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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.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   # Formats not compatible with exiftool at this time
  15   def filter(%Pleroma.Upload{content_type: "image/heic"}), do: {:ok, :noop}
  16   def filter(%Pleroma.Upload{content_type: "image/webp"}), do: {:ok, :noop}
  17
  18   def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
  19     try do
  20       case System.cmd("exiftool", ["-overwrite_original", "-gps:all=", file], parallelism: true) do
  21         {_response, 0} -> {:ok, :filtered}
  22         {error, 1} -> {:error, error}
  23       end
  24     rescue
  25       e in ErlangError ->
  26         {:error, "#{__MODULE__}: #{inspect(e)}"}
  27     end
  28   end
  29
  30   def filter(_), do: {:ok, :noop}
  31 end