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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 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, "\"", "\\\"")
+
+ put_resp_header(conn, "content-disposition", "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.Web.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
+ conn
+ |> Pleroma.ReverseProxy.call(url, Pleroma.Config.get([Pleroma.Upload, :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 startegy: #{inspect(unknown)}")
+
+ conn
+ |> send_resp(:internal_server_error, dgettext("errors", "Internal Error"))
+ |> halt()
+ end
+end