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/**
 *Submitted for verification at Etherscan.io on 2021-04-28
*/

// File: @axie/contract-library/contracts/access/HasAdmin.sol

pragma solidity ^0.5.2;


contract HasAdmin {
  event AdminChanged(address indexed _oldAdmin, address indexed _newAdmin);
  event AdminRemoved(address indexed _oldAdmin);

  address public admin;

  modifier onlyAdmin {
    require(msg.sender == admin);
    _;
  }

  constructor() internal {
    admin = msg.sender;
    emit AdminChanged(address(0), admin);
  }

  function changeAdmin(address _newAdmin) external onlyAdmin {
    require(_newAdmin != address(0));
    emit AdminChanged(admin, _newAdmin);
    admin = _newAdmin;
  }

  function removeAdmin() external onlyAdmin {
    emit AdminRemoved(admin);
    admin = address(0);
  }
}

// File: @axie/contract-library/contracts/proxy/ProxyStorage.sol

pragma solidity ^0.5.2;

/**
 * @title ProxyStorage
 * @dev Store the address of logic contact that the proxy should forward to.
 */
contract ProxyStorage is HasAdmin {
  address internal _proxyTo;
}

// File: @axie/contract-library/contracts/proxy/Proxy.sol

pragma solidity ^0.5.2;


/**
 * @title Proxy
 * @dev Gives the possibility to delegate any call to a foreign implementation.
 */
contract Proxy is ProxyStorage {

  event ProxyUpdated(address indexed _new, address indexed _old);

  constructor(address _proxyTo) public {
    updateProxyTo(_proxyTo);
  }

  /**
  * @dev Tells the address of the implementation where every call will be delegated.
  * @return address of the implementation to which it will be delegated
  */
  function implementation() public view returns (address) {
    return _proxyTo;
  }

  /**
  * @dev See more at: https://eips.ethereum.org/EIPS/eip-897
  * @return type of proxy - always upgradable
  */
  function proxyType() external pure returns (uint256) {
      // Upgradeable proxy
      return 2;
  }

  /**
  * @dev Fallback function allowing to perform a delegatecall to the given implementation.
  * This function will return whatever the implementation call returns
  */
  function () payable external {
    address _impl = implementation();
    require(_impl != address(0));

    assembly {
      let ptr := mload(0x40)
      calldatacopy(ptr, 0, calldatasize)
      let result := delegatecall(gas, _impl, ptr, calldatasize, 0, 0)
      let size := returndatasize
      returndatacopy(ptr, 0, size)

      switch result
      case 0 { revert(ptr, size) }
      default { return(ptr, size) }
    }
  }

  function updateProxyTo(address _newProxyTo) public onlyAdmin {
    require(_newProxyTo != address(0x0));

    _proxyTo = _newProxyTo;
    emit ProxyUpdated(_newProxyTo, _proxyTo);
  }
}

// File: @axie/contract-library/contracts/lifecycle/Pausable.sol

pragma solidity ^0.5.2;



contract Pausable is HasAdmin {
  event Paused();
  event Unpaused();

  bool public paused;

  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  modifier whenPaused() {
    require(paused);
    _;
  }

  function pause() public onlyAdmin whenNotPaused {
    paused = true;
    emit Paused();
  }

  function unpause() public onlyAdmin whenPaused {
    paused = false;
    emit Unpaused();
  }
}

// File: @axie/contract-library/contracts/math/SafeMath.sol

pragma solidity ^0.5.2;


library SafeMath {
  function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
    c = a + b;
    require(c >= a);
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256 c) {
    require(b <= a);
    return a - b;
  }

  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    if (a == 0) {
      return 0;
    }

    c = a * b;
    require(c / a == b);
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256 c) {
    // Since Solidity automatically asserts when dividing by 0,
    // but we only need it to revert.
    require(b > 0);
    return a / b;
  }

  function mod(uint256 a, uint256 b) internal pure returns (uint256 c) {
    // Same reason as `div`.
    require(b > 0);
    return a % b;
  }

  function ceilingDiv(uint256 a, uint256 b) internal pure returns (uint256 c) {
    return add(div(a, b), mod(a, b) > 0 ? 1 : 0);
  }

  function subU64(uint64 a, uint64 b) internal pure returns (uint64 c) {
    require(b <= a);
    return a - b;
  }

  function addU8(uint8 a, uint8 b) internal pure returns (uint8 c) {
    c = a + b;
    require(c >= a);
  }
}

// File: contracts/chain/common/IValidator.sol

pragma solidity ^0.5.17;


contract IValidator {
  event ValidatorAdded(uint256 indexed _id, address indexed _validator);
  event ValidatorRemoved(uint256 indexed _id, address indexed _validator);
  event ThresholdUpdated(
    uint256 indexed _id,
    uint256 indexed _numerator,
    uint256 indexed _denominator,
    uint256 _previousNumerator,
    uint256 _previousDenominator
  );

  function isValidator(address _addr) public view returns (bool);
  function getValidators() public view returns (address[] memory _validators);

  function checkThreshold(uint256 _voteCount) public view returns (bool);
}

// File: contracts/chain/common/Validator.sol

pragma solidity ^0.5.17;




contract Validator is IValidator {
  using SafeMath for uint256;

  mapping(address => bool) validatorMap;
  address[] public validators;
  uint256 public validatorCount;

  uint256 public num;
  uint256 public denom;

  constructor(address[] memory _validators, uint256 _num, uint256 _denom)
    public
  {
    validators = _validators;
    validatorCount = _validators.length;

    for (uint256 _i = 0; _i < validatorCount; _i++) {
      address _validator = _validators[_i];
      validatorMap[_validator] = true;
    }

    num = _num;
    denom = _denom;
  }

  function isValidator(address _addr)
    public
    view
    returns (bool)
  {
    return validatorMap[_addr];
  }

  function getValidators()
    public
    view
    returns (address[] memory _validators)
  {
    _validators = validators;
  }

  function checkThreshold(uint256 _voteCount)
    public
    view
    returns (bool)
  {
    return _voteCount.mul(denom) >= num.mul(validatorCount);
  }

  function _addValidator(uint256 _id, address _validator)
    internal
  {
    require(!validatorMap[_validator]);

    validators.push(_validator);
    validatorMap[_validator] = true;
    validatorCount++;

    emit ValidatorAdded(_id, _validator);
  }

  function _removeValidator(uint256 _id, address _validator)
    internal
  {
    require(isValidator(_validator));

    uint256 _index;
    for (uint256 _i = 0; _i < validatorCount; _i++) {
      if (validators[_i] == _validator) {
        _index = _i;
        break;
      }
    }

    validatorMap[_validator] = false;
    validators[_index] = validators[validatorCount - 1];
    validators.pop();

    validatorCount--;

    emit ValidatorRemoved(_id, _validator);
  }

  function _updateQuorum(uint256 _id, uint256 _numerator, uint256 _denominator)
    internal
  {
    require(_numerator <= _denominator);
    uint256 _previousNumerator = num;
    uint256 _previousDenominator = denom;

    num = _numerator;
    denom = _denominator;

    emit ThresholdUpdated(
      _id,
      _numerator,
      _denominator,
      _previousNumerator,
      _previousDenominator
    );
  }
}

// File: contracts/chain/mainchain/MainchainValidator.sol

pragma solidity ^0.5.17;




/**
 * @title Validator
 * @dev Simple validator contract
 */
contract MainchainValidator is Validator, HasAdmin {
  uint256 nonce;

  constructor(
    address[] memory _validators,
    uint256 _num,
    uint256 _denom
  ) Validator(_validators, _num, _denom) public {
  }

  function addValidators(address[] calldata _validators) external onlyAdmin {
    for (uint256 _i; _i < _validators.length; ++_i) {
      _addValidator(nonce++, _validators[_i]);
    }
  }

  function removeValidator(address _validator) external onlyAdmin {
    _removeValidator(nonce++, _validator);
  }

  function updateQuorum(uint256 _numerator, uint256 _denominator) external onlyAdmin {
    _updateQuorum(nonce++, _numerator, _denominator);
  }
}

// File: contracts/chain/common/Registry.sol

pragma solidity ^0.5.17;



contract Registry is HasAdmin {

  event ContractAddressUpdated(
    string indexed _name,
    bytes32 indexed _code,
    address indexed _newAddress
  );

  event TokenMapped(
    address indexed _mainchainToken,
    address indexed _sidechainToken,
    uint32 _standard
  );

  string public constant GATEWAY = "GATEWAY";
  string public constant WETH_TOKEN = "WETH_TOKEN";
  string public constant VALIDATOR = "VALIDATOR";
  string public constant ACKNOWLEDGEMENT = "ACKNOWLEDGEMENT";

  struct TokenMapping {
    address mainchainToken;
    address sidechainToken;
    uint32 standard; // 20, 721 or any other standards
  }

  mapping(bytes32 => address) public contractAddresses;
  mapping(address => TokenMapping) public mainchainMap;
  mapping(address => TokenMapping) public sidechainMap;

  function getContract(string calldata _name)
    external
    view
    returns (address _address)
  {
    bytes32 _code = getCode(_name);
    _address = contractAddresses[_code];
    require(_address != address(0));
  }

  function isTokenMapped(address _token, uint32 _standard, bool _isMainchain)
    external
    view
    returns (bool)
  {
    TokenMapping memory _mapping = _getTokenMapping(_token, _isMainchain);

    return _mapping.mainchainToken != address(0) &&
      _mapping.sidechainToken != address(0) &&
      _mapping.standard == _standard;
  }

  function updateContract(string calldata _name, address _newAddress)
    external
    onlyAdmin
  {
    bytes32 _code = getCode(_name);
    contractAddresses[_code] = _newAddress;

    emit ContractAddressUpdated(_name, _code, _newAddress);
  }

  function mapToken(address _mainchainToken, address _sidechainToken, uint32 _standard)
    external
    onlyAdmin
  {
    TokenMapping memory _map = TokenMapping(
      _mainchainToken,
      _sidechainToken,
      _standard
    );

    mainchainMap[_mainchainToken] = _map;
    sidechainMap[_sidechainToken] = _map;

    emit TokenMapped(
      _mainchainToken,
      _sidechainToken,
      _standard
    );
  }

  function clearMapToken(address _mainchainToken, address _sidechainToken)
    external
    onlyAdmin
  {
    TokenMapping storage _mainchainMap = mainchainMap[_mainchainToken];
    _clearMapEntry(_mainchainMap);

    TokenMapping storage _sidechainMap = sidechainMap[_sidechainToken];
    _clearMapEntry(_sidechainMap);
  }

  function getMappedToken(
    address _token,
    bool _isMainchain
  )
    external
    view
  returns (
    address _mainchainToken,
    address _sidechainToken,
    uint32 _standard
  )
  {
    TokenMapping memory _mapping = _getTokenMapping(_token, _isMainchain);
    _mainchainToken = _mapping.mainchainToken;
    _sidechainToken = _mapping.sidechainToken;
    _standard = _mapping.standard;
  }

  function getCode(string memory _name)
    public
    pure
    returns (bytes32)
  {
    return keccak256(abi.encodePacked(_name));
  }

  function _getTokenMapping(
    address _token,
    bool isMainchain
  )
    internal
    view
    returns (TokenMapping memory _mapping)
  {
    if (isMainchain) {
      _mapping = mainchainMap[_token];
    } else {
      _mapping = sidechainMap[_token];
    }
  }

  function _clearMapEntry(TokenMapping storage _entry)
    internal
  {
    _entry.mainchainToken = address(0);
    _entry.sidechainToken = address(0);
    _entry.standard = 0;
  }
}

// File: contracts/chain/mainchain/MainchainGatewayStorage.sol

pragma solidity ^0.5.17;







/**
 * @title GatewayStorage
 * @dev Storage of deposit and withdraw information.
 */
contract MainchainGatewayStorage is ProxyStorage, Pausable {

  event TokenDeposited(
    uint256 indexed _depositId,
    address indexed _owner,
    address indexed _tokenAddress,
    address _sidechainAddress,
    uint32  _standard,
    uint256 _tokenNumber // ERC-20 amount or ERC721 tokenId
  );

  event TokenWithdrew(
    uint256 indexed _withdrawId,
    address indexed _owner,
    address indexed _tokenAddress,
    uint256 _tokenNumber
  );

  struct DepositEntry {
    address owner;
    address tokenAddress;
    address sidechainAddress;
    uint32  standard;
    uint256 tokenNumber;
  }

  struct WithdrawalEntry {
    address owner;
    address tokenAddress;
    uint256 tokenNumber;
  }

  Registry public registry;

  uint256 public depositCount;
  DepositEntry[] public deposits;
  mapping(uint256 => WithdrawalEntry) public withdrawals;

  function updateRegistry(address _registry) external onlyAdmin {
    registry = Registry(_registry);
  }
}

// File: contracts/chain/mainchain/MainchainGatewayProxy.sol

pragma solidity ^0.5.17;






contract MainchainGatewayProxy is Proxy, MainchainGatewayStorage {
  constructor(address _proxyTo, address _registry)
    public
    Proxy(_proxyTo)
  {
    registry = Registry(_registry);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_proxyTo","type":"address"},{"internalType":"address","name":"_registry","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_oldAdmin","type":"address"},{"indexed":true,"internalType":"address","name":"_newAdmin","type":"address"}],"name":"AdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_oldAdmin","type":"address"}],"name":"AdminRemoved","type":"event"},{"anonymous":false,"inputs":[],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_new","type":"address"},{"indexed":true,"internalType":"address","name":"_old","type":"address"}],"name":"ProxyUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_depositId","type":"uint256"},{"indexed":true,"internalType":"address","name":"_owner","type":"address"},{"indexed":true,"internalType":"address","name":"_tokenAddress","type":"address"},{"indexed":false,"internalType":"address","name":"_sidechainAddress","type":"address"},{"indexed":false,"internalType":"uint32","name":"_standard","type":"uint32"},{"indexed":false,"internalType":"uint256","name":"_tokenNumber","type":"uint256"}],"name":"TokenDeposited","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_withdrawId","type":"uint256"},{"indexed":true,"internalType":"address","name":"_owner","type":"address"},{"indexed":true,"internalType":"address","name":"_tokenAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"_tokenNumber","type":"uint256"}],"name":"TokenWithdrew","type":"event"},{"anonymous":false,"inputs":[],"name":"Unpaused","type":"event"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":true,"inputs":[],"name":"admin","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_newAdmin","type":"address"}],"name":"changeAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"depositCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"deposits","outputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"address","name":"sidechainAddress","type":"address"},{"internalType":"uint32","name":"standard","type":"uint32"},{"internalType":"uint256","name":"tokenNumber","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"proxyType","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[],"name":"registry","outputs":[{"internalType":"contract Registry","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"removeAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"unpause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_newProxyTo","type":"address"}],"name":"updateProxyTo","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_registry","type":"address"}],"name":"updateRegistry","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"withdrawals","outputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"tokenNumber","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]

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0000000000000000000000008407dc57739bcda7aa53ca6f12f82f9d51c2f21e00000000000000000000000033e71e649abdc09f650ad44139674828a2075ad2

-----Decoded View---------------
Arg [0] : _proxyTo (address): 0x8407dc57739bCDA7aA53Ca6F12F82F9d51c2F21E
Arg [1] : _registry (address): 0x33E71e649Abdc09f650AD44139674828a2075AD2

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000008407dc57739bcda7aa53ca6f12f82f9d51c2f21e
Arg [1] : 00000000000000000000000033e71e649abdc09f650ad44139674828a2075ad2

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bzzr://2489cc87c94756bca4cb382b1aa499a969d11bc469ee7a3912746a14c5c7862a