discourse/app/controllers/static_controller.rb

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require_dependency 'distributed_memoizer'
require_dependency 'file_helper'
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class StaticController < ApplicationController
skip_before_filter :check_xhr, :redirect_to_login_if_required
skip_before_filter :verify_authenticity_token, only: [:cdn_asset, :enter, :favicon]
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PAGES_WITH_EMAIL_PARAM = ['login', 'password_reset', 'signup']
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def show
return redirect_to(path '/') if current_user && (params[:id] == 'login' || params[:id] == 'signup')
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]
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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'
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# Don't allow paths like ".." or "/" or anything hacky like that
@page.gsub!(/[^a-z0-9\_\-]/, '')
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if map.has_key?(@page)
@topic = Topic.find_by_id(SiteSetting.send(map[@page][:topic_id]))
raise Discourse::NotFound unless @topic
@title = @topic.title
@body = @topic.posts.first.cooked
@faq_overriden = !SiteSetting.faq_url.blank?
render :show, layout: !request.xhr?, formats: [:html]
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return
end
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if I18n.exists?("static.#{@page}")
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render text: I18n.t("static.#{@page}"), layout: !request.xhr?, formats: [:html]
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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
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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::InvalidURIError
# Do nothing if the URI is invalid
end
end
redirect_to destination
end
# 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
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data = DistributedMemoizer.memoize('favicon' + SiteSetting.favicon_url, 60*30) do
begin
file = FileHelper.download(SiteSetting.favicon_url, 50.kilobytes, "favicon.png", true)
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data = file.read
file.unlink
data
rescue => e
AdminDashboardData.add_problem_message('dashboard.bad_favicon_url', 1800)
Rails.logger.debug("Invalid favicon_url #{SiteSetting.favicon_url}: #{e}\n#{e.backtrace}")
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""
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 text: @@default_favicon, content_type: "image/png"
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else
expires_in 1.year, public: true
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 text: data, content_type: "image/png"
end
end
def cdn_asset
path = File.expand_path(Rails.root + "public/assets/" + params[:path])
# SECURITY what if path has /../
raise Discourse::NotFound unless path.start_with?(Rails.root.to_s + "/public/assets")
expires_in 1.year, public: true
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
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response.headers["Content-Length"] = File.size(path).to_s
rescue Errno::ENOENT
raise Discourse::NotFound
end
opts = { disposition: nil }
opts[:type] = "application/javascript" if path =~ /\.js$/
# we must disable acceleration otherwise NGINX strips
# access control headers
request.env['sendfile.type'] = ''
# TODO send_file chunks which kills caching, need to render text here
send_file(path, opts)
end
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end