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diff --git a/lib/pleroma/upload/filter/exiftool/read_description.ex b/lib/pleroma/upload/filter/exiftool/read_description.ex
index 03d698a81..543b22031 100644
--- a/lib/pleroma/upload/filter/exiftool/read_description.ex
+++ b/lib/pleroma/upload/filter/exiftool/read_description.ex
@@ -1,49 +1,52 @@
# 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.Exiftool.ReadDescription do
@moduledoc """
Gets a valid 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 doesn't probide a valid description, it will check iptc:Caption-Abstract.
A valid description means the fields are filled in and not too long (see `:instance, :description_limit`).
"""
@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)
+ System.cmd("exiftool", ["-b", "-s3", tag, file],
+ stderr_to_stdout: false,
+ parallelism: true
+ )
tag_content = String.trim(tag_content)
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
diff --git a/test/fixtures/image_with_imagedescription_and_caption-abstract_and_stray_data_after.png b/test/fixtures/image_with_imagedescription_and_caption-abstract_and_stray_data_after.png
new file mode 100644
index 000000000..7ce8640fa
Binary files /dev/null and b/test/fixtures/image_with_imagedescription_and_caption-abstract_and_stray_data_after.png differ
diff --git a/test/fixtures/image_with_stray_data_after.png b/test/fixtures/image_with_stray_data_after.png
new file mode 100755
index 000000000..a280e4377
Binary files /dev/null and b/test/fixtures/image_with_stray_data_after.png differ
diff --git a/test/pleroma/upload/filter/exiftool/read_description_test.exs b/test/pleroma/upload/filter/exiftool/read_description_test.exs
index 7389fda47..7cc83969d 100644
--- a/test/pleroma/upload/filter/exiftool/read_description_test.exs
+++ b/test/pleroma/upload/filter/exiftool/read_description_test.exs
@@ -1,117 +1,144 @@
# 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.Exiftool.ReadDescriptionTest do
use Pleroma.DataCase, async: true
alias Pleroma.Upload.Filter
@uploads %Pleroma.Upload{
name: "image_with_imagedescription_and_caption-abstract.jpg",
content_type: "image/jpeg",
path: Path.absname("test/fixtures/image_with_imagedescription_and_caption-abstract.jpg"),
tempfile: Path.absname("test/fixtures/image_with_imagedescription_and_caption-abstract.jpg"),
description: nil
}
test "keeps description when not empty" do
uploads = %Pleroma.Upload{
name: "image_with_imagedescription_and_caption-abstract.jpg",
content_type: "image/jpeg",
path: Path.absname("test/fixtures/image_with_imagedescription_and_caption-abstract.jpg"),
tempfile:
Path.absname("test/fixtures/image_with_imagedescription_and_caption-abstract.jpg"),
description: "Some description"
}
assert Filter.Exiftool.ReadDescription.filter(uploads) ==
{:ok, :noop}
end
test "otherwise returns ImageDescription when present" do
uploads_after = %Pleroma.Upload{
name: "image_with_imagedescription_and_caption-abstract.jpg",
content_type: "image/jpeg",
path: Path.absname("test/fixtures/image_with_imagedescription_and_caption-abstract.jpg"),
tempfile:
Path.absname("test/fixtures/image_with_imagedescription_and_caption-abstract.jpg"),
description: "a descriptive white pixel"
}
assert Filter.Exiftool.ReadDescription.filter(@uploads) ==
{:ok, :filtered, uploads_after}
end
+ test "Ignores warnings" do
+ uploads = %Pleroma.Upload{
+ name: "image_with_imagedescription_and_caption-abstract_and_stray_data_after.png",
+ content_type: "image/png",
+ path:
+ Path.absname(
+ "test/fixtures/image_with_imagedescription_and_caption-abstract_and_stray_data_after.png"
+ ),
+ tempfile:
+ Path.absname(
+ "test/fixtures/image_with_imagedescription_and_caption-abstract_and_stray_data_after.png"
+ )
+ }
+
+ assert {:ok, :filtered, %{description: "a descriptive white pixel"}} =
+ Filter.Exiftool.ReadDescription.filter(uploads)
+
+ uploads = %Pleroma.Upload{
+ name: "image_with_stray_data_after.png",
+ content_type: "image/png",
+ path: Path.absname("test/fixtures/image_with_stray_data_after.png"),
+ tempfile: Path.absname("test/fixtures/image_with_stray_data_after.png")
+ }
+
+ assert {:ok, :filtered, %{description: nil}} = Filter.Exiftool.ReadDescription.filter(uploads)
+ end
+
test "otherwise returns iptc:Caption-Abstract when present" do
upload = %Pleroma.Upload{
name: "image_with_caption-abstract.jpg",
content_type: "image/jpeg",
path: Path.absname("test/fixtures/image_with_caption-abstract.jpg"),
tempfile: Path.absname("test/fixtures/image_with_caption-abstract.jpg"),
description: nil
}
upload_after = %Pleroma.Upload{
name: "image_with_caption-abstract.jpg",
content_type: "image/jpeg",
path: Path.absname("test/fixtures/image_with_caption-abstract.jpg"),
tempfile: Path.absname("test/fixtures/image_with_caption-abstract.jpg"),
description: "an abstract white pixel"
}
assert Filter.Exiftool.ReadDescription.filter(upload) ==
{:ok, :filtered, upload_after}
end
test "otherwise returns nil" do
uploads = %Pleroma.Upload{
name: "image_with_no_description.jpg",
content_type: "image/jpeg",
path: Path.absname("test/fixtures/image_with_no_description.jpg"),
tempfile: Path.absname("test/fixtures/image_with_no_description.jpg"),
description: nil
}
assert Filter.Exiftool.ReadDescription.filter(uploads) ==
{:ok, :filtered, uploads}
end
test "Return nil when image description from EXIF data exceeds the maximum length" do
clear_config([:instance, :description_limit], 5)
assert Filter.Exiftool.ReadDescription.filter(@uploads) ==
{:ok, :filtered, @uploads}
end
test "Ignores content with only whitespace" do
uploads = %Pleroma.Upload{
name: "non-existant.jpg",
content_type: "image/jpeg",
path:
Path.absname(
"test/fixtures/image_with_imagedescription_and_caption-abstract_whitespaces.jpg"
),
tempfile:
Path.absname(
"test/fixtures/image_with_imagedescription_and_caption-abstract_whitespaces.jpg"
),
description: nil
}
assert Filter.Exiftool.ReadDescription.filter(uploads) ==
{:ok, :filtered, uploads}
end
test "Return nil when image description from EXIF data can't be read" do
uploads = %Pleroma.Upload{
name: "non-existant.jpg",
content_type: "image/jpeg",
path: Path.absname("test/fixtures/non-existant.jpg"),
tempfile: Path.absname("test/fixtures/non-existant_tmp.jpg"),
description: nil
}
assert Filter.Exiftool.ReadDescription.filter(uploads) ==
{:ok, :filtered, uploads}
end
end

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