Facti13.Web.Backend.Java.V2/src/main/java/app/utils/RealIPService.java

package app.utils;

import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.time.Instant;
import java.util.HashMap;

public class RealIPService {
    private final RestTemplate restTemplate;
    private final long lst_update = 0;
    private String lst_ip = "";

    public RealIPService() {
        this.restTemplate =  new RestTemplate();
    }

    public String getIP() {
        if (Instant.now().getEpochSecond() - lst_update < 300)
            return lst_ip;

        try {
            HashMap response = restTemplate.getForEntity("https://ifconfig.co/json", HashMap.class).getBody();
            lst_ip = (String) response.getOrDefault("ip", "");
        } catch (Exception e) {}
        return lst_ip;
    }

    public String genIPWithPort(Integer port) {
        return new StringBuilder().append(getIP()).append(":").append(port).toString();
    }

}