cd316d7269
During attachment upload Pleroma returns a "description" field. Pleroma-fe has an MR to use that to pre-fill the image description field, <https://git.pleroma.social/pleroma/pleroma-fe/-/merge_requests/1399> * This MR allows Pleroma to read the EXIF data during upload and return the description to the FE * If a description is already present (e.g. because a previous module added it), it will use that * Otherwise it will read from the EXIF data. First it will check -ImageDescription, if that's empty, it will check -iptc:Caption-Abstract * If no description is found, it will simply return nil, just like before * When people set up a new instance, they will be asked if they want to read metadata and this module will be activated if so This was taken from an MR i did on Pleroma and isn't finished yet.
48 lines
1.6 KiB
Elixir
48 lines
1.6 KiB
Elixir
# 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.ExiftoolReadData do
|
|
@moduledoc """
|
|
Gets the description from the related EXIF tags and provides them in the response if no description is provided yet.
|
|
It will first check ImageDescription, when that's too long or empty, it will check iptc:Caption-Abstract.
|
|
When the description is too long (see `:instance, :description_limit`), an empty string is returned.
|
|
"""
|
|
@behaviour Pleroma.Upload.Filter
|
|
|
|
@spec filter(Pleroma.Upload.t()) :: {:ok, any()} | {:error, String.t()}
|
|
|
|
def filter(%Pleroma.Upload{description: description})
|
|
when is_binary(description),
|
|
do: {:ok, :noop}
|
|
|
|
def filter(%Pleroma.Upload{tempfile: file} = upload),
|
|
do: {:ok, :filtered, upload |> Map.put(:description, read_description_from_exif_data(file))}
|
|
|
|
def filter(_, _), do: {:ok, :noop}
|
|
|
|
defp read_description_from_exif_data(file) do
|
|
nil
|
|
|> read_when_empty(file, "-ImageDescription")
|
|
|> read_when_empty(file, "-iptc:Caption-Abstract")
|
|
end
|
|
|
|
defp read_when_empty(current_description, _, _) when is_binary(current_description),
|
|
do: current_description
|
|
|
|
defp read_when_empty(_, file, tag) do
|
|
try do
|
|
{tag_content, 0} =
|
|
System.cmd("exiftool", ["-b", "-s3", tag, file], stderr_to_stdout: true, parallelism: true)
|
|
|
|
if tag_content != "" and
|
|
String.length(tag_content) <=
|
|
Pleroma.Config.get([:instance, :description_limit]),
|
|
do: tag_content,
|
|
else: nil
|
|
rescue
|
|
_ in ErlangError -> nil
|
|
end
|
|
end
|
|
end
|