Kali ini saya akan membahas bagaimana mengkonfigurasi phpCAS client pada Codeigniter 2.1.3. Caranya mudah kok untuk konfigurasi phpCAS ini. hehe.. Let's cekibrot bro

1. Pertama download dulu phpCAS yang ada pada resourcenya sono. hehe.. nihh phpCAS.
2. Setelah itu Ekstrak file tersebut masukkan ke application/libraries/.
3. Buat file yang bernama Cas.php pada direktori application/config/ dengan memasukkan kode berikut<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
   
   $config['cas_server_url'] = 'https://servercas.com/cas';
   
   $config['phpcas_path'] = 'CAS-1.3.2/';
   $config['cas_debug'] = TRUE;
   $config['cas_disable_server_validation'] = TRUE;Untuk konfigurasi server CAS nya sendiri dapat dilihat pada postingan saya sebelumnya di sini Konfigurasi CAS SERVER

1. Buat library file Cas.php pada direktori application/libraries/ dengan memasukkan kode berikut :<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
   
   function cas_show_config_error(){
   show_error("CAS authentication is not properly configured.<br /><br />
   Please, check your configuration for the following file:
   <code>config/cas.php</code>
   The minimum configuration requires:
   <ul>
   <li><em>cas_server_url</em>: the <strong>URL</strong> of your CAS server</li>
   <li><em>phpcas_path</em>: path to a installation of
   <a href=\"https://wiki.jasig.org/display/CASC/phpCAS\">phpCAS library</a></li>
   <li>and one of <em>cas_disable_server_validation</em> and <em>cas_ca_cert_file</em>.</li>
   </ul>
   ");
   }
   
   class Cas {
   
   public function __construct(){
   if (!function_exists('curl_init')){
   show_error('<strong>ERROR:</strong> You need to install the PHP module <strong>curl</strong>
   to be able to use CAS authentication.');
   }
   $CI =& get_instance();
   $this->CI = $CI;
   $CI->config->load('cas');
   
   $this->phpcas_path = $CI->config->item('phpcas_path');
   $this->cas_server_url = $CI->config->item('cas_server_url');
   
   if (empty($this->phpcas_path)
   or filter_var($this->cas_server_url, FILTER_VALIDATE_URL) === FALSE) {
   cas_show_config_error();
   }
   $cas_lib_file = $this->phpcas_path . '/CAS.php';
   if (!file_exists($cas_lib_file)){
   show_error("Could not find file: <code>" . $cas_lib_file. "</code>");
   }
   require_once $cas_lib_file;
   
   if ($CI->config->item('cas_debug')) {
   phpCAS::setDebug();
   }
   
   // init CAS client
   $defaults = array('path' => '', 'port' => 443);
   $cas_url = array_merge($defaults, parse_url($this->cas_server_url));
   
   phpCAS::client(CAS_VERSION_2_0, $cas_url['host'],
   $cas_url['port'], $cas_url['path']);
   
   // configures SSL behavior
   if ($CI->config->item('cas_disable_server_validation')){
   phpCAS::setNoCasServerValidation();
   } else {
   $ca_cert_file = $CI->config->item('cas_server_ca_cert');
   if (empty($ca_cert_file)) {
   cas_show_config_error();
   }
   phpCAS::setCasServerCACert($ca_cert_file);
   }
   }
   
   /**
   * Trigger CAS authentication if user is not yet authenticated.
   */
   public function force_auth()
   {
   phpCAS::forceAuthentication();
   }
   
   /**
   * Return an object with userlogin and attributes.
   * Shows aerror if called before authentication.
   */
   public function user()
   {
   if (phpCAS::isAuthenticated()) {
   $userlogin = phpCAS::getUser();
   $attributes = phpCAS::getAttributes();
   echo "has attributes? ";
   var_dump(phpCAS::hasAttributes());
   return (object) array('userlogin' => $userlogin,
   'attributes' => $attributes);
   } else {
   show_error("User was not authenticated yet.");
   }
   }
   
   /**
   * Logout and redirect to the main site URL,
   * or to the URL passed as argument
   */
   public function logout($url = '')
   {
   if (empty($url)) {
   $this->CI->load->helper('url');
   $url = base_url();
   }
   phpCAS::logoutWithRedirectService($url);
   }
   } 
2. Untuk mencobanya masukkan fungsi berikut ini pada controller :

function index() {
$this->load->library('cas');
$this->cas->force_auth();
$user = $this->cas->user();
echo "Hello, $user->userlogin!";
}

Selamat menikmati sajiannyaa...