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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 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
   8   @filters [
   9     {"implode", "1"},
  10     {"-raise", "20"},
  11     {"+raise", "20"},
  12     [{"-interpolate", "nearest"}, {"-virtual-pixel", "mirror"}, {"-spread", "5"}],
  13     "+polaroid",
  14     {"-statistic", "Mode 10"},
  15     {"-emboss", "0x1.1"},
  16     {"-emboss", "0x2"},
  17     {"-colorspace", "Gray"},
  18     "-negate",
  19     [{"-channel", "green"}, "-negate"],
  20     [{"-channel", "red"}, "-negate"],
  21     [{"-channel", "blue"}, "-negate"],
  22     {"+level-colors", "green,gold"},
  23     {"+level-colors", ",DodgerBlue"},
  24     {"+level-colors", ",Gold"},
  25     {"+level-colors", ",Lime"},
  26     {"+level-colors", ",Red"},
  27     {"+level-colors", ",DarkGreen"},
  28     {"+level-colors", "firebrick,yellow"},
  29     {"+level-colors", "'rgb(102,75,25)',lemonchiffon"},
  30     [{"fill", "red"}, {"tint", "40"}],
  31     [{"fill", "green"}, {"tint", "40"}],
  32     [{"fill", "blue"}, {"tint", "40"}],
  33     [{"fill", "yellow"}, {"tint", "40"}]
  34   ]
  35
  36   def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
  37     filter = Enum.random(@filters)
  38
  39     file
  40     |> Mogrify.open()
  41     |> mogrify_filter(filter)
  42     |> Mogrify.save(in_place: true)
  43
  44     :ok
  45   end
  46
  47   def filter(_), do: :ok
  48
  49   defp mogrify_filter(mogrify, [filter | rest]) do
  50     mogrify
  51     |> mogrify_filter(filter)
  52     |> mogrify_filter(rest)
  53   end
  54
  55   defp mogrify_filter(mogrify, []), do: mogrify
  56
  57   defp mogrify_filter(mogrify, {action, options}) do
  58     Mogrify.custom(mogrify, action, options)
  59   end
  60
  61   defp mogrify_filter(mogrify, string) when is_binary(string) do
  62     Mogrify.custom(mogrify, string)
  63   end
  64 end