discourse/lib/post_creator.rb

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# Responsible for creating posts and topics
#
require_dependency 'rate_limiter'
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
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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)
# meta_data - Topic meta data hash
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
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@opts = opts
raise Discourse::InvalidParameters.new(:raw) if @opts[:raw].blank?
end
def guardian
@guardian ||= Guardian.new(@user)
end
def create
topic = nil
post = nil
Post.transaction do
if @opts[:topic_id].blank?
topic_params = {title: @opts[:title], user_id: @user.id, last_post_user_id: @user.id}
topic_params[:archetype] = @opts[:archetype] if @opts[:archetype].present?
topic_params[:subtype] = @opts[:subtype] if @opts[:subtype].present?
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guardian.ensure_can_create!(Topic)
category = Category.where(name: @opts[:category]).first
topic_params[:category_id] = category.id if category.present?
topic_params[:meta_data] = @opts[:meta_data] if @opts[:meta_data].present?
topic = Topic.new(topic_params)
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if @opts[:archetype] == Archetype.private_message
topic.subtype = TopicSubtype.user_to_user unless topic.subtype
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usernames = @opts[:target_usernames].split(',')
User.where(username: usernames).each do |u|
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unless guardian.can_send_private_message?(u)
topic.errors.add(:archetype, :cant_send_pm)
@errors = topic.errors
raise ActiveRecord::Rollback.new
end
topic.topic_allowed_users.build(user_id: u.id)
end
topic.topic_allowed_users.build(user_id: @user.id)
end
unless topic.save
@errors = topic.errors
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raise ActiveRecord::Rollback.new
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end
else
topic = Topic.where(id: @opts[:topic_id]).first
guardian.ensure_can_create!(Post, topic)
end
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post = topic.posts.new(raw: @opts[:raw],
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user: @user,
reply_to_post_number: @opts[:reply_to_post_number])
post.post_type = @opts[:post_type] if @opts[:post_type].present?
post.no_bump = @opts[:no_bump] if @opts[:no_bump].present?
post.extract_quoted_post_numbers
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post.image_sizes = @opts[:image_sizes] if @opts[:image_sizes].present?
post.invalidate_oneboxes = @opts[:invalidate_oneboxes] if @opts[:invalidate_oneboxes].present?
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unless post.save
@errors = post.errors
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raise ActiveRecord::Rollback.new
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end
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# Extract links
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TopicLink.extract_from(post)
# Store unique post key
if SiteSetting.unique_posts_mins > 0
$redis.setex(post.unique_post_key, SiteSetting.unique_posts_mins.minutes.to_i, "1")
end
# send a mail to notify users in case of a private message
if topic.private_message?
topic.allowed_users.where(["users.email_private_messages = true and users.id != ?", @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: post.id)
end
end
# Track the topic
TopicUser.auto_track(@user.id, topic.id, TopicUser.notification_reasons[:created_post])
if @user.id != topic.user_id
@user.update_topic_reply_count
end
@user.last_posted_at = post.created_at
@user.save!
# Publish the post in the message bus
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)
# Advance the draft sequence
post.advance_draft_sequence
# Save the quote relationships
post.save_reply_relationships
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end
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# 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 if post.present?
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post
end
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# Shortcut
def self.create(user, opts)
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PostCreator.new(user, opts).create
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end
end