Signing Web Service

README.md

How to use

You can use it from command line with curl like this

c:> curl -sSL -F [email protected] http://localhost:4500/sign -o project1_signed.exe --fail || echo failed

main.go

package main

import (
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"
	"time"
)

func uploadHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != "POST" {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// limit upload up to 1024 MB
	if err := r.ParseMultipartForm(1024 << 20); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	exFile, err := os.Executable()
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	exPath := filepath.Dir(exFile)

	files := r.MultipartForm.File["file"]

	for _, fileHeader := range files {
		file, err := fileHeader.Open()
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		err = os.MkdirAll(filepath.Join(exPath, "uploads"), os.ModePerm)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		uploadFile := filepath.Base(fileHeader.Filename)
		uploadPath := filepath.Join(exPath, "uploads", fmt.Sprintf("%d-%s", time.Now().UnixNano(), uploadFile))

		f, err := os.Create(uploadPath)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		defer f.Close()

		_, err = io.Copy(f, file)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		f.Close()

		batFile, err := filepath.Abs(filepath.Join(exPath, "s.bat"))
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		out, err := exec.Command("cmd.exe", "/c", batFile, uploadPath).Output()
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		outstr := string(out)
		if !strings.Contains(outstr, "Succeed") {
			http.Error(w, outstr, http.StatusInternalServerError)
			return
		}

		w.Header().Set("Content-Disposition", "attachment; filename="+strconv.Quote(uploadFile))
		w.Header().Set("Content-Type", "application/octet-stream")
		http.ServeFile(w, r, uploadPath)

		os.Remove(uploadPath)
	}
}

func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/sign", uploadHandler)

	if err := http.ListenAndServe(":4500", mux); err != nil {
		log.Fatal(err)
	}
}