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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.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
alias 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, %Upload{upload | name: name}}
end
@spec predefined_name(String.t()) :: String.t() | nil
defp predefined_name(extension) do
with name when not is_nil(name) <- Config.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
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