require_dependency 'jobs' require_dependency 'pretty_text' require_dependency 'rate_limiter' require_dependency 'post_revisor' require_dependency 'enum' require 'archetype' require 'digest/sha1' class Post < ActiveRecord::Base include RateLimiter::OnCreateRecord versioned if: :raw_changed? rate_limit acts_as_paranoid after_recover :update_flagged_posts_count belongs_to :user belongs_to :topic, counter_cache: :posts_count belongs_to :reply_to_user, class_name: "User" has_many :post_replies has_many :replies, through: :post_replies has_many :post_actions validates_presence_of :raw, :user_id, :topic_id validates :raw, stripped_length: { in: SiteSetting.post_length } validate :raw_quality validate :max_mention_validator validate :max_images_validator validate :max_links_validator validate :unique_post_validator # 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 :with_user, includes(:user) def self.hidden_reasons @hidden_reasons ||= Enum.new(:flag_threshold_reached, :flag_threshold_reached_again) end def self.types @types ||= Enum.new(:regular, :moderator_action) end def raw_quality sentinel = TextSentinel.new(raw, min_entropy: SiteSetting.body_min_entropy) if sentinel.valid? # It's possible the sentinel has cleaned up the title a bit self.raw = sentinel.text else errors.add(:raw, I18n.t(:is_invalid)) unless sentinel.valid? end end # Stop us from posting the same thing too quickly def unique_post_validator return if SiteSetting.unique_posts_mins == 0 return if user.admin? || user.moderator? # If the post is empty, default to the validates_presence_of return if raw.blank? if $redis.exists(unique_post_key) errors.add(:raw, I18n.t(:just_posted_that)) end end # The key we use in redis to ensure unique posts def unique_post_key "post-#{user_id}:#{raw_hash}" end def raw_hash return if raw.blank? Digest::SHA1.hexdigest(raw.gsub(/\s+/, "").downcase) end def cooked_document self.cooked ||= cook(raw, topic_id: topic_id) @cooked_document ||= Nokogiri::HTML.fragment(cooked) end def reset_cooked @cooked_document = nil self.cooked = nil end def self.white_listed_image_classes @white_listed_image_classes ||= ['avatar'] end def image_count return 0 unless raw.present? cooked_document.search("img").reject do |t| dom_class = t["class"] if dom_class (Post.white_listed_image_classes & dom_class.split(" ")).count > 0 end end.count end def link_count return 0 unless raw.present? cooked_document.search("a[href]").count end def max_mention_validator errors.add(:raw, I18n.t(:too_many_mentions)) if raw_mentions.size > SiteSetting.max_mentions_per_post end def max_images_validator return if user.present? && user.has_trust_level?(:basic) errors.add(:raw, I18n.t(:too_many_images)) if image_count > 0 end def max_links_validator return if user.present? && user.has_trust_level?(:basic) errors.add(:raw, I18n.t(:too_many_links)) if link_count > 1 end def raw_mentions return [] if raw.blank? # We don't count mentions in quotes return @raw_mentions if @raw_mentions.present? raw_stripped = raw.gsub(/\[quote=(.*)\]([^\[]*?)\[\/quote\]/im, '') # Strip pre and code tags doc = Nokogiri::HTML.fragment(raw_stripped) doc.search("pre").remove doc.search("code").remove results = doc.to_html.scan(PrettyText.mention_matcher) @raw_mentions = results.uniq.map { |un| un.first.downcase.gsub!(/^@/, '') } end def archetype topic.archetype end def self.regular_order order(:sort_order, :post_number) end def self.reverse_order order('sort_order desc, post_number desc') end def self.best_of where("(post_number = 1) or (score >= ?)", SiteSetting.best_of_score_threshold) end def update_flagged_posts_count PostAction.update_flagged_posts_count end def filter_quotes(parent_post = nil) 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, '') if raw[parent_raw] || (parent_raw.size < SHORT_POST_CHARS) return cooked.sub(/\/m, '') end cooked end def username user.username end def external_id "#{topic_id}/#{post_number}" end def quoteless? (quote_count == 0) && (reply_to_post_number.present?) 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) end def self.excerpt(cooked, maxlength = nil) maxlength ||= SiteSetting.post_excerpt_maxlength PrettyText.excerpt(cooked, maxlength) end # Strip out most of the markup def excerpt(maxlength = nil) Post.excerpt(cooked, maxlength) end # What we use to cook posts def cook(*args) cooked = PrettyText.cook(*args) # If we have any of the oneboxes in the cache, throw them in right away, don't # wait for the post processor. dirty = false doc = Oneboxer.each_onebox_link(cooked) do |url, elem| cached = Oneboxer.render_from_cache(url) if cached.present? elem.swap(cached) dirty = true end end cooked = doc.to_html if dirty cooked end # A list of versions including the initial version def all_versions result = [] result << { number: 1, display_username: user.username, created_at: created_at } 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 end result end def is_flagged? post_actions.where(post_action_type_id: PostActionType.flag_types.values, deleted_at: nil).count != 0 end def unhide! self.hidden = false self.hidden_reason_id = nil self.topic.update_attributes(visible: true) save end def url "/t/#{Slug.for(topic.title)}/#{topic.id}/#{post_number}" 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 # TODO: move into PostCreator # Various callbacks before_create do if reply_to_post_number.present? self.reply_to_user_id ||= Post.select(:user_id).where(topic_id: topic_id, post_number: reply_to_post_number).first.try(:user_id) end self.post_number ||= Topic.next_post_number(topic_id, reply_to_post_number.present?) self.cooked ||= cook(raw, topic_id: topic_id) self.sort_order = post_number DiscourseEvent.trigger(:before_create_post, self) self.last_version_at ||= Time.now end # TODO: Move some of this into an asynchronous job? # TODO: Move into PostCreator after_create do # Update attributes on the topic - featured users and last posted. attrs = {last_posted_at: created_at, last_post_user_id: user_id} attrs[:bumped_at] = created_at unless no_bump topic.update_attributes(attrs) # Update topic user data TopicUser.change(user, topic.id, posted: true, last_read_post_number: post_number, seen_post_count: post_number) end # This calculates the geometric mean of the post timings and stores it along with # each post. 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 end before_save do self.last_editor_id ||= user_id 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 # Determine what posts are quoted by this post def extract_quoted_post_numbers self.quoted_post_numbers = [] # Create relationships for the quotes raw.scan(/\[quote=\"([^"]+)"\]/).each do |m| if m.present? args = {} m.first.scan(/([a-z]+)\:(\d+)/).each do |arg| args[arg[0].to_sym] = arg[1].to_i end if args[:topic].present? # If the topic attribute is present, ensure it's the same topic self.quoted_post_numbers << args[:post] if topic_id == args[:topic] else self.quoted_post_numbers << args[:post] end end end self.quoted_post_numbers.uniq! self.quote_count = quoted_post_numbers.size end def save_reply_relationships self.quoted_post_numbers ||= [] self.quoted_post_numbers << reply_to_post_number if reply_to_post_number.present? # Create a reply relationship between quoted posts and this new post if self.quoted_post_numbers.present? self.quoted_post_numbers.map(&:to_i).uniq.each do |p| post = Post.where(topic_id: topic_id, post_number: p).first if post.present? 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 end end end # Enqueue post processing for this post 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? Jobs.enqueue(:process_post, args) end def self.count_per_day(since=30.days.ago) where('created_at > ?', since).group('date(created_at)').order('date(created_at)').count end end