no-copy/src/main/java/ru/soune/nocopy/service/geo/GeoCountryService.java

package ru.soune.nocopy.service.geo;

import com.maxmind.geoip2.DatabaseReader;
import com.maxmind.geoip2.model.CountryResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.net.InetAddress;

@Service
@Slf4j
public class GeoCountryService {

    private final DatabaseReader dbReader;

    public GeoCountryService() throws IOException {
        Resource resource = new ClassPathResource("geo/GeoLite2-Country.mmdb");
        this.dbReader = new DatabaseReader.Builder(resource.getInputStream()).build();
    }

    public String getCountry(String input) {
        try {
            String domain = extractDomain(input);

            InetAddress ip = InetAddress.getByName(domain);

            CountryResponse response = dbReader.country(ip);

            return response.getCountry().getName();
        } catch (Exception e) {
            log.error("Failed for input: {}", input, e);
            return "UNKNOWN";
        }
    }

    private String extractDomain(String input) {
        if (input == null || input.isEmpty()) {
            throw new IllegalArgumentException("Input is empty");
        }

        String cleaned = input.replaceAll("^https?://", "");
        cleaned = cleaned.split("/")[0];
        cleaned = cleaned.split(":")[0];

        return cleaned;
    }
}