<?php

use dokuwiki\Extension\AdminPlugin;
use dokuwiki\Utf8\Sort;

/**
 * ACL administration functions
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Andreas Gohr <andi@splitbrain.org>
 * @author     Anika Henke <anika@selfthinker.org> (concepts)
 * @author     Frank Schubert <frank@schokilade.de> (old version)
 */

/**
 * All DokuWiki plugins to extend the admin function
 * need to inherit from this class
 */
class admin_plugin_acl extends AdminPlugin
{
    public $acl;
    protected $ns;
    /**
     * The currently selected item, associative array with id and type.
     * Populated from (in this order):
     * $_REQUEST['current_ns']
     * $_REQUEST['current_id']
     * $ns
     * $ID
     */
    protected $current_item;
    protected $who = '';
    protected $usersgroups = [];
    protected $specials = [];

    /**
     * return prompt for admin menu
     */
    public function getMenuText($language)
    {
        return $this->getLang('admin_acl');
    }

    /**
     * return sort order for position in admin menu
     */
    public function getMenuSort()
    {
        return 1;
    }

    /**
     * handle user request
     *
     * Initializes internal vars and handles modifications
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    public function handle()
    {
        global $AUTH_ACL;
        global $ID;
        global $auth;
        global $config_cascade;
        global $INPUT;

        // fresh 1:1 copy without replacements
        $AUTH_ACL = file($config_cascade['acl']['default']);

        // namespace given?
        if ($INPUT->str('ns') == '*') {
            $this->ns = '*';
        } else {
            $this->ns = cleanID($INPUT->str('ns'));
        }

        if ($INPUT->str('current_ns')) {
            $this->current_item = ['id' => cleanID($INPUT->str('current_ns')), 'type' => 'd'];
        } elseif ($INPUT->str('current_id')) {
            $this->current_item = ['id' => cleanID($INPUT->str('current_id')), 'type' => 'f'];
        } elseif ($this->ns) {
            $this->current_item = ['id' => $this->ns, 'type' => 'd'];
        } else {
            $this->current_item = ['id' => $ID, 'type' => 'f'];
        }

        // user or group choosen?
        $who = trim($INPUT->str('acl_w'));
        if ($INPUT->str('acl_t') == '__g__' && $who) {
            $this->who = '@' . ltrim($auth->cleanGroup($who), '@');
        } elseif ($INPUT->str('acl_t') == '__u__' && $who) {
            $this->who = ltrim($who, '@');
            if ($this->who != '%USER%' && $this->who != '%GROUP%') { #keep wildcard as is
                $this->who = $auth->cleanUser($this->who);
            }
        } elseif (
            $INPUT->str('acl_t') &&
            $INPUT->str('acl_t') != '__u__' &&
            $INPUT->str('acl_t') != '__g__'
        ) {
            $this->who = $INPUT->str('acl_t');
        } elseif ($who) {
            $this->who = $who;
        }

        // handle modifications
        if ($INPUT->has('cmd') && checkSecurityToken()) {
            $cmd = $INPUT->extract('cmd')->str('cmd');

            // scope for modifications
            if ($this->ns) {
                if ($this->ns == '*') {
                    $scope = '*';
                } else {
                    $scope = $this->ns . ':*';
                }
            } else {
                $scope = $ID;
            }

            if ($cmd == 'save' && $scope && $this->who && $INPUT->has('acl')) {
                // handle additions or single modifications
                $this->deleteACL($scope, $this->who);
                $this->addOrUpdateACL($scope, $this->who, $INPUT->int('acl'));
            } elseif ($cmd == 'del' && $scope && $this->who) {
                // handle single deletions
                $this->deleteACL($scope, $this->who);
            } elseif ($cmd == 'update') {
                $acl = $INPUT->arr('acl');

                // handle update of the whole file
                foreach ($INPUT->arr('del') as $where => $names) {
                    // remove all rules marked for deletion
                    foreach ($names as $who)
                        unset($acl[$where][$who]);
                }
                // prepare lines
                $lines = [];
                // keep header
                foreach ($AUTH_ACL as $line) {
                    if ($line[0] == '#') {
                        $lines[] = $line;
                    } else {
                        break;
                    }
                }
                // re-add all rules
                foreach ($acl as $where => $opt) {
                    foreach ($opt as $who => $perm) {
                        if ($who[0] == '@') {
                            if ($who != '@ALL') {
                                $who = '@' . ltrim($auth->cleanGroup($who), '@');
                            }
                        } elseif ($who != '%USER%' && $who != '%GROUP%') { #keep wildcard as is
                            $who = $auth->cleanUser($who);
                        }
                        $who = auth_nameencode($who, true);
                        $perm = (int)$perm;
                        $lines[] = "$where\t$who\t$perm\n";
                    }
                }
                // save it
                io_saveFile($config_cascade['acl']['default'], implode('', $lines));
            }

            // reload ACL config
            $AUTH_ACL = file($config_cascade['acl']['default']);
        }

        // initialize ACL array
        $this->initAclConfig();
    }

    /**
     * ACL Output function
     *
     * print a table with all significant permissions for the
     * current id
     *
     * @author  Frank Schubert <frank@schokilade.de>
     * @author  Andreas Gohr <andi@splitbrain.org>
     */
    public function html()
    {
        echo '<div id="acl_manager">';
        echo '<h1>' . $this->getLang('admin_acl') . '</h1>';
        echo '<div class="level1">';

        echo '<div id="acl__tree">';
        $this->makeExplorer();
        echo '</div>';

        echo '<div id="acl__detail">';
        $this->printDetail();
        echo '</div>';
        echo '</div>';

        echo '<div class="clearer"></div>';
        echo '<h2>' . $this->getLang('current') . '</h2>';
        echo '<div class="level2">';
        $this->printAclTable();
        echo '</div>';

        echo '<div class="footnotes"><div class="fn">';
        echo '<sup><a id="fn__1" class="fn_bot" href="#fnt__1">1)</a></sup>';
        echo '<div class="content">' . $this->getLang('p_include') . '</div>';
        echo '</div></div>';

        echo '</div>';
    }

    /**
     * returns array with set options for building links
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function getLinkOptions($addopts = null)
    {
        $opts = ['do' => 'admin', 'page' => 'acl'];
        if ($this->ns) $opts['ns'] = $this->ns;
        if ($this->who) $opts['acl_w'] = $this->who;

        if (is_null($addopts)) return $opts;
        return array_merge($opts, $addopts);
    }

    /**
     * Display a tree menu to select a page or namespace
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function makeExplorer()
    {
        global $conf;
        global $ID;
        global $lang;

        $ns = $this->ns;
        if (empty($ns)) {
            $ns = dirname(str_replace(':', '/', $ID));
            if ($ns == '.') $ns = '';
        } elseif ($ns == '*') {
            $ns = '';
        }
        $ns = utf8_encodeFN(str_replace(':', '/', $ns));

        $data = $this->makeTree($ns);

        // wrap a list with the root level around the other namespaces
        array_unshift($data, [
            'level' => 0,
            'id' => '*',
            'type' => 'd',
            'open' => 'true',
            'label' => '[' . $lang['mediaroot'] . ']'
        ]);

        echo html_buildlist(
            $data,
            'acl',
            $this->makeTreeItem(...),
            $this->makeListItem(...)
        );
    }

    /**
     * get a combined list of media and page files
     *
     * also called via AJAX
     *
     * @param string $folder an already converted filesystem folder of the current namespace
     * @param string $limit limit the search to this folder
     * @return array
     */
    public function makeTree($folder, $limit = '')
    {
        global $conf;

        // read tree structure from pages and media
        $data = [];
        search($data, $conf['datadir'], 'search_index', ['ns' => $folder], $limit);
        $media = [];
        search($media, $conf['mediadir'], 'search_index', ['ns' => $folder, 'nofiles' => true], $limit);
        $data = array_merge($data, $media);
        unset($media);

        // combine by sorting and removing duplicates
        usort($data, $this->treeSort(...));
        $count = count($data);
        if ($count > 0) for ($i = 1; $i < $count; $i++) {
            if ($data[$i - 1]['id'] == $data[$i]['id'] && $data[$i - 1]['type'] == $data[$i]['type']) {
                unset($data[$i]);
                $i++;  // duplicate found, next $i can't be a duplicate, so skip forward one
            }
        }
        return $data;
    }

    /**
     * usort callback
     *
     * Sorts the combined trees of media and page files
     */
    public function treeSort($a, $b)
    {
        // handle the trivial cases first
        if ($a['id'] == '') return -1;
        if ($b['id'] == '') return 1;
        // split up the id into parts
        $a_ids = explode(':', $a['id']);
        $b_ids = explode(':', $b['id']);
        // now loop through the parts
        while (count($a_ids) && count($b_ids)) {
            // compare each level from upper to lower
            // until a non-equal component is found
            $cur_result = Sort::strcmp(array_shift($a_ids), array_shift($b_ids));
            if ($cur_result) {
                // if one of the components is the last component and is a file
                // and the other one is either of a deeper level or a directory,
                // the file has to come after the deeper level or directory
                if ($a_ids === [] && $a['type'] == 'f' && (count($b_ids) || $b['type'] == 'd')) return 1;
                if ($b_ids === [] && $b['type'] == 'f' && (count($a_ids) || $a['type'] == 'd')) return -1;
                return $cur_result;
            }
        }
        // The two ids seem to be equal. One of them might however refer
        // to a page, one to a namespace, the namespace needs to be first.
        if ($a_ids === [] && $b_ids === []) {
            if ($a['type'] == $b['type']) return 0;
            if ($a['type'] == 'f') return 1;
            return -1;
        }
        // Now the empty part is either a page in the parent namespace
        // that obviously needs to be after the namespace
        // Or it is the namespace that contains the other part and should be
        // before that other part.
        if ($a_ids === []) return ($a['type'] == 'd') ? -1 : 1;
        if ($b_ids === []) return ($b['type'] == 'd') ? 1 : -1;
        return 0; //shouldn't happen
    }

    /**
     * Display the current ACL for selected where/who combination with
     * selectors and modification form
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function printDetail()
    {
        global $ID;

        echo '<form action="' . wl() . '" method="post" accept-charset="utf-8"><div class="no">';

        echo '<div id="acl__user">';
        echo $this->getLang('acl_perms') . ' ';
        $inl = $this->makeSelect();
        echo sprintf(
            '<input type="text" name="acl_w" class="edit" value="%s" />',
            ($inl) ? '' : hsc(ltrim($this->who, '@'))
        );
        echo '<button type="submit">' . $this->getLang('btn_select') . '</button>';
        echo '</div>';

        echo '<div id="acl__info">';
        $this->printInfo();
        echo '</div>';

        echo '<input type="hidden" name="ns" value="' . hsc($this->ns) . '" />';
        echo '<input type="hidden" name="id" value="' . hsc($ID) . '" />';
        echo '<input type="hidden" name="do" value="admin" />';
        echo '<input type="hidden" name="page" value="acl" />';
        echo '<input type="hidden" name="sectok" value="' . getSecurityToken() . '" />';
        echo '</div></form>';
    }

    /**
     * Print info and editor
     *
     * also loaded via Ajax
     */
    public function printInfo()
    {
        global $ID;

        if ($this->who) {
            $current = $this->getExactPermisson();

            // explain current permissions
            $this->printExplanation($current);
            // load editor
            $this->printAclEditor($current);
        } else {
            echo '<p>';
            if ($this->ns) {
                printf($this->getLang('p_choose_ns'), hsc($this->ns));
            } else {
                printf($this->getLang('p_choose_id'), hsc($ID));
            }
            echo '</p>';

            echo $this->locale_xhtml('help');
        }
    }

    /**
     * Display the ACL editor
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function printAclEditor($current)
    {
        global $lang;

        echo '<fieldset>';
        if (is_null($current)) {
            echo '<legend>' . $this->getLang('acl_new') . '</legend>';
        } else {
            echo '<legend>' . $this->getLang('acl_mod') . '</legend>';
        }

        echo $this->makeCheckboxes($current, empty($this->ns), 'acl');

        if (is_null($current)) {
            echo '<button type="submit" name="cmd[save]">' . $lang['btn_save'] . '</button>';
        } else {
            echo '<button type="submit" name="cmd[save]">' . $lang['btn_update'] . '</button>';
            echo '<button type="submit" name="cmd[del]">' . $lang['btn_delete'] . '</button>';
        }

        echo '</fieldset>';
    }

    /**
     * Explain the currently set permissions in plain english/$lang
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function printExplanation($current)
    {
        global $ID;
        global $auth;

        $who = $this->who;
        $ns = $this->ns;

        // prepare where to check
        if ($ns) {
            if ($ns == '*') {
                $check = '*';
            } else {
                $check = $ns . ':*';
            }
        } else {
            $check = $ID;
        }

        // prepare who to check
        if ($who[0] == '@') {
            $user = '';
            $groups = [ltrim($who, '@')];
        } else {
            $user = $who;
            $info = $auth->getUserData($user);
            if ($info === false) {
                $groups = [];
            } else {
                $groups = $info['grps'];
            }
        }

        // check the permissions
        $perm = auth_aclcheck($check, $user, $groups);

        // build array of named permissions
        $names = [];
        if ($perm) {
            if ($ns) {
                if ($perm >= AUTH_DELETE) $names[] = $this->getLang('acl_perm16');
                if ($perm >= AUTH_UPLOAD) $names[] = $this->getLang('acl_perm8');
                if ($perm >= AUTH_CREATE) $names[] = $this->getLang('acl_perm4');
            }
            if ($perm >= AUTH_EDIT) $names[] = $this->getLang('acl_perm2');
            if ($perm >= AUTH_READ) $names[] = $this->getLang('acl_perm1');
            $names = array_reverse($names);
        } else {
            $names[] = $this->getLang('acl_perm0');
        }

        // print permission explanation
        echo '<p>';
        if ($user) {
            if ($ns) {
                printf($this->getLang('p_user_ns'), hsc($who), hsc($ns), implode(', ', $names));
            } else {
                printf($this->getLang('p_user_id'), hsc($who), hsc($ID), implode(', ', $names));
            }
        } elseif ($ns) {
            printf($this->getLang('p_group_ns'), hsc(ltrim($who, '@')), hsc($ns), implode(', ', $names));
        } else {
            printf($this->getLang('p_group_id'), hsc(ltrim($who, '@')), hsc($ID), implode(', ', $names));
        }
        echo '</p>';

        // add note if admin
        if ($perm == AUTH_ADMIN) {
            echo '<p>' . $this->getLang('p_isadmin') . '</p>';
        } elseif (is_null($current)) {
            echo '<p>' . $this->getLang('p_inherited') . '</p>';
        }
    }


    /**
     * Item formatter for the tree view
     *
     * User function for html_buildlist()
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    public function makeTreeItem($item)
    {
        $ret = '';
        // what to display
        if (!empty($item['label'])) {
            $base = $item['label'];
        } else {
            $base = ':' . $item['id'];
            $base = substr($base, strrpos($base, ':') + 1);
        }

        // highlight?
        if (($item['type'] == $this->current_item['type'] && $item['id'] == $this->current_item['id'])) {
            $cl = ' cur';
        } else {
            $cl = '';
        }

        // namespace or page?
        if ($item['type'] == 'd') {
            if ($item['open']) {
                $img = DOKU_BASE . 'lib/images/minus.gif';
                $alt = '−';
            } else {
                $img = DOKU_BASE . 'lib/images/plus.gif';
                $alt = '+';
            }
            $ret .= '<img src="' . $img . '" alt="' . $alt . '" />';
            $ret .= '<a href="' .
                wl('', $this->getLinkOptions(['ns' => $item['id'], 'sectok' => getSecurityToken()])) .
                '" class="idx_dir' . $cl . '">';
            $ret .= $base;
            $ret .= '</a>';
        } else {
            $ret .= '<a href="' .
                wl('', $this->getLinkOptions(['id' => $item['id'], 'ns' => '', 'sectok' => getSecurityToken()])) .
                '" class="wikilink1' . $cl . '">';
            $ret .= noNS($item['id']);
            $ret .= '</a>';
        }
        return $ret;
    }

    /**
     * List Item formatter
     *
     * @param array $item
     * @return string
     */
    public function makeListItem($item)
    {
        return '<li class="level' . $item['level'] . ' ' .
            ($item['open'] ? 'open' : 'closed') . '">';
    }


    /**
     * Get current ACL settings as multidim array
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    public function initAclConfig()
    {
        global $AUTH_ACL;
        global $conf;
        $acl_config = [];
        $usersgroups = [];

        // get special users and groups
        $this->specials[] = '@ALL';
        $this->specials[] = '@' . $conf['defaultgroup'];
        if ($conf['manager'] != '!!not set!!') {
            $this->specials = array_merge(
                $this->specials,
                array_map(
                    trim(...),
                    explode(',', $conf['manager'])
                )
            );
        }
        $this->specials = array_filter($this->specials);
        $this->specials = array_unique($this->specials);
        Sort::sort($this->specials);

        foreach ($AUTH_ACL as $line) {
            $line = trim(preg_replace('/#.*$/', '', $line)); //ignore comments
            if (!$line) continue;

            $acl = preg_split('/[ \t]+/', $line);
            //0 is pagename, 1 is user, 2 is acl

            $acl[1] = rawurldecode($acl[1]);
            $acl_config[$acl[0]][$acl[1]] = $acl[2];

            // store non-special users and groups for later selection dialog
            $ug = $acl[1];
            if (in_array($ug, $this->specials)) continue;
            $usersgroups[] = $ug;
        }

        $usersgroups = array_unique($usersgroups);
        Sort::sort($usersgroups);
        Sort::ksort($acl_config);
        foreach (array_keys($acl_config) as $pagename) {
            Sort::ksort($acl_config[$pagename]);
        }

        $this->acl = $acl_config;
        $this->usersgroups = $usersgroups;
    }

    /**
     * Display all currently set permissions in a table
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function printAclTable()
    {
        global $lang;
        global $ID;

        echo '<form action="' . wl() . '" method="post" accept-charset="utf-8"><div class="no">';
        if ($this->ns) {
            echo '<input type="hidden" name="ns" value="' . hsc($this->ns) . '" />';
        } else {
            echo '<input type="hidden" name="id" value="' . hsc($ID) . '" />';
        }
        echo '<input type="hidden" name="acl_w" value="' . hsc($this->who) . '" />';
        echo '<input type="hidden" name="do" value="admin" />';
        echo '<input type="hidden" name="page" value="acl" />';
        echo '<input type="hidden" name="sectok" value="' . getSecurityToken() . '" />';
        echo '<div class="table">';
        echo '<table class="inline">';
        echo '<tr>';
        echo '<th>' . $this->getLang('where') . '</th>';
        echo '<th>' . $this->getLang('who') . '</th>';
        echo '<th>' . $this->getLang('perm') . '<sup><a id="fnt__1" class="fn_top" href="#fn__1">1)</a></sup></th>';
        echo '<th>' . $lang['btn_delete'] . '</th>';
        echo '</tr>';
        foreach ($this->acl as $where => $set) {
            foreach ($set as $who => $perm) {
                echo '<tr>';
                echo '<td>';
                if (str_ends_with($where, '*')) {
                    echo '<span class="aclns">' . hsc($where) . '</span>';
                    $ispage = false;
                } else {
                    echo '<span class="aclpage">' . hsc($where) . '</span>';
                    $ispage = true;
                }
                echo '</td>';

                echo '<td>';
                if ($who[0] == '@') {
                    echo '<span class="aclgroup">' . hsc($who) . '</span>';
                } else {
                    echo '<span class="acluser">' . hsc($who) . '</span>';
                }
                echo '</td>';

                echo '<td>';
                echo $this->makeCheckboxes($perm, $ispage, 'acl[' . $where . '][' . $who . ']');
                echo '</td>';

                echo '<td class="check">';
                echo '<input type="checkbox" name="del[' . hsc($where) . '][]" value="' . hsc($who) . '" />';
                echo '</td>';
                echo '</tr>';
            }
        }

        echo '<tr>';
        echo '<th class="action" colspan="4">';
        echo '<button type="submit" name="cmd[update]">' . $lang['btn_update'] . '</button>';
        echo '</th>';
        echo '</tr>';
        echo '</table>';
        echo '</div>';
        echo '</div></form>';
    }

    /**
     * Returns the permission which were set for exactly the given user/group
     * and page/namespace. Returns null if no exact match is available
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     */
    protected function getExactPermisson()
    {
        global $ID;
        if ($this->ns) {
            if ($this->ns == '*') {
                $check = '*';
            } else {
                $check = $this->ns . ':*';
            }
        } else {
            $check = $ID;
        }

        if (isset($this->acl[$check][$this->who])) {
            return $this->acl[$check][$this->who];
        } else {
            return null;
        }
    }

    /**
     * adds new acl-entry to conf/acl.auth.php
     *
     * @author  Frank Schubert <frank@schokilade.de>
     */
    public function addOrUpdateACL($acl_scope, $acl_user, $acl_level)
    {
        global $config_cascade;

        // first make sure we won't end up with 2 lines matching this user and scope. See issue #1115
        $this->deleteACL($acl_scope, $acl_user);
        $acl_user = auth_nameencode($acl_user, true);

        // max level for pagenames is edit
        if (!str_contains($acl_scope, '*')) {
            if ($acl_level > AUTH_EDIT) $acl_level = AUTH_EDIT;
        }

        $new_acl = "$acl_scope\t$acl_user\t$acl_level\n";

        return io_saveFile($config_cascade['acl']['default'], $new_acl, true);
    }

    /**
     * remove acl-entry from conf/acl.auth.php
     *
     * @author  Frank Schubert <frank@schokilade.de>
     */
    public function deleteACL($acl_scope, $acl_user)
    {
        global $config_cascade;
        $acl_user = auth_nameencode($acl_user, true);

        $acl_pattern = '^' . preg_quote($acl_scope, '/') . '[ \t]+' . $acl_user . '[ \t]+[0-8].*$';

        return io_deleteFromFile($config_cascade['acl']['default'], "/$acl_pattern/", true);
    }

    /**
     * print the permission radio boxes
     *
     * @author  Frank Schubert <frank@schokilade.de>
     * @author  Andreas Gohr <andi@splitbrain.org>
     */
    protected function makeCheckboxes($setperm, $ispage, $name)
    {
        global $lang;

        static $label = 0; //number labels
        $ret = '';

        if ($ispage && $setperm > AUTH_EDIT) $setperm = AUTH_EDIT;

        foreach ([AUTH_NONE, AUTH_READ, AUTH_EDIT, AUTH_CREATE, AUTH_UPLOAD, AUTH_DELETE] as $perm) {
            ++$label;

            //general checkbox attributes
            $atts = [
                'type' => 'radio',
                'id' => 'pbox' . $label,
                'name' => $name,
                'value' => $perm
            ];
            //dynamic attributes
            if (!is_null($setperm) && $setperm == $perm) $atts['checked'] = 'checked';
            if ($ispage && $perm > AUTH_EDIT) {
                $atts['disabled'] = 'disabled';
                $class = ' class="disabled"';
            } else {
                $class = '';
            }

            //build code
            $ret .= '<label for="pbox' . $label . '"' . $class . '>';
            $ret .= '<input ' . buildAttributes($atts) . ' />&#160;';
            $ret .= $this->getLang('acl_perm' . $perm);
            $ret .= '</label>';
        }
        return $ret;
    }

    /**
     * Print a user/group selector (reusing already used users and groups)
     *
     * @author  Andreas Gohr <andi@splitbrain.org>
     */
    protected function makeSelect()
    {
        $inlist = false;
        $usel = '';
        $gsel = '';

        if (
            $this->who &&
            !in_array($this->who, $this->usersgroups) &&
            !in_array($this->who, $this->specials)
        ) {
            if ($this->who[0] == '@') {
                $gsel = ' selected="selected"';
            } else {
                $usel = ' selected="selected"';
            }
        } else {
            $inlist = true;
        }

        echo '<select name="acl_t" class="edit">';
        echo '  <option value="__g__" class="aclgroup"' . $gsel . '>' . $this->getLang('acl_group') . '</option>';
        echo '  <option value="__u__"  class="acluser"' . $usel . '>' . $this->getLang('acl_user') . '</option>';
        if (!empty($this->specials)) {
            echo '  <optgroup label="&#160;">';
            foreach ($this->specials as $ug) {
                if ($ug == $this->who) {
                    $sel = ' selected="selected"';
                    $inlist = true;
                } else {
                    $sel = '';
                }

                if ($ug[0] == '@') {
                    echo '  <option value="' . hsc($ug) . '" class="aclgroup"' . $sel . '>' . hsc($ug) . '</option>';
                } else {
                    echo '  <option value="' . hsc($ug) . '" class="acluser"' . $sel . '>' . hsc($ug) . '</option>';
                }
            }
            echo '  </optgroup>';
        }
        if (!empty($this->usersgroups)) {
            echo '  <optgroup label="&#160;">';
            foreach ($this->usersgroups as $ug) {
                if ($ug == $this->who) {
                    $sel = ' selected="selected"';
                    $inlist = true;
                } else {
                    $sel = '';
                }

                if ($ug[0] == '@') {
                    echo '  <option value="' . hsc($ug) . '" class="aclgroup"' . $sel . '>' . hsc($ug) . '</option>';
                } else {
                    echo '  <option value="' . hsc($ug) . '" class="acluser"' . $sel . '>' . hsc($ug) . '</option>';
                }
            }
            echo '  </optgroup>';
        }
        echo '</select>';
        return $inlist;
    }
}
