Upload Handler for petstore Go chronicles

uploadimage.go

var imageDir string = "images"

func UploadPetImage(c echo.Context) error {
	// Get id from Multipart form data
	id, err := strconv.Atoi(c.FormValue("id"))
  // get file form form data
	file, err := c.FormFile("file")
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "Couldn't read file from form value")
	}
	// Read Source file
	src, err := file.Open()
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, "Couldn't open file")
	}
	defer src.Close()
	// Create Destination
	dstPath := filepath.Join(imageDir, file.Filename)
	dst, err := os.Create(dstPath)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, "Couldn't create destination file")
	}
	defer dst.Close()

	// Copy source to destination
	if _, err = io.Copy(dst, src); err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, "Couldn't copy file")
	}
  // Update database
	err = service.UpdateImageURL(&db.Pet{ID: id, ImageURL: dstPath})
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, "Couldn't read file")
	}
	return c.JSON(http.StatusCreated, "File uploaded successfully")
}