Contract Name:
OnChainBabyOtter
Contract Source Code:
File 1 of 1 : OnChainBabyOtter
// SPDX-License-Identifier: MIT
pragma solidity >=0.7.0 <0.9.0;
// File: @chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol
pragma solidity ^0.8.0;
interface AggregatorV3Interface {
function decimals() external view returns (uint8);
function description() external view returns (string memory);
function version() external view returns (uint256);
// getRoundData and latestRoundData should both raise "No data present"
// if they do not have data to report, instead of returning unset values
// which could be misinterpreted as actual reported values.
function getRoundData(uint80 _roundId)
external
view
returns (
uint80 roundId,
int256 answer,
uint256 startedAt,
uint256 updatedAt,
uint80 answeredInRound
);
function latestRoundData()
external
view
returns (
uint80 roundId,
int256 answer,
uint256 startedAt,
uint256 updatedAt,
uint80 answeredInRound
);
}
// File: @openzeppelin/contracts/utils/Counters.sol
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)
pragma solidity ^0.8.0;
/**
* @title Counters
* @author Matt Condon (@shrugs)
* @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
* of elements in a mapping, issuing ERC721 ids, or counting request ids.
*
* Include with `using Counters for Counters.Counter;`
*/
library Counters {
struct Counter {
// This variable should never be directly accessed by users of the library: interactions must be restricted to
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
// this feature: see https://github.com/ethereum/solidity/issues/4637
uint256 _value; // default: 0
}
function current(Counter storage counter) internal view returns (uint256) {
return counter._value;
}
function increment(Counter storage counter) internal {
unchecked {
counter._value += 1;
}
}
function decrement(Counter storage counter) internal {
uint256 value = counter._value;
require(value > 0, "Counter: decrement overflow");
unchecked {
counter._value = value - 1;
}
}
function reset(Counter storage counter) internal {
counter._value = 0;
}
}
// File: @openzeppelin/contracts/utils/Base64.sol
// OpenZeppelin Contracts (last updated v4.5.0) (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));
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: @openzeppelin/contracts/utils/Strings.sol
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0x00";
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
}
// File: @openzeppelin/contracts/utils/Context.sol
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// File: @openzeppelin/contracts/access/Ownable.sol
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// File: @openzeppelin/contracts/utils/Address.sol
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol
// OpenZeppelin Contracts (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/utils/introspection/IERC165.sol
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// File: @openzeppelin/contracts/utils/introspection/ERC165.sol
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
// File: @openzeppelin/contracts/token/ERC721/IERC721.sol
// OpenZeppelin Contracts (last updated v4.6.0) (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 be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev 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/extensions/IERC721Metadata.sol
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.0;
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Metadata is IERC721 {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// File: @openzeppelin/contracts/token/ERC721/ERC721.sol
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/ERC721.sol)
pragma solidity ^0.8.0;
/**
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
* the Metadata extension, but not including the Enumerable extension, which is available separately as
* {ERC721Enumerable}.
*/
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
using Strings for uint256;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Mapping from token ID to owner address
mapping(uint256 => address) private _owners;
// Mapping owner address to token count
mapping(address => uint256) private _balances;
// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721-balanceOf}.
*/
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), "ERC721: balance query for the zero address");
return _balances[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
address owner = _owners[tokenId];
require(owner != address(0), "ERC721: owner query for nonexistent token");
return owner;
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
string memory baseURI = _baseURI();
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
}
/**
* @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
* token will be the concatenation of the `baseURI` and the `tokenId`. Empty
* by default, can be 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 owner nor approved for all"
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual override {
_setApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_safeTransfer(from, to, tokenId, _data);
}
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* `_data` is additional data, it has no specified format and it is sent in call to `to`.
*
* This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeTransfer(
address from,
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted (`_mint`),
* and stop existing when they are burned (`_burn`).
*/
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return _owners[tokenId] != address(0);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ERC721.ownerOf(tokenId);
return (spender == owner || 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 a {Approval} event.
*/
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
}
/**
* @dev Approve `operator` to operate on all of `owner` tokens
*
* Emits a {ApprovalForAll} event.
*/
function _setApprovalForAll(
address owner,
address operator,
bool approved
) internal virtual {
require(owner != operator, "ERC721: approve to caller");
_operatorApprovals[owner][operator] = approved;
emit ApprovalForAll(owner, operator, approved);
}
/**
* @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
* The call is not executed if the target address is not a contract.
*
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
if (to.isContract()) {
try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721Receiver.onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert("ERC721: transfer to non ERC721Receiver implementer");
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
}
// File: contracts/OnChainBabyOtter.sol
pragma solidity >=0.7.0 <0.9.0;
/**
* 100% ethereum on-chain baby otter, by Prof. Otterlove.
*
*
* I did an experiment to create the cutest animal on the blockchain,
* and the cutest animal is otter, it's obvious.
* I don't want people to fight over my cute babies otters,
* that's why there isn't one more rare than another.
* By the way, I've noticed that babies otters
* can take differents characters on adoption.
*
* Be good parents, they are not toys, they have a heart...
* But, they are so cute, so I have no doubts.
*
*/
contract OnChainBabyOtter is ERC721, Ownable {
using Counters for Counters.Counter;
Counters.Counter private _babyOtterIds;
using Strings for uint256;
bool pauseAdoption = true;
bool revealed;
mapping(address => bool) internal _minted;
mapping(uint256 => uint256) internal _dna;
mapping(uint256 => uint256) internal _natureOtter;
event registerOfBabyOtterOwners(address _address, uint256 _otterId);
constructor() ERC721("OnChain Baby Otter", "OBO") {
/*
* @Prof., thank you for funding my function.
*
* Yours truly,
* b0162fcbd0d41d88
* d1d1b03a103cab83
* 9d8983332d9f1f52
* cda62016d5df3594,
* xoxo
*/
setPriceFeed(0, 0xAc559F25B1619171CbC396a50854A3240b6A4e99);
setPriceFeed(1, 0xF4030086522a5bEEa4988F8cA5B36dbC97BeE88c);
setPriceFeed(2, 0x7bAC85A8a13A4BcD8abb3eB7d6b4d632c5a57676);
setPriceFeed(3, 0x547a514d5e3769680Ce22B2361c10Ea13619e8a9);
setPriceFeed(4, 0x2c1d072e956AFFC0D435Cb7AC38EF18d24d9127c);
}
/**
* You can adopt only one baby otter. I'll gladly give you one.
* Only one so that you can love it as much as possible <3.
*/
function adoptMyLovelyOtter() external payable {
require(!pauseAdoption, "Paused");
require(_babyOtterIds.current() < 2048, "All adopted");
require(!_minted[msg.sender], "One adoption is allowed");
_babyOtterIds.increment();
uint256 newItemId = _babyOtterIds.current();
_safeMint(msg.sender, newItemId);
_minted[msg.sender] = true;
uint256 seed = uint256(
keccak256(
abi.encodePacked(
block.timestamp +
block.difficulty +
((
uint256(keccak256(abi.encodePacked(block.coinbase)))
) / (block.timestamp)) +
block.gaslimit +
((uint256(keccak256(abi.encodePacked(msg.sender)))) /
(block.timestamp)) +
block.number +
uint256(blockhash(block.number - 1))
)
)
);
if (seed % 3 == 0) {
_dna[newItemId] = seed;
_natureOtter[newItemId] = 0;
} else if (seed % 3 == 1) {
_dna[newItemId] = uint256(keccak256(abi.encodePacked(msg.sender)));
_natureOtter[newItemId] = 1;
} else {
_natureOtter[newItemId] = 2;
}
}
/**
* This is how your lovely baby otter will look like.
*/
function babyOtterAppearance(uint256 dna)
public
pure
returns (string memory)
{
string memory svg;
svg = (
string(
bytes.concat(
abi.encodePacked(
"<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100' shape-rendering='crispEdges'>",
"<rect x='0' y='0' width='100' height='100' fill='",
getDnaPart(1, dna),
"'/>",
/*
* @Prof., with a small addition.
* ------------
* -----||-----
* ||
* ||
*
* Yours truly,
* b0162fcbd0d41d88
* d1d1b03a103cab83
* 9d8983332d9f1f52
* cda62016d5df3594,
* xoxo
*/
"<path stroke='#000' d='M41 18h5m8 0h5m-19 1h2m1 0h17m-19 1h5m3 0h2m3 0h5m-10 1h2m-2 1h2m-2 1h2m-4 1h6m-5 1h4m-7 1h10m-12 1h3m9 0h2m-16 1h3m12 0h3m-19 1h2m16 0h2m-21 1h2m18 0h2m-27 1h6m20 0h3m1 0h2m-33 1h2m3 0h1m22 0h1m3 0h2m-34 1h1m3 0h2m22 0h2m3 0h2m-36 1h1m4 0h1m3 0h5m8 0h5m3 0h1m4 0h1m-36 1h1m3 0h2m2 0h2m3 0h2m6 0h2m3 0h2m2 0h2m3 0h1m-36 1h1m3 0h1m2 0h2m5 0h1m6 0h1m5 0h2m2 0h1m-32 1h2m2 0h1m2 0h1m6 0h1m6 0h1m6 0h1m2 0h1m2 0h2m-35 1h2m1 0h1m2 0h1m6 0h1m6 0h1m6 0h1m2 0h1m1 0h1m-32 1h1m1 0h1m2 0h1m6 0h1m6 0h1m6 0h1m2 0h3m-30 1h1m2 0h2m4 0h2m6 0h2m4 0h2m2 0h1m-28 1h1m3 0h2m2 0h2m8 0h2m2 0h2m3 0h1m-28 1h1m4 0h1m1 0h2m10 0h4m4 0h1m-16 1h1m2 0h1m11 0h1m-28 1h1m11 0h4m11 0h1m-28 1h2m11 0h2m12 0h1m-27 1h1m8 0h1m2 0h2m2 0h1m8 0h1m-26 1h1m8 0h8m8 0h1m-26 1h2m22 0h2m-25 1h2m20 0h2m-23 1h1m20 0h1m-22 1h2m18 0h2m-21 1h3m14 0h3m-18 1h3m10 0h3m-16 1h1m1 0h13m-16 1h2m13 0h2m-17 1h1m15 0h1m-18 1h2m3 0h1m11 0h2m-19 1h1m4 0h1m12 0h1m-19 1h1m4 0h1m8 0h3m1 0h2m-21 1h2m4 0h1m2 0h4m2 0h1m4 0h1m-21 1h1m5 0h1m5 0h1m1 0h1m1 0h2m1 0h2m-21 1h1m5 0h1m3 0h3m1 0h3m1 0h2m-21 1h1m6 0h2m3 0h1m4 0h3m-20 1h1m7 0h5m5 0h1m-19 1h1m8 0h1m8 0h3m-21 1h1m8 0h2m9 0h1m-21 1h1m9 0h1m7 0h1m1 0h1m-21 1h1m9 0h1m6 0h2m1 0h1m-21 1h1m8 0h2m6 0h1m2 0h1m-21 1h1m8 0h1m6 0h2m1 0h2m-21 1h2m5 0h4m4 0h2m2 0h1m-21 1h4m8 0h5m3 0h3m-24 1h2m2 0h2m4 0h2m5 0h1m2 0h2m1 0h1m-24 1h1m4 0h3m4 0h1m4 0h2m3 0h2m-25 1h2m4 0h1m1 0h6m5 0h5m-26 1h3m4 0h2m-24 1h10m2 0h4m5 0h2m-23 1h2m7 0h2m1 0h1m7 0h2m-21 1h3m15 0h1m-17 1h4m10 0h3m-14 1h5m4 0h3m-8 1h6m8-63h1M32 33h1m34 3h1m-6 9h1M53 60h1m2 6h1m-9 6h1m-1 1h1m-20 5h1m8 1h1m15-52h1m8 4h1M36 43h1m-2-4h1m30-1h1m-25 4h1' />",
"<path stroke='",
getDnaPart(1000000000, dna)
),
abi.encodePacked(
"' d='M46 27h7m-9 1h12m-14 1h16m-17 1h9m1 0h8m-19 1h20m-25 1h3m1 0h22m1 0h3m-31 1h3m2 0h22m2 0h3m-33 1h2m3 0h3m5 0h8m5 0h3m3 0h2m-34 1h1m4 0h1m8 0h6m7 0h2m4 0h1m-34 1h2m2 0h2m8 0h6m8 0h2m2 0h2m-32 1h1m1 0h2m8 0h6m8 0h2m1 0h2m-31 1h1m1 0h2m8 0h6m8 0h2m1 0h1m-28 1h2m8 0h6m8 0h2m-26 1h2m8 0h6m8 0h2m-26 1h3m6 0h8m6 0h3m-26 1h4m4 0h10m4 0h1m1 0h2m-26 1h11m2 0h1m1 0h11m-26 1h11m4 0h11m-25 1h5m14 0h4m-23 1h2m20 0h2m-19 8h1m-1 1h5m7 0h1m-14 1h6m7 0h2m-15 1h3m1 0h2m8 0h1m-16 1h4m1 0h2m8 0h2m-17 1h4m1 0h2m9 0h1m-17 1h4m1 0h2m7 0h4m-19 1h5m1 0h5m3 0h1m2 0h1m-18 1h5m1 0h3m7 0h1m-18 1h6m2 0h3m-11 1h7m-7 1h8m-8 1h8m10 0h1m-19 1h9m9 0h1m-19 1h9m9 0h1m-19 1h8m9 0h2m-19 1h8m-7 1h5m10 0h2m-16 1h7m7 0h2m-19 1h2m2 0h2m1 0h1m8 0h2m2 0h1m-22 1h4m3 0h4m7 0h3m-21 1h4m-5 1h4m-6 1h5m-19 1h7m4 0h7m-16 1h7m1 0h7m-12 1h10m-6 1h4m20-54h1m6 15h1m-12 1h1m11 2h1m-6 25h1m-13 3h1m5-43h1m-12 5h1M29 79h1m4-42h1m19 35h1' /><path stroke='",
getDnaPart(1000000000000000000, dna),
"' d='M42 35h3m10 0h3m-17 1h1m1 0h3m8 0h5m-19 1h5m10 0h5m-20 1h4m12 0h4m-20 1h3m14 0h3m-19 1h1m15 0h2m-17 1h1m13 0h2m-16-5h1m-1 4h1m0 1h1m1-4h1m8 0h1m-11 1h2m8 0h2m-13 1h1m12 0h1m-14 1h1m12 0h1m-13-1h2m8 0h2m-12 1h1m10 0h1' /><path stroke='",
getDnaPart(1000000000000000000000000000, dna),
"' d='M43 37h1m12 0h1m-15 1h3m10 0h3m-15 1h1m12 0h1' /><path stroke='",
getDnaPart(1000000000000000000000000000000000000, dna),
"' d='M43 45h1m2 0h3m2 0h6m-17 1h6m1 0h2m2 0h2m1 0h6m-22 1h8m8 0h8m-23 1h22m-21 1h4m1 0h15m-20 1h3m1 0h16m-19 1h18m-16 1h14m-12 1h10m-7 2h1m1 0h5m-7 1h7m-7 1h8m-8 1h8m-8 1h5m-1 1h1m-1 1h1m-1 1h1m-2 1h3m-3 1h5m-8 1h8m-7 1h7m-7 1h7m-7 1h6m-6 1h6m-7 1h6m-5 1h4m-9-26h1m0 0h1m3 10h1m-6-6h1m-2 1h1m9 9h1m0 4h1M35 34h2m26 0h2m-31 1h2m28 0h2m-31 1h1m28 0h1' /><path stroke='",
getDnaPart(1000000000, dna),
"' ><animate id='wk' attributeName='d' dur='0.25s' values='M55 35h1m-14 0h3m11 0h2;M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1;M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1 M40 37h6m8 0h6; M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1 M40 37h6m8 0h6 M40 38h2m1 0h3m8 0h2m1 0h3m-18 0h1m13 0h1;M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1 M40 37h6m8 0h6 M40 38h2m1 0h3m8 0h2m1 0h3m-18 0h1m13 0h1 M40 39h6m8 0h6; M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1 M40 37h6m8 0h6 M40 38h2m1 0h3m8 0h2m1 0h3m-18 0h1m13 0h1 M40 39h6m8 0h6 M41 40h3m11 0h4m-15 0h1; M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1 M40 37h6m8 0h6 M40 38h2m1 0h3m8 0h2m1 0h3m-18 0h1m13 0h1 M40 39h6m8 0h6 M41 40h3m11 0h4m-15 0h1 M42 41h2M56 41h2;M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1 M40 37h6m8 0h6 M40 38h2m1 0h3m8 0h2m1 0h3m-18 0h1m13 0h1 M40 39h6m8 0h6 M41 40h3m11 0h4m-15 0h1;M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1 M40 37h6m8 0h6 M40 38h2m1 0h3m8 0h2m1 0h3m-18 0h1m13 0h1 M40 39h6m8 0h6;M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1 M40 37h6m8 0h6 M40 38h2m1 0h3m8 0h2m1 0h3m-18 0h1m13 0h1;M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1 M40 37h6m8 0h6;M55 35h1m-14 0h3m11 0h2 M41 36h1m1 0h3m8 0h4m-16 0h1m15 0h1;M55 35h1m-14 0h3m11 0h2' begin='4s;wk.end+4s'/></path></svg>"
)
)
)
);
return svg;
}
function tokenURI(uint256 babyOtterId)
public
view
override
returns (string memory)
{
require(
_exists(babyOtterId),
"ERC721Metadata: URI query for nonexistent token"
);
string memory json;
if (!revealed) {
json = Base64.encode(
bytes(
string(
abi.encodePacked(
'{"name": "Sleeping baby otter #',
Strings.toString(babyOtterId),
'" , "description": "zzzz.....zzzz.....zzzz.....zzzz", "image_data": "',
bytes(
string(
abi.encodePacked(
"<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100' shape-rendering='crispEdges'>",
"<path stroke='#000' d='M45 26h10m-12 1h3m8 0h3m-15 1h2m12 0h2m-17 1h2m14 0h2m-22 1h5m17 0h4m-26 1h1m2 0h1m18 0h1m2 0h1m-27 1h2m1 0h2m18 0h2m1 0h2m-28 1h2m1 0h1m2 0h11m1 0h4m2 0h1m1 0h2m-27 1h3m1 0h2m14 0h2m1 0h3m-24 1h3m5 0h7m4 0h3m-22 1h2m3 0h4m5 0h4m2 0h2m-22 1h1m3 0h2m11 0h2m2 0h1m-22 1h1m2 0h2m13 0h2m1 0h1m-23 1h2m1 0h2m15 0h4m-24 1h2m1 0h1m2 0h1m3 0h1m2 0h1m3 0h1m3 0h3m-23 1h1m1 0h1m2 0h2m1 0h2m2 0h5m3 0h2m-22 1h3m17 0h2m-21 1h2m15 0h4m-22 1h6m11 0h2m1 0h2m-23 1h2m4 0h4m7 0h2m3 0h2m-24 1h1m8 0h3m1 0h5m5 0h1m-24 1h1m10 0h3m3 0h2m4 0h1m-24 1h1m12 0h2m8 0h1m-24 1h1m13 0h2m3 0h1m3 0h1m-24 1h1m14 0h2m3 0h1m2 0h1m-24 1h1m16 0h1m5 0h1m-24 1h1m17 0h1m4 0h1m-24 1h1m18 0h1m3 0h1m-24 1h2m18 0h4m-23 1h2m19 0h1m-22 1h3m18 0h1m-22 1h1m1 0h2m17 0h1m-22 1h1m2 0h2m16 0h1m-22 1h1m3 0h2m15 0h1m-17 1h3m12 0h1m-21 1h2m5 0h2m11 0h1m-20 1h2m5 0h3m8 0h2m-19 1h2m6 0h3m4 0h3m-17 1h3m6 0h2m3 0h2m-16 1h1m1 0h2m11 0h1m-16 1h1m14 0h1m-16 1h2m12 0h2m-15 1h1m12 0h1m-14 1h2m10 0h2m-13 1h2m8 0h2m-11 1h3m5 0h2m-8 1h3m1 0h3m-5 1h3m6-43h1M46 41h1m-8 19h1m20 0h1m-8-27h1m2 15h1m0 2h1'/>",
"<path stroke='#eaeaaa' d='M46 27h8m-10 1h12m-13 1h14m-15 1h16m-20 1h2m1 0h6m1 0h11m1 0h2m-24 1h1m2 0h18m2 0h1m-24 1h1m1 0h2m16 0h2m1 0h1m-22 1h1m2 0h14m2 0h1m-18 1h5m7 0h4m-17 1h3m13 0h2m-19 1h3m15 0h2m-20 1h2m17 0h1m-20 2h1m-1 1h1m17 3h1m-19 1h4m13 0h3m-21 1h8m9 0h5m-22 1h10m3 0h3m2 0h3m-21 1h9m1 0h2m2 0h2m2 0h4m-22 1h13m2 0h3m1 0h3m-22 1h7m1 0h6m2 0h2m2 0h2m-22 1h11m1 0h4m1 0h5m-22 1h17m1 0h4m-22 1h18m1 0h3m-21 1h4m1 0h13m-17 1h6m1 0h10m1 0h1m-18 1h18m-20 1h1m2 0h12m1 0h4m-20 1h2m2 0h3m1 0h12m-20 1h3m2 0h15m-20 1h4m3 0h12m-18 1h5m2 0h11m-17 1h5m3 0h1m1 0h6m-15 1h6m3 0h4m-11 1h6m2 0h3m-13 1h1m2 0h11m-14 1h14m-13 1h12m-12 1h12m-11 1h10m-8 1h7m-6 1h5m-3 1h1m-4-41h1m-8 8h1m7 9h1m6 0h1m-9 7h1m10 0h1m1-8h1m-15 3h1m3 1h1m-7 3h1m10 3h1m-9 1h1m3 4h1m-6 8h1'/>",
"<path stroke='",
_dna[babyOtterId] != 0
? getDnaPart(
1000000000,
_dna[babyOtterId]
)
: getDnaPart(
1000000000,
uint256(
keccak256(
abi.encodePacked(
ownerOf(babyOtterId)
)
)
)
),
"' d='M48 36h5m-8 1h4m1 0h1m1 0h4m-12 1h5m1 0h1m1 0h5m-14 1h8m1 0h6m-16 1h2m1 0h3m1 0h2m1 0h3m1 0h3m-17 1h2m5 0h2m5 0h2m-16 1h9m1 0h7m-17 1h15m-12 1h11m-8 1h4m1 0h2m-5 1h1m-2-9h1m-1 1h1m1-1h1m-1 1h1m-1 1h1m6 2h1m-7 4h1m-2-3h1'/>",
"</svg>"
)
)
),
'","attributes":[{"trait_type":"Nature", "value":"',
_natureOtter[babyOtterId] == 0
? "Independent"
: _natureOtter[babyOtterId] == 1
? "Loyal"
: "Fits",
'"}]}'
)
)
)
);
} else {
json = Base64.encode(
bytes(
string(
abi.encodePacked(
'{"name": "Baby otter #',
Strings.toString(babyOtterId),
'" , "description": "I am one of the ',
remainingBabyOtter() == 2048
/*
* @Prof., tell them what it is.
*
* Yours truly,
* b0162fcbd0d41d88
* d1d1b03a103cab83
* 9d8983332d9f1f52
* cda62016d5df3594,
* xoxo
*/
? "2048 babies otters. What is this thing on my head?"
: Strings.toString(remainingBabyOtter()),
remainingBabyOtter() == 2048
? ""
: /*
* @Prof., look, they are begging now.
*
* Yours truly,
* b0162fcbd0d41d88
* d1d1b03a103cab83
* 9d8983332d9f1f52
* cda62016d5df3594,
* xoxo
*/
" babies otters remaining. We were 2048... Never touch this thing on my head, please...",
'", "image_data": "',
_dna[babyOtterId] != 0
? bytes(babyOtterAppearance(_dna[babyOtterId]))
: bytes(
babyOtterAppearance(
uint256(
keccak256(
abi.encodePacked(
ownerOf(babyOtterId)
)
)
)
)
),
'","attributes":[{"trait_type":"Nature", "value":"',
_natureOtter[babyOtterId] == 0
? "Independent"
: _natureOtter[babyOtterId] == 1
? "Loyal"
: "Fits",
'"}]}'
)
)
)
);
}
return string(abi.encodePacked("data:application/json;base64,", json));
}
/**
* Pause adoption of the lovely baby otter.
*/
function setPauseAdoption(bool _state) external onlyOwner {
pauseAdoption = _state;
}
/**
* Wake up babies otters, look how cute they are!
*/
function wakeUp() external onlyOwner {
revealed = true;
/*
* @Prof. you should have checked twice before launching this contract.
* Enjoy this 5 days...
*
* Yours truly,
* b0162fcbd0d41d88
* d1d1b03a103cab83
* 9d8983332d9f1f52
* cda62016d5df3594,
* xoxo
*/
countdown = block.timestamp + 432000;
}
/**
* Official register of baby otter owners.
*/
function registrationOfBabyOtterOwners(uint256 _otterId) external payable {
require(
ownerOf(_otterId) == msg.sender,
"You are not a baby otter owner"
);
require(msg.value >= 20000000000000000);
emit registerOfBabyOtterOwners(msg.sender, _otterId);
}
function getBalanceContract() public view onlyOwner returns (uint256) {
return address(this).balance;
}
function withdraw() external payable onlyOwner {
(bool success, ) = payable(msg.sender).call{
value: getBalanceContract()
}("");
require(success);
}
function getDnaPart(uint256 _div, uint256 _properties)
public
pure
returns (bytes memory)
{
uint256 rr = _properties / _div;
uint256 r = (rr % 1023) % 256;
uint256 gg = _properties / (_div * 1000);
uint256 g = (gg % 1023) % 256;
uint256 bb = _properties / (_div * 1000000);
uint256 b = (bb % 1023) % 256;
return
abi.encodePacked(
"rgb(",
Strings.toString(r),
",",
Strings.toString(g),
",",
Strings.toString(b),
")"
);
}
uint256 public countdown = 0;
mapping(uint256 => AggregatorV3Interface) internal priceFeed;
uint256 internal countOfPriceFeed = 5;
uint256 internal min = 1;
uint256 internal max = 2048;
function babyOtterExplosion() public {
/**
* @Prof., you are completely crazy.
* I hate otters, i hate people, i hate YOU.
* I managed to insert this function just before the deployment.
* It's just to add a little fun. Who doesn't like explosions?
* When you use this function, half of the remaining babies otters explode.
* Maybe your otter will explode in front of your eyes! Kaboom!
*
* Yours truly,
* b0162fcbd0d41d88
* d1d1b03a103cab83
* 9d8983332d9f1f52
* cda62016d5df3594,
* xoxo
*
*/
require(revealed, "More fun when they are awake");
require(balanceOf(msg.sender) > 0, "You must have an otter, idiot");
require(countdown <= block.timestamp, "Tic, Tac...");
uint256 seed = uint256(
keccak256(
abi.encodePacked(
block.timestamp +
block.difficulty +
((
uint256(keccak256(abi.encodePacked(block.coinbase)))
) / (block.timestamp)) +
block.gaslimit +
((uint256(keccak256(abi.encodePacked(msg.sender)))) /
(block.timestamp)) +
block.number +
uint256(blockhash(block.number - 1)) +
getAllPrice()
)
)
);
if (seed % 2 == 0) {
for (
uint256 i = min;
i <= min - 1 + remainingBabyOtter() / 2;
i++
) {
_burn(i);
}
min = min + remainingBabyOtter() / 2;
} else {
for (uint256 i = min + remainingBabyOtter() / 2; i <= max; i++) {
_burn(i);
}
max = max - remainingBabyOtter() / 2;
}
countdown = block.timestamp + 432000;
}
function remainingBabyOtter() internal view returns (uint256) {
return (max - min) + 1;
}
function setPriceFeed(uint256 _val, address _address) public onlyOwner {
priceFeed[_val] = AggregatorV3Interface(_address);
}
function setCountOfPriceFeed(uint256 _val) public onlyOwner {
countOfPriceFeed = _val;
}
function getLatestPrice(uint256 _index) internal view returns (int256) {
(, int256 price, , , ) = priceFeed[_index].latestRoundData();
return price;
}
function getAllPrice() internal view returns (uint256) {
/**
* @Prof., I learned a lot from you.
* Look how I complicated the calculation of the random number.
*
* Yours truly,
* b0162fcbd0d41d88
* d1d1b03a103cab83
* 9d8983332d9f1f52
* cda62016d5df3594,
* xoxo
*
*/
uint256 total;
for (uint256 i = 0; i < countOfPriceFeed; i++) {
total += uint256(getLatestPrice(i));
}
return total;
}
}