func UploadHandler()

in GoBlog/main.go [73:118]
37 lines of code
6 McCabe index (conditional complexity)

func UploadHandler(w http.ResponseWriter, r *http.Request) {
	const MAX_UPLOAD_SIZE = 10 << 20
	r.Body = http.MaxBytesReader(w, r.Body, MAX_UPLOAD_SIZE)
	if err := r.ParseMultipartForm(MAX_UPLOAD_SIZE); err != nil {
		http.Error(w, "The uploaded file is too big. Please choose an file that's less than 10MB in size", http.StatusBadRequest)
		return
	}

	file, fileHeader, err := r.FormFile("file")
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	defer file.Close()

	// Create the uploads folder if it doesn't already exist
	err = os.MkdirAll("./images", os.ModePerm)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	// Create a new file in the uploads directory
	filename := fmt.Sprintf("/images/%d%s", time.Now().UnixNano(), filepath.Ext(fileHeader.Filename))
	dst, err := os.Create("." + filename)
	if err != nil {
		fmt.Println(err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	defer dst.Close()

	// Copy the uploaded file to  the specified destination
	_, err = io.Copy(dst, file)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	fmt.Println(filename)
	response, _ := json.Marshal(map[string]string{"location": filename})
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	w.Write(response)
}