discourse/lib/post_destroyer.rb

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#
# 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)
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.where("hidden_at < ?", 30.days.ago)
.find_each do |post|
PostDestroyer.new(Discourse.system_user, post).destroy
end
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)
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.where("NOT EXISTS (
SELECT 1 FROM topics t
WHERE t.deleted_at IS NOT NULL AND
t.id = posts.topic_id
)")
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.where("updated_at < ? AND post_number > 1", 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)
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.find_each do |post|
PostDestroyer.new(Discourse.system_user, post, context: context).destroy
end
end
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def initialize(user, post, opts = {})
@user = user
@post = post
@topic = post.topic if post
@opts = opts
end
def destroy
payload = WebHook.generate_payload(:post, @post) if WebHook.active_web_hooks(:post).exists?
topic = @post.topic
if @post.is_first_post? && topic
topic_view = TopicView.new(topic.id, Discourse.system_user)
topic_payload = WebHook.generate_payload(:topic, topic_view, WebHookTopicViewSerializer) if WebHook.active_web_hooks(:topic).exists?
end
delete_removed_posts_after = @opts[:delete_removed_posts_after] || SiteSetting.delete_removed_posts_after
if @user.staff? || delete_removed_posts_after < 1
perform_delete
elsif @user.id == @post.user_id
mark_for_deletion(delete_removed_posts_after)
end
DiscourseEvent.trigger(:post_destroyed, @post, @opts, @user)
WebHook.enqueue_hooks(:post, :post_destroyed,
id: @post.id,
category_id: @post&.topic&.category_id,
payload: payload
) if WebHook.active_web_hooks(:post).exists?
if @post.is_first_post? && @post.topic
DiscourseEvent.trigger(:topic_destroyed, @post.topic, @user)
WebHook.enqueue_hooks(:topic, :topic_destroyed,
id: topic.id,
category_id: topic&.category_id,
payload: topic_payload
) if WebHook.active_web_hooks(:topic).exists?
end
end
def recover
if @user.staff? && @post.deleted_at
staff_recovered
elsif @user.staff? || @user.id == @post.user_id
user_recovered
end
topic = Topic.with_deleted.find @post.topic_id
topic.recover! if @post.is_first_post?
topic.update_statistics
recover_user_actions
DiscourseEvent.trigger(:post_recovered, @post, @opts, @user)
if @post.is_first_post?
DiscourseEvent.trigger(:topic_recovered, topic, @user)
StaffActionLogger.new(@user).log_topic_delete_recover(topic, "recover_topic", @opts.slice(:context)) if @user.id != @post.user_id
end
end
def staff_recovered
@post.recover!
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
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
user_stat.update_attributes(post_count: user_stat.post_count + count)
end
end
end
end
@post.publish_change_to_clients! :recovered
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
def perform_delete
Post.transaction do
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@post.trash!(@user)
if @post.topic
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make_previous_post_the_last_one
clear_user_posted_flag
Topic.reset_highest(@post.topic_id)
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end
trash_public_post_actions
trash_user_actions
@post.update_flagged_posts_count
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remove_associated_replies
remove_associated_notifications
if @post.topic && @post.is_first_post?
StaffActionLogger.new(@user).log_topic_delete_recover(@post.topic, "delete_topic", @opts.slice(:context)) if @user.id != @post.user_id
@post.topic.trash!(@user)
elsif @user.id != @post.user_id
StaffActionLogger.new(@user).log_post_deletion(@post, @opts.slice(:context))
end
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update_associated_category_latest_topic
update_user_counts
TopicUser.update_post_action_cache(post_id: @post.id)
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DB.after_commit do
if @opts[:defer_flags].to_s == "true"
defer_flags
else
agree_with_flags
end
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end
end
feature_users_in_the_topic if @post.topic
@post.publish_change_to_clients! :deleted if @post.topic
TopicTrackingState.publish_delete(@post.topic) if @post.topic && @post.post_number == 1
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
@post.revise(@user,
{ raw: I18n.t('js.post.deleted_by_author', count: delete_removed_posts_after) },
force_new_version: true
)
Post.transaction do
@post.update_column(:user_deleted, true)
@post.update_flagged_posts_count
@post.topic_links.each(&:destroy)
end
end
end
def user_recovered
Post.transaction do
@post.update_column(:user_deleted, false)
@post.skip_unique_check = true
@post.update_flagged_posts_count
end
# has internal transactions, if we nest then there are some very high risk deadlocks
last_revision = @post.revisions.last
@post.revise(@user, { raw: last_revision.modifications["raw"][0] }, force_new_version: true) if last_revision.present?
end
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private
def make_previous_post_the_last_one
last_post = Post.where("topic_id = ? and id <> ?", @post.topic_id, @post.id).order('created_at desc').limit(1).first
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if last_post.present? && @post.topic.present?
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
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| pa.trash!(@user) }
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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 agree_with_flags
if @post.has_active_flag? && @user.human? && @user.staff?
Jobs.enqueue(
:send_system_message,
user_id: @post.user_id,
message_type: :flags_agreed_and_post_deleted,
message_options: {
flagged_post_raw_content: @post.raw,
url: @post.url,
flag_reason: I18n.t(
"flag_reasons.#{@post.active_flags.last.post_action_type.name_key}",
locale: SiteSetting.default_locale,
base_path: Discourse.base_path
)
}
)
end
PostAction.agree_flags!(@post, @user, delete_post: true)
end
def defer_flags
PostAction.defer_flags!(@post, @user, delete_post: true)
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
def recover_user_actions
# TODO: Use a trash concept for `user_actions` to avoid churn and simplify this?
UserActionCreator.log_post(@post)
end
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def remove_associated_replies
post_ids = PostReply.where(reply_id: @post.id).pluck(:post_id)
if post_ids.present?
PostReply.where(reply_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
return unless @post.id == @post.topic.category.latest_post_id || (@post.is_first_post? && @post.topic_id == @post.topic.category.latest_topic_id)
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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.first_post_created_at = author.posts.order('created_at ASC').first.try(:created_at)
end
if @post.topic && !@post.topic.private_message?
if @post.post_type == Post.types[:regular] && !@post.is_first_post? && !@topic.nil?
author.user_stat.post_count -= 1
end
author.user_stat.topic_count -= 1 if @post.is_first_post?
end
# We don't count replies to your own topics in topic_reply_count
if @topic && author.id != @topic.user_id
author.user_stat.update_topic_reply_count
end
author.user_stat.save!
if @post.created_at == author.last_posted_at
author.last_posted_at = author.posts.order('created_at DESC').first.try(:created_at)
author.save!
end
if @post.is_first_post? && @post.topic && !@post.topic.private_message?
# Update stats of all people who replied
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
user_stat.update_attributes(post_count: user_stat.post_count - count)
end
end
end
end
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end