discourse/lib/post_destroyer.rb

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# frozen_string_literal: true
#
# How a post is deleted is affected by who is performing the action.
# this class contains the logic to delete it.
#
class PostDestroyer
def self.destroy_old_hidden_posts
Post
.where(deleted_at: nil, hidden: true)
.where("hidden_at < ?", 30.days.ago)
.find_each { |post| PostDestroyer.new(Discourse.system_user, post).destroy }
end
def self.destroy_stubs
context = I18n.t("remove_posts_deleted_by_author")
# exclude deleted topics and posts that are actively flagged
Post
.where(deleted_at: nil, user_deleted: true)
.where(
"NOT EXISTS (
SELECT 1 FROM topics t
WHERE t.deleted_at IS NOT NULL AND
t.id = posts.topic_id
)",
)
.where("updated_at < ?", SiteSetting.delete_removed_posts_after.hours.ago)
.where(
"NOT EXISTS (
SELECT 1
FROM post_actions pa
WHERE pa.post_id = posts.id
AND pa.deleted_at IS NULL
AND pa.deferred_at IS NULL
AND pa.post_action_type_id IN (?)
)",
PostActionType.notify_flag_type_ids,
)
.find_each { |post| PostDestroyer.new(Discourse.system_user, post, context: context).destroy }
end
def self.delete_with_replies(performed_by, post, reviewable = nil, defer_reply_flags: true)
reply_ids = post.reply_ids(Guardian.new(performed_by), only_replies_to_single_post: false)
replies = Post.where(id: reply_ids.map { |r| r[:id] })
PostDestroyer.new(performed_by, post, reviewable: reviewable).destroy
options = { defer_flags: defer_reply_flags }
if SiteSetting.notify_users_after_responses_deleted_on_flagged_post
options.merge!({ reviewable: reviewable, notify_responders: true, parent_post: post })
end
replies.each { |reply| PostDestroyer.new(performed_by, reply, options).destroy }
end
def initialize(user, post, opts = {})
@user = user
@post = post
@topic = post.topic || Topic.with_deleted.find_by(id: @post.topic_id)
@opts = opts
end
def destroy
payload = WebHook.generate_payload(:post, @post) if WebHook.active_web_hooks(:post).exists?
is_first_post = @post.is_first_post? && @topic
has_topic_web_hooks = is_first_post && WebHook.active_web_hooks(:topic).exists?
if has_topic_web_hooks
topic_view = TopicView.new(@topic.id, Discourse.system_user, skip_staff_action: true)
topic_payload = WebHook.generate_payload(:topic, topic_view, WebHookTopicViewSerializer)
end
delete_removed_posts_after =
@opts[:delete_removed_posts_after] || SiteSetting.delete_removed_posts_after
if delete_removed_posts_after < 1 || post_is_reviewable? ||
Guardian.new(@user).can_moderate_topic?(@topic) || permanent?
perform_delete
elsif @user.id == @post.user_id
mark_for_deletion(delete_removed_posts_after)
end
UserActionManager.post_destroyed(@post)
DiscourseEvent.trigger(:post_destroyed, @post, @opts, @user)
WebHook.enqueue_post_hooks(:post_destroyed, @post, payload)
Jobs.enqueue(:sync_topic_user_bookmarked, topic_id: @topic.id) if @topic
if is_first_post
UserProfile.remove_featured_topic_from_all_profiles(@topic)
UserActionManager.topic_destroyed(@topic)
DiscourseEvent.trigger(:topic_destroyed, @topic, @user)
WebHook.enqueue_topic_hooks(:topic_destroyed, @topic, topic_payload) if has_topic_web_hooks
if SiteSetting.tos_topic_id == @topic.id || SiteSetting.privacy_topic_id == @topic.id
Discourse.clear_urls!
end
end
end
def recover
if (post_is_reviewable? || Guardian.new(@user).can_moderate_topic?(@post.topic)) &&
@post.deleted_at
staff_recovered
elsif @user.staff? || @user.id == @post.user_id
user_recovered
end
@topic.update_column(:user_id, Discourse::SYSTEM_USER_ID) if !@topic.user_id
@topic.recover!(@user) if @post.is_first_post?
@topic.update_statistics
Topic.publish_stats_to_clients!(@topic.id, :recovered)
UserActionManager.post_created(@post)
DiscourseEvent.trigger(:post_recovered, @post, @opts, @user)
Jobs.enqueue(:sync_topic_user_bookmarked, topic_id: @topic.id) if @topic
Jobs.enqueue(:notify_mailing_list_subscribers, post_id: @post.id)
if @post.is_first_post?
UserActionManager.topic_created(@topic)
DiscourseEvent.trigger(:topic_recovered, @topic, @user)
if @user.id != @post.user_id
StaffActionLogger.new(@user).log_topic_delete_recover(
@topic,
"recover_topic",
@opts.slice(:context),
)
end
update_imap_sync(@post, false)
if SiteSetting.tos_topic_id == @topic.id || SiteSetting.privacy_topic_id == @topic.id
Discourse.clear_urls!
end
end
end
def staff_recovered
new_post_attrs = { user_deleted: false }
new_post_attrs[:user_id] = Discourse::SYSTEM_USER_ID if !@post.user_id
@post.update_columns(new_post_attrs)
@post.recover!
mark_topic_changed
if @post.topic && !@post.topic.private_message?
if author = @post.user
if @post.is_first_post?
author.user_stat.topic_count += 1
else
author.user_stat.post_count += 1
end
author.user_stat.save!
end
if @post.is_first_post?
# Update stats of all people who replied
update_post_counts(:increment)
end
end
# skip also publishing topic stats because they weren't updated yet
@post.publish_change_to_clients! :recovered, { skip_topic_stats: true }
TopicTrackingState.publish_recover(@post.topic) if @post.topic && @post.is_first_post?
end
# When a post is properly deleted. Well, it's still soft deleted, but it will no longer
# show up in the topic
# Permanent option allows to hard delete.
def perform_delete
# All posts in the topic must be force deleted if the first is force
# deleted (except @post which is destroyed by current instance).
if @topic && @post.is_first_post? && permanent?
@topic.ordered_posts.with_deleted.reverse_order.find_each do |post|
PostDestroyer.new(@user, post, @opts).destroy if post.id != @post.id
end
end
Post.transaction do
permanent? ? @post.destroy! : @post.trash!(@user)
if @post.topic
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make_previous_post_the_last_one
mark_topic_changed
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clear_user_posted_flag
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end
Topic.reset_highest(@post.topic_id)
trash_public_post_actions
trash_revisions
trash_user_actions
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remove_associated_replies
remove_associated_notifications
if @user.id != @post.user_id && !@opts[:skip_staff_log]
if @post.topic && @post.is_first_post?
StaffActionLogger.new(@user).log_topic_delete_recover(
@post.topic,
"delete_topic",
@opts.slice(:context),
)
else
StaffActionLogger.new(@user).log_post_deletion(@post, @opts.slice(:context))
end
end
if @topic && @post.is_first_post?
permanent? ? @topic.destroy! : @topic.trash!(@user)
PublishedPage.unpublish!(@user, @topic) if @topic.published_page
end
TopicLink.where(link_post_id: @post.id).destroy_all
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update_associated_category_latest_topic
update_user_counts if !permanent?
TopicUser.update_post_action_cache(post_id: @post.id)
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DB.after_commit do
if @opts[:reviewable]
notify_deletion(
@opts[:reviewable],
{ notify_responders: @opts[:notify_responders], parent_post: @opts[:parent_post] },
)
if @post.reviewable_flag &&
SiteSetting.notify_users_after_responses_deleted_on_flagged_post
ignore(@post.reviewable_flag)
end
elsif reviewable = @post.reviewable_flag
@opts[:defer_flags] ? ignore(reviewable) : agree(reviewable)
end
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end
end
update_imap_sync(@post, true) if @post.topic&.deleted_at
feature_users_in_the_topic if @post.topic
@post.publish_change_to_clients!(permanent? ? :destroyed : :deleted) if @post.topic
if @post.topic && @post.post_number == 1
TopicTrackingState.send(permanent? ? :publish_destroy : :publish_delete, @post.topic)
end
end
def permanent?
@opts[:force_destroy] ||
(@opts[:permanent] && @user == @post.user && @post.topic.private_message?)
end
# When a user 'deletes' their own post. We just change the text.
def mark_for_deletion(delete_removed_posts_after = SiteSetting.delete_removed_posts_after)
I18n.with_locale(SiteSetting.default_locale) do
# don't call revise from within transaction, high risk of deadlock
key =
(
if @post.is_first_post?
"js.topic.deleted_by_author_simple"
else
"js.post.deleted_by_author_simple"
end
)
@post.revise(
@user,
{ raw: I18n.t(key) },
force_new_version: true,
deleting_post: true,
skip_validations: true,
)
Post.transaction do
@post.update_column(:user_deleted, true)
@post.topic_links.each(&:destroy)
@post.topic.update_column(:closed, true) if @post.is_first_post?
end
end
end
def user_recovered
return unless @post.user_deleted?
Post.transaction do
@post.update_column(:user_deleted, false)
@post.skip_unique_check = true
@post.topic.update_column(:closed, false) if @post.is_first_post?
end
# has internal transactions, if we nest then there are some very high risk deadlocks
last_revision = @post.revisions.last
if last_revision.present? && last_revision.modifications["raw"].present?
@post.revise(@user, { raw: last_revision.modifications["raw"][0] }, force_new_version: true)
end
end
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private
def post_is_reviewable?
return true if @user.staff?
Guardian.new(@user).can_review_topic?(@topic) && Reviewable.exists?(target: @post)
end
# we need topics to change if ever a post in them is deleted or created
# this ensures users relying on this information can keep unread tracking
# working as desired
def mark_topic_changed
# make this as fast as possible, can bypass everything
DB.exec(<<~SQL, updated_at: Time.now, id: @post.topic_id)
UPDATE topics
SET updated_at = :updated_at
WHERE id = :id
SQL
end
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def make_previous_post_the_last_one
last_post =
Post
.select(:created_at, :user_id, :post_number)
.where("topic_id = ? and id <> ?", @post.topic_id, @post.id)
.where.not(user_id: nil)
.where.not(post_type: Post.types[:whisper])
.order("created_at desc")
.first
if last_post.present?
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topic = @post.topic
topic.last_posted_at = last_post.created_at
topic.last_post_user_id = last_post.user_id
topic.highest_post_number = last_post.post_number
# we go via save here cause we need to run hooks
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topic.save!(validate: false)
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end
end
def clear_user_posted_flag
unless Post.exists?(
["topic_id = ? and user_id = ? and id <> ?", @post.topic_id, @post.user_id, @post.id],
)
TopicUser.where(topic_id: @post.topic_id, user_id: @post.user_id).update_all "posted = false"
end
end
def feature_users_in_the_topic
Jobs.enqueue(:feature_topic_users, topic_id: @post.topic_id)
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end
def trash_public_post_actions
if public_post_actions = PostAction.publics.where(post_id: @post.id)
public_post_actions.each { |pa| permanent? ? pa.destroy! : pa.trash!(@user) }
return if permanent?
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@post.custom_fields["deleted_public_actions"] = public_post_actions.ids
@post.save_custom_fields
f = PostActionType.public_types.map { |k, _| ["#{k}_count", 0] }
Post.with_deleted.where(id: @post.id).update_all(Hash[*f.flatten])
end
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end
def trash_revisions
return unless permanent?
@post.revisions.each(&:destroy!)
end
def agree(reviewable)
notify_deletion(reviewable)
result = reviewable.perform(@user, :agree_and_keep, post_was_deleted: true)
reviewable.transition_to(result.transition_to, @user)
end
def ignore(reviewable)
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reviewable.perform_ignore_and_do_nothing(@user, post_was_deleted: true)
reviewable.transition_to(:ignored, @user)
end
def notify_deletion(reviewable, options = {})
return if @post.user.blank?
allowed_user = @user.human? && @user.staff?
return unless allowed_user && rs = reviewable.reviewable_scores.order("created_at DESC").first
# ReviewableScore#types is a superset of PostActionType#flag_types.
# If the reviewable score type is not on the latter, it means it's not a flag by a user and
# must be an automated flag like `needs_approval`. There's no flag reason for these kind of types.
flag_type = PostActionType.flag_types[rs.reviewable_score_type]
return unless flag_type
notify_responders = options[:notify_responders]
Jobs.enqueue(
:send_system_message,
user_id: @post.user_id,
message_type:
(
if notify_responders
"flags_agreed_and_post_deleted_for_responders"
else
"flags_agreed_and_post_deleted"
end
),
message_options: {
flagged_post_raw_content: notify_responders ? options[:parent_post].raw : @post.raw,
flagged_post_response_raw_content: @post.raw,
url: notify_responders ? options[:parent_post].url : @post.url,
flag_reason:
I18n.t(
"flag_reasons#{".responder" if notify_responders}.#{flag_type}",
locale: SiteSetting.default_locale,
base_path: Discourse.base_path,
),
},
)
end
def trash_user_actions
UserAction
.where(target_post_id: @post.id)
.each do |ua|
row = {
action_type: ua.action_type,
user_id: ua.user_id,
acting_user_id: ua.acting_user_id,
target_topic_id: ua.target_topic_id,
target_post_id: ua.target_post_id,
}
UserAction.remove_action!(row)
end
end
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def remove_associated_replies
post_ids = PostReply.where(reply_post_id: @post.id).pluck(:post_id)
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if post_ids.present?
PostReply.where(reply_post_id: @post.id).delete_all
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Post.where(id: post_ids).each { |p| p.update_column :reply_count, p.replies.count }
end
end
def remove_associated_notifications
Notification.where(topic_id: @post.topic_id, post_number: @post.post_number).delete_all
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end
def update_associated_category_latest_topic
return unless @post.topic && @post.topic.category
if @post.id != @post.topic.category.latest_post_id &&
!(@post.is_first_post? && @post.topic_id == @post.topic.category.latest_topic_id)
return
end
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@post.topic.category.update_latest
end
def update_user_counts
author = @post.user
return unless author
author.create_user_stat if author.user_stat.nil?
if @post.created_at == author.user_stat.first_post_created_at
author.user_stat.update!(
first_post_created_at: author.posts.order("created_at ASC").first.try(:created_at),
)
end
UserStatCountUpdater.decrement!(@post)
if @post.created_at == author.last_posted_at
author.update_column(
:last_posted_at,
author.posts.order("created_at DESC").first.try(:created_at),
)
end
if @post.is_first_post? && @post.topic && !@post.topic.private_message?
# Update stats of all people who replied
update_post_counts(:decrement)
end
end
def update_imap_sync(post, sync)
return if !SiteSetting.enable_imap
incoming = IncomingEmail.find_by(post_id: post.id, topic_id: post.topic_id)
return if !incoming || !incoming.imap_uid
incoming.update(imap_sync: sync)
end
def update_post_counts(operator)
counts =
Post
.where(post_type: Post.types[:regular], topic_id: @post.topic_id)
.where("post_number > 1")
.group(:user_id)
.count
counts.each do |user_id, count|
if user_stat = UserStat.where(user_id: user_id).first
if operator == :decrement
UserStatCountUpdater.set!(
user_stat: user_stat,
count: user_stat.post_count - count,
count_column: :post_count,
)
else
UserStatCountUpdater.set!(
user_stat: user_stat,
count: user_stat.post_count + count,
count_column: :post_count,
)
end
end
end
end
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end