about summary refs log tree commit diff
path: root/app/services/remove_status_service.rb
blob: 42ae9591df006a357bdfb450c94e2f23c210d194 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
# frozen_string_literal: true

class RemoveStatusService < BaseService
  include Redisable
  include Payloadable

  MIN_SCHEDULE_OFFSET = 60.seconds.freeze

  # Delete a status
  # @param   [Status] status
  # @param   [Hash] options
  # @option  [Boolean] :redraft
  # @options [Boolean] :original_removed
  def call(status, **options)
    @payload  = Oj.dump(event: :delete, payload: status.id.to_s)
    @status   = status
    @account  = status.account
    @tags     = status.tags.pluck(:name).to_a
    @mentions = status.active_mentions.includes(:account).to_a
    @reblogs  = status.reblogs.includes(:account).to_a
    @options  = options

    unless options[:defederate_only]
      RedisLock.acquire(lock_options) do |lock|
        if lock.acquired?
          remove_from_queued
          remove_from_self if status.account.local?
          remove_from_followers
          remove_from_lists
          remove_from_affected
          remove_reblogs
          remove_from_hashtags
          remove_from_public
          remove_from_media if status.media_attachments.any?
          remove_from_direct if status.direct_visibility?
          remove_from_spam_check
          remove_media

          @status.destroy!
        else
          raise Mastodon::RaceConditionError
        end
      end
    end

    # There is no reason to send out Undo activities when the
    # cause is that the original object has been removed, since
    # original object being removed implicitly removes reblogs
    # of it. The Delete activity of the original is forwarded
    # separately.
    return if !@account.local? || @options[:original_removed]

    remove_from_remote_followers
    remove_from_remote_affected

    @status.update(local_only: true) if options[:defederate_only]
    Rails.cache.delete("statuses/#{@status.id}")
  end

  private

  def remove_from_queued
    QueuedBoost.where(account_id: @account.id, status_id: @status.proper.id).destroy_all
    QueuedBoost.where(status_id: @status.id).destroy_all
  end

  def remove_from_self
    FeedManager.instance.unpush_from_home(@account, @status)
  end

  def remove_from_followers
    @account.followers_for_local_distribution.reorder(nil).find_each do |follower|
      FeedManager.instance.unpush_from_home(follower, @status)
    end
  end

  def remove_from_lists
    @account.lists_for_local_distribution.select(:id, :account_id).reorder(nil).find_each do |list|
      FeedManager.instance.unpush_from_list(list, @status)
    end
  end

  def remove_from_affected
    @mentions.map(&:account).select(&:local?).each do |account|
      redis.publish("timeline:#{account.id}", @payload)
    end
  end

  def remove_from_remote_affected
    # People who got mentioned in the status, or who
    # reblogged it from someone else might not follow
    # the author and wouldn't normally receive the
    # delete notification - so here, we explicitly
    # send it to them

    target_accounts = (@mentions.map(&:account).reject(&:local?) + @reblogs.map(&:account).reject(&:local?))
    target_accounts << @status.reblog.account if @status.reblog? && !@status.reblog.account.local?
    target_accounts.uniq!(&:id)

    ActivityPub::DeliveryWorker.push_bulk(target_accounts.uniq(&:preferred_inbox_url)) do |target_account|
      [signed_activity_json, @account.id, target_account.preferred_inbox_url]
    end
  end

  def remove_from_remote_followers
    ActivityPub::DeliveryWorker.push_bulk(@account.followers.inboxes) do |inbox_url|
      [signed_activity_json, @account.id, inbox_url]
    end

    relay! if relayable?
  end

  def relayable?
    @status.public_visibility?
  end

  def relay!
    ActivityPub::DeliveryWorker.push_bulk(Relay.enabled.pluck(:inbox_url)) do |inbox_url|
      [signed_activity_json, @account.id, inbox_url]
    end
  end

  def signed_activity_json
    @signed_activity_json ||= Oj.dump(serialize_payload(@status, @status.reblog? ? ActivityPub::UndoAnnounceSerializer : ActivityPub::DeleteSerializer, signer: @account))
  end

  def remove_reblogs
    # We delete reblogs of the status before the original status,
    # because once original status is gone, reblogs will disappear
    # without us being able to do all the fancy stuff

    @reblogs.each do |reblog|
      RemoveStatusService.new.call(reblog, original_removed: true)
    end
  end

  def remove_from_hashtags
    @account.featured_tags.where(tag_id: @status.tags.pluck(:id)).each do |featured_tag|
      featured_tag.decrement(@status.id)
    end

    return unless @status.distributable?

    @tags.each do |hashtag|
      redis.publish("timeline:hashtag:#{hashtag}", @payload)
      redis.publish("timeline:hashtag:#{hashtag}:local", @payload) if @status.local?
    end
  end

  def remove_from_public
    return unless @status.distributable?

    redis.publish('timeline:public', @payload)
    redis.publish('timeline:public:local', @payload) if @status.local?
  end

  def remove_from_media
    return unless @status.distributable?

    redis.publish('timeline:public:media', @payload)
    redis.publish('timeline:public:local:media', @payload) if @status.local?
  end

  def remove_from_direct
    @mentions.each do |mention|
      Redis.current.publish("timeline:direct:#{mention.account.id}", @payload) if mention.account.local?
    end
    Redis.current.publish("timeline:direct:#{@account.id}", @payload) if @account.local?
  end

  def remove_media
    return if @options[:redraft]

    @status.media_attachments.destroy_all
  end

  def remove_from_spam_check
    redis.zremrangebyscore("spam_check:#{@status.account_id}", @status.id, @status.id)
  end

  def lock_options
    { redis: Redis.current, key: "distribute:#{@status.id}" }
  end
end