Contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

/**
 * A multisig wallet library
 * Only deployed once, proxy contracts execute the functions via delegatecall
 * Owners can:
 * - Submit a transaction
 * - Approve and revoke approval of pending transactions
 * - Anyone can execute a transaction after enough owners approved it
 */
contract WalletLibrary {
    event Deposit(address indexed sender, uint256 amount, uint256 balance);
    event SubmitTransaction(
        address indexed owner,
        uint256 indexed txIndex,
        address indexed to,
        uint256 value,
        bytes data
    );
    event ConfirmTransaction(address indexed owner, uint256 indexed txIndex);
    event RevokeConfirmation(address indexed owner, uint256 indexed txIndex);
    event ExecuteTransaction(address indexed owner, uint256 indexed txIndex);

    address public walletLibrary;
    address[] public owners;
    mapping(address => bool) public isOwner;
    uint256 public numConfirmationsRequired;

    struct Transaction {
        address to;
        uint256 value;
        bytes data;
        bool executed;
        uint256 numConfirmations;
    }

    // mapping from tx index => owner => bool
    mapping(uint256 => mapping(address => bool)) public isConfirmed;

    Transaction[] public transactions;

    modifier onlyOwner() {
        require(isOwner[msg.sender], "not owner");
        _;
    }

    modifier txExists(uint256 _txIndex) {
        require(_txIndex < transactions.length, "tx does not exist");
        _;
    }

    modifier notExecuted(uint256 _txIndex) {
        require(!transactions[_txIndex].executed, "tx already executed");
        _;
    }

    modifier notConfirmed(uint256 _txIndex) {
        require(!isConfirmed[_txIndex][msg.sender], "tx already confirmed");
        _;
    }

    function initWallet(
        address[] memory _owners,
        uint256 _numConfirmationsRequired
    ) public {
        require(_owners.length > 0, "owners required");
        require(
            _numConfirmationsRequired > 0 &&
                _numConfirmationsRequired <= _owners.length,
            "invalid number of confirmations"
        );

        for (uint256 i = 0; i < _owners.length; i++) {
            address owner = _owners[i];

            require(owner != address(0), "invalid owner");
            require(!isOwner[owner], "owner not unique");

            isOwner[owner] = true;
            owners.push(owner);
        }

        numConfirmationsRequired = _numConfirmationsRequired;
    }

    receive() external payable {
        emit Deposit(msg.sender, msg.value, address(this).balance);
    }

    function submitTransaction(
        address _to,
        uint256 _value,
        bytes memory _data
    ) public onlyOwner {
        uint256 txIndex = transactions.length;

        transactions.push(
            Transaction({
                to: _to,
                value: _value,
                data: _data,
                executed: false,
                numConfirmations: 0
            })
        );

        emit SubmitTransaction(msg.sender, txIndex, _to, _value, _data);
    }

    function confirmTransaction(uint256 _txIndex)
        public
        onlyOwner
        txExists(_txIndex)
        notExecuted(_txIndex)
        notConfirmed(_txIndex)
    {
        Transaction storage transaction = transactions[_txIndex];
        transaction.numConfirmations += 1;
        isConfirmed[_txIndex][msg.sender] = true;

        emit ConfirmTransaction(msg.sender, _txIndex);
    }

    function executeTransaction(uint256 _txIndex)
        public
        onlyOwner
        txExists(_txIndex)
        notExecuted(_txIndex)
    {
        Transaction storage transaction = transactions[_txIndex];

        require(
            transaction.numConfirmations >= numConfirmationsRequired,
            "cannot execute tx"
        );

        transaction.executed = true;

        (bool success, ) = transaction.to.call{value: transaction.value}(
            transaction.data
        );
        require(success, "tx failed");

        emit ExecuteTransaction(msg.sender, _txIndex);
    }

    function revokeConfirmation(uint256 _txIndex)
        public
        onlyOwner
        txExists(_txIndex)
        notExecuted(_txIndex)
    {
        Transaction storage transaction = transactions[_txIndex];

        require(isConfirmed[_txIndex][msg.sender], "tx not confirmed");

        transaction.numConfirmations -= 1;
        isConfirmed[_txIndex][msg.sender] = false;

        emit RevokeConfirmation(msg.sender, _txIndex);
    }

    function getOwners() public view returns (address[] memory) {
        return owners;
    }

    function getTransactionCount() public view returns (uint256) {
        return transactions.length;
    }

    function getTransaction(uint256 _txIndex)
        public
        view
        returns (
            address to,
            uint256 value,
            bytes memory data,
            bool executed,
            uint256 numConfirmations
        )
    {
        Transaction storage transaction = transactions[_txIndex];

        return (
            transaction.to,
            transaction.value,
            transaction.data,
            transaction.executed,
            transaction.numConfirmations
        );
    }
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "script/=script/",
    "src/=src/",
    "test/=test/",
    "src/=src/",
    "test/=test/",
    "script/=script/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"uint256","name":"txIndex","type":"uint256"}],"name":"ConfirmTransaction","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"balance","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"uint256","name":"txIndex","type":"uint256"}],"name":"ExecuteTransaction","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"uint256","name":"txIndex","type":"uint256"}],"name":"RevokeConfirmation","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"uint256","name":"txIndex","type":"uint256"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"SubmitTransaction","type":"event"},{"inputs":[{"internalType":"uint256","name":"_txIndex","type":"uint256"}],"name":"confirmTransaction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_txIndex","type":"uint256"}],"name":"executeTransaction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getOwners","outputs":[{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_txIndex","type":"uint256"}],"name":"getTransaction","outputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"bool","name":"executed","type":"bool"},{"internalType":"uint256","name":"numConfirmations","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTransactionCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"_owners","type":"address[]"},{"internalType":"uint256","name":"_numConfirmationsRequired","type":"uint256"}],"name":"initWallet","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"isConfirmed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"numConfirmationsRequired","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"owners","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_txIndex","type":"uint256"}],"name":"revokeConfirmation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"submitTransaction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"transactions","outputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"bool","name":"executed","type":"bool"},{"internalType":"uint256","name":"numConfirmations","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"walletLibrary","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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