app/services/delete_account_service.rb
# frozen_string_literal: true
class DeleteAccountService < BaseService
include Payloadable
ASSOCIATIONS_ON_SUSPEND = %w(
account_notes
account_pins
active_relationships
aliases
block_relationships
blocked_by_relationships
conversation_mutes
conversations
custom_filters
devices
domain_blocks
featured_tags
follow_requests
list_accounts
migrations
mute_relationships
muted_by_relationships
notifications
owned_lists
passive_relationships
report_notes
scheduled_statuses
status_pins
).freeze
# The following associations have no important side-effects
# in callbacks and all of their own associations are secured
# by foreign keys, making them safe to delete without loading
# into memory
ASSOCIATIONS_WITHOUT_SIDE_EFFECTS = %w(
account_notes
account_pins
aliases
conversation_mutes
conversations
custom_filters
devices
domain_blocks
featured_tags
follow_requests
list_accounts
migrations
mute_relationships
muted_by_relationships
notifications
owned_lists
scheduled_statuses
status_pins
)
ASSOCIATIONS_ON_DESTROY = %w(
reports
targeted_moderation_notes
targeted_reports
severed_relationships
remote_severed_relationships
).freeze
# Suspend or remove an account and remove as much of its data
# as possible. If it's a local account and it has not been confirmed
# or never been approved, then side effects are skipped and both
# the user and account records are removed fully. Otherwise,
# it is controlled by options.
# @param [Account]
# @param [Hash] options
# @option [Boolean] :reserve_email Keep user record. Only applicable for local accounts
# @option [Boolean] :reserve_username Keep account record
# @option [Boolean] :skip_side_effects Side effects are ActivityPub and streaming API payloads
# @option [Boolean] :skip_activitypub Skip sending ActivityPub payloads. Implied by :skip_side_effects
# @option [Time] :suspended_at Only applicable when :reserve_username is true
# @option [RelationshipSeveranceEvent] :relationship_severance_event Event used to record severed relationships not initiated by the user
def call(account, **options)
@account = account
@options = { reserve_username: true, reserve_email: true }.merge(options)
if @account.local? && @account.user_unconfirmed_or_pending?
@options[:reserve_email] = false
@options[:reserve_username] = false
@options[:skip_side_effects] = true
end
@options[:skip_activitypub] = true if @options[:skip_side_effects]
record_severed_relationships!
distribute_activities!
purge_content!
fulfill_deletion_request!
end
private
def distribute_activities!
return if skip_activitypub?
if @account.local?
delete_actor!
elsif @account.activitypub?
reject_follows!
undo_follows!
end
end
def reject_follows!
# When deleting a remote account, the account obviously doesn't
# actually become deleted on its origin server, i.e. unlike a
# locally deleted account it continues to have access to its home
# feed and other content. To prevent it from being able to continue
# to access toots it would receive because it follows local accounts,
# we have to force it to unfollow them.
ActivityPub::DeliveryWorker.push_bulk(Follow.where(account: @account)) do |follow|
[Oj.dump(serialize_payload(follow, ActivityPub::RejectFollowSerializer)), follow.target_account_id, @account.inbox_url]
end
end
def undo_follows!
# When deleting a remote account, the account obviously doesn't
# actually become deleted on its origin server, but following relationships
# are severed on our end. Therefore, make the remote server aware that the
# follow relationships are severed to avoid confusion and potential issues
# if the remote account gets un-suspended.
ActivityPub::DeliveryWorker.push_bulk(Follow.where(target_account: @account)) do |follow|
[Oj.dump(serialize_payload(follow, ActivityPub::UndoFollowSerializer)), follow.account_id, @account.inbox_url]
end
end
def purge_user!
return if !@account.local? || @account.user.nil?
if keep_user_record?
@account.user.disable!
@account.user.invites.where(uses: 0).destroy_all
else
@account.user.destroy
end
end
def purge_content!
purge_user!
purge_profile!
purge_statuses!
purge_mentions!
purge_media_attachments!
purge_polls!
purge_generated_notifications!
purge_favourites!
purge_bookmarks!
purge_feeds!
purge_other_associations!
@account.destroy unless keep_account_record?
end
def purge_statuses!
@account.statuses.reorder(nil).where.not(id: reported_status_ids).in_batches do |statuses|
BatchedRemoveStatusService.new.call(statuses, skip_side_effects: skip_side_effects?)
end
end
def purge_mentions!
@account.mentions.reorder(nil).where.not(status_id: reported_status_ids).in_batches.delete_all
end
def purge_media_attachments!
@account.media_attachments.find_each do |media_attachment|
next if keep_account_record? && reported_status_ids.include?(media_attachment.status_id)
media_attachment.destroy
end
end
def purge_polls!
@account.polls.reorder(nil).where.not(status_id: reported_status_ids).in_batches.delete_all
end
def purge_generated_notifications!
# By deleting polls and statuses without callbacks, we've left behind
# polymorphically associated notifications generated by this account
Notification.where(from_account: @account).in_batches.delete_all
NotificationRequest.where(from_account: @account).in_batches.delete_all
end
def purge_favourites!
@account.favourites.in_batches do |favourites|
ids = favourites.pluck(:status_id)
StatusStat.where(status_id: ids).update_all('favourites_count = GREATEST(0, favourites_count - 1)')
Chewy.strategy.current.update(StatusesIndex, ids) if Chewy.enabled?
Rails.cache.delete_multi(ids.map { |id| "statuses/#{id}" })
favourites.delete_all
end
end
def purge_bookmarks!
@account.bookmarks.in_batches do |bookmarks|
Chewy.strategy.current.update(StatusesIndex, bookmarks.pluck(:status_id)) if Chewy.enabled?
bookmarks.delete_all
end
end
def purge_other_associations!
associations_for_destruction.each do |association_name|
purge_association(association_name)
end
end
def purge_feeds!
return unless @account.local?
FeedManager.instance.clean_feeds!(:home, [@account.id])
FeedManager.instance.clean_feeds!(:list, @account.owned_lists.pluck(:id))
end
def purge_profile!
# If the account is going to be destroyed
# there is no point wasting time updating
# its values first
return unless keep_account_record?
@account.silenced_at = nil
@account.suspended_at = @options[:suspended_at] || Time.now.utc
@account.suspension_origin = :local
@account.locked = false
@account.memorial = false
@account.discoverable = false
@account.trendable = false
@account.display_name = ''
@account.note = ''
@account.fields = []
@account.statuses_count = 0
@account.followers_count = 0
@account.following_count = 0
@account.moved_to_account = nil
@account.reviewed_at = nil
@account.requested_review_at = nil
@account.also_known_as = []
@account.avatar.destroy
@account.header.destroy
@account.save!
end
def fulfill_deletion_request!
@account.deletion_request&.destroy
end
def purge_association(association_name)
association = @account.public_send(association_name)
if ASSOCIATIONS_WITHOUT_SIDE_EFFECTS.include?(association_name)
association.in_batches.delete_all
else
association.in_batches.destroy_all
end
end
def delete_actor!
ActivityPub::DeliveryWorker.push_bulk(delivery_inboxes, limit: 1_000) do |inbox_url|
[delete_actor_json, @account.id, inbox_url]
end
ActivityPub::LowPriorityDeliveryWorker.push_bulk(low_priority_delivery_inboxes, limit: 1_000) do |inbox_url|
[delete_actor_json, @account.id, inbox_url]
end
end
def record_severed_relationships!
return if relationship_severance_event.nil?
@account.active_relationships.in_batches do |follows|
# NOTE: these follows are passive with regards to the local accounts
relationship_severance_event.import_from_passive_follows!(follows)
end
@account.passive_relationships.in_batches do |follows|
# NOTE: these follows are active with regards to the local accounts
relationship_severance_event.import_from_active_follows!(follows)
end
end
def delete_actor_json
@delete_actor_json ||= Oj.dump(serialize_payload(@account, ActivityPub::DeleteActorSerializer, signer: @account, always_sign: true))
end
def delivery_inboxes
@delivery_inboxes ||= @account.followers.inboxes + Relay.enabled.pluck(:inbox_url)
end
def low_priority_delivery_inboxes
Account.inboxes - delivery_inboxes
end
def reported_status_ids
@reported_status_ids ||= Report.where(target_account: @account).unresolved.pluck(:status_ids).flatten.uniq
end
def associations_for_destruction
if keep_account_record?
ASSOCIATIONS_ON_SUSPEND
else
ASSOCIATIONS_ON_SUSPEND + ASSOCIATIONS_ON_DESTROY
end
end
def keep_user_record?
@options[:reserve_email]
end
def keep_account_record?
@options[:reserve_username]
end
def skip_side_effects?
@options[:skip_side_effects]
end
def skip_activitypub?
@options[:skip_activitypub]
end
def relationship_severance_event
@options[:relationship_severance_event]
end
end