Adds a session handler that tries storing the session in an encrypted cookie when possible, and if not ( because the session is too large, or headers have already been set) stores it in the database.
This allows using SilverStripe on multiple servers without sticky sessions (as long as you solve other multi-server issues like asset storage and databases).
composer require silverstripe/hybridsessions:*
// Ensure that you define a sufficiently indeterminable
// value for SS_SESSION_KEY in your _ss_environment.php
As long as the key is unguessable and secret, generally this should be as secure as server-side-only cookies. The one exception is that cookie sessions are vulnerable to replay attacks. This is only a problem if you're storing stuff you shouldn't in the session anyway, but it's important you understand the issue. Ruby on rails has good documentation of the issue at http://guides.rubyonrails.org/security.html#replay-attacks-for-cookiestore-sessions
This module is not fully compatible with the testsession module, as the database store is not available prior to DB connectivity, which uses the session to dictate DB connections. Data smaller than 1000 bytes may still be stored via the cookie store, but larger data sets will be lost.
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