Feature Tip: Add private address tag to any address under My Name Tag !
Overview
Max Total Supply
17,214,000.844841487909691676 UZD
Holders
267 (0.00%)
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
2,817.994333303952225551 UZDValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
UZD
Compiler Version
v0.8.16+commit.07a7930e
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import './ZunamiElasticRigidVault.sol'; contract UZD is ZunamiElasticRigidVault { address public constant ZUNAMI = 0x2ffCC661011beC72e1A9524E12060983E74D14ce; constructor() ElasticERC20('UZD Zunami Stable', 'UZD') ElasticRigidVault(IERC20Metadata(ZUNAMI)) ZunamiElasticRigidVault(ZUNAMI) {} }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import '@openzeppelin/contracts/access/AccessControl.sol'; import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol'; import './ElasticRigidVault.sol'; import './RigidAddressSet.sol'; import './interfaces/IRedistributor.sol'; abstract contract ZunamiElasticRigidVault is AccessControl, ElasticRigidVault, RigidAddressSet { using Math for uint256; bytes32 public constant REBALANCER_ROLE = keccak256('REBALANCER_ROLE'); uint256 public constant FEE_DENOMINATOR = 1000000; // 100.0000% uint256 public constant MAX_FEE = 50000; // 5% uint256 public withdrawFee; address public feeDistributor; uint256 public dailyDepositDuration; // in blocks uint256 public dailyDepositLimit; // in minimal value uint256 public dailyWithdrawDuration; // in blocks uint256 public dailyWithdrawLimit; // in minimal value uint256 public dailyDepositTotal; uint256 public dailyDepositCountingBlock; // start block of limit counting uint256 public dailyWithdrawTotal; uint256 public dailyWithdrawCountingBlock; // start block of limit counting IAssetPriceOracle public immutable priceOracle; IRedistributor public redistributor; uint256 private _assetPriceCacheDuration = 1200; // cache every 4 hour event AssetPriceCacheDurationSet( uint256 newAssetPriceCacheDuration, uint256 oldAssetPriceCacheDuration ); event DailyDepositParamsChanged(uint256 dailyDepositDuration, uint256 dailyDepositLimit); event DailyWithdrawParamsChanged(uint256 dailyWithdrawDuration, uint256 dailyWithdrawLimit); event WithdrawFeeChanged(uint256 withdrawFee); event FeeDistributorChanged(address feeDistributor); event RedistributorChanged(address redistributor); constructor(address priceOracle_) { _setupRole(DEFAULT_ADMIN_ROLE, msg.sender); require(priceOracle_ != address(0), 'Zero price oracle'); priceOracle = IAssetPriceOracle(priceOracle_); cacheAssetPrice(); } function assetPrice() public view override returns (uint256) { return priceOracle.lpPrice(); } function assetPriceCacheDuration() public view override returns (uint256) { return _assetPriceCacheDuration; } function setAssetPriceCacheDuration(uint256 assetPriceCacheDuration_) external onlyRole(DEFAULT_ADMIN_ROLE) { emit AssetPriceCacheDurationSet(assetPriceCacheDuration_, _assetPriceCacheDuration); _assetPriceCacheDuration = assetPriceCacheDuration_; } function changeDailyDepositParams(uint256 dailyDepositDuration_, uint256 dailyDepositLimit_) external onlyRole(DEFAULT_ADMIN_ROLE) { dailyDepositDuration = dailyDepositDuration_; dailyDepositLimit = dailyDepositLimit_; dailyDepositTotal = 0; dailyDepositCountingBlock = dailyDepositDuration_ > 0 ? block.number : 0; emit DailyDepositParamsChanged(dailyDepositDuration_, dailyDepositLimit_); } function changeDailyWithdrawParams(uint256 dailyWithdrawDuration_, uint256 dailyWithdrawLimit_) external onlyRole(DEFAULT_ADMIN_ROLE) { dailyWithdrawDuration = dailyWithdrawDuration_; dailyWithdrawLimit = dailyWithdrawLimit_; dailyWithdrawTotal = 0; dailyWithdrawCountingBlock = dailyWithdrawDuration_ > 0 ? block.number : 0; emit DailyWithdrawParamsChanged(dailyWithdrawDuration_, dailyWithdrawLimit_); } function changeWithdrawFee(uint256 withdrawFee_) external onlyRole(DEFAULT_ADMIN_ROLE) { require(withdrawFee_ <= MAX_FEE, 'Bigger that MAX_FEE constant'); withdrawFee = withdrawFee_; emit WithdrawFeeChanged(withdrawFee_); } function changeFeeDistributor(address feeDistributor_) external onlyRole(DEFAULT_ADMIN_ROLE) { require(feeDistributor_ != address(0), 'Zero fee distributor'); feeDistributor = feeDistributor_; emit FeeDistributorChanged(feeDistributor_); } function _beforeDeposit( address caller, address, uint256 value, uint256 ) internal override { uint256 dailyDuration = dailyDepositDuration; if (dailyDuration > 0 && !hasRole(REBALANCER_ROLE, caller)) { if (block.number > dailyDepositCountingBlock + dailyDuration) { dailyDepositTotal = value; dailyDepositCountingBlock = block.number; } else { dailyDepositTotal += value; } require(dailyDepositTotal <= dailyDepositLimit, 'Daily deposit limit overflow'); } } function _beforeWithdraw( address caller, address, address, uint256 value, uint256 ) internal override { uint256 dailyDuration = dailyWithdrawDuration; if (dailyDuration > 0 && !hasRole(REBALANCER_ROLE, caller)) { if (block.number > dailyWithdrawCountingBlock + dailyDuration) { dailyWithdrawTotal = value; dailyWithdrawCountingBlock = block.number; } else { dailyWithdrawTotal += value; } require(dailyWithdrawTotal <= dailyWithdrawLimit, 'Daily withdraw limit overflow'); } } function _calcFee(address caller, uint256 nominal) internal view override returns (uint256 nominalFee) { nominalFee = 0; uint256 withdrawFee_ = withdrawFee; if (withdrawFee_ > 0 && !hasRole(REBALANCER_ROLE, caller)) { nominalFee = nominal.mulDiv(withdrawFee_, FEE_DENOMINATOR, Math.Rounding.Down); } } function _withdrawFee(uint256 nominalFee) internal override { if (nominalFee > 0) { SafeERC20.safeTransfer(IERC20Metadata(asset()), feeDistributor, nominalFee); } } function containRigidAddress(address _rigidAddress) public view override returns (bool) { return _containRigidAddress(_rigidAddress); } function addRigidAddress(address _rigidAddress) public onlyRole(DEFAULT_ADMIN_ROLE) { require(!containRigidAddress(_rigidAddress), 'Not elastic address'); uint256 balanceElastic = balanceOf(_rigidAddress); _addRigidAddress(_rigidAddress); if (balanceElastic > 0) { _convertElasticToRigidBalancePartially(_rigidAddress, balanceElastic); } } function removeRigidAddress(address _rigidAddress) public onlyRole(DEFAULT_ADMIN_ROLE) { require(containRigidAddress(_rigidAddress), 'Not rigid address'); uint256 balanceRigid = balanceOf(_rigidAddress); _removeRigidAddress(_rigidAddress); if (balanceRigid > 0) { _convertRigidToElasticBalancePartially(_rigidAddress, balanceRigid); } } function setRedistributor(address _redistributor) public onlyRole(DEFAULT_ADMIN_ROLE) { require(_redistributor != address(0), 'Zero redistributor address'); redistributor = IRedistributor(_redistributor); emit RedistributorChanged(_redistributor); } function redistribute() public { uint256 totalRigidNominal = _convertToNominalWithCaching( totalSupplyRigid(), Math.Rounding.Up ); uint256 lockedNominalRigid_ = lockedNominalRigid(); require( lockedNominalRigid_ >= totalRigidNominal, 'Wrong redistribution total nominal balance' ); uint256 nominal; unchecked { nominal = lockedNominalRigid_ - totalRigidNominal; } _decreaseLockedNominalRigidBy(nominal); IRedistributor redistributor_ = redistributor; SafeERC20.safeIncreaseAllowance(IERC20Metadata(asset()), address(redistributor_), nominal); redistributor_.requestRedistribution(nominal); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import '@openzeppelin/contracts/utils/structs/EnumerableSet.sol'; import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol'; contract RigidAddressSet { using EnumerableSet for EnumerableSet.AddressSet; EnumerableSet.AddressSet private _rigidAddresses; event AddedRigidAddress(address indexed rigidAddress); event RemovedRigidAddress(address indexed rigidAddress); function rigidAddresses() public view returns (address[] memory) { return _rigidAddresses.values(); } function _addRigidAddress(address _rigidAddress) internal { if(_rigidAddresses.add(_rigidAddress)) { emit AddedRigidAddress(_rigidAddress); } else { revert("RigidAddressSet: add existed address"); } } function _removeRigidAddress(address _rigidAddress) internal { if(_rigidAddresses.remove(_rigidAddress)){ emit RemovedRigidAddress(_rigidAddress); } else { revert("RigidAddressSet: remove un-existed address"); } } function _containRigidAddress(address _rigidAddress) internal view returns (bool) { return _rigidAddresses.contains(_rigidAddress); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import '@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol'; import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol'; import '@openzeppelin/contracts/utils/math/Math.sol'; import './interfaces/IElasticVault.sol'; import './ElasticERC20RigidExtension.sol'; /** * @dev Based on OpenZeppelin v4.7.0 ERC4626, but withdraw is in fact redeem with other simplifications. */ abstract contract ElasticRigidVault is ElasticERC20RigidExtension, IElasticVault { using Math for uint256; IERC20Metadata private immutable _asset; /** * @dev Set the underlying asset contract. This must be an ERC20-compatible contract (ERC20 or ERC777). */ constructor(IERC20Metadata asset_) { _asset = asset_; } function asset() public view virtual override returns (address) { return address(_asset); } function totalAssets() public view virtual override returns (uint256) { return _asset.balanceOf(address(this)); } function convertToNominal(uint256 value) public view virtual override returns (uint256 nominal) { return _convertToNominalCached(value, Math.Rounding.Down); } function convertToValue(uint256 nominal) public view virtual override returns (uint256 value) { return _convertFromNominalCached(nominal, Math.Rounding.Down); } function maxDeposit(address) public view virtual override returns (uint256) { return _isVaultCollateralized() ? type(uint256).max : 0; } function maxWithdraw(address owner) public view virtual override returns (uint256) { return balanceOf(owner); } function previewDeposit(uint256 nominal) public view virtual override returns (uint256) { return _convertFromNominalCached(nominal, Math.Rounding.Down); } function _previewDepositWithCaching(uint256 nominal) internal virtual returns (uint256) { return _convertFromNominalWithCaching(nominal, Math.Rounding.Down); } function previewWithdraw(uint256 value) public view virtual override returns (uint256) { uint256 nominal = _convertToNominalCached(value, Math.Rounding.Down); uint256 nominalFee = _calcFee( _msgSender(), nominal ); return nominal - nominalFee; } function _previewWithdrawWithCaching(uint256 value) internal virtual returns (uint256) { return _convertToNominalWithCaching(value, Math.Rounding.Down); } function deposit(uint256 nominal, address receiver) public virtual override returns (uint256) { require(nominal <= maxDeposit(receiver), 'ElasticVault: deposit more than max'); uint256 value = _previewDepositWithCaching(nominal); _deposit(_msgSender(), receiver, value, nominal); return value; } function withdraw( uint256 value, address receiver, address owner ) public virtual override returns (uint256) { uint256 nominal = _previewWithdrawWithCaching(value); require(nominal <= balanceOfNominal(owner), 'ElasticVault: withdraw more than max'); _withdraw(_msgSender(), receiver, owner, value, nominal); return nominal; } function withdrawAll(address receiver, address owner) public virtual returns (uint256) { uint256 nominal = balanceOfNominal(owner); uint256 value = balanceOf(owner); _withdraw(_msgSender(), receiver, owner, value, nominal); return nominal; } function _beforeDeposit( address caller, address receiver, uint256 value, uint256 nominal ) internal virtual {} /** * @dev Deposit/mint common workflow. */ function _deposit( address caller, address receiver, uint256 value, uint256 nominal ) internal virtual { _beforeDeposit(caller, receiver, value, nominal); // If _asset is ERC777, `transferFrom` can trigger a reentrancy BEFORE the transfer happens through the // `tokensToSend` hook. On the other hand, the `tokenReceived` hook, that is triggered after the transfer, // calls the vault, which is assumed not malicious. // // Conclusion: we need to do the transfer before we mint so that any reentrancy would happen before the // value are transferred and before the nominal are minted, which is a valid state. // slither-disable-next-line reentrancy-no-eth SafeERC20.safeTransferFrom(IERC20Metadata(asset()), caller, address(this), nominal); _mintElastic(receiver, nominal, value); emit Deposit(caller, receiver, value, nominal); } function _beforeWithdraw( address caller, address receiver, address owner, uint256 value, uint256 nominal ) internal virtual {} function _calcFee(address, uint256) internal view virtual returns (uint256 nominalFee) { return 0; } function _withdrawFee(uint256 nominal) internal virtual {} /** * @dev Withdraw/redeem common workflow. */ function _withdraw( address caller, address receiver, address owner, uint256 value, uint256 nominal ) internal virtual { _beforeWithdraw(caller, receiver, owner, value, nominal); if (caller != owner) { _spendAllowanceElastic(owner, caller, value); } uint256 nominalFee = _calcFee(caller, nominal); _withdrawFee(nominalFee); // If _asset is ERC777, `transfer` can trigger a reentrancy AFTER the transfer happens through the // `tokensReceived` hook. On the other hand, the `tokensToSend` hook, that is triggered before the transfer, // calls the vault, which is assumed not malicious. // // Conclusion: we need to do the transfer after the burn so that any reentrancy would happen after the // nominal are burned and after the value are transfered, which is a valid state. _burnElastic(owner, nominal, value); SafeERC20.safeTransfer(IERC20Metadata(asset()), receiver, nominal - nominalFee); emit Withdraw(caller, receiver, owner, value, nominal, nominalFee); } function _isVaultCollateralized() private view returns (bool) { return totalAssets() > 0 || totalSupplyNominal() == 0; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface IRedistributor { function requestRedistribution(uint256 nominal) external; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (access/AccessControl.sol) pragma solidity ^0.8.0; import "./IAccessControl.sol"; import "../utils/Context.sol"; import "../utils/Strings.sol"; import "../utils/introspection/ERC165.sol"; /** * @dev Contract module that allows children to implement role-based access * control mechanisms. This is a lightweight version that doesn't allow enumerating role * members except through off-chain means by accessing the contract event logs. Some * applications may benefit from on-chain enumerability, for those cases see * {AccessControlEnumerable}. * * Roles are referred to by their `bytes32` identifier. These should be exposed * in the external API and be unique. The best way to achieve this is by * using `public constant` hash digests: * * ``` * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); * ``` * * Roles can be used to represent a set of permissions. To restrict access to a * function call, use {hasRole}: * * ``` * function foo() public { * require(hasRole(MY_ROLE, msg.sender)); * ... * } * ``` * * Roles can be granted and revoked dynamically via the {grantRole} and * {revokeRole} functions. Each role has an associated admin role, and only * accounts that have a role's admin role can call {grantRole} and {revokeRole}. * * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means * that only accounts with this role will be able to grant or revoke other * roles. More complex role relationships can be created by using * {_setRoleAdmin}. * * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to * grant and revoke this role. Extra precautions should be taken to secure * accounts that have been granted it. */ abstract contract AccessControl is Context, IAccessControl, ERC165 { struct RoleData { mapping(address => bool) members; bytes32 adminRole; } mapping(bytes32 => RoleData) private _roles; bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; /** * @dev Modifier that checks that an account has a specific role. Reverts * with a standardized message including the required role. * * The format of the revert reason is given by the following regular expression: * * /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/ * * _Available since v4.1._ */ modifier onlyRole(bytes32 role) { _checkRole(role); _; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId); } /** * @dev Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) public view virtual override returns (bool) { return _roles[role].members[account]; } /** * @dev Revert with a standard message if `_msgSender()` is missing `role`. * Overriding this function changes the behavior of the {onlyRole} modifier. * * Format of the revert message is described in {_checkRole}. * * _Available since v4.6._ */ function _checkRole(bytes32 role) internal view virtual { _checkRole(role, _msgSender()); } /** * @dev Revert with a standard message if `account` is missing `role`. * * The format of the revert reason is given by the following regular expression: * * /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/ */ function _checkRole(bytes32 role, address account) internal view virtual { if (!hasRole(role, account)) { revert( string( abi.encodePacked( "AccessControl: account ", Strings.toHexString(uint160(account), 20), " is missing role ", Strings.toHexString(uint256(role), 32) ) ) ); } } /** * @dev Returns the admin role that controls `role`. See {grantRole} and * {revokeRole}. * * To change a role's admin, use {_setRoleAdmin}. */ function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) { return _roles[role].adminRole; } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. * * Requirements: * * - the caller must have ``role``'s admin role. * * May emit a {RoleGranted} event. */ function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) { _grantRole(role, account); } /** * @dev Revokes `role` from `account`. * * If `account` had been granted `role`, emits a {RoleRevoked} event. * * Requirements: * * - the caller must have ``role``'s admin role. * * May emit a {RoleRevoked} event. */ function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) { _revokeRole(role, account); } /** * @dev Revokes `role` from the calling account. * * Roles are often managed via {grantRole} and {revokeRole}: this function's * purpose is to provide a mechanism for accounts to lose their privileges * if they are compromised (such as when a trusted device is misplaced). * * If the calling account had been revoked `role`, emits a {RoleRevoked} * event. * * Requirements: * * - the caller must be `account`. * * May emit a {RoleRevoked} event. */ function renounceRole(bytes32 role, address account) public virtual override { require(account == _msgSender(), "AccessControl: can only renounce roles for self"); _revokeRole(role, account); } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. Note that unlike {grantRole}, this function doesn't perform any * checks on the calling account. * * May emit a {RoleGranted} event. * * [WARNING] * ==== * This function should only be called from the constructor when setting * up the initial roles for the system. * * Using this function in any other way is effectively circumventing the admin * system imposed by {AccessControl}. * ==== * * NOTE: This function is deprecated in favor of {_grantRole}. */ function _setupRole(bytes32 role, address account) internal virtual { _grantRole(role, account); } /** * @dev Sets `adminRole` as ``role``'s admin role. * * Emits a {RoleAdminChanged} event. */ function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { bytes32 previousAdminRole = getRoleAdmin(role); _roles[role].adminRole = adminRole; emit RoleAdminChanged(role, previousAdminRole, adminRole); } /** * @dev Grants `role` to `account`. * * Internal function without access restriction. * * May emit a {RoleGranted} event. */ function _grantRole(bytes32 role, address account) internal virtual { if (!hasRole(role, account)) { _roles[role].members[account] = true; emit RoleGranted(role, account, _msgSender()); } } /** * @dev Revokes `role` from `account`. * * Internal function without access restriction. * * May emit a {RoleRevoked} event. */ function _revokeRole(bytes32 role, address account) internal virtual { if (hasRole(role, account)) { _roles[role].members[account] = false; emit RoleRevoked(role, account, _msgSender()); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/draft-IERC20Permit.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 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 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @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). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableSet.sol) pragma solidity ^0.8.0; /** * @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. * * ``` * 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 of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping(bytes32 => uint256) _indexes; } /** * @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._indexes[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 read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 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 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; if (lastIndex != toDeleteIndex) { bytes32 lastValue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastValue; // Update the index for the moved value set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex } // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[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._indexes[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) { return _values(set._inner); } // 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; /// @solidity memory-safe-assembly assembly { 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 on 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; /// @solidity memory-safe-assembly assembly { result := store } return result; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import '@openzeppelin/contracts/access/AccessControl.sol'; import '@openzeppelin/contracts/utils/structs/EnumerableSet.sol'; import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol'; import '@openzeppelin/contracts/utils/math/Math.sol'; import './ElasticERC20.sol'; abstract contract ElasticERC20RigidExtension is ElasticERC20 { using Math for uint256; mapping(address => uint256) private _balancesRigid; mapping(address => mapping(address => uint256)) private _allowancesRigid; uint256 private _totalSupplyRigid; uint256 private _lockedNominal; event ConvertedToElastic(address indexed owner, uint256 value, uint256 nominal); event ConvertedToRigid(address indexed owner, uint256 value, uint256 nominal); function containRigidAddress(address _rigidAddress) public view virtual returns (bool); function totalSupplyRigid() public view returns (uint256) { return _totalSupplyRigid; } function lockedNominalRigid() public view returns (uint256) { return _lockedNominal; } function totalSupply() public view virtual override returns (uint256) { return super.totalSupply() + _totalSupplyRigid; } function balanceOf(address account) public view virtual override returns (uint256) { if (!containRigidAddress(account)) return super.balanceOf(account); return _balancesRigid[account]; } function allowance(address owner, address spender) public view virtual override returns (uint256) { if (!containRigidAddress(owner)) return super.allowance(owner, spender); return _allowancesRigid[owner][spender]; } function _convertRigidToElasticBalancePartially(address owner, uint256 amount) internal { _totalSupplyRigid -= amount; _balancesRigid[owner] -= amount; uint256 nominal = _convertToNominalWithCaching(amount, Math.Rounding.Up); _lockedNominal -= nominal; _increaseBalanceElastic(owner, nominal); emit ConvertedToElastic(owner, amount, nominal); } function _convertElasticToRigidBalancePartially(address owner, uint256 amount) internal { uint256 nominal = _convertToNominalWithCaching(amount, Math.Rounding.Up); _decreaseBalanceElastic(owner, nominal); _lockedNominal += nominal; _totalSupplyRigid += amount; _balancesRigid[owner] += amount; emit ConvertedToRigid(owner, amount, nominal); } function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); if (containRigidAddress(owner)) { _transferRigid(owner, to, amount); if (!containRigidAddress(to)) _convertRigidToElasticBalancePartially(to, amount); } else { super.transfer(to, amount); if (containRigidAddress(to)) _convertElasticToRigidBalancePartially(to, amount); } return true; } function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); if (!containRigidAddress(owner)) return super.approve(spender, amount); _approveRigid(owner, spender, amount); return true; } function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = _msgSender(); if (containRigidAddress(from)) { _spendAllowanceRigid(from, spender, amount); _transferRigid(from, to, amount); if (!containRigidAddress(to)) _convertRigidToElasticBalancePartially(to, amount); } else { super.transferFrom(from, to, amount); if (containRigidAddress(to)) _convertElasticToRigidBalancePartially(to, amount); } return true; } function increaseAllowance(address spender, uint256 addedValue) public virtual override returns (bool) { address owner = _msgSender(); if (!containRigidAddress(owner)) return super.increaseAllowance(spender, addedValue); _approveRigid(owner, spender, allowance(owner, spender) + addedValue); return true; } function decreaseAllowance(address spender, uint256 subtractedValue) public virtual override returns (bool) { address owner = _msgSender(); if (!containRigidAddress(owner)) return super.decreaseAllowance(spender, subtractedValue); uint256 currentAllowance = allowance(owner, spender); require( currentAllowance >= subtractedValue, 'RigidElasticERC20: decreased allowance below zero' ); unchecked { _approveRigid(owner, spender, currentAllowance - subtractedValue); } return true; } function _transferRigid( address from, address to, uint256 amount ) internal virtual { require(from != address(0), 'RigidElasticERC20: transfer from the zero address'); require(to != address(0), 'RigidElasticERC20: transfer to the zero address'); uint256 fromBalance = _balancesRigid[from]; require(fromBalance >= amount, 'RigidElasticERC20: transfer amount exceeds balance'); unchecked { _balancesRigid[from] = fromBalance - amount; } _balancesRigid[to] += amount; emit Transfer(from, to, amount); } function _approveRigid( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), 'RigidElasticERC20: approve from the zero address'); require(spender != address(0), 'RigidElasticERC20: approve to the zero address'); _allowancesRigid[owner][spender] = amount; emit Approval(owner, spender, amount); } function _spendAllowanceRigid( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, 'RigidElasticERC20: insufficient allowance'); unchecked { _approveRigid(owner, spender, currentAllowance - amount); } } } function _mintElastic( address account, uint256 nominal, uint256 value ) internal virtual override { if (!containRigidAddress(account)) return super._mintElastic(account, nominal, value); revert("RigidElasticERC20: can't be minted"); } function _burnElastic( address account, uint256 nominal, uint256 value ) internal virtual override { if (!containRigidAddress(account)) return super._burnElastic(account, nominal, value); revert("RigidElasticERC20: can't be burned"); } function _decreaseLockedNominalRigidBy(uint256 nominal) internal { _lockedNominal -= nominal; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import '@openzeppelin/contracts/token/ERC20/IERC20.sol'; import '@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol'; /** * @dev OpenZeppelin v4.7.0 IERC4626 fork */ interface IElasticVault is IERC20, IERC20Metadata { event Deposit(address indexed caller, address indexed owner, uint256 value, uint256 nominal); event Withdraw( address indexed caller, address indexed receiver, address indexed owner, uint256 value, uint256 nominal, uint256 fee ); /** * @dev Returns the address of the underlying token used for the Vault for accounting, depositing, and withdrawing. * * - MUST be an ERC-20 token contract. * - MUST NOT revert. */ function asset() external view returns (address assetTokenAddress); /** * @dev Returns the total amount of the underlying asset that is “managed” by Vault. * * - SHOULD include any compounding that occurs from yield. * - MUST be inclusive of any fees that are charged against assets in the Vault. * - MUST NOT revert. */ function totalAssets() external view returns (uint256 totalManagedAssets); /** * @dev Returns the amount of shares that the Vault would exchange for the amount of assets provided, in an ideal * scenario where all the conditions are met. * * - MUST NOT be inclusive of any fees that are charged against assets in the Vault. * - MUST NOT show any variations depending on the caller. * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange. * - MUST NOT revert. * * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and * from. */ function convertToNominal(uint256 value) external view returns (uint256 nominal); /** * @dev Returns the amount of assets that the Vault would exchange for the amount of shares provided, in an ideal * scenario where all the conditions are met. * * - MUST NOT be inclusive of any fees that are charged against assets in the Vault. * - MUST NOT show any variations depending on the caller. * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange. * - MUST NOT revert. * * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and * from. */ function convertToValue(uint256 nominal) external view returns (uint256 value); /** * @dev Returns the maximum amount of the underlying asset that can be deposited into the Vault for the receiver, * through a deposit call. * * - MUST return a limited value if receiver is subject to some deposit limit. * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited. * - MUST NOT revert. */ function maxDeposit(address receiver) external view returns (uint256 maxAssets); /** * @dev Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given * current on-chain conditions. * * - MUST return as close to and no more than the exact amount of Vault shares that would be minted in a deposit * call in the same transaction. I.e. deposit should return the same or more shares as previewDeposit if called * in the same transaction. * - MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the * deposit would be accepted, regardless if the user has enough tokens approved, etc. * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees. * - MUST NOT revert. * * NOTE: any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage in * share price or some other type of condition, meaning the depositor will lose assets by depositing. */ function previewDeposit(uint256 assets) external view returns (uint256 shares); /** * @dev Mints shares Vault shares to receiver by depositing exactly amount of underlying tokens. * * - MUST emit the Deposit event. * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the * deposit execution, and are accounted for during deposit. * - MUST revert if all of assets cannot be deposited (due to deposit limit being reached, slippage, the user not * approving enough underlying tokens to the Vault contract, etc). * * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token. */ function deposit(uint256 assets, address receiver) external returns (uint256 shares); /** * @dev Returns the maximum amount of the underlying asset that can be withdrawn from the owner balance in the * Vault, through a withdraw call. * * - MUST return a limited value if owner is subject to some withdrawal limit or timelock. * - MUST NOT revert. */ function maxWithdraw(address owner) external view returns (uint256 maxAssets); /** * @dev Allows an on-chain or off-chain user to simulate the effects of their withdrawal at the current block, * given current on-chain conditions. * * - MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a withdraw * call in the same transaction. I.e. withdraw should return the same or fewer shares as previewWithdraw if * called * in the same transaction. * - MUST NOT account for withdrawal limits like those returned from maxWithdraw and should always act as though * the withdrawal would be accepted, regardless if the user has enough shares, etc. * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees. * - MUST NOT revert. * * NOTE: any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in * share price or some other type of condition, meaning the depositor will lose assets by depositing. */ function previewWithdraw(uint256 assets) external view returns (uint256 shares); /** * @dev Burns shares from owner and sends exactly assets of underlying tokens to receiver. * * - MUST emit the Withdraw event. * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the * withdraw execution, and are accounted for during withdraw. * - MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner * not having enough shares, etc). * * Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed. * Those methods should be performed separately. */ function withdraw( uint256 assets, address receiver, address owner ) external returns (uint256 shares); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 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. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. It the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. // We also know that `k`, the position of the most significant bit, is such that `msb(a) = 2**k`. // This gives `2**k < a <= 2**(k+1)` → `2**(k/2) <= sqrt(a) < 2 ** (k/2+1)`. // Using an algorithm similar to the msb conmputation, we are able to compute `result = 2**(k/2)` which is a // good first aproximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1; uint256 x = a; if (x >> 128 > 0) { x >>= 128; result <<= 64; } if (x >> 64 > 0) { x >>= 64; result <<= 32; } if (x >> 32 > 0) { x >>= 32; result <<= 16; } if (x >> 16 > 0) { x >>= 16; result <<= 8; } if (x >> 8 > 0) { x >>= 8; result <<= 4; } if (x >> 4 > 0) { x >>= 4; result <<= 2; } if (x >> 2 > 0) { result <<= 1; } // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { uint256 result = sqrt(a); if (rounding == Rounding.Up && result * result < a) { result += 1; } return result; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import '@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol'; import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol'; import '@openzeppelin/contracts/utils/math/Math.sol'; import '@openzeppelin/contracts/utils/Context.sol'; import './PricableAsset.sol'; /** * @dev OpenZeppelin v4.7.0 ERC20 fork */ abstract contract ElasticERC20 is Context, PricableAsset, IERC20Metadata { using Math for uint256; uint8 public constant DEFAULT_DECIMALS = 18; uint256 public constant DEFAULT_DECIMALS_FACTOR = uint256(10)**DEFAULT_DECIMALS; mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } function _convertToNominalWithCaching(uint256 value, Math.Rounding rounding) internal virtual returns (uint256 nominal) { if (value == type(uint256).max) return type(uint256).max; _cacheAssetPriceByBlock(); return value.mulDiv(DEFAULT_DECIMALS_FACTOR, assetPriceCached(), rounding); } function _convertFromNominalWithCaching(uint256 nominal, Math.Rounding rounding) internal virtual returns (uint256 value) { if (nominal == type(uint256).max) return type(uint256).max; _cacheAssetPriceByBlock(); return nominal.mulDiv(assetPriceCached(), DEFAULT_DECIMALS_FACTOR, rounding); } function _convertToNominalCached(uint256 value, Math.Rounding rounding) internal view virtual returns (uint256 nominal) { if (value == type(uint256).max) return type(uint256).max; return value.mulDiv(DEFAULT_DECIMALS_FACTOR, assetPriceCached(), rounding); } function _convertFromNominalCached(uint256 nominal, Math.Rounding rounding) internal view virtual returns (uint256 value) { if (nominal == type(uint256).max) return type(uint256).max; return nominal.mulDiv(assetPriceCached(), DEFAULT_DECIMALS_FACTOR, rounding); } function totalSupplyNominal() public view returns (uint256) { return _totalSupply; } function balanceOfNominal(address account) public view returns (uint256) { return _balances[account]; } function allowanceNominal(address owner, address spender) public view returns (uint256) { return _allowances[owner][spender]; } // IERC20 function name() public view virtual override returns (string memory) { return _name; } function symbol() public view virtual override returns (string memory) { return _symbol; } function decimals() public view virtual override returns (uint8) { return 18; } function totalSupply() public view virtual override returns (uint256) { // don't cache price return _convertFromNominalCached(_totalSupply, Math.Rounding.Down); } function balanceOf(address account) public view virtual override returns (uint256) { // don't cache price return _convertFromNominalCached(_balances[account], Math.Rounding.Down); } function allowance(address owner, address spender) public view virtual override returns (uint256) { return _convertFromNominalCached(_allowances[owner][spender], Math.Rounding.Down); } function transfer(address to, uint256 amount) public virtual override returns (bool) { _transferElastic( _msgSender(), to, _convertToNominalCached(amount, Math.Rounding.Up), amount ); return true; } function approve(address spender, uint256 amount) public virtual override returns (bool) { _approveElastic(_msgSender(), spender, amount); return true; } function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { uint256 nominalAmount = _convertToNominalCached(amount, Math.Rounding.Up); _spendAllowanceElastic(from, _msgSender(), amount); _transferElastic(from, to, nominalAmount, amount); return true; } function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = _msgSender(); _approveElastic(owner, spender, allowance(owner, spender) + addedValue); return true; } function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require( currentAllowance >= subtractedValue, 'ElasticERC20: decreased allowance below zero' ); unchecked { _approveElastic(owner, spender, currentAllowance - subtractedValue); } return true; } function _transferElastic( address from, address to, uint256 nominal, uint256 value ) internal virtual { require(from != address(0), 'ElasticERC20: transfer from the zero address'); require(to != address(0), 'ElasticERC20: transfer to the zero address'); uint256 fromBalance = _balances[from]; require(fromBalance >= nominal, 'ElasticERC20: transfer amount exceeds balance'); unchecked { _balances[from] = fromBalance - nominal; } _balances[to] += nominal; emit Transfer(from, to, value); } function _mintElastic( address account, uint256 nominal, uint256 value ) internal virtual { require(account != address(0), 'ElasticERC20: mint to the zero address'); _totalSupply += nominal; _balances[account] += nominal; emit Transfer(address(0), account, value); } function _burnElastic( address account, uint256 nominal, uint256 value ) internal virtual { require(account != address(0), 'ElasticERC20: burn from the zero address'); uint256 accountBalance = balanceOfNominal(account); require(accountBalance >= nominal, 'ElasticERC20: burn amount exceeds balance'); unchecked { _balances[account] = accountBalance - nominal; } _totalSupply -= nominal; emit Transfer(account, address(0), value); } function _approveElastic( address owner, address spender, uint256 value ) internal virtual { require(owner != address(0), 'ElasticERC20: approve from the zero address'); require(spender != address(0), 'ElasticERC20: approve to the zero address'); _allowances[owner][spender] = _convertToNominalCached(value, Math.Rounding.Up); emit Approval(owner, spender, value); } function _spendAllowanceElastic( address owner, address spender, uint256 value ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= value, 'ElasticERC20: insufficient allowance'); unchecked { _approveElastic(owner, spender, currentAllowance - value); } } } function _increaseBalanceElastic(address account, uint256 nominal) internal { _totalSupply += nominal; _balances[account] += nominal; } function _decreaseBalanceElastic(address account, uint256 nominal) internal { _totalSupply -= nominal; _balances[account] -= nominal; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import './interfaces/IAssetPriceOracle.sol'; abstract contract PricableAsset { uint256 private _blockCached; uint256 private _assetPriceCached; event CachedAssetPrice(uint256 blockNumber, uint256 assetPrice); function assetPriceCacheDuration() public view virtual returns (uint256); function assetPrice() public view virtual returns (uint256); function assetPriceCached() public view virtual returns (uint256) { return _assetPriceCached; } function blockCached() public view virtual returns (uint256) { return _blockCached; } /** * @dev Being the main rebasing mechanism, this function allows anyone to sync cached priced with the oracle by minting needed supply. An arbitrary user can arbitrage by sandwiched trade-rebase-trade operations. Any contracts wanting to support UZD tokens should take into account this possibility of potentially non-synced price. */ function cacheAssetPrice() public virtual { _blockCached = block.number; uint256 currentAssetPrice = assetPrice(); if (_assetPriceCached < currentAssetPrice) { _assetPriceCached = currentAssetPrice; emit CachedAssetPrice(_blockCached, _assetPriceCached); } } function _cacheAssetPriceByBlock() internal virtual { if (block.number >= _blockCached + assetPriceCacheDuration()) { cacheAssetPrice(); } } function _resetPriceCache() internal virtual { _blockCached = 0; _assetPriceCached = 0; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface IAssetPriceOracle { function lpPrice() external view returns (uint256); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol) pragma solidity ^0.8.0; /** * @dev External interface of AccessControl declared to support ERC165 detection. */ interface IAccessControl { /** * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` * * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite * {RoleAdminChanged} not being emitted signaling this. * * _Available since v3.1._ */ event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); /** * @dev Emitted when `account` is granted `role`. * * `sender` is the account that originated the contract call, an admin role * bearer except when using {AccessControl-_setupRole}. */ event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Emitted when `account` is revoked `role`. * * `sender` is the account that originated the contract call: * - if using `revokeRole`, it is the admin role bearer * - if using `renounceRole`, it is the role bearer (i.e. `account`) */ event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) external view returns (bool); /** * @dev Returns the admin role that controls `role`. See {grantRole} and * {revokeRole}. * * To change a role's admin, use {AccessControl-_setRoleAdmin}. */ function getRoleAdmin(bytes32 role) external view returns (bytes32); /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function grantRole(bytes32 role, address account) external; /** * @dev Revokes `role` from `account`. * * If `account` had been granted `role`, emits a {RoleRevoked} event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function revokeRole(bytes32 role, address account) external; /** * @dev Revokes `role` from the calling account. * * Roles are often managed via {grantRole} and {revokeRole}: this function's * purpose is to provide a mechanism for accounts to lose their privileges * if they are compromised (such as when a trusted device is misplaced). * * If the calling account had been granted `role`, emits a {RoleRevoked} * event. * * Requirements: * * - the caller must be `account`. */ function renounceRole(bytes32 role, address account) external; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; uint8 private constant _ADDRESS_LENGTH = 20; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol) pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "metadata": { "useLiteralContent": true }, "libraries": {} }
Contract Security Audit
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Contract Creation Code
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