pragma solidity ^0.5.16;

contract ProductionDetector {
  address[27] validators = [
    0x295e26495CEF6F69dFA69911d9D8e4F3bBadB89B,
    0x0BAC492386862aD3dF4B666Bc096b0505BB694Da,
    0xFE6E72b223f6d6Cf4edc6bFf92f30e84b8258249,
    0xee226379dB83CfFC681495730c11fDDE79BA4c0C,
    0xea0A6E3c511bbD10f4519EcE37Dc24887e11b55d,
    0xE9AE3261a475a27Bb1028f140bc2a7c843318afD,
    0xe2d3A739EFFCd3A99387d015E260eEFAc72EBea1,
    0xCc8E6d00C17eB431350C6c50d8b8F05176b90b11,
    0xBe807Dddb074639cD9fA61b47676c064fc50D62C,
    0xAAcF6a8119F7e11623b5A43DA638e91F669A130f,
    0xa6f79B60359f141df90A0C745125B131cAAfFD12,
    0x9F8cCdaFCc39F3c7D6EBf637c9151673CBc36b88,
    0x8b6C8fd93d6F4CeA42Bbb345DBc6F0DFdb5bEc73,
    0x7AE2F5B9e386cd1B50A4550696D957cB4900f03a,
    0x72b61c6014342d914470eC7aC2975bE345796c2b,
    0x70F657164e5b75689b64B7fd1fA275F334f28e18,
    0x685B1ded8013785d6623CC18D214320b6Bb64759,
    0x61Dd481A114A2E761c554B641742C973867899D3,
    0x4430b3230294D12c6AB2aAC5C2cd68E80B16b581,
    0x3f349bBaFEc1551819B8be1EfEA2fC46cA749aA1,
    0x2D4C407BBe49438ED859fe965b140dcF1aaB71a9,
    0x2465176C461AfB316ebc773C61fAEe85A6515DAA,
    0xac0E15a038eedfc68ba3C35c73feD5bE4A07afB5,
    0xB8f7166496996A7da21cF1f1b04d9B3E26a3d077
  ];
  constructor() public {}

  modifier onlyProduction {
    require(
        isProduction(),
        "not in production"
    );
    _;
  }

  function isProduction() public view returns (bool) {
    address coinbase = block.coinbase;
    for (uint i = 0; i < validators.length; i++) {
        if (validators[i] == coinbase) {
            return true;
        }
    }
    return false;
  }
}