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# frozen_string_literal: true
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:
#
# Rails.application.config.session_store :cookie_store, key: '_your_app_session'
#
# Configure your secret key in config/secrets.yml:
#
# development:
# secret_key_base: 'secret key'
#
# To generate a secret key for an existing application, run `rails 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 the secret key will invalidate all existing sessions!
#
# Because CookieStore extends Rack::Session::Abstract::Persisted, many of the
# options described there can be used to customize the session cookie that
# is generated. For example:
#
# Rails.application.config.session_store :cookie_store, expire_after: 14.days
#
# would set the session cookie to expire automatically 14 days after creation.
# Other useful options include <tt>:key</tt>, <tt>:secure</tt> and
# <tt>:httponly</tt>.
class CookieStore < AbstractStore
def initialize(app, options = {})
super(app, options.merge!(cookie_only: true))
end
def delete_session(req, session_id, options)
new_sid = generate_sid unless options[:drop]
# Reset hash and Assign the new session id
req.set_header("action_dispatch.request.unsigned_session_cookie", new_sid ? { "session_id" => new_sid } : {})
new_sid
end
def load_session(req)
stale_session_check! do
data = unpacked_cookie_data(req)
data = persistent_session_id!(data)
[data["session_id"], data]
end
end
private
def extract_session_id(req)
stale_session_check! do
unpacked_cookie_data(req)["session_id"]
end
end
def unpacked_cookie_data(req)
req.fetch_header("action_dispatch.request.unsigned_session_cookie") do |k|
v = stale_session_check! do
if data = get_cookie(req)
data.stringify_keys!
end
data || {}
end
req.set_header k, v
end
end
def persistent_session_id!(data, sid = nil)
data ||= {}
data["session_id"] ||= sid || generate_sid
data
end
def write_session(req, sid, session_data, options)
session_data["session_id"] = sid
session_data
end
def set_cookie(request, session_id, cookie)
cookie_jar(request)[@key] = cookie
end
def get_cookie(req)
cookie_jar(req)[@key]
end
def cookie_jar(request)
request.cookie_jar.signed_or_encrypted
end
end
end
end
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