mirror of https://akkoma.dev/AkkomaGang/akkoma.git
52 lines
1.7 KiB
Elixir
52 lines
1.7 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.Exiftool.StripMetadata do
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@moduledoc """
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Tries to strip all image metadata but colorspace and orientation overwriting the file in place.
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Also strips or replaces filesystem metadata e.g., timestamps.
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"""
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@behaviour Pleroma.Upload.Filter
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alias Pleroma.Config
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@purge_default ["all", "CommonIFD0"]
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@preserve_default ["ColorSpaceTags", "Orientation"]
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@spec filter(Pleroma.Upload.t()) :: {:ok, :noop} | {:ok, :filtered} | {:error, String.t()}
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# Formats not compatible with exiftool at this time
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def filter(%Pleroma.Upload{content_type: "image/webp"}), do: {:ok, :noop}
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def filter(%Pleroma.Upload{content_type: "image/svg+xml"}), do: {:ok, :noop}
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def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
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purge_args =
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Config.get([__MODULE__, :purge], @purge_default)
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|> Enum.map(fn mgroup -> "-" <> mgroup <> "=" end)
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preserve_args =
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Config.get([__MODULE__, :preserve], @preserve_default)
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|> Enum.map(fn mgroup -> "-" <> mgroup end)
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|> then(fn
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# If -TagsFromFile is not followed by tag selectors, it will copy most available tags
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[] -> []
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args -> ["-TagsFromFile", "@" | args]
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end)
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args = ["-ignoreMinorErrors", "-overwrite_original" | purge_args] ++ preserve_args ++ [file]
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try do
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case System.cmd("exiftool", args, parallelism: true) do
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{_response, 0} -> {:ok, :filtered}
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{error, 1} -> {:error, error}
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end
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rescue
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e in ErlangError ->
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{:error, "#{__MODULE__}: #{inspect(e)}"}
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end
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end
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def filter(_), do: {:ok, :noop}
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end
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