From e349e92a441840bbbdbf13cacd307e65f85a38ff Mon Sep 17 00:00:00 2001 From: tusooa Date: Wed, 12 Jul 2023 14:27:29 -0400 Subject: [PATCH] Add mrf to force link tag of quoting posts --- docs/configuration/cheatsheet.md | 1 + lib/pleroma/constants.ex | 4 + .../mrf/quote_to_link_tag_policy.ex | 49 +++++++++++++ .../object_validators/common_fixes.ex | 16 ++-- .../mrf/quote_to_link_tag_policy_test.exs | 73 +++++++++++++++++++ 5 files changed, 134 insertions(+), 9 deletions(-) create mode 100644 lib/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy.ex create mode 100644 test/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy_test.exs diff --git a/docs/configuration/cheatsheet.md b/docs/configuration/cheatsheet.md index a17f8735a..a4cae4dbb 100644 --- a/docs/configuration/cheatsheet.md +++ b/docs/configuration/cheatsheet.md @@ -161,6 +161,7 @@ To add configuration to your config file, you can copy it from the base config. * `Pleroma.Web.ActivityPub.MRF.KeywordPolicy`: Rejects or removes from the federated timeline or replaces keywords. (See [`:mrf_keyword`](#mrf_keyword)). * `Pleroma.Web.ActivityPub.MRF.ForceMentionsInContent`: Forces every mentioned user to be reflected in the post content. * `Pleroma.Web.ActivityPub.MRF.InlineQuotePolicy`: Forces quote post URLs to be reflected in the message content inline. + * `Pleroma.Web.ActivityPub.MRF.QuoteToLinkTagPolicy`: Force a Link tag for posts quoting another post. (may break outgoing federation of quote posts with older Pleroma versions) * `transparency`: Make the content of your Message Rewrite Facility settings public (via nodeinfo). * `transparency_exclusions`: Exclude specific instance names from MRF transparency. The use of the exclusions feature will be disclosed in nodeinfo as a boolean value. diff --git a/lib/pleroma/constants.ex b/lib/pleroma/constants.ex index 9d764ec25..ed60bcc37 100644 --- a/lib/pleroma/constants.ex +++ b/lib/pleroma/constants.ex @@ -84,6 +84,10 @@ defmodule Pleroma.Constants do const(upload_object_types, do: ["Document", "Image"]) + const(activity_json_canonical_mime_type, + do: "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"" + ) + const(activity_json_mime_types, do: [ "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"", diff --git a/lib/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy.ex b/lib/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy.ex new file mode 100644 index 000000000..f1c573d1b --- /dev/null +++ b/lib/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy.ex @@ -0,0 +1,49 @@ +# Pleroma: A lightweight social networking server +# Copyright © 2017-2023 Pleroma Authors +# SPDX-License-Identifier: AGPL-3.0-only + +defmodule Pleroma.Web.ActivityPub.MRF.QuoteToLinkTagPolicy do + @moduledoc "Force a Link tag for posts quoting another post. (may break outgoing federation of quote posts with older Pleroma versions)" + @behaviour Pleroma.Web.ActivityPub.MRF.Policy + + alias Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes + + require Pleroma.Constants + + @impl Pleroma.Web.ActivityPub.MRF.Policy + def filter(%{"object" => %{"quoteUrl" => _} = object} = activity) do + {:ok, Map.put(activity, "object", filter_object(object))} + end + + @impl Pleroma.Web.ActivityPub.MRF.Policy + def filter(object), do: {:ok, object} + + @impl Pleroma.Web.ActivityPub.MRF.Policy + def describe, do: {:ok, %{}} + + @impl Pleroma.Web.ActivityPub.MRF.Policy + def history_awareness, do: :auto + + defp filter_object(%{"quoteUrl" => quote_url} = object) do + tags = object["tag"] || [] + + if Enum.any?(tags, fn tag -> + CommonFixes.is_object_link_tag(tag) and tag["href"] == quote_url + end) do + object + else + object + |> Map.put( + "tag", + tags ++ + [ + %{ + "type" => "Link", + "mediaType" => Pleroma.Constants.activity_json_canonical_mime_type(), + "href" => quote_url + } + ] + ) + end + end +end diff --git a/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex b/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex index 65b8d9a2c..4d9be0bdd 100644 --- a/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex +++ b/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex @@ -112,16 +112,14 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes do def fix_quote_url(data), do: data # https://codeberg.org/fediverse/fep/src/branch/main/fep/e232/fep-e232.md - defp is_object_link_tag( - %{ - "type" => "Link", - "mediaType" => media_type, - "href" => href - } = tag - ) - when media_type in Pleroma.Constants.activity_json_mime_types() and is_binary(href) do + def is_object_link_tag(%{ + "type" => "Link", + "mediaType" => media_type, + "href" => href + }) + when media_type in Pleroma.Constants.activity_json_mime_types() and is_binary(href) do true end - defp is_object_link_tag(_), do: false + def is_object_link_tag(_), do: false end diff --git a/test/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy_test.exs b/test/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy_test.exs new file mode 100644 index 000000000..96b49b6a0 --- /dev/null +++ b/test/pleroma/web/activity_pub/mrf/quote_to_link_tag_policy_test.exs @@ -0,0 +1,73 @@ +# Pleroma: A lightweight social networking server +# Copyright © 2017-2023 Pleroma Authors +# SPDX-License-Identifier: AGPL-3.0-only + +defmodule Pleroma.Web.ActivityPub.MRF.QuoteToLinkTagPolicyTest do + alias Pleroma.Web.ActivityPub.MRF.QuoteToLinkTagPolicy + + use Pleroma.DataCase + + require Pleroma.Constants + + test "Add quote url to Link tag" do + quote_url = "https://gleasonator.com/objects/1234" + + activity = %{ + "type" => "Create", + "actor" => "https://gleasonator.com/users/alex", + "object" => %{ + "type" => "Note", + "content" => "Nice post", + "quoteUrl" => quote_url + } + } + + {:ok, %{"object" => object}} = QuoteToLinkTagPolicy.filter(activity) + + assert object["tag"] == [ + %{ + "type" => "Link", + "href" => quote_url, + "mediaType" => Pleroma.Constants.activity_json_canonical_mime_type() + } + ] + end + + test "Add quote url to Link tag, append to the end" do + quote_url = "https://gleasonator.com/objects/1234" + + activity = %{ + "type" => "Create", + "actor" => "https://gleasonator.com/users/alex", + "object" => %{ + "type" => "Note", + "content" => "Nice post", + "quoteUrl" => quote_url, + "tag" => [%{"type" => "Hashtag", "name" => "#foo"}] + } + } + + {:ok, %{"object" => object}} = QuoteToLinkTagPolicy.filter(activity) + + assert [_, tag] = object["tag"] + + assert tag == %{ + "type" => "Link", + "href" => quote_url, + "mediaType" => Pleroma.Constants.activity_json_canonical_mime_type() + } + end + + test "Bypass posts without quoteUrl" do + activity = %{ + "type" => "Create", + "actor" => "https://gleasonator.com/users/alex", + "object" => %{ + "type" => "Note", + "content" => "Nice post" + } + } + + assert {:ok, ^activity} = QuoteToLinkTagPolicy.filter(activity) + end +end