LoginController.php

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<?php
namespace TYPO3\CMS\Backend\Controller;

use TYPO3\CMS\Backend\Utility\BackendUtility;
use TYPO3\CMS\Backend\Utility\IconUtility;
use TYPO3\CMS\Core\Html\HtmlParser;
use TYPO3\CMS\Core\Messaging\FlashMessage;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Utility\HttpUtility;

class LoginController {

    const SIGNAL_RenderLoginForm = 'renderLoginForm';

    // Internal, GPvars:
    // GPvar: redirect_url; The URL to redirect to after login.
    public $redirect_url;

    // GPvar: Defines which interface to load (from interface selector)
    public $GPinterface;

    // GPvar: preset username
    public $u;

    // GPvar: preset password
    public $p;

    protected $openIdUrl;

    // GPvar: If "L" is "OUT", then any logged in used is logged out. If redirect_url is given, we redirect to it
    public $L;

    // Login-refresh boolean; The backend will call this script with this value set when the login is close to being expired and the form needs to be redrawn.
    public $loginRefresh;

    // Value of forms submit button for login.
    public $commandLI;

    // Internal, static:
    // Set to the redirect URL of the form (may be redirect_url or "backend.php")
    public $redirectToURL;

    // Internal, dynamic:
    // Content accumulation
    public $content;

    // A selector box for selecting value for "interface" may be rendered into this variable
    public $interfaceSelector;

    // A selector box for selecting value for "interface" may be rendered into this variable
    // this will have an onchange action which will redirect the user to the selected interface right away
    public $interfaceSelector_jump;

    // A hidden field, if the interface is not set.
    public $interfaceSelector_hidden;

    // Additional hidden fields to be placed at the login form
    public $addFields_hidden = '';

    // sets the level of security. *'normal' = clear-text. 'challenged' = hashed
    // password/username from form in $formfield_uident. 'superchallenged' = hashed password hashed again with username.
    public $loginSecurityLevel = 'superchallenged';

    protected $signalSlotDispatcher;

    public function __construct() {
        $this->init();
    }

    public function init() {
        // We need a PHP session session for most login levels
        session_start();
        $this->redirect_url = GeneralUtility::sanitizeLocalUrl(GeneralUtility::_GP('redirect_url'));
        $this->GPinterface = GeneralUtility::_GP('interface');
        // Grabbing preset username and password, for security reasons this feature only works if SSL is used
        if (GeneralUtility::getIndpEnv('TYPO3_SSL')) {
            $this->u = GeneralUtility::_GP('u');
            $this->p = GeneralUtility::_GP('p');
            $this->openIdUrl = GeneralUtility::_GP('openid_url');
        }
        // If "L" is "OUT", then any logged in is logged out. If redirect_url is given, we redirect to it
        $this->L = GeneralUtility::_GP('L');
        // Login
        $this->loginRefresh = GeneralUtility::_GP('loginRefresh');
        // Value of "Login" button. If set, the login button was pressed.
        $this->commandLI = GeneralUtility::_GP('commandLI');
        // Sets the level of security from conf vars
        if ($GLOBALS['TYPO3_CONF_VARS']['BE']['loginSecurityLevel']) {
            $this->loginSecurityLevel = $GLOBALS['TYPO3_CONF_VARS']['BE']['loginSecurityLevel'];
        }
        // Try to get the preferred browser language
        $preferredBrowserLanguage = $GLOBALS['LANG']->csConvObj->getPreferredClientLanguage(GeneralUtility::getIndpEnv('HTTP_ACCEPT_LANGUAGE'));
        // If we found a $preferredBrowserLanguage and it is not the default language and no be_user is logged in
        // initialize $GLOBALS['LANG'] again with $preferredBrowserLanguage
        if ($preferredBrowserLanguage !== 'default' && empty($GLOBALS['BE_USER']->user['uid'])) {
            $GLOBALS['LANG']->init($preferredBrowserLanguage);
        }
        $GLOBALS['LANG']->includeLLFile('EXT:lang/locallang_login.xlf');
        // Setting the redirect URL to "backend.php" if no alternative input is given
        $this->redirectToURL = $this->redirect_url ?: 'backend.php';
        // Do a logout if the command is set
        if ($this->L == 'OUT' && is_object($GLOBALS['BE_USER'])) {
            $GLOBALS['BE_USER']->logoff();
            if ($this->redirect_url) {
                HttpUtility::redirect($this->redirect_url);
            }
            die;
        }
    }

    public function main() {
        // Initialize template object:
        $GLOBALS['TBE_TEMPLATE']->bodyTagAdditions = ' onload="startUp();"';
        $GLOBALS['TBE_TEMPLATE']->moduleTemplate = $GLOBALS['TBE_TEMPLATE']->getHtmlTemplate('EXT:backend/Resources/Private/Templates/login.html');
        $pageRenderer = $GLOBALS['TBE_TEMPLATE']->getPageRenderer();
        $pageRenderer->loadExtJS();
        $pageRenderer->loadPrototype();
        $pageRenderer->loadScriptaculous();
        // Set JavaScript for creating a MD5 hash of the password:
        $GLOBALS['TBE_TEMPLATE']->JScode .= $this->getJScode();
        // Checking, if we should make a redirect.
        // Might set JavaScript in the header to close window.
        $this->checkRedirect();
        // Initialize interface selectors:
        $this->makeInterfaceSelectorBox();
        // Creating form based on whether there is a login or not:
        if (empty($GLOBALS['BE_USER']->user['uid'])) {
            $GLOBALS['TBE_TEMPLATE']->form = $this->startForm();
            $loginForm = $this->makeLoginForm();
        } else {
            $GLOBALS['TBE_TEMPLATE']->form = '
                <form action="index.php" method="post" name="loginform">
                <input type="hidden" name="login_status" value="logout" />
                ';
            $loginForm = $this->makeLogoutForm();
        }
        // Starting page:
        $this->content .= $GLOBALS['TBE_TEMPLATE']->startPage('TYPO3 CMS Login: ' . $GLOBALS['TYPO3_CONF_VARS']['SYS']['sitename'], FALSE);
        // Add login form:
        $this->content .= $this->wrapLoginForm($loginForm);
        $this->content .= $GLOBALS['TBE_TEMPLATE']->endPage();
    }

    public function printContent() {
        echo $this->content;
    }

    /*****************************
     *
     * Various functions
     *
     ******************************/
    public function makeLoginForm() {
        $content = HtmlParser::getSubpart($GLOBALS['TBE_TEMPLATE']->moduleTemplate, '###LOGIN_FORM###');
        $markers = array(
            'VALUE_USERNAME' => htmlspecialchars($this->u),
            'VALUE_PASSWORD' => htmlspecialchars($this->p),
            'VALUE_OPENID_URL' => htmlspecialchars($this->openIdUrl),
            'VALUE_SUBMIT' => $GLOBALS['LANG']->getLL('labels.submitLogin', TRUE)
        );
        // Show an error message if the login command was successful already, otherwise remove the subpart
        if (!$this->isLoginInProgress()) {
            $content = HtmlParser::substituteSubpart($content, '###LOGIN_ERROR###', '');
        } else {
            $markers['ERROR_MESSAGE'] = $GLOBALS['LANG']->getLL('error.login', TRUE);
            $markers['ERROR_LOGIN_TITLE'] = $GLOBALS['LANG']->getLL('error.login.title', TRUE);
            $markers['ERROR_LOGIN_DESCRIPTION'] = $GLOBALS['LANG']->getLL('error.login.description', TRUE);
        }
        // Remove the interface selector markers if it's not available
        if (!($this->interfaceSelector && !$this->loginRefresh)) {
            $content = HtmlParser::substituteSubpart($content, '###INTERFACE_SELECTOR###', '');
        } else {
            $markers['LABEL_INTERFACE'] = $GLOBALS['LANG']->getLL('labels.interface', TRUE);
            $markers['VALUE_INTERFACE'] = $this->interfaceSelector;
        }
        return HtmlParser::substituteMarkerArray($content, $markers, '###|###');
    }

    public function makeLogoutForm() {
        $content = HtmlParser::getSubpart($GLOBALS['TBE_TEMPLATE']->moduleTemplate, '###LOGOUT_FORM###');
        $markers = array(
            'LABEL_USERNAME' => $GLOBALS['LANG']->getLL('labels.username', TRUE),
            'VALUE_USERNAME' => htmlspecialchars($GLOBALS['BE_USER']->user['username']),
            'VALUE_SUBMIT' => $GLOBALS['LANG']->getLL('labels.submitLogout', TRUE)
        );
        // Remove the interface selector markers if it's not available
        if (!$this->interfaceSelector_jump) {
            $content = HtmlParser::substituteSubpart($content, '###INTERFACE_SELECTOR###', '');
        } else {
            $markers['LABEL_INTERFACE'] = $GLOBALS['LANG']->getLL('labels.interface', TRUE);
            $markers['VALUE_INTERFACE'] = $this->interfaceSelector_jump;
        }
        return HtmlParser::substituteMarkerArray($content, $markers, '###|###');
    }

    public function wrapLoginForm($content) {
        $mainContent = HtmlParser::getSubpart($GLOBALS['TBE_TEMPLATE']->moduleTemplate, '###PAGE###');
        if ($GLOBALS['TBE_STYLES']['logo_login']) {
            $logo = '<img src="' . htmlspecialchars(($GLOBALS['BACK_PATH'] . $GLOBALS['TBE_STYLES']['logo_login'])) . '" alt="" class="t3-login-logo" />';
        } else {
            $logo = '<img' . IconUtility::skinImg($GLOBALS['BACK_PATH'], 'gfx/typo3logo.gif', 'width="123" height="34"') . ' alt="" class="t3-login-logo" />';
        }
        $browserWarning = GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Messaging\\FlashMessage', $GLOBALS['LANG']->getLL('warning.incompatibleBrowser') . ' ' . $GLOBALS['LANG']->getLL('warning.incompatibleBrowserInternetExplorer'), $GLOBALS['LANG']->getLL('warning.incompatibleBrowserHeadline'), FlashMessage::ERROR);
        $browserWarning = $browserWarning->render();
        $additionalCssClasses = array();
        if ($this->isLoginInProgress()) {
            $additionalCssClasses[] = 'error';
        }
        if ($this->loginRefresh) {
            $additionalCssClasses[] = 'refresh';
        }
        $markers = array(
            'LOGO' => $logo,
            'LOGINBOX_IMAGE' => $this->makeLoginBoxImage(),
            'FORM' => $content,
            'NEWS' => $this->makeLoginNews(),
            'COPYRIGHT' => BackendUtility::TYPO3_copyRightNotice($GLOBALS['TYPO3_CONF_VARS']['SYS']['loginCopyrightShowVersion']),
            'CSS_CLASSES' => !empty($additionalCssClasses) ? 'class="' . implode(' ', $additionalCssClasses) . '"' : '',
            'CSS_OPENIDCLASS' => 't3-login-openid-' . (\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::isLoaded('openid') ? 'enabled' : 'disabled'),
            // The labels will be replaced later on, thus the other parts above
            // can use these markers as well and it will be replaced
            'HEADLINE' => $GLOBALS['LANG']->getLL('headline', TRUE),
            'INFO_ABOUT' => $GLOBALS['LANG']->getLL('info.about', TRUE),
            'INFO_RELOAD' => $GLOBALS['LANG']->getLL('info.reset', TRUE),
            'INFO' => $GLOBALS['LANG']->getLL('info.cookies_and_js', TRUE),
            'WARNING_BROWSER_INCOMPATIBLE' => $browserWarning,
            'ERROR_JAVASCRIPT' => $GLOBALS['LANG']->getLL('error.javascript', TRUE),
            'ERROR_COOKIES' => $GLOBALS['LANG']->getLL('error.cookies', TRUE),
            'ERROR_COOKIES_IGNORE' => $GLOBALS['LANG']->getLL('error.cookies_ignore', TRUE),
            'ERROR_CAPSLOCK' => $GLOBALS['LANG']->getLL('error.capslock', TRUE),
            'ERROR_FURTHERHELP' => $GLOBALS['LANG']->getLL('error.furtherInformation', TRUE),
            'LABEL_DONATELINK' => $GLOBALS['LANG']->getLL('labels.donate', TRUE),
            'LABEL_USERNAME' => $GLOBALS['LANG']->getLL('labels.username', TRUE),
            'LABEL_OPENID' => $GLOBALS['LANG']->getLL('labels.openId', TRUE),
            'LABEL_PASSWORD' => $GLOBALS['LANG']->getLL('labels.password', TRUE),
            'LABEL_WHATISOPENID' => $GLOBALS['LANG']->getLL('labels.whatIsOpenId', TRUE),
            'LABEL_SWITCHOPENID' => $GLOBALS['LANG']->getLL('labels.switchToOpenId', TRUE),
            'LABEL_SWITCHDEFAULT' => $GLOBALS['LANG']->getLL('labels.switchToDefault', TRUE),
            'CLEAR' => $GLOBALS['LANG']->getLL('clear', TRUE),
            'LOGIN_PROCESS' => $GLOBALS['LANG']->getLL('login_process', TRUE),
            'SITELINK' => '<a href="/">###SITENAME###</a>',
            // Global variables will now be replaced (at last)
            'SITENAME' => htmlspecialchars($GLOBALS['TYPO3_CONF_VARS']['SYS']['sitename'])
        );
        $markers = $this->emitRenderLoginFormSignal($markers);
        return HtmlParser::substituteMarkerArray($mainContent, $markers, '###|###');
    }

    public function checkRedirect() {
        // Do redirect:
        // If a user is logged in AND a) if either the login is just done (isLoginInProgress) or b) a loginRefresh is done or c) the interface-selector is NOT enabled (If it is on the other hand, it should not just load an interface, because people has to choose then...)
        if (!empty($GLOBALS['BE_USER']->user['uid']) && ($this->isLoginInProgress() || $this->loginRefresh || !$this->interfaceSelector)) {
            // If no cookie has been set previously we tell people that this is a problem. This assumes that a cookie-setting script (like this one) has been hit at least once prior to this instance.
            if (!$_COOKIE[\TYPO3\CMS\Core\Authentication\BackendUserAuthentication::getCookieName()]) {
                if ($this->commandLI == 'setCookie') {
                    // we tried it a second time but still no cookie
                    // 26/4 2005: This does not work anymore, because the saving of challenge values in $_SESSION means the system will act as if the password was wrong.
                    throw new \RuntimeException('Login-error: Yeah, that\'s a classic. No cookies, no TYPO3.<br /><br />Please accept cookies from TYPO3 - otherwise you\'ll not be able to use the system.', 1294586846);
                } else {
                    // try it once again - that might be needed for auto login
                    $this->redirectToURL = 'index.php?commandLI=setCookie';
                }
            }
            if ($redirectToURL = (string) $GLOBALS['BE_USER']->getTSConfigVal('auth.BE.redirectToURL')) {
                $this->redirectToURL = $redirectToURL;
                $this->GPinterface = '';
            }
            // store interface
            $GLOBALS['BE_USER']->uc['interfaceSetup'] = $this->GPinterface;
            $GLOBALS['BE_USER']->writeUC();
            // Based on specific setting of interface we set the redirect script:
            switch ($this->GPinterface) {
                case 'backend':

                case 'backend_old':
                    $this->redirectToURL = 'backend.php';
                    break;
                case 'frontend':
                    $this->redirectToURL = '../';
                    break;
            }
            $formProtection = \TYPO3\CMS\Core\FormProtection\FormProtectionFactory::get();
            // If there is a redirect URL AND if loginRefresh is not set...
            if (!$this->loginRefresh) {
                $formProtection->storeSessionTokenInRegistry();
                HttpUtility::redirect($this->redirectToURL);
            } else {
                $formProtection->setSessionTokenFromRegistry();
                $formProtection->persistSessionToken();
                $GLOBALS['TBE_TEMPLATE']->JScode .= $GLOBALS['TBE_TEMPLATE']->wrapScriptTags('
                    if (parent.opener && (parent.opener.busy || parent.opener.TYPO3.loginRefresh)) {
                        if (parent.opener.TYPO3.loginRefresh) {
                            parent.opener.TYPO3.loginRefresh.startTimer();
                        } else {
                            parent.opener.busy.loginRefreshed();
                        }
                        parent.close();
                    }
                ');
            }
        }
    }

    public function makeInterfaceSelectorBox() {
        // Reset variables:
        $this->interfaceSelector = '';
        $this->interfaceSelector_hidden = '';
        $this->interfaceSelector_jump = '';
        // If interfaces are defined AND no input redirect URL in GET vars:
        if ($GLOBALS['TYPO3_CONF_VARS']['BE']['interfaces'] && ($this->isLoginInProgress() || !$this->redirect_url)) {
            $parts = GeneralUtility::trimExplode(',', $GLOBALS['TYPO3_CONF_VARS']['BE']['interfaces']);
            // Only if more than one interface is defined will we show the selector:
            if (count($parts) > 1) {
                // Initialize:
                $labels = array();
                $labels['backend'] = $GLOBALS['LANG']->getLL('interface.backend');
                $labels['backend_old'] = $GLOBALS['LANG']->getLL('interface.backend_old');
                $labels['frontend'] = $GLOBALS['LANG']->getLL('interface.frontend');
                $jumpScript = array();
                $jumpScript['backend'] = 'backend.php';
                $jumpScript['backend_old'] = 'backend.php';
                $jumpScript['frontend'] = '../';
                // Traverse the interface keys:
                foreach ($parts as $valueStr) {
                    $this->interfaceSelector .= '
                            <option value="' . htmlspecialchars($valueStr) . '"' . (GeneralUtility::_GP('interface') == htmlspecialchars($valueStr) ? ' selected="selected"' : '') . '>' . htmlspecialchars($labels[$valueStr]) . '</option>';
                    $this->interfaceSelector_jump .= '
                            <option value="' . htmlspecialchars($jumpScript[$valueStr]) . '">' . htmlspecialchars($labels[$valueStr]) . '</option>';
                }
                $this->interfaceSelector = '
                        <select id="t3-interfaceselector" name="interface" class="c-interfaceselector" tabindex="3">' . $this->interfaceSelector . '
                        </select>';
                $this->interfaceSelector_jump = '
                        <select id="t3-interfaceselector" name="interface" class="c-interfaceselector" tabindex="3" onchange="window.location.href=this.options[this.selectedIndex].value;">' . $this->interfaceSelector_jump . '
                        </select>';
            } elseif (!$this->redirect_url) {
                // If there is only ONE interface value set and no redirect_url is present:
                $this->interfaceSelector_hidden = '<input type="hidden" name="interface" value="' . trim($GLOBALS['TYPO3_CONF_VARS']['BE']['interfaces']) . '" />';
            }
        }
    }

    public function makeLoginBoxImage() {
        $loginboxImage = '';
        // Look for rotation image folder:
        if ($GLOBALS['TBE_STYLES']['loginBoxImage_rotationFolder']) {
            $absPath = GeneralUtility::resolveBackPath(PATH_typo3 . $GLOBALS['TBE_STYLES']['loginBoxImage_rotationFolder']);
            // Get rotation folder:
            $dir = GeneralUtility::getFileAbsFileName($absPath);
            if ($dir && @is_dir($dir)) {
                // Get files for rotation into array:
                $files = GeneralUtility::getFilesInDir($dir, 'png,jpg,gif');
                // Pick random file:
                $randImg = array_rand($files, 1);
                // Get size of random file:
                $imgSize = @getimagesize(($dir . $files[$randImg]));
                $imgAuthor = is_array($GLOBALS['TBE_STYLES']['loginBoxImage_author']) && $GLOBALS['TBE_STYLES']['loginBoxImage_author'][$files[$randImg]] ? htmlspecialchars($GLOBALS['TBE_STYLES']['loginBoxImage_author'][$files[$randImg]]) : '';
                // Create image tag:
                if (is_array($imgSize)) {
                    $loginboxImage = '<img src="' . htmlspecialchars(($GLOBALS['TBE_STYLES']['loginBoxImage_rotationFolder'] . $files[$randImg])) . '" ' . $imgSize[3] . ' id="loginbox-image" alt="' . $imgAuthor . '" title="' . $imgAuthor . '" />';
                }
            }
        } else {
            // If no rotation folder configured, print default image:
            // Development version
            if (strstr(TYPO3_version, '-dev')) {
                $loginImage = 'loginbox_image_dev.png';
                $imagecopy = 'You are running a development version of TYPO3 ' . TYPO3_branch;
            } else {
                $loginImage = 'loginbox_image.jpg';
                $imagecopy = 'Photo by J.C. Franca (www.digitalphoto.com.br)';
            }
            $loginboxImage = '<img' . IconUtility::skinImg($GLOBALS['BACK_PATH'], ('gfx/' . $loginImage), 'width="200" height="133"') . ' id="loginbox-image" alt="' . $imagecopy . '" title="' . $imagecopy . '" />';
        }
        // Return image tag:
        return $loginboxImage;
    }

    public function makeLoginNews() {
        $newsContent = '';
        $systemNews = $this->getSystemNews();
        // Traverse news array IF there are records in it:
        if (is_array($systemNews) && count($systemNews) && !GeneralUtility::_GP('loginRefresh')) {
            $htmlParser = GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Html\\RteHtmlParser');
            $htmlParser->procOptions['dontHSC_rte'] = TRUE;

            // Get the main news template, and replace the subpart after looped through
            $newsContent = HtmlParser::getSubpart($GLOBALS['TBE_TEMPLATE']->moduleTemplate, '###LOGIN_NEWS###');
            $newsItemTemplate = HtmlParser::getSubpart($newsContent, '###NEWS_ITEM###');
            $newsItem = '';
            $count = 1;
            foreach ($systemNews as $newsItemData) {
                $additionalClass = '';
                if ($count == 1) {
                    $additionalClass = ' first-item';
                } elseif ($count == count($systemNews)) {
                    $additionalClass = ' last-item';
                }
                $newsItemContent = $htmlParser->TS_transform_rte($htmlParser->TS_links_rte($newsItemData['content']));
                $newsItemMarker = array(
                    '###HEADER###' => htmlspecialchars($newsItemData['header']),
                    '###DATE###' => htmlspecialchars($newsItemData['date']),
                    '###CONTENT###' => $newsItemContent,
                    '###CLASS###' => $additionalClass
                );
                $count++;
                $newsItem .= HtmlParser::substituteMarkerArray($newsItemTemplate, $newsItemMarker);
            }
            $title = $GLOBALS['TYPO3_CONF_VARS']['BE']['loginNewsTitle'] ? $GLOBALS['TYPO3_CONF_VARS']['BE']['loginNewsTitle'] : $GLOBALS['LANG']->getLL('newsheadline');
            $newsContent = HtmlParser::substituteMarker($newsContent, '###NEWS_HEADLINE###', htmlspecialchars($title));
            $newsContent = HtmlParser::substituteSubpart($newsContent, '###NEWS_ITEM###', $newsItem);
        }
        return $newsContent;
    }

    protected function getSystemNews() {
        $systemNewsTable = 'sys_news';
        $systemNews = array();
        $systemNewsRecords = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows('title, content, crdate', $systemNewsTable, '1=1' . BackendUtility::BEenableFields($systemNewsTable) . BackendUtility::deleteClause($systemNewsTable), '', 'crdate DESC');
        foreach ($systemNewsRecords as $systemNewsRecord) {
            $systemNews[] = array(
                'date' => date($GLOBALS['TYPO3_CONF_VARS']['SYS']['ddmmyy'], $systemNewsRecord['crdate']),
                'header' => $systemNewsRecord['title'],
                'content' => $systemNewsRecord['content']
            );
        }
        return $systemNews;
    }

    public function startForm() {
        $output = '';
        // The form defaults to 'no login'. This prevents plain
        // text logins to the Backend. The 'sv' extension changes the form to
        // use superchallenged method and rsaauth extension makes rsa authetication.
        $form = '<form action="index.php" method="post" name="loginform" ' . 'onsubmit="alert(\'No authentication methods available. Please, ' . 'contact your TYPO3 administrator.\');return false">';
        // Call hooks. If they do not return anything, we fail to login
        if (is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['typo3/index.php']['loginFormHook'])) {
            foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['typo3/index.php']['loginFormHook'] as $function) {
                $params = array();
                $formCode = GeneralUtility::callUserFunction($function, $params, $this);
                if ($formCode) {
                    $form = $formCode;
                    break;
                }
            }
        }
        $output .= $form . '<input type="hidden" name="login_status" value="login" />' . '<input type="hidden" name="userident" value="" />' . '<input type="hidden" name="redirect_url" value="' . htmlspecialchars($this->redirectToURL) . '" />' . '<input type="hidden" name="loginRefresh" value="' . htmlspecialchars($this->loginRefresh) . '" />' . $this->interfaceSelector_hidden . $this->addFields_hidden;
        return $output;
    }

    public function getJScode() {
        $JSCode = '';
        if (is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['typo3/index.php']['loginScriptHook'])) {
            foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['typo3/index.php']['loginScriptHook'] as $function) {
                $params = array();
                $JSCode = GeneralUtility::callUserFunction($function, $params, $this);
                if ($JSCode) {
                    break;
                }
            }
        }
        $JSCode .= $GLOBALS['TBE_TEMPLATE']->wrapScriptTags('
            function startUp() {
                    // If the login screen is shown in the login_frameset window for re-login, then try to get the username of the current/former login from opening windows main frame:
                try {
                    if (parent.opener && parent.opener.TS && parent.opener.TS.username && document.loginform && document.loginform.username) {
                        document.loginform.username.value = parent.opener.TS.username;
                    }
                }
                catch(error) {
                    //continue
                }

                    // Wait a few millisecons before calling checkFocus(). This might be necessary because some browsers need some time to auto-fill in the form fields
                window.setTimeout("checkFocus()", 50);
            }

                // This moves focus to the right input field:
            function checkFocus() {
                    // If for some reason there already is a username in the username form field, move focus to the password field:
                if (document.loginform.username && document.loginform.username.value == "") {
                    document.loginform.username.focus();
                } else if (document.loginform.p_field && document.loginform.p_field.type!="hidden") {
                    document.loginform.p_field.focus();
                }
            }

                // This function shows a warning, if user has capslock enabled
                // parameter showWarning: shows warning if TRUE and capslock active, otherwise only hides warning, if capslock gets inactive
            function checkCapslock(e, showWarning) {
                if (!isCapslock(e)) {
                    document.getElementById(\'t3-capslock\').style.display = \'none\';
                } else if (showWarning) {
                    document.getElementById(\'t3-capslock\').style.display = \'block\';
                }
            }

                // Checks weather capslock is enabled (returns TRUE if enabled, false otherwise)
                // thanks to http://24ways.org/2007/capturing-caps-lock

            function isCapslock(e) {
                var ev = e ? e : window.event;
                if (!ev) {
                    return;
                }
                var targ = ev.target ? ev.target : ev.srcElement;
                // get key pressed
                var which = -1;
                if (ev.which) {
                    which = ev.which;
                } else if (ev.keyCode) {
                    which = ev.keyCode;
                }
                // get shift status
                var shift_status = false;
                if (ev.shiftKey) {
                    shift_status = ev.shiftKey;
                } else if (ev.modifiers) {
                    shift_status = !!(ev.modifiers & 4);
                }
                return (((which >= 65 && which <= 90) && !shift_status) ||
                    ((which >= 97 && which <= 122) && shift_status));
            }

                // prevent opening the login form in the backend frameset
            if (top.location.href != self.location.href) {
                top.location.href = self.location.href;
            }

            ');
        return $JSCode;
    }

    protected function isLoginInProgress() {
        $username = GeneralUtility::_GP('username');
        return !(empty($username) && empty($this->commandLI));
    }

    protected function emitRenderLoginFormSignal(array $markers) {
        $signalArguments = $this->getSignalSlotDispatcher()->dispatch('TYPO3\\CMS\\Backend\\Controller\\LoginController', self::SIGNAL_RenderLoginForm, array($this, $markers));
        return $signalArguments[1];
    }

    protected function getSignalSlotDispatcher() {
        if (!isset($this->signalSlotDispatcher)) {
            $this->signalSlotDispatcher = $this->getObjectManager()->get('TYPO3\\CMS\\Extbase\\SignalSlot\\Dispatcher');
        }
        return $this->signalSlotDispatcher;
    }

    protected function getObjectManager() {
        return GeneralUtility::makeInstance('TYPO3\\CMS\\Extbase\\Object\\ObjectManager');
    }

}