Class: PostDestroyer

Inherits:
Object
  • Object
show all
Defined in:
lib/post_destroyer.rb

Overview

How a post is deleted is affected by who is performing the action. this class contains the logic to delete it.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(user, post, opts = {}) ⇒ PostDestroyer

Returns a new instance of PostDestroyer.



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# File 'lib/post_destroyer.rb', line 55

def initialize(user, post, opts = {})
  @user = user
  @post = post
  @topic = post.topic || Topic.with_deleted.find_by(id: @post.topic_id)
  @opts = opts
end

Class Method Details

.delete_with_replies(performed_by, post, reviewable = nil, defer_reply_flags: true) ⇒ Object 



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# File 'lib/post_destroyer.rb', line 43

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

.destroy_old_hidden_posts ⇒ Object 



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# File 'lib/post_destroyer.rb', line 8

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

.destroy_stubs ⇒ Object 



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# File 'lib/post_destroyer.rb', line 15

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

Instance Method Details

#destroy ⇒ Object 



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# File 'lib/post_destroyer.rb', line 62

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

#mark_for_deletion(delete_removed_posts_after = SiteSetting.delete_removed_posts_after) ⇒ Object

When a user ‘deletes’ their own post. We just change the text.



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# File 'lib/post_destroyer.rb', line 242

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

#perform_delete ⇒ Object

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.



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# File 'lib/post_destroyer.rb', line 166

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
      make_previous_post_the_last_one
      mark_topic_changed
      clear_user_posted_flag
    end

    Topic.reset_highest(@post.topic_id)
    trash_public_post_actions
    trash_revisions
    
    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
    update_associated_category_latest_topic
    update_user_counts if !permanent?
    TopicUser.update_post_action_cache(post_id: @post.id)

    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
    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

#permanent? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/post_destroyer.rb', line 236

def permanent?
  @opts[:force_destroy] ||
    (@opts[:permanent] && @user == @post.user && @post.topic.private_message?)
end

#recover ⇒ Object 



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# File 'lib/post_destroyer.rb', line 99

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

#staff_recovered ⇒ Object 



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# File 'lib/post_destroyer.rb', line 134

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

#user_recovered ⇒ Object 



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# File 'lib/post_destroyer.rb', line 269

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