discourse/app/controllers/static_controller.rb

260 lines
8.5 KiB
Ruby

# frozen_string_literal: true
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]
before_action :apply_cdn_headers, only: [:brotli_asset, :cdn_asset, :enter, :favicon, :service_worker_asset]
PAGES_WITH_EMAIL_PARAM = ['login', 'password_reset', 'signup']
MODAL_PAGES = ['password_reset', 'signup']
DEFAULT_PAGES = {
"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" },
}
CUSTOM_PAGES = {} # Add via `#add_topic_static_page` in plugin API
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 = DEFAULT_PAGES.deep_merge(CUSTOM_PAGES)
@page = params[:id]
if map.has_key?(@page)
site_setting_key = map[@page][:redirect]
url = SiteSetting.get(site_setting_key) if site_setting_key
return redirect_to(url) if url.present?
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 = @page.gsub(/[^a-z0-9\_\-]/, '')
if map.has_key?(@page)
topic_id = map[@page][:topic_id]
topic_id = instance_exec(&topic_id) if topic_id.is_a?(Proc)
@topic = Topic.find_by_id(SiteSetting.get(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_overridden = !SiteSetting.faq_url.blank?
render :show, layout: !request.xhr?, formats: [:html]
return
end
@title = SiteSetting.title.dup
if SiteSetting.short_site_description.present?
@title << " - #{SiteSetting.short_site_description}"
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
if lookup_context.find_all("static/#{@page}").any?
render "static/#{@page}", layout: !request.xhr?, formats: [:html]
return
end
if MODAL_PAGES.include?(@page)
render html: nil, layout: true
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("/")
redirect_location = params[:redirect]
if redirect_location.present? && !redirect_location.is_a?(String)
raise Discourse::InvalidParameters.new(:redirect)
elsif redirect_location.present? && !redirect_location.match(login_path)
begin
forum_uri = URI(Discourse.base_url)
uri = URI(redirect_location)
if uri.path.present? &&
(uri.host.blank? || uri.host == forum_uri.host) &&
uri.path !~ /\./
destination = "#{uri.path}#{uri.query ? "?#{uri.query}" : ""}"
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, this happens when you enable the feature
# that draws the notification count on top of favicon (per user default off)
#
# With s3 the original upload is going to be stored at s3, we don't have a local copy of the favicon.
# To allow canvas to work with s3 we are going to need to add special CORS headers and use
# a special crossorigin hint on the original, this is not easily workable.
#
# Forcing all consumers to set magic CORS headers on a CDN is also not workable for us.
#
# So 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 is bypassed if needed
def favicon
is_asset_path
hijack do
data = DistributedMemoizer.memoize("FAVICON#{SiteIconManager.favicon_url}", 60 * 30) do
favicon = SiteIconManager.favicon
next "" unless favicon
if Discourse.store.external?
begin
file = FileHelper.download(
Discourse.store.cdn_url(favicon.url),
max_file_size: favicon.filesize,
tmp_file_name: FAVICON,
follow_redirect: true
)
file&.read || ""
rescue => e
AdminDashboardData.add_problem_message('dashboard.bad_favicon_url', 1800)
Rails.logger.debug("Failed to fetch favicon #{favicon.url}: #{e}\n#{e.backtrace}")
""
ensure
file&.unlink
end
else
File.read(Rails.root.join("public", favicon.url[1..-1]))
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