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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.Exiftool do
   6   @moduledoc """
   7   Strips GPS related EXIF tags and overwrites the file in place.
   8   Also strips or replaces filesystem metadata e.g., timestamps.
   9   """
  10   @behaviour Pleroma.Upload.Filter
  11
  12   @spec filter(Pleroma.Upload.t()) :: {:ok, any()} | {:error, String.t()}
  13
  14   # webp is not compatible with exiftool at this time
  15   def filter(%Pleroma.Upload{content_type: "image/webp"}), do: {:ok, :noop}
  16
  17   def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
  18     try do
  19       case System.cmd("exiftool", ["-overwrite_original", "-gps:all=", file], parallelism: true) do
  20         {_response, 0} -> {:ok, :filtered}
  21         {error, 1} -> {:error, error}
  22       end
  23     rescue
  24       _e in ErlangError ->
  25         {:error, "exiftool command not found"}
  26     end
  27   end
  28
  29   def filter(_), do: {:ok, :noop}
  30 end