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•  contract IAuthority
•    - function canCall(
•  contract DSAuthEvents
•  contract DSAuth is DSAuthEvents
•    - function setOwner(address owner_)
•    - function setAuthority(IAuthority auth ...
•    - function isAuthorized(address src, by ...
•  contract PausableDSAuth is DSAuth
•    - function pause()
•    - function unpause()
•  contract ERC20Basic
•    - function totalSupply()
•    - function balanceOf(address _who)
•    - function transfer(address _to, uint25 ...
•  contract ERC20 is ERC20Basic
•    - function allowance(address _owner, ad ...
•    - function transferFrom(address _from, ...
•    - function approve(address _spender, ui ...
•  contract IBurnableERC20
•    - function burn(address _from, uint _va ...
•  contract ISettingsRegistry
•    - function uintOf(bytes32 _propertyName ...
•    - function stringOf(bytes32 _propertyNa ...
•    - function addressOf(bytes32 _propertyN ...
•    - function bytesOf(bytes32 _propertyNam ...
•    - function boolOf(bytes32 _propertyName ...
•    - function intOf(bytes32 _propertyName)
•    - function setUintProperty(bytes32 _pro ...
•    - function setStringProperty(bytes32 _p ...
•    - function setAddressProperty(bytes32 _ ...
•    - function setBytesProperty(bytes32 _pr ...
•    - function setBoolProperty(bytes32 _pro ...
•    - function setIntProperty(bytes32 _prop ...
•    - function getValueTypeOf(bytes32 _prop ...
•  contract Issuing is PausableDSAuth *
•    - function tokenFallback(
•    - function addSupportedTokens(address _ ...
•    - function removeSupportedTokens(addres ...
•    - function claimTokens(address _token)

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/**
 *Submitted for verification at Etherscan.io on 2020-10-28
*/

// File: contracts/interfaces/IAuthority.sol

pragma solidity ^0.4.24;

contract IAuthority {
    function canCall(
        address src, address dst, bytes4 sig
    ) public view returns (bool);
}

// File: contracts/DSAuth.sol

pragma solidity ^0.4.24;


contract DSAuthEvents {
    event LogSetAuthority (address indexed authority);
    event LogSetOwner     (address indexed owner);
}

/**
 * @title DSAuth
 * @dev The DSAuth contract is reference implement of https://github.com/dapphub/ds-auth
 * But in the isAuthorized method, the src from address(this) is remove for safty concern.
 */
contract DSAuth is DSAuthEvents {
    IAuthority   public  authority;
    address      public  owner;

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

    function setOwner(address owner_)
        public
        auth
    {
        owner = owner_;
        emit LogSetOwner(owner);
    }

    function setAuthority(IAuthority authority_)
        public
        auth
    {
        authority = authority_;
        emit LogSetAuthority(authority);
    }

    modifier auth {
        require(isAuthorized(msg.sender, msg.sig));
        _;
    }

    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
        if (src == owner) {
            return true;
        } else if (authority == IAuthority(0)) {
            return false;
        } else {
            return authority.canCall(src, this, sig);
        }
    }
}

// File: contracts/PausableDSAuth.sol

pragma solidity ^0.4.24;



/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract PausableDSAuth is DSAuth {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @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 onlyOwner whenNotPaused {
    paused = true;
    emit Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() public onlyOwner whenPaused {
    paused = false;
    emit Unpause();
  }
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol

pragma solidity ^0.4.24;


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * See https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address _who) public view returns (uint256);
  function transfer(address _to, uint256 _value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.4.24;



/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address _owner, address _spender)
    public view returns (uint256);

  function transferFrom(address _from, address _to, uint256 _value)
    public returns (bool);

  function approve(address _spender, uint256 _value) public returns (bool);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

// File: contracts/interfaces/IBurnableERC20.sol

pragma solidity ^0.4.23;

contract IBurnableERC20 {
    function burn(address _from, uint _value) public;
}

// File: contracts/interfaces/ISettingsRegistry.sol

pragma solidity ^0.4.24;

contract ISettingsRegistry {
    enum SettingsValueTypes { NONE, UINT, STRING, ADDRESS, BYTES, BOOL, INT }

    function uintOf(bytes32 _propertyName) public view returns (uint256);

    function stringOf(bytes32 _propertyName) public view returns (string);

    function addressOf(bytes32 _propertyName) public view returns (address);

    function bytesOf(bytes32 _propertyName) public view returns (bytes);

    function boolOf(bytes32 _propertyName) public view returns (bool);

    function intOf(bytes32 _propertyName) public view returns (int);

    function setUintProperty(bytes32 _propertyName, uint _value) public;

    function setStringProperty(bytes32 _propertyName, string _value) public;

    function setAddressProperty(bytes32 _propertyName, address _value) public;

    function setBytesProperty(bytes32 _propertyName, bytes _value) public;

    function setBoolProperty(bytes32 _propertyName, bool _value) public;

    function setIntProperty(bytes32 _propertyName, int _value) public;

    function getValueTypeOf(bytes32 _propertyName) public view returns (uint /* SettingsValueTypes */ );

    event ChangeProperty(bytes32 indexed _propertyName, uint256 _type);
}

// File: contracts/Issuing.sol

pragma solidity ^0.4.24;





contract Issuing is PausableDSAuth {
    // claimedToken event
    event ClaimedTokens(
        address indexed token,
        address indexed owner,
        uint256 amount
    );

    event BurnAndRedeem(
        address indexed token,
        address indexed from,
        uint256 amount,
        bytes receiver
    );

    ISettingsRegistry public registry;

    mapping(address => bool) public supportedTokens;

    constructor(address _registry) public{
        registry = ISettingsRegistry(_registry);
    }

    /**
     * @dev ERC223 fallback function, make sure to check the msg.sender is from target token contracts
     * @param _from - person who transfer token in for deposits or claim deposit with penalty KTON.
     * @param _amount - amount of token.
     * @param _data - data which indicate the operations.
     */
    function tokenFallback(
        address _from,
        uint256 _amount,
        bytes _data
    ) public whenNotPaused {
        bytes32 darwiniaAddress;

        assembly {
            let ptr := mload(0x40)
            calldatacopy(ptr, 0, calldatasize)
            darwiniaAddress := mload(add(ptr, 132))
        }

        //  Only supported tokens can be called
        require(supportedTokens[msg.sender], "Permission denied");
        require(
            _data.length == 32,
            "The address (Darwinia Network) must be in a 32 bytes hexadecimal format"
        );
        require(
            darwiniaAddress != bytes32(0),
            "Darwinia Network Address can't be empty"
        );

        // SettingIds.UINT_BRIDGE_FEE
        uint256 bridgeFee = registry.uintOf(
            0x55494e545f4252494447455f4645450000000000000000000000000000000000
        );

        // SettingIds.CONTRACT_BRIDGE_POOL
        address bridgePool = registry.addressOf(
            0x434f4e54524143545f4252494447455f504f4f4c000000000000000000000000
        );

        // SettingIds.CONTRACT_RING_ERC20_TOKEN
        address ring = registry.addressOf(
            0x434f4e54524143545f52494e475f45524332305f544f4b454e00000000000000
        );

        // BridgeFee will be paid to the relayer
        if (bridgeFee > 0) {
            require(
                ERC20(ring).transferFrom(_from, bridgePool, bridgeFee),
                "Error when paying transaction fees"
            );
        }

        IBurnableERC20(msg.sender).burn(address(this), _amount);
        emit BurnAndRedeem(msg.sender, _from, _amount, _data);
    }

    function addSupportedTokens(address _token) public auth {
        supportedTokens[_token] = true;
    }

    function removeSupportedTokens(address _token) public auth {
        supportedTokens[_token] = false;
    }

    /// @notice This method can be used by the owner to extract mistakenly
    ///  sent tokens to this contract.
    /// @param _token The address of the token contract that you want to recover
    ///  set to 0 in case you want to extract ether.
    function claimTokens(address _token) public auth {
        if (_token == 0x0) {
            owner.transfer(address(this).balance);
            return;
        }
        ERC20 token = ERC20(_token);
        uint256 balance = token.balanceOf(address(this));
        token.transfer(owner, balance);

        emit ClaimedTokens(_token, owner, balance);
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000006b0940772516b69088904564a56d09cfe6bb3d85

-----Decoded View---------------
Arg [0] : _registry (address): 0x6B0940772516B69088904564A56d09CFe6Bb3D85

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000006b0940772516b69088904564a56d09cfe6bb3d85

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