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Clean up
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58 changed files with 4663 additions and 1043 deletions
180
advanced_knowledge/wallets/multisig.sol
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180
advanced_knowledge/wallets/multisig.sol
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.17;
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// Let's create an multi-sig wallet. Here are the specifications.
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// The wallet owners can
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// - submit a transaction
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// - approve and revoke approval of pending transcations
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// - anyone can execute a transcation after enough owners has approved it.
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contract MultiSigWallet {
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event Deposit(address indexed sender, uint amount, uint balance);
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event SubmitTransaction(
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address indexed owner,
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uint indexed txIndex,
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address indexed to,
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uint value,
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bytes data
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);
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event ConfirmTransaction(address indexed owner, uint indexed txIndex);
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event RevokeConfirmation(address indexed owner, uint indexed txIndex);
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event ExecuteTransaction(address indexed owner, uint indexed txIndex);
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address[] public owners;
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mapping(address => bool) public isOwner;
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uint public numConfirmationsRequired;
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struct Transaction {
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address to;
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uint value;
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bytes data;
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bool executed;
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uint numConfirmations;
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}
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// mapping from tx index => owner => bool
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mapping(uint => mapping(address => bool)) public isConfirmed;
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Transaction[] public transactions;
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modifier onlyOwner() {
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require(isOwner[msg.sender], "not owner");
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_;
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}
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modifier txExists(uint _txIndex) {
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require(_txIndex < transactions.length, "tx does not exist");
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_;
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}
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modifier notExecuted(uint _txIndex) {
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require(!transactions[_txIndex].executed, "tx already executed");
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_;
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}
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modifier notConfirmed(uint _txIndex) {
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require(!isConfirmed[_txIndex][msg.sender], "tx already confirmed");
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_;
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}
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constructor(address[] memory _owners, uint _numConfirmationsRequired) {
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require(_owners.length > 0, "owners required");
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require(
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_numConfirmationsRequired > 0 &&
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_numConfirmationsRequired <= _owners.length,
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"invalid number of required confirmations"
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);
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for (uint i = 0; i < _owners.length; i++) {
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address owner = _owners[i];
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require(owner != address(0), "invalid owner");
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require(!isOwner[owner], "owner not unique");
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isOwner[owner] = true;
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owners.push(owner);
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}
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numConfirmationsRequired = _numConfirmationsRequired;
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}
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receive() external payable {
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emit Deposit(msg.sender, msg.value, address(this).balance);
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}
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function submitTransaction(
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address _to,
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uint _value,
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bytes memory _data
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) public onlyOwner {
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uint txIndex = transactions.length;
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transactions.push(
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Transaction({
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to: _to,
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value: _value,
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data: _data,
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executed: false,
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numConfirmations: 0
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})
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);
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emit SubmitTransaction(msg.sender, txIndex, _to, _value, _data);
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}
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function confirmTransaction(
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uint _txIndex
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) public onlyOwner txExists(_txIndex) notExecuted(_txIndex) notConfirmed(_txIndex) {
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Transaction storage transaction = transactions[_txIndex];
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transaction.numConfirmations += 1;
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isConfirmed[_txIndex][msg.sender] = true;
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emit ConfirmTransaction(msg.sender, _txIndex);
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}
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function executeTransaction(
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uint _txIndex
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) public onlyOwner txExists(_txIndex) notExecuted(_txIndex) {
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Transaction storage transaction = transactions[_txIndex];
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require(
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transaction.numConfirmations >= numConfirmationsRequired,
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"cannot execute tx"
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);
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transaction.executed = true;
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(bool success, ) = transaction.to.call{value: transaction.value}(
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transaction.data
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);
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require(success, "tx failed");
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emit ExecuteTransaction(msg.sender, _txIndex);
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}
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function revokeConfirmation(
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uint _txIndex
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) public onlyOwner txExists(_txIndex) notExecuted(_txIndex) {
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Transaction storage transaction = transactions[_txIndex];
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require(isConfirmed[_txIndex][msg.sender], "tx not confirmed");
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transaction.numConfirmations -= 1;
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isConfirmed[_txIndex][msg.sender] = false;
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emit RevokeConfirmation(msg.sender, _txIndex);
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}
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function getOwners() public view returns (address[] memory) {
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return owners;
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}
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function getTransactionCount() public view returns (uint) {
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return transactions.length;
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}
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function getTransaction(
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uint _txIndex
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)
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public
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view
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returns (
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address to,
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uint value,
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bytes memory data,
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bool executed,
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uint numConfirmations
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)
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{
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Transaction storage transaction = transactions[_txIndex];
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return (
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transaction.to,
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transaction.value,
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transaction.data,
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transaction.executed,
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transaction.numConfirmations
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);
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}
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}
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