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<?php

/**

 * @file

 * Dummy module implementing a CAS Server.

 */

/**

 *

 */

function cas_test_cas_phpcas_alter() {

  // Set the User-Agent field which is used by SimpleTest to identify testing

  // requests.

  $test_info = &$GLOBALS['drupal_test_info'];

  if (!empty($test_info['test_run_id'])) {

    phpCAS::setExtraCurlOption(CURLOPT_USERAGENT, drupal_generate_test_ua($test_info['test_run_id']));

  }

  // Set all CAS server URLs manually, as this is the only way to specify an

  // HTTP (i.e., not HTTPS) connection.

  $service_url = phpCAS::getServiceURL();

  phpCAS::setServerLoginURL(url('cas_test/login', array(

    'query' => array('service' => $service_url),

    'absolute' => TRUE,

  )));

  switch (variable_get('cas_version', '2.0')) {

    case CAS_VERSION_1_0:

      phpCAS::setServerServiceValidateURL(url('cas_test/validate', array('absolute' => TRUE)));

      break;

    case CAS_VERSION_2_0:

      phpCAS::setServerServiceValidateURL(url('cas_test/serviceValidate', array('absolute' => TRUE)));

      phpCAS::setServerProxyValidateURL(url('cas_test/proxyValidate',  array('absolute' => TRUE)));

      break;

    default:

      throw new Exception('Unknown CAS server version.');

      break;

  }

  phpCAS::setServerLogoutURL(url('cas_test/logout',  array('absolute' => TRUE)));

  // SAML not currently implemented.

  // phpCAS::setServerSamlValidateURL(url('cas_test/samlValidate', array('absolute' => TRUE)));

}

/**

 * Implements hook_menu().

 */

function cas_test_menu() {

  $items = array();

  $items['cas_test/login'] = array(

    'page callback' => 'cas_test_login',

    'title' => 'CAS Login',

    'access callback' => TRUE,

    'type' => MENU_CALLBACK,

  );

  $items['cas_test/validate'] = array(

    'page callback' => 'cas_test_validate',

    'title' => 'CAS Validate',

    'access callback' => TRUE,

    'type' => MENU_CALLBACK,

  );

  $items['cas_test/serviceValidate'] = array(

    'page callback' => 'cas_test_service_validate',

    'title' => 'CAS Service Validate',

    'access callback' => TRUE,

    'type' => MENU_CALLBACK,

  );

  $items['cas_test/proxyValidate'] = array(

    'page callback' => 'cas_test_service_validate',

    'title' => 'CAS Proxy Ticket Validate',

    'access callback' => TRUE,

    'type' => MENU_CALLBACK,

  );

  $items['cas_test/logout'] = array(

    'page callback' => 'cas_test_logout',

    'title' => 'CAS Logout',

    'access callback' => TRUE,

    'type' => MENU_CALLBACK,

  );

  $items['cas_test/token'] = array(

    'page callback' => 'cas_test_token_evaluate',

    'title' => 'CAS Token Test',

    'access callback' => TRUE,

    'type' => MENU_CALLBACK,

  );

  return $items;

}

/**

 * Initiate a login request.

 *

 * Set the 'cas_test_cas_user' variable to an associative array containing:

 * - 'name': CAS username.

 * - 'attributes': (optional) Any other name-value pairs to be returned by the

 *   CAS server.

 */

function cas_test_login() {

  // Get the service and make a ticket.

  $service = $_REQUEST['service'];

  $cas_user = variable_get('cas_test_cas_user', '');

  if ($cas_user) {

    if (!is_array($cas_user)) {

      $cas_user = array('name' => $cas_user);

    }

    // Generate a ticket and redirect to the service URL with the login ticket.

    $ticket = _cas_test_ticket_generate($service, $cas_user);

    // Force redirection.

    unset($_GET['destination']);

    drupal_goto($service, array('query' => array('ticket' => $ticket)));

  }

  elseif (isset($_GET['gateway']) && $_GET['gateway'] == 'true') {

    // We were not able to log in the user, so redirect to the service URL.

    // Force redirection.

    unset($_GET['destination']);

    drupal_goto($service);

  }

  else {

    // No CAS name was provided, print an error message.

    print "Warning: No CAS name provided.\n";

    exit();

  }

}

/**

 * Validate a ticket using the CAS 1.x protocol.

 */

function cas_test_validate() {

  //Obtain the ticket from the url and validate it.

  $ticket = $_GET['ticket'];

  $service = $_GET['service'];

  $cas_user = _cas_test_ticket_validate($service, $ticket);

  if ($cas_user) {

    $cas_name = $cas_user['name'];

    print "yes\n";

    print "$cas_name\n";

  }

  else {

    print "no\n";

    print "\n";

  }

  exit();

}

/**

 * Validate a ticket using the CAS 2.0 protocol.

 */

function cas_test_service_validate() {

  $ticket = $_GET['ticket'];

  $service = $_GET['service'];

  header('Content-type:', 'text/xml');

  if ($cas_user = _cas_test_ticket_validate($service, $ticket)) {

    print theme('cas_service_validate_success', $cas_user);

  }

  else {

    $error_code = (!$ticket || !$service) ? 'INVALID_REQUEST' : 'INVALID_TICKET';

    print theme('cas_service_validate_failure', array('ticket' => $ticket, 'error_code' => $error_code));

  }

  exit();

}

/**

 * Log out a user.

 */

function cas_test_logout() {

  if (isset($_GET['url'])) {

    print t('Logged out. Continue to @url.', array('@url' => $_GET['url']));

  }

  else {

    print t('Logged out. No redirection provided.');

  }

  exit();

}

/**

 * Generate a login ticket.

 *

 * @param $service

 *   The service URL.

 * @param $cas_user

 *   An associative array containing the following keys:

 *     - 'name': The CAS username.

 *     - 'attributes': Any other key-value pairs the CAS server should return.

 *

 * @return

 *   A login ticket which may be used to authenticate the CAS username at the

 *   service URL.

 */

function _cas_test_ticket_generate($service, $cas_user) {

  // Generate a one-time ticket.

  $ticket = 'ST-' . user_password(32);

  // Save the ticket in the database.

  $tickets = variable_get('cas_test_tickets', array());

  $tickets[$service][$ticket] = $cas_user;

  variable_set('cas_test_tickets', $tickets);

  // Save the name in the database for single sign-out.

  $sso = variable_get('cas_test_sso', array());

  $sso[$cas_user['name']][$service][] = $ticket;

  variable_set('cas_test_sso', $sso);

  return $ticket;

}

/**

 * Validate a one-time-use login ticket.

 *

 * @param $service

 *   The service URL.

 * @param $ticket

 *   The login or proxy ticket.

 *

 * @return

 *   The CAS username corresponding to the ticket, or FALSE if the ticket is

 *   invalid.

 */

function _cas_test_ticket_validate($service, $ticket) {

  // Look up the ticket

  $cas_name = FALSE;

  $tickets = variable_get('cas_test_tickets', array());

  if (isset($tickets[$service][$ticket])) {

    $cas_name = $tickets[$service][$ticket];

    unset($tickets[$service][$ticket]);

  }

  return $cas_name;

}

/**

 * Sign out the specified CAS user.

 *

 * @param $cas_user

 */

function cas_test_single_sign_out($cas_name) {

  $sso = variable_get('cas_test_sso', array());

  foreach ($sso[$cas_name] as $service => $tickets) {

    foreach ($tickets as $ticket) {

      // Generate posting:

      $data = array(

        'logoutRequest' => t("<samlp:LogoutRequest ID=\"!id\" Version=\"2.0\" IssueInstant=\"!time\">\n<saml:NameID>@NOT_USED@</saml:NameID>\n<samlp:SessionIndex>!ticket</samlp:SessionIndex>\n</samlp:LogoutRequest>", array('!id' => user_password(10), '!time' => time(), '!ticket' => $ticket)),

      );

      // Sign out the user.

      $options = array(

        'method' => 'POST',

        'headers' => array(

          'Content-Type' => 'application/x-www-form-urlencoded',

        ),

        'data' => drupal_http_build_query($data),

      );

      drupal_http_request($service, $options);

    }

  }

  unset($sso[$cas_name]);

  variable_set('cas_test_sso', $sso);

}

/**

 * Evaluate the specified token.

 */

function cas_test_token_evaluate() {

  print token_replace($_GET['token'], array('cas' => $_GET['name']));

  exit(0);

}