62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
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package main
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import (
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"encoding/json"
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"fmt"
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"net"
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"net/http"
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"strings"
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)
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type IPAddressResponse struct {
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IPv4Address string `json:"ipv4_address"`
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IPv6Address string `json:"ipv6_address"`
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}
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func getIPHandler(w http.ResponseWriter, r *http.Request) {
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ipHeader := r.Header.Get("X-Real-IP")
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if ipHeader == "" {
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http.Error(w, "X-Real-IP Header nicht vorhanden", http.StatusBadRequest)
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return
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}
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ip := strings.TrimSpace(strings.SplitN(ipHeader, ",", 2)[0]) // Um den Fall mit mehreren IP-Adressen zu behandeln
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ipResponse := IPAddressResponse{
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IPv4Address: getIPv4(ip),
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IPv6Address: getIPv6(ip),
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}
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jsonResponse, err := json.Marshal(ipResponse)
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if err != nil {
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http.Error(w, fmt.Sprintf("Fehler beim Erstellen der JSON-Antwort: %s", err), http.StatusInternalServerError)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.Write(jsonResponse)
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}
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func getIPv4(ip string) string {
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ipAddr := net.ParseIP(ip)
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ipv4 := ipAddr.To4()
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if ipv4 != nil {
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return ipv4.String()
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}
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return ""
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}
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func getIPv6(ip string) string {
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ipAddr := net.ParseIP(ip)
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ipv6 := ipAddr.To16()
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if ipv6 != nil && strings.Contains(ip, ":") {
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return ipv6.String()
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}
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return ""
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}
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func main() {
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http.HandleFunc("/getip", getIPHandler)
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http.ListenAndServe(":8080", nil)
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}
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