require 'rack/utils' module Rails module Rack class Static FILE_METHODS = %w(GET HEAD).freeze def initialize(app) @app = app @file_server = ::Rack::File.new(File.join(RAILS_ROOT, "public")) end def call(env) path = env['PATH_INFO'].chomp('/') method = env['REQUEST_METHOD'] cached_path = (path.empty? ? 'index' : path) + ::ActionController::Base.page_cache_extension if FILE_METHODS.include?(method) if file_exist?(path) return @file_server.call(env) elsif file_exist?(cached_path) env['PATH_INFO'] = cached_path return @file_server.call(env) end end @app.call(env) end private def file_exist?(path) full_path = File.join(@file_server.root, ::Rack::Utils.unescape(path)) File.file?(full_path) && File.readable?(full_path) end end end end