package utilFile

import (
	"io"
	"mime/multipart"
	"net/http"
	"os"
)

// DownloadFile 会将url下载到本地文件，它会在下载时写入，而不是将整个文件加载到内存中。
func DownloadFile(url, filepath string) error {
	// Get the data
	resp, err := http.Get(url)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	// Create the file
	out, err := os.Create(filepath)
	if err != nil {
		return err
	}
	defer out.Close()
	// Write the body to file
	_, err = io.Copy(out, resp.Body)
	return err
}

func SaveUploadedFile(file *multipart.FileHeader, dst string) error {
	src, err := file.Open()
	if err != nil {
		return err
	}
	defer src.Close()

	out, err := os.Create(dst)
	if err != nil {
		return err
	}
	defer out.Close()

	_, err = io.Copy(out, src)
	return err
}