discourse/app/models/post.rb

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require_dependency 'jobs'
require_dependency 'pretty_text'
require_dependency 'rate_limiter'
require_dependency 'post_revisor'
require_dependency 'enum'
require_dependency 'trashable'
require_dependency 'post_analyzer'
require_dependency 'validators/post_validator'
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require 'archetype'
require 'digest/sha1'
class Post < ActiveRecord::Base
include RateLimiter::OnCreateRecord
include Trashable
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versioned if: :raw_changed?
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rate_limit
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belongs_to :user
belongs_to :topic, counter_cache: :posts_count
belongs_to :reply_to_user, class_name: "User"
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has_many :post_replies
has_many :replies, through: :post_replies
has_many :post_actions
has_many :topic_links
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has_and_belongs_to_many :upload
has_one :post_search_data
validates_with ::Validators::PostValidator
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# We can pass a hash of image sizes when saving to prevent crawling those images
attr_accessor :image_sizes, :quoted_post_numbers, :no_bump, :invalidate_oneboxes
SHORT_POST_CHARS = 1200
scope :by_newest, -> { order('created_at desc, id desc') }
scope :by_post_number, -> { order('post_number ASC') }
scope :with_user, -> { includes(:user) }
scope :public_posts, -> { joins(:topic).where('topics.archetype <> ?', Archetype.private_message) }
scope :private_posts, -> { joins(:topic).where('topics.archetype = ?', Archetype.private_message) }
scope :with_topic_subtype, ->(subtype) { joins(:topic).where('topics.subtype = ?', subtype) }
def self.hidden_reasons
@hidden_reasons ||= Enum.new(:flag_threshold_reached, :flag_threshold_reached_again, :new_user_spam_threshold_reached)
end
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def self.types
@types ||= Enum.new(:regular, :moderator_action)
end
def trash!
self.topic_links.each(&:destroy)
super
end
def recover!
super
update_flagged_posts_count
TopicLink.extract_from(self)
end
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# The key we use in redis to ensure unique posts
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def unique_post_key
"post-#{user_id}:#{raw_hash}"
end
def raw_hash
return if raw.blank?
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Digest::SHA1.hexdigest(raw.gsub(/\s+/, "").downcase)
end
def reset_cooked
@cooked_document = nil
self.cooked = nil
end
def self.white_listed_image_classes
@white_listed_image_classes ||= ['avatar', 'favicon', 'thumbnail']
end
def post_analyzer
@post_analyzer = PostAnalyzer.new(raw, topic_id)
end
%w{raw_mentions linked_hosts image_count link_count raw_links}.each do |attr|
define_method(attr) do
PostAnalyzer.new(raw, topic_id).send(attr)
end
end
def cook(*args)
PostAnalyzer.new(raw, topic_id).cook(*args)
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end
# Sometimes the post is being edited by someone else, for example, a mod.
# If that's the case, they should not be bound by the original poster's
# restrictions, for example on not posting images.
def acting_user
@acting_user || user
end
def acting_user=(pu)
@acting_user = pu
end
def total_hosts_usage
hosts = linked_hosts.clone
TopicLink.where(domain: hosts.keys, user_id: acting_user.id)
.group(:domain, :post_id)
.count.keys.each do |tuple|
domain = tuple[0]
hosts[domain] = (hosts[domain] || 0) + 1
end
hosts
end
# Prevent new users from posting the same hosts too many times.
def has_host_spam?
return false if acting_user.present? && acting_user.has_trust_level?(:basic)
total_hosts_usage.each do |host, count|
return true if count >= SiteSetting.newuser_spam_host_threshold
end
false
end
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def archetype
topic.archetype
end
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def self.regular_order
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order(:sort_order, :post_number)
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end
def self.reverse_order
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order('sort_order desc, post_number desc')
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end
def self.best_of
where(["(post_number = 1) or (percent_rank <= ?)", SiteSetting.best_of_percent_filter.to_f / 100.0])
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end
def update_flagged_posts_count
PostAction.update_flagged_posts_count
end
def filter_quotes(parent_post = nil)
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return cooked if parent_post.blank?
# We only filter quotes when there is exactly 1
return cooked unless (quote_count == 1)
parent_raw = parent_post.raw.sub(/\[quote.+\/quote\]/m, '')
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if raw[parent_raw] || (parent_raw.size < SHORT_POST_CHARS)
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return cooked.sub(/\<aside.+\<\/aside\>/m, '')
end
cooked
end
def username
user.username
end
def external_id
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"#{topic_id}/#{post_number}"
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end
def quoteless?
(quote_count == 0) && (reply_to_post_number.present?)
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end
def reply_notification_target
return if reply_to_post_number.blank?
Post.where("topic_id = :topic_id AND post_number = :post_number AND user_id <> :user_id",
topic_id: topic_id,
post_number: reply_to_post_number,
user_id: user_id).first.try(:user)
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end
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def self.excerpt(cooked, maxlength = nil, options = {})
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maxlength ||= SiteSetting.post_excerpt_maxlength
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PrettyText.excerpt(cooked, maxlength, options)
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end
# Strip out most of the markup
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def excerpt(maxlength = nil, options = {})
Post.excerpt(cooked, maxlength, options)
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end
# A list of versions including the initial version
def all_versions
result = []
result << { number: 1, display_username: user.username, created_at: created_at }
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versions.order(:number).includes(:user).each do |v|
if v.user.present?
result << { number: v.number, display_username: v.user.username, created_at: v.created_at }
end
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end
result
end
def is_first_post?
post_number == 1
end
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def is_flagged?
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post_actions.where(post_action_type_id: PostActionType.flag_types.values, deleted_at: nil).count != 0
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end
def unhide!
self.hidden = false
self.hidden_reason_id = nil
self.topic.update_attributes(visible: true)
save
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end
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def url
Post.url(topic.slug, topic.id, post_number)
end
def self.url(slug, topic_id, post_number)
"/t/#{slug}/#{topic_id}/#{post_number}"
end
def self.urls(post_ids)
ids = post_ids.map{|u| u}
if ids.length > 0
urls = {}
Topic.joins(:posts).where('posts.id' => ids).
select(['posts.id as post_id','post_number', 'topics.slug', 'topics.title', 'topics.id']).
each do |t|
urls[t.post_id.to_i] = url(t.slug, t.id, t.post_number)
end
urls
else
{}
end
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end
def author_readable
user.readable_name
end
def revise(updated_by, new_raw, opts = {})
PostRevisor.new(self).revise!(updated_by, new_raw, opts)
end
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before_create do
PostCreator.before_create_tasks(self)
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end
# TODO: Move some of this into an asynchronous job?
# TODO: Move into PostCreator
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after_create do
PostCreator.after_create_tasks(self)
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end
# This calculates the geometric mean of the post timings and stores it along with
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# each post.
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def self.calculate_avg_time
retry_lock_error do
exec_sql("UPDATE posts
SET avg_time = (x.gmean / 1000)
FROM (SELECT post_timings.topic_id,
post_timings.post_number,
round(exp(avg(ln(msecs)))) AS gmean
FROM post_timings
INNER JOIN posts AS p2
ON p2.post_number = post_timings.post_number
AND p2.topic_id = post_timings.topic_id
AND p2.user_id <> post_timings.user_id
GROUP BY post_timings.topic_id, post_timings.post_number) AS x
WHERE x.topic_id = posts.topic_id
AND x.post_number = posts.post_number")
end
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end
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before_save do
self.last_editor_id ||= user_id
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self.cooked = cook(raw, topic_id: topic_id) unless new_record?
end
def advance_draft_sequence
return if topic.blank? # could be deleted
DraftSequence.next!(last_editor_id, topic.draft_key)
end
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# Determine what posts are quoted by this post
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def extract_quoted_post_numbers
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temp_collector = []
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# Create relationships for the quotes
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raw.scan(/\[quote=\"([^"]+)"\]/).each do |quote|
args = parse_quote_into_arguments(quote)
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# If the topic attribute is present, ensure it's the same topic
temp_collector << args[:post] unless (args[:topic].present? && topic_id != args[:topic])
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end
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temp_collector.uniq!
self.quoted_post_numbers = temp_collector
self.quote_count = temp_collector.size
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end
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def save_reply_relationships
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add_to_quoted_post_numbers(reply_to_post_number)
return if self.quoted_post_numbers.blank?
# Create a reply relationship between quoted posts and this new post
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self.quoted_post_numbers.each do |p|
post = Post.where(topic_id: topic_id, post_number: p).first
create_reply_relationship_with(post)
end
end
# Enqueue post processing for this post
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def trigger_post_process
args = { post_id: id }
args[:image_sizes] = image_sizes if image_sizes.present?
args[:invalidate_oneboxes] = true if invalidate_oneboxes.present?
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Jobs.enqueue(:process_post, args)
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end
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def self.public_posts_count_per_day(since_days_ago=30)
public_posts.where('posts.created_at > ?', since_days_ago.days.ago).group('date(posts.created_at)').order('date(posts.created_at)').count
end
def self.private_messages_count_per_day(since_days_ago, topic_subtype)
private_posts.with_topic_subtype(topic_subtype).where('posts.created_at > ?', since_days_ago.days.ago).group('date(posts.created_at)').order('date(posts.created_at)').count
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end
private
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def parse_quote_into_arguments(quote)
return {} unless quote.present?
args = {}
quote.first.scan(/([a-z]+)\:(\d+)/).each do |arg|
args[arg[0].to_sym] = arg[1].to_i
end
args
end
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def add_to_quoted_post_numbers(num)
return unless num.present?
self.quoted_post_numbers ||= []
self.quoted_post_numbers << num
end
def create_reply_relationship_with(post)
return if post.nil?
post_reply = post.post_replies.new(reply_id: id)
if post_reply.save
Post.update_all ['reply_count = reply_count + 1'], id: post.id
end
end
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end
# == Schema Information
#
# Table name: posts
#
# id :integer not null, primary key
# user_id :integer not null
# topic_id :integer not null
# post_number :integer not null
# raw :text not null
# cooked :text not null
# created_at :datetime not null
# updated_at :datetime not null
# reply_to_post_number :integer
# cached_version :integer default(1), not null
# reply_count :integer default(0), not null
# quote_count :integer default(0), not null
# deleted_at :datetime
# off_topic_count :integer default(0), not null
# like_count :integer default(0), not null
# incoming_link_count :integer default(0), not null
# bookmark_count :integer default(0), not null
# avg_time :integer
# score :float
# reads :integer default(0), not null
# post_type :integer default(1), not null
# vote_count :integer default(0), not null
# sort_order :integer
# last_editor_id :integer
# hidden :boolean default(FALSE), not null
# hidden_reason_id :integer
# notify_moderators_count :integer default(0), not null
# spam_count :integer default(0), not null
# illegal_count :integer default(0), not null
# inappropriate_count :integer default(0), not null
# last_version_at :datetime not null
# user_deleted :boolean default(FALSE), not null
# reply_to_user_id :integer
# percent_rank :float default(1.0)
# notify_user_count :integer default(0), not null
#
# Indexes
#
# idx_posts_user_id_deleted_at (user_id)
# index_posts_on_reply_to_post_number (reply_to_post_number)
# index_posts_on_topic_id_and_post_number (topic_id,post_number) UNIQUE
#