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ContractCreator
TokenTracker
Latest 25 from a total of 146 transactions
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Get Reward | 21821850 | 27 hrs ago | IN | 0 ETH | 0.00012303 | ||||
Get Reward | 21748302 | 11 days ago | IN | 0 ETH | 0.00047331 | ||||
Deposit | 21748289 | 11 days ago | IN | 0 ETH | 0.00060554 | ||||
Get Reward | 21722401 | 15 days ago | IN | 0 ETH | 0.00054991 | ||||
Withdraw | 21722388 | 15 days ago | IN | 0 ETH | 0.0007859 | ||||
Get Reward | 21707091 | 17 days ago | IN | 0 ETH | 0.00033841 | ||||
Get Reward | 21707055 | 17 days ago | IN | 0 ETH | 0.0003023 | ||||
Get Reward | 21690348 | 19 days ago | IN | 0 ETH | 0.0014065 | ||||
Get Reward | 21644018 | 25 days ago | IN | 0 ETH | 0.00112778 | ||||
Get Reward | 21479060 | 49 days ago | IN | 0 ETH | 0.00074759 | ||||
Withdraw | 21470492 | 50 days ago | IN | 0 ETH | 0.00084665 | ||||
Get Reward | 21469737 | 50 days ago | IN | 0 ETH | 0.00077253 | ||||
Deposit | 21458639 | 51 days ago | IN | 0 ETH | 0.00180815 | ||||
Withdraw | 21458604 | 51 days ago | IN | 0 ETH | 0.00133458 | ||||
Deposit | 21427589 | 56 days ago | IN | 0 ETH | 0.00143606 | ||||
Withdraw | 21423772 | 56 days ago | IN | 0 ETH | 0.00414604 | ||||
Get Reward | 21422239 | 56 days ago | IN | 0 ETH | 0.00161651 | ||||
Get Reward | 21399056 | 60 days ago | IN | 0 ETH | 0.00082283 | ||||
Get Reward | 21399054 | 60 days ago | IN | 0 ETH | 0.00094652 | ||||
Deposit | 21344951 | 67 days ago | IN | 0 ETH | 0.00415926 | ||||
Withdraw | 21344873 | 67 days ago | IN | 0 ETH | 0.00485877 | ||||
Withdraw | 21334640 | 69 days ago | IN | 0 ETH | 0.00286781 | ||||
Get Reward | 21297737 | 74 days ago | IN | 0 ETH | 0.00083465 | ||||
Get Reward | 21270256 | 78 days ago | IN | 0 ETH | 0.00100578 | ||||
Get Reward | 21241803 | 82 days ago | IN | 0 ETH | 0.00121681 |
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Contract Source Code Verified (Exact Match)
Contract Name:
Gauge
Compiler Version
v0.8.15+commit.e14f2714
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.15; import "./interfaces/IExtraReward.sol"; import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/utils/math/Math.sol"; import "./interfaces/IGauge.sol"; import "./BaseGauge.sol"; import "./interfaces/IVotingYFI.sol"; import "./interfaces/IDYfiRewardPool.sol"; /** @title Gauge stake vault token get YFI rewards @notice Deposit your vault token (one gauge per vault). YFI are paid based on the number of vault tokens, the veYFI balance, and the duration of the lock. @dev this contract is used behind multiple delegate proxies. */ contract Gauge is BaseGauge, ERC20Upgradeable, IGauge { using SafeERC20 for IERC20; struct Balance { uint256 realBalance; uint256 boostedBalance; } struct Approved { bool claim; bool lock; } uint256 public constant BOOSTING_FACTOR = 1; uint256 public constant BOOST_DENOMINATOR = 10; IERC20 public asset; //// @notice veYFI address public immutable VEYFI; //// @notice the veYFI YFI reward pool, penalty are sent to this contract. address public immutable VE_YFI_POOL; //// @notice a copy of the veYFI max lock duration uint256 public constant PRECISION_FACTOR = 10 ** 18; //// @notice Penalty does not apply for locks expiring after 3y11m mapping(address => uint256) private _boostedBalances; mapping(address => address) public recipients; event TransferredPenalty(address indexed account, uint256 transfered); event BoostedBalanceUpdated(address account, uint256 amount); event Initialize(address indexed asset, address indexed owner); event RecipientUpdated(address indexed account, address indexed recipient); constructor( address _veYfi, address _dYfi, address _veYfiDYfiPool ) BaseGauge(_dYfi) { require(_veYfi != address(0x0), "_asset 0x0 address"); require(_veYfiDYfiPool != address(0x0), "_asset 0x0 address"); VEYFI = _veYfi; VE_YFI_POOL = _veYfiDYfiPool; } /** @notice initialize the contract * @dev Initialize called after contract is cloned. * @param _asset The vault token to stake * @param _owner owner address */ function initialize(address _asset, address _owner) external initializer { __initialize(_owner); asset = IERC20(_asset); __ERC20_init( string.concat("yGauge ", IERC20Metadata(_asset).name()), string.concat("yG-", IERC20Metadata(_asset).symbol()) ); emit Initialize(_asset, _owner); } /** @return total of the staked vault token */ function totalAssets() public view returns (uint256) { return totalSupply(); } /** The amount of shares that the Vault would exchange for the amount of assets provided. */ function convertToShares(uint256 _assets) public view returns (uint256) { return _assets; } /** The amount of assets that the Vault would exchange for the amount of shares provided. */ function convertToAssets(uint256 _shares) public view returns (uint256) { return _shares; } /** Maximum amount of the underlying asset that can be deposited into the Vault for the receiver, through a deposit call. */ function maxDeposit(address) public view returns (uint256) { return type(uint256).max; } /** Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given current on-chain conditions. */ function previewDeposit(uint256 _assets) public view returns (uint256) { return _assets; } /** Maximum amount of shares that can be minted from the Vault for the receiver, through a mint call. */ function maxMint(address) public view returns (uint256) { return type(uint256).max; } /** Allows an on-chain or off-chain user to simulate the effects of their mint at the current block, given current on-chain conditions. */ function previewMint(uint256 _shares) public view returns (uint256) { return _shares; } /** @param _account to look balance for * @return amount of staked token for an account */ function boostedBalanceOf( address _account ) external view returns (uint256) { return _boostedBalances[_account]; } /** @notice * Performs a snapshot of the account's accrued rewards since the previous update. * @dev * The snapshot made by this function depends on: * 1. The account's boosted balance * 2. The amount of reward emissions that have been added to the gauge since the * account's rewards were last updated. * Any function that mutates an account's balance, boostedBalance, userRewardPerTokenPaid, * or rewards MUST call updateReward before performing the mutation. */ function _updateReward(address _account) internal override { rewardPerTokenStored = _rewardPerToken(); lastUpdateTime = lastTimeRewardApplicable(); if (_account != address(0)) { if (_boostedBalances[_account] != 0) { uint256 newEarning = _newEarning(_account); uint256 maxEarning = _maxEarning(_account); rewards[_account] += newEarning; uint256 penalty = maxEarning - newEarning; _transferVeYfiORewards(penalty); emit TransferredPenalty(_account, penalty); } userRewardPerTokenPaid[_account] = rewardPerTokenStored; emit UpdatedRewards( _account, rewardPerTokenStored, lastUpdateTime, rewards[_account], userRewardPerTokenPaid[_account] ); } } function _beforeTokenTransfer( address _from, address _to, uint256 ) internal override { if (_from != address(0)) { _updateReward(_from); } if (_to != address(0)) { _updateReward(_to); } } function _afterTokenTransfer( address _from, address _to, uint256 ) internal override { if (_from != address(0)) { _boostedBalances[_from] = _boostedBalanceOf(_from); emit BoostedBalanceUpdated(_from, _boostedBalances[_from]); } if (_to != address(0)) { _boostedBalances[_to] = _boostedBalanceOf(_to); emit BoostedBalanceUpdated(_to, _boostedBalances[_to]); } } function _rewardPerToken() internal view override returns (uint256) { if (totalAssets() == 0) { return rewardPerTokenStored; } return rewardPerTokenStored + (((lastTimeRewardApplicable() - lastUpdateTime) * rewardRate * PRECISION_FACTOR) / totalAssets()); } /** @notice The total undistributed earnings for an account. * @dev Earnings are based on lock duration and boost * @return * Amount of tokens the account has earned that have yet to be distributed. */ function earned( address _account ) external view override(BaseGauge, IBaseGauge) returns (uint256) { uint256 newEarning = _newEarning(_account); return newEarning + rewards[_account]; } /** @notice Calculates an account's earnings based on their boostedBalance. * This function only reflects the accounts earnings since the last time * the account's rewards were calculated via _updateReward. */ function _newEarning( address _account ) internal view override returns (uint256) { return (_boostedBalances[_account] * (_rewardPerToken() - userRewardPerTokenPaid[_account])) / PRECISION_FACTOR; } /** @notice Calculates an account's potential maximum earnings based on * a maximum boost. * This function only reflects the accounts earnings since the last time * the account's rewards were calculated via _updateReward. */ function _maxEarning(address _account) internal view returns (uint256) { return (balanceOf(_account) * (_rewardPerToken() - userRewardPerTokenPaid[_account])) / PRECISION_FACTOR; } /** @notice * Calculates the boosted balance of based on veYFI balance. * @dev * This function expects this._totalAssets to be up to date. * @return * The account's boosted balance. Always lower than or equal to the * account's real balance. */ function nextBoostedBalanceOf( address _account ) external view returns (uint256) { return _boostedBalanceOf(_account); } /** @notice * Calculates the boosted balance of based on veYFI balance. * @dev * This function expects the account's _balances[_account].realBalance * to be up to date. * @dev This function expects this._totalAssets to be up to date. * @return * The account's boosted balance. Always lower than or equal to the * account's real balance. */ function _boostedBalanceOf( address _account ) internal view returns (uint256) { return _boostedBalanceOf(_account, balanceOf(_account)); } /** @notice * Calculates the boosted balance of an account based on its gauge stake * proportion & veYFI lock proportion. * @dev This function expects this._totalAssets to be up to date. * @param _account The account whose veYFI lock should be checked. * @param _realBalance The amount of token _account has locked in the gauge. * @return * The account's boosted balance. Always lower than or equal to the * account's real balance. */ function _boostedBalanceOf( address _account, uint256 _realBalance ) internal view returns (uint256) { uint256 veTotalSupply = IVotingYFI(VEYFI).totalSupply(); if (veTotalSupply == 0) { return _realBalance; } return Math.min( ((_realBalance * BOOSTING_FACTOR) + (((totalSupply() * IVotingYFI(VEYFI).balanceOf(_account)) / veTotalSupply) * (BOOST_DENOMINATOR - BOOSTING_FACTOR))) / BOOST_DENOMINATOR, _realBalance ); } /** @notice deposit vault tokens into the gauge * @dev a user without a veYFI should not lock. * @dev will deposit the min between user balance and user approval * @dev This call updates claimable rewards * @return amount of assets deposited */ function deposit() external returns (uint256) { uint256 balance = Math.min( asset.balanceOf(msg.sender), asset.allowance(msg.sender, address(this)) ); _deposit(balance, msg.sender); return balance; } /** @notice deposit vault tokens into the gauge * @dev a user without a veYFI should not lock. * @dev This call updates claimable rewards * @param _assets of vault token * @return amount of assets deposited */ function deposit(uint256 _assets) external returns (uint256) { _deposit(_assets, msg.sender); return _assets; } /** @notice deposit vault tokens into the gauge for a user * @dev vault token is taken from msg.sender * @dev This call update `_for` claimable rewards * @param _assets to deposit * @param _receiver the account to deposit to * @return true */ function deposit( uint256 _assets, address _receiver ) external returns (uint256) { _deposit(_assets, _receiver); return _assets; } /** @notice deposit vault tokens into the gauge for a user * @dev vault token is taken from msg.sender * @dev This call update `_for` claimable rewards * @dev shares and * @param _shares to deposit * @param _receiver the account to deposit to * @return amount of shares transfered */ function mint( uint256 _shares, address _receiver ) external returns (uint256) { _deposit(_shares, _receiver); return _shares; } function _deposit(uint256 _assets, address _receiver) internal { require(_assets != 0, "RewardPool : Cannot deposit 0"); //take away from sender asset.safeTransferFrom(msg.sender, address(this), _assets); // mint shares _mint(_receiver, _assets); emit Deposit(msg.sender, _receiver, _assets, _assets); } /** Maximum amount of the underlying asset that can be withdrawn from the owner balance in the Vault, through a withdraw call. */ function maxWithdraw(address _owner) external view returns (uint256) { return balanceOf(_owner); } function previewWithdraw(uint256 _assets) external view returns (uint256) { return _assets; } /** @notice Burns shares from owner and sends exactly assets of underlying tokens to receiver. * @dev This call updates claimable rewards * @param _assets amount to withdraw * @param _receiver account that will recieve the shares * @param _owner shares will be taken from account * @param _claim claim veYFI and additional reward * @return amount of shares withdrawn */ function withdraw( uint256 _assets, address _receiver, address _owner, bool _claim ) external returns (uint256) { return _withdraw(_assets, _receiver, _owner, _claim); } /** @notice Burns shares from owner and sends exactly assets of underlying tokens to receiver. * @dev This call updates claimable rewards * @param _assets amount to withdraw * @param _receiver account that will recieve the shares * @param _owner shares will be taken from account * @return amount of shares withdrawn */ function withdraw( uint256 _assets, address _receiver, address _owner ) external returns (uint256) { return _withdraw(_assets, _receiver, _owner, false); } /** @notice withdraw all vault tokens from gauge * @dev This call updates claimable rewards * @param _claim claim veYFI and additional reward * @return amount of shares withdrawn */ function withdraw(bool _claim) external returns (uint256) { return _withdraw(balanceOf(msg.sender), msg.sender, msg.sender, _claim); } /** @notice withdraw all vault token from gauge * @dev This call update claimable rewards * @return amount of shares withdrawn */ function withdraw() external returns (uint256) { return _withdraw(balanceOf(msg.sender), msg.sender, msg.sender, false); } function _withdraw( uint256 _assets, address _receiver, address _owner, bool _claim ) internal returns (uint256) { require(_assets != 0, "RewardPool : Cannot withdraw 0"); if (msg.sender != _owner) { _spendAllowance(_owner, msg.sender, _assets); } _burn(_owner, _assets); if (_claim) { _getReward(_owner); } asset.safeTransfer(_receiver, _assets); emit Withdraw(msg.sender, _receiver, _owner, _assets, _assets); return _assets; } function maxRedeem(address _owner) external view returns (uint256) { return balanceOf(_owner); } function previewRedeem(uint256 _assets) external view returns (uint256) { return _assets; } /** @notice Burns shares from owner and sends exactly assets of underlying tokens to receiver. * @dev This call updates claimable rewards * @param _assets amount to withdraw * @param _receiver account that will recieve the shares * @param _owner shares will be taken from account * @return amount of shares withdrawn */ function redeem( uint256 _assets, address _receiver, address _owner ) external override returns (uint256) { return _withdraw(_assets, _receiver, _owner, true); } /** * @notice * Get rewards * @return true */ function getReward() external updateReward(msg.sender) returns (bool) { _getReward(msg.sender); return true; } /** * @notice * Get rewards for an account * @dev rewards are transferred to _account * @param _account to claim rewards for * @return true */ function getReward( address _account ) external updateReward(_account) returns (bool) { _getReward(_account); return true; } /** @notice Distributes the rewards for the specified account. * @dev * This function MUST NOT be called without the caller invoking * updateReward(_account) first. */ function _getReward(address _account) internal { uint256 boostedBalance = _boostedBalanceOf(_account); _boostedBalances[_account] = boostedBalance; emit BoostedBalanceUpdated(_account, boostedBalance); uint256 reward = rewards[_account]; if (reward != 0) { rewards[_account] = 0; address recipient = recipients[_account]; if (recipient != address(0x0)) { REWARD_TOKEN.safeTransfer(recipient, reward); } else { REWARD_TOKEN.safeTransfer(_account, reward); } emit RewardPaid(_account, reward); } } function _transferVeYfiORewards(uint256 _penalty) internal { IERC20(REWARD_TOKEN).approve(VE_YFI_POOL, _penalty); IDYfiRewardPool(VE_YFI_POOL).burn(_penalty); } function _protectedTokens( address _token ) internal view override returns (bool) { return _token == address(REWARD_TOKEN) || _token == address(asset); } /** @notice Kick `addr` for abusing their boost @param _accounts Addresses to kick */ function kick(address[] calldata _accounts) public { for (uint256 i = 0; i < _accounts.length; ++i) { _kick(_accounts[i]); } } function _kick(address _account) internal updateReward(_account) { uint256 balance = balanceOf(_account); uint256 boostedBalance = _boostedBalanceOf(_account, balance); _boostedBalances[_account] = boostedBalance; emit BoostedBalanceUpdated(_account, boostedBalance); } /** @notice Set the recipient of rewards for an account @param _recipient Address to send rewards to */ function setRecipient(address _recipient) external { recipients[msg.sender] = _recipient; emit RecipientUpdated(msg.sender, _recipient); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.15; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/utils/math/Math.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol"; import "./interfaces/IBaseGauge.sol"; abstract contract BaseGauge is IBaseGauge, OwnableUpgradeable { IERC20 public immutable REWARD_TOKEN; //// @notice rewards are distributed over `duration` seconds when queued. uint256 public duration; uint256 public periodFinish; uint256 public rewardRate; uint256 public lastUpdateTime; uint256 public rewardPerTokenStored; /** @notice that are queued to be distributed on a `queueNewRewards` call @dev rewards are queued when an account `_updateReward`. */ uint256 public queuedRewards; uint256 public currentRewards; uint256 public historicalRewards; mapping(address => uint256) public userRewardPerTokenPaid; mapping(address => uint256) public rewards; event RewardsAdded( uint256 currentRewards, uint256 lastUpdateTime, uint256 periodFinish, uint256 rewardRate, uint256 historicalRewards ); event RewardsQueued(address indexed from, uint256 amount); event RewardPaid(address indexed user, uint256 reward); event UpdatedRewards( address indexed account, uint256 rewardPerTokenStored, uint256 lastUpdateTime, uint256 rewards, uint256 userRewardPerTokenPaid ); event Sweep(address indexed token, uint256 amount); event DurationUpdated( uint256 duration, uint256 rewardRate, uint256 periodFinish ); function _newEarning(address) internal view virtual returns (uint256); function _updateReward(address) internal virtual; function _rewardPerToken() internal view virtual returns (uint256); modifier updateReward(address account) { _updateReward(account); _; } constructor(address _rewardsToken) { require( address(_rewardsToken) != address(0x0), "rewardsToken 0x0 address" ); REWARD_TOKEN = IERC20(_rewardsToken); } function __initialize(address _owner) internal { require(_owner != address(0), "_owner 0x0 address"); duration = 14 days; _transferOwnership(_owner); } /** @notice set the duration of the reward distribution. @param _newDuration duration in seconds. */ function setDuration( uint256 _newDuration ) external onlyOwner updateReward(address(0)) { require(_newDuration != 0, "duration should be greater than zero"); if (block.timestamp < periodFinish) { uint256 remaining = periodFinish - block.timestamp; uint256 leftover = remaining * rewardRate; rewardRate = leftover / _newDuration; periodFinish = block.timestamp + _newDuration; } duration = _newDuration; emit DurationUpdated(_newDuration, rewardRate, periodFinish); } /** * @return timestamp until rewards are distributed */ function lastTimeRewardApplicable() public view returns (uint256) { return Math.min(block.timestamp, periodFinish); } /** @notice reward per token deposited * @dev gives the total amount of rewards distributed since the inception of the pool. * @return rewardPerToken */ function rewardPerToken() external view returns (uint256) { return _rewardPerToken(); } function _protectedTokens( address _token ) internal view virtual returns (bool) { return _token == address(REWARD_TOKEN); } /** @notice sweep tokens that are airdropped/transferred into the gauge. * @dev sweep can only be done on non-protected tokens. * @return _token to sweep */ function sweep(address _token) external onlyOwner returns (bool) { require(_protectedTokens(_token) == false, "protected token"); uint256 amount = IERC20(_token).balanceOf(address(this)); SafeERC20.safeTransfer(IERC20(_token), owner(), amount); emit Sweep(_token, amount); return true; } /** @notice earnings for an account * @dev earnings are based on lock duration and boost * @return amount of tokens earned */ function earned(address _account) external view virtual returns (uint256) { return _newEarning(_account); } /** * @notice * Add new rewards to be distributed over a week * @dev Trigger reward rate recalculation using `_amount` and queue rewards * @param _amount token to add to rewards * @return true */ function queueNewRewards(uint256 _amount) external override returns (bool) { require(_amount != 0, "==0"); SafeERC20.safeTransferFrom( IERC20(REWARD_TOKEN), msg.sender, address(this), _amount ); emit RewardsQueued(msg.sender, _amount); _amount = _amount + queuedRewards; if (block.timestamp >= periodFinish) { _notifyRewardAmount(_amount); queuedRewards = 0; return true; } uint256 elapsedSinceBeginingOfPeriod = block.timestamp - (periodFinish - duration); uint256 distributedSoFar = elapsedSinceBeginingOfPeriod * rewardRate; // we only restart a new period if _amount is 120% of distributedSoFar. if ((distributedSoFar * 12) / 10 < _amount) { _notifyRewardAmount(_amount); queuedRewards = 0; } else { queuedRewards = _amount; } return true; } function _notifyRewardAmount( uint256 _reward ) internal updateReward(address(0)) { historicalRewards = historicalRewards + _reward; if (block.timestamp >= periodFinish) { rewardRate = _reward / duration; } else { uint256 remaining = periodFinish - block.timestamp; uint256 leftover = remaining * rewardRate; _reward = _reward + leftover; rewardRate = _reward / duration; } currentRewards = _reward; lastUpdateTime = block.timestamp; periodFinish = block.timestamp + duration; emit RewardsAdded( currentRewards, lastUpdateTime, periodFinish, rewardRate, historicalRewards ); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.15; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; interface IBaseGauge { function queueNewRewards(uint256 _amount) external returns (bool); function earned(address _account) external view returns (uint256); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10**64) { value /= 10**64; result += 64; } if (value >= 10**32) { value /= 10**32; result += 32; } if (value >= 10**16) { value /= 10**16; result += 16; } if (value >= 10**8) { value /= 10**8; result += 8; } if (value >= 10**4) { value /= 10**4; result += 4; } if (value >= 10**2) { value /= 10**2; result += 2; } if (value >= 10**1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/ContextUpgradeable.sol"; import "../proxy/utils/Initializable.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ function __Ownable_init() internal onlyInitializing { __Ownable_init_unchained(); } function __Ownable_init_unchained() internal onlyInitializing { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } /** * @dev This empty reserved space is put in place to allow future versions to add new * variables without shifting down storage in the inheritance chain. * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps */ uint256[49] private __gap; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; import "../proxy/utils/Initializable.sol"; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract ContextUpgradeable is Initializable { function __Context_init() internal onlyInitializing { } function __Context_init_unchained() internal onlyInitializing { } function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } /** * @dev This empty reserved space is put in place to allow future versions to add new * variables without shifting down storage in the inheritance chain. * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps */ uint256[50] private __gap; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol) pragma solidity ^0.8.2; import "../../utils/AddressUpgradeable.sol"; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in * case an upgrade adds a module that needs to be initialized. * * For example: * * [.hljs-theme-light.nopadding] * ``` * contract MyToken is ERC20Upgradeable { * function initialize() initializer public { * __ERC20_init("MyToken", "MTK"); * } * } * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable { * function initializeV2() reinitializer(2) public { * __ERC20Permit_init("MyToken"); * } * } * ``` * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. * * [CAUTION] * ==== * Avoid leaving a contract uninitialized. * * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed: * * [.hljs-theme-light.nopadding] * ``` * /// @custom:oz-upgrades-unsafe-allow constructor * constructor() { * _disableInitializers(); * } * ``` * ==== */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. * @custom:oz-retyped-from bool */ uint8 private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Triggered when the contract has been initialized or reinitialized. */ event Initialized(uint8 version); /** * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope, * `onlyInitializing` functions can be used to initialize parent contracts. * * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a * constructor. * * Emits an {Initialized} event. */ modifier initializer() { bool isTopLevelCall = !_initializing; require( (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1), "Initializable: contract is already initialized" ); _initialized = 1; if (isTopLevelCall) { _initializing = true; } _; if (isTopLevelCall) { _initializing = false; emit Initialized(1); } } /** * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be * used to initialize parent contracts. * * A reinitializer may be used after the original initialization step. This is essential to configure modules that * are added through upgrades and that require initialization. * * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer` * cannot be nested. If one is invoked in the context of another, execution will revert. * * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in * a contract, executing them in the right order is up to the developer or operator. * * WARNING: setting the version to 255 will prevent any future reinitialization. * * Emits an {Initialized} event. */ modifier reinitializer(uint8 version) { require(!_initializing && _initialized < version, "Initializable: contract is already initialized"); _initialized = version; _initializing = true; _; _initializing = false; emit Initialized(version); } /** * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the * {initializer} and {reinitializer} modifiers, directly or indirectly. */ modifier onlyInitializing() { require(_initializing, "Initializable: contract is not initializing"); _; } /** * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call. * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized * to any version. It is recommended to use this to lock implementation contracts that are designed to be called * through proxies. * * Emits an {Initialized} event the first time it is successfully executed. */ function _disableInitializers() internal virtual { require(!_initializing, "Initializable: contract is initializing"); if (_initialized < type(uint8).max) { _initialized = type(uint8).max; emit Initialized(type(uint8).max); } } /** * @dev Returns the highest version that has been initialized. See {reinitializer}. */ function _getInitializedVersion() internal view returns (uint8) { return _initialized; } /** * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}. */ function _isInitializing() internal view returns (bool) { return _initializing; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library AddressUpgradeable { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, "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"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or 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 { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/draft-IERC20Permit.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts 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 (last updated v4.8.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, "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"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or 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 { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20Upgradeable.sol"; import "./extensions/IERC20MetadataUpgradeable.sol"; import "../../utils/ContextUpgradeable.sol"; import "../../proxy/utils/Initializable.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.openzeppelin.com/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 ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable { 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. */ function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing { __ERC20_init_unchained(name_, symbol_); } function __ERC20_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing { _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: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, 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}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, 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}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, 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) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, 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) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by // decrementing then incrementing. _balances[to] += amount; } emit Transfer(from, to, amount); _afterTokenTransfer(from, to, 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; unchecked { // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above. _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; // Overflow not possible: amount <= accountBalance <= totalSupply. _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 Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - 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 {} /** * @dev This empty reserved space is put in place to allow future versions to add new * variables without shifting down storage in the inheritance chain. * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps */ uint256[45] private __gap; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20Upgradeable { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20Upgradeable.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20MetadataUpgradeable is IERC20Upgradeable { /** * @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 pragma solidity 0.8.15; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "./IBaseGauge.sol"; interface IExtraReward is IBaseGauge { function initialize( address _gauge, address _reward, address _owner ) external; function rewardCheckpoint(address _account) external returns (bool); function getReward() external returns (bool); }
// 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 pragma solidity 0.8.15; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; interface IVotingYFI is IERC20 { struct LockedBalance { int128 amount; uint256 end; } function totalSupply() external view returns (uint256); function locked(address _user) external view returns (LockedBalance memory); function modify_lock( uint256 _amount, uint256 _unlock_time, address _user ) external; }
// SPDX-License-Identifier: MIT pragma solidity 0.8.15; import "./IBaseGauge.sol"; import "./IERC4626.sol"; interface IGauge is IBaseGauge, IERC4626 { function initialize(address _stakingToken, address _owner) external; function boostedBalanceOf(address _account) external view returns (uint256); function getReward(address _account) external returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.15; import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; /** * @title EIP 4626 specification * @notice Interface of EIP 4626 Interface * as defined in https://eips.ethereum.org/EIPS/eip-4626 */ interface IERC4626 is IERC20Upgradeable { /** * @notice Event indicating that `caller` exchanged `assets` for `shares`, and transferred those `shares` to `owner` * @dev Emitted when tokens are deposited into the vault via {mint} and {deposit} methods */ event Deposit( address indexed caller, address indexed owner, uint256 assets, uint256 shares ); /** * @notice Event indicating that `caller` exchanged `shares`, owned by `owner`, for `assets`, and transferred those * `assets` to `receiver` * @dev Emitted when shares are withdrawn from the vault via {redeem} or {withdraw} methods */ event Withdraw( address indexed caller, address indexed receiver, address indexed owner, uint256 assets, uint256 shares ); /** * @notice Returns the address of the underlying token used by the Vault * @return assetTokenAddress The address of the underlying ERC20 Token * @dev MUST be an ERC-20 token contract * * MUST not revert */ function asset() external view returns (IERC20 assetTokenAddress); /** * @notice Returns the total amount of the underlying asset managed by the Vault * @return totalManagedAssets Amount of the underlying asset * @dev Should include any compounding that occurs from yield. * * Should be inclusive of any fees that are charged against assets in the vault. * * Must not revert * */ function totalAssets() external view returns (uint256 totalManagedAssets); /** * * @notice Returns the amount of shares that, in an ideal scenario, the vault would exchange for the amount of assets * provided * * @param _assets Amount of assets to convert * @return shares Amount of shares that would be exchanged for the provided amount of assets * * @dev MUST NOT be inclusive of any fees that are charged against assets in the Vault. * * MUST NOT show any variations depending on the caller. * * MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange. * * MUST NOT revert unless due to integer overflow caused by an unreasonably large input. * * MUST round down towards 0. * * This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and from. */ function convertToShares( uint256 _assets ) external view returns (uint256 shares); /** * * @notice Returns the amount of assets that the vault would exchange for the amount of shares provided * * @param _shares Amount of vault shares to convert * @return assets Amount of assets that would be exchanged for the provided amount of shares * * @dev MUST NOT be inclusive of any fees that are charged against assets in the Vault. * * MUST NOT show any variations depending on the caller. * * MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange. * * MUST NOT revert unless due to integer overflow caused by an unreasonably large input. * * MUST round down towards 0. * * This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and from. */ function convertToAssets( uint256 _shares ) external view returns (uint256 assets); /** * * @notice Returns the maximum amount of the underlying asset that can be deposited into the vault for the `receiver` * through a {deposit} call * * @param _receiver Address whose maximum deposit is being queries * @return maxAssets * * @dev MUST return the maximum amount of assets {deposit} would allow to be deposited for receiver and not cause a * revert, which MUST NOT be higher than the actual maximum that would be accepted (it should underestimate if *necessary). This assumes that the user has infinite assets, i.e. MUST NOT rely on {balanceOf} of asset. * * MUST factor in both global and user-specific limits, like if deposits are entirely disabled (even temporarily) * it MUST return 0. * * MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited. * * MUST NOT revert. */ function maxDeposit( address _receiver ) external view returns (uint256 maxAssets); /** * @notice Simulate the effects of a user's deposit at the current block, given current on-chain conditions * @param _assets Amount of assets * @return shares Amount of shares * @dev MUST return as close to and no more than the exact amount of Vault shares that would be minted in a {deposit} * call in the same transaction. I.e. deposit should return the same or more shares as {previewDeposit} if called in * the same transaction. (I.e. {previewDeposit} should underestimate or round-down) * * MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the * deposit would be accepted, regardless if the user has enough tokens approved, etc. * * MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees. * * MUST NOT revert due to vault specific user/global limits. MAY revert due to other conditions that would also * cause deposit to revert. * * Note that any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage * in share price or some other type of condition, meaning the depositor will lose assets by depositing. */ function previewDeposit( uint256 _assets ) external view returns (uint256 shares); /** * @notice Mints `shares` Vault shares to `receiver` by depositing exactly `amount` of underlying tokens * @param _assets Amount of assets * @param _receiver Address to deposit underlying tokens into * @dev Must emit the {Deposit} event * * MUST support ERC-20 {approve} / {transferFrom} on asset as a deposit flow. MAY support an additional flow in * which the underlying tokens are owned by the Vault contract before the {deposit} execution, and are accounted for * during {deposit}. * * MUST revert if all of `assets` cannot be deposited (due to deposit limit being reached, slippage, the user not * approving enough underlying tokens to the Vault contract, etc). * * Note that most implementations will require pre-approval of the Vault with the Vault’s underlying asset token. */ function deposit( uint256 _assets, address _receiver ) external returns (uint256 shares); /** * @notice Returns the maximum amount of shares that can be minted from the vault for the `receiver``, via a `mint` * call * @param _receiver Address to deposit minted shares into * @return maxShares The maximum amount of shares * @dev MUST return the maximum amount of shares mint would allow to be deposited to receiver and not cause a revert, * which MUST NOT be higher than the actual maximum that would be accepted (it should underestimate if necessary). * This assumes that the user has infinite assets, i.e. MUST NOT rely on balanceOf of asset. * * MUST factor in both global and user-specific limits, like if mints are entirely disabled (even temporarily) it * * MUST return 0. * * MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of shares that may be minted. * * MUST NOT revert. */ function maxMint( address _receiver ) external view returns (uint256 maxShares); /** * @notice Simulate the effects of a user's mint at the current block, given current on-chain conditions * @param _shares Amount of shares to mint * @return assets Amount of assets required to mint `mint` amount of shares * @dev MUST return as close to and no fewer than the exact amount of assets that would be deposited in a mint call * in the same transaction. I.e. mint should return the same or fewer assets as previewMint if called in the same * transaction. (I.e. {previewMint} should overestimate or round-up) * * MUST NOT account for mint limits like those returned from maxMint and should always act as though the mint * would be accepted, regardless if the user has enough tokens approved, etc. * * MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees. * * MUST NOT revert due to vault specific user/global limits. MAY revert due to other conditions that would also * cause mint to revert. * * Note that any unfavorable discrepancy between convertToAssets and previewMint SHOULD be considered slippage in * share price or some other type of condition, meaning the depositor will lose assets by minting. */ function previewMint( uint256 _shares ) external view returns (uint256 assets); /** * @notice Mints exactly `shares` vault shares to `receiver` by depositing `amount` of underlying tokens * @param _shares Amount of shares to mint * @param _receiver Address to deposit minted shares into * @return assets Amount of assets transferred to vault * @dev Must emit the {Deposit} event * * MUST support ERC-20 {approve} / {transferFrom} on asset as a mint flow. MAY support an additional flow in * which the underlying tokens are owned by the Vault contract before the mint execution, and are accounted for * during mint. * * MUST revert if all of `shares` cannot be minted (due to deposit limit being reached, slippage, the user not * approving enough underlying tokens to the Vault contract, etc). * * Note that most implementations will require pre-approval of the Vault with the Vault’s underlying asset token. */ function mint( uint256 _shares, address _receiver ) external returns (uint256 assets); /** * @notice Returns the maximum amount of the underlying asset that can be withdrawn from the `owner` balance in the * vault, through a `withdraw` call. * @param _owner Address of the owner whose max withdrawal amount is being queries * @return maxAssets Maximum amount of underlying asset that can be withdrawn * @dev MUST return the maximum amount of assets that could be transferred from `owner` through {withdraw} and not * cause a revert, which MUST NOT be higher than the actual maximum that would be accepted (it should underestimate if * necessary). * * MUST factor in both global and user-specific limits, like if withdrawals are entirely disabled * (even temporarily) it MUST return 0. * * MUST NOT revert. */ function maxWithdraw( address _owner ) external view returns (uint256 maxAssets); /** * @notice Simulate the effects of a user's withdrawal at the current block, given current on-chain conditions. * @param _assets Amount of assets * @return shares Amount of shares * @dev MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a * {withdraw} call in the same transaction. I.e. {withdraw} should return the same or fewer shares as * {previewWithdraw} if called in the same transaction. (I.e. {previewWithdraw should overestimate or round-up}) * * MUST NOT account for withdrawal limits like those returned from {maxWithdraw} and should always act as though * the withdrawal would be accepted, regardless if the user has enough shares, etc. * * MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees. * * MUST NOT revert due to vault specific user/global limits. MAY revert due to other conditions that would also * cause {withdraw} to revert. * * Note that any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in * share price or some other type of condition, meaning the depositor will lose assets by depositing. */ function previewWithdraw( uint256 _assets ) external view returns (uint256 shares); /** * @notice Burns `shares` from `owner` and sends exactly `assets` of underlying tokens to `receiver` * @param _assets Amount of underling assets to withdraw * @return shares Amount of shares that will be burned * @dev Must emit the {Withdraw} event * * MUST support a withdraw flow where the shares are burned from `owner` directly where `owner` is `msg.sender` * or `msg.sender` has ERC-20 approval over the shares of `owner`. MAY support an additional flow in which the shares * are transferred to the Vault contract before the withdraw execution, and are accounted for during withdraw. * * MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner * not having enough shares, etc). * * Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed. * Those methods should be performed separately. */ function withdraw( uint256 _assets, address _receiver, address _owner ) external returns (uint256 shares); /** * @notice Returns the maximum amount of vault shares that can be redeemed from the `owner` balance in the vault, via * a `redeem` call. * @param _owner Address of the owner whose shares are being queries * @return maxShares Maximum amount of shares that can be redeemed * @dev MUST return the maximum amount of shares that could be transferred from `owner` through `redeem` and not cause * a revert, which MUST NOT be higher than the actual maximum that would be accepted (it should underestimate if * necessary). * * MUST factor in both global and user-specific limits, like if redemption is entirely disabled * (even temporarily) it MUST return 0. * * MUST NOT revert */ function maxRedeem( address _owner ) external view returns (uint256 maxShares); /** * @notice Simulate the effects of a user's redemption at the current block, given current on-chain conditions * @param _shares Amount of shares that are being simulated to be redeemed * @return assets Amount of underlying assets that can be redeemed * @dev MUST return as close to and no more than the exact amount of `assets `that would be withdrawn in a {redeem} * call in the same transaction. I.e. {redeem} should return the same or more assets as {previewRedeem} if called in * the same transaction. I.e. {previewRedeem} should underestimate/round-down * * MUST NOT account for redemption limits like those returned from {maxRedeem} and should always act as though * the redemption would be accepted, regardless if the user has enough shares, etc. * * MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees. * * MUST NOT revert due to vault specific user/global limits. MAY revert due to other conditions that would also * cause {redeem} to revert. * * Note that any unfavorable discrepancy between {convertToAssets} and {previewRedeem} SHOULD be considered * slippage in share price or some other type of condition, meaning the depositor will lose assets by redeeming. */ function previewRedeem( uint256 _shares ) external view returns (uint256 assets); /** * @notice Burns exactly `shares` from `owner` and sends `assets` of underlying tokens to `receiver` * @param _shares Amount of shares to burn * @param _receiver Address to deposit redeemed underlying tokens to * @return assets Amount of underlying tokens redeemed * @dev Must emit the {Withdraw} event * MUST support a {redeem} flow where the shares are burned from owner directly where `owner` is `msg.sender` or * * `msg.sender` has ERC-20 approval over the shares of `owner`. MAY support an additional flow in which the shares * are transferred to the Vault contract before the {redeem} execution, and are accounted for during {redeem}. * * MUST revert if all of {shares} cannot be redeemed (due to withdrawal limit being reached, slippage, the owner * not having enough shares, etc). * * Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed. * Those methods should be performed separately. */ function redeem( uint256 _shares, address _receiver, address _owner ) external returns (uint256 assets); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.15; interface IDYfiRewardPool { function burn(uint256 _amount) external returns (bool); }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "remappings": [ "@openzeppelin/contracts-upgradeable=.cache/openzeppelin-upgradeable/v4.8.1", "@openzeppelin/contracts=.cache/openzeppelin/v4.8.1" ], "viaIR": false }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_claim","type":"bool"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_assets","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"address","name":"_owner","type":"address"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_assets","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"address","name":"_owner","type":"address"},{"internalType":"bool","name":"_claim","type":"bool"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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)
00000000000000000000000090c1f9220d90d3966fbee24045edd73e1d588ad500000000000000000000000041252e8691e964f7de35156b68493bab6797a2750000000000000000000000002391fc8f5e417526338f5aa3968b1851c16d894e
-----Decoded View---------------
Arg [0] : _veYfi (address): 0x90c1f9220d90d3966FbeE24045EDd73E1d588aD5
Arg [1] : _dYfi (address): 0x41252E8691e964f7DE35156B68493bAb6797a275
Arg [2] : _veYfiDYfiPool (address): 0x2391Fc8f5E417526338F5aa3968b1851C16D894E
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000090c1f9220d90d3966fbee24045edd73e1d588ad5
Arg [1] : 00000000000000000000000041252e8691e964f7de35156b68493bab6797a275
Arg [2] : 0000000000000000000000002391fc8f5e417526338f5aa3968b1851c16d894e
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Multichain Portfolio | 30 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.