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require 'action_dispatch/middleware/cookies'
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
DEFAULT_OPTIONS = {
:key => '_session_id',
:domain => nil,
:path => "/",
:expire_after => nil,
:httponly => true
}.freeze
class OptionsHash < Hash
def initialize(by, env, default_options)
@session_data = env[CookieStore::ENV_SESSION_KEY]
merge!(default_options)
end
def [](key)
key == :id ? @session_data[:session_id] : super(key)
end
end
ENV_SESSION_KEY = "rack.session".freeze
ENV_SESSION_OPTIONS_KEY = "rack.session.options".freeze
def initialize(app, options = {})
# Process legacy CGI options
# TODO Refactor and deprecate me
options = options.symbolize_keys
if options.has_key?(:session_path)
options[:path] = options.delete(:session_path)
end
if options.has_key?(:session_key)
options[:key] = options.delete(:session_key)
end
if options.has_key?(:session_http_only)
options[:httponly] = options.delete(:session_http_only)
end
@app = app
# The session_key option is required.
ensure_session_key(options[:key])
@key = options.delete(:key).freeze
@default_options = DEFAULT_OPTIONS.merge(options).freeze
freeze
end
def call(env)
env[ENV_SESSION_KEY] = AbstractStore::SessionHash.new(self, env)
env[ENV_SESSION_OPTIONS_KEY] = OptionsHash.new(self, env, @default_options)
status, headers, body = @app.call(env)
session_data = env[ENV_SESSION_KEY]
options = env[ENV_SESSION_OPTIONS_KEY]
if !session_data.is_a?(AbstractStore::SessionHash) || session_data.send(:loaded?) || options[:expire_after]
session_data.send(:load!) if session_data.is_a?(AbstractStore::SessionHash) && !session_data.send(:loaded?)
session_data = persistent_session_id!(session_data.to_hash)
cookie = { :value => session_data }
unless options[:expire_after].nil?
cookie[:expires] = Time.now + options.delete(:expire_after)
end
request = ActionDispatch::Request.new(env)
request.cookie_jar.signed[@key] = cookie.merge!(options)
end
[status, headers, body]
end
private
def load_session(env)
request = ActionDispatch::Request.new(env)
data = request.cookie_jar.signed[@key]
data = persistent_session_id!(data || {})
data.stringify_keys!
[data["session_id"], data]
end
def generate_sid
ActiveSupport::SecureRandom.hex(16)
end
def ensure_session_key(key)
if key.blank?
raise ArgumentError, 'A key is required to write a ' +
'cookie containing the session data. Use ' +
'config.session_store :cookie_store, { :key => ' +
'"_myapp_session" } in config/application.rb'
end
end
def persistent_session_id!(data)
(data ||= {}).merge!(inject_persistent_session_id(data))
end
def inject_persistent_session_id(data)
requires_session_id?(data) ? { "session_id" => generate_sid } : {}
end
def requires_session_id?(data)
if data
data.respond_to?(:key?) && !data.key?("session_id")
else
true
end
end
end
end
end
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