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
  59                 return !empty( $available['add'] )
  60                         || !empty( $available['remove'] )
  61                         || ( ( $this->isself || !$checkIfSelf ) &&
  62                                 ( !empty( $available['add-self'] )
  63                                         || !empty( $available['remove-self'] ) ) );
  64         }
  65
  66         /**
  67          * Manage forms to be shown according to posted data.
  68          * Depending on the submit button used, call a form or a save function.
  69          *
  70          * @param $par Mixed: string if any subpage provided, else null
  71          * @throws UserBlockedError|PermissionsError
  72          */
  73         public function execute( $par ) {
  74                 // If the visitor doesn't have permissions to assign or remove
  75                 // any groups, it's a bit silly to give them the user search prompt.
  76
  77                 $user = $this->getUser();
  78
  79                 /*
  80                  * If the user is blocked and they only have "partial" access
  81                  * (e.g. they don't have the userrights permission), then don't
  82                  * allow them to use Special:UserRights.
  83                  */
  84                 if ( $user->isBlocked() && !$user->isAllowed( 'userrights' ) ) {
  85                         throw new UserBlockedError( $user->getBlock() );
  86                 }
  87
  88                 $request = $this->getRequest();
  89
  90                 if ( $par !== null ) {
  91                         $this->mTarget = $par;
  92                 } else {
  93                         $this->mTarget = $request->getVal( 'user' );
  94                 }
  95
  96                 $available = $this->changeableGroups();
  97
  98                 if ( $this->mTarget === null ) {
  99                         /*
 100                          * If the user specified no target, and they can only
 101                          * edit their own groups, automatically set them as the
 102                          * target.
 103                          */
 104                         if ( !count( $available['add'] ) && !count( $available['remove'] ) ) {
 105                                 $this->mTarget = $user->getName();
 106                         }
 107                 }
 108
 109                 if ( User::getCanonicalName( $this->mTarget ) == $user->getName() ) {
 110                         $this->isself = true;
 111                 }
 112
 113                 if ( !$this->userCanChangeRights( $user, true ) ) {
 114                         if ( $this->isself && $request->getCheck( 'success' ) ) {
 115                                 // bug 48609: if the user just removed its own rights, this would
 116                                 // leads it in a "permissions error" page. In that case, show a
 117                                 // message that it can't anymore use this page instead of an error
 118                                 $this->setHeaders();
 119                                 $out = $this->getOutput();
 120                                 $out->wrapWikiMsg( "<div class=\"successbox\">\n$1\n</div>", 'userrights-removed-self' );
 121                                 $out->returnToMain();
 122
 123                                 return;
 124                         }
 125
 126                         // @todo FIXME: There may be intermediate groups we can mention.
 127                         $msg = $user->isAnon() ? 'userrights-nologin' : 'userrights-notallowed';
 128                         throw new PermissionsError( null, array( array( $msg ) ) );
 129                 }
 130
 131                 $this->checkReadOnly();
 132
 133                 $this->setHeaders();
 134                 $this->outputHeader();
 135
 136                 $out = $this->getOutput();
 137                 $out->addModuleStyles( 'mediawiki.special' );
 138
 139                 // show the general form
 140                 if ( count( $available['add'] ) || count( $available['remove'] ) ) {
 141                         $this->switchForm();
 142                 }
 143
 144                 if (
 145                         $request->wasPosted() &&
 146                         $request->getCheck( 'saveusergroups' ) &&
 147                         $user->matchEditToken( $request->getVal( 'wpEditToken' ), $this->mTarget )
 148                 ) {
 149                         // save settings
 150                         $status = $this->fetchUser( $this->mTarget );
 151                         if ( !$status->isOK() ) {
 152                                 $this->getOutput()->addWikiText( $status->getWikiText() );
 153
 154                                 return;
 155                         }
 156
 157                         $targetUser = $status->value;
 158                         if ( $targetUser instanceof User ) { // UserRightsProxy doesn't have this method (bug 61252)
 159                                 $targetUser->clearInstanceCache(); // bug 38989
 160                         }
 161
 162                         if ( $request->getVal( 'conflictcheck-originalgroups' ) !== implode( ',', $targetUser->getGroups() ) ) {
 163                                 $out->addWikiMsg( 'userrights-conflict' );
 164                         } else {
 165                                 $this->saveUserGroups(
 166                                         $this->mTarget,
 167                                         $request->getVal( 'user-reason' ),
 168                                         $targetUser
 169                                 );
 170
 171                                 $out->redirect( $this->getSuccessURL() );
 172
 173                                 return;
 174                         }
 175                 }
 176
 177                 // show some more forms
 178                 if ( $this->mTarget !== null ) {
 179                         $this->editUserGroupsForm( $this->mTarget );
 180                 }
 181         }
 182
 183         function getSuccessURL() {
 184                 return $this->getPageTitle( $this->mTarget )->getFullURL( array( 'success' => 1 ) );
 185         }
 186
 187         /**
 188          * Save user groups changes in the database.
 189          * Data comes from the editUserGroupsForm() form function
 190          *
 191          * @param string $username username to apply changes to.
 192          * @param string $reason reason for group change
 193          * @param User|UserRightsProxy $user Target user object.
 194          * @return null
 195          */
 196         function saveUserGroups( $username, $reason, $user ) {
 197                 $allgroups = $this->getAllGroups();
 198                 $addgroup = array();
 199                 $removegroup = array();
 200
 201                 // This could possibly create a highly unlikely race condition if permissions are changed between
 202                 //  when the form is loaded and when the form is saved. Ignoring it for the moment.
 203                 foreach ( $allgroups as $group ) {
 204                         // We'll tell it to remove all unchecked groups, and add all checked groups.
 205                         // Later on, this gets filtered for what can actually be removed
 206                         if ( $this->getRequest()->getCheck( "wpGroup-$group" ) ) {
 207                                 $addgroup[] = $group;
 208                         } else {
 209                                 $removegroup[] = $group;
 210                         }
 211                 }
 212
 213                 $this->doSaveUserGroups( $user, $addgroup, $removegroup, $reason );
 214         }
 215
 216         /**
 217          * Save user groups changes in the database.
 218          *
 219          * @param $user User object
 220          * @param array $add of groups to add
 221          * @param array $remove of groups to remove
 222          * @param string $reason reason for group change
 223          * @return Array: Tuple of added, then removed groups
 224          */
 225         function doSaveUserGroups( $user, $add, $remove, $reason = '' ) {
 226                 global $wgAuth;
 227
 228                 // Validate input set...
 229                 $isself = ( $user->getName() == $this->getUser()->getName() );
 230                 $groups = $user->getGroups();
 231                 $changeable = $this->changeableGroups();
 232                 $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : array() );
 233                 $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : array() );
 234
 235                 $remove = array_unique(
 236                         array_intersect( (array)$remove, $removable, $groups ) );
 237                 $add = array_unique( array_diff(
 238                         array_intersect( (array)$add, $addable ),
 239                         $groups )
 240                 );
 241
 242                 $oldGroups = $user->getGroups();
 243                 $newGroups = $oldGroups;
 244
 245                 // remove then add groups
 246                 if ( $remove ) {
 247                         $newGroups = array_diff( $newGroups, $remove );
 248                         foreach ( $remove as $group ) {
 249                                 $user->removeGroup( $group );
 250                         }
 251                 }
 252                 if ( $add ) {
 253                         $newGroups = array_merge( $newGroups, $add );
 254                         foreach ( $add as $group ) {
 255                                 $user->addGroup( $group );
 256                         }
 257                 }
 258                 $newGroups = array_unique( $newGroups );
 259
 260                 // Ensure that caches are cleared
 261                 $user->invalidateCache();
 262
 263                 // update groups in external authentication database
 264                 $wgAuth->updateExternalDBGroups( $user, $add, $remove );
 265
 266                 wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) );
 267                 wfDebug( 'newGroups: ' . print_r( $newGroups, true ) );
 268                 wfRunHooks( 'UserRights', array( &$user, $add, $remove ) );
 269
 270                 if ( $newGroups != $oldGroups ) {
 271                         $this->addLogEntry( $user, $oldGroups, $newGroups, $reason );
 272                 }
 273
 274                 return array( $add, $remove );
 275         }
 276
 277         /**
 278          * Add a rights log entry for an action.
 279          */
 280         function addLogEntry( $user, $oldGroups, $newGroups, $reason ) {
 281                 $logEntry = new ManualLogEntry( 'rights', 'rights' );
 282                 $logEntry->setPerformer( $this->getUser() );
 283                 $logEntry->setTarget( $user->getUserPage() );
 284                 $logEntry->setComment( $reason );
 285                 $logEntry->setParameters( array(
 286                         '4::oldgroups' => $oldGroups,
 287                         '5::newgroups' => $newGroups,
 288                 ) );
 289                 $logid = $logEntry->insert();
 290                 $logEntry->publish( $logid );
 291         }
 292
 293         /**
 294          * Edit user groups membership
 295          * @param string $username name of the user.
 296          */
 297         function editUserGroupsForm( $username ) {
 298                 $status = $this->fetchUser( $username );
 299                 if ( !$status->isOK() ) {
 300                         $this->getOutput()->addWikiText( $status->getWikiText() );
 301
 302                         return;
 303                 } else {
 304                         $user = $status->value;
 305                 }
 306
 307                 $groups = $user->getGroups();
 308
 309                 $this->showEditUserGroupsForm( $user, $groups );
 310
 311                 // This isn't really ideal logging behavior, but let's not hide the
 312                 // interwiki logs if we're using them as is.
 313                 $this->showLogFragment( $user, $this->getOutput() );
 314         }
 315
 316         /**
 317          * Normalize the input username, which may be local or remote, and
 318          * return a user (or proxy) object for manipulating it.
 319          *
 320          * Side effects: error output for invalid access
 321          * @param string $username
 322          * @return Status object
 323          */
 324         public function fetchUser( $username ) {
 325                 global $wgUserrightsInterwikiDelimiter;
 326
 327                 $parts = explode( $wgUserrightsInterwikiDelimiter, $username );
 328                 if ( count( $parts ) < 2 ) {
 329                         $name = trim( $username );
 330                         $database = '';
 331                 } else {
 332                         list( $name, $database ) = array_map( 'trim', $parts );
 333
 334                         if ( $database == wfWikiID() ) {
 335                                 $database = '';
 336                         } else {
 337                                 if ( !$this->getUser()->isAllowed( 'userrights-interwiki' ) ) {
 338                                         return Status::newFatal( 'userrights-no-interwiki' );
 339                                 }
 340                                 if ( !UserRightsProxy::validDatabase( $database ) ) {
 341                                         return Status::newFatal( 'userrights-nodatabase', $database );
 342                                 }
 343                         }
 344                 }
 345
 346                 if ( $name === '' ) {
 347                         return Status::newFatal( 'nouserspecified' );
 348                 }
 349
 350                 if ( $name[0] == '#' ) {
 351                         // Numeric ID can be specified...
 352                         // We'll do a lookup for the name internally.
 353                         $id = intval( substr( $name, 1 ) );
 354
 355                         if ( $database == '' ) {
 356                                 $name = User::whoIs( $id );
 357                         } else {
 358                                 $name = UserRightsProxy::whoIs( $database, $id );
 359                         }
 360
 361                         if ( !$name ) {
 362                                 return Status::newFatal( 'noname' );
 363                         }
 364                 } else {
 365                         $name = User::getCanonicalName( $name );
 366                         if ( $name === false ) {
 367                                 // invalid name
 368                                 return Status::newFatal( 'nosuchusershort', $username );
 369                         }
 370                 }
 371
 372                 if ( $database == '' ) {
 373                         $user = User::newFromName( $name );
 374                 } else {
 375                         $user = UserRightsProxy::newFromName( $database, $name );
 376                 }
 377
 378                 if ( !$user || $user->isAnon() ) {
 379                         return Status::newFatal( 'nosuchusershort', $username );
 380                 }
 381
 382                 return Status::newGood( $user );
 383         }
 384
 385         function makeGroupNameList( $ids ) {
 386                 if ( empty( $ids ) ) {
 387                         return $this->msg( 'rightsnone' )->inContentLanguage()->text();
 388                 } else {
 389                         return implode( ', ', $ids );
 390                 }
 391         }
 392
 393         /**
 394          * Make a list of group names to be stored as parameter for log entries
 395          *
 396          * @deprecated in 1.21; use LogFormatter instead.
 397          * @param $ids array
 398          * @return string
 399          */
 400         function makeGroupNameListForLog( $ids ) {
 401                 wfDeprecated( __METHOD__, '1.21' );
 402
 403                 if ( empty( $ids ) ) {
 404                         return '';
 405                 } else {
 406                         return $this->makeGroupNameList( $ids );
 407                 }
 408         }
 409
 410         /**
 411          * Output a form to allow searching for a user
 412          */
 413         function switchForm() {
 414                 global $wgScript;
 415                 $this->getOutput()->addHTML(
 416                         Html::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript, 'name' => 'uluser', 'id' => 'mw-userrights-form1' ) ) .
 417                         Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
 418                         Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
 419                         Xml::inputLabel( $this->msg( 'userrights-user-editname' )->text(), 'user', 'username', 30, str_replace( '_', ' ', $this->mTarget ), array( 'autofocus' => true ) ) . ' ' .
 420                         Xml::submitButton( $this->msg( 'editusergroup' )->text() ) .
 421                         Html::closeElement( 'fieldset' ) .
 422                         Html::closeElement( 'form' ) . "\n"
 423                 );
 424         }
 425
 426         /**
 427          * Go through used and available groups and return the ones that this
 428          * form will be able to manipulate based on the current user's system
 429          * permissions.
 430          *
 431          * @param array $groups list of groups the given user is in
 432          * @return Array:  Tuple of addable, then removable groups
 433          */
 434         protected function splitGroups( $groups ) {
 435                 list( $addable, $removable, $addself, $removeself ) = array_values( $this->changeableGroups() );
 436
 437                 $removable = array_intersect(
 438                         array_merge( $this->isself ? $removeself : array(), $removable ),
 439                         $groups
 440                 ); // Can't remove groups the user doesn't have
 441                 $addable = array_diff(
 442                         array_merge( $this->isself ? $addself : array(), $addable ),
 443                         $groups
 444                 ); // Can't add groups the user does have
 445
 446                 return array( $addable, $removable );
 447         }
 448
 449         /**
 450          * Show the form to edit group memberships.
 451          *
 452          * @param $user      User or UserRightsProxy you're editing
 453          * @param $groups    Array:  Array of groups the user is in
 454          */
 455         protected function showEditUserGroupsForm( $user, $groups ) {
 456                 $list = array();
 457                 $membersList = array();
 458                 foreach ( $groups as $group ) {
 459                         $list[] = self::buildGroupLink( $group );
 460                         $membersList[] = self::buildGroupMemberLink( $group );
 461                 }
 462
 463                 $autoList = array();
 464                 $autoMembersList = array();
 465                 if ( $user instanceof User ) {
 466                         foreach ( Autopromote::getAutopromoteGroups( $user ) as $group ) {
 467                                 $autoList[] = self::buildGroupLink( $group );
 468                                 $autoMembersList[] = self::buildGroupMemberLink( $group );
 469                         }
 470                 }
 471
 472                 $language = $this->getLanguage();
 473                 $displayedList = $this->msg( 'userrights-groupsmember-type',
 474                         $language->listToText( $list ),
 475                         $language->listToText( $membersList )
 476                 )->plain();
 477                 $displayedAutolist = $this->msg( 'userrights-groupsmember-type',
 478                         $language->listToText( $autoList ),
 479                         $language->listToText( $autoMembersList )
 480                 )->plain();
 481
 482                 $grouplist = '';
 483                 $count = count( $list );
 484                 if ( $count > 0 ) {
 485                         $grouplist = $this->msg( 'userrights-groupsmember', $count, $user->getName() )->parse();
 486                         $grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
 487                 }
 488                 $count = count( $autoList );
 489                 if ( $count > 0 ) {
 490                         $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto', $count, $user->getName() )->parse();
 491                         $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
 492                 }
 493
 494                 $userToolLinks = Linker::userToolLinks(
 495                         $user->getId(),
 496                         $user->getName(),
 497                         false, /* default for redContribsWhenNoEdits */
 498                         Linker::TOOL_LINKS_EMAIL /* Add "send e-mail" link */
 499                 );
 500
 501                 $this->getOutput()->addHTML(
 502                         Xml::openElement( 'form', array( 'method' => 'post', 'action' => $this->getPageTitle()->getLocalURL(), 'name' => 'editGroup', 'id' => 'mw-userrights-form2' ) ) .
 503                         Html::hidden( 'user', $this->mTarget ) .
 504                         Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
 505                         Html::hidden( 'conflictcheck-originalgroups', implode( ',', $user->getGroups() ) ) . // Conflict detection
 506                         Xml::openElement( 'fieldset' ) .
 507                         Xml::element( 'legend', array(), $this->msg( 'userrights-editusergroup', $user->getName() )->text() ) .
 508                         $this->msg( 'editinguser' )->params( wfEscapeWikiText( $user->getName() ) )->rawParams( $userToolLinks )->parse() .
 509                         $this->msg( 'userrights-groups-help', $user->getName() )->parse() .
 510                         $grouplist .
 511                         Xml::tags( 'p', null, $this->groupCheckboxes( $groups, $user ) ) .
 512                         Xml::openElement( 'table', array( 'id' => 'mw-userrights-table-outer' ) ) .
 513                                 "<tr>
 514                                         <td class='mw-label'>" .
 515                                                 Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
 516                                         "</td>
 517                                         <td class='mw-input'>" .
 518                                                 Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason', false ),
 519                                                         array( 'id' => 'wpReason', 'maxlength' => 255 ) ) .
 520                                         "</td>
 521                                 </tr>
 522                                 <tr>
 523                                         <td></td>
 524                                         <td class='mw-submit'>" .
 525                                                 Xml::submitButton( $this->msg( 'saveusergroups' )->text(),
 526                                                         array( 'name' => 'saveusergroups' ) + Linker::tooltipAndAccesskeyAttribs( 'userrights-set' ) ) .
 527                                         "</td>
 528                                 </tr>" .
 529                         Xml::closeElement( 'table' ) . "\n" .
 530                         Xml::closeElement( 'fieldset' ) .
 531                         Xml::closeElement( 'form' ) . "\n"
 532                 );
 533         }
 534
 535         /**
 536          * Format a link to a group description page
 537          *
 538          * @param $group string
 539          * @return string
 540          */
 541         private static function buildGroupLink( $group ) {
 542                 return User::makeGroupLinkHtml( $group, User::getGroupName( $group ) );
 543         }
 544
 545         /**
 546          * Format a link to a group member description page
 547          *
 548          * @param $group string
 549          * @return string
 550          */
 551         private static function buildGroupMemberLink( $group ) {
 552                 return User::makeGroupLinkHtml( $group, User::getGroupMember( $group ) );
 553         }
 554
 555         /**
 556          * Returns an array of all groups that may be edited
 557          * @return array Array of groups that may be edited.
 558          */
 559         protected static function getAllGroups() {
 560                 return User::getAllGroups();
 561         }
 562
 563         /**
 564          * Adds a table with checkboxes where you can select what groups to add/remove
 565          *
 566          * @todo Just pass the username string?
 567          * @param array $usergroups groups the user belongs to
 568          * @param $user User a user object
 569          * @return string XHTML table element with checkboxes
 570          */
 571         private function groupCheckboxes( $usergroups, $user ) {
 572                 $allgroups = $this->getAllGroups();
 573                 $ret = '';
 574
 575                 // Put all column info into an associative array so that extensions can
 576                 // more easily manage it.
 577                 $columns = array( 'unchangeable' => array(), 'changeable' => array() );
 578
 579                 foreach ( $allgroups as $group ) {
 580                         $set = in_array( $group, $usergroups );
 581                         // Should the checkbox be disabled?
 582                         $disabled = !(
 583                                 ( $set && $this->canRemove( $group ) ) ||
 584                                 ( !$set && $this->canAdd( $group ) ) );
 585                         // Do we need to point out that this action is irreversible?
 586                         $irreversible = !$disabled && (
 587                                 ( $set && !$this->canAdd( $group ) ) ||
 588                                 ( !$set && !$this->canRemove( $group ) ) );
 589
 590                         $checkbox = array(
 591                                 'set' => $set,
 592                                 'disabled' => $disabled,
 593                                 'irreversible' => $irreversible
 594                         );
 595
 596                         if ( $disabled ) {
 597                                 $columns['unchangeable'][$group] = $checkbox;
 598                         } else {
 599                                 $columns['changeable'][$group] = $checkbox;
 600                         }
 601                 }
 602
 603                 // Build the HTML table
 604                 $ret .= Xml::openElement( 'table', array( 'class' => 'mw-userrights-groups' ) ) .
 605                         "<tr>\n";
 606                 foreach ( $columns as $name => $column ) {
 607                         if ( $column === array() ) {
 608                                 continue;
 609                         }
 610                         // Messages: userrights-changeable-col, userrights-unchangeable-col
 611                         $ret .= Xml::element( 'th', null, $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text() );
 612                 }
 613                 $ret .= "</tr>\n<tr>\n";
 614                 foreach ( $columns as $column ) {
 615                         if ( $column === array() ) {
 616                                 continue;
 617                         }
 618                         $ret .= "\t<td style='vertical-align:top;'>\n";
 619                         foreach ( $column as $group => $checkbox ) {
 620                                 $attr = $checkbox['disabled'] ? array( 'disabled' => 'disabled' ) : array();
 621
 622                                 $member = User::getGroupMember( $group, $user->getName() );
 623                                 if ( $checkbox['irreversible'] ) {
 624                                         $text = $this->msg( 'userrights-irreversible-marker', $member )->escaped();
 625                                 } else {
 626                                         $text = htmlspecialchars( $member );
 627                                 }
 628                                 $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
 629                                         "wpGroup-" . $group, $checkbox['set'], $attr );
 630                                 $ret .= "\t\t" . ( $checkbox['disabled']
 631                                         ? Xml::tags( 'span', array( 'class' => 'mw-userrights-disabled' ), $checkboxHtml )
 632                                         : $checkboxHtml
 633                                 ) . "<br />\n";
 634                         }
 635                         $ret .= "\t</td>\n";
 636                 }
 637                 $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 638
 639                 return $ret;
 640         }
 641
 642         /**
 643          * @param  $group String: the name of the group to check
 644          * @return bool Can we remove the group?
 645          */
 646         private function canRemove( $group ) {
 647                 // $this->changeableGroups()['remove'] doesn't work, of course. Thanks, PHP.
 648                 $groups = $this->changeableGroups();
 649
 650                 return in_array( $group, $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] ) );
 651         }
 652
 653         /**
 654          * @param string $group the name of the group to check
 655          * @return bool Can we add the group?
 656          */
 657         private function canAdd( $group ) {
 658                 $groups = $this->changeableGroups();
 659
 660                 return in_array( $group, $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] ) );
 661         }
 662
 663         /**
 664          * Returns $this->getUser()->changeableGroups()
 665          *
 666          * @return Array array( 'add' => array( addablegroups ), 'remove' => array( removablegroups ), 'add-self' => array( addablegroups to self ), 'remove-self' => array( removable groups from self ) )
 667          */
 668         function changeableGroups() {
 669                 return $this->getUser()->changeableGroups();
 670         }
 671
 672         /**
 673          * Show a rights log fragment for the specified user
 674          *
 675          * @param $user User to show log for
 676          * @param $output OutputPage to use
 677          */
 678         protected function showLogFragment( $user, $output ) {
 679                 $rightsLogPage = new LogPage( 'rights' );
 680                 $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
 681                 LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
 682         }
 683
 684         protected function getGroupName() {
 685                 return 'users';
 686         }
 687 }