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Latest 25 from a total of 207 transactions
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Deposit | 21314180 | 3 days ago | IN | 0 ETH | 0.00193614 | ||||
Get Reward | 21270265 | 9 days ago | IN | 0 ETH | 0.00095639 | ||||
Get Reward | 21270222 | 9 days ago | IN | 0 ETH | 0.00097938 | ||||
Get Reward | 21268002 | 9 days ago | IN | 0 ETH | 0.00150701 | ||||
Deposit | 21227587 | 15 days ago | IN | 0 ETH | 0.00112843 | ||||
Transfer | 21227462 | 15 days ago | IN | 0 ETH | 0.00161173 | ||||
Get Reward | 21213814 | 17 days ago | IN | 0 ETH | 0.00134544 | ||||
Get Reward | 21213543 | 17 days ago | IN | 0 ETH | 0.00129723 | ||||
Withdraw | 21202515 | 18 days ago | IN | 0 ETH | 0.00180707 | ||||
Get Reward | 21201804 | 18 days ago | IN | 0 ETH | 0.00226173 | ||||
Get Reward | 21163123 | 24 days ago | IN | 0 ETH | 0.00300695 | ||||
Get Reward | 21098695 | 33 days ago | IN | 0 ETH | 0.00053857 | ||||
Get Reward | 21098665 | 33 days ago | IN | 0 ETH | 0.00068351 | ||||
Get Reward | 21097868 | 33 days ago | IN | 0 ETH | 0.00055374 | ||||
Get Reward | 21070698 | 37 days ago | IN | 0 ETH | 0.00077307 | ||||
Get Reward | 21070698 | 37 days ago | IN | 0 ETH | 0.00085278 | ||||
Get Reward | 21052803 | 39 days ago | IN | 0 ETH | 0.00095474 | ||||
Deposit | 21035883 | 42 days ago | IN | 0 ETH | 0.00182361 | ||||
Withdraw | 21035863 | 42 days ago | IN | 0 ETH | 0.00191602 | ||||
Get Reward | 21034954 | 42 days ago | IN | 0 ETH | 0.00142913 | ||||
Get Reward | 21034923 | 42 days ago | IN | 0 ETH | 0.00138243 | ||||
Get Reward | 21028571 | 43 days ago | IN | 0 ETH | 0.00147064 | ||||
Get Reward | 20983174 | 49 days ago | IN | 0 ETH | 0.00097369 | ||||
Get Reward | 20983103 | 49 days ago | IN | 0 ETH | 0.00103623 | ||||
Get Reward | 20969531 | 51 days ago | IN | 0 ETH | 0.00198456 |
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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0x7Fd8Af95...4274C56a3 The constructor portion of the code might be different and could alter the actual behaviour of the contract
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"}]
Deployed Bytecode
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Multichain Portfolio | 30 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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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.