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require 'rack/utils'
require 'active_support/core_ext/uri'
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 = unescape_path(path)
return false unless path.valid_encoding?
full_path = path.empty? ? @root : File.join(@root,
clean_path_info(escape_glob_chars(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.default_static_extension
"{,#{ext},/index#{ext}}"
end
end
def unescape_path(path)
URI.parser.unescape(path)
end
def escape_glob_chars(path)
path.gsub(/[*?{}\[\]\\]/, "\\\\\\&")
end
private
PATH_SEPS = Regexp.union(*[::File::SEPARATOR, ::File::ALT_SEPARATOR].compact)
def clean_path_info(path_info)
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
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