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require_dependency 'rate_limiter'
require_dependency 'system_message'
class PostAction < ActiveRecord::Base
class AlreadyActed < StandardError; end
class FailedToCreatePost < StandardError; end
include RateLimiter::OnCreateRecord
include Trashable
belongs_to :post
belongs_to :user
belongs_to :post_action_type
belongs_to :related_post, class_name: 'Post'
belongs_to :target_user, class_name: 'User'
rate_limit :post_action_rate_limiter
scope :spam_flags, -> { where(post_action_type_id: PostActionType.types[:spam]) }
scope :flags, -> { where(post_action_type_id: PostActionType.notify_flag_type_ids) }
scope :publics, -> { where(post_action_type_id: PostActionType.public_type_ids) }
scope :active, -> { where(disagreed_at: nil, deferred_at: nil, agreed_at: nil, deleted_at: nil) }
after_save :update_counters
after_save :enforce_rules
after_save :create_user_action
after_save :update_notifications
after_create :create_notifications
after_commit :notify_subscribers
def disposed_by_id
disagreed_by_id || agreed_by_id || deferred_by_id
end
def disposed_at
disagreed_at || agreed_at || deferred_at
end
def disposition
return :disagreed if disagreed_at
return :agreed if agreed_at
return :deferred if deferred_at
nil
end
def self.flag_count_by_date(start_date, end_date, category_id = nil)
result = where('post_actions.created_at >= ? AND post_actions.created_at <= ?', start_date, end_date)
result = result.where(post_action_type_id: PostActionType.flag_types_without_custom.values)
result = result.joins(post: :topic).where("topics.category_id = ?", category_id) if category_id
result.group('date(post_actions.created_at)')
.order('date(post_actions.created_at)')
.count
end
# Forums can choose to apply a minimum number of flags required before it shows up in
# the admin interface. One exception is posts hidden by tl3/tl4 - we want those to
# show up even if the minimum visibility is not met.
def self.apply_minimum_visibility(relation)
return relation unless SiteSetting.min_flags_staff_visibility > 1
params = {
min_flags: SiteSetting.min_flags_staff_visibility,
hidden_reasons: Post.hidden_reasons.only(:flagged_by_tl3_user, :flagged_by_tl4_user).values
}
relation.having(<<~SQL, params)
(COUNT(*) >= :min_flags) OR
(SUM(CASE
WHEN posts.hidden_reason_id IN (:hidden_reasons) THEN 1
ELSE 0
END) > 0)
SQL
end
def self.update_flagged_posts_count
flagged_relation = PostAction.active
.flags
.joins(post: :topic)
.where('posts.deleted_at' => nil)
.where('topics.deleted_at' => nil)
.where('posts.user_id > 0')
.group("posts.id")
flagged_relation = apply_minimum_visibility(flagged_relation)
posts_flagged_count = flagged_relation
.pluck("posts.id")
.count
$redis.set('posts_flagged_count', posts_flagged_count)
user_ids = User.staff.pluck(:id)
MessageBus.publish('/flagged_counts', { total: posts_flagged_count }, user_ids: user_ids)
end
def self.flagged_posts_count
$redis.get('posts_flagged_count').to_i
end
def self.counts_for(collection, user)
return {} if collection.blank? || !user
collection_ids = collection.map(&:id)
user_id = user.try(:id) || 0
post_actions = PostAction.where(post_id: collection_ids, user_id: user_id)
user_actions = {}
post_actions.each do |post_action|
user_actions[post_action.post_id] ||= {}
user_actions[post_action.post_id][post_action.post_action_type_id] = post_action
end
user_actions
end
def self.lookup_for(user, topics, post_action_type_id)
return if topics.blank?
# in critical path 2x faster than AR
#
topic_ids = topics.map(&:id)
map = {}
builder = DB.build <<~SQL
SELECT p.topic_id, p.post_number
FROM post_actions pa
JOIN posts p ON pa.post_id = p.id
WHERE p.deleted_at IS NULL AND pa.deleted_at IS NULL AND
pa.post_action_type_id = :post_action_type_id AND
pa.user_id = :user_id AND
p.topic_id IN (:topic_ids)
ORDER BY p.topic_id, p.post_number
SQL
builder.query(user_id: user.id, post_action_type_id: post_action_type_id, topic_ids: topic_ids).each do |row|
(map[row.topic_id] ||= []) << row.post_number
end
map
end
def self.active_flags_counts_for(collection)
return {} if collection.blank?
collection_ids = collection.map(&:id)
post_actions = PostAction.active.flags.where(post_id: collection_ids)
user_actions = {}
post_actions.each do |post_action|
user_actions[post_action.post_id] ||= {}
user_actions[post_action.post_id][post_action.post_action_type_id] ||= []
user_actions[post_action.post_id][post_action.post_action_type_id] << post_action
end
user_actions
end
def self.count_per_day_for_type(post_action_type, opts = nil)
opts ||= {}
result = unscoped.where(post_action_type_id: post_action_type)
result = result.where('post_actions.created_at >= ?', opts[:start_date] || (opts[:since_days_ago] || 30).days.ago)
result = result.where('post_actions.created_at <= ?', opts[:end_date]) if opts[:end_date]
result = result.joins(post: :topic).merge(Topic.in_category_and_subcategories(opts[:category_id])) if opts[:category_id]
result.group('date(post_actions.created_at)')
.order('date(post_actions.created_at)')
.count
end
def self.agree_flags!(post, moderator, delete_post = false)
actions = PostAction.active
.where(post_id: post.id)
.where(post_action_type_id: PostActionType.notify_flag_types.values)
trigger_spam = false
actions.each do |action|
action.agreed_at = Time.zone.now
action.agreed_by_id = moderator.id
# so callback is called
action.save
action.add_moderator_post_if_needed(moderator, :agreed, delete_post)
trigger_spam = true if action.post_action_type_id == PostActionType.types[:spam]
end
# Update the flags_agreed user stat
UserStat.where(user_id: actions.map(&:user_id)).update_all("flags_agreed = flags_agreed + 1")
DiscourseEvent.trigger(:confirmed_spam_post, post) if trigger_spam
if actions.first.present?
DiscourseEvent.trigger(:flag_reviewed, post)
DiscourseEvent.trigger(:flag_agreed, actions.first)
end
update_flagged_posts_count
end
def self.clear_flags!(post, moderator)
# -1 is the automatic system cleary
action_type_ids =
if moderator.id == Discourse::SYSTEM_USER_ID
PostActionType.auto_action_flag_types.values
else
PostActionType.notify_flag_type_ids
end
actions = PostAction.active.where(post_id: post.id).where(post_action_type_id: action_type_ids)
actions.each do |action|
action.disagreed_at = Time.zone.now
action.disagreed_by_id = moderator.id
# so callback is called
action.save
action.add_moderator_post_if_needed(moderator, :disagreed)
end
# Update the flags_disagreed user stat
UserStat.where(user_id: actions.map(&:user_id)).update_all("flags_disagreed = flags_disagreed + 1")
# reset all cached counters
cached = {}
action_type_ids.each do |atid|
column = "#{PostActionType.types[atid]}_count"
cached[column] = 0 if ActiveRecord::Base.connection.column_exists?(:posts, column)
end
Post.with_deleted.where(id: post.id).update_all(cached)
if actions.first.present?
DiscourseEvent.trigger(:flag_reviewed, post)
DiscourseEvent.trigger(:flag_disagreed, actions.first)
end
update_flagged_posts_count
undo_hide_and_silence(post)
end
def self.defer_flags!(post, moderator, delete_post = false)
actions = PostAction.active
.where(post_id: post.id)
.where(post_action_type_id: PostActionType.notify_flag_type_ids)
actions.each do |action|
action.deferred_at = Time.zone.now
action.deferred_by_id = moderator.id
# so callback is called
action.save
action.add_moderator_post_if_needed(moderator, :deferred, delete_post)
end
if actions.first.present?
DiscourseEvent.trigger(:flag_reviewed, post)
DiscourseEvent.trigger(:flag_deferred, actions.first)
end
update_flagged_posts_count
end
def add_moderator_post_if_needed(moderator, disposition, delete_post = false)
return if !SiteSetting.auto_respond_to_flag_actions
return if related_post.nil? || related_post.topic.nil?
return if staff_already_replied?(related_post.topic)
message_key = "flags_dispositions.#{disposition}"
message_key << "_and_deleted" if delete_post
I18n.with_locale(SiteSetting.default_locale) do
related_post.topic.add_moderator_post(moderator, I18n.t(message_key))
end
end
def staff_already_replied?(topic)
topic.posts.where("user_id IN (SELECT id FROM users WHERE moderator OR admin) OR (post_type != :regular_post_type)", regular_post_type: Post.types[:regular]).exists?
end
def self.create_message_for_post_action(user, post, post_action_type_id, opts)
post_action_type = PostActionType.types[post_action_type_id]
return unless opts[:message] && [:notify_moderators, :notify_user, :spam].include?(post_action_type)
title = I18n.t("post_action_types.#{post_action_type}.email_title", title: post.topic.title, locale: SiteSetting.default_locale)
body = I18n.t("post_action_types.#{post_action_type}.email_body", message: opts[:message], link: "#{Discourse.base_url}#{post.url}", locale: SiteSetting.default_locale)
warning = opts[:is_warning] if opts[:is_warning].present?
title = title.truncate(SiteSetting.max_topic_title_length, separator: /\s/)
opts = {
archetype: Archetype.private_message,
is_warning: warning,
title: title,
raw: body
}
if [:notify_moderators, :spam].include?(post_action_type)
opts[:subtype] = TopicSubtype.notify_moderators
opts[:target_group_names] = target_moderators
else
opts[:subtype] = TopicSubtype.notify_user
opts[:target_usernames] =
if post_action_type == :notify_user
post.user.username
elsif post_action_type != :notify_moderators
# this is a hack to allow a PM with no recipients, we should think through
# a cleaner technique, a PM with myself is valid for flagging
'x'
end
end
PostCreator.new(user, opts).create!&.id
end
def self.limit_action!(user, post, post_action_type_id)
RateLimiter.new(user, "post_action-#{post.id}_#{post_action_type_id}", 4, 1.minute).performed!
end
def self.act(user, post, post_action_type_id, opts = {})
limit_action!(user, post, post_action_type_id)
begin
related_post_id = create_message_for_post_action(user, post, post_action_type_id, opts)
rescue ActiveRecord::RecordNotSaved => e
raise FailedToCreatePost.new(e.message)
end
staff_took_action = opts[:take_action] || false
targets_topic =
if opts[:flag_topic] && post.topic
post.topic.reload.posts_count != 1
end
where_attrs = {
post_id: post.id,
user_id: user.id,
post_action_type_id: post_action_type_id
}
action_attrs = {
staff_took_action: staff_took_action,
related_post_id: related_post_id,
targets_topic: !!targets_topic
}
# First try to revive a trashed record
post_action = PostAction.where(where_attrs)
.with_deleted
.where("deleted_at IS NOT NULL")
.first
if post_action
post_action.recover!
action_attrs.each { |attr, val| post_action.send("#{attr}=", val) }
post_action.save
PostActionNotifier.post_action_created(post_action)
else
post_action = create(where_attrs.merge(action_attrs))
if post_action && post_action.errors.count == 0
BadgeGranter.queue_badge_grant(Badge::Trigger::PostAction, post_action: post_action)
end
end
if post_action && PostActionType.notify_flag_type_ids.include?(post_action_type_id)
DiscourseEvent.trigger(:flag_created, post_action)
end
GivenDailyLike.increment_for(user.id) if post_action_type_id == PostActionType.types[:like]
# agree with other flags
if staff_took_action
PostAction.agree_flags!(post, user)
post_action.try(:update_counters)
end
post_action
rescue ActiveRecord::RecordNotUnique
# can happen despite being .create
# since already bookmarked
PostAction.where(where_attrs).first
end
def self.undo_hide_and_silence(post)
return unless post.hidden?
post.unhide!
UserSilencer.unsilence(post.user) if UserSilencer.was_silenced_for?(post)
end
def self.copy(original_post, target_post)
cols_to_copy = (column_names - %w{id post_id}).join(', ')
DB.exec <<~SQL
INSERT INTO post_actions(post_id, #{cols_to_copy})
SELECT #{target_post.id}, #{cols_to_copy}
FROM post_actions
WHERE post_id = #{original_post.id}
SQL
target_post.post_actions.each { |post_action| post_action.update_counters }
end
def self.remove_act(user, post, post_action_type_id)
limit_action!(user, post, post_action_type_id)
finder = PostAction.where(post_id: post.id, user_id: user.id, post_action_type_id: post_action_type_id)
finder = finder.with_deleted.includes(:post) if user.try(:staff?)
if action = finder.first
action.remove_act!(user)
action.post.unhide! if action.staff_took_action
GivenDailyLike.decrement_for(user.id) if post_action_type_id == PostActionType.types[:like]
end
end
def remove_act!(user)
trash!(user)
# NOTE: save is called to ensure all callbacks are called
# trash will not trigger callbacks, and triggering after_commit
# is not trivial
save
end
def is_bookmark?
post_action_type_id == PostActionType.types[:bookmark]
end
def is_like?
post_action_type_id == PostActionType.types[:like]
end
def is_flag?
!!PostActionType.notify_flag_types[post_action_type_id]
end
def is_private_message?
post_action_type_id == PostActionType.types[:notify_user] ||
post_action_type_id == PostActionType.types[:notify_moderators]
end
# A custom rate limiter for this model
def post_action_rate_limiter
return unless is_flag? || is_bookmark? || is_like?
return @rate_limiter if @rate_limiter.present?
%w(like flag bookmark).each do |type|
if send("is_#{type}?")
limit = SiteSetting.send("max_#{type}s_per_day")
if is_like? && user && user.trust_level >= 2
multiplier = SiteSetting.send("tl#{user.trust_level}_additional_likes_per_day_multiplier").to_f
multiplier = 1.0 if multiplier < 1.0
limit = (limit * multiplier).to_i
end
@rate_limiter = RateLimiter.new(user, "create_#{type}", limit, 1.day.to_i)
return @rate_limiter
end
end
end
before_create do
post_action_type_ids = is_flag? ? PostActionType.notify_flag_types.values : post_action_type_id
raise AlreadyActed if PostAction.where(user_id: user_id)
.where(post_id: post_id)
.where(post_action_type_id: post_action_type_ids)
.where(deleted_at: nil)
.where(disagreed_at: nil)
.where(targets_topic: targets_topic)
.exists?
end
# Returns the flag counts for a post, taking into account that some users
# can weigh flags differently.
def self.flag_counts_for(post_id)
params = {
post_id: post_id,
post_action_types: PostActionType.auto_action_flag_types.values,
flags_required_to_hide_post: SiteSetting.flags_required_to_hide_post
}
DB.query_single(<<~SQL, params)
SELECT COALESCE(SUM(CASE
WHEN pa.disagreed_at IS NOT NULL AND pa.staff_took_action THEN :flags_required_to_hide_post
WHEN pa.disagreed_at IS NOT NULL AND NOT pa.staff_took_action THEN 1
ELSE 0
END),0) AS old_flags,
COALESCE(SUM(CASE
WHEN pa.disagreed_at IS NULL AND pa.staff_took_action THEN :flags_required_to_hide_post
WHEN pa.disagreed_at IS NULL AND NOT pa.staff_took_action THEN 1
ELSE 0
END), 0) AS new_flags
FROM post_actions AS pa
INNER JOIN users AS u ON u.id = pa.user_id
WHERE pa.post_id = :post_id
AND pa.post_action_type_id in (:post_action_types)
AND pa.deleted_at IS NULL
SQL
end
def post_action_type_key
PostActionType.types[post_action_type_id]
end
def update_counters
# Update denormalized counts
column = "#{post_action_type_key}_count"
count = PostAction.where(post_id: post_id)
.where(post_action_type_id: post_action_type_id)
.count
# We probably want to refactor this method to something cleaner.
case post_action_type_key
when :like
# 'like_score' is weighted higher for staff accounts
score = PostAction.joins(:user)
.where(post_id: post_id)
.sum("CASE WHEN users.moderator OR users.admin THEN #{SiteSetting.staff_like_weight} ELSE 1 END")
Post.where(id: post_id).update_all ["like_count = :count, like_score = :score", count: count, score: score]
else
if ActiveRecord::Base.connection.column_exists?(:posts, column)
Post.where(id: post_id).update_all ["#{column} = ?", count]
end
end
topic_id = Post.with_deleted.where(id: post_id).pluck(:topic_id).first
# topic_user
if [:like, :bookmark].include? post_action_type_key
TopicUser.update_post_action_cache(user_id: user_id,
topic_id: topic_id,
post_action_type: post_action_type_key)
end
if column == "like_count"
topic_count = Post.where(topic_id: topic_id).sum(column)
Topic.where(id: topic_id).update_all ["#{column} = ?", topic_count]
end
if PostActionType.notify_flag_type_ids.include?(post_action_type_id)
PostAction.update_flagged_posts_count
end
end
def enforce_rules
post = Post.with_deleted.where(id: post_id).first
PostAction.auto_close_if_threshold_reached(post.topic)
PostAction.auto_hide_if_needed(user, post, post_action_type_key)
SpamRule::AutoSilence.new(post.user, post).perform
end
def create_user_action
if is_bookmark? || is_like?
UserActionCreator.log_post_action(self)
end
end
def update_notifications
if self.deleted_at.present?
PostActionNotifier.post_action_deleted(self)
end
end
def create_notifications
PostActionNotifier.post_action_created(self)
end
def notify_subscribers
if (is_like? || is_flag?) && post
post.publish_change_to_clients! :acted
end
end
MAXIMUM_FLAGS_PER_POST = 3
def self.auto_close_threshold_reached?(topic)
return if topic.user&.staff?
flags = PostAction.active
.flags
.joins(:post)
.where("posts.topic_id = ?", topic.id)
.where("post_actions.user_id > 0")
.group("post_actions.user_id")
.pluck("post_actions.user_id, COUNT(post_id)")
# we need a minimum number of unique flaggers
return if flags.count < SiteSetting.num_flaggers_to_close_topic
# we need a minimum number of flags
return if flags.sum { |f| f[1] } < SiteSetting.num_flags_to_close_topic
true
end
def self.auto_close_if_threshold_reached(topic)
return if topic.nil? || topic.closed?
return unless auto_close_threshold_reached?(topic)
# the threshold has been reached, we will close the topic waiting for intervention
topic.update_status("closed", true, Discourse.system_user,
message: I18n.t(
"temporarily_closed_due_to_flags",
count: SiteSetting.num_hours_to_close_topic
)
)
topic.set_or_create_timer(
TopicTimer.types[:open],
SiteSetting.num_hours_to_close_topic,
by_user: Discourse.system_user
)
end
def self.auto_hide_if_needed(acting_user, post, post_action_type)
return if post.hidden?
return if (!acting_user.staff?) && post.user&.staff?
if post_action_type == :spam &&
acting_user.has_trust_level?(TrustLevel[3]) &&
post.user&.trust_level == TrustLevel[0]
hide_post!(post, post_action_type, Post.hidden_reasons[:flagged_by_tl3_user])
elsif PostActionType.auto_action_flag_types.include?(post_action_type)
if acting_user.has_trust_level?(TrustLevel[4]) &&
!acting_user.staff? &&
post.user&.trust_level != TrustLevel[4]
hide_post!(post, post_action_type, Post.hidden_reasons[:flagged_by_tl4_user])
elsif SiteSetting.flags_required_to_hide_post > 0
_old_flags, new_flags = PostAction.flag_counts_for(post.id)
if new_flags >= SiteSetting.flags_required_to_hide_post
hide_post!(post, post_action_type, guess_hide_reason(post))
end
end
end
end
def self.hide_post!(post, post_action_type, reason = nil)
return if post.hidden
unless reason
reason = guess_hide_reason(post)
end
hiding_again = post.hidden_at.present?
post.hidden = true
post.hidden_at = Time.zone.now
post.hidden_reason_id = reason
post.save
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)
# inform user
if post.user
options = {
url: post.url,
edit_delay: SiteSetting.cooldown_minutes_after_hiding_posts,
flag_reason: I18n.t(
"flag_reasons.#{post_action_type}",
locale: SiteSetting.default_locale,
base_path: Discourse.base_path
)
}
Jobs.enqueue_in(5.seconds, :send_system_message,
user_id: post.user.id,
message_type: hiding_again ? :post_hidden_again : :post_hidden,
message_options: options)
end
update_flagged_posts_count
end
def self.guess_hide_reason(post)
post.hidden_at ?
Post.hidden_reasons[:flag_threshold_reached_again] :
Post.hidden_reasons[:flag_threshold_reached]
end
def self.post_action_type_for_post(post_id)
post_action = PostAction.find_by(deferred_at: nil, post_id: post_id, post_action_type_id: PostActionType.notify_flag_types.values, deleted_at: nil)
PostActionType.types[post_action.post_action_type_id] if post_action
end
def self.target_moderators
Group[:moderators].name
end
end
# == Schema Information
#
# Table name: post_actions
#
# id :integer not null, primary key
# post_id :integer not null
# user_id :integer not null
# post_action_type_id :integer not null
# deleted_at :datetime
# created_at :datetime not null
# updated_at :datetime not null
# deleted_by_id :integer
# related_post_id :integer
# staff_took_action :boolean default(FALSE), not null
# deferred_by_id :integer
# targets_topic :boolean default(FALSE), not null
# agreed_at :datetime
# agreed_by_id :integer
# deferred_at :datetime
# disagreed_at :datetime
# disagreed_by_id :integer
#
# Indexes
#
# idx_unique_actions (user_id,post_action_type_id,post_id,targets_topic) UNIQUE WHERE ((deleted_at IS NULL) AND (disagreed_at IS NULL) AND (deferred_at IS NULL))
# idx_unique_flags (user_id,post_id,targets_topic) UNIQUE WHERE ((deleted_at IS NULL) AND (disagreed_at IS NULL) AND (deferred_at IS NULL) AND (post_action_type_id = ANY (ARRAY[3, 4, 7, 8])))
# index_post_actions_on_post_id (post_id)
# index_post_actions_on_user_id_and_post_action_type_id (user_id,post_action_type_id) WHERE (deleted_at IS NULL)
#