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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.AnalyzeMetadata do
@moduledoc """
Extracts metadata about the upload, such as width/height
"""
require Logger
@behaviour Pleroma.Upload.Filter
@spec filter(Pleroma.Upload.t()) ::
{:ok, :filtered, Pleroma.Upload.t()} | {:ok, :noop} | {:error, String.t()}
def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _} = upload) do
try do
image =
file
|> Mogrify.open()
|> Mogrify.verbose()
upload =
upload
|> Map.put(:width, image.width)
|> Map.put(:height, image.height)
|> Map.put(:blurhash, get_blurhash(file))
{:ok, :filtered, upload}
rescue
e in ErlangError ->
Logger.warn("#{__MODULE__}: #{inspect(e)}")
{:ok, :noop}
end
end
def filter(_), do: {:ok, :noop}
defp get_blurhash(file) do
with {:ok, blurhash} <- :eblurhash.magick(file) do
blurhash
else
_ -> nil
end
end
end
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