uploader.go

package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"net/http/httputil"
	"os"
	"time"
)

func errorResponse(w http.ResponseWriter, err error) {
	w.WriteHeader(500)
	fmt.Fprintf(w, err.Error())
	fmt.Printf("500 %s %s\n", time.Now(), err.Error())
}

func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		reqdump, err := httputil.DumpRequest(r, false)
		if err != nil {
			errorResponse(w, err)
			return
		}
		fmt.Printf("%s\n", reqdump)

		buf, err := ioutil.ReadAll(r.Body)
		defer r.Body.Close()
		if err != nil {
			errorResponse(w, err)
			return
		}

		now := time.Now()
		filepath := fmt.Sprintf("./images/%d.png", now.Unix())
		file, err := os.Create(filepath)
		if err != nil {
			errorResponse(w, err)
			return
		}

		_, err = file.Write(buf)
		if err != nil {
			errorResponse(w, err)
			return
		}

		err = file.Close()
		if err != nil {
			errorResponse(w, err)
			return
		}

		fmt.Printf("200 %s\n", time.Now())
		fmt.Fprintf(w, filepath)
	})

	fmt.Println("server start on localhost:8080")
	http.ListenAndServe(":8080", mux)

}

images ディレクトリ無いとエラー出ますのでよろしくお願いします．