0xe0f4...5cd4

{{
  "language": "Solidity",
  "sources": {
    "WalletSimple.sol": {
      "content": "pragma solidity ^0.4.18;\nimport \"./Forwarder.sol\";\nimport \"./ERC20Interface.sol\";\n/**\n *\n * WalletSimple\n * ============\n *\n * Basic multi-signer wallet designed for use in a co-signing environment where 2 signatures are required to move funds.\n * Typically used in a 2-of-3 signing configuration. Uses ecrecover to allow for 2 signatures in a single transaction.\n *\n * The first signature is created on the operation hash (see Data Formats) and passed to sendMultiSig/sendMultiSigToken\n * The signer is determined by verifyMultiSig().\n *\n * The second signature is created by the submitter of the transaction and determined by msg.signer.\n *\n * Data Formats\n * ============\n *\n * The signature is created with ethereumjs-util.ecsign(operationHash).\n * Like the eth_sign RPC call, it packs the values as a 65-byte array of [r, s, v].\n * Unlike eth_sign, the message is not prefixed.\n *\n * The operationHash the result of keccak256(prefix, toAddress, value, data, expireTime).\n * For ether transactions, `prefix` is \"ETHER\".\n * For token transaction, `prefix` is \"ERC20\" and `data` is the tokenContractAddress.\n *\n *\n */\ncontract WalletSimple {\n  // Events\n  event Deposited(address from, uint value, bytes data);\n  event SafeModeActivated(address msgSender);\n  event Transacted(\n    address msgSender, // Address of the sender of the message initiating the transaction\n    address otherSigner, // Address of the signer (second signature) used to initiate the transaction\n    bytes32 operation, // Operation hash (see Data Formats)\n    address toAddress, // The address the transaction was sent to\n    uint value, // Amount of Wei sent to the address\n    bytes data // Data sent when invoking the transaction\n  );\n\n  // Public fields\n  address[] public signers; // The addresses that can co-sign transactions on the wallet\n  bool public safeMode = false; // When active, wallet may only send to signer addresses\n\n  // Internal fields\n  uint constant SEQUENCE_ID_WINDOW_SIZE = 10;\n  uint[10] recentSequenceIds;\n\n  /**\n   * Set up a simple multi-sig wallet by specifying the signers allowed to be used on this wallet.\n   * 2 signers will be required to send a transaction from this wallet.\n   * Note: The sender is NOT automatically added to the list of signers.\n   * Signers CANNOT be changed once they are set\n   *\n   * @param allowedSigners An array of signers on the wallet\n   */\n  function WalletSimple(address[] allowedSigners) public {\n    if (allowedSigners.length != 3) {\n      // Invalid number of signers\n      revert();\n    }\n    signers = allowedSigners;\n  }\n\n  /**\n   * Determine if an address is a signer on this wallet\n   * @param signer address to check\n   * returns boolean indicating whether address is signer or not\n   */\n  function isSigner(address signer) public view returns (bool) {\n    // Iterate through all signers on the wallet and\n    for (uint i = 0; i < signers.length; i++) {\n      if (signers[i] == signer) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * Modifier that will execute internal code block only if the sender is an authorized signer on this wallet\n   */\n  modifier onlySigner {\n    if (!isSigner(msg.sender)) {\n      revert();\n    }\n    _;\n  }\n\n  /**\n   * Gets called when a transaction is received without calling a method\n   */\n  function() public payable {\n    if (msg.value > 0) {\n      // Fire deposited event if we are receiving funds\n      Deposited(msg.sender, msg.value, msg.data);\n    }\n  }\n\n  /**\n   * Create a new contract (and also address) that forwards funds to this contract\n   * returns address of newly created forwarder address\n   */\n  function createForwarder() public returns (address) {\n    return new Forwarder();\n  }\n\n  /**\n   * Execute a multi-signature transaction from this wallet using 2 signers: one from msg.sender and the other from ecrecover.\n   * Sequence IDs are numbers starting from 1. They are used to prevent replay attacks and may not be repeated.\n   *\n   * @param toAddress the destination address to send an outgoing transaction\n   * @param value the amount in Wei to be sent\n   * @param data the data to send to the toAddress when invoking the transaction\n   * @param expireTime the number of seconds since 1970 for which this transaction is valid\n   * @param sequenceId the unique sequence id obtainable from getNextSequenceId\n   * @param signature see Data Formats\n   */\n  function sendMultiSig(\n      address toAddress,\n      uint value,\n      bytes data,\n      uint expireTime,\n      uint sequenceId,\n      bytes signature\n  ) public onlySigner {\n    // Verify the other signer\n    var operationHash = keccak256(\"ETHER\", toAddress, value, data, expireTime, sequenceId);\n    \n    var otherSigner = verifyMultiSig(toAddress, operationHash, signature, expireTime, sequenceId);\n\n    // Success, send the transaction\n    if (!(toAddress.call.value(value)(data))) {\n      // Failed executing transaction\n      revert();\n    }\n    Transacted(msg.sender, otherSigner, operationHash, toAddress, value, data);\n  }\n  \n  /**\n   * Execute a multi-signature token transfer from this wallet using 2 signers: one from msg.sender and the other from ecrecover.\n   * Sequence IDs are numbers starting from 1. They are used to prevent replay attacks and may not be repeated.\n   *\n   * @param toAddress the destination address to send an outgoing transaction\n   * @param value the amount in tokens to be sent\n   * @param tokenContractAddress the address of the erc20 token contract\n   * @param expireTime the number of seconds since 1970 for which this transaction is valid\n   * @param sequenceId the unique sequence id obtainable from getNextSequenceId\n   * @param signature see Data Formats\n   */\n  function sendMultiSigToken(\n      address toAddress,\n      uint value,\n      address tokenContractAddress,\n      uint expireTime,\n      uint sequenceId,\n      bytes signature\n  ) public onlySigner {\n    // Verify the other signer\n    var operationHash = keccak256(\"ERC20\", toAddress, value, tokenContractAddress, expireTime, sequenceId);\n    \n    verifyMultiSig(toAddress, operationHash, signature, expireTime, sequenceId);\n    \n    ERC20Interface instance = ERC20Interface(tokenContractAddress);\n    if (!instance.transfer(toAddress, value)) {\n        revert();\n    }\n  }\n  \n  /**\n   * Execute a token flush from one of the forwarder addresses. This transfer needs only a single signature and can be done by any signer\n   *\n   * @param forwarderAddress the address of the forwarder address to flush the tokens from\n   * @param tokenContractAddress the address of the erc20 token contract\n   */\n  function flushForwarderTokens(\n    address forwarderAddress, \n    address tokenContractAddress\n  ) public onlySigner {\n    Forwarder forwarder = Forwarder(forwarderAddress);\n    forwarder.flushTokens(tokenContractAddress);\n  }\n\n  /**\n   * Do common multisig verification for both eth sends and erc20token transfers\n   *\n   * @param toAddress the destination address to send an outgoing transaction\n   * @param operationHash see Data Formats\n   * @param signature see Data Formats\n   * @param expireTime the number of seconds since 1970 for which this transaction is valid\n   * @param sequenceId the unique sequence id obtainable from getNextSequenceId\n   * returns address that has created the signature\n   */\n  function verifyMultiSig(\n      address toAddress,\n      bytes32 operationHash,\n      bytes signature,\n      uint expireTime,\n      uint sequenceId\n  ) private returns (address) {\n\n    var otherSigner = recoverAddressFromSignature(operationHash, signature);\n\n    // Verify if we are in safe mode. In safe mode, the wallet can only send to signers\n    if (safeMode && !isSigner(toAddress)) {\n      // We are in safe mode and the toAddress is not a signer. Disallow!\n      revert();\n    }\n    // Verify that the transaction has not expired\n    if (expireTime < block.timestamp) {\n      // Transaction expired\n      revert();\n    }\n\n    // Try to insert the sequence ID. Will revert if the sequence id was invalid\n    tryInsertSequenceId(sequenceId);\n\n    if (!isSigner(otherSigner)) {\n      // Other signer not on this wallet or operation does not match arguments\n      revert();\n    }\n    if (otherSigner == msg.sender) {\n      // Cannot approve own transaction\n      revert();\n    }\n\n    return otherSigner;\n  }\n\n  /**\n   * Irrevocably puts contract into safe mode. When in this mode, transactions may only be sent to signing addresses.\n   */\n  function activateSafeMode() public onlySigner {\n    safeMode = true;\n    SafeModeActivated(msg.sender);\n  }\n\n  /**\n   * Gets signer's address using ecrecover\n   * @param operationHash see Data Formats\n   * @param signature see Data Formats\n   * returns address recovered from the signature\n   */\n  function recoverAddressFromSignature(\n    bytes32 operationHash,\n    bytes signature\n  ) private pure returns (address) {\n    if (signature.length != 65) {\n      revert();\n    }\n    // We need to unpack the signature, which is given as an array of 65 bytes (like eth.sign)\n    bytes32 r;\n    bytes32 s;\n    uint8 v;\n    assembly {\n      r := mload(add(signature, 32))\n      s := mload(add(signature, 64))\n      v := and(mload(add(signature, 65)), 255)\n    }\n    if (v < 27) {\n      v += 27; // Ethereum versions are 27 or 28 as opposed to 0 or 1 which is submitted by some signing libs\n    }\n    return ecrecover(operationHash, v, r, s);\n  }\n\n  /**\n   * Verify that the sequence id has not been used before and inserts it. Throws if the sequence ID was not accepted.\n   * We collect a window of up to 10 recent sequence ids, and allow any sequence id that is not in the window and\n   * greater than the minimum element in the window.\n   * @param sequenceId to insert into array of stored ids\n   */\n  function tryInsertSequenceId(uint sequenceId) private onlySigner {\n    // Keep a pointer to the lowest value element in the window\n    uint lowestValueIndex = 0;\n    for (uint i = 0; i < SEQUENCE_ID_WINDOW_SIZE; i++) {\n      if (recentSequenceIds[i] == sequenceId) {\n        // This sequence ID has been used before. Disallow!\n        revert();\n      }\n      if (recentSequenceIds[i] < recentSequenceIds[lowestValueIndex]) {\n        lowestValueIndex = i;\n      }\n    }\n    if (sequenceId < recentSequenceIds[lowestValueIndex]) {\n      // The sequence ID being used is lower than the lowest value in the window\n      // so we cannot accept it as it may have been used before\n      revert();\n    }\n    if (sequenceId > (recentSequenceIds[lowestValueIndex] + 10000)) {\n      // Block sequence IDs which are much higher than the lowest value\n      // This prevents people blocking the contract by using very large sequence IDs quickly\n      revert();\n    }\n    recentSequenceIds[lowestValueIndex] = sequenceId;\n  }\n\n  /**\n   * Gets the next available sequence ID for signing when using executeAndConfirm\n   * returns the sequenceId one higher than the highest currently stored\n   */\n  function getNextSequenceId() public view returns (uint) {\n    uint highestSequenceId = 0;\n    for (uint i = 0; i < SEQUENCE_ID_WINDOW_SIZE; i++) {\n      if (recentSequenceIds[i] > highestSequenceId) {\n        highestSequenceId = recentSequenceIds[i];\n      }\n    }\n    return highestSequenceId + 1;\n  }\n}\n"
    },
    "Forwarder.sol": {
      "content": "pragma solidity ^0.4.18;\nimport \"./ERC20Interface.sol\";\n/**\n * Contract that will forward any incoming Ether to its creator\n */\ncontract Forwarder {\n  // Address to which any funds sent to this contract will be forwarded\n  address public parentAddress;\n  event ForwarderDeposited(address from, uint value, bytes data);\n\n  event TokensFlushed(\n    address tokenContractAddress, // The contract address of the token\n    uint value // Amount of token sent\n  );\n\n  /**\n   * Create the contract, and set the destination address to that of the creator\n   */\n  function Forwarder() {\n    parentAddress = msg.sender;\n  }\n\n  /**\n   * Modifier that will execute internal code block only if the sender is a parent of the forwarder contract\n   */\n  modifier onlyParent {\n    if (msg.sender != parentAddress) {\n      throw;\n    }\n    _;\n  }\n\n  /**\n   * Default function; Gets called when Ether is deposited, and forwards it to the destination address\n   */\n  function() payable {\n    if (!parentAddress.call.value(msg.value)(msg.data))\n      throw;\n    // Fire off the deposited event if we can forward it  \n    ForwarderDeposited(msg.sender, msg.value, msg.data);\n  }\n\n  /**\n   * Execute a token transfer of the full balance from the forwarder token to the main wallet contract\n   * @param tokenContractAddress the address of the erc20 token contract\n   */\n  function flushTokens(address tokenContractAddress) onlyParent {\n    ERC20Interface instance = ERC20Interface(tokenContractAddress);\n    var forwarderAddress = address(this);\n    var forwarderBalance = instance.balanceOf(forwarderAddress);\n    if (forwarderBalance == 0) {\n      return;\n    }\n    if (!instance.transfer(parentAddress, forwarderBalance)) {\n      throw;\n    }\n    TokensFlushed(tokenContractAddress, forwarderBalance);\n  }\n\n  /**\n   * It is possible that funds were sent to this address before the contract was deployed.\n   * We can flush those funds to the destination address.\n   */\n  function flush() {\n    if (!parentAddress.call.value(this.balance)())\n      throw;\n  }\n}\n"
    },
    "ERC20Interface.sol": {
      "content": "pragma solidity ^0.4.11;\n/**\n * Contract that exposes the needed erc20 token functions\n */\n\ncontract ERC20Interface {\n  // Send _value amount of tokens to address _to\n  function transfer(address _to, uint256 _value) public returns (bool success);\n  // Get the account balance of another account with address _owner\n  function balanceOf(address _owner) public constant returns (uint256 balance);\n}"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}