JumboPetstore/util/downloadFile.go

package util

import (
	"io"
	"io/ioutil"
	"net/http"
	"os"
	"path/filepath"
	"strings"
)

func WriteFile(fileName string, fileBytes []byte) (string, error) {
	var (
		nameSplit []string
		tempFile  *os.File
		err       error
	)

	// Used to get the file extension
	// This could be improved with a mime-type lookup
	nameSplit = strings.Split(fileName, ".")

	tempFile, err = ioutil.TempFile("./uploads", "upload-*."+nameSplit[len(nameSplit)-1])
	if err != nil {
		return "", err
	}
	defer tempFile.Close()

	_, err = tempFile.Write(fileBytes)

	return filepath.Base(tempFile.Name()), err
}

func DownloadFile(url string) (string, error) {
	var (
		resp      *http.Response
		fileBytes []byte
		err       error
	)

	resp, err = http.Get(url)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	fileBytes, err = io.ReadAll(resp.Body)

	return WriteFile(url, fileBytes)
}