Use EXIF data of image to prefill image description

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.
This commit is contained in:
Ilja 2022-02-14 13:14:25 +01:00
parent 75f912c63f
commit cd316d7269
11 changed files with 219 additions and 14 deletions

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@ -633,6 +633,12 @@ This filter only strips the GPS and location metadata with Exiftool leaving colo
No specific configuration.
#### Pleroma.Upload.Filter.ExiftoolReadData
This filter only reads metadata with Exiftool so clients can prefill the media description field.
No specific configuration.
#### Pleroma.Upload.Filter.Mogrify
* `args`: List of actions for the `mogrify` command like `"strip"` or `["strip", "auto-orient", {"implode", "1"}]`.

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@ -30,3 +30,4 @@ It is required for the following Pleroma features:
It is required for the following Pleroma features:
* `Pleroma.Upload.Filters.Exiftool` upload filter (related config: `Plaroma.Upload/filters` in `config/config.exs`)
* `Pleroma.Upload.Filters.ExiftoolReadData` upload filter (related config: `Plaroma.Upload/filters` in `config/config.exs`)

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@ -35,6 +35,7 @@ defmodule Mix.Tasks.Pleroma.Instance do
listen_ip: :string,
listen_port: :string,
strip_uploads: :string,
read_uploads_data: :string,
anonymize_uploads: :string,
dedupe_uploads: :string
],
@ -178,6 +179,23 @@ defmodule Mix.Tasks.Pleroma.Instance do
strip_uploads_default
) === "y"
{read_uploads_data_message, read_uploads_data_default} =
if Pleroma.Utils.command_available?("exiftool") do
{"Do you want to read data from uploaded files so clients can use it to prefill fields like image description? This requires exiftool, it was detected as installed. (y/n)",
"y"}
else
{"Do you want to read data from uploaded files so clients can use it to prefill fields like image description? This requires exiftool, it was detected as not installed, please install it if you answer yes. (y/n)",
"n"}
end
read_uploads_data =
get_option(
options,
:read_uploads_data,
read_uploads_data_message,
read_uploads_data_default
) === "y"
anonymize_uploads =
get_option(
options,
@ -230,6 +248,7 @@ defmodule Mix.Tasks.Pleroma.Instance do
upload_filters:
upload_filters(%{
strip: strip_uploads,
read_data: read_uploads_data,
anonymize: anonymize_uploads,
dedupe: dedupe_uploads
})
@ -303,6 +322,13 @@ defmodule Mix.Tasks.Pleroma.Instance do
[]
end
enabled_filters =
if filters.read_data do
enabled_filters ++ [Pleroma.Upload.Filter.ExiftoolReadData]
else
enabled_filters
end
enabled_filters =
if filters.anonymize do
enabled_filters ++ [Pleroma.Upload.Filter.AnonymizeFilename]

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@ -165,6 +165,7 @@ defmodule Pleroma.ApplicationRequirements do
defp check_system_commands!(:ok) do
filter_commands_statuses = [
check_filter(Pleroma.Upload.Filter.Exiftool, "exiftool"),
check_filter(Pleroma.Upload.Filter.ExiftoolReadData, "exiftool"),
check_filter(Pleroma.Upload.Filter.Mogrify, "mogrify"),
check_filter(Pleroma.Upload.Filter.Mogrifun, "mogrify"),
check_filter(Pleroma.Upload.Filter.AnalyzeMetadata, "mogrify"),

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@ -60,12 +60,23 @@ defmodule Pleroma.Upload do
width: integer(),
height: integer(),
blurhash: String.t(),
description: String.t(),
path: String.t()
}
defstruct [:id, :name, :tempfile, :content_type, :width, :height, :blurhash, :path]
defstruct [
:id,
:name,
:tempfile,
:content_type,
:width,
:height,
:blurhash,
:description,
:path
]
defp get_description(opts, upload) do
case {opts[:description], Pleroma.Config.get([Pleroma.Upload, :default_description])} do
defp get_description(upload) do
case {upload.description, Pleroma.Config.get([Pleroma.Upload, :default_description])} do
{description, _} when is_binary(description) -> description
{_, :filename} -> upload.name
{_, str} when is_binary(str) -> str
@ -81,7 +92,7 @@ defmodule Pleroma.Upload do
with {:ok, upload} <- prepare_upload(upload, opts),
upload = %__MODULE__{upload | path: upload.path || "#{upload.id}/#{upload.name}"},
{:ok, upload} <- Pleroma.Upload.Filter.filter(opts.filters, upload),
description = get_description(opts, upload),
description = get_description(upload),
{_, true} <-
{:description_limit,
String.length(description) <= Pleroma.Config.get([:instance, :description_limit])},
@ -152,7 +163,8 @@ defmodule Pleroma.Upload do
id: UUID.generate(),
name: file.filename,
tempfile: file.path,
content_type: file.content_type
content_type: file.content_type,
description: opts.description
}}
end
end
@ -172,7 +184,8 @@ defmodule Pleroma.Upload do
id: UUID.generate(),
name: hash <> "." <> ext,
tempfile: tmp_path,
content_type: content_type
content_type: content_type,
description: opts.description
}}
end
end

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@ -0,0 +1,47 @@
# 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

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@ -69,6 +69,8 @@ defmodule Mix.Tasks.Pleroma.InstanceTest do
"./test/../test/instance/static/",
"--strip-uploads",
"y",
"--read-uploads-data",
"y",
"--dedupe-uploads",
"n",
"--anonymize-uploads",
@ -91,7 +93,10 @@ defmodule Mix.Tasks.Pleroma.InstanceTest do
assert generated_config =~ "password: \"dbpass\""
assert generated_config =~ "configurable_from_database: true"
assert generated_config =~ "http: [ip: {127, 0, 0, 1}, port: 4000]"
assert generated_config =~ "filters: [Pleroma.Upload.Filter.Exiftool]"
assert generated_config =~
"filters: [Pleroma.Upload.Filter.Exiftool, Pleroma.Upload.Filter.ExiftoolReadData]"
assert File.read!(tmp_path() <> "setup.psql") == generated_setup_psql()
assert File.exists?(Path.expand("./test/instance/static/robots.txt"))
end

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@ -0,0 +1,106 @@
# 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.ExiftoolReadDataTest do
use Pleroma.DataCase, async: true
alias Pleroma.Upload.Filter
@uploads %Pleroma.Upload{
name: "portrait_of_owls_imagedescription_and_caption-abstract.jpg",
content_type: "image/jpeg",
path:
Path.absname("test/fixtures/portrait_of_owls_imagedescription_and_caption-abstract.jpg"),
tempfile:
Path.absname("test/fixtures/portrait_of_owls_imagedescription_and_caption-abstract_tmp.jpg"),
description: nil
}
test "keeps description when not empty" do
uploads = %Pleroma.Upload{
name: "portrait_of_owls_imagedescription_and_caption-abstract.jpg",
content_type: "image/jpeg",
path:
Path.absname("test/fixtures/portrait_of_owls_imagedescription_and_caption-abstract.jpg"),
tempfile:
Path.absname(
"test/fixtures/portrait_of_owls_imagedescription_and_caption-abstract_tmp.jpg"
),
description: "Eight different owls"
}
assert Filter.ExiftoolReadData.filter(uploads) ==
{:ok, :noop}
end
test "otherwise returns ImageDescription when present" do
uploads_after = %Pleroma.Upload{
name: "portrait_of_owls_imagedescription_and_caption-abstract.jpg",
content_type: "image/jpeg",
path:
Path.absname("test/fixtures/portrait_of_owls_imagedescription_and_caption-abstract.jpg"),
tempfile:
Path.absname(
"test/fixtures/portrait_of_owls_imagedescription_and_caption-abstract_tmp.jpg"
),
description: "Pictures of eight different owls"
}
assert Filter.ExiftoolReadData.filter(@uploads) ==
{:ok, :filtered, uploads_after}
end
test "otherwise returns iptc:Caption-Abstract when present" do
upload = %Pleroma.Upload{
name: "portrait_of_owls_caption-abstract.jpg",
content_type: "image/jpeg",
path: Path.absname("test/fixtures/portrait_of_owls_caption-abstract.jpg"),
tempfile: Path.absname("test/fixtures/portrait_of_owls_caption-abstract_tmp.jpg"),
description: nil
}
upload_after = %Pleroma.Upload{
name: "portrait_of_owls_caption-abstract.jpg",
content_type: "image/jpeg",
path: Path.absname("test/fixtures/portrait_of_owls_caption-abstract.jpg"),
tempfile: Path.absname("test/fixtures/portrait_of_owls_caption-abstract_tmp.jpg"),
description: "Pictures of eight different owls - iptc"
}
assert Filter.ExiftoolReadData.filter(upload) ==
{:ok, :filtered, upload_after}
end
test "otherwise returns nil" do
uploads = %Pleroma.Upload{
name: "portrait_of_owls_no_description-abstract.jpg",
content_type: "image/jpeg",
path: Path.absname("test/fixtures/portrait_of_owls_no_description.jpg"),
tempfile: Path.absname("test/fixtures/portrait_of_owls_no_description_tmp.jpg"),
description: nil
}
assert Filter.ExiftoolReadData.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.ExiftoolReadData.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.ExiftoolReadData.filter(uploads) ==
{:ok, :filtered, uploads}
end
end