discourse/lib/post_creator.rb

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# frozen_string_literal: true
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# Responsible for creating posts and topics
#
class PostCreator
include HasErrors
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attr_reader :opts
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# Acceptable options:
#
# raw - raw text of post
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# image_sizes - We can pass a list of the sizes of images in the post as a shortcut.
# invalidate_oneboxes - Whether to force invalidation of oneboxes in this post
# acting_user - The user performing the action might be different than the user
# who is the post "author." For example when copying posts to a new
# topic.
# created_at - Post creation time (optional)
# auto_track - Automatically track this topic if needed (default true)
# custom_fields - Custom fields to be added to the post, Hash (default nil)
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# post_type - Whether this is a regular post or moderator post.
# no_bump - Do not cause this post to bump the topic.
# cooking_options - Options for rendering the text
# cook_method - Method of cooking the post.
# :regular - Pass through Markdown parser and strip bad HTML
# :raw_html - Perform no processing
# :raw_email - Imported from an email
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# via_email - Mark this post as arriving via email
# raw_email - Full text of arriving email (to store)
# action_code - Describes a small_action post (optional)
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# skip_jobs - Don't enqueue jobs when creation succeeds. This is needed if you
# wrap `PostCreator` in a transaction, as the sidekiq jobs could
# dequeue before the commit finishes. If you do this, be sure to
# call `enqueue_jobs` after the transaction is comitted.
# hidden_reason_id - Reason for hiding the post (optional)
# skip_validations - Do not validate any of the content in the post
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#
# When replying to a topic:
# topic_id - topic we're replying to
# reply_to_post_number - post number we're replying to
#
# When creating a topic:
# title - New topic title
# archetype - Topic archetype
# is_warning - Is the topic a warning?
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# category - Category to assign to topic
# target_usernames - comma delimited list of usernames for membership (private message)
# target_group_names - comma delimited list of groups for membership (private message)
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# meta_data - Topic meta data hash
# created_at - Topic creation time (optional)
# pinned_at - Topic pinned time (optional)
# pinned_globally - Is the topic pinned globally (optional)
# shared_draft - Is the topic meant to be a shared draft
# topic_opts - Options to be overwritten for topic
#
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def initialize(user, opts)
# TODO: we should reload user in case it is tainted, should take in a user_id as opposed to user
# If we don't do this we introduce a rather risky dependency
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@user = user
@opts = opts || {}
opts[:title] = pg_clean_up(opts[:title]) if opts[:title] && opts[:title].include?("\u0000")
opts[:raw] = pg_clean_up(opts[:raw]) if opts[:raw] && opts[:raw].include?("\u0000")
opts.delete(:reply_to_post_number) unless opts[:topic_id]
opts[:visible] = false if opts[:visible].nil? && opts[:hidden_reason_id].present?
@guardian = opts[:guardian] if opts[:guardian]
@spam = false
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end
def pg_clean_up(str)
str.gsub("\u0000", "")
end
# True if the post was considered spam
def spam?
@spam
end
def skip_validations?
@opts[:skip_validations]
end
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def guardian
@guardian ||= Guardian.new(@user)
end
def valid?
@topic = nil
@post = nil
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if @user.suspended? && !skip_validations?
errors.add(:base, I18n.t(:user_is_suspended))
return false
end
if @opts[:target_usernames].present? && !skip_validations? && !@user.staff?
names = @opts[:target_usernames].split(',')
# Make sure max_allowed_message_recipients setting is respected
max_allowed_message_recipients = SiteSetting.max_allowed_message_recipients
if names.length > max_allowed_message_recipients
errors.add(
:base,
I18n.t(:max_pm_recepients, recipients_limit: max_allowed_message_recipients)
)
return false
end
# Make sure none of the users have muted the creator
users = User.where(username: names).pluck(:id, :username).to_h
User
.joins("LEFT JOIN user_options ON user_options.user_id = users.id")
.joins("LEFT JOIN muted_users ON muted_users.user_id = users.id AND muted_users.muted_user_id = #{@user.id.to_i}")
.joins("LEFT JOIN ignored_users ON ignored_users.user_id = users.id AND ignored_users.ignored_user_id = #{@user.id.to_i}")
.where("user_options.user_id IS NOT NULL")
.where("
(user_options.user_id IN (:user_ids) AND NOT user_options.allow_private_messages) OR
muted_users.user_id IN (:user_ids) OR
ignored_users.user_id IN (:user_ids)
", user_ids: users.keys)
.pluck(:id).each do |m|
errors.add(:base, I18n.t(:not_accepting_pms, username: users[m]))
end
return false if errors[:base].present?
end
if new_topic?
topic_creator = TopicCreator.new(@user, guardian, @opts)
return false unless skip_validations? || validate_child(topic_creator)
else
@topic = Topic.find_by(id: @opts[:topic_id])
unless @topic.present? && (@opts[:skip_guardian] || guardian.can_create?(Post, @topic))
errors.add(:base, I18n.t(:topic_not_found))
return false
end
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end
setup_post
return true if skip_validations?
if @post.has_host_spam?
@spam = true
errors.add(:base, I18n.t(:spamming_host))
return false
end
DiscourseEvent.trigger :before_create_post, @post
DiscourseEvent.trigger :validate_post, @post
post_validator = PostValidator.new(skip_topic: true)
post_validator.validate(@post)
valid = @post.errors.blank?
add_errors_from(@post) unless valid
valid
end
def create
if valid?
transaction do
build_post_stats
create_topic
create_post_notice
save_post
UserActionManager.post_created(@post)
extract_links
track_topic
update_topic_stats
update_topic_auto_close
update_user_counts
create_embedded_topic
link_post_uploads
update_uploads_secure_status
ensure_in_allowed_users if guardian.is_staff?
unarchive_message
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@post.advance_draft_sequence unless @opts[:import_mode]
@post.save_reply_relationships
end
end
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if @post && errors.blank? && !@opts[:import_mode]
store_unique_post_key
# update counters etc.
@post.topic.reload
publish
track_latest_on_category
enqueue_jobs unless @opts[:skip_jobs]
BadgeGranter.queue_badge_grant(Badge::Trigger::PostRevision, post: @post)
trigger_after_events unless opts[:skip_events]
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auto_close
end
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handle_spam if !opts[:import_mode] && (@post || @spam)
@post
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end
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def create!
create
if !self.errors.full_messages.empty?
raise ActiveRecord::RecordNotSaved.new(self.errors.full_messages.to_sentence)
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end
@post
end
def enqueue_jobs
return unless @post && !@post.errors.present?
PostJobsEnqueuer.new(@post, @topic, new_topic?,
import_mode: @opts[:import_mode],
post_alert_options: @opts[:post_alert_options]
).enqueue_jobs
end
def trigger_after_events
DiscourseEvent.trigger(:topic_created, @post.topic, @opts, @user) unless @opts[:topic_id]
DiscourseEvent.trigger(:post_created, @post, @opts, @user)
end
def self.track_post_stats
Rails.env != "test".freeze || @track_post_stats
end
def self.track_post_stats=(val)
@track_post_stats = val
end
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def self.create(user, opts)
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PostCreator.new(user, opts).create
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end
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def self.create!(user, opts)
PostCreator.new(user, opts).create!
end
def self.before_create_tasks(post)
set_reply_info(post)
post.word_count = post.raw.scan(/[[:word:]]+/).size
whisper = post.post_type == Post.types[:whisper]
increase_posts_count = !post.topic&.private_message? || post.post_type != Post.types[:small_action]
post.post_number ||= Topic.next_post_number(post.topic_id,
reply: post.reply_to_post_number.present?,
whisper: whisper,
post: increase_posts_count)
cooking_options = post.cooking_options || {}
cooking_options[:topic_id] = post.topic_id
post.cooked ||= post.cook(post.raw, cooking_options.symbolize_keys)
post.sort_order = post.post_number
post.last_version_at ||= Time.now
end
def self.set_reply_info(post)
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return unless post.reply_to_post_number.present?
# Before the locking here was added, replying to a post and liking a post
# at roughly the same time could cause a deadlock.
#
# Liking a post grabs an update lock on the post and then on the topic (to
# update like counts).
#
# Here, we lock the replied to post before getting the topic lock so that
# we can update the replied to post later without causing a deadlock.
reply_info = Post.where(topic_id: post.topic_id, post_number: post.reply_to_post_number)
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.select(:user_id, :post_type)
.lock
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.first
if reply_info.present?
post.reply_to_user_id ||= reply_info.user_id
whisper_type = Post.types[:whisper]
post.post_type = whisper_type if reply_info.post_type == whisper_type
end
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end
protected
def build_post_stats
if PostCreator.track_post_stats
draft_key = @topic ? "topic_#{@topic.id}" : "new_topic"
sequence = DraftSequence.current(@user, draft_key)
revisions = Draft.where(sequence: sequence,
user_id: @user.id,
draft_key: draft_key).pluck_first(:revisions) || 0
@post.build_post_stat(
drafts_saved: revisions,
typing_duration_msecs: @opts[:typing_duration_msecs] || 0,
composer_open_duration_msecs: @opts[:composer_open_duration_msecs] || 0
)
end
end
def auto_close
topic = @post.topic
is_private_message = topic.private_message?
topic_posts_count = @post.topic.posts_count
if is_private_message &&
!topic.closed &&
SiteSetting.auto_close_messages_post_count > 0 &&
SiteSetting.auto_close_messages_post_count <= topic_posts_count
@post.topic.update_status(
:closed, true, Discourse.system_user,
message: I18n.t(
'topic_statuses.autoclosed_message_max_posts',
count: SiteSetting.auto_close_messages_post_count
)
)
elsif !is_private_message &&
!topic.closed &&
SiteSetting.auto_close_topics_post_count > 0 &&
SiteSetting.auto_close_topics_post_count <= topic_posts_count
topic.update_status(
:closed, true, Discourse.system_user,
message: I18n.t(
'topic_statuses.autoclosed_topic_max_posts',
count: SiteSetting.auto_close_topics_post_count
)
)
end
end
def transaction(&blk)
if new_topic?
Post.transaction do
blk.call
end
else
# we need to ensure post_number is monotonically increasing with no gaps
# so we serialize creation to avoid needing rollbacks
DistributedMutex.synchronize("topic_id_#{@opts[:topic_id]}") do
Post.transaction do
blk.call
end
end
end
end
# You can supply an `embed_url` for a post to set up the embedded relationship.
# This is used by the wp-discourse plugin to associate a remote post with a
# discourse post.
def create_embedded_topic
return unless @opts[:embed_url].present?
embed = TopicEmbed.new(topic_id: @post.topic_id, post_id: @post.id, embed_url: @opts[:embed_url])
rollback_from_errors!(embed) unless embed.save
end
def link_post_uploads
disallowed_uploads = @post.link_post_uploads
if disallowed_uploads.is_a? Array
@post.errors.add(:base, I18n.t('secure_upload_not_allowed_in_public_topic', upload_filenames: disallowed_uploads.join(", ")))
rollback_from_errors!(@post)
end
end
def update_uploads_secure_status
@post.update_uploads_secure_status
end
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def handle_spam
if @spam
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GroupMessage.create(Group[:moderators].name,
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:spam_post_blocked,
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user: @user,
limit_once_per: 24.hours,
message_params: { domains: @post.linked_hosts.keys.join(', ') })
elsif @post && errors.blank? && !skip_validations?
SpamRule::FlagSockpuppets.new(@post).perform
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end
end
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def track_latest_on_category
return unless @post && @post.errors.count == 0 && @topic && @topic.category_id
Category.where(id: @topic.category_id).update_all(latest_post_id: @post.id)
Category.where(id: @topic.category_id).update_all(latest_topic_id: @topic.id) if @post.is_first_post?
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end
def ensure_in_allowed_users
return unless @topic.private_message? && @topic.id
unless @topic.topic_allowed_users.where(user_id: @user.id).exists?
unless @topic.topic_allowed_groups.where('group_id IN (
SELECT group_id FROM group_users where user_id = ?
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)', @user.id).exists?
@topic.topic_allowed_users.create!(user_id: @user.id)
end
end
end
def unarchive_message
return unless @topic.private_message? && @topic.id
UserArchivedMessage.where(topic_id: @topic.id).pluck(:user_id).each do |user_id|
UserArchivedMessage.move_to_inbox!(user_id, @topic)
end
GroupArchivedMessage.where(topic_id: @topic.id).pluck(:group_id).each do |group_id|
GroupArchivedMessage.move_to_inbox!(group_id, @topic)
end
end
private
def create_topic
return if @topic
begin
opts = @opts[:topic_opts] ? @opts.merge(@opts[:topic_opts]) : @opts
topic_creator = TopicCreator.new(@user, guardian, opts)
@topic = topic_creator.create
rescue ActiveRecord::Rollback
rollback_from_errors!(topic_creator)
end
@post.topic_id = @topic.id
@post.topic = @topic
if @topic && @topic.category && @topic.category.all_topics_wiki
@post.wiki = true
end
end
def update_topic_stats
attrs = { updated_at: Time.now }
if @post.post_type != Post.types[:whisper]
attrs[:last_posted_at] = @post.created_at
attrs[:last_post_user_id] = @post.user_id
attrs[:word_count] = (@topic.word_count || 0) + @post.word_count
attrs[:excerpt] = @post.excerpt_for_topic if new_topic?
attrs[:bumped_at] = @post.created_at unless @post.no_bump
@topic.update_columns(attrs)
end
@topic.update_columns(attrs)
end
def update_topic_auto_close
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return if @opts[:import_mode]
if @topic.closed?
@topic.delete_topic_timer(TopicTimer.types[:close])
else
topic_timer = @topic.public_topic_timer
if topic_timer &&
topic_timer.based_on_last_post &&
topic_timer.duration > 0
@topic.set_or_create_timer(TopicTimer.types[:close],
topic_timer.duration,
based_on_last_post: topic_timer.based_on_last_post
)
end
end
end
def setup_post
@opts[:raw] = TextCleaner.normalize_whitespaces(@opts[:raw] || '').gsub(/\s+\z/, "")
post = Post.new(raw: @opts[:raw],
topic_id: @topic.try(:id),
user: @user,
reply_to_post_number: @opts[:reply_to_post_number])
# Attributes we pass through to the post instance if present
[:post_type, :no_bump, :cooking_options, :image_sizes, :acting_user, :invalidate_oneboxes, :cook_method, :via_email, :raw_email, :action_code].each do |a|
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post.public_send("#{a}=", @opts[a]) if @opts[a].present?
end
post.extract_quoted_post_numbers
post.created_at = Time.zone.parse(@opts[:created_at].to_s) if @opts[:created_at].present?
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if fields = @opts[:custom_fields]
post.custom_fields = fields
end
if @opts[:hidden_reason_id].present?
post.hidden = true
post.hidden_at = Time.zone.now
post.hidden_reason_id = @opts[:hidden_reason_id]
end
@post = post
end
def save_post
@post.disable_rate_limits! if skip_validations?
@post.skip_validation = skip_validations?
saved = @post.save
rollback_from_errors!(@post) unless saved
end
def store_unique_post_key
@post.store_unique_post_key
end
def update_user_counts
return if @opts[:import_mode]
@user.create_user_stat if @user.user_stat.nil?
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if @user.user_stat.first_post_created_at.nil?
@user.user_stat.first_post_created_at = @post.created_at
end
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unless @post.topic.private_message?
@user.user_stat.post_count += 1 if @post.post_type == Post.types[:regular] && !@post.is_first_post?
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@user.user_stat.topic_count += 1 if @post.is_first_post?
end
# We don't count replies to your own topics
if !@opts[:import_mode] && @user.id != @topic.user_id
@user.user_stat.update_topic_reply_count
end
@user.user_stat.save!
if !@topic.private_message? && @post.post_type != Post.types[:whisper]
@user.update(last_posted_at: @post.created_at)
end
end
def create_post_notice
return if @opts[:import_mode] || @user.anonymous? || @user.bot? || @user.staged
last_post_time = Post.where(user_id: @user.id)
.order(created_at: :desc)
.limit(1)
.pluck(:created_at)
.first
if !last_post_time
@post.custom_fields["notice_type"] = Post.notices[:new_user]
elsif SiteSetting.returning_users_days > 0 && last_post_time < SiteSetting.returning_users_days.days.ago
@post.custom_fields["notice_type"] = Post.notices[:returning_user]
@post.custom_fields["notice_args"] = last_post_time.iso8601
end
end
def publish
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return if @opts[:import_mode] || @post.post_number == 1
@post.publish_change_to_clients! :created
end
def extract_links
TopicLink.extract_from(@post)
QuotedPost.extract_from(@post)
end
def track_topic
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return if @opts[:import_mode] || @opts[:auto_track] == false
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TopicUser.change(@post.user_id,
@topic.id,
posted: true,
last_read_post_number: @post.post_number,
highest_seen_post_number: @post.post_number)
# assume it took us 5 seconds of reading time to make a post
PostTiming.record_timing(topic_id: @post.topic_id,
user_id: @post.user_id,
post_number: @post.post_number,
msecs: 5000)
if @user.staged
TopicUser.auto_notification_for_staging(@user.id, @topic.id, TopicUser.notification_reasons[:auto_watch])
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elsif !@topic.private_message?
notification_level = @user.user_option.notification_level_when_replying || NotificationLevels.topic_levels[:tracking]
TopicUser.auto_notification(@user.id, @topic.id, TopicUser.notification_reasons[:created_post], notification_level)
end
end
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def new_topic?
@opts[:topic_id].blank?
end
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end