1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Upload.Filter.AnonymizeFilename do
7 Replaces the original filename with a pre-defined text or randomly generated string.
9 Should be used after `Pleroma.Upload.Filter.Dedupe`.
11 @behaviour Pleroma.Upload.Filter
16 def filter(%Upload{name: name} = upload) do
17 extension = List.last(String.split(name, "."))
18 name = predefined_name(extension) || random(extension)
19 {:ok, %Upload{upload | name: name}}
22 @spec predefined_name(String.t()) :: String.t() | nil
23 defp predefined_name(extension) do
24 with name when not is_nil(name) <- Config.get([__MODULE__, :text]),
25 do: String.replace(name, "{extension}", extension)
28 defp random(extension) do
31 |> :crypto.strong_rand_bytes()
32 |> Base.url_encode64(padding: false)
34 string <> "." <> extension