require 'rack/utils' module ActionDispatch class FileHandler def initialize(root, cache_control) @root = root.chomp('/') @compiled_root = /^#{Regexp.escape(root)}/ headers = cache_control && { 'Cache-Control' => cache_control } @file_server = ::Rack::File.new(@root, headers) end def match?(path) path = path.dup full_path = path.empty? ? @root : File.join(@root, escape_glob_chars(clean_path_info(unescape_path(path)))) paths = "#{full_path}#{ext}" matches = Dir[paths] match = matches.detect { |m| File.file?(m) && File.readable?(m) } if match match.sub!(@compiled_root, '') ::Rack::Utils.escape(match) end end def call(env) @file_server.call(env) end def ext @ext ||= begin ext = ::ActionController::Base.page_cache_extension "{,#{ext},/index#{ext}}" end end def unescape_path(path) URI.parser.unescape(path) end def escape_glob_chars(path) path.force_encoding('binary') if path.respond_to? :force_encoding path.gsub(/[*?{}\[\]\\]/, "\\\\\\&") end private PATH_SEPS = Regexp.union(*[::File::SEPARATOR, ::File::ALT_SEPARATOR].compact) def clean_path_info(path_info) path_info.force_encoding('binary') if path_info.respond_to? :force_encoding parts = path_info.split PATH_SEPS clean = [] parts.each do |part| next if part.empty? || part == '.' part == '..' ? clean.pop : clean << part end clean.unshift '/' if parts.empty? || parts.first.empty? ::File.join(*clean) end end class Static def initialize(app, path, cache_control=nil) @app = app @file_handler = FileHandler.new(path, cache_control) end def call(env) case env['REQUEST_METHOD'] when 'GET', 'HEAD' path = env['PATH_INFO'].chomp('/') if match = @file_handler.match?(path) env["PATH_INFO"] = match return @file_handler.call(env) end end @app.call(env) end end end