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May 27, 2022 13:30
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| pragma solidity ^0.8.13; | |
| contract MultiSigWallet { | |
| event Deposit(address indexed sender, uint amount); | |
| event Submit(uint indexed txId); // tx submitted waiting for other owners to approve | |
| event Approve(address indexed owner, uint indexed txId); // can aprove | |
| event Revoke(address indexed owner, uint indexed txId); // can revoke approval | |
| event Execute(uint indexed txId); | |
| modifier onlyOwner { | |
| require(isOwner[msg.sender], "Not an owner of the multisig"); | |
| _; | |
| } | |
| modifier txExists(uint _txId) { | |
| require(_txId < transactions.length, "Tx does not exist"); | |
| _; | |
| } | |
| modifier notApproved(uint _txId) { | |
| require(!approved[_txId][msg.sender], "Owner already approved the tx"); | |
| _; | |
| } | |
| modifier notExecuted(uint _txId) { | |
| require(!transactions[_txId].executed, "Tx already executed"); | |
| _; | |
| } | |
| struct Transaction { | |
| address to; | |
| uint value; | |
| bytes data; | |
| bool executed; | |
| } | |
| address[] public owners; | |
| mapping(address => bool) public isOwner; // would it be cheaper to iterate thru owners array each time? | |
| Transaction[] public transactions; | |
| // key is the index of the tx in the transactions queue | |
| mapping(uint => mapping(address => bool)) public approved; | |
| uint public required; | |
| constructor(address[] memory _owners, uint _required) { | |
| require(_owners.length > 0, "Owners required"); | |
| require(_required <= _owners.length && _required > 0, "Invalid required num of owners"); | |
| for(uint i; i < _owners.length; i++) { | |
| address owner = _owners[i]; | |
| require(owner != address(0), "Invalid owner at address 0"); | |
| require(!isOwner[owner], "Owner is not unique"); | |
| isOwner[owner] = true; | |
| owners.push(owner); | |
| required = _required; | |
| } | |
| } | |
| receive() external payable { | |
| emit Deposit(msg.sender, msg.value); | |
| } | |
| function submit(address _to, uint _value, bytes calldata _data) external onlyOwner { | |
| transactions.push(Transaction(_to, _value, _data, false)); | |
| emit Submit(transactions.length - 1); | |
| } | |
| function approve(uint _txId) external onlyOwner txExists(_txId) notApproved(_txId) notExecuted(_txId) { | |
| approved[_txId][msg.sender] = true; | |
| emit Approve(msg.sender, _txId); | |
| } | |
| function _getApprovalCount(uint _txId) private view returns (uint count) { | |
| for (uint i; i < owners.length; i++) { | |
| if(approved[_txId][owners[i]]) { | |
| count += 1; | |
| } | |
| } | |
| } | |
| function execute(uint _txId) external txExists(_txId) notExecuted(_txId) { | |
| require(_getApprovalCount(_txId) > required, "Not enough approvals to execute the tx"); | |
| Transaction storage transaction = transactions[_txId]; | |
| // mark execution true - in case of failed transaction it will be an 'attempted' execution | |
| // will not be possible to execute it again | |
| transaction.executed = true; | |
| // execution | |
| (bool success,) = transaction.to.call{value: transaction.value}(transaction.data); | |
| require(success, "tx failed"); | |
| emit Execute(_txId); | |
| } | |
| function revoke(uint _txId) external onlyOwner txExists(_txId) notExecuted(_txId) { | |
| require(approved[_txId][msg.sender], "Not approved"); | |
| approved[_txId][msg.sender] = false; | |
| emit Revoke(msg.sender, _txId); | |
| } | |
| } |
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