37 lines
1.0 KiB
Elixir
37 lines
1.0 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Upload.Filter.AnonymizeFilename do
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@moduledoc """
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Replaces the original filename with a pre-defined text or randomly generated string.
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Should be used after `Pleroma.Upload.Filter.Dedupe`.
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"""
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@behaviour Pleroma.Upload.Filter
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alias Pleroma.Config
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alias Pleroma.Upload
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def filter(%Upload{name: name} = upload) do
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extension = List.last(String.split(name, "."))
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name = predefined_name(extension) || random(extension)
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{:ok, %Upload{upload | name: name}}
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end
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@spec predefined_name(String.t()) :: String.t() | nil
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defp predefined_name(extension) do
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with name when not is_nil(name) <- Config.get([__MODULE__, :text]),
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do: String.replace(name, "{extension}", extension)
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end
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defp random(extension) do
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string =
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10
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|> :crypto.strong_rand_bytes()
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|> Base.url_encode64(padding: false)
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string <> "." <> extension
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end
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end
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