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Fix processing of remote Delete activities (#16084)

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* Add tests

* Ensure deleted statuses are marked as such

* Save some redis memory by not storing URIs in delete_upon_arrival values

* Avoid possible race condition when processing incoming Deletes

* Avoid potential duplicate Delete forwards

* Lower lock durations to reduce issues in case of hard crash of the Rails process

* Check for `lock.aquired?` and improve comment

* Refactor RedisLock usage in app/lib/activitypub

* Fix using incorrect or non-existent sender for relaying Deletes
This commit is contained in:
Claire 2021-04-21 04:46:09 +02:00 • committed by GitHub
parent 2c322addf3
commit 0b36e3419d
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6 changed files with 94 additions and 82 deletions
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36
app/lib/activitypub/activity/announce.rb
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@ -4,29 +4,25 @@ class ActivityPub::Activity::Announce < ActivityPub::Activity
def perform
return reject_payload! if delete_arrived_first?(@json['id']) || !related_to_local_activity?
RedisLock.acquire(lock_options) do |lock|
if lock.acquired?
original_status = status_from_object
lock_or_fail("announce:#{@object['id']}") do
original_status = status_from_object
return reject_payload! if original_status.nil? || !announceable?(original_status)
return reject_payload! if original_status.nil? || !announceable?(original_status)
@status = Status.find_by(account: @account, reblog: original_status)
@status = Status.find_by(account: @account, reblog: original_status)
return @status unless @status.nil?
return @status unless @status.nil?
@status = Status.create!(
account: @account,
reblog: original_status,
uri: @json['id'],
created_at: @json['published'],
override_timestamps: @options[:override_timestamps],
visibility: visibility_from_audience
)
@status = Status.create!(
account: @account,
reblog: original_status,
uri: @json['id'],
created_at: @json['published'],
override_timestamps: @options[:override_timestamps],
visibility: visibility_from_audience
)
distribute(@status)
else
raise Mastodon::RaceConditionError
end
distribute(@status)
end
@status
@ -69,8 +65,4 @@ class ActivityPub::Activity::Announce < ActivityPub::Activity
def reblog_of_local_status?
status_from_uri(object_uri)&.account&.local?
end
def lock_options
{ redis: Redis.current, key: "announce:#{@object['id']}" }
end
end