--- /dev/null
+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']
+
+ if FILE_METHODS.include?(method)
+ if file_exist?(path)
+ return @file_server.call(env)
+ else
+ cached_path = directory_exist?(path) ? "#{path}/index" : path
+ cached_path += ::ActionController::Base.page_cache_extension
+
+ if file_exist?(cached_path)
+ env['PATH_INFO'] = cached_path
+ return @file_server.call(env)
+ end
+ 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
+
+ def directory_exist?(path)
+ full_path = File.join(@file_server.root, ::Rack::Utils.unescape(path))
+ File.directory?(full_path) && File.readable?(full_path)
+ end
+ end
+ end
+end