chamilo-lms2/main/auth/cas/lib/CAS.php

<?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 $_SERVER['REQUEST_URI'] in IIS
//
if (!$_SERVER['REQUEST_URI']) {
	$_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['QUERY_STRING'];
}

//
// another one by Vangelis Haniotakis also to make phpCAS work with PHP5
//
if (version_compare(PHP_VERSION, '5', '>=')) {
	require_once (dirname(__FILE__) . '/CAS/domxml-php4-to-php5.php');
}

/**
 * @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', '1.1.1');

// ------------------------------------------------------------------------
//  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');
/**
 * phpCAS::setPGTStorageFile()'s 2nd parameter to write plain text files
 */
define("CAS_PGT_STORAGE_FILE_FORMAT_PLAIN", 'plain');
/**
 * phpCAS::setPGTStorageFile()'s 2nd parameter to write xml files
 */
define("CAS_PGT_STORAGE_FILE_FORMAT_XML", 'xml');
/**
 * Default format used when storing PGT's to file
 */
define("CAS_PGT_STORAGE_FILE_DEFAULT_FORMAT", CAS_PGT_STORAGE_FILE_FORMAT_PLAIN);
// ------------------------------------------------------------------------
//  DATABASE PGT STORAGE
// ------------------------------------------------------------------------
/**
 * default database type when storing PGT's to database
 */
define("CAS_PGT_STORAGE_DB_DEFAULT_DATABASE_TYPE", 'mysql');
/**
 * default host when storing PGT's to database
 */
define("CAS_PGT_STORAGE_DB_DEFAULT_HOSTNAME", 'localhost');
/**
 * default port when storing PGT's to database
 */
define("CAS_PGT_STORAGE_DB_DEFAULT_PORT", '');
/**
 * default database when storing PGT's to database
 */
define("CAS_PGT_STORAGE_DB_DEFAULT_DATABASE", 'phpCAS');
/**
 * default table when storing PGT's to database
 */
define("CAS_PGT_STORAGE_DB_DEFAULT_TABLE", 'pgt');

/** @} */
// ------------------------------------------------------------------------
// 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);

/** @} */
// ------------------------------------------------------------------------
//  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' => '/tmp/cas.log',
	'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 $start_session Have phpCAS start PHP sessions (default true)
	 *
	 * @return a newly created CASClient object
	 */
	function client($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 = phpCAS :: backtrace();
		$PHPCAS_INIT_CALL = array (
			'done' => TRUE,
			'file' => $dbg[0]['file'],
			'line' => $dbg[0]['line'],
			'method' => __CLASS__ . '::' . __FUNCTION__
		);

		// initialize the global object $PHPCAS_CLIENT
		$PHPCAS_CLIENT = new CASClient($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 $start_session Have phpCAS start PHP sessions (default true)
	 *
	 * @return a newly created CASClient object
	 */
	function proxy($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 = phpCAS :: backtrace();
		$PHPCAS_INIT_CALL = array (
			'done' => TRUE,
			'file' => $dbg[0]['file'],
			'line' => $dbg[0]['line'],
			'method' => __CLASS__ . '::' . __FUNCTION__
		);

		// initialize the global object $PHPCAS_CLIENT
		$PHPCAS_CLIENT = new CASClient($server_version, TRUE /*proxy*/
		, $server_hostname, $server_port, $server_uri, $start_session);
		phpCAS :: traceEnd();
	}

	/** @} */
	// ########################################################################
	//  DEBUGGING
	// ########################################################################

	/**
	 * @addtogroup publicDebug
	 * @{
	 */

	/**
	 * Set/unset debug mode
	 *
	 * @param $filename the name of the file used for logging, or FALSE to stop debugging.
	 */
	function setDebug($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 (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 ******************');
	}

	/** @} */
	/**
	 * @addtogroup internalDebug
	 * @{
	 */

	/**
	 * This method is a wrapper for debug_backtrace() that is not available 
	 * in all PHP versions (>= 4.3.0 only)
	 */
	function backtrace() {
		if (function_exists('debug_backtrace')) {
			return debug_backtrace();
		} else {
			// poor man's hack ... but it does work ...
			return array ();
		}
	}

	/**
	 * Logs a string in debug mode.
	 *
	 * @param $str the string to write
	 *
	 * @private
	 */
	function log($str) {
		$indent_str = ".";
		global $PHPCAS_DEBUG;

		if ($PHPCAS_DEBUG['filename']) {
			for ($i = 0; $i < $PHPCAS_DEBUG['indent']; $i++) {
				$indent_str .= '|    ';
			}
			error_log($PHPCAS_DEBUG['unique_id'] . ' ' . $indent_str . $str . "\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 $msg the message to print
	 *
	 * @private
	 */
	function error($msg) {
		$dbg = phpCAS :: backtrace();
		$function = '?';
		$file = '?';
		$line = '?';
		if (is_array($dbg)) {
			for ($i = 1; $i < sizeof($dbg); $i++) {
				if (is_array($dbg[$i])) {
					if ($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.
	 */
	function trace($str) {
		$dbg = phpCAS :: backtrace();
		phpCAS :: log($str . ' [' . basename($dbg[1]['file']) . ':' . $dbg[1]['line'] . ']');
	}

	/**
	 * This method is used to indicate the start of the execution of a function in debug mode.
	 */
	function traceBegin() {
		global $PHPCAS_DEBUG;

		$dbg = phpCAS :: backtrace();
		$str = '=> ';
		if (!empty ($dbg[2]['class'])) {
			$str .= $dbg[2]['class'] . '::';
		}
		$str .= $dbg[2]['function'] . '(';
		if (is_array($dbg[2]['args'])) {
			foreach ($dbg[2]['args'] as $index => $arg) {
				if ($index != 0) {
					$str .= ', ';
				}
				$str .= str_replace("\n", "", var_export($arg, TRUE));
			}
		}
		$str .= ') [' . basename($dbg[2]['file']) . ':' . $dbg[2]['line'] . ']';
		phpCAS :: log($str);
		$PHPCAS_DEBUG['indent']++;
	}

	/**
	 * This method is used to indicate the end of the execution of a function in debug mode.
	 *
	 * @param $res the result of the function
	 */
	function traceEnd($res = '') {
		global $PHPCAS_DEBUG;

		$PHPCAS_DEBUG['indent']--;
		$dbg = phpCAS :: backtrace();
		$str = '';
		$str .= '<= ' . str_replace("\n", "", var_export($res, TRUE));
		phpCAS :: log($str);
	}

	/**
	 * This method is used to indicate the end of the execution of the program
	 */
	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 $lang a string representing the language.
	 *
	 * @sa PHPCAS_LANG_FRENCH, PHPCAS_LANG_ENGLISH
	 */
	function setLang($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.
	 */
	function getVersion() {
		return PHPCAS_VERSION;
	}

	/** @} */
	// ########################################################################
	//  HTML OUTPUT
	// ########################################################################
	/**
	 * @addtogroup publicOutput
	 * @{
	 */

	/**
	 * This method sets the HTML header used for all outputs.
	 *
	 * @param $header the HTML header.
	 */
	function setHTMLHeader($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 $footer the HTML footer.
	 */
	function setHTMLFooter($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 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 (`plain' and `xml' allowed)
	 * @param $path the path where the PGT's should be stored
	 */
	function setPGTStorageFile($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\')');
		}
		$PHPCAS_CLIENT->setPGTStorageFile($format, $path);
		phpCAS :: traceEnd();
	}

	/**
	 * This method is used to tell phpCAS to store the response of the
	 * CAS server to PGT requests into a database. 
	 * @note The connection to the database is done only when needed. 
	 * As a consequence, bad parameters are detected only when 
	 * initializing PGT storage, except in debug mode.
	 *
	 * @param $user the user to access the data with
	 * @param $password the user's password
	 * @param $database_type the type of the database hosting the data
	 * @param $hostname the server hosting the database
	 * @param $port the port the server is listening on
	 * @param $database the name of the database
	 * @param $table the name of the table storing the data
	 */
	function setPGTStorageDB($user, $password, $database_type = '', $hostname = '', $port = 0, $database = '', $table = '') {
		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'] . ':' . $PHPCAS_AUTH_CHECK_CALL['line'] . ')');
		}
		if (gettype($user) != 'string') {
			phpCAS :: error('type mismatched for parameter $user (should be `string\')');
		}
		if (gettype($password) != 'string') {
			phpCAS :: error('type mismatched for parameter $password (should be `string\')');
		}
		if (gettype($database_type) != 'string') {
			phpCAS :: error('type mismatched for parameter $database_type (should be `string\')');
		}
		if (gettype($hostname) != 'string') {
			phpCAS :: error('type mismatched for parameter $hostname (should be `string\')');
		}
		if (gettype($port) != 'integer') {
			phpCAS :: error('type mismatched for parameter $port (should be `integer\')');
		}
		if (gettype($database) != 'string') {
			phpCAS :: error('type mismatched for parameter $database (should be `string\')');
		}
		if (gettype($table) != 'string') {
			phpCAS :: error('type mismatched for parameter $table (should be `string\')');
		}
		$PHPCAS_CLIENT->setPGTStorageDB($user, $password, $database_type, $hostname, $port, $database, $table);
		phpCAS :: traceEnd();
	}

	/** @} */
	// ########################################################################
	// ACCESS TO EXTERNAL SERVICES
	// ########################################################################
	/**
	 * @addtogroup publicServices
	 * @{
	 */

	/**
	 * 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 $output contains an error message).
	 */
	function serviceWeb($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 $err_msg contains an error message).
	 */
	function serviceMail($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 $n an integer.
	 */
	function setCacheTimesForAuthRecheck($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);
	}

	/**
	 * This method is called to check if the user is authenticated (use the gateway feature).
	 * @return TRUE when the user is authenticated; otherwise FALSE.
	 */
	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 = phpCAS :: 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.
	 */
	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 = phpCAS :: 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.
	 **/
	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()');
		}

		// store where the authentication has been checked and the result
		$dbg = phpCAS :: 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 has been left from version 0.4.1 for compatibility reasons.
	 */
	function authenticate() {
		phpCAS :: error('this method is deprecated. You should use ' . __CLASS__ . '::forceAuthentication() instead');
	}

	/**
	 * 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.
	 */
	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 = phpCAS :: 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
	 */
	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
	 */
	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();
	}

	/**
	 * 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
	 */
	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 $PHPCAS_CLIENT->getAttributes();
	}
	/**
	 * Handle logout requests.
	 */
	function handleLogoutRequests($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
	 */
	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 $url the login URL
	 * @since 0.4.21 by Wyman Chan
	 */
	function setServerLoginURL($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 $url the serviceValidate URL
	 * @since 1.1.0 by Joachim Fritschi
	 */
	function setServerServiceValidateURL($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 $url the proxyValidate URL
	 * @since 1.1.0 by Joachim Fritschi
	 */
	function setServerProxyValidateURL($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 $url the samlValidate URL
	 * @since 1.1.0 by Joachim Fritschi
	 */
	function setServerSamlValidateURL($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
	 */
	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 $url the logout URL
	 * @since 0.4.21 by Wyman Chan
	 */
	function setServerLogoutURL($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 $params an array that contains the optional url and service parameters that will be passed to the CAS server
	 * @public
	 */
	function logout($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 $service a URL that will be transmitted to the CAS server
	 */
	function logoutWithRedirectService($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 $url a URL that will be transmitted to the CAS server
	 */
	function logoutWithUrl($url) {
		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\')');
		}
		$PHPCAS_CLIENT->logout(array (
			"url" => $url
		));
		// 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
	 * @param $url a URL that will be transmitted to the CAS server
	 */
	function logoutWithRedirectServiceAndUrl($service, $url) {
		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 $service (should be `string\')');
		}
		if (!is_string($url)) {
			phpCAS :: error('type mismatched for parameter $url (should be `string\')');
		}
		$PHPCAS_CLIENT->logout(array (
			"service" => $service,
			"url" => $url
		));
		// never reached
		phpCAS :: traceEnd();
	}

	/**
	 * Set the fixed URL that will be used by the CAS server to transmit the PGT.
	 * When this method is not called, a phpCAS script uses its own URL for the callback.
	 *
	 * @param $url the URL
	 */
	function setFixedCallbackURL($url = '') {
		global $PHPCAS_CLIENT;
		phpCAS :: traceBegin();
		if (!is_object($PHPCAS_CLIENT)) {
			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');
		}
		if (!$PHPCAS_CLIENT->isProxy()) {
			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');
		}
		if (gettype($url) != 'string') {
			phpCAS :: error('type mismatched for parameter $url (should be `string\')');
		}
		$PHPCAS_CLIENT->setCallbackURL($url);
		phpCAS :: traceEnd();
	}

	/**
	 * Set the fixed URL that will be set as the CAS service parameter. When this
	 * method is not called, a phpCAS script uses its own URL.
	 *
	 * @param $url the URL
	 */
	function setFixedServiceURL($url) {
		global $PHPCAS_CLIENT;
		phpCAS :: traceBegin();
		if (!is_object($PHPCAS_CLIENT)) {
			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');
		}
		if (gettype($url) != 'string') {
			phpCAS :: error('type mismatched for parameter $url (should be `string\')');
		}
		$PHPCAS_CLIENT->setURL($url);
		phpCAS :: traceEnd();
	}

	/**
	 * Get the URL that is set as the CAS service parameter.
	 */
	function getServiceURL() {
		global $PHPCAS_CLIENT;
		if (!is_object($PHPCAS_CLIENT)) {
			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');
		}
		return ($PHPCAS_CLIENT->getURL());
	}

	/**
	 * Retrieve a Proxy Ticket from the CAS server.
	 */
	function retrievePT($target_service, & $err_code, & $err_msg) {
		global $PHPCAS_CLIENT;
		if (!is_object($PHPCAS_CLIENT)) {
			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::proxy()');
		}
		if (gettype($target_service) != 'string') {
			phpCAS :: error('type mismatched for parameter $target_service(should be `string\')');
		}
		return ($PHPCAS_CLIENT->retrievePT($target_service, $err_code, $err_msg));
	}

	/**
	 * Set the certificate of the CAS server.
	 *
	 * @param $cert the PEM certificate
	 */
	function setCasServerCert($cert) {
		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 (gettype($cert) != 'string') {
			phpCAS :: error('type mismatched for parameter $cert (should be `string\')');
		}
		$PHPCAS_CLIENT->setCasServerCert($cert);
		phpCAS :: traceEnd();
	}

	/**
	 * Set the certificate of the CAS server CA.
	 *
	 * @param $cert the CA certificate
	 */
	function setCasServerCACert($cert) {
		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 (gettype($cert) != 'string') {
			phpCAS :: error('type mismatched for parameter $cert (should be `string\')');
		}
		$PHPCAS_CLIENT->setCasServerCACert($cert);
		phpCAS :: traceEnd();
	}

	/**
	 * Set no SSL validation for the CAS server.
	 */
	function setNoCasServerValidation() {
		global $PHPCAS_CLIENT;
		phpCAS :: traceBegin();
		if (!is_object($PHPCAS_CLIENT)) {
			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::client() or' . __CLASS__ . '::proxy()');
		}
		$PHPCAS_CLIENT->setNoCasServerValidation();
		phpCAS :: traceEnd();
	}

	/** @} */

	/**
	 * Change CURL options.
	 * CURL is used to connect through HTTPS to CAS server
	 * @param $key the option key
	 * @param $value the value to set
	 */
	function setExtraCurlOption($key, $value) {
		global $PHPCAS_CLIENT;
		phpCAS :: traceBegin();
		if (!is_object($PHPCAS_CLIENT)) {
			phpCAS :: error('this method should only be called after ' . __CLASS__ . '::client() or' . __CLASS__ . '::proxy()');
		}
		$PHPCAS_CLIENT->setExtraCurlOption($key, $value);
		phpCAS :: traceEnd();
	}

}

// ########################################################################
// DOCUMENTATION
// ########################################################################

// ########################################################################
//  MAIN PAGE

/**
 * @mainpage
 *
 * The following pages only show the source documentation.
 *
 */

// ########################################################################
//  MODULES DEFINITION

/** @defgroup public User interface */

/** @defgroup publicInit Initialization
 *  @ingroup public */

/** @defgroup publicAuth Authentication
 *  @ingroup public */

/** @defgroup publicServices Access to external services
 *  @ingroup public */

/** @defgroup publicConfig Configuration
 *  @ingroup public */

/** @defgroup publicLang Internationalization
 *  @ingroup publicConfig */

/** @defgroup publicOutput HTML output
 *  @ingroup publicConfig */

/** @defgroup publicPGTStorage PGT storage
 *  @ingroup publicConfig */

/** @defgroup publicDebug Debugging
 *  @ingroup public */

/** @defgroup internal Implementation */

/** @defgroup internalAuthentication Authentication
 *  @ingroup internal */

/** @defgroup internalBasic CAS Basic client features (CAS 1.0, Service Tickets)
 *  @ingroup internal */

/** @defgroup internalProxy CAS Proxy features (CAS 2.0, Proxy Granting Tickets)
 *  @ingroup internal */

/** @defgroup internalPGTStorage PGT storage
 *  @ingroup internalProxy */

/** @defgroup internalPGTStorageDB PGT storage in a database
 *  @ingroup internalPGTStorage */

/** @defgroup internalPGTStorageFile PGT storage on the filesystem
 *  @ingroup internalPGTStorage */

/** @defgroup internalCallback Callback from the CAS server
 *  @ingroup internalProxy */

/** @defgroup internalProxied CAS proxied client features (CAS 2.0, Proxy Tickets)
 *  @ingroup internal */

/** @defgroup internalConfig Configuration
 *  @ingroup internal */

/** @defgroup internalOutput HTML output
 *  @ingroup internalConfig */

/** @defgroup internalLang Internationalization
 *  @ingroup internalConfig
 *
 * To add a new language:
 * - 1. define a new constant PHPCAS_LANG_XXXXXX in CAS/CAS.php
 * - 2. copy any file from CAS/languages to CAS/languages/XXXXXX.php
 * - 3. Make the translations
 */

/** @defgroup internalDebug Debugging
 *  @ingroup internal */

/** @defgroup internalMisc Miscellaneous
 *  @ingroup internal */

// ########################################################################
//  EXAMPLES

/**
 * @example example_simple.php
 */
/**
 * @example example_proxy.php
 */
/**
 * @example example_proxy2.php
 */
/**
 * @example example_lang.php
 */
/**
 * @example example_html.php
 */
/**
 * @example example_file.php
 */
/**
 * @example example_db.php
 */
/**
 * @example example_service.php
 */
/**
 * @example example_session_proxy.php
 */
/**
 * @example example_session_service.php
 */
/**
 * @example example_gateway.php
 */
/**
 * @example example_custom_urls.php
 */
?>