discourse/lib/post_creator.rb

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# Responsible for creating posts and topics
#
require_dependency 'rate_limiter'
require_dependency 'topic_creator'
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require_dependency 'post_jobs_enqueuer'
require_dependency 'distributed_mutex'
require_dependency 'has_errors'
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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)
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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)
#
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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 || {}
@spam = false
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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[:base] << I18n.t(:user_is_suspended)
return false
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])
if (@topic.blank? || !guardian.can_create?(Post, @topic))
errors[: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[:base] << I18n.t(:spamming_host)
return false
end
DiscourseEvent.trigger :before_create_post, @post
DiscourseEvent.trigger :validate_post, @post
post_validator = Validators::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
create_topic
save_post
extract_links
store_unique_post_key
track_topic
update_topic_stats
update_topic_auto_close
update_user_counts
create_embedded_topic
ensure_in_allowed_users if guardian.is_staff?
@post.advance_draft_sequence
@post.save_reply_relationships
end
end
if @post && errors.blank?
publish
track_latest_on_category
enqueue_jobs
BadgeGranter.queue_badge_grant(Badge::Trigger::PostRevision, post: @post)
trigger_after_events(@post)
end
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if @post || @spam
handle_spam unless @opts[:import_mode]
end
@post
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end
def self.create(user, opts)
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PostCreator.new(user, opts).create
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end
def self.before_create_tasks(post)
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set_reply_user_id(post)
post.word_count = post.raw.scan(/\w+/).size
post.post_number ||= Topic.next_post_number(post.topic_id, post.reply_to_post_number.present?)
cooking_options = post.cooking_options || {}
cooking_options[:topic_id] = post.topic_id
post.cooked ||= post.cook(post.raw, cooking_options)
post.sort_order = post.post_number
post.last_version_at ||= Time.now
end
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def self.set_reply_user_id(post)
return unless post.reply_to_post_number.present?
post.reply_to_user_id ||= Post.select(:user_id).find_by(topic_id: post.topic_id, post_number: post.reply_to_post_number).try(:user_id)
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end
protected
def trigger_after_events(post)
DiscourseEvent.trigger(:topic_created, post.topic, @opts, @user) unless @opts[:topic_id]
DiscourseEvent.trigger(:post_created, post, @opts, @user)
end
def transaction(&blk)
Post.transaction do
if new_topic?
blk.call
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]}", &blk)
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?
TopicEmbed.create!(topic_id: @post.topic_id, post_id: @post.id, embed_url: @opts[:embed_url])
end
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def handle_spam
if @spam
GroupMessage.create( Group[:moderators].name,
:spam_post_blocked,
{ user: @user,
limit_once_per: 24.hours,
message_params: {domains: @post.linked_hosts.keys.join(', ')} } )
elsif @post && errors.blank? && !skip_validations?
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SpamRulesEnforcer.enforce!(@post)
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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?
unless @topic.topic_allowed_users.where(user_id: @user.id).exists?
@topic.topic_allowed_users.create!(user_id: @user.id)
end
end
private
def create_topic
return if @topic
begin
topic_creator = TopicCreator.new(@user, guardian, @opts)
@topic = topic_creator.create
rescue ActiveRecord::Rollback
add_errors_from(topic_creator)
return
end
@post.topic_id = @topic.id
@post.topic = @topic
end
def update_topic_stats
# Update attributes on the topic - featured users and last posted.
attrs = {last_posted_at: @post.created_at, last_post_user_id: @post.user_id}
attrs[:bumped_at] = @post.created_at unless @post.no_bump
attrs[:word_count] = (@topic.word_count || 0) + @post.word_count
attrs[:excerpt] = @post.excerpt(220, strip_links: true) if new_topic?
@topic.update_attributes(attrs)
end
def update_topic_auto_close
if @topic.auto_close_based_on_last_post && @topic.auto_close_hours
@topic.set_auto_close(@topic.auto_close_hours).save
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].each do |a|
post.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
@post = post
end
def save_post
@post.disable_rate_limits! if skip_validations?
saved = @post.save(validate: !skip_validations?)
rollback_from_errors!(@post) unless saved
end
def store_unique_post_key
@post.store_unique_post_key
end
def update_user_counts
@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
@user.user_stat.post_count += 1
@user.user_stat.topic_count += 1 if @post.is_first_post?
# 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!
@user.last_posted_at = @post.created_at
@user.save!
end
def publish
return if @opts[:import_mode]
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return unless @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[:auto_track] == false
TopicUser.change(@post.user_id,
@topic.id,
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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)
TopicUser.auto_track(@user.id, @topic.id, TopicUser.notification_reasons[:created_post])
end
def enqueue_jobs
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return unless @post && !@post.errors.present?
PostJobsEnqueuer.new(@post, @topic, new_topic?, {import_mode: @opts[:import_mode]}).enqueue_jobs
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end
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def new_topic?
@opts[:topic_id].blank?
end
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end