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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 an optional 'Cache-Control' header 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 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)
@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, escape_glob_chars(path))
paths = "#{full_path}#{ext}"
matches = Dir[paths]
match = matches.detect { |m| File.file?(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
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)
@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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