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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.
#
# Your cookies will be encrypted using your apps secret_key_base. 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.
#
# Configure your session store in <tt>config/initializers/session_store.rb</tt>:
#
# Rails.application.config.session_store :cookie_store, key: '_your_app_session'
#
# By default, your secret key base is derived from your application name in
# the test and development environments. In all other environments, it is stored
# encrypted in the <tt>config/credentials.yml.enc</tt> file.
#
# If your application was not updated to Rails 5.2 defaults, the secret_key_base
# will be found in the old <tt>config/secrets.yml</tt> file.
#
# Note that changing your secret_key_base will invalidate all existing session.
# 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 changing it.
#
# 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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