/
server.go
52 lines (42 loc) · 835 Bytes
/
server.go
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package main
import (
"encoding/json"
"flag"
"fmt"
"log"
"net/http"
"github.com/sebest/xff"
)
type output struct {
Addr string `json:"addr"`
}
var (
port *int
)
func init() {
port = flag.Int("port", 80, "the port to listen on")
flag.Parse()
}
func handler() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
data, err := json.Marshal(output{
Addr: r.RemoteAddr,
})
if err != nil {
log.Println(err)
w.WriteHeader(http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
if _, err := w.Write(data); err != nil {
log.Println(err)
}
})
}
func main() {
server := xff.Handler(handler())
addr := fmt.Sprintf(":%d", *port)
if err := http.ListenAndServe(addr, server); err != nil {
log.Fatal(err)
}
}