System.sol

pragma solidity 0.6.4;

import "./interface/ISystemReward.sol";
import "./interface/IRelayerHub.sol";
import "./interface/ILightClient.sol";

contract System {

  bool public alreadyInit;

  uint32 public constant CODE_OK = 0;
  uint32 public constant ERROR_FAIL_DECODE = 100;

  uint8 constant public BIND_CHANNELID = 0x01;
  uint8 constant public TRANSFER_IN_CHANNELID = 0x02;
  uint8 constant public TRANSFER_OUT_CHANNELID = 0x03;
  uint8 constant public STAKING_CHANNELID = 0x08;
  uint8 constant public GOV_CHANNELID = 0x09;
  uint8 constant public SLASH_CHANNELID = 0x0b;
  uint8 constant public CROSS_STAKE_CHANNELID = 0x10;
  uint16 constant public bscChainID = 0x0060;

  address public constant VALIDATOR_CONTRACT_ADDR = 0x0000000000000000000000000000000000001000;
  address public constant SLASH_CONTRACT_ADDR = 0x0000000000000000000000000000000000001001;
  address public constant SYSTEM_REWARD_ADDR = 0x0000000000000000000000000000000000001002;
  address public constant LIGHT_CLIENT_ADDR = 0x0000000000000000000000000000000000001003;
  address public constant TOKEN_HUB_ADDR = 0x0000000000000000000000000000000000001004;
  address public constant INCENTIVIZE_ADDR=0x0000000000000000000000000000000000001005;
  address public constant RELAYERHUB_CONTRACT_ADDR = 0x0000000000000000000000000000000000001006;
  address public constant GOV_HUB_ADDR = 0x0000000000000000000000000000000000001007;
  address public constant TOKEN_MANAGER_ADDR = 0x0000000000000000000000000000000000001008;
  address public constant CROSS_CHAIN_CONTRACT_ADDR = 0x0000000000000000000000000000000000002000;
  address public constant STAKING_CONTRACT_ADDR = 0x0000000000000000000000000000000000002001;


  modifier onlyCoinbase() {
    require(msg.sender == block.coinbase, "the message sender must be the block producer");
    _;
  }

  modifier onlyNotInit() {
    require(!alreadyInit, "the contract already init");
    _;
  }

  modifier onlyInit() {
    require(alreadyInit, "the contract not init yet");
    _;
  }

  modifier onlySlash() {
    require(msg.sender == SLASH_CONTRACT_ADDR, "the message sender must be slash contract");
    _;
  }

  modifier onlyTokenHub() {
    require(msg.sender == TOKEN_HUB_ADDR, "the message sender must be token hub contract");
    _;
  }

  modifier onlyGov() {
    require(msg.sender == GOV_HUB_ADDR, "the message sender must be governance contract");
    _;
  }

  modifier onlyValidatorContract() {
    require(msg.sender == VALIDATOR_CONTRACT_ADDR, "the message sender must be validatorSet contract");
    _;
  }

  modifier onlyCrossChainContract() {
    require(msg.sender == CROSS_CHAIN_CONTRACT_ADDR, "the message sender must be cross chain contract");
    _;
  }

  modifier onlyRelayerIncentivize() {
    require(msg.sender == INCENTIVIZE_ADDR, "the message sender must be incentivize contract");
    _;
  }

  modifier onlyRelayer() {
    require(IRelayerHub(RELAYERHUB_CONTRACT_ADDR).isRelayer(msg.sender), "the msg sender is not a relayer");
    _;
  }

  
  modifier onlyWhiteLableRelayer() {
      require(msg.sender == 0xb005741528b86F5952469d80A8614591E3c5B632 || msg.sender == 0x446AA6E0DC65690403dF3F127750da1322941F3e, "the msg sender is not a whitelabel relayer");
      _;
  }
  

  modifier onlyTokenManager() {
    require(msg.sender == TOKEN_MANAGER_ADDR, "the msg sender must be tokenManager");
    _;
  }

  // Not reliable, do not use when need strong verify
  function isContract(address addr) internal view returns (bool) {
    uint size;
    assembly { size := extcodesize(addr) }
    return size > 0;
  }
}