Class: Rack::Session::Cookie

Inherits:
Abstract::Persisted show all
Defined in:
lib/rack/session/cookie.rb

Overview

Rack::Session::Cookie provides simple cookie based session management. By default, the session is a Ruby Hash stored as base64 encoded marshalled data set to :key (default: rack.session). The object that encodes the session data is configurable and must respond to encode and decode. Both methods must take a string and return a string.

When the secret key is set, cookie data is checked for data integrity. The old secret key is also accepted and allows graceful secret rotation.

Example:

use Rack::Session::Cookie, :key => 'rack.session',
                           :domain => 'foo.com',
                           :path => '/',
                           :expire_after => 2592000,
                           :secret => 'change_me',
                           :old_secret => 'also_change_me'

All parameters are optional.

Example of a cookie with no encoding:

Rack::Session::Cookie.new(application, {
  :coder => Rack::Session::Cookie::Identity.new
})

Example of a cookie with custom encoding:

Rack::Session::Cookie.new(application, {
  :coder => Class.new {
    def encode(str); str.reverse; end
    def decode(str); str.reverse; end
  }.new
})

Defined Under Namespace

Classes: Base64, Identity

Constant Summary

Constants inherited from Abstract::Persisted

Abstract::Persisted::DEFAULT_OPTIONS

Instance Attribute Summary collapse

Attributes inherited from Abstract::Persisted

#default_options, #key, #sid_secure

Instance Method Summary collapse

Methods inherited from Abstract::Persisted

#call, #commit_session, #context

Constructor Details

#initialize(app, options = {}) ⇒ Cookie

Returns a new instance of Cookie.



106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
 
# File 'lib/rack/session/cookie.rb', line 106

def initialize(app, options={})
  @secrets = options.values_at(:secret, :old_secret).compact
  @hmac = options.fetch(:hmac, OpenSSL::Digest::SHA1)

  warn <<-MSG unless secure?(options)
  SECURITY WARNING: No secret option provided to Rack::Session::Cookie.
  This poses a security threat. It is strongly recommended that you
  provide a secret to prevent exploits that may be possible from crafted
  cookies. This will not be supported in future versions of Rack, and
  future versions will even invalidate your existing user cookies.

  Called from: #{caller[0]}.
  MSG
  @coder  = options[:coder] ||= Base64::Marshal.new
  super(app, options.merge!(:cookie_only => true))
end

Instance Attribute Details

#coder ⇒ Object (readonly)

Returns the value of attribute coder.



104
105
106
 
# File 'lib/rack/session/cookie.rb', line 104

def coder
  @coder
end