require 'active_support/core_ext/hash/keys' require 'action_dispatch/middleware/session/abstract_store' require 'rack/session/cookie' module ActionDispatch module Session # This cookie-based session store is the Rails default. It is # dramatically faster than the alternatives. # # Sessions typically contain at most a user_id and flash message; both fit # within the 4K cookie size limit. A CookieOverflow exception is raised if # you attempt to store more than 4K of data. # # The cookie jar used for storage is automatically configured to be the # best possible option given your application's configuration. # # If you only have secret_token set, your cookies will be signed, but # not encrypted. This means a user cannot alter their +user_id+ without # knowing your app's secret key, but can easily read their +user_id+. This # was the default for Rails 3 apps. # # If you have secret_key_base set, your cookies will be encrypted. This # goes a step further than signed cookies in that encrypted cookies cannot # be altered or read by users. This is the default starting in Rails 4. # # If you have both secret_token and secret_key base set, your cookies will # be encrypted, and signed cookies generated by Rails 3 will be # transparently read and encrypted to provide a smooth upgrade path. # # Configure your session store in config/initializers/session_store.rb: # # Myapp::Application.config.session_store :cookie_store, key: '_your_app_session' # # Configure your secret key in config/initializers/secret_token.rb: # # Myapp::Application.config.secret_key_base 'secret key' # # To generate a secret key for an existing application, run `rake secret`. # # If you are upgrading an existing Rails 3 app, you should leave your # existing secret_token in place and simply add the new secret_key_base. # Note that you should wait to set secret_key_base until you have 100% of # your userbase on Rails 4 and are reasonably sure you will not need to # rollback to Rails 3. This is because cookies signed based on the new # secret_key_base in Rails 4 are not backwards compatible with Rails 3. # You are free to leave your existing secret_token in place, not set the # new secret_key_base, and ignore the deprecation warnings until you are # reasonably sure that your upgrade is otherwise complete. Additionally, # you should take care to make sure you are not relying on the ability to # decode signed cookies generated by your app in external applications or # Javascript before upgrading. # # Note that changing digest or secret invalidates all existing sessions! class CookieStore < Rack::Session::Abstract::ID include Compatibility include StaleSessionCheck include SessionObject def initialize(app, options={}) super(app, options.merge!(:cookie_only => true)) end def destroy_session(env, session_id, options) new_sid = generate_sid unless options[:drop] # Reset hash and Assign the new session id env["action_dispatch.request.unsigned_session_cookie"] = new_sid ? { "session_id" => new_sid } : {} new_sid end def load_session(env) stale_session_check! do data = unpacked_cookie_data(env) data = persistent_session_id!(data) [data["session_id"], data] end end private def extract_session_id(env) stale_session_check! do unpacked_cookie_data(env)["session_id"] end end def unpacked_cookie_data(env) env["action_dispatch.request.unsigned_session_cookie"] ||= begin stale_session_check! do if data = get_cookie(env) data.stringify_keys! end data || {} end end end def persistent_session_id!(data, sid=nil) data ||= {} data["session_id"] ||= sid || generate_sid data end def set_session(env, sid, session_data, options) session_data["session_id"] = sid session_data end def set_cookie(env, session_id, cookie) cookie_jar(env)[@key] = cookie end def get_cookie(env) cookie_jar(env)[@key] end def cookie_jar(env) request = ActionDispatch::Request.new(env) request.cookie_jar.signed_or_encrypted end end end end