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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Upload.Filter.AnonymizeFilename do
   6   @moduledoc """
   7   Replaces the original filename with a pre-defined text or randomly generated string.
   8
   9   Should be used after `Pleroma.Upload.Filter.Dedupe`.
  10   """
  11   @behaviour Pleroma.Upload.Filter
  12
  13   def filter(upload) do
  14     extension = List.last(String.split(upload.name, "."))
  15     name = Pleroma.Config.get([__MODULE__, :text], random(extension))
  16     {:ok, %Pleroma.Upload{upload | name: name}}
  17   end
  18
  19   defp random(extension) do
  20     string =
  21       10
  22       |> :crypto.strong_rand_bytes()
  23       |> Base.url_encode64(padding: false)
  24
  25     string <> "." <> extension
  26   end
  27 end