TYPO3\CMS\Core\Authentication\BackendUserAuthentication

Complexity

Total Complexity

360

Size/Duplication

Total Lines	2461
Duplicated Lines	0 %

Importance

Changes	2
Bugs	0	Features	0

60 Methods

Rating	Name	Duplication	Size	Complexity
A	isMemberOfGroup()	0	7	3
A	doesUserHaveAccess()	0	4	1
A	getTSConfig()	0	3	1
A	initializeWebmountsForElementBrowser()	0	14	3
A	setWebmounts()	0	10	3
A	jsConfirmation()	0	10	3
A	returnWebmounts()	0	3	2
A	setWorkspace()	0	17	3
A	setCachedList()	0	7	2
A	initializeFileStorages()	0	26	6
A	getCategoryMountPoints()	0	24	5
A	getFileStorages()	0	7	2
A	evaluateUserSpecificFileFilterSettings()	0	5	2
A	workspaceInit()	0	9	2
A	prepareUserTsConfig()	0	35	4
A	getFilePermissionsForStorage()	0	15	3
C	fetchGroups()	0	82	13
A	getFilePermissions()	0	47	4
F	getFileMountRecords()	0	140	21
F	getDefaultUploadFolder()	0	58	16
A	getDefaultUploadTemporaryFolder()	0	19	4
C	calcPerms()	0	34	12
A	setTemporaryWorkspace()	0	12	2
A	mayMakeShortcut()	0	4	2
A	getDefaultWorkspace()	0	25	5
A	overrideUC()	0	3	1
B	initializeDbMountpointsInWorkspace()	0	46	9
A	workspaceCanCreateNewRecord()	0	7	3
A	check()	0	4	3
A	logoff()	0	17	5
A	__construct()	0	4	1
C	checkWorkspace()	0	61	14
A	getOriginalUserIdWhenInSwitchUserMode()	0	4	2
B	checkFullLanguagesAccess()	0	32	6
A	getPagePermsClause()	0	58	5
A	workspaceAllowsLiveEditingInTable()	0	17	5
A	isRTE()	0	3	1
B	workspaceCannotEditRecord()	0	41	11
A	workspacePublishAccess()	0	22	6
A	checkLanguageAccess()	0	11	4
D	isInWebMount()	0	54	15
A	filterValidWebMounts()	0	33	5
B	writelog()	0	53	5
A	setDefaultWorkspace()	0	4	1
C	modAccess()	0	31	15
A	workspaceCannotEditOfflineVersion()	0	16	6
B	fetchGroupData()	0	62	6
B	backendCheckLogin()	0	33	7
A	isAdmin()	0	3	2
D	recordEditAccessInternals()	0	91	28
D	workspaceCheckStageForCurrent()	0	49	19
A	workspaceAllowAutoCreation()	0	18	5
A	isUserAllowedToLogin()	0	22	4
A	releaseLockedRecords()	0	8	2
B	backendSetUC()	0	40	8
B	isSystemMaintainer()	0	25	7
D	checkAuthMode()	0	62	20
A	checkWorkspaceCurrent()	0	6	2
A	getCookieName()	0	7	2
A	resetUC()	0	5	1

<?php

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

namespace TYPO3\CMS\Core\Authentication;

use TYPO3\CMS\Backend\Configuration\TypoScript\ConditionMatching\ConditionMatcher;
use TYPO3\CMS\Backend\Utility\BackendUtility;
use TYPO3\CMS\Core\Cache\CacheManager;
use TYPO3\CMS\Core\Core\Environment;
use TYPO3\CMS\Core\Database\Connection;
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Database\Query\Expression\ExpressionBuilder;
use TYPO3\CMS\Core\Database\Query\QueryHelper;
use TYPO3\CMS\Core\Database\Query\Restriction\DeletedRestriction;
use TYPO3\CMS\Core\Database\Query\Restriction\HiddenRestriction;
use TYPO3\CMS\Core\Database\Query\Restriction\RootLevelRestriction;
use TYPO3\CMS\Core\Database\Query\Restriction\WorkspaceRestriction;
use TYPO3\CMS\Core\FormProtection\FormProtectionFactory;
use TYPO3\CMS\Core\Http\ImmediateResponseException;
use TYPO3\CMS\Core\Http\RedirectResponse;
use TYPO3\CMS\Core\Resource\Exception;
use TYPO3\CMS\Core\Resource\Filter\FileNameFilter;
use TYPO3\CMS\Core\Resource\Folder;
use TYPO3\CMS\Core\Resource\ResourceFactory;
use TYPO3\CMS\Core\Resource\ResourceStorage;
use TYPO3\CMS\Core\Resource\StorageRepository;
use TYPO3\CMS\Core\SysLog\Action as SystemLogGenericAction;
use TYPO3\CMS\Core\SysLog\Error as SystemLogErrorClassification;
use TYPO3\CMS\Core\SysLog\Type as SystemLogType;
use TYPO3\CMS\Core\Type\Bitmask\BackendGroupMountOption;
use TYPO3\CMS\Core\Type\Bitmask\JsConfirmation;
use TYPO3\CMS\Core\Type\Bitmask\Permission;
use TYPO3\CMS\Core\Type\Exception\InvalidEnumerationValueException;
use TYPO3\CMS\Core\TypoScript\Parser\TypoScriptParser;
use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Utility\StringUtility;
use TYPO3\CMS\Core\Versioning\VersionState;
use TYPO3\CMS\Install\Service\SessionService;

/**
 * TYPO3 backend user authentication
 * Contains most of the functions used for checking permissions, authenticating users,
 * setting up the user, and API for user from outside.
 * This class contains the configuration of the database fields used plus some
 * functions for the authentication process of backend users.
 */
class BackendUserAuthentication extends AbstractUserAuthentication
{
    public const ROLE_SYSTEMMAINTAINER = 'systemMaintainer';

    /**
     * Should be set to the usergroup-column (id-list) in the user-record
     * @var string
     */
    public $usergroup_column = 'usergroup';

    /**
     * The name of the group-table
     * @var string
     */
    public $usergroup_table = 'be_groups';

    /**
     * holds lists of eg. tables, fields and other values related to the permission-system. See fetchGroupData
     * @var array
     * @internal
     */
    public $groupData = [
        'filemounts' => []
    ];

    /**
     * This array will hold the groups that the user is a member of
     * @var array
     */
    public $userGroups = [];

    /**
     * This array holds the uid's of the groups in the listed order
     * @var array
     */
    public $userGroupsUID = [];

    /**
     * This is $this->userGroupsUID imploded to a comma list... Will correspond to the 'usergroup_cached_list'
     * @var string
     */
    public $groupList = '';

    /**
     * User workspace.
     * -99 is ERROR (none available)
     * 0 is online
     * >0 is custom workspaces
     * @var int
     */
    public $workspace = -99;

    /**
     * Custom workspace record if any
     * @var array
     */
    public $workspaceRec = [];

    /**
     * Used to accumulate data for the user-group.
     * DON NOT USE THIS EXTERNALLY!
     * Use $this->groupData instead
     * @var array
     * @internal
     */
    public $dataLists = [
        'webmount_list' => '',
        'filemount_list' => '',
        'file_permissions' => '',
        'modList' => '',
        'tables_select' => '',
        'tables_modify' => '',
        'pagetypes_select' => '',
        'non_exclude_fields' => '',
        'explicit_allowdeny' => '',
        'allowed_languages' => '',
        'workspace_perms' => '',
        'available_widgets' => '',
        'custom_options' => ''
    ];

    /**
     * List of group_id's in the order they are processed.
     * @var array
     * @internal should only be used from within TYPO3 Core
     */
    public $includeGroupArray = [];

    /**
     * @var array Parsed user TSconfig
     */
    protected $userTS = [];

    /**
     * @var bool True if the user TSconfig was parsed and needs to be cached.
     */
    protected $userTSUpdated = false;

    /**
     * Contains last error message
     * @internal should only be used from within TYPO3 Core
     * @var string
     */
    public $errorMsg = '';

    /**
     * Cache for checkWorkspaceCurrent()
     * @var array|null
     */
    protected $checkWorkspaceCurrent_cache;

    /**
     * @var \TYPO3\CMS\Core\Resource\ResourceStorage[]
     */
    protected $fileStorages;

    /**
     * @var array
     */
    protected $filePermissions;

    /**
     * Table in database with user data
     * @var string
     */
    public $user_table = 'be_users';

    /**
     * Column for login-name
     * @var string
     */
    public $username_column = 'username';

    /**
     * Column for password
     * @var string
     */
    public $userident_column = 'password';

    /**
     * Column for user-id
     * @var string
     */
    public $userid_column = 'uid';

    /**
     * @var string
     */
    public $lastLogin_column = 'lastlogin';

    /**
     * @var array
     */
    public $enablecolumns = [
        'rootLevel' => 1,
        'deleted' => 'deleted',
        'disabled' => 'disable',
        'starttime' => 'starttime',
        'endtime' => 'endtime'
    ];

    /**
     * Form field with login-name
     * @var string
     */
    public $formfield_uname = 'username';

    /**
     * Form field with password
     * @var string
     */
    public $formfield_uident = 'userident';

    /**
     * Form field with status: *'login', 'logout'
     * @var string
     */
    public $formfield_status = 'login_status';

    /**
     * Decides if the writelog() function is called at login and logout
     * @var bool
     */
    public $writeStdLog = true;

    /**
     * If the writelog() functions is called if a login-attempt has be tried without success
     * @var bool
     */
    public $writeAttemptLog = true;

    /**
     * @var int
     * @internal should only be used from within TYPO3 Core
     */
    public $firstMainGroup = 0;

    /**
     * User Config
     * @var array
     */
    public $uc;

    /**
     * User Config Default values:
     * The array may contain other fields for configuration.
     * For this, see "setup" extension and "TSconfig" document (User TSconfig, "setup.[xxx]....")
     * Reserved keys for other storage of session data:
     * moduleData
     * moduleSessionID
     * @var array
     * @internal should only be used from within TYPO3 Core
     */
    public $uc_default = [
        'interfaceSetup' => '',
        // serialized content that is used to store interface pane and menu positions. Set by the logout.php-script
        'moduleData' => [],
        // user-data for the modules
        'emailMeAtLogin' => 0,
        'titleLen' => 50,
        'edit_RTE' => '1',
        'edit_docModuleUpload' => '1',
        'resizeTextareas_MaxHeight' => 500,
    ];

    /**
     * Login type, used for services.
     * @var string
     */
    public $loginType = 'BE';

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->name = self::getCookieName();
        parent::__construct();
    }

    /**
     * Returns TRUE if user is admin
     * Basically this function evaluates if the ->user[admin] field has bit 0 set. If so, user is admin.
     *
     * @return bool
     */
    public function isAdmin()
    {
        return is_array($this->user) && ($this->user['admin'] & 1) == 1;
    }

    /**
     * Returns TRUE if the current user is a member of group $groupId
     * $groupId must be set. $this->groupList must contain groups
     * Will return TRUE also if the user is a member of a group through subgroups.
     *
     * @param int $groupId Group ID to look for in $this->groupList
     * @return bool
     * @internal should only be used from within TYPO3 Core, use Context API for quicker access
     */
    public function isMemberOfGroup($groupId)
    {
        $groupId = (int)$groupId;
        if ($this->groupList && $groupId) {
            return GeneralUtility::inList($this->groupList, (string)$groupId);
        }
        return false;
    }

    /**
     * Checks if the permissions is granted based on a page-record ($row) and $perms (binary and'ed)
     *
     * Bits for permissions, see $perms variable:
     *
     * 1  - Show:             See/Copy page and the pagecontent.
     * 2  - Edit page:        Change/Move the page, eg. change title, startdate, hidden.
     * 4  - Delete page:      Delete the page and pagecontent.
     * 8  - New pages:        Create new pages under the page.
     * 16 - Edit pagecontent: Change/Add/Delete/Move pagecontent.
     *
     * @param array $row Is the pagerow for which the permissions is checked
     * @param int $perms Is the binary representation of the permission we are going to check. Every bit in this number represents a permission that must be set. See function explanation.
     * @return bool
     */
    public function doesUserHaveAccess($row, $perms)
    {
        $userPerms = $this->calcPerms($row);
        return ($userPerms & $perms) == $perms;
    }

    /**
     * Checks if the page id or page record ($idOrRow) is found within the webmounts set up for the user.
     * This should ALWAYS be checked for any page id a user works with, whether it's about reading, writing or whatever.
     * The point is that this will add the security that a user can NEVER touch parts outside his mounted
     * pages in the page tree. This is otherwise possible if the raw page permissions allows for it.
     * So this security check just makes it easier to make safe user configurations.
     * If the user is admin then it returns "1" right away
     * Otherwise the function will return the uid of the webmount which was first found in the rootline of the input page $id
     *
     * @param int|array $idOrRow Page ID or full page record to check
     * @param string $readPerms Content of "->getPagePermsClause(1)" (read-permissions). If not set, they will be internally calculated (but if you have the correct value right away you can save that database lookup!)
     * @param bool|int $exitOnError If set, then the function will exit with an error message.
     * @throws \RuntimeException
     * @return int|null The page UID of a page in the rootline that matched a mount point
     */
    public function isInWebMount($idOrRow, $readPerms = '', $exitOnError = 0)
    {
        if ($this->isAdmin()) {
            return 1;
        }
        $checkRec = [];
        $fetchPageFromDatabase = true;
        if (is_array($idOrRow)) {
            if (empty($idOrRow['uid'])) {
                throw new \RuntimeException('The given page record is invalid. Missing uid.', 1578950324);
            }
            $checkRec = $idOrRow;
            $id = (int)$idOrRow['uid'];
            // ensure the required fields are present on the record
            if (isset($checkRec['t3ver_oid'], $checkRec[$GLOBALS['TCA']['pages']['ctrl']['languageField']], $checkRec[$GLOBALS['TCA']['pages']['ctrl']['transOrigPointerField']])) {
                $fetchPageFromDatabase = false;
            }
        } else {
            $id = (int)$idOrRow;
        }
        if ($fetchPageFromDatabase) {
            // Check if input id is an offline version page in which case we will map id to the online version:
            $checkRec = BackendUtility::getRecord(
                'pages',
                $id,
                't3ver_oid,'
                . $GLOBALS['TCA']['pages']['ctrl']['transOrigPointerField'] . ','
                . $GLOBALS['TCA']['pages']['ctrl']['languageField']
            );
        }
        if ($checkRec['t3ver_oid'] > 0) {
            $id = (int)$checkRec['t3ver_oid'];
        }
        // if current rec is a translation then get uid from l10n_parent instead
        // because web mounts point to pages in default language and rootline returns uids of default languages
        if ((int)$checkRec[$GLOBALS['TCA']['pages']['ctrl']['languageField']] !== 0 && (int)$checkRec[$GLOBALS['TCA']['pages']['ctrl']['transOrigPointerField']] !== 0) {
            $id = (int)$checkRec[$GLOBALS['TCA']['pages']['ctrl']['transOrigPointerField']];
        }
        if (!$readPerms) {
            $readPerms = $this->getPagePermsClause(Permission::PAGE_SHOW);
        }
        if ($id > 0) {
            $wM = $this->returnWebmounts();
            $rL = BackendUtility::BEgetRootLine($id, ' AND ' . $readPerms, true);
            foreach ($rL as $v) {
                if ($v['uid'] && in_array($v['uid'], $wM)) {
                    return $v['uid'];
                }
            }
        }
        if ($exitOnError) {
            throw new \RuntimeException('Access Error: This page is not within your DB-mounts', 1294586445);
        }
        return null;
    }

    /**
     * Checks access to a backend module with the $MCONF passed as first argument
     *
     * @param array $conf $MCONF array of a backend module!
     * @throws \RuntimeException
     * @return bool Will return TRUE if $MCONF['access'] is not set at all, if the BE_USER is admin or if the module is enabled in the be_users/be_groups records of the user (specifically enabled). Will return FALSE if the module name is not even found in $TBE_MODULES
     */
    public function modAccess($conf)
    {
        if (!BackendUtility::isModuleSetInTBE_MODULES($conf['name'])) {
            throw new \RuntimeException('Fatal Error: This module "' . $conf['name'] . '" is not enabled in TBE_MODULES', 1294586446);
        }
        // Workspaces check:
        if (
            !empty($conf['workspaces'])
            && ExtensionManagementUtility::isLoaded('workspaces')
            && ($this->workspace !== 0 || !GeneralUtility::inList($conf['workspaces'], 'online'))
            && ($this->workspace <= 0 || !GeneralUtility::inList($conf['workspaces'], 'custom'))
        ) {
            throw new \RuntimeException('Workspace Error: This module "' . $conf['name'] . '" is not available under the current workspace', 1294586447);
        }
        // Returns false if conf[access] is set to system maintainers and the user is system maintainer
        if (strpos($conf['access'], self::ROLE_SYSTEMMAINTAINER) !== false && !$this->isSystemMaintainer()) {
            throw new \RuntimeException('This module "' . $conf['name'] . '" is only available as system maintainer', 1504804727);
        }
        // Returns TRUE if conf[access] is not set at all or if the user is admin
        if (!$conf['access'] || $this->isAdmin()) {
            return true;
        }
        // If $conf['access'] is set but not with 'admin' then we return TRUE, if the module is found in the modList
        $acs = false;
        if (strpos($conf['access'], 'admin') === false && $conf['name']) {
            $acs = $this->check('modules', $conf['name']);
        }
        if (!$acs) {
            throw new \RuntimeException('Access Error: You don\'t have access to this module.', 1294586448);
        }
        return $acs;
    }

    /**
     * Checks if the user is in the valid list of allowed system maintainers. if the list is not set,
     * then all admins are system maintainers. If the list is empty, no one is system maintainer (good for production
     * systems). If the currently logged in user is in "switch user" mode, this method will return false.
     *
     * @return bool
     */
    public function isSystemMaintainer(): bool
    {
        if (!$this->isAdmin()) {
            return false;
        }

        if ($GLOBALS['BE_USER']->getOriginalUserIdWhenInSwitchUserMode()) {
            return false;
        }
        if (Environment::getContext()->isDevelopment()) {
            return true;
        }
        $systemMaintainers = $GLOBALS['TYPO3_CONF_VARS']['SYS']['systemMaintainers'] ?? [];
        $systemMaintainers = array_map('intval', $systemMaintainers);
        if (!empty($systemMaintainers)) {
            return in_array((int)$this->user['uid'], $systemMaintainers, true);
        }
        // No system maintainers set up yet, so any admin is allowed to access the modules
        // but explicitly no system maintainers allowed (empty string in TYPO3_CONF_VARS).
        // @todo: this needs to be adjusted once system maintainers can log into the install tool with their credentials
        if (isset($GLOBALS['TYPO3_CONF_VARS']['SYS']['systemMaintainers'])
            && empty($GLOBALS['TYPO3_CONF_VARS']['SYS']['systemMaintainers'])) {
            return false;
        }
        return true;
    }

    /**
     * Returns a WHERE-clause for the pages-table where user permissions according to input argument, $perms, is validated.
     * $perms is the "mask" used to select. Fx. if $perms is 1 then you'll get all pages that a user can actually see!
     * 2^0 = show (1)
     * 2^1 = edit (2)
     * 2^2 = delete (4)
     * 2^3 = new (8)
     * If the user is 'admin' " 1=1" is returned (no effect)
     * If the user is not set at all (->user is not an array), then " 1=0" is returned (will cause no selection results at all)
     * The 95% use of this function is "->getPagePermsClause(1)" which will
     * return WHERE clauses for *selecting* pages in backend listings - in other words this will check read permissions.
     *
     * @param int $perms Permission mask to use, see function description
     * @return string Part of where clause. Prefix " AND " to this.
     * @internal should only be used from within TYPO3 Core, use PagePermissionDatabaseRestriction instead.
     */
    public function getPagePermsClause($perms)
    {
        if (is_array($this->user)) {
            if ($this->isAdmin()) {
                return ' 1=1';
            }
            // Make sure it's integer.
            $perms = (int)$perms;
            $expressionBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
                ->getQueryBuilderForTable('pages')
                ->expr();

            // User
            $constraint = $expressionBuilder->orX(
                $expressionBuilder->comparison(
                    $expressionBuilder->bitAnd('pages.perms_everybody', $perms),
                    ExpressionBuilder::EQ,
                    $perms
                ),
                $expressionBuilder->andX(
                    $expressionBuilder->eq('pages.perms_userid', (int)$this->user['uid']),
                    $expressionBuilder->comparison(
                        $expressionBuilder->bitAnd('pages.perms_user', $perms),
                        ExpressionBuilder::EQ,
                        $perms
                    )
                )
            );

            // Group (if any is set)
            if ($this->groupList) {
                $constraint->add(
                    $expressionBuilder->andX(
                        $expressionBuilder->in(
                            'pages.perms_groupid',
                            GeneralUtility::intExplode(',', $this->groupList)
                        ),
                        $expressionBuilder->comparison(
                            $expressionBuilder->bitAnd('pages.perms_group', $perms),
                            ExpressionBuilder::EQ,
                            $perms
                        )
                    )
                );
            }

            $constraint = ' (' . (string)$constraint . ')';

            // ****************
            // getPagePermsClause-HOOK
            // ****************
            foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_userauthgroup.php']['getPagePermsClause'] ?? [] as $_funcRef) {
                $_params = ['currentClause' => $constraint, 'perms' => $perms];
                $constraint = GeneralUtility::callUserFunction($_funcRef, $_params, $this);
            }
            return $constraint;
        }
        return ' 1=0';
    }

    /**
     * Returns a combined binary representation of the current users permissions for the page-record, $row.
     * The perms for user, group and everybody is OR'ed together (provided that the page-owner is the user
     * and for the groups that the user is a member of the group.
     * If the user is admin, 31 is returned	(full permissions for all five flags)
     *
     * @param array $row Input page row with all perms_* fields available.
     * @return int Bitwise representation of the users permissions in relation to input page row, $row
     */
    public function calcPerms($row)
    {
        // Return 31 for admin users.
        if ($this->isAdmin()) {
            return Permission::ALL;
        }
        // Return 0 if page is not within the allowed web mount
        if (!$this->isInWebMount($row)) {

The expression $this->isInWebMount($row) of type integer|null is loosely compared to false; this is ambiguous if the integer can be 0. You might want to explicitly use === null instead.

            return Permission::NOTHING;
        }
        $out = Permission::NOTHING;
        if (
            isset($row['perms_userid']) && isset($row['perms_user']) && isset($row['perms_groupid'])
            && isset($row['perms_group']) && isset($row['perms_everybody']) && isset($this->groupList)
        ) {
            if ($this->user['uid'] == $row['perms_userid']) {
                $out |= $row['perms_user'];
            }
            if ($this->isMemberOfGroup($row['perms_groupid'])) {
                $out |= $row['perms_group'];
            }
            $out |= $row['perms_everybody'];
        }
        // ****************
        // CALCPERMS hook
        // ****************
        foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_userauthgroup.php']['calcPerms'] ?? [] as $_funcRef) {
            $_params = [
                'row' => $row,
                'outputPermissions' => $out
            ];
            $out = GeneralUtility::callUserFunction($_funcRef, $_params, $this);
        }
        return $out;
    }

    /**
     * Returns TRUE if the RTE (Rich Text Editor) is enabled for the user.
     *
     * @return bool
     * @internal should only be used from within TYPO3 Core
     */
    public function isRTE()
    {
        return (bool)$this->uc['edit_RTE'];
    }

    /**
     * Returns TRUE if the $value is found in the list in a $this->groupData[] index pointed to by $type (array key).
     * Can thus be users to check for modules, exclude-fields, select/modify permissions for tables etc.
     * If user is admin TRUE is also returned
     * Please see the document Inside TYPO3 for examples.
     *
     * @param string $type The type value; "webmounts", "filemounts", "pagetypes_select", "tables_select", "tables_modify", "non_exclude_fields", "modules", "available_widgets"
     * @param string $value String to search for in the groupData-list
     * @return bool TRUE if permission is granted (that is, the value was found in the groupData list - or the BE_USER is "admin")
     */
    public function check($type, $value)
    {
        return isset($this->groupData[$type])
            && ($this->isAdmin() || GeneralUtility::inList($this->groupData[$type], $value));
    }

    /**
     * Checking the authMode of a select field with authMode set
     *
     * @param string $table Table name
     * @param string $field Field name (must be configured in TCA and of type "select" with authMode set!)
     * @param string $value Value to evaluation (single value, must not contain any of the chars ":,|")
     * @param string $authMode Auth mode keyword (explicitAllow, explicitDeny, individual)
     * @return bool Whether access is granted or not
     */
    public function checkAuthMode($table, $field, $value, $authMode)
    {
        // Admin users can do anything:
        if ($this->isAdmin()) {
            return true;
        }
        // Allow all blank values:
        if ((string)$value === '') {
            return true;
        }
        // Allow dividers:
        if ($value === '--div--') {
            return true;
        }
        // Certain characters are not allowed in the value
        if (preg_match('/[:|,]/', $value)) {
            return false;
        }
        // Initialize:
        $testValue = $table . ':' . $field . ':' . $value;
        $out = true;
        // Checking value:
        switch ((string)$authMode) {
            case 'explicitAllow':
                if (!GeneralUtility::inList($this->groupData['explicit_allowdeny'], $testValue . ':ALLOW')) {
                    $out = false;
                }
                break;
            case 'explicitDeny':
                if (GeneralUtility::inList($this->groupData['explicit_allowdeny'], $testValue . ':DENY')) {
                    $out = false;
                }
                break;
            case 'individual':
                if (is_array($GLOBALS['TCA'][$table]) && is_array($GLOBALS['TCA'][$table]['columns'][$field])) {
                    $items = $GLOBALS['TCA'][$table]['columns'][$field]['config']['items'];
                    if (is_array($items)) {
                        foreach ($items as $iCfg) {
                            if ((string)$iCfg[1] === (string)$value && $iCfg[4]) {
                                switch ((string)$iCfg[4]) {
                                    case 'EXPL_ALLOW':
                                        if (!GeneralUtility::inList(
                                            $this->groupData['explicit_allowdeny'],
                                            $testValue . ':ALLOW'
                                        )) {
                                            $out = false;
                                        }
                                        break;
                                    case 'EXPL_DENY':
                                        if (GeneralUtility::inList($this->groupData['explicit_allowdeny'], $testValue . ':DENY')) {
                                            $out = false;
                                        }
                                        break;
                                }
                                break;
                            }
                        }
                    }
                }
                break;
        }
        return $out;
    }

    /**
     * Checking if a language value (-1, 0 and >0 for sys_language records) is allowed to be edited by the user.
     *
     * @param int $langValue Language value to evaluate
     * @return bool Returns TRUE if the language value is allowed, otherwise FALSE.
     */
    public function checkLanguageAccess($langValue)
    {
        // The users language list must be non-blank - otherwise all languages are allowed.
        if (trim($this->groupData['allowed_languages']) !== '') {
            $langValue = (int)$langValue;
            // Language must either be explicitly allowed OR the lang Value be "-1" (all languages)
            if ($langValue != -1 && !$this->check('allowed_languages', (string)$langValue)) {
                return false;
            }
        }
        return true;
    }

    /**
     * Check if user has access to all existing localizations for a certain record
     *
     * @param string $table The table
     * @param array $record The current record
     * @return bool
     */
    public function checkFullLanguagesAccess($table, $record)
    {
        if (!$this->checkLanguageAccess(0)) {
            return false;
        }

        if (BackendUtility::isTableLocalizable($table)) {
            $pointerField = $GLOBALS['TCA'][$table]['ctrl']['transOrigPointerField'];
            $pointerValue = $record[$pointerField] > 0 ? $record[$pointerField] : $record['uid'];
            $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable($table);
            $queryBuilder->getRestrictions()
                ->removeAll()
                ->add(GeneralUtility::makeInstance(DeletedRestriction::class))
                ->add(GeneralUtility::makeInstance(WorkspaceRestriction::class, (int)$this->workspace));
            $recordLocalizations = $queryBuilder->select('*')
                ->from($table)
                ->where(
                    $queryBuilder->expr()->eq(
                        $pointerField,
                        $queryBuilder->createNamedParameter($pointerValue, \PDO::PARAM_INT)
                    )
                )
                ->execute()
                ->fetchAll();

            foreach ($recordLocalizations as $recordLocalization) {
                if (!$this->checkLanguageAccess($recordLocalization[$GLOBALS['TCA'][$table]['ctrl']['languageField']])) {
                    return false;
                }
            }
        }
        return true;
    }

    /**
     * Checking if a user has editing access to a record from a $GLOBALS['TCA'] table.
     * The checks does not take page permissions and other "environmental" things into account.
     * It only deal with record internals; If any values in the record fields disallows it.
     * For instance languages settings, authMode selector boxes are evaluated (and maybe more in the future).
     * It will check for workspace dependent access.
     * The function takes an ID (int) or row (array) as second argument.
     *
     * @param string $table Table name
     * @param int|array $idOrRow If integer, then this is the ID of the record. If Array this just represents fields in the record.
     * @param bool $newRecord Set, if testing a new (non-existing) record array. Will disable certain checks that doesn't make much sense in that context.
     * @param bool $deletedRecord Set, if testing a deleted record array.
     * @param bool $checkFullLanguageAccess Set, whenever access to all translations of the record is required
     * @return bool TRUE if OK, otherwise FALSE
     * @internal should only be used from within TYPO3 Core
     */
    public function recordEditAccessInternals($table, $idOrRow, $newRecord = false, $deletedRecord = false, $checkFullLanguageAccess = false)
    {
        if (!isset($GLOBALS['TCA'][$table])) {
            return false;
        }
        // Always return TRUE for Admin users.
        if ($this->isAdmin()) {
            return true;
        }
        // Fetching the record if the $idOrRow variable was not an array on input:
        if (!is_array($idOrRow)) {
            if ($deletedRecord) {
                $idOrRow = BackendUtility::getRecord($table, $idOrRow, '*', '', false);
            } else {
                $idOrRow = BackendUtility::getRecord($table, $idOrRow);
            }
            if (!is_array($idOrRow)) {
                $this->errorMsg = 'ERROR: Record could not be fetched.';
                return false;
            }
        }
        // Checking languages:
        if ($table === 'pages' && $checkFullLanguageAccess && !$this->checkFullLanguagesAccess($table, $idOrRow)) {
            return false;
        }
        if ($GLOBALS['TCA'][$table]['ctrl']['languageField']) {
            // Language field must be found in input row - otherwise it does not make sense.
            if (isset($idOrRow[$GLOBALS['TCA'][$table]['ctrl']['languageField']])) {
                if (!$this->checkLanguageAccess($idOrRow[$GLOBALS['TCA'][$table]['ctrl']['languageField']])) {
                    $this->errorMsg = 'ERROR: Language was not allowed.';
                    return false;
                }
                if (
                    $checkFullLanguageAccess && $idOrRow[$GLOBALS['TCA'][$table]['ctrl']['languageField']] == 0
                    && !$this->checkFullLanguagesAccess($table, $idOrRow)
                ) {
                    $this->errorMsg = 'ERROR: Related/affected language was not allowed.';
                    return false;
                }
            } else {
                $this->errorMsg = 'ERROR: The "languageField" field named "'
                    . $GLOBALS['TCA'][$table]['ctrl']['languageField'] . '" was not found in testing record!';
                return false;
            }
        }
        // Checking authMode fields:
        if (is_array($GLOBALS['TCA'][$table]['columns'])) {
            foreach ($GLOBALS['TCA'][$table]['columns'] as $fieldName => $fieldValue) {
                if (isset($idOrRow[$fieldName])) {
                    if (
                        $fieldValue['config']['type'] === 'select' && $fieldValue['config']['authMode']
                        && $fieldValue['config']['authMode_enforce'] === 'strict'
                    ) {
                        if (!$this->checkAuthMode($table, $fieldName, $idOrRow[$fieldName], $fieldValue['config']['authMode'])) {
                            $this->errorMsg = 'ERROR: authMode "' . $fieldValue['config']['authMode']
                                . '" failed for field "' . $fieldName . '" with value "'
                                . $idOrRow[$fieldName] . '" evaluated';
                            return false;
                        }
                    }
                }
            }
        }
        // Checking "editlock" feature (doesn't apply to new records)
        if (!$newRecord && $GLOBALS['TCA'][$table]['ctrl']['editlock']) {
            if (isset($idOrRow[$GLOBALS['TCA'][$table]['ctrl']['editlock']])) {
                if ($idOrRow[$GLOBALS['TCA'][$table]['ctrl']['editlock']]) {
                    $this->errorMsg = 'ERROR: Record was locked for editing. Only admin users can change this state.';
                    return false;
                }
            } else {
                $this->errorMsg = 'ERROR: The "editLock" field named "' . $GLOBALS['TCA'][$table]['ctrl']['editlock']
                    . '" was not found in testing record!';
                return false;
            }
        }
        // Checking record permissions
        // THIS is where we can include a check for "perms_" fields for other records than pages...
        // Process any hooks
        foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_userauthgroup.php']['recordEditAccessInternals'] ?? [] as $funcRef) {
            $params = [
                'table' => $table,
                'idOrRow' => $idOrRow,
                'newRecord' => $newRecord
            ];
            if (!GeneralUtility::callUserFunction($funcRef, $params, $this)) {
                return false;
            }
        }
        // Finally, return TRUE if all is well.
        return true;
    }

    /**
     * Returns TRUE if the BE_USER is allowed to *create* shortcuts in the backend modules
     *
     * @return bool
     */
    public function mayMakeShortcut()
    {
        return ($this->getTSConfig()['options.']['enableBookmarks'] ?? false)
            && !($this->getTSConfig()['options.']['mayNotCreateEditBookmarks'] ?? false);
    }

    /**
     * Checking if editing of an existing record is allowed in current workspace if that is offline.
     * Rules for editing in offline mode:
     * - record supports versioning and is an offline version from workspace and has the current stage
     * - or record (any) is in a branch where there is a page which is a version from the workspace
     *   and where the stage is not preventing records
     *
     * @param string $table Table of record
     * @param array|int $recData Integer (record uid) or array where fields are at least: pid, t3ver_wsid, t3ver_oid, t3ver_stage (if versioningWS is set)
     * @return string String error code, telling the failure state. FALSE=All ok
     * @internal should only be used from within TYPO3 Core
     */
    public function workspaceCannotEditRecord($table, $recData)
    {
        // Only test if the user is in a workspace
        if ($this->workspace === 0) {
            return false;

The expression return false returns the type false which is incompatible with the documented return type string.

        }
        $tableSupportsVersioning = BackendUtility::isTableWorkspaceEnabled($table);
        if (!is_array($recData)) {
            $recData = BackendUtility::getRecord(
                $table,
                $recData,
                'pid' . ($tableSupportsVersioning ? ',t3ver_oid,t3ver_wsid,t3ver_state,t3ver_stage' : '')
            );
        }
        if (is_array($recData)) {
            // We are testing a "version" (identified by having a t3ver_oid): it can be edited provided
            // that workspace matches and versioning is enabled for the table.
            $versionState = new VersionState($recData['t3ver_state'] ?? 0);
            if ($tableSupportsVersioning
                && (
                    $versionState->equals(VersionState::NEW_PLACEHOLDER) || (int)(($recData['t3ver_oid'] ?? 0) > 0)
                )
            ) {
                if ((int)$recData['t3ver_wsid'] !== $this->workspace) {
                    // So does workspace match?
                    return 'Workspace ID of record didn\'t match current workspace';
                }
                // So is the user allowed to "use" the edit stage within the workspace?
                return $this->workspaceCheckStageForCurrent(0)

The expression return $this->workspaceCheckStageForCurrent(0) ? false : 'User's access level did not allow for editing' could also return false which is incompatible with the documented return type string. Did you maybe forget to handle an error condition?

                        ? false
                        : 'User\'s access level did not allow for editing';
            }
            // Check if we are testing a "live" record
            if ($this->workspaceAllowsLiveEditingInTable($table)) {
                // Live records are OK in the current workspace
                return false;

The expression return false returns the type false which is incompatible with the documented return type string.

            }
            // If not offline, output error
            return 'Online record was not in a workspace!';
        }
        return 'No record';
    }

    /**
     * Evaluates if a user is allowed to edit the offline version
     *
     * @param string $table Table of record
     * @param array|int $recData Integer (record uid) or array where fields are at least: pid, t3ver_wsid, t3ver_stage (if versioningWS is set)
     * @return string String error code, telling the failure state. FALSE=All ok
     * @see workspaceCannotEditRecord()
     * @internal this method will be moved to EXT:workspaces
     */
    public function workspaceCannotEditOfflineVersion($table, $recData)
    {
        if (!BackendUtility::isTableWorkspaceEnabled($table)) {
            return 'Table does not support versioning.';
        }
        if (!is_array($recData)) {
            $recData = BackendUtility::getRecord($table, $recData, 'uid,pid,t3ver_oid,t3ver_wsid,t3ver_state,t3ver_stage');
        }
        if (is_array($recData)) {
            $versionState = new VersionState($recData['t3ver_state']);
            if ($versionState->equals(VersionState::NEW_PLACEHOLDER) || (int)$recData['t3ver_oid'] > 0) {
                return $this->workspaceCannotEditRecord($table, $recData);
            }
            return 'Not an offline version';
        }
        return 'No record';
    }

    /**
     * Checks if a record is allowed to be edited in the current workspace.
     * This is not bound to an actual record, but to the mere fact if the user is in a workspace
     * and depending on the table settings.
     *
     * @param string $table
     * @return bool
     * @internal should only be used from within TYPO3 Core
     */
    public function workspaceAllowsLiveEditingInTable(string $table): bool
    {
        // In live workspace the record can be added/modified
        if ($this->workspace === 0) {
            return true;
        }
        // Workspace setting allows to "live edit" records of tables without versioning
        if ($this->workspaceRec['live_edit'] && !BackendUtility::isTableWorkspaceEnabled($table)) {
            return true;
        }
        // Always for Live workspace AND if live-edit is enabled
        // and tables are completely without versioning it is ok as well.
        if ($GLOBALS['TCA'][$table]['ctrl']['versioningWS_alwaysAllowLiveEdit']) {
            return true;
        }
        // If the answer is FALSE it means the only valid way to create or edit records by creating records in the workspace
        return false;
    }

    /**
     * Evaluates if a record from $table can be created. If the table is not set up for versioning,
     * and the "live edit" flag of the page is set, return false. In live workspace this is always true,
     * as all records can be created in live workspace
     *
     * @param string $table Table name
     * @return bool
     * @internal should only be used from within TYPO3 Core
     */
    public function workspaceCanCreateNewRecord(string $table): bool
    {
        // If LIVE records cannot be created due to workspace restrictions, prepare creation of placeholder-record
        if (!$this->workspaceAllowsLiveEditingInTable($table) && !BackendUtility::isTableWorkspaceEnabled($table)) {
            return false;
        }
        return true;
    }

    /**
     * Evaluates if auto creation of a version of a record is allowed.
     * Auto-creation of version: In offline workspace, test if versioning is
     * enabled and look for workspace version of input record.
     * If there is no versionized record found we will create one and save to that.
     *
     * @param string $table Table of the record
     * @param int $id UID of record
     * @param int $recpid PID of record
     * @return bool TRUE if ok.
     * @internal should only be used from within TYPO3 Core
     */
    public function workspaceAllowAutoCreation($table, $id, $recpid)
    {
        // No version can be created in live workspace
        if ($this->workspace === 0) {
            return false;
        }
        // No versioning support for this table, so no version can be created
        if (!BackendUtility::isTableWorkspaceEnabled($table)) {
            return false;
        }
        if ($recpid < 0) {
            return false;
        }
        // There must be no existing version of this record in workspace
        if (BackendUtility::getWorkspaceVersionOfRecord($this->workspace, $table, $id, 'uid')) {
            return false;
        }
        return true;
    }

    /**
     * Checks if an element stage allows access for the user in the current workspace
     * In live workspace (= 0) access is always granted for any stage.
     * Admins are always allowed.
     * An option for custom workspaces allows members to also edit when the stage is "Review"
     *
     * @param int $stage Stage id from an element: -1,0 = editing, 1 = reviewer, >1 = owner
     * @return bool TRUE if user is allowed access
     * @internal should only be used from within TYPO3 Core
     */
    public function workspaceCheckStageForCurrent($stage)
    {
        // Always allow for admins
        if ($this->isAdmin()) {
            return true;
        }
        // Always OK for live workspace
        if ($this->workspace === 0 || !ExtensionManagementUtility::isLoaded('workspaces')) {
            return true;
        }
        $stage = (int)$stage;
        $stat = $this->checkWorkspaceCurrent();
        $accessType = $stat['_ACCESS'];
        // Workspace owners are always allowed for stage change
        if ($accessType === 'owner') {
            return true;
        }

        // Check if custom staging is activated
        $workspaceRec = BackendUtility::getRecord('sys_workspace', $stat['uid']);
        if ($workspaceRec['custom_stages'] > 0 && $stage !== 0 && $stage !== -10) {
            // Get custom stage record
            $workspaceStageRec = BackendUtility::getRecord('sys_workspace_stage', $stage);
            // Check if the user is responsible for the current stage
            if (
                $accessType === 'member'
                && GeneralUtility::inList($workspaceStageRec['responsible_persons'], 'be_users_' . $this->user['uid'])
            ) {
                return true;
            }
            // Check if the user is in a group which is responsible for the current stage
            foreach ($this->userGroupsUID as $groupUid) {
                if (
                    $accessType === 'member'
                    && GeneralUtility::inList($workspaceStageRec['responsible_persons'], 'be_groups_' . $groupUid)
                ) {
                    return true;
                }
            }
        } elseif ($stage === -10 || $stage === -20) {
            // Nobody is allowed to do that except the owner (which was checked above)
            return false;
        } elseif (
            $accessType === 'reviewer' && $stage <= 1

Consider adding parentheses for clarity. Current Interpretation: ($accessType === 'reviewer' && $stage <= 1) || $accessType === 'member' && $stage <= 0, Probably Intended Meaning: $accessType === 'reviewer' && ($stage <= 1 || $accessType === 'member' && $stage <= 0)

            || $accessType === 'member' && $stage <= 0
        ) {
            return true;
        }
        return false;
    }

    /**
     * Returns TRUE if the user has access to publish content from the workspace ID given.
     * Admin-users are always granted access to do this
     * If the workspace ID is 0 (live) all users have access also
     * For custom workspaces it depends on whether the user is owner OR like with
     * draft workspace if the user has access to Live workspace.
     *
     * @param int $wsid Workspace UID; 0,1+
     * @return bool Returns TRUE if the user has access to publish content from the workspace ID given.
     * @internal this method will be moved to EXT:workspaces
     */
    public function workspacePublishAccess($wsid)
    {
        if ($this->isAdmin()) {
            return true;
        }
        $wsAccess = $this->checkWorkspace($wsid);
        // If no access to workspace, of course you cannot publish!
        if ($wsAccess === false) {

The condition $wsAccess === false is always false.

            return false;
        }
        if ((int)$wsAccess['uid'] === 0) {
            // If access to Live workspace, no problem.
            return true;
        }
        // Custom workspaces
        // 1. Owners can always publish
        if ($wsAccess['_ACCESS'] === 'owner') {
            return true;
        }
        // 2. User has access to online workspace which is OK as well as long as publishing
        // access is not limited by workspace option.
        return $this->checkWorkspace(0) && !($wsAccess['publish_access'] & 2);
    }

    /**
     * Returns full parsed user TSconfig array, merged with TSconfig from groups.
     *
     * Example:
     * [
     *     'options.' => [
     *         'fooEnabled' => '0',
     *         'fooEnabled.' => [
     *             'tt_content' => 1,
     *         ],
     *     ],
     * ]
     *
     * @return array Parsed and merged user TSconfig array
     */
    public function getTSConfig()
    {
        return $this->userTS;
    }

    /**
     * Returns an array with the webmounts.
     * If no webmounts, and empty array is returned.
     * Webmounts permissions are checked in fetchGroupData()
     *
     * @return array of web mounts uids (may include '0')
     */
    public function returnWebmounts()
    {
        return (string)$this->groupData['webmounts'] != '' ? explode(',', $this->groupData['webmounts']) : [];
    }

    /**
     * Initializes the given mount points for the current Backend user.
     *
     * @param array $mountPointUids Page UIDs that should be used as web mountpoints
     * @param bool $append If TRUE the given mount point will be appended. Otherwise the current mount points will be replaced.
     */
    public function setWebmounts(array $mountPointUids, $append = false)
    {
        if (empty($mountPointUids)) {
            return;
        }
        if ($append) {
            $currentWebMounts = GeneralUtility::intExplode(',', $this->groupData['webmounts']);
            $mountPointUids = array_merge($currentWebMounts, $mountPointUids);
        }
        $this->groupData['webmounts'] = implode(',', array_unique($mountPointUids));
    }

    /**
     * Checks for alternative web mount points for the element browser.
     *
     * If there is a temporary mount point active in the page tree it will be used.
     *
     * If the User TSconfig options.pageTree.altElementBrowserMountPoints is not empty the pages configured
     * there are used as web mounts If options.pageTree.altElementBrowserMountPoints.append is enabled,
     * they are appended to the existing webmounts.
     *
     * @internal - do not use in your own extension
     */
    public function initializeWebmountsForElementBrowser()
    {
        $alternativeWebmountPoint = (int)$this->getSessionData('pageTree_temporaryMountPoint');
        if ($alternativeWebmountPoint) {
            $alternativeWebmountPoint = GeneralUtility::intExplode(',', (string)$alternativeWebmountPoint);
            $this->setWebmounts($alternativeWebmountPoint);
            return;
        }

        $alternativeWebmountPoints = trim($this->getTSConfig()['options.']['pageTree.']['altElementBrowserMountPoints'] ?? '');
        $appendAlternativeWebmountPoints = $this->getTSConfig()['options.']['pageTree.']['altElementBrowserMountPoints.']['append'] ?? '';
        if ($alternativeWebmountPoints) {
            $alternativeWebmountPoints = GeneralUtility::intExplode(',', $alternativeWebmountPoints);
            $this->setWebmounts($alternativeWebmountPoints, $appendAlternativeWebmountPoints);

It seems like $appendAlternativeWebmountPoints can also be of type string; however, parameter $append of TYPO3\CMS\Core\Authentication\BackendUserAuthentication::setWebmounts() does only seem to accept boolean, maybe add an additional type check?

        }
    }

    /**
     * Returns TRUE or FALSE, depending if an alert popup (a javascript confirmation) should be shown
     * call like $GLOBALS['BE_USER']->jsConfirmation($BITMASK).
     *
     * @param int $bitmask Bitmask, one of \TYPO3\CMS\Core\Type\Bitmask\JsConfirmation
     * @return bool TRUE if the confirmation should be shown
     * @see JsConfirmation
     */
    public function jsConfirmation($bitmask)
    {
        try {
            $alertPopupsSetting = trim((string)($this->getTSConfig()['options.']['alertPopups'] ?? ''));
            $alertPopup = JsConfirmation::cast($alertPopupsSetting === '' ? null : (int)$alertPopupsSetting);
        } catch (InvalidEnumerationValueException $e) {
            $alertPopup = new JsConfirmation();
        }

        return JsConfirmation::cast($bitmask)->matches($alertPopup);
    }

    /**
     * Initializes a lot of stuff like the access-lists, database-mountpoints and filemountpoints
     * This method is called by ->backendCheckLogin() (from extending BackendUserAuthentication)
     * if the backend user login has verified OK.
     * Generally this is required initialization of a backend user.
     *
     * @internal
     * @see \TYPO3\CMS\Core\TypoScript\Parser\TypoScriptParser
     */
    public function fetchGroupData()
    {
        if ($this->user['uid']) {
            // Get lists for the be_user record and set them as default/primary values.
            // Enabled Backend Modules
            $this->dataLists['modList'] = $this->user['userMods'];
            // Add available widgets
            $this->dataLists['available_widgets'] = $this->user['available_widgets'];
            // Add Allowed Languages
            $this->dataLists['allowed_languages'] = $this->user['allowed_languages'];
            // Set user value for workspace permissions.
            $this->dataLists['workspace_perms'] = $this->user['workspace_perms'];
            // Database mountpoints
            $this->dataLists['webmount_list'] = $this->user['db_mountpoints'];
            // File mountpoints
            $this->dataLists['filemount_list'] = $this->user['file_mountpoints'];
            // Fileoperation permissions
            $this->dataLists['file_permissions'] = $this->user['file_permissions'];

            // BE_GROUPS:
            // Get the groups...
            if (!empty($this->user[$this->usergroup_column])) {
                // Fetch groups will add a lot of information to the internal arrays: modules, accesslists, TSconfig etc.
                // Refer to fetchGroups() function.
                $this->fetchGroups($this->user[$this->usergroup_column]);
            }
            // Populating the $this->userGroupsUID -array with the groups in the order in which they were LAST included.!!
            $this->userGroupsUID = array_reverse(array_unique(array_reverse($this->includeGroupArray)));
            // Finally this is the list of group_uid's in the order they are parsed (including subgroups!)
            // and without duplicates (duplicates are presented with their last entrance in the list,
            // which thus reflects the order of the TypoScript in TSconfig)
            $this->groupList = implode(',', $this->userGroupsUID);
            $this->setCachedList($this->groupList);

            $this->prepareUserTsConfig();

            // Processing webmounts
            // Admin's always have the root mounted
            if ($this->isAdmin() && !($this->getTSConfig()['options.']['dontMountAdminMounts'] ?? false)) {
                $this->dataLists['webmount_list'] = '0,' . $this->dataLists['webmount_list'];
            }
            // The lists are cleaned for duplicates
            $this->groupData['webmounts'] = StringUtility::uniqueList($this->dataLists['webmount_list'] ?? '');
            $this->groupData['pagetypes_select'] = StringUtility::uniqueList($this->dataLists['pagetypes_select'] ?? '');
            $this->groupData['tables_select'] = StringUtility::uniqueList(($this->dataLists['tables_modify'] ?? '') . ',' . ($this->dataLists['tables_select'] ?? ''));
            $this->groupData['tables_modify'] = StringUtility::uniqueList($this->dataLists['tables_modify'] ?? '');
            $this->groupData['non_exclude_fields'] = StringUtility::uniqueList($this->dataLists['non_exclude_fields'] ?? '');
            $this->groupData['explicit_allowdeny'] = StringUtility::uniqueList($this->dataLists['explicit_allowdeny'] ?? '');
            $this->groupData['allowed_languages'] = StringUtility::uniqueList($this->dataLists['allowed_languages'] ?? '');
            $this->groupData['custom_options'] = StringUtility::uniqueList($this->dataLists['custom_options'] ?? '');
            $this->groupData['modules'] = StringUtility::uniqueList($this->dataLists['modList'] ?? '');
            $this->groupData['available_widgets'] = StringUtility::uniqueList($this->dataLists['available_widgets'] ?? '');
            $this->groupData['file_permissions'] = StringUtility::uniqueList($this->dataLists['file_permissions'] ?? '');
            $this->groupData['workspace_perms'] = $this->dataLists['workspace_perms'];

            // Check if the user access to all web mounts set
            if (!empty(trim($this->groupData['webmounts']))) {
                $validWebMounts = $this->filterValidWebMounts($this->groupData['webmounts']);
                $this->groupData['webmounts'] = implode(',', $validWebMounts);
            }
            // Setting up workspace situation (after webmounts are processed!):
            $this->workspaceInit();
        }
    }

    /**
     * Checking read access to web mounts, but keeps "0" or empty strings.
     * In any case, checks if the list of pages is visible for the backend user but also
     * if the page is not deleted.
     *
     * @param string $listOfWebMounts a comma-separated list of webmounts, could also be empty, or contain "0"
     * @return array a list of all valid web mounts the user has access to
     */
    protected function filterValidWebMounts(string $listOfWebMounts): array
    {
        // Checking read access to web mounts if there are mounts points (not empty string, false or 0)
        $allWebMounts = explode(',', $listOfWebMounts);
        // Selecting all web mounts with permission clause for reading
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('pages');
        $queryBuilder->getRestrictions()
            ->removeAll()
            ->add(GeneralUtility::makeInstance(DeletedRestriction::class));

        $readablePagesOfWebMounts = $queryBuilder->select('uid')
            ->from('pages')
            // @todo DOCTRINE: check how to make getPagePermsClause() portable
            ->where(
                $this->getPagePermsClause(Permission::PAGE_SHOW),
                $queryBuilder->expr()->in(
                    'uid',
                    $queryBuilder->createNamedParameter(
                        GeneralUtility::intExplode(',', $listOfWebMounts),
                        Connection::PARAM_INT_ARRAY
                    )
                )
            )
            ->execute()
            ->fetchAll();
        $readablePagesOfWebMounts = array_column(($readablePagesOfWebMounts ?: []), 'uid', 'uid');
        foreach ($allWebMounts as $key => $mountPointUid) {
            // If the mount ID is NOT found among selected pages, unset it:
            if ($mountPointUid > 0 && !isset($readablePagesOfWebMounts[$mountPointUid])) {
                unset($allWebMounts[$key]);
            }
        }
        return $allWebMounts;
    }

    /**
     * This method parses the UserTSconfig from the current user and all their groups.
     * If the contents are the same, parsing is skipped. No matching is applied here currently.
     */
    protected function prepareUserTsConfig(): void
    {
        $collectedUserTSconfig = [
            'default' => $GLOBALS['TYPO3_CONF_VARS']['BE']['defaultUserTSconfig']
        ];
        // Default TSconfig for admin-users
        if ($this->isAdmin()) {
            $collectedUserTSconfig[] = 'admPanel.enable.all = 1';
        }
        // Setting defaults for sys_note author / email
        $collectedUserTSconfig[] = '
TCAdefaults.sys_note.author = ' . $this->user['realName'] . '
TCAdefaults.sys_note.email = ' . $this->user['email'];

        // Loop through all groups and add their 'TSconfig' fields
        foreach ($this->includeGroupArray as $groupId) {
            $collectedUserTSconfig['group_' . $groupId] = $this->userGroups[$groupId]['TSconfig'] ?? '';
        }

        $collectedUserTSconfig[] = $this->user['TSconfig'];
        // Check external files
        $collectedUserTSconfig = TypoScriptParser::checkIncludeLines_array($collectedUserTSconfig);
        // Imploding with "[global]" will make sure that non-ended confinements with braces are ignored.
        $userTS_text = implode("\n[GLOBAL]\n", $collectedUserTSconfig);
        // Parsing the user TSconfig (or getting from cache)
        $hash = md5('userTS:' . $userTS_text);
        $cache = GeneralUtility::makeInstance(CacheManager::class)->getCache('hash');
        if (!($this->userTS = $cache->get($hash))) {
            $parseObj = GeneralUtility::makeInstance(TypoScriptParser::class);
            $conditionMatcher = GeneralUtility::makeInstance(ConditionMatcher::class);
            $parseObj->parse($userTS_text, $conditionMatcher);
            $this->userTS = $parseObj->setup;
            $cache->set($hash, $this->userTS, ['UserTSconfig'], 0);
            // Ensure to update UC later
            $this->userTSUpdated = true;
        }
    }

    /**
     * Fetches the group records, subgroups and fills internal arrays.
     * Function is called recursively to fetch subgroups
     *
     * @param string $grList Commalist of be_groups uid numbers
     * @param string $idList List of already processed be_groups-uids so the function will not fall into an eternal recursion.
     * @internal
     */
    public function fetchGroups($grList, $idList = '')
    {
        // Fetching records of the groups in $grList:
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable($this->usergroup_table);
        $expressionBuilder = $queryBuilder->expr();
        $constraints = $expressionBuilder->andX(
            $expressionBuilder->eq(
                'pid',
                $queryBuilder->createNamedParameter(0, \PDO::PARAM_INT)
            ),
            $expressionBuilder->in(
                'uid',
                $queryBuilder->createNamedParameter(
                    GeneralUtility::intExplode(',', $grList),
                    Connection::PARAM_INT_ARRAY
                )
            )
        );
        // Hook for manipulation of the WHERE sql sentence which controls which BE-groups are included
        foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_userauthgroup.php']['fetchGroupQuery'] ?? [] as $className) {
            $hookObj = GeneralUtility::makeInstance($className);
            if (method_exists($hookObj, 'fetchGroupQuery_processQuery')) {
                $constraints = $hookObj->fetchGroupQuery_processQuery($this, $grList, $idList, (string)$constraints);
            }
        }
        $res = $queryBuilder->select('*')
            ->from($this->usergroup_table)
            ->where($constraints)
            ->execute();
        // The userGroups array is filled
        while ($row = $res->fetch(\PDO::FETCH_ASSOC)) {
            $this->userGroups[$row['uid']] = $row;
        }

        $mountOptions = new BackendGroupMountOption((int)$this->user['options']);
        // Traversing records in the correct order
        foreach (explode(',', $grList) as $uid) {
            // Get row:
            $row = $this->userGroups[$uid];
            // Must be an array and $uid should not be in the idList, because then it is somewhere previously in the grouplist
            if (is_array($row) && !GeneralUtility::inList($idList, $uid)) {
                // Include sub groups
                if (trim($row['subgroup'])) {
                    // Make integer list
                    $theList = implode(',', GeneralUtility::intExplode(',', $row['subgroup']));
                    // Call recursively, pass along list of already processed groups so they are not recursed again.
                    $this->fetchGroups($theList, $idList . ',' . $uid);
                }
                // Add the group uid, current list to the internal arrays.
                $this->includeGroupArray[] = $uid;
                // Mount group database-mounts
                if ($mountOptions->shouldUserIncludePageMountsFromAssociatedGroups()) {
                    $this->dataLists['webmount_list'] .= ',' . $row['db_mountpoints'];
                }
                // Mount group file-mounts
                if ($mountOptions->shouldUserIncludeFileMountsFromAssociatedGroups()) {
                    $this->dataLists['filemount_list'] .= ',' . $row['file_mountpoints'];
                }
                // The lists are made: groupMods, tables_select, tables_modify, pagetypes_select, non_exclude_fields, explicit_allowdeny, allowed_languages, custom_options
                $this->dataLists['modList'] .= ',' . $row['groupMods'];
                $this->dataLists['available_widgets'] .= ',' . $row['availableWidgets'];
                $this->dataLists['tables_select'] .= ',' . $row['tables_select'];
                $this->dataLists['tables_modify'] .= ',' . $row['tables_modify'];
                $this->dataLists['pagetypes_select'] .= ',' . $row['pagetypes_select'];
                $this->dataLists['non_exclude_fields'] .= ',' . $row['non_exclude_fields'];
                $this->dataLists['explicit_allowdeny'] .= ',' . $row['explicit_allowdeny'];
                $this->dataLists['allowed_languages'] .= ',' . $row['allowed_languages'];
                $this->dataLists['custom_options'] .= ',' . $row['custom_options'];
                $this->dataLists['file_permissions'] .= ',' . $row['file_permissions'];
                // Setting workspace permissions:
                $this->dataLists['workspace_perms'] |= $row['workspace_perms'];
                // If this function is processing the users OWN group-list (not subgroups) AND
                // if the ->firstMainGroup is not set, then the ->firstMainGroup will be set.
                if ($idList === '' && !$this->firstMainGroup) {
                    $this->firstMainGroup = $uid;

The property $firstMainGroup was declared of type integer, but $uid is of type string. Maybe add a type cast?

                }
            }
        }
        // HOOK: fetchGroups_postProcessing
        foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_userauthgroup.php']['fetchGroups_postProcessing'] ?? [] as $_funcRef) {
            $_params = [];
            GeneralUtility::callUserFunction($_funcRef, $_params, $this);
        }
    }

    /**
     * Updates the field be_users.usergroup_cached_list if the groupList of the user
     * has changed/is different from the current list.
     * The field "usergroup_cached_list" contains the list of groups which the user is a member of.
     * After authentication (where these functions are called...) one can depend on this list being
     * a representation of the exact groups/subgroups which the BE_USER has membership with.
     *
     * @param string $cList The newly compiled group-list which must be compared with the current list in the user record and possibly stored if a difference is detected.
     * @internal
     */
    public function setCachedList($cList)
    {
        if ((string)$cList != (string)$this->user['usergroup_cached_list']) {
            GeneralUtility::makeInstance(ConnectionPool::class)->getConnectionForTable('be_users')->update(
                'be_users',
                ['usergroup_cached_list' => $cList],
                ['uid' => (int)$this->user['uid']]
            );
        }
    }

    /**
     * Sets up all file storages for a user.
     * Needs to be called AFTER the groups have been loaded.
     */
    protected function initializeFileStorages()
    {
        $this->fileStorages = [];
        /** @var \TYPO3\CMS\Core\Resource\StorageRepository $storageRepository */
        $storageRepository = GeneralUtility::makeInstance(StorageRepository::class);
        // Admin users have all file storages visible, without any filters
        if ($this->isAdmin()) {
            $storageObjects = $storageRepository->findAll();
            foreach ($storageObjects as $storageObject) {
                $this->fileStorages[$storageObject->getUid()] = $storageObject;
            }
        } else {
            // Regular users only have storages that are defined in their filemounts
            // Permissions and file mounts for the storage are added in StoragePermissionAspect
            foreach ($this->getFileMountRecords() as $row) {
                if (!array_key_exists((int)$row['base'], $this->fileStorages)) {
                    $storageObject = $storageRepository->findByUid($row['base']);
                    if ($storageObject) {
                        $this->fileStorages[$storageObject->getUid()] = $storageObject;
                    }
                }
            }
        }

        // This has to be called always in order to set certain filters
        $this->evaluateUserSpecificFileFilterSettings();
    }

    /**
     * Returns an array of category mount points. The category permissions from BE Groups
     * are also taken into consideration and are merged into User permissions.
     *
     * @return array
     */
    public function getCategoryMountPoints()
    {
        $categoryMountPoints = '';

        // Category mounts of the groups
        if (is_array($this->userGroups)) {

The condition is_array($this->userGroups) is always true.

            foreach ($this->userGroups as $group) {
                if ($group['category_perms']) {
                    $categoryMountPoints .= ',' . $group['category_perms'];
                }
            }
        }

        // Category mounts of the user record
        if ($this->user['category_perms']) {
            $categoryMountPoints .= ',' . $this->user['category_perms'];
        }

        // Make the ids unique
        $categoryMountPoints = GeneralUtility::trimExplode(',', $categoryMountPoints);
        $categoryMountPoints = array_filter($categoryMountPoints); // remove empty value
        $categoryMountPoints = array_unique($categoryMountPoints); // remove unique value

        return $categoryMountPoints;
    }

    /**
     * Returns an array of file mount records, taking workspaces and user home and group home directories into account
     * Needs to be called AFTER the groups have been loaded.
     *
     * @return array
     * @internal
     */
    public function getFileMountRecords()
    {
        $runtimeCache = GeneralUtility::makeInstance(CacheManager::class)->getCache('runtime');
        $fileMountRecordCache = $runtimeCache->get('backendUserAuthenticationFileMountRecords') ?: [];

        if (!empty($fileMountRecordCache)) {
            return $fileMountRecordCache;
        }

        $connectionPool = GeneralUtility::makeInstance(ConnectionPool::class);

        // Processing file mounts (both from the user and the groups)
        $fileMounts = array_unique(GeneralUtility::intExplode(',', $this->dataLists['filemount_list'], true));

        // Limit file mounts if set in workspace record
        if ($this->workspace > 0 && !empty($this->workspaceRec['file_mountpoints'])) {
            $workspaceFileMounts = GeneralUtility::intExplode(',', $this->workspaceRec['file_mountpoints'], true);
            $fileMounts = array_intersect($fileMounts, $workspaceFileMounts);
        }

        if (!empty($fileMounts)) {
            $orderBy = $GLOBALS['TCA']['sys_filemounts']['ctrl']['default_sortby'] ?? 'sorting';

            $queryBuilder = $connectionPool->getQueryBuilderForTable('sys_filemounts');
            $queryBuilder->getRestrictions()
                ->removeAll()
                ->add(GeneralUtility::makeInstance(DeletedRestriction::class))
                ->add(GeneralUtility::makeInstance(HiddenRestriction::class))
                ->add(GeneralUtility::makeInstance(RootLevelRestriction::class));

            $queryBuilder->select('*')
                ->from('sys_filemounts')
                ->where(
                    $queryBuilder->expr()->in('uid', $queryBuilder->createNamedParameter($fileMounts, Connection::PARAM_INT_ARRAY))
                );

            foreach (QueryHelper::parseOrderBy($orderBy) as $fieldAndDirection) {
                $queryBuilder->addOrderBy(...$fieldAndDirection);
            }

            $fileMountRecords = $queryBuilder->execute()->fetchAll(\PDO::FETCH_ASSOC);
            if ($fileMountRecords !== false) {
                foreach ($fileMountRecords as $fileMount) {
                    $fileMountRecordCache[$fileMount['base'] . $fileMount['path']] = $fileMount;
                }
            }
        }

        // Read-only file mounts
        $readOnlyMountPoints = \trim($this->getTSConfig()['options.']['folderTree.']['altElementBrowserMountPoints'] ?? '');
        if ($readOnlyMountPoints) {
            // We cannot use the API here but need to fetch the default storage record directly
            // to not instantiate it (which directly applies mount points) before all mount points are resolved!
            $queryBuilder = $connectionPool->getQueryBuilderForTable('sys_file_storage');
            $defaultStorageRow = $queryBuilder->select('uid')
                ->from('sys_file_storage')
                ->where(
                    $queryBuilder->expr()->eq('is_default', $queryBuilder->createNamedParameter(1, \PDO::PARAM_INT))
                )
                ->setMaxResults(1)
                ->execute()
                ->fetch(\PDO::FETCH_ASSOC);

            $readOnlyMountPointArray = GeneralUtility::trimExplode(',', $readOnlyMountPoints);
            foreach ($readOnlyMountPointArray as $readOnlyMountPoint) {
                $readOnlyMountPointConfiguration = GeneralUtility::trimExplode(':', $readOnlyMountPoint);
                if (count($readOnlyMountPointConfiguration) === 2) {
                    // A storage is passed in the configuration
                    $storageUid = (int)$readOnlyMountPointConfiguration[0];
                    $path = $readOnlyMountPointConfiguration[1];
                } else {
                    if (empty($defaultStorageRow)) {
                        throw new \RuntimeException('Read only mount points have been defined in User TsConfig without specific storage, but a default storage could not be resolved.', 1404472382);
                    }
                    // Backwards compatibility: If no storage is passed, we use the default storage
                    $storageUid = $defaultStorageRow['uid'];
                    $path = $readOnlyMountPointConfiguration[0];
                }
                $fileMountRecordCache[$storageUid . $path] = [
                    'base' => $storageUid,
                    'title' => $path,
                    'path' => $path,
                    'read_only' => true
                ];
            }
        }

        // Personal or Group filemounts are not accessible if file mount list is set in workspace record
        if ($this->workspace <= 0 || empty($this->workspaceRec['file_mountpoints'])) {
            // If userHomePath is set, we attempt to mount it
            if ($GLOBALS['TYPO3_CONF_VARS']['BE']['userHomePath']) {
                [$userHomeStorageUid, $userHomeFilter] = explode(':', $GLOBALS['TYPO3_CONF_VARS']['BE']['userHomePath'], 2);
                $userHomeStorageUid = (int)$userHomeStorageUid;
                $userHomeFilter = '/' . ltrim($userHomeFilter, '/');
                if ($userHomeStorageUid > 0) {
                    // Try and mount with [uid]_[username]
                    $path = $userHomeFilter . $this->user['uid'] . '_' . $this->user['username'] . $GLOBALS['TYPO3_CONF_VARS']['BE']['userUploadDir'];
                    $fileMountRecordCache[$userHomeStorageUid . $path] = [
                        'base' => $userHomeStorageUid,
                        'title' => $this->user['username'],
                        'path' => $path,
                        'read_only' => false,
                        'user_mount' => true
                    ];
                    // Try and mount with only [uid]
                    $path = $userHomeFilter . $this->user['uid'] . $GLOBALS['TYPO3_CONF_VARS']['BE']['userUploadDir'];
                    $fileMountRecordCache[$userHomeStorageUid . $path] = [
                        'base' => $userHomeStorageUid,
                        'title' => $this->user['username'],
                        'path' => $path,
                        'read_only' => false,
                        'user_mount' => true
                    ];
                }
            }

            // Mount group home-dirs
            $mountOptions = new BackendGroupMountOption((int)$this->user['options']);
            if ($GLOBALS['TYPO3_CONF_VARS']['BE']['groupHomePath'] !== '' && $mountOptions->shouldUserIncludeFileMountsFromAssociatedGroups()) {
                // If groupHomePath is set, we attempt to mount it
                [$groupHomeStorageUid, $groupHomeFilter] = explode(':', $GLOBALS['TYPO3_CONF_VARS']['BE']['groupHomePath'], 2);
                $groupHomeStorageUid = (int)$groupHomeStorageUid;
                $groupHomeFilter = '/' . ltrim($groupHomeFilter, '/');
                if ($groupHomeStorageUid > 0) {
                    foreach ($this->userGroups as $groupData) {
                        $path = $groupHomeFilter . $groupData['uid'];
                        $fileMountRecordCache[$groupHomeStorageUid . $path] = [
                            'base' => $groupHomeStorageUid,
                            'title' => $groupData['title'],
                            'path' => $path,
                            'read_only' => false,
                            'user_mount' => true
                        ];
                    }
                }
            }
        }

        $runtimeCache->set('backendUserAuthenticationFileMountRecords', $fileMountRecordCache);
        return $fileMountRecordCache;
    }

    /**
     * Returns an array with the filemounts for the user.
     * Each filemount is represented with an array of a "name", "path" and "type".
     * If no filemounts an empty array is returned.
     *
     * @return \TYPO3\CMS\Core\Resource\ResourceStorage[]
     */
    public function getFileStorages()
    {
        // Initializing file mounts after the groups are fetched
        if ($this->fileStorages === null) {
            $this->initializeFileStorages();
        }
        return $this->fileStorages;
    }

    /**
     * Adds filters based on what the user has set
     * this should be done in this place, and called whenever needed,
     * but only when needed
     */
    public function evaluateUserSpecificFileFilterSettings()
    {
        // Add the option for also displaying the non-hidden files
        if ($this->uc['showHiddenFilesAndFolders']) {
            FileNameFilter::setShowHiddenFilesAndFolders(true);
        }
    }

    /**
     * Returns the information about file permissions.
     * Previously, this was stored in the DB field fileoper_perms now it is file_permissions.
     * Besides it can be handled via userTSconfig
     *
     * permissions.file.default {
     * addFile = 1
     * readFile = 1
     * writeFile = 1
     * copyFile = 1
     * moveFile = 1
     * renameFile = 1
     * deleteFile = 1
     *
     * addFolder = 1
     * readFolder = 1
     * writeFolder = 1
     * copyFolder = 1
     * moveFolder = 1
     * renameFolder = 1
     * deleteFolder = 1
     * recursivedeleteFolder = 1
     * }
     *
     * # overwrite settings for a specific storageObject
     * permissions.file.storage.StorageUid {
     * readFile = 1
     * recursivedeleteFolder = 0
     * }
     *
     * Please note that these permissions only apply, if the storage has the
     * capabilities (browseable, writable), and if the driver allows for writing etc
     *
     * @return array
     */
    public function getFilePermissions()
    {
        if (!isset($this->filePermissions)) {
            $filePermissions = [
                // File permissions
                'addFile' => false,
                'readFile' => false,
                'writeFile' => false,
                'copyFile' => false,
                'moveFile' => false,
                'renameFile' => false,
                'deleteFile' => false,
                // Folder permissions
                'addFolder' => false,
                'readFolder' => false,
                'writeFolder' => false,
                'copyFolder' => false,
                'moveFolder' => false,
                'renameFolder' => false,
                'deleteFolder' => false,
                'recursivedeleteFolder' => false
            ];
            if ($this->isAdmin()) {
                $filePermissions = array_map('is_bool', $filePermissions);
            } else {
                $userGroupRecordPermissions = GeneralUtility::trimExplode(',', $this->groupData['file_permissions'] ?? '', true);
                array_walk(
                    $userGroupRecordPermissions,
                    function ($permission) use (&$filePermissions) {
                        $filePermissions[$permission] = true;
                    }
                );

                // Finally overlay any userTSconfig
                $permissionsTsConfig = $this->getTSConfig()['permissions.']['file.']['default.'] ?? [];
                if (!empty($permissionsTsConfig)) {
                    array_walk(
                        $permissionsTsConfig,
                        function ($value, $permission) use (&$filePermissions) {
                            $filePermissions[$permission] = (bool)$value;
                        }
                    );
                }
            }
            $this->filePermissions = $filePermissions;
        }
        return $this->filePermissions;
    }

    /**
     * Gets the file permissions for a storage
     * by merging any storage-specific permissions for a
     * storage with the default settings.
     * Admin users will always get the default settings.
     *
     * @param \TYPO3\CMS\Core\Resource\ResourceStorage $storageObject
     * @return array
     */
    public function getFilePermissionsForStorage(ResourceStorage $storageObject)
    {
        $finalUserPermissions = $this->getFilePermissions();
        if (!$this->isAdmin()) {
            $storageFilePermissions = $this->getTSConfig()['permissions.']['file.']['storage.'][$storageObject->getUid() . '.'] ?? [];
            if (!empty($storageFilePermissions)) {
                array_walk(
                    $storageFilePermissions,
                    function ($value, $permission) use (&$finalUserPermissions) {
                        $finalUserPermissions[$permission] = (bool)$value;
                    }
                );
            }
        }
        return $finalUserPermissions;
    }

    /**
     * Returns a \TYPO3\CMS\Core\Resource\Folder object that is used for uploading
     * files by default.
     * This is used for RTE and its magic images, as well as uploads
     * in the TCEforms fields.
     *
     * The default upload folder for a user is the defaultFolder on the first
     * filestorage/filemount that the user can access and to which files are allowed to be added
     * however, you can set the users' upload folder like this:
     *
     * options.defaultUploadFolder = 3:myfolder/yourfolder/
     *
     * @param int $pid PageUid
     * @param string $table Table name
     * @param string $field Field name
     * @return \TYPO3\CMS\Core\Resource\Folder|bool The default upload folder for this user
     */
    public function getDefaultUploadFolder($pid = null, $table = null, $field = null)
    {
        $uploadFolder = $this->getTSConfig()['options.']['defaultUploadFolder'] ?? '';
        if ($uploadFolder) {
            try {
                $uploadFolder = GeneralUtility::makeInstance(ResourceFactory::class)->getFolderObjectFromCombinedIdentifier($uploadFolder);
            } catch (Exception\FolderDoesNotExistException $e) {
                $uploadFolder = null;
            }
        }
        if (empty($uploadFolder)) {
            foreach ($this->getFileStorages() as $storage) {
                if ($storage->isDefault() && $storage->isWritable()) {
                    try {
                        $uploadFolder = $storage->getDefaultFolder();
                        if ($uploadFolder->checkActionPermission('write')) {
                            break;
                        }
                        $uploadFolder = null;
                    } catch (Exception $folderAccessException) {
                        // If the folder is not accessible (no permissions / does not exist) we skip this one.
                    }
                    break;
                }
            }
            if (!$uploadFolder instanceof Folder) {
                /** @var ResourceStorage $storage */
                foreach ($this->getFileStorages() as $storage) {
                    if ($storage->isWritable()) {
                        try {
                            $uploadFolder = $storage->getDefaultFolder();
                            if ($uploadFolder->checkActionPermission('write')) {
                                break;
                            }
                            $uploadFolder = null;
                        } catch (Exception $folderAccessException) {
                            // If the folder is not accessible (no permissions / does not exist) try the next one.
                        }
                    }
                }
            }
        }

        // HOOK: getDefaultUploadFolder
        foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_userauthgroup.php']['getDefaultUploadFolder'] ?? [] as $_funcRef) {
            $_params = [
                'uploadFolder' => $uploadFolder,
                'pid' => $pid,
                'table' => $table,
                'field' => $field,
            ];
            $uploadFolder = GeneralUtility::callUserFunction($_funcRef, $_params, $this);
        }

        if ($uploadFolder instanceof Folder) {
            return $uploadFolder;
        }
        return false;
    }

    /**
     * Returns a \TYPO3\CMS\Core\Resource\Folder object that could be used for uploading
     * temporary files in user context. The folder _temp_ below the default upload folder
     * of the user is used.
     *
     * @return \TYPO3\CMS\Core\Resource\Folder|null
     * @see \TYPO3\CMS\Core\Authentication\BackendUserAuthentication::getDefaultUploadFolder()
     */
    public function getDefaultUploadTemporaryFolder()
    {
        $defaultTemporaryFolder = null;
        $defaultFolder = $this->getDefaultUploadFolder();

        if ($defaultFolder !== false) {
            $tempFolderName = '_temp_';
            $createFolder = !$defaultFolder->hasFolder($tempFolderName);
            if ($createFolder === true) {
                try {
                    $defaultTemporaryFolder = $defaultFolder->createFolder($tempFolderName);
                } catch (Exception $folderAccessException) {

Consider adding a comment why this CATCH block is empty.

                }
            } else {
                $defaultTemporaryFolder = $defaultFolder->getSubfolder($tempFolderName);
            }
        }

        return $defaultTemporaryFolder;
    }

    /**
     * Initializing workspace.
     * Called from within this function, see fetchGroupData()
     *
     * @see fetchGroupData()
     * @internal should only be used from within TYPO3 Core
     */
    public function workspaceInit()
    {
        // Initializing workspace by evaluating and setting the workspace, possibly updating it in the user record!
        $this->setWorkspace($this->user['workspace_id']);
        // Limiting the DB mountpoints if there any selected in the workspace record
        $this->initializeDbMountpointsInWorkspace();
        $allowed_languages = (string)($this->getTSConfig()['options.']['workspaces.']['allowed_languages.'][$this->workspace] ?? '');
        if ($allowed_languages !== '') {
            $this->groupData['allowed_languages'] = StringUtility::uniqueList($allowed_languages);
        }
    }

    /**
     * Limiting the DB mountpoints if there any selected in the workspace record
     */
    protected function initializeDbMountpointsInWorkspace()
    {
        $dbMountpoints = trim($this->workspaceRec['db_mountpoints'] ?? '');
        if ($this->workspace > 0 && $dbMountpoints != '') {
            $filteredDbMountpoints = [];
            // Notice: We cannot call $this->getPagePermsClause(1);
            // as usual because the group-list is not available at this point.
            // But bypassing is fine because all we want here is check if the
            // workspace mounts are inside the current webmounts rootline.
            // The actual permission checking on page level is done elsewhere
            // as usual anyway before the page tree is rendered.
            $readPerms = '1=1';
            // Traverse mount points of the workspace, add them,
            // but make sure they match against the users' DB mounts

            $workspaceWebMounts = GeneralUtility::intExplode(',', $dbMountpoints);
            $webMountsOfUser = GeneralUtility::intExplode(',', $this->dataLists['webmount_list']);
            $webMountsOfUser = array_combine($webMountsOfUser, $webMountsOfUser);

            $entryPointRootLineUids = [];
            foreach ($webMountsOfUser as $webMountPageId) {
                $rootLine = BackendUtility::BEgetRootLine($webMountPageId, '', true);
                $entryPointRootLineUids[$webMountPageId] = array_map('intval', array_column($rootLine, 'uid'));
            }
            foreach ($entryPointRootLineUids as $webMountOfUser => $uidsOfRootLine) {
                // Remove the DB mounts of the user if the DB mount is not in the list of
                // workspace mounts
                foreach ($workspaceWebMounts as $webmountOfWorkspace) {
                    // This workspace DB mount is somewhere in the rootline of the users' web mount,
                    // so this is "OK" to be included
                    if (in_array($webmountOfWorkspace, $uidsOfRootLine, true)) {
                        continue;
                    }
                    // Remove the user's DB Mount (possible via array_combine, see above)
                    unset($webMountsOfUser[$webMountOfUser]);
                }
            }
            $dbMountpoints = array_merge($workspaceWebMounts, $webMountsOfUser);

It seems like $webMountsOfUser can also be of type false; however, parameter $array2 of array_merge() does only seem to accept array|null, maybe add an additional type check?

            $dbMountpoints = array_unique($dbMountpoints);
            foreach ($dbMountpoints as $mpId) {
                if ($this->isInWebMount($mpId, $readPerms)) {

The expression $this->isInWebMount($mpId, $readPerms) of type integer|null is loosely compared to true; this is ambiguous if the integer can be 0. You might want to explicitly use !== null instead.

                    $filteredDbMountpoints[] = $mpId;
                }
            }
            // Re-insert webmounts
            $this->groupData['webmounts'] = implode(',', $filteredDbMountpoints);
        }
    }

    /**
     * Checking if a workspace is allowed for backend user
     *
     * @param mixed $wsRec If integer, workspace record is looked up, if array it is seen as a Workspace record with at least uid, title, members and adminusers columns. Can be faked for workspaces uid 0 and -1 (online and offline)
     * @param string $fields List of fields to select. Default fields are all
     * @return array Output will also show how access was granted. Admin users will have a true output regardless of input.
     * @internal should only be used from within TYPO3 Core
     */
    public function checkWorkspace($wsRec, $fields = '*')
    {
        $retVal = false;
        // If not array, look up workspace record:
        if (!is_array($wsRec)) {
            switch ((string)$wsRec) {
                case '0':
                    $wsRec = ['uid' => $wsRec];
                    break;
                default:
                    if (ExtensionManagementUtility::isLoaded('workspaces')) {
                        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('sys_workspace');
                        $queryBuilder->getRestrictions()->add(GeneralUtility::makeInstance(RootLevelRestriction::class));
                        $wsRec = $queryBuilder->select(...GeneralUtility::trimExplode(',', $fields))
                            ->from('sys_workspace')
                            ->where($queryBuilder->expr()->eq(
                                'uid',
                                $queryBuilder->createNamedParameter($wsRec, \PDO::PARAM_INT)
                            ))
                            ->orderBy('title')
                            ->setMaxResults(1)
                            ->execute()
                            ->fetch(\PDO::FETCH_ASSOC);
                    }
            }
        }
        // If wsRec is set to an array, evaluate it:
        if (is_array($wsRec)) {
            if ($this->isAdmin()) {
                return array_merge($wsRec, ['_ACCESS' => 'admin']);
            }
            switch ((string)$wsRec['uid']) {
                    case '0':
                        $retVal = (($this->groupData['workspace_perms'] ?? 0) & 1)
                            ? array_merge($wsRec, ['_ACCESS' => 'online'])
                            : false;
                        break;
                    default:
                        // Checking if the guy is admin:
                        if (GeneralUtility::inList($wsRec['adminusers'], 'be_users_' . $this->user['uid'])) {
                            return array_merge($wsRec, ['_ACCESS' => 'owner']);
                        }
                        // Checking if he is owner through a user group of his:
                        foreach ($this->userGroupsUID as $groupUid) {
                            if (GeneralUtility::inList($wsRec['adminusers'], 'be_groups_' . $groupUid)) {
                                return array_merge($wsRec, ['_ACCESS' => 'owner']);
                            }
                        }
                        // Checking if he is member as user:
                        if (GeneralUtility::inList($wsRec['members'], 'be_users_' . $this->user['uid'])) {
                            return array_merge($wsRec, ['_ACCESS' => 'member']);
                        }
                        // Checking if he is member through a user group of his:
                        foreach ($this->userGroupsUID as $groupUid) {
                            if (GeneralUtility::inList($wsRec['members'], 'be_groups_' . $groupUid)) {
                                return array_merge($wsRec, ['_ACCESS' => 'member']);
                            }
                        }
                }
        }
        return $retVal;

The expression return $retVal could also return false which is incompatible with the documented return type array. Did you maybe forget to handle an error condition?

    }

    /**
     * Uses checkWorkspace() to check if current workspace is available for user.
     * This function caches the result and so can be called many times with no performance loss.
     *
     * @return array See checkWorkspace()
     * @see checkWorkspace()
     * @internal should only be used from within TYPO3 Core
     */
    public function checkWorkspaceCurrent()
    {
        if (!isset($this->checkWorkspaceCurrent_cache)) {
            $this->checkWorkspaceCurrent_cache = $this->checkWorkspace($this->workspace);
        }
        return $this->checkWorkspaceCurrent_cache;
    }

    /**
     * Setting workspace ID
     *
     * @param int $workspaceId ID of workspace to set for backend user. If not valid the default workspace for BE user is found and set.
     * @internal should only be used from within TYPO3 Core
     */
    public function setWorkspace($workspaceId)
    {
        // Check workspace validity and if not found, revert to default workspace.
        if (!$this->setTemporaryWorkspace($workspaceId)) {
            $this->setDefaultWorkspace();
        }
        // Unset access cache:
        $this->checkWorkspaceCurrent_cache = null;
        // If ID is different from the stored one, change it:
        if ((int)$this->workspace !== (int)$this->user['workspace_id']) {
            $this->user['workspace_id'] = $this->workspace;
            GeneralUtility::makeInstance(ConnectionPool::class)->getConnectionForTable('be_users')->update(
                'be_users',
                ['workspace_id' => $this->user['workspace_id']],
                ['uid' => (int)$this->user['uid']]
            );
            $this->writelog(SystemLogType::EXTENSION, SystemLogGenericAction::UNDEFINED, SystemLogErrorClassification::MESSAGE, 0, 'User changed workspace to "' . $this->workspace . '"', []);
        }
    }

    /**
     * Sets a temporary workspace in the context of the current backend user.
     *
     * @param int $workspaceId
     * @return bool
     * @internal should only be used from within TYPO3 Core
     */
    public function setTemporaryWorkspace($workspaceId)
    {
        $result = false;
        $workspaceRecord = $this->checkWorkspace($workspaceId);

        if ($workspaceRecord) {

The expression $workspaceRecord of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

            $this->workspaceRec = $workspaceRecord;
            $this->workspace = (int)$workspaceId;
            $result = true;
        }

        return $result;
    }

    /**
     * Sets the default workspace in the context of the current backend user.
     * @internal should only be used from within TYPO3 Core
     */
    public function setDefaultWorkspace()
    {
        $this->workspace = (int)$this->getDefaultWorkspace();
        $this->workspaceRec = $this->checkWorkspace($this->workspace);
    }

    /**
     * Return default workspace ID for user,
     * if EXT:workspaces is not installed the user will be pushed to the
     * Live workspace, if he has access to. If no workspace is available for the user, the workspace ID is set to "-99"
     *
     * @return int Default workspace id.
     * @internal should only be used from within TYPO3 Core
     */
    public function getDefaultWorkspace()
    {
        if (!ExtensionManagementUtility::isLoaded('workspaces')) {
            return 0;
        }
        // Online is default
        if ($this->checkWorkspace(0)) {
            return 0;
        }
        // Otherwise -99 is the fallback
        $defaultWorkspace = -99;
        // Traverse all workspaces
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('sys_workspace');
        $queryBuilder->getRestrictions()->add(GeneralUtility::makeInstance(RootLevelRestriction::class));
        $result = $queryBuilder->select('*')
            ->from('sys_workspace')
            ->orderBy('title')
            ->execute();
        while ($workspaceRecord = $result->fetch()) {
            if ($this->checkWorkspace($workspaceRecord)) {
                $defaultWorkspace = (int)$workspaceRecord['uid'];
                break;
            }
        }
        return $defaultWorkspace;
    }

    /**
     * Writes an entry in the logfile/table
     * Documentation in "TYPO3 Core API"
     *
     * @param int $type Denotes which module that has submitted the entry. See "TYPO3 Core API". Use "4" for extensions.
     * @param int $action Denotes which specific operation that wrote the entry. Use "0" when no sub-categorizing applies
     * @param int $error Flag. 0 = message, 1 = error (user problem), 2 = System Error (which should not happen), 3 = security notice (admin)
     * @param int $details_nr The message number. Specific for each $type and $action. This will make it possible to translate errormessages to other languages
     * @param string $details Default text that follows the message (in english!). Possibly translated by identification through type/action/details_nr
     * @param array $data Data that follows the log. Might be used to carry special information. If an array the first 5 entries (0-4) will be sprintf'ed with the details-text
     * @param string $tablename Table name. Special field used by tce_main.php.
     * @param int|string $recuid Record UID. Special field used by tce_main.php.
     * @param int|string $recpid Record PID. Special field used by tce_main.php. OBSOLETE
     * @param int $event_pid The page_uid (pid) where the event occurred. Used to select log-content for specific pages.
     * @param string $NEWid Special field used by tce_main.php. NEWid string of newly created records.
     * @param int $userId Alternative Backend User ID (used for logging login actions where this is not yet known).
     * @return int Log entry ID.
     */
    public function writelog($type, $action, $error, $details_nr, $details, $data, $tablename = '', $recuid = '', $recpid = '', $event_pid = -1, $NEWid = '', $userId = 0)
    {
        if (!$userId && !empty($this->user['uid'])) {
            $userId = $this->user['uid'];
        }

        if ($backuserid = $this->getOriginalUserIdWhenInSwitchUserMode()) {
            if (empty($data)) {
                $data = [];
            }
            $data['originalUser'] = $backuserid;
        }

        $fields = [
            'userid' => (int)$userId,
            'type' => (int)$type,
            'action' => (int)$action,
            'error' => (int)$error,
            'details_nr' => (int)$details_nr,
            'details' => $details,
            'log_data' => serialize($data),
            'tablename' => $tablename,
            'recuid' => (int)$recuid,
            'IP' => (string)GeneralUtility::getIndpEnv('REMOTE_ADDR'),
            'tstamp' => $GLOBALS['EXEC_TIME'] ?? time(),
            'event_pid' => (int)$event_pid,
            'NEWid' => $NEWid,
            'workspace' => $this->workspace
        ];

        $connection = GeneralUtility::makeInstance(ConnectionPool::class)->getConnectionForTable('sys_log');
        $connection->insert(
            'sys_log',
            $fields,
            [
                \PDO::PARAM_INT,
                \PDO::PARAM_INT,
                \PDO::PARAM_INT,
                \PDO::PARAM_INT,
                \PDO::PARAM_INT,
                \PDO::PARAM_STR,
                \PDO::PARAM_STR,
                \PDO::PARAM_STR,
                \PDO::PARAM_INT,
                \PDO::PARAM_STR,
                \PDO::PARAM_INT,
                \PDO::PARAM_INT,
                \PDO::PARAM_STR,
                \PDO::PARAM_STR,
            ]
        );

        return (int)$connection->lastInsertId('sys_log');
    }

    /**
     * Getter for the cookie name
     *
     * @static
     * @return string returns the configured cookie name
     */
    public static function getCookieName()
    {
        $configuredCookieName = trim($GLOBALS['TYPO3_CONF_VARS']['BE']['cookieName']);
        if (empty($configuredCookieName)) {
            $configuredCookieName = 'be_typo_user';
        }
        return $configuredCookieName;
    }

    /**
     * Check if user is logged in and if so, call ->fetchGroupData() to load group information and
     * access lists of all kind, further check IP, set the ->uc array.
     * If no user is logged in the default behaviour is to exit with an error message.
     * This function is called right after ->start() in fx. the TYPO3 Bootstrap.
     *
     * @param bool $proceedIfNoUserIsLoggedIn if this option is set, then there won't be a redirect to the login screen of the Backend - used for areas in the backend which do not need user rights like the login page.
     * @throws \RuntimeException
     */
    public function backendCheckLogin($proceedIfNoUserIsLoggedIn = false)
    {
        if (empty($this->user['uid'])) {
            if ($proceedIfNoUserIsLoggedIn === false) {
                $url = GeneralUtility::getIndpEnv('TYPO3_SITE_URL') . TYPO3_mainDir;
                throw new ImmediateResponseException(new RedirectResponse($url, 303), 1607271747);
            }
        } else {
            // ...and if that's the case, call these functions
            $this->fetchGroupData();
            // The groups are fetched and ready for permission checking in this initialization.
            // Tables.php must be read before this because stuff like the modules has impact in this
            if ($this->isUserAllowedToLogin()) {
                // Setting the UC array. It's needed with fetchGroupData first, due to default/overriding of values.
                $this->backendSetUC();
                if ($this->loginSessionStarted) {
                    // Also, if there is a recovery link set, unset it now
                    // this will be moved into its own Event at a later stage.
                    // If a token was set previously, this is now unset, as it was now possible to log-in
                    if ($this->user['password_reset_token'] ?? '') {
                        GeneralUtility::makeInstance(ConnectionPool::class)
                            ->getConnectionForTable($this->user_table)
                            ->update($this->user_table, ['password_reset_token' => ''], ['uid' => $this->user['uid']]);
                    }
                    // Process hooks
                    $hooks = $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_userauthgroup.php']['backendUserLogin'];
                    foreach ($hooks ?? [] as $_funcRef) {
                        $_params = ['user' => $this->user];
                        GeneralUtility::callUserFunction($_funcRef, $_params, $this);
                    }
                }
            } else {
                throw new \RuntimeException('Login Error: TYPO3 is in maintenance mode at the moment. Only administrators are allowed access.', 1294585860);
            }
        }
    }

    /**
     * Initialize the internal ->uc array for the backend user
     * Will make the overrides if necessary, and write the UC back to the be_users record if changes has happened
     *
     * @internal
     */
    public function backendSetUC()
    {
        // UC - user configuration is a serialized array inside the user object
        // If there is a saved uc we implement that instead of the default one.
        $this->unpack_uc();
        // Setting defaults if uc is empty
        $updated = false;
        $originalUc = [];
        if (is_array($this->uc) && isset($this->uc['ucSetByInstallTool'])) {
            $originalUc = $this->uc;
            unset($originalUc['ucSetByInstallTool'], $this->uc);
        }
        if (!is_array($this->uc)) {
            $this->uc = array_merge(
                $this->uc_default,
                (array)$GLOBALS['TYPO3_CONF_VARS']['BE']['defaultUC'],
                GeneralUtility::removeDotsFromTS((array)($this->getTSConfig()['setup.']['default.'] ?? [])),
                $originalUc
            );
            $this->overrideUC();
            $updated = true;
        }
        // If TSconfig is updated, update the defaultUC.
        if ($this->userTSUpdated) {
            $this->overrideUC();
            $updated = true;
        }
        // Setting default lang from be_user record.
        if (!isset($this->uc['lang'])) {
            $this->uc['lang'] = $this->user['lang'];
            $updated = true;
        }
        // Setting the time of the first login:
        if (!isset($this->uc['firstLoginTimeStamp'])) {
            $this->uc['firstLoginTimeStamp'] = $GLOBALS['EXEC_TIME'];
            $updated = true;
        }
        // Saving if updated.
        if ($updated) {
            $this->writeUC();
        }
    }

    /**
     * Override: Call this function every time the uc is updated.
     * That is 1) by reverting to default values, 2) in the setup-module, 3) userTS changes (userauthgroup)
     *
     * @internal
     */
    public function overrideUC()
    {
        $this->uc = array_merge((array)$this->uc, (array)($this->getTSConfig()['setup.']['override.'] ?? []));
    }

    /**
     * Clears the user[uc] and ->uc to blank strings. Then calls ->backendSetUC() to fill it again with reset contents
     *
     * @internal
     */
    public function resetUC()
    {
        $this->user['uc'] = '';
        $this->uc = '';

It seems like '' of type string is incompatible with the declared type array of property $uc.

        $this->backendSetUC();
    }

    /**
     * Determines whether a backend user is allowed to access the backend.
     *
     * The conditions are:
     * + backend user is a regular user and adminOnly is not defined
     * + backend user is an admin user
     * + backend user is used in CLI context and adminOnly is explicitly set to "2" (see CommandLineUserAuthentication)
     * + backend user is being controlled by an admin user
     *
     * @return bool Whether a backend user is allowed to access the backend
     */
    protected function isUserAllowedToLogin()
    {
        $isUserAllowedToLogin = false;
        $adminOnlyMode = (int)$GLOBALS['TYPO3_CONF_VARS']['BE']['adminOnly'];
        // Backend user is allowed if adminOnly is not set or user is an admin:
        if (!$adminOnlyMode || $this->isAdmin()) {
            $isUserAllowedToLogin = true;
        } elseif ($backUserId = $this->getOriginalUserIdWhenInSwitchUserMode()) {
            $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('be_users');
            $isUserAllowedToLogin = (bool)$queryBuilder->count('uid')
                ->from('be_users')
                ->where(
                    $queryBuilder->expr()->eq(
                        'uid',
                        $queryBuilder->createNamedParameter($backUserId, \PDO::PARAM_INT)
                    ),
                    $queryBuilder->expr()->eq('admin', $queryBuilder->createNamedParameter(1, \PDO::PARAM_INT))
                )
                ->execute()
                ->fetchColumn(0);
        }
        return $isUserAllowedToLogin;
    }

    /**
     * Logs out the current user and clears the form protection tokens.
     */
    public function logoff()
    {
        if (isset($GLOBALS['BE_USER'])
            && $GLOBALS['BE_USER'] instanceof self
            && isset($GLOBALS['BE_USER']->user['uid'])
        ) {
            FormProtectionFactory::get()->clean();
            // Release the locked records
            $this->releaseLockedRecords((int)$GLOBALS['BE_USER']->user['uid']);

            if ($this->isSystemMaintainer()) {
                // If user is system maintainer, destroy its possibly valid install tool session.
                $session = new SessionService();
                $session->destroySession();
            }
        }
        parent::logoff();
    }

    /**
     * Remove any "locked records" added for editing for the given user (= current backend user)
     * @param int $userId
     */
    protected function releaseLockedRecords(int $userId)
    {
        if ($userId > 0) {
            GeneralUtility::makeInstance(ConnectionPool::class)
                ->getConnectionForTable('sys_lockedrecords')
                ->delete(
                    'sys_lockedrecords',
                    ['userid' => $userId]
                );
        }
    }

    /**
     * Returns the uid of the backend user to return to.
     * This is set when the current session is a "switch-user" session.
     *
     * @return int|null The user id
     * @internal should only be used from within TYPO3 Core
     */
    public function getOriginalUserIdWhenInSwitchUserMode(): ?int
    {
        $originalUserId = $this->getSessionData('backuserid');
        return $originalUserId ? (int)$originalUserId : null;
    }
}