resolver.java

package com.homework.services;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.homework.exceptions.CountryResolverException;
import com.homework.models.Country;
import com.homework.repositories.CountryRepo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Service;

import java.net.URI;
import java.net.URISyntaxException;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

@Service
@Configurable
@PropertySource("classpath:application.properties")
public class CountryResolver {

    @Value("${api.notASecret}")
    private String accessToken;

    private final ObjectMapper mapper = new ObjectMapper().configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

    public Country resolveCountry(String ip) throws CountryResolverException {
        try {
            return tryResolveCountry(ip);
        } catch (Exception e) {
            throw new CountryResolverException("Couldn't resolve country", e);
        }
    }

    private Country tryResolveCountry(String ip) throws URISyntaxException, java.io.IOException, InterruptedException {
        var request = HttpRequest.newBuilder()
                .uri(new URI(String.format("http://api.ipstack.com/%s?access_key=%s", ip, accessToken))).GET()
                .build();

        var response = HttpClient.newHttpClient().send(request,
                HttpResponse.BodyHandlers.ofString());

        var resp = mapper.readValue(response.body(), CountryDto.class);
        return new Country(resp.code, resp.name);
    }

    static class CountryDto {
        @JsonProperty("country_code")
        public String code;

        @JsonProperty("country_name")
        public String name;
    }

}