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|
# -*- coding: UTF-8 -*-
#
require 'securerandom'
#
module Zorglub
#
class Node
#
def session
@session ||= Session.new @request, @response
end
end
#
class SessionHash
#
@data = {}
class << self
attr_reader :data
end
#
def initialize sid
@sid = sid
# TODO if sid is nil, one should be created
@session_data = SessionHash.data[sid]||={}
end
#
def exists?
not @sid.nil?
end
#
def [] idx
@session_data[idx]
end
#
def []= idx, v
@session_data[idx] = v
end
end
#
class Session
#
@key = 'zorglub.sid'
@kls = Zorglub::SessionHash
@sid_length = 64
#
class << self
attr_accessor :key, :kls, :sid_length
end
#
def initialize req, resp
@request = req
@response = resp
@instance = nil
end
#
def setup!
if Config.session_on
cookie = @request.cookies[Session.key]
if cookie.nil?
cookie = generate_sid
@response.set_cookie Session.key, cookie
end
@instance = Session.kls.new cookie
end
end
private :setup!
#
def exists?
setup! if @instance.nil?
@instance.exists?
end
#
def [] idx
setup! if @instance.nil?
@instance[idx]
end
#
def []= idx, v
setup! if @instance.nil?
@instance[idx] = v
end
#
def generate_sid
begin sid = sid_algorithm end while Session.kls.sid_exists? sid
sid
end
#
begin
require 'securerandom'
# Using SecureRandom, optional length.
# SecureRandom is available since Ruby 1.8.7.
# For Ruby versions earlier than that, you can require the uuidtools gem,
# which has a drop-in replacement for SecureRandom.
def sid_algorithm; SecureRandom.hex(Session.sid_length); end
rescue LoadError
require 'openssl'
# Using OpenSSL::Random for generation, this is comparable in performance
# with stdlib SecureRandom and also allows for optional length, it should
# have the same behaviour as the SecureRandom::hex method of the
# uuidtools gem.
def sid_algorithm
OpenSSL::Random.random_bytes(Session.sid_length / 2).unpack('H*')[0]
end
rescue LoadError
# Digest::SHA2::hexdigest produces a string of length 64, although
# collisions are not very likely, the entropy is still very low and
# length is not optional.
#
# Replacing it with OS-provided random data would take a lot of code and
# won't be as cross-platform as Ruby.
def sid_algorithm
entropy = [ srand, rand, Time.now.to_f, rand, $$, rand, object_id ]
Digest::SHA2.hexdigest(entropy.join)
end
end
#
end
#
end
#
# EOF
|
