How to let CAS handle session

Question

I am using the phpCAS library and would like sessions to be handled by that library.

I am instantiating the client this way:

function my_module_init(){
    ...
    phpCAS::client(CAS_VERSION_2_0,'casdomain' , 8443, '/cas',true);
    ...
}

I have it in hook_init() since I want to check for user authentication on each page load.

But I am getting this error.

phpCAS error: phpCAS::client(): Another session was started before phpcas. Either disable the session handling for phpcas in the client() call or modify your application to leave session handling to phpcas

How can I get rid of this error and have phpCAS handle the session?

Thanks.

Answer 1

Any reason why you are not using the module cas? It seems like a fairly stable module with over 5000 people using it. I would give that a shot before attempting any custom code in hook_init().

Answer 2

1. Create a copy of session.inc in your modules folder. I named my mymodule.session.inc.
2. In mymodule.session.inc find the function drupal_session_initialize() and replace drupal_session_start() with the call to the of the CAS client constructor.

3. In your module's .install file set the location of mymodule.session.inc file

   function mymodule_install() { variable_set('session_inc', 'path/mymodule_session.inc'); }

   function mymodule_uninstall() { variable_del('session_inc'); }

As a result Drupal will create the CAS client before any session is created.