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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Upload.Filter.Mogrifun do
   6   @behaviour Pleroma.Upload.Filter
   7   alias Pleroma.Upload.Filter
   8
   9   @moduledoc """
  10   This module is just an example of an Upload filter. It's not supposed to be used in production.
  11   """
  12
  13   @filters [
  14     {"implode", "1"},
  15     {"-raise", "20"},
  16     {"+raise", "20"},
  17     [{"-interpolate", "nearest"}, {"-virtual-pixel", "mirror"}, {"-spread", "5"}],
  18     "+polaroid",
  19     {"-statistic", "Mode 10"},
  20     {"-emboss", "0x1.1"},
  21     {"-emboss", "0x2"},
  22     {"-colorspace", "Gray"},
  23     "-negate",
  24     [{"-channel", "green"}, "-negate"],
  25     [{"-channel", "red"}, "-negate"],
  26     [{"-channel", "blue"}, "-negate"],
  27     {"+level-colors", "green,gold"},
  28     {"+level-colors", ",DodgerBlue"},
  29     {"+level-colors", ",Gold"},
  30     {"+level-colors", ",Lime"},
  31     {"+level-colors", ",Red"},
  32     {"+level-colors", ",DarkGreen"},
  33     {"+level-colors", "firebrick,yellow"},
  34     {"+level-colors", "'rgb(102,75,25)',lemonchiffon"},
  35     [{"fill", "red"}, {"tint", "40"}],
  36     [{"fill", "green"}, {"tint", "40"}],
  37     [{"fill", "blue"}, {"tint", "40"}],
  38     [{"fill", "yellow"}, {"tint", "40"}]
  39   ]
  40
  41   @spec filter(Pleroma.Upload.t()) :: {:ok, atom()} | {:error, String.t()}
  42   def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
  43     try do
  44       Filter.Mogrify.do_filter(file, [Enum.random(@filters)])
  45       {:ok, :filtered}
  46     rescue
  47       e in ErlangError ->
  48         {:error, "#{__MODULE__}: #{inspect(e)}"}
  49     end
  50   end
  51
  52   def filter(_), do: {:ok, :noop}
  53 end