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package main
import (
"encoding/json"
"flag"
"fmt"
"log"
"net"
"net/http"
"strconv"
"github.com/oschwald/geoip2-golang"
)
func floatToString(num float64) string {
return strconv.FormatFloat(num, 'f', 6, 64)
}
func getRemoteIP(req *http.Request) string {
forward := req.Header.Get("X-Forwarded-For")
ipstr := ""
if forward != "" {
ipstr = forward
} else {
ip, _, err := net.SplitHostPort(req.RemoteAddr)
if err != nil {
log.Fatal(err)
}
netIP := net.ParseIP(ip)
ipstr = netIP.String()
}
return ipstr
}
type geodb struct {
db *geoip2.Reader
}
func (g *geodb) getRecordForIP(ipstr string) *geoip2.City {
ip := net.ParseIP(ipstr)
record, err := g.db.City(ip)
if err != nil {
log.Fatal(err)
}
return record
}
type jsonHandler struct {
geoipdb *geodb
}
func (jh *jsonHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
ipstr := getRemoteIP(req)
record := jh.geoipdb.getRecordForIP(ipstr)
data := map[string]string{
"ip": ipstr,
"cc": record.Country.IsoCode,
"city": record.City.Names["en"],
"lat": floatToString(record.Location.Latitude),
"lon": floatToString(record.Location.Longitude),
}
dataJSON, _ := json.Marshal(data)
fmt.Fprintf(w, string(dataJSON))
}
type txtHandler struct {
geoipdb *geodb
}
func (th *txtHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
ipstr := getRemoteIP(req)
record := th.geoipdb.getRecordForIP(ipstr)
fmt.Fprintf(w, "Your IP: %s\n", ipstr)
fmt.Fprintf(w, "Your Country: %s\n", record.Country.IsoCode)
fmt.Fprintf(w, "Your City: %s\n", record.City.Names["en"])
fmt.Fprintf(w, "Your Coordinates: %s, %s\n",
floatToString(record.Location.Latitude),
floatToString(record.Location.Longitude))
}
func main() {
var port = flag.Int("port", 9001, "port where the service listens on")
var dbpath = flag.String("geodb", "/var/lib/GeoIP/GeoLite2-City.mmdb", "path to the GeoLite2-City database")
flag.Parse()
db, err := geoip2.Open(*dbpath)
if err != nil {
log.Fatal(err)
}
defer db.Close()
geoipdb := geodb{db}
mux := http.NewServeMux()
jh := &jsonHandler{&geoipdb}
mux.Handle("/json", jh)
th := &txtHandler{&geoipdb}
mux.Handle("/", th)
log.Println("Started Geolocation Service")
log.Printf("Listening on port %v...\n", *port)
http.ListenAndServe(":"+strconv.Itoa(*port), mux)
}
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