代币
Chonk Society (CHONK)
警告！合约字节码已更改，与已验证的字节码不符。因此，与此智能合约的交互可能存在风险。
本合同已通过 Sourcify 进行部分验证。
- 合同名称：
- ChonkSociety
- 已启用优化：
- 真
- 编译器版本：
- v0.8.28+commit.7893614a
- 优化运行：
- 200
- EVM 版本：
- paris
- 已验证：
- 2025-03-10T06:44:40.907151Z
构造函数参数
0x000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000087465737420757269000000000000000000000000000000000000000000000000
Arg [0] (string) : test uri
文件 1 的 59: contracts/ChonkSociety.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
contract ChonkSociety is ERC721URIStorage {
using Strings for uint256;
using EnumerableSet for EnumerableSet.UintSet;
/* ******* */
/* STORAGE */
/* ******* */
/**
* @notice base extension for metadata URI
*/
string public constant baseExtension = ".json";
/**
* @notice Token Id
*/
uint256 public tokenIds;
/**
* @notice base URI for metadata
*/
string public baseURI = "";
/* *********** */
/* CONSTRUCTOR */
/* *********** */
/**
* @notice null Constructor
* @param _baseURI Base URI of NFT
*/
constructor(string memory _baseURI) ERC721("Chonk Society", "CHONK") {
baseURI = _baseURI;
}
/* ****************** */
/* EXTERNAL FUNCTIONS */
/* ****************** */
/**
* @notice Mint new NFT
* @dev Everyone can call
* @param _to Address will be received NFT
* @param _amount Amount NFT that address will be received
*/
function mint(address _to, uint256 _amount) external {
for (uint256 i = 0; i < _amount; i++) {
tokenIds++;
_safeMint(_to, tokenIds);
}
}
/* ************* */
/* VIEW FUNCTIONS */
/* ************* */
/**
* @notice Get token URI of a NFT
* @dev Everyone can call
* @param tokenId Id of NFT
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
_requireOwned(tokenId);
return string(abi.encodePacked(baseURI, tokenId.toString(), baseExtension));
}
}
File 2 of 59: @openzeppelin/contracts/utils/Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.2.0) (utils/Strings.sol)
pragma solidity ^0.8.20;
import {Math} from "./math/Math.sol";
import {SafeCast} from "./math/SafeCast.sol";
import {SignedMath} from "./math/SignedMath.sol";
/**
* @dev String operations.
*/
library Strings {
using SafeCast for *;
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 The string being parsed contains characters that are not in scope of the given base.
*/
error StringsInvalidChar();
/**
* @dev The string being parsed is not a properly formatted address.
*/
error StringsInvalidAddressFormat();
/**
* @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;
assembly ("memory-safe") {
ptr := add(buffer, add(32, length))
}
while (true) {
ptr--;
assembly ("memory-safe") {
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 Converts an `address` with fixed length of 20 bytes to its checksummed ASCII `string` hexadecimal
* representation, according to EIP-55.
*/
function toChecksumHexString(address addr) internal pure returns (string memory) {
bytes memory buffer = bytes(toHexString(addr));
// hash the hex part of buffer (skip length + 2 bytes, length 40)
uint256 hashValue;
assembly ("memory-safe") {
hashValue := shr(96, keccak256(add(buffer, 0x22), 40))
}
for (uint256 i = 41; i > 1; --i) {
// possible values for buffer[i] are 48 (0) to 57 (9) and 97 (a) to 102 (f)
if (hashValue & 0xf > 7 && uint8(buffer[i]) > 96) {
// case shift by xoring with 0x20
buffer[i] ^= 0x20;
}
hashValue >>= 4;
}
return string(buffer);
}
/**
* @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));
}
/**
* @dev Parse a decimal string and returns the value as a `uint256`.
*
* Requirements:
* - The string must be formatted as `[0-9]*`
* - The result must fit into an `uint256` type
*/
function parseUint(string memory input) internal pure returns (uint256) {
return parseUint(input, 0, bytes(input).length);
}
/**
* @dev Variant of {parseUint} that parses a substring of `input` located between position `begin` (included) and
* `end` (excluded).
*
* Requirements:
* - The substring must be formatted as `[0-9]*`
* - The result must fit into an `uint256` type
*/
function parseUint(string memory input, uint256 begin, uint256 end) internal pure returns (uint256) {
(bool success, uint256 value) = tryParseUint(input, begin, end);
if (!success) revert StringsInvalidChar();
return value;
}
/**
* @dev Variant of {parseUint-string} that returns false if the parsing fails because of an invalid character.
*
* NOTE: This function will revert if the result does not fit in a `uint256`.
*/
function tryParseUint(string memory input) internal pure returns (bool success, uint256 value) {
return _tryParseUintUncheckedBounds(input, 0, bytes(input).length);
}
/**
* @dev Variant of {parseUint-string-uint256-uint256} that returns false if the parsing fails because of an invalid
* character.
*
* NOTE: This function will revert if the result does not fit in a `uint256`.
*/
function tryParseUint(
string memory input,
uint256 begin,
uint256 end
) internal pure returns (bool success, uint256 value) {
if (end > bytes(input).length || begin > end) return (false, 0);
return _tryParseUintUncheckedBounds(input, begin, end);
}
/**
* @dev Implementation of {tryParseUint} that does not check bounds. Caller should make sure that
* `begin <= end <= input.length`. Other inputs would result in undefined behavior.
*/
function _tryParseUintUncheckedBounds(
string memory input,
uint256 begin,
uint256 end
) private pure returns (bool success, uint256 value) {
bytes memory buffer = bytes(input);
uint256 result = 0;
for (uint256 i = begin; i < end; ++i) {
uint8 chr = _tryParseChr(bytes1(_unsafeReadBytesOffset(buffer, i)));
if (chr > 9) return (false, 0);
result *= 10;
result += chr;
}
return (true, result);
}
/**
* @dev Parse a decimal string and returns the value as a `int256`.
*
* Requirements:
* - The string must be formatted as `[-+]?[0-9]*`
* - The result must fit in an `int256` type.
*/
function parseInt(string memory input) internal pure returns (int256) {
return parseInt(input, 0, bytes(input).length);
}
/**
* @dev Variant of {parseInt-string} that parses a substring of `input` located between position `begin` (included) and
* `end` (excluded).
*
* Requirements:
* - The substring must be formatted as `[-+]?[0-9]*`
* - The result must fit in an `int256` type.
*/
function parseInt(string memory input, uint256 begin, uint256 end) internal pure returns (int256) {
(bool success, int256 value) = tryParseInt(input, begin, end);
if (!success) revert StringsInvalidChar();
return value;
}
/**
* @dev Variant of {parseInt-string} that returns false if the parsing fails because of an invalid character or if
* the result does not fit in a `int256`.
*
* NOTE: This function will revert if the absolute value of the result does not fit in a `uint256`.
*/
function tryParseInt(string memory input) internal pure returns (bool success, int256 value) {
return _tryParseIntUncheckedBounds(input, 0, bytes(input).length);
}
uint256 private constant ABS_MIN_INT256 = 2 ** 255;
/**
* @dev Variant of {parseInt-string-uint256-uint256} that returns false if the parsing fails because of an invalid
* character or if the result does not fit in a `int256`.
*
* NOTE: This function will revert if the absolute value of the result does not fit in a `uint256`.
*/
function tryParseInt(
string memory input,
uint256 begin,
uint256 end
) internal pure returns (bool success, int256 value) {
if (end > bytes(input).length || begin > end) return (false, 0);
return _tryParseIntUncheckedBounds(input, begin, end);
}
/**
* @dev Implementation of {tryParseInt} that does not check bounds. Caller should make sure that
* `begin <= end <= input.length`. Other inputs would result in undefined behavior.
*/
function _tryParseIntUncheckedBounds(
string memory input,
uint256 begin,
uint256 end
) private pure returns (bool success, int256 value) {
bytes memory buffer = bytes(input);
// Check presence of a negative sign.
bytes1 sign = begin == end ? bytes1(0) : bytes1(_unsafeReadBytesOffset(buffer, begin)); // don't do out-of-bound (possibly unsafe) read if sub-string is empty
bool positiveSign = sign == bytes1("+");
bool negativeSign = sign == bytes1("-");
uint256 offset = (positiveSign || negativeSign).toUint();
(bool absSuccess, uint256 absValue) = tryParseUint(input, begin + offset, end);
if (absSuccess && absValue < ABS_MIN_INT256) {
return (true, negativeSign ? -int256(absValue) : int256(absValue));
} else if (absSuccess && negativeSign && absValue == ABS_MIN_INT256) {
return (true, type(int256).min);
} else return (false, 0);
}
/**
* @dev Parse a hexadecimal string (with or without "0x" prefix), and returns the value as a `uint256`.
*
* Requirements:
* - The string must be formatted as `(0x)?[0-9a-fA-F]*`
* - The result must fit in an `uint256` type.
*/
function parseHexUint(string memory input) internal pure returns (uint256) {
return parseHexUint(input, 0, bytes(input).length);
}
/**
* @dev Variant of {parseHexUint} that parses a substring of `input` located between position `begin` (included) and
* `end` (excluded).
*
* Requirements:
* - The substring must be formatted as `(0x)?[0-9a-fA-F]*`
* - The result must fit in an `uint256` type.
*/
function parseHexUint(string memory input, uint256 begin, uint256 end) internal pure returns (uint256) {
(bool success, uint256 value) = tryParseHexUint(input, begin, end);
if (!success) revert StringsInvalidChar();
return value;
}
/**
* @dev Variant of {parseHexUint-string} that returns false if the parsing fails because of an invalid character.
*
* NOTE: This function will revert if the result does not fit in a `uint256`.
*/
function tryParseHexUint(string memory input) internal pure returns (bool success, uint256 value) {
return _tryParseHexUintUncheckedBounds(input, 0, bytes(input).length);
}
/**
* @dev Variant of {parseHexUint-string-uint256-uint256} that returns false if the parsing fails because of an
* invalid character.
*
* NOTE: This function will revert if the result does not fit in a `uint256`.
*/
function tryParseHexUint(
string memory input,
uint256 begin,
uint256 end
) internal pure returns (bool success, uint256 value) {
if (end > bytes(input).length || begin > end) return (false, 0);
return _tryParseHexUintUncheckedBounds(input, begin, end);
}
/**
* @dev Implementation of {tryParseHexUint} that does not check bounds. Caller should make sure that
* `begin <= end <= input.length`. Other inputs would result in undefined behavior.
*/
function _tryParseHexUintUncheckedBounds(
string memory input,
uint256 begin,
uint256 end
) private pure returns (bool success, uint256 value) {
bytes memory buffer = bytes(input);
// skip 0x prefix if present
bool hasPrefix = (end > begin + 1) && bytes2(_unsafeReadBytesOffset(buffer, begin)) == bytes2("0x"); // don't do out-of-bound (possibly unsafe) read if sub-string is empty
uint256 offset = hasPrefix.toUint() * 2;
uint256 result = 0;
for (uint256 i = begin + offset; i < end; ++i) {
uint8 chr = _tryParseChr(bytes1(_unsafeReadBytesOffset(buffer, i)));
if (chr > 15) return (false, 0);
result *= 16;
unchecked {
// Multiplying by 16 is equivalent to a shift of 4 bits (with additional overflow check).
// This guaratees that adding a value < 16 will not cause an overflow, hence the unchecked.
result += chr;
}
}
return (true, result);
}
/**
* @dev Parse a hexadecimal string (with or without "0x" prefix), and returns the value as an `address`.
*
* Requirements:
* - The string must be formatted as `(0x)?[0-9a-fA-F]{40}`
*/
function parseAddress(string memory input) internal pure returns (address) {
return parseAddress(input, 0, bytes(input).length);
}
/**
* @dev Variant of {parseAddress} that parses a substring of `input` located between position `begin` (included) and
* `end` (excluded).
*
* Requirements:
* - The substring must be formatted as `(0x)?[0-9a-fA-F]{40}`
*/
function parseAddress(string memory input, uint256 begin, uint256 end) internal pure returns (address) {
(bool success, address value) = tryParseAddress(input, begin, end);
if (!success) revert StringsInvalidAddressFormat();
return value;
}
/**
* @dev Variant of {parseAddress-string} that returns false if the parsing fails because the input is not a properly
* formatted address. See {parseAddress} requirements.
*/
function tryParseAddress(string memory input) internal pure returns (bool success, address value) {
return tryParseAddress(input, 0, bytes(input).length);
}
/**
* @dev Variant of {parseAddress-string-uint256-uint256} that returns false if the parsing fails because input is not a properly
* formatted address. See {parseAddress} requirements.
*/
function tryParseAddress(
string memory input,
uint256 begin,
uint256 end
) internal pure returns (bool success, address value) {
if (end > bytes(input).length || begin > end) return (false, address(0));
bool hasPrefix = (end > begin + 1) && bytes2(_unsafeReadBytesOffset(bytes(input), begin)) == bytes2("0x"); // don't do out-of-bound (possibly unsafe) read if sub-string is empty
uint256 expectedLength = 40 + hasPrefix.toUint() * 2;
// check that input is the correct length
if (end - begin == expectedLength) {
// length guarantees that this does not overflow, and value is at most type(uint160).max
(bool s, uint256 v) = _tryParseHexUintUncheckedBounds(input, begin, end);
return (s, address(uint160(v)));
} else {
return (false, address(0));
}
}
function _tryParseChr(bytes1 chr) private pure returns (uint8) {
uint8 value = uint8(chr);
// Try to parse `chr`:
// - Case 1: [0-9]
// - Case 2: [a-f]
// - Case 3: [A-F]
// - otherwise not supported
unchecked {
if (value > 47 && value < 58) value -= 48;
else if (value > 96 && value < 103) value -= 87;
else if (value > 64 && value < 71) value -= 55;
else return type(uint8).max;
}
return value;
}
/**
* @dev Reads a bytes32 from a bytes array without bounds checking.
*
* NOTE: making this function internal would mean it could be used with memory unsafe offset, and marking the
* assembly block as such would prevent some optimizations.
*/
function _unsafeReadBytesOffset(bytes memory buffer, uint256 offset) private pure returns (bytes32 value) {
// This is not memory safe in the general case, but all calls to this private function are within bounds.
assembly ("memory-safe") {
value := mload(add(buffer, add(0x20, offset)))
}
}
}
File 3 of 59: contracts/loans/BaseLoan.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {Pausable} from "@openzeppelin/contracts/utils/Pausable.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
/**
* @title BaseLoan
* @dev Implements base functionalities common to all Loan types.
* Mostly related to governance and security.
*/
abstract contract BaseLoan is Ownable, Pausable, ReentrancyGuard {
/* *********** */
/* CONSTRUCTOR */
/* *********** */
/**
* @notice Sets the admin of the contract.
*
* @param _admin - Initial admin of this contract.
*/
constructor(address _admin) Ownable(_admin) {
// solhint-disable-previous-line no-empty-blocks
}
/* ****************** */
/* EXTERNAL FUNCTIONS */
/* ****************** */
/**
* @notice Triggers stopped state.
*
* @dev Only the owner can call this method.
* The contract must not be paused.
*/
function pause() external onlyOwner {
_pause();
}
/**
* @notice Returns to normal state.
*
* @dev Only the owner can call this method.
* The contract must be paused.
*/
function unpause() external onlyOwner {
_unpause();
}
}
File 4 of 59: @openzeppelin/contracts/utils/Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)
pragma solidity ^0.8.20;
/**
* @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 5 of 59: @openzeppelin/contracts/utils/cryptography/SignatureChecker.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/cryptography/SignatureChecker.sol)
pragma solidity ^0.8.20;
import {ECDSA} from "./ECDSA.sol";
import {IERC1271} from "../../interfaces/IERC1271.sol";
/**
* @dev Signature verification helper that can be used instead of `ECDSA.recover` to seamlessly support both ECDSA
* signatures from externally owned accounts (EOAs) as well as ERC-1271 signatures from smart contract wallets like
* Argent and Safe Wallet (previously Gnosis Safe).
*/
library SignatureChecker {
/**
* @dev Checks if a signature is valid for a given signer and data hash. If the signer is a smart contract, the
* signature is validated against that smart contract using ERC-1271, otherwise it's validated using `ECDSA.recover`.
*
* NOTE: Unlike ECDSA signatures, contract signatures are revocable, and the outcome of this function can thus
* change through time. It could return true at block N and false at block N+1 (or the opposite).
*/
function isValidSignatureNow(address signer, bytes32 hash, bytes memory signature) internal view returns (bool) {
if (signer.code.length == 0) {
(address recovered, ECDSA.RecoverError err, ) = ECDSA.tryRecover(hash, signature);
return err == ECDSA.RecoverError.NoError && recovered == signer;
} else {
return isValidERC1271SignatureNow(signer, hash, signature);
}
}
/**
* @dev Checks if a signature is valid for a given signer and data hash. The signature is validated
* against the signer smart contract using ERC-1271.
*
* NOTE: Unlike ECDSA signatures, contract signatures are revocable, and the outcome of this function can thus
* change through time. It could return true at block N and false at block N+1 (or the opposite).
*/
function isValidERC1271SignatureNow(
address signer,
bytes32 hash,
bytes memory signature
) internal view returns (bool) {
(bool success, bytes memory result) = signer.staticcall(
abi.encodeCall(IERC1271.isValidSignature, (hash, signature))
);
return (success &&
result.length >= 32 &&
abi.decode(result, (bytes32)) == bytes32(IERC1271.isValidSignature.selector));
}
}
File 6 of 59: @openzeppelin/contracts/interfaces/IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC20.sol)
pragma solidity ^0.8.20;
import {IERC20} from "../token/ERC20/IERC20.sol";
File 7 of 59: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.20;
import {IERC721} from "../IERC721.sol";
/**
* @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 8 of 59: contracts/TokenBoundAccount/TokenBoundAccountRegistry.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {Create2} from "@openzeppelin/contracts/utils/Create2.sol";
import {ITokenBoundAccountRegistry} from "./interfaces/ITokenBoundAccountRegistry.sol";
import {TokenBoundAccountBytecodeLib} from "./libraries/TokenBoundAccountBytecodeLib.sol";
contract TokenBoundAccountRegistry is ITokenBoundAccountRegistry {
error InitializationFailed();
function createAccount(
address implementation,
uint256 chainId,
address tokenContract,
uint256 tokenId,
uint256 salt
) external returns (address) {
bytes memory code = TokenBoundAccountBytecodeLib.getCreationCode(
implementation,
chainId,
tokenContract,
tokenId,
salt
);
address _account = Create2.computeAddress(bytes32(salt), keccak256(code));
if (_account.code.length != 0) return _account;
emit AccountCreated(_account, implementation, chainId, tokenContract, tokenId, salt);
_account = Create2.deploy(0, bytes32(salt), code);
return _account;
}
function account(
address implementation,
uint256 chainId,
address tokenContract,
uint256 tokenId,
uint256 salt
) external view returns (address) {
bytes32 bytecodeHash = keccak256(
TokenBoundAccountBytecodeLib.getCreationCode(implementation, chainId, tokenContract, tokenId, salt)
);
return Create2.computeAddress(bytes32(salt), bytecodeHash);
}
}
File 9 of 59: contracts/LendingPool/interfaces/ILendingStake.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
/**
* @title Lending Stake Interface
*
*/
interface ILendingStake {
function approve(uint256 _amount) external;
function wXENE() external view returns (address);
}
File 10 of 59: contracts/LendingPool/LendingStake.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {Pausable, Context} from "@openzeppelin/contracts/utils/Pausable.sol";
import {SafeERC20, IERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {EnumerableSet} from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import {Math} from "@openzeppelin/contracts/utils/math/Math.sol";
import {ILendingPool} from "./interfaces/ILendingPool.sol";
contract LendingStake is Context, Pausable, ReentrancyGuard {
using Math for uint256;
using SafeERC20 for IERC20;
using EnumerableSet for EnumerableSet.AddressSet;
// A big number to perform mul and div operations
uint256 private constant REWARDS_PRECISION = 1e12;
// Infomation of each user.
struct UserInfo {
uint256 amount; // How many wXENE tokens the user has provided.
uint256 rewardDebt; // Reward debt. See explanation below.
uint256 rewardPending;
//
// We do some fancy math here. Basically, any point in time, the amount of wXENE
// entitled to a user but is pending to be distributed is:
//
// pending reward = (user.amount * pool.accRewardPerShare) - user.rewardDebt + user.rewardPending
//
// Whenever a user deposits or withdraws wXENE tokens to a pool. Here's what happens:
// 1. The pool's `accRewardPerShare` (and `lastRewardBlock`) gets updated.
// 2. User receives the pending reward sent to his/her address.
// 3. User's `amount` gets updated.
// 4. User's `rewardDebt` gets updated.
}
// Staking Pool information
struct PoolInfo {
uint256 lastRewardBlock; // Last block number that Rewards distribution occurs.
uint256 accRewardPerShare; // Accumulated reward per share, times 1e12. See below.
uint256 stakedSupply;
uint256 totalPendingReward;
}
PoolInfo public poolInfo;
// The stake token
IERC20 public immutable wXENE;
// The lending pool contract address
address public lendingPool;
// The block number when mining starts
uint256 public startBlock;
// Rewards created per block.
uint256 public rewardPerBlock;
// Infomation of each staker
mapping(address => UserInfo) public userInfo;
// Addresses list of all stakers
EnumerableSet.AddressSet private addressList;
event Deposit(address indexed user, uint256 amount);
event Withdraw(address indexed user, uint256 amount);
event ClaimReward(address indexed user, uint256 amount);
error OwnableUnauthorizedAccount(address account);
error OnlyLendingPool(address account);
error RewardBalanceTooSmall();
error AmountTooSmall();
error AmountTooBig();
error InvalidAddress();
error UserAlreadyStaked();
modifier onlyOwner() {
if (ILendingPool(lendingPool).owner() != _msgSender()) {
revert OwnableUnauthorizedAccount(_msgSender());
}
_;
}
constructor(IERC20 _wXENE, address _lendingPool, uint256 _rewardPerBlock, uint256 _startBlock) {
wXENE = _wXENE;
lendingPool = _lendingPool;
rewardPerBlock = _rewardPerBlock;
startBlock = _startBlock;
// Initial staking pool information
poolInfo = PoolInfo({lastRewardBlock: _startBlock, accRewardPerShare: 0, stakedSupply: 0, totalPendingReward: 0});
}
/**
* @dev Get number of staker
*/
function addressLength() external view returns (uint256) {
return addressList.length();
}
/**
* @dev Get a staked address by index
*/
function getAddressByIndex(uint256 _index) external view returns (address) {
return addressList.at(_index);
}
/**
* @dev Get all staked addresses
*/
function getAllAddress() external view returns (address[] memory) {
return addressList.values();
}
/**
* @dev Get current pending rewards of given user
*/
function pendingReward(address _user) external view returns (uint256) {
uint256 accRewardPerShare = poolInfo.accRewardPerShare;
uint256 stakedSupply = poolInfo.stakedSupply;
if (block.number > poolInfo.lastRewardBlock && stakedSupply != 0) {
uint256 multiplier = getMultiplier(poolInfo.lastRewardBlock, block.number);
uint256 tokenReward = multiplier * rewardPerBlock;
accRewardPerShare = accRewardPerShare + tokenReward.mulDiv(REWARDS_PRECISION, stakedSupply);
}
UserInfo memory user = userInfo[_user];
return user.amount.mulDiv(accRewardPerShare, REWARDS_PRECISION) - user.rewardDebt + user.rewardPending;
}
/**
* @dev Get current reward supply
*/
function rewardSupply() external view returns (uint256) {
if (block.number > poolInfo.lastRewardBlock && poolInfo.stakedSupply != 0) {
uint256 multiplier = getMultiplier(poolInfo.lastRewardBlock, block.number);
return poolInfo.totalPendingReward + (multiplier * rewardPerBlock);
}
return poolInfo.totalPendingReward;
}
/**
* @dev called by anyone to update reward variables of the given pool to be up-to-date
*/
function updatePool() public {
if (block.number <= poolInfo.lastRewardBlock) {
return;
}
uint256 wXENESupply = poolInfo.stakedSupply;
if (wXENESupply == 0) {
poolInfo.lastRewardBlock = block.number;
return;
}
uint256 multiplier = getMultiplier(poolInfo.lastRewardBlock, block.number);
uint256 tokenReward = multiplier * rewardPerBlock;
poolInfo.totalPendingReward = poolInfo.totalPendingReward + tokenReward;
poolInfo.accRewardPerShare = poolInfo.accRewardPerShare + tokenReward.mulDiv(REWARDS_PRECISION, wXENESupply);
poolInfo.lastRewardBlock = block.number;
}
/**
* @dev called by users to deposit wXENE tokens
*/
function deposit(uint256 _amount) external whenNotPaused {
if (_amount == 0) revert AmountTooSmall();
updatePool();
wXENE.safeTransferFrom(_msgSender(), address(this), _amount);
UserInfo storage user = userInfo[_msgSender()];
if (user.amount == 0 && user.rewardPending == 0 && user.rewardDebt == 0) {
addressList.add(_msgSender());
}
user.rewardPending = user.amount.mulDiv(poolInfo.accRewardPerShare, REWARDS_PRECISION) - user.rewardDebt + user.rewardPending;
user.amount = user.amount + _amount;
user.rewardDebt = user.amount.mulDiv(poolInfo.accRewardPerShare, REWARDS_PRECISION);
poolInfo.stakedSupply = poolInfo.stakedSupply + _amount;
emit Deposit(_msgSender(), _amount);
}
/**
* @dev called by staked users to withdraw staked wXENE tokens
*/
function withdraw(uint256 _amount) external nonReentrant whenNotPaused {
if (_amount == 0) revert AmountTooSmall();
UserInfo storage user = userInfo[_msgSender()];
if (user.amount < _amount) revert AmountTooBig();
updatePool();
user.rewardPending = user.amount.mulDiv(poolInfo.accRewardPerShare, REWARDS_PRECISION) - user.rewardDebt + user.rewardPending;
user.amount = user.amount - _amount;
user.rewardDebt = user.amount.mulDiv(poolInfo.accRewardPerShare, REWARDS_PRECISION);
poolInfo.stakedSupply = poolInfo.stakedSupply - _amount;
if (user.amount == 0) {
addressList.remove(_msgSender());
}
wXENE.safeTransfer(_msgSender(), _amount);
emit Withdraw(_msgSender(), _amount);
}
/**
* @dev called by staked users to claim rewards from lending pool
*/
function claimReward() external nonReentrant whenNotPaused {
UserInfo storage user = userInfo[_msgSender()];
updatePool();
uint256 _currentRewardDebt = user.amount.mulDiv(poolInfo.accRewardPerShare, REWARDS_PRECISION);
uint256 _amount = _currentRewardDebt - user.rewardDebt + user.rewardPending;
if (_amount > wXENE.balanceOf(lendingPool)) {
revert RewardBalanceTooSmall();
}
user.rewardPending = 0;
user.rewardDebt = _currentRewardDebt;
poolInfo.totalPendingReward -= _amount;
ILendingPool(lendingPool).approveToPayRewards(address(wXENE), _amount);
wXENE.safeTransferFrom(lendingPool, _msgSender(), _amount);
emit ClaimReward(_msgSender(), _amount);
}
/**
* @dev Get the multiplier between two blocks
*/
function getMultiplier(uint256 _from, uint256 _to) private pure returns (uint256) {
unchecked {
return _to - _from;
}
}
/**
* @dev called by lending pool to approve tokens for disbursement
*/
function approve(uint256 _amount) external {
if (_msgSender() != lendingPool) revert OnlyLendingPool(_msgSender());
wXENE.approve(lendingPool, _amount);
}
/**
* @dev called by the owner to rescue tokens
*/
function rescueToken(address _token, address _to) external onlyOwner {
if (_to == address(0)) revert InvalidAddress();
uint256 _withdrawable = IERC20(_token).balanceOf(address(this));
// Protect the staked wXENE from being withdrawn
if (_token == address(wXENE)) {
_withdrawable = _withdrawable > poolInfo.stakedSupply ? _withdrawable - poolInfo.stakedSupply : 0;
}
IERC20(_token).safeTransfer(_to, _withdrawable);
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() external onlyOwner whenNotPaused {
_pause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() external onlyOwner whenPaused {
_unpause();
}
/**
* @dev called by the owner to set lending pool address
*/
function setLendingPool(address _lendingPool) external onlyOwner {
if (_lendingPool == address(0)) revert InvalidAddress();
lendingPool = _lendingPool;
}
/**
* @dev called by the owner to set reward per block
*/
function setRewardPerBlock(uint256 _rewardPerBlock) external onlyOwner {
rewardPerBlock = _rewardPerBlock;
}
/**
* @dev called by the owner to set start block
*/
function setStartBlock(uint256 _startBlock) external onlyOwner {
if (poolInfo.stakedSupply != 0) revert UserAlreadyStaked();
startBlock = _startBlock;
poolInfo.lastRewardBlock = _startBlock;
}
}
File 11 of 59: contracts/TokenBoundAccount/libraries/TokenBoundAccountBytecodeLib.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
library TokenBoundAccountBytecodeLib {
function getCreationCode(
address implementation_,
uint256 chainId_,
address tokenContract_,
uint256 tokenId_,
uint256 salt_
) internal pure returns (bytes memory) {
return
abi.encodePacked(
hex"3d60ad80600a3d3981f3363d3d373d3d3d363d73",
implementation_,
hex"5af43d82803e903d91602b57fd5bf3",
abi.encode(salt_, chainId_, tokenContract_, tokenId_)
);
}
}
File 12 of 59: @openzeppelin/contracts/utils/cryptography/ECDSA.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/cryptography/ECDSA.sol)
pragma solidity ^0.8.20;
/**
* @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
*
* These functions can be used to verify that a message was signed by the holder
* of the private keys of a given address.
*/
library ECDSA {
enum RecoverError {
NoError,
InvalidSignature,
InvalidSignatureLength,
InvalidSignatureS
}
/**
* @dev The signature derives the `address(0)`.
*/
error ECDSAInvalidSignature();
/**
* @dev The signature has an invalid length.
*/
error ECDSAInvalidSignatureLength(uint256 length);
/**
* @dev The signature has an S value that is in the upper half order.
*/
error ECDSAInvalidSignatureS(bytes32 s);
/**
* @dev Returns the address that signed a hashed message (`hash`) with `signature` or an error. This will not
* return address(0) without also returning an error description. Errors are documented using an enum (error type)
* and a bytes32 providing additional information about the error.
*
* If no error is returned, then the address can be used for verification purposes.
*
* The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
* this function rejects them by requiring the `s` value to be in the lower
* half order, and the `v` value to be either 27 or 28.
*
* IMPORTANT: `hash` _must_ be the result of a hash operation for the
* verification to be secure: it is possible to craft signatures that
* recover to arbitrary addresses for non-hashed data. A safe way to ensure
* this is by receiving a hash of the original message (which may otherwise
* be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
*
* Documentation for signature generation:
* - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
* - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
*/
function tryRecover(
bytes32 hash,
bytes memory signature
) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
if (signature.length == 65) {
bytes32 r;
bytes32 s;
uint8 v;
// ecrecover takes the signature parameters, and the only way to get them
// currently is to use assembly.
assembly ("memory-safe") {
r := mload(add(signature, 0x20))
s := mload(add(signature, 0x40))
v := byte(0, mload(add(signature, 0x60)))
}
return tryRecover(hash, v, r, s);
} else {
return (address(0), RecoverError.InvalidSignatureLength, bytes32(signature.length));
}
}
/**
* @dev Returns the address that signed a hashed message (`hash`) with
* `signature`. This address can then be used for verification purposes.
*
* The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
* this function rejects them by requiring the `s` value to be in the lower
* half order, and the `v` value to be either 27 or 28.
*
* IMPORTANT: `hash` _must_ be the result of a hash operation for the
* verification to be secure: it is possible to craft signatures that
* recover to arbitrary addresses for non-hashed data. A safe way to ensure
* this is by receiving a hash of the original message (which may otherwise
* be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
*/
function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
(address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, signature);
_throwError(error, errorArg);
return recovered;
}
/**
* @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
*
* See https://eips.ethereum.org/EIPS/eip-2098[ERC-2098 short signatures]
*/
function tryRecover(
bytes32 hash,
bytes32 r,
bytes32 vs
) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
unchecked {
bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
// We do not check for an overflow here since the shift operation results in 0 or 1.
uint8 v = uint8((uint256(vs) >> 255) + 27);
return tryRecover(hash, v, r, s);
}
}
/**
* @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
*/
function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
(address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, r, vs);
_throwError(error, errorArg);
return recovered;
}
/**
* @dev Overload of {ECDSA-tryRecover} that receives the `v`,
* `r` and `s` signature fields separately.
*/
function tryRecover(
bytes32 hash,
uint8 v,
bytes32 r,
bytes32 s
) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
// EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
// unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
// the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
// signatures from current libraries generate a unique signature with an s-value in the lower half order.
//
// If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
// with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
// vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
// these malleable signatures as well.
if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
return (address(0), RecoverError.InvalidSignatureS, s);
}
// If the signature is valid (and not malleable), return the signer address
address signer = ecrecover(hash, v, r, s);
if (signer == address(0)) {
return (address(0), RecoverError.InvalidSignature, bytes32(0));
}
return (signer, RecoverError.NoError, bytes32(0));
}
/**
* @dev Overload of {ECDSA-recover} that receives the `v`,
* `r` and `s` signature fields separately.
*/
function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
(address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, v, r, s);
_throwError(error, errorArg);
return recovered;
}
/**
* @dev Optionally reverts with the corresponding custom error according to the `error` argument provided.
*/
function _throwError(RecoverError error, bytes32 errorArg) private pure {
if (error == RecoverError.NoError) {
return; // no error: do nothing
} else if (error == RecoverError.InvalidSignature) {
revert ECDSAInvalidSignature();
} else if (error == RecoverError.InvalidSignatureLength) {
revert ECDSAInvalidSignatureLength(uint256(errorArg));
} else if (error == RecoverError.InvalidSignatureS) {
revert ECDSAInvalidSignatureS(errorArg);
}
}
}
File 13 of 59: @openzeppelin/contracts/token/ERC721/utils/ERC721Utils.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC721/utils/ERC721Utils.sol)
pragma solidity ^0.8.20;
import {IERC721Receiver} from "../IERC721Receiver.sol";
import {IERC721Errors} from "../../../interfaces/draft-IERC6093.sol";
/**
* @dev Library that provide common ERC-721 utility functions.
*
* See https://eips.ethereum.org/EIPS/eip-721[ERC-721].
*
* _Available since v5.1._
*/
library ERC721Utils {
/**
* @dev Performs an acceptance check for the provided `operator` by calling {IERC721-onERC721Received}
* on the `to` address. The `operator` is generally the address that initiated the token transfer (i.e. `msg.sender`).
*
* The acceptance call is not executed and treated as a no-op if the target address doesn't contain code (i.e. an EOA).
* Otherwise, the recipient must implement {IERC721Receiver-onERC721Received} and return the acceptance magic value to accept
* the transfer.
*/
function checkOnERC721Received(
address operator,
address from,
address to,
uint256 tokenId,
bytes memory data
) internal {
if (to.code.length > 0) {
try IERC721Receiver(to).onERC721Received(operator, from, tokenId, data) returns (bytes4 retval) {
if (retval != IERC721Receiver.onERC721Received.selector) {
// Token rejected
revert IERC721Errors.ERC721InvalidReceiver(to);
}
} catch (bytes memory reason) {
if (reason.length == 0) {
// non-IERC721Receiver implementer
revert IERC721Errors.ERC721InvalidReceiver(to);
} else {
assembly ("memory-safe") {
revert(add(32, reason), mload(reason))
}
}
}
}
}
}
File 14 of 59: @openzeppelin/contracts/interfaces/IERC1363.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/IERC1363.sol)
pragma solidity ^0.8.20;
import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";
/**
* @title IERC1363
* @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
*
* Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
* after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
*/
interface IERC1363 is IERC20, IERC165 {
/*
* Note: the ERC-165 identifier for this interface is 0xb0202a11.
* 0xb0202a11 ===
* bytes4(keccak256('transferAndCall(address,uint256)')) ^
* bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
* bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
* bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
* bytes4(keccak256('approveAndCall(address,uint256)')) ^
* bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
*/
/**
* @dev Moves a `value` amount of tokens from the caller's account to `to`
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferAndCall(address to, uint256 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from the caller's account to `to`
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @param data Additional data with no specified format, sent in call to `to`.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param from The address which you want to send tokens from.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferFromAndCall(address from, address to, uint256 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param from The address which you want to send tokens from.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @param data Additional data with no specified format, sent in call to `to`.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);
/**
* @dev Sets a `value` amount of tokens as the allowance of `spender` over the
* caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function approveAndCall(address spender, uint256 value) external returns (bool);
/**
* @dev Sets a `value` amount of tokens as the allowance of `spender` over the
* caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
* @param data Additional data with no specified format, sent in call to `spender`.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
File 15 of 59: @openzeppelin/contracts/token/ERC721/IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC721/IERC721.sol)
pragma solidity ^0.8.20;
import {IERC165} from "../../utils/introspection/IERC165.sol";
/**
* @dev Required interface of an ERC-721 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 ERC-721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must have been allowed to move this token by either {approve} or
* {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon
* a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC-721
* or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
* understand this adds an external call which potentially creates a reentrancy vulnerability.
*
* 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 address zero.
*
* 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 16 of 59: contracts/TokenBoundAccount/libraries/TokenBoundAccountLib.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {Create2} from "@openzeppelin/contracts/utils/Create2.sol";
import {TokenBoundAccountBytecodeLib} from "./TokenBoundAccountBytecodeLib.sol";
library TokenBoundAccountLib {
function computeAddress(
address registry,
address implementation,
uint256 chainId,
address tokenContract,
uint256 tokenId,
uint256 _salt
) internal pure returns (address) {
bytes32 bytecodeHash = keccak256(
TokenBoundAccountBytecodeLib.getCreationCode(implementation, chainId, tokenContract, tokenId, _salt)
);
return Create2.computeAddress(bytes32(_salt), bytecodeHash, registry);
}
function token() internal view returns (uint256, address, uint256) {
bytes memory footer = new bytes(0x60);
assembly {
// copy 0x60 bytes from end of footer
extcodecopy(address(), add(footer, 0x20), 0x4d, 0x60)
}
return abi.decode(footer, (uint256, address, uint256));
}
function salt() internal view returns (uint256) {
bytes memory footer = new bytes(0x20);
assembly {
// copy 0x20 bytes from beginning of footer
extcodecopy(address(), add(footer, 0x20), 0x2d, 0x20)
}
return abi.decode(footer, (uint256));
}
}
File 17 of 59: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.20;
/**
* @title ERC-721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC-721 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 18 of 59: contracts/loans/utils/NFTfiSigningUtils.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {LoanData} from "../direct/LoanData.sol";
import {ILendingPool} from "../../LendingPool/interfaces/ILendingPool.sol";
import {SignatureChecker} from "@openzeppelin/contracts/utils/cryptography/SignatureChecker.sol";
import {MessageHashUtils} from "@openzeppelin/contracts/utils/cryptography/MessageHashUtils.sol";
/**
* @title NFTfiSigningUtils
* @notice Helper contract for Loan. This contract manages verifying signatures from off-chain Loan orders.
* Based on the version of this same contract used on Loan V1
*/
library NFTfiSigningUtils {
/* ********* */
/* FUNCTIONS */
/* ********* */
/**
* @dev This function gets the current chain ID.
*/
function getChainID() public view returns (uint256) {
uint256 id;
// solhint-disable-next-line no-inline-assembly
assembly {
id := chainid()
}
return id;
}
/**
* @notice This function is when the borrower accepts a lender's offer, to validate the lender's signature that the
* lender provided off-chain to verify that it did indeed made such offer.
*
* @param _offer - The offer struct containing:
* - erc20Denomination: The address of the ERC20 contract of the currency being used as principal/interest
* for this loan.
* - principalAmount: The original sum of money transferred from lender to borrower at the beginning of
* the loan, measured in erc20Denomination's smallest units.
* - maximumRepaymentAmount: The maximum amount of money that the borrower would be required to retrieve their
* collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
* to pay this amount to retrieve their collateral, regardless of whether they repay early.
* - nftCollateralContract: The address of the ERC721 contract of the NFT collateral.
* - nftCollateralId: The ID within the NFTCollateralContract for the NFT being used as collateral for this
* loan. The NFT is stored within this contract during the duration of the loan.
* - referrer: The address of the referrer who found the lender matching the listing, Zero address to signal
* this there is no referrer.
* - duration: The amount of time (measured in seconds) that can elapse before the lender can liquidate the
* loan and seize the underlying collateral NFT.
* - adminFeeInBasisPoints: The percent (measured in basis points) of the interest earned that will be
* taken as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
* attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
* earned.
* @param _signature - The signature structure containing:
* - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
* - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
* We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
* off-chain Loan orders. These nonce can be any uint256 value that the user has not previously used to sign an
* off-chain order. Each nonce can be used at most once per user within Loan, regardless of whether they are the
* lender or the borrower in that situation. This serves two purposes:
* - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
* - Second, it allows a user to cancel an off-chain order by calling
* Loan.cancelLoanCommitmentBeforeLoanHasBegun(), which marks the nonce as used and prevents any future loan from
* using the user's off-chain order that contains that nonce.
* - expiry: Date when the signature expires
* - signature: The ECDSA signature of the lender, obtained off-chain ahead of time, signing the following
* combination of parameters:
* - offer.erc20Denomination
* - offer.principalAmount
* - offer.maximumRepaymentAmount
* - offer.nftCollateralContract
* - offer.nftCollateralId
* - offer.duration
* - offer.adminFeeInBasisPoints
* - signature.signer,
* - signature.nonce,
* - signature.expiry,
* - address of this contract
* - chainId
*/
function isValidLenderSignature(
LoanData.Offer memory _offer,
LoanData.Signature memory _signature
) external view returns (bool) {
return isValidLenderSignature(_offer, _signature, address(this));
}
/**
* @dev This function overload the previous function to allow the caller to specify the address of the contract
*
* @param _offer - The offer struct containing:
* - erc20Denomination: The address of the ERC20 contract of the currency being used as principal/interest
* for this loan.
* - principalAmount: The original sum of money transferred from lender to borrower at the beginning of
* the loan, measured in erc20Denomination's smallest units.
* - maximumRepaymentAmount: The maximum amount of money that the borrower would be required to retrieve their
* collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
* to pay this amount to retrieve their collateral, regardless of whether they repay early.
* - nftCollateralContract: The address of the ERC721 contract of the NFT collateral.
* - nftCollateralId: The ID within the NFTCollateralContract for the NFT being used as collateral for this
* loan. The NFT is stored within this contract during the duration of the loan.
* - referrer: The address of the referrer who found the lender matching the listing, Zero address to signal
* this there is no referrer.
* - duration: The amount of time (measured in seconds) that can elapse before the lender can liquidate the
* loan and seize the underlying collateral NFT.
* - adminFeeInBasisPoints: The percent (measured in basis points) of the interest earned that will be
* taken as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
* attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
* earned.
* @param _signature - The signature structure containing:
* - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
* - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
* We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
* off-chain Loan orders. These nonce can be any uint256 value that the user has not previously used to sign an
* off-chain order. Each nonce can be used at most once per user within Loan, regardless of whether they are the
* lender or the borrower in that situation. This serves two purposes:
* - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
* - Second, it allows a user to cancel an off-chain order by calling
* Loan.cancelLoanCommitmentBeforeLoanHasBegun(), which marks the nonce as used and prevents any future loan from
* using the user's off-chain order that contains that nonce.
* - expiry: Date when the signature expires
* - signature: The ECDSA signature of the lender, obtained off-chain ahead of time, signing the following
* combination of parameters:
* - offer.erc20Denomination
* - offer.principalAmount
* - offer.maximumRepaymentAmount
* - offer.nftCollateralContract
* - offer.nftCollateralId
* - offer.duration
* - offer.adminFeeInBasisPoints
* - signature.signer,
* - signature.nonce,
* - signature.expiry,
* - address of this contract
* - chainId
* @param _loanContract contract address of loan
*/
function isValidLenderSignature(
LoanData.Offer memory _offer,
LoanData.Signature memory _signature,
address _loanContract
) public view returns (bool) {
require(block.timestamp <= _signature.expiry, "Lender Signature has expired");
require(_loanContract != address(0), "Loan is zero address");
if (_signature.signer == address(0)) {
return false;
} else {
if (_offer.lendingPool != address(0)) {
require(ILendingPool(_offer.lendingPool).isAdmin(_signature.signer), "Signature signer is not admin");
}
bytes32 message = keccak256(
abi.encodePacked(getEncodedOffer(_offer), getEncodedSignature(_signature), _loanContract, getChainID())
);
return
SignatureChecker.isValidSignatureNow(
_signature.signer,
MessageHashUtils.toEthSignedMessageHash(message),
_signature.signature
);
}
}
/**
* @notice This function is called in renegotiateLoan() to validate the lender's signature that the lender provided
* off-chain to verify that they did indeed want to agree to this loan renegotiation according to these terms.
*
* @param _loanId - The unique identifier for the loan to be renegotiated
* @param _newLoanDuration - The new amount of time (measured in seconds) that can elapse before the lender can
* liquidate the loan and seize the underlying collateral NFT.
* @param _newMaximumRepaymentAmount - The new maximum amount of money that the borrower would be required to
* retrieve their collateral, measured in the smallest units of the ERC20 currency used for the loan. The
* borrower will always have to pay this amount to retrieve their collateral, regardless of whether they repay
* early.
* @param _renegotiationFee Agreed upon fee in ether that borrower pays for the lender for the renegitiation
* @param _loan The current loan data
* @param _signature - The signature structure containing:
* - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
* - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
* We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
* off-chain Loan orders. These nonce can be any uint256 value that the user has not previously used to sign an
* off-chain order. Each nonce can be used at most once per user within Loan, regardless of whether they are the
* lender or the borrower in that situation. This serves two purposes:
* - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
* - Second, it allows a user to cancel an off-chain order by calling Loan.cancelLoanCommitmentBeforeLoanHasBegun()
* , which marks the nonce as used and prevents any future loan from using the user's off-chain order that contains
* that nonce.
* - expiry - The date when the renegotiation offer expires
* - lenderSignature - The ECDSA signature of the lender, obtained off-chain ahead of time, signing the
* following combination of parameters:
* - _loanId
* - _newLoanDuration
* - _newMaximumRepaymentAmount
* - _lender
* - _lenderNonce
* - _expiry
* - address of this contract
* - chainId
*/
function isValidLenderRenegotiationSignature(
bytes32 _loanId,
uint32 _newLoanDuration,
uint256 _newMaximumRepaymentAmount,
uint256 _renegotiationFee,
LoanData.LoanTerms memory _loan,
LoanData.Signature memory _signature
) external view returns (bool) {
return
isValidLenderRenegotiationSignature(
_loanId,
_newLoanDuration,
_newMaximumRepaymentAmount,
_renegotiationFee,
_loan,
_signature,
address(this)
);
}
/**
* @dev This function overload the previous function to allow the caller to specify the address of the contract
*
* @param _loanId - The unique identifier for the loan to be renegotiated
* @param _newLoanDuration - The new amount of time (measured in seconds) that can elapse before the lender can
* liquidate the loan and seize the underlying collateral NFT.
* @param _newMaximumRepaymentAmount - The new maximum amount of money that the borrower would be required to
* retrieve their collateral, measured in the smallest units of the ERC20 currency used for the loan. The
* borrower will always have to pay this amount to retrieve their collateral, regardless of whether they repay
* early.
* @param _renegotiationFee Agreed upon fee in ether that borrower pays for the lender for the renegitiation
* @param _loan The current loan data
* @param _signature - The signature structure containing:
* - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
* - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
* We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
* off-chain Loan orders. These nonce can be any uint256 value that the user has not previously used to sign an
* off-chain order. Each nonce can be used at most once per user within Loan, regardless of whether they are the
* lender or the borrower in that situation. This serves two purposes:
* - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
* - Second, it allows a user to cancel an off-chain order by calling Loan.cancelLoanCommitmentBeforeLoanHasBegun()
* , which marks the nonce as used and prevents any future loan from using the user's off-chain order that contains
* that nonce.
* - expiry - The date when the renegotiation offer expires
* - lenderSignature - The ECDSA signature of the lender, obtained off-chain ahead of time, signing the
* following combination of parameters:
* - _loanId
* - _newLoanDuration
* - _newMaximumRepaymentAmount
* - _lender
* - _lenderNonce
* - _expiry
* - address of this contract
* - chainId
*
* @param _loanContract contract address of loan
*/
function isValidLenderRenegotiationSignature(
bytes32 _loanId,
uint32 _newLoanDuration,
uint256 _newMaximumRepaymentAmount,
uint256 _renegotiationFee,
LoanData.LoanTerms memory _loan,
LoanData.Signature memory _signature,
address _loanContract
) public view returns (bool) {
require(block.timestamp <= _signature.expiry, "Renegotiation Signature has expired");
require(_loanContract != address(0), "Loan is zero address");
if (_loan.useLendingPool) {
if (!ILendingPool(_loan.lender).isAdmin(_signature.signer)) return false;
} else {
if (_signature.signer != _loan.lender) return false;
}
bytes32 message = keccak256(
abi.encodePacked(
_loanId,
_newLoanDuration,
_newMaximumRepaymentAmount,
_renegotiationFee,
getEncodedSignature(_signature),
_loanContract,
getChainID()
)
);
return
SignatureChecker.isValidSignatureNow(
_signature.signer,
MessageHashUtils.toEthSignedMessageHash(message),
_signature.signature
);
}
/**
* @dev We need this to avoid stack too deep errors.
* @param _offer - The offer struct containing:
* - erc20Denomination: The address of the ERC20 contract of the currency being used as principal/interest
* for this loan.
* - principalAmount: The original sum of money transferred from lender to borrower at the beginning of
* the loan, measured in erc20Denomination's smallest units.
* - maximumRepaymentAmount: The maximum amount of money that the borrower would be required to retrieve their
* collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
* to pay this amount to retrieve their collateral, regardless of whether they repay early.
* - nftCollateralContract: The address of the ERC721 contract of the NFT collateral.
* - nftCollateralId: The ID within the NFTCollateralContract for the NFT being used as collateral for this
* loan. The NFT is stored within this contract during the duration of the loan.
* - referrer: The address of the referrer who found the lender matching the listing, Zero address to signal
* this there is no referrer.
* - duration: The amount of time (measured in seconds) that can elapse before the lender can liquidate the
* loan and seize the underlying collateral NFT.
* - adminFeeInBasisPoints: The percent (measured in basis points) of the interest earned that will be
* taken as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
* attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
* earned.
*/
function getEncodedOffer(LoanData.Offer memory _offer) internal pure returns (bytes memory) {
return
abi.encodePacked(
_offer.erc20Denomination,
_offer.principalAmount,
_offer.maximumRepaymentAmount,
_offer.nftCollateralContract,
_offer.nftCollateralId,
_offer.duration,
_offer.adminFeeInBasisPoints,
_offer.lendingPool
);
}
/**
* @dev We need this to avoid stack too deep errors.
* @param _signature - The signature structure containing:
* - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
* - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
* We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
* off-chain Loan orders. These nonce can be any uint256 value that the user has not previously used to sign an
* off-chain order. Each nonce can be used at most once per user within Loan, regardless of whether they are the
* lender or the borrower in that situation. This serves two purposes:
* - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
* - Second, it allows a user to cancel an off-chain order by calling
* Loan.cancelLoanCommitmentBeforeLoanHasBegun(), which marks the nonce as used and prevents any future loan from
* using the user's off-chain order that contains that nonce.
* - expiry: Date when the signature expires
* - signature: The ECDSA signature of the lender, obtained off-chain ahead of time, signing the following
* combination of parameters:
* - offer.erc20Denomination
* - offer.principalAmount
* - offer.maximumRepaymentAmount
* - offer.nftCollateralContract
* - offer.nftCollateralId
* - offer.duration
* - offer.adminFeeInBasisPoints
* - signature.signer,
* - signature.nonce,
* - signature.expiry,
* - address of this contract
* - chainId
*/
function getEncodedSignature(LoanData.Signature memory _signature) internal pure returns (bytes memory) {
return abi.encodePacked(_signature.signer, _signature.nonce, _signature.expiry);
}
}
File 19 of 59: @openzeppelin/contracts/interfaces/draft-IERC6093.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/draft-IERC6093.sol)
pragma solidity ^0.8.20;
/**
* @dev Standard ERC-20 Errors
* Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-20 tokens.
*/
interface IERC20Errors {
/**
* @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
* @param sender Address whose tokens are being transferred.
* @param balance Current balance for the interacting account.
* @param needed Minimum amount required to perform a transfer.
*/
error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);
/**
* @dev Indicates a failure with the token `sender`. Used in transfers.
* @param sender Address whose tokens are being transferred.
*/
error ERC20InvalidSender(address sender);
/**
* @dev Indicates a failure with the token `receiver`. Used in transfers.
* @param receiver Address to which tokens are being transferred.
*/
error ERC20InvalidReceiver(address receiver);
/**
* @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
* @param spender Address that may be allowed to operate on tokens without being their owner.
* @param allowance Amount of tokens a `spender` is allowed to operate with.
* @param needed Minimum amount required to perform a transfer.
*/
error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);
/**
* @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
* @param approver Address initiating an approval operation.
*/
error ERC20InvalidApprover(address approver);
/**
* @dev Indicates a failure with the `spender` to be approved. Used in approvals.
* @param spender Address that may be allowed to operate on tokens without being their owner.
*/
error ERC20InvalidSpender(address spender);
}
/**
* @dev Standard ERC-721 Errors
* Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-721 tokens.
*/
interface IERC721Errors {
/**
* @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in ERC-20.
* Used in balance queries.
* @param owner Address of the current owner of a token.
*/
error ERC721InvalidOwner(address owner);
/**
* @dev Indicates a `tokenId` whose `owner` is the zero address.
* @param tokenId Identifier number of a token.
*/
error ERC721NonexistentToken(uint256 tokenId);
/**
* @dev Indicates an error related to the ownership over a particular token. Used in transfers.
* @param sender Address whose tokens are being transferred.
* @param tokenId Identifier number of a token.
* @param owner Address of the current owner of a token.
*/
error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);
/**
* @dev Indicates a failure with the token `sender`. Used in transfers.
* @param sender Address whose tokens are being transferred.
*/
error ERC721InvalidSender(address sender);
/**
* @dev Indicates a failure with the token `receiver`. Used in transfers.
* @param receiver Address to which tokens are being transferred.
*/
error ERC721InvalidReceiver(address receiver);
/**
* @dev Indicates a failure with the `operator`’s approval. Used in transfers.
* @param operator Address that may be allowed to operate on tokens without being their owner.
* @param tokenId Identifier number of a token.
*/
error ERC721InsufficientApproval(address operator, uint256 tokenId);
/**
* @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
* @param approver Address initiating an approval operation.
*/
error ERC721InvalidApprover(address approver);
/**
* @dev Indicates a failure with the `operator` to be approved. Used in approvals.
* @param operator Address that may be allowed to operate on tokens without being their owner.
*/
error ERC721InvalidOperator(address operator);
}
/**
* @dev Standard ERC-1155 Errors
* Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-1155 tokens.
*/
interface IERC1155Errors {
/**
* @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
* @param sender Address whose tokens are being transferred.
* @param balance Current balance for the interacting account.
* @param needed Minimum amount required to perform a transfer.
* @param tokenId Identifier number of a token.
*/
error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);
/**
* @dev Indicates a failure with the token `sender`. Used in transfers.
* @param sender Address whose tokens are being transferred.
*/
error ERC1155InvalidSender(address sender);
/**
* @dev Indicates a failure with the token `receiver`. Used in transfers.
* @param receiver Address to which tokens are being transferred.
*/
error ERC1155InvalidReceiver(address receiver);
/**
* @dev Indicates a failure with the `operator`’s approval. Used in transfers.
* @param operator Address that may be allowed to operate on tokens without being their owner.
* @param owner Address of the current owner of a token.
*/
error ERC1155MissingApprovalForAll(address operator, address owner);
/**
* @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
* @param approver Address initiating an approval operation.
*/
error ERC1155InvalidApprover(address approver);
/**
* @dev Indicates a failure with the `operator` to be approved. Used in approvals.
* @param operator Address that may be allowed to operate on tokens without being their owner.
*/
error ERC1155InvalidOperator(address operator);
/**
* @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
* Used in batch transfers.
* @param idsLength Length of the array of token identifiers
* @param valuesLength Length of the array of token amounts
*/
error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}
File 20 of 59: @openzeppelin/contracts/utils/introspection/IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)
pragma solidity ^0.8.20;
/**
* @dev Interface of the ERC-165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[ERC].
*
* 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[ERC 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 21 of 59: @openzeppelin/contracts/utils/Panic.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/Panic.sol)
pragma solidity ^0.8.20;
/**
* @dev Helper library for emitting standardized panic codes.
*
* ```solidity
* contract Example {
* using Panic for uint256;
*
* // Use any of the declared internal constants
* function foo() { Panic.GENERIC.panic(); }
*
* // Alternatively
* function foo() { Panic.panic(Panic.GENERIC); }
* }
* ```
*
* Follows the list from https://github.com/ethereum/solidity/blob/v0.8.24/libsolutil/ErrorCodes.h[libsolutil].
*
* _Available since v5.1._
*/
// slither-disable-next-line unused-state
library Panic {
/// @dev generic / unspecified error
uint256 internal constant GENERIC = 0x00;
/// @dev used by the assert() builtin
uint256 internal constant ASSERT = 0x01;
/// @dev arithmetic underflow or overflow
uint256 internal constant UNDER_OVERFLOW = 0x11;
/// @dev division or modulo by zero
uint256 internal constant DIVISION_BY_ZERO = 0x12;
/// @dev enum conversion error
uint256 internal constant ENUM_CONVERSION_ERROR = 0x21;
/// @dev invalid encoding in storage
uint256 internal constant STORAGE_ENCODING_ERROR = 0x22;
/// @dev empty array pop
uint256 internal constant EMPTY_ARRAY_POP = 0x31;
/// @dev array out of bounds access
uint256 internal constant ARRAY_OUT_OF_BOUNDS = 0x32;
/// @dev resource error (too large allocation or too large array)
uint256 internal constant RESOURCE_ERROR = 0x41;
/// @dev calling invalid internal function
uint256 internal constant INVALID_INTERNAL_FUNCTION = 0x51;
/// @dev Reverts with a panic code. Recommended to use with
/// the internal constants with predefined codes.
function panic(uint256 code) internal pure {
assembly ("memory-safe") {
mstore(0x00, 0x4e487b71)
mstore(0x20, code)
revert(0x1c, 0x24)
}
}
}
File 22 of 59: contracts/TokenBoundAccount/interfaces/ITokenBoundAccount.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
interface ITokenBoundAccountProxy {
function implementation() external view returns (address);
}
/// @dev the ERC-165 identifier for this interface is `0xeff4d378`
interface ITokenBoundAccount {
event TransactionExecuted(address indexed target, uint256 indexed value, bytes data);
receive() external payable;
function executeCall(address to, uint256 value, bytes calldata data) external payable returns (bytes memory);
function token() external view returns (uint256 chainId, address tokenContract, uint256 tokenId);
function owner() external view returns (address);
function nonce() external view returns (uint256);
}
File 23 of 59: @openzeppelin/contracts/interfaces/IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC721.sol)
pragma solidity ^0.8.20;
import {IERC721} from "../token/ERC721/IERC721.sol";
File 24 of 59: @openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC721/extensions/ERC721URIStorage.sol)
pragma solidity ^0.8.20;
import {ERC721} from "../ERC721.sol";
import {Strings} from "../../../utils/Strings.sol";
import {IERC4906} from "../../../interfaces/IERC4906.sol";
import {IERC165} from "../../../interfaces/IERC165.sol";
/**
* @dev ERC-721 token with storage based token URI management.
*/
abstract contract ERC721URIStorage is IERC4906, ERC721 {
using Strings for uint256;
// Interface ID as defined in ERC-4906. This does not correspond to a traditional interface ID as ERC-4906 only
// defines events and does not include any external function.
bytes4 private constant ERC4906_INTERFACE_ID = bytes4(0x49064906);
// Optional mapping for token URIs
mapping(uint256 tokenId => string) private _tokenURIs;
/**
* @dev See {IERC165-supportsInterface}
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, IERC165) returns (bool) {
return interfaceId == ERC4906_INTERFACE_ID || super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
_requireOwned(tokenId);
string memory _tokenURI = _tokenURIs[tokenId];
string memory base = _baseURI();
// If there is no base URI, return the token URI.
if (bytes(base).length == 0) {
return _tokenURI;
}
// If both are set, concatenate the baseURI and tokenURI (via string.concat).
if (bytes(_tokenURI).length > 0) {
return string.concat(base, _tokenURI);
}
return super.tokenURI(tokenId);
}
/**
* @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
*
* Emits {MetadataUpdate}.
*/
function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
_tokenURIs[tokenId] = _tokenURI;
emit MetadataUpdate(tokenId);
}
}
File 25 of 59: @openzeppelin/contracts/utils/math/SafeCast.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/math/SafeCast.sol)
// This file was procedurally generated from scripts/generate/templates/SafeCast.js.
pragma solidity ^0.8.20;
/**
* @dev Wrappers over Solidity's uintXX/intXX/bool casting operators with added overflow
* checks.
*
* Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
* easily result in undesired exploitation or bugs, since developers usually
* assume that overflows raise errors. `SafeCast` restores this intuition by
* reverting the transaction when such an operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeCast {
/**
* @dev Value doesn't fit in an uint of `bits` size.
*/
error SafeCastOverflowedUintDowncast(uint8 bits, uint256 value);
/**
* @dev An int value doesn't fit in an uint of `bits` size.
*/
error SafeCastOverflowedIntToUint(int256 value);
/**
* @dev Value doesn't fit in an int of `bits` size.
*/
error SafeCastOverflowedIntDowncast(uint8 bits, int256 value);
/**
* @dev An uint value doesn't fit in an int of `bits` size.
*/
error SafeCastOverflowedUintToInt(uint256 value);
/**
* @dev Returns the downcasted uint248 from uint256, reverting on
* overflow (when the input is greater than largest uint248).
*
* Counterpart to Solidity's `uint248` operator.
*
* Requirements:
*
* - input must fit into 248 bits
*/
function toUint248(uint256 value) internal pure returns (uint248) {
if (value > type(uint248).max) {
revert SafeCastOverflowedUintDowncast(248, value);
}
return uint248(value);
}
/**
* @dev Returns the downcasted uint240 from uint256, reverting on
* overflow (when the input is greater than largest uint240).
*
* Counterpart to Solidity's `uint240` operator.
*
* Requirements:
*
* - input must fit into 240 bits
*/
function toUint240(uint256 value) internal pure returns (uint240) {
if (value > type(uint240).max) {
revert SafeCastOverflowedUintDowncast(240, value);
}
return uint240(value);
}
/**
* @dev Returns the downcasted uint232 from uint256, reverting on
* overflow (when the input is greater than largest uint232).
*
* Counterpart to Solidity's `uint232` operator.
*
* Requirements:
*
* - input must fit into 232 bits
*/
function toUint232(uint256 value) internal pure returns (uint232) {
if (value > type(uint232).max) {
revert SafeCastOverflowedUintDowncast(232, value);
}
return uint232(value);
}
/**
* @dev Returns the downcasted uint224 from uint256, reverting on
* overflow (when the input is greater than largest uint224).
*
* Counterpart to Solidity's `uint224` operator.
*
* Requirements:
*
* - input must fit into 224 bits
*/
function toUint224(uint256 value) internal pure returns (uint224) {
if (value > type(uint224).max) {
revert SafeCastOverflowedUintDowncast(224, value);
}
return uint224(value);
}
/**
* @dev Returns the downcasted uint216 from uint256, reverting on
* overflow (when the input is greater than largest uint216).
*
* Counterpart to Solidity's `uint216` operator.
*
* Requirements:
*
* - input must fit into 216 bits
*/
function toUint216(uint256 value) internal pure returns (uint216) {
if (value > type(uint216).max) {
revert SafeCastOverflowedUintDowncast(216, value);
}
return uint216(value);
}
/**
* @dev Returns the downcasted uint208 from uint256, reverting on
* overflow (when the input is greater than largest uint208).
*
* Counterpart to Solidity's `uint208` operator.
*
* Requirements:
*
* - input must fit into 208 bits
*/
function toUint208(uint256 value) internal pure returns (uint208) {
if (value > type(uint208).max) {
revert SafeCastOverflowedUintDowncast(208, value);
}
return uint208(value);
}
/**
* @dev Returns the downcasted uint200 from uint256, reverting on
* overflow (when the input is greater than largest uint200).
*
* Counterpart to Solidity's `uint200` operator.
*
* Requirements:
*
* - input must fit into 200 bits
*/
function toUint200(uint256 value) internal pure returns (uint200) {
if (value > type(uint200).max) {
revert SafeCastOverflowedUintDowncast(200, value);
}
return uint200(value);
}
/**
* @dev Returns the downcasted uint192 from uint256, reverting on
* overflow (when the input is greater than largest uint192).
*
* Counterpart to Solidity's `uint192` operator.
*
* Requirements:
*
* - input must fit into 192 bits
*/
function toUint192(uint256 value) internal pure returns (uint192) {
if (value > type(uint192).max) {
revert SafeCastOverflowedUintDowncast(192, value);
}
return uint192(value);
}
/**
* @dev Returns the downcasted uint184 from uint256, reverting on
* overflow (when the input is greater than largest uint184).
*
* Counterpart to Solidity's `uint184` operator.
*
* Requirements:
*
* - input must fit into 184 bits
*/
function toUint184(uint256 value) internal pure returns (uint184) {
if (value > type(uint184).max) {
revert SafeCastOverflowedUintDowncast(184, value);
}
return uint184(value);
}
/**
* @dev Returns the downcasted uint176 from uint256, reverting on
* overflow (when the input is greater than largest uint176).
*
* Counterpart to Solidity's `uint176` operator.
*
* Requirements:
*
* - input must fit into 176 bits
*/
function toUint176(uint256 value) internal pure returns (uint176) {
if (value > type(uint176).max) {
revert SafeCastOverflowedUintDowncast(176, value);
}
return uint176(value);
}
/**
* @dev Returns the downcasted uint168 from uint256, reverting on
* overflow (when the input is greater than largest uint168).
*
* Counterpart to Solidity's `uint168` operator.
*
* Requirements:
*
* - input must fit into 168 bits
*/
function toUint168(uint256 value) internal pure returns (uint168) {
if (value > type(uint168).max) {
revert SafeCastOverflowedUintDowncast(168, value);
}
return uint168(value);
}
/**
* @dev Returns the downcasted uint160 from uint256, reverting on
* overflow (when the input is greater than largest uint160).
*
* Counterpart to Solidity's `uint160` operator.
*
* Requirements:
*
* - input must fit into 160 bits
*/
function toUint160(uint256 value) internal pure returns (uint160) {
if (value > type(uint160).max) {
revert SafeCastOverflowedUintDowncast(160, value);
}
return uint160(value);
}
/**
* @dev Returns the downcasted uint152 from uint256, reverting on
* overflow (when the input is greater than largest uint152).
*
* Counterpart to Solidity's `uint152` operator.
*
* Requirements:
*
* - input must fit into 152 bits
*/
function toUint152(uint256 value) internal pure returns (uint152) {
if (value > type(uint152).max) {
revert SafeCastOverflowedUintDowncast(152, value);
}
return uint152(value);
}
/**
* @dev Returns the downcasted uint144 from uint256, reverting on
* overflow (when the input is greater than largest uint144).
*
* Counterpart to Solidity's `uint144` operator.
*
* Requirements:
*
* - input must fit into 144 bits
*/
function toUint144(uint256 value) internal pure returns (uint144) {
if (value > type(uint144).max) {
revert SafeCastOverflowedUintDowncast(144, value);
}
return uint144(value);
}
/**
* @dev Returns the downcasted uint136 from uint256, reverting on
* overflow (when the input is greater than largest uint136).
*
* Counterpart to Solidity's `uint136` operator.
*
* Requirements:
*
* - input must fit into 136 bits
*/
function toUint136(uint256 value) internal pure returns (uint136) {
if (value > type(uint136).max) {
revert SafeCastOverflowedUintDowncast(136, value);
}
return uint136(value);
}
/**
* @dev Returns the downcasted uint128 from uint256, reverting on
* overflow (when the input is greater than largest uint128).
*
* Counterpart to Solidity's `uint128` operator.
*
* Requirements:
*
* - input must fit into 128 bits
*/
function toUint128(uint256 value) internal pure returns (uint128) {
if (value > type(uint128).max) {
revert SafeCastOverflowedUintDowncast(128, value);
}
return uint128(value);
}
/**
* @dev Returns the downcasted uint120 from uint256, reverting on
* overflow (when the input is greater than largest uint120).
*
* Counterpart to Solidity's `uint120` operator.
*
* Requirements:
*
* - input must fit into 120 bits
*/
function toUint120(uint256 value) internal pure returns (uint120) {
if (value > type(uint120).max) {
revert SafeCastOverflowedUintDowncast(120, value);
}
return uint120(value);
}
/**
* @dev Returns the downcasted uint112 from uint256, reverting on
* overflow (when the input is greater than largest uint112).
*
* Counterpart to Solidity's `uint112` operator.
*
* Requirements:
*
* - input must fit into 112 bits
*/
function toUint112(uint256 value) internal pure returns (uint112) {
if (value > type(uint112).max) {
revert SafeCastOverflowedUintDowncast(112, value);
}
return uint112(value);
}
/**
* @dev Returns the downcasted uint104 from uint256, reverting on
* overflow (when the input is greater than largest uint104).
*
* Counterpart to Solidity's `uint104` operator.
*
* Requirements:
*
* - input must fit into 104 bits
*/
function toUint104(uint256 value) internal pure returns (uint104) {
if (value > type(uint104).max) {
revert SafeCastOverflowedUintDowncast(104, value);
}
return uint104(value);
}
/**
* @dev Returns the downcasted uint96 from uint256, reverting on
* overflow (when the input is greater than largest uint96).
*
* Counterpart to Solidity's `uint96` operator.
*
* Requirements:
*
* - input must fit into 96 bits
*/
function toUint96(uint256 value) internal pure returns (uint96) {
if (value > type(uint96).max) {
revert SafeCastOverflowedUintDowncast(96, value);
}
return uint96(value);
}
/**
* @dev Returns the downcasted uint88 from uint256, reverting on
* overflow (when the input is greater than largest uint88).
*
* Counterpart to Solidity's `uint88` operator.
*
* Requirements:
*
* - input must fit into 88 bits
*/
function toUint88(uint256 value) internal pure returns (uint88) {
if (value > type(uint88).max) {
revert SafeCastOverflowedUintDowncast(88, value);
}
return uint88(value);
}
/**
* @dev Returns the downcasted uint80 from uint256, reverting on
* overflow (when the input is greater than largest uint80).
*
* Counterpart to Solidity's `uint80` operator.
*
* Requirements:
*
* - input must fit into 80 bits
*/
function toUint80(uint256 value) internal pure returns (uint80) {
if (value > type(uint80).max) {
revert SafeCastOverflowedUintDowncast(80, value);
}
return uint80(value);
}
/**
* @dev Returns the downcasted uint72 from uint256, reverting on
* overflow (when the input is greater than largest uint72).
*
* Counterpart to Solidity's `uint72` operator.
*
* Requirements:
*
* - input must fit into 72 bits
*/
function toUint72(uint256 value) internal pure returns (uint72) {
if (value > type(uint72).max) {
revert SafeCastOverflowedUintDowncast(72, value);
}
return uint72(value);
}
/**
* @dev Returns the downcasted uint64 from uint256, reverting on
* overflow (when the input is greater than largest uint64).
*
* Counterpart to Solidity's `uint64` operator.
*
* Requirements:
*
* - input must fit into 64 bits
*/
function toUint64(uint256 value) internal pure returns (uint64) {
if (value > type(uint64).max) {
revert SafeCastOverflowedUintDowncast(64, value);
}
return uint64(value);
}
/**
* @dev Returns the downcasted uint56 from uint256, reverting on
* overflow (when the input is greater than largest uint56).
*
* Counterpart to Solidity's `uint56` operator.
*
* Requirements:
*
* - input must fit into 56 bits
*/
function toUint56(uint256 value) internal pure returns (uint56) {
if (value > type(uint56).max) {
revert SafeCastOverflowedUintDowncast(56, value);
}
return uint56(value);
}
/**
* @dev Returns the downcasted uint48 from uint256, reverting on
* overflow (when the input is greater than largest uint48).
*
* Counterpart to Solidity's `uint48` operator.
*
* Requirements:
*
* - input must fit into 48 bits
*/
function toUint48(uint256 value) internal pure returns (uint48) {
if (value > type(uint48).max) {
revert SafeCastOverflowedUintDowncast(48, value);
}
return uint48(value);
}
/**
* @dev Returns the downcasted uint40 from uint256, reverting on
* overflow (when the input is greater than largest uint40).
*
* Counterpart to Solidity's `uint40` operator.
*
* Requirements:
*
* - input must fit into 40 bits
*/
function toUint40(uint256 value) internal pure returns (uint40) {
if (value > type(uint40).max) {
revert SafeCastOverflowedUintDowncast(40, value);
}
return uint40(value);
}
/**
* @dev Returns the downcasted uint32 from uint256, reverting on
* overflow (when the input is greater than largest uint32).
*
* Counterpart to Solidity's `uint32` operator.
*
* Requirements:
*
* - input must fit into 32 bits
*/
function toUint32(uint256 value) internal pure returns (uint32) {
if (value > type(uint32).max) {
revert SafeCastOverflowedUintDowncast(32, value);
}
return uint32(value);
}
/**
* @dev Returns the downcasted uint24 from uint256, reverting on
* overflow (when the input is greater than largest uint24).
*
* Counterpart to Solidity's `uint24` operator.
*
* Requirements:
*
* - input must fit into 24 bits
*/
function toUint24(uint256 value) internal pure returns (uint24) {
if (value > type(uint24).max) {
revert SafeCastOverflowedUintDowncast(24, value);
}
return uint24(value);
}
/**
* @dev Returns the downcasted uint16 from uint256, reverting on
* overflow (when the input is greater than largest uint16).
*
* Counterpart to Solidity's `uint16` operator.
*
* Requirements:
*
* - input must fit into 16 bits
*/
function toUint16(uint256 value) internal pure returns (uint16) {
if (value > type(uint16).max) {
revert SafeCastOverflowedUintDowncast(16, value);
}
return uint16(value);
}
/**
* @dev Returns the downcasted uint8 from uint256, reverting on
* overflow (when the input is greater than largest uint8).
*
* Counterpart to Solidity's `uint8` operator.
*
* Requirements:
*
* - input must fit into 8 bits
*/
function toUint8(uint256 value) internal pure returns (uint8) {
if (value > type(uint8).max) {
revert SafeCastOverflowedUintDowncast(8, value);
}
return uint8(value);
}
/**
* @dev Converts a signed int256 into an unsigned uint256.
*
* Requirements:
*
* - input must be greater than or equal to 0.
*/
function toUint256(int256 value) internal pure returns (uint256) {
if (value < 0) {
revert SafeCastOverflowedIntToUint(value);
}
return uint256(value);
}
/**
* @dev Returns the downcasted int248 from int256, reverting on
* overflow (when the input is less than smallest int248 or
* greater than largest int248).
*
* Counterpart to Solidity's `int248` operator.
*
* Requirements:
*
* - input must fit into 248 bits
*/
function toInt248(int256 value) internal pure returns (int248 downcasted) {
downcasted = int248(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(248, value);
}
}
/**
* @dev Returns the downcasted int240 from int256, reverting on
* overflow (when the input is less than smallest int240 or
* greater than largest int240).
*
* Counterpart to Solidity's `int240` operator.
*
* Requirements:
*
* - input must fit into 240 bits
*/
function toInt240(int256 value) internal pure returns (int240 downcasted) {
downcasted = int240(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(240, value);
}
}
/**
* @dev Returns the downcasted int232 from int256, reverting on
* overflow (when the input is less than smallest int232 or
* greater than largest int232).
*
* Counterpart to Solidity's `int232` operator.
*
* Requirements:
*
* - input must fit into 232 bits
*/
function toInt232(int256 value) internal pure returns (int232 downcasted) {
downcasted = int232(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(232, value);
}
}
/**
* @dev Returns the downcasted int224 from int256, reverting on
* overflow (when the input is less than smallest int224 or
* greater than largest int224).
*
* Counterpart to Solidity's `int224` operator.
*
* Requirements:
*
* - input must fit into 224 bits
*/
function toInt224(int256 value) internal pure returns (int224 downcasted) {
downcasted = int224(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(224, value);
}
}
/**
* @dev Returns the downcasted int216 from int256, reverting on
* overflow (when the input is less than smallest int216 or
* greater than largest int216).
*
* Counterpart to Solidity's `int216` operator.
*
* Requirements:
*
* - input must fit into 216 bits
*/
function toInt216(int256 value) internal pure returns (int216 downcasted) {
downcasted = int216(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(216, value);
}
}
/**
* @dev Returns the downcasted int208 from int256, reverting on
* overflow (when the input is less than smallest int208 or
* greater than largest int208).
*
* Counterpart to Solidity's `int208` operator.
*
* Requirements:
*
* - input must fit into 208 bits
*/
function toInt208(int256 value) internal pure returns (int208 downcasted) {
downcasted = int208(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(208, value);
}
}
/**
* @dev Returns the downcasted int200 from int256, reverting on
* overflow (when the input is less than smallest int200 or
* greater than largest int200).
*
* Counterpart to Solidity's `int200` operator.
*
* Requirements:
*
* - input must fit into 200 bits
*/
function toInt200(int256 value) internal pure returns (int200 downcasted) {
downcasted = int200(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(200, value);
}
}
/**
* @dev Returns the downcasted int192 from int256, reverting on
* overflow (when the input is less than smallest int192 or
* greater than largest int192).
*
* Counterpart to Solidity's `int192` operator.
*
* Requirements:
*
* - input must fit into 192 bits
*/
function toInt192(int256 value) internal pure returns (int192 downcasted) {
downcasted = int192(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(192, value);
}
}
/**
* @dev Returns the downcasted int184 from int256, reverting on
* overflow (when the input is less than smallest int184 or
* greater than largest int184).
*
* Counterpart to Solidity's `int184` operator.
*
* Requirements:
*
* - input must fit into 184 bits
*/
function toInt184(int256 value) internal pure returns (int184 downcasted) {
downcasted = int184(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(184, value);
}
}
/**
* @dev Returns the downcasted int176 from int256, reverting on
* overflow (when the input is less than smallest int176 or
* greater than largest int176).
*
* Counterpart to Solidity's `int176` operator.
*
* Requirements:
*
* - input must fit into 176 bits
*/
function toInt176(int256 value) internal pure returns (int176 downcasted) {
downcasted = int176(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(176, value);
}
}
/**
* @dev Returns the downcasted int168 from int256, reverting on
* overflow (when the input is less than smallest int168 or
* greater than largest int168).
*
* Counterpart to Solidity's `int168` operator.
*
* Requirements:
*
* - input must fit into 168 bits
*/
function toInt168(int256 value) internal pure returns (int168 downcasted) {
downcasted = int168(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(168, value);
}
}
/**
* @dev Returns the downcasted int160 from int256, reverting on
* overflow (when the input is less than smallest int160 or
* greater than largest int160).
*
* Counterpart to Solidity's `int160` operator.
*
* Requirements:
*
* - input must fit into 160 bits
*/
function toInt160(int256 value) internal pure returns (int160 downcasted) {
downcasted = int160(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(160, value);
}
}
/**
* @dev Returns the downcasted int152 from int256, reverting on
* overflow (when the input is less than smallest int152 or
* greater than largest int152).
*
* Counterpart to Solidity's `int152` operator.
*
* Requirements:
*
* - input must fit into 152 bits
*/
function toInt152(int256 value) internal pure returns (int152 downcasted) {
downcasted = int152(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(152, value);
}
}
/**
* @dev Returns the downcasted int144 from int256, reverting on
* overflow (when the input is less than smallest int144 or
* greater than largest int144).
*
* Counterpart to Solidity's `int144` operator.
*
* Requirements:
*
* - input must fit into 144 bits
*/
function toInt144(int256 value) internal pure returns (int144 downcasted) {
downcasted = int144(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(144, value);
}
}
/**
* @dev Returns the downcasted int136 from int256, reverting on
* overflow (when the input is less than smallest int136 or
* greater than largest int136).
*
* Counterpart to Solidity's `int136` operator.
*
* Requirements:
*
* - input must fit into 136 bits
*/
function toInt136(int256 value) internal pure returns (int136 downcasted) {
downcasted = int136(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(136, value);
}
}
/**
* @dev Returns the downcasted int128 from int256, reverting on
* overflow (when the input is less than smallest int128 or
* greater than largest int128).
*
* Counterpart to Solidity's `int128` operator.
*
* Requirements:
*
* - input must fit into 128 bits
*/
function toInt128(int256 value) internal pure returns (int128 downcasted) {
downcasted = int128(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(128, value);
}
}
/**
* @dev Returns the downcasted int120 from int256, reverting on
* overflow (when the input is less than smallest int120 or
* greater than largest int120).
*
* Counterpart to Solidity's `int120` operator.
*
* Requirements:
*
* - input must fit into 120 bits
*/
function toInt120(int256 value) internal pure returns (int120 downcasted) {
downcasted = int120(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(120, value);
}
}
/**
* @dev Returns the downcasted int112 from int256, reverting on
* overflow (when the input is less than smallest int112 or
* greater than largest int112).
*
* Counterpart to Solidity's `int112` operator.
*
* Requirements:
*
* - input must fit into 112 bits
*/
function toInt112(int256 value) internal pure returns (int112 downcasted) {
downcasted = int112(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(112, value);
}
}
/**
* @dev Returns the downcasted int104 from int256, reverting on
* overflow (when the input is less than smallest int104 or
* greater than largest int104).
*
* Counterpart to Solidity's `int104` operator.
*
* Requirements:
*
* - input must fit into 104 bits
*/
function toInt104(int256 value) internal pure returns (int104 downcasted) {
downcasted = int104(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(104, value);
}
}
/**
* @dev Returns the downcasted int96 from int256, reverting on
* overflow (when the input is less than smallest int96 or
* greater than largest int96).
*
* Counterpart to Solidity's `int96` operator.
*
* Requirements:
*
* - input must fit into 96 bits
*/
function toInt96(int256 value) internal pure returns (int96 downcasted) {
downcasted = int96(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(96, value);
}
}
/**
* @dev Returns the downcasted int88 from int256, reverting on
* overflow (when the input is less than smallest int88 or
* greater than largest int88).
*
* Counterpart to Solidity's `int88` operator.
*
* Requirements:
*
* - input must fit into 88 bits
*/
function toInt88(int256 value) internal pure returns (int88 downcasted) {
downcasted = int88(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(88, value);
}
}
/**
* @dev Returns the downcasted int80 from int256, reverting on
* overflow (when the input is less than smallest int80 or
* greater than largest int80).
*
* Counterpart to Solidity's `int80` operator.
*
* Requirements:
*
* - input must fit into 80 bits
*/
function toInt80(int256 value) internal pure returns (int80 downcasted) {
downcasted = int80(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(80, value);
}
}
/**
* @dev Returns the downcasted int72 from int256, reverting on
* overflow (when the input is less than smallest int72 or
* greater than largest int72).
*
* Counterpart to Solidity's `int72` operator.
*
* Requirements:
*
* - input must fit into 72 bits
*/
function toInt72(int256 value) internal pure returns (int72 downcasted) {
downcasted = int72(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(72, value);
}
}
/**
* @dev Returns the downcasted int64 from int256, reverting on
* overflow (when the input is less than smallest int64 or
* greater than largest int64).
*
* Counterpart to Solidity's `int64` operator.
*
* Requirements:
*
* - input must fit into 64 bits
*/
function toInt64(int256 value) internal pure returns (int64 downcasted) {
downcasted = int64(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(64, value);
}
}
/**
* @dev Returns the downcasted int56 from int256, reverting on
* overflow (when the input is less than smallest int56 or
* greater than largest int56).
*
* Counterpart to Solidity's `int56` operator.
*
* Requirements:
*
* - input must fit into 56 bits
*/
function toInt56(int256 value) internal pure returns (int56 downcasted) {
downcasted = int56(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(56, value);
}
}
/**
* @dev Returns the downcasted int48 from int256, reverting on
* overflow (when the input is less than smallest int48 or
* greater than largest int48).
*
* Counterpart to Solidity's `int48` operator.
*
* Requirements:
*
* - input must fit into 48 bits
*/
function toInt48(int256 value) internal pure returns (int48 downcasted) {
downcasted = int48(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(48, value);
}
}
/**
* @dev Returns the downcasted int40 from int256, reverting on
* overflow (when the input is less than smallest int40 or
* greater than largest int40).
*
* Counterpart to Solidity's `int40` operator.
*
* Requirements:
*
* - input must fit into 40 bits
*/
function toInt40(int256 value) internal pure returns (int40 downcasted) {
downcasted = int40(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(40, value);
}
}
/**
* @dev Returns the downcasted int32 from int256, reverting on
* overflow (when the input is less than smallest int32 or
* greater than largest int32).
*
* Counterpart to Solidity's `int32` operator.
*
* Requirements:
*
* - input must fit into 32 bits
*/
function toInt32(int256 value) internal pure returns (int32 downcasted) {
downcasted = int32(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(32, value);
}
}
/**
* @dev Returns the downcasted int24 from int256, reverting on
* overflow (when the input is less than smallest int24 or
* greater than largest int24).
*
* Counterpart to Solidity's `int24` operator.
*
* Requirements:
*
* - input must fit into 24 bits
*/
function toInt24(int256 value) internal pure returns (int24 downcasted) {
downcasted = int24(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(24, value);
}
}
/**
* @dev Returns the downcasted int16 from int256, reverting on
* overflow (when the input is less than smallest int16 or
* greater than largest int16).
*
* Counterpart to Solidity's `int16` operator.
*
* Requirements:
*
* - input must fit into 16 bits
*/
function toInt16(int256 value) internal pure returns (int16 downcasted) {
downcasted = int16(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(16, value);
}
}
/**
* @dev Returns the downcasted int8 from int256, reverting on
* overflow (when the input is less than smallest int8 or
* greater than largest int8).
*
* Counterpart to Solidity's `int8` operator.
*
* Requirements:
*
* - input must fit into 8 bits
*/
function toInt8(int256 value) internal pure returns (int8 downcasted) {
downcasted = int8(value);
if (downcasted != value) {
revert SafeCastOverflowedIntDowncast(8, value);
}
}
/**
* @dev Converts an unsigned uint256 into a signed int256.
*
* Requirements:
*
* - input must be less than or equal to maxInt256.
*/
function toInt256(uint256 value) internal pure returns (int256) {
// Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive
if (value > uint256(type(int256).max)) {
revert SafeCastOverflowedUintToInt(value);
}
return int256(value);
}
/**
* @dev Cast a boolean (false or true) to a uint256 (0 or 1) with no jump.
*/
function toUint(bool b) internal pure returns (uint256 u) {
assembly ("memory-safe") {
u := iszero(iszero(b))
}
}
}
File 26 of 59: contracts/TokenBoundAccount/TokenBoundAccount.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {IERC165} from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {IERC1271} from "@openzeppelin/contracts/interfaces/IERC1271.sol";
import {SignatureChecker} from "@openzeppelin/contracts/utils/cryptography/SignatureChecker.sol";
import {ITokenBoundAccount} from "./interfaces/ITokenBoundAccount.sol";
import {TokenBoundAccountLib} from "./libraries/TokenBoundAccountLib.sol";
contract TokenBoundAccount is IERC165, IERC1271, ITokenBoundAccount {
uint256 public nonce;
receive() external payable {}
function executeCall(
address to,
uint256 value,
bytes calldata data
) external payable returns (bytes memory result) {
require(msg.sender == owner(), "Not token owner");
++nonce;
emit TransactionExecuted(to, value, data);
bool success;
(success, result) = to.call{value: value}(data);
if (!success) {
assembly {
revert(add(result, 32), mload(result))
}
}
}
function token() external view returns (uint256, address, uint256) {
return TokenBoundAccountLib.token();
}
function owner() public view returns (address) {
(uint256 chainId, address tokenContract, uint256 tokenId) = this.token();
if (chainId != block.chainid) return address(0);
return IERC721(tokenContract).ownerOf(tokenId);
}
function supportsInterface(bytes4 interfaceId) public pure returns (bool) {
return (interfaceId == type(IERC165).interfaceId || interfaceId == type(ITokenBoundAccount).interfaceId);
}
function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue) {
bool isValid = SignatureChecker.isValidSignatureNow(owner(), hash, signature);
if (isValid) {
return IERC1271.isValidSignature.selector;
}
return "";
}
}
File 27 of 59: contracts/Marketplace/IMarketplace.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
/**
* @title Marketplace Interface
*
*/
interface IMarketplace {
enum ItemStatus {
OPENING,
SOLD,
CLOSED
}
function makeItem(address _nft, uint256 _tokenId, address _paymentToken, uint256 _price, address _beneficiary) external;
function closeItem(uint256 _itemId) external;
error InvalidFeeReceiver();
error InvalidFeePercent();
error InvalidNft();
error InvalidPrice();
error InvalidBeneficiary();
error NotPermittedToken();
error NotExistedItem();
error NotOpeningItem();
error NotEnougnETH();
error OnlyItemOwner();
}
File 28 of 59: @openzeppelin/contracts/utils/introspection/ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/ERC165.sol)
pragma solidity ^0.8.20;
import {IERC165} from "./IERC165.sol";
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC-165 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);
* }
* ```
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
File 29 of 59: contracts/utils/Permission.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
/**
* @title Permission
*
* @notice This abstract contract provides a modifier to restrict the permission of functions.
*/
abstract contract Permission is Ownable {
/* ******* */
/* STORAGE */
/* ******* */
/**
* @notice _admins mapping from token ID to isAdmin status
*/
mapping(address => bool) public admins;
/* ****** */
/* EVENTS */
/* ****** */
event SetAdmin(address indexed user, bool allow);
/* ********* */
/* ERRORS */
/* ********* */
error AdminUnauthorizedAccount(address account);
error PermissionUnauthorizedAccount(address account);
error InvalidAddress();
error InvalidLength();
/* ********* */
/* MODIFIERS */
/* ********* */
/**
* Throw exception of caller is not admin
*/
modifier onlyAdmin() {
if (owner() != _msgSender() && !admins[_msgSender()]) {
revert AdminUnauthorizedAccount(_msgSender());
}
_;
}
/**
* Throw exception if _account is not permitted
* @param _account Account will be checked
*/
modifier permittedTo(address _account) {
if (_msgSender() != _account) {
revert PermissionUnauthorizedAccount(_msgSender());
}
_;
}
/* ****************** */
/* PUBLIC FUNCTIONS */
/* ****************** */
/**
* @notice Add/Remove an admin.
* @dev Only owner can call this function.
* @param _user user address
* @param _allow Specific user will be set as admin or not
*/
function setAdmin(address _user, bool _allow) public virtual onlyOwner {
_setAdmin(_user, _allow);
}
/**
* @notice Add/Remove an admin.
* @dev Only owner can call this function.
* @param _users List of user address
* @param _allow Specific users will be set as admin or not
*/
function setAdmins(address[] memory _users, bool _allow) public virtual onlyOwner {
if (_users.length == 0) revert InvalidLength();
for (uint256 i = 0; i < _users.length; i++) {
_setAdmin(_users[i], _allow);
}
}
/* ****************** */
/* INTERNAL FUNCTIONS */
/* ****************** */
/**
* @notice Add/Remove an admin.
* @dev Only owner can call this function.
* @param _user User address
* @param _allow Specific user will be set as admin or not
*
* emit {SetAdmin} event
*/
function _setAdmin(address _user, bool _allow) internal virtual {
if (_user == address(0)) revert InvalidAddress();
admins[_user] = _allow;
emit SetAdmin(_user, _allow);
}
/* ****************** */
/* VIEW FUNCTIONS */
/* ****************** */
/**
* @notice Check account whether it is the admin role.
* @dev Everyone can call
* @param _account User's account will be checkedd
*/
function isAdmin(address _account) external view returns (bool) {
return owner() == _account || admins[_account];
}
}
File 30 of 59: contracts/loans/direct/DirectLoanFixedOffer.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {DirectLoanBaseMinimal, NFTfiSigningUtils, LoanChecksAndCalculations} from "./DirectLoanBaseMinimal.sol";
/**
* @title DirectLoanFixed
* @notice Main contract for Loan Direct Loans Fixed Type. This contract manages the ability to create NFT-backed
* peer-to-peer loans of type Fixed (agreed to be a fixed-repayment loan) where the borrower pays the
* maximumRepaymentAmount regardless of whether they repay early or not.
*
* There are two ways to commence an NFT-backed loan:
*
* a. The borrower accepts a lender's offer by calling `acceptOffer`.
* 1. the borrower calls nftContract.approveAll(Loan), approving the Loan contract to move their NFT's on their
* be1alf.
* 2. the lender calls erc20Contract.approve(Loan), allowing Loan to move the lender's ERC20 tokens on their
* behalf.
* 3. the lender signs an off-chain message, proposing its offer terms.
* 4. the borrower calls `acceptOffer` to accept these terms and enter into the loan. The NFT is stored in
* the contract, the borrower receives the loan principal in the specified ERC20 currency, the lender receives an
* Loan promissory note (in ERC721 form) that represents the rights to either the principal-plus-interest, or the
* underlying NFT collateral if the borrower does not pay back in time, and the borrower receives obligation receipt
* (in ERC721 form) that gives them the right to pay back the loan and get the collateral back.
*
* b. The lender accepts a borrowe's binding terms by calling `acceptListing`.
* 1. the borrower calls nftContract.approveAll(Loan), approving the Loan contract to move their NFT's on their
* be1alf.
* 2. the lender calls erc20Contract.approve(Loan), allowing Loan to move the lender's ERC20 tokens on their
* behalf.
* 3. the borrower signs an off-chain message, proposing its binding terms.
* 4. the lender calls `acceptListing` with an offer matching the binding terms and enter into the loan. The NFT is
* stored in the contract, the borrower receives the loan principal in the specified ERC20 currency, the lender
* receives an Loan promissory note (in ERC721 form) that represents the rights to either the principal-plus-interest,
* or the underlying NFT collateral if the borrower does not pay back in time, and the borrower receives obligation
* receipt (in ERC721 form) that gives them the right to pay back the loan and get the collateral back.
*
* The lender can freely transfer and trade this ERC721 promissory note as they wish, with the knowledge that
* transferring the ERC721 promissory note tranfsers the rights to principal-plus-interest and/or collateral, and that
* they will no longer have a claim on the loan. The ERC721 promissory note itself represents that claim.
*
* The borrower can freely transfer and trade this ERC721 obligaiton receipt as they wish, with the knowledge that
* transferring the ERC721 obligaiton receipt tranfsers the rights right to pay back the loan and get the collateral
* back.
*
*
* A loan may end in one of two ways:
* - First, a borrower may call Loan.payBackLoan() and pay back the loan plus interest at any time, in which case they
* receive their NFT back in the same transaction.
* - Second, if the loan's duration has passed and the loan has not been paid back yet, a lender can call
* Loan.liquidateOverdueLoan(), in which case they receive the underlying NFT collateral and forfeit the rights to the
* principal-plus-interest, which the borrower now keeps.
*/
contract DirectLoanFixedOffer is DirectLoanBaseMinimal {
/* *********** */
/* CONSTRUCTOR */
/* *********** */
/**
* @dev Sets `hub` and permitted erc20-s
*
* @param _admin - Initial admin of this contract.
* @param _permittedErc20s - list of permitted ERC20 token contract addresses
*/
constructor(address _admin, address[] memory _permittedErc20s) DirectLoanBaseMinimal(_admin, _permittedErc20s) {
// solhint-disable-previous-line no-empty-blocks
}
/* ********* */
/* FUNCTIONS */
/* ********* */
/**
* @notice This function is called by the borrower when accepting a lender's offer to begin a loan.
*
* @param _loanId - offchain id of loan
* @param _offer - The offer made by the lender.
* @param _signature - The components of the lender's signature.
*/
function acceptOffer(bytes32 _loanId, Offer memory _offer, Signature memory _signature) external whenNotPaused nonReentrant {
_loanSanityChecks(_offer);
_loanSanityChecksOffer(_offer);
address lender = _offer.lendingPool != address(0) ? _offer.lendingPool : _signature.signer;
_acceptOffer(_loanId, _setupLoanTerms(_offer, lender), _offer, _signature);
}
/* ****************** */
/* INTERNAL FUNCTIONS */
/* ****************** */
/**
* @notice This function is called by the borrower when accepting a lender's offer to begin a loan.
*
* @param _loanTerms - The main Loan Terms struct. This data is saved upon loan creation on loanIdToLoan.
* @param _offer - The offer made by the lender.
* @param _signature - The components of the lender's signature.
*/
function _acceptOffer(bytes32 _loanId, LoanTerms memory _loanTerms, Offer memory _offer, Signature memory _signature) internal {
// Check loan nonces. These are different from Ethereum account nonces.
// Here, these are uint256 numbers that should uniquely identify
// each signature for each user (i.e. each user should only create one
// off-chain signature for each nonce, with a nonce being any arbitrary
// uint256 value that they have not used yet for an off-chain Loan
// signature).
require(!_nonceHasBeenUsedForUser[_signature.signer][_signature.nonce], "Lender nonce invalid");
_nonceHasBeenUsedForUser[_signature.signer][_signature.nonce] = true;
require(NFTfiSigningUtils.isValidLenderSignature(_offer, _signature), "Lender signature is invalid");
_createLoan(_loanId, _loanTerms, msg.sender, _loanTerms.lender);
// Emit an event with all relevant details from this transaction.
emit LoanStarted(_loanId, msg.sender, _loanTerms.lender, _loanTerms);
}
/**
* @dev Creates a `LoanTerms` struct using data sent as the lender's `_offer` on `acceptOffer`.
* This is needed in order to avoid stack too deep issues.
*/
function _setupLoanTerms(Offer memory _offer, address _lender) internal view returns (LoanTerms memory) {
return
LoanTerms({
erc20Denomination: _offer.erc20Denomination,
principalAmount: _offer.principalAmount,
maximumRepaymentAmount: _offer.maximumRepaymentAmount,
nftCollateralContract: _offer.nftCollateralContract,
nftCollateralId: _offer.nftCollateralId,
loanStartTime: uint64(block.timestamp),
duration: _offer.duration,
adminFeeInBasisPoints: _offer.adminFeeInBasisPoints,
borrower: msg.sender,
lender: _lender,
useLendingPool: _offer.lendingPool != address(0)
});
}
/**
* @dev Calculates the payoff amount and admin fee
*
* @param _loanTerms - Struct containing all the loan's parameters
*/
function _payoffAndFee(LoanTerms memory _loanTerms) internal pure override returns (uint256 adminFee, uint256 payoffAmount) {
// Calculate amounts to send to lender and admins
uint256 interestDue = _loanTerms.maximumRepaymentAmount - _loanTerms.principalAmount;
adminFee = LoanChecksAndCalculations.computeAdminFee(interestDue, uint256(_loanTerms.adminFeeInBasisPoints));
payoffAmount = _loanTerms.maximumRepaymentAmount - adminFee;
}
/**
* @dev Function that performs some validation checks over loan parameters when accepting an offer
*
*/
function _loanSanityChecksOffer(Offer memory _offer) internal pure {
require(_offer.maximumRepaymentAmount >= _offer.principalAmount, "Negative interest rate loans are not allowed.");
}
}
File 31 of 59: contracts/LendingPool/LendingPool.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {Pausable} from "@openzeppelin/contracts/utils/Pausable.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import {SafeERC20, IERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {ERC721Holder} from "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";
import {Permission, Ownable} from "../utils/Permission.sol";
import {IMarketplace} from "../Marketplace/IMarketplace.sol";
import {ILendingStake} from "./interfaces/ILendingStake.sol";
/**
* @title LendingPool
* @dev A main management contract for lending pool.
*/
contract LendingPool is Permission, Pausable, ReentrancyGuard, ERC721Holder {
using SafeERC20 for IERC20;
address public loan;
address public lendingStake;
address public marketplace;
event SetLoan(address indexed oldValue, address indexed newValue);
event SetLendingStake(address indexed oldValue, address indexed newValue);
event SetMarketplace(address indexed oldValue, address indexed newValue);
event Disbursed(address indexed token, address indexed to, uint256 amount);
event PaidBack(address indexed token, uint256 amount);
event ListNftToMarket(address indexed nftContract, uint256 indexed nftTokenId, uint256 indexed price);
constructor(address _initialOwner) Ownable(_initialOwner) {}
/**
* @dev called by the owner to set loan contract address
*/
function setLoan(address _loan) external onlyOwner {
if (_loan == address(0)) revert InvalidAddress();
address _oldValue = loan;
loan = _loan;
emit SetLoan(_oldValue, loan);
}
/**
* @dev called by the owner to set lending stake contract address
*/
function setLendingStake(address _lendingStake) external onlyOwner {
if (_lendingStake == address(0)) revert InvalidAddress();
address _oldValue = lendingStake;
lendingStake = _lendingStake;
emit SetLendingStake(_oldValue, lendingStake);
}
/**
* @dev called by the owner to set marketplace contract address
*/
function setMarketplace(address _marketplace) external onlyOwner {
if (_marketplace == address(0)) revert InvalidAddress();
address _oldValue = marketplace;
marketplace = _marketplace;
emit SetMarketplace(_oldValue, marketplace);
}
/**
* @dev called by loan contract to disburse token to borrower
*/
function informDisburse(address _token, address _to, uint256 _amount) external nonReentrant whenNotPaused permittedTo(loan) {
ILendingStake(lendingStake).approve(_amount);
IERC20(_token).safeTransferFrom(lendingStake, _to, _amount);
emit Disbursed(_token, _to, _amount);
}
/**
* @dev called by loan contract to pay back token to lending stake
*/
function informPayBack(address _token, uint256 _principal) external whenNotPaused permittedTo(loan) {
IERC20(_token).safeTransfer(lendingStake, _principal);
emit PaidBack(_token, _principal);
}
/**
* @dev called by the owner to list NFT to marketplace
*/
function listNftToMarket(address _nftContract, uint256 _nftTokenId, uint256 _price) external whenNotPaused onlyAdmin {
IERC721(_nftContract).approve(marketplace, _nftTokenId);
IMarketplace(marketplace).makeItem(_nftContract, _nftTokenId, ILendingStake(lendingStake).wXENE(), _price, lendingStake);
}
/**
* @dev called by the owner to withdraw NFT from marketplace
*/
function withdrawNftFromMarket(uint256 _marketItemId) external whenNotPaused onlyAdmin {
IMarketplace(marketplace).closeItem(_marketItemId);
}
/**
* @dev called by lending stake contract to approve token to pay rewards
*/
function approveToPayRewards(address _token, uint256 _amount) external whenNotPaused permittedTo(lendingStake) {
IERC20(_token).approve(lendingStake, _amount);
}
/**
* @dev called by the owner to rescue token from contract
*/
function rescueToken(address _token, address _to, uint256 _amount) external onlyOwner {
if (_to == address(0)) revert InvalidAddress();
IERC20(_token).safeTransfer(_to, _amount);
}
/**
* @dev called by the owner to rescue nft from contract
*/
function rescueNft(address _nftContract, uint256 _nftTokenId, address _to) external onlyOwner {
if (_to == address(0)) revert InvalidAddress();
IERC721(_nftContract).transferFrom(address(this), _to, _nftTokenId);
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() external onlyOwner whenNotPaused {
_pause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() external onlyOwner whenPaused {
_unpause();
}
}
File 32 of 59: @openzeppelin/contracts/utils/ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)
pragma solidity ^0.8.20;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
* consider using {ReentrancyGuardTransient} instead.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant NOT_ENTERED = 1;
uint256 private constant ENTERED = 2;
uint256 private _status;
/**
* @dev Unauthorized reentrant call.
*/
error ReentrancyGuardReentrantCall();
constructor() {
_status = NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, _status will be NOT_ENTERED
if (_status == ENTERED) {
revert ReentrancyGuardReentrantCall();
}
// Any calls to nonReentrant after this point will fail
_status = ENTERED;
}
function _nonReentrantAfter() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = NOT_ENTERED;
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns (bool) {
return _status == ENTERED;
}
}
File 33 of 59: @openzeppelin/contracts/token/ERC721/ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC721/ERC721.sol)
pragma solidity ^0.8.20;
import {IERC721} from "./IERC721.sol";
import {IERC721Metadata} from "./extensions/IERC721Metadata.sol";
import {ERC721Utils} from "./utils/ERC721Utils.sol";
import {Context} from "../../utils/Context.sol";
import {Strings} from "../../utils/Strings.sol";
import {IERC165, ERC165} from "../../utils/introspection/ERC165.sol";
import {IERC721Errors} from "../../interfaces/draft-IERC6093.sol";
/**
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC-721] Non-Fungible Token Standard, including
* the Metadata extension, but not including the Enumerable extension, which is available separately as
* {ERC721Enumerable}.
*/
abstract contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Errors {
using Strings for uint256;
// Token name
string private _name;
// Token symbol
string private _symbol;
mapping(uint256 tokenId => address) private _owners;
mapping(address owner => uint256) private _balances;
mapping(uint256 tokenId => address) private _tokenApprovals;
mapping(address owner => mapping(address operator => 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 returns (uint256) {
if (owner == address(0)) {
revert ERC721InvalidOwner(address(0));
}
return _balances[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual returns (address) {
return _requireOwned(tokenId);
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() public view virtual returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() public view virtual returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual returns (string memory) {
_requireOwned(tokenId);
string memory baseURI = _baseURI();
return bytes(baseURI).length > 0 ? string.concat(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 {
_approve(to, tokenId, _msgSender());
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual returns (address) {
_requireOwned(tokenId);
return _getApproved(tokenId);
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual {
_setApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(address from, address to, uint256 tokenId) public virtual {
if (to == address(0)) {
revert ERC721InvalidReceiver(address(0));
}
// Setting an "auth" arguments enables the `_isAuthorized` check which verifies that the token exists
// (from != 0). Therefore, it is not needed to verify that the return value is not 0 here.
address previousOwner = _update(to, tokenId, _msgSender());
if (previousOwner != from) {
revert ERC721IncorrectOwner(from, tokenId, previousOwner);
}
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) public {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual {
transferFrom(from, to, tokenId);
ERC721Utils.checkOnERC721Received(_msgSender(), from, to, tokenId, data);
}
/**
* @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
*
* IMPORTANT: Any overrides to this function that add ownership of tokens not tracked by the
* core ERC-721 logic MUST be matched with the use of {_increaseBalance} to keep balances
* consistent with ownership. The invariant to preserve is that for any address `a` the value returned by
* `balanceOf(a)` must be equal to the number of tokens such that `_ownerOf(tokenId)` is `a`.
*/
function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
return _owners[tokenId];
}
/**
* @dev Returns the approved address for `tokenId`. Returns 0 if `tokenId` is not minted.
*/
function _getApproved(uint256 tokenId) internal view virtual returns (address) {
return _tokenApprovals[tokenId];
}
/**
* @dev Returns whether `spender` is allowed to manage `owner`'s tokens, or `tokenId` in
* particular (ignoring whether it is owned by `owner`).
*
* WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not verify this
* assumption.
*/
function _isAuthorized(address owner, address spender, uint256 tokenId) internal view virtual returns (bool) {
return
spender != address(0) &&
(owner == spender || isApprovedForAll(owner, spender) || _getApproved(tokenId) == spender);
}
/**
* @dev Checks if `spender` can operate on `tokenId`, assuming the provided `owner` is the actual owner.
* Reverts if:
* - `spender` does not have approval from `owner` for `tokenId`.
* - `spender` does not have approval to manage all of `owner`'s assets.
*
* WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not verify this
* assumption.
*/
function _checkAuthorized(address owner, address spender, uint256 tokenId) internal view virtual {
if (!_isAuthorized(owner, spender, tokenId)) {
if (owner == address(0)) {
revert ERC721NonexistentToken(tokenId);
} else {
revert ERC721InsufficientApproval(spender, tokenId);
}
}
}
/**
* @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
*
* NOTE: the value is limited to type(uint128).max. This protect against _balance overflow. It is unrealistic that
* a uint256 would ever overflow from increments when these increments are bounded to uint128 values.
*
* WARNING: Increasing an account's balance using this function tends to be paired with an override of the
* {_ownerOf} function to resolve the ownership of the corresponding tokens so that balances and ownership
* remain consistent with one another.
*/
function _increaseBalance(address account, uint128 value) internal virtual {
unchecked {
_balances[account] += value;
}
}
/**
* @dev Transfers `tokenId` from its current owner to `to`, or alternatively mints (or burns) if the current owner
* (or `to`) is the zero address. Returns the owner of the `tokenId` before the update.
*
* The `auth` argument is optional. If the value passed is non 0, then this function will check that
* `auth` is either the owner of the token, or approved to operate on the token (by the owner).
*
* Emits a {Transfer} event.
*
* NOTE: If overriding this function in a way that tracks balances, see also {_increaseBalance}.
*/
function _update(address to, uint256 tokenId, address auth) internal virtual returns (address) {
address from = _ownerOf(tokenId);
// Perform (optional) operator check
if (auth != address(0)) {
_checkAuthorized(from, auth, tokenId);
}
// Execute the update
if (from != address(0)) {
// Clear approval. No need to re-authorize or emit the Approval event
_approve(address(0), tokenId, address(0), false);
unchecked {
_balances[from] -= 1;
}
}
if (to != address(0)) {
unchecked {
_balances[to] += 1;
}
}
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
return from;
}
/**
* @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 {
if (to == address(0)) {
revert ERC721InvalidReceiver(address(0));
}
address previousOwner = _update(to, tokenId, address(0));
if (previousOwner != address(0)) {
revert ERC721InvalidSender(address(0));
}
}
/**
* @dev Mints `tokenId`, transfers it to `to` and checks for `to` acceptance.
*
* 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 {
_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);
ERC721Utils.checkOnERC721Received(_msgSender(), address(0), to, tokenId, data);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
* This is an internal function that does not check if the sender is authorized to operate on the token.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/
function _burn(uint256 tokenId) internal {
address previousOwner = _update(address(0), tokenId, address(0));
if (previousOwner == address(0)) {
revert ERC721NonexistentToken(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 {
if (to == address(0)) {
revert ERC721InvalidReceiver(address(0));
}
address previousOwner = _update(to, tokenId, address(0));
if (previousOwner == address(0)) {
revert ERC721NonexistentToken(tokenId);
} else if (previousOwner != from) {
revert ERC721IncorrectOwner(from, tokenId, previousOwner);
}
}
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking that contract recipients
* are aware of the ERC-721 standard 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 like {safeTransferFrom} in the sense that it invokes
* {IERC721Receiver-onERC721Received} on the receiver, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `tokenId` token must exist and be owned by `from`.
* - `to` cannot be the zero address.
* - `from` cannot be the zero address.
* - 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) internal {
_safeTransfer(from, to, tokenId, "");
}
/**
* @dev Same as {xref-ERC721-_safeTransfer-address-address-uint256-}[`_safeTransfer`], with an additional `data` parameter which is
* forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
*/
function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {
_transfer(from, to, tokenId);
ERC721Utils.checkOnERC721Received(_msgSender(), from, to, tokenId, data);
}
/**
* @dev Approve `to` to operate on `tokenId`
*
* The `auth` argument is optional. If the value passed is non 0, then this function will check that `auth` is
* either the owner of the token, or approved to operate on all tokens held by this owner.
*
* Emits an {Approval} event.
*
* Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
*/
function _approve(address to, uint256 tokenId, address auth) internal {
_approve(to, tokenId, auth, true);
}
/**
* @dev Variant of `_approve` with an optional flag to enable or disable the {Approval} event. The event is not
* emitted in the context of transfers.
*/
function _approve(address to, uint256 tokenId, address auth, bool emitEvent) internal virtual {
// Avoid reading the owner unless necessary
if (emitEvent || auth != address(0)) {
address owner = _requireOwned(tokenId);
// We do not use _isAuthorized because single-token approvals should not be able to call approve
if (auth != address(0) && owner != auth && !isApprovedForAll(owner, auth)) {
revert ERC721InvalidApprover(auth);
}
if (emitEvent) {
emit Approval(owner, to, tokenId);
}
}
_tokenApprovals[tokenId] = to;
}
/**
* @dev Approve `operator` to operate on all of `owner` tokens
*
* Requirements:
* - operator can't be the address zero.
*
* Emits an {ApprovalForAll} event.
*/
function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
if (operator == address(0)) {
revert ERC721InvalidOperator(operator);
}
_operatorApprovals[owner][operator] = approved;
emit ApprovalForAll(owner, operator, approved);
}
/**
* @dev Reverts if the `tokenId` doesn't have a current owner (it hasn't been minted, or it has been burned).
* Returns the owner.
*
* Overrides to ownership logic should be done to {_ownerOf}.
*/
function _requireOwned(uint256 tokenId) internal view returns (address) {
address owner = _ownerOf(tokenId);
if (owner == address(0)) {
revert ERC721NonexistentToken(tokenId);
}
return owner;
}
}
File 34 of 59: @openzeppelin/contracts/interfaces/IERC4906.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/IERC4906.sol)
pragma solidity ^0.8.20;
import {IERC165} from "./IERC165.sol";
import {IERC721} from "./IERC721.sol";
/// @title ERC-721 Metadata Update Extension
interface IERC4906 is IERC165, IERC721 {
/// @dev This event emits when the metadata of a token is changed.
/// So that the third-party platforms such as NFT market could
/// timely update the images and related attributes of the NFT.
event MetadataUpdate(uint256 _tokenId);
/// @dev This event emits when the metadata of a range of tokens is changed.
/// So that the third-party platforms such as NFT market could
/// timely update the images and related attributes of the NFTs.
event BatchMetadataUpdate(uint256 _fromTokenId, uint256 _toTokenId);
}
File 35 of 59: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.2.0) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.20;
import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC-20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
/**
* @dev An operation with an ERC-20 token failed.
*/
error SafeERC20FailedOperation(address token);
/**
* @dev Indicates a failed `decreaseAllowance` request.
*/
error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);
/**
* @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
}
/**
* @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
* calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
*/
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
}
/**
* @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*
* IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
* smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
* this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
* that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
*/
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 oldAllowance = token.allowance(address(this), spender);
forceApprove(token, spender, oldAllowance + value);
}
/**
* @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
* value, non-reverting calls are assumed to be successful.
*
* IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
* smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
* this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
* that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
*/
function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
unchecked {
uint256 currentAllowance = token.allowance(address(this), spender);
if (currentAllowance < requestedDecrease) {
revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
}
forceApprove(token, spender, currentAllowance - requestedDecrease);
}
}
/**
* @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
* to be set to zero before setting it to a non-zero value, such as USDT.
*
* NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
* only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
* set here.
*/
function forceApprove(IERC20 token, address spender, uint256 value) internal {
bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));
if (!_callOptionalReturnBool(token, approvalCall)) {
_callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
_callOptionalReturn(token, approvalCall);
}
}
/**
* @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
* code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
* targeting contracts.
*
* Reverts if the returned value is other than `true`.
*/
function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
if (to.code.length == 0) {
safeTransfer(token, to, value);
} else if (!token.transferAndCall(to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
* has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
* targeting contracts.
*
* Reverts if the returned value is other than `true`.
*/
function transferFromAndCallRelaxed(
IERC1363 token,
address from,
address to,
uint256 value,
bytes memory data
) internal {
if (to.code.length == 0) {
safeTransferFrom(token, from, to, value);
} else if (!token.transferFromAndCall(from, to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
* code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
* targeting contracts.
*
* NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
* Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
* once without retrying, and relies on the returned value to be true.
*
* Reverts if the returned value is other than `true`.
*/
function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
if (to.code.length == 0) {
forceApprove(token, to, value);
} else if (!token.approveAndCall(to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*
* This is a variant of {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
uint256 returnSize;
uint256 returnValue;
assembly ("memory-safe") {
let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
// bubble errors
if iszero(success) {
let ptr := mload(0x40)
returndatacopy(ptr, 0, returndatasize())
revert(ptr, returndatasize())
}
returnSize := returndatasize()
returnValue := mload(0)
}
if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*
* This is a variant of {_callOptionalReturn} that silently catches all reverts and returns a bool instead.
*/
function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
bool success;
uint256 returnSize;
uint256 returnValue;
assembly ("memory-safe") {
success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
returnSize := returndatasize()
returnValue := mload(0)
}
return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
}
}
File 36 of 59: contracts/loans/direct/LoanData.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
/**
* @title LoanData
* @notice An interface containg the main Loan struct shared by Direct Loans types.
*/
interface LoanData {
/* ********** */
/* DATA TYPES */
/* ********** */
/**
* @notice The main Loan Terms struct. This data is saved upon loan creation.
*
* @param erc20Denomination - The address of the ERC20 contract of the currency being used as principal/interest
* for this loan.
* @param principalAmount - The original sum of money transferred from lender to borrower at the beginning of
* the loan, measured in erc20Denomination's smallest units.
* @param maximumRepaymentAmount - The maximum amount of money that the borrower would be required to retrieve their
* collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
* to pay this amount to retrieve their collateral, regardless of whether they repay early.
* @param nftCollateralContract - The address of the the NFT collateral contract.
* @param nftCollateralId - The ID within the NFTCollateralContract for the NFT being used as collateral for this
* loan. The NFT is stored within this contract during the duration of the loan.
* @param loanStartTime - The block.timestamp when the loan first began (measured in seconds).
* @param duration - The amount of time (measured in seconds) that can elapse before the lender can liquidate
* the loan and seize the underlying collateral NFT.
* @param adminFeeInBasisPoints - The percent (measured in basis points) of the interest earned that will be
* taken as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
* attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
* earned.
* @param lender - Address of lender
* @param useLendingPool - If true, lender is a contract
*/
struct LoanTerms {
uint256 principalAmount;
uint256 maximumRepaymentAmount;
uint256 nftCollateralId;
address erc20Denomination;
uint32 duration;
uint16 adminFeeInBasisPoints;
uint64 loanStartTime;
address nftCollateralContract;
address borrower;
address lender;
bool useLendingPool;
}
/**
* @notice The offer made by the lender. Used as parameter on both acceptOffer (initiated by the borrower) and
* acceptListing (initiated by the lender).
*
* @param erc20Denomination - The address of the ERC20 contract of the currency being used as principal/interest
* for this loan.
* @param principalAmount - The original sum of money transferred from lender to borrower at the beginning of
* the loan, measured in erc20Denomination's smallest units.
* @param maximumRepaymentAmount - The maximum amount of money that the borrower would be required to retrieve their
* collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always
* have to pay this amount to retrieve their collateral, regardless of whether they repay early.
* @param nftCollateralContract - The address of the ERC721 contract of the NFT collateral.
* @param nftCollateralId - The ID within the NFTCollateralContract for the NFT being used as collateral for this
* loan. The NFT is stored within this contract during the duration of the loan.
* @param referrer - The address of the referrer who found the lender matching the listing, Zero address to signal
* this there is no referrer.
* @param duration - The amount of time (measured in seconds) that can elapse before the lender can liquidate
* the loan and seize the underlying collateral NFT.
* @param adminFeeInBasisPoints - The percent (measured in basis points) of the interest earned that will be
* taken as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
* attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
* earned.
* @param lendingPool - Lending pool address is contract that will disburse loan, signature signer must
* be admin of contract If lender is a wallet, this address must be ZERO address
*/
struct Offer {
uint256 principalAmount;
uint256 maximumRepaymentAmount;
uint256 nftCollateralId;
address nftCollateralContract;
uint32 duration;
uint16 adminFeeInBasisPoints;
address erc20Denomination;
address lendingPool;
}
/**
* @notice Signature related params. Used as parameter on both acceptOffer (containing borrower signature) and
* acceptListing (containing lender signature).
*
* @param signer - The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
* @param nonce - The nonce referred here is not the same as an Ethereum account's nonce.
* We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
* off-chain Loan orders. These nonce can be any uint256 value that the user has not previously used to sign an
* off-chain order. Each nonce can be used at most once per user within Loan, regardless of whether they are the
* lender or the borrower in that situation. This serves two purposes:
* - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
* - Second, it allows a user to cancel an off-chain order by calling Loan.cancelLoanCommitmentBeforeLoanHasBegun()
* , which marks the nonce as used and prevents any future loan from using the user's off-chain order that contains
* that nonce.
* @param expiry - Date when the signature expires
* @param signature - The ECDSA signature of the borrower or the lender, obtained off-chain ahead of time, signing
* the following combination of parameters:
* - Lender:
* - Offer.erc20Denomination
* - Offer.principalAmount
* - Offer.maximumRepaymentAmount
* - Offer.nftCollateralContract
* - Offer.nftCollateralId
* - Offer.duration
* - Offer.adminFeeInBasisPoints
* - Offer.useLendingPool
* - Offer.lendingPool
* - Signature.signer,
* - Signature.nonce,
* - Signature.expiry,
* - address of the loan type contract
* - chainId
*/
struct Signature {
uint256 nonce;
uint256 expiry;
address signer;
bytes signature;
}
}
File 37 of 59: @openzeppelin/contracts/interfaces/IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC165.sol)
pragma solidity ^0.8.20;
import {IERC165} from "../utils/introspection/IERC165.sol";
File 38 of 59: @openzeppelin/contracts/utils/math/Math.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/math/Math.sol)
pragma solidity ^0.8.20;
import {Panic} from "../Panic.sol";
import {SafeCast} from "./SafeCast.sol";
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
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 success flag (no overflow).
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool success, uint256 result) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the subtraction of two unsigned integers, with an success flag (no overflow).
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool success, uint256 result) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an success flag (no overflow).
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool success, uint256 result) {
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 success flag (no division by zero).
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool success, uint256 result) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a success flag (no division by zero).
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool success, uint256 result) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Branchless ternary evaluation for `a ? b : c`. Gas costs are constant.
*
* IMPORTANT: This function may reduce bytecode size and consume less gas when used standalone.
* However, the compiler may optimize Solidity ternary operations (i.e. `a ? b : c`) to only compute
* one branch when needed, making this function more expensive.
*/
function ternary(bool condition, uint256 a, uint256 b) internal pure returns (uint256) {
unchecked {
// branchless ternary works because:
// b ^ (a ^ b) == a
// b ^ 0 == b
return b ^ ((a ^ b) * SafeCast.toUint(condition));
}
}
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return ternary(a > b, a, b);
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return ternary(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.
Panic.panic(Panic.DIVISION_BY_ZERO);
}
// The following calculation ensures accurate ceiling division without overflow.
// Since a is non-zero, (a - 1) / b will not overflow.
// The largest possible result occurs when (a - 1) / b is type(uint256).max,
// but the largest value we can obtain is type(uint256).max - 1, which happens
// when a = type(uint256).max and b = 1.
unchecked {
return SafeCast.toUint(a > 0) * ((a - 1) / b + 1);
}
}
/**
* @dev Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or
* denominator == 0.
*
* 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 2²⁵⁶ and mod 2²⁵⁶ - 1, then use
// the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
// variables such that product = prod1 * 2²⁵⁶ + 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 2²⁵⁶. Also prevents denominator == 0.
if (denominator <= prod1) {
Panic.panic(ternary(denominator == 0, Panic.DIVISION_BY_ZERO, Panic.UNDER_OVERFLOW));
}
///////////////////////////////////////////////
// 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 2²⁵⁶ / 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 2²⁵⁶. Now that denominator is an odd number, it has an inverse modulo 2²⁵⁶ such
// that denominator * inv ≡ 1 mod 2²⁵⁶. Compute the inverse by starting with a seed that is correct for
// four bits. That is, denominator * inv ≡ 1 mod 2⁴.
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 2⁸
inverse *= 2 - denominator * inverse; // inverse mod 2¹⁶
inverse *= 2 - denominator * inverse; // inverse mod 2³²
inverse *= 2 - denominator * inverse; // inverse mod 2⁶⁴
inverse *= 2 - denominator * inverse; // inverse mod 2¹²⁸
inverse *= 2 - denominator * inverse; // inverse mod 2²⁵⁶
// 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 2²⁵⁶. Since the preconditions guarantee that the outcome is
// less than 2²⁵⁶, 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;
}
}
/**
* @dev 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) {
return mulDiv(x, y, denominator) + SafeCast.toUint(unsignedRoundsUp(rounding) && mulmod(x, y, denominator) > 0);
}
/**
* @dev Calculate the modular multiplicative inverse of a number in Z/nZ.
*
* If n is a prime, then Z/nZ is a field. In that case all elements are inversible, except 0.
* If n is not a prime, then Z/nZ is not a field, and some elements might not be inversible.
*
* If the input value is not inversible, 0 is returned.
*
* NOTE: If you know for sure that n is (big) a prime, it may be cheaper to use Fermat's little theorem and get the
* inverse using `Math.modExp(a, n - 2, n)`. See {invModPrime}.
*/
function invMod(uint256 a, uint256 n) internal pure returns (uint256) {
unchecked {
if (n == 0) return 0;
// The inverse modulo is calculated using the Extended Euclidean Algorithm (iterative version)
// Used to compute integers x and y such that: ax + ny = gcd(a, n).
// When the gcd is 1, then the inverse of a modulo n exists and it's x.
// ax + ny = 1
// ax = 1 + (-y)n
// ax ≡ 1 (mod n) # x is the inverse of a modulo n
// If the remainder is 0 the gcd is n right away.
uint256 remainder = a % n;
uint256 gcd = n;
// Therefore the initial coefficients are:
// ax + ny = gcd(a, n) = n
// 0a + 1n = n
int256 x = 0;
int256 y = 1;
while (remainder != 0) {
uint256 quotient = gcd / remainder;
(gcd, remainder) = (
// The old remainder is the next gcd to try.
remainder,
// Compute the next remainder.
// Can't overflow given that (a % gcd) * (gcd // (a % gcd)) <= gcd
// where gcd is at most n (capped to type(uint256).max)
gcd - remainder * quotient
);
(x, y) = (
// Increment the coefficient of a.
y,
// Decrement the coefficient of n.
// Can overflow, but the result is casted to uint256 so that the
// next value of y is "wrapped around" to a value between 0 and n - 1.
x - y * int256(quotient)
);
}
if (gcd != 1) return 0; // No inverse exists.
return ternary(x < 0, n - uint256(-x), uint256(x)); // Wrap the result if it's negative.
}
}
/**
* @dev Variant of {invMod}. More efficient, but only works if `p` is known to be a prime greater than `2`.
*
* From https://en.wikipedia.org/wiki/Fermat%27s_little_theorem[Fermat's little theorem], we know that if p is
* prime, then `a**(p-1) ≡ 1 mod p`. As a consequence, we have `a * a**(p-2) ≡ 1 mod p`, which means that
* `a**(p-2)` is the modular multiplicative inverse of a in Fp.
*
* NOTE: this function does NOT check that `p` is a prime greater than `2`.
*/
function invModPrime(uint256 a, uint256 p) internal view returns (uint256) {
unchecked {
return Math.modExp(a, p - 2, p);
}
}
/**
* @dev Returns the modular exponentiation of the specified base, exponent and modulus (b ** e % m)
*
* Requirements:
* - modulus can't be zero
* - underlying staticcall to precompile must succeed
*
* IMPORTANT: The result is only valid if the underlying call succeeds. When using this function, make
* sure the chain you're using it on supports the precompiled contract for modular exponentiation
* at address 0x05 as specified in https://eips.ethereum.org/EIPS/eip-198[EIP-198]. Otherwise,
* the underlying function will succeed given the lack of a revert, but the result may be incorrectly
* interpreted as 0.
*/
function modExp(uint256 b, uint256 e, uint256 m) internal view returns (uint256) {
(bool success, uint256 result) = tryModExp(b, e, m);
if (!success) {
Panic.panic(Panic.DIVISION_BY_ZERO);
}
return result;
}
/**
* @dev Returns the modular exponentiation of the specified base, exponent and modulus (b ** e % m).
* It includes a success flag indicating if the operation succeeded. Operation will be marked as failed if trying
* to operate modulo 0 or if the underlying precompile reverted.
*
* IMPORTANT: The result is only valid if the success flag is true. When using this function, make sure the chain
* you're using it on supports the precompiled contract for modular exponentiation at address 0x05 as specified in
* https://eips.ethereum.org/EIPS/eip-198[EIP-198]. Otherwise, the underlying function will succeed given the lack
* of a revert, but the result may be incorrectly interpreted as 0.
*/
function tryModExp(uint256 b, uint256 e, uint256 m) internal view returns (bool success, uint256 result) {
if (m == 0) return (false, 0);
assembly ("memory-safe") {
let ptr := mload(0x40)
// | Offset | Content | Content (Hex) |
// |-----------|------------|--------------------------------------------------------------------|
// | 0x00:0x1f | size of b | 0x0000000000000000000000000000000000000000000000000000000000000020 |
// | 0x20:0x3f | size of e | 0x0000000000000000000000000000000000000000000000000000000000000020 |
// | 0x40:0x5f | size of m | 0x0000000000000000000000000000000000000000000000000000000000000020 |
// | 0x60:0x7f | value of b | 0x<.............................................................b> |
// | 0x80:0x9f | value of e | 0x<.............................................................e> |
// | 0xa0:0xbf | value of m | 0x<.............................................................m> |
mstore(ptr, 0x20)
mstore(add(ptr, 0x20), 0x20)
mstore(add(ptr, 0x40), 0x20)
mstore(add(ptr, 0x60), b)
mstore(add(ptr, 0x80), e)
mstore(add(ptr, 0xa0), m)
// Given the result < m, it's guaranteed to fit in 32 bytes,
// so we can use the memory scratch space located at offset 0.
success := staticcall(gas(), 0x05, ptr, 0xc0, 0x00, 0x20)
result := mload(0x00)
}
}
/**
* @dev Variant of {modExp} that supports inputs of arbitrary length.
*/
function modExp(bytes memory b, bytes memory e, bytes memory m) internal view returns (bytes memory) {
(bool success, bytes memory result) = tryModExp(b, e, m);
if (!success) {
Panic.panic(Panic.DIVISION_BY_ZERO);
}
return result;
}
/**
* @dev Variant of {tryModExp} that supports inputs of arbitrary length.
*/
function tryModExp(
bytes memory b,
bytes memory e,
bytes memory m
) internal view returns (bool success, bytes memory result) {
if (_zeroBytes(m)) return (false, new bytes(0));
uint256 mLen = m.length;
// Encode call args in result and move the free memory pointer
result = abi.encodePacked(b.length, e.length, mLen, b, e, m);
assembly ("memory-safe") {
let dataPtr := add(result, 0x20)
// Write result on top of args to avoid allocating extra memory.
success := staticcall(gas(), 0x05, dataPtr, mload(result), dataPtr, mLen)
// Overwrite the length.
// result.length > returndatasize() is guaranteed because returndatasize() == m.length
mstore(result, mLen)
// Set the memory pointer after the returned data.
mstore(0x40, add(dataPtr, mLen))
}
}
/**
* @dev Returns whether the provided byte array is zero.
*/
function _zeroBytes(bytes memory byteArray) private pure returns (bool) {
for (uint256 i = 0; i < byteArray.length; ++i) {
if (byteArray[i] != 0) {
return false;
}
}
return true;
}
/**
* @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded
* towards zero.
*
* This method is based on Newton's method for computing square roots; the algorithm is restricted to only
* using integer operations.
*/
function sqrt(uint256 a) internal pure returns (uint256) {
unchecked {
// Take care of easy edge cases when a == 0 or a == 1
if (a <= 1) {
return a;
}
// In this function, we use Newton's method to get a root of `f(x) := x² - a`. It involves building a
// sequence x_n that converges toward sqrt(a). For each iteration x_n, we also define the error between
// the current value as `ε_n = | x_n - sqrt(a) |`.
//
// For our first estimation, we consider `e` the smallest power of 2 which is bigger than the square root
// of the target. (i.e. `2**(e-1) ≤ sqrt(a) < 2**e`). We know that `e ≤ 128` because `(2¹²⁸)² = 2²⁵⁶` is
// bigger than any uint256.
//
// By noticing that
// `2**(e-1) ≤ sqrt(a) < 2**e → (2**(e-1))² ≤ a < (2**e)² → 2**(2*e-2) ≤ a < 2**(2*e)`
// we can deduce that `e - 1` is `log2(a) / 2`. We can thus compute `x_n = 2**(e-1)` using a method similar
// to the msb function.
uint256 aa = a;
uint256 xn = 1;
if (aa >= (1 << 128)) {
aa >>= 128;
xn <<= 64;
}
if (aa >= (1 << 64)) {
aa >>= 64;
xn <<= 32;
}
if (aa >= (1 << 32)) {
aa >>= 32;
xn <<= 16;
}
if (aa >= (1 << 16)) {
aa >>= 16;
xn <<= 8;
}
if (aa >= (1 << 8)) {
aa >>= 8;
xn <<= 4;
}
if (aa >= (1 << 4)) {
aa >>= 4;
xn <<= 2;
}
if (aa >= (1 << 2)) {
xn <<= 1;
}
// We now have x_n such that `x_n = 2**(e-1) ≤ sqrt(a) < 2**e = 2 * x_n`. This implies ε_n ≤ 2**(e-1).
//
// We can refine our estimation by noticing that the middle of that interval minimizes the error.
// If we move x_n to equal 2**(e-1) + 2**(e-2), then we reduce the error to ε_n ≤ 2**(e-2).
// This is going to be our x_0 (and ε_0)
xn = (3 * xn) >> 1; // ε_0 := | x_0 - sqrt(a) | ≤ 2**(e-2)
// From here, Newton's method give us:
// x_{n+1} = (x_n + a / x_n) / 2
//
// One should note that:
// x_{n+1}² - a = ((x_n + a / x_n) / 2)² - a
// = ((x_n² + a) / (2 * x_n))² - a
// = (x_n⁴ + 2 * a * x_n² + a²) / (4 * x_n²) - a
// = (x_n⁴ + 2 * a * x_n² + a² - 4 * a * x_n²) / (4 * x_n²)
// = (x_n⁴ - 2 * a * x_n² + a²) / (4 * x_n²)
// = (x_n² - a)² / (2 * x_n)²
// = ((x_n² - a) / (2 * x_n))²
// ≥ 0
// Which proves that for all n ≥ 1, sqrt(a) ≤ x_n
//
// This gives us the proof of quadratic convergence of the sequence:
// ε_{n+1} = | x_{n+1} - sqrt(a) |
// = | (x_n + a / x_n) / 2 - sqrt(a) |
// = | (x_n² + a - 2*x_n*sqrt(a)) / (2 * x_n) |
// = | (x_n - sqrt(a))² / (2 * x_n) |
// = | ε_n² / (2 * x_n) |
// = ε_n² / | (2 * x_n) |
//
// For the first iteration, we have a special case where x_0 is known:
// ε_1 = ε_0² / | (2 * x_0) |
// ≤ (2**(e-2))² / (2 * (2**(e-1) + 2**(e-2)))
// ≤ 2**(2*e-4) / (3 * 2**(e-1))
// ≤ 2**(e-3) / 3
// ≤ 2**(e-3-log2(3))
// ≤ 2**(e-4.5)
//
// For the following iterations, we use the fact that, 2**(e-1) ≤ sqrt(a) ≤ x_n:
// ε_{n+1} = ε_n² / | (2 * x_n) |
// ≤ (2**(e-k))² / (2 * 2**(e-1))
// ≤ 2**(2*e-2*k) / 2**e
// ≤ 2**(e-2*k)
xn = (xn + a / xn) >> 1; // ε_1 := | x_1 - sqrt(a) | ≤ 2**(e-4.5) -- special case, see above
xn = (xn + a / xn) >> 1; // ε_2 := | x_2 - sqrt(a) | ≤ 2**(e-9) -- general case with k = 4.5
xn = (xn + a / xn) >> 1; // ε_3 := | x_3 - sqrt(a) | ≤ 2**(e-18) -- general case with k = 9
xn = (xn + a / xn) >> 1; // ε_4 := | x_4 - sqrt(a) | ≤ 2**(e-36) -- general case with k = 18
xn = (xn + a / xn) >> 1; // ε_5 := | x_5 - sqrt(a) | ≤ 2**(e-72) -- general case with k = 36
xn = (xn + a / xn) >> 1; // ε_6 := | x_6 - sqrt(a) | ≤ 2**(e-144) -- general case with k = 72
// Because e ≤ 128 (as discussed during the first estimation phase), we know have reached a precision
// ε_6 ≤ 2**(e-144) < 1. Given we're operating on integers, then we can ensure that xn is now either
// sqrt(a) or sqrt(a) + 1.
return xn - SafeCast.toUint(xn > a / xn);
}
}
/**
* @dev 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 + SafeCast.toUint(unsignedRoundsUp(rounding) && result * result < a);
}
}
/**
* @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;
uint256 exp;
unchecked {
exp = 128 * SafeCast.toUint(value > (1 << 128) - 1);
value >>= exp;
result += exp;
exp = 64 * SafeCast.toUint(value > (1 << 64) - 1);
value >>= exp;
result += exp;
exp = 32 * SafeCast.toUint(value > (1 << 32) - 1);
value >>= exp;
result += exp;
exp = 16 * SafeCast.toUint(value > (1 << 16) - 1);
value >>= exp;
result += exp;
exp = 8 * SafeCast.toUint(value > (1 << 8) - 1);
value >>= exp;
result += exp;
exp = 4 * SafeCast.toUint(value > (1 << 4) - 1);
value >>= exp;
result += exp;
exp = 2 * SafeCast.toUint(value > (1 << 2) - 1);
value >>= exp;
result += exp;
result += SafeCast.toUint(value > 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 + SafeCast.toUint(unsignedRoundsUp(rounding) && 1 << result < value);
}
}
/**
* @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 + SafeCast.toUint(unsignedRoundsUp(rounding) && 10 ** result < value);
}
}
/**
* @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;
uint256 isGt;
unchecked {
isGt = SafeCast.toUint(value > (1 << 128) - 1);
value >>= isGt * 128;
result += isGt * 16;
isGt = SafeCast.toUint(value > (1 << 64) - 1);
value >>= isGt * 64;
result += isGt * 8;
isGt = SafeCast.toUint(value > (1 << 32) - 1);
value >>= isGt * 32;
result += isGt * 4;
isGt = SafeCast.toUint(value > (1 << 16) - 1);
value >>= isGt * 16;
result += isGt * 2;
result += SafeCast.toUint(value > (1 << 8) - 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 + SafeCast.toUint(unsignedRoundsUp(rounding) && 1 << (result << 3) < value);
}
}
/**
* @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 39 of 59: contracts/WXENE.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
contract WXENE is ERC20 {
event Minted(address account, uint256 amount);
event Burnt(address account, uint256 amount);
error TransferNativeFailed();
/* *********** */
/* CONSTRUCTOR */
/* *********** */
constructor() ERC20("Wrapped XENE", "wXENE") {}
/* ****************** */
/* EXTERNAL FUNCTIONS */
/* ****************** */
/**
* @notice Mint wXENE to user
* @dev Everyone can call this function
*
* emit {Minted} event
*/
function mint() external payable {
_mint(_msgSender(), msg.value);
emit Minted(_msgSender(), msg.value);
}
/**
* @notice Mint wXENE to a specific user
* @dev Everyone can call this function
*
* emit {Minted} event
*/
function mintTo(address _receiver) external payable {
_mint(_receiver, msg.value);
emit Minted(_receiver, msg.value);
}
/**
* @notice Burn wXENE and transfer XENE to user
* @param _amount Amount of token
*
* emit {Burnt} event
*/
function burn(uint256 _amount) external {
_burn(_msgSender(), _amount);
(bool success, ) = (_msgSender()).call{value: _amount}("");
if (!success) revert TransferNativeFailed();
emit Burnt(_msgSender(), _amount);
}
}
File 40 of 59: @openzeppelin/contracts/token/ERC20/IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.20;
/**
* @dev Interface of the ERC-20 standard as defined in the ERC.
*/
interface IERC20 {
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
/**
* @dev Returns the value of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the value of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves a `value` amount of tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 value) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets a `value` amount of tokens as the allowance of `spender` over the
* caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the
* allowance mechanism. `value` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 value) external returns (bool);
}
File 41 of 59: @openzeppelin/contracts/utils/math/SignedMath.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/math/SignedMath.sol)
pragma solidity ^0.8.20;
import {SafeCast} from "./SafeCast.sol";
/**
* @dev Standard signed math utilities missing in the Solidity language.
*/
library SignedMath {
/**
* @dev Branchless ternary evaluation for `a ? b : c`. Gas costs are constant.
*
* IMPORTANT: This function may reduce bytecode size and consume less gas when used standalone.
* However, the compiler may optimize Solidity ternary operations (i.e. `a ? b : c`) to only compute
* one branch when needed, making this function more expensive.
*/
function ternary(bool condition, int256 a, int256 b) internal pure returns (int256) {
unchecked {
// branchless ternary works because:
// b ^ (a ^ b) == a
// b ^ 0 == b
return b ^ ((a ^ b) * int256(SafeCast.toUint(condition)));
}
}
/**
* @dev Returns the largest of two signed numbers.
*/
function max(int256 a, int256 b) internal pure returns (int256) {
return ternary(a > b, a, b);
}
/**
* @dev Returns the smallest of two signed numbers.
*/
function min(int256 a, int256 b) internal pure returns (int256) {
return ternary(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 {
// Formula from the "Bit Twiddling Hacks" by Sean Eron Anderson.
// Since `n` is a signed integer, the generated bytecode will use the SAR opcode to perform the right shift,
// taking advantage of the most significant (or "sign" bit) in two's complement representation.
// This opcode adds new most significant bits set to the value of the previous most significant bit. As a result,
// the mask will either be `bytes32(0)` (if n is positive) or `~bytes32(0)` (if n is negative).
int256 mask = n >> 255;
// A `bytes32(0)` mask leaves the input unchanged, while a `~bytes32(0)` mask complements it.
return uint256((n + mask) ^ mask);
}
}
}
File 42 of 59: contracts/loans/direct/DirectLoanBaseMinimal.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {IDirectLoanBase} from "./IDirectLoanBase.sol";
import {LoanData} from "./LoanData.sol";
import {LoanChecksAndCalculations} from "./LoanChecksAndCalculations.sol";
import {BaseLoan} from "../BaseLoan.sol";
import {NFTfiSigningUtils, ILendingPool} from "../utils/NFTfiSigningUtils.sol";
import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {ERC721Holder} from "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
/**
* @title DirectLoanBase
* @notice Main contract for Loan Direct Loans Type. This contract manages the ability to create NFT-backed
* peer-to-peer loans.
*
* There are two ways to commence an NFT-backed loan:
*
* a. The borrower accepts a lender's offer by calling `acceptOffer`.
* 1. the borrower calls nftContract.approveAll(Loan), approving the Loan contract to move their NFT's on their
* be1alf.
* 2. the lender calls erc20Contract.approve(Loan), allowing Loan to move the lender's ERC20 tokens on their
* behalf.
* 3. the lender signs an off-chain message, proposing its offer terms.
* 4. the borrower calls `acceptOffer` to accept these terms and enter into the loan. The NFT is stored in
* the contract, the borrower receives the loan principal in the specified ERC20 currency, the lender receives an
* Loan promissory note (in ERC721 form) that represents the rights to either the principal-plus-interest, or the
* underlying NFT collateral if the borrower does not pay back in time, and the borrower receives obligation receipt
* (in ERC721 form) that gives them the right to pay back the loan and get the collateral back.
*
* b. The lender accepts a borrowe's binding terms by calling `acceptListing`.
* 1. the borrower calls nftContract.approveAll(Loan), approving the Loan contract to move their NFT's on their
* be1alf.
* 2. the lender calls erc20Contract.approve(Loan), allowing Loan to move the lender's ERC20 tokens on their
* behalf.
* 3. the borrower signs an off-chain message, proposing its binding terms.
* 4. the lender calls `acceptListing` with an offer matching the binding terms and enter into the loan. The NFT is
* stored in the contract, the borrower receives the loan principal in the specified ERC20 currency, the lender
* receives an Loan promissory note (in ERC721 form) that represents the rights to either the principal-plus-interest,
* or the underlying NFT collateral if the borrower does not pay back in time, and the borrower receives obligation
* receipt (in ERC721 form) that gives them the right to pay back the loan and get the collateral back.
*
* The lender can freely transfer and trade this ERC721 promissory note as they wish, with the knowledge that
* transferring the ERC721 promissory note tranfsers the rights to principal-plus-interest and/or collateral, and that
* they will no longer have a claim on the loan. The ERC721 promissory note itself represents that claim.
*
* The borrower can freely transfer and trade this ERC721 obligaiton receipt as they wish, with the knowledge that
* transferring the ERC721 obligaiton receipt tranfsers the rights right to pay back the loan and get the collateral
* back.
*
* A loan may end in one of two ways:
* - First, a borrower may call Loan.payBackLoan() and pay back the loan plus interest at any time, in which case they
* receive their NFT back in the same transaction.
* - Second, if the loan's duration has passed and the loan has not been paid back yet, a lender can call
* Loan.liquidateOverdueLoan(), in which case they receive the underlying NFT collateral and forfeit the rights to the
* principal-plus-interest, which the borrower now keeps.
*
*
* If the loan was created as a ProRated type loan (pro-rata interest loan), then the user only pays the principal plus
* pro-rata interest if repaid early.
* However, if the loan was was created as a Fixed type loan (agreed to be a fixed-repayment loan), then the borrower
* pays the maximumRepaymentAmount regardless of whether they repay early or not.
*
*/
abstract contract DirectLoanBaseMinimal is IDirectLoanBase, BaseLoan, ERC721Holder, LoanData {
using SafeERC20 for IERC20;
/* ******* */
/* STORAGE */
/* ******* */
uint16 public constant HUNDRED_PERCENT = 10000;
/**
* @notice The maximum duration of any loan started for this loan type, measured in seconds. This is both a
* sanity-check for borrowers and an upper limit on how long admins will have to support v1 of this contract if they
* eventually deprecate it, as well as a check to ensure that the loan duration never exceeds the space alotted for
* it in the loan struct.
*/
uint256 public override maximumLoanDuration = 53 weeks;
/**
* @notice The percentage of interest earned by lenders on this platform that is taken by the contract admin's as a
* fee, measured in basis points (hundreths of a percent). The max allowed value is 10000.
*/
uint16 public override adminFeeInBasisPoints = 25;
/**
* @notice A mapping from a loan's identifier to the loan's details, represted by the loan struct.
*/
mapping(bytes32 => LoanTerms) public loanIdToLoan;
/**
* @notice A mapping tracking whether a loan has either been repaid or liquidated. This prevents an attacker trying
* to repay or liquidate the same loan twice.
*/
mapping(bytes32 => bool) public loanRepaidOrLiquidated;
/**
* @dev keeps track of tokens being held as loan collateral, so we dont allow these
* to be transferred with the aridrop draining functions
*/
mapping(address => mapping(uint256 => uint256)) private _escrowTokens;
/**
* @notice A mapping that takes both a user's address and a loan nonce that was first used when signing an off-chain
* order and checks whether that nonce has previously either been used for a loan, or has been pre-emptively
* cancelled. The nonce referred to here is not the same as an Ethereum account's nonce. We are referring instead to
* nonces that are used by both the lender and the borrower when they are first signing off-chain Loan orders.
*
* These nonces can be any uint256 value that the user has not previously used to sign an off-chain order. Each
* nonce can be used at most once per user within Loan, regardless of whether they are the lender or the borrower
* in that situation. This serves two purposes. First, it prevents replay attacks where an attacker would submit a
* user's off-chain order more than once. Second, it allows a user to cancel an off-chain order by calling
* Loan.cancelLoanCommitmentBeforeLoanHasBegun(), which marks the nonce as used and prevents any future loan from
* using the user's off-chain order that contains that nonce.
*/
mapping(address => mapping(uint256 => bool)) internal _nonceHasBeenUsedForUser;
/**
* @notice A mapping from an ERC20 currency address to whether that currency
* is permitted to be used by this contract.
*/
mapping(address => bool) private erc20Permits;
/**
* @notice A mapping from an NFT contract's address to the Token type of that contract. A zero Token Type indicates
* non-permitted.
*/
mapping(address => bool) private nftPermits;
/* ****** */
/* EVENTS */
/* ****** */
/**
* @notice This event is fired whenever the admins change the percent of interest rates earned that they charge as a
* fee. Note that newAdminFee can never exceed 10,000, since the fee is measured in basis points.
*
* @param newAdminFee - The new admin fee measured in basis points. This is a percent of the interest paid upon a
* loan's completion that go to the contract admins.
*/
event AdminFeeUpdated(uint16 newAdminFee);
/**
* @notice This event is fired whenever the admins change the maximum duration of any loan started for this loan
* type.
*
* @param newMaximumLoanDuration - The new maximum duration.
*/
event MaximumLoanDurationUpdated(uint256 newMaximumLoanDuration);
/**
* @notice This event is fired whenever a borrower begins a loan by calling Loan.beginLoan(), which can only occur
* after both the lender and borrower have approved their ERC721 and ERC20 contracts to use Loan, and when they
* both have signed off-chain messages that agree on the terms of the loan.
*
* @param loanId - A unique identifier for this particular loan, sourced from the Loan Coordinator.
* @param borrower - The address of the borrower.
* @param lender - The address of the lender. The lender can change their address by transferring the Loan ERC721
* token that they received when the loan began.
*/
event LoanStarted(bytes32 indexed loanId, address indexed borrower, address indexed lender, LoanTerms loanTerms);
/**
* @notice This event is fired whenever a borrower successfully repays their loan, paying
* principal-plus-interest-minus-fee to the lender in erc20Denomination, paying fee to owner in
* erc20Denomination, and receiving their NFT collateral back.
*
* @param loanId - A unique identifier for this particular loan, sourced from the Loan Coordinator.
* @param borrower - The address of the borrower.
* @param lender - The address of the lender. The lender can change their address by transferring the Loan ERC721
* token that they received when the loan began.
* @param principalAmount - The original sum of money transferred from lender to borrower at the beginning of
* the loan, measured in erc20Denomination's smallest units.
* @param nftCollateralId - The ID within the NFTCollateralContract for the NFT being used as collateral for this
* loan. The NFT is stored within this contract during the duration of the loan.
* @param amountPaidToLender - The amount of ERC20 that the borrower paid to the lender, measured in the smalled
* units of erc20Denomination.
* @param adminFee - The amount of interest paid to the contract admins, measured in the smalled units of
* erc20Denomination and determined by adminFeeInBasisPoints. This amount never exceeds the amount of interest
* earned.
* @param interest - The amount of interest paid to the lender.
* @param nftCollateralContract - The ERC721 contract of the NFT collateral
* @param erc20Denomination - The ERC20 contract of the currency being used as principal/interest for this
* loan.
*/
event LoanRepaid(
bytes32 indexed loanId,
address indexed borrower,
address indexed lender,
uint256 principalAmount,
uint256 nftCollateralId,
uint256 amountPaidToLender,
uint256 adminFee,
uint256 interest,
address nftCollateralContract,
address erc20Denomination
);
/**
* @notice This event is fired whenever a lender liquidates an outstanding loan that is owned to them that has
* exceeded its duration. The lender receives the underlying NFT collateral, and the borrower no longer needs to
* repay the loan principal-plus-interest.
*
* @param loanId - A unique identifier for this particular loan, sourced from the Loan Coordinator.
* @param borrower - The address of the borrower.
* @param lender - The address of the lender. The lender can change their address by transferring the Loan ERC721
* token that they received when the loan began.
* @param principalAmount - The original sum of money transferred from lender to borrower at the beginning of
* the loan, measured in erc20Denomination's smallest units.
* @param nftCollateralId - The ID within the NFTCollateralContract for the NFT being used as collateral for this
* loan. The NFT is stored within this contract during the duration of the loan.
* @param loanMaturityDate - The unix time (measured in seconds) that the loan became due and was eligible for
* liquidation.
* @param loanLiquidationDate - The unix time (measured in seconds) that liquidation occurred.
* @param nftCollateralContract - The ERC721 contract of the NFT collateral
*/
event LoanLiquidated(
bytes32 indexed loanId,
address indexed borrower,
address indexed lender,
uint256 principalAmount,
uint256 nftCollateralId,
uint256 loanMaturityDate,
uint256 loanLiquidationDate,
address nftCollateralContract
);
/**
* @notice This event is fired when some of the terms of a loan are being renegotiated.
*
* @param loanId - The unique identifier for the loan to be renegotiated
* @param newLoanDuration - The new amount of time (measured in seconds) that can elapse before the lender can
* liquidate the loan and seize the underlying collateral NFT.
* @param newMaximumRepaymentAmount - The new maximum amount of money that the borrower would be required to
* retrieve their collateral, measured in the smallest units of the ERC20 currency used for the loan. The
* borrower will always have to pay this amount to retrieve their collateral, regardless of whether they repay
* early.
* @param renegotiationFee Agreed upon fee in loan denomination that borrower pays for the lender for the
* renegotiation, has to be paid with an ERC20 transfer erc20Denomination token, uses transfer from,
* frontend will have to propmt an erc20 approve for this from the borrower to the lender
* @param renegotiationAdminFee renegotiationFee admin portion based on determined by adminFeeInBasisPoints
*/
event LoanRenegotiated(
bytes32 indexed loanId,
address indexed borrower,
address indexed lender,
uint32 newLoanDuration,
uint256 newMaximumRepaymentAmount,
uint256 renegotiationFee,
uint256 renegotiationAdminFee
);
/**
* @notice This event is fired whenever the admin sets a ERC20 permit.
*
* @param erc20Contract - Address of the ERC20 contract.
* @param isPermitted - Signals ERC20 permit.
*/
event ERC20Permit(address indexed erc20Contract, bool isPermitted);
/* *********** */
/* CONSTRUCTOR */
/* *********** */
/**
* @dev Sets `permittedNFTs`
*
* @param _admin - Initial admin of this contract.
* @param _permittedErc20s -
*/
constructor(address _admin, address[] memory _permittedErc20s) BaseLoan(_admin) {
for (uint256 i = 0; i < _permittedErc20s.length; i++) {
_setERC20Permit(_permittedErc20s[i], true);
}
}
/**
* @notice This function can be called by admins to change the maximumLoanDuration. Note that they can never change
* maximumLoanDuration to be greater than UINT32_MAX, since that's the maximum space alotted for the duration in the
* loan struct.
*
* @param _newMaximumLoanDuration - The new maximum loan duration, measured in seconds.
*
* emit {MaximumLoanDurationUpdated} event
*/
function updateMaximumLoanDuration(uint256 _newMaximumLoanDuration) external onlyOwner {
require(_newMaximumLoanDuration <= uint256(type(uint32).max), "Loan duration overflow");
maximumLoanDuration = _newMaximumLoanDuration;
emit MaximumLoanDurationUpdated(_newMaximumLoanDuration);
}
/**
* @notice This function can be called by admins to change the percent of interest rates earned that they charge as
* a fee. Note that newAdminFee can never exceed 10,000, since the fee is measured in basis points.
*
* @param _newAdminFeeInBasisPoints - The new admin fee measured in basis points. This is a percent of the interest
* paid upon a loan's completion that go to the contract admins.
*
* emit {AdminFeeUpdated} event
*/
function updateAdminFee(uint16 _newAdminFeeInBasisPoints) external onlyOwner {
require(_newAdminFeeInBasisPoints <= HUNDRED_PERCENT, "basis points > 10000");
adminFeeInBasisPoints = _newAdminFeeInBasisPoints;
emit AdminFeeUpdated(_newAdminFeeInBasisPoints);
}
/**
* @notice used by the owner account to be able to drain ERC20 tokens received as airdrops
* for the locked collateral NFT-s
* @param _tokenAddress - address of the token contract for the token to be sent out
* @param _receiver - receiver of the token
*/
function drainERC20Airdrop(address _tokenAddress, address _receiver) external onlyOwner {
IERC20 tokenContract = IERC20(_tokenAddress);
uint256 amount = tokenContract.balanceOf(address(this));
IERC20(_tokenAddress).safeTransfer(_receiver, amount);
}
/**
* @notice This function can be called by admins to change the permitted status of an ERC20 currency. This includes
* both adding an ERC20 currency to the permitted list and removing it.
*
* @param _erc20 - The address of the ERC20 currency whose permit list status changed.
* @param _permit - The new status of whether the currency is permitted or not.
*/
function setERC20Permit(address _erc20, bool _permit) external onlyOwner {
_setERC20Permit(_erc20, _permit);
}
/**
* @notice This function changes the permitted list status of an NFT contract. This includes both adding an NFT
* contract to the permitted list and removing it.
* @param _nftContract - The address of the NFT contract.
* @param _isPermitted - true - enable / false - disable
*/
function setNFTPermit(address _nftContract, bool _isPermitted) external onlyOwner {
require(_nftContract != address(0), "Invalid nft address");
nftPermits[_nftContract] = _isPermitted;
}
/**
* @notice used by the owner account to be able to drain ERC721 tokens received as airdrops
* for the locked collateral NFT-s
* @param _tokenAddress - address of the token contract for the token to be sent out
* @param _tokenId - id token to be sent out
* @param _receiver - receiver of the token
*/
function drainERC721Airdrop(address _tokenAddress, uint256 _tokenId, address _receiver) external onlyOwner {
require(_escrowTokens[_tokenAddress][_tokenId] == 0, "token is collateral");
IERC721(_tokenAddress).transferFrom(address(this), _receiver, _tokenId);
}
/**
* @dev makes possible to change loan duration and max repayment amount, loan duration even can be extended if
* loan was expired but not liquidated.
*
* @param _loanId - The unique identifier for the loan to be renegotiated
* @param _newLoanDuration - The new amount of time (measured in seconds) that can elapse before the lender can
* liquidate the loan and seize the underlying collateral NFT.
* @param _newMaximumRepaymentAmount - The new maximum amount of money that the borrower would be required to
* retrieve their collateral, measured in the smallest units of the ERC20 currency used for the loan. The
* borrower will always have to pay this amount to retrieve their collateral, regardless of whether they repay
* early.
* @param _renegotiationFee Agreed upon fee in ether that borrower pays for the lender for the renegitiation
* @param _signature - The components of the lender's signature.
* following combination of parameters:
* - _loanId
* - _newLoanDuration
* - _newMaximumRepaymentAmount
* - _lender
* - _expiry - The date when the renegotiation offer expires
* - address of this contract
* - chainId
*/
function renegotiateLoan(
bytes32 _loanId,
uint32 _newLoanDuration,
uint256 _newMaximumRepaymentAmount,
uint256 _renegotiationFee,
Signature calldata _signature
) external whenNotPaused nonReentrant {
_renegotiateLoan(_loanId, _newLoanDuration, _newMaximumRepaymentAmount, _renegotiationFee, _signature);
}
/**
* @notice This function is called by a anyone to repay a loan. It can be called at any time after the loan has
* begun and before loan expiry.. The caller will pay a pro-rata portion of their interest if the loan is paid off
* early and the loan is pro-rated type, but the complete repayment amount if it is fixed type.
* The the borrower (current owner of the obligation note) will get the collaterl NFT back.
*
* This function is purposefully not pausable in order to prevent an attack where the contract admin's pause the
* contract and hold hostage the NFT's that are still within it.
*
* @param _loanId A unique identifier for this particular loan, sourced from the Loan Coordinator.
*/
function payBackLoan(bytes32 _loanId) external whenNotPaused nonReentrant {
LoanChecksAndCalculations.payBackChecks(_loanId);
(address borrower, address lender, LoanTerms memory loan) = _getPartiesAndData(_loanId);
_payBackLoan(_loanId, borrower, lender, loan);
_resolveLoan(_loanId, borrower, loan);
// Delete the loan from storage in order to achieve a substantial gas savings and to lessen the burden of
// storage on Ethereum nodes, since we will never access this loan's details again, and the details are still
// available through event data.
delete loanIdToLoan[_loanId];
}
/**
* @notice This function is called by a lender once a loan has finished its duration and the borrower still has not
* repaid. The lender can call this function to seize the underlying NFT collateral, although the lender gives up
* all rights to the principal-plus-collateral by doing so.
*
* This function is purposefully not pausable in order to prevent an attack where the contract admin's pause
* the contract and hold hostage the NFT's that are still within it.
*
* We intentionally allow anybody to call this function, although only the lender will end up receiving the seized
* collateral. We are exploring the possbility of incentivizing users to call this function by using some of the
* admin funds.
*
* @param _loanId A unique identifier for this particular loan, sourced from the Loan Coordinator.
*
* emit {LoanLiquidated} event
*/
function liquidateOverdueLoan(bytes32 _loanId) external whenNotPaused nonReentrant {
// Sanity check that payBackLoan() and liquidateOverdueLoan() have never been called on this loanId.
// Depending on how the rest of the code turns out, this check may be unnecessary.
LoanChecksAndCalculations.checkLoanIdValidity(_loanId);
(address borrower, address lender, LoanTerms memory loan) = _getPartiesAndData(_loanId);
// Ensure that the loan is indeed overdue, since we can only liquidate overdue loans.
uint256 loanMaturityDate = uint256(loan.loanStartTime) + uint256(loan.duration);
require(block.timestamp > loanMaturityDate, "Loan is not overdue yet");
if (loan.useLendingPool) {
require(ILendingPool(lender).isAdmin(msg.sender), "Only Lending pool admin can liquidate");
} else {
require(msg.sender == lender, "Only lender can liquidate");
}
_resolveLoan(_loanId, lender, loan);
// Emit an event with all relevant details from this transaction.
emit LoanLiquidated(_loanId, borrower, lender, loan.principalAmount, loan.nftCollateralId, loanMaturityDate, block.timestamp, loan.nftCollateralContract);
// Delete the loan from storage in order to achieve a substantial gas savings and to lessen the burden of
// storage on Ethereum nodes, since we will never access this loan's details again, and the details are still
// available through event data.
delete loanIdToLoan[_loanId];
}
/**
* @notice This function can be called by either a lender or a borrower to cancel all off-chain orders that they
* have signed that contain this nonce. If the off-chain orders were created correctly, there should only be one
* off-chain order that contains this nonce at all.
*
* The nonce referred to here is not the same as an Ethereum account's nonce. We are referring
* instead to nonces that are used by both the lender and the borrower when they are first signing off-chain Loan
* orders. These nonces can be any uint256 value that the user has not previously used to sign an off-chain order.
* Each nonce can be used at most once per user within Loan, regardless of whether they are the lender or the
* borrower in that situation. This serves two purposes. First, it prevents replay attacks where an attacker would
* submit a user's off-chain order more than once. Second, it allows a user to cancel an off-chain order by calling
* Loan.cancelLoanCommitmentBeforeLoanHasBegun(), which marks the nonce as used and prevents any future loan from
* using the user's off-chain order that contains that nonce.
*
* @param _nonce - User nonce
*/
function cancelLoanCommitmentBeforeLoanHasBegun(uint256 _nonce) external whenNotPaused {
require(!_nonceHasBeenUsedForUser[msg.sender][_nonce], "Invalid nonce");
_nonceHasBeenUsedForUser[msg.sender][_nonce] = true;
}
/* ******************* */
/* READ-ONLY FUNCTIONS */
/* ******************* */
/**
* @notice This function can be used to view whether a particular nonce for a particular user has already been used,
* either from a successful loan or a cancelled off-chain order.
*
* @param _user - The address of the user. This function works for both lenders and borrowers alike.
* @param _nonce - The nonce referred to here is not the same as an Ethereum account's nonce. We are referring
* instead to nonces that are used by both the lender and the borrower when they are first signing off-chain
* Loan orders. These nonces can be any uint256 value that the user has not previously used to sign an off-chain
* order. Each nonce can be used at most once per user within Loan, regardless of whether they are the lender or
* the borrower in that situation. This serves two purposes:
* - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
* - Second, it allows a user to cancel an off-chain order by calling Loan.cancelLoanCommitmentBeforeLoanHasBegun()
* , which marks the nonce as used and prevents any future loan from using the user's off-chain order that contains
* that nonce.
*
* @return A bool representing whether or not this nonce has been used for this user.
*/
function getWhetherNonceHasBeenUsedForUser(address _user, uint256 _nonce) external view override returns (bool) {
return _nonceHasBeenUsedForUser[_user][_nonce];
}
/**
* @notice This function can be called by anyone to get the permit associated with the erc20 contract.
*
* @param _erc20 - The address of the erc20 contract.
*
* @return Returns whether the erc20 is permitted
*/
function getERC20Permit(address _erc20) public view returns (bool) {
return erc20Permits[_erc20];
}
/**
* @notice This function can be called by anyone to get the permit associated with the erc20 contract.
*
* @param _nftContract - The address of the NFT contract.
*
* @return Returns whether the erc20 is permitted
*/
function getNftPermit(address _nftContract) public view returns (bool) {
return nftPermits[_nftContract];
}
/* ****************** */
/* INTERNAL FUNCTIONS */
/* ****************** */
/**
* @dev makes possible to change loan duration and max repayment amount, loan duration even can be extended if
* loan was expired but not liquidated. IMPORTANT: Frontend will have to propt the caller to do an ERC20 approve for
* the fee amount from themselves (borrower/obligation reciept holder) to the lender (promissory note holder)
*
* @param _loanId - The unique identifier for the loan to be renegotiated
* @param _newLoanDuration - The new amount of time (measured in seconds) that can elapse before the lender can
* liquidate the loan and seize the underlying collateral NFT.
* @param _newMaximumRepaymentAmount - The new maximum amount of money that the borrower would be required to
* retrieve their collateral, measured in the smallest units of the ERC20 currency used for the loan. The
* borrower will always have to pay this amount to retrieve their collateral, regardless of whether they repay
* early.
* @param _renegotiationFee Agreed upon fee in loan denomination that borrower pays for the lender and
* the admin for the renegotiation, has to be paid with an ERC20 transfer erc20Denomination token,
* uses transfer from, frontend will have to propmt an erc20 approve for this from the borrower to the lender,
* admin fee is calculated by the loan's adminFeeInBasisPoints value
* @param _signature - The components of the lender's signature.
* following combination of parameters:
* - _loanId
* - _newLoanDuration
* - _newMaximumRepaymentAmount
* - _lender
* - _expiry - The date when the renegotiation offer expires
* - address of this contract
* - chainId
*
* emit {LoanRenegotiated} event
*/
function _renegotiateLoan(
bytes32 _loanId,
uint32 _newLoanDuration,
uint256 _newMaximumRepaymentAmount,
uint256 _renegotiationFee,
Signature calldata _signature
) internal {
LoanTerms storage loan = loanIdToLoan[_loanId];
(address borrower, address lender) = LoanChecksAndCalculations.renegotiationChecks(loan, _loanId, _newLoanDuration, _newMaximumRepaymentAmount, _signature.nonce);
_nonceHasBeenUsedForUser[lender][_signature.nonce] = true;
require(
NFTfiSigningUtils.isValidLenderRenegotiationSignature(
_loanId,
_newLoanDuration,
_newMaximumRepaymentAmount,
_renegotiationFee,
loan,
_signature
),
"Renegotiation signature is invalid"
);
uint256 renegotiationAdminFee = 0;
/**
* @notice Transfers fee to the lender immediately
* @dev implements Checks-Effects-Interactions pattern by modifying state only after
* the transfer happened successfully, we also add the nonReentrant modifier to
* the pbulic versions
*/
if (_renegotiationFee > 0) {
renegotiationAdminFee = LoanChecksAndCalculations.computeAdminFee(_renegotiationFee, loan.adminFeeInBasisPoints);
// Transfer principal-plus-interest-minus-fees from the caller (always has to be borrower) to lender
IERC20(loan.erc20Denomination).safeTransferFrom(borrower, lender, _renegotiationFee - renegotiationAdminFee);
// Transfer fees from the caller (always has to be borrower) to admins
IERC20(loan.erc20Denomination).safeTransferFrom(borrower, owner(), renegotiationAdminFee);
}
loan.duration = _newLoanDuration;
loan.maximumRepaymentAmount = _newMaximumRepaymentAmount;
emit LoanRenegotiated(_loanId, borrower, lender, _newLoanDuration, _newMaximumRepaymentAmount, _renegotiationFee, renegotiationAdminFee);
}
/**
* @dev Transfer collateral NFT from borrower to this contract and principal from lender to the borrower and
* registers the new loan through the loan coordinator.
*
* @param _loanTerms - Struct containing the loan's settings
* @param _lender - The address of the lender.
* that there is no referrer.
*/
function _createLoan(bytes32 _loanId, LoanTerms memory _loanTerms, address _borrower, address _lender) internal {
// Transfer collateral from borrower to this contract to be held until
// loan completion.
_transferNFT(_loanTerms, _borrower, address(this));
_createLoanNoNftTransfer(_loanId, _loanTerms, _borrower, _lender);
}
/**
* @dev Transfer principal from lender to the borrower and
* registers the new loan through the loan coordinator.
*
* @param _loanTerms - Struct containing the loan's settings
* @param _lender - The address of the lender.
* that there is no referrer.
*/
function _createLoanNoNftTransfer(bytes32 _loanId, LoanTerms memory _loanTerms, address _borrower, address _lender) internal {
_escrowTokens[_loanTerms.nftCollateralContract][_loanTerms.nftCollateralId] += 1;
// Transfer principal from lender to borrower.
if (_loanTerms.useLendingPool) {
ILendingPool(_loanTerms.lender).informDisburse(_loanTerms.erc20Denomination, _borrower, _loanTerms.principalAmount);
} else {
IERC20(_loanTerms.erc20Denomination).safeTransferFrom(_lender, _borrower, _loanTerms.principalAmount);
}
// Add the loan to storage before moving collateral/principal to follow
// the Checks-Effects-Interactions pattern.
loanIdToLoan[_loanId] = _loanTerms;
}
/**
* @dev Transfers several types of NFTs using a wrapper that knows how to handle each case.
*
* @param _loanTerms - Struct containing all the loan's parameters
* @param _sender - Current owner of the NFT
* @param _recipient - Recipient of the transfer
*/
function _transferNFT(LoanTerms memory _loanTerms, address _sender, address _recipient) internal {
IERC721(_loanTerms.nftCollateralContract).safeTransferFrom(_sender, _recipient, _loanTerms.nftCollateralId, "");
}
/**
* @notice This function is called by a anyone to repay a loan. It can be called at any time after the loan has
* begun and before loan expiry.. The caller will pay a pro-rata portion of their interest if the loan is paid off
* early and the loan is pro-rated type, but the complete repayment amount if it is fixed type.
* The the borrower (current owner of the obligation note) will get the collaterl NFT back.
*
* This function is purposefully not pausable in order to prevent an attack where the contract admin's pause the
* contract and hold hostage the NFT's that are still within it.
*
* @param _loanId A unique identifier for this particular loan, sourced from the Loan Coordinator.
*
* emit {LoanRepaid} event
*/
function _payBackLoan(bytes32 _loanId, address _borrower, address _lender, LoanTerms memory _loan) internal {
(uint256 adminFee, uint256 payoffAmount) = _payoffAndFee(_loan);
// Transfer principal-plus-interest-minus-fees from the caller to lender
IERC20(_loan.erc20Denomination).safeTransferFrom(msg.sender, _lender, payoffAmount);
if (_loan.useLendingPool) {
ILendingPool(_lender).informPayBack(_loan.erc20Denomination, _loan.principalAmount);
}
// Transfer fees from the caller to admins
IERC20(_loan.erc20Denomination).safeTransferFrom(msg.sender, owner(), adminFee);
// Emit an event with all relevant details from this transaction.
emit LoanRepaid(
_loanId,
_borrower,
_lender,
_loan.principalAmount,
_loan.nftCollateralId,
payoffAmount,
adminFee,
payoffAmount - _loan.principalAmount,
_loan.nftCollateralContract,
_loan.erc20Denomination
);
}
/**
* @notice A convenience function with shared functionality between `payBackLoan` and `liquidateOverdueLoan`.
*
* @param _loanId A unique identifier for this particular loan, sourced from the Loan Coordinator.
* @param _nftReceiver - The receiver of the collateral nft. The borrower when `payBackLoan` or the lender when
* `liquidateOverdueLoan`.
* @param _loanTerms - The main Loan Terms struct. This data is saved upon loan creation on loanIdToLoan.
*/
function _resolveLoan(bytes32 _loanId, address _nftReceiver, LoanTerms memory _loanTerms) internal {
_resolveLoanNoNftTransfer(_loanId, _loanTerms);
// Transfer collateral from this contract to the lender, since the lender is seizing collateral for an overdue
// loan
_transferNFT(_loanTerms, address(this), _nftReceiver);
}
/**
* @notice Resolving the loan without trasferring the nft to provide a base for the bundle
* break up of the bundled loans
*
* @param _loanId A unique identifier for this particular loan, sourced from the Loan Coordinator.
* @param _loanTerms - The main Loan Terms struct. This data is saved upon loan creation on loanIdToLoan.
*/
function _resolveLoanNoNftTransfer(bytes32 _loanId, LoanTerms memory _loanTerms) internal {
// Mark loan as liquidated before doing any external transfers to follow the Checks-Effects-Interactions design
// pattern
loanRepaidOrLiquidated[_loanId] = true;
_escrowTokens[_loanTerms.nftCollateralContract][_loanTerms.nftCollateralId] -= 1;
}
/**
* @notice This function can be called by admins to change the permitted status of an ERC20 currency. This includes
* both adding an ERC20 currency to the permitted list and removing it.
*
* @param _erc20 - The address of the ERC20 currency whose permit list status changed.
* @param _permit - The new status of whether the currency is permitted or not.
*
* emit {ERC20Permit} event
*/
function _setERC20Permit(address _erc20, bool _permit) internal {
require(_erc20 != address(0), "erc20 is zero address");
erc20Permits[_erc20] = _permit;
emit ERC20Permit(_erc20, _permit);
}
/**
* @dev Performs some validation checks over loan parameters
*
*/
function _loanSanityChecks(Offer memory _offer) internal view {
require(getERC20Permit(_offer.erc20Denomination), "Currency denomination is not permitted");
require(nftPermits[_offer.nftCollateralContract], "NFT collateral contract is not permitted");
require(uint256(_offer.duration) <= maximumLoanDuration, "Loan duration exceeds maximum loan duration");
require(uint256(_offer.duration) != 0, "Loan duration cannot be zero");
require(_offer.adminFeeInBasisPoints == adminFeeInBasisPoints, "The admin fee has changed since this order was signed.");
}
/**
* @dev reads some variable values of a loan for payback functions, created to reduce code repetition
*/
function _getPartiesAndData(bytes32 _loanId) internal view returns (address borrower, address lender, LoanTerms memory loan) {
// Fetch loan details from storage, but store them in memory for the sake of saving gas.
loan = loanIdToLoan[_loanId];
borrower = loan.borrower;
lender = loan.lender;
}
/**
* @dev Calculates the payoff amount and admin fee
*/
function _payoffAndFee(LoanTerms memory _loanTerms) internal view virtual returns (uint256, uint256);
/**
* @dev Check valid loan ID
*/
function isValidLoanId(bytes32 _loanId) public view returns (bool) {
return loanIdToLoan[_loanId].borrower != address(0);
}
}
File 43 of 59: contracts/loans/utils/NFTfiSigningUtilsContract.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {NFTfiSigningUtils, LoanData} from "./NFTfiSigningUtils.sol";
/**
* @title NFTfiSigningUtilsContract
* @notice Helper contract for Loan. This contract manages externally verifying signatures from off-chain Loan orders.
*/
contract NFTfiSigningUtilsContract {
/* ********* */
/* FUNCTIONS */
/* ********* */
/**
* @notice This function is when the borrower accepts a lender's offer, to validate the lender's signature that the
* lender provided off-chain to verify that it did indeed made such offer.
*
* @param _offer - The offer struct containing:
* - erc20Denomination: The address of the ERC20 contract of the currency being used as principal/interest
* for this loan.
* - principalAmount: The original sum of money transferred from lender to borrower at the beginning of
* the loan, measured in erc20Denomination's smallest units.
* - maximumRepaymentAmount: The maximum amount of money that the borrower would be required to retrieve their
* collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
* to pay this amount to retrieve their collateral, regardless of whether they repay early.
* - nftCollateralContract: The address of the ERC721 contract of the NFT collateral.
* - nftCollateralId: The ID within the NFTCollateralContract for the NFT being used as collateral for this
* loan. The NFT is stored within this contract during the duration of the loan.
* - referrer: The address of the referrer who found the lender matching the listing, Zero address to signal
* this there is no referrer.
* - duration: The amount of time (measured in seconds) that can elapse before the lender can liquidate the
* loan and seize the underlying collateral NFT.
* - adminFeeInBasisPoints: The percent (measured in basis points) of the interest earned that will be
* taken as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
* attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
* earned.
* @param _signature - The signature structure containing:
* - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
* - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
* We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
* off-chain Loan orders. These nonce can be any uint256 value that the user has not previously used to sign an
* off-chain order. Each nonce can be used at most once per user within Loan, regardless of whether they are the
* lender or the borrower in that situation. This serves two purposes:
* - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
* - Second, it allows a user to cancel an off-chain order by calling
* Loan.cancelLoanCommitmentBeforeLoanHasBegun(), which marks the nonce as used and prevents any future loan from
* using the user's off-chain order that contains that nonce.
* - expiry: Date when the signature expires
* - signature: The ECDSA signature of the lender, obtained off-chain ahead of time, signing the following
* combination of parameters:
* - offer.erc20Denomination
* - offer.principalAmount
* - offer.maximumRepaymentAmount
* - offer.nftCollateralContract
* - offer.nftCollateralId
* - offer.duration
* - offer.adminFeeInBasisPoints
* - signature.signer,
* - signature.nonce,
* - signature.expiry,
* - loan contract address,
* - chainId
* @param _loanContract - Address of the loan contract where the signature is going to be used
*/
function isValidLenderSignature(
LoanData.Offer memory _offer,
LoanData.Signature memory _signature,
address _loanContract
) external view returns (bool) {
return NFTfiSigningUtils.isValidLenderSignature(_offer, _signature, _loanContract);
}
/**
* @notice This function is called in renegotiateLoan() to validate the lender's signature that the lender provided
* off-chain to verify that they did indeed want to agree to this loan renegotiation according to these terms.
*
* @param _loanId - The unique identifier for the loan to be renegotiated
* @param _newLoanDuration - The new amount of time (measured in seconds) that can elapse before the lender can
* liquidate the loan and seize the underlying collateral NFT.
* @param _newMaximumRepaymentAmount - The new maximum amount of money that the borrower would be required to
* retrieve their collateral, measured in the smallest units of the ERC20 currency used for the loan. The
* borrower will always have to pay this amount to retrieve their collateral, regardless of whether they repay
* early.
* @param _renegotiationFee Agreed upon fee in ether that borrower pays for the lender for the renegitiation
* @param _loan The current loan data
* @param _signature - The signature structure containing:
* - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
* - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
* We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
* off-chain Loan orders. These nonce can be any uint256 value that the user has not previously used to sign an
* off-chain order. Each nonce can be used at most once per user within Loan, regardless of whether they are the
* lender or the borrower in that situation. This serves two purposes:
* - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
* - Second, it allows a user to cancel an off-chain order by calling Loan.cancelLoanCommitmentBeforeLoanHasBegun()
* , which marks the nonce as used and prevents any future loan from using the user's off-chain order that contains
* that nonce.
* - expiry - The date when the renegotiation offer expires
* - lenderSignature - The ECDSA signature of the lender, obtained off-chain ahead of time, signing the
* following combination of parameters:
* - _loanId
* - _newLoanDuration
* - _newMaximumRepaymentAmount
* - _lender
* - _lenderNonce
* - _expiry
* - loan contract address,
* - chainId
* @param _loanContract - Address of the loan contract where the signature is going to be used
*/
function isValidLenderRenegotiationSignature(
bytes32 _loanId,
uint32 _newLoanDuration,
uint256 _newMaximumRepaymentAmount,
uint256 _renegotiationFee,
LoanData.LoanTerms memory _loan,
LoanData.Signature memory _signature,
address _loanContract
) external view returns (bool) {
return
NFTfiSigningUtils.isValidLenderRenegotiationSignature(
_loanId,
_newLoanDuration,
_newMaximumRepaymentAmount,
_renegotiationFee,
_loan,
_signature,
_loanContract
);
}
}
File 44 of 59: @openzeppelin/contracts/utils/Pausable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Pausable.sol)
pragma solidity ^0.8.20;
import {Context} from "../utils/Context.sol";
/**
* @dev Contract module which allows children to implement an emergency stop
* mechanism that can be triggered by an authorized account.
*
* This module is used through inheritance. It will make available the
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to
* the functions of your contract. Note that they will not be pausable by
* simply including this module, only once the modifiers are put in place.
*/
abstract contract Pausable is Context {
bool private _paused;
/**
* @dev Emitted when the pause is triggered by `account`.
*/
event Paused(address account);
/**
* @dev Emitted when the pause is lifted by `account`.
*/
event Unpaused(address account);
/**
* @dev The operation failed because the contract is paused.
*/
error EnforcedPause();
/**
* @dev The operation failed because the contract is not paused.
*/
error ExpectedPause();
/**
* @dev Initializes the contract in unpaused state.
*/
constructor() {
_paused = false;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
_requireNotPaused();
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
_requirePaused();
_;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view virtual returns (bool) {
return _paused;
}
/**
* @dev Throws if the contract is paused.
*/
function _requireNotPaused() internal view virtual {
if (paused()) {
revert EnforcedPause();
}
}
/**
* @dev Throws if the contract is not paused.
*/
function _requirePaused() internal view virtual {
if (!paused()) {
revert ExpectedPause();
}
}
/**
* @dev Triggers stopped state.
*
* Requirements:
*
* - The contract must not be paused.
*/
function _pause() internal virtual whenNotPaused {
_paused = true;
emit Paused(_msgSender());
}
/**
* @dev Returns to normal state.
*
* Requirements:
*
* - The contract must be paused.
*/
function _unpause() internal virtual whenPaused {
_paused = false;
emit Unpaused(_msgSender());
}
}
File 45 of 59: @openzeppelin/contracts/token/ERC20/ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.2.0) (token/ERC20/ERC20.sol)
pragma solidity ^0.8.20;
import {IERC20} from "./IERC20.sol";
import {IERC20Metadata} from "./extensions/IERC20Metadata.sol";
import {Context} from "../../utils/Context.sol";
import {IERC20Errors} from "../../interfaces/draft-IERC6093.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
*
* TIP: For a detailed writeup see our guide
* https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* The default value of {decimals} is 18. To change this, you should override
* this function so it returns a different value.
*
* We have followed general OpenZeppelin Contracts guidelines: functions revert
* instead returning `false` on failure. This behavior is nonetheless
* conventional and does not conflict with the expectations of ERC-20
* applications.
*/
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
mapping(address account => uint256) private _balances;
mapping(address account => mapping(address spender => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the default value returned by this function, unless
* it's overridden.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `value`.
*/
function transfer(address to, uint256 value) public virtual returns (bool) {
address owner = _msgSender();
_transfer(owner, to, value);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* NOTE: If `value` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 value) public virtual returns (bool) {
address owner = _msgSender();
_approve(owner, spender, value);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Skips emitting an {Approval} event indicating an allowance update. This is not
* required by the ERC. See {xref-ERC20-_approve-address-address-uint256-bool-}[_approve].
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `value`.
* - the caller must have allowance for ``from``'s tokens of at least
* `value`.
*/
function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, value);
_transfer(from, to, value);
return true;
}
/**
* @dev Moves a `value` amount of tokens from `from` to `to`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* NOTE: This function is not virtual, {_update} should be overridden instead.
*/
function _transfer(address from, address to, uint256 value) internal {
if (from == address(0)) {
revert ERC20InvalidSender(address(0));
}
if (to == address(0)) {
revert ERC20InvalidReceiver(address(0));
}
_update(from, to, value);
}
/**
* @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
* (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
* this function.
*
* Emits a {Transfer} event.
*/
function _update(address from, address to, uint256 value) internal virtual {
if (from == address(0)) {
// Overflow check required: The rest of the code assumes that totalSupply never overflows
_totalSupply += value;
} else {
uint256 fromBalance = _balances[from];
if (fromBalance < value) {
revert ERC20InsufficientBalance(from, fromBalance, value);
}
unchecked {
// Overflow not possible: value <= fromBalance <= totalSupply.
_balances[from] = fromBalance - value;
}
}
if (to == address(0)) {
unchecked {
// Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
_totalSupply -= value;
}
} else {
unchecked {
// Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
_balances[to] += value;
}
}
emit Transfer(from, to, value);
}
/**
* @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
* Relies on the `_update` mechanism
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* NOTE: This function is not virtual, {_update} should be overridden instead.
*/
function _mint(address account, uint256 value) internal {
if (account == address(0)) {
revert ERC20InvalidReceiver(address(0));
}
_update(address(0), account, value);
}
/**
* @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
* Relies on the `_update` mechanism.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* NOTE: This function is not virtual, {_update} should be overridden instead
*/
function _burn(address account, uint256 value) internal {
if (account == address(0)) {
revert ERC20InvalidSender(address(0));
}
_update(account, address(0), value);
}
/**
* @dev Sets `value` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*
* Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
*/
function _approve(address owner, address spender, uint256 value) internal {
_approve(owner, spender, value, true);
}
/**
* @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
*
* By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
* `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
* `Approval` event during `transferFrom` operations.
*
* Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
* true using the following override:
*
* ```solidity
* function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
* super._approve(owner, spender, value, true);
* }
* ```
*
* Requirements are the same as {_approve}.
*/
function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
if (owner == address(0)) {
revert ERC20InvalidApprover(address(0));
}
if (spender == address(0)) {
revert ERC20InvalidSpender(address(0));
}
_allowances[owner][spender] = value;
if (emitEvent) {
emit Approval(owner, spender, value);
}
}
/**
* @dev Updates `owner` s allowance for `spender` based on spent `value`.
*
* Does not update the allowance value in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Does not emit an {Approval} event.
*/
function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance < type(uint256).max) {
if (currentAllowance < value) {
revert ERC20InsufficientAllowance(spender, currentAllowance, value);
}
unchecked {
_approve(owner, spender, currentAllowance - value, false);
}
}
}
}
File 46 of 59: contracts/utils/TransferHelper.sol
// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.28;
library TransferHelper {
error TransferNativeFailed();
/// @notice Transfers Native token to the recipient address
/// @dev Fails with error `TransferNativeFailed`
/// @param to The destination of the transfer
/// @param value The value to be transferred
function safeTransferNative(address to, uint256 value) internal {
(bool success, ) = to.call{value: value}(new bytes(0));
if (!success) {
revert TransferNativeFailed();
}
}
}
File 47 of 59: @openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/utils/ERC721Holder.sol)
pragma solidity ^0.8.20;
import {IERC721Receiver} from "../IERC721Receiver.sol";
/**
* @dev Implementation of the {IERC721Receiver} interface.
*
* Accepts all token transfers.
* Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or
* {IERC721-setApprovalForAll}.
*/
abstract contract ERC721Holder is IERC721Receiver {
/**
* @dev See {IERC721Receiver-onERC721Received}.
*
* Always returns `IERC721Receiver.onERC721Received.selector`.
*/
function onERC721Received(address, address, uint256, bytes memory) public virtual returns (bytes4) {
return this.onERC721Received.selector;
}
}
File 48 of 59: @openzeppelin/contracts/utils/structs/EnumerableSet.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.
pragma solidity ^0.8.20;
/**
* @dev Library for managing
* https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
* types.
*
* Sets have the following properties:
*
* - Elements are added, removed, and checked for existence in constant time
* (O(1)).
* - Elements are enumerated in O(n). No guarantees are made on the ordering.
*
* ```solidity
* contract Example {
* // Add the library methods
* using EnumerableSet for EnumerableSet.AddressSet;
*
* // Declare a set state variable
* EnumerableSet.AddressSet private mySet;
* }
* ```
*
* As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
* and `uint256` (`UintSet`) are supported.
*
* [WARNING]
* ====
* Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
* unusable.
* See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
*
* In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
* array of EnumerableSet.
* ====
*/
library EnumerableSet {
// To implement this library for multiple types with as little code
// repetition as possible, we write it in terms of a generic Set type with
// bytes32 values.
// The Set implementation uses private functions, and user-facing
// implementations (such as AddressSet) are just wrappers around the
// underlying Set.
// This means that we can only create new EnumerableSets for types that fit
// in bytes32.
struct Set {
// Storage of set values
bytes32[] _values;
// Position is the index of the value in the `values` array plus 1.
// Position 0 is used to mean a value is not in the set.
mapping(bytes32 value => uint256) _positions;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function _add(Set storage set, bytes32 value) private returns (bool) {
if (!_contains(set, value)) {
set._values.push(value);
// The value is stored at length-1, but we add 1 to all indexes
// and use 0 as a sentinel value
set._positions[value] = set._values.length;
return true;
} else {
return false;
}
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function _remove(Set storage set, bytes32 value) private returns (bool) {
// We cache the value's position to prevent multiple reads from the same storage slot
uint256 position = set._positions[value];
if (position != 0) {
// Equivalent to contains(set, value)
// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
// the array, and then remove the last element (sometimes called as 'swap and pop').
// This modifies the order of the array, as noted in {at}.
uint256 valueIndex = position - 1;
uint256 lastIndex = set._values.length - 1;
if (valueIndex != lastIndex) {
bytes32 lastValue = set._values[lastIndex];
// Move the lastValue to the index where the value to delete is
set._values[valueIndex] = lastValue;
// Update the tracked position of the lastValue (that was just moved)
set._positions[lastValue] = position;
}
// Delete the slot where the moved value was stored
set._values.pop();
// Delete the tracked position for the deleted slot
delete set._positions[value];
return true;
} else {
return false;
}
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function _contains(Set storage set, bytes32 value) private view returns (bool) {
return set._positions[value] != 0;
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function _length(Set storage set) private view returns (uint256) {
return set._values.length;
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function _at(Set storage set, uint256 index) private view returns (bytes32) {
return set._values[index];
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function _values(Set storage set) private view returns (bytes32[] memory) {
return set._values;
}
// Bytes32Set
struct Bytes32Set {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
return _add(set._inner, value);
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
return _remove(set._inner, value);
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
return _contains(set._inner, value);
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(Bytes32Set storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
return _at(set._inner, index);
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
bytes32[] memory store = _values(set._inner);
bytes32[] memory result;
assembly ("memory-safe") {
result := store
}
return result;
}
// AddressSet
struct AddressSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(AddressSet storage set, address value) internal returns (bool) {
return _add(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(AddressSet storage set, address value) internal returns (bool) {
return _remove(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(AddressSet storage set, address value) internal view returns (bool) {
return _contains(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(AddressSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(AddressSet storage set, uint256 index) internal view returns (address) {
return address(uint160(uint256(_at(set._inner, index))));
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(AddressSet storage set) internal view returns (address[] memory) {
bytes32[] memory store = _values(set._inner);
address[] memory result;
assembly ("memory-safe") {
result := store
}
return result;
}
// UintSet
struct UintSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(UintSet storage set, uint256 value) internal returns (bool) {
return _add(set._inner, bytes32(value));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(UintSet storage set, uint256 value) internal returns (bool) {
return _remove(set._inner, bytes32(value));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(UintSet storage set, uint256 value) internal view returns (bool) {
return _contains(set._inner, bytes32(value));
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(UintSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(UintSet storage set, uint256 index) internal view returns (uint256) {
return uint256(_at(set._inner, index));
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(UintSet storage set) internal view returns (uint256[] memory) {
bytes32[] memory store = _values(set._inner);
uint256[] memory result;
assembly ("memory-safe") {
result := store
}
return result;
}
}
File 49 of 59: contracts/Marketplace/Marketplace.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import {ERC721Holder} from "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";
import {SafeERC20, IERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {TransferHelper} from "../utils/TransferHelper.sol";
import {Permission, Ownable} from "../utils/Permission.sol";
import {IMarketplace} from "./IMarketplace.sol";
contract Marketplace is IMarketplace, Permission, ReentrancyGuard, ERC721Holder {
using SafeERC20 for IERC20;
address public feeReceiver;
uint256 public feePercent;
uint256 public itemCount;
// Permitted payments token for marketplace
mapping(address => bool) public paymentToken;
struct Item {
uint256 itemId;
address nft;
uint256 tokenId;
uint256 price;
address paymentToken;
address seller;
address beneficiary;
ItemStatus status;
}
// Market item info mapped by item id
mapping(uint256 => Item) public items;
event MakeItem(uint256 indexed itemId, Item item);
event BoughtItem(uint256 indexed itemId, address indexed buyer);
event ClosedItem(uint256 indexed itemId);
event SetPaymentToken(address indexed token, bool allow);
event SetFeeReceiver(address indexed oldValue, address indexed newValue);
event SetFeePercent(uint256 indexed oldValue, uint256 indexed newValue);
constructor(address _initialOwner, address _feeReceiver, uint256 _feePercent) Ownable(_initialOwner) {
feeReceiver = _feeReceiver;
feePercent = _feePercent;
}
function makeItem(address _nft, uint256 _tokenId, address _paymentToken, uint256 _price, address _beneficiary) external {
if (_nft == address(0)) revert InvalidNft();
if (!paymentToken[_paymentToken]) revert NotPermittedToken();
if (_price == 0) revert InvalidPrice();
if (_beneficiary == address(0)) revert InvalidBeneficiary();
itemCount++;
items[itemCount] = Item(itemCount, _nft, _tokenId, _price, _paymentToken, _msgSender(), _beneficiary, ItemStatus.OPENING);
IERC721(_nft).transferFrom(_msgSender(), address(this), _tokenId);
emit MakeItem(itemCount, items[itemCount]);
}
function purchaseItem(uint256 _itemId) external payable nonReentrant {
Item storage item = items[_itemId];
if (item.itemId == 0) revert NotExistedItem();
if (item.status != ItemStatus.OPENING) revert NotOpeningItem();
item.status = ItemStatus.SOLD;
// transfer sold token to beneficiary address
uint256 marketFee = (item.price * feePercent) / 10000;
uint256 receivedAmount = item.price - marketFee;
if (item.paymentToken == address(0)) {
if (msg.value != item.price) revert NotEnougnETH();
if (marketFee > 0) {
TransferHelper.safeTransferNative(feeReceiver, marketFee);
}
TransferHelper.safeTransferNative(item.beneficiary, receivedAmount);
} else {
if (marketFee > 0) {
IERC20(item.paymentToken).safeTransferFrom(_msgSender(), feeReceiver, marketFee);
}
IERC20(item.paymentToken).safeTransferFrom(_msgSender(), item.beneficiary, receivedAmount);
}
// transfer nft to buyer
IERC721(item.nft).transferFrom(address(this), _msgSender(), item.tokenId);
emit BoughtItem(item.itemId, _msgSender());
}
function closeItem(uint256 _itemId) external {
Item storage item = items[_itemId];
if (item.itemId == 0) revert NotExistedItem();
if (item.status != ItemStatus.OPENING) revert NotOpeningItem();
if (item.seller != _msgSender()) revert OnlyItemOwner();
item.status = ItemStatus.CLOSED;
// transfer nft to buyer
IERC721(item.nft).transferFrom(address(this), _msgSender(), item.tokenId);
emit ClosedItem(_itemId);
}
function setPaymentToken(address _token, bool allow) external onlyAdmin {
paymentToken[_token] = allow;
emit SetPaymentToken(_token, allow);
}
function setFeeReceiver(address _feeReceiver) external onlyAdmin {
if (_feeReceiver == address(0)) revert InvalidFeeReceiver();
address oldValue = feeReceiver;
feeReceiver = _feeReceiver;
emit SetFeeReceiver(oldValue, _feeReceiver);
}
function setFeePercent(uint256 _newValue) external onlyAdmin {
if (_newValue > 10000) revert InvalidFeePercent();
uint256 oldValue = feePercent;
feePercent = _newValue;
emit SetFeePercent(oldValue, _newValue);
}
}
File 50 of 59: contracts/LendingPool/interfaces/ILendingPool.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
/**
* @title Lending Pool Interface
*
*/
interface ILendingPool {
function informDisburse(address _token, address _to, uint256 _amount) external;
function informPayBack(address _token, uint256 _principal) external;
function approveToPayRewards(address _token, uint256 _amount) external;
function isAdmin(address _account) external view returns (bool);
function owner() external view returns (address);
}
File 51 of 59: @openzeppelin/contracts/utils/Create2.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/Create2.sol)
pragma solidity ^0.8.20;
import {Errors} from "./Errors.sol";
/**
* @dev Helper to make usage of the `CREATE2` EVM opcode easier and safer.
* `CREATE2` can be used to compute in advance the address where a smart
* contract will be deployed, which allows for interesting new mechanisms known
* as 'counterfactual interactions'.
*
* See the https://eips.ethereum.org/EIPS/eip-1014#motivation[EIP] for more
* information.
*/
library Create2 {
/**
* @dev There's no code to deploy.
*/
error Create2EmptyBytecode();
/**
* @dev Deploys a contract using `CREATE2`. The address where the contract
* will be deployed can be known in advance via {computeAddress}.
*
* The bytecode for a contract can be obtained from Solidity with
* `type(contractName).creationCode`.
*
* Requirements:
*
* - `bytecode` must not be empty.
* - `salt` must have not been used for `bytecode` already.
* - the factory must have a balance of at least `amount`.
* - if `amount` is non-zero, `bytecode` must have a `payable` constructor.
*/
function deploy(uint256 amount, bytes32 salt, bytes memory bytecode) internal returns (address addr) {
if (address(this).balance < amount) {
revert Errors.InsufficientBalance(address(this).balance, amount);
}
if (bytecode.length == 0) {
revert Create2EmptyBytecode();
}
assembly ("memory-safe") {
addr := create2(amount, add(bytecode, 0x20), mload(bytecode), salt)
// if no address was created, and returndata is not empty, bubble revert
if and(iszero(addr), not(iszero(returndatasize()))) {
let p := mload(0x40)
returndatacopy(p, 0, returndatasize())
revert(p, returndatasize())
}
}
if (addr == address(0)) {
revert Errors.FailedDeployment();
}
}
/**
* @dev Returns the address where a contract will be stored if deployed via {deploy}. Any change in the
* `bytecodeHash` or `salt` will result in a new destination address.
*/
function computeAddress(bytes32 salt, bytes32 bytecodeHash) internal view returns (address) {
return computeAddress(salt, bytecodeHash, address(this));
}
/**
* @dev Returns the address where a contract will be stored if deployed via {deploy} from a contract located at
* `deployer`. If `deployer` is this contract's address, returns the same value as {computeAddress}.
*/
function computeAddress(bytes32 salt, bytes32 bytecodeHash, address deployer) internal pure returns (address addr) {
assembly ("memory-safe") {
let ptr := mload(0x40) // Get free memory pointer
// | | ↓ ptr ... ↓ ptr + 0x0B (start) ... ↓ ptr + 0x20 ... ↓ ptr + 0x40 ... |
// |-------------------|---------------------------------------------------------------------------|
// | bytecodeHash | CCCCCCCCCCCCC...CC |
// | salt | BBBBBBBBBBBBB...BB |
// | deployer | 000000...0000AAAAAAAAAAAAAAAAAAA...AA |
// | 0xFF | FF |
// |-------------------|---------------------------------------------------------------------------|
// | memory | 000000...00FFAAAAAAAAAAAAAAAAAAA...AABBBBBBBBBBBBB...BBCCCCCCCCCCCCC...CC |
// | keccak(start, 85) | ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑ |
mstore(add(ptr, 0x40), bytecodeHash)
mstore(add(ptr, 0x20), salt)
mstore(ptr, deployer) // Right-aligned with 12 preceding garbage bytes
let start := add(ptr, 0x0b) // The hashed data starts at the final garbage byte which we will set to 0xff
mstore8(start, 0xff)
addr := and(keccak256(start, 85), 0xffffffffffffffffffffffffffffffffffffffff)
}
}
}
File 52 of 59: @openzeppelin/contracts/utils/Errors.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/Errors.sol)
pragma solidity ^0.8.20;
/**
* @dev Collection of common custom errors used in multiple contracts
*
* IMPORTANT: Backwards compatibility is not guaranteed in future versions of the library.
* It is recommended to avoid relying on the error API for critical functionality.
*
* _Available since v5.1._
*/
library Errors {
/**
* @dev The ETH balance of the account is not enough to perform the operation.
*/
error InsufficientBalance(uint256 balance, uint256 needed);
/**
* @dev A call to an address target failed. The target may have reverted.
*/
error FailedCall();
/**
* @dev The deployment failed.
*/
error FailedDeployment();
/**
* @dev A necessary precompile is missing.
*/
error MissingPrecompile(address);
}
File 53 of 59: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.20;
import {IERC20} from "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC-20 standard.
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
File 54 of 59: contracts/loans/direct/LoanChecksAndCalculations.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
import {IDirectLoanBase} from "./IDirectLoanBase.sol";
import {LoanData} from "./LoanData.sol";
/**
* @title LoanChecksAndCalculations
* @notice Helper library for LoanBase
*/
library LoanChecksAndCalculations {
/* ******* */
/* STORAGE */
/* ******* */
uint16 private constant HUNDRED_PERCENT = 10000;
/* ********* */
/* FUNCTIONS */
/* ********* */
/**
* @notice Function that performs some validation checks before trying to repay a loan
* @dev Everyone can call
* @param _loanId - The id of the loan being repaid
*/
function payBackChecks(bytes32 _loanId) external view {
// Sanity check that payBackLoan() and liquidateOverdueLoan() have never been called on this loanId.
// Depending on how the rest of the code turns out, this check may be unnecessary.
checkLoanIdValidity(_loanId);
// Fetch loan details from storage, but store them in memory for the sake of saving gas.
(, , , , uint32 duration, , uint64 loanStartTime, , , , ) = IDirectLoanBase(address(this)).loanIdToLoan(
_loanId
);
// When a loan exceeds the loan term, it is expired. At this stage the Lender can call Liquidate Loan to resolve
// the loan.
require(block.timestamp <= (uint256(loanStartTime) + uint256(duration)), "Loan is expired");
}
/**
* @notice check loan's id is valid or not
* @dev Everyone can call
* @param _loanId Id of loan
*/
function checkLoanIdValidity(bytes32 _loanId) public view {
require(!IDirectLoanBase(address(this)).loanRepaidOrLiquidated(_loanId), "Loan already repaid/liquidated");
require(IDirectLoanBase(address(this)).isValidLoanId(_loanId), "None existed loan ID");
}
/**
* @dev Performs some validation checks before trying to renegotiate a loan.
* Needed to avoid stack too deep.
*
* @param _loan - The main Loan Terms struct.
* @param _loanId - The unique identifier for the loan to be renegotiated
* @param _newLoanDuration - The new amount of time (measured in seconds) that can elapse before the lender can
* liquidate the loan and seize the underlying collateral NFT.
* @param _newMaximumRepaymentAmount - The new maximum amount of money that the borrower would be required to
* retrieve their collateral, measured in the smallest units of the ERC20 currency used for the loan. The
* borrower will always have to pay this amount to retrieve their collateral, regardless of whether they repay
* early.
* @param _lenderNonce - The nonce referred to here is not the same as an Ethereum account's nonce. We are
* referring instead to nonces that are used by both the lender and the borrower when they are first signing
* off-chain Loan orders. These nonces can be any uint256 value that the user has not previously used to sign an
* off-chain order. Each nonce can be used at most once per user within Loan, regardless of whether they are the
* lender or the borrower in that situation. This serves two purposes:
* - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
* - Second, it allows a user to cancel an off-chain order by calling Loan.cancelLoanCommitmentBeforeLoanHasBegun()
, which marks the nonce as used and prevents any future loan from using the user's off-chain order that contains
* that nonce.
* @return Borrower and Lender addresses
*/
function renegotiationChecks(
LoanData.LoanTerms memory _loan,
bytes32 _loanId,
uint32 _newLoanDuration,
uint256 _newMaximumRepaymentAmount,
uint256 _lenderNonce
) external view returns (address, address) {
checkLoanIdValidity(_loanId);
require(msg.sender == _loan.borrower, "Only borrower can initiate");
require(block.timestamp <= (uint256(_loan.loanStartTime) + _newLoanDuration), "New duration already expired");
require(
uint256(_newLoanDuration) <= IDirectLoanBase(address(this)).maximumLoanDuration(),
"New duration exceeds maximum loan duration"
);
require(_newMaximumRepaymentAmount >= _loan.principalAmount, "Negative interest rate loans are not allowed");
require(
!IDirectLoanBase(address(this)).getWhetherNonceHasBeenUsedForUser(_loan.lender, _lenderNonce),
"Lender nonce invalid"
);
return (_loan.borrower, _loan.lender);
}
/**
* @notice A convenience function computing the adminFee taken from a specified quantity of interest.
*
* @param _interestDue - The amount of interest due, measured in the smallest quantity of the ERC20 currency being
* used to pay the interest.
* @param _adminFeeInBasisPoints - The percent (measured in basis points) of the interest earned that will be taken
* as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
* attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
* earned.
*
* @return The quantity of ERC20 currency (measured in smalled units of that ERC20 currency) that is due as an admin
* fee.
*/
function computeAdminFee(uint256 _interestDue, uint256 _adminFeeInBasisPoints) external pure returns (uint256) {
return (_interestDue * _adminFeeInBasisPoints) / HUNDRED_PERCENT;
}
}
File 55 of 59: contracts/TokenBoundAccount/interfaces/ITokenBoundAccountRegistry.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
interface ITokenBoundAccountRegistry {
event AccountCreated(
address account,
address implementation,
uint256 chainId,
address tokenContract,
uint256 tokenId,
uint256 salt
);
function createAccount(
address implementation,
uint256 chainId,
address tokenContract,
uint256 tokenId,
uint256 seed
) external returns (address);
function account(
address implementation,
uint256 chainId,
address tokenContract,
uint256 tokenId,
uint256 salt
) external view returns (address);
}
File 56 of 59: @openzeppelin/contracts/interfaces/IERC1271.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/IERC1271.sol)
pragma solidity ^0.8.20;
/**
* @dev Interface of the ERC-1271 standard signature validation method for
* contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
*/
interface IERC1271 {
/**
* @dev Should return whether the signature provided is valid for the provided data
* @param hash Hash of the data to be signed
* @param signature Signature byte array associated with _data
*/
function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
}
File 57 of 59: @openzeppelin/contracts/access/Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)
pragma solidity ^0.8.20;
import {Context} from "../utils/Context.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 58 of 59: contracts/loans/direct/IDirectLoanBase.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;
interface IDirectLoanBase {
function maximumLoanDuration() external view returns (uint256);
function adminFeeInBasisPoints() external view returns (uint16);
function loanIdToLoan(
bytes32
)
external
view
returns (
uint256,
uint256,
uint256,
address,
uint32,
uint16,
uint64,
address,
address,
address,
bool
);
function loanRepaidOrLiquidated(bytes32) external view returns (bool);
function getWhetherNonceHasBeenUsedForUser(address _user, uint256 _nonce) external view returns (bool);
function isValidLoanId(bytes32 _loanId) external view returns (bool);
}
File 59 of 59: @openzeppelin/contracts/utils/cryptography/MessageHashUtils.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/cryptography/MessageHashUtils.sol)
pragma solidity ^0.8.20;
import {Strings} from "../Strings.sol";
/**
* @dev Signature message hash utilities for producing digests to be consumed by {ECDSA} recovery or signing.
*
* The library provides methods for generating a hash of a message that conforms to the
* https://eips.ethereum.org/EIPS/eip-191[ERC-191] and https://eips.ethereum.org/EIPS/eip-712[EIP 712]
* specifications.
*/
library MessageHashUtils {
/**
* @dev Returns the keccak256 digest of an ERC-191 signed data with version
* `0x45` (`personal_sign` messages).
*
* The digest is calculated by prefixing a bytes32 `messageHash` with
* `"\x19Ethereum Signed Message:\n32"` and hashing the result. It corresponds with the
* hash signed when using the https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] JSON-RPC method.
*
* NOTE: The `messageHash` parameter is intended to be the result of hashing a raw message with
* keccak256, although any bytes32 value can be safely used because the final digest will
* be re-hashed.
*
* See {ECDSA-recover}.
*/
function toEthSignedMessageHash(bytes32 messageHash) internal pure returns (bytes32 digest) {
assembly ("memory-safe") {
mstore(0x00, "\x19Ethereum Signed Message:\n32") // 32 is the bytes-length of messageHash
mstore(0x1c, messageHash) // 0x1c (28) is the length of the prefix
digest := keccak256(0x00, 0x3c) // 0x3c is the length of the prefix (0x1c) + messageHash (0x20)
}
}
/**
* @dev Returns the keccak256 digest of an ERC-191 signed data with version
* `0x45` (`personal_sign` messages).
*
* The digest is calculated by prefixing an arbitrary `message` with
* `"\x19Ethereum Signed Message:\n" + len(message)` and hashing the result. It corresponds with the
* hash signed when using the https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] JSON-RPC method.
*
* See {ECDSA-recover}.
*/
function toEthSignedMessageHash(bytes memory message) internal pure returns (bytes32) {
return
keccak256(bytes.concat("\x19Ethereum Signed Message:\n", bytes(Strings.toString(message.length)), message));
}
/**
* @dev Returns the keccak256 digest of an ERC-191 signed data with version
* `0x00` (data with intended validator).
*
* The digest is calculated by prefixing an arbitrary `data` with `"\x19\x00"` and the intended
* `validator` address. Then hashing the result.
*
* See {ECDSA-recover}.
*/
function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {
return keccak256(abi.encodePacked(hex"19_00", validator, data));
}
/**
* @dev Returns the keccak256 digest of an EIP-712 typed data (ERC-191 version `0x01`).
*
* The digest is calculated from a `domainSeparator` and a `structHash`, by prefixing them with
* `\x19\x01` and hashing the result. It corresponds to the hash signed by the
* https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] JSON-RPC method as part of EIP-712.
*
* See {ECDSA-recover}.
*/
function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 digest) {
assembly ("memory-safe") {
let ptr := mload(0x40)
mstore(ptr, hex"19_01")
mstore(add(ptr, 0x02), domainSeparator)
mstore(add(ptr, 0x22), structHash)
digest := keccak256(ptr, 0x42)
}
}
}
编译器设置
{"outputSelection":{"*":{"*":["*"],"":["*"]}},"optimizer":{"runs":200,"enabled":true},"libraries":{},"evmVersion":"paris"}
合同 ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"string","name":"_baseURI","internalType":"string"}]},{"type":"error","name":"ERC721IncorrectOwner","inputs":[{"type":"address","name":"sender","internalType":"address"},{"type":"uint256","name":"tokenId","internalType":"uint256"},{"type":"address","name":"owner","internalType":"address"}]},{"type":"error","name":"ERC721InsufficientApproval","inputs":[{"type":"address","name":"operator","internalType":"address"},{"type":"uint256","name":"tokenId","internalType":"uint256"}]},{"type":"error","name":"ERC721InvalidApprover","inputs":[{"type":"address","name":"approver","internalType":"address"}]},{"type":"error","name":"ERC721InvalidOperator","inputs":[{"type":"address","name":"operator","internalType":"address"}]},{"type":"error","name":"ERC721InvalidOwner","inputs":[{"type":"address","name":"owner","internalType":"address"}]},{"type":"error","name":"ERC721InvalidReceiver","inputs":[{"type":"address","name":"receiver","internalType":"address"}]},{"type":"error","name":"ERC721InvalidSender","inputs":[{"type":"address","name":"sender","internalType":"address"}]},{"type":"error","name":"ERC721NonexistentToken","inputs":[{"type":"uint256","name":"tokenId","internalType":"uint256"}]},{"type":"event","name":"Approval","inputs":[{"type":"address","name":"owner","internalType":"address","indexed":true},{"type":"address","name":"approved","internalType":"address","indexed":true},{"type":"uint256","name":"tokenId","internalType":"uint256","indexed":true}],"anonymous":false},{"type":"event","name":"ApprovalForAll","inputs":[{"type":"address","name":"owner","internalType":"address","indexed":true},{"type":"address","name":"operator","internalType":"address","indexed":true},{"type":"bool","name":"approved","internalType":"bool","indexed":false}],"anonymous":false},{"type":"event","name":"BatchMetadataUpdate","inputs":[{"type":"uint256","name":"_fromTokenId","internalType":"uint256","indexed":false},{"type":"uint256","name":"_toTokenId","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"MetadataUpdate","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Transfer","inputs":[{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":true},{"type":"uint256","name":"tokenId","internalType":"uint256","indexed":true}],"anonymous":false},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"approve","inputs":[{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"balanceOf","inputs":[{"type":"address","name":"owner","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"baseExtension","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"baseURI","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"getApproved","inputs":[{"type":"uint256","name":"tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isApprovedForAll","inputs":[{"type":"address","name":"owner","internalType":"address"},{"type":"address","name":"operator","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"mint","inputs":[{"type":"address","name":"_to","internalType":"address"},{"type":"uint256","name":"_amount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"name","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"ownerOf","inputs":[{"type":"uint256","name":"tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"safeTransferFrom","inputs":[{"type":"address","name":"from","internalType":"address"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"safeTransferFrom","inputs":[{"type":"address","name":"from","internalType":"address"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"tokenId","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setApprovalForAll","inputs":[{"type":"address","name":"operator","internalType":"address"},{"type":"bool","name":"approved","internalType":"bool"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"supportsInterface","inputs":[{"type":"bytes4","name":"interfaceId","internalType":"bytes4"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"symbol","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"tokenIds","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"tokenURI","inputs":[{"type":"uint256","name":"tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferFrom","inputs":[{"type":"address","name":"from","internalType":"address"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"tokenId","internalType":"uint256"}]}]
合同创建代码
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