Weird way of how userhash is computed

[mudrd8mz]

I don't quite understand why are you accessing $_SESSION to get to the current sesskey value in the classes/deviceanalytics_data_storage_class.php. Is not simple sesskey() enough? Note that direct access to superglobals is discouraged in Moodle plugins code.

Also, why are you doing sha1(md5($usersession)); and then MD5 once again? Why not simple use sha1(sesskey()) as the session hash?