84 lines
2.1 KiB
Elixir
84 lines
2.1 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Upload.Filter.AnalyzeMetadata do
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@moduledoc """
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Extracts metadata about the upload, such as width/height
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"""
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require Logger
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@behaviour Pleroma.Upload.Filter
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@spec filter(Pleroma.Upload.t()) ::
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{:ok, :filtered, Pleroma.Upload.t()} | {:ok, :noop} | {:error, String.t()}
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def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _} = upload) do
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try do
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image =
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file
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|> Mogrify.open()
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|> Mogrify.verbose()
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upload =
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upload
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|> Map.put(:width, image.width)
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|> Map.put(:height, image.height)
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|> Map.put(:blurhash, get_blurhash(file))
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{:ok, :filtered, upload}
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rescue
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e in ErlangError ->
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Logger.warn("#{__MODULE__}: #{inspect(e)}")
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{:ok, :noop}
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end
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end
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def filter(%Pleroma.Upload{tempfile: file, content_type: "video" <> _} = upload) do
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try do
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result = media_dimensions(file)
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upload =
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upload
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|> Map.put(:width, result.width)
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|> Map.put(:height, result.height)
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{:ok, :filtered, upload}
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rescue
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e in ErlangError ->
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Logger.warn("#{__MODULE__}: #{inspect(e)}")
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{:ok, :noop}
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end
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end
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def filter(_), do: {:ok, :noop}
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defp get_blurhash(file) do
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with {:ok, blurhash} <- :eblurhash.magick(file) do
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blurhash
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else
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_ -> nil
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end
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end
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defp media_dimensions(file) do
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with executable when is_binary(executable) <- System.find_executable("ffprobe"),
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args = [
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"-v",
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"error",
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"-show_entries",
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"stream=width,height",
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"-of",
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"csv=p=0:s=x",
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file
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],
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{result, 0} <- System.cmd(executable, args),
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[width, height] <-
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String.split(String.trim(result), "x") |> Enum.map(&String.to_integer(&1)) do
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%{width: width, height: height}
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else
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nil -> {:error, {:ffprobe, :command_not_found}}
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{:error, _} = error -> error
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end
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end
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end
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