discourse/app/controllers/robots_txt_controller.rb

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# frozen_string_literal: true
class RobotsTxtController < ApplicationController
layout false
skip_before_action :preload_json, :check_xhr, :redirect_to_login_if_required
OVERRIDDEN_HEADER = "# This robots.txt file has been customized at /admin/customize/robots\n"
# NOTE: order is important!
DISALLOWED_PATHS ||= %w{
/auth/
/assets/browser-update*.js
/email/
/session
/session/
/admin
/admin/
/user-api-key
/user-api-key/
/*?api_key*
/*?*api_key*
}
def index
if (overridden = SiteSetting.overridden_robots_txt.dup).present?
overridden.prepend(OVERRIDDEN_HEADER) if guardian.is_admin? && !is_api?
render plain: overridden
return
end
if SiteSetting.allow_index_in_robots_txt?
@robots_info = self.class.fetch_default_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
result = self.class.fetch_default_robots_info
overridden = SiteSetting.overridden_robots_txt
result[:overridden] = overridden if overridden.present?
render json: result
end
def self.fetch_default_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