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Fix spurious edits and require incoming edits to be explicitly marked as such (#17918) 

* Change post text edit to not be considered significant if it's identical after reformatting

* We don't need to clear previous change information anymore

* Require status edits to be explicit, except for poll tallies

* Fix tests

* Add some tests

* Add poll-related tests

* Add HTML-formatting related tests
This commit is contained in:
Claire 2022-04-06 21:01:02 +02:00 committed by GitHub
parent 454ef42aab
commit 8f91e304a5
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3 changed files with 220 additions and 12 deletions
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50
app/services/activitypub/process_status_update_service.rb
View File

@ -17,10 +17,19 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
# Only native types can be updated at the moment
return @status if !expected_type? || already_updated_more_recently?
last_edit_date = status.edited_at.presence || status.created_at
if @status_parser.edited_at.present? && (@status.edited_at.nil? || @status_parser.edited_at > @status.edited_at)
handle_explicit_update!
else
handle_implicit_update!
end
# Since we rely on tracking of previous changes, ensure clean slate
status.clear_changes_information
@status
end
private
def handle_explicit_update!
last_edit_date = @status.edited_at.presence || @status.created_at
# Only allow processing one create/update per status at a time
RedisLock.acquire(lock_options) do |lock|
@ -45,12 +54,20 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
end
end
forward_activity! if significant_changes? && @status_parser.edited_at.present? && @status_parser.edited_at > last_edit_date
@status
forward_activity! if significant_changes? && @status_parser.edited_at > last_edit_date
end
private
def handle_implicit_update!
RedisLock.acquire(lock_options) do |lock|
if lock.acquired?
update_poll!(allow_significant_changes: false)
else
raise Mastodon::RaceConditionError
end
end
queue_poll_notifications!
end
def update_media_attachments!
previous_media_attachments = @status.media_attachments.to_a
@ -98,7 +115,7 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
@media_attachments_changed = true if @status.ordered_media_attachment_ids != previous_media_attachments_ids
end
def update_poll!
def update_poll!(allow_significant_changes: true)
previous_poll = @status.preloadable_poll
@previous_expires_at = previous_poll&.expires_at
poll_parser = ActivityPub::Parser::PollParser.new(@json)
@ -109,6 +126,7 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
# If for some reasons the options were changed, it invalidates all previous
# votes, so we need to remove them
@poll_changed = true if poll_parser.significantly_changes?(poll)
return if @poll_changed && !allow_significant_changes
poll.last_fetched_at = Time.now.utc
poll.options = poll_parser.options
@ -121,6 +139,8 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
@status.poll_id = poll.id
elsif previous_poll.present?
return unless allow_significant_changes
previous_poll.destroy!
@poll_changed = true
@status.poll_id = nil
@ -132,7 +152,10 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
@status.spoiler_text = @status_parser.spoiler_text || ''
@status.sensitive = @account.sensitized? || @status_parser.sensitive || false
@status.language = @status_parser.language
@status.edited_at = @status_parser.edited_at || Time.now.utc if significant_changes?
@significant_changes = text_significantly_changed? || @status.spoiler_text_changed? || @media_attachments_changed || @poll_changed
@status.edited_at = @status_parser.edited_at if significant_changes?
@status.save!
end
@ -243,7 +266,14 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
end
def significant_changes?
@status.text_changed? || @status.text_previously_changed? || @status.spoiler_text_changed? || @status.spoiler_text_previously_changed? || @media_attachments_changed || @poll_changed
@significant_changes
end
def text_significantly_changed?
return false unless @status.text_changed?
old, new = @status.text_change
HtmlAwareFormatter.new(old, false).to_s != HtmlAwareFormatter.new(new, false).to_s
end
def already_updated_more_recently?

4
spec/services/activitypub/fetch_remote_status_service_spec.rb
View File

@ -195,7 +195,7 @@ RSpec.describe ActivityPub::FetchRemoteStatusService, type: :service do
let(:existing_status) { Fabricate(:status, account: sender, text: 'Foo', uri: note[:id]) }
context 'with a Note object' do
let(:object) { note }
let(:object) { note.merge(updated: '2021-09-08T22:39:25Z') }
it 'updates status' do
existing_status.reload
@ -211,7 +211,7 @@ RSpec.describe ActivityPub::FetchRemoteStatusService, type: :service do
id: "https://#{valid_domain}/@foo/1234/create",
type: 'Create',
actor: ActivityPub::TagManager.instance.uri_for(sender),
object: note,
object: note.merge(updated: '2021-09-08T22:39:25Z'),
}
end

178
spec/services/activitypub/process_status_update_service_spec.rb
View File

@ -1,5 +1,9 @@
require 'rails_helper'
def poll_option_json(name, votes)
{ type: 'Note', name: name, replies: { type: 'Collection', totalItems: votes } }
end
RSpec.describe ActivityPub::ProcessStatusUpdateService, type: :service do
let!(:status) { Fabricate(:status, text: 'Hello world', account: Fabricate(:account, domain: 'example.com')) }
@ -46,6 +50,180 @@ RSpec.describe ActivityPub::ProcessStatusUpdateService, type: :service do
expect(status.reload.spoiler_text).to eq 'Show more'
end
context 'when the changes are only in sanitized-out HTML' do
let!(:status) { Fabricate(:status, text: '<p>Hello world <a href="https://joinmastodon.org" rel="nofollow">joinmastodon.org</a></p>', account: Fabricate(:account, domain: 'example.com')) }
let(:payload) do
{
'@context': 'https://www.w3.org/ns/activitystreams',
id: 'foo',
type: 'Note',
updated: '2021-09-08T22:39:25Z',
content: '<p>Hello world <a href="https://joinmastodon.org" rel="noreferrer">joinmastodon.org</a></p>',
}
end
before do
subject.call(status, json)
end
it 'does not create any edits' do
expect(status.reload.edits).to be_empty
end
it 'does not mark status as edited' do
expect(status.edited?).to be false
end
end
context 'when the status has not been explicitly edited' do
let(:payload) do
{
'@context': 'https://www.w3.org/ns/activitystreams',
id: 'foo',
type: 'Note',
content: 'Updated text',
}
end
before do
subject.call(status, json)
end
it 'does not create any edits' do
expect(status.reload.edits).to be_empty
end
it 'does not mark status as edited' do
expect(status.reload.edited?).to be false
end
it 'does not update the text' do
expect(status.reload.text).to eq 'Hello world'
end
end
context 'when the status has not been explicitly edited and features a poll' do
let(:account) { Fabricate(:account, domain: 'example.com') }
let!(:expiration) { 10.days.from_now.utc }
let!(:status) do
Fabricate(:status,
text: 'Hello world',
account: account,
poll_attributes: {
options: %w(Foo Bar),
account: account,
multiple: false,
hide_totals: false,
expires_at: expiration
}
)
end
let(:payload) do
{
'@context': 'https://www.w3.org/ns/activitystreams',
id: 'https://example.com/foo',
type: 'Question',
content: 'Hello world',
endTime: expiration.iso8601,
oneOf: [
poll_option_json('Foo', 4),
poll_option_json('Bar', 3),
],
}
end
before do
subject.call(status, json)
end
it 'does not create any edits' do
expect(status.reload.edits).to be_empty
end
it 'does not mark status as edited' do
expect(status.reload.edited?).to be false
end
it 'does not update the text' do
expect(status.reload.text).to eq 'Hello world'
end
it 'updates tallies' do
expect(status.poll.reload.cached_tallies).to eq [4, 3]
end
end
context 'when the status changes a poll despite being not explicitly marked as updated' do
let(:account) { Fabricate(:account, domain: 'example.com') }
let!(:expiration) { 10.days.from_now.utc }
let!(:status) do
Fabricate(:status,
text: 'Hello world',
account: account,
poll_attributes: {
options: %w(Foo Bar),
account: account,
multiple: false,
hide_totals: false,
expires_at: expiration
}
)
end
let(:payload) do
{
'@context': 'https://www.w3.org/ns/activitystreams',
id: 'https://example.com/foo',
type: 'Question',
content: 'Hello world',
endTime: expiration.iso8601,
oneOf: [
poll_option_json('Foo', 4),
poll_option_json('Bar', 3),
poll_option_json('Baz', 3),
],
}
end
before do
subject.call(status, json)
end
it 'does not create any edits' do
expect(status.reload.edits).to be_empty
end
it 'does not mark status as edited' do
expect(status.reload.edited?).to be false
end
it 'does not update the text' do
expect(status.reload.text).to eq 'Hello world'
end
it 'does not update tallies' do
expect(status.poll.reload.cached_tallies).to eq [0, 0]
end
end
context 'when receiving an edit older than the latest processed' do
before do
status.snapshot!(at_time: status.created_at, rate_limit: false)
status.update!(text: 'Hello newer world', edited_at: Time.now.utc)
status.snapshot!(rate_limit: false)
end
it 'does not create any edits' do
expect { subject.call(status, json) }.not_to change { status.reload.edits.pluck(&:id) }
end
it 'does not update the text, spoiler_text or edited_at' do
expect { subject.call(status, json) }.not_to change { s = status.reload; [s.text, s.spoiler_text, s.edited_at] }
end
end
context 'with no changes at all' do
let(:payload) do
{