Extract callbacks and validations for Post

Move Post create callbacks to PostCreate
Extract Post validations
Move stripped_length_validator to lib/validators

lib/post_creator.rb

@@ -73,12 +73,37 @@ class PostCreator
     @post
   end
 
-
-  # Shortcut
   def self.create(user, opts)
     PostCreator.new(user, opts).create
   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?)
+    post.cooked ||= post.cook(post.raw, topic_id: post.topic_id)
+    post.sort_order = post.post_number
+    DiscourseEvent.trigger(:before_create_post, post)
+    post.last_version_at ||= Time.now
+  end
+
+  def self.after_create_tasks(post)
+    Rails.logger.info (">" * 30) + "#{post.no_bump} #{post.created_at}"
+    # 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
+    post.topic.update_attributes(attrs)
+
+    # Update topic user data
+    TopicUser.change(post.user,
+                     post.topic.id,
+                     posted: true,
+                     last_read_post_number: post.post_number,
+                     seen_post_count: post.post_number)
+  end
+
   protected
 
   def secure_group_ids(topic)