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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.Plugs.FrontendStatic do
   6   require Pleroma.Constants
   7
   8   @moduledoc """
   9   This is a shim to call `Plug.Static` but with runtime `from` configuration`. It dispatches to the different frontends.
  10   """
  11   @behaviour Plug
  12
  13   def file_path(path, frontend_type \\ :primary) do
  14     if configuration = Pleroma.Config.get([:frontends, frontend_type]) do
  15       instance_static_path = Pleroma.Config.get([:instance, :static_dir], "instance/static")
  16
  17       Path.join([
  18         instance_static_path,
  19         "frontends",
  20         configuration["name"],
  21         configuration["ref"],
  22         path
  23       ])
  24     else
  25       nil
  26     end
  27   end
  28
  29   def init(opts) do
  30     opts
  31     |> Keyword.put(:from, "__unconfigured_frontend_static_plug")
  32     |> Plug.Static.init()
  33     |> Map.put(:frontend_type, opts[:frontend_type])
  34   end
  35
  36   def call(conn, opts) do
  37     with false <- api_route?(conn.path_info),
  38          false <- invalid_path?(conn.path_info),
  39          frontend_type <- Map.get(opts, :frontend_type, :primary),
  40          path when not is_nil(path) <- file_path("", frontend_type) do
  41       call_static(conn, opts, path)
  42     else
  43       _ ->
  44         conn
  45     end
  46   end
  47
  48   defp invalid_path?(list) do
  49     invalid_path?(list, :binary.compile_pattern(["/", "\\", ":", "\0"]))
  50   end
  51
  52   defp invalid_path?([h | _], _match) when h in [".", "..", ""], do: true
  53   defp invalid_path?([h | t], match), do: String.contains?(h, match) or invalid_path?(t)
  54   defp invalid_path?([], _match), do: false
  55
  56   defp api_route?([]), do: false
  57
  58   defp api_route?([h | t]) do
  59     api_routes = Pleroma.Web.Router.get_api_routes()
  60     if h in api_routes, do: true, else: api_route?(t)
  61   end
  62
  63   defp call_static(conn, opts, from) do
  64     opts = Map.put(opts, :from, from)
  65     Plug.Static.call(conn, opts)
  66   end
  67 end