anonymize_filename.ex
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anonymize_filename.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Upload.Filter.AnonymizeFilename do
	@moduledoc """
	Replaces the original filename with a pre-defined text or randomly generated string.

	Should be used after `Pleroma.Upload.Filter.Dedupe`.
	"""
	@behaviour Pleroma.Upload.Filter

	@config_impl Application.compile_env(:pleroma, [__MODULE__, :config_impl], Pleroma.Config)
	alias Pleroma.Upload

	def filter(%Upload{name: name} = upload) do
	extension = List.last(String.split(name, "."))
	name = predefined_name(extension) \|\| random(extension)
	{:ok, :filtered, %Upload{upload \| name: name}}
	end

	def filter(_), do: {:ok, :noop}

	@spec predefined_name(String.t()) :: String.t() \| nil
	defp predefined_name(extension) do
	with name when not is_nil(name) <- @config_impl.get([__MODULE__, :text]),
	do: String.replace(name, "{extension}", extension)
	end

	defp random(extension) do
	string =
	10
	\|> :crypto.strong_rand_bytes()
	\|> Base.url_encode64(padding: false)

	string <> "." <> extension
	end
	end