diff options
Diffstat (limited to 'actionpack/lib/action_dispatch/middleware/static.rb')
-rw-r--r-- | actionpack/lib/action_dispatch/middleware/static.rb | 127 |
1 files changed, 98 insertions, 29 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/static.rb b/actionpack/lib/action_dispatch/middleware/static.rb index 2764584fe9..75f8e05a3f 100644 --- a/actionpack/lib/action_dispatch/middleware/static.rb +++ b/actionpack/lib/action_dispatch/middleware/static.rb @@ -2,66 +2,135 @@ require 'rack/utils' require 'active_support/core_ext/uri' module ActionDispatch + # This middleware returns a file's contents from disk in the body response. + # When initialized, it can accept optional HTTP headers, which will be set + # when a response containing a file's contents is delivered. + # + # This middleware will render the file specified in `env["PATH_INFO"]` + # where the base path is in the +root+ directory. For example, if the +root+ + # is set to `public/`, then a request with `env["PATH_INFO"]` of + # `assets/application.js` will return a response with the contents of a file + # located at `public/assets/application.js` if the file exists. If the file + # does not exist, a 404 "File not Found" response will be returned. class FileHandler - def initialize(root, cache_control) + def initialize(root, index: 'index', headers: {}) @root = root.chomp('/') @compiled_root = /^#{Regexp.escape(root)}/ - headers = cache_control && { 'Cache-Control' => cache_control } @file_server = ::Rack::File.new(@root, headers) + @index = index end + # Takes a path to a file. If the file is found, has valid encoding, and has + # correct read permissions, the return value is a URI-escaped string + # representing the filename. Otherwise, false is returned. + # + # Used by the `Static` class to check the existence of a valid file + # in the server's `public/` directory (see Static#call). def match?(path) - path = unescape_path(path) + path = ::Rack::Utils.unescape_path path return false unless path.valid_encoding? + path = Rack::Utils.clean_path_info path - full_path = path.empty? ? @root : File.join(@root, escape_glob_chars(path)) - paths = "#{full_path}#{ext}" + paths = [path, "#{path}#{ext}", "#{path}/#{@index}#{ext}"] - matches = Dir[paths] - match = matches.detect { |m| File.file?(m) } - if match - match.sub!(@compiled_root, '') - ::Rack::Utils.escape(match) + if match = paths.detect { |p| + path = File.join(@root, p.force_encoding('UTF-8'.freeze)) + begin + File.file?(path) && File.readable?(path) + rescue SystemCallError + false + end + + } + return ::Rack::Utils.escape_path(match) end end def call(env) - @file_server.call(env) + serve ActionDispatch::Request.new env end - def ext - @ext ||= begin - ext = ::ActionController::Base.default_static_extension - "{,#{ext},/index#{ext}}" + def serve(request) + path = request.path_info + gzip_path = gzip_file_path(path) + + if gzip_path && gzip_encoding_accepted?(request) + request.path_info = gzip_path + status, headers, body = @file_server.call(request.env) + if status == 304 + return [status, headers, body] + end + headers['Content-Encoding'] = 'gzip' + headers['Content-Type'] = content_type(path) + else + status, headers, body = @file_server.call(request.env) end - end - def unescape_path(path) - URI.parser.unescape(path) - end + headers['Vary'] = 'Accept-Encoding' if gzip_path - def escape_glob_chars(path) - path.gsub(/[*?{}\[\]]/, "\\\\\\&") + return [status, headers, body] + ensure + request.path_info = path end + + private + def ext + ::ActionController::Base.default_static_extension + end + + def content_type(path) + ::Rack::Mime.mime_type(::File.extname(path), 'text/plain'.freeze) + end + + def gzip_encoding_accepted?(request) + request.accept_encoding =~ /\bgzip\b/i + end + + def gzip_file_path(path) + can_gzip_mime = content_type(path) =~ /\A(?:text\/|application\/javascript)/ + gzip_path = "#{path}.gz" + if can_gzip_mime && File.exist?(File.join(@root, ::Rack::Utils.unescape_path(gzip_path))) + gzip_path + else + false + end + end end + # This middleware will attempt to return the contents of a file's body from + # disk in the response. If a file is not found on disk, the request will be + # delegated to the application stack. This middleware is commonly initialized + # to serve assets from a server's `public/` directory. + # + # This middleware verifies the path to ensure that only files + # living in the root directory can be rendered. A request cannot + # produce a directory traversal using this middleware. Only 'GET' and 'HEAD' + # requests will result in a file being returned. class Static - def initialize(app, path, cache_control=nil) + def initialize(app, path, deprecated_cache_control = :not_set, index: 'index', headers: {}) + if deprecated_cache_control != :not_set + ActiveSupport::Deprecation.warn("The `cache_control` argument is deprecated," \ + "replaced by `headers: { 'Cache-Control' => #{deprecated_cache_control} }`, " \ + " and will be removed in Rails 5.1.") + headers['Cache-Control'.freeze] = deprecated_cache_control + end + @app = app - @file_handler = FileHandler.new(path, cache_control) + @file_handler = FileHandler.new(path, index: index, headers: headers) end def call(env) - case env['REQUEST_METHOD'] - when 'GET', 'HEAD' - path = env['PATH_INFO'].chomp('/') + req = ActionDispatch::Request.new env + + if req.get? || req.head? + path = req.path_info.chomp('/'.freeze) if match = @file_handler.match?(path) - env["PATH_INFO"] = match - return @file_handler.call(env) + req.path_info = match + return @file_handler.serve(req) end end - @app.call(env) + @app.call(req.env) end end end |