Support Exiftool for stripping EXIF data

We really only want to strip location data anyway, and mogrify strips color profiles.
This commit is contained in:
Mark Felder 2020-07-10 16:46:26 -05:00
parent d6f67fa91b
commit 6167593881
8 changed files with 67 additions and 9 deletions

1
.gitignore vendored
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@ -5,6 +5,7 @@
/*.ez
/test/uploads
/.elixir_ls
/test/fixtures/DSCN0010_tmp.jpg
/test/fixtures/test_tmp.txt
/test/fixtures/image_tmp.jpg
/test/tmp/

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@ -58,6 +58,7 @@ unit-testing:
alias: postgres
command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
script:
- apt-get update && apt-get install -y libimage-exiftool-perl
- mix deps.get
- mix ecto.create
- mix ecto.migrate
@ -89,6 +90,7 @@ unit-testing-rum:
<<: *global_variables
RUM_ENABLED: "true"
script:
- apt-get update && apt-get install -y libimage-exiftool-perl
- mix deps.get
- mix ecto.create
- mix ecto.migrate

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@ -57,6 +57,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
- MRF (`EmojiStealPolicy`): New MRF Policy which allows to automatically download emojis from remote instances
- Support pagination in emoji packs API (for packs and for files in pack)
- Support for viewing instances favicons next to posts and accounts
- Added Pleroma.Upload.Filter.Exiftool as an alternate EXIF stripping mechanism targeting GPS/location metadata.
<details>
<summary>API Changes</summary>

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@ -33,7 +33,7 @@ ARG DATA=/var/lib/pleroma
RUN echo "http://nl.alpinelinux.org/alpine/latest-stable/community" >> /etc/apk/repositories &&\
apk update &&\
apk add imagemagick ncurses postgresql-client &&\
apk add exiftool imagemagick ncurses postgresql-client &&\
adduser --system --shell /bin/false --home ${HOME} pleroma &&\
mkdir -p ${DATA}/uploads &&\
mkdir -p ${DATA}/static &&\

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@ -548,14 +548,6 @@ config :ex_aws, :s3,
### Upload filters
#### Pleroma.Upload.Filter.Mogrify
* `args`: List of actions for the `mogrify` command like `"strip"` or `["strip", "auto-orient", {"implode", "1"}]`.
#### Pleroma.Upload.Filter.Dedupe
No specific configuration.
#### Pleroma.Upload.Filter.AnonymizeFilename
This filter replaces the filename (not the path) of an upload. For complete obfuscation, add
@ -563,6 +555,20 @@ This filter replaces the filename (not the path) of an upload. For complete obfu
* `text`: Text to replace filenames in links. If empty, `{random}.extension` will be used. You can get the original filename extension by using `{extension}`, for example `custom-file-name.{extension}`.
#### Pleroma.Upload.Filter.Dedupe
No specific configuration.
#### Pleroma.Upload.Filter.Exiftool
This filter only strips the GPS and location metadata with Exiftool leaving color profiles and attributes intact.
No specific configuration.
#### Pleroma.Upload.Filter.Mogrify
* `args`: List of actions for the `mogrify` command like `"strip"` or `["strip", "auto-orient", {"implode", "1"}]`.
## Email
### Pleroma.Emails.Mailer

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@ -0,0 +1,17 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Upload.Filter.Exiftool do
@behaviour Pleroma.Upload.Filter
@type conversion :: action :: String.t() | {action :: String.t(), opts :: String.t()}
@type conversions :: conversion() | [conversion()]
def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
System.cmd("exiftool", ["-overwrite_original", "-gps:all=", file], parallelism: true)
:ok
end
def filter(_), do: :ok
end

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Upload.Filter.ExiftoolTest do
use Pleroma.DataCase
alias Pleroma.Upload.Filter
test "apply exiftool filter" do
File.cp!(
"test/fixtures/DSCN0010.jpg",
"test/fixtures/DSCN0010_tmp.jpg"
)
upload = %Pleroma.Upload{
name: "image_with_GPS_data.jpg",
content_type: "image/jpg",
path: Path.absname("test/fixtures/DSCN0010.jpg"),
tempfile: Path.absname("test/fixtures/DSCN0010_tmp.jpg")
}
assert Filter.Exiftool.filter(upload) == :ok
{exif_original, 0} = System.cmd("exiftool", ["test/fixtures/DSCN0010.jpg"])
{exif_filtered, 0} = System.cmd("exiftool", ["test/fixtures/DSCN0010_tmp.jpg"])
refute exif_original == exif_filtered
assert String.match?(exif_original, ~r/GPS/)
refute String.match?(exif_filtered, ~r/GPS/)
end
end