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'
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require 'archetype'
require 'digest/sha1'
class Post < ActiveRecord::Base
include RateLimiter::OnCreateRecord
versioned if: :raw_changed?
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rate_limit
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acts_as_paranoid
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after_recover :update_flagged_posts_count
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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
validates_presence_of :raw, :user_id, :topic_id
validates :raw, stripped_length: { in: -> { SiteSetting.post_length } }
validate :raw_quality
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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)
scope :public_posts, -> { joins(:topic).where('topics.archetype <> ?', Archetype.private_message) }
scope :private_posts, -> { joins(:topic).where('topics.archetype = ?', Archetype.private_message) }
def self.hidden_reasons
@hidden_reasons ||= Enum.new(:flag_threshold_reached, :flag_threshold_reached_again)
end
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def self.types
@types ||= Enum.new(:regular, :moderator_action)
end
def raw_quality
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sentinel = TextSentinel.body_sentinel(raw)
errors.add(:raw, I18n.t(:is_invalid)) unless sentinel.valid?
end
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# Stop us from posting the same thing too quickly
def unique_post_validator
return if SiteSetting.unique_posts_mins == 0
return if acting_user.admin? || acting_user.moderator?
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# 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
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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 cooked_document
self.cooked ||= cook(raw, topic_id: topic_id)
@cooked_document ||= Nokogiri::HTML.fragment(cooked)
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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
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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
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end
def link_count
return 0 unless raw.present?
# Don't include @mentions in the link count
total = 0
cooked_document.search("a[href]").each do |l|
html_class = l.attributes['class']
if html_class.present?
next if html_class.to_s == 'mention' && l.attributes['href'].to_s =~ /^\/users\//
end
total +=1
end
total
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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
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def max_mention_validator
if acting_user.present? && acting_user.has_trust_level?(:basic)
errors.add(:base, I18n.t(:too_many_mentions, count: SiteSetting.max_mentions_per_post)) if raw_mentions.size > SiteSetting.max_mentions_per_post
else
errors.add(:base, I18n.t(:too_many_mentions_visitor, count: SiteSetting.visitor_max_mentions_per_post)) if raw_mentions.size > SiteSetting.visitor_max_mentions_per_post
end
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end
def max_images_validator
return if acting_user.present? && acting_user.has_trust_level?(:basic)
errors.add(:base, I18n.t(:too_many_images, count: SiteSetting.visitor_max_images)) if image_count > SiteSetting.visitor_max_images
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end
def max_links_validator
return if acting_user.present? && acting_user.has_trust_level?(:basic)
errors.add(:base, I18n.t(:too_many_links, count: SiteSetting.visitor_max_links)) if link_count > SiteSetting.visitor_max_links
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end
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def raw_mentions
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return [] if raw.blank?
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# We don't count mentions in quotes
return @raw_mentions if @raw_mentions.present?
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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
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results = doc.to_html.scan(PrettyText.mention_matcher)
@raw_mentions = results.uniq.map { |un| un.first.downcase.gsub!(/^@/, '') }
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
def self.excerpt(cooked, maxlength = nil)
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maxlength ||= SiteSetting.post_excerpt_maxlength
PrettyText.excerpt(cooked, maxlength)
end
# Strip out most of the markup
def excerpt(maxlength = nil)
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Post.excerpt(cooked, maxlength)
end
# What we use to cook posts
def cook(*args)
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cooked = PrettyText.cook(*args)
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# If we have any of the oneboxes in the cache, throw them in right away, don't
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# wait for the post processor.
dirty = false
result = Oneboxer.apply(cooked) do |url, elem|
Oneboxer.render_from_cache(url)
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end
cooked = result.to_html if result.changed?
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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 }
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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
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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
"/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
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# 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
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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
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DiscourseEvent.trigger(:before_create_post, self)
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self.last_version_at ||= Time.now
end
# TODO: Move some of this into an asynchronous job?
# TODO: Move into PostCreator
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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
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topic.update_attributes(attrs)
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# Update topic user data
TopicUser.change(user,
topic.id,
posted: true,
last_read_post_number: post_number,
seen_post_count: post_number)
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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
# Determine what posts are quoted by this post
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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]
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else
self.quoted_post_numbers << args[:post]
end
end
end
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self.quoted_post_numbers.uniq!
self.quote_count = quoted_post_numbers.size
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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
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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(sinceDaysAgo=30)
public_posts.where('posts.created_at > ?', sinceDaysAgo.days.ago).group('date(posts.created_at)').order('date(posts.created_at)').count
end
def self.private_messages_count_per_day(sinceDaysAgo=30)
private_posts.where('posts.created_at > ?', sinceDaysAgo.days.ago).group('date(posts.created_at)').order('date(posts.created_at)').count
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end
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end