41 lines
1.2 KiB
Elixir
41 lines
1.2 KiB
Elixir
# Portions of this file are derived from Pleroma:
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/upload/filter/anonymize_filename.ex
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defmodule Mobilizon.Web.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 `Mobilizon.Web.Upload.Filter.Dedupe`.
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"""
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@behaviour Mobilizon.Web.Upload.Filter
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alias Mobilizon.Config
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alias Mobilizon.Web.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, :filtered, %Upload{upload | name: name}}
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end
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def filter(_), do: {:ok, :noop}
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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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