119 lines
2.3 KiB
Go
119 lines
2.3 KiB
Go
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package main
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import (
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"encoding/json"
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"log"
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"net/http"
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"net/netip"
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)
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// @title My IP
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// @version 0.1
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// @description Get the requseters Real IP, based on HTTP Requests
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func main() {
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handler := http.NewServeMux()
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handler.HandleFunc("/", handleRoot)
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log.Fatal(http.ListenAndServe(":8080", handler))
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}
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type ResponseType string
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const (
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TEXT ResponseType = "TEXT"
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JSON ResponseType = "JSON"
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DEFAULT ResponseType = TEXT
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)
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func (r *ResponseType) IsValid() bool {
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// This is pretty ugly
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// TODO: Comapre with ignore-case
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if *r == TEXT {
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return true
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}
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if *r == JSON {
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return true
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}
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return false
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}
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func handleRoot(w http.ResponseWriter, r *http.Request) {
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if r.Method != "GET" {
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w.WriteHeader(http.StatusBadRequest)
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}
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var Type ResponseType
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Type = ResponseType(r.URL.Query().Get("t"))
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if !Type.IsValid() {
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// Using defualt
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Type = DEFAULT
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}
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log.Printf("Type: %v\n", Type)
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ip := determineRealIP(r)
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w.WriteHeader(http.StatusOK)
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err := writeFormattedIP(w, Type, ip)
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if err != nil {
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log.Println(err.Error())
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w.WriteHeader(http.StatusInternalServerError)
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}
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}
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func determineRealIP(r *http.Request) string {
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ip := r.RemoteAddr
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xRealIP := r.Header.Get("X-Real-IP")
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if xRealIP != "" {
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ip = xRealIP
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}
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ipPort, err := netip.ParseAddrPort(ip)
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if err != nil {
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log.Println("Error while parsing AddrPort:", err.Error())
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}
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ipAddrPort := ipPort.Addr().String()
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if ipAddrPort == "invalid IP" {
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ipAddr, err := netip.ParseAddr(ip)
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if err != nil {
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// Last resort
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log.Println("Error while parsing Addr:", err.Error())
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return ip
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}
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ip = ipAddr.String()
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}
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return ip
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}
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func writeFormattedIP(w http.ResponseWriter, Type ResponseType, ip string) error {
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if Type == TEXT {
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_, err := w.Write([]byte(ip))
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if err != nil {
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return err
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}
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return nil
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}
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if Type == JSON {
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// TODO: Use MarshalIndent
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jsonResponse, err := json.Marshal(map[string]string{"ip": ip})
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if err != nil {
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return err
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}
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_, err = w.Write(jsonResponse)
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if err != nil {
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return err
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}
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}
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return nil
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}
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