ERC-20
Overview
Max Total Supply
309,322.688445 PTaOptUSDC
Holders
19,280
Market
Price
$0.00 @ 0.000000 ETH
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 6 Decimals)
Balance
0 PTaOptUSDCValue
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Contract Name:
Ticket
Compiler Version
v0.8.6+commit.11564f7e
Optimization Enabled:
Yes with 2000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.6; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "./libraries/ExtendedSafeCastLib.sol"; import "./libraries/TwabLib.sol"; import "./interfaces/ITicket.sol"; import "./ControlledToken.sol"; /** * @title PoolTogether V4 Ticket * @author PoolTogether Inc Team * @notice The Ticket extends the standard ERC20 and ControlledToken interfaces with time-weighted average balance functionality. The average balance held by a user between two timestamps can be calculated, as well as the historic balance. The historic total supply is available as well as the average total supply between two timestamps. A user may "delegate" their balance; increasing another user's historic balance while retaining their tokens. */ contract Ticket is ControlledToken, ITicket { using SafeERC20 for IERC20; using ExtendedSafeCastLib for uint256; // solhint-disable-next-line var-name-mixedcase bytes32 private immutable _DELEGATE_TYPEHASH = keccak256("Delegate(address user,address delegate,uint256 nonce,uint256 deadline)"); /// @notice Record of token holders TWABs for each account. mapping(address => TwabLib.Account) internal userTwabs; /// @notice Record of tickets total supply and ring buff parameters used for observation. TwabLib.Account internal totalSupplyTwab; /// @notice Mapping of delegates. Each address can delegate their ticket power to another. mapping(address => address) internal delegates; /* ============ Constructor ============ */ /** * @notice Constructs Ticket with passed parameters. * @param _name ERC20 ticket token name. * @param _symbol ERC20 ticket token symbol. * @param decimals_ ERC20 ticket token decimals. * @param _controller ERC20 ticket controller address (ie: Prize Pool address). */ constructor( string memory _name, string memory _symbol, uint8 decimals_, address _controller ) ControlledToken(_name, _symbol, decimals_, _controller) {} /* ============ External Functions ============ */ /// @inheritdoc ITicket function getAccountDetails(address _user) external view override returns (TwabLib.AccountDetails memory) { return userTwabs[_user].details; } /// @inheritdoc ITicket function getTwab(address _user, uint16 _index) external view override returns (ObservationLib.Observation memory) { return userTwabs[_user].twabs[_index]; } /// @inheritdoc ITicket function getBalanceAt(address _user, uint64 _target) external view override returns (uint256) { TwabLib.Account storage account = userTwabs[_user]; return TwabLib.getBalanceAt( account.twabs, account.details, uint32(_target), uint32(block.timestamp) ); } /// @inheritdoc ITicket function getAverageBalancesBetween( address _user, uint64[] calldata _startTimes, uint64[] calldata _endTimes ) external view override returns (uint256[] memory) { return _getAverageBalancesBetween(userTwabs[_user], _startTimes, _endTimes); } /// @inheritdoc ITicket function getAverageTotalSuppliesBetween( uint64[] calldata _startTimes, uint64[] calldata _endTimes ) external view override returns (uint256[] memory) { return _getAverageBalancesBetween(totalSupplyTwab, _startTimes, _endTimes); } /// @inheritdoc ITicket function getAverageBalanceBetween( address _user, uint64 _startTime, uint64 _endTime ) external view override returns (uint256) { TwabLib.Account storage account = userTwabs[_user]; return TwabLib.getAverageBalanceBetween( account.twabs, account.details, uint32(_startTime), uint32(_endTime), uint32(block.timestamp) ); } /// @inheritdoc ITicket function getBalancesAt(address _user, uint64[] calldata _targets) external view override returns (uint256[] memory) { uint256 length = _targets.length; uint256[] memory _balances = new uint256[](length); TwabLib.Account storage twabContext = userTwabs[_user]; TwabLib.AccountDetails memory details = twabContext.details; for (uint256 i = 0; i < length; i++) { _balances[i] = TwabLib.getBalanceAt( twabContext.twabs, details, uint32(_targets[i]), uint32(block.timestamp) ); } return _balances; } /// @inheritdoc ITicket function getTotalSupplyAt(uint64 _target) external view override returns (uint256) { return TwabLib.getBalanceAt( totalSupplyTwab.twabs, totalSupplyTwab.details, uint32(_target), uint32(block.timestamp) ); } /// @inheritdoc ITicket function getTotalSuppliesAt(uint64[] calldata _targets) external view override returns (uint256[] memory) { uint256 length = _targets.length; uint256[] memory totalSupplies = new uint256[](length); TwabLib.AccountDetails memory details = totalSupplyTwab.details; for (uint256 i = 0; i < length; i++) { totalSupplies[i] = TwabLib.getBalanceAt( totalSupplyTwab.twabs, details, uint32(_targets[i]), uint32(block.timestamp) ); } return totalSupplies; } /// @inheritdoc ITicket function delegateOf(address _user) external view override returns (address) { return delegates[_user]; } /// @inheritdoc ITicket function controllerDelegateFor(address _user, address _to) external override onlyController { _delegate(_user, _to); } /// @inheritdoc ITicket function delegateWithSignature( address _user, address _newDelegate, uint256 _deadline, uint8 _v, bytes32 _r, bytes32 _s ) external virtual override { require(block.timestamp <= _deadline, "Ticket/delegate-expired-deadline"); bytes32 structHash = keccak256(abi.encode(_DELEGATE_TYPEHASH, _user, _newDelegate, _useNonce(_user), _deadline)); bytes32 hash = _hashTypedDataV4(structHash); address signer = ECDSA.recover(hash, _v, _r, _s); require(signer == _user, "Ticket/delegate-invalid-signature"); _delegate(_user, _newDelegate); } /// @inheritdoc ITicket function delegate(address _to) external virtual override { _delegate(msg.sender, _to); } /// @notice Delegates a users chance to another /// @param _user The user whose balance should be delegated /// @param _to The delegate function _delegate(address _user, address _to) internal { uint256 balance = balanceOf(_user); address currentDelegate = delegates[_user]; if (currentDelegate == _to) { return; } delegates[_user] = _to; _transferTwab(currentDelegate, _to, balance); emit Delegated(_user, _to); } /* ============ Internal Functions ============ */ /** * @notice Retrieves the average balances held by a user for a given time frame. * @param _account The user whose balance is checked. * @param _startTimes The start time of the time frame. * @param _endTimes The end time of the time frame. * @return The average balance that the user held during the time frame. */ function _getAverageBalancesBetween( TwabLib.Account storage _account, uint64[] calldata _startTimes, uint64[] calldata _endTimes ) internal view returns (uint256[] memory) { uint256 startTimesLength = _startTimes.length; require(startTimesLength == _endTimes.length, "Ticket/start-end-times-length-match"); TwabLib.AccountDetails memory accountDetails = _account.details; uint256[] memory averageBalances = new uint256[](startTimesLength); uint32 currentTimestamp = uint32(block.timestamp); for (uint256 i = 0; i < startTimesLength; i++) { averageBalances[i] = TwabLib.getAverageBalanceBetween( _account.twabs, accountDetails, uint32(_startTimes[i]), uint32(_endTimes[i]), currentTimestamp ); } return averageBalances; } // @inheritdoc ERC20 function _beforeTokenTransfer(address _from, address _to, uint256 _amount) internal override { if (_from == _to) { return; } address _fromDelegate; if (_from != address(0)) { _fromDelegate = delegates[_from]; } address _toDelegate; if (_to != address(0)) { _toDelegate = delegates[_to]; } _transferTwab(_fromDelegate, _toDelegate, _amount); } /// @notice Transfers the given TWAB balance from one user to another /// @param _from The user to transfer the balance from. May be zero in the event of a mint. /// @param _to The user to transfer the balance to. May be zero in the event of a burn. /// @param _amount The balance that is being transferred. function _transferTwab(address _from, address _to, uint256 _amount) internal { // If we are transferring tokens from a delegated account to an undelegated account if (_from != address(0)) { _decreaseUserTwab(_from, _amount); if (_to == address(0)) { _decreaseTotalSupplyTwab(_amount); } } // If we are transferring tokens from an undelegated account to a delegated account if (_to != address(0)) { _increaseUserTwab(_to, _amount); if (_from == address(0)) { _increaseTotalSupplyTwab(_amount); } } } /** * @notice Increase `_to` TWAB balance. * @param _to Address of the delegate. * @param _amount Amount of tokens to be added to `_to` TWAB balance. */ function _increaseUserTwab( address _to, uint256 _amount ) internal { if (_amount == 0) { return; } TwabLib.Account storage _account = userTwabs[_to]; ( TwabLib.AccountDetails memory accountDetails, ObservationLib.Observation memory twab, bool isNew ) = TwabLib.increaseBalance(_account, _amount.toUint208(), uint32(block.timestamp)); _account.details = accountDetails; if (isNew) { emit NewUserTwab(_to, twab); } } /** * @notice Decrease `_to` TWAB balance. * @param _to Address of the delegate. * @param _amount Amount of tokens to be added to `_to` TWAB balance. */ function _decreaseUserTwab( address _to, uint256 _amount ) internal { if (_amount == 0) { return; } TwabLib.Account storage _account = userTwabs[_to]; ( TwabLib.AccountDetails memory accountDetails, ObservationLib.Observation memory twab, bool isNew ) = TwabLib.decreaseBalance( _account, _amount.toUint208(), "Ticket/twab-burn-lt-balance", uint32(block.timestamp) ); _account.details = accountDetails; if (isNew) { emit NewUserTwab(_to, twab); } } /// @notice Decreases the total supply twab. Should be called anytime a balance moves from delegated to undelegated /// @param _amount The amount to decrease the total by function _decreaseTotalSupplyTwab(uint256 _amount) internal { if (_amount == 0) { return; } ( TwabLib.AccountDetails memory accountDetails, ObservationLib.Observation memory tsTwab, bool tsIsNew ) = TwabLib.decreaseBalance( totalSupplyTwab, _amount.toUint208(), "Ticket/burn-amount-exceeds-total-supply-twab", uint32(block.timestamp) ); totalSupplyTwab.details = accountDetails; if (tsIsNew) { emit NewTotalSupplyTwab(tsTwab); } } /// @notice Increases the total supply twab. Should be called anytime a balance moves from undelegated to delegated /// @param _amount The amount to increase the total by function _increaseTotalSupplyTwab(uint256 _amount) internal { if (_amount == 0) { return; } ( TwabLib.AccountDetails memory accountDetails, ObservationLib.Observation memory _totalSupply, bool tsIsNew ) = TwabLib.increaseBalance(totalSupplyTwab, _amount.toUint208(), uint32(block.timestamp)); totalSupplyTwab.details = accountDetails; if (tsIsNew) { emit NewTotalSupplyTwab(_totalSupply); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @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 `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount ) external returns (bool); /** * @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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.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)); } } /** * @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: GPL-3.0 pragma solidity 0.8.6; /** * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow * checks. * * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can * easily result in undesired exploitation or bugs, since developers usually * assume that overflows raise errors. `SafeCast` restores this intuition by * reverting the transaction when such an operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. * * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing * all math on `uint256` and `int256` and then downcasting. */ library ExtendedSafeCastLib { /** * @dev Returns the downcasted uint104 from uint256, reverting on * overflow (when the input is greater than largest uint104). * * Counterpart to Solidity's `uint104` operator. * * Requirements: * * - input must fit into 104 bits */ function toUint104(uint256 _value) internal pure returns (uint104) { require(_value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits"); return uint104(_value); } /** * @dev Returns the downcasted uint208 from uint256, reverting on * overflow (when the input is greater than largest uint208). * * Counterpart to Solidity's `uint208` operator. * * Requirements: * * - input must fit into 208 bits */ function toUint208(uint256 _value) internal pure returns (uint208) { require(_value <= type(uint208).max, "SafeCast: value doesn't fit in 208 bits"); return uint208(_value); } /** * @dev Returns the downcasted uint224 from uint256, reverting on * overflow (when the input is greater than largest uint224). * * Counterpart to Solidity's `uint224` operator. * * Requirements: * * - input must fit into 224 bits */ function toUint224(uint256 _value) internal pure returns (uint224) { require(_value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits"); return uint224(_value); } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.6; import "./ExtendedSafeCastLib.sol"; import "./OverflowSafeComparatorLib.sol"; import "./RingBufferLib.sol"; import "./ObservationLib.sol"; /** * @title PoolTogether V4 TwabLib (Library) * @author PoolTogether Inc Team * @dev Time-Weighted Average Balance Library for ERC20 tokens. * @notice This TwabLib adds on-chain historical lookups to a user(s) time-weighted average balance. Each user is mapped to an Account struct containing the TWAB history (ring bufffer) and ring buffer parameters. Every token.transfer() creates a new TWAB checkpoint. The new TWAB checkpoint is stored in the circular ring buffer, as either a new checkpoint or rewriting a previous checkpoint with new parameters. The TwabLib (using existing blocktimes 1block/15sec) guarantees minimum 7.4 years of search history. */ library TwabLib { using OverflowSafeComparatorLib for uint32; using ExtendedSafeCastLib for uint256; /** * @notice Sets max ring buffer length in the Account.twabs Observation list. As users transfer/mint/burn tickets new Observation checkpoints are recorded. The current max cardinality guarantees a six month minimum, of historical accurate lookups with current estimates of 1 new block every 15 seconds - the of course contain a transfer to trigger an observation write to storage. * @dev The user Account.AccountDetails.cardinality parameter can NOT exceed the max cardinality variable. Preventing "corrupted" ring buffer lookup pointers and new observation checkpoints. The MAX_CARDINALITY in fact guarantees at least 7.4 years of records: If 14 = block time in seconds (2**24) * 14 = 234881024 seconds of history 234881024 / (365 * 24 * 60 * 60) ~= 7.44 years */ uint24 public constant MAX_CARDINALITY = 16777215; // 2**24 /** @notice Struct ring buffer parameters for single user Account * @param balance Current balance for an Account * @param nextTwabIndex Next uninitialized or updatable ring buffer checkpoint storage slot * @param cardinality Current total "initialized" ring buffer checkpoints for single user AccountDetails. Used to set initial boundary conditions for an efficient binary search. */ struct AccountDetails { uint208 balance; uint24 nextTwabIndex; uint24 cardinality; } /// @notice Combines account details with their twab history /// @param details The account details /// @param twabs The history of twabs for this account struct Account { AccountDetails details; ObservationLib.Observation[MAX_CARDINALITY] twabs; } /// @notice Increases an account's balance and records a new twab. /// @param _account The account whose balance will be increased /// @param _amount The amount to increase the balance by /// @param _currentTime The current time /// @return accountDetails The new AccountDetails /// @return twab The user's latest TWAB /// @return isNew Whether the TWAB is new function increaseBalance( Account storage _account, uint208 _amount, uint32 _currentTime ) internal returns ( AccountDetails memory accountDetails, ObservationLib.Observation memory twab, bool isNew ) { AccountDetails memory _accountDetails = _account.details; (accountDetails, twab, isNew) = _nextTwab(_account.twabs, _accountDetails, _currentTime); accountDetails.balance = _accountDetails.balance + _amount; } /** @notice Calculates the next TWAB checkpoint for an account with a decreasing balance. * @dev With Account struct and amount decreasing calculates the next TWAB observable checkpoint. * @param _account Account whose balance will be decreased * @param _amount Amount to decrease the balance by * @param _revertMessage Revert message for insufficient balance * @return accountDetails Updated Account.details struct * @return twab TWAB observation (with decreasing average) * @return isNew Whether TWAB is new or calling twice in the same block */ function decreaseBalance( Account storage _account, uint208 _amount, string memory _revertMessage, uint32 _currentTime ) internal returns ( AccountDetails memory accountDetails, ObservationLib.Observation memory twab, bool isNew ) { AccountDetails memory _accountDetails = _account.details; require(_accountDetails.balance >= _amount, _revertMessage); (accountDetails, twab, isNew) = _nextTwab(_account.twabs, _accountDetails, _currentTime); unchecked { accountDetails.balance -= _amount; } } /** @notice Calculates the average balance held by a user for a given time frame. * @dev Finds the average balance between start and end timestamp epochs. Validates the supplied end time is within the range of elapsed time i.e. less then timestamp of now. * @param _twabs Individual user Observation recorded checkpoints passed as storage pointer * @param _accountDetails User AccountDetails struct loaded in memory * @param _startTime Start of timestamp range as an epoch * @param _endTime End of timestamp range as an epoch * @param _currentTime Block.timestamp * @return Average balance of user held between epoch timestamps start and end */ function getAverageBalanceBetween( ObservationLib.Observation[MAX_CARDINALITY] storage _twabs, AccountDetails memory _accountDetails, uint32 _startTime, uint32 _endTime, uint32 _currentTime ) internal view returns (uint256) { uint32 endTime = _endTime > _currentTime ? _currentTime : _endTime; return _getAverageBalanceBetween(_twabs, _accountDetails, _startTime, endTime, _currentTime); } /// @notice Retrieves the oldest TWAB /// @param _twabs The storage array of twabs /// @param _accountDetails The TWAB account details /// @return index The index of the oldest TWAB in the twabs array /// @return twab The oldest TWAB function oldestTwab( ObservationLib.Observation[MAX_CARDINALITY] storage _twabs, AccountDetails memory _accountDetails ) internal view returns (uint24 index, ObservationLib.Observation memory twab) { index = _accountDetails.nextTwabIndex; twab = _twabs[index]; // If the TWAB is not initialized we go to the beginning of the TWAB circular buffer at index 0 if (twab.timestamp == 0) { index = 0; twab = _twabs[0]; } } /// @notice Retrieves the newest TWAB /// @param _twabs The storage array of twabs /// @param _accountDetails The TWAB account details /// @return index The index of the newest TWAB in the twabs array /// @return twab The newest TWAB function newestTwab( ObservationLib.Observation[MAX_CARDINALITY] storage _twabs, AccountDetails memory _accountDetails ) internal view returns (uint24 index, ObservationLib.Observation memory twab) { index = uint24(RingBufferLib.newestIndex(_accountDetails.nextTwabIndex, MAX_CARDINALITY)); twab = _twabs[index]; } /// @notice Retrieves amount at `_targetTime` timestamp /// @param _twabs List of TWABs to search through. /// @param _accountDetails Accounts details /// @param _targetTime Timestamp at which the reserved TWAB should be for. /// @return uint256 TWAB amount at `_targetTime`. function getBalanceAt( ObservationLib.Observation[MAX_CARDINALITY] storage _twabs, AccountDetails memory _accountDetails, uint32 _targetTime, uint32 _currentTime ) internal view returns (uint256) { uint32 timeToTarget = _targetTime > _currentTime ? _currentTime : _targetTime; return _getBalanceAt(_twabs, _accountDetails, timeToTarget, _currentTime); } /// @notice Calculates the average balance held by a user for a given time frame. /// @param _startTime The start time of the time frame. /// @param _endTime The end time of the time frame. /// @return The average balance that the user held during the time frame. function _getAverageBalanceBetween( ObservationLib.Observation[MAX_CARDINALITY] storage _twabs, AccountDetails memory _accountDetails, uint32 _startTime, uint32 _endTime, uint32 _currentTime ) private view returns (uint256) { (uint24 oldestTwabIndex, ObservationLib.Observation memory oldTwab) = oldestTwab( _twabs, _accountDetails ); (uint24 newestTwabIndex, ObservationLib.Observation memory newTwab) = newestTwab( _twabs, _accountDetails ); ObservationLib.Observation memory startTwab = _calculateTwab( _twabs, _accountDetails, newTwab, oldTwab, newestTwabIndex, oldestTwabIndex, _startTime, _currentTime ); ObservationLib.Observation memory endTwab = _calculateTwab( _twabs, _accountDetails, newTwab, oldTwab, newestTwabIndex, oldestTwabIndex, _endTime, _currentTime ); // Difference in amount / time return (endTwab.amount - startTwab.amount) / OverflowSafeComparatorLib.checkedSub(endTwab.timestamp, startTwab.timestamp, _currentTime); } /** @notice Searches TWAB history and calculate the difference between amount(s)/timestamp(s) to return average balance between the Observations closes to the supplied targetTime. * @param _twabs Individual user Observation recorded checkpoints passed as storage pointer * @param _accountDetails User AccountDetails struct loaded in memory * @param _targetTime Target timestamp to filter Observations in the ring buffer binary search * @param _currentTime Block.timestamp * @return uint256 Time-weighted average amount between two closest observations. */ function _getBalanceAt( ObservationLib.Observation[MAX_CARDINALITY] storage _twabs, AccountDetails memory _accountDetails, uint32 _targetTime, uint32 _currentTime ) private view returns (uint256) { uint24 newestTwabIndex; ObservationLib.Observation memory afterOrAt; ObservationLib.Observation memory beforeOrAt; (newestTwabIndex, beforeOrAt) = newestTwab(_twabs, _accountDetails); // If `_targetTime` is chronologically after the newest TWAB, we can simply return the current balance if (beforeOrAt.timestamp.lte(_targetTime, _currentTime)) { return _accountDetails.balance; } uint24 oldestTwabIndex; // Now, set before to the oldest TWAB (oldestTwabIndex, beforeOrAt) = oldestTwab(_twabs, _accountDetails); // If `_targetTime` is chronologically before the oldest TWAB, we can early return if (_targetTime.lt(beforeOrAt.timestamp, _currentTime)) { return 0; } // Otherwise, we perform the `binarySearch` (beforeOrAt, afterOrAt) = ObservationLib.binarySearch( _twabs, newestTwabIndex, oldestTwabIndex, _targetTime, _accountDetails.cardinality, _currentTime ); // Sum the difference in amounts and divide by the difference in timestamps. // The time-weighted average balance uses time measured between two epoch timestamps as // a constaint on the measurement when calculating the time weighted average balance. return (afterOrAt.amount - beforeOrAt.amount) / OverflowSafeComparatorLib.checkedSub(afterOrAt.timestamp, beforeOrAt.timestamp, _currentTime); } /** @notice Calculates a user TWAB for a target timestamp using the historical TWAB records. The balance is linearly interpolated: amount differences / timestamp differences using the simple (after.amount - before.amount / end.timestamp - start.timestamp) formula. /** @dev Binary search in _calculateTwab fails when searching out of bounds. Thus, before searching we exclude target timestamps out of range of newest/oldest TWAB(s). IF a search is before or after the range we "extrapolate" a Observation from the expected state. * @param _twabs Individual user Observation recorded checkpoints passed as storage pointer * @param _accountDetails User AccountDetails struct loaded in memory * @param _newestTwab Newest TWAB in history (end of ring buffer) * @param _oldestTwab Olderst TWAB in history (end of ring buffer) * @param _newestTwabIndex Pointer in ring buffer to newest TWAB * @param _oldestTwabIndex Pointer in ring buffer to oldest TWAB * @param _targetTimestamp Epoch timestamp to calculate for time (T) in the TWAB * @param _time Block.timestamp * @return accountDetails Updated Account.details struct */ function _calculateTwab( ObservationLib.Observation[MAX_CARDINALITY] storage _twabs, AccountDetails memory _accountDetails, ObservationLib.Observation memory _newestTwab, ObservationLib.Observation memory _oldestTwab, uint24 _newestTwabIndex, uint24 _oldestTwabIndex, uint32 _targetTimestamp, uint32 _time ) private view returns (ObservationLib.Observation memory) { // If `_targetTimestamp` is chronologically after the newest TWAB, we extrapolate a new one if (_newestTwab.timestamp.lt(_targetTimestamp, _time)) { return _computeNextTwab(_newestTwab, _accountDetails.balance, _targetTimestamp); } if (_newestTwab.timestamp == _targetTimestamp) { return _newestTwab; } if (_oldestTwab.timestamp == _targetTimestamp) { return _oldestTwab; } // If `_targetTimestamp` is chronologically before the oldest TWAB, we create a zero twab if (_targetTimestamp.lt(_oldestTwab.timestamp, _time)) { return ObservationLib.Observation({ amount: 0, timestamp: _targetTimestamp }); } // Otherwise, both timestamps must be surrounded by twabs. ( ObservationLib.Observation memory beforeOrAtStart, ObservationLib.Observation memory afterOrAtStart ) = ObservationLib.binarySearch( _twabs, _newestTwabIndex, _oldestTwabIndex, _targetTimestamp, _accountDetails.cardinality, _time ); uint224 heldBalance = (afterOrAtStart.amount - beforeOrAtStart.amount) / OverflowSafeComparatorLib.checkedSub(afterOrAtStart.timestamp, beforeOrAtStart.timestamp, _time); return _computeNextTwab(beforeOrAtStart, heldBalance, _targetTimestamp); } /** * @notice Calculates the next TWAB using the newestTwab and updated balance. * @dev Storage of the TWAB obersation is managed by the calling function and not _computeNextTwab. * @param _currentTwab Newest Observation in the Account.twabs list * @param _currentBalance User balance at time of most recent (newest) checkpoint write * @param _time Current block.timestamp * @return TWAB Observation */ function _computeNextTwab( ObservationLib.Observation memory _currentTwab, uint224 _currentBalance, uint32 _time ) private pure returns (ObservationLib.Observation memory) { // New twab amount = last twab amount (or zero) + (current amount * elapsed seconds) return ObservationLib.Observation({ amount: _currentTwab.amount + _currentBalance * (_time.checkedSub(_currentTwab.timestamp, _time)), timestamp: _time }); } /// @notice Sets a new TWAB Observation at the next available index and returns the new account details. /// @dev Note that if _currentTime is before the last observation timestamp, it appears as an overflow /// @param _twabs The twabs array to insert into /// @param _accountDetails The current account details /// @param _currentTime The current time /// @return accountDetails The new account details /// @return twab The newest twab (may or may not be brand-new) /// @return isNew Whether the newest twab was created by this call function _nextTwab( ObservationLib.Observation[MAX_CARDINALITY] storage _twabs, AccountDetails memory _accountDetails, uint32 _currentTime ) private returns ( AccountDetails memory accountDetails, ObservationLib.Observation memory twab, bool isNew ) { (, ObservationLib.Observation memory _newestTwab) = newestTwab(_twabs, _accountDetails); // if we're in the same block, return if (_newestTwab.timestamp == _currentTime) { return (_accountDetails, _newestTwab, false); } ObservationLib.Observation memory newTwab = _computeNextTwab( _newestTwab, _accountDetails.balance, _currentTime ); _twabs[_accountDetails.nextTwabIndex] = newTwab; AccountDetails memory nextAccountDetails = push(_accountDetails); return (nextAccountDetails, newTwab, true); } /// @notice "Pushes" a new element on the AccountDetails ring buffer, and returns the new AccountDetails /// @param _accountDetails The account details from which to pull the cardinality and next index /// @return The new AccountDetails function push(AccountDetails memory _accountDetails) internal pure returns (AccountDetails memory) { _accountDetails.nextTwabIndex = uint24( RingBufferLib.nextIndex(_accountDetails.nextTwabIndex, MAX_CARDINALITY) ); // Prevent the Account specific cardinality from exceeding the MAX_CARDINALITY. // The ring buffer length is limited by MAX_CARDINALITY. IF the account.cardinality // exceeds the max cardinality, new observations would be incorrectly set or the // observation would be out of "bounds" of the ring buffer. Once reached the // AccountDetails.cardinality will continue to be equal to max cardinality. if (_accountDetails.cardinality < MAX_CARDINALITY) { _accountDetails.cardinality += 1; } return _accountDetails; } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.6; import "../libraries/TwabLib.sol"; import "./IControlledToken.sol"; interface ITicket is IControlledToken { /** * @notice A struct containing details for an Account. * @param balance The current balance for an Account. * @param nextTwabIndex The next available index to store a new twab. * @param cardinality The number of recorded twabs (plus one!). */ struct AccountDetails { uint224 balance; uint16 nextTwabIndex; uint16 cardinality; } /** * @notice Combines account details with their twab history. * @param details The account details. * @param twabs The history of twabs for this account. */ struct Account { AccountDetails details; ObservationLib.Observation[65535] twabs; } /** * @notice Emitted when TWAB balance has been delegated to another user. * @param delegator Address of the delegator. * @param delegate Address of the delegate. */ event Delegated(address indexed delegator, address indexed delegate); /** * @notice Emitted when ticket is initialized. * @param name Ticket name (eg: PoolTogether Dai Ticket (Compound)). * @param symbol Ticket symbol (eg: PcDAI). * @param decimals Ticket decimals. * @param controller Token controller address. */ event TicketInitialized(string name, string symbol, uint8 decimals, address indexed controller); /** * @notice Emitted when a new TWAB has been recorded. * @param delegate The recipient of the ticket power (may be the same as the user). * @param newTwab Updated TWAB of a ticket holder after a successful TWAB recording. */ event NewUserTwab( address indexed delegate, ObservationLib.Observation newTwab ); /** * @notice Emitted when a new total supply TWAB has been recorded. * @param newTotalSupplyTwab Updated TWAB of tickets total supply after a successful total supply TWAB recording. */ event NewTotalSupplyTwab(ObservationLib.Observation newTotalSupplyTwab); /** * @notice Retrieves the address of the delegate to whom `user` has delegated their tickets. * @dev Address of the delegate will be the zero address if `user` has not delegated their tickets. * @param user Address of the delegator. * @return Address of the delegate. */ function delegateOf(address user) external view returns (address); /** * @notice Delegate time-weighted average balances to an alternative address. * @dev Transfers (including mints) trigger the storage of a TWAB in delegate(s) account, instead of the targetted sender and/or recipient address(s). * @dev To reset the delegate, pass the zero address (0x000.000) as `to` parameter. * @dev Current delegate address should be different from the new delegate address `to`. * @param to Recipient of delegated TWAB. */ function delegate(address to) external; /** * @notice Allows the controller to delegate on a users behalf. * @param user The user for whom to delegate * @param delegate The new delegate */ function controllerDelegateFor(address user, address delegate) external; /** * @notice Allows a user to delegate via signature * @param user The user who is delegating * @param delegate The new delegate * @param deadline The timestamp by which this must be submitted * @param v The v portion of the ECDSA sig * @param r The r portion of the ECDSA sig * @param s The s portion of the ECDSA sig */ function delegateWithSignature( address user, address delegate, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @notice Gets a users twab context. This is a struct with their balance, next twab index, and cardinality. * @param user The user for whom to fetch the TWAB context. * @return The TWAB context, which includes { balance, nextTwabIndex, cardinality } */ function getAccountDetails(address user) external view returns (TwabLib.AccountDetails memory); /** * @notice Gets the TWAB at a specific index for a user. * @param user The user for whom to fetch the TWAB. * @param index The index of the TWAB to fetch. * @return The TWAB, which includes the twab amount and the timestamp. */ function getTwab(address user, uint16 index) external view returns (ObservationLib.Observation memory); /** * @notice Retrieves `user` TWAB balance. * @param user Address of the user whose TWAB is being fetched. * @param timestamp Timestamp at which we want to retrieve the TWAB balance. * @return The TWAB balance at the given timestamp. */ function getBalanceAt(address user, uint64 timestamp) external view returns (uint256); /** * @notice Retrieves `user` TWAB balances. * @param user Address of the user whose TWABs are being fetched. * @param timestamps Timestamps range at which we want to retrieve the TWAB balances. * @return `user` TWAB balances. */ function getBalancesAt(address user, uint64[] calldata timestamps) external view returns (uint256[] memory); /** * @notice Retrieves the average balance held by a user for a given time frame. * @param user The user whose balance is checked. * @param startTime The start time of the time frame. * @param endTime The end time of the time frame. * @return The average balance that the user held during the time frame. */ function getAverageBalanceBetween( address user, uint64 startTime, uint64 endTime ) external view returns (uint256); /** * @notice Retrieves the average balances held by a user for a given time frame. * @param user The user whose balance is checked. * @param startTimes The start time of the time frame. * @param endTimes The end time of the time frame. * @return The average balance that the user held during the time frame. */ function getAverageBalancesBetween( address user, uint64[] calldata startTimes, uint64[] calldata endTimes ) external view returns (uint256[] memory); /** * @notice Retrieves the total supply TWAB balance at the given timestamp. * @param timestamp Timestamp at which we want to retrieve the total supply TWAB balance. * @return The total supply TWAB balance at the given timestamp. */ function getTotalSupplyAt(uint64 timestamp) external view returns (uint256); /** * @notice Retrieves the total supply TWAB balance between the given timestamps range. * @param timestamps Timestamps range at which we want to retrieve the total supply TWAB balance. * @return Total supply TWAB balances. */ function getTotalSuppliesAt(uint64[] calldata timestamps) external view returns (uint256[] memory); /** * @notice Retrieves the average total supply balance for a set of given time frames. * @param startTimes Array of start times. * @param endTimes Array of end times. * @return The average total supplies held during the time frame. */ function getAverageTotalSuppliesBetween( uint64[] calldata startTimes, uint64[] calldata endTimes ) external view returns (uint256[] memory); }
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.6; import "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol"; import "./interfaces/IControlledToken.sol"; /** * @title PoolTogether V4 Controlled ERC20 Token * @author PoolTogether Inc Team * @notice ERC20 Tokens with a controller for minting & burning */ contract ControlledToken is ERC20Permit, IControlledToken { /* ============ Global Variables ============ */ /// @notice Interface to the contract responsible for controlling mint/burn address public override immutable controller; /// @notice ERC20 controlled token decimals. uint8 private immutable _decimals; /* ============ Events ============ */ /// @dev Emitted when contract is deployed event Deployed(string name, string symbol, uint8 decimals, address indexed controller); /* ============ Modifiers ============ */ /// @dev Function modifier to ensure that the caller is the controller contract modifier onlyController() { require(msg.sender == address(controller), "ControlledToken/only-controller"); _; } /* ============ Constructor ============ */ /// @notice Deploy the Controlled Token with Token Details and the Controller /// @param _name The name of the Token /// @param _symbol The symbol for the Token /// @param decimals_ The number of decimals for the Token /// @param _controller Address of the Controller contract for minting & burning constructor( string memory _name, string memory _symbol, uint8 decimals_, address _controller ) ERC20Permit("PoolTogether ControlledToken") ERC20(_name, _symbol) { require(address(_controller) != address(0), "ControlledToken/controller-not-zero-address"); controller = _controller; require(decimals_ > 0, "ControlledToken/decimals-gt-zero"); _decimals = decimals_; emit Deployed(_name, _symbol, decimals_, _controller); } /* ============ External Functions ============ */ /// @notice Allows the controller to mint tokens for a user account /// @dev May be overridden to provide more granular control over minting /// @param _user Address of the receiver of the minted tokens /// @param _amount Amount of tokens to mint function controllerMint(address _user, uint256 _amount) external virtual override onlyController { _mint(_user, _amount); } /// @notice Allows the controller to burn tokens from a user account /// @dev May be overridden to provide more granular control over burning /// @param _user Address of the holder account to burn tokens from /// @param _amount Amount of tokens to burn function controllerBurn(address _user, uint256 _amount) external virtual override onlyController { _burn(_user, _amount); } /// @notice Allows an operator via the controller to burn tokens on behalf of a user account /// @dev May be overridden to provide more granular control over operator-burning /// @param _operator Address of the operator performing the burn action via the controller contract /// @param _user Address of the holder account to burn tokens from /// @param _amount Amount of tokens to burn function controllerBurnFrom( address _operator, address _user, uint256 _amount ) external virtual override onlyController { if (_operator != _user) { _approve(_user, _operator, allowance(_user, _operator) - _amount); } _burn(_user, _amount); } /// @notice Returns the ERC20 controlled token decimals. /// @dev This value should be equal to the decimals of the token used to deposit into the pool. /// @return uint8 decimals. function decimals() public view virtual override returns (uint8) { return _decimals; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Address.sol) pragma solidity ^0.8.0; /** * @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 * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.6; /// @title OverflowSafeComparatorLib library to share comparator functions between contracts /// @dev Code taken from Uniswap V3 Oracle.sol: https://github.com/Uniswap/v3-core/blob/3e88af408132fc957e3e406f65a0ce2b1ca06c3d/contracts/libraries/Oracle.sol /// @author PoolTogether Inc. library OverflowSafeComparatorLib { /// @notice 32-bit timestamps comparator. /// @dev safe for 0 or 1 overflows, `_a` and `_b` must be chronologically before or equal to time. /// @param _a A comparison timestamp from which to determine the relative position of `_timestamp`. /// @param _b Timestamp to compare against `_a`. /// @param _timestamp A timestamp truncated to 32 bits. /// @return bool Whether `_a` is chronologically < `_b`. function lt( uint32 _a, uint32 _b, uint32 _timestamp ) internal pure returns (bool) { // No need to adjust if there hasn't been an overflow if (_a <= _timestamp && _b <= _timestamp) return _a < _b; uint256 aAdjusted = _a > _timestamp ? _a : _a + 2**32; uint256 bAdjusted = _b > _timestamp ? _b : _b + 2**32; return aAdjusted < bAdjusted; } /// @notice 32-bit timestamps comparator. /// @dev safe for 0 or 1 overflows, `_a` and `_b` must be chronologically before or equal to time. /// @param _a A comparison timestamp from which to determine the relative position of `_timestamp`. /// @param _b Timestamp to compare against `_a`. /// @param _timestamp A timestamp truncated to 32 bits. /// @return bool Whether `_a` is chronologically <= `_b`. function lte( uint32 _a, uint32 _b, uint32 _timestamp ) internal pure returns (bool) { // No need to adjust if there hasn't been an overflow if (_a <= _timestamp && _b <= _timestamp) return _a <= _b; uint256 aAdjusted = _a > _timestamp ? _a : _a + 2**32; uint256 bAdjusted = _b > _timestamp ? _b : _b + 2**32; return aAdjusted <= bAdjusted; } /// @notice 32-bit timestamp subtractor /// @dev safe for 0 or 1 overflows, where `_a` and `_b` must be chronologically before or equal to time /// @param _a The subtraction left operand /// @param _b The subtraction right operand /// @param _timestamp The current time. Expected to be chronologically after both. /// @return The difference between a and b, adjusted for overflow function checkedSub( uint32 _a, uint32 _b, uint32 _timestamp ) internal pure returns (uint32) { // No need to adjust if there hasn't been an overflow if (_a <= _timestamp && _b <= _timestamp) return _a - _b; uint256 aAdjusted = _a > _timestamp ? _a : _a + 2**32; uint256 bAdjusted = _b > _timestamp ? _b : _b + 2**32; return uint32(aAdjusted - bAdjusted); } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.6; library RingBufferLib { /** * @notice Returns wrapped TWAB index. * @dev In order to navigate the TWAB circular buffer, we need to use the modulo operator. * @dev For example, if `_index` is equal to 32 and the TWAB circular buffer is of `_cardinality` 32, * it will return 0 and will point to the first element of the array. * @param _index Index used to navigate through the TWAB circular buffer. * @param _cardinality TWAB buffer cardinality. * @return TWAB index. */ function wrap(uint256 _index, uint256 _cardinality) internal pure returns (uint256) { return _index % _cardinality; } /** * @notice Computes the negative offset from the given index, wrapped by the cardinality. * @dev We add `_cardinality` to `_index` to be able to offset even if `_amount` is superior to `_cardinality`. * @param _index The index from which to offset * @param _amount The number of indices to offset. This is subtracted from the given index. * @param _cardinality The number of elements in the ring buffer * @return Offsetted index. */ function offset( uint256 _index, uint256 _amount, uint256 _cardinality ) internal pure returns (uint256) { return wrap(_index + _cardinality - _amount, _cardinality); } /// @notice Returns the index of the last recorded TWAB /// @param _nextIndex The next available twab index. This will be recorded to next. /// @param _cardinality The cardinality of the TWAB history. /// @return The index of the last recorded TWAB function newestIndex(uint256 _nextIndex, uint256 _cardinality) internal pure returns (uint256) { if (_cardinality == 0) { return 0; } return wrap(_nextIndex + _cardinality - 1, _cardinality); } /// @notice Computes the ring buffer index that follows the given one, wrapped by cardinality /// @param _index The index to increment /// @param _cardinality The number of elements in the Ring Buffer /// @return The next index relative to the given index. Will wrap around to 0 if the next index == cardinality function nextIndex(uint256 _index, uint256 _cardinality) internal pure returns (uint256) { return wrap(_index + 1, _cardinality); } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.6; import "@openzeppelin/contracts/utils/math/SafeCast.sol"; import "./OverflowSafeComparatorLib.sol"; import "./RingBufferLib.sol"; /** * @title Observation Library * @notice This library allows one to store an array of timestamped values and efficiently binary search them. * @dev Largely pulled from Uniswap V3 Oracle.sol: https://github.com/Uniswap/v3-core/blob/c05a0e2c8c08c460fb4d05cfdda30b3ad8deeaac/contracts/libraries/Oracle.sol * @author PoolTogether Inc. */ library ObservationLib { using OverflowSafeComparatorLib for uint32; using SafeCast for uint256; /// @notice The maximum number of observations uint24 public constant MAX_CARDINALITY = 16777215; // 2**24 /** * @notice Observation, which includes an amount and timestamp. * @param amount `amount` at `timestamp`. * @param timestamp Recorded `timestamp`. */ struct Observation { uint224 amount; uint32 timestamp; } /** * @notice Fetches Observations `beforeOrAt` and `atOrAfter` a `_target`, eg: where [`beforeOrAt`, `atOrAfter`] is satisfied. * The result may be the same Observation, or adjacent Observations. * @dev The answer must be contained in the array used when the target is located within the stored Observation. * boundaries: older than the most recent Observation and younger, or the same age as, the oldest Observation. * @dev If `_newestObservationIndex` is less than `_oldestObservationIndex`, it means that we've wrapped around the circular buffer. * So the most recent observation will be at `_oldestObservationIndex + _cardinality - 1`, at the beginning of the circular buffer. * @param _observations List of Observations to search through. * @param _newestObservationIndex Index of the newest Observation. Right side of the circular buffer. * @param _oldestObservationIndex Index of the oldest Observation. Left side of the circular buffer. * @param _target Timestamp at which we are searching the Observation. * @param _cardinality Cardinality of the circular buffer we are searching through. * @param _time Timestamp at which we perform the binary search. * @return beforeOrAt Observation recorded before, or at, the target. * @return atOrAfter Observation recorded at, or after, the target. */ function binarySearch( Observation[MAX_CARDINALITY] storage _observations, uint24 _newestObservationIndex, uint24 _oldestObservationIndex, uint32 _target, uint24 _cardinality, uint32 _time ) internal view returns (Observation memory beforeOrAt, Observation memory atOrAfter) { uint256 leftSide = _oldestObservationIndex; uint256 rightSide = _newestObservationIndex < leftSide ? leftSide + _cardinality - 1 : _newestObservationIndex; uint256 currentIndex; while (true) { // We start our search in the middle of the `leftSide` and `rightSide`. // After each iteration, we narrow down the search to the left or the right side while still starting our search in the middle. currentIndex = (leftSide + rightSide) / 2; beforeOrAt = _observations[uint24(RingBufferLib.wrap(currentIndex, _cardinality))]; uint32 beforeOrAtTimestamp = beforeOrAt.timestamp; // We've landed on an uninitialized timestamp, keep searching higher (more recently). if (beforeOrAtTimestamp == 0) { leftSide = currentIndex + 1; continue; } atOrAfter = _observations[uint24(RingBufferLib.nextIndex(currentIndex, _cardinality))]; bool targetAtOrAfter = beforeOrAtTimestamp.lte(_target, _time); // Check if we've found the corresponding Observation. if (targetAtOrAfter && _target.lte(atOrAfter.timestamp, _time)) { break; } // If `beforeOrAtTimestamp` is greater than `_target`, then we keep searching lower. To the left of the current index. if (!targetAtOrAfter) { rightSide = currentIndex - 1; } else { // Otherwise, we keep searching higher. To the left of the current index. leftSide = currentIndex + 1; } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/math/SafeCast.sol) pragma solidity ^0.8.0; /** * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow * checks. * * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can * easily result in undesired exploitation or bugs, since developers usually * assume that overflows raise errors. `SafeCast` restores this intuition by * reverting the transaction when such an operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. * * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing * all math on `uint256` and `int256` and then downcasting. */ library SafeCast { /** * @dev Returns the downcasted uint224 from uint256, reverting on * overflow (when the input is greater than largest uint224). * * Counterpart to Solidity's `uint224` operator. * * Requirements: * * - input must fit into 224 bits */ function toUint224(uint256 value) internal pure returns (uint224) { require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits"); return uint224(value); } /** * @dev Returns the downcasted uint128 from uint256, reverting on * overflow (when the input is greater than largest uint128). * * Counterpart to Solidity's `uint128` operator. * * Requirements: * * - input must fit into 128 bits */ function toUint128(uint256 value) internal pure returns (uint128) { require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits"); return uint128(value); } /** * @dev Returns the downcasted uint96 from uint256, reverting on * overflow (when the input is greater than largest uint96). * * Counterpart to Solidity's `uint96` operator. * * Requirements: * * - input must fit into 96 bits */ function toUint96(uint256 value) internal pure returns (uint96) { require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits"); return uint96(value); } /** * @dev Returns the downcasted uint64 from uint256, reverting on * overflow (when the input is greater than largest uint64). * * Counterpart to Solidity's `uint64` operator. * * Requirements: * * - input must fit into 64 bits */ function toUint64(uint256 value) internal pure returns (uint64) { require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits"); return uint64(value); } /** * @dev Returns the downcasted uint32 from uint256, reverting on * overflow (when the input is greater than largest uint32). * * Counterpart to Solidity's `uint32` operator. * * Requirements: * * - input must fit into 32 bits */ function toUint32(uint256 value) internal pure returns (uint32) { require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits"); return uint32(value); } /** * @dev Returns the downcasted uint16 from uint256, reverting on * overflow (when the input is greater than largest uint16). * * Counterpart to Solidity's `uint16` operator. * * Requirements: * * - input must fit into 16 bits */ function toUint16(uint256 value) internal pure returns (uint16) { require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits"); return uint16(value); } /** * @dev Returns the downcasted uint8 from uint256, reverting on * overflow (when the input is greater than largest uint8). * * Counterpart to Solidity's `uint8` operator. * * Requirements: * * - input must fit into 8 bits. */ function toUint8(uint256 value) internal pure returns (uint8) { require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits"); return uint8(value); } /** * @dev Converts a signed int256 into an unsigned uint256. * * Requirements: * * - input must be greater than or equal to 0. */ function toUint256(int256 value) internal pure returns (uint256) { require(value >= 0, "SafeCast: value must be positive"); return uint256(value); } /** * @dev Returns the downcasted int128 from int256, reverting on * overflow (when the input is less than smallest int128 or * greater than largest int128). * * Counterpart to Solidity's `int128` operator. * * Requirements: * * - input must fit into 128 bits * * _Available since v3.1._ */ function toInt128(int256 value) internal pure returns (int128) { require(value >= type(int128).min && value <= type(int128).max, "SafeCast: value doesn't fit in 128 bits"); return int128(value); } /** * @dev Returns the downcasted int64 from int256, reverting on * overflow (when the input is less than smallest int64 or * greater than largest int64). * * Counterpart to Solidity's `int64` operator. * * Requirements: * * - input must fit into 64 bits * * _Available since v3.1._ */ function toInt64(int256 value) internal pure returns (int64) { require(value >= type(int64).min && value <= type(int64).max, "SafeCast: value doesn't fit in 64 bits"); return int64(value); } /** * @dev Returns the downcasted int32 from int256, reverting on * overflow (when the input is less than smallest int32 or * greater than largest int32). * * Counterpart to Solidity's `int32` operator. * * Requirements: * * - input must fit into 32 bits * * _Available since v3.1._ */ function toInt32(int256 value) internal pure returns (int32) { require(value >= type(int32).min && value <= type(int32).max, "SafeCast: value doesn't fit in 32 bits"); return int32(value); } /** * @dev Returns the downcasted int16 from int256, reverting on * overflow (when the input is less than smallest int16 or * greater than largest int16). * * Counterpart to Solidity's `int16` operator. * * Requirements: * * - input must fit into 16 bits * * _Available since v3.1._ */ function toInt16(int256 value) internal pure returns (int16) { require(value >= type(int16).min && value <= type(int16).max, "SafeCast: value doesn't fit in 16 bits"); return int16(value); } /** * @dev Returns the downcasted int8 from int256, reverting on * overflow (when the input is less than smallest int8 or * greater than largest int8). * * Counterpart to Solidity's `int8` operator. * * Requirements: * * - input must fit into 8 bits. * * _Available since v3.1._ */ function toInt8(int256 value) internal pure returns (int8) { require(value >= type(int8).min && value <= type(int8).max, "SafeCast: value doesn't fit in 8 bits"); return int8(value); } /** * @dev Converts an unsigned uint256 into a signed int256. * * Requirements: * * - input must be less than or equal to maxInt256. */ function toInt256(uint256 value) internal pure returns (int256) { // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256"); return int256(value); } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.6; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; /** @title IControlledToken * @author PoolTogether Inc Team * @notice ERC20 Tokens with a controller for minting & burning. */ interface IControlledToken is IERC20 { /** @notice Interface to the contract responsible for controlling mint/burn */ function controller() external view returns (address); /** * @notice Allows the controller to mint tokens for a user account * @dev May be overridden to provide more granular control over minting * @param user Address of the receiver of the minted tokens * @param amount Amount of tokens to mint */ function controllerMint(address user, uint256 amount) external; /** * @notice Allows the controller to burn tokens from a user account * @dev May be overridden to provide more granular control over burning * @param user Address of the holder account to burn tokens from * @param amount Amount of tokens to burn */ function controllerBurn(address user, uint256 amount) external; /** * @notice Allows an operator via the controller to burn tokens on behalf of a user account * @dev May be overridden to provide more granular control over operator-burning * @param operator Address of the operator performing the burn action via the controller contract * @param user Address of the holder account to burn tokens from * @param amount Amount of tokens to burn */ function controllerBurnFrom( address operator, address user, uint256 amount ) external; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-ERC20Permit.sol) pragma solidity ^0.8.0; import "./draft-IERC20Permit.sol"; import "../ERC20.sol"; import "../../../utils/cryptography/draft-EIP712.sol"; import "../../../utils/cryptography/ECDSA.sol"; import "../../../utils/Counters.sol"; /** * @dev Implementation 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. * * _Available since v3.4._ */ abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 { using Counters for Counters.Counter; mapping(address => Counters.Counter) private _nonces; // solhint-disable-next-line var-name-mixedcase bytes32 private immutable _PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); /** * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`. * * It's a good idea to use the same `name` that is defined as the ERC20 token name. */ constructor(string memory name) EIP712(name, "1") {} /** * @dev See {IERC20Permit-permit}. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual override { require(block.timestamp <= deadline, "ERC20Permit: expired deadline"); bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline)); bytes32 hash = _hashTypedDataV4(structHash); address signer = ECDSA.recover(hash, v, r, s); require(signer == owner, "ERC20Permit: invalid signature"); _approve(owner, spender, value); } /** * @dev See {IERC20Permit-nonces}. */ function nonces(address owner) public view virtual override returns (uint256) { return _nonces[owner].current(); } /** * @dev See {IERC20Permit-DOMAIN_SEPARATOR}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view override returns (bytes32) { return _domainSeparatorV4(); } /** * @dev "Consume a nonce": return the current value and increment. * * _Available since v4.1._ */ function _useNonce(address owner) internal virtual returns (uint256 current) { Counters.Counter storage nonce = _nonces[owner]; current = nonce.current(); nonce.increment(); } }
// 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 // OpenZeppelin Contracts v4.4.1 (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); unchecked { _approve(sender, _msgSender(), currentAllowance - amount); } return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(_msgSender(), spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `sender` to `recipient`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[sender] = senderBalance - amount; } _balances[recipient] += amount; emit Transfer(sender, recipient, amount); _afterTokenTransfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol) pragma solidity ^0.8.0; import "./ECDSA.sol"; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712 { /* solhint-disable var-name-mixedcase */ // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to // invalidate the cached domain separator if the chain id changes. bytes32 private immutable _CACHED_DOMAIN_SEPARATOR; uint256 private immutable _CACHED_CHAIN_ID; address private immutable _CACHED_THIS; bytes32 private immutable _HASHED_NAME; bytes32 private immutable _HASHED_VERSION; bytes32 private immutable _TYPE_HASH; /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ constructor(string memory name, string memory version) { bytes32 hashedName = keccak256(bytes(name)); bytes32 hashedVersion = keccak256(bytes(version)); bytes32 typeHash = keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" ); _HASHED_NAME = hashedName; _HASHED_VERSION = hashedVersion; _CACHED_CHAIN_ID = block.chainid; _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion); _CACHED_THIS = address(this); _TYPE_HASH = typeHash; } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view returns (bytes32) { if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) { return _CACHED_DOMAIN_SEPARATOR; } else { return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION); } } function _buildDomainSeparator( bytes32 typeHash, bytes32 nameHash, bytes32 versionHash ) private view returns (bytes32) { return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this))); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol) pragma solidity ^0.8.0; import "../Strings.sol"; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } else if (error == RecoverError.InvalidSignatureV) { revert("ECDSA: invalid signature 'v' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else if (signature.length == 64) { bytes32 r; bytes32 vs; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) vs := mload(add(signature, 0x40)) } return tryRecover(hash, r, vs); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s; uint8 v; assembly { s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) v := add(shr(255, vs), 27) } return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } if (v != 27 && v != 28) { return (address(0), RecoverError.InvalidSignatureV); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Message, created from `s`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Counters.sol) pragma solidity ^0.8.0; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` */ library Counters { struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { unchecked { counter._value += 1; } } function decrement(Counter storage counter) internal { uint256 value = counter._value; require(value > 0, "Counter: decrement overflow"); unchecked { counter._value = value - 1; } } function reset(Counter storage counter) internal { counter._value = 0; } }
// 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 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 // OpenZeppelin Contracts v4.4.1 (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
{ "optimizer": { "enabled": true, "runs": 2000 }, "evmVersion": "berlin", "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "metadata": { "useLiteralContent": true }, "libraries": {} }
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ObservationLib.Observation","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000000600000000000000000000000079bc8bd53244bc8a9c8c27509a2d573650a83373000000000000000000000000000000000000000000000000000000000000001c506f6f6c546f67657468657220614f707455534443205469636b657400000000000000000000000000000000000000000000000000000000000000000000000a5054614f70745553444300000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _name (string): PoolTogether aOptUSDC Ticket
Arg [1] : _symbol (string): PTaOptUSDC
Arg [2] : decimals_ (uint8): 6
Arg [3] : _controller (address): 0x79Bc8bD53244bC8a9C8c27509a2d573650A83373
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [3] : 00000000000000000000000079bc8bd53244bc8a9c8c27509a2d573650a83373
Arg [4] : 000000000000000000000000000000000000000000000000000000000000001c
Arg [5] : 506f6f6c546f67657468657220614f707455534443205469636b657400000000
Arg [6] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [7] : 5054614f70745553444300000000000000000000000000000000000000000000
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[ Download: CSV Export ]
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