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<?php

/*

 * Copyright © 2003-2010, The ESUP-Portail consortium & the JA-SIG Collaborative.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *     * Redistributions of source code must retain the above copyright notice,

 *       this list of conditions and the following disclaimer.

 *     * Redistributions in binary form must reproduce the above copyright notice,

 *       this list of conditions and the following disclaimer in the documentation

 *       and/or other materials provided with the distribution.

 *     * Neither the name of the ESUP-Portail consortium & the JA-SIG

 *       Collaborative nor the names of its contributors may be used to endorse or

 *       promote products derived from this software without specific prior

 *       written permission.

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR

 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON

 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

//

// hack by Vangelis Haniotakis to handle the absence of $_SERVER['REQUEST_URI'] in IIS

//

if (php_sapi_name() != 'cli') {

	if (!isset($_SERVER['REQUEST_URI'])) {

		$_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['QUERY_STRING'];

	}

}

// Add a E_USER_DEPRECATED for php versions <= 5.2

if (!defined('E_USER_DEPRECATED')){

	define('E_USER_DEPRECATED', E_USER_NOTICE);

}

/**

 * @file CAS/CAS.php

 * Interface class of the phpCAS library

 *

 * @ingroup public

 */

// ########################################################################

//  CONSTANTS

// ########################################################################

// ------------------------------------------------------------------------

//  CAS VERSIONS

// ------------------------------------------------------------------------

/**

 * phpCAS version. accessible for the user by phpCAS::getVersion().

 */

define('PHPCAS_VERSION', '1.2.2');

// ------------------------------------------------------------------------

//  CAS VERSIONS

// ------------------------------------------------------------------------

/**

 * @addtogroup public

 * @{

 */

/**

 * CAS version 1.0

 */

define("CAS_VERSION_1_0", '1.0');

/*!

 * CAS version 2.0

 */

define("CAS_VERSION_2_0", '2.0');

// ------------------------------------------------------------------------

//  SAML defines

// ------------------------------------------------------------------------

/**

 * SAML protocol

 */

define("SAML_VERSION_1_1", 'S1');

/**

 * XML header for SAML POST

 */

define("SAML_XML_HEADER", '<?xml version="1.0" encoding="UTF-8"?>');

/**

 * SOAP envelope for SAML POST

 */

define("SAML_SOAP_ENV", '<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"><SOAP-ENV:Header/>');

/**

 * SOAP body for SAML POST

 */

define("SAML_SOAP_BODY", '<SOAP-ENV:Body>');

/**

 * SAMLP request

 */

define("SAMLP_REQUEST", '<samlp:Request xmlns:samlp="urn:oasis:names:tc:SAML:1.0:protocol"  MajorVersion="1" MinorVersion="1" RequestID="_192.168.16.51.1024506224022" IssueInstant="2002-06-19T17:03:44.022Z">');

define("SAMLP_REQUEST_CLOSE", '</samlp:Request>');

/**

 * SAMLP artifact tag (for the ticket)

 */

define("SAML_ASSERTION_ARTIFACT", '<samlp:AssertionArtifact>');

/**

 * SAMLP close

 */

define("SAML_ASSERTION_ARTIFACT_CLOSE", '</samlp:AssertionArtifact>');

/**

 * SOAP body close

 */

define("SAML_SOAP_BODY_CLOSE", '</SOAP-ENV:Body>');

/**

 * SOAP envelope close

 */

define("SAML_SOAP_ENV_CLOSE", '</SOAP-ENV:Envelope>');

/**

 * SAML Attributes

 */

define("SAML_ATTRIBUTES", 'SAMLATTRIBS');

/** @} */

/**

 * @addtogroup publicPGTStorage

 * @{

 */

// ------------------------------------------------------------------------

//  FILE PGT STORAGE

// ------------------------------------------------------------------------

/**

 * Default path used when storing PGT's to file

 */

define("CAS_PGT_STORAGE_FILE_DEFAULT_PATH", '/tmp');

/** @} */

// ------------------------------------------------------------------------

// SERVICE ACCESS ERRORS

// ------------------------------------------------------------------------

/**

 * @addtogroup publicServices

 * @{

 */

/**

 * phpCAS::service() error code on success

 */

define("PHPCAS_SERVICE_OK", 0);

/**

 * phpCAS::service() error code when the PT could not retrieve because

 * the CAS server did not respond.

 */

define("PHPCAS_SERVICE_PT_NO_SERVER_RESPONSE", 1);

/**

 * phpCAS::service() error code when the PT could not retrieve because

 * the response of the CAS server was ill-formed.

 */

define("PHPCAS_SERVICE_PT_BAD_SERVER_RESPONSE", 2);

/**

 * phpCAS::service() error code when the PT could not retrieve because

 * the CAS server did not want to.

 */

define("PHPCAS_SERVICE_PT_FAILURE", 3);

/**

 * phpCAS::service() error code when the service was not available.

 */

define("PHPCAS_SERVICE_NOT_AVAILABLE", 4);

// ------------------------------------------------------------------------

// SERVICE TYPES

// ------------------------------------------------------------------------

/**

 * phpCAS::getProxiedService() type for HTTP GET

 */

define("PHPCAS_PROXIED_SERVICE_HTTP_GET", 'CAS_ProxiedService_Http_Get');

/**

 * phpCAS::getProxiedService() type for HTTP POST

 */

define("PHPCAS_PROXIED_SERVICE_HTTP_POST", 'CAS_ProxiedService_Http_Post');

/**

 * phpCAS::getProxiedService() type for IMAP

 */

define("PHPCAS_PROXIED_SERVICE_IMAP", 'CAS_ProxiedService_Imap');

/** @} */

// ------------------------------------------------------------------------

//  LANGUAGES

// ------------------------------------------------------------------------

/**

 * @addtogroup publicLang

 * @{

 */

define("PHPCAS_LANG_ENGLISH", 'english');

define("PHPCAS_LANG_FRENCH", 'french');

define("PHPCAS_LANG_GREEK", 'greek');

define("PHPCAS_LANG_GERMAN", 'german');

define("PHPCAS_LANG_JAPANESE", 'japanese');

define("PHPCAS_LANG_SPANISH", 'spanish');

define("PHPCAS_LANG_CATALAN", 'catalan');

/** @} */

/**

 * @addtogroup internalLang

 * @{

 */

/**

 * phpCAS default language (when phpCAS::setLang() is not used)

 */

define("PHPCAS_LANG_DEFAULT", PHPCAS_LANG_ENGLISH);

/** @} */

// ------------------------------------------------------------------------

//  DEBUG

// ------------------------------------------------------------------------

/**

 * @addtogroup publicDebug

 * @{

 */

/**

 * The default directory for the debug file under Unix.

 */

define('DEFAULT_DEBUG_DIR', '/tmp/');

/** @} */

// ------------------------------------------------------------------------

//  MISC

// ------------------------------------------------------------------------

/**

 * @addtogroup internalMisc

 * @{

 */

/**

 * This global variable is used by the interface class phpCAS.

 *

 * @hideinitializer

 */

$GLOBALS['PHPCAS_CLIENT'] = null;

/**

 * This global variable is used to store where the initializer is called from

 * (to print a comprehensive error in case of multiple calls).

 *

 * @hideinitializer

 */

$GLOBALS['PHPCAS_INIT_CALL'] = array (

	'done' => FALSE,

	'file' => '?',

	'line' => -1,

	'method' => '?'

);

/**

 * This global variable is used to store where the method checking

 * the authentication is called from (to print comprehensive errors)

 *

 * @hideinitializer

 */

$GLOBALS['PHPCAS_AUTH_CHECK_CALL'] = array (

	'done' => FALSE,

	'file' => '?',

	'line' => -1,

	'method' => '?',

	'result' => FALSE

);

/**

 * This global variable is used to store phpCAS debug mode.

 *

 * @hideinitializer

 */

$GLOBALS['PHPCAS_DEBUG'] = array (

	'filename' => FALSE,

	'indent' => 0,

	'unique_id' => ''

);

/** @} */

// ########################################################################

//  CLIENT CLASS

// ########################################################################

// include client class

include_once (dirname(__FILE__) . '/CAS/Client.php');

// ########################################################################

//  INTERFACE CLASS

// ########################################################################

/**

 * @class phpCAS

 * The phpCAS class is a simple container for the phpCAS library. It provides CAS

 * authentication for web applications written in PHP.

 *

 * @ingroup public

 * @author Pascal Aubry <pascal.aubry at univ-rennes1.fr>

 *

 * \internal All its methods access the same object ($PHPCAS_CLIENT, declared

 * at the end of CAS/Client.php).

 */

class phpCAS {

	// ########################################################################

	//  INITIALIZATION

	// ########################################################################

	/**

	 * @addtogroup publicInit

	 * @{

	 */

	/**

	 * phpCAS client initializer.

	 * @note Only one of the phpCAS::client() and phpCAS::proxy functions should be

	 * called, only once, and before all other methods (except phpCAS::getVersion()

	 * and phpCAS::setDebug()).

	 *

	 * @param $server_version the version of the CAS server

	 * @param $server_hostname the hostname of the CAS server

	 * @param $server_port the port the CAS server is running on

	 * @param $server_uri the URI the CAS server is responding on

	 * @param $start_session Have phpCAS start PHP sessions (default true)

	 *

	 * @return a newly created CAS_Client object

	 */

	public static function client($server_version, $server_hostname, $server_port, $server_uri, $start_session = true) {

		global $PHPCAS_CLIENT, $PHPCAS_INIT_CALL;

		phpCAS :: traceBegin();

		if (is_object($PHPCAS_CLIENT)) {

			phpCAS :: error($PHPCAS_INIT_CALL['method'] . '() has already been called (at ' . $PHPCAS_INIT_CALL['file'] . ':' . $PHPCAS_INIT_CALL['line'] . ')');

		}

		if (gettype($server_version) != 'string') {

			phpCAS :: error('type mismatched for parameter $server_version (should be `string\')');

		}

		if (gettype($server_hostname) != 'string') {

			phpCAS :: error('type mismatched for parameter $server_hostname (should be `string\')');

		}

		if (gettype($server_port) != 'integer') {

			phpCAS :: error('type mismatched for parameter $server_port (should be `integer\')');

		}

		if (gettype($server_uri) != 'string') {

			phpCAS :: error('type mismatched for parameter $server_uri (should be `string\')');

		}

		// store where the initializer is called from

		$dbg = debug_backtrace();

		$PHPCAS_INIT_CALL = array (

			'done' => TRUE,

			'file' => $dbg[0]['file'],

			'line' => $dbg[0]['line'],

			'method' => __CLASS__ . '::' . __FUNCTION__

		);

		// initialize the global object $PHPCAS_CLIENT

		$PHPCAS_CLIENT = new CAS_Client($server_version, FALSE /*proxy*/

		, $server_hostname, $server_port, $server_uri, $start_session);

		phpCAS :: traceEnd();

	}

	/**

	 * phpCAS proxy initializer.

	 * @note Only one of the phpCAS::client() and phpCAS::proxy functions should be

	 * called, only once, and before all other methods (except phpCAS::getVersion()

	 * and phpCAS::setDebug()).

	 *

	 * @param $server_version the version of the CAS server

	 * @param $server_hostname the hostname of the CAS server

	 * @param $server_port the port the CAS server is running on

	 * @param $server_uri the URI the CAS server is responding on

	 * @param $start_session Have phpCAS start PHP sessions (default true)

	 *

	 * @return a newly created CAS_Client object

	 */

	public static function proxy($server_version, $server_hostname, $server_port, $server_uri, $start_session = true) {

		global $PHPCAS_CLIENT, $PHPCAS_INIT_CALL;

		phpCAS :: traceBegin();

		if (is_object($PHPCAS_CLIENT)) {

			phpCAS :: error($PHPCAS_INIT_CALL['method'] . '() has already been called (at ' . $PHPCAS_INIT_CALL['file'] . ':' . $PHPCAS_INIT_CALL['line'] . ')');

		}

		if (gettype($server_version) != 'string') {

			phpCAS :: error('type mismatched for parameter $server_version (should be `string\')');

		}

		if (gettype($server_hostname) != 'string') {

			phpCAS :: error('type mismatched for parameter $server_hostname (should be `string\')');

		}

		if (gettype($server_port) != 'integer') {

			phpCAS :: error('type mismatched for parameter $server_port (should be `integer\')');

		}

		if (gettype($server_uri) != 'string') {

			phpCAS :: error('type mismatched for parameter $server_uri (should be `string\')');

		}

		// store where the initialzer is called from

		$dbg = debug_backtrace();

		$PHPCAS_INIT_CALL = array (

			'done' => TRUE,

			'file' => $dbg[0]['file'],

			'line' => $dbg[0]['line'],

			'method' => __CLASS__ . '::' . __FUNCTION__

		);

		// initialize the global object $PHPCAS_CLIENT

		$PHPCAS_CLIENT = new CAS_Client($server_version, TRUE /*proxy*/

		, $server_hostname, $server_port, $server_uri, $start_session);

		phpCAS :: traceEnd();

	}

	/** @} */

	// ########################################################################

	//  DEBUGGING

	// ########################################################################

	/**

	 * @addtogroup publicDebug

	 * @{

	 */

	/**

	 * Set/unset debug mode

	 *

	 * @param $filename the name of the file used for logging, or FALSE to stop debugging.

	 */

	public static function setDebug($filename = '') {

		global $PHPCAS_DEBUG;

		if ($filename != FALSE && gettype($filename) != 'string') {

			phpCAS :: error('type mismatched for parameter $dbg (should be FALSE or the name of the log file)');

		}

		if ($filename === FALSE){

			unset($PHPCAS_DEBUG['filename']);

		}else{

			if (empty ($filename)) {

				if (preg_match('/^Win.*/', getenv('OS'))) {

					if (isset ($_ENV['TMP'])) {

						$debugDir = $_ENV['TMP'] . '/';

					} else

						if (isset ($_ENV['TEMP'])) {

							$debugDir = $_ENV['TEMP'] . '/';

						} else {

							$debugDir = '';

						}

				} else {

					$debugDir = DEFAULT_DEBUG_DIR;

				}

				$filename = $debugDir . 'phpCAS.log';

			}

			if (empty ($PHPCAS_DEBUG['unique_id'])) {

				$PHPCAS_DEBUG['unique_id'] = substr(strtoupper(md5(uniqid(''))), 0, 4);

			}

			$PHPCAS_DEBUG['filename'] = $filename;

			phpCAS :: trace('START phpCAS-' . PHPCAS_VERSION . ' ******************');

		}

	}

	/**

	 * Logs a string in debug mode.

	 *

	 * @param $str the string to write

	 *

	 * @private

	 */

	public static function log($str) {

		$indent_str = ".";

		global $PHPCAS_DEBUG;

		if ($PHPCAS_DEBUG['filename']) {

			for ($i = 0; $i < $PHPCAS_DEBUG['indent']; $i++) {

				$indent_str .= '|    ';

			}

			// allow for multiline output with proper identing. Usefull for dumping cas answers etc.

			$str2 = str_replace("\n", "\n" . $PHPCAS_DEBUG['unique_id'] . ' ' . $indent_str, $str);

			error_log($PHPCAS_DEBUG['unique_id'] . ' ' . $indent_str . $str2 . "\n", 3, $PHPCAS_DEBUG['filename']);

		}

	}

	/**

	 * This method is used by interface methods to print an error and where the function

	 * was originally called from.

	 *

	 * @param $msg the message to print

	 *

	 * @private

	 */

	public static function error($msg) {

		$dbg = debug_backtrace();

		$function = '?';

		$file = '?';

		$line = '?';

		if (is_array($dbg)) {

			for ($i = 1; $i < sizeof($dbg); $i++) {

				if (is_array($dbg[$i]) && isset($dbg[$i]['class']) ) {

					if ($dbg[$i]['class'] == __CLASS__) {

						$function = $dbg[$i]['function'];

						$file = $dbg[$i]['file'];

						$line = $dbg[$i]['line'];

					}

				}

			}

		}

		echo "<br />\n<b>phpCAS error</b>: <font color=\"FF0000\"><b>" . __CLASS__ . "::" . $function . '(): ' . htmlentities($msg) . "</b></font> in <b>" . $file . "</b> on line <b>" . $line . "</b><br />\n";

		phpCAS :: trace($msg);

		phpCAS :: traceExit();

		exit ();

	}

	/**

	 * This method is used to log something in debug mode.

	 */

	public static function trace($str) {

		$dbg = debug_backtrace();

		phpCAS :: log($str . ' [' . basename($dbg[0]['file']) . ':' . $dbg[0]['line'] . ']');

	}

	/**

	 * This method is used to indicate the start of the execution of a function in debug mode.

	 */

	public static function traceBegin() {

		global $PHPCAS_DEBUG;

		$dbg = debug_backtrace();

		$str = '=> ';

		if (!empty ($dbg[1]['class'])) {

			$str .= $dbg[1]['class'] . '::';

		}

		$str .= $dbg[1]['function'] . '(';

		if (is_array($dbg[1]['args'])) {

			foreach ($dbg[1]['args'] as $index => $arg) {

				if ($index != 0) {

					$str .= ', ';

				}

				if(is_object($arg)){

					$str .= get_class($arg);

				}else{

					$str .= str_replace(array("\r\n", "\n", "\r"), "", var_export($arg, TRUE));

				}

			}

		}

		if (isset($dbg[1]['file']))

		$file = basename($dbg[1]['file']);

		else

		$file = 'unknown_file';

		if (isset($dbg[1]['line']))

		$line = $dbg[1]['line'];

		else

		$line = 'unknown_line';

		$str .= ') [' . $file . ':' . $line . ']';

		phpCAS :: log($str);

		$PHPCAS_DEBUG['indent']++;

	}

	/**

	 * This method is used to indicate the end of the execution of a function in debug mode.

	 *

	 * @param $res the result of the function

	 */

	public static function traceEnd($res = '') {

		global $PHPCAS_DEBUG;

		$PHPCAS_DEBUG['indent']--;

		$dbg = debug_backtrace();

		$str = '';

		if(is_object($res)){

			$str .= '<= ' . get_class($arg);

		}else{

			$str .= '<= ' . str_replace(array("\r\n", "\n", "\r"), "", var_export($res, TRUE));

		}

		phpCAS :: log($str);

	}

	/**

	 * This method is used to indicate the end of the execution of the program

	 */

	public static function traceExit() {

		global $PHPCAS_DEBUG;

		phpCAS :: log('exit()');

		while ($PHPCAS_DEBUG['indent'] > 0) {

			phpCAS :: log('-');

			$PHPCAS_DEBUG['indent']--;

		}

	}

	/** @} */

	// ########################################################################

	//  INTERNATIONALIZATION

	// ########################################################################

	/**

	 * @addtogroup publicLang

	 * @{

	 */

	/**

	 * This method is used to set the language used by phpCAS.

	 * @note Can be called only once.

	 *

	 * @param $lang a string representing the language.

	 *

	 * @sa PHPCAS_LANG_FRENCH, PHPCAS_LANG_ENGLISH

	 */

	public static function setLang($lang) {

		global $PHPCAS_CLIENT;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		if (gettype($lang) != 'string') {

			phpCAS :: error('type mismatched for parameter $lang (should be `string\')');

		}

		$PHPCAS_CLIENT->setLang($lang);

	}

	/** @} */

	// ########################################################################

	//  VERSION

	// ########################################################################

	/**

	 * @addtogroup public

	 * @{

	 */

	/**

	 * This method returns the phpCAS version.

	 *

	 * @return the phpCAS version.

	 */

	public static function getVersion() {

		return PHPCAS_VERSION;

	}

	/** @} */

	// ########################################################################

	//  HTML OUTPUT

	// ########################################################################

	/**

	 * @addtogroup publicOutput

	 * @{

	 */

	/**

	 * This method sets the HTML header used for all outputs.

	 *

	 * @param $header the HTML header.

	 */

	public static function setHTMLHeader($header) {

		global $PHPCAS_CLIENT;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		if (gettype($header) != 'string') {

			phpCAS :: error('type mismatched for parameter $header (should be `string\')');

		}

		$PHPCAS_CLIENT->setHTMLHeader($header);

	}

	/**

	 * This method sets the HTML footer used for all outputs.

	 *

	 * @param $footer the HTML footer.

	 */

	public static function setHTMLFooter($footer) {

		global $PHPCAS_CLIENT;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		if (gettype($footer) != 'string') {

			phpCAS :: error('type mismatched for parameter $footer (should be `string\')');

		}

		$PHPCAS_CLIENT->setHTMLFooter($footer);

	}

	/** @} */

	// ########################################################################

	//  PGT STORAGE

	// ########################################################################

	/**

	 * @addtogroup publicPGTStorage

	 * @{

	 */

	/**

	 * This method can be used to set a custom PGT storage object.

	 *

	 * @param $storage a PGT storage object that inherits from the CAS_PGTStorage class

	 */

	public static function setPGTStorage($storage) {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_CLIENT->isProxy()) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if ($PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called before ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() (called at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ')');

		}

		if ( !($storage instanceof CAS_PGTStorage) ) {

			phpCAS :: error('type mismatched for parameter $storage (should be a CAS_PGTStorage `object\')');

		}

		$PHPCAS_CLIENT->setPGTStorage($storage);

		phpCAS :: traceEnd();

	}

	/**

	 * This method is used to tell phpCAS to store the response of the

	 * CAS server to PGT requests in a database.

	 *

	 * @param $dsn_or_pdo a dsn string to use for creating a PDO object or a PDO object

	 * @param $username the username to use when connecting to the database

	 * @param $password the password to use when connecting to the database

	 * @param $table the table to use for storing and retrieving PGT's

	 * @param $driver_options any driver options to use when connecting to the database

	 */

	public static function setPGTStorageDb($dsn_or_pdo, $username='', $password='', $table='', $driver_options=null) {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_CLIENT->isProxy()) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if ($PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called before ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() (called at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ')');

		}

		if (gettype($username) != 'string') {

			phpCAS :: error('type mismatched for parameter $username (should be `string\')');

		}

		if (gettype($password) != 'string') {

			phpCAS :: error('type mismatched for parameter $password (should be `string\')');

		}

		if (gettype($table) != 'string') {

			phpCAS :: error('type mismatched for parameter $table (should be `string\')');

		}

		$PHPCAS_CLIENT->setPGTStorageDb($dsn_or_pdo, $username, $password, $table, $driver_options);

		phpCAS :: traceEnd();

	}

	/**

	 * This method is used to tell phpCAS to store the response of the

	 * CAS server to PGT requests onto the filesystem.

	 * @param $format the format used to store the PGT's. This parameter has no effect and is only for backwards compatibility

	 * @param $path the path where the PGT's should be stored

	 */

	public static function setPGTStorageFile($format = '', $path = '') {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_CLIENT->isProxy()) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if ($PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called before ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() (called at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ')');

		}

		if (gettype($format) != 'string') {

			phpCAS :: error('type mismatched for parameter $format (should be `string\')');

		}

		if (gettype($path) != 'string') {

			phpCAS :: error('type mismatched for parameter $format (should be `string\')');

		}

		$PHPCAS_CLIENT->setPGTStorageFile($path);

		phpCAS :: traceEnd();

	}

	/** @} */

	// ########################################################################

	// ACCESS TO EXTERNAL SERVICES

	// ########################################################################

	/**

	 * @addtogroup publicServices

	 * @{

	 */

	/**

	 * Answer a proxy-authenticated service handler.

	 * 

	 * @param string $type The service type. One of:

	 *			PHPCAS_PROXIED_SERVICE_HTTP_GET

	 *			PHPCAS_PROXIED_SERVICE_HTTP_POST

	 *			PHPCAS_PROXIED_SERVICE_IMAP

	 *			

	 *		

	 * @return CAS_ProxiedService

	 * @throws InvalidArgumentException If the service type is unknown.

	 */

	public static function getProxiedService ($type) {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_CLIENT->isProxy()) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called after the programmer is sure the user has been authenticated (by calling ' . __CLASS__ . '::checkAuthentication() or ' . __CLASS__ . '::forceAuthentication()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['result']) {

			phpCAS :: error('authentication was checked (by ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ') but the method returned FALSE');

		}

		if (gettype($type) != 'string') {

			phpCAS :: error('type mismatched for parameter $type (should be `string\')');

		}

		$res = $PHPCAS_CLIENT->getProxiedService($type);

		phpCAS :: traceEnd();

		return $res;

	}

	/**

	 * Initialize a proxied-service handler with the proxy-ticket it should use.

	 * 

	 * @param CAS_ProxiedService $proxiedService

	 * @return void

	 * @throws CAS_ProxyTicketException If there is a proxy-ticket failure.

	 *		The code of the Exception will be one of: 

	 *			PHPCAS_SERVICE_PT_NO_SERVER_RESPONSE 

	 *			PHPCAS_SERVICE_PT_BAD_SERVER_RESPONSE

	 *			PHPCAS_SERVICE_PT_FAILURE

	 */

	public static function initializeProxiedService (CAS_ProxiedService $proxiedService) {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_CLIENT->isProxy()) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called after the programmer is sure the user has been authenticated (by calling ' . __CLASS__ . '::checkAuthentication() or ' . __CLASS__ . '::forceAuthentication()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['result']) {

			phpCAS :: error('authentication was checked (by ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ') but the method returned FALSE');

		}

		$PHPCAS_CLIENT->initializeProxiedService($proxiedService);

	}

	/**

	 * This method is used to access an HTTP[S] service.

	 *

	 * @param $url the service to access.

	 * @param $err_code an error code Possible values are PHPCAS_SERVICE_OK (on

	 * success), PHPCAS_SERVICE_PT_NO_SERVER_RESPONSE, PHPCAS_SERVICE_PT_BAD_SERVER_RESPONSE,

	 * PHPCAS_SERVICE_PT_FAILURE, PHPCAS_SERVICE_NOT_AVAILABLE.

	 * @param $output the output of the service (also used to give an error

	 * message on failure).

	 *

	 * @return TRUE on success, FALSE otherwise (in this later case, $err_code

	 * gives the reason why it failed and $output contains an error message).

	 */

	public static function serviceWeb($url, & $err_code, & $output) {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_CLIENT->isProxy()) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called after the programmer is sure the user has been authenticated (by calling ' . __CLASS__ . '::checkAuthentication() or ' . __CLASS__ . '::forceAuthentication()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['result']) {

			phpCAS :: error('authentication was checked (by ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ') but the method returned FALSE');

		}

		if (gettype($url) != 'string') {

			phpCAS :: error('type mismatched for parameter $url (should be `string\')');

		}

		$res = $PHPCAS_CLIENT->serviceWeb($url, $err_code, $output);

		phpCAS :: traceEnd($res);

		return $res;

	}

	/**

	 * This method is used to access an IMAP/POP3/NNTP service.

	 *

	 * @param $url a string giving the URL of the service, including the mailing box

	 * for IMAP URLs, as accepted by imap_open().

	 * @param $service a string giving for CAS retrieve Proxy ticket

	 * @param $flags options given to imap_open().

	 * @param $err_code an error code Possible values are PHPCAS_SERVICE_OK (on

	 * success), PHPCAS_SERVICE_PT_NO_SERVER_RESPONSE, PHPCAS_SERVICE_PT_BAD_SERVER_RESPONSE,

	 * PHPCAS_SERVICE_PT_FAILURE, PHPCAS_SERVICE_NOT_AVAILABLE.

	 * @param $err_msg an error message on failure

	 * @param $pt the Proxy Ticket (PT) retrieved from the CAS server to access the URL

	 * on success, FALSE on error).

	 *

	 * @return an IMAP stream on success, FALSE otherwise (in this later case, $err_code

	 * gives the reason why it failed and $err_msg contains an error message).

	 */

	public static function serviceMail($url, $service, $flags, & $err_code, & $err_msg, & $pt) {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_CLIENT->isProxy()) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called after the programmer is sure the user has been authenticated (by calling ' . __CLASS__ . '::checkAuthentication() or ' . __CLASS__ . '::forceAuthentication()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['result']) {

			phpCAS :: error('authentication was checked (by ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ') but the method returned FALSE');

		}

		if (gettype($url) != 'string') {

			phpCAS :: error('type mismatched for parameter $url (should be `string\')');

		}

		if (gettype($flags) != 'integer') {

			phpCAS :: error('type mismatched for parameter $flags (should be `integer\')');

		}

		$res = $PHPCAS_CLIENT->serviceMail($url, $service, $flags, $err_code, $err_msg, $pt);

		phpCAS :: traceEnd($res);

		return $res;

	}

	/** @} */

	// ########################################################################

	//  AUTHENTICATION

	// ########################################################################

	/**

	 * @addtogroup publicAuth

	 * @{

	 */

	/**

	 * Set the times authentication will be cached before really accessing the CAS server in gateway mode:

	 * - -1: check only once, and then never again (until you pree login)

	 * - 0: always check

	 * - n: check every "n" time

	 *

	 * @param $n an integer.

	 */

	public static function setCacheTimesForAuthRecheck($n) {

		global $PHPCAS_CLIENT;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		if (gettype($n) != 'integer') {

			phpCAS :: error('type mismatched for parameter $header (should be `string\')');

		}

		$PHPCAS_CLIENT->setCacheTimesForAuthRecheck($n);

	}

	/**

	 * Set a callback function to be run when a user authenticates.

	 *

	 * The callback function will be passed a $logoutTicket as its first parameter,

	 * followed by any $additionalArgs you pass. The $logoutTicket parameter is an

	 * opaque string that can be used to map the session-id to logout request in order

	 * to support single-signout in applications that manage their own sessions 

	 * (rather than letting phpCAS start the session).

	 *

	 * phpCAS::forceAuthentication() will always exit and forward client unless

	 * they are already authenticated. To perform an action at the moment the user

	 * logs in (such as registering an account, performing logging, etc), register

	 * a callback function here.

	 * 

	 * @param callback $function

	 * @param optional array $additionalArgs

	 * @return void

	 */

	public static function setPostAuthenticateCallback ($function, array $additionalArgs = array()) {

		global $PHPCAS_CLIENT;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		$PHPCAS_CLIENT->setPostAuthenticateCallback($function, $additionalArgs);

	}

	/**

	 * Set a callback function to be run when a single-signout request is received.

	 *

	 * The callback function will be passed a $logoutTicket as its first parameter,

	 * followed by any $additionalArgs you pass. The $logoutTicket parameter is an

	 * opaque string that can be used to map a session-id to the logout request in order

	 * to support single-signout in applications that manage their own sessions 

	 * (rather than letting phpCAS start and destroy the session).

	 * 

	 * @param callback $function

	 * @param optional array $additionalArgs

	 * @return void

	 */

	public static function setSingleSignoutCallback ($function, array $additionalArgs = array()) {

		global $PHPCAS_CLIENT;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		$PHPCAS_CLIENT->setSingleSignoutCallback($function, $additionalArgs);

	}

	/**

	 * This method is called to check if the user is already authenticated locally or has a global cas session. A already

	 * existing cas session is determined by a cas gateway call.(cas login call without any interactive prompt)

	 * @return TRUE when the user is authenticated, FALSE when a previous gateway login failed or

	 * the function will not return if the user is redirected to the cas server for a gateway login attempt

	 */

	public static function checkAuthentication() {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		$auth = $PHPCAS_CLIENT->checkAuthentication();

		// store where the authentication has been checked and the result

		$dbg = debug_backtrace();

		$PHPCAS_AUTH_CHECK_CALL = array (

			'done' => TRUE,

			'file' => $dbg[0]['file'],

			'line' => $dbg[0]['line'],

			'method' => __CLASS__ . '::' . __FUNCTION__,

			'result' => $auth

		);

		phpCAS :: traceEnd($auth);

		return $auth;

	}

	/**

	 * This method is called to force authentication if the user was not already

	 * authenticated. If the user is not authenticated, halt by redirecting to

	 * the CAS server.

	 */

	public static function forceAuthentication() {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		$auth = $PHPCAS_CLIENT->forceAuthentication();

		// store where the authentication has been checked and the result

		$dbg = debug_backtrace();

		$PHPCAS_AUTH_CHECK_CALL = array (

			'done' => TRUE,

			'file' => $dbg[0]['file'],

			'line' => $dbg[0]['line'],

			'method' => __CLASS__ . '::' . __FUNCTION__,

			'result' => $auth

		);

		if (!$auth) {

			phpCAS :: trace('user is not authenticated, redirecting to the CAS server');

			$PHPCAS_CLIENT->forceAuthentication();

		} else {

			phpCAS :: trace('no need to authenticate (user `' . phpCAS :: getUser() . '\' is already authenticated)');

		}

		phpCAS :: traceEnd();

		return $auth;

	}

	/**

	 * This method is called to renew the authentication.

	 **/

	public static function renewAuthentication() {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		$auth = $PHPCAS_CLIENT->renewAuthentication();

		// store where the authentication has been checked and the result

		$dbg = debug_backtrace();

		$PHPCAS_AUTH_CHECK_CALL = array (

			'done' => TRUE,

			'file' => $dbg[0]['file'],

			'line' => $dbg[0]['line'],

			'method' => __CLASS__ . '::' . __FUNCTION__,

			'result' => $auth

		);

		//$PHPCAS_CLIENT->renewAuthentication();

		phpCAS :: traceEnd();

	}

	/**

	 * This method is called to check if the user is authenticated (previously or by

	 * tickets given in the URL).

	 *

	 * @return TRUE when the user is authenticated.

	 */

	public static function isAuthenticated() {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		// call the isAuthenticated method of the global $PHPCAS_CLIENT object

		$auth = $PHPCAS_CLIENT->isAuthenticated();

		// store where the authentication has been checked and the result

		$dbg = debug_backtrace();

		$PHPCAS_AUTH_CHECK_CALL = array (

			'done' => TRUE,

			'file' => $dbg[0]['file'],

			'line' => $dbg[0]['line'],

			'method' => __CLASS__ . '::' . __FUNCTION__,

			'result' => $auth

		);

		phpCAS :: traceEnd($auth);

		return $auth;

	}

	/**

	 * Checks whether authenticated based on $_SESSION. Useful to avoid

	 * server calls.

	 * @return true if authenticated, false otherwise.

	 * @since 0.4.22 by Brendan Arnold

	 */

	public static function isSessionAuthenticated() {

		global $PHPCAS_CLIENT;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		return ($PHPCAS_CLIENT->isSessionAuthenticated());

	}

	/**

	 * This method returns the CAS user's login name.

	 * @warning should not be called only after phpCAS::forceAuthentication()

	 * or phpCAS::checkAuthentication().

	 *

	 * @return the login name of the authenticated user

	 */

	public static function getUser() {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::forceAuthentication() or ' . __CLASS__ . '::isAuthenticated()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['result']) {

			phpCAS :: error('authentication was checked (by ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ') but the method returned FALSE');

		}

		return $PHPCAS_CLIENT->getUser();

	}

	/**

	 * Answer attributes about the authenticated user.

	 *

	 * @warning should not be called only after phpCAS::forceAuthentication()

	 * or phpCAS::checkAuthentication().

	 *

	 * @return array

	 */

	public static function getAttributes() {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::forceAuthentication() or ' . __CLASS__ . '::isAuthenticated()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['result']) {

			phpCAS :: error('authentication was checked (by ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ') but the method returned FALSE');

		}

		return $PHPCAS_CLIENT->getAttributes();

	}

	/**

	 * Answer true if there are attributes for the authenticated user.

	 *

	 * @warning should not be called only after phpCAS::forceAuthentication()

	 * or phpCAS::checkAuthentication().

	 *

	 * @return boolean

	 */

	public static function hasAttributes() {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::forceAuthentication() or ' . __CLASS__ . '::isAuthenticated()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['result']) {

			phpCAS :: error('authentication was checked (by ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ') but the method returned FALSE');

		}

		return $PHPCAS_CLIENT->hasAttributes();

	}

	/**

	 * Answer true if an attribute exists for the authenticated user.

	 *

	 * @warning should not be called only after phpCAS::forceAuthentication()

	 * or phpCAS::checkAuthentication().

	 *

	 * @param string $key

	 * @return boolean

	 */

	public static function hasAttribute($key) {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::forceAuthentication() or ' . __CLASS__ . '::isAuthenticated()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['result']) {

			phpCAS :: error('authentication was checked (by ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ') but the method returned FALSE');

		}

		return $PHPCAS_CLIENT->hasAttribute($key);

	}

	/**

	 * Answer an attribute for the authenticated user.

	 *

	 * @warning should not be called only after phpCAS::forceAuthentication()

	 * or phpCAS::checkAuthentication().

	 *

	 * @param string $key

	 * @return mixed string for a single value or an array if multiple values exist.

	 */

	public static function getAttribute($key) {

		global $PHPCAS_CLIENT, $PHPCAS_AUTH_CHECK_CALL;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['done']) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::forceAuthentication() or ' . __CLASS__ . '::isAuthenticated()');

		}

		if (!$PHPCAS_AUTH_CHECK_CALL['result']) {

			phpCAS :: error('authentication was checked (by ' . $PHPCAS_AUTH_CHECK_CALL['method'] . '() at ' . $PHPCAS_AUTH_CHECK_CALL['file'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ') but the method returned FALSE');

		}

		return $PHPCAS_CLIENT->getAttribute($key);

	}

	/**

	 * Handle logout requests.

	 */

	public static function handleLogoutRequests($check_client = true, $allowed_clients = false) {

		global $PHPCAS_CLIENT;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		return ($PHPCAS_CLIENT->handleLogoutRequests($check_client, $allowed_clients));

	}

	/**

	 * This method returns the URL to be used to login.

	 * or phpCAS::isAuthenticated().

	 *

	 * @return the login name of the authenticated user

	 */

	public static function getServerLoginURL() {

		global $PHPCAS_CLIENT;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		return $PHPCAS_CLIENT->getServerLoginURL();

	}

	/**

	 * Set the login URL of the CAS server.

	 * @param $url the login URL

	 * @since 0.4.21 by Wyman Chan

	 */

	public static function setServerLoginURL($url = '') {

		global $PHPCAS_CLIENT;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after

										' . __CLASS__ . '::client()');

		}

		if (gettype($url) != 'string') {

			phpCAS :: error('type mismatched for parameter $url (should be

									`string\')');

		}

		$PHPCAS_CLIENT->setServerLoginURL($url);

		phpCAS :: traceEnd();

	}

	/**

	 * Set the serviceValidate URL of the CAS server.

	 * Used only in CAS 1.0 validations

	 * @param $url the serviceValidate URL

	 * @since 1.1.0 by Joachim Fritschi

	 */

	public static function setServerServiceValidateURL($url = '') {

		global $PHPCAS_CLIENT;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after

										' . __CLASS__ . '::client()');

		}

		if (gettype($url) != 'string') {

			phpCAS :: error('type mismatched for parameter $url (should be

									`string\')');

		}

		$PHPCAS_CLIENT->setServerServiceValidateURL($url);

		phpCAS :: traceEnd();

	}

	/**

	 * Set the proxyValidate URL of the CAS server.

	 * Used for all CAS 2.0 validations

	 * @param $url the proxyValidate URL

	 * @since 1.1.0 by Joachim Fritschi

	 */

	public static function setServerProxyValidateURL($url = '') {

		global $PHPCAS_CLIENT;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after

										' . __CLASS__ . '::client()');

		}

		if (gettype($url) != 'string') {

			phpCAS :: error('type mismatched for parameter $url (should be

									`string\')');

		}

		$PHPCAS_CLIENT->setServerProxyValidateURL($url);

		phpCAS :: traceEnd();

	}

	/**

	 * Set the samlValidate URL of the CAS server.

	 * @param $url the samlValidate URL

	 * @since 1.1.0 by Joachim Fritschi

	 */

	public static function setServerSamlValidateURL($url = '') {

		global $PHPCAS_CLIENT;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after

										' . __CLASS__ . '::client()');

		}

		if (gettype($url) != 'string') {

			phpCAS :: error('type mismatched for parameter $url (should be

									`string\')');

		}

		$PHPCAS_CLIENT->setServerSamlValidateURL($url);

		phpCAS :: traceEnd();

	}

	/**

	 * This method returns the URL to be used to login.

	 * or phpCAS::isAuthenticated().

	 *

	 * @return the login name of the authenticated user

	 */

	public static function getServerLogoutURL() {

		global $PHPCAS_CLIENT;

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should not be called before ' . __CLASS__ . '::client() or ' . __CLASS__ . '::proxy()');

		}

		return $PHPCAS_CLIENT->getServerLogoutURL();

	}

	/**

	 * Set the logout URL of the CAS server.

	 * @param $url the logout URL

	 * @since 0.4.21 by Wyman Chan

	 */

	public static function setServerLogoutURL($url = '') {

		global $PHPCAS_CLIENT;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after

										' . __CLASS__ . '::client()');

		}

		if (gettype($url) != 'string') {

			phpCAS :: error('type mismatched for parameter $url (should be

									`string\')');

		}

		$PHPCAS_CLIENT->setServerLogoutURL($url);

		phpCAS :: traceEnd();

	}

	/**

	 * This method is used to logout from CAS.

	 * @params $params an array that contains the optional url and service parameters that will be passed to the CAS server

	 * @public

	 */

	public static function logout($params = "") {

		global $PHPCAS_CLIENT;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::client() or' . __CLASS__ . '::proxy()');

		}

		$parsedParams = array ();

		if ($params != "") {

			if (is_string($params)) {

				phpCAS :: error('method `phpCAS::logout($url)\' is now deprecated, use `phpCAS::logoutWithUrl($url)\' instead');

			}

			if (!is_array($params)) {

				phpCAS :: error('type mismatched for parameter $params (should be `array\')');

			}

			foreach ($params as $key => $value) {

				if ($key != "service" && $key != "url") {

					phpCAS :: error('only `url\' and `service\' parameters are allowed for method `phpCAS::logout($params)\'');

				}

				$parsedParams[$key] = $value;

			}

		}

		$PHPCAS_CLIENT->logout($parsedParams);

		// never reached

		phpCAS :: traceEnd();

	}

	/**

	 * This method is used to logout from CAS. Halts by redirecting to the CAS server.

	 * @param $service a URL that will be transmitted to the CAS server

	 */

	public static function logoutWithRedirectService($service) {

		global $PHPCAS_CLIENT;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::client() or' . __CLASS__ . '::proxy()');

		}

		if (!is_string($service)) {

			phpCAS :: error('type mismatched for parameter $service (should be `string\')');

		}

		$PHPCAS_CLIENT->logout(array (

			"service" => $service

		));

		// never reached

		phpCAS :: traceEnd();

	}

	/**

	 * This method is used to logout from CAS. Halts by redirecting to the CAS server.

	 * @param $url a URL that will be transmitted to the CAS server

	 * @deprecated The url parameter has been removed from the CAS server as of version 3.3.5.1

	 */

	public static function logoutWithUrl($url) {

		trigger_error('Function deprecated for cas servers >= 3.3.5.1', E_USER_DEPRECATED);

		global $PHPCAS_CLIENT;

		phpCAS :: traceBegin();

		if (!is_object($PHPCAS_CLIENT)) {

			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::client() or' . __CLASS__ . '::proxy()');

		}

		if (!is_string($url)) {

			phpCAS :: error('type mismatched for parameter $url (should be `string\')');