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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.Mogrifun do
   6   @behaviour Pleroma.Upload.Filter
   7   alias Pleroma.Upload.Filter
   8
   9   @filters [
  10     {"implode", "1"},
  11     {"-raise", "20"},
  12     {"+raise", "20"},
  13     [{"-interpolate", "nearest"}, {"-virtual-pixel", "mirror"}, {"-spread", "5"}],
  14     "+polaroid",
  15     {"-statistic", "Mode 10"},
  16     {"-emboss", "0x1.1"},
  17     {"-emboss", "0x2"},
  18     {"-colorspace", "Gray"},
  19     "-negate",
  20     [{"-channel", "green"}, "-negate"],
  21     [{"-channel", "red"}, "-negate"],
  22     [{"-channel", "blue"}, "-negate"],
  23     {"+level-colors", "green,gold"},
  24     {"+level-colors", ",DodgerBlue"},
  25     {"+level-colors", ",Gold"},
  26     {"+level-colors", ",Lime"},
  27     {"+level-colors", ",Red"},
  28     {"+level-colors", ",DarkGreen"},
  29     {"+level-colors", "firebrick,yellow"},
  30     {"+level-colors", "'rgb(102,75,25)',lemonchiffon"},
  31     [{"fill", "red"}, {"tint", "40"}],
  32     [{"fill", "green"}, {"tint", "40"}],
  33     [{"fill", "blue"}, {"tint", "40"}],
  34     [{"fill", "yellow"}, {"tint", "40"}]
  35   ]
  36
  37   @spec filter(Pleroma.Upload.t()) :: :ok | {:error, String.t()}
  38   def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
  39     try do
  40       Filter.Mogrify.do_filter(file, [Enum.random(@filters)])
  41       :ok
  42     rescue
  43       _e in ErlangError ->
  44         {:error, "mogrify command not found"}
  45     end
  46   end
  47
  48   def filter(_), do: :ok
  49 end