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 string|null $par 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' )
 163                                 !== implode( ',', $targetUser->getGroups() )
 164                         ) {
 165                                 $out->addWikiMsg( 'userrights-conflict' );
 166                         } else {
 167                                 $this->saveUserGroups(
 168                                         $this->mTarget,
 169                                         $request->getVal( 'user-reason' ),
 170                                         $targetUser
 171                                 );
 172
 173                                 $out->redirect( $this->getSuccessURL() );
 174
 175                                 return;
 176                         }
 177                 }
 178
 179                 // show some more forms
 180                 if ( $this->mTarget !== null ) {
 181                         $this->editUserGroupsForm( $this->mTarget );
 182                 }
 183         }
 184
 185         function getSuccessURL() {
 186                 return $this->getPageTitle( $this->mTarget )->getFullURL( array( 'success' => 1 ) );
 187         }
 188
 189         /**
 190          * Save user groups changes in the database.
 191          * Data comes from the editUserGroupsForm() form function
 192          *
 193          * @param string $username Username to apply changes to.
 194          * @param string $reason Reason for group change
 195          * @param User|UserRightsProxy $user Target user object.
 196          * @return null
 197          */
 198         function saveUserGroups( $username, $reason, $user ) {
 199                 $allgroups = $this->getAllGroups();
 200                 $addgroup = array();
 201                 $removegroup = array();
 202
 203                 // This could possibly create a highly unlikely race condition if permissions are changed between
 204                 //  when the form is loaded and when the form is saved. Ignoring it for the moment.
 205                 foreach ( $allgroups as $group ) {
 206                         // We'll tell it to remove all unchecked groups, and add all checked groups.
 207                         // Later on, this gets filtered for what can actually be removed
 208                         if ( $this->getRequest()->getCheck( "wpGroup-$group" ) ) {
 209                                 $addgroup[] = $group;
 210                         } else {
 211                                 $removegroup[] = $group;
 212                         }
 213                 }
 214
 215                 $this->doSaveUserGroups( $user, $addgroup, $removegroup, $reason );
 216         }
 217
 218         /**
 219          * Save user groups changes in the database.
 220          *
 221          * @param User $user
 222          * @param array $add Array of groups to add
 223          * @param array $remove Array of groups to remove
 224          * @param string $reason Reason for group change
 225          * @return array Tuple of added, then removed groups
 226          */
 227         function doSaveUserGroups( $user, $add, $remove, $reason = '' ) {
 228                 global $wgAuth;
 229
 230                 // Validate input set...
 231                 $isself = ( $user->getName() == $this->getUser()->getName() );
 232                 $groups = $user->getGroups();
 233                 $changeable = $this->changeableGroups();
 234                 $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : array() );
 235                 $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : array() );
 236
 237                 $remove = array_unique(
 238                         array_intersect( (array)$remove, $removable, $groups ) );
 239                 $add = array_unique( array_diff(
 240                         array_intersect( (array)$add, $addable ),
 241                         $groups )
 242                 );
 243
 244                 $oldGroups = $user->getGroups();
 245                 $newGroups = $oldGroups;
 246
 247                 // remove then add groups
 248                 if ( $remove ) {
 249                         $newGroups = array_diff( $newGroups, $remove );
 250                         foreach ( $remove as $group ) {
 251                                 $user->removeGroup( $group );
 252                         }
 253                 }
 254                 if ( $add ) {
 255                         $newGroups = array_merge( $newGroups, $add );
 256                         foreach ( $add as $group ) {
 257                                 $user->addGroup( $group );
 258                         }
 259                 }
 260                 $newGroups = array_unique( $newGroups );
 261
 262                 // Ensure that caches are cleared
 263                 $user->invalidateCache();
 264
 265                 // update groups in external authentication database
 266                 $wgAuth->updateExternalDBGroups( $user, $add, $remove );
 267
 268                 wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) . "\n" );
 269                 wfDebug( 'newGroups: ' . print_r( $newGroups, true ) . "\n" );
 270                 wfRunHooks( 'UserRights', array( &$user, $add, $remove ) );
 271
 272                 if ( $newGroups != $oldGroups ) {
 273                         $this->addLogEntry( $user, $oldGroups, $newGroups, $reason );
 274                 }
 275
 276                 return array( $add, $remove );
 277         }
 278
 279         /**
 280          * Add a rights log entry for an action.
 281          * @param User $user
 282          * @param array $oldGroups
 283          * @param array $newGroups
 284          * @param array $reason
 285          */
 286         function addLogEntry( $user, $oldGroups, $newGroups, $reason ) {
 287                 $logEntry = new ManualLogEntry( 'rights', 'rights' );
 288                 $logEntry->setPerformer( $this->getUser() );
 289                 $logEntry->setTarget( $user->getUserPage() );
 290                 $logEntry->setComment( $reason );
 291                 $logEntry->setParameters( array(
 292                         '4::oldgroups' => $oldGroups,
 293                         '5::newgroups' => $newGroups,
 294                 ) );
 295                 $logid = $logEntry->insert();
 296                 $logEntry->publish( $logid );
 297         }
 298
 299         /**
 300          * Edit user groups membership
 301          * @param string $username Name of the user.
 302          */
 303         function editUserGroupsForm( $username ) {
 304                 $status = $this->fetchUser( $username );
 305                 if ( !$status->isOK() ) {
 306                         $this->getOutput()->addWikiText( $status->getWikiText() );
 307
 308                         return;
 309                 } else {
 310                         $user = $status->value;
 311                 }
 312
 313                 $groups = $user->getGroups();
 314
 315                 $this->showEditUserGroupsForm( $user, $groups );
 316
 317                 // This isn't really ideal logging behavior, but let's not hide the
 318                 // interwiki logs if we're using them as is.
 319                 $this->showLogFragment( $user, $this->getOutput() );
 320         }
 321
 322         /**
 323          * Normalize the input username, which may be local or remote, and
 324          * return a user (or proxy) object for manipulating it.
 325          *
 326          * Side effects: error output for invalid access
 327          * @param string $username
 328          * @return Status
 329          */
 330         public function fetchUser( $username ) {
 331                 $parts = explode( $this->getConfig()->get( 'UserrightsInterwikiDelimiter' ), $username );
 332                 if ( count( $parts ) < 2 ) {
 333                         $name = trim( $username );
 334                         $database = '';
 335                 } else {
 336                         list( $name, $database ) = array_map( 'trim', $parts );
 337
 338                         if ( $database == wfWikiID() ) {
 339                                 $database = '';
 340                         } else {
 341                                 if ( !$this->getUser()->isAllowed( 'userrights-interwiki' ) ) {
 342                                         return Status::newFatal( 'userrights-no-interwiki' );
 343                                 }
 344                                 if ( !UserRightsProxy::validDatabase( $database ) ) {
 345                                         return Status::newFatal( 'userrights-nodatabase', $database );
 346                                 }
 347                         }
 348                 }
 349
 350                 if ( $name === '' ) {
 351                         return Status::newFatal( 'nouserspecified' );
 352                 }
 353
 354                 if ( $name[0] == '#' ) {
 355                         // Numeric ID can be specified...
 356                         // We'll do a lookup for the name internally.
 357                         $id = intval( substr( $name, 1 ) );
 358
 359                         if ( $database == '' ) {
 360                                 $name = User::whoIs( $id );
 361                         } else {
 362                                 $name = UserRightsProxy::whoIs( $database, $id );
 363                         }
 364
 365                         if ( !$name ) {
 366                                 return Status::newFatal( 'noname' );
 367                         }
 368                 } else {
 369                         $name = User::getCanonicalName( $name );
 370                         if ( $name === false ) {
 371                                 // invalid name
 372                                 return Status::newFatal( 'nosuchusershort', $username );
 373                         }
 374                 }
 375
 376                 if ( $database == '' ) {
 377                         $user = User::newFromName( $name );
 378                 } else {
 379                         $user = UserRightsProxy::newFromName( $database, $name );
 380                 }
 381
 382                 if ( !$user || $user->isAnon() ) {
 383                         return Status::newFatal( 'nosuchusershort', $username );
 384                 }
 385
 386                 return Status::newGood( $user );
 387         }
 388
 389         function makeGroupNameList( $ids ) {
 390                 if ( empty( $ids ) ) {
 391                         return $this->msg( 'rightsnone' )->inContentLanguage()->text();
 392                 } else {
 393                         return implode( ', ', $ids );
 394                 }
 395         }
 396
 397         /**
 398          * Make a list of group names to be stored as parameter for log entries
 399          *
 400          * @deprecated since 1.21; use LogFormatter instead.
 401          * @param array $ids
 402          * @return string
 403          */
 404         function makeGroupNameListForLog( $ids ) {
 405                 wfDeprecated( __METHOD__, '1.21' );
 406
 407                 if ( empty( $ids ) ) {
 408                         return '';
 409                 } else {
 410                         return $this->makeGroupNameList( $ids );
 411                 }
 412         }
 413
 414         /**
 415          * Output a form to allow searching for a user
 416          */
 417         function switchForm() {
 418                 $this->getOutput()->addHTML(
 419                         Html::openElement(
 420                                 'form',
 421                                 array(
 422                                         'method' => 'get',
 423                                         'action' => wfScript(),
 424                                         'name' => 'uluser',
 425                                         'id' => 'mw-userrights-form1'
 426                                 )
 427                         ) .
 428                         Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
 429                         Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
 430                         Xml::inputLabel(
 431                                 $this->msg( 'userrights-user-editname' )->text(),
 432                                 'user',
 433                                 'username',
 434                                 30,
 435                                 str_replace( '_', ' ', $this->mTarget ),
 436                                 array( 'autofocus' => true )
 437                         ) . ' ' .
 438                         Xml::submitButton( $this->msg( 'editusergroup' )->text() ) .
 439                         Html::closeElement( 'fieldset' ) .
 440                         Html::closeElement( 'form' ) . "\n"
 441                 );
 442         }
 443
 444         /**
 445          * Go through used and available groups and return the ones that this
 446          * form will be able to manipulate based on the current user's system
 447          * permissions.
 448          *
 449          * @param array $groups List of groups the given user is in
 450          * @return array Tuple of addable, then removable groups
 451          */
 452         protected function splitGroups( $groups ) {
 453                 list( $addable, $removable, $addself, $removeself ) = array_values( $this->changeableGroups() );
 454
 455                 $removable = array_intersect(
 456                         array_merge( $this->isself ? $removeself : array(), $removable ),
 457                         $groups
 458                 ); // Can't remove groups the user doesn't have
 459                 $addable = array_diff(
 460                         array_merge( $this->isself ? $addself : array(), $addable ),
 461                         $groups
 462                 ); // Can't add groups the user does have
 463
 464                 return array( $addable, $removable );
 465         }
 466
 467         /**
 468          * Show the form to edit group memberships.
 469          *
 470          * @param User|UserRightsProxy $user User or UserRightsProxy you're editing
 471          * @param array $groups Array of groups the user is in
 472          */
 473         protected function showEditUserGroupsForm( $user, $groups ) {
 474                 $list = array();
 475                 $membersList = array();
 476                 foreach ( $groups as $group ) {
 477                         $list[] = self::buildGroupLink( $group );
 478                         $membersList[] = self::buildGroupMemberLink( $group );
 479                 }
 480
 481                 $autoList = array();
 482                 $autoMembersList = array();
 483                 if ( $user instanceof User ) {
 484                         foreach ( Autopromote::getAutopromoteGroups( $user ) as $group ) {
 485                                 $autoList[] = self::buildGroupLink( $group );
 486                                 $autoMembersList[] = self::buildGroupMemberLink( $group );
 487                         }
 488                 }
 489
 490                 $language = $this->getLanguage();
 491                 $displayedList = $this->msg( 'userrights-groupsmember-type',
 492                         $language->listToText( $list ),
 493                         $language->listToText( $membersList )
 494                 )->plain();
 495                 $displayedAutolist = $this->msg( 'userrights-groupsmember-type',
 496                         $language->listToText( $autoList ),
 497                         $language->listToText( $autoMembersList )
 498                 )->plain();
 499
 500                 $grouplist = '';
 501                 $count = count( $list );
 502                 if ( $count > 0 ) {
 503                         $grouplist = $this->msg( 'userrights-groupsmember', $count, $user->getName() )->parse();
 504                         $grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
 505                 }
 506
 507                 $count = count( $autoList );
 508                 if ( $count > 0 ) {
 509                         $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto', $count, $user->getName() )
 510                                 ->parse();
 511                         $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
 512                 }
 513
 514                 $userToolLinks = Linker::userToolLinks(
 515                         $user->getId(),
 516                         $user->getName(),
 517                         false, /* default for redContribsWhenNoEdits */
 518                         Linker::TOOL_LINKS_EMAIL /* Add "send e-mail" link */
 519                 );
 520
 521                 $this->getOutput()->addHTML(
 522                         Xml::openElement(
 523                                 'form',
 524                                 array(
 525                                         'method' => 'post',
 526                                         'action' => $this->getPageTitle()->getLocalURL(),
 527                                         'name' => 'editGroup',
 528                                         'id' => 'mw-userrights-form2'
 529                                 )
 530                         ) .
 531                         Html::hidden( 'user', $this->mTarget ) .
 532                         Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
 533                         Html::hidden(
 534                                 'conflictcheck-originalgroups',
 535                                 implode( ',', $user->getGroups() )
 536                         ) . // Conflict detection
 537                         Xml::openElement( 'fieldset' ) .
 538                         Xml::element(
 539                                 'legend',
 540                                 array(),
 541                                 $this->msg( 'userrights-editusergroup', $user->getName() )->text()
 542                         ) .
 543                         $this->msg( 'editinguser' )->params( wfEscapeWikiText( $user->getName() ) )
 544                                 ->rawParams( $userToolLinks )->parse() .
 545                         $this->msg( 'userrights-groups-help', $user->getName() )->parse() .
 546                         $grouplist .
 547                         $this->groupCheckboxes( $groups, $user ) .
 548                         Xml::openElement( 'table', array( 'id' => 'mw-userrights-table-outer' ) ) .
 549                                 "<tr>
 550                                         <td class='mw-label'>" .
 551                                                 Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
 552                                         "</td>
 553                                         <td class='mw-input'>" .
 554                                                 Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason', false ),
 555                                                         array( 'id' => 'wpReason', 'maxlength' => 255 ) ) .
 556                                         "</td>
 557                                 </tr>
 558                                 <tr>
 559                                         <td></td>
 560                                         <td class='mw-submit'>" .
 561                                                 Xml::submitButton( $this->msg( 'saveusergroups' )->text(),
 562                                                         array( 'name' => 'saveusergroups' ) +
 563                                                                 Linker::tooltipAndAccesskeyAttribs( 'userrights-set' )
 564                                                 ) .
 565                                         "</td>
 566                                 </tr>" .
 567                         Xml::closeElement( 'table' ) . "\n" .
 568                         Xml::closeElement( 'fieldset' ) .
 569                         Xml::closeElement( 'form' ) . "\n"
 570                 );
 571         }
 572
 573         /**
 574          * Format a link to a group description page
 575          *
 576          * @param string $group
 577          * @return string
 578          */
 579         private static function buildGroupLink( $group ) {
 580                 return User::makeGroupLinkHtml( $group, User::getGroupName( $group ) );
 581         }
 582
 583         /**
 584          * Format a link to a group member description page
 585          *
 586          * @param string $group
 587          * @return string
 588          */
 589         private static function buildGroupMemberLink( $group ) {
 590                 return User::makeGroupLinkHtml( $group, User::getGroupMember( $group ) );
 591         }
 592
 593         /**
 594          * Returns an array of all groups that may be edited
 595          * @return array Array of groups that may be edited.
 596          */
 597         protected static function getAllGroups() {
 598                 return User::getAllGroups();
 599         }
 600
 601         /**
 602          * Adds a table with checkboxes where you can select what groups to add/remove
 603          *
 604          * @todo Just pass the username string?
 605          * @param array $usergroups Groups the user belongs to
 606          * @param User $user
 607          * @return string XHTML table element with checkboxes
 608          */
 609         private function groupCheckboxes( $usergroups, $user ) {
 610                 $allgroups = $this->getAllGroups();
 611                 $ret = '';
 612
 613                 // Put all column info into an associative array so that extensions can
 614                 // more easily manage it.
 615                 $columns = array( 'unchangeable' => array(), 'changeable' => array() );
 616
 617                 foreach ( $allgroups as $group ) {
 618                         $set = in_array( $group, $usergroups );
 619                         // Should the checkbox be disabled?
 620                         $disabled = !(
 621                                 ( $set && $this->canRemove( $group ) ) ||
 622                                 ( !$set && $this->canAdd( $group ) ) );
 623                         // Do we need to point out that this action is irreversible?
 624                         $irreversible = !$disabled && (
 625                                 ( $set && !$this->canAdd( $group ) ) ||
 626                                 ( !$set && !$this->canRemove( $group ) ) );
 627
 628                         $checkbox = array(
 629                                 'set' => $set,
 630                                 'disabled' => $disabled,
 631                                 'irreversible' => $irreversible
 632                         );
 633
 634                         if ( $disabled ) {
 635                                 $columns['unchangeable'][$group] = $checkbox;
 636                         } else {
 637                                 $columns['changeable'][$group] = $checkbox;
 638                         }
 639                 }
 640
 641                 // Build the HTML table
 642                 $ret .= Xml::openElement( 'table', array( 'class' => 'mw-userrights-groups' ) ) .
 643                         "<tr>\n";
 644                 foreach ( $columns as $name => $column ) {
 645                         if ( $column === array() ) {
 646                                 continue;
 647                         }
 648                         // Messages: userrights-changeable-col, userrights-unchangeable-col
 649                         $ret .= Xml::element(
 650                                 'th',
 651                                 null,
 652                                 $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text()
 653                         );
 654                 }
 655
 656                 $ret .= "</tr>\n<tr>\n";
 657                 foreach ( $columns as $column ) {
 658                         if ( $column === array() ) {
 659                                 continue;
 660                         }
 661                         $ret .= "\t<td style='vertical-align:top;'>\n";
 662                         foreach ( $column as $group => $checkbox ) {
 663                                 $attr = $checkbox['disabled'] ? array( 'disabled' => 'disabled' ) : array();
 664
 665                                 $member = User::getGroupMember( $group, $user->getName() );
 666                                 if ( $checkbox['irreversible'] ) {
 667                                         $text = $this->msg( 'userrights-irreversible-marker', $member )->escaped();
 668                                 } else {
 669                                         $text = htmlspecialchars( $member );
 670                                 }
 671                                 $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
 672                                         "wpGroup-" . $group, $checkbox['set'], $attr );
 673                                 $ret .= "\t\t" . ( $checkbox['disabled']
 674                                         ? Xml::tags( 'span', array( 'class' => 'mw-userrights-disabled' ), $checkboxHtml )
 675                                         : $checkboxHtml
 676                                 ) . "<br />\n";
 677                         }
 678                         $ret .= "\t</td>\n";
 679                 }
 680                 $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 681
 682                 return $ret;
 683         }
 684
 685         /**
 686          * @param string $group The name of the group to check
 687          * @return bool Can we remove the group?
 688          */
 689         private function canRemove( $group ) {
 690                 // $this->changeableGroups()['remove'] doesn't work, of course. Thanks, PHP.
 691                 $groups = $this->changeableGroups();
 692
 693                 return in_array(
 694                         $group,
 695                         $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] )
 696                 );
 697         }
 698
 699         /**
 700          * @param string $group The name of the group to check
 701          * @return bool Can we add the group?
 702          */
 703         private function canAdd( $group ) {
 704                 $groups = $this->changeableGroups();
 705
 706                 return in_array(
 707                         $group,
 708                         $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] )
 709                 );
 710         }
 711
 712         /**
 713          * Returns $this->getUser()->changeableGroups()
 714          *
 715          * @return array Array(
 716          *   'add' => array( addablegroups ),
 717          *   'remove' => array( removablegroups ),
 718          *   'add-self' => array( addablegroups to self ),
 719          *   'remove-self' => array( removable groups from self )
 720          *  )
 721          */
 722         function changeableGroups() {
 723                 return $this->getUser()->changeableGroups();
 724         }
 725
 726         /**
 727          * Show a rights log fragment for the specified user
 728          *
 729          * @param User $user User to show log for
 730          * @param OutputPage $output OutputPage to use
 731          */
 732         protected function showLogFragment( $user, $output ) {
 733                 $rightsLogPage = new LogPage( 'rights' );
 734                 $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
 735                 LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
 736         }
 737
 738         protected function getGroupName() {
 739                 return 'users';
 740         }
 741 }