require_dependency 'distributed_memoizer' require_dependency 'file_helper' class StaticController < ApplicationController skip_before_action :check_xhr, :redirect_to_login_if_required skip_before_action :verify_authenticity_token, only: [:brotli_asset, :cdn_asset, :enter, :favicon, :service_worker_asset] skip_before_action :preload_json, only: [:brotli_asset, :cdn_asset, :enter, :favicon, :service_worker_asset] skip_before_action :handle_theme, only: [:brotli_asset, :cdn_asset, :enter, :favicon, :service_worker_asset] PAGES_WITH_EMAIL_PARAM = ['login', 'password_reset', 'signup'] def show return redirect_to(path '/') if current_user && (params[:id] == 'login' || params[:id] == 'signup') if SiteSetting.login_required? && current_user.nil? && ['faq', 'guidelines'].include?(params[:id]) return redirect_to path('/login') end map = { "faq" => { redirect: "faq_url", topic_id: "guidelines_topic_id" }, "tos" => { redirect: "tos_url", topic_id: "tos_topic_id" }, "privacy" => { redirect: "privacy_policy_url", topic_id: "privacy_topic_id" } } @page = params[:id] if map.has_key?(@page) site_setting_key = map[@page][:redirect] url = SiteSetting.send(site_setting_key) return redirect_to(url) unless url.blank? end # The /guidelines route ALWAYS shows our FAQ, ignoring the faq_url site setting. @page = 'faq' if @page == 'guidelines' # Don't allow paths like ".." or "/" or anything hacky like that @page.gsub!(/[^a-z0-9\_\-]/, '') if map.has_key?(@page) @topic = Topic.find_by_id(SiteSetting.send(map[@page][:topic_id])) raise Discourse::NotFound unless @topic title_prefix = if I18n.exists?("js.#{@page}") I18n.t("js.#{@page}") else @topic.title end @title = "#{title_prefix} - #{SiteSetting.title}" @body = @topic.posts.first.cooked @faq_overriden = !SiteSetting.faq_url.blank? render :show, layout: !request.xhr?, formats: [:html] return end if I18n.exists?("static.#{@page}") render html: I18n.t("static.#{@page}"), layout: !request.xhr?, formats: [:html] return end if PAGES_WITH_EMAIL_PARAM.include?(@page) && params[:email] cookies[:email] = { value: params[:email], expires: 1.day.from_now } end file = "static/#{@page}.#{I18n.locale}" file = "static/#{@page}.en" if lookup_context.find_all("#{file}.html").empty? file = "static/#{@page}" if lookup_context.find_all("#{file}.html").empty? if lookup_context.find_all("#{file}.html").any? render file, layout: !request.xhr?, formats: [:html] return end raise Discourse::NotFound end # This method just redirects to a given url. # It's used when an ajax login was successful but we want the browser to see # a post of a login form so that it offers to remember your password. def enter params.delete(:username) params.delete(:password) destination = path("/") if params[:redirect].present? && !params[:redirect].match(login_path) begin forum_uri = URI(Discourse.base_url) uri = URI(params[:redirect]) if uri.path.present? && (uri.host.blank? || uri.host == forum_uri.host) && uri.path !~ /\./ destination = uri.path destination = "#{uri.path}?#{uri.query}" if uri.path =~ /new-topic/ || uri.path =~ /new-message/ || uri.path =~ /user-api-key/ end rescue URI::Error # Do nothing if the URI is invalid end end redirect_to destination end FAVICON ||= -"favicon" # We need to be able to draw our favicon on a canvas # and pull it off the canvas into a data uri # This can work by ensuring people set all the right CORS # settings in the CDN asset, BUT its annoying and error prone # instead we cache the favicon in redis and serve it out real quick with # a huge expiry, we also cache these assets in nginx so it bypassed if needed def favicon is_asset_path hijack do data = DistributedMemoizer.memoize(FAVICON + SiteSetting.site_favicon_url, 60 * 30) do begin file = FileHelper.download( UrlHelper.absolute(SiteSetting.site_favicon_url), max_file_size: 50.kilobytes, tmp_file_name: FAVICON, follow_redirect: true ) file ||= Tempfile.new([FAVICON, ".png"]) data = file.read file.unlink data rescue => e AdminDashboardData.add_problem_message('dashboard.bad_favicon_url', 1800) Rails.logger.debug("Invalid favicon_url #{SiteSetting.site_favicon_url}: #{e}\n#{e.backtrace}") "" end end if data.bytesize == 0 @@default_favicon ||= File.read(Rails.root + "public/images/default-favicon.png") response.headers["Content-Length"] = @@default_favicon.bytesize.to_s render body: @@default_favicon, content_type: "image/png" else immutable_for 1.year response.headers["Expires"] = 1.year.from_now.httpdate response.headers["Content-Length"] = data.bytesize.to_s response.headers["Last-Modified"] = Time.new('2000-01-01').httpdate render body: data, content_type: "image/png" end end end def brotli_asset is_asset_path serve_asset(".br") do response.headers["Content-Encoding"] = 'br' end end def cdn_asset is_asset_path serve_asset end def service_worker_asset is_asset_path respond_to do |format| format.js do # https://github.com/w3c/ServiceWorker/blob/master/explainer.md#updating-a-service-worker # Maximum cache that the service worker will respect is 24 hours. # However, ensure that these may be cached and served for longer on servers. immutable_for 1.year if Rails.application.assets_manifest.assets['service-worker.js'] path = File.expand_path(Rails.root + "public/assets/#{Rails.application.assets_manifest.assets['service-worker.js']}") response.headers["Last-Modified"] = File.ctime(path).httpdate end render( plain: Rails.application.assets_manifest.find_sources('service-worker.js').first, content_type: 'application/javascript' ) end end end protected def serve_asset(suffix = nil) path = File.expand_path(Rails.root + "public/assets/#{params[:path]}#{suffix}") # SECURITY what if path has /../ raise Discourse::NotFound unless path.start_with?(Rails.root.to_s + "/public/assets") response.headers["Expires"] = 1.year.from_now.httpdate response.headers["Access-Control-Allow-Origin"] = params[:origin] if params[:origin] begin response.headers["Last-Modified"] = File.ctime(path).httpdate rescue Errno::ENOENT begin if GlobalSetting.fallback_assets_path.present? path = File.expand_path("#{GlobalSetting.fallback_assets_path}/#{params[:path]}#{suffix}") response.headers["Last-Modified"] = File.ctime(path).httpdate else raise end rescue Errno::ENOENT expires_in 1.second, public: true, must_revalidate: false render plain: "can not find #{params[:path]}", status: 404 return end end response.headers["Content-Length"] = File.size(path).to_s yield if block_given? immutable_for 1.year # disable NGINX mucking with transfer request.env['sendfile.type'] = '' opts = { disposition: nil } opts[:type] = "application/javascript" if params[:path] =~ /\.js$/ send_file(path, opts) end end