pragma solidity ^0.4.4; import "MultiSigWallet.sol"; /// @title Multisignature wallet with daily limit - Allows an owner to withdraw a daily limit without multisig. /// @author Stefan George - contract MultiSigWalletWithDailyLimit is MultiSigWallet { event DailyLimitChange(uint dailyLimit); uint public dailyLimit; uint public lastDay; uint public spentToday; /* * Public functions */ /// @dev Contract constructor sets initial owners, required number of confirmations and daily withdraw limit. /// @param _owners List of initial owners. /// @param _required Number of required confirmations. /// @param _dailyLimit Amount in wei, which can be withdrawn without confirmations on a daily basis. constructor(address[] memory _owners, uint _required, uint _dailyLimit) public MultiSigWallet(_owners, _required) { dailyLimit = _dailyLimit; } /// @dev Allows to change the daily limit. Transaction has to be sent by wallet. /// @param _dailyLimit Amount in wei. function changeDailyLimit(uint _dailyLimit) public onlyWallet { dailyLimit = _dailyLimit; emit DailyLimitChange(_dailyLimit); } /// @dev Allows anyone to execute a confirmed transaction or ether withdraws until daily limit is reached. /// @param transactionId Transaction ID. function executeTransaction(uint transactionId) public notExecuted(transactionId) { Transaction storage tx = transactions[transactionId]; bool confirmed = isConfirmed(transactionId); if (confirmed || tx.data.length == 0 && isUnderLimit(tx.value)) { tx.executed = true; if (!confirmed) spentToday += tx.value; if (tx.destination.call.value(tx.value)(tx.data)) emit Execution(transactionId); else { emit ExecutionFailure(transactionId); tx.executed = false; if (!confirmed) spentToday -= tx.value; } } } /* * Internal functions */ /// @dev Returns if amount is within daily limit and resets spentToday after one day. /// @param amount Amount to withdraw. /// @return Returns if amount is under daily limit. function isUnderLimit(uint amount) internal returns (bool) { if (now > lastDay + 24 hours) { lastDay = now; spentToday = 0; } if (spentToday + amount > dailyLimit || spentToday + amount < spentToday) return false; return true; } /* * Web3 call functions */ /// @dev Returns maximum withdraw amount. /// @return Returns amount. function calcMaxWithdraw() public view returns (uint) { if (now > lastDay + 24 hours) return dailyLimit; if (dailyLimit < spentToday) return 0; return dailyLimit - spentToday; } }