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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Upload.Filter.Mogrify do
   6   @behaviour Pleroma.Upload.Filter
   7
   8   @type conversion :: action :: String.t() | {action :: String.t(), opts :: String.t()}
   9   @type conversions :: conversion() | [conversion()]
  10
  11   def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
  12     filters = Pleroma.Config.get!([__MODULE__, :args])
  13
  14     do_filter(file, filters)
  15     :ok
  16   end
  17
  18   def filter(_), do: :ok
  19
  20   def do_filter(file, filters) do
  21     file
  22     |> Mogrify.open()
  23     |> mogrify_filter(filters)
  24     |> Mogrify.save(in_place: true)
  25   end
  26
  27   defp mogrify_filter(mogrify, nil), do: mogrify
  28
  29   defp mogrify_filter(mogrify, [filter | rest]) do
  30     mogrify
  31     |> mogrify_filter(filter)
  32     |> mogrify_filter(rest)
  33   end
  34
  35   defp mogrify_filter(mogrify, []), do: mogrify
  36
  37   defp mogrify_filter(mogrify, {action, options}) do
  38     Mogrify.custom(mogrify, action, options)
  39   end
  40
  41   defp mogrify_filter(mogrify, action) when is_binary(action) do
  42     Mogrify.custom(mogrify, action)
  43   end
  44 end