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/**
 *Submitted for verification at Etherscan.io on 2021-01-13
*/

// SPDX-License-Identifier: Apache-2.0
pragma solidity 0.7.5;

/**
 * Contract that exposes the needed erc20 token functions
 */

abstract contract ERC20Interface {
  // Send _value amount of tokens to address _to
  function transfer(address _to, uint256 _value)
    public
    virtual
    returns (bool success);

  // Get the account balance of another account with address _owner
  function balanceOf(address _owner)
    public
    virtual
    view
    returns (uint256 balance);
}

/**
 * Contract that will forward any incoming Ether to the creator of the contract
 *
 */
contract Forwarder {
  // Address to which any funds sent to this contract will be forwarded
  address public parentAddress;
  event ForwarderDeposited(address from, uint256 value, bytes data);

  /**
   * Initialize the contract, and sets the destination address to that of the creator
   */
  function init(address _parentAddress) external onlyUninitialized {
    parentAddress = _parentAddress;
    this.flush();
  }

  /**
   * Modifier that will execute internal code block only if the sender is the parent address
   */
  modifier onlyParent {
    require(msg.sender == parentAddress, "Only Parent");
    _;
  }

  /**
   * Modifier that will execute internal code block only if the contract has not been initialized yet
   */
  modifier onlyUninitialized {
    require(parentAddress == address(0x0), "Already initialized");
    _;
  }

  /**
   * Default function; Gets called when data is sent but does not match any other function
   */
  fallback() external payable {
    this.flush();
  }

  /**
   * Default function; Gets called when Ether is deposited with no data, and forwards it to the parent address
   */
  receive() external payable {
    this.flush();
  }

  /**
   * Execute a token transfer of the full balance from the forwarder token to the parent address
   * @param tokenContractAddress the address of the erc20 token contract
   */
  function flushTokens(address tokenContractAddress) external onlyParent {
    ERC20Interface instance = ERC20Interface(tokenContractAddress);
    address forwarderAddress = address(this);
    uint256 forwarderBalance = instance.balanceOf(forwarderAddress);
    if (forwarderBalance == 0) {
      return;
    }

    require(
      instance.transfer(parentAddress, forwarderBalance),
      "Token flush failed"
    );
  }

  /**
   * Flush the entire balance of the contract to the parent address.
   */
  function flush() external {
    uint256 value = address(this).balance;

    if (value == 0) {
      return;
    }

    (bool success, ) = parentAddress.call{ value: value }("");
    require(success, "Flush failed");
    emit ForwarderDeposited(msg.sender, value, msg.data);
  }
}

/**
 *
 * WalletSimple
 * ============
 *
 * Basic multi-signer wallet designed for use in a co-signing environment where 2 signatures are required to move funds.
 * Typically used in a 2-of-3 signing configuration. Uses ecrecover to allow for 2 signatures in a single transaction.
 *
 * The first signature is created on the operation hash (see Data Formats) and passed to sendMultiSig/sendMultiSigToken
 * The signer is determined by verifyMultiSig().
 *
 * The second signature is created by the submitter of the transaction and determined by msg.signer.
 *
 * Data Formats
 * ============
 *
 * The signature is created with ethereumjs-util.ecsign(operationHash).
 * Like the eth_sign RPC call, it packs the values as a 65-byte array of [r, s, v].
 * Unlike eth_sign, the message is not prefixed.
 *
 * The operationHash the result of keccak256(prefix, toAddress, value, data, expireTime).
 * For ether transactions, `prefix` is "ETHER".
 * For token transaction, `prefix` is "ERC20" and `data` is the tokenContractAddress.
 *
 *
 */
contract WalletSimple {
  // Events
  event Deposited(address from, uint256 value, bytes data);
  event SafeModeActivated(address msgSender);
  event Transacted(
    address msgSender, // Address of the sender of the message initiating the transaction
    address otherSigner, // Address of the signer (second signature) used to initiate the transaction
    bytes32 operation, // Operation hash (see Data Formats)
    address toAddress, // The address the transaction was sent to
    uint256 value, // Amount of Wei sent to the address
    bytes data // Data sent when invoking the transaction
  );

  event BatchTransfer(address sender, address recipient, uint256 value);
  // this event shows the other signer and the operation hash that they signed
  // specific batch transfer events are emitted in Batcher
  event BatchTransacted(
    address msgSender, // Address of the sender of the message initiating the transaction
    address otherSigner, // Address of the signer (second signature) used to initiate the transaction
    bytes32 operation // Operation hash (see Data Formats)
  );

  // Public fields
  mapping(address => bool) public signers; // The addresses that can co-sign transactions on the wallet
  bool public safeMode = false; // When active, wallet may only send to signer addresses
  bool public initialized = false; // True if the contract has been initialized

  // Internal fields
  uint256 private lastSequenceId;
  uint256 private constant MAX_SEQUENCE_ID_INCREASE = 10000;

  /**
   * Set up a simple multi-sig wallet by specifying the signers allowed to be used on this wallet.
   * 2 signers will be required to send a transaction from this wallet.
   * Note: The sender is NOT automatically added to the list of signers.
   * Signers CANNOT be changed once they are set
   *
   * @param allowedSigners An array of signers on the wallet
   */
  function init(address[] calldata allowedSigners) external onlyUninitialized {
    require(allowedSigners.length == 3, "Invalid number of signers");

    for (uint8 i = 0; i < allowedSigners.length; i++) {
      require(allowedSigners[i] != address(0), "Invalid signer");
      signers[allowedSigners[i]] = true;
    }
    initialized = true;
  }

  /**
   * Get the network identifier that signers must sign over
   * This provides protection signatures being replayed on other chains
   * This must be a virtual function because chain-specific contracts will need
   *    to override with their own network ids. It also can't be a field
   *    to allow this contract to be used by proxy with delegatecall, which will
   *    not pick up on state variables
   */
  function getNetworkId() internal virtual pure returns (string memory) {
    return "ETHER";
  }

  /**
   * Get the network identifier that signers must sign over for token transfers
   * This provides protection signatures being replayed on other chains
   * This must be a virtual function because chain-specific contracts will need
   *    to override with their own network ids. It also can't be a field
   *    to allow this contract to be used by proxy with delegatecall, which will
   *    not pick up on state variables
   */
  function getTokenNetworkId() internal virtual pure returns (string memory) {
    return "ERC20";
  }

  /**
   * Get the network identifier that signers must sign over for batch transfers
   * This provides protection signatures being replayed on other chains
   * This must be a virtual function because chain-specific contracts will need
   *    to override with their own network ids. It also can't be a field
   *    to allow this contract to be used by proxy with delegatecall, which will
   *    not pick up on state variables
   */
  function getBatchNetworkId() internal virtual pure returns (string memory) {
    return "ETHER-Batch";
  }

  /**
   * Determine if an address is a signer on this wallet
   * @param signer address to check
   * returns boolean indicating whether address is signer or not
   */
  function isSigner(address signer) public view returns (bool) {
    return signers[signer];
  }

  /**
   * Modifier that will execute internal code block only if the sender is an authorized signer on this wallet
   */
  modifier onlySigner {
    require(isSigner(msg.sender), "Non-signer in onlySigner method");
    _;
  }

  /**
   * Modifier that will execute internal code block only if the contract has not been initialized yet
   */
  modifier onlyUninitialized {
    require(!initialized, "Contract already initialized");
    _;
  }

  /**
   * Gets called when a transaction is received with data that does not match any other method
   */
  fallback() external payable {
    if (msg.value > 0) {
      // Fire deposited event if we are receiving funds
      Deposited(msg.sender, msg.value, msg.data);
    }
  }

  /**
   * Gets called when a transaction is received with ether and no data
   */
  receive() external payable {
    if (msg.value > 0) {
      // Fire deposited event if we are receiving funds
      Deposited(msg.sender, msg.value, msg.data);
    }
  }

  /**
   * Execute a multi-signature transaction from this wallet using 2 signers: one from msg.sender and the other from ecrecover.
   * Sequence IDs are numbers starting from 1. They are used to prevent replay attacks and may not be repeated.
   *
   * @param toAddress the destination address to send an outgoing transaction
   * @param value the amount in Wei to be sent
   * @param data the data to send to the toAddress when invoking the transaction
   * @param expireTime the number of seconds since 1970 for which this transaction is valid
   * @param sequenceId the unique sequence id obtainable from getNextSequenceId
   * @param signature see Data Formats
   */
  function sendMultiSig(
    address toAddress,
    uint256 value,
    bytes calldata data,
    uint256 expireTime,
    uint256 sequenceId,
    bytes calldata signature
  ) external onlySigner {
    // Verify the other signer
    bytes32 operationHash = keccak256(
      abi.encodePacked(
        getNetworkId(),
        toAddress,
        value,
        data,
        expireTime,
        sequenceId
      )
    );

    address otherSigner = verifyMultiSig(
      toAddress,
      operationHash,
      signature,
      expireTime,
      sequenceId
    );

    // Success, send the transaction
    (bool success, ) = toAddress.call{ value: value }(data);
    require(success, "Call execution failed");

    emit Transacted(
      msg.sender,
      otherSigner,
      operationHash,
      toAddress,
      value,
      data
    );
  }

  /**
   * Execute a batched multi-signature transaction from this wallet using 2 signers: one from msg.sender and the other from ecrecover.
   * Sequence IDs are numbers starting from 1. They are used to prevent replay attacks and may not be repeated.
   * The recipients and values to send are encoded in two arrays, where for index i, recipients[i] will be sent values[i].
   *
   * @param recipients The list of recipients to send to
   * @param values The list of values to send to
   * @param expireTime the number of seconds since 1970 for which this transaction is valid
   * @param sequenceId the unique sequence id obtainable from getNextSequenceId
   * @param signature see Data Formats
   */
  function sendMultiSigBatch(
    address[] calldata recipients,
    uint256[] calldata values,
    uint256 expireTime,
    uint256 sequenceId,
    bytes calldata signature
  ) external onlySigner {
    require(recipients.length != 0, "Not enough recipients");
    require(
      recipients.length == values.length,
      "Unequal recipients and values"
    );
    require(recipients.length < 256, "Too many recipients, max 255");

    // Verify the other signer
    bytes32 operationHash = keccak256(
      abi.encodePacked(
        getBatchNetworkId(),
        recipients,
        values,
        expireTime,
        sequenceId
      )
    );

    // the first parameter (toAddress) is used to ensure transactions in safe mode only go to a signer
    // if in safe mode, we should use normal sendMultiSig to recover, so this check will always fail if in safe mode
    require(!safeMode, "Batch in safe mode");
    address otherSigner = verifyMultiSig(
      address(0x0),
      operationHash,
      signature,
      expireTime,
      sequenceId
    );

    batchTransfer(recipients, values);
    emit BatchTransacted(msg.sender, otherSigner, operationHash);
  }

  /**
   * Transfer funds in a batch to each of recipients
   * @param recipients The list of recipients to send to
   * @param values The list of values to send to recipients.
   *  The recipient with index i in recipients array will be sent values[i].
   *  Thus, recipients and values must be the same length
   */
  function batchTransfer(
    address[] calldata recipients,
    uint256[] calldata values
  ) internal {
    for (uint256 i = 0; i < recipients.length; i++) {
      require(address(this).balance >= values[i], "Insufficient funds");

      (bool success, ) = recipients[i].call{ value: values[i] }("");
      require(success, "Call failed");

      emit BatchTransfer(msg.sender, recipients[i], values[i]);
    }
  }

  /**
   * Execute a multi-signature token transfer from this wallet using 2 signers: one from msg.sender and the other from ecrecover.
   * Sequence IDs are numbers starting from 1. They are used to prevent replay attacks and may not be repeated.
   *
   * @param toAddress the destination address to send an outgoing transaction
   * @param value the amount in tokens to be sent
   * @param tokenContractAddress the address of the erc20 token contract
   * @param expireTime the number of seconds since 1970 for which this transaction is valid
   * @param sequenceId the unique sequence id obtainable from getNextSequenceId
   * @param signature see Data Formats
   */
  function sendMultiSigToken(
    address toAddress,
    uint256 value,
    address tokenContractAddress,
    uint256 expireTime,
    uint256 sequenceId,
    bytes calldata signature
  ) external onlySigner {
    // Verify the other signer
    bytes32 operationHash = keccak256(
      abi.encodePacked(
        getTokenNetworkId(),
        toAddress,
        value,
        tokenContractAddress,
        expireTime,
        sequenceId
      )
    );

    verifyMultiSig(
      toAddress,
      operationHash,
      signature,
      expireTime,
      sequenceId
    );

    ERC20Interface instance = ERC20Interface(tokenContractAddress);
    require(instance.transfer(toAddress, value), "ERC20 Transfer call failed");
  }

  /**
   * Execute a token flush from one of the forwarder addresses. This transfer needs only a single signature and can be done by any signer
   *
   * @param forwarderAddress the address of the forwarder address to flush the tokens from
   * @param tokenContractAddress the address of the erc20 token contract
   */
  function flushForwarderTokens(
    address payable forwarderAddress,
    address tokenContractAddress
  ) external onlySigner {
    Forwarder forwarder = Forwarder(forwarderAddress);
    forwarder.flushTokens(tokenContractAddress);
  }

  /**
   * Do common multisig verification for both eth sends and erc20token transfers
   *
   * @param toAddress the destination address to send an outgoing transaction
   * @param operationHash see Data Formats
   * @param signature see Data Formats
   * @param expireTime the number of seconds since 1970 for which this transaction is valid
   * @param sequenceId the unique sequence id obtainable from getNextSequenceId
   * returns address that has created the signature
   */
  function verifyMultiSig(
    address toAddress,
    bytes32 operationHash,
    bytes calldata signature,
    uint256 expireTime,
    uint256 sequenceId
  ) private returns (address) {
    address otherSigner = recoverAddressFromSignature(operationHash, signature);

    // Verify if we are in safe mode. In safe mode, the wallet can only send to signers
    require(!safeMode || isSigner(toAddress), "External transfer in safe mode");

    // Verify that the transaction has not expired
    require(expireTime >= block.timestamp, "Transaction expired");

    // Try to insert the sequence ID. Will revert if the sequence id was invalid
    tryUpdateSequenceId(sequenceId);

    require(isSigner(otherSigner), "Invalid signer");

    require(otherSigner != msg.sender, "Signers cannot be equal");

    return otherSigner;
  }

  /**
   * Irrevocably puts contract into safe mode. When in this mode, transactions may only be sent to signing addresses.
   */
  function activateSafeMode() external onlySigner {
    safeMode = true;
    SafeModeActivated(msg.sender);
  }

  /**
   * Gets signer's address using ecrecover
   * @param operationHash see Data Formats
   * @param signature see Data Formats
   * returns address recovered from the signature
   */
  function recoverAddressFromSignature(
    bytes32 operationHash,
    bytes memory signature
  ) private pure returns (address) {
    require(signature.length == 65, "Invalid signature - wrong length");

    // We need to unpack the signature, which is given as an array of 65 bytes (like eth.sign)
    bytes32 r;
    bytes32 s;
    uint8 v;

    // solhint-disable-next-line
    assembly {
      r := mload(add(signature, 32))
      s := mload(add(signature, 64))
      v := and(mload(add(signature, 65)), 255)
    }
    if (v < 27) {
      v += 27; // Ethereum versions are 27 or 28 as opposed to 0 or 1 which is submitted by some signing libs
    }

    // protect against signature malleability
    // S value must be in the lower half orader
    // reference: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/051d340171a93a3d401aaaea46b4b62fa81e5d7c/contracts/cryptography/ECDSA.sol#L53
    require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");

    // note that this returns 0 if the signature is invalid
    // Since 0x0 can never be a signer, when the recovered signer address
    // is checked against our signer list, that 0x0 will cause an invalid signer failure
    return ecrecover(operationHash, v, r, s);
  }

  /**
   * Verify that the sequence id is greater than the currently stored value and updates the stored value.
   * By requiring sequence IDs to always increase, we ensure that the same signature can't be used twice.
   * @param sequenceId The new sequenceId to use
   */
  function tryUpdateSequenceId(uint256 sequenceId) private onlySigner {
    require(sequenceId > lastSequenceId, "sequenceId is too low");

    // Block sequence IDs which are much higher than the current
    // This prevents people blocking the contract by using very large sequence IDs quickly
    require(
      sequenceId <= lastSequenceId + MAX_SEQUENCE_ID_INCREASE,
      "sequenceId is too high"
    );

    lastSequenceId = sequenceId;
  }

  /**
   * Gets the next available sequence ID for signing when using executeAndConfirm
   * returns the sequenceId one higher than the one currently stored
   */
  function getNextSequenceId() external view returns (uint256) {
    return lastSequenceId + 1;
  }
}

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