includes/specials/SpecialUserrights.php

   1 <?php
   2 /**
   3  * Implements Special:Userrights
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Special page to allow managing user group membership
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class UserrightsPage extends SpecialPage {
  30         # The target of the local right-adjuster's interest.  Can be gotten from
  31         # either a GET parameter or a subpage-style parameter, so have a member
  32         # variable for it.
  33         protected $mTarget;
  34         protected $isself = false;
  35
  36         public function __construct() {
  37                 parent::__construct( 'Userrights' );
  38         }
  39
  40         public function isRestricted() {
  41                 return true;
  42         }
  43
  44         public function userCanExecute( User $user ) {
  45                 return $this->userCanChangeRights( $user, false );
  46         }
  47
  48         /**
  49          * @param User $user
  50          * @param bool $checkIfSelf
  51          * @return bool
  52          */
  53         public function userCanChangeRights( $user, $checkIfSelf = true ) {
  54                 $available = $this->changeableGroups();
  55                 if ( $user->getId() == 0 ) {
  56                         return false;
  57                 }
  58                 return !empty( $available['add'] )
  59                         || !empty( $available['remove'] )
  60                         || ( ( $this->isself || !$checkIfSelf ) &&
  61                                 ( !empty( $available['add-self'] )
  62                                         || !empty( $available['remove-self'] ) ) );
  63         }
  64
  65         /**
  66          * Manage forms to be shown according to posted data.
  67          * Depending on the submit button used, call a form or a save function.
  68          *
  69          * @param $par Mixed: string if any subpage provided, else null
  70          * @throws UserBlockedError|PermissionsError
  71          */
  72         public function execute( $par ) {
  73                 // If the visitor doesn't have permissions to assign or remove
  74                 // any groups, it's a bit silly to give them the user search prompt.
  75
  76                 $user = $this->getUser();
  77
  78                 /*
  79                  * If the user is blocked and they only have "partial" access
  80                  * (e.g. they don't have the userrights permission), then don't
  81                  * allow them to use Special:UserRights.
  82                  */
  83                 if ( $user->isBlocked() && !$user->isAllowed( 'userrights' ) ) {
  84                         throw new UserBlockedError( $user->getBlock() );
  85                 }
  86
  87                 $request = $this->getRequest();
  88
  89                 if ( $par !== null ) {
  90                         $this->mTarget = $par;
  91                 } else {
  92                         $this->mTarget = $request->getVal( 'user' );
  93                 }
  94
  95                 $available = $this->changeableGroups();
  96
  97                 if ( $this->mTarget === null ) {
  98                         /*
  99                          * If the user specified no target, and they can only
 100                          * edit their own groups, automatically set them as the
 101                          * target.
 102                          */
 103                         if ( !count( $available['add'] ) && !count( $available['remove'] ) ) {
 104                                 $this->mTarget = $user->getName();
 105                         }
 106                 }
 107
 108                 if ( User::getCanonicalName( $this->mTarget ) == $user->getName() ) {
 109                         $this->isself = true;
 110                 }
 111
 112                 if ( !$this->userCanChangeRights( $user, true ) ) {
 113                         if ( $this->isself && $request->getCheck( 'success' ) ) {
 114                                 // bug 48609: if the user just removed its own rights, this would
 115                                 // leads it in a "permissions error" page. In that case, show a
 116                                 // message that it can't anymore use this page instead of an error
 117                                 $this->setHeaders();
 118                                 $out = $this->getOutput();
 119                                 $out->wrapWikiMsg( "<div class=\"successbox\">\n$1\n</div>", 'userrights-removed-self' );
 120                                 $out->returnToMain();
 121                                 return;
 122                         }
 123
 124                         // @todo FIXME: There may be intermediate groups we can mention.
 125                         $msg = $user->isAnon() ? 'userrights-nologin' : 'userrights-notallowed';
 126                         throw new PermissionsError( null, array( array( $msg ) ) );
 127                 }
 128
 129                 $this->checkReadOnly();
 130
 131                 $this->setHeaders();
 132                 $this->outputHeader();
 133
 134                 $out = $this->getOutput();
 135                 $out->addModuleStyles( 'mediawiki.special' );
 136
 137                 // show the general form
 138                 if ( count( $available['add'] ) || count( $available['remove'] ) ) {
 139                         $this->switchForm();
 140                 }
 141
 142                 if (
 143                         $request->wasPosted() &&
 144                         $request->getCheck( 'saveusergroups' ) &&
 145                         $user->matchEditToken( $request->getVal( 'wpEditToken' ), $this->mTarget )
 146                 ) {
 147                         // save settings
 148                         $status = $this->fetchUser( $this->mTarget );
 149                         if ( !$status->isOK() ) {
 150                                 $this->getOutput()->addWikiText( $status->getWikiText() );
 151                                 return;
 152                         }
 153
 154                         $targetUser = $status->value;
 155                         $targetUser->clearInstanceCache();
 156
 157                         if ( $request->getVal( 'conflictcheck-originalgroups' ) !== implode( ',', $targetUser->getGroups() ) ) {
 158                                 $out->addWikiMsg( 'userrights-conflict' );
 159                         } else {
 160                                 $this->saveUserGroups(
 161                                         $this->mTarget,
 162                                         $request->getVal( 'user-reason' ),
 163                                         $targetUser
 164                                 );
 165
 166                                 $out->redirect( $this->getSuccessURL() );
 167                                 return;
 168                         }
 169                 }
 170
 171                 // show some more forms
 172                 if ( $this->mTarget !== null ) {
 173                         $this->editUserGroupsForm( $this->mTarget );
 174                 }
 175         }
 176
 177         function getSuccessURL() {
 178                 return $this->getPageTitle( $this->mTarget )->getFullURL( array( 'success' => 1 ) );
 179         }
 180
 181         /**
 182          * Save user groups changes in the database.
 183          * Data comes from the editUserGroupsForm() form function
 184          *
 185          * @param string $username username to apply changes to.
 186          * @param string $reason reason for group change
 187          * @param User|UserRightsProxy $user Target user object.
 188          * @return null
 189          */
 190         function saveUserGroups( $username, $reason, $user ) {
 191                 $allgroups = $this->getAllGroups();
 192                 $addgroup = array();
 193                 $removegroup = array();
 194
 195                 // This could possibly create a highly unlikely race condition if permissions are changed between
 196                 //  when the form is loaded and when the form is saved. Ignoring it for the moment.
 197                 foreach ( $allgroups as $group ) {
 198                         // We'll tell it to remove all unchecked groups, and add all checked groups.
 199                         // Later on, this gets filtered for what can actually be removed
 200                         if ( $this->getRequest()->getCheck( "wpGroup-$group" ) ) {
 201                                 $addgroup[] = $group;
 202                         } else {
 203                                 $removegroup[] = $group;
 204                         }
 205                 }
 206
 207                 $this->doSaveUserGroups( $user, $addgroup, $removegroup, $reason );
 208         }
 209
 210         /**
 211          * Save user groups changes in the database.
 212          *
 213          * @param $user User object
 214          * @param array $add of groups to add
 215          * @param array $remove of groups to remove
 216          * @param string $reason reason for group change
 217          * @return Array: Tuple of added, then removed groups
 218          */
 219         function doSaveUserGroups( $user, $add, $remove, $reason = '' ) {
 220                 global $wgAuth;
 221
 222                 // Validate input set...
 223                 $isself = ( $user->getName() == $this->getUser()->getName() );
 224                 $groups = $user->getGroups();
 225                 $changeable = $this->changeableGroups();
 226                 $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : array() );
 227                 $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : array() );
 228
 229                 $remove = array_unique(
 230                         array_intersect( (array)$remove, $removable, $groups ) );
 231                 $add = array_unique( array_diff(
 232                         array_intersect( (array)$add, $addable ),
 233                         $groups )
 234                 );
 235
 236                 $oldGroups = $user->getGroups();
 237                 $newGroups = $oldGroups;
 238
 239                 // remove then add groups
 240                 if ( $remove ) {
 241                         $newGroups = array_diff( $newGroups, $remove );
 242                         foreach ( $remove as $group ) {
 243                                 $user->removeGroup( $group );
 244                         }
 245                 }
 246                 if ( $add ) {
 247                         $newGroups = array_merge( $newGroups, $add );
 248                         foreach ( $add as $group ) {
 249                                 $user->addGroup( $group );
 250                         }
 251                 }
 252                 $newGroups = array_unique( $newGroups );
 253
 254                 // Ensure that caches are cleared
 255                 $user->invalidateCache();
 256
 257                 // update groups in external authentication database
 258                 $wgAuth->updateExternalDBGroups( $user, $add, $remove );
 259
 260                 wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) );
 261                 wfDebug( 'newGroups: ' . print_r( $newGroups, true ) );
 262                 wfRunHooks( 'UserRights', array( &$user, $add, $remove ) );
 263
 264                 if ( $newGroups != $oldGroups ) {
 265                         $this->addLogEntry( $user, $oldGroups, $newGroups, $reason );
 266                 }
 267                 return array( $add, $remove );
 268         }
 269
 270         /**
 271          * Add a rights log entry for an action.
 272          */
 273         function addLogEntry( $user, $oldGroups, $newGroups, $reason ) {
 274                 $logEntry = new ManualLogEntry( 'rights', 'rights' );
 275                 $logEntry->setPerformer( $this->getUser() );
 276                 $logEntry->setTarget( $user->getUserPage() );
 277                 $logEntry->setComment( $reason );
 278                 $logEntry->setParameters( array(
 279                         '4::oldgroups' => $oldGroups,
 280                         '5::newgroups' => $newGroups,
 281                 ) );
 282                 $logid = $logEntry->insert();
 283                 $logEntry->publish( $logid );
 284         }
 285
 286         /**
 287          * Edit user groups membership
 288          * @param string $username name of the user.
 289          */
 290         function editUserGroupsForm( $username ) {
 291                 $status = $this->fetchUser( $username );
 292                 if ( !$status->isOK() ) {
 293                         $this->getOutput()->addWikiText( $status->getWikiText() );
 294                         return;
 295                 } else {
 296                         $user = $status->value;
 297                 }
 298
 299                 $groups = $user->getGroups();
 300
 301                 $this->showEditUserGroupsForm( $user, $groups );
 302
 303                 // This isn't really ideal logging behavior, but let's not hide the
 304                 // interwiki logs if we're using them as is.
 305                 $this->showLogFragment( $user, $this->getOutput() );
 306         }
 307
 308         /**
 309          * Normalize the input username, which may be local or remote, and
 310          * return a user (or proxy) object for manipulating it.
 311          *
 312          * Side effects: error output for invalid access
 313          * @param string $username
 314          * @return Status object
 315          */
 316         public function fetchUser( $username ) {
 317                 global $wgUserrightsInterwikiDelimiter;
 318
 319                 $parts = explode( $wgUserrightsInterwikiDelimiter, $username );
 320                 if ( count( $parts ) < 2 ) {
 321                         $name = trim( $username );
 322                         $database = '';
 323                 } else {
 324                         list( $name, $database ) = array_map( 'trim', $parts );
 325
 326                         if ( $database == wfWikiID() ) {
 327                                 $database = '';
 328                         } else {
 329                                 if ( !$this->getUser()->isAllowed( 'userrights-interwiki' ) ) {
 330                                         return Status::newFatal( 'userrights-no-interwiki' );
 331                                 }
 332                                 if ( !UserRightsProxy::validDatabase( $database ) ) {
 333                                         return Status::newFatal( 'userrights-nodatabase', $database );
 334                                 }
 335                         }
 336                 }
 337
 338                 if ( $name === '' ) {
 339                         return Status::newFatal( 'nouserspecified' );
 340                 }
 341
 342                 if ( $name[0] == '#' ) {
 343                         // Numeric ID can be specified...
 344                         // We'll do a lookup for the name internally.
 345                         $id = intval( substr( $name, 1 ) );
 346
 347                         if ( $database == '' ) {
 348                                 $name = User::whoIs( $id );
 349                         } else {
 350                                 $name = UserRightsProxy::whoIs( $database, $id );
 351                         }
 352
 353                         if ( !$name ) {
 354                                 return Status::newFatal( 'noname' );
 355                         }
 356                 } else {
 357                         $name = User::getCanonicalName( $name );
 358                         if ( $name === false ) {
 359                                 // invalid name
 360                                 return Status::newFatal( 'nosuchusershort', $username );
 361                         }
 362                 }
 363
 364                 if ( $database == '' ) {
 365                         $user = User::newFromName( $name );
 366                 } else {
 367                         $user = UserRightsProxy::newFromName( $database, $name );
 368                 }
 369
 370                 if ( !$user || $user->isAnon() ) {
 371                         return Status::newFatal( 'nosuchusershort', $username );
 372                 }
 373
 374                 return Status::newGood( $user );
 375         }
 376
 377         function makeGroupNameList( $ids ) {
 378                 if ( empty( $ids ) ) {
 379                         return $this->msg( 'rightsnone' )->inContentLanguage()->text();
 380                 } else {
 381                         return implode( ', ', $ids );
 382                 }
 383         }
 384
 385         /**
 386          * Make a list of group names to be stored as parameter for log entries
 387          *
 388          * @deprecated in 1.21; use LogFormatter instead.
 389          * @param $ids array
 390          * @return string
 391          */
 392         function makeGroupNameListForLog( $ids ) {
 393                 wfDeprecated( __METHOD__, '1.21' );
 394
 395                 if ( empty( $ids ) ) {
 396                         return '';
 397                 } else {
 398                         return $this->makeGroupNameList( $ids );
 399                 }
 400         }
 401
 402         /**
 403          * Output a form to allow searching for a user
 404          */
 405         function switchForm() {
 406                 global $wgScript;
 407                 $this->getOutput()->addHTML(
 408                         Html::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript, 'name' => 'uluser', 'id' => 'mw-userrights-form1' ) ) .
 409                         Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
 410                         Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
 411                         Xml::inputLabel( $this->msg( 'userrights-user-editname' )->text(), 'user', 'username', 30, str_replace( '_', ' ', $this->mTarget ), array( 'autofocus' => true ) ) . ' ' .
 412                         Xml::submitButton( $this->msg( 'editusergroup' )->text() ) .
 413                         Html::closeElement( 'fieldset' ) .
 414                         Html::closeElement( 'form' ) . "\n"
 415                 );
 416         }
 417
 418         /**
 419          * Go through used and available groups and return the ones that this
 420          * form will be able to manipulate based on the current user's system
 421          * permissions.
 422          *
 423          * @param array $groups list of groups the given user is in
 424          * @return Array:  Tuple of addable, then removable groups
 425          */
 426         protected function splitGroups( $groups ) {
 427                 list( $addable, $removable, $addself, $removeself ) = array_values( $this->changeableGroups() );
 428
 429                 $removable = array_intersect(
 430                         array_merge( $this->isself ? $removeself : array(), $removable ),
 431                         $groups
 432                 ); // Can't remove groups the user doesn't have
 433                 $addable = array_diff(
 434                         array_merge( $this->isself ? $addself : array(), $addable ),
 435                         $groups
 436                 ); // Can't add groups the user does have
 437
 438                 return array( $addable, $removable );
 439         }
 440
 441         /**
 442          * Show the form to edit group memberships.
 443          *
 444          * @param $user      User or UserRightsProxy you're editing
 445          * @param $groups    Array:  Array of groups the user is in
 446          */
 447         protected function showEditUserGroupsForm( $user, $groups ) {
 448                 $list = array();
 449                 $membersList = array();
 450                 foreach ( $groups as $group ) {
 451                         $list[] = self::buildGroupLink( $group );
 452                         $membersList[] = self::buildGroupMemberLink( $group );
 453                 }
 454
 455                 $autoList = array();
 456                 $autoMembersList = array();
 457                 if ( $user instanceof User ) {
 458                         foreach ( Autopromote::getAutopromoteGroups( $user ) as $group ) {
 459                                 $autoList[] = self::buildGroupLink( $group );
 460                                 $autoMembersList[] = self::buildGroupMemberLink( $group );
 461                         }
 462                 }
 463
 464                 $language = $this->getLanguage();
 465                 $displayedList = $this->msg( 'userrights-groupsmember-type',
 466                         $language->listToText( $list ),
 467                         $language->listToText( $membersList )
 468                 )->plain();
 469                 $displayedAutolist = $this->msg( 'userrights-groupsmember-type',
 470                         $language->listToText( $autoList ),
 471                         $language->listToText( $autoMembersList )
 472                 )->plain();
 473
 474                 $grouplist = '';
 475                 $count = count( $list );
 476                 if ( $count > 0 ) {
 477                         $grouplist = $this->msg( 'userrights-groupsmember', $count, $user->getName() )->parse();
 478                         $grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
 479                 }
 480                 $count = count( $autoList );
 481                 if ( $count > 0 ) {
 482                         $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto', $count, $user->getName() )->parse();
 483                         $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
 484                 }
 485
 486                 $userToolLinks = Linker::userToolLinks(
 487                                 $user->getId(),
 488                                 $user->getName(),
 489                                 false, /* default for redContribsWhenNoEdits */
 490                                 Linker::TOOL_LINKS_EMAIL /* Add "send e-mail" link */
 491                 );
 492
 493                 $this->getOutput()->addHTML(
 494                         Xml::openElement( 'form', array( 'method' => 'post', 'action' => $this->getPageTitle()->getLocalURL(), 'name' => 'editGroup', 'id' => 'mw-userrights-form2' ) ) .
 495                         Html::hidden( 'user', $this->mTarget ) .
 496                         Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
 497                         Html::hidden( 'conflictcheck-originalgroups', implode( ',', $user->getGroups() ) ) . // Conflict detection
 498                         Xml::openElement( 'fieldset' ) .
 499                         Xml::element( 'legend', array(), $this->msg( 'userrights-editusergroup', $user->getName() )->text() ) .
 500                         $this->msg( 'editinguser' )->params( wfEscapeWikiText( $user->getName() ) )->rawParams( $userToolLinks )->parse() .
 501                         $this->msg( 'userrights-groups-help', $user->getName() )->parse() .
 502                         $grouplist .
 503                         Xml::tags( 'p', null, $this->groupCheckboxes( $groups, $user ) ) .
 504                         Xml::openElement( 'table', array( 'id' => 'mw-userrights-table-outer' ) ) .
 505                                 "<tr>
 506                                         <td class='mw-label'>" .
 507                                                 Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
 508                                         "</td>
 509                                         <td class='mw-input'>" .
 510                                                 Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason', false ),
 511                                                         array( 'id' => 'wpReason', 'maxlength' => 255 ) ) .
 512                                         "</td>
 513                                 </tr>
 514                                 <tr>
 515                                         <td></td>
 516                                         <td class='mw-submit'>" .
 517                                                 Xml::submitButton( $this->msg( 'saveusergroups' )->text(),
 518                                                         array( 'name' => 'saveusergroups' ) + Linker::tooltipAndAccesskeyAttribs( 'userrights-set' ) ) .
 519                                         "</td>
 520                                 </tr>" .
 521                         Xml::closeElement( 'table' ) . "\n" .
 522                         Xml::closeElement( 'fieldset' ) .
 523                         Xml::closeElement( 'form' ) . "\n"
 524                 );
 525         }
 526
 527         /**
 528          * Format a link to a group description page
 529          *
 530          * @param $group string
 531          * @return string
 532          */
 533         private static function buildGroupLink( $group ) {
 534                 return User::makeGroupLinkHtml( $group, User::getGroupName( $group ) );
 535         }
 536
 537         /**
 538          * Format a link to a group member description page
 539          *
 540          * @param $group string
 541          * @return string
 542          */
 543         private static function buildGroupMemberLink( $group ) {
 544                 return User::makeGroupLinkHtml( $group, User::getGroupMember( $group ) );
 545         }
 546
 547         /**
 548          * Returns an array of all groups that may be edited
 549          * @return array Array of groups that may be edited.
 550          */
 551         protected static function getAllGroups() {
 552                 return User::getAllGroups();
 553         }
 554
 555         /**
 556          * Adds a table with checkboxes where you can select what groups to add/remove
 557          *
 558          * @todo Just pass the username string?
 559          * @param array $usergroups groups the user belongs to
 560          * @param $user User a user object
 561          * @return string XHTML table element with checkboxes
 562          */
 563         private function groupCheckboxes( $usergroups, $user ) {
 564                 $allgroups = $this->getAllGroups();
 565                 $ret = '';
 566
 567                 // Put all column info into an associative array so that extensions can
 568                 // more easily manage it.
 569                 $columns = array( 'unchangeable' => array(), 'changeable' => array() );
 570
 571                 foreach ( $allgroups as $group ) {
 572                         $set = in_array( $group, $usergroups );
 573                         // Should the checkbox be disabled?
 574                         $disabled = !(
 575                                 ( $set && $this->canRemove( $group ) ) ||
 576                                 ( !$set && $this->canAdd( $group ) ) );
 577                         // Do we need to point out that this action is irreversible?
 578                         $irreversible = !$disabled && (
 579                                 ( $set && !$this->canAdd( $group ) ) ||
 580                                 ( !$set && !$this->canRemove( $group ) ) );
 581
 582                         $checkbox = array(
 583                                 'set' => $set,
 584                                 'disabled' => $disabled,
 585                                 'irreversible' => $irreversible
 586                         );
 587
 588                         if ( $disabled ) {
 589                                 $columns['unchangeable'][$group] = $checkbox;
 590                         } else {
 591                                 $columns['changeable'][$group] = $checkbox;
 592                         }
 593                 }
 594
 595                 // Build the HTML table
 596                 $ret .= Xml::openElement( 'table', array( 'class' => 'mw-userrights-groups' ) ) .
 597                         "<tr>\n";
 598                 foreach ( $columns as $name => $column ) {
 599                         if ( $column === array() ) {
 600                                 continue;
 601                         }
 602                         // Messages: userrights-changeable-col, userrights-unchangeable-col
 603                         $ret .= Xml::element( 'th', null, $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text() );
 604                 }
 605                 $ret .= "</tr>\n<tr>\n";
 606                 foreach ( $columns as $column ) {
 607                         if ( $column === array() ) {
 608                                 continue;
 609                         }
 610                         $ret .= "\t<td style='vertical-align:top;'>\n";
 611                         foreach ( $column as $group => $checkbox ) {
 612                                 $attr = $checkbox['disabled'] ? array( 'disabled' => 'disabled' ) : array();
 613
 614                                 $member = User::getGroupMember( $group, $user->getName() );
 615                                 if ( $checkbox['irreversible'] ) {
 616                                         $text = $this->msg( 'userrights-irreversible-marker', $member )->escaped();
 617                                 } else {
 618                                         $text = htmlspecialchars( $member );
 619                                 }
 620                                 $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
 621                                         "wpGroup-" . $group, $checkbox['set'], $attr );
 622                                 $ret .= "\t\t" . ( $checkbox['disabled']
 623                                         ? Xml::tags( 'span', array( 'class' => 'mw-userrights-disabled' ), $checkboxHtml )
 624                                         : $checkboxHtml
 625                                 ) . "<br />\n";
 626                         }
 627                         $ret .= "\t</td>\n";
 628                 }
 629                 $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 630
 631                 return $ret;
 632         }
 633
 634         /**
 635          * @param  $group String: the name of the group to check
 636          * @return bool Can we remove the group?
 637          */
 638         private function canRemove( $group ) {
 639                 // $this->changeableGroups()['remove'] doesn't work, of course. Thanks, PHP.
 640                 $groups = $this->changeableGroups();
 641                 return in_array( $group, $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] ) );
 642         }
 643
 644         /**
 645          * @param string $group the name of the group to check
 646          * @return bool Can we add the group?
 647          */
 648         private function canAdd( $group ) {
 649                 $groups = $this->changeableGroups();
 650                 return in_array( $group, $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] ) );
 651         }
 652
 653         /**
 654          * Returns $this->getUser()->changeableGroups()
 655          *
 656          * @return Array array( 'add' => array( addablegroups ), 'remove' => array( removablegroups ), 'add-self' => array( addablegroups to self ), 'remove-self' => array( removable groups from self ) )
 657          */
 658         function changeableGroups() {
 659                 return $this->getUser()->changeableGroups();
 660         }
 661
 662         /**
 663          * Show a rights log fragment for the specified user
 664          *
 665          * @param $user User to show log for
 666          * @param $output OutputPage to use
 667          */
 668         protected function showLogFragment( $user, $output ) {
 669                 $rightsLogPage = new LogPage( 'rights' );
 670                 $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
 671                 LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
 672         }
 673
 674         protected function getGroupName() {
 675                 return 'users';
 676         }
 677 }