1. Whitelist Manager

Create the whitelist security layer

interface IWhitelist {
    function usersWhitelisted(address user) external view returns (bool);
}

IWhitelist public whitelist;

constructor(address _whitelist) {
  whitelist = IWhitelist(_whitelist);
  betaAccessEnabled = true;
}
                  

2. Modifier

Create the modifier to check if the user is whitelisted. You can also add a betaAccessEnabled flag to control access.

modifier onlyWhitelisted() {
  if (betaAccessEnabled && !whitelist.usersWhitelisted(msg.sender)) {
    revert UserNotWhitelistedAndBetaAccessIsEnabled();
  }
  _;
}
                  

Usage Example

function test() public view onlyWhitelisted {
  // Your logic here
}