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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 - <stefan.george@consensys.net>
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/// @param _dailyLimit Amount in wei, which can be withdrawn without confirmations on a daily basis.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)) {
if (!confirmed)
spentToday += tx.value;
(tx.executed,) = tx.destination.call.value(tx.value)(tx.data);
if (tx.executed)
emit Execution(transactionId);
else {
emit ExecutionFailure(transactionId);
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;
}
}
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