Feature: log out country, region and city of IP

internal/publicip/info.go

@@ -0,0 +1,54 @@
+package publicip
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+	"strings"
+
+	"github.com/qdm12/gluetun/internal/constants"
+)
+
+type ipInfoData struct {
+	Region  string `json:"region"`
+	Country string `json:"country"`
+	City    string `json:"city"`
+}
+
+var ErrBadHTTPStatus = errors.New("bad HTTP status received")
+
+func Info(ctx context.Context, client *http.Client, ip net.IP) ( //nolint:interfacer
+	country, region, city string, err error) {
+	const baseURL = "https://ipinfo.io/"
+	url := baseURL + ip.String()
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return "", "", "", err
+	}
+
+	response, err := client.Do(request)
+	if err != nil {
+		return "", "", "", err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return "", "", "", fmt.Errorf("%w: %d", ErrBadHTTPStatus, response.StatusCode)
+	}
+
+	decoder := json.NewDecoder(response.Body)
+	var data ipInfoData
+	if err := decoder.Decode(&data); err != nil {
+		return "", "", "", err
+	}
+
+	countryCode := strings.ToLower(data.Country)
+	country, ok := constants.CountryCodes()[countryCode]
+	if !ok {
+		country = data.Country
+	}
+	return country, data.Region, data.City, nil
+}