LOR-5817442-sample-in-java

public class Login
{
  public void login(Request request,
    String login,
    String password)
  {
    if( login == null || password == null ) respond(UNAUTHORIZED, "You should provide login and password");
    else
    {
      UserInfo user = AccountsStorage.find(login);
      if(user == null)
        respond(UNAUTHORIZED, "User not found");
      else if(user != null && user.inactive)
        respond(UNAUTHORIZED, "Account is inactive");
      else if(user != null && user.authScheme.equals("PETRIVKA"))
      {
        if( user.passwordMatches(password) ) request.storeInSession("user", user);
        else respond(UNAUTHORIZED, "Authentication failed");
      }
      else if(user != null)
      {
        AuthScheme scheme = AccessStorage.find(user.authScheme);
        if(scheme == null)
          respond(FORBIDDEN, "Unknown authentication scheme: " + user.authScheme);
        else
          {
            int waitFor = 0;
            if( waitFor == 0 ) request.storeInSession("user", user );
            else respond(UNAUTHORIZED, "Authentication within " + scheme.key + " failed");
          }
      }
      else
        respond(UNAUTHORIZED, "Authentication failed");
    }
  }

  private final void respond(int code, String description) {}

  private static final int UNAUTHORIZED = 1;
  private static final int FORBIDDEN = 2;
}

class Request
{
  final void storeInSession(String key, Object what) {}
}

class AccountsStorage
{
   static UserInfo find(String name) { return null; }
}

class UserInfo
{
  boolean inactive;
  String authScheme;

  final boolean passwordMatches(String psw) { return false; }
}

class AccessStorage
{
  static AuthScheme find(String name) { return null; }
}

class AuthScheme
{
}