pleroma

uploaded_media.ex (2984B)

# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Plugs.UploadedMedia do
  @moduledoc """
  """
  import Plug.Conn
  import Pleroma.Web.Gettext
  require Logger
  alias Pleroma.Web.MediaProxy
  @behaviour Plug
  # no slashes
  @path "media"
  @default_cache_control_header "public, max-age=1209600"
  def init(_opts) do
    static_plug_opts =
      [
        headers: %{"cache-control" => @default_cache_control_header},
        cache_control_for_etags: @default_cache_control_header
      ]
      |> Keyword.put(:from, "__unconfigured_media_plug")
      |> Keyword.put(:at, "/__unconfigured_media_plug")
      |> Plug.Static.init()
    %{static_plug_opts: static_plug_opts}
  end
  def call(%{request_path: <<"/", @path, "/", file::binary>>} = conn, opts) do
    conn =
      case fetch_query_params(conn) do
        %{query_params: %{"name" => name}} = conn ->
          name = String.replace(name, ~s["], ~s[\\"])
          put_resp_header(conn, "content-disposition", ~s[inline; filename="#{name}"])
        conn ->
          conn
      end
      |> merge_resp_headers([{"content-security-policy", "sandbox"}])
    config = Pleroma.Config.get(Pleroma.Upload)
    with uploader <- Keyword.fetch!(config, :uploader),
         proxy_remote = Keyword.get(config, :proxy_remote, false),
         {:ok, get_method} <- uploader.get_file(file),
         false <- media_is_banned(conn, get_method) do
      get_media(conn, get_method, proxy_remote, opts)
    else
      _ ->
        conn
        |> send_resp(:internal_server_error, dgettext("errors", "Failed"))
        |> halt()
    end
  end
  def call(conn, _opts), do: conn
  defp media_is_banned(%{request_path: path} = _conn, {:static_dir, _}) do
    MediaProxy.in_banned_urls(Pleroma.Upload.base_url() <> path)
  end
  defp media_is_banned(_, {:url, url}), do: MediaProxy.in_banned_urls(url)
  defp media_is_banned(_, _), do: false
  defp get_media(conn, {:static_dir, directory}, _, opts) do
    static_opts =
      Map.get(opts, :static_plug_opts)
      |> Map.put(:at, [@path])
      |> Map.put(:from, directory)
    conn = Plug.Static.call(conn, static_opts)
    if conn.halted do
      conn
    else
      conn
      |> send_resp(:not_found, dgettext("errors", "Not found"))
      |> halt()
    end
  end
  defp get_media(conn, {:url, url}, true, _) do
    proxy_opts = [
      http: [
        follow_redirect: true,
        pool: :upload
      ]
    ]
    conn
    |> Pleroma.ReverseProxy.call(url, proxy_opts)
  end
  defp get_media(conn, {:url, url}, _, _) do
    conn
    |> Phoenix.Controller.redirect(external: url)
    |> halt()
  end
  defp get_media(conn, unknown, _, _) do
    Logger.error("#{__MODULE__}: Unknown get strategy: #{inspect(unknown)}")
    conn
    |> send_resp(:internal_server_error, dgettext("errors", "Internal Error"))
    |> halt()
  end
end