mirror of https://github.com/mpolden/echoip
59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
package main
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import (
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"fmt"
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"html/template"
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"io"
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"log"
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"net"
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"net/http"
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"regexp"
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)
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type Client struct {
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Host string
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}
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func isCli(userAgent string) bool {
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match, _ := regexp.MatchString("^(?i)(curl|wget|fetch\\slibfetch)\\/.*$",
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userAgent)
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return match
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}
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func handler(w http.ResponseWriter, req *http.Request) {
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if req.Method != "GET" {
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http.Error(w, "Invalid request method", 405)
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return
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}
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var host string
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var err error
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realIP := req.Header.Get("X-Real-IP")
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if realIP != "" {
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host = realIP
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} else {
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host, _, err = net.SplitHostPort(req.RemoteAddr)
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}
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if err != nil {
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log.Printf("Failed to parse remote address: %s\n", req.RemoteAddr)
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http.Error(w, "Failed to parse remote address", 500)
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return
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}
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if isCli(req.UserAgent()) {
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io.WriteString(w, fmt.Sprintf("%s\n", host))
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} else {
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t, _ := template.ParseFiles("index.html")
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client := &Client{Host: host}
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t.Execute(w, client)
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}
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}
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func main() {
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http.HandleFunc("/", handler)
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err := http.ListenAndServe(":8080", nil)
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if err != nil {
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log.Fatal("ListenAndServe: ", err)
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}
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}
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