class ActionDispatch::FileHandler

does not exist, a 404 “File not Found” response will be returned.
located at ‘public/assets/application.js` if the file exists. If the file
`assets/application.js` will return a response with the contents of a file
is set to `public/`, then a request with `env` of
where the base path is in the root directory. For example, if the root
This middleware will render the file specified in `env`
when a response containing a file’s contents is delivered.
When initialized, it can accept optional HTTP headers, which will be set
This middleware returns a file’s contents from disk in the body response.

def call(env)

def call(env)
  serve(Rack::Request.new(env))
end

def content_type(path)

def content_type(path)
  ::Rack::Mime.mime_type(::File.extname(path), 'text/plain'.freeze)
end

def ext

def ext
  ::ActionController::Base.default_static_extension
end

def gzip_encoding_accepted?(request)

def gzip_encoding_accepted?(request)
  request.accept_encoding.any? { |enc, quality| enc =~ /\bgzip\b/i }
end

def gzip_file_path(path)

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

def initialize(root, index: 'index', headers: {})

def initialize(root, index: 'index', headers: {})
  @root          = root.chomp('/')
  @file_server   = ::Rack::File.new(@root, headers)
  @index         = index
end

def match?(path)

in the server's `public/` directory (see Static#call).
Used by the `Static` class to check the existence of a valid file

representing the filename. Otherwise, false is returned.
correct read permissions, the return value is a URI-escaped string
Takes a path to a file. If the file is found, has valid encoding, and has

def match?(path)
  path = ::Rack::Utils.unescape_path path
  return false unless valid_path?(path)
  path = Rack::Utils.clean_path_info path
  paths = [path, "#{path}#{ext}", "#{path}/#{@index}#{ext}"]
  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 serve(request)

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
  headers['Vary'] = 'Accept-Encoding' if gzip_path
  return [status, headers, body]
ensure
  request.path_info = path
end

def valid_path?(path)

def valid_path?(path)
  path.valid_encoding? && !path.include?("\0")
end

Modules

Classes