class RobotsTxtController < ApplicationController layout false skip_before_action :preload_json, :check_xhr, :redirect_to_login_if_required # NOTE: order is important! DISALLOWED_PATHS ||= %w{ /auth/cas /auth/facebook/callback /auth/twitter/callback /auth/google/callback /auth/yahoo/callback /auth/github/callback /auth/cas/callback /assets/browser-update*.js /users/ /u/ /badges/ /search /search/ /tags /tags/ /email/ /session /session/ /admin /admin/ /user-api-key /user-api-key/ /*?api_key* /*?*api_key* /groups /groups/ /t/*/*.rss /tags/*.rss /c/*.rss } def index if SiteSetting.allow_index_in_robots_txt? @robots_info = fetch_robots_info render :index, content_type: 'text/plain' else render :no_index, content_type: 'text/plain' end end # If you are hosting Discourse in a subfolder, you will need to create your robots.txt # in the root of your web server with the appropriate paths. This method will return # JSON that can be used by a script to create a robots.txt that works well with your # existing site. def builder render json: fetch_robots_info end protected def fetch_robots_info deny_paths = DISALLOWED_PATHS.map { |p| Discourse.base_uri + p } deny_all = [ "#{Discourse.base_uri}/" ] result = { header: "# See http://www.robotstxt.org/robotstxt.html for documentation on how to use the robots.txt file", agents: [] } if SiteSetting.whitelisted_crawler_user_agents.present? SiteSetting.whitelisted_crawler_user_agents.split('|').each do |agent| result[:agents] << { name: agent, disallow: deny_paths } end result[:agents] << { name: '*', disallow: deny_all } elsif SiteSetting.blacklisted_crawler_user_agents.present? result[:agents] << { name: '*', disallow: deny_paths } SiteSetting.blacklisted_crawler_user_agents.split('|').each do |agent| result[:agents] << { name: agent, disallow: deny_all } end else result[:agents] << { name: '*', disallow: deny_paths } end if SiteSetting.slow_down_crawler_user_agents.present? SiteSetting.slow_down_crawler_user_agents.split('|').each do |agent| result[:agents] << { name: agent, delay: SiteSetting.slow_down_crawler_rate, disallow: deny_paths } end end result end end