strip_location.ex
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strip_location.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Upload.Filter.Exiftool.StripLocation 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

	# 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{content_type: "image/svg" <> _}), do: {:ok, :noop}

	def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
	try do
	case System.cmd("exiftool", ["-overwrite_original", "-gps:all=", "-png: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