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•  contract Ownable
•    - function owner()
•    - function isOwner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
• library Roles
•    - function add(Role storage role, addre ...
•    - function remove(Role storage role, ad ...
•    - function has(Role storage role, addre ...
• library ECDSA
•    - function recover(bytes32 hash, bytes ...
•    - function toEthSignedMessageHash(bytes ...
•  contract PauserRole
•    - function isPauser(address account)
•    - function addPauser(address account)
•    - function renouncePauser()
•    - function _addPauser(address account)
•    - function _removePauser(address accoun ...
•  contract Pausable is PauserRole
•    - function paused()
•    - function pause()
•    - function unpause()
•  contract MCHDailyActionV3 is Ownab ... *
•    - function setValidater(address _varida ...
•    - function requestDailyActionReward(byt ...
•    - function validateSig(address _from, i ...
•    - function encodeData(address _from, in ...
•    - function ethSignedMessageHash(bytes32 ...
•    - function recover(bytes32 _data, bytes ...

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/**
 *Submitted for verification at Etherscan.io on 2019-09-30
*/

pragma solidity ^0.5.0;
// produced by the Solididy File Flattener (c) David Appleton 2018
// contact : [email protected]
// released under Apache 2.0 licence
// input  /Users/rmanzoku/src/github.com/doublejumptokyo/mch-dailyaction/contracts/MCHDailyActionV3.sol
// flattened :  Monday, 30-Sep-19 08:38:23 UTC
contract Ownable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @return the address of the owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner());
        _;
    }

    /**
     * @return true if `msg.sender` is the owner of the contract.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * @notice Renouncing to ownership will leave the contract without an owner.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0));
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev give an account access to this role
     */
    function add(Role storage role, address account) internal {
        require(account != address(0));
        require(!has(role, account));

        role.bearer[account] = true;
    }

    /**
     * @dev remove an account's access to this role
     */
    function remove(Role storage role, address account) internal {
        require(account != address(0));
        require(has(role, account));

        role.bearer[account] = false;
    }

    /**
     * @dev check if an account has this role
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0));
        return role.bearer[account];
    }
}

library ECDSA {
    /**
     * @dev Recover signer address from a message by using their signature
     * @param hash bytes32 message, the hash is the signed message. What is recovered is the signer address.
     * @param signature bytes signature, the signature is generated using web3.eth.sign()
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        bytes32 r;
        bytes32 s;
        uint8 v;

        // Check the signature length
        if (signature.length != 65) {
            return (address(0));
        }

        // Divide the signature in r, s and v variables
        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }

        // Version of signature should be 27 or 28, but 0 and 1 are also possible versions
        if (v < 27) {
            v += 27;
        }

        // If the version is correct return the signer address
        if (v != 27 && v != 28) {
            return (address(0));
        } else {
            return ecrecover(hash, v, r, s);
        }
    }

    /**
     * toEthSignedMessageHash
     * @dev prefix a bytes32 value with "\x19Ethereum Signed Message:"
     * and hash the result
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }
}

contract PauserRole {
    using Roles for Roles.Role;

    event PauserAdded(address indexed account);
    event PauserRemoved(address indexed account);

    Roles.Role private _pausers;

    constructor () internal {
        _addPauser(msg.sender);
    }

    modifier onlyPauser() {
        require(isPauser(msg.sender));
        _;
    }

    function isPauser(address account) public view returns (bool) {
        return _pausers.has(account);
    }

    function addPauser(address account) public onlyPauser {
        _addPauser(account);
    }

    function renouncePauser() public {
        _removePauser(msg.sender);
    }

    function _addPauser(address account) internal {
        _pausers.add(account);
        emit PauserAdded(account);
    }

    function _removePauser(address account) internal {
        _pausers.remove(account);
        emit PauserRemoved(account);
    }
}

contract Pausable is PauserRole {
    event Paused(address account);
    event Unpaused(address account);

    bool private _paused;

    constructor () internal {
        _paused = false;
    }

    /**
     * @return true if the contract is paused, false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!_paused);
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused);
        _;
    }

    /**
     * @dev called by the owner to pause, triggers stopped state
     */
    function pause() public onlyPauser whenNotPaused {
        _paused = true;
        emit Paused(msg.sender);
    }

    /**
     * @dev called by the owner to unpause, returns to normal state
     */
    function unpause() public onlyPauser whenPaused {
        _paused = false;
        emit Unpaused(msg.sender);
    }
}

contract MCHDailyActionV3 is Ownable, Pausable {

  address public validator;
  mapping(address => int64) public lastActionDate;

  event Action(
               address indexed user,
               int64 at
               );

  constructor(address _varidator) public {
    validator = _varidator;
  }

  function setValidater(address _varidator) external onlyOwner() {
    validator = _varidator;
  }

  function requestDailyActionReward(bytes calldata _signature, int64 _time) external whenNotPaused() {
    require(validateSig(msg.sender, _time, _signature), "invalid signature");
    int64 day = _time / 86400;
    require(lastActionDate[msg.sender] < day);
    lastActionDate[msg.sender] = day;
    emit Action(
                msg.sender,
                _time
                );
  }

  function validateSig(address _from, int64 _time, bytes memory _signature) public view returns (bool) {
    require(validator != address(0));
    address signer = recover(ethSignedMessageHash(encodeData(_from, _time)), _signature);
    return (signer == validator);
  }

  function encodeData(address _from, int64 _time) public pure returns (bytes32) {
    return keccak256(abi.encode(
                                _from,
                                _time
                                )
                     );
  }

  function ethSignedMessageHash(bytes32 _data) public pure returns (bytes32) {
    return ECDSA.toEthSignedMessageHash(_data);
  }

  function recover(bytes32 _data, bytes memory _signature) public pure returns (address) {
    return ECDSA.recover(_data, _signature);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000984e7b0f2cb06b847dd465eec65a3a41c1e27c06

-----Decoded View---------------
Arg [0] : _varidator (address): 0x984E7B0f2cB06B847dd465EEc65a3A41C1E27c06

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000984e7b0f2cb06b847dd465eec65a3a41c1e27c06

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bzzr://3e96df1295661dfa2ab4c96e75c50f728f49d93f627eae94b848ee6d9dd0cd30