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pragma solidity 0.6.6;


import "./SimpleReadAccessController.sol";
import "./interfaces/AccessControllerInterface.sol";
import "./interfaces/FlagsInterface.sol";


/**
 * @title The Flags contract
 * @notice Allows flags to signal to any reader on the access control list.
 * The owner can set flags, or designate other addresses to set flags. The
 * owner must turn the flags off, other setters cannot. An expected pattern is
 * to allow addresses to raise flags on themselves, so if you are subscribing to
 * FlagOn events you should filter for addresses you care about.
 */
contract Flags is FlagsInterface, SimpleReadAccessController {

  AccessControllerInterface public raisingAccessController;

  mapping(address => bool) private flags;

  event FlagRaised(
    address indexed subject
  );
  event FlagLowered(
    address indexed subject
  );
  event RaisingAccessControllerUpdated(
    address indexed previous,
    address indexed current
  );

  /**
   * @param racAddress address for the raising access controller.
   */
  constructor(
    address racAddress
  )
    public
  {
    setRaisingAccessController(racAddress);
  }

  /**
   * @notice read the warning flag status of a contract address.
   * @param subject The contract address being checked for a flag.
   * @return A true value indicates that a flag was raised and a
   * false value indicates that no flag was raised.
   */
  function getFlag(address subject)
    external
    view
    override
    checkAccess()
    returns (bool)
  {
    return flags[subject];
  }

  /**
   * @notice read the warning flag status of a contract address.
   * @param subjects An array of addresses being checked for a flag.
   * @return An array of bools where a true value for any flag indicates that
   * a flag was raised and a false value indicates that no flag was raised.
   */
  function getFlags(address[] calldata subjects)
    external
    view
    override
    checkAccess()
    returns (bool[] memory)
  {
    bool[] memory responses = new bool[](subjects.length);
    for (uint256 i = 0; i < subjects.length; i++) {
      responses[i] = flags[subjects[i]];
    }
    return responses;
  }

  /**
   * @notice enable the warning flag for an address.
   * Access is controlled by raisingAccessController, except for owner
   * who always has access.
   * @param subject The contract address whose flag is being raised
   */
  function raiseFlag(address subject)
    external
    override
  {
    require(allowedToRaiseFlags(), "Not allowed to raise flags");

    tryToRaiseFlag(subject);
  }

  /**
   * @notice enable the warning flags for multiple addresses.
   * Access is controlled by raisingAccessController, except for owner
   * who always has access.
   * @param subjects List of the contract addresses whose flag is being raised
   */
  function raiseFlags(address[] calldata subjects)
    external
    override
  {
    require(allowedToRaiseFlags(), "Not allowed to raise flags");

    for (uint256 i = 0; i < subjects.length; i++) {
      tryToRaiseFlag(subjects[i]);
    }
  }

  /**
   * @notice allows owner to disable the warning flags for multiple addresses.
   * @param subjects List of the contract addresses whose flag is being lowered
   */
  function lowerFlags(address[] calldata subjects)
    external
    override
    onlyOwner()
  {
    for (uint256 i = 0; i < subjects.length; i++) {
      address subject = subjects[i];

      if (flags[subject]) {
        flags[subject] = false;
        emit FlagLowered(subject);
      }
    }
  }

  /**
   * @notice allows owner to change the access controller for raising flags.
   * @param racAddress new address for the raising access controller.
   */
  function setRaisingAccessController(
    address racAddress
  )
    public
    override
    onlyOwner()
  {
    address previous = address(raisingAccessController);

    if (previous != racAddress) {
      raisingAccessController = AccessControllerInterface(racAddress);

      emit RaisingAccessControllerUpdated(previous, racAddress);
    }
  }


  // PRIVATE

  function allowedToRaiseFlags()
    private
    view
    returns (bool)
  {
    return msg.sender == owner ||
      raisingAccessController.hasAccess(msg.sender, msg.data);
  }

  function tryToRaiseFlag(address subject)
    private
  {
    if (!flags[subject]) {
      flags[subject] = true;
      emit FlagRaised(subject);
    }
  }

}

pragma solidity ^0.6.0;

import "./SimpleWriteAccessController.sol";

/**
 * @title SimpleReadAccessController
 * @notice Gives access to:
 * - any externally owned account (note that offchain actors can always read
 * any contract storage regardless of onchain access control measures, so this
 * does not weaken the access control while improving usability)
 * - accounts explicitly added to an access list
 * @dev SimpleReadAccessController is not suitable for access controlling writes
 * since it grants any externally owned account access! See
 * SimpleWriteAccessController for that.
 */
contract SimpleReadAccessController is SimpleWriteAccessController {

  /**
   * @notice Returns the access of an address
   * @param _user The address to query
   */
  function hasAccess(
    address _user,
    bytes memory _calldata
  )
    public
    view
    virtual
    override
    returns (bool)
  {
    return super.hasAccess(_user, _calldata) || _user == tx.origin;
  }

}

pragma solidity ^0.6.0;

import "./Owned.sol";
import "./interfaces/AccessControllerInterface.sol";

/**
 * @title SimpleWriteAccessController
 * @notice Gives access to accounts explicitly added to an access list by the
 * controller's owner.
 * @dev does not make any special permissions for externally, see
 * SimpleReadAccessController for that.
 */
contract SimpleWriteAccessController is AccessControllerInterface, Owned {

  bool public checkEnabled;
  mapping(address => bool) internal accessList;

  event AddedAccess(address user);
  event RemovedAccess(address user);
  event CheckAccessEnabled();
  event CheckAccessDisabled();

  constructor()
    public
  {
    checkEnabled = true;
  }

  /**
   * @notice Returns the access of an address
   * @param _user The address to query
   */
  function hasAccess(
    address _user,
    bytes memory
  )
    public
    view
    virtual
    override
    returns (bool)
  {
    return accessList[_user] || !checkEnabled;
  }

  /**
   * @notice Adds an address to the access list
   * @param _user The address to add
   */
  function addAccess(address _user)
    external
    onlyOwner()
  {
    if (!accessList[_user]) {
      accessList[_user] = true;

      emit AddedAccess(_user);
    }
  }

  /**
   * @notice Removes an address from the access list
   * @param _user The address to remove
   */
  function removeAccess(address _user)
    external
    onlyOwner()
  {
    if (accessList[_user]) {
      accessList[_user] = false;

      emit RemovedAccess(_user);
    }
  }

  /**
   * @notice makes the access check enforced
   */
  function enableAccessCheck()
    external
    onlyOwner()
  {
    if (!checkEnabled) {
      checkEnabled = true;

      emit CheckAccessEnabled();
    }
  }

  /**
   * @notice makes the access check unenforced
   */
  function disableAccessCheck()
    external
    onlyOwner()
  {
    if (checkEnabled) {
      checkEnabled = false;

      emit CheckAccessDisabled();
    }
  }

  /**
   * @dev reverts if the caller does not have access
   */
  modifier checkAccess() {
    require(hasAccess(msg.sender, msg.data), "No access");
    _;
  }
}

pragma solidity ^0.6.0;

/**
 * @title The Owned contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract Owned {

  address payable public owner;
  address private pendingOwner;

  event OwnershipTransferRequested(
    address indexed from,
    address indexed to
  );
  event OwnershipTransferred(
    address indexed from,
    address indexed to
  );

  constructor() public {
    owner = msg.sender;
  }

  /**
   * @dev Allows an owner to begin transferring ownership to a new address,
   * pending.
   */
  function transferOwnership(address _to)
    external
    onlyOwner()
  {
    pendingOwner = _to;

    emit OwnershipTransferRequested(owner, _to);
  }

  /**
   * @dev Allows an ownership transfer to be completed by the recipient.
   */
  function acceptOwnership()
    external
  {
    require(msg.sender == pendingOwner, "Must be proposed owner");

    address oldOwner = owner;
    owner = msg.sender;
    pendingOwner = address(0);

    emit OwnershipTransferred(oldOwner, msg.sender);
  }

  /**
   * @dev Reverts if called by anyone other than the contract owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner, "Only callable by owner");
    _;
  }

}

pragma solidity ^0.6.0;

interface AccessControllerInterface {
  function hasAccess(address user, bytes calldata data) external view returns (bool);
}

pragma solidity ^0.6.0;

interface FlagsInterface {
  function getFlag(address) external view returns (bool);
  function getFlags(address[] calldata) external view returns (bool[] memory);
  function raiseFlag(address) external;
  function raiseFlags(address[] calldata) external;
  function lowerFlags(address[] calldata) external;
  function setRaisingAccessController(address) external;
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "evmVersion": "istanbul",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

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0000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : racAddress (address): 0x0000000000000000000000000000000000000000

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000