ERC-20
Overview
Max Total Supply
404 ERROR
Holders
158
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
0.8 ERRORValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Source Code Verified (Exact Match)
Contract Name:
ERROR
Compiler Version
v0.8.24+commit.e11b9ed9
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.20; // File @openzeppelin/contracts/utils/[email protected] // OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol) /** * @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; } function _contextSuffixLength() internal view virtual returns (uint256) { return 0; } } // File @openzeppelin/contracts/access/[email protected] // OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol) /** * @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. * * The initial owner is set to the address provided by the deployer. 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; /** * @dev The caller account is not authorized to perform an operation. */ error OwnableUnauthorizedAccount(address account); /** * @dev The owner is not a valid owner account. (eg. `address(0)`) */ error OwnableInvalidOwner(address owner); event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the address provided by the deployer as the initial owner. */ constructor(address initialOwner) { if (initialOwner == address(0)) { revert OwnableInvalidOwner(address(0)); } _transferOwnership(initialOwner); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { if (owner() != _msgSender()) { revert OwnableUnauthorizedAccount(_msgSender()); } } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby disabling 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 { if (newOwner == address(0)) { revert OwnableInvalidOwner(address(0)); } _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/introspection/[email protected] // OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/IERC165.sol) /** * @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/[email protected] // OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721Receiver.sol) /** * @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/math/[email protected] // OpenZeppelin Contracts (last updated v5.0.0) (utils/math/Math.sol) /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Muldiv operation overflow. */ error MathOverflowedMulDiv(); enum Rounding { Floor, // Toward negative infinity Ceil, // Toward positive infinity Trunc, // Toward zero Expand // Away from zero } /** * @dev Returns the addition of two unsigned integers, with an overflow flag. */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } } /** * @dev Returns the subtraction of two unsigned integers, with an overflow flag. */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b > a) return (false, 0); return (true, a - b); } } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a / b); } } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a % b); } } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds towards infinity instead * of rounding towards zero. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { if (b == 0) { // Guarantee the same behavior as in a regular Solidity division. return a / b; } // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or * denominator == 0. * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) with further edits by * Uniswap Labs also under MIT license. */ function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0 = x * y; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { // Solidity will revert if denominator == 0, unlike the div opcode on its own. // The surrounding unchecked block does not change this fact. // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic. return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. if (denominator <= prod1) { revert MathOverflowedMulDiv(); } /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. // Always >= 1. See https://cs.stackexchange.com/q/138556/92363. uint256 twos = denominator & (0 - denominator); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also // works in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (unsignedRoundsUp(rounding) && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded * towards zero. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` //  `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` //  `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (unsignedRoundsUp(rounding) && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2 of a positive value rounded towards zero. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (unsignedRoundsUp(rounding) && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10 of a positive value rounded towards zero. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10 ** 64) { value /= 10 ** 64; result += 64; } if (value >= 10 ** 32) { value /= 10 ** 32; result += 32; } if (value >= 10 ** 16) { value /= 10 ** 16; result += 16; } if (value >= 10 ** 8) { value /= 10 ** 8; result += 8; } if (value >= 10 ** 4) { value /= 10 ** 4; result += 4; } if (value >= 10 ** 2) { value /= 10 ** 2; result += 2; } if (value >= 10 ** 1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (unsignedRoundsUp(rounding) && 10 ** result < value ? 1 : 0); } } /** * @dev Return the log in base 256 of a positive value rounded towards zero. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 256, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (unsignedRoundsUp(rounding) && 1 << (result << 3) < value ? 1 : 0); } } /** * @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers. */ function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) { return uint8(rounding) % 2 == 1; } } // File @openzeppelin/contracts/utils/math/[email protected] // OpenZeppelin Contracts (last updated v5.0.0) (utils/math/SignedMath.sol) /** * @dev Standard signed math utilities missing in the Solidity language. */ library SignedMath { /** * @dev Returns the largest of two signed numbers. */ function max(int256 a, int256 b) internal pure returns (int256) { return a > b ? a : b; } /** * @dev Returns the smallest of two signed numbers. */ function min(int256 a, int256 b) internal pure returns (int256) { return a < b ? a : b; } /** * @dev Returns the average of two signed numbers without overflow. * The result is rounded towards zero. */ function average(int256 a, int256 b) internal pure returns (int256) { // Formula from the book "Hacker's Delight" int256 x = (a & b) + ((a ^ b) >> 1); return x + (int256(uint256(x) >> 255) & (a ^ b)); } /** * @dev Returns the absolute unsigned value of a signed value. */ function abs(int256 n) internal pure returns (uint256) { unchecked { // must be unchecked in order to support `n = type(int256).min` return uint256(n >= 0 ? n : -n); } } } // File @openzeppelin/contracts/utils/[email protected] // OpenZeppelin Contracts (last updated v5.0.0) (utils/Strings.sol) /** * @dev String operations. */ library Strings { bytes16 private constant HEX_DIGITS = "0123456789abcdef"; uint8 private constant ADDRESS_LENGTH = 20; /** * @dev The `value` string doesn't fit in the specified `length`. */ error StringsInsufficientHexLength(uint256 value, uint256 length); /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { unchecked { uint256 length = Math.log10(value) + 1; string memory buffer = new string(length); uint256 ptr; /// @solidity memory-safe-assembly assembly { ptr := add(buffer, add(32, length)) } while (true) { ptr--; /// @solidity memory-safe-assembly assembly { mstore8(ptr, byte(mod(value, 10), HEX_DIGITS)) } value /= 10; if (value == 0) break; } return buffer; } } /** * @dev Converts a `int256` to its ASCII `string` decimal representation. */ function toStringSigned(int256 value) internal pure returns (string memory) { return string.concat(value < 0 ? "-" : "", toString(SignedMath.abs(value))); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { unchecked { return toHexString(value, Math.log256(value) + 1); } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { uint256 localValue = value; 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_DIGITS[localValue & 0xf]; localValue >>= 4; } if (localValue != 0) { revert StringsInsufficientHexLength(value, length); } 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); } /** * @dev Returns true if the two strings are equal. */ function equal(string memory a, string memory b) internal pure returns (bool) { return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b)); } } // File contracts/interfaces/IERC404.sol interface IERC404 is IERC165 { error NotFound(); error InvalidTokenId(); error AlreadyExists(); error InvalidRecipient(); error InvalidSender(); error InvalidSpender(); error InvalidOperator(); error UnsafeRecipient(); error RecipientIsERC721TransferExempt(); error Unauthorized(); error InsufficientAllowance(); error DecimalsTooLow(); error PermitDeadlineExpired(); error InvalidSigner(); error InvalidApproval(); error OwnedIndexOverflow(); error MintLimitReached(); error InvalidExemption(); function name() external view returns (string memory); function symbol() external view returns (string memory); function decimals() external view returns (uint8); function totalSupply() external view returns (uint256); function erc20TotalSupply() external view returns (uint256); function erc721TotalSupply() external view returns (uint256); function balanceOf(address owner_) external view returns (uint256); function erc721BalanceOf(address owner_) external view returns (uint256); function erc20BalanceOf(address owner_) external view returns (uint256); function erc721TransferExempt(address account_) external view returns (bool); function isApprovedForAll( address owner_, address operator_ ) external view returns (bool); function allowance( address owner_, address spender_ ) external view returns (uint256); function owned(address owner_) external view returns (uint256[] memory); function ownerOf(uint256 id_) external view returns (address erc721Owner); function tokenURI(uint256 id_) external view returns (string memory); function approve( address spender_, uint256 valueOrId_ ) external returns (bool); function erc20Approve( address spender_, uint256 value_ ) external returns (bool); function erc721Approve(address spender_, uint256 id_) external; function setApprovalForAll(address operator_, bool approved_) external; function transferFrom( address from_, address to_, uint256 valueOrId_ ) external returns (bool); function erc20TransferFrom( address from_, address to_, uint256 value_ ) external returns (bool); function erc721TransferFrom(address from_, address to_, uint256 id_) external; function transfer(address to_, uint256 amount_) external returns (bool); function getERC721QueueLength() external view returns (uint256); function getERC721TokensInQueue( uint256 start_, uint256 count_ ) external view returns (uint256[] memory); function setSelfERC721TransferExempt(bool state_) external; function safeTransferFrom(address from_, address to_, uint256 id_) external; function safeTransferFrom( address from_, address to_, uint256 id_, bytes calldata data_ ) external; function DOMAIN_SEPARATOR() external view returns (bytes32); function permit( address owner_, address spender_, uint256 value_, uint256 deadline_, uint8 v_, bytes32 r_, bytes32 s_ ) external; } // File contracts/lib/DoubleEndedQueue.sol // OpenZeppelin Contracts (last updated v5.0.0) (utils/structs/DoubleEndedQueue.sol) // Modified by Pandora Labs to support native uint256 operations /** * @dev A sequence of items with the ability to efficiently push and pop items (i.e. insert and remove) on both ends of * the sequence (called front and back). Among other access patterns, it can be used to implement efficient LIFO and * FIFO queues. Storage use is optimized, and all operations are O(1) constant time. This includes {clear}, given that * the existing queue contents are left in storage. * * The struct is called `Uint256Deque`. This data structure can only be used in storage, and not in memory. * * ```solidity * DoubleEndedQueue.Uint256Deque queue; * ``` */ library DoubleEndedQueue { /** * @dev An operation (e.g. {front}) couldn't be completed due to the queue being empty. */ error QueueEmpty(); /** * @dev A push operation couldn't be completed due to the queue being full. */ error QueueFull(); /** * @dev An operation (e.g. {at}) couldn't be completed due to an index being out of bounds. */ error QueueOutOfBounds(); /** * @dev Indices are 128 bits so begin and end are packed in a single storage slot for efficient access. * * Struct members have an underscore prefix indicating that they are "private" and should not be read or written to * directly. Use the functions provided below instead. Modifying the struct manually may violate assumptions and * lead to unexpected behavior. * * The first item is at data[begin] and the last item is at data[end - 1]. This range can wrap around. */ struct Uint256Deque { uint128 _begin; uint128 _end; mapping(uint128 index => uint256) _data; } /** * @dev Inserts an item at the end of the queue. * * Reverts with {QueueFull} if the queue is full. */ function pushBack(Uint256Deque storage deque, uint256 value) internal { unchecked { uint128 backIndex = deque._end; if (backIndex + 1 == deque._begin) revert QueueFull(); deque._data[backIndex] = value; deque._end = backIndex + 1; } } /** * @dev Removes the item at the end of the queue and returns it. * * Reverts with {QueueEmpty} if the queue is empty. */ function popBack( Uint256Deque storage deque ) internal returns (uint256 value) { unchecked { uint128 backIndex = deque._end; if (backIndex == deque._begin) revert QueueEmpty(); --backIndex; value = deque._data[backIndex]; delete deque._data[backIndex]; deque._end = backIndex; } } /** * @dev Inserts an item at the beginning of the queue. * * Reverts with {QueueFull} if the queue is full. */ function pushFront(Uint256Deque storage deque, uint256 value) internal { unchecked { uint128 frontIndex = deque._begin - 1; if (frontIndex == deque._end) revert QueueFull(); deque._data[frontIndex] = value; deque._begin = frontIndex; } } /** * @dev Removes the item at the beginning of the queue and returns it. * * Reverts with `QueueEmpty` if the queue is empty. */ function popFront( Uint256Deque storage deque ) internal returns (uint256 value) { unchecked { uint128 frontIndex = deque._begin; if (frontIndex == deque._end) revert QueueEmpty(); value = deque._data[frontIndex]; delete deque._data[frontIndex]; deque._begin = frontIndex + 1; } } /** * @dev Returns the item at the beginning of the queue. * * Reverts with `QueueEmpty` if the queue is empty. */ function front( Uint256Deque storage deque ) internal view returns (uint256 value) { if (empty(deque)) revert QueueEmpty(); return deque._data[deque._begin]; } /** * @dev Returns the item at the end of the queue. * * Reverts with `QueueEmpty` if the queue is empty. */ function back( Uint256Deque storage deque ) internal view returns (uint256 value) { if (empty(deque)) revert QueueEmpty(); unchecked { return deque._data[deque._end - 1]; } } /** * @dev Return the item at a position in the queue given by `index`, with the first item at 0 and last item at * `length(deque) - 1`. * * Reverts with `QueueOutOfBounds` if the index is out of bounds. */ function at( Uint256Deque storage deque, uint256 index ) internal view returns (uint256 value) { if (index >= length(deque)) revert QueueOutOfBounds(); // By construction, length is a uint128, so the check above ensures that index can be safely downcast to uint128 unchecked { return deque._data[deque._begin + uint128(index)]; } } /** * @dev Resets the queue back to being empty. * * NOTE: The current items are left behind in storage. This does not affect the functioning of the queue, but misses * out on potential gas refunds. */ function clear(Uint256Deque storage deque) internal { deque._begin = 0; deque._end = 0; } /** * @dev Returns the number of items in the queue. */ function length(Uint256Deque storage deque) internal view returns (uint256) { unchecked { return uint256(deque._end - deque._begin); } } /** * @dev Returns true if the queue is empty. */ function empty(Uint256Deque storage deque) internal view returns (bool) { return deque._end == deque._begin; } } // File contracts/lib/ERC20Events.sol library ERC20Events { event Approval(address indexed owner, address indexed spender, uint256 value); event Transfer(address indexed from, address indexed to, uint256 amount); } // File contracts/lib/ERC721Events.sol library ERC721Events { event ApprovalForAll( address indexed owner, address indexed operator, bool approved ); event Approval( address indexed owner, address indexed spender, uint256 indexed id ); event Transfer(address indexed from, address indexed to, uint256 indexed id); } // File contracts/ERC404.sol abstract contract ERC404 is IERC404 { using DoubleEndedQueue for DoubleEndedQueue.Uint256Deque; /// @dev The queue of ERC-721 tokens stored in the contract. DoubleEndedQueue.Uint256Deque private _storedERC721Ids; /// @dev Token name string public name; /// @dev Token symbol string public symbol; /// @dev Decimals for ERC-20 representation uint8 public immutable decimals; /// @dev Units for ERC-20 representation uint256 public immutable units; /// @dev Total supply in ERC-20 representation uint256 public totalSupply; /// @dev Current mint counter which also represents the highest /// minted id, monotonically increasing to ensure accurate ownership uint256 public minted; /// @dev Initial chain id for EIP-2612 support uint256 internal immutable _INITIAL_CHAIN_ID; /// @dev Initial domain separator for EIP-2612 support bytes32 internal immutable _INITIAL_DOMAIN_SEPARATOR; /// @dev Balance of user in ERC-20 representation mapping(address => uint256) public balanceOf; /// @dev Allowance of user in ERC-20 representation mapping(address => mapping(address => uint256)) public allowance; /// @dev Approval in ERC-721 representaion mapping(uint256 => address) public getApproved; /// @dev Approval for all in ERC-721 representation mapping(address => mapping(address => bool)) public isApprovedForAll; /// @dev Packed representation of ownerOf and owned indices mapping(uint256 => uint256) internal _ownedData; /// @dev Array of owned ids in ERC-721 representation mapping(address => uint256[]) internal _owned; /// @dev Addresses that are exempt from ERC-721 transfer, typically for gas savings (pairs, routers, etc) mapping(address => bool) internal _erc721TransferExempt; /// @dev EIP-2612 nonces mapping(address => uint256) public nonces; /// @dev Address bitmask for packed ownership data uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1; /// @dev Owned index bitmask for packed ownership data uint256 private constant _BITMASK_OWNED_INDEX = ((1 << 96) - 1) << 160; /// @dev Constant for token id encoding uint256 public constant ID_ENCODING_PREFIX = 1 << 255; constructor(string memory name_, string memory symbol_, uint8 decimals_) { name = name_; symbol = symbol_; if (decimals_ < 18) { revert DecimalsTooLow(); } decimals = decimals_; units = 10 ** decimals; // EIP-2612 initialization _INITIAL_CHAIN_ID = block.chainid; _INITIAL_DOMAIN_SEPARATOR = _computeDomainSeparator(); } /// @notice Function to find owner of a given ERC-721 token function ownerOf( uint256 id_ ) public view virtual returns (address erc721Owner) { erc721Owner = _getOwnerOf(id_); if (!_isValidTokenId(id_)) { revert InvalidTokenId(); } if (erc721Owner == address(0)) { revert NotFound(); } } function owned( address owner_ ) public view virtual returns (uint256[] memory) { return _owned[owner_]; } function erc721BalanceOf( address owner_ ) public view virtual returns (uint256) { return _owned[owner_].length; } function erc20BalanceOf( address owner_ ) public view virtual returns (uint256) { return balanceOf[owner_]; } function erc20TotalSupply() public view virtual returns (uint256) { return totalSupply; } function erc721TotalSupply() public view virtual returns (uint256) { return minted; } function getERC721QueueLength() public view virtual returns (uint256) { return _storedERC721Ids.length(); } function getERC721TokensInQueue( uint256 start_, uint256 count_ ) public view virtual returns (uint256[] memory) { uint256[] memory tokensInQueue = new uint256[](count_); for (uint256 i = start_; i < start_ + count_; ) { tokensInQueue[i - start_] = _storedERC721Ids.at(i); unchecked { ++i; } } return tokensInQueue; } /// @notice tokenURI must be implemented by child contract function tokenURI(uint256 id_) public view virtual returns (string memory); /// @notice Function for token approvals /// @dev This function assumes the operator is attempting to approve /// an ERC-721 if valueOrId_ is a possibly valid ERC-721 token id. /// Unlike setApprovalForAll, spender_ must be allowed to be 0x0 so /// that approval can be revoked. function approve( address spender_, uint256 valueOrId_ ) public virtual returns (bool) { if (_isValidTokenId(valueOrId_)) { erc721Approve(spender_, valueOrId_); } else { return erc20Approve(spender_, valueOrId_); } return true; } function erc721Approve(address spender_, uint256 id_) public virtual { // Intention is to approve as ERC-721 token (id). address erc721Owner = _getOwnerOf(id_); if ( msg.sender != erc721Owner && !isApprovedForAll[erc721Owner][msg.sender] ) { revert Unauthorized(); } getApproved[id_] = spender_; emit ERC721Events.Approval(erc721Owner, spender_, id_); } /// @dev Providing type(uint256).max for approval value results in an /// unlimited approval that is not deducted from on transfers. function erc20Approve( address spender_, uint256 value_ ) public virtual returns (bool) { // Prevent granting 0x0 an ERC-20 allowance. if (spender_ == address(0)) { revert InvalidSpender(); } allowance[msg.sender][spender_] = value_; emit ERC20Events.Approval(msg.sender, spender_, value_); return true; } /// @notice Function for ERC-721 approvals function setApprovalForAll(address operator_, bool approved_) public virtual { // Prevent approvals to 0x0. if (operator_ == address(0)) { revert InvalidOperator(); } isApprovedForAll[msg.sender][operator_] = approved_; emit ERC721Events.ApprovalForAll(msg.sender, operator_, approved_); } /// @notice Function for mixed transfers from an operator that may be different than 'from'. /// @dev This function assumes the operator is attempting to transfer an ERC-721 /// if valueOrId is a possible valid token id. function transferFrom( address from_, address to_, uint256 valueOrId_ ) public virtual returns (bool) { if (_isValidTokenId(valueOrId_)) { erc721TransferFrom(from_, to_, valueOrId_); } else { // Intention is to transfer as ERC-20 token (value). return erc20TransferFrom(from_, to_, valueOrId_); } return true; } /// @notice Function for ERC-721 transfers from. /// @dev This function is recommended for ERC721 transfers. function erc721TransferFrom( address from_, address to_, uint256 id_ ) public virtual { // Prevent minting tokens from 0x0. if (from_ == address(0)) { revert InvalidSender(); } // Prevent burning tokens to 0x0. if (to_ == address(0)) { revert InvalidRecipient(); } if (from_ != _getOwnerOf(id_)) { revert Unauthorized(); } // Check that the operator is either the sender or approved for the transfer. if ( msg.sender != from_ && !isApprovedForAll[from_][msg.sender] && msg.sender != getApproved[id_] ) { revert Unauthorized(); } // We only need to check ERC-721 transfer exempt status for the recipient // since the sender being ERC-721 transfer exempt means they have already // had their ERC-721s stripped away during the rebalancing process. if (erc721TransferExempt(to_)) { revert RecipientIsERC721TransferExempt(); } // Transfer 1 * units ERC-20 and 1 ERC-721 token. // ERC-721 transfer exemptions handled above. Can't make it to this point if either is transfer exempt. _transferERC20(from_, to_, units); _transferERC721(from_, to_, id_); } /// @notice Function for ERC-20 transfers from. /// @dev This function is recommended for ERC20 transfers function erc20TransferFrom( address from_, address to_, uint256 value_ ) public virtual returns (bool) { // Prevent minting tokens from 0x0. if (from_ == address(0)) { revert InvalidSender(); } // Prevent burning tokens to 0x0. if (to_ == address(0)) { revert InvalidRecipient(); } uint256 allowed = allowance[from_][msg.sender]; // Check that the operator has sufficient allowance. if (allowed != type(uint256).max) { allowance[from_][msg.sender] = allowed - value_; } // Transferring ERC-20s directly requires the _transferERC20WithERC721 function. // Handles ERC-721 exemptions internally. return _transferERC20WithERC721(from_, to_, value_); } /// @notice Function for ERC-20 transfers. /// @dev This function assumes the operator is attempting to transfer as ERC-20 /// given this function is only supported on the ERC-20 interface. /// Treats even large amounts that are valid ERC-721 ids as ERC-20s. function transfer(address to_, uint256 value_) public virtual returns (bool) { // Prevent burning tokens to 0x0. if (to_ == address(0)) { revert InvalidRecipient(); } // Transferring ERC-20s directly requires the _transferERC20WithERC721 function. // Handles ERC-721 exemptions internally. return _transferERC20WithERC721(msg.sender, to_, value_); } /// @notice Function for ERC-721 transfers with contract support. /// This function only supports moving valid ERC-721 ids, as it does not exist on the ERC-20 /// spec and will revert otherwise. function safeTransferFrom( address from_, address to_, uint256 id_ ) public virtual { safeTransferFrom(from_, to_, id_, ""); } /// @notice Function for ERC-721 transfers with contract support and callback data. /// This function only supports moving valid ERC-721 ids, as it does not exist on the /// ERC-20 spec and will revert otherwise. function safeTransferFrom( address from_, address to_, uint256 id_, bytes memory data_ ) public virtual { if (!_isValidTokenId(id_)) { revert InvalidTokenId(); } transferFrom(from_, to_, id_); if ( to_.code.length != 0 && IERC721Receiver(to_).onERC721Received(msg.sender, from_, id_, data_) != IERC721Receiver.onERC721Received.selector ) { revert UnsafeRecipient(); } } /// @notice Function for EIP-2612 permits (ERC-20 only). /// @dev Providing type(uint256).max for permit value results in an /// unlimited approval that is not deducted from on transfers. function permit( address owner_, address spender_, uint256 value_, uint256 deadline_, uint8 v_, bytes32 r_, bytes32 s_ ) public virtual { if (deadline_ < block.timestamp) { revert PermitDeadlineExpired(); } // permit cannot be used for ERC-721 token approvals, so ensure // the value does not fall within the valid range of ERC-721 token ids. if (_isValidTokenId(value_)) { revert InvalidApproval(); } if (spender_ == address(0)) { revert InvalidSpender(); } unchecked { address recoveredAddress = ecrecover( keccak256( abi.encodePacked( "\x19\x01", DOMAIN_SEPARATOR(), keccak256( abi.encode( keccak256( "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)" ), owner_, spender_, value_, nonces[owner_]++, deadline_ ) ) ) ), v_, r_, s_ ); if (recoveredAddress == address(0) || recoveredAddress != owner_) { revert InvalidSigner(); } allowance[recoveredAddress][spender_] = value_; } emit ERC20Events.Approval(owner_, spender_, value_); } /// @notice Returns domain initial domain separator, or recomputes if chain id is not equal to initial chain id function DOMAIN_SEPARATOR() public view virtual returns (bytes32) { return block.chainid == _INITIAL_CHAIN_ID ? _INITIAL_DOMAIN_SEPARATOR : _computeDomainSeparator(); } function supportsInterface( bytes4 interfaceId ) public view virtual returns (bool) { return interfaceId == type(IERC404).interfaceId || interfaceId == type(IERC165).interfaceId; } /// @notice Function for self-exemption function setSelfERC721TransferExempt(bool state_) public virtual { _setERC721TransferExempt(msg.sender, state_); } /// @notice Function to check if address is transfer exempt function erc721TransferExempt( address target_ ) public view virtual returns (bool) { return target_ == address(0) || _erc721TransferExempt[target_]; } /// @notice For a token token id to be considered valid, it just needs /// to fall within the range of possible token ids, it does not /// necessarily have to be minted yet. function _isValidTokenId(uint256 id_) internal pure returns (bool) { return id_ > ID_ENCODING_PREFIX && id_ != type(uint256).max; } /// @notice Internal function to compute domain separator for EIP-2612 permits function _computeDomainSeparator() internal view virtual returns (bytes32) { return keccak256( abi.encode( keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" ), keccak256(bytes(name)), keccak256("1"), block.chainid, address(this) ) ); } /// @notice This is the lowest level ERC-20 transfer function, which /// should be used for both normal ERC-20 transfers as well as minting. /// Note that this function allows transfers to and from 0x0. function _transferERC20( address from_, address to_, uint256 value_ ) internal virtual { // Minting is a special case for which we should not check the balance of // the sender, and we should increase the total supply. if (from_ == address(0)) { totalSupply += value_; } else { // Deduct value from sender's balance. balanceOf[from_] -= value_; } // Update the recipient's balance. // Can be unchecked because on mint, adding to totalSupply is checked, and on transfer balance deduction is checked. unchecked { balanceOf[to_] += value_; } emit ERC20Events.Transfer(from_, to_, value_); } /// @notice Consolidated record keeping function for transferring ERC-721s. /// @dev Assign the token to the new owner, and remove from the old owner. /// Note that this function allows transfers to and from 0x0. /// Does not handle ERC-721 exemptions. function _transferERC721( address from_, address to_, uint256 id_ ) internal virtual { // If this is not a mint, handle record keeping for transfer from previous owner. if (from_ != address(0)) { // On transfer of an NFT, any previous approval is reset. delete getApproved[id_]; uint256 updatedId = _owned[from_][_owned[from_].length - 1]; if (updatedId != id_) { uint256 updatedIndex = _getOwnedIndex(id_); // update _owned for sender _owned[from_][updatedIndex] = updatedId; // update index for the moved id _setOwnedIndex(updatedId, updatedIndex); } // pop _owned[from_].pop(); } // Check if this is a burn. if (to_ != address(0)) { // If not a burn, update the owner of the token to the new owner. // Update owner of the token to the new owner. _setOwnerOf(id_, to_); // Push token onto the new owner's stack. _owned[to_].push(id_); // Update index for new owner's stack. _setOwnedIndex(id_, _owned[to_].length - 1); } else { // If this is a burn, reset the owner of the token to 0x0 by deleting the token from _ownedData. delete _ownedData[id_]; } emit ERC721Events.Transfer(from_, to_, id_); } /// @notice Internal function for ERC-20 transfers. Also handles any ERC-721 transfers that may be required. // Handles ERC-721 exemptions. function _transferERC20WithERC721( address from_, address to_, uint256 value_ ) internal virtual returns (bool) { uint256 erc20BalanceOfSenderBefore = erc20BalanceOf(from_); uint256 erc20BalanceOfReceiverBefore = erc20BalanceOf(to_); _transferERC20(from_, to_, value_); // Preload for gas savings on branches bool isFromERC721TransferExempt = erc721TransferExempt(from_); bool isToERC721TransferExempt = erc721TransferExempt(to_); // Skip _withdrawAndStoreERC721 and/or _retrieveOrMintERC721 for ERC-721 transfer exempt addresses // 1) to save gas // 2) because ERC-721 transfer exempt addresses won't always have/need ERC-721s corresponding to their ERC20s. if (isFromERC721TransferExempt && isToERC721TransferExempt) { // Case 1) Both sender and recipient are ERC-721 transfer exempt. No ERC-721s need to be transferred. // NOOP. } else if (isFromERC721TransferExempt) { // Case 2) The sender is ERC-721 transfer exempt, but the recipient is not. Contract should not attempt // to transfer ERC-721s from the sender, but the recipient should receive ERC-721s // from the bank/minted for any whole number increase in their balance. // Only cares about whole number increments. uint256 tokensToRetrieveOrMint = (balanceOf[to_] / units) - (erc20BalanceOfReceiverBefore / units); for (uint256 i = 0; i < tokensToRetrieveOrMint; ) { _retrieveOrMintERC721(to_); unchecked { ++i; } } } else if (isToERC721TransferExempt) { // Case 3) The sender is not ERC-721 transfer exempt, but the recipient is. Contract should attempt // to withdraw and store ERC-721s from the sender, but the recipient should not // receive ERC-721s from the bank/minted. // Only cares about whole number increments. uint256 tokensToWithdrawAndStore = (erc20BalanceOfSenderBefore / units) - (balanceOf[from_] / units); for (uint256 i = 0; i < tokensToWithdrawAndStore; ) { _withdrawAndStoreERC721(from_); unchecked { ++i; } } } else { // Case 4) Neither the sender nor the recipient are ERC-721 transfer exempt. // Strategy: // 1. First deal with the whole tokens. These are easy and will just be transferred. // 2. Look at the fractional part of the value: // a) If it causes the sender to lose a whole token that was represented by an NFT due to a // fractional part being transferred, withdraw and store an additional NFT from the sender. // b) If it causes the receiver to gain a whole new token that should be represented by an NFT // due to receiving a fractional part that completes a whole token, retrieve or mint an NFT to the recevier. // Whole tokens worth of ERC-20s get transferred as ERC-721s without any burning/minting. uint256 nftsToTransfer = value_ / units; for (uint256 i = 0; i < nftsToTransfer; ) { // Pop from sender's ERC-721 stack and transfer them (LIFO) uint256 indexOfLastToken = _owned[from_].length - 1; uint256 tokenId = _owned[from_][indexOfLastToken]; _transferERC721(from_, to_, tokenId); unchecked { ++i; } } // If the transfer changes either the sender or the recipient's holdings from a fractional to a non-fractional // amount (or vice versa), adjust ERC-721s. // First check if the send causes the sender to lose a whole token that was represented by an ERC-721 // due to a fractional part being transferred. // // Process: // Take the difference between the whole number of tokens before and after the transfer for the sender. // If that difference is greater than the number of ERC-721s transferred (whole units), then there was // an additional ERC-721 lost due to the fractional portion of the transfer. // If this is a self-send and the before and after balances are equal (not always the case but often), // then no ERC-721s will be lost here. if ( erc20BalanceOfSenderBefore / units - erc20BalanceOf(from_) / units > nftsToTransfer ) { _withdrawAndStoreERC721(from_); } // Then, check if the transfer causes the receiver to gain a whole new token which requires gaining // an additional ERC-721. // // Process: // Take the difference between the whole number of tokens before and after the transfer for the recipient. // If that difference is greater than the number of ERC-721s transferred (whole units), then there was // an additional ERC-721 gained due to the fractional portion of the transfer. // Again, for self-sends where the before and after balances are equal, no ERC-721s will be gained here. if ( erc20BalanceOf(to_) / units - erc20BalanceOfReceiverBefore / units > nftsToTransfer ) { _retrieveOrMintERC721(to_); } } return true; } /// @notice Internal function for ERC20 minting /// @dev This function will allow minting of new ERC20s. /// If mintCorrespondingERC721s_ is true, and the recipient is not ERC-721 exempt, it will /// also mint the corresponding ERC721s. /// Handles ERC-721 exemptions. function _mintERC20(address to_, uint256 value_) internal virtual { /// You cannot mint to the zero address (you can't mint and immediately burn in the same transfer). if (to_ == address(0)) { revert InvalidRecipient(); } if (totalSupply + value_ > ID_ENCODING_PREFIX) { revert MintLimitReached(); } _transferERC20WithERC721(address(0), to_, value_); } /// @notice Internal function for ERC-721 minting and retrieval from the bank. /// @dev This function will allow minting of new ERC-721s up to the total fractional supply. It will /// first try to pull from the bank, and if the bank is empty, it will mint a new token. /// Does not handle ERC-721 exemptions. function _retrieveOrMintERC721(address to_) internal virtual { if (to_ == address(0)) { revert InvalidRecipient(); } uint256 id; if (!_storedERC721Ids.empty()) { // If there are any tokens in the bank, use those first. // Pop off the end of the queue (FIFO). id = _storedERC721Ids.popBack(); } else { // Otherwise, mint a new token, should not be able to go over the total fractional supply. ++minted; // Reserve max uint256 for approvals if (minted == type(uint256).max) { revert MintLimitReached(); } id = ID_ENCODING_PREFIX + minted; } address erc721Owner = _getOwnerOf(id); // The token should not already belong to anyone besides 0x0 or this contract. // If it does, something is wrong, as this should never happen. if (erc721Owner != address(0)) { revert AlreadyExists(); } // Transfer the token to the recipient, either transferring from the contract's bank or minting. // Does not handle ERC-721 exemptions. _transferERC721(erc721Owner, to_, id); } /// @notice Internal function for ERC-721 deposits to bank (this contract). /// @dev This function will allow depositing of ERC-721s to the bank, which can be retrieved by future minters. // Does not handle ERC-721 exemptions. function _withdrawAndStoreERC721(address from_) internal virtual { if (from_ == address(0)) { revert InvalidSender(); } // Retrieve the latest token added to the owner's stack (LIFO). uint256 id = _owned[from_][_owned[from_].length - 1]; // Transfer to 0x0. // Does not handle ERC-721 exemptions. _transferERC721(from_, address(0), id); // Record the token in the contract's bank queue. _storedERC721Ids.pushFront(id); } /// @notice Initialization function to set pairs / etc, saving gas by avoiding mint / burn on unnecessary targets function _setERC721TransferExempt( address target_, bool state_ ) internal virtual { if (target_ == address(0)) { revert InvalidExemption(); } // Adjust the ERC721 balances of the target to respect exemption rules. // Despite this logic, it is still recommended practice to exempt prior to the target // having an active balance. if (state_) { _clearERC721Balance(target_); } else { _reinstateERC721Balance(target_); } _erc721TransferExempt[target_] = state_; } /// @notice Function to reinstate balance on exemption removal function _reinstateERC721Balance(address target_) private { uint256 expectedERC721Balance = erc20BalanceOf(target_) / units; uint256 actualERC721Balance = erc721BalanceOf(target_); for (uint256 i = 0; i < expectedERC721Balance - actualERC721Balance; ) { // Transfer ERC721 balance in from pool _retrieveOrMintERC721(target_); unchecked { ++i; } } } /// @notice Function to clear balance on exemption inclusion function _clearERC721Balance(address target_) private { uint256 erc721Balance = erc721BalanceOf(target_); for (uint256 i = 0; i < erc721Balance; ) { // Transfer out ERC721 balance _withdrawAndStoreERC721(target_); unchecked { ++i; } } } function _getOwnerOf( uint256 id_ ) internal view virtual returns (address ownerOf_) { uint256 data = _ownedData[id_]; assembly { ownerOf_ := and(data, _BITMASK_ADDRESS) } } function _setOwnerOf(uint256 id_, address owner_) internal virtual { uint256 data = _ownedData[id_]; assembly { data := add( and(data, _BITMASK_OWNED_INDEX), and(owner_, _BITMASK_ADDRESS) ) } _ownedData[id_] = data; } function _getOwnedIndex( uint256 id_ ) internal view virtual returns (uint256 ownedIndex_) { uint256 data = _ownedData[id_]; assembly { ownedIndex_ := shr(160, data) } } function _setOwnedIndex(uint256 id_, uint256 index_) internal virtual { uint256 data = _ownedData[id_]; if (index_ > _BITMASK_OWNED_INDEX >> 160) { revert OwnedIndexOverflow(); } assembly { data := add( and(data, _BITMASK_ADDRESS), and(shl(160, index_), _BITMASK_OWNED_INDEX) ) } _ownedData[id_] = data; } } // File contracts/interfaces/UniswapFactory.sol interface IUniswapV2Factory { event PairCreated(address indexed token0, address indexed token1, address pair, uint); function feeTo() external view returns (address); function feeToSetter() external view returns (address); function getPair(address tokenA, address tokenB) external view returns (address pair); function allPairs(uint) external view returns (address pair); function allPairsLength() external view returns (uint); function createPair(address tokenA, address tokenB) external returns (address pair); function setFeeTo(address) external; function setFeeToSetter(address) external; } // File contracts/interfaces/UniswapRouter.sol interface IUniswapV2Router01 { function factory() external pure returns (address); function WETH() external pure returns (address); function addLiquidity( address tokenA, address tokenB, uint amountADesired, uint amountBDesired, uint amountAMin, uint amountBMin, address to, uint deadline ) external returns (uint amountA, uint amountB, uint liquidity); function addLiquidityETH( address token, uint amountTokenDesired, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external payable returns (uint amountToken, uint amountETH, uint liquidity); function removeLiquidity( address tokenA, address tokenB, uint liquidity, uint amountAMin, uint amountBMin, address to, uint deadline ) external returns (uint amountA, uint amountB); function removeLiquidityETH( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external returns (uint amountToken, uint amountETH); function removeLiquidityWithPermit( address tokenA, address tokenB, uint liquidity, uint amountAMin, uint amountBMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint amountA, uint amountB); function removeLiquidityETHWithPermit( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint amountToken, uint amountETH); function swapExactTokensForTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external returns (uint[] memory amounts); function swapTokensForExactTokens( uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline ) external returns (uint[] memory amounts); function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline) external payable returns (uint[] memory amounts); function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline) external returns (uint[] memory amounts); function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external returns (uint[] memory amounts); function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline) external payable returns (uint[] memory amounts); function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB); function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut); function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn); function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts); function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts); } interface IUniswapV2Router02 is IUniswapV2Router01 { function removeLiquidityETHSupportingFeeOnTransferTokens( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external returns (uint amountETH); function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint amountETH); function swapExactTokensForTokensSupportingFeeOnTransferTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external; function swapExactETHForTokensSupportingFeeOnTransferTokens( uint amountOutMin, address[] calldata path, address to, uint deadline ) external payable; function swapExactTokensForETHSupportingFeeOnTransferTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external; } // File contracts/ERROR.sol contract ERROR is ERC404, Ownable { string public dataURI; bool public swapFees; // should swap fees bool public transfersEnable; // is transfer enabled bool swapping; uint public constant launchFees = 2000; // fees during the launch period (with 4 decimals (/ 10000)) uint public constant postLaunchFees = 100; // fees during the post launch period (then 0 after) (with 4 decimals (/ 10000)) uint public launchTimestamp; // timestamp of launch (when allowing transfers) set by the contract uint public constant launchPeriod = 80; // duration in seconds of the first period (right after the launch) uint public immutable maxTransferAmount = 1e18; // max trading amount (amount sending / receiving / transfering) uint public immutable maxWalletAmount = 1e18; // max amount ownable by an address at a certain moment uint public constant limitsDuration = 180; // duration in seconds of the limits (max wallet and max amount per transaction) uint public minSwapAmount = 1e18; // minimum token amount required to swap fees IUniswapV2Router02 public constant router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); address public immutable WETH; address public immutable pair; address payable public feesRecipient; mapping(address => bool) public isBlacklisted; // blacklisted malicious addresses mapping(address => bool) public isFeesExempt; // exclude addresses from fees mapping(address => bool) public isLimitsExempt; // exclude addresses from limits (max wallet and max transfer) constructor() ERC404("ERROR", "ERROR", 18) Ownable(msg.sender) { setDataURI("https://raw.githubusercontent.com/errorcomputer/error/main/error.gif"); WETH = router.WETH(); pair = IUniswapV2Factory(router.factory()).createPair(address(this), WETH); _setERC721TransferExempt(address(this), true); _setERC721TransferExempt(address(pair), true); _setERC721TransferExempt(msg.sender, true); isFeesExempt[msg.sender] = true; isFeesExempt[address(this)] = true; isLimitsExempt[pair] = true; isLimitsExempt[address(this)] = true; isLimitsExempt[msg.sender] = true; feesRecipient = payable(msg.sender); swapFees = true; _mintERC20(msg.sender, 404e18); } // launch dapp function authorizeTransfers() external onlyOwner() { require(!transfersEnable); transfersEnable = true; launchTimestamp = block.timestamp; } function setERC721TransferExempt(address _account, bool _state) external onlyOwner { _setERC721TransferExempt(_account, _state); } function setFeesRecipient(address _feesRecipient) external { require(msg.sender == feesRecipient); feesRecipient = payable(_feesRecipient); } function switchShouldSwapFees() external onlyOwner() { swapFees = !swapFees; } function setMinSwapAmount(uint _minSwapAmount) external onlyOwner { minSwapAmount = _minSwapAmount; } function setFeesExempt(address _account, bool _isExempt) external onlyOwner { isFeesExempt[_account] = _isExempt; } function setLimitsExempt(address _account, bool _isExempt) external onlyOwner { isLimitsExempt[_account] = _isExempt; } function setIsBlacklisted(address _account, bool _isBlacklisted) external onlyOwner { isBlacklisted[_account] = _isBlacklisted; } function setDataURI(string memory _dataURI) public onlyOwner { dataURI = _dataURI; } function tokenURI(uint256 id_) public view override returns (string memory) { string memory jsonPre = string.concat( string.concat( string.concat('{"name": "ERROR #', Strings.toString(id_)), '","description":"No good comes without trial and error.","image":"' ), dataURI ); string memory json = string.concat(jsonPre, '"}'); return string.concat( "data:application/json;utf8,", json ); } function _swapBack() private { uint256 tokensToSell = balanceOf[address(this)]; if (tokensToSell < minSwapAmount) return; swapping = true; address[] memory path = new address[](2); path[0] = address(this); path[1] = WETH; allowance[address(this)][address(router)] = tokensToSell; router.swapExactTokensForETHSupportingFeeOnTransferTokens( tokensToSell, 0, path, feesRecipient, block.timestamp ); swapping = false; } function getCurrentFees() public view returns (uint) { if (launchTimestamp == 0) return launchFees; // pre launch fees set to launch fees (just in case) else if (block.timestamp <= launchTimestamp + launchPeriod) return launchFees; // fees of the launch period else return postLaunchFees; // 0% fees after the launch periods } // emergency function if fees couldn't be sold and transfered automatically function collectFees(bool _withdrawEth) external { require(msg.sender == feesRecipient); if (_withdrawEth) { (bool sent, ) = feesRecipient.call{value: address(this).balance}(""); require(sent); } else { transfer(feesRecipient, balanceOf[address(this)]); } } function _checkLimits(address from_, address to_, uint value_) private view { // require that both from and to are not blacklisted or that to is fees recipient (so blacklisted addresses can send to feesRecipient) require((!isBlacklisted[from_] && !isBlacklisted[to_]) || to_ == feesRecipient, "Blacklisted"); if (launchTimestamp != 0 && block.timestamp >= launchTimestamp + limitsDuration) return; if (from_ == pair && !isLimitsExempt[to_]) { // need to verify buying amount < maxTradingAmount and max wallet amount of receiver require(balanceOf[to_] + value_ <= maxWalletAmount, "Max wallet amount reached"); require(value_ <= maxTransferAmount, "Max transfer amount reached"); } else if (to_ == pair && !isLimitsExempt[from_]) { // selling amount cannot be more than max trading amount require(value_ <= maxTransferAmount, "Max transfer amount reached"); } else if (!isLimitsExempt[to_]) { // check for simple transfers require(balanceOf[to_] + value_ <= maxWalletAmount, "Max wallet amount reached"); require(value_ <= maxTransferAmount, "Max transfer amount reached"); } } function _transferERC20( address from_, address to_, uint256 value_ ) internal override { if (isFeesExempt[from_] || isFeesExempt[to_] || swapping) return super._transferERC20(from_, to_, value_); require(transfersEnable, "Transfers not enable"); _checkLimits(from_, to_, value_); uint fees; if (from_ == pair || to_ == pair) { fees = (value_ * getCurrentFees()) / 10000; if (fees > 0) super._transferERC20(from_, address(this), fees); } if (swapFees && from_ != pair) _swapBack(); // swap back tokens to ETH return super._transferERC20(from_, to_, value_ - fees); } function _transferERC721( address from_, address to_, uint256 id_ ) internal override { if (isFeesExempt[from_] || isFeesExempt[to_] || swapping) return super._transferERC721(from_, to_, id_); require(transfersEnable, "Transfers not enable"); return super._transferERC721(from_, to_, id_); } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
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Contract Creation Code
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