465 lines
16 KiB
Ruby
465 lines
16 KiB
Ruby
require_dependency 'rate_limiter'
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require_dependency 'system_message'
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class PostAction < ActiveRecord::Base
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class AlreadyActed < StandardError; end
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include RateLimiter::OnCreateRecord
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include Trashable
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belongs_to :post
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belongs_to :user
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belongs_to :post_action_type
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belongs_to :related_post, class_name: 'Post'
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belongs_to :target_user, class_name: 'User'
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rate_limit :post_action_rate_limiter
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scope :spam_flags, -> { where(post_action_type_id: PostActionType.types[:spam]) }
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scope :flags, -> { where(post_action_type_id: PostActionType.notify_flag_type_ids) }
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scope :publics, -> { where(post_action_type_id: PostActionType.public_type_ids) }
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scope :active, -> { where(disagreed_at: nil, deferred_at: nil, agreed_at: nil, deleted_at: nil) }
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after_save :update_counters
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after_save :enforce_rules
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after_commit :notify_subscribers
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def disposed_by_id
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disagreed_by_id || agreed_by_id || deferred_by_id
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end
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def disposed_at
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disagreed_at || agreed_at || deferred_at
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end
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def disposition
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return :disagreed if disagreed_at
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return :agreed if agreed_at
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return :deferred if deferred_at
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nil
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end
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def self.update_flagged_posts_count
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posts_flagged_count = PostAction.active
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.flags
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.joins(post: :topic)
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.where('posts.deleted_at' => nil)
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.where('topics.deleted_at' => nil)
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.count('DISTINCT posts.id')
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$redis.set('posts_flagged_count', posts_flagged_count)
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user_ids = User.staff.pluck(:id)
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MessageBus.publish('/flagged_counts', { total: posts_flagged_count }, { user_ids: user_ids })
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end
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def self.flagged_posts_count
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$redis.get('posts_flagged_count').to_i
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end
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def self.counts_for(collection, user)
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return {} if collection.blank?
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collection_ids = collection.map(&:id)
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user_id = user.try(:id) || 0
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post_actions = PostAction.where(post_id: collection_ids, user_id: user_id)
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user_actions = {}
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post_actions.each do |post_action|
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user_actions[post_action.post_id] ||= {}
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user_actions[post_action.post_id][post_action.post_action_type_id] = post_action
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end
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user_actions
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end
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def self.active_flags_counts_for(collection)
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return {} if collection.blank?
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collection_ids = collection.map(&:id)
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post_actions = PostAction.active.flags.where(post_id: collection_ids)
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user_actions = {}
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post_actions.each do |post_action|
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user_actions[post_action.post_id] ||= {}
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user_actions[post_action.post_id][post_action.post_action_type_id] ||= []
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user_actions[post_action.post_id][post_action.post_action_type_id] << post_action
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end
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user_actions
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end
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def self.count_per_day_for_type(post_action_type, since_days_ago=30)
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unscoped.where(post_action_type_id: post_action_type)
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.where('created_at > ?', since_days_ago.days.ago)
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.group('date(created_at)')
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.order('date(created_at)')
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.count
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end
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def self.agree_flags!(post, moderator, delete_post=false)
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actions = PostAction.active
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.where(post_id: post.id)
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.where(post_action_type_id: PostActionType.flag_types.values)
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actions.each do |action|
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action.agreed_at = Time.zone.now
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action.agreed_by_id = moderator.id
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# so callback is called
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action.save
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action.add_moderator_post_if_needed(moderator, :agreed, delete_post)
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end
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update_flagged_posts_count
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end
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def self.clear_flags!(post, moderator)
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# -1 is the automatic system cleary
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action_type_ids = moderator.id == -1 ?
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PostActionType.auto_action_flag_types.values :
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PostActionType.flag_types.values
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actions = PostAction.where(post_id: post.id)
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.where(post_action_type_id: action_type_ids)
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actions.each do |action|
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action.disagreed_at = Time.zone.now
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action.disagreed_by_id = moderator.id
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# so callback is called
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action.save
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action.add_moderator_post_if_needed(moderator, :disagreed)
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end
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# reset all cached counters
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f = action_type_ids.map { |t| ["#{PostActionType.types[t]}_count", 0] }
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Post.with_deleted.where(id: post.id).update_all(Hash[*f.flatten])
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update_flagged_posts_count
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end
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def self.defer_flags!(post, moderator, delete_post=false)
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actions = PostAction.active
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.where(post_id: post.id)
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.where(post_action_type_id: PostActionType.flag_types.values)
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actions.each do |action|
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action.deferred_at = Time.zone.now
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action.deferred_by_id = moderator.id
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# so callback is called
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action.save
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action.add_moderator_post_if_needed(moderator, :deferred, delete_post)
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end
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update_flagged_posts_count
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end
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def add_moderator_post_if_needed(moderator, disposition, delete_post=false)
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return if related_post.nil?
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return if moderator_already_replied?(related_post.topic, moderator)
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message_key = "flags_dispositions.#{disposition}"
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message_key << "_and_deleted" if delete_post
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related_post.topic.add_moderator_post(moderator, I18n.t(message_key))
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end
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def moderator_already_replied?(topic, moderator)
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topic.posts
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.where("user_id = :user_id OR post_type = :post_type", user_id: moderator.id, post_type: Post.types[:moderator_action])
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.exists?
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end
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def self.create_message_for_post_action(user, post, post_action_type_id, opts)
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post_action_type = PostActionType.types[post_action_type_id]
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return unless opts[:message] && [:notify_moderators, :notify_user].include?(post_action_type)
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title = I18n.t("post_action_types.#{post_action_type}.email_title", title: post.topic.title)
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body = I18n.t("post_action_types.#{post_action_type}.email_body", message: opts[:message], link: "#{Discourse.base_url}#{post.url}")
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opts = {
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archetype: Archetype.private_message,
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title: title,
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raw: body
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}
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if post_action_type == :notify_moderators
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opts[:subtype] = TopicSubtype.notify_moderators
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opts[:target_group_names] = "moderators"
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else
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opts[:subtype] = TopicSubtype.notify_user
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opts[:target_usernames] = if post_action_type == :notify_user
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post.user.username
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elsif post_action_type != :notify_moderators
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# this is a hack to allow a PM with no recipients, we should think through
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# a cleaner technique, a PM with myself is valid for flagging
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'x'
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end
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end
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PostCreator.new(user, opts).create.id
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end
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def self.act(user, post, post_action_type_id, opts = {})
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related_post_id = create_message_for_post_action(user, post, post_action_type_id, opts)
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staff_took_action = opts[:take_action] || false
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targets_topic = if opts[:flag_topic] && post.topic
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post.topic.reload
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post.topic.posts_count != 1
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end
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where_attrs = {
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post_id: post.id,
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user_id: user.id,
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post_action_type_id: post_action_type_id
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}
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action_attributes = {
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staff_took_action: staff_took_action,
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related_post_id: related_post_id,
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targets_topic: !!targets_topic
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}
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# First try to revive a trashed record
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row_count = PostAction.where(where_attrs)
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.with_deleted
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.where("deleted_at IS NOT NULL")
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.update_all(action_attributes.merge(deleted_at: nil))
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if row_count == 0
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post_action = create(where_attrs.merge(action_attributes))
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if post_action && post_action.errors.count == 0
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BadgeGranter.queue_badge_grant(Badge::Trigger::PostAction, post_action: post_action)
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end
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else
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post_action = PostAction.where(where_attrs).first
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# after_commit is not called on an `update_all` so do the notify ourselves
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post_action.notify_subscribers
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end
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# agree with other flags
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PostAction.agree_flags!(post, user) if staff_took_action
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# update counters
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post_action.try(:update_counters)
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post_action
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rescue ActiveRecord::RecordNotUnique
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# can happen despite being .create
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# since already bookmarked
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PostAction.where(where_attrs).first
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end
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def self.remove_act(user, post, post_action_type_id)
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finder = PostAction.where(post_id: post.id, user_id: user.id, post_action_type_id: post_action_type_id)
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finder = finder.with_deleted.includes(:post) if user.try(:staff?)
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if action = finder.first
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action.remove_act!(user)
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action.post.unhide! if action.staff_took_action
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end
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end
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def remove_act!(user)
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trash!(user)
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# NOTE: save is called to ensure all callbacks are called
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# trash will not trigger callbacks, and triggering after_commit
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# is not trivial
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save
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end
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def is_bookmark?
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post_action_type_id == PostActionType.types[:bookmark]
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end
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def is_like?
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post_action_type_id == PostActionType.types[:like]
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end
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def is_flag?
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PostActionType.flag_types.values.include?(post_action_type_id)
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end
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def is_private_message?
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post_action_type_id == PostActionType.types[:notify_user] ||
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post_action_type_id == PostActionType.types[:notify_moderators]
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end
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# A custom rate limiter for this model
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def post_action_rate_limiter
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return unless is_flag? || is_bookmark? || is_like?
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return @rate_limiter if @rate_limiter.present?
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%w(like flag bookmark).each do |type|
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if send("is_#{type}?")
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@rate_limiter = RateLimiter.new(user, "create_#{type}:#{Date.today}", SiteSetting.send("max_#{type}s_per_day"), 1.day.to_i)
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return @rate_limiter
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end
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end
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end
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before_create do
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post_action_type_ids = is_flag? ? PostActionType.flag_types.values : post_action_type_id
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raise AlreadyActed if PostAction.where(user_id: user_id)
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.where(post_id: post_id)
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.where(post_action_type_id: post_action_type_ids)
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.where(deleted_at: nil)
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.where(disagreed_at: nil)
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.where(targets_topic: targets_topic)
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.exists?
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end
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# Returns the flag counts for a post, taking into account that some users
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# can weigh flags differently.
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def self.flag_counts_for(post_id)
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flag_counts = exec_sql("SELECT SUM(CASE
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WHEN pa.disagreed_at IS NULL AND pa.staff_took_action THEN :flags_required_to_hide_post
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WHEN pa.disagreed_at IS NULL AND NOT pa.staff_took_action THEN 1
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ELSE 0
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END) AS new_flags,
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SUM(CASE
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WHEN pa.disagreed_at IS NOT NULL AND pa.staff_took_action THEN :flags_required_to_hide_post
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WHEN pa.disagreed_at IS NOT NULL AND NOT pa.staff_took_action THEN 1
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ELSE 0
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END) AS old_flags
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FROM post_actions AS pa
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INNER JOIN users AS u ON u.id = pa.user_id
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WHERE pa.post_id = :post_id
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AND pa.post_action_type_id IN (:post_action_types)
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AND pa.deleted_at IS NULL",
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post_id: post_id,
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post_action_types: PostActionType.auto_action_flag_types.values,
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flags_required_to_hide_post: SiteSetting.flags_required_to_hide_post).first
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[flag_counts['old_flags'].to_i, flag_counts['new_flags'].to_i]
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end
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def post_action_type_key
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PostActionType.types[post_action_type_id]
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end
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def update_counters
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# Update denormalized counts
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column = "#{post_action_type_key}_count"
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count = PostAction.where(post_id: post_id)
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.where(post_action_type_id: post_action_type_id)
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.count
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# We probably want to refactor this method to something cleaner.
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case post_action_type_key
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when :vote
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# Voting also changes the sort_order
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Post.where(id: post_id).update_all ["vote_count = :count, sort_order = :max - :count", count: count, max: Topic.max_sort_order]
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when :like
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# `like_score` is weighted higher for staff accounts
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score = PostAction.joins(:user)
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.where(post_id: post_id)
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.sum("CASE WHEN users.moderator OR users.admin THEN #{SiteSetting.staff_like_weight} ELSE 1 END")
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Post.where(id: post_id).update_all ["like_count = :count, like_score = :score", count: count, score: score]
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else
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Post.where(id: post_id).update_all ["#{column} = ?", count]
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end
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topic_id = Post.with_deleted.where(id: post_id).pluck(:topic_id).first
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topic_count = Post.where(topic_id: topic_id).sum(column)
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Topic.where(id: topic_id).update_all ["#{column} = ?", topic_count]
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if PostActionType.notify_flag_type_ids.include?(post_action_type_id)
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PostAction.update_flagged_posts_count
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end
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end
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def enforce_rules
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post = Post.with_deleted.where(id: post_id).first
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PostAction.auto_hide_if_needed(post, post_action_type_key)
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SpamRulesEnforcer.enforce!(post.user) if post_action_type_key == :spam
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end
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def notify_subscribers
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if (is_like? || is_flag?) && post
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post.publish_change_to_clients! :acted
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end
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end
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def self.auto_hide_if_needed(post, post_action_type)
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return if post.hidden
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if PostActionType.auto_action_flag_types.include?(post_action_type) &&
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SiteSetting.flags_required_to_hide_post > 0
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old_flags, new_flags = PostAction.flag_counts_for(post.id)
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if new_flags >= SiteSetting.flags_required_to_hide_post
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hide_post!(post, post_action_type, guess_hide_reason(old_flags))
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end
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end
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end
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def self.hide_post!(post, post_action_type, reason=nil)
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return if post.hidden
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unless reason
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old_flags,_ = PostAction.flag_counts_for(post.id)
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reason = guess_hide_reason(old_flags)
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end
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Post.where(id: post.id).update_all(["hidden = true, hidden_at = CURRENT_TIMESTAMP, hidden_reason_id = COALESCE(hidden_reason_id, ?)", reason])
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Topic.where("id = :topic_id AND NOT EXISTS(SELECT 1 FROM POSTS WHERE topic_id = :topic_id AND NOT hidden)", topic_id: post.topic_id).update_all(visible: false)
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# inform user
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if post.user
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options = {
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url: post.url,
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edit_delay: SiteSetting.cooldown_minutes_after_hiding_posts,
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flag_reason: I18n.t("flag_reasons.#{post_action_type}"),
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}
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SystemMessage.create(post.user, :post_hidden, options)
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end
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end
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def self.guess_hide_reason(old_flags)
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old_flags > 0 ?
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Post.hidden_reasons[:flag_threshold_reached_again] :
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Post.hidden_reasons[:flag_threshold_reached]
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end
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def self.post_action_type_for_post(post_id)
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post_action = PostAction.find_by(deferred_at: nil, post_id: post_id, post_action_type_id: PostActionType.flag_types.values, deleted_at: nil)
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PostActionType.types[post_action.post_action_type_id]
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end
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def self.target_moderators
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Group[:moderators].name
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end
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end
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# == Schema Information
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#
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# Table name: post_actions
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#
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# id :integer not null, primary key
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# post_id :integer not null
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# user_id :integer not null
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# post_action_type_id :integer not null
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# deleted_at :datetime
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# created_at :datetime not null
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# updated_at :datetime not null
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# deleted_by_id :integer
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# related_post_id :integer
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# staff_took_action :boolean default(FALSE), not null
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# deferred_by_id :integer
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# targets_topic :boolean default(FALSE), not null
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# agreed_at :datetime
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# agreed_by_id :integer
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# deferred_at :datetime
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# disagreed_at :datetime
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# disagreed_by_id :integer
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#
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# Indexes
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#
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# idx_unique_actions (user_id,post_action_type_id,post_id,targets_topic) UNIQUE
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# index_post_actions_on_post_id (post_id)
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#
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