = "@MrJackLevin @lbelyaev faircrypto.org";
uint256 public constant ROYALTY_BP = 500;
// PUBLIC MUTABLE STATE
// increasing counter for NFT tokenIds, also used as salt for proxies' spinning
uint256 public tokenIdCounter = 1;
// tokenId => stakeInfo
mapping(uint256 => uint256) public stakeInfo;
// PUBLIC IMMUTABLE STATE
// pointer to XEN Crypto contract
XENCrypto public immutable xenCrypto;
// PRIVATE STATE
// original contract marking to distinguish from proxy copies
address private immutable _original;
// original deployer address to be used for setting trusted forwarder
address private immutable _deployer;
// address to be used for royalties' tracking
address private immutable _royaltyReceiver;
// mapping Address => tokenId[]
mapping(address => uint256[]) private _ownedTokens;
constructor(address xenCrypto_, address forwarder_, address royaltyReceiver_) ERC2771Context(forwarder_) {
require(xenCrypto_ != address(0), "bad address");
_original = address(this);
_deployer = msg.sender;
_royaltyReceiver = royaltyReceiver_ == address(0) ? msg.sender : royaltyReceiver_;
xenCrypto = XENCrypto(xenCrypto_);
}
// INTERFACES & STANDARDS
// IERC165 IMPLEMENTATION
/**
@dev confirms support for IERC-165, IERC-721, IERC2981, IERC2771 and IBurnRedeemable interfaces
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
return
interfaceId == type(IBurnRedeemable).interfaceId ||
interfaceId == type(IERC2981).interfaceId ||
interfaceId == type(IERC2771).interfaceId ||
super.supportsInterface(interfaceId);
}
// ERC2771 IMPLEMENTATION
/**
@dev use ERC2771Context implementation of _msgSender()
*/
function _msgSender() internal view virtual override(Context, ERC2771Context) returns (address) {
return ERC2771Context._msgSender();
}
/**
@dev use ERC2771Context implementation of _msgData()
*/
function _msgData() internal view virtual override(Context, ERC2771Context) returns (bytes calldata) {
return ERC2771Context._msgData();
}
// OWNABLE IMPLEMENTATION
/**
@dev public getter to check for deployer / owner (Opensea, etc.)
*/
function owner() external view returns (address) {
return _deployer;
}
// ERC-721 METADATA IMPLEMENTATION
/**
@dev compliance with ERC-721 standard (NFT); returns NFT metadata, including SVG-encoded image
*/
function tokenURI(uint256 tokenId) public view override returns (string memory) {
uint256 info = stakeInfo[tokenId];
bytes memory dataURI = abi.encodePacked(
"{",
'"name": "XEN Stake #',
tokenId.toString(),
'",',
'"description": "XENFT: XEN Crypto Proof Of Stake",',
'"image": "',
"data:image/svg+xml;base64,",
Base64.encode(StakeMetadata.svgData(tokenId, info, address(xenCrypto))),
'",',
'"attributes": ',
StakeMetadata.attributes(info),
"}"
);
return string(abi.encodePacked("data:application/json;base64,", Base64.encode(dataURI)));
}
// IMPLEMENTATION OF XENStakeProxying INTERFACE
// FUNCTIONS IN PROXY COPY CONTRACTS (VMU), CALLING ORIGINAL XEN CRYPTO CONTRACT
/**
@dev function callable only in proxy contracts from the original one => XENCrypto.stake(amount, term)
*/
function callStake(uint256 amount, uint256 term) external {
require(msg.sender == _original, "XEN Proxy: unauthorized");
bytes memory callData = abi.encodeWithSignature("stake(uint256,uint256)", amount, term);
(bool success, ) = address(xenCrypto).call(callData);
require(success, "stake call failed");
}
/**
@dev function callable only in proxy contracts from the original one => XENCrypto.withdraw()
*/
function callWithdraw() external {
require(msg.sender == _original, "XEN Proxy: unauthorized");
bytes memory callData = abi.encodeWithSignature("withdraw()");
(bool success, ) = address(xenCrypto).call(callData);
require(success, "withdraw call failed");
}
/**
@dev function callable only in proxy contracts from the original one => XENCrypto.transfer(to, amount)
*/
function callTransfer(address to) external {
require(msg.sender == _original, "XEN Proxy: unauthorized");
uint256 balance = xenCrypto.balanceOf(address(this));
bytes memory callData = abi.encodeWithSignature("transfer(address,uint256)", to, balance);
(bool success, ) = address(xenCrypto).call(callData);
require(success, "transfer call failed");
}
/**
@dev function callable only in proxy contracts from the original one => destroys the proxy contract
*/
function powerDown() external {
require(msg.sender == _original, "XEN Proxy: unauthorized");
selfdestruct(payable(address(0)));
}
// OVERRIDING OF ERC-721 IMPLEMENTATION
// ENFORCEMENT OF TRANSFER BLACKOUT PERIOD
/**
@dev overrides OZ ERC-721 before transfer hook to check if there's no blackout period
*/
function _beforeTokenTransfer(address from, address, uint256 tokenId) internal virtual override {
if (from != address(0)) {
uint256 maturityTs = StakeInfo.getMaturityTs(stakeInfo[tokenId]);
uint256 delta = maturityTs > block.timestamp ? maturityTs - block.timestamp : block.timestamp - maturityTs;
require(delta > BLACKOUT_TERM, "XENFT: transfer prohibited in blackout period");
}
}
/**
@dev overrides OZ ERC-721 after transfer hook to allow token enumeration for owner
*/
function _afterTokenTransfer(address from, address to, uint256 tokenId) internal virtual override {
_ownedTokens[from].removeItem(tokenId);
_ownedTokens[to].addItem(tokenId);
}
// IBurnableToken IMPLEMENTATION
/**
@dev burns XENTorrent XENFT which can be used by connected contracts services
*/
function burn(address user, uint256 tokenId) public {
require(
IERC165(_msgSender()).supportsInterface(type(IBurnRedeemable).interfaceId),
"XENFT burn: not a supported contract"
);
require(user != address(0), "XENFT burn: illegal owner address");
require(tokenId > 0, "XENFT burn: illegal tokenId");
require(_isApprovedOrOwner(_msgSender(), tokenId), "XENFT burn: not an approved operator");
require(ownerOf(tokenId) == user, "XENFT burn: user is not tokenId owner");
_ownedTokens[user].removeItem(tokenId);
_burn(tokenId);
IBurnRedeemable(_msgSender()).onTokenBurned(user, tokenId);
}
// OVERRIDING ERC-721 IMPLEMENTATION TO ALLOW OPENSEA ROYALTIES ENFORCEMENT PROTOCOL
/**
@dev implements `setApprovalForAll` with additional approved Operator checking
*/
function setApprovalForAll(address operator, bool approved) public override onlyAllowedOperatorApproval(operator) {
super.setApprovalForAll(operator, approved);
}
/**
@dev implements `approve` with additional approved Operator checking
*/
function approve(address operator, uint256 tokenId) public override onlyAllowedOperatorApproval(operator) {
super.approve(operator, tokenId);
}
/**
@dev implements `transferFrom` with additional approved Operator checking
*/
function transferFrom(address from, address to, uint256 tokenId) public override onlyAllowedOperator(from) {
super.transferFrom(from, to, tokenId);
}
/**
@dev implements `safeTransferFrom` with additional approved Operator checking
*/
function safeTransferFrom(address from, address to, uint256 tokenId) public override onlyAllowedOperator(from) {
super.safeTransferFrom(from, to, tokenId);
}
/**
@dev implements `safeTransferFrom` with additional approved Operator checking
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory data
) public override onlyAllowedOperator(from) {
super.safeTransferFrom(from, to, tokenId, data);
}
// SUPPORT FOR ERC2771 META-TRANSACTIONS
/**
@dev Implements setting a `Trusted Forwarder` for meta-txs. Settable only once
*/
function addForwarder(address trustedForwarder) external {
require(msg.sender == _deployer, "XENFT: not an deployer");
require(_trustedForwarder == address(0), "XENFT: Forwarder is already set");
_trustedForwarder = trustedForwarder;
}
// SUPPORT FOR ERC2981 ROYALTY INFO
/**
@dev Implements getting Royalty Info by supported operators. ROYALTY_BP is expressed in basis points
*/
function royaltyInfo(uint256, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount) {
receiver = _royaltyReceiver;
royaltyAmount = (salePrice * ROYALTY_BP) / 10_000;
}
// XEN TORRENT PRIVATE / INTERNAL HELPERS
/**
@dev internal torrent interface. calculates rarityBits and rarityScore
*/
function _calcRarity(uint256 tokenId) private view returns (uint256 rarityScore, uint256 rarityBits) {
bool isPrime = tokenId.isPrime();
bool isFib = tokenId.isFib();
bool blockIsPrime = block.number.isPrime();
bool blockIsFib = block.number.isFib();
rarityScore += (isPrime ? 500 : 0);
rarityScore += (blockIsPrime ? 1_000 : 0);
rarityScore += (isFib ? 5_000 : 0);
rarityScore += (blockIsFib ? 10_000 : 0);
rarityBits = StakeInfo.encodeRarityBits(isPrime, isFib, blockIsPrime, blockIsFib);
}
/**
@dev internal torrent interface. composes StakeInfo
*/
function _stakeInfo(
address proxy,
uint256 tokenId,
uint256 amount,
uint256 term
) private view returns (uint256 info) {
(, uint256 maturityTs, , uint256 apy) = xenCrypto.userStakes(proxy);
(uint256 rarityScore, uint256 rarityBits) = _calcRarity(tokenId);
info = StakeInfo.encodeStakeInfo(term, maturityTs, amount / 10 ** 18, apy, rarityScore, rarityBits);
}
/**
@dev internal helper. Creates bytecode for minimal proxy contract
*/
function _bytecode() private view returns (bytes memory) {
return
bytes.concat(
bytes20(0x3D602d80600A3D3981F3363d3d373d3D3D363d73),
bytes20(address(this)),
bytes15(0x5af43d82803e903d91602b57fd5bf3)
);
}
/**
@dev internal torrent interface. initiates Stake Operation
*/
function _createStake(uint256 amount, uint256 term, uint256 tokenId) private {
bytes memory bytecode = _bytecode();
bytes memory callData = abi.encodeWithSignature("callStake(uint256,uint256)", amount, term);
address proxy;
bool succeeded;
bytes32 salt = keccak256(abi.encodePacked(tokenId));
assembly {
proxy := create2(0, add(bytecode, 0x20), mload(bytecode), salt)
}
require(proxy != address(0), "XENFT: Error creating VSU");
require(xenCrypto.transferFrom(_msgSender(), proxy, amount), "XENFT: Error transferring XEN to VSU");
assembly {
succeeded := call(gas(), proxy, 0, add(callData, 0x20), mload(callData), 0, 0)
}
require(succeeded, "XENFT: Error while staking");
stakeInfo[tokenId] = _stakeInfo(proxy, tokenId, amount, term);
}
/**
@dev internal torrent interface. initiates Stake Operation
*/
function _endStake(uint256 tokenId) private {
bytes memory bytecode = _bytecode();
bytes memory callData = abi.encodeWithSignature("callWithdraw()");
bytes memory callData1 = abi.encodeWithSignature("callTransfer(address)", _msgSender());
bytes memory callData2 = abi.encodeWithSignature("powerDown()");
bytes32 salt = keccak256(abi.encodePacked(tokenId));
bytes32 hash = keccak256(abi.encodePacked(hex"ff", address(this), salt, keccak256(bytecode)));
address proxy = address(uint160(uint256(hash)));
bool succeeded;
assembly {
succeeded := call(gas(), proxy, 0, add(callData, 0x20), mload(callData), 0, 0)
}
require(succeeded, "XENFT: Error while withdrawing");
assembly {
succeeded := call(gas(), proxy, 0, add(callData1, 0x20), mload(callData1), 0, 0)
}
require(succeeded, "XENFT: Error while transferring");
assembly {
succeeded := call(gas(), proxy, 0, add(callData2, 0x20), mload(callData2), 0, 0)
}
require(succeeded, "XENFT: Error while powering down");
delete stakeInfo[tokenId];
}
// PUBLIC GETTERS
/**
@dev public getter for tokens owned by address
*/
function ownedTokens() external view returns (uint256[] memory) {
return _ownedTokens[_msgSender()];
}
// PUBLIC TRANSACTIONAL INTERFACE
/**
@dev public XEN Stake interface
initiates XEN Crypto Stake
*/
function createStake(uint256 amount, uint256 term) public returns (uint256 tokenId) {
require(amount > 0, "XENFT: Illegal amount");
require(term > 0, "XENFT: Illegal term");
_createStake(amount, term, tokenIdCounter);
_ownedTokens[_msgSender()].addItem(tokenIdCounter);
_safeMint(_msgSender(), tokenIdCounter);
tokenId = tokenIdCounter;
tokenIdCounter++;
emit CreateStake(_msgSender(), tokenId, amount, term);
}
/**
@dev public XEN Stake interface
ends XEN Crypto Stake, withdraws principal and reward amounts
*/
function endStake(uint256 tokenId) public {
require(tokenId > 0, "XENFT: Illegal tokenId");
require(ownerOf(tokenId) == _msgSender(), "XENFT: Incorrect owner");
uint256 maturityTs = StakeInfo.getMaturityTs(stakeInfo[tokenId]);
require(block.timestamp > maturityTs, "XENFT: Maturity not reached");
_endStake(tokenId);
_ownedTokens[_msgSender()].removeItem(tokenId);
_burn(tokenId);
emit EndStake(_msgSender(), tokenId);
}
}[{"inputs":[{"internalType":"address","name":"xenCrypto_","type":"address"},{"internalType":"address","name":"forwarder_","type":"address"},{"internalType":"address","name":"royaltyReceiver_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"operator","type":"address"}],"name":"OperatorNotAllowed","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"term","type":"uint256"}],"name":"CreateStake","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"EndStake","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"AUTHORS","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"BLACKOUT_TERM","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"OPERATOR_FILTER_REGISTRY","outputs":[{"internalType":"contract IOperatorFilterRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ROYALTY_BP","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"SECONDS_IN_DAY","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"trustedForwarder","type":"address"}],"name":"addForwarder","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"term","type":"uint256"}],"name":"callStake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"callTransfer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"callWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"term","type":"uint256"}],"name":"createStake","outputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"endStake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"forwarder","type":"address"}],"name":"isTrustedForwarder","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ownedTokens","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"powerDown","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"salePrice","type":"uint256"}],"name":"royaltyInfo","outputs":[{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"royaltyAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"stakeInfo","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenIdCounter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"xenCrypto","outputs":[{"internalType":"contract XENCrypto","name":"","type":"address"}],"stateMutability":"view","type":"function"}]Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000044c5776735f6def0aeb2cc76a526f2128ef68aa50000000000000000000000000000000000000000000000000000000000000000000000000000000000000000c73fc08c931efe3fce850c09278472e8a81c2e05
-----Decoded View---------------
Arg [0] : xenCrypto_ (address): 0x44c5776735F6DEf0AEb2cC76a526f2128ef68Aa5
Arg [1] : forwarder_ (address): 0x0000000000000000000000000000000000000000
Arg [2] : royaltyReceiver_ (address): 0xC73Fc08C931Efe3FCE850C09278472e8a81c2e05
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000044c5776735f6def0aeb2cc76a526f2128ef68aa5
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [2] : 000000000000000000000000c73fc08c931efe3fce850c09278472e8a81c2e05
Library Used
MagicNumbers : 0xf7433d491e7fea60f8db1060c83908170b177e36UnverifiedStakeMetadata : 0xff55e442aaf94dd49712173cb097d6d86a140739UnverifiedStakeInfo : 0x4c9e86e83e81165784af15a5c72a4cf49ba35732Unverified
Deployed Bytecode Sourcemap
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Swarm Source
ipfs://46630899531eb29dd8a242c6f22ad6e291ba0ae57d66288693b0aec6f2f7b303
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.