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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Plugs.UploadedMedia do
   6   @moduledoc """
   7   """
   8
   9   import Plug.Conn
  10   require Logger
  11
  12   @behaviour Plug
  13   # no slashes
  14   @path "media"
  15
  16   def init(_opts) do
  17     static_plug_opts =
  18       []
  19       |> Keyword.put(:from, "__unconfigured_media_plug")
  20       |> Keyword.put(:at, "/__unconfigured_media_plug")
  21       |> Plug.Static.init()
  22
  23     %{static_plug_opts: static_plug_opts}
  24   end
  25
  26   def call(%{request_path: <<"/", @path, "/", file::binary>>} = conn, opts) do
  27     config = Pleroma.Config.get([Pleroma.Upload])
  28
  29     with uploader <- Keyword.fetch!(config, :uploader),
  30          proxy_remote = Keyword.get(config, :proxy_remote, false),
  31          {:ok, get_method} <- uploader.get_file(file) do
  32       get_media(conn, get_method, proxy_remote, opts)
  33     else
  34       _ ->
  35         conn
  36         |> send_resp(500, "Failed")
  37         |> halt()
  38     end
  39   end
  40
  41   def call(conn, _opts), do: conn
  42
  43   defp get_media(conn, {:static_dir, directory}, _, opts) do
  44     static_opts =
  45       Map.get(opts, :static_plug_opts)
  46       |> Map.put(:at, [@path])
  47       |> Map.put(:from, directory)
  48
  49     conn = Plug.Static.call(conn, static_opts)
  50
  51     if conn.halted do
  52       conn
  53     else
  54       conn
  55       |> send_resp(404, "Not found")
  56       |> halt()
  57     end
  58   end
  59
  60   defp get_media(conn, {:url, url}, true, _) do
  61     conn
  62     |> Pleroma.ReverseProxy.call(url, Pleroma.Config.get([Pleroma.Upload, :proxy_opts], []))
  63   end
  64
  65   defp get_media(conn, {:url, url}, _, _) do
  66     conn
  67     |> Phoenix.Controller.redirect(external: url)
  68     |> halt()
  69   end
  70
  71   defp get_media(conn, unknown, _, _) do
  72     Logger.error("#{__MODULE__}: Unknown get startegy: #{inspect(unknown)}")
  73
  74     conn
  75     |> send_resp(500, "Internal Error")
  76     |> halt()
  77   end
  78 end