Need help with hooks used for role based access

[eluser]Unknown[/eluser]
Hey all,

My plan is to use hooks(post controller) to see if the user has access to the uri. Basically I do this by checking session variables which I added myself.

The problem is that the first time the hook gets executed I havent added these user session variables yet.
Solved this by adding the !session_id statement. Followed by adding the user session variables, im not sure which one to use at this moment.
The hasAccess function looks at the first uri segment and checks if this segment is linked with the role the user has at that time (session variable). The array accessList contains this information.

Currently I have a infinite loop error once I enable hooks.

Code:

<?php

class Security {
  
    function Security()
    {
      $this->ci =& get_instance();
      
      if(!session_id())
      {
        $this->ci->load->library('session');
        //$_SESSION['userid'] = NULL;
        //$_SESSION['username'] = NULL;
        //$_SESSION['admin'] = NULL;
        //$_SESSION['logged_in'] = NULL;
        $this->ci->session->set_userdata('userid', NULL);
        $this->ci->session->set_userdata('username', NULL);
        $this->ci->session->set_userdata('admin', NULL);
        $this->ci->session->set_userdata('logged_in', FALSE);
      }
      $this->accessList = array('login' => '',
                                'admin' => 'adminRole',
                                'user' => 'userRole');     //role linked with uri
    
    
    }

    function HasAccess()
    {
      $requestedUrl = $this->ci->uri->segment(1);  // get the uri
      $role = '';
    
    if ($requestedUrl == "") $requestedUrl="login";  // if no uri then redirect to login
    
    if ($this->ci->session->userdata('logged_in'))  // if the user is logged in see what role he has
    {  
      if ($this->ci->session->userdata('admin') == 1)
      {
           $role = 'adminRole';
      }else
      {
           $role = 'userRole';
      }
    }
      
    //array_push($role, '');
      
    if (array_key_exists($requestedUrl, $this->accessList))  // check to see what uri's the role has access to
    {  
        if (in_array($this->accessList[$requestedUrl], $role))
        {
            //echo $requestedUrl;  //has access
        }else
        {
            redirect("login"); // doesnt have access redirect to login
        }
    }else show_error("URL not validated");
      
    }



}
?>

[eluser]Unknown[/eluser]
Ok i've been working on the code once again and located the part that causes the infinite loop. (added in the code)

Also i have reasons to believe that the session isnt properly initialized after the constructor. Tried to test this by using $this->ci->session->userdata('userid'); and then echoing it. Browser then notifies me that the session variable is a undefined instance.

Need help!!!!! How can i fix this...

Code:

<?php

class Security {
  
    function Security()
    {
      $this->ci =& get_instance();
      
      if(!$this->ci->session)
      {
        $this->ci->load->library('session');
        $this->ci->session->set_userdata('userid', NULL);
        $this->ci->session->set_userdata('username', NULL);
        $this->ci->session->set_userdata('admin', NULL);
        $this->ci->session->set_userdata('logged_in', FALSE);
      }
      $this->accessList = array('login' => '',
                                'admin' => 'adminRole',
                                'user' => 'userRole');
    }

    function HasAccess()
    {
      $requestedUrl = $this->ci->uri->segment(1);
      $role = '';
    
    if ($requestedUrl == "") $requestedUrl="login";
    
    if ($this->ci->session->userdata('logged_in'))
    {  
      if ($this->ci->session->userdata('admin') == 1)
      {
           $role = 'adminRole';
      }else
      {
           $role = 'userRole';
      }
    }
      
    //array_push($role, '');
      
    if (array_key_exists($requestedUrl, $this->accessList))
    {  

/******************************************************************
  This is where the infinite loop originates
******************************************************************/
      /*  if (in_array($this->accessList[$requestedUrl], $role))
        {
            //echo $requestedUrl;
        }else
        {
            redirect("login");
        }*/
    }else show_error("URL not validated");
      
    }



}
?>