discourse/app/models/post.rb

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require_dependency 'jobs'
require_dependency 'pretty_text'
require_dependency 'rate_limiter'
require_dependency 'post_revisor'
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require 'archetype'
require 'digest/sha1'
class Post < ActiveRecord::Base
include RateLimiter::OnCreateRecord
module HiddenReason
FLAG_THRESHOLD_REACHED = 1
FLAG_THRESHOLD_REACHED_AGAIN = 2
end
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versioned
rate_limit
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acts_as_paranoid
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after_recover :update_flagged_posts_count
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after_destroy :update_flagged_posts_count
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belongs_to :user
belongs_to :topic, counter_cache: :posts_count
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.min_post_length..SiteSetting.max_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
# Post Types
REGULAR = 1
MODERATOR_ACTION = 2
before_save :extract_quoted_post_numbers
after_commit :feature_topic_users, on: :create
after_commit :trigger_post_process, on: :create
after_commit :email_private_message, on: :create
# Related to unique post tracking
after_commit :store_unique_post_key, on: :create
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after_create do
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TopicUser.auto_track(self.user_id, self.topic_id, TopicUser::NotificationReasons::CREATED_POST)
end
def raw_quality
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sentinel = TextSentinel.new(self.raw, min_entropy: SiteSetting.body_min_entropy)
if sentinel.valid?
# It's possible the sentinel has cleaned up the title a bit
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self.raw = sentinel.text
else
errors.add(:raw, I18n.t(:is_invalid)) unless sentinel.valid?
end
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 user.admin? or user.has_trust_level?(: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
# On successful post, store a hash key to prevent the same post from happening again
def store_unique_post_key
return if SiteSetting.unique_posts_mins == 0
$redis.setex(unique_post_key, SiteSetting.unique_posts_mins.minutes.to_i, "1")
end
# The key we use in reddit to ensure unique posts
def unique_post_key
"post-#{user_id}:#{raw_hash}"
end
def raw_hash
return nil if raw.blank?
Digest::SHA1.hexdigest(raw.gsub(/\s+/, "").downcase)
end
def cooked_document
self.cooked ||= cook(self.raw, topic_id: topic_id)
@cooked_document ||= Nokogiri::HTML.fragment(self.cooked)
end
def reset_cooked
@cooked_document = nil
self.cooked = nil
end
def self.white_listed_image_classes
@white_listed_image_classes ||= ['avatar']
end
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def image_count
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return 0 unless self.raw.present?
cooked_document.search("img").reject{ |t|
dom_class = t["class"]
if dom_class
(Post.white_listed_image_classes & dom_class.split(" ")).count > 0
else
false
end
}.count
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end
def link_count
return 0 unless self.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? and 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? and user.has_trust_level?(:basic)
errors.add(:raw, I18n.t(:too_many_links)) if link_count > 1
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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)
if results.present?
@raw_mentions = results.uniq.map {|un| un.first.downcase.gsub!(/^@/, '')}
else
@raw_mentions = []
end
end
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# The rules for deletion change depending on who is doing it.
def delete_by(deleted_by)
if deleted_by.has_trust_level?(:moderator)
# As a moderator, delete the post.
Post.transaction do
self.destroy
Topic.reset_highest(self.topic_id)
end
elsif deleted_by.id == self.user_id
# As the poster, make a revision that says deleted.
Post.transaction do
revise(deleted_by, I18n.t('js.post.deleted_by_author'), force_new_version: true)
update_column(:user_deleted, true)
end
end
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end
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
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where("(post_number = 1) or (score >= ?)", SiteSetting.best_of_score_threshold)
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end
def update_flagged_posts_count
PostAction.update_flagged_posts_count
end
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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, '')
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if raw[parent_raw] or (parent_raw.size < SHORT_POST_CHARS)
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) and (reply_to_post_number.present?)
end
# Get the post that we reply to.
def reply_to_user
return nil unless reply_to_post_number.present?
User.where('id = (select user_id from posts where topic_id = ? and post_number = ?)', topic_id, reply_to_post_number).first
end
def reply_notification_target
return nil unless reply_to_post_number.present?
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reply_post = Post.where("topic_id = :topic_id AND post_number = :post_number AND user_id <> :user_id",
topic_id: topic_id,
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post_number: reply_to_post_number,
user_id: user_id).first
return reply_post.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)
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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
doc = Oneboxer.each_onebox_link(cooked) do |url, elem|
cached = Oneboxer.render_from_cache(url)
if cached.present?
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elem.swap(cached.cooked)
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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.name, created_at: created_at}
versions.order(:number).includes(:user).each do |v|
result << {number: v.number, display_username: v.user.name, created_at: v.created_at}
end
result
end
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def is_flagged?
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post_actions.where('post_action_type_id in (?) and deleted_at is null', PostActionType.FlagTypes).count != 0
end
def unhide!
self.hidden = false
self.hidden_reason_id = nil
self.topic.update_attributes(visible: true)
self.save
end
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def url
"/t/#{Slug.for(topic.title)}/#{topic.id}/#{post_number}"
end
def revise(updated_by, new_raw, opts={})
PostRevisor.new(self).revise!(updated_by, new_raw, opts)
end
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# Various callbacks
before_create do
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?
after_create do
# Update attributes on the topic - featured users and last posted.
attrs = {last_posted_at: self.created_at, last_post_user_id: self.user_id}
attrs[:bumped_at] = self.created_at unless no_bump
topic.update_attributes(attrs)
# Update the user's last posted at date
user.update_column(:last_posted_at, self.created_at)
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# Update topic user data
TopicUser.change(user,
topic.id,
posted: true,
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last_read_post_number: self.post_number,
seen_post_count: self.post_number)
end
def email_private_message
# send a mail to notify users in case of a private message
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if topic.private_message?
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topic.allowed_users.where(["users.email_private_messages = true and users.id != ?", self.user_id]).each do |u|
Jobs.enqueue_in(SiteSetting.email_time_window_mins.minutes, :user_email, type: :private_message, user_id: u.id, post_id: self.id)
end
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end
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end
def feature_topic_users
Jobs.enqueue(:feature_topic_users, topic_id: self.topic_id)
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
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self.last_editor_id ||= self.user_id
self.cooked = cook(raw, topic_id: topic_id) unless new_record?
end
before_destroy do
# Update the last post id to the previous post if it exists
last_post = Post.where("topic_id = ? and id <> ?", self.topic_id, self.id).order('created_at desc').limit(1).first
if last_post.present?
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topic.update_attributes(last_posted_at: last_post.created_at,
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last_post_user_id: last_post.user_id,
highest_post_number: last_post.post_number)
# If the poster doesn't have any other posts in the topic, clear their posted flag
unless Post.exists?(["topic_id = ? and user_id = ? and id <> ?", self.topic_id, self.user_id, self.id])
TopicUser.update_all 'posted = false', ['topic_id = ? and user_id = ?', self.topic_id, self.user_id]
end
end
# Feature users in the topic
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Jobs.enqueue(:feature_topic_users, topic_id: topic_id, except_post_id: self.id)
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end
after_destroy do
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# Remove any reply records that point to deleted posts
post_ids = PostReply.select(:post_id).where(reply_id: self.id).map(&:post_id)
PostReply.delete_all ["reply_id = ?", self.id]
if post_ids.present?
Post.where(id: post_ids).each {|p| p.update_column :reply_count, p.replies.count}
end
# Remove any notifications that point to this deleted post
Notification.delete_all ["topic_id = ? and post_number = ?", self.topic_id, self.post_number]
end
after_save do
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DraftSequence.next! self.last_editor_id, self.topic.draft_key if self.topic # could be deleted
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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! {|pid| pid.to_i}.uniq!
self.quoted_post_numbers.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: self.id)
if post_reply.save
Post.update_all ['reply_count = reply_count + 1'], id: post.id
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end
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end
end
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end
end
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 self.topic_id == args[:topic]
else
self.quoted_post_numbers << args[:post]
end
end
end
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self.quoted_post_numbers.uniq!
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self.quote_count = self.quoted_post_numbers.size
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end
# Process this post after comitting it
def trigger_post_process
args = {post_id: self.id}
args[:image_sizes] = self.image_sizes if self.image_sizes.present?
args[:invalidate_oneboxes] = true if self.invalidate_oneboxes.present?
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Jobs.enqueue(:process_post, args)
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end
end