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require 'active_support/core_ext/hash/keys'
require 'active_support/core_ext/object/blank'
module ActionDispatch
module Session
# This cookie-based session store is the Rails default. Sessions typically
# contain at most a user_id and flash message; both fit within the 4K cookie
# size limit. Cookie-based sessions are dramatically faster than the
# alternatives.
#
# If you have more than 4K of session data or don't want your data to be
# visible to the user, pick another session store.
#
# CookieOverflow is raised if you attempt to store more than 4K of data.
#
# A message digest is included with the cookie to ensure data integrity:
# a user cannot alter his +user_id+ without knowing the secret key
# included in the hash. New apps are generated with a pregenerated secret
# in config/environment.rb. Set your own for old apps you're upgrading.
#
# Session options:
#
# * <tt>:secret</tt>: An application-wide key string or block returning a
# string called per generated digest. The block is called with the
# CGI::Session instance as an argument. It's important that the secret
# is not vulnerable to a dictionary attack. Therefore, you should choose
# a secret consisting of random numbers and letters and more than 30
# characters. Examples:
#
# :secret => '449fe2e7daee471bffae2fd8dc02313d'
# :secret => Proc.new { User.current_user.secret_key }
#
# * <tt>:digest</tt>: The message digest algorithm used to verify session
# integrity defaults to 'SHA1' but may be any digest provided by OpenSSL,
# such as 'MD5', 'RIPEMD160', 'SHA256', etc.
#
# To generate a secret key for an existing application, run
# "rake secret" and set the key in config/environment.rb.
#
# Note that changing digest or secret invalidates all existing sessions!
class CookieStore < AbstractStore
def initialize(app, options = {})
super(app, options.merge!(:cookie_only => true))
freeze
end
private
def load_session(env)
data = unpacked_cookie_data(env)
data = persistent_session_id!(data)
[data["session_id"], data]
end
def extract_session_id(env)
if data = unpacked_cookie_data(env)
data["session_id"]
else
nil
end
end
def unpacked_cookie_data(env)
env["action_dispatch.request.unsigned_session_cookie"] ||= begin
request = ActionDispatch::Request.new(env)
if data = request.cookie_jar.signed[@key]
data.stringify_keys!
end
data || {}
end
end
def set_cookie(request, options)
request.cookie_jar.signed[@key] = options
end
def set_session(env, sid, session_data)
persistent_session_id!(session_data, sid)
end
def destroy(env)
# session data is stored on client; nothing to do here
end
def persistent_session_id!(data, sid=nil)
data ||= {}
data["session_id"] ||= sid || generate_sid
data
end
end
end
end
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