guest.php

<?php
// enable display errors only on dev systems
ini_set('display_errors', 1);
//ini_set('error_reporting', 5);

use BigBlueButton\Core\Record;
use BigBlueButton\Parameters\CreateMeetingParameters;
use BigBlueButton\Responses\GetMeetingsResponse;
use BigBlueButton\Responses\GetRecordingsResponse;
use BigBlueButton\Parameters\DeleteRecordingsParameters;
use ILIAS\DI\Container;

$directory = strstr($_SERVER['SCRIPT_FILENAME'], 'Customizing', true);
if(empty($directory))
{
	$directory = getcwd();
}
chdir($directory);

require_once('./Services/Context/classes/class.ilContext.php');
require_once("./Services/Init/classes/class.ilInitialisation.php");
require_once("./Services/Utilities/classes/class.ilUtil.php");
require_once('./Services/Language/classes/class.ilLanguage.php');
//require_once("./Services/Utilities/classes/class.ilBrowser.php");
require_once './Customizing/global/plugins/Services/Repository/RepositoryObject/BigBlueButton/classes/class.ilBigBlueButtonProtocol.php';
require_once './Customizing/global/plugins/Services/Repository/RepositoryObject/BigBlueButton/vendor/autoload.php';


class ilInitialisationGuest extends ilInitialisation
{

    protected static function getIniHost(): string
    {
        // Create ini-handler (onces)
        self::initIliasIniFile();
        global $ilIliasIniFile;
        // Return [server] -> 'http_path' variable from 'ilias.init.php'
        $http_path = $ilIliasIniFile->readVariable('server', 'http_path');
        // Strip http:// & https://
        if (strpos($http_path, 'https://') !== false)
            $http_path = substr($http_path, 8);
        if (strpos($http_path, 'http://') !== false)
            $http_path = substr($http_path, 7);
        // Return clean host
        return $http_path;
    }

    public static function initIlias($client_id=null, $client_token=null): void
    {

	if(empty($client_id))
	{
		throw new \Exception("There has been an error. Try it again.");
	}
        define ("CLIENT_ID", $client_id);
        ilContext::init(\ilContext::CONTEXT_SCORM);
        //UK
        ilInitialisation::initILIAS();
        ilInitialisation::buildHTTPPath();
    }

    /**
     * Function; initGlobal($a_name, $a_class, $a_source_file)
     *  Derive from protected to public...
     *
     * @see \ilInitialisation::initGlobal($a_name, $a_class, $a_source_file, $destroy_existing)
     */
    public static function initGlobal($a_name, $a_class, $a_source_file = null, ?bool $destroy_existing = false): void
    {
        parent::initGlobal($a_name, $a_class, $a_source_file, $destroy_existing);
    }

    /**
     * Function: initDatabase()
     *  Derive from protected to public...
     *
     * @see \ilInitialisation::initDatabase()
     */
    public static function initDatabase(): void
    {
        if (!isset($GLOBALS['ilDB'])) {
            parent::initGlobal("ilBench", "ilBenchmark", "./Services/Utilities/classes/class.ilBenchmark.php");
            parent::initDatabase();
        }
    }

    /**
     * Function: initIliasIniFile()
     *  Derive from protected to public...
     *
     * @see \ilInitialisation::initIliasIniFile()
     */
    public static function initIliasIniFile(): void
    {
        if (!isset($GLOBALS['ilIliasIniFile'])) {
            parent::initIliasIniFile();
        }
    }

    /**
     * Function: initClientIniFile()
     *  Derive from protected to public...
     *
     * @see \ilInitialisation::initIliasIniFile()
     */
    public static function initClientIniFile(): void
    {
        if (!isset($GLOBALS['initClientIniFile'])) {
            parent::initClientIniFile();
        }
    }


    public static function initLog(): void
    {
        if (!isset($GLOBALS['ilLog'])) {
            parent::initLog();
            parent::initGlobal("ilAppEventHandler", "ilAppEventHandler", "./Services/EventHandling/classes/class.ilAppEventHandler.php");
        }
    }
}


class GuestLink
{
    const DEFAULT_LANG = 'de';

    const PLUGIN_DIR = 'Customizing/global/plugins/Services/Repository/RepositoryObject/BigBlueButton';

    /** @var GuestLink|null $instance */
    static private $instance;

    /** @var Container $dic */
    private $dic;

    /** @var ilUtil $ilUtil */
    private $ilUtil;


    private $bbb;

    /** @var int $refId */
    private $refId = 0;

    /** @var string $client */
    private $client;

    /** @var ilObjBigBlueButton $object */
    private $pluginObject;
    /** @var ilBigBlueButtonProtocol $object */
    private $pluginHelper;

    /** @var ilBigBlueButtonConfig $settings */
    private $pluginConfig;

    /** @var string $meetingId */
    private $meetingId = 0;

    /** @var string $attendeePwd */
    private $attendeePwd;

    /** @var string $urlJoinMeeting */
    private $urlJoinMeeting;

    /** @var string $iliasDomain */
    private $iliasDomain;

    private $form;

    /** @var string $userTitle */
    private $userTitle = '';

    /** @var string $displayName */
    private $displayName = '';

    /** @var string|null $guestPassword */
    private $guestPassword = null;

    /** @var string[] $userAccept */
    private $userAccept = [
        'termsOfUse' => false
    ];

    /** @var bool[] $errState */
    private $errState = [
        'displayname'  => false,
        'termsOfUse' => false,
        'moderator' => false,
        'userLimit' => false
    ];

    /** @var string $userLang */
    private $userLang = 'de';

    /** @var string[] $isoLangCode */
    private $isoLangCode = [
        'de' => 'de-DE',
        'en' => 'en-US'
    ];

    /** @var array $langVar */
    private $langVar = [];

    /** @var array $formField */
    private $formField = [];

    /** @var ilTemplate $htmlTpl */
    private $htmlTpl;




    // BigBlueButton

    private function setMeetingId(): void
    {
        global $ilIliasIniFile;
		$this->iliasDomain = $ilIliasIniFile->readVariable('server', 'http_path');
		$this->iliasDomain = preg_replace("/^(https:\/\/)|(http:\/\/)+/", "", $this->iliasDomain);

		$rawMeetingId = $this->iliasDomain . ';' . $this->client . ';' . $this->pluginObject->getBBBId();
        $this->meetingId = $this->pluginObject->getBBBId();//$rawMeetingId;
    }

    private function isMeetingRunning(): bool
    {
        try {
            $meetingParams = new \BigBlueButton\Parameters\IsMeetingRunningParameters($this->meetingId);
            $response = $this->bbb->isMeetingRunning($meetingParams);
            $running = $response->isRunning();
        } catch (Exception $e) {
            $running = false;
        }
        return $running;
    }

    private function getUrlJoinMeeting(): bool
    {
        global $DIC;
        if( !$this->isMeetingRunning() ) {
            return false;
        }
        $joinParams = new \BigBlueButton\Parameters\JoinMeetingParameters($this->meetingId, trim($this->userTitle . ' ') . $this->displayName, $this->attendeePwd);
        $joinParams->setRedirect(true)->setRole('VIEWER')->setClientURL($this->dic->http()->request()->getUri());

        if( (bool)strlen($this->urlJoinMeeting = $this->bbb->getJoinMeetingURL($joinParams)) )
        {
            return true;
        }
        return false;
    }



    // Header-Redirect to BBB

    private function redirectToVc(): void {
        header('Status: 303 See Other', false, 303);
        header('Location:' . $this->urlJoinMeeting);
        exit;
    }



    // Language Vars & HTML-Form

    private function setFormElements() {
        $input = function($name, $value, $type = 'text', $title = '', $class="", $addAttr = "") {
            return '<input type="' . $type . '" name="' . $name . '" value="' . $value . '" title="' . $title . '" placeholder="' . $title . '" class="' . $class . '"' . $addAttr . ' />';
        };
        $this->formField = [
            'user_title' => $input('user_title', $this->userTitle, 'text', 'Titel'),
            'display_name' => $input('display_name', $this->displayName, 'text', $this->getLangVar('guest_displayname_input'), 'form-control'),
            'submit' => $input('submit', $this->getLangVar('btntext_join_meeting'), 'submit', $this->getLangVar('btntext_join_meeting'), 'btn btn-primary'),
            'guest_password' => $input('guest_password', $this->guestPassword, 'password', $this->getLangVar('guest_password_input'), 'form-control', ' autocomplete="new-password"'),
            'guest_password_hidden' => $input('guest_password', $this->pluginObject->getAccessToken(), 'hidden', $this->getLangVar('guest_password_input'), 'form-control'),
            'guest_login_button' => $input('guest_login_button', $this->getLangVar('btntext_guest_login_button'), 'submit', $this->getLangVar('btntext_guest_login'), 'btn btn-primary'),
        ];

    }

    private function setHtmlDocument()
    {
		$http_base = ILIAS_HTTP_PATH;
		if (strpos($http_base,'/m/')) {
			$http_base = strstr($http_base,'/m/',true).'/Customizing/global/plugins/Services/Repository/RepositoryObject/BigBlueButton';
		}

        $this->htmlTpl = new ilTemplate( dirname(__FILE__) . '/' . 'templates/tpl.guest.html', true, true);
        $this->htmlTpl->setVariable('USER_LANG', $this->isoLangCode[$this->userLang]);
        $this->htmlTpl->setVariable('HTTP_BASE', $http_base);
        $this->htmlTpl->setVariable('MEETING_TITLE', $this->getMeetingTitle());// . ' - ' . $this->getLangVar('big_blue_button'));
        $this->htmlTpl->setVariable('INFO_TOP_MODERATED_M', $this->getLangVar('top_moderated_m'));
        $this->htmlTpl->setVariable('ERR_STATE_INPUT_FIELD', (int)$this->errState['displayname']);
        $this->htmlTpl->setVariable('ERR_MSG_INPUT_FIELD', !$this->errState['displayname'] ? '' : $this->getLangVar('err_msg_displayname'));
        $this->htmlTpl->setVariable('ERR_STATE_USER_LIMIT', (int)$this->errState['userLimit'] );
        $this->htmlTpl->setVariable('ERR_MSG_USER_LIMIT', !$this->errState['userLimit'] ? '': $this->pluginConfig->getMaxConcurrentSessionsMsg());
        $this->htmlTpl->setVariable('ERR_STATE_TERMSOFUSE', (int)$this->errState['termsOfUse']);
        $this->htmlTpl->setVariable('VAL_TERMSOFUSE', (int)$this->userAccept['termsOfUse']);
        $this->htmlTpl->setVariable('TXT_ACCEPT_TERMSOFUSE', $this->getLangVar('terms_of_use') );
        $this->htmlTpl->setVariable('ERR_STATE_MODERATOR', (int)$this->errState['moderator']);
        $this->htmlTpl->setVariable('ERR_MSG_MODERATOR', !$this->errState['moderator'] ? '' : $this->getLangVar('wait_join_meeting'));
        $this->htmlTpl->setVariable('FORM_ACTION', filter_var('https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'], FILTER_SANITIZE_URL));
        $this->htmlTpl->setVariable('INFO_BOTTOM', $this->getLangVar('join_info'));
        $this->htmlTpl->setVariable('INFO_REQUIREMENTS', $this->getLangVar('tech_requirements_info'));


        if( $this->isUserLoggedIn() ) {
            #ilSession::set('guestLoggedIn', false);
            $this->htmlTpl->setVariable('INPUT_FIELD', $this->getFormField('display_name'));
            $this->htmlTpl->setVariable('SUBMIT_BUTTON', $this->getFormField('guest_password_hidden') . $this->getFormField('submit'));
        }
        // GUEST PASSWORD/LOGIN
        if( $this->isPwEnabled() && !$this->isUserLoggedIn() ) {
            if( isset($_POST['guest_password']) ) {
                $this->htmlTpl->setVariable('ERR_STATE_INPUT_FIELD', 1);
                $this->htmlTpl->setVariable('ERR_MSG_INPUT_FIELD', $this->getLangVar('err_msg_guest_password'));
            }
            $this->htmlTpl->setVariable('INPUT_FIELD', $this->getFormField('guest_password'));
            $this->htmlTpl->setVariable('INPUT_FIELD_INFO', $this->getLangVar('guest_password_input_info'));
            $this->htmlTpl->setVariable('SUBMIT_BUTTON', $this->getFormField('guest_login_button'));
        }

    }

    private function isPwEnabled() {
        return (bool)strlen(trim($this->pluginObject->getAccessToken()));
    }

    private function isUserLoggedIn() {
        return ilSession::get('guestLoggedIn');
    }

    private function checkPw( ?string $phrase = null ) {
        return trim($phrase) === trim($this->pluginObject->getAccessToken());
    }

    private function setGuestLoginState() {
        $phrase = isset($_POST['guest_password']) ? filter_var($_POST['guest_password'], FILTER_SANITIZE_ENCODED) : '';
        if( $this->isUserLoggedIn() || $this->checkPw($phrase) ) {
            ilSession::set('guestLoggedIn', true);
        } else {
            ilSession::set('guestLoggedIn', false);
        }
    }


    private function getFormField($fieldName) {
        return strlen($field = $this->formField[$fieldName]) ? $field : '';
    }

    private function getMeetingTitle()
    {
        return $this->pluginObject->getTitle();
    }

    private function assignTranslatedLangVars()
    {
        $langFilePath = dirname(__FILE__) . '/lang/';

        // lang files
        $deLangFileName = $langFilePath . 'ilias_de.lang';
        $enLangFileName = $langFilePath . 'ilias_en.lang';

        // file content
        $deLangFileContent = file_get_contents($deLangFileName);
        $enLangFileContent = file_get_contents($enLangFileName);

        // content lines 2 array
        $deLangFileContentArr = explode("\n", $deLangFileContent);
        $enLangFileContentArr = explode("\n", $enLangFileContent);

        // build array with langVarKeys
        $enLangKeyVal = [];
        $i = 0;
        foreach( $deLangFileContentArr as $line ) {
            if( substr_count($line, '#:#') ) {
                list($key, $value) = explode('#:#', $line);
                $enLangKeyVal[] = trim($key) . '#:#' . trim($enLangFileContentArr[$i]);
                $i++;
            }
        }

        echo implode("\n", $enLangKeyVal);



    }

    private function getLangVar(string $value): string
    {
        return ilLanguage::_lookupEntry( $this->userLang, 'rep_robj_xbbb','rep_robj_xbbb_' . $value);
    }

    private function setUserLangBySvrParam(): void
    {
        if( isset($this->dic->http()->request()->getServerParams()['HTTP_ACCEPT_LANGUAGE']) && strlen($this->dic->http()->request()->getServerParams()['HTTP_ACCEPT_LANGUAGE']) >= 2 ) {
            $this->userLang = substr($this->dic->http()->request()->getServerParams()['HTTP_ACCEPT_LANGUAGE'], 0, 2);
        }
    }

    private function setLangVars(): void
    {
        $langFilePath = dirname(__FILE__) . '/lang/';
        $langFileName = 'ilias_' . $this->userLang . '.lang';
        $langPathFile = $langFilePath . $langFileName;
        if( !file_exists($langPathFile) ) {
            $langPathFile = $langFilePath . 'ilias_' . self::DEFAULT_LANG . '.lang';
        }
        if( file_exists($langPathFile) ) {
            $langFileContent = file_get_contents($langPathFile);
            foreach( explode("\n", $langFileContent) as $line ) {
                if( substr_count($line, '#:#') ) {
                    list($key, $value) = explode('#:#', $line);
                    $this->langVar[trim($key)] = trim($value);
                }
            }
        }
    }
    // validation checks

    private function checkPostRequest()
    {
        $score = 0;

        if( is_array($_POST) ) {
            foreach($_POST as $key => $val) {
                if( filter_var($key, FILTER_SANITIZE_STRING) === 'display_name' ) {
                    $this->displayName = filter_var($val, FILTER_SANITIZE_STRING);
                    $score += 2;
                }
            }
            if( !(bool)strlen($this->displayName) ) {
                $score -= 2;
                $this->errState['displayname'] = isset($_POST['display_name']);
            }
        }

        return $score >= 0;
    }

    private function validateInvitation()
    {
        switch( true ) {
            case $this->pluginConfig->isGuestGlabalAllowed() && $this->pluginObject->isGuestLinkAllowed():
                break;
            default:
                $this->httpExit(403);
        }
    }

    private function httpExit(int $code = 404)
    {
        $text = [
            403 => 'Forbidden',
            404 => 'Not Found'
        ];
        $protocol = (isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0');
        http_response_code($code);
        header($protocol . ' ' . $code . ' ' . $text[$code]);
        exit;
    }

    private function __construct()
    {
        $this->client = isset($_GET['client_id']) ? filter_var($_GET['client_id'], FILTER_SANITIZE_STRING) : '';
        $this->refId = isset($_GET['ref_id']) ? filter_var($_GET['ref_id'], FILTER_SANITIZE_NUMBER_INT) : 0;
        ilInitialisationGuest::initIlias($this->client);
        global $DIC; /** @var Container $DIC */
        $this->dic = $DIC;

        try {
            $this->pluginObject = ilObjectFactory::getInstanceByRefId($this->refId);
        } catch (ilDatabaseException $e) {
        } catch (ilObjectNotFoundException $e) {
            $this->httpExit(404);
        }
        $this->pluginConfig = $this->pluginObject;
        $this->pluginHelper = new ilBigBlueButtonProtocol($this->pluginObject);

        // exit if not valid
        $this->validateInvitation();

        $this->setGuestLoginState();

        $this->setUserLangBySvrParam();
        // redirect to BBB if valid
        if( $this->checkPostRequest() ) {
            if($this->pluginObject->isMaxConcurrentSessionEnabled()){
                $available_sessions = $this->pluginHelper->getMaximumSessionsAvailable();
                if($available_sessions['max_sessions'] ||  (  key_exists($this->pluginObject->getBBBId(), $available_sessions['meetings']) && $available_sessions['meetings'][$this->pluginObject->getBBBId()]['userlimit'])){
                    $this->errState['userLimit'] = true;
                }
            }else if( !$this->errState['displayname'] ) {
                $this->bbb = new ilBBB($this->pluginConfig->getSvrSalt(), $this->pluginConfig->getSvrPublicUrl());
                $this->attendeePwd = $this->pluginObject->getAttendeePwd();
                $this->setMeetingId();
                if( $this->getUrlJoinMeeting() ) {
                    $this->redirectToVc();
                }
                $this->errState['moderator'] = true;
            }
        }


        $this->setFormElements();
        $this->setHtmlDocument();

    }

    public static function init()
    {
        if( self::$instance instanceof GuestLink) {
            return self::$instance;
        }
        return self::$instance = new self();
    }

    public function __toString(): string
    {
        return $this->htmlTpl->get();
    }

}

echo GuestLink::init();