xref: /dokuwiki/lib/plugins/usermanager/admin.php (revision ae1afd2f6529e4d07b18317304e5e2c302d783ce)

<?php
/*
 *  User Manager
 *
 *  Dokuwiki Admin Plugin
 *
 *  This version of the user manager has been modified to only work with
 *  objectified version of auth system
 *
 *  @author  neolao <neolao@neolao.com>
 *  @author  Chris Smith <chris@jalakai.co.uk>
 */
// must be run within Dokuwiki
if(!defined('DOKU_INC')) die();

if(!defined('DOKU_PLUGIN_IMAGES')) define('DOKU_PLUGIN_IMAGES',DOKU_BASE.'lib/plugins/usermanager/images/');

/**
 * All DokuWiki plugins to extend the admin function
 * need to inherit from this class
 */
class admin_plugin_usermanager extends DokuWiki_Admin_Plugin {

    var $_auth = null;        // auth object
    var $_user_total = 0;     // number of registered users
    var $_filter = array();   // user selection filter(s)
    var $_start = 0;          // index of first user to be displayed
    var $_last = 0;           // index of the last user to be displayed
    var $_pagesize = 20;      // number of users to list on one page
    var $_edit_user = '';     // set to user selected for editing
    var $_edit_userdata = array();
    var $_disabled = '';      // if disabled set to explanatory string
    var $_import_failures = array();

    /**
     * Constructor
     */
    function admin_plugin_usermanager(){
        global $auth;

        $this->setupLocale();

        if (!isset($auth)) {
          $this->disabled = $this->lang['noauth'];
        } else if (!$auth->canDo('getUsers')) {
          $this->disabled = $this->lang['nosupport'];
        } else {

          // we're good to go
          $this->_auth = & $auth;

        }

        // attempt to retrieve any import failures from the session
        if ($_SESSION['import_failures']){
            $this->_import_failures = $_SESSION['import_failures'];
        }
    }

     /**
     * return prompt for admin menu
     */
    function getMenuText($language) {

        if (!is_null($this->_auth))
          return parent::getMenuText($language);

        return $this->getLang('menu').' '.$this->disabled;
    }

    /**
     * return sort order for position in admin menu
     */
    function getMenuSort() {
        return 2;
    }

    /**
     * handle user request
     */
    function handle() {
        global $INPUT;
        if (is_null($this->_auth)) return false;

        // extract the command and any specific parameters
        // submit button name is of the form - fn[cmd][param(s)]
        $fn   = $INPUT->param('fn');

        if (is_array($fn)) {
            $cmd = key($fn);
            $param = is_array($fn[$cmd]) ? key($fn[$cmd]) : null;
        } else {
            $cmd = $fn;
            $param = null;
        }

        if ($cmd != "search") {
          $this->_start = $INPUT->int('start', 0);
          $this->_filter = $this->_retrieveFilter();
        }

        switch($cmd){
          case "add"    : $this->_addUser(); break;
          case "delete" : $this->_deleteUser(); break;
          case "modify" : $this->_modifyUser(); break;
          case "edit"   : $this->_editUser($param); break;
          case "search" : $this->_setFilter($param);
                          $this->_start = 0;
                          break;
          case "export" : $this->_export(); break;
          case "import" : $this->_import(); break;
          case "importfails" : $this->_downloadImportFailures(); break;
        }

        $this->_user_total = $this->_auth->canDo('getUserCount') ? $this->_auth->getUserCount($this->_filter) : -1;

        // page handling
        switch($cmd){
          case 'start' : $this->_start = 0; break;
          case 'prev'  : $this->_start -= $this->_pagesize; break;
          case 'next'  : $this->_start += $this->_pagesize; break;
          case 'last'  : $this->_start = $this->_user_total; break;
        }
        $this->_validatePagination();
    }

    /**
     * output appropriate html
     */
    function html() {
        global $ID;

        if(is_null($this->_auth)) {
            print $this->lang['badauth'];
            return false;
        }

        $user_list = $this->_auth->retrieveUsers($this->_start, $this->_pagesize, $this->_filter);
        $users = array_keys($user_list);

        $page_buttons = $this->_pagination();
        $delete_disable = $this->_auth->canDo('delUser') ? '' : 'disabled="disabled"';

        $editable = $this->_auth->canDo('UserMod');
        $export_label = empty($this->_filter) ? $this->lang['export_all'] : $this->lang[export_filtered];

        print $this->locale_xhtml('intro');
        print $this->locale_xhtml('list');

        ptln("<div id=\"user__manager\">");
        ptln("<div class=\"level2\">");

        if ($this->_user_total > 0) {
          ptln("<p>".sprintf($this->lang['summary'],$this->_start+1,$this->_last,$this->_user_total,$this->_auth->getUserCount())."</p>");
        } else {
          ptln("<p>".sprintf($this->lang['nonefound'],$this->_auth->getUserCount())."</p>");
        }
        ptln("<form action=\"".wl($ID)."\" method=\"post\">");
        formSecurityToken();
        ptln("  <div class=\"table\">");
        ptln("  <table class=\"inline\">");
        ptln("    <thead>");
        ptln("      <tr>");
        ptln("        <th>&#160;</th><th>".$this->lang["user_id"]."</th><th>".$this->lang["user_name"]."</th><th>".$this->lang["user_mail"]."</th><th>".$this->lang["user_groups"]."</th>");
        ptln("      </tr>");

        ptln("      <tr>");
        ptln("        <td class=\"rightalign\"><input type=\"image\" src=\"".DOKU_PLUGIN_IMAGES."search.png\" name=\"fn[search][new]\" title=\"".$this->lang['search_prompt']."\" alt=\"".$this->lang['search']."\" class=\"button\" /></td>");
        ptln("        <td><input type=\"text\" name=\"userid\" class=\"edit\" value=\"".$this->_htmlFilter('user')."\" /></td>");
        ptln("        <td><input type=\"text\" name=\"username\" class=\"edit\" value=\"".$this->_htmlFilter('name')."\" /></td>");
        ptln("        <td><input type=\"text\" name=\"usermail\" class=\"edit\" value=\"".$this->_htmlFilter('mail')."\" /></td>");
        ptln("        <td><input type=\"text\" name=\"usergroups\" class=\"edit\" value=\"".$this->_htmlFilter('grps')."\" /></td>");
        ptln("      </tr>");
        ptln("    </thead>");

        if ($this->_user_total) {
          ptln("    <tbody>");
          foreach ($user_list as $user => $userinfo) {
            extract($userinfo);
            $groups = join(', ',$grps);
            ptln("    <tr class=\"user_info\">");
            ptln("      <td class=\"centeralign\"><input type=\"checkbox\" name=\"delete[".$user."]\" ".$delete_disable." /></td>");
            if ($editable) {
              ptln("    <td><a href=\"".wl($ID,array('fn[edit]['.hsc($user).']' => 1,
                                                     'do' => 'admin',
                                                     'page' => 'usermanager',
                                                     'sectok' => getSecurityToken())).
                   "\" title=\"".$this->lang['edit_prompt']."\">".hsc($user)."</a></td>");
            } else {
              ptln("    <td>".hsc($user)."</td>");
            }
            ptln("      <td>".hsc($name)."</td><td>".hsc($mail)."</td><td>".hsc($groups)."</td>");
            ptln("    </tr>");
          }
          ptln("    </tbody>");
        }

        ptln("    <tbody>");
        ptln("      <tr><td colspan=\"5\" class=\"centeralign\">");
        ptln("        <span class=\"medialeft\">");
        ptln("          <input type=\"submit\" name=\"fn[delete]\" ".$delete_disable." class=\"button\" value=\"".$this->lang['delete_selected']."\" id=\"usrmgr__del\" />");
        ptln("        </span>");
        ptln("        <span class=\"mediaright\">");
        ptln("          <input type=\"submit\" name=\"fn[start]\" ".$page_buttons['start']." class=\"button\" value=\"".$this->lang['start']."\" />");
        ptln("          <input type=\"submit\" name=\"fn[prev]\" ".$page_buttons['prev']." class=\"button\" value=\"".$this->lang['prev']."\" />");
        ptln("          <input type=\"submit\" name=\"fn[next]\" ".$page_buttons['next']." class=\"button\" value=\"".$this->lang['next']."\" />");
        ptln("          <input type=\"submit\" name=\"fn[last]\" ".$page_buttons['last']." class=\"button\" value=\"".$this->lang['last']."\" />");
        ptln("        </span>");
        if (!empty($this->_filter)) {
            ptln("    <input type=\"submit\" name=\"fn[search][clear]\" class=\"button\" value=\"".$this->lang['clear']."\" />");
        }
        ptln("        <input type=\"submit\" name=\"fn[export]\" class=\"button\" value=\"".$export_label."\" />");
        ptln("        <input type=\"hidden\" name=\"do\"    value=\"admin\" />");
        ptln("        <input type=\"hidden\" name=\"page\"  value=\"usermanager\" />");

        $this->_htmlFilterSettings(2);

        ptln("      </td></tr>");
        ptln("    </tbody>");
        ptln("  </table>");
        ptln("  </div>");

        ptln("</form>");
        ptln("</div>");

        $style = $this->_edit_user ? " class=\"edit_user\"" : "";

        if ($this->_auth->canDo('addUser')) {
          ptln("<div".$style.">");
          print $this->locale_xhtml('add');
          ptln("  <div class=\"level2\">");

          $this->_htmlUserForm('add',null,array(),4);

          ptln("  </div>");
          ptln("</div>");
        }

        if($this->_edit_user  && $this->_auth->canDo('UserMod')){
          ptln("<div".$style." id=\"scroll__here\">");
          print $this->locale_xhtml('edit');
          ptln("  <div class=\"level2\">");

          $this->_htmlUserForm('modify',$this->_edit_user,$this->_edit_userdata,4);

          ptln("  </div>");
          ptln("</div>");
        }

        if ($this->_auth->canDo('addUser')) {
          $this->_htmlImportForm();
        }
        ptln("</div>");
    }


    /**
     * @todo disable fields which the backend can't change
     */
    function _htmlUserForm($cmd,$user='',$userdata=array(),$indent=0) {
        global $conf;
        global $ID;

        $name = $mail = $groups = '';
        $notes = array();

        if ($user) {
          extract($userdata);
          if (!empty($grps)) $groups = join(',',$grps);
        } else {
          $notes[] = sprintf($this->lang['note_group'],$conf['defaultgroup']);
        }

        ptln("<form action=\"".wl($ID)."\" method=\"post\">",$indent);
        formSecurityToken();
        ptln("  <div class=\"table\">",$indent);
        ptln("  <table class=\"inline\">",$indent);
        ptln("    <thead>",$indent);
        ptln("      <tr><th>".$this->lang["field"]."</th><th>".$this->lang["value"]."</th></tr>",$indent);
        ptln("    </thead>",$indent);
        ptln("    <tbody>",$indent);

        $this->_htmlInputField($cmd."_userid",    "userid",    $this->lang["user_id"],    $user,  $this->_auth->canDo("modLogin"), $indent+6);
        $this->_htmlInputField($cmd."_userpass",  "userpass",  $this->lang["user_pass"],  "",     $this->_auth->canDo("modPass"),  $indent+6);
        $this->_htmlInputField($cmd."_username",  "username",  $this->lang["user_name"],  $name,  $this->_auth->canDo("modName"),  $indent+6);
        $this->_htmlInputField($cmd."_usermail",  "usermail",  $this->lang["user_mail"],  $mail,  $this->_auth->canDo("modMail"),  $indent+6);
        $this->_htmlInputField($cmd."_usergroups","usergroups",$this->lang["user_groups"],$groups,$this->_auth->canDo("modGroups"),$indent+6);

        if ($this->_auth->canDo("modPass")) {
          $notes[] = $this->lang['note_pass'];
          if ($user) {
            $notes[] = $this->lang['note_notify'];
          }

          ptln("<tr><td><label for=\"".$cmd."_usernotify\" >".$this->lang["user_notify"].": </label></td><td><input type=\"checkbox\" id=\"".$cmd."_usernotify\" name=\"usernotify\" value=\"1\" /></td></tr>", $indent);
        }

        ptln("    </tbody>",$indent);
        ptln("    <tbody>",$indent);
        ptln("      <tr>",$indent);
        ptln("        <td colspan=\"2\">",$indent);
        ptln("          <input type=\"hidden\" name=\"do\"    value=\"admin\" />",$indent);
        ptln("          <input type=\"hidden\" name=\"page\"  value=\"usermanager\" />",$indent);

        // save current $user, we need this to access details if the name is changed
        if ($user)
          ptln("          <input type=\"hidden\" name=\"userid_old\"  value=\"".$user."\" />",$indent);

        $this->_htmlFilterSettings($indent+10);

        ptln("          <input type=\"submit\" name=\"fn[".$cmd."]\" class=\"button\" value=\"".$this->lang[$cmd]."\" />",$indent);
        ptln("        </td>",$indent);
        ptln("      </tr>",$indent);
        ptln("    </tbody>",$indent);
        ptln("  </table>",$indent);
        ptln("  </div>",$indent);

        foreach ($notes as $note)
          ptln("<div class=\"fn\">".$note."</div>",$indent);

        ptln("</form>",$indent);
    }

    function _htmlInputField($id, $name, $label, $value, $cando, $indent=0) {
        $class = $cando ? '' : ' class="disabled"';
        echo str_pad('',$indent);

        if($name == 'userpass'){
            $fieldtype = 'password';
            $autocomp  = 'autocomplete="off"';
        }elseif($name == 'usermail'){
            $fieldtype = 'email';
            $autocomp  = '';
        }else{
            $fieldtype = 'text';
            $autocomp  = '';
        }


        echo "<tr $class>";
        echo "<td><label for=\"$id\" >$label: </label></td>";
        echo "<td>";
        if($cando){
            echo "<input type=\"$fieldtype\" id=\"$id\" name=\"$name\" value=\"$value\" class=\"edit\" $autocomp />";
        }else{
            echo "<input type=\"hidden\" name=\"$name\" value=\"$value\" />";
            echo "<input type=\"$fieldtype\" id=\"$id\" name=\"$name\" value=\"$value\" class=\"edit disabled\" disabled=\"disabled\" />";
        }
        echo "</td>";
        echo "</tr>";
    }

    function _htmlFilter($key) {
        if (empty($this->_filter)) return '';
        return (isset($this->_filter[$key]) ? hsc($this->_filter[$key]) : '');
    }

    function _htmlFilterSettings($indent=0) {

        ptln("<input type=\"hidden\" name=\"start\" value=\"".$this->_start."\" />",$indent);

        foreach ($this->_filter as $key => $filter) {
          ptln("<input type=\"hidden\" name=\"filter[".$key."]\" value=\"".hsc($filter)."\" />",$indent);
        }
    }

    function _htmlImportForm($indent=0) {
        global $ID;

        $failure_download_link = wl($ID,array('do'=>'admin','page'=>'usermanager','fn[importfails]'=>1));

        ptln('<div class="level2 import_users">',$indent);
        print $this->locale_xhtml('import');
        ptln('  <form action="'.wl($ID).'" method="post" enctype="multipart/form-data">',$indent);
        formSecurityToken();
        ptln('    <label>User list file (csv):  <input type="file" name="import" /></label>',$indent);
        ptln('    <input type="submit" name="fn[import]" value="'.$this->lang['import'].'" />',$indent);
        ptln('    <input type="hidden" name="do"    value="admin" />',$indent);
        ptln('    <input type="hidden" name="page"  value="usermanager" />',$indent);

        $this->_htmlFilterSettings($indent+4);
        ptln('  </form>',$indent);
        ptln('</div>');

        // list failures from the previous import
        if ($this->_import_failures) {
            $digits = strlen(count($this->_import_failures));
            ptln('<div class="level3 import_failures">',$indent);
            ptln('  <h3>Most Recent Import - Failures</h3>');
            ptln('  <table class="import_failures">',$indent);
            ptln('    <thead>',$indent);
            ptln('      <tr>',$indent);
            ptln('        <th class="line">'.$this->lang['line'].'</th>',$indent);
            ptln('        <th class="error">'.$this->lang['error'].'</th>',$indent);
            ptln('        <th class="userid">'.$this->lang['user_id'].'</th>',$indent);
            ptln('        <th class="username">'.$this->lang['user_name'].'</th>',$indent);
            ptln('        <th class="usermail">'.$this->lang['user_mail'].'</th>',$indent);
            ptln('        <th class="usergroups">'.$this->lang['user_groups'].'</th>',$indent);
            ptln('      </tr>',$indent);
            ptln('    </thead>',$indent);
            ptln('    <tbody>',$indent);
            foreach ($this->_import_failures as $line => $failure) {
                ptln('      <tr>',$indent);
                ptln('        <td class="lineno"> '.sprintf('%0'.$digits.'d',$line).' </td>',$indent);
                ptln('        <td class="error">' .$failure['error'].' </td>', $indent);
                ptln('        <td class="field userid"> '.hsc($failure['user'][0]).' </td>',$indent);
                ptln('        <td class="field username"> '.hsc($failure['user'][2]).' </td>',$indent);
                ptln('        <td class="field usermail"> '.hsc($failure['user'][3]).' </td>',$indent);
                ptln('        <td class="field usergroups"> '.hsc($failure['user'][4]).' </td>',$indent);
                ptln('      </tr>',$indent);
            }
            ptln('    </tbody>',$indent);
            ptln('  </table>',$indent);
            ptln('  <p><a href="'.$failure_download_link.'">Download Failures as CSV for correction</a></p>');
            ptln('</div>');
        }

    }

    function _addUser(){
        global $INPUT;
        if (!checkSecurityToken()) return false;
        if (!$this->_auth->canDo('addUser')) return false;

        list($user,$pass,$name,$mail,$grps) = $this->_retrieveUser();
        if (empty($user)) return false;

        if ($this->_auth->canDo('modPass')){
          if (empty($pass)){
            if($INPUT->has('usernotify')){
              $pass = auth_pwgen($user);
            } else {
              msg($this->lang['add_fail'], -1);
              return false;
            }
          }
        } else {
          if (!empty($pass)){
            msg($this->lang['add_fail'], -1);
            return false;
          }
        }

        if ($this->_auth->canDo('modName')){
          if (empty($name)){
            msg($this->lang['add_fail'], -1);
            return false;
          }
        } else {
          if (!empty($name)){
            return false;
          }
        }

        if ($this->_auth->canDo('modMail')){
          if (empty($mail)){
            msg($this->lang['add_fail'], -1);
            return false;
          }
        } else {
          if (!empty($mail)){
            return false;
          }
        }

        if ($ok = $this->_auth->triggerUserMod('create', array($user,$pass,$name,$mail,$grps))) {

          msg($this->lang['add_ok'], 1);

          if ($INPUT->has('usernotify') && $pass) {
            $this->_notifyUser($user,$pass);
          }
        } else {
          msg($this->lang['add_fail'], -1);
        }

        return $ok;
    }

    /**
     * Delete user
     */
    function _deleteUser(){
        global $conf, $INPUT;

        if (!checkSecurityToken()) return false;
        if (!$this->_auth->canDo('delUser')) return false;

        $selected = $INPUT->arr('delete');
        if (empty($selected)) return false;
        $selected = array_keys($selected);

        if(in_array($_SERVER['REMOTE_USER'], $selected)) {
            msg("You can't delete yourself!", -1);
            return false;
        }

        $count = $this->_auth->triggerUserMod('delete', array($selected));
        if ($count == count($selected)) {
          $text = str_replace('%d', $count, $this->lang['delete_ok']);
          msg("$text.", 1);
        } else {
          $part1 = str_replace('%d', $count, $this->lang['delete_ok']);
          $part2 = str_replace('%d', (count($selected)-$count), $this->lang['delete_fail']);
          msg("$part1, $part2",-1);
        }

        // invalidate all sessions
        io_saveFile($conf['cachedir'].'/sessionpurge',time());

        return true;
    }

    /**
     * Edit user (a user has been selected for editing)
     */
    function _editUser($param) {
        if (!checkSecurityToken()) return false;
        if (!$this->_auth->canDo('UserMod')) return false;

        $user = cleanID(preg_replace('/.*:/','',$param));
        $userdata = $this->_auth->getUserData($user);

        // no user found?
        if (!$userdata) {
          msg($this->lang['edit_usermissing'],-1);
          return false;
        }

        $this->_edit_user = $user;
        $this->_edit_userdata = $userdata;

        return true;
    }

    /**
     * Modify user (modified user data has been recieved)
     */
    function _modifyUser(){
        global $conf, $INPUT;

        if (!checkSecurityToken()) return false;
        if (!$this->_auth->canDo('UserMod')) return false;

        // get currently valid  user data
        $olduser = cleanID(preg_replace('/.*:/','',$INPUT->str('userid_old')));
        $oldinfo = $this->_auth->getUserData($olduser);

        // get new user data subject to change
        list($newuser,$newpass,$newname,$newmail,$newgrps) = $this->_retrieveUser();
        if (empty($newuser)) return false;

        $changes = array();
        if ($newuser != $olduser) {

          if (!$this->_auth->canDo('modLogin')) {        // sanity check, shouldn't be possible
            msg($this->lang['update_fail'],-1);
            return false;
          }

          // check if $newuser already exists
          if ($this->_auth->getUserData($newuser)) {
            msg(sprintf($this->lang['update_exists'],$newuser),-1);
            $re_edit = true;
          } else {
            $changes['user'] = $newuser;
          }
        }

        // generate password if left empty and notification is on
        if($INPUT->has('usernotify') && empty($newpass)){
            $newpass = auth_pwgen($olduser);
        }

        if (!empty($newpass) && $this->_auth->canDo('modPass'))
          $changes['pass'] = $newpass;
        if (!empty($newname) && $this->_auth->canDo('modName') && $newname != $oldinfo['name'])
          $changes['name'] = $newname;
        if (!empty($newmail) && $this->_auth->canDo('modMail') && $newmail != $oldinfo['mail'])
          $changes['mail'] = $newmail;
        if (!empty($newgrps) && $this->_auth->canDo('modGroups') && $newgrps != $oldinfo['grps'])
          $changes['grps'] = $newgrps;

        if ($ok = $this->_auth->triggerUserMod('modify', array($olduser, $changes))) {
          msg($this->lang['update_ok'],1);

          if ($INPUT->has('usernotify') && $newpass) {
            $notify = empty($changes['user']) ? $olduser : $newuser;
            $this->_notifyUser($notify,$newpass);
          }

          // invalidate all sessions
          io_saveFile($conf['cachedir'].'/sessionpurge',time());

        } else {
          msg($this->lang['update_fail'],-1);
        }

        if (!empty($re_edit)) {
            $this->_editUser($olduser);
        }

        return $ok;
    }

    /**
     * send password change notification email
     */
    function _notifyUser($user, $password) {

        if ($sent = auth_sendPassword($user,$password)) {
          msg($this->lang['notify_ok'], 1);
        } else {
          msg($this->lang['notify_fail'], -1);
        }

        return $sent;
    }

    /**
     * retrieve & clean user data from the form
     *
     * @return array (user, password, full name, email, array(groups))
     */
    function _retrieveUser($clean=true) {
        global $auth;
        global $INPUT;

        $user[0] = ($clean) ? $auth->cleanUser($INPUT->str('userid')) : $INPUT->str('userid');
        $user[1] = $INPUT->str('userpass');
        $user[2] = $INPUT->str('username');
        $user[3] = $INPUT->str('usermail');
        $user[4] = explode(',',$INPUT->str('usergroups'));

        $user[4] = array_map('trim',$user[4]);
        if($clean) $user[4] = array_map(array($auth,'cleanGroup'),$user[4]);
        $user[4] = array_filter($user[4]);
        $user[4] = array_unique($user[4]);
        if(!count($user[4])) $user[4] = null;

        return $user;
    }

    function _setFilter($op) {

        $this->_filter = array();

        if ($op == 'new') {
          list($user,$pass,$name,$mail,$grps) = $this->_retrieveUser(false);

          if (!empty($user)) $this->_filter['user'] = $user;
          if (!empty($name)) $this->_filter['name'] = $name;
          if (!empty($mail)) $this->_filter['mail'] = $mail;
          if (!empty($grps)) $this->_filter['grps'] = join('|',$grps);
        }
    }

    function _retrieveFilter() {
        global $INPUT;

        $t_filter = $INPUT->arr('filter');

        // messy, but this way we ensure we aren't getting any additional crap from malicious users
        $filter = array();

        if (isset($t_filter['user'])) $filter['user'] = $t_filter['user'];
        if (isset($t_filter['name'])) $filter['name'] = $t_filter['name'];
        if (isset($t_filter['mail'])) $filter['mail'] = $t_filter['mail'];
        if (isset($t_filter['grps'])) $filter['grps'] = $t_filter['grps'];

        return $filter;
    }

    function _validatePagination() {

        if ($this->_start >= $this->_user_total) {
          $this->_start = $this->_user_total - $this->_pagesize;
        }
        if ($this->_start < 0) $this->_start = 0;

        $this->_last = min($this->_user_total, $this->_start + $this->_pagesize);
    }

    /*
     *  return an array of strings to enable/disable pagination buttons
     */
    function _pagination() {

        $disabled = 'disabled="disabled"';

        $buttons['start'] = $buttons['prev'] = ($this->_start == 0) ? $disabled : '';

        if ($this->_user_total == -1) {
          $buttons['last'] = $disabled;
          $buttons['next'] = '';
        } else {
          $buttons['last'] = $buttons['next'] = (($this->_start + $this->_pagesize) >= $this->_user_total) ? $disabled : '';
        }

        return $buttons;
    }

    /*
     *  export a list of users in csv format using the current filter criteria
     */
    function _export() {
        // list of users for export - based on current filter criteria
        $user_list = $this->_auth->retrieveUsers(0, 0, $this->_filter);
        $column_headings = array(
            $this->lang["user_id"],
            $this->lang["user_name"],
            $this->lang["user_mail"],
            $this->lang["user_groups"]
        );

        // ==============================================================================================
        // GENERATE OUTPUT
        // normal headers for downloading...
        header('Content-type: text/csv;charset=utf-8');
        header('Content-Disposition: attachment; filename="wikiusers.csv"');
#       // for debugging assistance, send as text plain to the browser
#       header('Content-type: text/plain;charset=utf-8');

        // output the csv
        $fd = fopen('php://output','w');
        fputcsv($fd, $column_headings);
        foreach ($user_list as $user => $info) {
            $line = array($user, $info['name'], $info['mail'], join(',',$info['grps']));
            fputcsv($fd, $line);
        }
        fclose($fd);
        die;
    }

    /*
     * import a file of users in csv format
     *
     * csv file should have 4 columns, user_id, full name, email, groups (comma separated)
     */
    function _import() {
        // check we are allowed to add users
        if (!checkSecurityToken()) return false;
        if (!$this->_auth->canDo('addUser')) return false;

        // check file uploaded ok.
        if (empty($_FILES['import']['size']) || !empty($FILES['import']['error']) && is_uploaded_file($FILES['import']['tmp_name'])) {
            msg($this->lang['import_error_upload'],-1);
            return false;
        }
        // retrieve users from the file
        $this->_import_failures = array();
        $import_success_count = 0;
        $import_fail_count = 0;
        $line = 0;
        $fd = fopen($_FILES['import']['tmp_name'],'r');
        if ($fd) {
            while($csv = fgets($fd)){
                $raw = str_getcsv($csv);
                $error = '';                        // clean out any errors from the previous line
                // data checks...
                if (1 == ++$line) {
                    if ($raw[0] == 'user_id' || $raw[0] == $this->lang['user_id']) continue;    // skip headers
                }
                if (count($raw) < 4) {                                        // need at least four fields
                    $import_fail_count++;
                    $error = sprintf($this->lang['import_error_fields'], count($raw));
                    $this->_import_failures[$line] = array('error' => $error, 'user' => $raw, 'orig' => $csv);
                    continue;
                }
                array_splice($raw,1,0,auth_pwgen());                          // splice in a generated password
                $clean = $this->_cleanImportUser($raw, $error);
                if ($clean && $this->_addImportUser($clean, $error)) {
#                    $this->_notifyUser($clean[0],$clean[1]);
                    $import_success_count++;
                } else {
                    $import_fail_count++;
                    $this->_import_failures[$line] = array('error' => $error, 'user' => $raw, 'orig' => $csv);
                }
            }
            msg(sprintf($this->lang['import_success_count'], ($import_success_count+$import_fail_count), $import_success_count),($import_success_count ? 1 : -1));
            if ($import_fail_count) {
                msg(sprintf($this->lang['import_failure_count'], $import_fail_count),-1);
            }
        } else {
            msg($this->lang['import_error_readfail'],-1);
        }

        // save import failures into the session
        if (!headers_sent()) {
          session_start();
          $_SESSION['import_failures'] = $this->_import_failures;
          session_write_close();
        }
    }

    function _cleanImportUser($candidate, & $error){
        global $INPUT;

        // kludgy ....
        $INPUT->set('userid', $candidate[0]);
        $INPUT->set('userpass', $candidate[1]);
        $INPUT->set('username', $candidate[2]);
        $INPUT->set('usermail', $candidate[3]);
        $INPUT->set('usergroups', $candidate[4]);

        $cleaned = $this->_retrieveUser();
        list($user,$pass,$name,$mail,$grps) = $cleaned;
        if (empty($user)) {
            $error = $this->lang['import_error_baduserid'];
            return false;
        }

        // no need to check password, handled elsewhere

        if (!($this->_auth->canDo('modName') xor empty($name))){
            $error = $this->lang['import_error_badname'];
            return false;
        }

        if (!($this->_auth->canDo('modMail') xor empty($mail))){
            $error = $this->lang['import_error_badmail'];
            return false;
        }

        return $cleaned;
    }

    function _addImportUser($user, & $error){
        if (!$this->_auth->triggerUserMod('create', $user)) {
            $error = $this->lang['import_error_create'];
            return false;
        }

        return true;
    }

    function _downloadImportFailures(){

        // ==============================================================================================
        // GENERATE OUTPUT
        // normal headers for downloading...
        header('Content-type: text/csv;charset=utf-8');
        header('Content-Disposition: attachment; filename="importfails.csv"');
#       // for debugging assistance, send as text plain to the browser
#       header('Content-type: text/plain;charset=utf-8');

        // output the csv
        $fd = fopen('php://output','w');
        foreach ($this->_import_failures as $line => $fail) {
            fputs($fd, $fail['orig']);
        }
        fclose($fd);
        die;
    }

}