Upload manager for local storage - /lib/myapp/upload_manager/local.ex

upload_manager_local.ex

defmodule App.UploadManager.Local do

  @behaviour App.UploadManager.Behavior
  @config Application.get_env(:app, :file_manager)[:local]

  @doc """
  Check if file exists
  """
  def exists?(destination) do
    destination = build_path(destination)
    File.exists?(destination)
  end

  def save_from_file!(source, destination, _opts \\ %{})  do
    destination = build_path(destination)
    dirname = Path.dirname(destination)
    case File.mkdir_p(dirname) do
      :ok ->
        File.copy!(source, destination)
        :ok
      {:error, reason} -> {:error, reason}
    end
  end

  @doc """
  Save file to disk
  """
  def save_from_content!(source, destination, _opts \\ %{})  do
    destination = build_path(destination)
    dirname = Path.dirname(destination)
    case File.mkdir_p(dirname) do
      :ok ->
        File.write!(destination, source)
        :ok
      {:error, reason} -> {:error, reason}
    end
  end


  @doc """
  Delete file from disk
  """
  def delete!(destination) do
    destination = build_path(destination)
    File.rm(destination)
  end

  @doc """
    Save already existed in media storage file to local file
  """
  def save_to_local_file!(source, destination) do
    source = build_path(source)

    File.copy(source, destination)
  end

  @doc """
  return URL for file
  """
  def url(key) do
    base_url = @config[:base_url]
    "#{base_url}/#{key}"
  end

  # build full file path including base path from config
  defp build_path(path) do
    @config[:base_path] <> "/" <> path
  end

end