Contract Source Code:
// 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);
}