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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.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
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