class.ilInitialisation.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */

// needed for slow queries, etc.
if(!isset($GLOBALS['ilGlobalStartTime']) || !$GLOBALS['ilGlobalStartTime'])
{
        $GLOBALS['ilGlobalStartTime'] = microtime();
}

include_once "Services/Context/classes/class.ilContext.php";

class ilInitialisation
{
        protected static function removeUnsafeCharacters()
        {
                // Remove unsafe characters from GET parameters.
                // We do not need this characters in any case, so it is
                // feasible to filter them everytime. POST parameters
                // need attention through ilUtil::stripSlashes() and similar functions)
                if (is_array($_GET))
                {
                        foreach($_GET as $k => $v)
                        {
                                // \r\n used for IMAP MX Injection
                                // ' used for SQL Injection
                                $_GET[$k] = str_replace(array("\x00", "\n", "\r", "\\", "'", '"', "\x1a"), "", $v);

                                // this one is for XSS of any kind
                                $_GET[$k] = strip_tags($_GET[$k]);
                        }
                }
        }
        
        protected static function requireCommonIncludes()
        {                       
                // pear
                require_once("include/inc.get_pear.php");
                require_once("include/inc.check_pear.php");
                require_once "PEAR.php";
                
                // ilTemplate
                if(ilContext::usesTemplate())
                {
                        // HTML_Template_IT support
                        @include_once "HTML/Template/ITX.php";          // new implementation
                        if (class_exists("HTML_Template_ITX"))
                        {
                                include_once "./Services/UICore/classes/class.ilTemplateHTMLITX.php";
                        }
                        else
                        {
                                include_once "HTML/ITX.php";            // old implementation
                                include_once "./Services/UICore/classes/class.ilTemplateITX.php";
                        }
                        require_once "./Services/UICore/classes/class.ilTemplate.php";
                }               
                                
                // really always required?
                require_once "./Services/Utilities/classes/class.ilUtil.php";   
                require_once "./Services/Utilities/classes/class.ilFormat.php";
                require_once "./Services/Calendar/classes/class.ilDatePresentation.php";                                                                                                                
                require_once "include/inc.ilias_version.php";   
                
                self::initGlobal("ilBench", "ilBenchmark", "./Services/Utilities/classes/class.ilBenchmark.php");                               
        }
        
        protected static function includePhp5Compliance()
        {
                // php5 downward complaince to php 4 dom xml and clone method
                if (version_compare(PHP_VERSION,'5','>='))
                {
                        include_once 'Services/Authentication/classes/class.ilAuthFactory.php';
                        if(ilAuthFactory::getContext() != ilAuthFactory::CONTEXT_CAS)
                        {
                                require_once("include/inc.xml5compliance.php");
                        }
                        require_once("include/inc.xsl5compliance.php");
                }
        }

        protected static function initIliasIniFile()
        {               
                require_once("./Services/Init/classes/class.ilIniFile.php");
                $ilIliasIniFile = new ilIniFile("./ilias.ini.php");                             
                $ilIliasIniFile->read();
                self::initGlobal('ilIliasIniFile', $ilIliasIniFile);

                // initialize constants
                define("ILIAS_DATA_DIR",$ilIliasIniFile->readVariable("clients","datadir"));
                define("ILIAS_WEB_DIR",$ilIliasIniFile->readVariable("clients","path"));
                define("ILIAS_ABSOLUTE_PATH",$ilIliasIniFile->readVariable('server','absolute_path'));

                // logging
                define ("ILIAS_LOG_DIR",$ilIliasIniFile->readVariable("log","path"));
                define ("ILIAS_LOG_FILE",$ilIliasIniFile->readVariable("log","file"));
                define ("ILIAS_LOG_ENABLED",$ilIliasIniFile->readVariable("log","enabled"));
                define ("ILIAS_LOG_LEVEL",$ilIliasIniFile->readVariable("log","level"));
                define ("SLOW_REQUEST_TIME",$ilIliasIniFile->readVariable("log","slow_request_time"));

                // read path + command for third party tools from ilias.ini
                define ("PATH_TO_CONVERT",$ilIliasIniFile->readVariable("tools","convert"));
                define ("PATH_TO_FFMPEG",$ilIliasIniFile->readVariable("tools","ffmpeg"));
                define ("PATH_TO_ZIP",$ilIliasIniFile->readVariable("tools","zip"));
                define ("PATH_TO_MKISOFS",$ilIliasIniFile->readVariable("tools","mkisofs"));
                define ("PATH_TO_UNZIP",$ilIliasIniFile->readVariable("tools","unzip"));
                define ("PATH_TO_GHOSTSCRIPT",$ilIliasIniFile->readVariable("tools","ghostscript"));
                define ("PATH_TO_JAVA",$ilIliasIniFile->readVariable("tools","java"));
                define ("PATH_TO_HTMLDOC",$ilIliasIniFile->readVariable("tools","htmldoc"));
                define ("URL_TO_LATEX",$ilIliasIniFile->readVariable("tools","latex"));
                define ("PATH_TO_FOP",$ilIliasIniFile->readVariable("tools","fop"));

                // read virus scanner settings
                switch ($ilIliasIniFile->readVariable("tools", "vscantype"))
                {
                        case "sophos":
                                define("IL_VIRUS_SCANNER", "Sophos");
                                define("IL_VIRUS_SCAN_COMMAND", $ilIliasIniFile->readVariable("tools", "scancommand"));
                                define("IL_VIRUS_CLEAN_COMMAND", $ilIliasIniFile->readVariable("tools", "cleancommand"));
                                break;

                        case "antivir":
                                define("IL_VIRUS_SCANNER", "AntiVir");
                                define("IL_VIRUS_SCAN_COMMAND", $ilIliasIniFile->readVariable("tools", "scancommand"));
                                define("IL_VIRUS_CLEAN_COMMAND", $ilIliasIniFile->readVariable("tools", "cleancommand"));
                                break;

                        case "clamav":
                                define("IL_VIRUS_SCANNER", "ClamAV");
                                define("IL_VIRUS_SCAN_COMMAND", $ilIliasIniFile->readVariable("tools", "scancommand"));
                                define("IL_VIRUS_CLEAN_COMMAND", $ilIliasIniFile->readVariable("tools", "cleancommand"));
                                break;

                        default:
                                define("IL_VIRUS_SCANNER", "None");
                                break;
                }
                
                $tz = $ilIliasIniFile->readVariable("server","timezone");
                if ($tz != "")
                {
                        if (function_exists('date_default_timezone_set'))
                        {
                                date_default_timezone_set($tz);
                        }
                }
                define ("IL_TIMEZONE", $ilIliasIniFile->readVariable("server","timezone"));
        }

        protected static function buildHTTPPath()
        {
                include_once './Services/Http/classes/class.ilHTTPS.php';
                $https = new ilHTTPS();

            if($https->isDetected())
                {
                        $protocol = 'https://';
                }
                else
                {
                        $protocol = 'http://';
                }
                $host = $_SERVER['HTTP_HOST'];

                $rq_uri = strip_tags($_SERVER['REQUEST_URI']);

                // security fix: this failed, if the URI contained "?" and following "/"
                // -> we remove everything after "?"
                if (is_int($pos = strpos($rq_uri, "?")))
                {
                        $rq_uri = substr($rq_uri, 0, $pos);
                }

                if(!defined('ILIAS_MODULE'))
                {
                        $path = pathinfo($rq_uri);
                        if(!$path['extension'])
                        {
                                $uri = $rq_uri;
                        }
                        else
                        {
                                $uri = dirname($rq_uri);
                        }
                }
                else
                {
                        // if in module remove module name from HTTP_PATH
                        $path = dirname($rq_uri);

                        // dirname cuts the last directory from a directory path e.g content/classes return content

                        $module = ilUtil::removeTrailingPathSeparators(ILIAS_MODULE);

                        $dirs = explode('/',$module);
                        $uri = $path;
                        foreach($dirs as $dir)
                        {
                                $uri = dirname($uri);
                        }
                }
                
                return define('ILIAS_HTTP_PATH',ilUtil::removeTrailingPathSeparators($protocol.$host.$uri));
        }

        protected static function determineClient()
        {
                global $ilIliasIniFile;

                // check whether ini file object exists
                if (!is_object($ilIliasIniFile))
                {
                        self::abortAndDie("Fatal Error: ilInitialisation::determineClient called without initialisation of ILIAS ini file object.");
                }
                                
                // set to default client if empty
                if ($_GET["client_id"] != "")
                {
                        $_GET["client_id"] = ilUtil::stripSlashes($_GET["client_id"]);
                        if (!defined("IL_PHPUNIT_TEST"))
                        {
                                ilUtil::setCookie("ilClientId", $_GET["client_id"]);
                        }
                }
                else if (!$_COOKIE["ilClientId"])
                {
                        // to do: ilias ini raus nehmen
                        $client_id = $ilIliasIniFile->readVariable("clients","default");
                        ilUtil::setCookie("ilClientId", $client_id);
                }
                if (!defined("IL_PHPUNIT_TEST"))
                {
                        define ("CLIENT_ID", $_COOKIE["ilClientId"]);
                }
                else
                {
                        define ("CLIENT_ID", $_GET["client_id"]);
                }
        }

        protected static function initClientIniFile()
        {
                global $ilIliasIniFile;
                
                // check whether ILIAS_WEB_DIR is set.
                if (ILIAS_WEB_DIR == "")
                {
                        self::abortAndDie("Fatal Error: ilInitialisation::initClientIniFile called without ILIAS_WEB_DIR.");
                }

                // check whether CLIENT_ID is set.
                if (CLIENT_ID == "")
                {
                        self::abortAndDie("Fatal Error: ilInitialisation::initClientIniFile called without CLIENT_ID.");
                }

                $ini_file = "./".ILIAS_WEB_DIR."/".CLIENT_ID."/client.ini.php";

                // get settings from ini file
                require_once("./Services/Init/classes/class.ilIniFile.php");
                $ilClientIniFile = new ilIniFile($ini_file);            
                $ilClientIniFile->read();
                
                // invalid client id / client ini
                if ($ilClientIniFile->ERROR != "")
                {
                        $c = $_COOKIE["ilClientId"];
                        $default_client = $ilIliasIniFile->readVariable("clients","default");                                           
                        ilUtil::setCookie("ilClientId", $default_client);
                        if (CLIENT_ID != "" && CLIENT_ID != $default_client)
                        {
                                $mess = array("en" => "Client does not exist.",
                                                "de" => "Mandant ist ungültig.");
                                self::redirect("index.php?client_id=".$default_client, null, $mess);                                                    
                        }
                        else
                        {
                                self::abortAndDie("Fatal Error: ilInitialisation::initClientIniFile initializing client ini file abborted with: ". $ilClientIniFile->ERROR);
                        }
                }
                
                self::initGlobal("ilClientIniFile", $ilClientIniFile);

                // set constants
                define ("SESSION_REMINDER_LEADTIME", 30);
                define ("DEBUG",$ilClientIniFile->readVariable("system","DEBUG"));
                define ("DEVMODE",$ilClientIniFile->readVariable("system","DEVMODE"));
                define ("SHOWNOTICES",$ilClientIniFile->readVariable("system","SHOWNOTICES"));
                define ("ROOT_FOLDER_ID",$ilClientIniFile->readVariable('system','ROOT_FOLDER_ID'));
                define ("SYSTEM_FOLDER_ID",$ilClientIniFile->readVariable('system','SYSTEM_FOLDER_ID'));
                define ("ROLE_FOLDER_ID",$ilClientIniFile->readVariable('system','ROLE_FOLDER_ID'));
                define ("MAIL_SETTINGS_ID",$ilClientIniFile->readVariable('system','MAIL_SETTINGS_ID'));
                
                // this is for the online help installation, which sets OH_REF_ID to the
                // ref id of the online module
                define ("OH_REF_ID",$ilClientIniFile->readVariable("system","OH_REF_ID"));

                define ("SYSTEM_MAIL_ADDRESS",$ilClientIniFile->readVariable('system','MAIL_SENT_ADDRESS')); // Change SS
                define ("MAIL_REPLY_WARNING",$ilClientIniFile->readVariable('system','MAIL_REPLY_WARNING')); // Change SS

                // see ilObject::TITLE_LENGTH, ilObject::DESC_LENGTH
                // define ("MAXLENGTH_OBJ_TITLE",125);#$ilClientIniFile->readVariable('system','MAXLENGTH_OBJ_TITLE'));
                // define ("MAXLENGTH_OBJ_DESC",$ilClientIniFile->readVariable('system','MAXLENGTH_OBJ_DESC'));

                define ("CLIENT_DATA_DIR",ILIAS_DATA_DIR."/".CLIENT_ID);
                define ("CLIENT_WEB_DIR",ILIAS_ABSOLUTE_PATH."/".ILIAS_WEB_DIR."/".CLIENT_ID);
                define ("CLIENT_NAME",$ilClientIniFile->readVariable('client','name')); // Change SS

                $val = $ilClientIniFile->readVariable("db","type");
                if ($val == "")
                {
                        define ("IL_DB_TYPE", "mysql");
                }
                else
                {
                        define ("IL_DB_TYPE", $val);
                }
                
                return true;
        }

        protected static function handleMaintenanceMode()
        {
                global $ilClientIniFile;

                if (!$ilClientIniFile->readVariable("client","access"))
                {                                               
                        $mess = array("en" => "The server is not available due to maintenance.".
                                        " We apologise for any inconvenience.",
                                "de" => "Der Server ist aufgrund von Wartungsarbeiten nicht verfügbar.".
                                        " Wir bitten um Verständnis.");
                        $mess_id = "init_error_maintenance";
                        
                        if (ilContext::hasHTML() && is_file("./maintenance.html"))
                        {
                                self::redirect("./maintenance.html", $mess_id, $mess);
                        }
                        else
                        {                                       
                                $mess = self::translateMessage($mess_id, $mess);
                                self::abortAndDie($mess);
                        }
                }
        }

        protected static function initDatabase()
        {
                // build dsn of database connection and connect
                require_once("./Services/Database/classes/class.ilDBWrapperFactory.php");                               
                $ilDB = ilDBWrapperFactory::getWrapper(IL_DB_TYPE);
                $ilDB->initFromIniFile();
                $ilDB->connect();
                
                self::initGlobal("ilDB", $ilDB);                
        }

        public static function setSessionHandler()
        {
                if(ini_get('session.save_handler') != 'user')
                {
                        ini_set("session.save_handler", "user");
                }
                
                require_once "Services/Authentication/classes/class.ilSessionDBHandler.php";
                $db_session_handler = new ilSessionDBHandler();
                if (!$db_session_handler->setSaveHandler())
                {
                        self::abortAndDie("Please turn off Safe mode OR set session.save_handler to \"user\" in your php.ini");
                }
                                                
                // Do not accept external session ids
                if (!ilSession::_exists(session_id()) && !defined('IL_PHPUNIT_TEST'))
                {
                        session_regenerate_id();
                }                               
        }
        
        protected static function setCookieParams()
        {
                global $ilSetting;
                
                include_once 'Services/Authentication/classes/class.ilAuthFactory.php';
                if(ilAuthFactory::getContext() == ilAuthFactory::CONTEXT_HTTP) 
                {
                        $cookie_path = '/';
                }
                elseif ($GLOBALS['COOKIE_PATH'])
                {
                        // use a predefined cookie path from WebAccessChecker
                $cookie_path = $GLOBALS['COOKIE_PATH'];
            }
                else
                {
                        $cookie_path = dirname( $_SERVER['PHP_SELF'] );
                }
                
                /* if ilias is called directly within the docroot $cookie_path
                is set to '/' expecting on servers running under windows..
                here it is set to '\'.
                in both cases a further '/' won't be appended due to the following regex
                */
                $cookie_path .= (!preg_match("/[\/|\\\\]$/", $cookie_path)) ? "/" : "";
                
                if($cookie_path == "\\") $cookie_path = '/';
                
                include_once './Services/Http/classes/class.ilHTTPS.php';
                $cookie_secure = !$ilSetting->get('https', 0) && ilHTTPS::getInstance()->isDetected();
                
                define('IL_COOKIE_EXPIRE',0);
                define('IL_COOKIE_PATH',$cookie_path);
                define('IL_COOKIE_DOMAIN','');
                define('IL_COOKIE_SECURE', $cookie_secure); // Default Value

                // session_set_cookie_params() supports 5th parameter
                // only for php version 5.2.0 and above
                if( version_compare(PHP_VERSION, '5.2.0', '>=') )
                {
                        // PHP version >= 5.2.0
                        define('IL_COOKIE_HTTPONLY',true); // Default Value
                        session_set_cookie_params(
                                        IL_COOKIE_EXPIRE, IL_COOKIE_PATH, IL_COOKIE_DOMAIN, IL_COOKIE_SECURE, IL_COOKIE_HTTPONLY
                        );
                }
                else
                {
                        // PHP version < 5.2.0
                        session_set_cookie_params(
                                        IL_COOKIE_EXPIRE, IL_COOKIE_PATH, IL_COOKIE_DOMAIN, IL_COOKIE_SECURE
                        );
                }
        }

        protected static function initSettings()
        {
                global $ilSetting;

                self::initGlobal("ilSetting", "ilSetting", 
                        "Services/Administration/classes/class.ilSetting.php");
                                
                // check correct setup
                if (!$ilSetting->get("setup_ok"))
                {
                        self::abortAndDie("Setup is not completed. Please run setup routine again.");
                }

                // set anonymous user & role id and system role id
                define ("ANONYMOUS_USER_ID", $ilSetting->get("anonymous_user_id"));
                define ("ANONYMOUS_ROLE_ID", $ilSetting->get("anonymous_role_id"));
                define ("SYSTEM_USER_ID", $ilSetting->get("system_user_id"));
                define ("SYSTEM_ROLE_ID", $ilSetting->get("system_role_id"));
                define ("USER_FOLDER_ID", 7);

                // recovery folder
                define ("RECOVERY_FOLDER_ID", $ilSetting->get("recovery_folder_id"));

                // installation id
                define ("IL_INST_ID", $ilSetting->get("inst_id",0));

                // define default suffix replacements
                define ("SUFFIX_REPL_DEFAULT", "php,php3,php4,inc,lang,phtml,htaccess");
                define ("SUFFIX_REPL_ADDITIONAL", $ilSetting->get("suffix_repl_additional"));

                if(ilContext::usesHTTP())
                {
                        self::buildHTTPPath();
                }

                // payment setting
                require_once('Services/Payment/classes/class.ilPaymentSettings.php');
                define('IS_PAYMENT_ENABLED', ilPaymentSettings::_isPaymentEnabled());           
        }

        protected static function initStyle()
        {
                global $styleDefinition, $ilPluginAdmin;

                // load style definitions
                self::initGlobal("styleDefinition", "ilStyleDefinition",
                         "./Services/Style/classes/class.ilStyleDefinition.php");

                // add user interface hook for style initialisation
                $pl_names = $ilPluginAdmin->getActivePluginsForSlot(IL_COMP_SERVICE, "UIComponent", "uihk");
                foreach ($pl_names as $pl)
                {
                        $ui_plugin = ilPluginAdmin::getPluginObject(IL_COMP_SERVICE, "UIComponent", "uihk", $pl);
                        $gui_class = $ui_plugin->getUIClassInstance();
                        $gui_class->modifyGUI("Services/Init", "init_style", array("styleDefinition" => $styleDefinition));
                }

                $styleDefinition->startParsing();
        }

        public static function initUserAccount()
        {
                global $ilUser;

                // get user id
                if (!ilSession::get("AccountId"))
                {
                        ilSession::set("AccountId", $ilUser->checkUserId());
                        ilSession::set('orig_request_target', '');
                        $ilUser->hasToAcceptTermsOfServiceInSession(true);
                }
                
                $uid = ilSession::get("AccountId");             
                if($uid)
                {
                        $ilUser->setId($uid);   
                        $ilUser->read();
                }
                else
                {
                        if(is_object($GLOBALS['ilLog']))
                        {
                                $GLOBALS['ilLog']->logStack();
                        }
                        self::abortAndDie("Init user account failed");
                }
        }

        protected static function initLocale()
        {
                global $ilSetting;
                
                if (trim($ilSetting->get("locale") != ""))
                {
                        $larr = explode(",", trim($ilSetting->get("locale")));
                        $ls = array();
                        $first = $larr[0];
                        foreach ($larr as $l)
                        {
                                if (trim($l) != "")
                                {
                                        $ls[] = $l;
                                }
                        }
                        if (count($ls) > 0)
                        {
                                setlocale(LC_ALL, $ls);
                                if (class_exists("Collator"))
                                {
                                        $GLOBALS["ilCollator"] = new Collator($first);
                                }
                        }
                }
        }
        
        public static function goToPublicSection($a_auth_stat = "")
        {
                global $ilAuth;
                                
                if (ANONYMOUS_USER_ID == "")
                {
                        self::abortAndDie("Public Section enabled, but no Anonymous user found.");
                }

                // logout and end previous session
                if($a_auth_stat == AUTH_EXPIRED ||
                        $a_auth_stat == AUTH_IDLED)
                {
                        ilSession::setClosingContext(ilSession::SESSION_CLOSE_EXPIRE);
                }
                else
                {
                        ilSession::setClosingContext(ilSession::SESSION_CLOSE_PUBLIC);
                }
                $ilAuth->logout();
                session_unset();
                session_destroy();
                
                // new session and login as anonymous
                self::setSessionHandler();
                session_start();
                $_POST["username"] = "anonymous";
                $_POST["password"] = "anonymous";
                ilAuthUtils::_initAuth();
                
                // authenticate (anonymous)
                $oldSid = session_id();         
                $ilAuth->start();               
                if (IS_PAYMENT_ENABLED)
                {
                        $newSid = session_id();
                        if($oldSid != $newSid)
                        {
                                include_once './Services/Payment/classes/class.ilPaymentShoppingCart.php';
                                ilPaymentShoppingCart::_migrateShoppingCart($oldSid, $newSid);
                        }
                }
                
                if (!$ilAuth->getAuth())
                {
                        self::abortAndDie("ANONYMOUS user with the object_id ".ANONYMOUS_USER_ID." not found!");
                }
                
                self::initUserAccount();
                
                $mess_id = "init_error_authentication_fail";
                $mess = array("en" => "Authentication failed.",
                        "de" => "Authentifizierung fehlgeschlagen.");
                
                // if target given, try to go there
                if ($_GET["target"] != "")
                {       
                        // when we are already "inside" goto.php no redirect is needed
                        $current_script = substr(strrchr($_SERVER["PHP_SELF"], "/"), 1);        
                        if($current_script == "goto.php")
                        {
                                return;
                        }               
                        
                        // goto will check if target is accessible or redirect to login
                        self::redirect("goto.php?target=".$_GET["target"], $mess_id, $mess);                    
                }
                
                // we do not know if ref_id of request is accesible, so redirecting to root
                $_GET["ref_id"] = ROOT_FOLDER_ID;
                $_GET["cmd"] = "frameset";
                self::redirect("ilias.php?baseClass=ilrepositorygui&reloadpublic=1&cmd=".
                        $_GET["cmd"]."&ref_id=".$_GET["ref_id"], $mess_id, $mess);
        }

        protected static function goToLogin($a_auth_stat = "")
        {               
                global $ilAuth;
                
                // close current session
                if($a_auth_stat == AUTH_EXPIRED ||
                        $a_auth_stat == AUTH_IDLED)
                {
                        ilSession::setClosingContext(ilSession::SESSION_CLOSE_EXPIRE);
                }
                else
                {
                        ilSession::setClosingContext(ilSession::SESSION_CLOSE_LOGIN);
                }
                $ilAuth->logout();
                session_unset();
                session_destroy();

                $add = "";
                if ($_GET["soap_pw"] != "")
                {
                        $add = "&soap_pw=".$_GET["soap_pw"]."&ext_uid=".$_GET["ext_uid"];
                }

                $script = "login.php?target=".$_GET["target"]."&client_id=".$_COOKIE["ilClientId"].
                        "&auth_stat=".$a_auth_stat.$add;
                                        
                self::redirect($script, "init_error_authentication_fail",
                        array("en" => "Authentication failed.",
                                "de" => "Authentifizierung fehlgeschlagen."));
        }

        protected static function initLanguage()
        {
                global $ilUser, $ilSetting, $rbacsystem;
                
                if (!ilSession::get("lang"))
                {
                        if ($_GET['lang'])
                        {
                                $_GET['lang'] = $_GET['lang'];
                        }
                        else
                        {
                                if (is_object($ilUser))
                                {
                                        $_GET['lang'] = $ilUser->getPref('language');
                                }
                        }
                }

                if (isset($_POST['change_lang_to']) && $_POST['change_lang_to'] != "")
                {
                        $_GET['lang'] = ilUtil::stripSlashes($_POST['change_lang_to']);
                }

                // prefer personal setting when coming from login screen
                // Added check for ilUser->getId > 0 because it is 0 when the language is changed and the terms of service should be displayes (Helmut Schottm��ller, 2006-10-14)
                if (is_object($ilUser) && $ilUser->getId() != ANONYMOUS_USER_ID && $ilUser->getId() > 0)
                {
                        ilSession::set('lang', $ilUser->getPref('language'));
                }

                ilSession::set('lang', (isset($_GET['lang']) && $_GET['lang']) ? $_GET['lang'] : ilSession::get('lang'));

                // check whether lang selection is valid
                require_once "./Services/Language/classes/class.ilLanguage.php";
                $langs = ilLanguage::getInstalledLanguages();
                if (!in_array(ilSession::get('lang'), $langs))
                {
                        if (is_object($ilSetting) && $ilSetting->get('language') != '')
                        {
                                ilSession::set('lang', $ilSetting->get('language'));
                        }
                        else
                        {
                                ilSession::set('lang', $langs[0]);
                        }
                }
                $_GET['lang'] = ilSession::get('lang');
                                                
                $lng = new ilLanguage(ilSession::get('lang'));
                self::initGlobal('lng', $lng);
                
                if(is_object($rbacsystem))
                {
                        $rbacsystem->initMemberView();
                }
        }

        protected static function initAccessHandling()
        {                               
                self::initGlobal("rbacreview", "ilRbacReview",
                        "./Services/AccessControl/classes/class.ilRbacReview.php");
                
                require_once "./Services/AccessControl/classes/class.ilRbacSystem.php";
                $rbacsystem = ilRbacSystem::getInstance();
                self::initGlobal("rbacsystem", $rbacsystem);
                
                self::initGlobal("rbacadmin", "ilRbacAdmin",
                         "./Services/AccessControl/classes/class.ilRbacAdmin.php");
                
                self::initGlobal("ilAccess", "ilAccessHandler", 
                         "./Services/AccessControl/classes/class.ilAccessHandler.php");
                
                require_once "./Services/AccessControl/classes/class.ilConditionHandler.php";
        }
        
        protected static function initLog() 
        {               
                require_once "./Services/Logging/classes/class.ilLog.php";
                try
                {
                        $log = new ilLog(ILIAS_LOG_DIR,ILIAS_LOG_FILE,CLIENT_ID,ILIAS_LOG_ENABLED,ILIAS_LOG_LEVEL);                             
                }
                catch(ilLogException $e)
                {
                        self::abortAndDie($e->getMessage());
                }
                self::initGlobal("ilLog", $log);
                // deprecated
                self::initGlobal("log", $log);
        }
        
        protected static function initGlobal($a_name, $a_class, $a_source_file = null)
        {
                if($a_source_file)
                {
                        include_once $a_source_file;
                        $GLOBALS[$a_name] = new $a_class;
                }
                else
                {
                        $GLOBALS[$a_name] = $a_class;
                }
        }
                        
        protected static function abortAndDie($a_message)
        {               
                if(is_object($GLOBALS['ilLog']))
                {
                        $GLOBALS['ilLog']->write("Fatal Error: ilInitialisation - ".$a_message);
                }
                die($a_message);
        }
        
        protected static function handleDevMode()
        {
                if(defined(SHOWNOTICES) && SHOWNOTICES)
                {
                        // no further differentiating of php version regarding to 5.4 neccessary
                        // when the error reporting is set to E_ALL anyway
                        
                        // remove notices from error reporting
                        if (version_compare(PHP_VERSION, '5.3.0', '>='))
                        {
                                error_reporting(E_ALL);
                        }
                        else
                        {
                                error_reporting(E_ALL);
                        }
                }

                include_once "include/inc.debug.php";
        }
        
        protected static $already_initialized;
        
        public static function initILIAS()
        {
                if (self::$already_initialized) 
                {
                        return;
                }

                self::$already_initialized = true;

                global $tree;
                
                self::initCore();
                                
                if(ilContext::initClient())
                {
                        self::initClient();

                        if (ilContext::hasUser())
                        {                                               
                                self::initUser();
                                
                                if(ilContext::doAuthentication())
                                {
                                        self::authenticate();
                                }                               
                        }       

                        // init after Auth otherwise breaks CAS
                        self::includePhp5Compliance();
                        
                        // language may depend on user setting
                        self::initLanguage();
                        $tree->initLangCode();

                        if(ilContext::hasHTML())
                        {                                                                                                       
                                include_once('./Services/WebServices/ECS/classes/class.ilECSTaskScheduler.php');
                                ilECSTaskScheduler::start();                                    
                                
                                self::initHTML();               
                        }                                                       
                }                                       
        }
        
        protected static function initCore()
        {
                global $ilErr;
                
                // remove notices from error reporting
                if (version_compare(PHP_VERSION, '5.4.0', '>='))
                {
                        // Prior to PHP 5.4.0 E_ALL does not include E_STRICT.
                        // With PHP 5.4.0 and above E_ALL >DOES< include E_STRICT.
                        
                        error_reporting(((ini_get("error_reporting") & ~E_NOTICE) & ~E_DEPRECATED) & ~E_STRICT);
                }
                elseif (version_compare(PHP_VERSION, '5.3.0', '>='))
                {
                        error_reporting((ini_get("error_reporting") & ~E_NOTICE) & ~E_DEPRECATED);
                }
                else
                {
                        error_reporting(ini_get('error_reporting') & ~E_NOTICE);
                }
                // breaks CAS: must be included after CAS context isset in AuthUtils
                //self::includePhp5Compliance();

                self::requireCommonIncludes();
                
                
                // error handler 
                self::initGlobal("ilErr", "ilErrorHandling", 
                        "./Services/Init/classes/class.ilErrorHandling.php");
                $ilErr->setErrorHandling(PEAR_ERROR_CALLBACK, array($ilErr, 'errorHandler'));           
                
                // :TODO: obsolete?
                PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, array($ilErr, "errorHandler"));
                                        
                // workaround: load old post variables if error handler 'message' was called
                include_once "Services/Authentication/classes/class.ilSession.php";
                if (ilSession::get("message"))
                {
                        $_POST = ilSession::get("post_vars");
                }
                                        
                self::removeUnsafeCharacters();

                self::initIliasIniFile();

                
                // deprecated
                self::initGlobal("ilias", "ILIAS", "./Services/Init/classes/class.ilias.php");                          
        }
        
        protected static function initClient()
        {
                global $https, $ilias; 
                
                self::determineClient();

                self::initClientIniFile();
                                
                
                // --- needs client ini         
                
                $ilias->client_id = CLIENT_ID;
                
                if (DEVMODE)
                {
                        self::handleDevMode();
                }                                               
        
                self::initLog();                

                self::handleMaintenanceMode();

                self::initDatabase();
                
                
                // --- needs database
                
                self::initGlobal("ilAppEventHandler", "ilAppEventHandler",
                        "./Services/EventHandling/classes/class.ilAppEventHandler.php");

                // there are rare cases where initILIAS is called twice for a request
                // example goto.php is called and includes ilias.php later
                // we must prevent that ilPluginAdmin is initialized twice in
                // this case, since this won't get the values out of plugin.php the
                // second time properly
                if (!is_object($GLOBALS["ilPluginAdmin"]))
                {
                        self::initGlobal("ilPluginAdmin", "ilPluginAdmin",
                                "./Services/Component/classes/class.ilPluginAdmin.php");
                }

                self::setSessionHandler();

                self::initSettings();
                
                
                // --- needs settings   
                
                self::initLocale();                             
                                                
                if(ilContext::usesHTTP())
                {
                        // $https 
                        self::initGlobal("https", "ilHTTPS", "./Services/Http/classes/class.ilHTTPS.php");
                        $https->enableSecureCookies();
                        $https->checkPort();    
                }               
                

                // --- object handling          
                
                self::initGlobal("ilObjDataCache", "ilObjectDataCache",
                        "./Services/Object/classes/class.ilObjectDataCache.php");
                                                                                                
                // needed in ilObjectDefinition
                require_once "./Services/Xml/classes/class.ilSaxParser.php";
                
                self::initGlobal("objDefinition", "ilObjectDefinition",
                        "./Services/Object/classes/class.ilObjectDefinition.php");
                
                // $tree
                require_once "./Services/Tree/classes/class.ilTree.php";
                $tree = new ilTree(ROOT_FOLDER_ID);
                self::initGlobal("tree", $tree);
                unset($tree);

                self::initGlobal("ilCtrl", "ilCtrl",
                                "./Services/UICore/classes/class.ilCtrl.php");

                self::setCookieParams();
        }
        
        protected static function initUser()
        {
                global $ilias, $ilAuth, $ilUser;
                
                if(ilContext::usesHTTP())
                {                                                               
                        // allow login by submitting user data
                        // in query string when DEVMODE is enabled
                        if( DEVMODE
                                && isset($_GET['username']) && strlen($_GET['username'])
                                && isset($_GET['password']) && strlen($_GET['password'])
                        ){
                                $_POST['username'] = $_GET['username'];
                                $_POST['password'] = $_GET['password'];
                        }                                                                               
                }               

                // $ilAuth 
                require_once "Auth/Auth.php";
                require_once "./Services/AuthShibboleth/classes/class.ilShibboleth.php";                
                include_once("./Services/Authentication/classes/class.ilAuthUtils.php");
                ilAuthUtils::_initAuth();
                $ilias->auth = $ilAuth;

                // $ilUser 
                self::initGlobal("ilUser", "ilObjUser", 
                        "./Services/User/classes/class.ilObjUser.php");
                $ilias->account =& $ilUser;
                                
                self::initAccessHandling();

                
                // force login
                if ((isset($_GET["cmd"]) && $_GET["cmd"] == "force_login"))
                {                       
                        $ilAuth->logout();
                        
                        // we need to do this for the session statistics
                        // could we use session_destroy() instead?
                        // [this is done after every $ilAuth->logout() call elsewhere] 
                        ilSession::_destroy(session_id(), ilSession::SESSION_CLOSE_LOGIN);

                        // :TODO: keep session because of cart content?
                        if(!isset($_GET['forceShoppingCartRedirect']))
                        {
                                $_SESSION = array();
                        }
                        else
                        {
                                ilSession::set("AccountId", "");        
                        }
                }               
                
        }

        public static function authenticate()
        {
                global $ilAuth, $ilias, $ilErr;
                
                $current_script = substr(strrchr($_SERVER["PHP_SELF"], "/"), 1);                
                
                if(self::blockedAuthentication($current_script))
                {
                        return;
                }
                                                
                $oldSid = session_id();         
                
                $ilAuth->start();
                $ilias->setAuthError($ilErr->getLastError());
                                
                if(IS_PAYMENT_ENABLED)
                {
                        // cart is "attached" to session, has to be updated
                        $newSid = session_id();
                        if($oldSid != $newSid)
                        {
                                include_once './Services/Payment/classes/class.ilPaymentShoppingCart.php';
                                ilPaymentShoppingCart::_migrateShoppingCart($oldSid, $newSid);
                        }
                }                                       
                
                if($ilAuth->getAuth() && $ilAuth->getStatus() == '')
                {
                        self::initUserAccount();
                        
                        self::handleAuthenticationSuccess();
                }                       
                else 
                {                                                                       
                        if (!self::showingLoginForm($current_script))
                        {                                                               
                                // :TODO: should be moved to context?!
                                $mandatory_auth = ($current_script != "shib_login.php"
                                                && $current_script != "shib_logout.php"
                                                && $current_script != "error.php"
                                                && $current_script != "chat.php"
                                                && $current_script != "index.php"); // #10316
                                
                                if($mandatory_auth)
                                {
                                        self::handleAuthenticationFail();
                                }
                        }               
                }                                       
        }

        protected static function handleAuthenticationSuccess()
        {
                global $ilUser;

                require_once 'Services/Tracking/classes/class.ilOnlineTracking.php';
                ilOnlineTracking::updateAccess($ilUser);
        }

        protected static function handleAuthenticationFail()
        {
                global $ilAuth, $ilSetting;
                                                
                // #10608
                if(ilContext::getType() == ilContext::CONTEXT_SOAP)
                {
                        throw new Exception("Authentication failed.");
                }                               

                $status = $ilAuth->getStatus();

                if($ilSetting->get('pub_section') &&
                        ($status == '' || $status == AUTH_EXPIRED || $status == AUTH_IDLED) &&
                        $_GET['reloadpublic'] != '1'
                )
                {
                        self::goToPublicSection($status);
                }
                else
                {
                        self::goToLogin($status);
                }
        }
        
        protected static function initHTML()
        {
                global $ilUser;
                
                if(ilContext::hasUser())
                {
                        // load style definitions
                        // use the init function with plugin hook here, too
                        self::initStyle();
                }

                // $tpl
                $tpl = new ilTemplate("tpl.main.html", true, true);
                self::initGlobal("tpl", $tpl);
                if(ilContext::hasUser() && ilContext::doAuthentication())
                {
                        global $ilUser, $ilCtrl;

                        require_once 'Services/User/classes/class.ilUserRequestTargetAdjustment.php';
                        $request_adjuster = new ilUserRequestTargetAdjustment($ilUser, $ilCtrl);
                        $request_adjuster->adjust();
                }
                
                // load style sheet depending on user's settings
                $location_stylesheet = ilUtil::getStyleSheetLocation();
                $tpl->setVariable("LOCATION_STYLESHEET",$location_stylesheet);                          
                
                require_once "./Services/UICore/classes/class.ilFrameTargetInfo.php";                           
                                
                self::initGlobal("ilNavigationHistory", "ilNavigationHistory",
                                "Services/Navigation/classes/class.ilNavigationHistory.php");

                self::initGlobal("ilBrowser", "ilBrowser", 
                        "./Services/Utilities/classes/class.ilBrowser.php");

                self::initGlobal("ilHelp", "ilHelpGUI", 
                        "Services/Help/classes/class.ilHelpGUI.php");

                self::initGlobal("ilToolbar", "ilToolbarGUI", 
                        "./Services/UIComponent/Toolbar/classes/class.ilToolbarGUI.php");       

                self::initGlobal("ilLocator", "ilLocatorGUI", 
                        "./Services/Locator/classes/class.ilLocatorGUI.php");

                self::initGlobal("ilTabs", "ilTabsGUI", 
                        "./Services/UIComponent/Tabs/classes/class.ilTabsGUI.php");

                if(ilContext::hasUser())
                {
                        // $ilMainMenu
                        include_once './Services/MainMenu/classes/class.ilMainMenuGUI.php';
                        $ilMainMenu = new ilMainMenuGUI("_top");
                        self::initGlobal("ilMainMenu", $ilMainMenu);
                        unset($ilMainMenu);
        

                        // :TODO: tableGUI related

                        // set hits per page for all lists using table module
                        $_GET['limit'] = (int) $ilUser->getPref('hits_per_page');
                        ilSession::set('tbl_limit', $_GET['limit']);

                        // the next line makes it impossible to save the offset somehow in a session for
                        // a specific table (I tried it for the user administration).
                        // its not posssible to distinguish whether it has been set to page 1 (=offset = 0)
                        // or not set at all (then we want the last offset, e.g. being used from a session var).
                        // So I added the wrapping if statement. Seems to work (hopefully).
                        // Alex April 14th 2006
                        if (isset($_GET['offset']) && $_GET['offset'] != "")                                                    // added April 14th 2006
                        {
                                $_GET['offset'] = (int) $_GET['offset'];                // old code
                        }
                }
                else
                {
                        // several code parts rely on ilObjUser being always included
                        include_once "Services/User/classes/class.ilObjUser.php";
                }
        }
        
        protected static function getCurrentCmd()
        {
                $cmd = $_REQUEST["cmd"];
                if(is_array($cmd))
                {
                        return array_shift(array_keys($cmd));
                }
                else 
                {
                        return $cmd;
                }
        }
        
        protected static function blockedAuthentication($a_current_script)
        {               
                if($a_current_script == "register.php" || 
                        $a_current_script == "pwassist.php" ||
                        $a_current_script == "confirmReg.php" ||
                        $a_current_script == "il_securimage_play.php" ||
                        $a_current_script == "il_securimage_show.php") 
                {
                        return true;
                }
                
                if($_REQUEST["baseClass"] == "ilStartUpGUI")
                {
                        $cmd_class = $_REQUEST["cmdClass"];
                        
                        if($cmd_class == "ilaccountregistrationgui" ||
                                $cmd_class == "ilpasswordassistancegui")
                        {
                                return true;
                        }
                        
                        $cmd = self::getCurrentCmd();
                        if($cmd == "showTermsOfService" || $cmd == "showClientList" || 
                                $cmd == 'showAccountMigration' || $cmd == 'migrateAccount' ||
                                $cmd == 'processCode')
                        {
                                return true;
                        }
                }
                
                // #12884
                if(($a_current_script == "goto.php" && $_GET["target"] == "impr_0") ||
                        $_GET["baseClass"] == "ilImprintGUI")
                {
                        return true;
                }
                
                return false;
        }
        
        protected static function showingLoginForm($a_current_script)
        {               
                if($a_current_script == "login.php")
                {
                        return true;
                }
                
                if($_REQUEST["baseClass"] == "ilStartUpGUI" && 
                        self::getCurrentCmd() == "showLogin")
                {       
                        return true;                                    
                }
                
                return false;
        }
        
        protected static function translateMessage($a_message_id, array $a_message_static = null)
        {
                global $ilDB, $lng, $ilSetting, $ilClientIniFile, $ilUser;
                        
                // current language
                if(!$lng)
                {
                        $lang = "en";
                        if($ilUser)
                        {
                                $lang = $ilUser->getLanguage();
                        }
                        else if($_REQUEST["lang"])
                        {
                                $lang = (string)$_REQUEST["lang"];
                        }
                        else if($ilSetting)
                        {
                                $lang = $ilSetting->get("language");
                        }
                        else if($ilClientIniFile)
                        {
                                $lang = $ilClientIniFile->readVariable("language", "default");
                        }                       
                }
                else
                {
                        $lang = $lng->getLangKey();
                }

                $message = "";
                if($ilDB && $a_message_id)
                {       
                        if(!$lng)
                        {
                                require_once "./Services/Language/classes/class.ilLanguage.php";
                                $lng = new ilLanguage($lang);
                        }
                                        
                        $lng->loadLanguageModule("init");
                        $message = $lng->txt($a_message_id);    
                }
                else if(is_array($a_message_static))
                {
                        if(!isset($a_message_static[$lang]))
                        {
                                $lang = "en";
                        }
                        $message = $a_message_static[$lang];
                }
        
                return utf8_decode($message);
        }
        
        protected static function redirect($a_target, $a_message_id, $a_message_static)
        {               
                // #12739
                if(defined("ILIAS_HTTP_PATH") &&
                        !stristr($a_target, ILIAS_HTTP_PATH))
                {
                        $a_target = ILIAS_HTTP_PATH."/".$a_target;
                }
                
                if(ilContext::supportsRedirects())
                {
                        ilUtil::redirect($a_target);
                }               
                else
                {                       
                        $message = self::translateMessage($a_message_id, $a_message_static);
                        
                        // user-directed linked message
                        if(ilContext::usesHTTP() && ilContext::hasHTML())
                        {                                                               
                                $link = self::translateMessage("init_error_redirect_click", 
                                        array("en" => 'Please click to continue.',
                                                "de" => 'Bitte klicken um fortzufahren.'));                             
                                $mess = $message.
                                        '<br /><a href="'.$a_target.'">'.$link.'</a>';                                  
                        }
                        // plain text 
                        else
                        {                                                                       
                                // not much we can do here
                                $mess = $message;               
                                
                                if(!trim($mess))
                                {
                                        $mess = self::translateMessage("init_error_redirect_info", 
                                                array("en" => 'Redirect not supported by context.',
                                                        "de" => 'Weiterleitungen werden durch Kontext nicht unterstützt.')).
                                        ' ('.$a_target.')';                                     
                                }
                        }
                                                                        
                        self::abortAndDie($mess);                       
                }
        }
}

?>