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fluminus

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A library for the reverse-engineered LumiNUS API (https://luminus.nus.edu.sg)

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fluminus lib fluminus api module external_multimedia child.ex
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lib/fluminus/api/module/external_multimedia/child.ex 

defmodule Fluminus.API.Module.ExternalMultimedia.Child do

  @moduledoc """

  Provides an abstraction over an external multimedia channel's child.

  """



  defstruct ~w(name viewer_url client)a



  alias Fluminus.HTTPClient

  alias Fluminus.Util



  @type t :: %__MODULE__{name: String.t(), viewer_url: String.t(), client: HTTPClient.t()}



  @spec from_api(any(), HTTPClient.t()) :: __MODULE__.t()

  def from_api(%{"ViewerUrl" => viewer_url, "SessionName" => name}, client) do

    %__MODULE__{viewer_url: viewer_url, name: name, client: client}

  end



  @spec get_download_url(__MODULE__.t()) :: {:ok, String.t()} | {:error, any()}

  def get_download_url(%__MODULE__{viewer_url: viewer_url, client: client}) do

    with {:ok, client, _, %{status_code: 200, body: body}} <- HTTPClient.get(client, viewer_url),

         [{_, [_, {"content", video_url}], _}] <- Floki.find(body, "meta[property=\"og:video\"]"),

         {:ok, _, %{"location" => location}, %{status_code: 302}} <- HTTPClient.get(client, video_url) do

      {:ok, location}

    else

      {:error, error} -> {:error, error}

      x -> {:error, x}

    end

  end



  @spec download(__MODULE__.t(), String.t(), bool()) :: :ok | {:error, :exists | any()}

  def download(child = %__MODULE__{name: name}, path, verbose) do

    destination = Path.join(path, Util.sanitise_filename(name) <> ".mp4")

    f = fn -> get_download_url(child) end



    Util.download(f, destination, verbose)

  end

end