topics_controller.rb

require_dependency 'topic_view'
require_dependency 'promotion'

class TopicsController < ApplicationController

  # Avatar is an image request, not XHR
  before_filter :ensure_logged_in, only: [:timings,
                                          :destroy_timings,
                                          :update,
                                          :star,
                                          :destroy,
                                          :status,
                                          :invite,
                                          :mute,
                                          :unmute,
                                          :set_notifications,
                                          :move_posts]
  before_filter :consider_user_for_promotion, only: :show

  skip_before_filter :check_xhr, only: [:avatar, :show]
  caches_action :avatar, :cache_path => Proc.new {|c| "#{c.params[:post_number]}-#{c.params[:topic_id]}" }


  def show
    @topic_view = TopicView.new(params[:id] || params[:topic_id], current_user, params)

    anonymous_etag(@topic_view.topic) do
      redirect_to_correct_topic and return if slugs_do_not_match
      View.create_for(@topic_view.topic, request.remote_ip, current_user)
      track_visit_to_topic if should_track_visit_to_topic?
      topic_view_serializer = TopicViewSerializer.new(@topic_view, scope: guardian, root: false)

      respond_to do |format|
        format.html do
          @canonical = "#{request.protocol}#{request.host_with_port}" + @topic_view.topic.relative_url

          if params[:post_number]
            @post = @topic_view.posts.select{|p| p.post_number == params[:post_number].to_i}.first
            page = ((params[:post_number].to_i - 1) / SiteSetting.posts_per_page) + 1
            @canonical << "?page=#{page}" if page > 1
          else
            @canonical << "?page=#{params[:page]}" if params[:page] && params[:page].to_i > 1
          end

          last_post = @topic_view.posts[-1]
          if last_post.present? and (@topic_view.topic.highest_post_number > last_post.post_number)
            @next_page = (@topic_view.posts[0].post_number / SiteSetting.posts_per_page) + 2
          end

          store_preloaded("topic_#{@topic_view.topic.id}", MultiJson.dump(topic_view_serializer))
        end

        format.json do
          render_json_dump(topic_view_serializer)
        end

      end
    end

  end

  private

  def consider_user_for_promotion
    Promotion.new(current_user).review unless current_user.present?
  end

  def slugs_do_not_match
    params[:slug] && @topic_view.topic.slug != params[:slug]
  end

  def redirect_to_correct_topic
    fullpath = request.fullpath

    split = fullpath.split('/')
    split[2] = @topic_view.topic.slug

    redirect_to split.join('/'), status: 301
  end

  def track_visit_to_topic
    TopicUser.track_visit! @topic_view.topic, current_user
    @topic_view.draft = Draft.get(current_user, @topic_view.draft_key, @topic_view.draft_sequence)
  end

  def should_track_visit_to_topic?
    (!request.xhr? || params[:track_visit]) && current_user
  end
end