require_dependency 'jobs/base' require_dependency 'pretty_text' require_dependency 'rate_limiter' require_dependency 'post_revisor' require_dependency 'enum' require_dependency 'post_analyzer' require_dependency 'validators/post_validator' require_dependency 'plugin/filter' require_dependency 'email_cook' require 'archetype' require 'digest/sha1' class Post < ActiveRecord::Base include RateLimiter::OnCreateRecord include Trashable include HasCustomFields include LimitedEdit # increase this number to force a system wide post rebake BAKED_VERSION = 1 rate_limit rate_limit :limit_posts_per_day 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 has_many :topic_links has_many :group_mentions, dependent: :destroy has_many :post_uploads has_many :uploads, through: :post_uploads has_one :post_search_data has_one :post_stat has_one :incoming_email has_many :post_details has_many :post_revisions has_many :revisions, foreign_key: :post_id, class_name: 'PostRevision' has_many :user_actions, foreign_key: :target_post_id validates_with ::Validators::PostValidator # We can pass several creating options to a post via attributes attr_accessor :image_sizes, :quoted_post_numbers, :no_bump, :invalidate_oneboxes, :cooking_options, :skip_unique_check 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 :created_since, lambda { |time_ago| where('posts.created_at > ?', time_ago) } 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) } scope :visible, -> { joins(:topic).where('topics.visible = true').where(hidden: false) } scope :secured, lambda { |guardian| where('posts.post_type in (?)', Topic.visible_post_types(guardian && guardian.user))} scope :for_mailing_list, ->(user, since) { created_since(since) .joins(:topic) .where(topic: Topic.for_digest(user, 100.years.ago)) # we want all topics with new content, regardless when they were created .order('posts.created_at ASC') } scope :mailing_list_new_topics, ->(user, since) { for_mailing_list(user, since).where('topics.created_at > ?', since) } scope :mailing_list_updates, ->(user, since) { for_mailing_list(user, since).where('topics.created_at <= ?', since) } delegate :username, to: :user def self.hidden_reasons @hidden_reasons ||= Enum.new(flag_threshold_reached: 1, flag_threshold_reached_again: 2, new_user_spam_threshold_reached: 3, flagged_by_tl3_user: 4) end def self.types @types ||= Enum.new(regular: 1, moderator_action: 2, small_action: 3, whisper: 4) end def self.cook_methods @cook_methods ||= Enum.new(regular: 1, raw_html: 2, email: 3) end def self.find_by_detail(key, value) includes(:post_details).find_by(post_details: { key: key, value: value }) end def whisper? post_type == Post.types[:whisper] end def add_detail(key, value, extra = nil) post_details.build(key: key, value: value, extra: extra) end def limit_posts_per_day if user && user.first_day_user? && post_number && post_number > 1 RateLimiter.new(user, "first-day-replies-per-day", SiteSetting.max_replies_in_first_day, 1.day.to_i) end end def publish_change_to_clients!(type, options = {}) # special failsafe for posts missing topics consistency checks should fix, but message # is safe to skip return unless topic channel = "/topic/#{topic_id}" msg = { id: id, post_number: post_number, updated_at: Time.now, user_id: user_id, last_editor_id: last_editor_id, type: type }.merge(options) if Topic.visible_post_types.include?(post_type) MessageBus.publish(channel, msg, group_ids: topic.secure_group_ids) else user_ids = User.where('admin or moderator or id = ?', user_id).pluck(:id) MessageBus.publish(channel, msg, user_ids: user_ids) end end def trash!(trashed_by=nil) self.topic_links.each(&:destroy) super(trashed_by) end def recover! super update_flagged_posts_count TopicLink.extract_from(self) QuotedPost.extract_from(self) if topic && topic.category_id && topic.category topic.category.update_latest end end # The key we use in redis to ensure unique posts def unique_post_key "unique-post-#{user_id}:#{raw_hash}" end def store_unique_post_key if SiteSetting.unique_posts_mins > 0 $redis.setex(unique_post_key, SiteSetting.unique_posts_mins.minutes.to_i, id) end end def matches_recent_post? post_id = $redis.get(unique_post_key) post_id != nil and post_id.to_i != id end def raw_hash return if raw.blank? Digest::SHA1.hexdigest(raw) end def self.white_listed_image_classes @white_listed_image_classes ||= ['avatar', 'favicon', 'thumbnail'] end def post_analyzer @post_analyzers ||= {} @post_analyzers[raw_hash] ||= PostAnalyzer.new(raw, topic_id) end %w{raw_mentions linked_hosts image_count attachment_count link_count raw_links}.each do |attr| define_method(attr) do post_analyzer.send(attr) end end def cook(*args) # For some posts, for example those imported via RSS, we support raw HTML. In that # case we can skip the rendering pipeline. return raw if cook_method == Post.cook_methods[:raw_html] cooked = nil if cook_method == Post.cook_methods[:email] cooked = EmailCook.new(raw).cook else cooked = if !self.user || SiteSetting.tl3_links_no_follow || !self.user.has_trust_level?(TrustLevel[3]) post_analyzer.cook(*args) else # At trust level 3, we don't apply nofollow to links cloned = args.dup cloned[1] ||= {} cloned[1][:omit_nofollow] = true post_analyzer.cook(*cloned) end end new_cooked = Plugin::Filter.apply(:after_post_cook, self, cooked) if post_type == Post.types[:regular] if new_cooked != cooked && new_cooked.blank? Rails.logger.debug("Plugin is blanking out post: #{self.url}\nraw: #{self.raw}") elsif new_cooked.blank? Rails.logger.debug("Blank post detected post: #{self.url}\nraw: #{self.raw}") end end new_cooked 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 last_editor self.last_editor_id ? (User.find_by_id(self.last_editor_id) || user) : user end def whitelisted_spam_hosts hosts = SiteSetting .white_listed_spam_host_domains .split('|') .map{|h| h.strip} .reject{|h| !h.include?('.')} hosts << GlobalSetting.hostname hosts << RailsMultisite::ConnectionManagement.current_hostname end def total_hosts_usage hosts = linked_hosts.clone whitelisted = whitelisted_spam_hosts hosts.reject! do |h| whitelisted.any? do |w| h.end_with?(w) end end return hosts if hosts.length == 0 TopicLink.where(domain: hosts.keys, user_id: acting_user.id) .group(:domain, :post_id) .count .each_key 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.staged? || acting_user.has_trust_level?(TrustLevel[1])) total_hosts_usage.values.any? { |count| count >= SiteSetting.newuser_spam_host_threshold } 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.summary(topic_id=nil) # PERF: if you pass in nil it is WAY slower # pg chokes getting a reasonable plan topic_id = topic_id ? topic_id.to_i : "posts.topic_id" # percent rank has tons of ties where(["post_number = 1 or id in ( SELECT p1.id FROM posts p1 WHERE p1.percent_rank <= ? AND p1.topic_id = #{topic_id} ORDER BY p1.percent_rank LIMIT ? )", SiteSetting.summary_percent_filter.to_f / 100.0, SiteSetting.summary_max_results ]) 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 external_id "#{topic_id}/#{post_number}" end def reply_to_post return if reply_to_post_number.blank? @reply_to_post ||= Post.find_by("topic_id = :topic_id AND post_number = :post_number", topic_id: topic_id, post_number: reply_to_post_number) end def reply_notification_target return if reply_to_post_number.blank? Post.find_by("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).try(:user) end def self.excerpt(cooked, maxlength = nil, options = {}) maxlength ||= SiteSetting.post_excerpt_maxlength PrettyText.excerpt(cooked, maxlength, options) end # Strip out most of the markup def excerpt(maxlength = nil, options = {}) Post.excerpt(cooked, maxlength, options) end def is_first_post? post_number.blank? ? topic.try(:highest_post_number) == 0 : post_number == 1 end def is_flagged? post_actions.where(post_action_type_id: PostActionType.flag_types.values, deleted_at: nil).count != 0 end def has_active_flag? post_actions.active.where(post_action_type_id: PostActionType.flag_types.values).count != 0 end def unhide! self.update_attributes(hidden: false) self.topic.update_attributes(visible: true) if is_first_post? save(validate: false) publish_change_to_clients!(:acted) end def full_url "#{Discourse.base_url}#{url}" end def url if topic Post.url(topic.slug, topic.id, post_number) else "/404" end 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 end def revise(updated_by, changes={}, opts={}) PostRevisor.new(self).revise!(updated_by, changes, opts) end def self.rebake_old(limit) problems = [] Post.where('baked_version IS NULL OR baked_version < ?', BAKED_VERSION) .limit(limit).each do |p| begin p.rebake! rescue => e problems << {post: p, ex: e} end end problems end def rebake!(opts=nil) opts ||= {} new_cooked = cook(raw, topic_id: topic_id, invalidate_oneboxes: opts.fetch(:invalidate_oneboxes, false)) old_cooked = cooked update_columns(cooked: new_cooked, baked_at: Time.new, baked_version: BAKED_VERSION) # Extracts urls from the body TopicLink.extract_from(self) QuotedPost.extract_from(self) # make sure we trigger the post process trigger_post_process(true) publish_change_to_clients!(:rebaked) new_cooked != old_cooked end def set_owner(new_user, actor) return if user_id == new_user.id edit_reason = I18n.t('change_owner.post_revision_text', old_user: (self.user.username_lower rescue nil) || I18n.t('change_owner.deleted_user'), new_user: new_user.username_lower ) revise(actor, {raw: self.raw, user_id: new_user.id, edit_reason: edit_reason}, bypass_bump: true) if post_number == topic.highest_post_number topic.update_columns(last_post_user_id: new_user.id) end end before_create do PostCreator.before_create_tasks(self) end def self.estimate_posts_per_day val = $redis.get("estimated_posts_per_day") return val.to_i if val posts_per_day = Topic.listable_topics.secured.joins(:posts).merge(Post.created_since(30.days.ago)).count / 30 $redis.setex("estimated_posts_per_day", 1.day.to_i, posts_per_day.to_s) posts_per_day end # This calculates the geometric mean of the post timings and stores it along with # each post. def self.calculate_avg_time(min_topic_age=nil) retry_lock_error do builder = SqlBuilder.new("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*/") builder.where("x.topic_id = posts.topic_id AND x.post_number = posts.post_number AND (posts.avg_time <> (x.gmean / 1000)::int OR posts.avg_time IS NULL)") if min_topic_age builder.where("posts.topic_id IN (SELECT id FROM topics where bumped_at > :bumped_at)", bumped_at: min_topic_age) end builder.exec end end before_save do self.last_editor_id ||= user_id self.cooked = cook(raw, topic_id: topic_id) unless new_record? self.baked_at = Time.new self.baked_version = BAKED_VERSION end def advance_draft_sequence return if topic.blank? # could be deleted DraftSequence.next!(last_editor_id, topic.draft_key) end # TODO: move to post-analyzer? # Determine what posts are quoted by this post def extract_quoted_post_numbers temp_collector = [] # Create relationships for the quotes raw.scan(/\[quote=\"([^"]+)"\]/).each do |quote| args = parse_quote_into_arguments(quote) # If the topic attribute is present, ensure it's the same topic temp_collector << args[:post] unless (args[:topic].present? && topic_id != args[:topic]) end temp_collector.uniq! self.quoted_post_numbers = temp_collector self.quote_count = temp_collector.size end def save_reply_relationships 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 self.quoted_post_numbers.each do |p| post = Post.find_by(topic_id: topic_id, post_number: p) create_reply_relationship_with(post) end end # Enqueue post processing for this post def trigger_post_process(bypass_bump = false) args = { post_id: id, bypass_bump: bypass_bump } args[:image_sizes] = image_sizes if image_sizes.present? args[:invalidate_oneboxes] = true if invalidate_oneboxes.present? args[:cooking_options] = self.cooking_options Jobs.enqueue(:process_post, args) DiscourseEvent.trigger(:after_trigger_post_process, self) end def self.public_posts_count_per_day(start_date, end_date, category_id=nil) result = public_posts.where('posts.created_at >= ? AND posts.created_at <= ?', start_date, end_date) result = result.where('topics.category_id = ?', category_id) if category_id result.group('date(posts.created_at)').order('date(posts.created_at)').count end def self.private_messages_count_per_day(start_date, end_date, topic_subtype) private_posts.with_topic_subtype(topic_subtype).where('posts.created_at >= ? AND posts.created_at <= ?', start_date, end_date).group('date(posts.created_at)').order('date(posts.created_at)').count end def reply_history(max_replies=100, guardian=nil) post_ids = Post.exec_sql("WITH RECURSIVE breadcrumb(id, reply_to_post_number) AS ( SELECT p.id, p.reply_to_post_number FROM posts AS p WHERE p.id = :post_id UNION SELECT p.id, p.reply_to_post_number FROM posts AS p, breadcrumb WHERE breadcrumb.reply_to_post_number = p.post_number AND p.topic_id = :topic_id ) SELECT id from breadcrumb ORDER by id", post_id: id, topic_id: topic_id).to_a post_ids.map! {|r| r['id'].to_i } .reject! {|post_id| post_id == id} # [1,2,3][-10,-1] => nil post_ids = (post_ids[(0-max_replies)..-1] || post_ids) Post.secured(guardian).where(id: post_ids).includes(:user, :topic).order(:id).to_a end def revert_to(number) return if number >= version post_revision = PostRevision.find_by(post_id: id, number: (number + 1)) post_revision.modifications.each do |attribute, change| attribute = "version" if attribute == "cached_version" write_attribute(attribute, change[0]) end end def self.rebake_all_quoted_posts(user_id) return if user_id.blank? Post.exec_sql <<-SQL WITH user_quoted_posts AS ( SELECT post_id FROM quoted_posts WHERE quoted_post_id IN (SELECT id FROM posts WHERE user_id = #{user_id}) ) UPDATE posts SET baked_version = NULL WHERE baked_version IS NOT NULL AND id IN (SELECT post_id FROM user_quoted_posts) SQL end def seen?(user) PostTiming.where(topic_id: topic_id, post_number: post_number, user_id: user.id).exists? end private def parse_quote_into_arguments(quote) return {} unless quote.present? args = HashWithIndifferentAccess.new quote.first.scan(/([a-z]+)\:(\d+)/).each do |arg| args[arg[0]] = arg[1].to_i end args end 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 if Topic.visible_post_types.include?(self.post_type) Post.where(id: post.id).update_all ['reply_count = reply_count + 1'] end end end end # == Schema Information # # Table name: posts # # id :integer not null, primary key # user_id :integer # 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 # 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 # like_score :integer default(0), not null # deleted_by_id :integer # edit_reason :string # word_count :integer # version :integer default(1), not null # cook_method :integer default(1), not null # wiki :boolean default(FALSE), not null # baked_at :datetime # baked_version :integer # hidden_at :datetime # self_edits :integer default(0), not null # reply_quoted :boolean default(FALSE), not null # via_email :boolean default(FALSE), not null # raw_email :text # public_version :integer default(1), not null # action_code :string # # Indexes # # idx_posts_created_at_topic_id (created_at,topic_id) # 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 # index_posts_on_user_id_and_created_at (user_id,created_at) #