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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Upload.Filter.Exiftool do
@moduledoc """
Strips GPS related EXIF tags and overwrites the file in place.
Also strips or replaces filesystem metadata e.g., timestamps.
"""
@behaviour Pleroma.Upload.Filter
@spec filter(Pleroma.Upload.t()) :: {:ok, any()} | {:error, String.t()}
# Formats not compatible with exiftool at this time
def filter(%Pleroma.Upload{content_type: "image/heic"}), do: {:ok, :noop}
def filter(%Pleroma.Upload{content_type: "image/webp"}), do: {:ok, :noop}
def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
try do
case System.cmd("exiftool", ["-overwrite_original", "-gps:all=", file], parallelism: true) do
{_response, 0} -> {:ok, :filtered}
{error, 1} -> {:error, error}
end
rescue
e in ErlangError ->
{:error, "#{__MODULE__}: #{inspect(e)}"}
end
end
def filter(_), do: {:ok, :noop}
end
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