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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class PostCreator
attr_reader :errors, :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)
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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
# 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
# cooking_options - Options for rendering the text
#
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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
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def guardian
@guardian ||= Guardian.new(@user)
end
def create
@topic = nil
@post = nil
@new_topic = false
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Post.transaction do
setup_topic
setup_post
rollback_if_host_spam_detected
save_post
extract_links
store_unique_post_key
consider_clearing_flags
track_topic
update_topic_stats
update_user_counts
publish
ensure_in_allowed_users if guardian.is_staff?
@post.advance_draft_sequence
@post.save_reply_relationships
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end
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 && !@post.errors.present?
SpamRulesEnforcer.enforce!(@post)
end
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track_latest_on_category
enqueue_jobs
@post
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end
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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)
if post.reply_to_post_number.present?
post.reply_to_user_id ||= Post.select(:user_id).where(topic_id: post.topic_id, post_number: post.reply_to_post_number).first.try(:user_id)
end
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
DiscourseEvent.trigger(:before_create_post, post)
post.last_version_at ||= Time.now
end
protected
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def track_latest_on_category
if @post && @post.errors.count == 0 && @topic && @topic.category_id
Category.update_all( {latest_post_id: @post.id}, {id: @topic.category_id} )
if @post.post_number == 1
Category.update_all( {latest_topic_id: @topic.id}, {id: @topic.category_id} )
end
end
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
def secure_group_ids(topic)
@secure_group_ids ||= if topic.category && topic.category.read_restricted?
topic.category.secure_group_ids
end
end
def after_post_create
if !@topic.private_message? && @post.post_number > 1 && @post.post_type != Post.types[:moderator_action]
TopicTrackingState.publish_unread(@post)
end
end
def after_topic_create
# Don't publish invisible topics
return unless @topic.visible?
return if @topic.private_message? || @post.post_type == Post.types[:moderator_action]
@topic.posters = @topic.posters_summary
@topic.posts_count = 1
TopicTrackingState.publish_new(@topic)
end
def clear_possible_flags(topic)
# at this point we know the topic is a PM and has been replied to ... check if we need to clear any flags
#
first_post = Post.select(:id).where(topic_id: topic.id).where('post_number = 1').first
post_action = nil
if first_post
post_action = PostAction.where(
related_post_id: first_post.id,
deleted_at: nil,
post_action_type_id: PostActionType.types[:notify_moderators]
).first
end
if post_action
post_action.remove_act!(@user)
end
end
private
def setup_topic
if @opts[:topic_id].blank?
topic_creator = TopicCreator.new(@user, guardian, @opts)
begin
topic = topic_creator.create
@errors = topic_creator.errors
rescue ActiveRecord::Rollback => ex
# In the event of a rollback, grab the errors from the topic
@errors = topic_creator.errors
raise ex
end
@new_topic = true
else
topic = Topic.where(id: @opts[:topic_id]).first
guardian.ensure_can_create!(Post, topic)
end
@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
@topic.update_attributes(attrs)
end
def setup_post
post = @topic.posts.new(raw: @opts[:raw],
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].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?
@post = post
end
def rollback_if_host_spam_detected
if @post.has_host_spam?
@post.errors.add(:base, I18n.t(:spamming_host))
@errors = @post.errors
@spam = true
raise ActiveRecord::Rollback.new
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end
end
def save_post
unless @post.save(validate: !@opts[:skip_validations])
@errors = @post.errors
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raise ActiveRecord::Rollback.new
end
end
def store_unique_post_key
@post.store_unique_post_key
end
def consider_clearing_flags
if @topic.private_message? && @post.post_number > 1 && @topic.user_id != @post.user_id
clear_possible_flags(@topic)
end
end
def update_user_counts
# We don't count replies to your own topics
if @user.id != @topic.user_id
@user.user_stat.update_topic_reply_count
@user.user_stat.save!
end
@user.last_posted_at = @post.created_at
@user.save!
end
def publish
if @post.post_number > 1
MessageBus.publish("/topic/#{@post.topic_id}",{
id: @post.id,
created_at: @post.created_at,
user: BasicUserSerializer.new(@post.user).as_json(root: false),
post_number: @post.post_number
},
group_ids: secure_group_ids(@topic)
)
end
end
def extract_links
TopicLink.extract_from(@post)
end
def track_topic
unless @opts[:auto_track] == false
TopicUser.auto_track(@user.id, @topic.id, TopicUser.notification_reasons[:created_post])
# Update topic user data
TopicUser.change(@post.user.id,
@post.topic.id,
posted: true,
last_read_post_number: @post.post_number,
seen_post_count: @post.post_number)
end
end
def enqueue_jobs
if @post && !@post.errors.present?
# We need to enqueue jobs after the transaction. Otherwise they might begin before the data has
# been comitted.
topic_id = @opts[:topic_id] || @topic.try(:id)
Jobs.enqueue(:feature_topic_users, topic_id: @topic.id) if topic_id.present?
@post.trigger_post_process
after_post_create
after_topic_create if @new_topic
end
end
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end